TWI724274B - Exhaust structure of tire mold - Google Patents

Abstract

A tire mold exhaust structure, which is mainly set up a number of exhaust holes in the mold cavity of the tire mold, so as to install an exhaust unit in each exhaust hole, the exhaust unit includes an exhaust needle, a guide pin seat, An elastic piece; wherein the vent needle at both ends of a body is respectively set as a bottom cone portion and a joint end; and the guide pin seat is installed and fixed in the vent hole, and the guide pin seat includes first and second ends. One end is provided with an axial through groove, and the opening end of the through groove is expanded with a taper interface to correspond to the outer surface of the bottom cone. The second end is penetrated with a through hole that communicates with the through groove. The body of the supply and exhaust needle is passed through to cover an elastic piece for the elastic return of the supply and exhaust needle; the exhaust channel is normally closed, and the vulcanization process is carried out in the mold cavity of the raw tire, and the mold cavity is squeezed by the raw tire The compressed air is concentratedly discharged through the interface and the bottom cone, and the air pressure is greater than the elastic force of the elastic member to push the exhaust needle axially upward, so that the air pressure flows from the interface and the bottom cone toward the slot and perforation. Quick exhaust, so under the condition of keeping the tire hair without manual removal, the rubber of the raw tire will not stay in the trough or perforation, so the loss of the rubber can be avoided.

Description

Exhaust structure of tire mold

The present invention relates to an exhaust structure of a tire mold; in particular, a number of exhaust groups installed in the cavity of the tire building mold to remove air are used to prevent tire hair from forming on the surface of the tire, especially the structure of the exhaust group is simplified and exhausted. The effect is rapid.

According to the manufacturing process of the tire, it generally goes through the process of mixing, extrusion, molding, and vulcanization. During the molding process, the green tire is formed, and then it is sent to the vulcanizer for vulcanization process, and the preset time and temperature are controlled. At this time, the tread pattern will be formed at the same time, and the tire will be removed after cooling after completion. During the vulcanization process, the raw tire is put into the mold. The airbag bag in the mold compresses the raw tire toward the mold cavity from the inside. With high temperature and high pressure steam, the rubber molecules and sulfur molecules are combined with heat and pressure to make the mold cavity. The rubber of the tire has better elasticity and durability. The final shape and pattern of the tire are also formed at this stage. After the vulcanization is completed, the tire is taken out and the vulcanization process is completed. During the vulcanization step, the airbag inside the green tire will gradually expel the air between the outside of the green tire and the mold cavity when pressure is applied, so that the outside of the green tire can be completely attached to the mold cavity to form a tire shape and The tire pattern, therefore, the vulcanization mold will be provided with a number of vent holes on the vulcanization mold, so that the gas in the mold cavity can be smoothly discharged through the vent holes; but the venting action will press the green tire into the vent holes. The inside of the tire will then suddenly overflow out of the vent with the air pressure action, resulting in the formation of burr-like lanugo on the tire tread, which requires manual removal of the lanugo one by one, which is very troublesome and time-consuming, and adds a lot of labor cost.

Therefore, a "tireless" type of vulcanization mold exhaust device was later developed. For example, the U.S. Patent No. 6,923,629 B2 disclosed in the following: refer to the previous case 1. A valve body formed integrally with a valve body head inserted into the central through hole of the housing and a valve body insertion portion, a spring surrounding the valve body insertion portion in order to apply elastic force to the valve body, and a lower portion connected to the valve body insertion portion The front end and the stopper that can substantially control the overall movement distance of the valve body in the vertical direction is characterized in that: the central through hole in the housing is tapered, that is, the inner diameter becomes larger toward the upper direction, and toward the lower direction The smaller the inner diameter, the inclination angle of the inclined side surface of the valve body head that is in point contact with the upper end edge of the central through hole is formed to be equivalent to the inclination angle of the edge of the central through hole; the valve body head is inclined The angle of the side surface is an acute angle, and the inclination angle of the upper edge portion of the central through hole is an obtuse angle.

