CN117696837A - Gate valve body production mould - Google Patents

Abstract

The invention relates to the field of valve body production, and discloses a gate valve body production die, which comprises an outer die part and an inner die part, wherein the outer die part comprises a front die and a rear die, a first cavity and a second cavity are respectively formed in half on the front die and the rear die, and a first opening, a second opening and a third opening which are communicated with the first cavity and the second cavity are respectively formed on the front die and the rear die; the internal mold part comprises a first mold core penetrating through the first opening, a second mold core penetrating through the second opening and a third mold core penetrating through the third opening, the first mold core and the second mold core are respectively attached to the third mold core, and a third cavity is formed by encircling the first mold core and the third mold core and encircling the second mold core and the third mold core respectively. The gate valve body production die has the advantages of relatively simple operation process and overall structure and low manufacturing difficulty; the valve body and the valve seat can be integrally formed in a casting mode, so that the production period is greatly shortened, the production cost is reduced, and the purpose of manufacturing the valve body by die forging is realized.

Description

Gate valve body production mould

Technical Field

The invention relates to the field of valve body production, in particular to a gate valve body production die.

Background

The gate valve is a valve using a gate plate as an opening and closing member, the moving direction of the gate plate is vertical to the direction of fluid, and threads of a valve rod are led to advance and retreat by rotating a hand wheel, so that the gate plate connected with the valve rod is lifted or lowered, and the opening and closing functions are achieved. The valve body and the valve seat are used as important components of the gate valve and cooperate with the gate plate to realize the functions of opening and sealing fluid.

The die forging is a casting method for obtaining the forging by molding the blank on special die forging equipment by utilizing a die, and the forging produced by the method has the advantages of accurate size, small machining allowance, high productivity, low cost, low operation and technical content and easy manufacture. For this purpose, various valve body structures are often produced by means of swaging. The wedge gate valve is used as one kind of gate valve, and in order to make the valve seat of gate valve and valve plate reach the effect of sealing and opening and closing the valve body, the valve seat of gate valve and the vertical central line of valve body form certain oblique angle for preventing the valve plate from being blocked when the temperature changes, this makes the clearance between valve seat and the inner wall of valve body. Therefore, the traditional manufacturing method is that after the valve seat and the valve body are manufactured and molded in a die forging mode and the like, the valve seat is fixedly connected in the inner cavity of the valve body in a welding or threaded mode, but the valve seat and the valve body are required to be manufactured separately and then are connected and fixed, the whole production process is complex and troublesome, the whole cost is high, and the production efficiency is low.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to solve the technical problems that: the gate valve body production die is used for solving the problems of high production and manufacturing cost and troublesome manufacturing of valve bodies and valve seats.

In order to solve the technical problems, the invention adopts a technical scheme that: the gate valve body production die comprises an outer die part and an inner die part, wherein the outer die part comprises a front die and a rear die which are mutually buckled and distributed, a first cavity and a second cavity which are buckled and used for forming the outer contour surface of a valve body are respectively formed in half on one side surface of the front die and one side surface of the rear die which are opposite to each other, so that after the front die and the rear die are mutually buckled and aligned, the first cavity and the second cavity are aligned and can be used for forming the complete outer contour surface of the valve body, and after casting, the outer contour surface of the valve body is manufactured; the front side die and the rear side die are respectively provided with a first opening, a second opening and a third opening which are communicated with the first cavity and the second cavity and can be used for injecting metal casting liquid at positions corresponding to an inlet, an outlet and a connecting port of the valve body; the positions of flange plates corresponding to the inlet and the outlet of the valve body on the front side die and the rear side die are respectively provided with a first mounting groove and a second mounting groove, a first annular movable block is adapted in the first mounting groove, a second annular movable block is adapted in the second mounting groove, the first annular movable block, the second annular movable block and the front side die are jointly enclosed to form a first cavity, and the first annular movable block, the second annular movable block and the rear side die are jointly enclosed to form a second cavity so as to facilitate demoulding; the valve body is characterized in that the inner mold part comprises a first mold core penetrating through the first opening and extending to the inner contour surface of the molding inlet in the first cavity and the second cavity, a second mold core penetrating through the second opening and extending to the inner contour surface of the molding outlet in the first cavity and the second cavity, and a third mold core penetrating through the third opening and extending to the inner contour surface of the molding connecting port and the valve chamber in the first cavity and the second cavity, one opposite sides of the first mold core and the second mold core are respectively attached to two sides of the third mold core, one opposite sides of the first mold core and the third mold core and one opposite side of the second mold core and the third mold core are respectively enclosed to form a third cavity for molding a valve seat and communicating the first cavity and the second cavity, so that the inner contour surface of the valve body and the inner contour surface of the valve seat can be integrally molded, the production cost and the inner contour surface of the valve seat are greatly reduced relative to the inner contour surface of the valve body which are respectively cast, and the gate valve body is completely manufactured through the cooperation between the first mold core, the second mold core and the third mold core, especially the first mold seat, the second mold core and the second mold core are matched with the first mold core and the valve chamber.

Further, the first cavity and the second cavity each comprise a first cavity section communicated with the first opening and used for forming the outer contour surface of the inlet, a second cavity section communicated with the second opening and used for forming the outer contour surface of the outlet, a third cavity section communicated with the third opening and used for forming the outer contour surface of the connecting port, and a fourth cavity section respectively communicated with the first cavity section, the second cavity section and the third cavity section and used for forming the outer contour surface of the valve, the first opening, the first cavity section, the second opening and the second cavity section are coaxially distributed, the first mold core penetrates into the first opening and the first cavity section, the second mold core penetrates into the second opening and the second cavity section, and the third mold core penetrates into the third opening, the third cavity section and the fourth cavity section, so that the cavity structure matched with the inner contour surface and the outer contour surface of the valve body are completed, and the integrally formed production of the valve body and the valve seat is completed.

Further, a first side plate is formed by dividing one side surface of the front side die and the rear side die, which is opposite to the first cavity section, the first side plate is respectively surrounded with the front side die and the rear side die to form the first cavity section, and the first opening is formed on the first side plate in a penetrating way; the front side die and the rear side die are just divided on one side surface of the second cavity section to form a second side plate, the second side plate is respectively surrounded with the front side die and the rear side die to form the second cavity section, and the second opening is formed on the second side plate in a penetrating way; the front side die and the rear side die are just divided on one side face of the third cavity section to form a top plate, the top plate is respectively encircled with the front side die and the rear side die to form the third cavity section, the third opening is formed on the top plate in a penetrating way, a casting cavity is concavely formed between the first side plate and the first annular movable block, between the second side plate and the second annular movable block and between the top plate and the rear side die, so that a casting cavity is formed at the first opening, the second opening and the third opening, metal casting liquid is injected into the cavity through the plurality of casting cavities, so that casting efficiency can be quickened, good fluidity in the cavity is ensured, the casting cavity can be quickly solidified, and the functions of preventing feeding back flow and preventing the cavity pressure from dropping too fast to enable a formed product to shrink.

