Rubber injection molding mold

Abstract

The utility model relates to the technical field of molds, in particular to a rubber injection molding mold which comprises an upper mold plate, a middle mold plate, a lower mold plate, an upper mold core, a lower mold core and a sprue, the upper mold plate, the middle mold plate and the lower mold plate are sequentially connected in an abutting mode, the upper mold core is arranged at the bottom of the upper mold plate, the lower mold core is arranged at the top of the lower mold plate, and the sprue is arranged in the middle mold plate. A first mold cavity is defined by the upper mold plate, the middle mold plate and the upper mold core, a second mold cavity is defined by the lower mold plate, the middle mold plate and the lower mold core, a runner is arranged between the upper mold core and the lower mold core, the first mold cavity is communicated with the second mold cavity through the runner, the sprue is communicated with the runner, and the sprue is communicated with the runner. Through the split design of the upper cavity and the lower cavity, the runner is arranged between the two groups of rubber workpieces, runner waste is reasonably reduced, material waste is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, and more specifically, to a rubber injection molding mold. Background Art

[0002] Vulcanization compression molding molds for rubber accessories are mostly disc-type single-cavity structures. The surface is complex and difficult to process. The mold precision requirements are high and the research and assembly are cumbersome. The following defects are common in the mold production process: 1. The rubber flows too fast at the mold parting surface, and the product density is poor; 2. The mold undercut cavity design is not ideal, and the product is difficult to demold.

[0003] Patent CN219171519U discloses a novel double-layer rubber pad injection mold, comprising a runner plate, an upper mold plate, a middle mold plate, a lower mold plate, multiple movable plates, and multiple ejector pins. The multiple movable plates are detachably mounted in corresponding mounting slots on the middle mold plate, forming multiple rubber cavities on the upper and lower sides of the movable plates. Each movable plate has an ejector pin at each of the four corners of the bottom, mounted in the four corners of the mounting slot. The middle mold plate is also provided with spring hooks for retaining the movable plates within the mounting slots. By arranging multiple movable plates on the middle mold plate, the upper, middle, and lower mold plates cooperate to form two layers of multiple rubber cavities above and below the movable plates. This allows for the simultaneous injection production of multiple rubber pads, improving production efficiency and yield. By properly controlling the amount of glue fed and the operating pressure, rubber flash can be better controlled, resulting in a denser product and a higher yield rate. The cooperation of the ejector pins and spring hooks prevents demolding difficulties. However, the aforementioned solution suffers from a large number of runners and a complex structure, resulting in a significant amount of runner waste and material waste. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art of large flow channel waste and great material waste, and to provide a rubber injection molding die, which can reduce the flow channel waste of the produced rubber parts and reduce the production cost.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A rubber injection molding mold is provided, comprising an upper template, a middle template, a lower template, an upper core, a lower core and a nozzle, the upper template, the middle template and the lower template are abutted in sequence, the upper core is arranged at the bottom of the upper template, the lower core is arranged at the top of the lower template, a first cavity is formed between the upper template, the middle template and the upper core, a second cavity is formed between the lower template, the middle template and the lower core, a runner is provided between the upper core and the lower core, the first cavity and the second cavity are connected through the runner, and the nozzle is connected to the runner.

[0007] The rubber injection molding die of the utility model controls the closing of the upper mold plate, the middle mold plate and the lower mold plate to form a first cavity and a second cavity, injects rubber material into the runner through a nozzle, and then simultaneously injects it into the first cavity and the second cavity through the runner. After the rubber material fills the first cavity and the second cavity, two groups of upper and lower rubber parts are manufactured; only one group of runner waste located between the two groups of rubber parts is generated, thereby reducing material waste and lowering production costs.

[0008] Furthermore, a first groove is provided on the bottom surface of the upper mold core, and a second groove is provided on the top surface of the lower mold core. The runner is formed by splicing the first and second grooves. A first tearing edge is provided at the connection between the first cavity and the runner, and a second tearing edge is provided at the connection between the second cavity and the runner. Forming the runner by splicing the first and second grooves simplifies the mold structure. The first and second tearing edges create an easily tearable fracture zone between the two sets of rubber parts, facilitating the removal of flash between the two sets of rubber parts.

