A forming die for producing ethylene propylene diene rubber

Abstract

The application discloses a forming die for production of EPDM, and relates to the technical field of EPDM production, which comprises a bottom die, a female die is fixedly connected to the top surface of the bottom die, a cavity and a guide groove are formed in the top surface of the female die, a first piston rod is slidably sleeved in the guide groove, and a male die is fixedly connected to the top surface of the first piston rod. The application has the advantages that it can perform mold closing self-checking, avoid injection molding when the mold is not completely closed, prevent molten material splashing, reduce the risk of personnel injury, avoid raw material waste, greatly reduce cost loss, independently seal the injection molding runner, naturally connect each step without the participation of control elements, use the composite die in an environment, reduce the probability of mold damage, heat the injection molding ring, avoid temperature drop of the injection molding ring when the mold is opened, prevent the injection molding ring from being easily blocked, avoid affecting the operation of the injection molding machine, and further avoid material return and mold dredging.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of production of ethylene-propylene-diene rubber, and particularly relates to a forming die for production of ethylene-propylene-diene rubber. BACKGROUND

[0002] The production forming process of the ethylene-propylene-diene rubber mainly comprises stages of plasticizing, mixing, extruding and vulcanizing, the plasticizing is a process of making the rubber macromolecule undergo chain scission and oxidative cleavage through mechanical action, so that the raw rubber is converted from a tough elastic state to a soft and plastic state, the mixing is an important process in production of the ethylene-propylene-diene rubber product, which makes various mixing agents completely and uniformly dispersed in the raw rubber, and directly affects the product quality, the extruding is to extrude the mixed rubber through an extruder and form ethylene-propylene-diene rubber particles, and the forming of the ethylene-propylene-diene rubber is generally completed by an injection molding machine.

[0003] The production forming process of the ethylene-propylene-diene rubber is complex and has a high cost, and therefore the loss of raw materials needs to be specially considered in the production forming process.

[0004] According to the search, the Chinese patent application CN219819952U discloses a forming die for ethylene-propylene-diene rubber sealing gaskets, which has the advantages of being capable of being replaced according to production requirements, having good damping effect and high production efficiency, but the injection flow channel cannot be automatically closed when the die is opened, and the die does not have a self-checking mechanism for whether the die is completely closed, if the die is not completely closed and injection is performed, not only is there a risk of splashing of molten material, but also a large amount of raw materials is wasted, the cost loss is greatly increased, and meanwhile, the injection ring of the injection molding die is easy to be blocked, the blocking reason is mainly that the material in the injection ring is cooled, and therefore the temperature of the injection ring needs to be maintained during injection molding. SUMMARY

[0005] The application aims to provide a forming die for production of ethylene-propylene-diene rubber.

[0006] In order to solve the problems in the background, the application provides the following technical scheme: a forming die for production of ethylene-propylene-diene rubber, comprising a bottom die, a female die is fixedly connected to the top surface of the bottom die, a cavity and a guide groove are formed in the top surface of the female die, a first piston rod is slidably sleeved in the guide groove, a male die is fixedly connected to the top surface of the first piston rod, a top die is fixedly connected to the top surface of the male die, an injection flow channel is formed through the central axes of the top die and the male die, an embedding groove is formed in the inner surface of the injection flow channel, a closed ring groove is formed in the bottom wall of the embedding groove, a first closed cavity is formed in the side wall of the embedding groove, one end of a first gas guide pipe is communicated with the bottom surface of the closed ring groove, and the other end of the first gas guide pipe penetrates the bottom surface of the first piston rod.

[0007] The closed ring groove is sleeved with a ring-shaped piston, the top surface of the ring-shaped piston is fixedly connected with a top ring, one end of a branch pipe communicated with the outer surface of the first air duct, the other end of the branch pipe is communicated with a fixed cylinder, one end of a second piston rod is sleeved in the fixed cylinder, the other end of the second piston rod is fixedly connected with a sliding block, the end of the fixed cylinder and the bottom end of the closed ring groove are communicated with a connecting pipe, one end of a pull rope is fixedly connected with the side wall of the sliding block, the other end of the pull rope is fixedly connected with a rectangular piston, the outer surface of the pull rope is slidably connected with a guide wheel, the side wall of the rectangular piston is fixedly connected with a baffle, and a sliding groove is arranged in the male die.