Refer to the mold exhaust structure of the previous case 1, mainly when the inflow of rubber into the central through hole of the exhaust device casing cannot be completely blocked, if the air passage through the exhaust device is minimized, it can prevent the rubber from staying in the air passage. If you try to keep the large space of the central through hole inside, the exhaust performance will be improved and the durability life of the exhaust device will be prolonged. On the other hand, the structure is formed in the central through hole of the housing, which is tapered, and its inner diameter becomes larger as it goes upward, and the inclination angles of the valve body head that are in point contact with the upper edge of the central through hole are different from each other. Improve the air discharge capacity, and can suppress the flow of rubber into the exhaust device.

However, referring to the previous case, the first structure is to install the exhaust needle in the exhaust channel, which will hinder the smoothness of the exhaust. Sometimes the sandblasted sand will enter the exhaust needle when the mold is cleaned by sandblasting. The exhaust needle and the exhaust hole are blocked and the exhaust function is invalid.

Therefore, please refer to the previous case 2, which is the invention patent case of Certificate No. I417180 "Tire Mould Exhaust Group Structure", which mainly includes: a tire mold, which forms a molding A mold cavity, which has at least one vent hole, is a through hole penetrated from the molding cavity to the outside of the tire mold, and a vent reaming hole is formed at the position of the vent hole near the molding cavity; an exhaust group , It has a positioning element, which is arranged at the middle section of the exhaust hole, the positioning element is formed with at least one exhaust passage, and an exhaust needle is inserted through the center of the positioning element, and one end of the positioning element is provided with a Abutting against one of the oblique taper portions of the oblique surface of the exhaust reaming hole, an elastic member is provided between each of the positioning elements and the oblique taper portion to provide the elastic force for the return of the exhaust needle; thereby, the exhaust passages and exhaust The design of the air needle piercing hole separation can make the exhaust more smooth. At the same time, the design of the exhaust reaming and the oblique cone part can make the filling operation after the exhaust have a better tightness.

Refer to the second case of the previous case. Although the tire mold is equipped with an exhaust group, the exhaust is relatively smooth, but there are still some problems in actual use:

1. In the exhaustable state, there is a distance between the exhaust needle and the exhaust reaming hole to form a channel, so when exhausting, the gas enters through the exhaust reaming hole, and passes through the channels and exhausts between the duct seats and the exhaust holes. The air channel is exhausted. Therefore, referring to the structure of the previous case two, the exhaust channel is in the "normally open" state. Therefore, the rubber that enters the mold cavity will partially enter through the exhaust needle and the exhaust reaming channel and the exhaust channel, resulting in The rubber will stay in the vent needle and the vent reaming channel and the vent channel, which will cause blockage and need to clean the rubber in these channels, which increases the trouble and inconvenience of subsequent cleaning operations, and therefore the retention of the rubber , Which slows down the exhaust rate.

2. As mentioned in item 1 above, part of the rubber squeezed into the exhaust needle and the exhaust reaming channel, the exhaust channel, will cause the loss of the rubber, relatively reduce the full utilization of raw materials, and there is unnecessary Consumption of raw materials.

Therefore, it is necessary to develop a tire mold exhaust structure, not only does not need to re-display It can also prevent the rubber from staying in the exhaust channel and accelerate the exhaust speed.

