JP2002361390A - Metal melt pouring equipment - Google Patents

Abstract

[PROBLEMS] To prevent a metal oxide from being sucked into a cylinder case and to accurately pour molten metal into a mold in an amount corresponding to a movement stroke of a piston. SOLUTION: A molten metal pump 1 provided with a cylinder case 4 capable of sucking and discharging molten metal C through a suction and discharge path 8 by movement of a piston 5, a pouring path 2, a suction path 22, a discharge path 23 and a suction and discharge path are opened. The valve box 19 is provided with a switching valve 3 having a valve body 21 movably movable up and down between a suction position and a discharge position,
The entire valve box is provided below the liquid level of the melting furnace, the discharge path is formed to open upward at the lower end of the valve body moving space 24, a receiving seat 29 is formed around the opening, and the suction path is connected to the discharge path from the discharge path. The valve body is opened in the valve body moving space at a high position, and a contact portion 31 that comes into contact with the receiving seat with the downward movement of the valve body is formed on the valve body. The valve element is moved to a suction position where the communication between the discharge path and the suction / discharge path is interrupted, and the molten metal is drawn into the cylinder case.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a metal melt suction / discharge passage communicating with a cylinder case, and moving a piston in the cylinder case to one side to move a metal melt in a melt furnace through the suction / discharge passage. A melt pump that can be sucked into the cylinder case, and that can discharge the molten metal in the cylinder case through the suction / discharge path by moving the piston to the other, and a metal melt that is discharged through the suction / discharge path into a mold. A pouring passage for pouring, a suction passage communicating with the melting furnace, a discharge passage communicating with the pouring passage, and the suction / discharge passage are formed in the valve box so as to open to a valve body moving space. A suction position where a suction path communicates with the suction / discharge path to block communication between the discharge path and the suction / discharge path, and a communication between the suction path and the suction / discharge path by connecting the discharge path to the suction / discharge path. A switching valve provided with a valve body that can be moved up and down at a discharge position, and moving the valve body to one of the pistons while moving the valve body to the suction position. The molten metal in the cylinder case is sucked into the cylinder case, and the molten metal in the cylinder case is moved to the pouring path by the operation of moving the piston to the other while the valve body is moved to the discharge position. The present invention relates to a molten metal pouring device configured to be discharged.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional molten metal pouring apparatus A, in which a suction / discharge passage 8 for a molten metal C is communicated with a cylinder case 4 to move a piston 5 in the cylinder case 4 upward. Thereby, the molten metal C in the molten metal furnace D can be sucked into the cylinder case 4 through the suction / discharge path 8, and the molten metal C in the cylinder case 4 can be discharged through the suction / discharge path 8 by moving the piston 5 downward. And a drive device 7 such as a pneumatic cylinder for driving and moving the piston 5, a pouring path 2 for pouring the molten metal C discharged through the suction / discharge path 8 into the mold B1, and a molten metal furnace D. The suction passage 22 is communicated with the suction / discharge passage 8 to a valve box 19 formed so that the discharge passage 23 and the suction / discharge passage 8 communicating with the suction passage 22 and the pouring passage 2 are opened to the valve body moving space 24. Discharge path 23 and suction / discharge path 8 A vertically slidable operable valve body 21 is mounted at a suction position where the communication is cut off and a discharge position where the discharge path 23 is connected to the suction and discharge path 8 to cut off the communication between the suction path 22 and the suction and discharge path 8. When a certain switching valve 3 is provided and the valve stem 20 is operated by the valve stem operating tool 16 using a solenoid or the like, the valve element 21 is slid to the suction position as shown in FIG. By moving the piston 5 upward, the molten metal C in the molten metal furnace D is sucked into the cylinder case 4, and the valve element 21 is slid and moved to the discharge position as shown in FIG. When the piston 5 is moved downward in the closed state, the molten metal C in the cylinder case 4 is discharged to the pouring path 2.

When sliding the valve element 21 in the valve box 19 and handling a high-temperature molten metal C that easily reacts with oxygen or the like, a sliding portion 34 between the valve element 21 and the valve box 19 is required. Even if a sealing material or the like is provided in particular, there is a possibility that metal oxide or the like may easily bite between the sliding surfaces and a situation may occur in which the valve body 21 cannot be moved smoothly.
Without providing such a sealing material, a certain amount of clearance is provided between the sliding surfaces so that the metal oxide or the like is hardly caught, and the valve element 21 is slid.