Further, the first mold core, the third mold core and the second mold core are sequentially communicated with each other along the axial direction of the first cavity section by the first mold core to form a collinear pin hole, the inner mold part further comprises a pin shaft which sequentially penetrates through the pin holes of the first mold core, the third mold core and the second mold core, and two ends of the pin shaft are penetrated out of the outer mold part, so that the first mold core, the second mold core and the third mold core can be aligned rapidly when the mold is assembled, the installation speed is increased, the first mold core, the second mold core and the third mold core can be in a preset position and state, and the formed valve body and the valve seat inner contour face are guaranteed to meet the requirements.

Further, the first mold core comprises a first end plate, a first mold section, a second mold section and a third mold section, wherein the first end plate is positioned outside the first opening, the first mold section is blocked in the first opening, the second mold section is positioned in the first cavity section and is used for forming the inner contour surface of the inlet, the third mold section is positioned in the fourth cavity section and is used for forming the inner contour surface of one valve seat, so that the inner contour surface of the inlet is formed, and the inlet is formed in cooperation with the first cavity section.

Further, the second mold core comprises a second end plate, a fourth mold section, a fifth mold section and a sixth mold section, wherein the second end plate is positioned outside the second opening, the fourth mold section is blocked in the second opening, the fifth mold section is positioned in the second cavity section and is used for forming the inner contour surface of the outlet, and the sixth mold section is positioned in the fourth cavity section and is used for forming the inner contour surface of the other valve seat, so that the inner contour surface of the outlet and the inner contour surface of the valve seat are integrally formed, and the forming of the outlet is completed in cooperation with the second cavity section.

Further, the third mold core is provided with a connecting part which is positioned in the third cavity section and is used for forming the inner contour surface of the connecting port and a forming part which is positioned in the fourth cavity section and is used for forming the inner contour surface of the valve chamber, the forming part is positioned between the third mold section and the sixth mold section, the positions, facing the third mold section and the sixth mold section, of the forming part are respectively provided with a fifth cavity section which is used for forming the outer contour surface of the valve seat, the end parts of the third mold section and the sixth mold section are respectively attached to the inner walls of the two fifth cavity sections, and the two fifth cavity sections are respectively enclosed with the third mold section and the sixth mold section to form the third cavity.

Further, the third mold core comprises a third end plate, a seventh mold section, an eighth mold section and a ninth mold section, wherein the third end plate is positioned outside the third opening, the seventh mold section is blocked in the third opening, the eighth mold section is positioned in the third cavity section and is used for forming the inner contour surface of the connecting port, the ninth mold section is positioned in the fourth cavity section and is used for forming the inner contour surface of the valve chamber, the fifth mold section is respectively formed on two sides of the ninth mold section, the third end plate, the seventh mold section and the eighth mold section are limited to be the connecting parts, and the ninth mold section is limited to be the forming parts, so that the third mold core can directly finish the forming of the inner contour surfaces of the connecting port and the valve chamber.

Further, rib grooves for forming the profile surface of the rib on the inner profile surface of the connecting port are formed on both sides of the eighth die segment facing the third die segment and the sixth die segment, respectively, so as to be used for producing the rib.

Further, the side of the eighth mold section and the side of the ninth mold section facing the third mold section and the side of the eighth mold section facing the sixth mold section are respectively divided by a part of the rib groove close to the third end plate along the axial direction perpendicular to the eighth mold section and then are further divided towards the side far from the third opening to form a 7-shaped dividing surface, the two dividing surfaces gradually approach from the side close to the third opening to the side close to the fourth cavity section, and the two dividing surfaces divide the two sides of the eighth mold section and the ninth mold section into a first module positioned at the inner side and two second modules positioned at the outer side; the part of the ninth die section on the first module is divided from the eighth die section towards the side far away from the third end plate along the axial direction of the seventh die section on two sides of the two fourth cavities to form a first movable block which is convexly arranged towards the side far away from the first module and used for forming the inner contour surface of the partial valve chamber, so that the first module can be peeled along the axial direction of the seventh die section, and the demolding difficulty is reduced; the second module comprises a first sub-module formed by dividing an eighth module section and a second sub-module formed by dividing a ninth module section, and the fifth cavity section is formed on the second sub-module, so that the first module can be taken out firstly during demolding, a moving space is reserved for the first sub-module and the second sub-module for forming rib plates, and the second module can be smoothly demolded and taken out.

The gate valve body production die has at least the following beneficial effects: the first cavity and the second cavity are arranged on the outer mold part, after the front side mold and the rear side mold are buckled, the first cavity and the second cavity are mutually aligned and form a cavity matched with the outer contour surface of the valve body, and the front side mold and the rear side mold are mutually buckled, so that the operation process and the whole structure are relatively simple, and the manufacturing difficulty is low; the first mold core, the second mold core and the third mold core are matched with each other to form an inner contour surface of the valve body and an inner contour surface of the valve seat as an inner mold part, and the inner contour surface is assembled between the front side mold and the rear side mold through the first opening, the second opening and the third opening, so that a cavity which is formed by matching the inner contour surface and the outer contour surface of the valve body and the valve seat is enclosed together with the first cavity and the second cavity, the valve body and the valve seat are integrally formed in a casting mode, the production period is greatly shortened, and the production cost is reduced; meanwhile, the third mold core is matched with the first mold core and the second mold core to generate a connecting port and an inner contour surface of the valve chamber, gaps between the valve body and the valve seat are located in the valve chamber, the third mold core can be used for forming the valve chamber, generation between the valve body and the valve seat is guaranteed, and the purpose of manufacturing the valve body through die forging is achieved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

FIG. 1 is a schematic view of a gate valve body after casting molding in a mold according to the present invention;

FIG. 2 is a schematic structural view of a gate valve body production mold of the present invention;

FIG. 3 is an exploded view of a gate valve body production mold of the present invention;

FIG. 4 is a top view of a gate valve body production mold of the present invention;

FIG. 5 is a cross-sectional view of the present invention taken along the line A-A of FIG. 4;

FIG. 6 is a cross-sectional view taken along the B-B direction of the present invention;

FIG. 7 is a schematic view of the inner mold part of the present invention;

FIG. 8 is a schematic view of the first, second and third mold cores of the inner mold part of the present invention;

fig. 9 is an exploded view of the inner mold part of the present invention.