The exhaust structure of the tire mold of the present invention includes: a tire mold with a mold cavity recessed inwardly on one side of the tire mold, and the outer side is positioned relative to the tire tread, and a number of exhaust holes communicating with the mold cavity are provided through the tire mold. The exhaust hole includes a first air hole; an exhaust unit to be installed in the exhaust hole, which includes an exhaust needle, a guide pin seat, and an elastic member; wherein the exhaust needle is a rod-shaped The body, both ends of the body are respectively set as a bottom cone and a joint end, the bottom cone is a cone with an outer diameter larger than the outer diameter of the body; and the guide pin seat is used to install and fix the In the first air hole of the vent hole, the guide pin seat includes two ends, a first end and a second end, respectively. An interface is expanded at the open end, the taper of the inner side wall of the interface corresponds to the taper of the outer side of the bottom cone, and the second end is penetrated with a hole communicating with the through groove for the body of the exhaust needle The connecting end passes through the perforation, the elastic piece is sleeved on the outside of the body, one end of the elastic piece is pressed against the second end, and a lock cap is installed on the connecting end to stop the elastic piece Dislocation; by means of the vent needle during the molding process of the green tire in the mold cavity, when the pressure in the mold cavity is greater than the elastic force of the elastic member, the air in the mold cavity has to push the vent needle to move to make each bottom There is a gap between the cone and the interface, so that air can be discharged from the vent hole between the interface and the bottom cone, the through groove, and the perforation. When the pressure in the cavity is less than the elastic force of the elastic member, then Each of the bottom cones and the interface returns to the attached state.

The effects achieved by the present invention are as follows:

1. The present invention is different from the aforementioned reference cases. It is mainly that the exhaust needle of the exhaust unit is normally closed. The contact port of the guide pin seat contacts the outer surface of the bottom cone of the exhaust needle and passes through The elastic piece is installed on the vent needle, so that the vent needle is in an elastic installation state. When the green tire is vulcanized in the mold cavity, the air squeezed by the green tire in the mold cavity is concentrated between the interface and the bottom cone. When the air pressure exceeds the elastic force of the elastic member, it can push against the bottom cone, so that the exhaust needle is moved upward by the elastic axis, so that there is a greater gap between the interface and the bottom cone, and there is a greater gap between the interface and the bottom cone. The perforation is an exhaust channel, and the supply air pressure is quickly released to exhaust outside the mold cavity when the pressure is released. After the pressure is released, the exhaust needle is pressed by the elastic restoring force of the elastic member to make the bottom cone part contact again When the guide pin seat is inside the opening, the green tire can quickly fill the mold cavity to form smoothly; therefore, the rubber material of the green tire has no space, no time to stay or fill in the through groove of the guide pin seat to maintain the exhaust channel The smoothness completely solves the problem of cleaning the remaining rubber in the exhaust channel of the exhaust group in the past, reduces the loss of rubber, and accurately controls the cost of tire raw materials.

2. Based on the foregoing, the conventional technology is that the exhaust group is in a normally open and exhaustable state, waiting for the gas to be exhausted first, and the green tire pushes against the exhaust needle of the exhaust group to form; the exhaust unit of the present invention It is normally closed. When the gas is squeezed in the mold cavity by the raw tire to the degree of saturation of the elastic member, the air pressure is used to elastically push the exhaust needle axially to retreat, so as to generate the instantaneous pressure relief of the exhaust channel. When completed, the elastic member pushes back the exhaust needle to close the interface at the same time, so that the green tire fills the mold cavity, so the exhaust pressure relief speed of the present invention is faster.

3. It can keep the tire tread surface smooth and complete the molding without the need to scrape the surface fetus again, making the production smoother and more consistent.

10: Tire mold

11: Mould cavity

12: Vent

121: The first stomata

20, 201: exhaust unit

30: Exhaust needle

31: Body

32: bottom cone

34: binding end

341: Lock Cap

40, 401: guide pin seat

41: Cone (barrel)

411: first end

412: second end

42: Through slot

421: Chamfer Ring

422, 424: Interface

423: Relief

43: Piercing

44: Elastic

60: Raw Tire

70: Tires

71: Tread

The first figure is a three-dimensional exploded view of the tire mold and exhaust unit of the present invention.

The second figure is a three-dimensional exploded view of the exhaust unit of the present invention.

The third figure is a combined cross-sectional view of the present invention.

The fourth figure is a combined cross-sectional view of the tire mold, green tire, and exhaust unit of the present invention.