[0009] Furthermore, the first and second cavities are mirror-image symmetrical with respect to the runner, which is a centrally symmetrically distributed, diverging conduit. The nozzle passes through the upper mold plate and the upper core and communicates with the center of the runner. The symmetry of the first and second cavities ensures equal filling speeds for the first and second cavities, preventing overflow of material from one cavity while the other remains unfilled. The centrally symmetrical distribution of the runners synchronizes the glue feed speeds of each runner, ensuring equal filling speeds for the first and second cavities at all circumferential locations, preventing overflow of material from certain locations while others remain unfilled, thereby reducing waste.

[0010] Furthermore, the first cavity is connected to a third tear-off opening, and the second cavity is connected to a fourth tear-off opening. The third tear-off opening is located at the junction of the upper mold plate and the middle mold plate, and the fourth tear-off opening is located at the junction of the lower mold plate and the middle mold plate. The third and fourth tear-off openings are connected to the outside world. As the rubber fills the first and second cavities, the rubber squeezes the air in the first and second cavities out of the mold through the third and fourth tear-off openings, respectively, to prevent bubbles from forming in the rubber part, improve the compactness of the rubber part, eliminate the need to extract the mold plate for venting, and avoid damage to the mold plate caused by repeated pressing and venting. At the same time, the third and fourth tear-off openings make it easier to remove the flash on the top of the rubber part.

[0011] Furthermore, the upper core is provided with a first vent groove and a first vent hole, and the lower core is provided with a second vent groove and a second vent hole. One end of the first vent groove is connected to the first cavity and the other end is connected to the first vent hole. One end of the second vent groove is connected to the second cavity and the other end is connected to the second vent hole. The first vent hole passes through the upper core and the upper template and is connected to the outside world, and the second vent hole passes through the lower core and the lower template and is connected to the outside world. Gas that is not squeezed out of the third and fourth tearing edges can be discharged, thereby avoiding air entrapment and bubbling during the curing process and improving the density of the rubber part.

[0012] Furthermore, the middle template includes a first middle template, a second middle template, and a third middle template, which are connected in sequence from top to bottom, and a retractable suspension member is connected between the first and second middle templates, and between the second and third middle templates. During demolding, the lower template is kept in place, the height of the first middle template is raised, and under the influence of the template's own weight, the suspension member extends, separating the first, second, and third middle templates connected in series from each other. The two groups of rubber parts and the runner conjoined body in the middle template are simultaneously pulled away from the lower core, and the two groups of rubber parts are manually pulled out of the middle template using air gun-assisted blowing.

[0013] The suspension components include contour sleeves and contour screws. The contour screws slide within the contour sleeves. The second template is provided with two sets of screw holes, arranged one above the other. The two sets of contour screws engage with the two sets of screw holes, respectively. The two sets of contour sleeves are fixed to the first and third templates, respectively. The contour screws slide within the contour sleeves, changing the distance between the first, second, and third templates, merging or opening the templates and achieving inverted demolding of the product.

[0014] Furthermore, compressed elastic members are provided between the first and second middle templates, and between the second and third middle templates. The elastic members facilitate separation of the first, second, and third middle templates, allowing for rapid opening of the templates and quick undercut demolding of the rubber part.

[0015] Furthermore, a positioning mechanism is included to assist in mold closing. With the help of the positioning mechanism, the upper mold plate, the middle mold plate and the lower mold plate are assembled together in an accurate position to avoid the shape of the first cavity or the second cavity not meeting the requirements and reducing the quality of the rubber part.

[0016] Furthermore, the positioning mechanism includes a guide post, a guide sleeve, and a guide post. The guide post is fixedly arranged on the opposing surfaces of the upper template and the lower template. The middle template is provided with a plurality of guide holes. The guide holes and the guide posts are clearance-matched. The diameter of the guide holes is larger than the diameter of the guide post. The guide post is fixedly connected to the upper template, the first middle template, the lower template, and the third middle template. The guide sleeve is fixed in the first middle template, the second middle template, and the third middle template. The guide post is in contact with the inner wall of the guide sleeve. When closing the mold, the guide post is inserted into the guide hole for preliminary positioning. Then, the distance between the upper template, the lower template, and the middle template is slowly changed so that the guide post is gradually inserted into the guide sleeve for precise positioning until the mold closing is completed.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The rubber injection molding die of the utility model adopts an upper and lower double-cavity parting design, arranges the runner in the middle of two groups of rubber parts, and simultaneously feeds the rubber from the middle, reasonably reduces runner waste, reduces material waste, and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the rubber injection molding die of the present invention at the mold closing stage;

[0020] Figure 2 This is a schematic structural diagram of the rubber injection molding die of the present invention at the mold opening stage;

[0021] Figure 3 This is a schematic structural diagram of the rubber injection molding die of the present invention in the removal state;

[0022] Figure 4 This is an axonometric exploded view of the rubber injection molding die of the present invention;

[0023] Figure 5 This is a three-dimensional structural diagram of the rubber injection molding die of the present invention at the mold closing stage.