[0004]

Therefore, the molten metal C
5 is repeated when the pouring operation of pouring the mold into the mold B1 is repeated.
As shown in (a), the piston 5 is moved upward while the valve body 21 is slid to the suction position, and the molten metal furnace D is moved.
When the molten metal C inside the cylinder is sucked into the cylinder case 4, the molten metal C remaining in the pouring path 2 is sucked into the cylinder case 4 through the clearance of the sliding portion 34, or as shown in FIG. As shown, the piston 5 is moved downward while the valve body 21 is slid to the discharge position,
When the molten metal C in the cylinder case 4 is discharged to the pouring path 2, the molten metal C in the cylinder case 4
In this case, there is a disadvantage that the amount of the molten metal C corresponding to the moving stroke of the piston 5 cannot be poured into the mold B1 with high accuracy.

That is, when the pouring operation is repeated, it is premised that a part of the molten metal C discharged in the previous pouring operation remains in the pouring path 2 at the liquid surface position P of a predetermined height. Since the next pouring operation is performed, after pouring the molten metal C into the mold B1 in an amount corresponding to the moving stroke of the piston 5,
A portion of the molten metal C discharged during the pouring operation must remain in the pouring path 2 at the same liquid level position P as the molten metal C remaining during the previous pouring operation.

However, at the time of inhaling the molten metal C shown in FIG. 5A, a part of the molten metal C remaining in the pouring channel 2
The liquid level of the molten metal C sucked into the cylinder case 4 side through the clearance of the sliding portion 34 between the valve body 21 and the valve box 19 and remaining in the pouring path 2 is higher than the liquid level P at a predetermined height. When the molten metal C is discharged to the pouring path 2 in the amount corresponding to the movement stroke of the piston 5 at the next pouring operation, the actual pouring amount to the mold B1 is different between the liquid level positions. In addition, when the molten metal C is discharged as shown in FIG. 5 (b), a part of the molten metal C in the cylinder case 4 is cleared by the clearance of the sliding portion 34 when the molten metal C is discharged as shown in FIG. Is discharged to the molten metal furnace D side, the amount of the molten metal C corresponding to the movement stroke of the piston 5 cannot be discharged to the pouring path 2, so that the actual amount of molten metal to the mold B1 becomes insufficient. It is.

Further, since the entire valve box 19 is provided below the liquid level of the molten metal C in the molten metal furnace D, the molten metal C entering the valve box 19 is hardly oxidized, and the gap between the sliding surfaces is reduced. There is an advantage that the amount of metal oxides that may bite can be reduced, but since the suction passage 22 is formed at the lower part of the valve box 19, the metal oxides accumulated at the bottom of the melt furnace D can be removed from the cylinder case. 4 has a disadvantage that it is easy to inhale.

The present invention has been made in view of the above circumstances, and precisely prevents a metal oxide from being sucked into a cylinder case and pours a molten metal in an amount corresponding to a moving stroke of a piston into a mold with high precision. The purpose is to be able to use hot water.

[0009]

According to a first aspect of the present invention, a metal melt suction / discharge path is communicated with a cylinder case, and a piston in the cylinder case is moved to one side to form a metal melt inside the furnace. A molten metal pump capable of sucking the molten metal into the cylinder case through the suction / discharge path, and discharging the molten metal in the cylinder case through the suction / discharge path by moving the piston to the other side; A pouring path for pouring the molten metal discharged through the mold into the mold, a suction path communicating with the molten metal furnace, a discharge path communicating with the pouring path, and the suction / discharge path open to the valve body moving space. A suction position for connecting the suction path to the suction / discharge path to cut off the communication between the discharge path and the suction / discharge path, and a suction path for connecting the discharge path to the suction / discharge path to the formed valve box; A switching valve equipped with a vertically movable operable valve body at a discharge position for blocking communication with the suction and discharge passage, and a valve which is movable to the suction position to one of the pistons when the valve body is moved to the suction position. The moving operation of sucking the molten metal in the melting furnace into the cylinder case, and moving the piston to the other in a state where the valve element is moved to the discharge position, causes the piston to move into the cylinder case. An apparatus for pouring a molten metal into the molten metal pouring path, wherein the entire valve box is provided below a liquid level of the molten metal in the molten metal furnace, and the discharge path is provided. Is formed so as to open upward at the lower end of the valve body moving space, and the suction passage is formed so as to open to the valve body moving space at a position higher than the discharge passage, and the valve of the discharge passage is formed. Lower seat around opening to body movement space A lower contact portion that annularly contacts the lower receiving seat along with the downward movement of the valve body is formed in the valve body, and the lower contact portion is annularly formed on the lower receiving seat. The valve element is moved to a suction position where it comes into contact with and interrupts communication between the discharge path and the suction / discharge path, so that the molten metal in the molten metal furnace is sucked into the cylinder case. It is in.