The meaning of the reference numerals in the drawings are:

an inlet-11; a valve chamber-12; an outlet-13; a connection port-14; rib plate-15; a valve seat-2;

an outer mold section-3; front side mold-31; rear side mold-32; a first cavity-33; a second cavity-34; a first chamber section-3 a; a second chamber section-3 b; a third chamber section-3 c; a fourth chamber section-3 d; a first opening-351; a second opening-352; a third opening-353; a first side plate-361; a second side plate-362; a top plate-363; casting cavity-364; a first mounting groove-371; a first annular loose piece-372; a second mounting groove-373; a second annular loose piece-374; fourth mounting groove-381; a second loose piece-382;

An inner mold part-4; a first mold core-41; a first end plate-411; a first mold segment-412; a second mold segment-413; a third mold segment-414; a second mold core-42; a second end plate-421; fourth mold segment-422; a fifth mold segment-423; sixth mold segment-424; a third mold core-43; a connection portion-43 a; a molding part-43 b; a third end plate-431; seventh mold segment-432; eighth mold segment-433; ninth mold segment-434; rib grooves-435; a dividing plane-436; a first module-437; a second module-438; a first sub-module-4381; second sub-module-4382; first loose piece-439; pin roll-44; a fifth chamber section-45;

casting nozzle-5;

and a third cavity-6.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of a gate valve body formed by die forging using the gate valve body production die of the present invention, and the model number is DN500-Z40H-16C. The gate valve body comprises a valve body and two valve seats 2, wherein the valve body comprises an inlet 11, a valve chamber 12 and an outlet 13 which are coaxially and sequentially communicated and distributed in sequence, and a connecting port 14, the axial direction of which is perpendicular to the axial direction of the inlet 11, the connecting port 14 is communicated with the valve chamber 12, the diameter of the middle part of the valve chamber 12 is larger than that of the inlet 11 and the outlet 13 so that the outer wall of the valve chamber 12 is annularly and convexly distributed along the circumference of the outer walls of the inlet 11 and the outlet 13 relative to the outer walls of the inlet 11 and the outlet 13. The two valve seats 2 are coaxially arranged at one ends of the inlet 11 and the outlet 13 near the valve chamber 12, and the inner diameter is equal to the inner diameter of the inlet 11 and the outlet 13. The outer wall of the valve housing 12 is provided around the outer wall of the valve seat 2 with a space therebetween. Two cross-shaped rib plates 15 are symmetrically distributed on the inner wall of the connecting port 14, the two rib plates 15 are in mirror image distribution relative to the two valve seats 2, one rib plate 15 is close to one side of the inlet 11, and the other rib plate 15 is close to one side of the outlet 13. Both ribs 15 are formed protruding in the axial direction of the inlet 11 and the outlet 13. A flange plate is provided on each of the inlet 11, the outlet 13 and the end of the connection port 14 remote from the valve chamber 12.

As shown in fig. 2 to 9, the gate valve body production mold of the present invention includes an outer mold portion 3 for forming the outer contour surface of the gate valve body and an inner mold portion 4 mounted on the outer mold portion 3 for forming the inner contour surface of the gate valve body, at least one casting port 5 is provided on the outer mold portion 3, a forming cavity corresponding to the outer contour surface of the gate valve body is formed in the outer mold portion 3, the inner mold portion 4 is mounted in the forming cavity and encloses with the forming cavity together to form a cavity corresponding to the inner contour surface and the outer contour surface of the gate valve body, the casting port 5 is communicated with the forming cavity to communicate with the cavity, after the cavity is filled with a metal casting liquid, after the metal casting liquid in the cavity is cooled and formed, the inner mold portion 4 and the outer mold portion 3 are respectively peeled off from the formed gate valve body, thereby completing the production of the gate valve body, and the whole mold can be reused, and the cost is lower compared with other production modes.

As shown in fig. 2 and 3, the outer mold part 3 includes a front mold 31 and a rear mold 32 which are mutually buckled and distributed, and the front mold 31 and the rear mold 32 are both square structures and are symmetrical. A second cavity 34 is formed on a side of the front mold 31 facing the rear mold 32, and a second cavity 34 is formed on a side of the rear mold 32 facing the front mold 31 in mirror image distribution with the first cavity 33 so as to be symmetrical. The profile of the first cavity 33 is matched with the outer profile surface of one half of the gate valve body, the profile of the second cavity 34 is matched with the outer profile surface of the other half of the gate valve body, so that the first cavity 33 and the second cavity 34 are buckled with each other at the front side die 31 and the rear side die 32 and jointly enclose the front side die and the rear side die to form the forming cavity, the first cavity 33 and the second cavity 34 are divided into half parts relative to the forming cavity, and the first cavity 33 and the second cavity 34 are provided with parts for forming the inlet 11, the outlet 13, the connecting port 14 and the valve chamber 12, so that the outer profile surface of the gate valve body can be formed conveniently. When the front side die 31 and the rear side die 32 are installed or demolded, the front side die 31 and the rear side die 32 can be linearly moved towards the direction approaching or separating from each other, so that the whole demolding process is simple and convenient. Preferably, at least one casting nozzle 5 is formed at the bottom of the front mold 31 and the rear mold 32, and the casting nozzle 5 at the bottom is concavely formed at one side surface of the front mold 31 and the rear mold 32 facing each other so as to gradually cast from the bottom upward when the metal casting liquid is injected, so that the metal casting liquid in the cavity is uniformly distributed.

As shown in fig. 3, the first cavity 33 and the second cavity 34 each include a first cavity section 3a for shaping the outer contour surface of the inlet 11, a second cavity section 3b for shaping the outer contour surface of the outlet 13, a third cavity section 3c for shaping the outer contour surface of the connection port 14, and a fourth cavity section 3d for communicating the first cavity section 3a, the second cavity section 3b, and the third cavity section 3c, respectively, and for shaping the outer contour surface of the valve chamber 12, the first cavity section 3a, the valve chamber 12, and the second cavity section 3b being coaxially distributed.

