Rigid internal mold device for rubber vulcanization

Abstract

The utility model discloses a rigid internal mold device for rubber vulcanization, which belongs to the technical field of rubber vulcanization equipment and comprises a rigid internal mold main body formed by splicing a plurality of internal mold blocks and provided with an inner hole; the two tool rings abut against the two ends of the rigid inner mold body respectively, the end face of the rigid inner mold body and the abutting faces of the tool rings form matching faces, a positioning protrusion is arranged on one matching face, a positioning groove is formed in the other matching face, and the positioning protrusion is embedded into the positioning groove. The pull rods are located in the inner holes. One end of the pull rod is connected with one tool ring, and the other end of the pull rod is detachably connected with the other tool ring; when the two ends of the pull rod are connected with the tool rings respectively, the pull rod exerts tensioning force on the two tool rings to fix the rigid inner mold body. The tool ring can be connected and tensioned through the pull rod, the circle splicing precision of the inner die block can be guaranteed through the matching face of the rigid inner die body and the tool ring, the appearance quality and performance of vulcanization are improved, the overall mass is relatively low, and the occupied space is small.

Description

Technical Field

[0001] The utility model relates to the technical field of rubber vulcanization equipment, in particular to a rigid inner mold device for rubber vulcanization. Background Art

[0002] At present, during the tire vulcanization and molding process, some tire factories will pre-form the blank on a rigid inner mold device, and then place the rigid inner mold device together with the blank into a vulcanizer for vulcanization; at the same time, for the molding and vulcanization process of rubber tracks, the most important preparation method is to fix the pre-formed rubber track blank components on the workbench through a rigid inner mold device or directly mold the blank on the rigid inner mold device, and then place the rigid inner mold device and the blank together on a vulcanizer for vulcanization; the manufacturing process of tires and rubber tracks includes the process of using a rigid inner mold device to mold and vulcanize rubber products.

[0003] For the existing rigid inner mold device for rubber vulcanization, its rigid inner mold body is usually spliced ​​together by multiple inner modules with block structures, and one or more connecting parts are provided inside the rigid inner mold body. Different inner modules are connected to the connecting parts respectively, so as to achieve the effect of the inner modules being assembled into a whole circle. This will cause the rigid inner mold body to be heavier and occupy more space, and each inner module needs to be connected to the connecting parts, which will also affect the circle assembly accuracy of the inner modules, thereby affecting the appearance and performance of the vulcanized tire or track.

[0004] Therefore, it is an urgent problem to be solved at this stage to develop and design a rigid inner mold device that does not require large connecting parts inside the rigid inner mold body, thereby reducing the overall mass and occupied space, with high precision in the rounding of the inner module and improving the appearance quality and performance of the vulcanization. Utility Model Content

[0005] In response to the problems existing in the prior art, the utility model provides a rigid inner mold device for rubber vulcanization. Tooling rings are provided at both ends of the rigid inner mold body. The pull rod can connect and tighten the two tooling rings. The matching surface between the rigid inner mold body and the tooling ring can ensure the roundness accuracy of the inner module, effectively improving the appearance quality and performance of vulcanization. In addition, there are no large connecting parts inside the rigid inner mold body, the overall weight is relatively light, and it takes up less space.

[0006] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0007] The utility model provides a rigid inner mold device for rubber vulcanization, comprising:

[0008] A rigid inner mold body, the rigid inner mold body being formed by sequentially splicing a plurality of inner modules along the circumferential direction; the rigid inner mold body having an inner hole;

[0009] Two tooling rings, the two tooling rings respectively abutting against the two ends of the rigid inner mold body, the end surface of the rigid inner mold body and the abutting surfaces of the tooling rings forming matching mating surfaces, one of the mating surfaces being provided with a positioning protrusion, and the other being provided with a positioning groove matching the positioning protrusion, the positioning protrusion being embedded in the positioning groove;

[0010] A plurality of pull rods are provided, and the plurality of pull rods are all located in the inner hole; one end of the pull rod is connected to one of the tooling rings, and the other end of the pull rod is detachably connected to another tooling ring; when the two ends of the pull rod are respectively connected to the tooling rings, the pull rod applies a tensioning force to the two tooling rings to fix the rigid inner mold body.