[0008] As a further scheme of the present application, the guide groove and the first piston rod are provided with four, and the four guide grooves and the four first piston rods are respectively located at the four corners of the female die, and the guide groove and the first piston rod are one-to-one corresponding.

[0009] As a further scheme of the present application, the closed ring groove is communicated with the embedding groove, the first closed cavity is communicated with the embedding groove, the first air duct is one-to-one corresponding with the first piston rod, and a plurality of first air ducts are uniformly distributed about the central axis of the closed ring groove.

[0010] As a further scheme of the present application, the top ring extends into the embedding groove, the rectangular piston is sleeved with the first closed cavity, the baffle is embeddedly sleeved with the embedding groove, and the inner surface of the top ring is tightly attached to the inner surface of the closed ring groove.

[0011] As a further scheme of the present application, the guide wheel is rotatably sleeved with the male die, the sliding block is slidably sleeved with the sliding groove, a one-way valve is arranged between the connecting pipe and the fixed cylinder, the second piston rod drives the rectangular piston and the baffle to move through the sliding block and the pull rope, and the branch pipe is fixedly sleeved with the male die.

[0012] As a further scheme of the present application, a second closed cavity is arranged in the top die, a pressure rod is slidably sleeved with the top wall of the second closed cavity, a circular piston is fixedly connected with the bottom surface of the pressure rod, one end of a second air duct is communicated with the bottom surface of the second closed cavity, the other end of the second air duct is communicated with the end of the first closed cavity, a heating block is installed in the baffle, a first contact head is fixedly connected with the input end of the heating block, a second contact head is connected with the top surface of the first contact head, a wire is fixedly connected with the top surface of the second contact head, an injection molding ring is sleeved with the top end of the injection molding flow channel, a clamping block is clamped with the outer surface of the injection molding ring, and a reset spring is fixedly connected between the end surface of the clamping block and the top die.

[0013] As a further scheme of the present application, the bottom end of the second air duct is close to the sliding block, the top surface of the pressure rod is in contact with the end surface of the injection molding ring, and the clamping block is slidably sleeved with the top die.

[0014] As a further scheme of the present application: the first contact head extends to the top surface of the baffle, the second contact head is fixedly sleeved with the side wall of the embedding groove, and the wire extends to the top die.

[0015] By adopting the technical scheme, compared with the prior art, the present application has the beneficial effects that:

[0016] 1、The first piston rod end face gradually compresses the air in the guide groove, so that the compressed air flows into the closed annular groove through the first air guide pipe on the first piston rod, the air pressure at the bottom end of the closed annular groove rises, the annular piston in the closed annular groove rises, the top ring on the annular piston rises, and the top ring gradually seals the embedding groove, and further, as the compressed air flows into the first air guide pipe, the branch pipe on the first air guide pipe guides part of the compressed air into the fixed cylinder, the air pressure in the fixed cylinder rises and pushes the second piston rod to translate, the slider on the second piston rod pulls one end of the pull rope, the pull rope pulls the rectangular piston and the baffle downward under the guidance of the guide wheel, the baffle gradually shrinks into the first closed cavity, and the purpose of opening the injection flow channel is achieved.

[0017] 2、The first piston rod on the male die gradually separates from the guide groove, the air pressure in the guide groove decreases, the guide groove absorbs the air in the closed annular groove and the fixed cylinder through the first air guide pipe and the branch pipe, the reverse process is repeated, the top ring and the second piston rod reset, the pull rope is released from the restraint of the rectangular piston, and the initial translation of the rectangular piston compresses the air in the first closed cavity, so that the rectangular piston is always extruded by the compressed air, the rectangular piston is reset under the rebound of the compressed air, the baffle on the rectangular piston reseals the injection flow channel, the purpose of automatically closing the injection flow channel is achieved, the mold can naturally connect each step without the participation of control elements, the use environment of the composite mold is achieved, and the probability of mold damage is reduced.