Because the whole gate valve body is provided with three ports, and the casting nozzle 5 is usually smaller, for this reason, when the molten metal is injected into the cavity from only one position, the deviation of the cooling degree of the molten metal injected in the earlier stage and the molten metal injected in the later stage is easily caused to be too large, the fluidity is poor, and the quality of the formed gate valve body is lower. For this reason, the casting cavities 364 communicating with the first cavity 33 or the second cavity 34 are concavely formed toward the same side at the positions of the flange plate corresponding to the inlet 11, the flange plate of the outlet 13 and the flange plate of the connection port 14 on the front mold 31 or the rear mold 32, so that when the metal casting liquid is injected, the metal casting liquid can be simultaneously injected into the cavity from the positions of the three ports of the valve body through the plurality of casting cavities 364, so that the casting efficiency is accelerated, the volume and the direction of the metal casting liquid injected into the cavity are controlled, the fluidity in the cavity is ensured, the casting cavities 364 can be quickly solidified, and the functions of preventing the feed back flow and preventing the shrinkage recess of the molded product caused by too fast pressure drop of the cavity are provided. The front side die 31 and the rear side die 32 are respectively formed with a first opening 351, a second opening 352 and a third opening 353 which are communicated with the first cavity 33 and the second cavity 34 at positions corresponding to the inlet 11, the outlet 13 and the connection port 14 of the valve body, the first opening 351 is communicated with the first cavity section 3a and is coaxially distributed, the second opening 352 is communicated with the second cavity section 3b and is coaxially distributed, and the third opening 353 is communicated with the third cavity section 3c and is coaxially distributed. The inner mold part 4 can be mounted or dismounted in the molding cavity through the first opening 351, the second opening 352 and the third opening 353. Preferably, on a side surface of the front mold 31 and the rear mold 32 opposite to the first cavity section 3a, a first side plate 361 is formed by dividing an inner wall of the first cavity section 3a away from the second cavity section 3b along a radial direction of the first cavity section 3a, the first side plate 361 is respectively surrounded with the front mold 31 and the rear mold 32 to form the first cavity section 3a, the first opening 351 is formed on the first side plate 361 in a semi-penetrating manner along an axial direction of the first cavity section 3a, and a first casting cavity 364 is formed between a side surface of the first side plate 361 corresponding to the rear mold 32 opposite to the rear mold 32 in a surrounding manner so as to facilitate the injection of metal casting liquid into the first cavity section 3a through the first casting cavity 364. On one side surface of the front side mold 31 and the rear side mold 32, which are opposite to the second cavity section 3b, a second side plate 362 is formed by dividing the inner wall of one side of the second cavity section 3b away from the first cavity section 3a along the radial direction of the second cavity section 3b, the second side plate 362 is respectively surrounded with the front side mold 31 and the rear side mold 32 to form the second cavity section 3b, and a second opening 352 is formed on the second side plate 362 in a semi-penetrating manner along the axial direction of the first cavity section 3 a. A second casting chamber 364 is formed in the rear mold 32 and between the opposite side surfaces of the corresponding second side plate 362 so as to facilitate injection of the metal casting liquid into the second chamber section 3b through the second casting chamber 364. A top plate 363 is formed on one side surface of the front mold 31 and the rear mold 32 opposite to the third cavity section 3c by dividing the inner wall of the side of the third cavity section 3c away from the fourth cavity section 3d along the radial direction of the third cavity section 3c, the top plate 363 is respectively surrounded with the front mold 31 and the rear mold 32 to form the third cavity section 3c, and a third opening 353 is formed on the top plate 363 in a semi-penetrating manner along the axial direction of the third cavity section 3 c. A third casting chamber 364 is commonly formed between the rear side mold 32 and the opposite side surface of the top plate 363 corresponding thereto so as to facilitate injection of the metal casting liquid into the third chamber section 3c through the third casting chamber 364. After the gate valve body is molded, a casting block with the shape identical to that of each casting cavity 364 is integrally molded on the gate valve body, the shape of the casting block is set according to the requirement, the casting block is different from the shape and thickness of each flange plate, and the front side mold 31 and the rear side mold 32 can only be peeled in the front-rear direction along the back-to-back direction during demolding, so that certain difficulty is brought to demolding between the rear side mold 32 and the gate valve body. The arrangement of the first side plate 361, the second side plate 362 and the top plate 363 can be removed without affecting the separation of the front side mold 31 and the rear side mold 32 during the removal of the mold, and the first side plate 361, the second side plate 362 and the top plate 363 can be separated from each other in the front side mold 31 and the rear side mold 32 because the first side plate 361, the second side plate 362 and the top plate 363 have cavities for forming the gate valve body, and the first side plate 361, the second side plate 362 and the top plate 363 can be separated from each other in the front-rear direction toward the side away from the inner mold 4 during the removal of the mold, and the first side plate 361 and the second side plate 362 can be separated from each other in the axial direction parallel to the first cavity section 3a, and the top plate 363 can be separated from each other in the axial direction of the third cavity section 3 c.

In order to adapt to the casting cavity 364 with more shapes, for this purpose, a first mounting groove 371 which is communicated with the first cavity section 3a and is semicircular is concavely arranged on the inner wall of the flange plate of the front side mold 31 and the rear side mold 32 along the circumferential direction of the first cavity section 3a, and the first mounting groove 371 is communicated with one side far away from the fourth cavity section 3d along the axial direction of the first cavity section 3a, and after the front side mold 31 and the rear side mold 32 are buckled, the two first mounting grooves 371 are enclosed to form a cylindrical cavity. And a first annular movable block 372 with an outer wall matched with the first mounting groove 371 is mounted in the first mounting groove 371 of the rear side mold 32 of the front side mold 31 along an axial direction parallel to the first cavity section 3a so as to form a circular ring structure after the two first annular movable blocks 372 are buckled. The inner walls of the first annular movable block 372 facing away from the first mounting groove 371 and the first side plate 361 are surrounded together to form the first cavity section 3a, and the first casting cavity 364 is formed on one side surface of the first side plate 361 where the rear side mold 32 is located, which is opposite to the first annular movable block 372, so that after the front side mold 31 and the rear side mold 32 are demolded, the first side plate 361 and the first annular movable block 372 are stripped from the gate valve body in the most appropriate direction according to the shapes of the actual casting cavity 364 and the casting block, thereby reducing the demolding difficulty. Preferably, in order to facilitate the connection tightness between the first annular movable block 372 and the inner wall of the first installation groove 371, for this purpose, a stepped surface is formed on one side of the first installation groove 371 adjacent to the first cavity section 3a in the circumferential direction of the first cavity section 3a, and the first annular movable block 372 is formed on a protrusion complementary thereto, so as to increase the contact area between the first annular movable block 372 and the first installation groove 371, and when the first annular movable block 372 is connected to the first installation groove 371 by using the auxiliary adhesive, the connection tightness can be increased, and at the same time, the accurate alignment between the first annular movable block 372 and the first installation groove 371 can be ensured. Correspondingly, a second mounting groove 373 and a second annular movable block 374 are provided on the inner walls of the second cavity sections 3b of the front mold 31 and the rear mold 32 corresponding to the flange plates of the outlet 13 in such a manner as to be disposed in the first mounting groove 371 and the first annular movable block 372, and a second casting cavity 364 is formed on one side surface of the second annular movable block 374 opposite to the second side plate 362, and the detailed structure and positional relationship correspond to the first mounting groove 371 and the first annular movable block 372, and as shown in fig. 2 to 6, will not be repeated herein.