[0011] As a preferred technical solution, the two tooling rings are respectively provided as a first tooling ring and a second tooling ring; one end of the pull rod is rotatably provided on the first tooling ring, and the pull rod can rotate between a first angle and a second angle; at the first angle, the other end of the pull rod is connected to the second tooling ring, and the pull rod tightens the first tooling ring and the second tooling ring; at the second angle, the other end of the pull rod is unhooked from the second tooling ring.

[0012] As a preferred technical solution, a positioning seat is provided on the first tooling ring; a connecting seat is provided on the second tooling ring, and a long slot is provided on the connecting seat; one end of the pull rod is rotatably connected to the positioning seat, and the other end of the pull rod passes through the long slot and is provided with a long strip; when the pull rod is at the first angle, the long strip abuts against the connecting seat to connect the first tooling ring and the second tooling ring; when the pull rod is at the second angle, when the pull rod moves along its axial direction, the long strip can pass through the long slot.

[0013] As a preferred technical solution, the end of the pull rod passes through the positioning seat and is fixedly connected to a rotating plate, and the rotating plate is provided with a long guide hole at one end away from the pull rod; the first tooling ring is provided with a rotating ring that can rotate relative to it, and the rotating ring is provided with a guide block, and the guide block is embedded in the guide hole.

[0014] As a preferred technical solution, the pull rod is located between the rotating plate and the positioning seat and is provided with a positioning nut threadedly connected thereto. The positioning seat is provided with a first through hole that is gap-matched with the pull rod. The first through hole has a limiting step, and the shape of the pull rod matches the first through hole.

[0015] As a preferred technical solution, an annular boss is provided on the inner ring of the first tooling ring, and a notch is provided on the annular boss at a position corresponding to the rotating plate;

[0016] And / or, the rotating ring is arranged at the outer ring of the first tooling ring.

[0017] As a preferred technical solution, a receiving groove is provided on the surface where the second tooling ring abuts the rigid inner mold body, a positioning block is provided in the receiving groove, and an elastic member is provided between the positioning block and the bottom wall of the receiving groove, and the elastic member causes the positioning block to tend to move away from the bottom wall of the receiving groove; the positioning protrusion or the positioning groove is provided on the surface of the positioning block away from the bottom wall of the receiving groove.

[0018] As a preferred technical solution, the second tooling ring is provided with a second through hole communicating with the bottom wall of the accommodating groove, and the second tooling ring is provided with a shoulder screw, which passes through the second through hole and is threadedly connected to the positioning block;

[0019] And / or, the elastic member is configured as a disc spring.

[0020] As a preferred technical solution, the positioning protrusion is arc-shaped and extends along the circumference of the rigid inner mold body;

[0021] and / or, the axis of the pull rod is parallel to the axial direction of the rigid inner mold body;

[0022] And / or, the plurality of tie rods are evenly distributed along the circumference of the rigid inner mold body.

[0023] As a preferred technical solution, a T-shaped connecting block is provided on the inner side surface of the inner module;

[0024] And / or, the joint surfaces between adjacent inner mold sections form an angle with the radial direction of the rigid inner mold body.

[0025] The beneficial effects of the present invention are as follows:

[0026] 1. Both ends of the rigid inner mold body of the present invention are provided with tooling rings. The pull rod located inside the rigid inner mold body can connect and tighten the two tooling rings. By utilizing the matching surface between the rigid inner mold body and the tooling ring, all the inner modules can be fixed along the circumferential direction, which can ensure the roundness accuracy of the inner modules and effectively improve the appearance quality and performance of vulcanization. In addition, there are no large connecting parts inside the rigid inner mold body, which reduces the occupied space while effectively reducing the overall quality of the rigid inner mold.

[0027] 2. The utility model can generate compression when subjected to external pressure through the positioning block and elastic member provided on the second tooling ring, so that the rotating ring can easily drive all the pull rods to rotate synchronously, and the first tooling ring and the second tooling ring can be quickly connected without repeated screw connections; when the external pressure disappears, the elastic member can apply elastic force to the rigid inner mold body, so that tension is generated at both ends of the pull rod, which can ensure force balance; at the same time, when disassembling the two tooling rings, when external pressure is applied to the first tooling ring, the rotating ring drives the pull rod to rotate through the rotating plate to achieve decoupling between the first tooling ring and the second tooling ring, which has higher production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a rigid inner mold device for rubber vulcanization according to the present invention;

[0029] Figure 2 for Figure 1 Schematic diagram of the structure when in use;

[0030] Figure 3 for Figure 1 A schematic diagram of the structure in which the pull rod is located at a second angle;

[0031] Figure 4 for Figure 3 A schematic diagram of the structure of the two tooling rings during installation or removal;

[0032] Figure 5 for Figure 1 Schematic diagram of the structure of the rigid inner mold body;

[0033] Figure 6 for Figure 5 sectional view of

[0034] Figure 7 for Figure 1 A schematic structural diagram of the first tooling ring in FIG.