[0024] In the accompanying drawings: 1. Upper template; 11. Nozzle; 111. Nozzle pressure ring; 12. Locking mold foot; 2. Lower template; 3. Upper core; 4. Lower core; 5. Runner; 51. First groove; 6. Middle template; 61. First middle template; 611. Boosting block; 62. Second middle template; 621. Screw hole; 63. Third middle template; 64. Hanging part; 641. Contour sleeve; 642. Contour screw; 643. Elastic part; 7. First cavity; 71. First tear edge; 72. Third tear edge; 73. Fifth tear edge; 8. Second cavity; 9. Positioning mechanism; 91. Guide column; 92. Guide hole; 93. Guide column; 94. Guide sleeve; 10. Rubber part; 110. First exhaust groove; 1101. First exhaust hole; 1102. Exhaust outlet. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic, not actual, representations. They should not be construed as limiting this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted from the drawings.

[0026] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and so on indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] Example 1

[0028] like Figures 1 to 5The figure shows the first embodiment of the rubber injection molding mold of the present invention, which provides a rubber injection molding mold, including an upper template 1, a middle template 6, a lower template 2, an upper core 3, a lower core 4 and a nozzle 11. The upper template 1, the middle template 6 and the lower template 2 are abutted in sequence, the upper core 3 is arranged at the bottom of the upper template 1, and the lower core 4 is arranged at the top of the lower template 2. A first cavity 7 is formed between the upper template 1, the middle template 6 and the upper core 3, and a second cavity 8 is formed between the lower template 2, the middle template 6 and the lower core 4. A runner 5 is provided between the upper core 3 and the lower core 4, the first cavity 7 and the second cavity 8 are connected through the runner 5, and the nozzle 11 is connected to the runner 5.

[0029] The rubber injection molding mold of the present invention controls the closing of the upper template 1, the middle template 6 and the lower template 2, injects the rubber into the runner 5 through the nozzle 11, and then simultaneously injects it into the first cavity 7 and the second cavity 8 through the runner 5. After the rubber fills the first cavity 7 and the second cavity 8, two groups of upper and lower rubber parts 10 are manufactured; compared with ordinary film pressing, injection molding through the nozzle 11 can better control the rubber process flash by reasonably controlling the amount of glue fed and the working pressure, and the product density is better and the qualified rate is higher; only one group of runner 5 waste located between the two groups of rubber parts 10 is generated, which reduces material waste and reduces production costs. In this embodiment, the first cavity 7 and the second cavity 8 each have a cavity, and two rubber parts 10 can be produced by one injection, such as Figure 2 shown.

[0030] The horizontal side surfaces of the upper template 1 and the lower template 2 are also fixed with a locking presser foot 12 for fixing the upper template 1 and the lower template 2. The locking presser foot 12 is provided with a locking groove. When installing the mold on the machine, screws and other fixing parts are passed through the locking groove and nailed into the machine to tighten the locking presser foot 12, thereby fixing the upper template 1 and the lower template 2.

[0031] When closing the mold, keep the upper template 1 stationary, and the machine cylinder drives the lower template 2 to move upward, thereby driving the middle template 6 and the lower core 4 to move upward until the upper template 1, the middle template 6 and the lower template 2 are merged. Figure 1 and Figure 5 shown.

[0032] The bottom surface of the upper mold core 3 is provided with a first groove 51, and the top surface of the lower mold core 4 is provided with a second groove. The runner 5 is formed by combining the first groove 51 and the second groove. A first tearing edge 71 is provided at the connection between the first mold cavity 7 and the runner 5, and a second tearing edge 71 is provided at the connection between the second mold cavity 8 and the runner 5. Forming the runner 5 by combining the first groove 51 and the second groove simplifies the mold structure. The first tearing edge 71 and the second tearing edge create an easily tearable fracture zone between the two sets of rubber parts 10, facilitating the removal of flash between the two sets of rubber parts 10.