The gate valve body has several marks on its outer surface, in order to avoid the trouble and cost of reprocessing the gate valve body in the late stage of forming, for this purpose, on the inner wall of the first cavity 33 and corresponding to the position of each mark, there is concave fourth installation groove 381 in cuboid form, and install the second movable block 382 adapting to it (i.e. basically consistent in shape and size) in the fourth installation groove 381, there is pattern and characters in mirror image with the content on the mark on one side of the second movable block 382 facing the back side die 32, and the fourth installation groove 381 and the second movable block 382 in square structure can both be installed more conveniently, in demolding, the second movable block 382 can be peeled off the formed valve body together with the front side die 31, or peeled off from the gate valve body alone after the front side die 31 is peeled off, the whole operation process and the knowledge of the die are simpler, and one side of the second movable block 382 facing the back side die 32 and the front side die 31 are jointly set up to form the first cavity 33, so as to enable the gate valve body to be integrally formed on the outer surface of the gate valve body after the gate valve body is formed.

As shown in fig. 2 to 9, the inner mold portion 4 includes a first mold core 41 penetrating at the first opening 351 and extending into the first cavity 33 and the second cavity 34 for molding the inner contour surface of the inlet 11, a second mold core 42 penetrating at the second opening 352 and extending into the first cavity 33 and the second cavity 34 for molding the inner contour surface of the outlet 13, a third mold core 43 penetrating at the third opening 353 and extending into the first cavity 33 and the second cavity 34 for molding the connecting port 14 and the inner contour surface of the valve chamber 12, and a pin 44 sequentially penetrating through the first mold core 41, the second mold core 42, and the third mold core 43. One end of the third mold core 43 penetrating the third opening 353 extends into the third cavity section 3c and the fourth cavity section 3d in order, and the shapes and sizes of the portions of the third mold core 43 penetrating the third cavity section 3c and the fourth cavity section 3d are in conformity with the inner contour surfaces of the connection port 14 and the valve chamber 12 to be adapted, thereby being used for molding the inner contour surfaces (inner walls) of the connection port 14 and the valve chamber 12. One end of the first mold core 41 penetrating into the first opening 351 extends into the first cavity section 3a and is attached to one side of the third mold core 43 extending into the fourth cavity section 3d facing the first opening 351, and the shape and the size of the portion of the first mold core 41 penetrating into the first cavity are consistent with the inner contour surface of the inlet 11 to be matched, so that the inner contour surface of the inlet 11 is formed. One end of the second mold core 42 penetrating into the second opening 352 extends into the second cavity section 3b and is attached to one side of the third mold core 43 extending into the fourth cavity section 3d facing the second opening 352, and the shape and the size of the portion of the second mold core 42 penetrating into the second cavity are consistent with the inner contour surface of the outlet 13 so as to be matched with each other, so that the inner contour surface of the outlet 13 is formed. In the content defined by this embodiment, the first mold core 41 is attached between one end of the third mold core 43 and the third mold core 43, and the second mold core 42 is attached between one end of the third mold core 43 and the third mold core 43, and is respectively enclosed to form the third cavity 6 with a shape and a size consistent with those of the valve seat 2 for adapting, and the two third cavities 6 are distributed in mirror images and are both communicated with the first cavity 33 and the second cavity 34, so that after casting, the metal casting liquid is cooled and formed to form the valve seat 2 integrally formed with the valve body, thereby greatly reducing the production difficulty and cost of the gate valve body and greatly shortening the production period. The first mold core 41, the third mold core 43 and the second mold core 42 are sequentially communicated with each other along the axial direction of the first cavity section 3a by the first mold core 41 to form collinear pin holes, and the pin shaft 44 sequentially passes through the pin holes of the first mold core 41, the third mold core 43 and the second mold core 42, preferably, the pin holes of the first mold core 41 and the second mold core 42 are formed in the center, so that the first mold core 41, the second mold core 42 and the third mold core 43 can be quickly aligned during mold assembly, the connection accuracy between inner film parts is ensured, the difficult alignment between the parts of the inner film parts is avoided, and the cost increase and the material waste caused by the non-conforming of the gate valve body after molding to the production requirement due to the non-alignment between the first mold core 41, the second mold core 42 and the third mold core 43 are avoided. A first through groove for allowing one end of the pin shaft 44 to pass through is formed on a side surface opposite to the first side plate 361 and opposite to the pin hole, and a second through groove for allowing the other end of the pin shaft 44 to pass through is formed on a side surface opposite to the second side plate 362 and opposite to the pin hole, so that the inner film part and the outer film part 3 can be aligned and positioned quickly, and the freedom degrees between the outer film part 3 and the inner film part and between the inner film parts in the radial direction along the first cavity 33 are limited.

The first mold core 41 comprises a first end plate 411, a first mold section 412, a second mold section 413 and a third mold section 414, wherein the first end plate 411 is arranged outside the first opening 351, the first mold section 412 is plugged in the first opening 351, the second mold section 413 is arranged in the first cavity section 3a and is matched with the shape of the inner contour surface of the inlet 11 in size, the third mold section 414 is arranged in the fourth cavity section 3d and is matched with the shape of the inner contour surface of the valve seat 2 on the side close to the first opening 351 in size, and the diameter of the first end plate 411 is larger than that of the first opening 351 so as to limit the first end plate 411 to enter the first opening 351, and therefore the first mold core 41 is limited to extend to the depth in the cavity; and first end plate 411 has a feature to facilitate providing a fulcrum for the use of an auxiliary stripping tool during stripping, thereby facilitating prying first mold core 41 from connecting port 11. The second 413 and third 414 mould sections have the same diameter and are adapted to the inner diameters of the inlet 11 and the valve seat 2. Preferably, the diameter of the first opening 351 and the diameter of the first mold section 412 are the same as those of the second mold section 413, so that the first mold core 41 can be demolded toward the side far from the gate valve body in the axial direction of the inlet 11 during demolding, and the first mold core 41 is easily separated from the gate valve body because the inner cavities of the inlet 11 and the valve seat 2 are cylindrical.

The second mold core 42 comprises a second end plate 421 positioned outside the second opening 352, a fourth mold section 422 blocked in the second opening 352, a fifth mold section 423 positioned in the second cavity section 3b and matched with the shape and the size of the inner contour surface of the outlet 13, and a sixth mold section 424 positioned in the fourth cavity section 3d and matched with the shape and the size of the inner contour surface of the valve seat 2 near one side of the second opening 352, wherein the diameter of the second end plate 421 is larger than the diameter of the second opening 352 so as to prevent the second end plate 421 from entering the second opening 352 and limit the penetration depth of the second mold core 42 to a certain extent; and second end plate 421 has a feature to facilitate providing a fulcrum for the use of an auxiliary stripping tool during stripping to facilitate prying second mold core 42 from outlet 13. The fifth and sixth mold segments 423 and 424 have the same diameter and are each adapted to the inner diameters of the outlet 13 and the valve seat 2. Preferably, the diameter of the second opening 352 and the diameter of the fourth die segment 422 are the same as the diameter of the fifth die segment 423, so that the second die core 42 can be demolded in the axial direction of the outlet 13 toward the side away from the gate valve body during demolding, and for this reason, the second die core 42 is also easily separated from the gate valve body because the outlet 13 and the inner cavity of the valve seat 2 are both cylindrical.