[Operation] Instead of sliding the valve body to the suction position where the communication between the discharge path and the suction / discharge path is interrupted as in the prior art, the discharge path is opened upward at the lower end of the valve body movement space. And a lower receiving seat formed in an annular shape around the opening thereof, and a lower contacting portion which annularly contacts the lower receiving seat with the downward movement of the valve body is provided on the valve body. The lower contact portion is annularly contacted with the lower receiving seat to move the valve body to the suction position where the communication between the discharge path and the suction / discharge path is interrupted, and the moving operation to one of the pistons moves the inside of the molten metal furnace. Is configured to suck the molten metal into the cylinder case, it is possible to reliably shut off the communication between the discharge path and the suction / discharge path, and to suck the molten metal in the molten metal furnace into the cylinder case. Sometimes, the molten metal remaining in the pouring channel is drawn into the cylinder case Door can be effectively prevented.

Further, the entire valve box is provided below the liquid level of the molten metal in the molten metal furnace, and the discharge path is provided at the lower end of the valve element moving space while preventing oxidation of the molten metal entering the valve box. It is formed so as to open upward, and the suction passage is formed so as to open to the valve body movement space at a position higher than the discharge passage, so that the metal oxides accumulated at the bottom of the molten metal furnace are removed from the cylinder case. Difficult to inhale.

[Effect] When the molten metal in the furnace is sucked into the cylinder case, the metal oxides accumulated at the bottom of the furnace are not easily sucked into the cylinder case and remain in the pouring passage. Since it is difficult for the molten metal to be sucked into the cylinder case side, it is possible to prevent the metal oxide from being sucked into the cylinder case and to accurately pour the molten metal into the mold in an amount corresponding to the stroke of movement of the piston.

According to a second feature of the present invention, the suction passage is formed so as to open downward at an upper end of the valve body moving space, and an upper receiving seat is formed annularly around the opening. Along with the upward movement of the valve body, an upper contact portion that annularly contacts the upper receiving seat is formed on the valve body, and the upper contact portion annularly contacts the upper receiving seat. The present invention is characterized in that the valve element is moved to a discharge position where the communication between the suction path and the suction / discharge path is interrupted, and the molten metal in the cylinder case is discharged to the pouring path.

[Operation] Instead of sliding the valve body to the discharge position where the communication between the suction path and the suction / discharge path is interrupted as in the prior art, the suction path is opened downward at the upper end of the valve body movement space. In the valve case, an upper receiving seat is formed in an annular shape around the opening, and an upper contact portion that annularly contacts the upper receiving seat with the upward movement of the valve body is provided on the valve body. The upper contact portion is annularly contacted with the upper receiving seat to move the valve body to a discharge position where the communication between the suction passage and the suction / discharge passage is interrupted. Since it is configured to discharge the molten metal into the pouring channel,
It is possible to reliably shut off the communication between the suction path and the suction / discharge path, and when discharging the molten metal in the cylinder case to the pouring path, the molten metal in the cylinder case is discharged to the molten metal furnace side. Can be effectively prevented.

[Effect] When the molten metal in the cylinder case is discharged to the pouring path, the molten metal in the cylinder case is not easily discharged to the molten metal furnace side. Pouring into the mold with higher accuracy.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, portions denoted by the same reference numerals as those of the conventional example indicate the same or corresponding portions. First Embodiment FIG. 1 shows a pouring device A for pouring a molten metal C of a magnesium alloy as an example of a molten metal into a mold B1 of a casting device B.
1 and a flow path between a state where the molten metal C in the furnace D can be sucked into the molten metal pump 1 and a state where the molten metal C drawn into the molten metal pump 1 can be discharged to the molten metal path 2. And a switching valve 3 for switching between the two, so that the molten metal C discharged from the molten metal pump 1 can be poured into the mold B1 through the pouring path 2.