[0033] The first cavity 7 and the second cavity 8 are mirror-symmetrical relative to the runner 5. The runner 5 is a divergent pipe with a centrally symmetrical distribution. The nozzle 11 passes through the upper mold plate 1 and the upper core 3 and is connected to the center of the runner 5. The first cavity 7 is symmetrical with the second cavity 8, so that the filling speeds of the first cavity 7 and the second cavity 8 are equal, avoiding the overflow of the rubber material in one group of cavities while the other group of cavities is not yet filled; the runner 5 is centrally symmetrically distributed, so that the glue feeding speeds of each runner 5 are synchronized, and the rubber filling speeds of the first cavity 7 and the second cavity 8 at each circumferential position are equal, avoiding the overflow of the rubber material at individual positions while other positions are not yet filled, thereby reducing rubber waste. A nozzle pressure ring 111 is also provided on the top of the nozzle 11 to prevent the nozzle 11 from detaching.

[0034] The first mold cavity 7 is connected to a third tear-off opening 72, and the second mold cavity 8 is connected to a fourth tear-off opening. The third tear-off opening 72 is located at the junction of the upper mold plate 1 and the middle mold plate 6, and the fourth tear-off opening is located at the junction of the lower mold plate 2 and the middle mold plate 6. The third tear-off opening 72 and the fourth tear-off opening are connected to the outside world. As the rubber fills the first mold cavity 7 and the second mold cavity 8, the rubber squeezes the air in the first mold cavity 7 and the second mold cavity 8 out of the mold through the third tear-off opening 72 and the fourth tear-off opening, respectively, to avoid the formation of bubbles in the rubber part 10, improve the density of the rubber part 10, and eliminate the need to extract the mold plate for exhaust, thus avoiding damage to the mold plate caused by repeated pressing and exhausting. At the same time, the third tear-off opening 72 and the fourth tear-off opening can make it easier to remove the flash on the top of the rubber part 10.

[0035] The upper core 3 is provided with a first exhaust groove 110 and a first exhaust hole 1101, and the lower core 4 is provided with a second exhaust groove and a second exhaust hole. One end of the first exhaust groove 110 is connected to the first cavity 7, and the other end is connected to the first exhaust hole 1101. One end of the second exhaust groove is connected to the second cavity 8, and the other end is connected to the second exhaust hole. The first exhaust hole 1101 passes through the upper core 3 and the upper template 1 and is connected to the outside world, and the second exhaust hole passes through the lower core 4 and the lower template 2 and is connected to the outside world. The gas that is not squeezed out of the third tear edge 72 and the fourth tear edge can be discharged to avoid air entrapment and bubbling during the curing process, thereby improving the density of the rubber part 10. The side walls of the upper template 1 and the lower template 2 are provided with an exhaust outlet 102. The airflow entering the first exhaust hole 101 and the second exhaust hole passes through the air flow channel inside the core and the template and is discharged to the outside world from the exhaust outlet 102. The first venting groove 110 and the second venting groove are symmetrical to each other, and both have diameters of 0.1 to 0.2 mm, so as to prevent excessive rubber from being lost through the venting groove 110 .

[0036] In this embodiment, the runner 5 is cross-shaped, dividing the end faces of the upper core 3 and the lower core 4 into four equally divided fan-shaped surfaces, and the four exhaust grooves 110 are respectively opened on the four fan-shaped surfaces; the four end openings of the cross-shaped runner 5 are enlarged, and the process of the rubber material entering the first cavity 7 and the second cavity 8 from the runner 5 is smoother.

[0037] Example 2

[0038] This embodiment is the second embodiment of the rubber injection molding die of the present invention. This embodiment is similar to the first embodiment, except that the middle template 6 includes a first middle template 61, a second middle template 62 and a third middle template 63. The first middle template 61, the second middle template 62 and the third middle template 63 are connected in sequence from top to bottom. In the mold closing state, the first middle template 61, the second middle template 62 and the third middle template 63 are closely attached to each other. A retractable suspension member 64 is connected between the first middle template 61 and the second middle template 62 and the second middle template 62 and the third middle template 63. Figures 1 to 4 shown.

[0039] A fifth tearing edge 73 is further provided on the two parting surfaces between the first middle template 61 , the second middle template 62 and the third middle template 63 .