The third mold core 43 has a connecting portion 43a which is located in the third cavity section 3c and conforms to the shape and size of the inner contour surface of the connection port 14 to be adapted thereto, and a molding portion 43b which is located in the fourth cavity section 3d and conforms to the shape and size of the inner contour surface of the valve housing 12, and the molding portion 43b is located between the third mold section 414 and the sixth mold section 424 to be used for generating the inner contour surface of the connection port 14 and the inner contour surface of the valve housing 12 after the metal casting liquid is injected into the desired cavity and cooled and molded. The forming part 43b is provided with a fifth cavity 45 which is matched with the shape and the size of the outer contour surface of the valve seat 2 on the two side surfaces facing the third mould section 414 and the sixth mould section 424 and opposite to the positions of the third mould section 414 and the sixth mould section 424, the end parts of the third mould section 414 and the sixth mould section 424 which are not facing the forming are respectively attached to the inner walls of the two fifth cavity 45, and the third cavity 6 is formed by encircling the fifth cavity 45 and the third mould section 414 facing the first opening 351 side and the fifth cavity 45 and the sixth mould section 424 facing the second opening 352 side respectively, so that the valve seat 2 is integrally formed after the valve body is produced.

The connection portion 43a of the third mold core 43 includes a third end plate 431 located outside the third opening 353, a seventh mold segment 432 plugged in the third opening 353, and an eighth mold segment 433 located in the third cavity segment 3c and having a shape and size consistent with those of the inner contour surface of the connection port 14 to be adapted thereto, which are sequentially connected, so as to generate the inner contour surface of the connection port 14 after injecting the metal casting liquid into the cavity and cooling and molding. Wherein the diameter of the third end plate 431 is larger than the diameter of the third opening 353 to prevent the third end plate 431 from entering into the third opening 353, and the third end plate 431 has a function to facilitate the use of an auxiliary stripping tool in stripping and thus facilitate the prying of the third mold core 43 from the connection port 14. Rib grooves 435 which are matched with the shape and the size of the profile surfaces of the rib plates 15 are respectively concavely formed on two sides of the eighth mold section 433 facing the third mold section 414 and the sixth mold section 424, and when the metal casting liquid is injected into the cavity and cooled and molded, the rib plates 15 which are integrally molded with the inner profile surfaces of the connecting ports 14 are generated. The forming portion 43b of the third mold core 43 includes a ninth mold segment 434 that is located in the fourth cavity segment 3d and conforms to the shape and size of the inner contour surface of the valve chamber 12 to form the inner contour surface of the valve chamber 12 after the metal casting liquid is injected into the cavity and cooled for forming. The two fifth cavity sections 45 are respectively formed on the side of the ninth mold section 434 facing the first opening 351 and the side facing the second opening 352, when the third mold section 414 is attached to the fifth cavity section 45 facing the first opening 351, the third mold section 45 and the fifth mold section 45 enclose together to form a third cavity 6 with a shape and size consistent with those of the valve seat 2 near the inlet 11 side for adapting, and when the sixth mold section 424 is attached to the fifth cavity section 45 facing the second opening 352, the third mold section 424 and the fifth cavity 45 enclose together to form a third cavity 6 with a shape and size consistent with those of the valve seat 2 near the outlet 13 side for adapting.

However, since the rib 15 is present on the inner contour surface of the connection port 14, it is obviously difficult to separate the rib 15 from the rib groove 435 to peel off the third mold core 43 directly along the axial direction of the connection port 14, and it is obviously difficult to take out the complete third mold core 43 without squeezing and damaging the rib 15. To this end, the eighth and ninth mold segments 433 and 434 are each divided horizontally starting from the side of the rib groove 435 close to the third end plate 431 on the side of the eighth and ninth mold segments 433 and 434 facing the third mold segment 414 and starting from the side of the eighth and ninth mold segments 433 facing the sixth mold segment 424 in a direction perpendicular to the axial direction of the eighth mold segment 433 and continuing to divide toward the side away from the third opening 353 until penetrating the ninth mold segment 434 toward the side away from the third end plate 431 to form a "7" -shaped dividing surface 436, both dividing surfaces 436 divide both sides of the eighth and ninth mold segments 433 and 434 into a first module 437 on the inner side and two second modules 438 on the outer side (i.e., the side close to the third mold segment 414 and the side of the sixth mold segment 424, respectively), and both dividing surfaces 436 are mirror-image, and both dividing surfaces 436 gradually approach from the side close to the fourth cavity segment 3d from the side close to the third opening 353 so that the first module 437 is gradually narrowed and wedge-shaped away from the end of the third end plate 431. When the first end plate 411 and the seventh die forging are integrally connected to the first module 437, the first module 437 can be pulled out in the axial direction of the connection port 14 toward the side away from the gate valve body after the first module 437 is pried by the first end plate 411 during the die stripping, and the first module 437 can be removed, and after the first module 437 is removed, a space is left between the two second modules 438 in the connection port 14, and at this time, when any one of the second modules 438 is stripped, the second module 438 can be moved toward the other second module 438 side in the radial direction of the connection port 14, so that the rib 15 can be separated from the rib groove 435, and the second module 438 can be removed in the axial direction of the connection port 14 until the rib 15 is completely separated from the rib groove 435, so that the second module 438 can be removed without damaging the rib 15. Preferably, the side of the dividing surface 436 near the third end plate 431 is divided in the horizontal direction by the rib groove 435 at a position perpendicular to the axial direction of the third cavity 6, so that the second module 438 and the first module 437 together form the rib groove 435, thereby avoiding the crisscrossed portion of the rib groove 435 from obstructing the demolding at the time of demolding.