The fifth figure is a cross-sectional view of the exhaust action of the present invention (1).

The sixth figure is an enlarged cross-sectional view of the fifth figure of the present invention.

The seventh figure is a cross-sectional view of the exhaust action of the present invention (2).

Figure 8 is an enlarged cross-sectional view of the exhaust action of Figure 7 of the present invention.

The ninth figure is a cross-sectional view of the present invention after the exhaust is completed and the green tire is formed.

The tenth figure is an enlarged cross-sectional view of the exhausted and green tire forming of the present invention.

Figure 11 is a three-dimensional schematic diagram of the tire building of the present invention.

Figure 12 is an exploded perspective view of the tire mold and the exhaust unit of the second embodiment of the present invention.

Figure 13 is a cross-sectional view of a tire mold, a green tire, and an exhaust unit according to the second embodiment of the present invention.

According to the present invention is a tire mold exhaust structure, as shown in the first and second figures, it includes a tire mold, a number of exhaust units, wherein the tire mold 10 is inward on one side A cavity 11 is recessed and formed as shown in the fourth figure. The position of the outer side of the tire mold 10 relative to the tire tread is provided with vent holes 12 communicating with the cavity 11. The vent holes 12 are as shown in the first, As shown in the four figures, a first air hole 121 is formed at both ends. The first air hole 121 is located at the communicating cavity 11 and communicates with the outside of the tire mold 10. The inner wall surface of the first air hole 121 is tapered and faces the mold cavity 11. The inner hole diameter is gradually larger; the exhaust unit 20 is shown in the first, second, and third figures, which includes an exhaust needle 30, a guide pin seat 40, and an elastic member 44; wherein the exhaust needle 30 is A rod-shaped body 31. The two ends of the body 31 are respectively set as a bottom cone 32 and a joint end 34. The bottom cone 32 is a flat-bottomed cone with an outer diameter significantly larger than the outer diameter of the body 31. The joint end 34 It can be in the shape of an external thread to cooperate with a lock cap 341 for screw-locking; and the guide pin base 40 is in the shape of a cone-shaped cylinder, and the outer side is a cone 41, the taper of which conforms to the push and fits tightly to the tire mold 10. The inner taper of the first air hole 121 is defined as a first end 411 at the end of the guide pin seat 40 with a larger outer diameter, and a second end 412 at the other end with a smaller outer diameter, wherein the end of the first end 411 faces the center A through groove 42 is recessed in the axial direction. The through groove 42 is opened with a tapered chamfered ring portion 421. The adjacent chamfered ring portion 421 is provided with a taper ring interface 422. The taper of the interface 422 corresponds to the bottom taper. The taper of the outside of 32, the inner diameter of the chamfered ring portion 421 is slightly larger than the outer diameter of the bottom cone portion 32 without contact, so that the inner side of the chamfered ring portion 421 and the outer side of the bottom cone portion 32 are formed as shown in the sixth figure. The relief 423 is a ring-shaped gap. As for the end surface of the second end 412 of the guide pin base 40, a hole 43 with a hole diameter smaller than the inner diameter of the through groove 42 is penetrated. The through hole 43 communicates with the through groove 42, and the through hole 43 can be cross-shaped. ; The elastic member 44 is pressed against the end surface of the second end 412 of the guide pin seat 40 When assembling, the body 31 of the exhaust needle 30 and the joint end 34 extend toward the opening of the through groove 42 of the guide pin base 40 until the joint end 34 passes through the through hole 43 for the elastic member 44 to pass through the outside, and The lock cap 341 is locked and combined with the coupling end 34, so that the two ends of the elastic member 44 abut against the second end 412 and the lock cap 341 of the guide pin base 40, respectively. It is placed in the exhaust hole 12, and the bottom taper portion 32 of the exhaust needle 30 abuts against the inner surface of the chamfered ring portion 421 of the guide pin seat 40, as shown in the first figure, this constitutes the exhaust unit 10 .