[0018] 3、The application compresses the air in the second closed cavity through the circular piston, so that the compressed cavity enters the first closed cavity through the second air guide pipe, the air pressure in the first closed cavity is increased, the rectangular piston is continuously extruded, the sealing property of the baffle is guaranteed, the position of the baffle can be kept stable all the time when the sealing property of the baffle is kept, the first contact head and the second contact head on the baffle keep stable connection, the lead wire in the male die forms stable passage with the heating block, the heating block stably heats the injection molding ring, the temperature of the injection molding ring is prevented from falling when the mold is opened, the injection molding ring is prevented from being easily blocked, the work of the injection molding machine is prevented from being affected, and the material is prevented from being returned and the mold is prevented from being dredged. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a whole structure schematic view of the three- component ethylene propylene rubber production forming die of the application;

[0020] Figure 2 It is a half cut schematic view of the male die structure in the embodiment of the application;

[0021] Figure 3 It is a half cut schematic view of the male die structure in the embodiment of the application; Figure 2 It is an enlarged view of the structure of A part in the embodiment of the application;

[0022] Figure 4 It is a first air guide pipe structure schematic view in the embodiment of the application;

[0023] Figure 5 It is an enlarged view of the structure of B part in the embodiment of the application; Figure 4

[0024] Figure 6 It is a closed ring groove structure half cut schematic view in the embodiment of the application;

[0025] Figure 7 It is a clamping block structure schematic view in the embodiment of the application;

[0026] Figure 8 It is a fixed cylinder structure sectional view in the embodiment of the application;

[0027] Figure 9 It is a baffle structure sectional view in the embodiment of the application.

[0028] ​In the figure: 1, bottom die; 2, concave die; 3, cavity; 4, guide groove; 5, first piston rod; 6, convex die; 7, top die; 8, injection flow channel; 9, embedding groove; 10, closed ring groove; 11, first closed cavity; 12, first air guide pipe; 13, annular piston; 14, top ring; 15, branch pipe; 16, fixed cylinder; 17, second piston rod; 18, sliding block; 19, connecting pipe; 20, pull rope; 21, guide wheel; 22, rectangular piston; 23, baffle; 24, second closed cavity; 25, pressure rod; 26, circular piston; 27, second air guide pipe; 28, injection ring; 29, sliding groove; 30, clamping block; 31, return spring; 32, heating block; 33, first contact head; 34, second contact head; 35, wire. DETAILED DESCRIPTION

[0029] The specific embodiments of the present application will be further described below with reference to the drawings. It should be noted that the description of these embodiments is used to help understand the present application, but does not constitute a limitation on the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0030] Example 1

[0031] Referring to Figures 2-6 and Figure 8 , the present application provides a technical solution: a forming mold for producing ethylene-propylene-diene rubber, the annular piston 13 is slidably sleeved in the closed ring groove 10, the top surface of the annular piston 13 is fixedly connected with the top ring 14, one end of the branch pipe 15 is communicated with the outer surface of the first air guide pipe 12, the other end of the branch pipe 15 is communicated with the fixed cylinder 16, one end of the second piston rod 17 is slidably sleeved in the fixed cylinder 16, the other end of the second piston rod 17 is fixedly connected with the sliding block 18, the end of the fixed cylinder 16 and the bottom end of the closed ring groove 10 are communicated with the connecting pipe 19, one end of the pull rope 20 is fixedly connected with the side wall of the sliding block 18, the other end of the pull rope 20 is fixedly connected with the rectangular piston 22, the outer surface of the pull rope 20 is slidably connected with the guide wheel 21, the side wall of the rectangular piston 22 is fixedly connected with the baffle 23, and the sliding groove 29 is formed in the convex die 6.

[0032] Referring to Figure 3 and Figure 6 , the top ring 14 extends into the embedding groove 9, the rectangular piston 22 is slidably sleeved with the first closed cavity 11, the baffle 23 is embeddedly sleeved with the embedding groove 9, and the inner surface of the top ring 14 is tightly attached to the inner surface of the closed ring groove 10.

[0033] Referring to Figure 3 and Figure 5The guide wheel 21 is rotatably sleeved with the male die 6, the sliding block 18 is slidably sleeved with the sliding groove 29, the connecting pipe 19 is provided with a one-way valve between the fixed cylinder 16, the second piston rod 17 drives the rectangular piston 22 and the baffle 23 to move through the sliding block 18 and the pull rope 20, and the branch pipe 15 is fixedly sleeved with the male die 6.