Since the outer contour of the ninth mold segment 434 is adapted to the inner contour surface of the valve housing 12, for this purpose, the outer contour of the ninth mold segment 434 is cylindrical, and the outer side surface of the ninth mold segment 434 is rounded to form an arc surface protruding outward, and the diameter of the valve housing 12 is larger than the diameter of the connection port 14, for this purpose, the diameter of the ninth mold segment 434 adapted to the valve housing 12 is larger than the inner diameter of the connection port 14, and therefore, the inner contour surface of the connection port 14 is pressed by the first module 437 to cause deformation of the inner wall of the connection port 14 with a high probability, which affects the quality of the connection port 14. Preferably, the portion of the ninth mold segment 434 on the first mold block 437 is a circular segment having a diameter greater than the diameter of the eighth mold segment 433. First flaps 439 protruding toward away from the first module 437 are formed on both sides of the circular portion just opposite to the two fourth cavity sections 3d by dividing from the eighth die section 433 toward the side away from the third end plate 431 in the axial direction of the seventh die section 432 so that the maximum length of the first module 437 in the radial direction parallel to the connection ports 14 after disengaging the two first flaps 439 is equal to or less than the diameters of the eighth die section 433 and the connection ports 14, thereby enabling the first module 437 to be demolded in divided portions. Preferably, the first module 437 is divided in half from the center of the third end plate 431 toward the side of the ninth end plate 434 away from the third end plate 431 along the axial direction perpendicular to the seventh die section 432 and the axial direction perpendicular to the first die section 412 to form a left half close to the third die section 414 and a right half close to the sixth die section 424, and vertical grooves corresponding to the vertical grooves on the inner contour surface of the connecting port 14 in size and shape are symmetrically recessed on the opposite sides of the left half and the right half and facing the first cavity 33 and the second cavity 34, respectively, so that the vertical grooves are integrally formed after the metal casting liquid is injected into the cavity and cooled and formed, and simultaneously, the gate valve body can be peeled off from the first module 437 more easily during demolding.

Since the gap left by the second module 438 after the first module 437 is removed is limited, and the length of the second module 438 in the front-rear direction (the length of the second module 438) is fixed, this results in that when the second module 438 moves toward the side away from the rib 15 where it is located, the second module 438 can move only by the length of the left half or the right half in the left-right direction (the width of the left half or the right half) due to the blocking of the vertical bar, which results in a limited range of movement of the second module 438, if the width of the second module 438 is greater than the width of the left half or the right half, the rib 15 is blocked by the vertical bar and continues to move before the rib 15 completely exits the rib 435, and at this time the rib 15 has largely exited the rib 435, but still a part is located in the rib 435, and although the remaining part exits the rib 435 by tilting the second module 438, there is still a small part of the rib 15 that is compressed, which affects the life of the rib 15. For this purpose, both the second modules 438 include a first sub-module 4381 divided by the eighth module 433 and a second sub-module 4382 divided by the ninth module 434, and the second module 438 is divided into the first sub-module 4381 and the second sub-module 4382 by the boundary line between the eighth module 433 and the ninth module 434 as a dividing line, so that, when demoulding, the first sub-module 4381 can be separated from the rib plate 15 in the horizontal direction, and then a part of the rib plate 15 still remains in the rib groove 435 on the first sub-module 4381, and at this time, the first sub-module 4381 can be directly moved in the axial direction of the connecting port 14, and of course, the first sub-module 4381 can also be directly peeled in the axial direction of the connecting port 14. The fifth cavity section 45 is formed on the two second sub-modules 4382 respectively, and since the shape of the second sub-modules 4382 is adapted to the valve chamber 12 and the valve seat 2 and is divided by the dividing surface 436, the overall structure of the second sub-modules 4382 is wedge-shaped, and since the arrangement of the fifth cavity section 45 makes the periphery of the edge of one side of the second sub-modules 4382 facing the third or sixth mold sections 414, 424 form a flange, therefore, the demolding of the second sub-modules 4382 directly along the axial direction of the connecting port 14 obviously cannot be performed without damaging the valve body of the gate valve, and after the demolding of the first sub-modules 4381 is completed, the length of the second sub-modules 4382 in the axial direction of the connecting port 14 is greatly shortened relative to the second sub-modules 438. While to ensure the integrity of the fifth chamber section 45 on the second sub-module 4382, for this purpose, the eighth die section 433, which still retains a portion on the side of the second sub-module 4382 close to the third end plate 431, corresponds to a small portion of the side of the rib 15 close to the valve chamber 12, and the overall trend of this portion is in a narrowing structure from the side close to the third end plate 431 toward the side of the valve chamber 12, and a portion of the rib groove 435 is divided on the second sub-module 4382, and the rib groove 435 on the second sub-module 4382 communicates with the fifth chamber section 45 in the axial direction of the seventh die forging so as to be adapted to the structure in which the rib 15 is connected to the valve seat 2. For this purpose, when the second sub-module 4382 is released, the blocking of the first sub-module 4381 is no longer present, so that any second self-module, when moving towards the other second sub-module 4382, only the first module 437 in time leaves enough space for the rib 15 to exit the small rib slot 435 on the second sub-module 4382 and for the valve seat 2 to exit the fifth chamber section 45, and then is removed in the axial direction of the connection port 14. When the valve seat 2 is completely withdrawn from the fifth cavity section 45 and the second sub-module 4382 cannot move horizontally any more in the space reserved by the first module 437, a small part of the rib plates 15 can not completely withdraw from the rib grooves 435 on the second sub-module 4382, and can move outwards along the axial direction of the connecting port 14 at this time, and the rib grooves 435 are communicated with the fifth cavity section 45, so that the rest of the rib plates 15 can directly pass through the rib grooves 435 to enable the second sub-module 4382 to finish demolding without squeezing the rib plates 15, and ensure the integrity of the gate valve body.

The working mode of one embodiment of the gate valve body production die is as follows:

during assembly, the third mold core 43 is assembled and connected and fastened by using an auxiliary connecting agent according to the sequence of the first module 437, the first sub-module 4381, the second sub-module 4382 and the first movable block 439, and then the first mold core 41, the third mold core 43 and the second mold core 42 are assembled and aligned in sequence through the pin shaft 44, and the inner film part is assembled and connected and fastened; then, after the second movable block 382 is installed and connected to the front side mold 31, the first annular movable block 372 is installed in the first installation groove 371 and the second annular movable block 374 is installed in the second installation groove 373 in sequence, the inner mold 4 is placed and aligned with the first cavity 33 and the second cavity 34, then the front side mold 31 and the rear side mold 32 are buckled, finally, the first side plate 361, the second side plate 362 and the top plate 363 are installed correspondingly in sequence, all gaps are connected in a sealing mode by using an auxiliary connecting agent, metal casting liquid is injected into the casting opening 5 by using a material injection device, and then cooling molding is waited;

in demolding, after the gate valve body is molded, the first side plate 361, the second side plate 362 and the top plate 363 are sequentially removed, the front side mold 31 and the rear side mold 32 are sequentially removed, the second movable block 382, the first annular movable block 372 and the second annular movable block 374 are sequentially peeled off the gate valve body, the demolding of the outer mold portion 3 is completed, the pin shaft 44 is then taken out, the first module 437 is taken out, the first movable block 439, the first sub-module 4381 and the second sub-module 4382 are sequentially taken out, and the first mold core 41 and the second mold core 42 are taken out, so that the demolding of the inner mold portion 4 can be completed.