The melt pump 1 is integrally formed with a ceramic (silicon nitride) cylinder case 4, a ceramic (silicon nitride) piston 5 reciprocally movable up and down in the cylinder case 4, and a piston 5. A piston driving pneumatic cylinder 7 for reciprocating the piston rod 6 up and down, and a suction / discharge passage 8 for the molten metal C is communicated near the bottom in the cylinder case 4 to move the piston 5 upward, thereby moving the molten metal C upward. The molten metal C in the furnace D can be sucked into the cylinder case 4 through the suction / discharge path 8, and the molten metal C in the cylinder case 4 can be discharged through the suction / discharge path 8 by moving the piston 5 downward.

The cylinder case 4 forms a cylinder chamber 12 by closing a lower opening of a cylinder chamber forming through hole 10 formed in a ceramic case main body 9 with a ceramic lid plate 11. The base plate 14 fixed to the lid 13 and the outer peripheral side of the case main body 9 are connected by a connecting arm 15 made of ceramic (silicon nitride), so that the entire cylinder case 4 can be moved up and down by the liquid level of the molten metal C in the molten metal furnace D. A support table 17 for supporting the pneumatic cylinder 7 for driving the piston and the pneumatic cylinder 16 for operating the valve is fixed to the base plate 14 with a support 18 at a lower position than the molten metal C.

As shown in FIGS. 2 and 3, the switching valve 3 has a case body 9 formed of a valve box 19, and the entire valve box 19 is provided with a liquid level raising / lowering range of a molten metal C in a molten metal furnace D. A valve body 21 made of ceramic (silicon nitride) integrally provided with a valve rod 20 is mounted on the valve box 19 so as to be movable up and down. The suction passage 22 communicating with the water supply passage, the discharge passage 23 communicating with the pouring passage 2, and the suction and discharge passage 8 are formed so as to open to the valve body moving space 24.

As shown in FIGS. 2 and 3, the valve element moving space 24 has a cylindrical valve element mounting hole 2 through which the valve element 21 can be inserted and removed.
5 is formed in the case body 9, and a sleeve 26 is inserted and fixed in the upper inner peripheral surface of the valve body mounting hole 25 so as to be freely inserted and withdrawn, and is formed in a valve body mounting hole portion below the sleeve 26. The discharge passage 23 is formed so as to open upward at the lower end of the valve body moving space 24, and a suction through hole 27 is formed between the case body 9 and the sleeve 26, so that the discharge passage 23 is positioned higher than the discharge passage 23. The suction passage 22 which opens downward at the upper end of the valve body moving space 24 is formed by the suction through hole 27 and the inside of the sleeve 26, and slides against the inner surface of the sleeve 26 while sliding the valve stem 20 and the sleeve 26. A closing member 28 for closing the gap between the valve stem 20 and the valve shaft 20 is provided on the valve stem 20.

An upwardly facing lower receiving seat 29 is formed in an annular shape around the opening of the discharge passage 23 to the valve body moving space 24, and around the opening of the suction passage 22 to the valve body moving space 24, In other words, a downwardly facing upper receiving seat 30 is formed in the lower end surface of the sleeve 26 in an annular shape, and the lower contacting portion 31 that annularly contacts the lower receiving seat 29 as the valve body 21 moves downward.
An upper contact portion 32 that annularly contacts the upper receiving seat 30 with the upward movement of the valve body 21 is formed on the valve body 21.

Then, as shown in FIG. 2, the upper contact portion 32 is separated from the upper receiving seat 30 by the expansion and contraction operation of the valve operating pneumatic cylinder 16, and the suction passage 22 communicates with the suction / discharge passage 8, and The suction position at which the contact portion 31 abuts on the lower receiving seat 29 in an annular manner to cut off the communication between the discharge passage 23 and the suction / discharge passage 8, and as shown in FIG. The discharge passage 23 is separated from the suction passage 8 and the discharge passage 23 is communicated with the suction passage 8, and the upper contact portion 32 is annularly contacted with the upper receiving seat 30 to cut off the communication between the suction passage 22 and the suction and discharge passage 8. , The valve body 21 is provided so as to be vertically movable, and FIG.
By moving the piston 5 upward while the valve body 21 is moved to the suction position shown in (a), the molten metal C in the molten metal furnace D is connected to the suction passage 22 as shown in FIG. By sucking into the cylinder case 4 through the suction / discharge passage 8 and moving the piston 5 downward in a state where the valve body 21 shown in FIG. 3 (a) is moved to the discharge position, the operation shown in FIG. Thus, the molten metal C in the cylinder case 4 is discharged to the pouring path 2 through the suction / discharge path 8 and the discharge path 23 and can be poured into the mold B1.