[0034] Specifically, in the process of forming the ethylene-propylene-diene rubber, the mixed ethylene-propylene-diene rubber particles are put into an injection molding machine, and the bottom die 1 and the female die 2 are moved, so that the guide groove 4 on the female die 2 is matched with the first piston rod 5 on the male die 6, and the first piston rod 5 is gradually inserted into the guide groove 4. During this process, as the first piston rod 5 moves, the end face of the first piston rod 5 gradually compresses the air in the guide groove 4, so that the compressed air flows into the closed annular groove 10 through the first air guide pipe 12 on the first piston rod 5, so that the air pressure at the bottom end of the closed annular groove 10 rises, thereby causing the annular piston 13 in the closed annular groove 10 to rise, causing the top ring 14 on the annular piston 13 to rise, and further causing the top ring 14 to gradually close the embedded groove 9. It needs to be further explained that as the compressed air flows into the first air guide pipe 12, the branch pipe 15 on the first air guide pipe 12 will guide a part of the compressed air into the fixed cylinder 16, so that the air pressure in the fixed cylinder 16 rises and pushes the second piston rod 17 to translate, so that the sliding block 18 on the second piston rod 17 pulls one end of the pull rope 20, causing the pull rope 20 to pull the rectangular piston 22 and the baffle 23 to translate under the guidance of the guide wheel 21, causing the baffle 23 to gradually shrink into the first closed cavity 11, achieving the purpose of opening the injection flow channel 8. When the female die 2 and the male die 6 are completely closed, the first piston rod 5 completely enters the guide groove 4, and the injection flow channel 8 can be completely opened, and the top ring 14 completely seals the embedded groove 9. If the above conditions are not met, the baffle 23 cannot be completely shrunk, and the injection flow channel 8 cannot be unobstructed, so that the injection molding of the ethylene-propylene-diene rubber cannot be carried out, achieving the purpose of mold closing self-checking, avoiding injection molding when the mold is not completely closed, not only preventing the splashing of molten material and reducing the risk of personnel injury, but also avoiding the waste of raw materials and greatly reducing the loss of cost.

[0035] Example 2

[0036] Please refer to Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6The application provides a technical scheme: a forming die for production of ethylene propylene diene rubber, which comprises a bottom die 1, the top surface of the bottom die 1 is fixedly connected with a female die 2, the top surface of the female die 2 is provided with a cavity 3 and a guide groove 4, the first piston rod 5 is slidably connected in the guide groove 4, the top surface of the first piston rod 5 is fixedly connected with a male die 6, the top surface of the male die 6 is fixedly connected with a top die 7, the middle axis of the top die 7 and the male die 6 is provided with an injection flow channel 8, the inner surface of the injection flow channel 8 is provided with an embedding groove 9, the bottom wall of the embedding groove 9 is provided with a closed ring groove 10, the sidewall of the embedding groove 9 is provided with a first closed cavity 11, one end of a first air guide pipe 12 is communicated with the bottom surface of the closed ring groove 10, and the other end of the first air guide pipe 12 penetrates through the bottom surface of the first piston rod 5.

[0037] Please refer to Figure 1 and Figure 2 , the guide groove 4 and the first piston rod 5 are provided with four, and the four guide grooves 4 and the four first piston rods 5 are respectively located at the four corners of the female die 2, and the guide groove 4 and the first piston rod 5 correspond one by one.

[0038] Please refer to Figure 4 and Figure 6 , the closed ring groove 10 and the embedding groove 9 are communicated, the first closed cavity 11 and the embedding groove 9 are communicated, the first air guide pipe 12 and the first piston rod 5 correspond one by one, and a plurality of first air guide pipes 12 are uniformly distributed about the middle axis of the closed ring groove 10.