[0035] Figure 8 for Figure 7 sectional view of

[0036] Figure 9 for Figure 1 A top view of the second tooling ring in FIG;

[0037] Figure 10 for Figure 9 sectional view of .

[0038] In the figure: 1-rigid inner mold body, 11-inner module, 12-inner hole, 13-T-shaped connecting block, 2-first tooling ring, 21-positioning seat, 22-rotating ring, 23-guide block, 24-first through hole, 241-limiting step, 25-annular boss, 251-notch, 3-second tooling ring, 31-connecting seat, 32-long notch, 33-accommodating groove, 34-positioning block, 35-elastic member, 36-second through hole, 37-shoulder screw, 41-positioning protrusion, 42-positioning groove, 5-pull rod, 51-long strip block, 52-positioning nut, 6-rotating plate, 61-guide hole, 7-embryo. DETAILED DESCRIPTION

[0039] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0040] Please refer to Figures 1-10 , which is an embodiment of a rigid inner mold device for rubber vulcanization provided by the present invention, including a rigid inner mold body 1, which is composed of a plurality of inner modules 11 spliced ​​in sequence along the circumferential direction, the rigid inner mold body 1 has an inner hole 12, and a plurality of tie rods 5 are arranged in the inner hole 12; two tooling rings are respectively abutted against the two ends of the rigid inner mold body 1, one end of the tie rod 5 is connected to one tooling ring, and the other end of the tie rod 5 is detachably connected to the other tooling ring; the end face of the rigid inner mold body 1 and the abutting surface of the tooling ring form a matching mating surface, one of the mating surfaces is provided with a positioning protrusion 41, and the other is provided with a positioning groove 42 matching the positioning protrusion 41, the positioning protrusion 41 is embedded in the positioning groove 42, so as to realize the positioning and fixation between the rigid inner mold body 1 and the tooling ring; when the two ends of the tie rod 5 are respectively connected to the tooling ring, the tie rod 5 applies a tensioning force to the two tooling rings to fix all the inner modules 11, thereby ensuring the roundness of the inner modules 11 and improving the appearance quality and performance of vulcanization.

[0041] For details, please refer to Figure 9 The cross-sectional shape of the positioning protrusion 41 is preferably triangular, and the extension direction of the positioning protrusion 41 is preferably arc-shaped and extends along the circumference of the rigid inner mold body 1. The shape of the positioning groove 42 cooperates with the positioning protrusion 41, and the two cooperations can effectively position and fix the inner module 11; in other embodiments, the cross-sectional shape of the positioning protrusion 41 can also be set to other shapes such as semicircular, trapezoidal, etc., and the positioning protrusion 41 can also include multiple circumferentially distributed sub-protrusions, so that after the positioning protrusion 41 cooperates with the positioning groove 42, the inner module 11 can be positioned and fixed.

[0042] For clarification, please refer to Figures 1-4 as well as Figure 7 and Figure 8The axis of the tie rod 5 should be parallel to the axial direction of the rigid inner mold body 1, and several tie rods 5 should be evenly distributed along the circumference of the rigid inner mold body 1. The tensioning force applied by several tie rods 5 can be evenly applied to all inner modules 11, which can effectively ensure the roundness accuracy of the inner module 11 and the stability of the rigid inner mold body 1.

[0043] In this embodiment, please refer to Figures 1-4 The two tooling rings are respectively provided with a first tooling ring 2 and a second tooling ring 3; one end of the pull rod 5 is rotatably provided on the first tooling ring 2, and the pull rod 5 can rotate between a first angle and a second angle; at the first angle, the other end of the pull rod 5 is connected to the second tooling ring 3, and the pull rod 5 tightens the first tooling ring 2 and the second tooling ring 3, positioning and fixing all the inner modules 11 along the circumferential direction to ensure the roundness of the inner modules 11; at the second angle, the other end of the pull rod 5 is unhooked from the second tooling ring 3, and the installation or disassembly between the first tooling ring 2 and the second tooling ring 3 can be easily realized.