Claims (10)

1. A gate valve body production die, comprising:

the outer mold part comprises a front mold and a rear mold which are mutually buckled and distributed, a first cavity and a second cavity which are buckled and used for forming the outer contour surface of the valve body are respectively formed in half on one side surface of the front mold and one side surface of the rear mold which are opposite to each other, a first opening, a second opening and a third opening which are communicated with the first cavity and the second cavity are respectively formed in positions, corresponding to an inlet, an outlet and a connecting port of the valve body, of the front mold and the rear mold, a first mounting groove and a second mounting groove are respectively formed in positions, corresponding to the inlet and the outlet of the valve body, of the front mold and the rear mold, a first annular movable block is adapted in the first mounting groove, a second annular movable block is adapted in the second mounting groove, the first annular movable block, the second annular movable block and the front mold are jointly surrounded to form the first cavity, and the first annular movable block, the second annular movable block and the rear mold are jointly surrounded to form the second cavity; and

the internal mold comprises a first mold core penetrating through the first opening and extending to the first cavity and the second cavity for forming an inlet inner contour surface, a second mold core penetrating through the second opening and extending to the first cavity and the second cavity for forming an outlet inner contour surface, and a third mold core penetrating through the third opening and extending to the first cavity and the second cavity for forming a connecting port and a valve chamber inner contour surface, wherein opposite side surfaces of the first mold core and the second mold core are respectively attached to two sides of the third mold core, and a third cavity for forming a valve seat and communicating the first cavity and the second cavity is formed by encircling on opposite side surfaces of the first mold core and the third mold core and opposite side surfaces of the second mold core and the third mold core.

2. The gate valve body production die of claim 1, wherein: the first cavity and the second cavity all include the first cavity section that communicates first opening and be used for shaping import outline face, the second cavity section that communicates the second opening and be used for shaping export outline face, the third cavity section that communicates the third opening and be used for shaping connector outline face and the fourth cavity section that communicates first cavity section, second cavity section and third cavity section respectively and be used for shaping valve outdoor outline face, first opening, first cavity section, second opening and second cavity section coaxial distribution, first mold core wears to locate in first opening and the first cavity section, the second mold core wears to locate in second opening and the second cavity section, the third mold core wears to locate in third opening, third cavity section and the fourth cavity section.

3. The gate valve body production die of claim 2, wherein:

the front side die and the rear side die are just divided on one side surface of the first cavity section to form a first side plate, the first side plate is respectively surrounded with the front side die and the rear side die to form the first cavity section, and the first opening is formed on the first side plate in a penetrating way;

the front side die and the rear side die are just divided on one side surface of the second cavity section to form a second side plate, the second side plate is respectively surrounded with the front side die and the rear side die to form the second cavity section, and the second opening is formed on the second side plate in a penetrating way;

The front side die and the rear side die are just divided on one side face of the third cavity section to form a top plate, the top plate is respectively encircled with the front side die and the rear side die to form the third cavity section, the third opening is formed on the top plate in a penetrating way, and casting cavities are concavely formed between the first side plate and the first annular movable block, between the second side plate and the second annular movable block and between the top plate and the rear side die.

4. The gate valve body production die of claim 2, wherein: the first mold core, the third mold core and the second mold core are sequentially communicated with each other along the axial direction of the first cavity section on the first mold core to form collinear pin holes, the inner mold part further comprises a pin shaft which sequentially penetrates through the pin holes on the first mold core, the third mold core and the second mold core, and two ends of the pin shaft penetrate out of the outer mold part.

5. The gate valve body production die of claim 2 or 4, wherein: the first mold core comprises a first end plate positioned outside the first opening, a first mold section plugged in the first opening, a second mold section positioned in the first cavity section and used for forming an inner contour surface of an inlet, and a third mold section positioned in the fourth cavity section and used for forming an inner contour surface of one valve seat, which are sequentially connected.

6. The gate valve body production die of claim 5, wherein: the second mold core comprises a second end plate positioned outside the second opening, a fourth mold section plugged in the second opening, a fifth mold section positioned in the second cavity section and used for forming the inner contour surface of the outlet, and a sixth mold section positioned in the fourth cavity section and used for forming the inner contour surface of the other valve seat, which are sequentially connected.

7. The gate valve body production die of claim 6, wherein: the third mold core is provided with a connecting part which is positioned in the third cavity section and used for forming the inner contour surface of the connecting port and a forming part which is positioned in the fourth cavity section and used for forming the inner contour surface of the valve chamber, the forming part is positioned between the third mold section and the sixth mold section, the forming part faces to the two side surfaces of the third mold section and the sixth mold section and is opposite to the positions of the third mold section and the sixth mold section, the positions of the forming part, which are opposite to the positions of the third mold section and the sixth mold section, are respectively provided with a fifth cavity section used for forming the outer contour surface of the valve seat, the end parts of the third mold section and the sixth mold section are respectively attached to the inner walls of the two fifth cavity sections, and the two fifth cavity sections are respectively enclosed with the third mold section and the sixth mold section to form the third cavity.

8. The gate valve body production die of claim 7, wherein: the third mold core comprises a third end plate, a seventh mold section, an eighth mold section and a ninth mold section, wherein the third end plate is positioned outside the third opening, the seventh mold section is blocked in the third opening, the eighth mold section is positioned in the third cavity section and is used for forming the inner contour surface of the connecting port, the ninth mold section is positioned in the fourth cavity section and is used for forming the inner contour surface of the valve chamber, the fifth mold section is respectively formed on two sides of the ninth mold section, the third end plate, the seventh mold section and the eighth mold section are limited to be the connecting parts, and the ninth mold section is limited to be the forming parts.

9. The gate valve body production die of claim 8, wherein: and rib grooves for forming the profile surfaces of the rib plates on the inner profile surface of the connecting port are respectively formed on two sides of the eighth die section facing the third die section and the sixth die section.

10. The gate valve body production die of claim 9, wherein:

the side of the eighth mold section and the side of the ninth mold section facing the third mold section and the side of the eighth mold section facing the sixth mold section are respectively divided by a part of the rib groove close to the third end plate along the axial direction perpendicular to the eighth mold section and then are continuously divided towards the side far from the third opening to form a 7-shaped dividing surface, the two dividing surfaces gradually approach from the side close to the third opening to the side close to the fourth cavity section, and the two dividing surfaces divide the two sides of the eighth mold section and the ninth mold section into a first module positioned at the inner side and two second modules positioned at the outer side;

the part of the ninth mould section on the first module is divided from the eighth mould section towards the side far away from the third end plate along the axial direction of the seventh mould section on two sides of the two fourth cavities to form a first movable block which is convexly arranged towards the side far away from the first module and used for forming the inner contour surface of a part of valve chamber;

The second module comprises a first sub-module formed by dividing an eighth module section and a second sub-module formed by dividing a ninth module section, and the fifth cavity section is formed on the second sub-module.