[0039] Specifically, in the process of opening the female die 2 and the male die 6, the first piston rod 5 on the male die 6 gradually separates from the guide groove 4, so that the air pressure in the guide groove 4 decreases, thereby the guide groove 4 absorbs the air in the closed ring groove 10 and the fixed cylinder 16 through the first air guide pipe 12 and the branch pipe 15, and the reverse repeats the above process, so that the top ring 14 and the second piston rod 17 reset, at this time, the restraint of the rectangular piston 22 by the pull rope 20 is removed, and the initial translation of the rectangular piston 22 will compress the air in the first closed cavity 11, so that the rectangular piston 22 is always extruded by the compressed air, at this time, the rectangular piston 22 which is released from the restraint will reset under the rebound of the compressed air, so that the baffle 23 on the rectangular piston 22 reseals the injection flow channel 8, the purpose of automatically closing the injection flow channel 8 is achieved, the mold can complete the natural connection of each step without the participation of control elements, the use environment of the composite die is reduced, and the probability of mold damage is reduced.

[0040] Example 3

[0041] Please refer to Figure 3 , Figure 6 , Figure 7 and Figure 9The application provides a technical scheme: a forming die for EPDM production, a second closed cavity 24 is arranged in a top die 7, a pressure rod 25 is slidably connected to the top wall of the second closed cavity 24, a circular piston 26 is fixed to the bottom surface of the pressure rod 25, one end of a second gas guide pipe 27 is communicated with the bottom surface of the second closed cavity 24, the other end of the second gas guide pipe 27 is communicated with the end of a first closed cavity 11, a heating block 32 is arranged in a baffle 23, a first contact head 33 is fixed to the input end of the heating block 32, a second contact head 34 is connected to the top surface of the first contact head 33, a wire 35 is fixed to the top surface of the second contact head 34, an injection molding ring 28 is arranged at the top end of an injection molding channel 8, a clamping block 30 is clamped to the outer surface of the injection molding ring 28, and a reset spring 31 is fixed between the end surface of the clamping block 30 and the top die 7.

[0042] Please refer to Figure 3 and Figure 6 , the bottom end of the second gas guide pipe 27 is close to the sliding block 18, the top surface of the pressure rod 25 is in contact with the end surface of the injection molding ring 28, and the clamping block 30 is slidably connected to the top die 7.

[0043] Please refer to Figure 9 , the first contact head 33 extends to the top surface of the baffle 23, the second contact head 34 is fixedly connected to the side wall of the embedded groove 9, and the wire 35 extends to the outside of the top die 7.

[0044] Specifically, during the installation of the injection molding ring 28, the injection molding ring 28 is placed at the top end of the injection molding channel 8, and the injection molding ring 28 is pressed downward to the top end of the pressure rod 25, so that the pressure rod 25 drives the circular piston 26 to descend, the circular piston 26 compresses the air in the second closed cavity 24, so that the compressed cavity enters the first closed cavity 11 through the second gas guide pipe 27, the air pressure in the first closed cavity 11 is increased, so that the rectangular piston 22 is continuously extruded, and the sealing property of the baffle 23 is ensured, and when the sealing property of the baffle 23 is maintained, the position of the baffle 23 can always be kept stable, so that the first contact head 33 and the second contact head 34 on the baffle 23 are stably connected, the wire 35 in the convex die 6 forms a stable passage with the heating block 32, the heating block 32 stably heats the injection molding ring 28, the temperature of the injection molding ring 28 does not easily drop when the mold is opened, the injection molding ring 28 is not easy to be blocked, the work of the injection molding machine is not affected, and then the material is not returned and the mold is not dredged.