[0040] During demoulding, the position of the lower template 2 remains unchanged, and the height of the first middle template 61 is raised. Under the influence of the template's own weight, the hanging piece 64 extends, and the first middle template 61, the second middle template 62 and the third middle template 63, which are connected in series, are separated from each other. The two rubber parts 10 and the runner conjoined body in the middle template 6 are simultaneously pulled away from the lower core 4. With the help of air gun blowing, the double-cavity rubber part 10 is manually pulled out of the middle template 6. Figure 2 and Figure 3 shown.

[0041] Protruding boosting blocks 611 are fixedly provided on two opposite sides of the first middle template 61 . The machine pushes the boosting blocks 611 upwards to lift the first middle template 61 and open the middle template 6 .

[0042] The hanging member 64 includes a contour sleeve 641 and contour screws 642. Specifically, the hanging member 64 is a cylinder of the contour sleeve 641, and the contour screws 642 are slidably mounted within the contour sleeve 641. The second middle template 62 is provided with two sets of screw holes 621 arranged vertically. The two sets of contour screws 642 respectively engage with the two sets of screw holes 621. The two sets of contour sleeves 641 are respectively fixed to the first middle template 61 and the third middle template 63. The contour screws 642 slide within the contour sleeve 641, changing the distance between the first middle template 61, the second middle template 62, and the third middle template 63, thereby merging or opening the middle templates 6 and achieving inverted demolding of the product.

[0043] Any suspension member 64 that can realize the stacking of the first middle template 61, the second middle template 62 and the third middle template 63 in series and enables the middle template 6 to be hung in a split state when the mold is opened is applicable to the present invention. The suspension member 64 listed in this embodiment is not intended to limit the present invention.

[0044] A compressed elastic member 643 is further provided between the first middle template 61 and the second middle template 62, and between the second middle template 62 and the third middle template 63. The elastic member 643 can make it easier for the first middle template 61, the second middle template 62 and the third middle template 63 to separate from each other, allowing the middle template 6 to open quickly and quickly realize the inverted demoulding of the rubber part 10. In this embodiment, the elastic member 643 is a compression spring, which is sleeved on the equal height sleeve 641. One end of the spring is fixedly connected to the first middle template 61 or the third middle template 63, and the other end is fixedly connected to the second middle template 62. Figure 4 shown.

[0045] Example 3

[0046] This third embodiment of the rubber injection molding mold of the present invention is similar to the second embodiment, except that it further includes a positioning mechanism 9 for assisting mold closing. This positioning mechanism 9 assists in accurately aligning the upper mold plate 1, the middle mold plate 6, and the lower mold plate 2, preventing the shape of the first cavity 7 or the second cavity 8 from not meeting the requirements and thereby reducing the quality of the rubber part 10.

[0047] The positioning mechanism 9 includes a guide column 93 for fine positioning, a guide sleeve 94 and a guide column 91 for rough positioning. The guide column 91 is fixed on the opposite surfaces of the upper template 1 and the lower template 2. A plurality of guide holes 92 are provided in the middle template 6. The guide holes 92 and the guide columns 91 are clearance-matched. The diameter of the guide holes 92 is larger than the diameter of the guide columns 91. The guide columns 93 are fixedly connected to the upper template 1, the first middle template 61, the lower template 2 and the third middle template 63. The guide sleeve 94 is fixed in the first middle template 61, the second middle template 62 and the third middle template 63. The guide column 93 fits the inner wall of the guide sleeve 94. When closing the mold, the guide column 91 is inserted into the guide hole 92 for preliminary positioning. Then, the distance between the upper template 1, the lower template 2 and the middle template 6 is slowly changed so that the guide column 93 is gradually inserted into the guide sleeve 94 for precise positioning until the mold closing is completed. Figure 4 shown.

[0048] Any positioning mechanism 9 that can assist in precise mold closing of each template can be used in the present invention, such as using the guide pin 93 and the guide sleeve 94 alone for positioning. The positioning mechanism 9 listed in this embodiment is not intended to limit the present invention.