As shown in the first, third, and fourth figures, the exhaust units 20 of each group are extended and sleeved in the first air hole 121 of the tire mold 10 by the cone 41 of the guide pin seat 40, and the cone 41 and the first air hole 121 are mutually formed. The taper and tight fit design allow the exhaust unit 20 to be tightly fixed to the exhaust hole 12 of the tire mold 10 through the guide pin base 40, and the exhaust unit 20 extends beyond the second end 412 of the guide pin base 40 to the body 31, The end of the elastic member 44 penetrates into the first air hole 121 of the exhaust hole 12, and the bottom cone portion 32 is in contact with the interface 422 of the guide pin seat 40, so that each exhaust unit 20 is fixed to each row of the tire mold 10. In the air hole 12.

In use, the fourth diagram shows that the green tire 60 goes through the vulcanization process in the tire mold 10, that is, the green tire 60 gradually moves from the inside to the inner wall of the cavity 11 and pushes to the end of the inner wall of the cavity 11 Stage; Because the original creation installs the exhaust unit 20 in the mold cavity 11, during the vulcanization process, as shown in Figures 5 and 6, the air pressure in the mold cavity 11 is less than the elastic force of the elastic member, so the exhaust unit 20 does not When the exhaust action is not started, the bottom taper portion 32 and the interface 422 are in a bonded state, which means that the taper surface of the abutting taper portion 32 is in contact with the interface 422 of the guide pin seat 40.

When the raw tire 60 is continuously squeezed during the vulcanization process and moves into the mold cavity 11, the raw tire 60 also continues to squeeze the air in the mold cavity 11, and the compressed air due to the continuous reduction of the space occupied by the mold cavity 11 causes the air pressure Continue to rise and focus on the position of the relief 423 to generate a pushing force on the bottom cone 32 of the exhaust needle 30. Because the bottom cone 32 is tapered, and the exhaust needle 30 is only elastically positioned by the elastic member 44 Therefore, when the air pressure is greater than the elastic force of the elastic member 44, the component force of the air pressure pushes the bottom cone 32 to move toward the outside of the cavity 11 to compress the elastic member 44, resulting in the state shown in Figures 7 and 8. That is, the exhaust needle 30 moves toward the outside of the mold cavity 11 to cause the bottom cone portion 32 to retract from the interface 422 of the guide pin seat 40, forming a gap between the bottom cone portion 32 and the interface 422, and communicates with the through groove 42 and the through hole 43. An exhaust channel for the propelled air to exit the mold cavity 11 is formed, and the air is discharged out of the vent hole 12 of the mold cavity 11 through this pressure instantly. The air in the mold cavity 11 has been leaked out of the cavity 11 The air pressure is lower than the elastic member 44, and the elastic member 44 returns to elastically compress the exhaust needle 30 to move in the direction of the cavity 11 again, so that the bottom cone 32 contacts the interface 422 of the guide pin seat 40 to form a fit to avoid tires. The rubber material of 60 overflows through this, so that the green tire 60 is smoothly filled in the mold cavity 11 and formed as shown in the ninth and tenth figures; on the other hand, when the green tire is formed to contact the bottom cone portion 32, it will push the bottom The cone portion 32 moves toward the outside of the mold cavity 11 until the bottom cone portion 32 and the interface 422 fit together; as shown in Figure 11, it is a tire 70 made of a vulcanized raw tire 60, and the tread of the tire 70 There will be no overfilled rubber material with a significant protruding length on the 71, only a small inverted ring protrusion will be produced, and there will be no protruding lanugo. There is no need to manually remove the lanugo.