[0045] The working principle and use process of the present application: when the ethylene propylene terpolymer needs to be formed, the mixed ethylene propylene terpolymer particles are put into the injection molding machine, and the bottom die 1 and the concave die 2 are moved, so that the guide groove 4 on the concave die 2 is matched with the first piston rod 5 on the convex die 6, and the first piston rod 5 is gradually inserted into the guide groove 4. During this process, as the first piston rod 5 moves, the end face of the first piston rod 5 gradually compresses the air in the guide groove 4, so that the compressed air flows into the closed ring groove 10 through the first air pipe 12 on the first piston rod 5, so that the air pressure at the bottom end of the closed ring groove 10 rises, thereby making the annular piston 13 in the closed ring groove 10 rise, making the top ring 14 on the annular piston 13 rise, and then making the top ring 14 gradually close the embedded groove 9. It needs to be further explained that as the compressed air flows into the first air pipe 12, the branch pipe 15 on the first air pipe 12 will guide a part of the compressed air into the fixed cylinder 16, so that the air pressure in the fixed cylinder 16 rises and pushes the second piston rod 17 to translate, so that the slider 18 on the second piston rod 17 pulls one end of the pull rope 20, so that the pull rope 20 pulls the rectangular piston 22 and the baffle 23 in the direction of the guide wheel 21. The translation makes the baffle 23 gradually shrink into the first closed cavity 11, so as to achieve the purpose of opening the injection flow channel 8. When the concave die 2 and the convex die 6 are completely closed, the first piston rod 5 completely enters the guide groove 4, and the injection flow channel 8 can be completely opened. At the same time, the top ring 14 completely seals the embedded groove 9. If the above conditions are not met, the baffle 23 cannot be completely shrunk, and the injection flow channel 8 cannot be smooth, so that the injection molding of the ethylene propylene terpolymer cannot be carried out, so as to achieve the purpose of mold self-checking, avoid injection molding when the mold is not completely closed, not only prevent the splashing of molten material and reduce the risk of personnel injury, but also avoid the waste of raw materials and greatly reduce the loss of cost.

[0046] When the ethylene propylene terpolymer injection molding is completed and cooled, the concave die 2 and the convex die 6 are controlled to be opened, so that the first piston rod 5 on the convex die 6 gradually separates from the guide groove 4, so that the air pressure in the guide groove 4 decreases, thereby making the guide groove 4 absorb the air in the closed ring groove 10 and the fixed cylinder 16 through the first air pipe 12 and the branch pipe 15. Reverse repeat the above process, so that the top ring 14 and the second piston rod 17 reset. At this time, the pull rope 20 releases the restraint of the rectangular piston 22, and the initial stage translation of the rectangular piston 22 will compress the air in the first closed cavity 11, so that the rectangular piston 22 is always extruded by the compressed air. At this time, the rectangular piston 22 which is released from the restraint will reset under the rebound of the compressed air, so that the baffle 23 on the rectangular piston 22 reseals the injection flow channel 8, so as to achieve the purpose of automatically closing the injection flow channel 8, so that the mold can complete the natural connection of each step without the participation of control elements, the use environment of the composite mold, and the probability of mold damage is reduced.

[0047] Further, during the installation of the injection ring 28, the injection ring 28 is put into the top end of the injection flow channel 8, and the injection ring 28 is pressed down to the top end of the pressing rod 25, so that the pressing rod 25 pushes the circular piston 26 to descend, and the circular piston 26 compresses the air in the second sealed cavity 24, so that the compressed cavity enters the first sealed cavity 11 through the second air guide pipe 27, and the air pressure in the first sealed cavity 11 is increased, so as to continuously extrude the rectangular piston 22, and ensure the sealing of the baffle 23;

[0048] When the baffle 23 keeps the sealing, the position of the baffle 23 can be kept stable, so that the first contact head 33 and the second contact head 34 on the baffle 23 keep stable connection, the lead wire 35 in the punch 6 forms a stable passage with the heating block 32, and then the heating block 32 stably heats the injection ring 28, avoids the temperature drop of the injection ring 28 when the mold is opened, avoids that the injection ring 28 is easily blocked, avoids affecting the work of the injection molding machine, and then avoids the material return and the dredging of the mold, and the operation is completed.

[0049] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the described embodiments. For those skilled in the art, various changes, modifications, replacements and variations of the embodiments can be made without departing from the principles and spirits of the present application, and still fall within the protection scope of the present application.