[0044] It should be noted that Figure 1 In the embodiment, the pull rod 5 is located at a first angle.

[0045] Based on the above examples, please refer to Figures 1-6 The first tooling ring 2 is provided with a positioning seat 21; the second tooling ring 3 is provided with a connecting seat 31, and the connecting seat 31 is provided with a long slot 32; one end of the pull rod 5 is rotatably connected to the positioning seat 21, and the other end of the pull rod 5 passes through the long slot 32 and is provided with a long strip 51; when the pull rod 5 is at the first angle, the long strip 51 abuts against the connecting seat 31 to connect the first tooling ring 2 and the second tooling ring 3, thereby realizing the circumferential fixation of the inner module 11; when the pull rod 5 is at the second angle, when the pull rod 5 moves along its axial direction, the long strip 51 can pass through the long slot 32, which can be easily installed or disassembled; in other embodiments, the pull rod 5 and the second tooling ring 3 can also be directly connected by bolts, so as to be able to firmly fasten the rigid inner mold body 1.

[0046] For further information, please refer to Figure 7 and Figure 8The end of the pull rod 5 passes through the positioning seat 21 and is fixedly connected to the rotating plate 6. The end of the rotating plate 6 away from the pull rod 5 is provided with a long guide hole 61; the first tooling ring 2 is provided with a rotating ring 22 that can rotate relative to it, and the rotating ring 22 is provided with a guide block 23. The guide block 23 is embedded in the guide hole 61 and is clearance-fitted with the guide hole 61. When the rotating ring 22 rotates relative to the first tooling ring 2, the guide block 23 drives the rotating plate 6 to swing with the axis of the pull rod 5 as the center through the guide hole 61, that is, drives the pull rod 5 and the long block 51 to rotate relative to the positioning seat 21 between the first angle and the second angle; specifically, the rotating ring 22 and the first tooling ring 2 can be set as a clearance fit or relative rotation can be achieved by setting a bearing. The rotating ring 22 can be rotated by manual or mechanical drive.

[0047] For further information, please refer to Figure 8 The pull rod 5 is located between the rotating plate 6 and the positioning seat 21 and is provided with a positioning nut 52 threadedly connected to it. The positioning nut 52 abuts against the positioning seat 21, and the position of the pull rod 5 in its axial direction can be positioned by the positioning nut 52; the positioning seat 21 is provided with a first through hole 24 that is clearance-matched with the pull rod 5, and the pull rod 5 can rotate smoothly relative to the positioning seat 21; the first through hole 24 is provided with a limiting step 241, and the shape of the pull rod 5 matches the first through hole 24, and the limiting step 241 can further limit the position of the pull rod 5 in its axial direction to prevent the pull rod 5 from moving along its axial direction during use.

[0048] For clarification, please refer to Figure 7 An annular boss 25 is provided at the inner ring of the first tooling ring 2, and the external pressure can directly act on the first tooling ring 2 through the annular boss 25. A notch 251 is provided at the position of the annular boss 25 corresponding to the rotating plate 6, which can prevent the annular boss 25 from interfering with the rotating plate 6 when the rotating ring 22 rotates; at the same time, the rotating ring 22 is provided at the outer ring of the first tooling ring 2.

[0049] In this embodiment, please refer to Figure 9 and Figure 10The surface of the second tooling ring 3 abutting the rigid inner mold body 1 is provided with a plurality of circumferentially distributed receiving grooves 33, each of which is provided with a positioning block 34, and an elastic member 35 is provided between the positioning block 34 and the bottom wall of the receiving groove 33. The elastic member 35 makes the positioning block 34 have a tendency to move away from the bottom wall of the receiving groove 33, and the positioning protrusion 41 is provided on the surface of the positioning block 34 away from the bottom wall of the receiving groove 33. The elastic member 35 makes the positioning protrusion 41 on the positioning block 34 protrude from the mating surface of the second tooling ring 3 when no force is applied, and is positioned during use. The positioning block 34 is forced to retract into the accommodating groove 33 to generate compression, which plays a role in tightening the rigid inner mold body 1; in other embodiments, the surface of the positioning block 34 away from the bottom wall of the accommodating groove 33 can also be set as a positioning groove 42, and accordingly, a positioning protrusion 41 is provided on the mating surface of the rigid inner mold body 1, so that they can cooperate with each other to fix the inner module 11; in other embodiments, the accommodating groove 33, the positioning block 34 and the elastic member 35 can also be set on the first tooling ring 2, so that the rigid inner mold body 1 can be tightened.