[Second Embodiment] FIG. 4 shows a main part of another embodiment of a pouring device A, in which a valve body 33 slidable up and down with respect to the inner surface of a sleeve 26 is attached to a valve stem 20. 4 (a), the valve body 33 comes out of the sleeve 26 to connect the suction passage 22 to the suction / discharge passage 8, and
FIG.
As shown in (b), the lower contact portion 31 is
The valve body 21 is moved to the discharge position where the discharge passage 23 communicates with the suction / discharge passage 8 while being separated from the suction passage 8, and the valve body 33 is fitted into the sleeve 26 to block the communication between the suction passage 22 and the suction / discharge passage 8. Is provided so as to be vertically movable. Other configurations are the same as those of the first embodiment.

[Other Embodiments] The apparatus for pouring molten metal according to the present invention may be a device for pouring a molten metal such as aluminum, zinc or tin into a mold.

[Brief description of the drawings]

FIG. 1 is a partial sectional side view of a molten metal pouring apparatus.

FIG. 2 is a partial cross-sectional side view of a main part.

FIG. 3 is a partial cross-sectional side view of a main part.

FIG. 4 is a partial cross-sectional side view of a main part showing a second embodiment.

FIG. 5 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molten pump 2 Pouring path 3 Switching valve 4 Cylinder case 5 Piston 8 Intake / discharge path 19 Valve box 21 Valve 22 Suction path 23 Drain 24 Valve body moving space 29 Lower receiving seat 30 Upper receiving seat 31 Lower contact part 32 Upper part Contact part B1 Mold C Molten metal D Molten furnace

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Hiroshi Yamaguchi 1-47, Shishitsuhigashi, Namiwa-ku, Osaka-shi, Osaka Prefecture Inside Kubota Co., Ltd. 1-chome 2-47 Kubota Corporation

Claims (2)

[Claims] 1. A metal melt suction / discharge path is communicated with a cylinder case, and a piston in the cylinder case is moved to one side so that a metal melt in a melt furnace can be sucked into the cylinder case through the suction / discharge path. And a melt pump capable of discharging the molten metal in the cylinder case through the suction / discharge path by moving the piston to the other, and a pouring path for pouring the molten metal discharged through the suction / discharge path into a mold. A suction passage communicating with the melting furnace, a discharge passage communicating with the pouring passage, and a suction / discharge passage formed in the valve box so as to open to a valve body moving space; And a discharge position at which the discharge path communicates with the intake / discharge path to cut off the communication between the suction path and the suction / exhaust path. A switching valve mounted with a movably operable valve body, and moving the valve body to one of the pistons in a state where the valve body is moved to the suction position, so that the molten metal in the smelting furnace is It is configured to suck into the cylinder case and discharge the molten metal in the cylinder case to the pouring path by a movement operation of the piston to the other while the valve body is moved to the discharge position. An apparatus for pouring a molten metal, wherein the entire valve box is provided below the liquid level of the molten metal in the melting furnace, and the discharge path is opened upward at a lower end of the valve element moving space. And the suction passage is formed so as to open to the valve body movement space at a position higher than the discharge passage, and a lower receiving seat is provided around an opening of the discharge passage to the valve body movement space. The valve is formed in an annular shape, A lower contact portion annularly contacting the lower receiving seat is formed in the valve body, and the lower contact portion annularly contacts the lower receiving seat to form a connection between the discharge passage and the suction / discharge passage. An apparatus for pouring molten metal, wherein the valve body is moved to a suction position for interrupting communication, and the molten metal in the molten metal furnace is sucked into the cylinder case. 2. The suction passage is formed so as to open downward at an upper end of the valve body moving space, and an upper receiving seat is formed in an annular shape around the opening portion. Accordingly, an upper contact portion that annularly contacts the upper receiving seat is formed in the valve body, and the upper contact portion annularly contacts the upper receiving seat to allow the suction passage and the suction / discharge passage to communicate with each other. 2. The apparatus for pouring molten metal according to claim 1, wherein the valve element is moved to a discharge position for interrupting communication, and the molten metal in the cylinder case is discharged to the pouring path.