Claims

1. A molding die for producing EPDM rubber, characterized in that, The system includes a bottom mold (1), a concave mold (2) fixedly connected to the top surface of the bottom mold (1), a cavity (3) and a guide groove (4) opened on the top surface of the concave mold (2), a first piston rod (5) slidably sleeved in the guide groove (4), a punch (6) fixedly connected to the top surface of the first piston rod (5), a top mold (7) fixedly connected to the top surface of the punch (6), an injection runner (8) passing through the central axis of the top mold (7) and the punch (6), a groove (9) opened on the inner surface of the injection runner (8), a sealed annular groove (10) opened in the bottom wall of the groove (9), and a first sealed cavity (11) opened on the side wall of the groove (9), and a first air guide pipe (12) connected to the bottom surface of the sealed annular groove (10), and the other end of the first air guide pipe (12) passing through the bottom surface of the first piston rod (5); An annular piston (13) is slidably sleeved in the sealed annular groove (10). A top ring (14) is fixedly connected to the top surface of the annular piston (13). One end of a branch pipe (15) is connected to the outer surface of the first air guide pipe (12). The other end of the branch pipe (15) is connected to a fixed cylinder (16). One end of a second piston rod (17) is slidably sleeved in the fixed cylinder (16). A slider (18) is fixedly connected to the other end of the second piston rod (17). A connecting pipe (19) is connected between the end of the fixed cylinder (16) and the bottom end of the sealed annular groove (10). One end of a pull rope (20) is fixedly connected to the side wall of the slider (18). A rectangular piston (22) is fixedly connected to the other end of the pull rope (20). A guide wheel (21) is slidably connected to the outer surface of the pull rope (20). A baffle (23) is fixedly connected to the side wall of the rectangular piston (22). A sliding groove (29) is opened in the punch (6). The top mold (7) has a second sealed cavity (24) inside. A pressure rod (25) is slidably sleeved on the top wall of the second sealed cavity (24). A circular piston (26) is fixedly connected to the bottom surface of the pressure rod (25). One end of the second air guide pipe (27) is connected to the bottom surface of the second sealed cavity (24). The other end of the second air guide pipe (27) is connected to the end of the first sealed cavity (11). A heating block (32) is installed inside the baffle (23). A first contact head (33) is fixedly connected to the input end of the heating block (32). A second contact head (34) is connected to the top surface of the first contact head (33). A wire (35) is fixedly connected to the top surface of the second contact head (34). An injection ring (28) is sleeved on the top end of the injection channel (8). A locking block (30) is snapped onto the outer surface of the injection ring (28). A return spring (31) is fixedly connected between the end face of the locking block (30) and the top mold (7).

2. The molding die for producing EPDM rubber according to claim 1, characterized in that: The guide groove (4) and the first piston rod (5) are each provided with four, and the four guide grooves (4) and the four first piston rods (5) are respectively located at the four corners of the die (2), and the guide grooves (4) and the first piston rods (5) correspond one-to-one.

3. The molding die for producing EPDM rubber according to claim 1, characterized in that: The sealed annular groove (10) is connected to the groove (9), the first sealed cavity (11) is connected to the groove (9), the first air guide tube (12) corresponds to the first piston rod (5) one by one, and the multiple first air guide tubes (12) are evenly distributed about the central axis of the sealed annular groove (10).

4. The molding die for producing EPDM rubber according to claim 1, characterized in that: The top ring (14) extends into the groove (9), the rectangular piston (22) is slidably sleeved with the first sealed cavity (11), the baffle (23) is fitted into the groove (9), and the inner surface of the top ring (14) is in close contact with the inner surface of the sealed ring groove (10).

5. A molding die for producing EPDM rubber according to claim 1, characterized in that: The guide wheel (21) is rotatably sleeved with the punch (6), the slider (18) is slidably sleeved with the groove (29), a one-way valve is provided between the connecting pipe (19) and the fixed cylinder (16), the second piston rod (17) drives the rectangular piston (22) and the baffle (23) to move through the slider (18) and the pull rope (20), and the branch pipe (15) is fixedly sleeved with the punch (6).

6. The molding die for producing EPDM rubber according to claim 1, characterized in that: The bottom end of the second air guide tube (27) is close to the slider (18), the top surface of the pressure rod (25) is in contact with the end face of the injection ring (28), and the locking block (30) is slidably sleeved with the top mold (7).

7. A molding die for producing EPDM rubber according to claim 1, characterized in that: The first contact head (33) extends to the outside of the top surface of the baffle (23), the second contact head (34) is fixedly sleeved with the side wall of the groove (9), and the wire (35) extends to the outside of the top mold (7).

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