[0050] For further information, please refer to Figure 10 The second tooling ring 3 is provided with a second through hole 36 that is connected to the bottom wall of the accommodating groove 33, and the second tooling ring 3 is provided with a shoulder screw 37. The shoulder screw 37 passes through the second through hole 36 and is threadedly connected to the positioning block 34. By controlling the depth of the shoulder screw 37 screwed into the positioning block 34, the protrusion height of the positioning protrusion 41 on the positioning block 34 from the mating surface of the second tooling ring 3 can be adjusted, and the compression amount of the positioning block 34 can be controlled in cooperation with the elastic member 35 and the pull rod 5.

[0051] Specifically, the elastic member 35 is preferably configured as a disc spring.

[0052] In this embodiment, please refer to Figure 5 The splicing surfaces between adjacent inner modules 11 should form an angle with the radial direction of the rigid inner mold body 1. When the inner module 11 is subjected to external force, the adjacent inner modules 11 can generate force through the splicing surfaces, which can prevent a certain inner module 11 from moving radially.

[0053] For further information, please refer to Figures 1-6 A T-shaped connecting block 13 is provided on the inner side of the inner module 11, and the T-shaped connecting block 13 can quickly connect the inner module 11 with the central mechanism that drives it to open and close.

[0054] The specific installation method of this utility model is as follows:

[0055] Please refer to Figure 4, place the second tooling ring 3, the rigid inner mold body 1, and the first tooling ring 2 in order from bottom to top, and make the mating surfaces between the tooling ring and the rigid inner mold body 1 match each other; the pull rod 5 is pre-installed on the first tooling ring 2, so that the pull rod 5 passes through the long slot 32. At this time, part of the positioning block 34 still protrudes from the upper surface of the second tooling ring 3, and the upper surface of the long strip 51 at the bottom of the pull rod 5 is higher than the lower surface of the connecting seat 31;

[0056] Please refer to Figure 3 , applying downward pressure to the first tooling ring 2, which is transmitted to the positioning block 34 through the inner module 11. At this time, the upper surface of the positioning block 34 is flush with the upper surface of the second tooling ring 3, and the upper surface of the long block 51 at the bottom of the pull rod 5 is not higher than the lower surface of the connecting seat 31;

[0057] Please refer to Figure 1 , maintain downward pressure on the first tooling ring 2, rotate the rotating ring 22, and drive the pull rod 5 to rotate through the rotating plate 6. At this time, the long block 51 at the bottom of the pull rod 5 and the long notch 32 on the connecting seat 31 are staggered. The lower surface of the connecting seat 31 can prevent the long block 51 from moving upward, thereby realizing the connection between the first tooling ring 2 and the second tooling ring 3. Specifically, the pull rod 5 needs to rotate 90 degrees from the first angle to the second angle, which can improve the stability of the connection between the pull rod 5 and the second tooling ring 3.

[0058] Please refer to Figure 2 , the tire or rubber track blank is wound on the rigid inner mold body 1, and the utility model can be placed together with the blank into the vulcanizer for vulcanization.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A rigid inner mold device for rubber vulcanization, characterized in that: include: A rigid inner mold body (1), wherein the rigid inner mold body (1) is formed by sequentially splicing a plurality of inner modules (11) along the circumferential direction; the rigid inner mold body (1) has an inner hole (12); Two tooling rings, the two tooling rings respectively abutting against the two ends of the rigid inner mold body (1), the end surface of the rigid inner mold body (1) and the abutting surface of the tooling rings forming a matching mating surface, one of the mating surfaces being provided with a positioning protrusion (41), and the other being provided with a positioning groove (42) matching the positioning protrusion (41), the positioning protrusion (41) being embedded in the positioning groove (42); A plurality of pull rods (5), wherein the plurality of pull rods (5) are all located in the inner hole (12); one end of the pull rod (5) is connected to one of the tooling rings, and the other end of the pull rod (5) is detachably connected to another of the tooling rings; when the two ends of the pull rod (5) are respectively connected to the tooling rings, the pull rod (5) applies a tensioning force to the two tooling rings to fix the rigid inner mold body (1).