[0049] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A rubber injection molding mold, characterized in that, The invention comprises an upper template (1), a middle template (6), a lower template (2), an upper core (3), a lower core (4) and a nozzle (11); the upper template (1), the middle template (6) and the lower template (2) are abutted in sequence; the upper core (3) is arranged at the bottom of the upper template (1); the lower core (4) is arranged at the top of the lower template (2); a first cavity (7) is formed between the upper template (1), the middle template (6) and the upper core (3); a second cavity (8) is formed between the lower template (2), the middle template (6) and the lower core (4); a flow channel (5) is provided between the upper core (3) and the lower core (4); the first cavity (7) and the second cavity (8) are communicated through the flow channel (5); and the nozzle (11) is communicated with the flow channel (5).

2. The rubber injection molding die according to claim 1, characterized in that: A first groove (51) is provided on the bottom surface of the upper mold core (3), a second groove is provided on the top surface of the lower mold core (4), the flow channel (5) is formed by splicing the first groove (51) and the second groove, a first tearing edge opening (71) is provided at the connection between the first mold cavity (7) and the flow channel (5), and a second tearing edge opening is provided at the connection between the second mold cavity (8) and the flow channel (5).

3. The rubber injection molding die according to claim 2, characterized in that: The first mold cavity (7) and the second mold cavity (8) are mirror-symmetrical relative to the runner (5); the runner (5) is a divergent pipe distributed in a centrally symmetrical manner; the nozzle (11) passes through the upper mold plate (1) and the upper mold core (3) and is connected to the center of the runner (5).

4. The rubber injection molding die according to claim 1, characterized in that: The first mold cavity (7) is connected to a third tearing edge opening (72), and the second mold cavity (8) is connected to a fourth tearing edge opening. The third tearing edge opening (72) is located at the junction of the upper mold plate (1) and the middle mold plate (6), and the fourth tearing edge opening is located at the junction of the lower mold plate (2) and the middle mold plate (6). The third tearing edge opening (72) and the fourth tearing edge opening are connected to the outside world.

5. The rubber injection molding die according to claim 1, characterized in that: The upper core (3) is provided with a first exhaust groove (110) and a first exhaust hole (1101), and the lower core (4) is provided with a second exhaust groove and a second exhaust hole, one end of the first exhaust groove (110) is communicated with the first cavity (7), and the other end is communicated with the first exhaust hole (1101), one end of the second exhaust groove is communicated with the second cavity (8), and the other end is communicated with the second exhaust hole, the first exhaust hole (1101) passes through the upper core (3) and the upper template (1) and is communicated with the outside world, and the second exhaust hole passes through the lower core (4) and the lower template (2) and is communicated with the outside world.

6. The rubber injection molding die according to claim 1, characterized in that: The middle template (6) comprises a first middle template (61), a second middle template (62) and a third middle template (63); the first middle template (61), the second middle template (62) and the third middle template (63) are connected in sequence from top to bottom; and a retractable suspension member (64) is connected between the first middle template (61) and the second middle template (62) as well as between the second middle template (62) and the third middle template (63).

7. The rubber injection molding die according to claim 6, characterized in that: The hanging member (64) includes a contour sleeve (641) and a contour screw (642), wherein the contour screw (642) is slidably installed in the contour sleeve (641), and the second middle template (62) is provided with two groups of screw holes (621) arranged up and down, and the two groups of the contour screws (642) are respectively matched and connected with the two groups of screw holes (621), and the two groups of the contour sleeves (641) are respectively fixed on the first middle template (61) and the third middle template (63).

8. The rubber injection molding die according to claim 7, characterized in that: Elastic members (643) in a compressed state are further provided between the first middle template (61) and the second middle template (62), and between the second middle template (62) and the third middle template (63).

9. The rubber injection molding die according to claim 6, characterized in that: It also includes a positioning mechanism (9) for assisting mold closing.

10. The rubber injection molding die according to claim 9, characterized in that: The positioning mechanism (9) includes a guide column (93), a guide sleeve (94) and a guide column (91). The guide column (91) is fixedly arranged on the opposite surfaces of the upper template (1) and the lower template (2). A plurality of guide holes (92) are provided in the middle template (6). The guide holes (92) and the guide columns (91) are clearance-matched. The diameter of the guide holes (92) is larger than the diameter of the guide columns (91). The guide column (93) is fixedly connected to the upper template (1), the first middle template (61), the lower template (2) and the third middle template (63). The guide sleeve (94) is fixed in the first middle template (61), the second middle template (62) and the third middle template (63). The guide column (93) is in contact with the inner wall of the guide sleeve (94).

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