Please continue to refer to Figures 12 to 13, which is the second embodiment of the present invention. The exhaust holes 12 of each set of exhaust units 20 can be set as straight holes, and the cone of the straight cylindrical guide pin seat 40 41 is stretched into the first air hole 121 of the tire mold 10, using the barrel 41 and the first air hole 121 An air hole 121 is designed to fit each other tightly, so that the exhaust unit 20 is tightly fixed to the exhaust hole 12 of the tire mold 10 by the guide pin base 40, and the exhaust unit 20 extends beyond the second end 412 of the guide pin base 40 The portion 31 and the elastic member 44 penetrate into the first air hole 121 of the exhaust hole 12, so that each exhaust unit 20 is fixed in each exhaust hole 12 of the tire mold 10.

Based on the above, the whole disclosed by the present invention is indeed innovative, and its composition has not been seen in books or publicly used. It is in compliance with the requirements of an invention patent application. I sincerely ask Jun Bureau to approve the patent as soon as possible. I really pray.

If you need to clarify, the above are the specific embodiments of this creation and the technical principles used. If changes are made according to the concept of the present invention, the resulting functions and effects still do not exceed the spirit covered by the specification and drawings. Any time, they should all fall within the scope of the present invention, and they should be clearly stated.

10: Tire mold

11: Mould cavity

12: Vent

121: The first stomata

122: second stomata

20: Exhaust unit

30: Exhaust needle

31: Body

32: bottom cone

341: Lock Cap

40: guide pin seat

41: Cone

411: first end

412: second end

42: Through slot

44: Elastic

60: Raw Tire

Claims (4)

An exhaust structure for a tire mold includes: a tire mold with a mold cavity recessed inwardly on one side of the tire mold. The outer side surface is opposite to the tire tread and is provided with exhaust holes communicating with the mold cavity. The exhaust hole includes a first air hole; an exhaust unit for installing in the exhaust hole, which includes an exhaust needle, a guide pin seat, and an elastic member; wherein the exhaust needle is a rod-shaped The body, both ends of the body are respectively set as a bottom cone and a joint end, the bottom cone is a cone with an outer diameter larger than the outer diameter of the body, and the through groove of the guide pin seat is in the first The end face is expanded with a chamfered ring adjacent to the interface, the inner diameter of which is slightly larger than the outer diameter of the bottom cone and is not in contact, resulting in a gap between the inner side of the chamfered ring and the outer side of the bottom cone. A relief that forms an annular gap; the guide pin seat is used to be installed and fixed in the first air hole of the exhaust hole, and the guide pin seat includes two ends, a first end and a second end, respectively, The first end face is recessed with a through groove toward the central axis, the through groove is expanded with an interface at the open end, the taper of the inner side wall of the interface corresponds to the taper of the outer side of the bottom cone, and the second end penetrates A hole communicating with the through groove is provided for the body and the joint end of the vent needle to pass through the hole, and the elastic member is sleeved on the outer side of the body, so that one end of the elastic member is pressed against the first On the two ends, a lock cap is installed on the joint end to prevent the elastic member from dislocating; so that the vent needle is in the mold cavity forming process when the pressure in the mold cavity is greater than the elastic force of the elastic member , The air in the cavity has to push the vent needle to move to create a gap between the bottom cone and the interface to facilitate the air From between the interface and the bottom cone portion, the through groove, the perforation and out of the vent hole, when the pressure in the cavity is less than the elastic force of the elastic member, each of the bottom cone portion and the interface return to fit status. According to the venting structure of the tire mold according to the first item of the patent application, the inner wall surface of the first air hole of the tire mold is tapered, and the outer surface of the guide pin seat is set as a cone conforming to the shape of the inner wall surface of the first air hole On the other hand, the guide pin seat and the first air hole are arranged in a tight fit. According to the venting structure of the tire mold according to the first item of the scope of patent application, the inner wall surface of the first air hole of the tire mold is a straight hole, and the outer side surface of the guide pin seat is set to conform to the shape of the inner wall surface of the first air hole With a straight cylindrical surface, the guide pin seat and the first air hole are arranged in a tight fit. According to the vent structure of the tire mold according to the first item of the scope of patent application, the joint end of the vent needle is an external thread, and the lock cap is a nut.

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