2. A rigid inner mold device for rubber vulcanization according to claim 1, characterized in that: The two tooling rings are respectively provided as a first tooling ring (2) and a second tooling ring (3); one end of the pull rod (5) is rotatably provided on the first tooling ring (2), and the pull rod (5) can be rotated between a first angle and a second angle; at the first angle, the other end of the pull rod (5) is connected to the second tooling ring (3), and the pull rod (5) tightens the first tooling ring (2) and the second tooling ring (3); at the second angle, the other end of the pull rod (5) is unhooked from the second tooling ring (3).

3. A rigid inner mold device for rubber vulcanization according to claim 2, characterized in that: The first tooling ring (2) is provided with a positioning seat (21); the second tooling ring (3) is provided with a connecting seat (31), and the connecting seat (31) is provided with a long slot (32); one end of the pull rod (5) is rotatably connected to the positioning seat (21), and the other end of the pull rod (5) passes through the long slot (32) and is provided with a long strip (51); when the pull rod (5) is located at the first angle, the long strip (51) abuts against the connecting seat (31) to connect the first tooling ring (2) and the second tooling ring (3); when the pull rod (5) is located at the second angle, when the pull rod (5) moves along its axial direction, the long strip (51) can pass through the long slot (32).

4. A rigid inner mold device for rubber vulcanization according to claim 3, characterized in that: The end of the pull rod (5) passes through the positioning seat (21) and is fixedly connected to a rotating plate (6), and an elongated guide hole (61) is provided at one end of the rotating plate (6) away from the pull rod (5); the first tooling ring (2) is provided with a rotating ring (22) that can rotate relative to it, and the rotating ring (22) is provided with a guide block (23), and the guide block (23) is embedded in the guide hole (61).

5. A rigid inner mold device for rubber vulcanization according to claim 4, characterized in that: The pull rod (5) is located between the rotating plate (6) and the positioning seat (21) and is provided with a positioning nut (52) threadedly connected thereto. The positioning seat (21) is provided with a first through hole (24) that is clearance-matched with the pull rod (5). The first through hole (24) has a limiting step (241). The shape of the pull rod (5) matches the first through hole (24).

6. A rigid inner mold device for rubber vulcanization according to claim 4, characterized in that: An annular boss (25) is provided on the inner ring of the first tooling ring (2), and a notch (251) is provided on the annular boss (25) at a position corresponding to the rotating plate (6); And / or, the rotating ring (22) is arranged on the outer ring of the first tooling ring (2).

7. A rigid inner mold device for rubber vulcanization according to claim 2, characterized in that: A receiving groove (33) is provided on the surface where the second tooling ring (3) contacts the rigid inner mold body (1); a positioning block (34) is provided in the receiving groove (33); an elastic member (35) is provided between the positioning block (34) and the bottom wall of the receiving groove (33); the elastic member (35) causes the positioning block (34) to have a tendency to move away from the bottom wall of the receiving groove (33); and the positioning protrusion (41) or the positioning groove (42) is provided on the surface of the positioning block (34) away from the bottom wall of the receiving groove (33).

8. A rigid inner mold device for rubber vulcanization according to claim 7, characterized in that: The second tooling ring (3) is provided with a second through hole (36) communicating with the bottom wall of the accommodating groove (33); the second tooling ring (3) is provided with a shoulder screw (37); the shoulder screw (37) passes through the second through hole (36) and is threadedly connected to the positioning block (34); And / or, the elastic member (35) is configured as a disc spring.

9. A rigid inner mold device for rubber vulcanization according to claim 1, characterized in that: The positioning protrusion (41) is arc-shaped and extends along the circumference of the rigid inner mold body (1); and / or, the axis of the pull rod (5) is parallel to the axial direction of the rigid inner mold body (1); And / or, the plurality of tie rods (5) are evenly distributed along the circumference of the rigid inner mold body (1).

10. A rigid inner mold device for rubber vulcanization according to claim 1, characterized in that: A T-shaped connecting block (13) is provided on the inner side surface of the inner module (11); And / or, the joint surface between adjacent inner mold sections (11) forms an angle with the radial direction of the rigid inner mold body (1).

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