Tire vulcanization capsule production device and production process

Abstract

The application relates to the technical field of tire vulcanization capsule production, in particular to a tire vulcanization capsule production device and a production process. The tire vulcanization capsule production device comprises a rack, a core mold, a lower mold, an upper mold and an injection cylinder which is connected with the upper mold, the core mold is internally provided with a first inner cavity and a second inner cavity, the first inner cavity is communicated with an air inlet channel, the second inner cavity is communicated with an air outlet channel, the air inlet channel and the air outlet channel are connected with a heat medium circulating system, the lower mold is internally provided with a third inner cavity which is communicated with the first inner cavity and a fourth inner cavity which is communicated with the second inner cavity, and the upper mold is internally provided with a fifth inner cavity which is communicated with the third inner cavity and the fourth inner cavity. In the tire vulcanization capsule production device, the heat medium circulating system is connected with the core mold, so that the core mold, the lower mold and the upper mold can be heated at the same time, the layout of a heating pipeline is reduced, the vulcanization temperature uniformity during vulcanization forming is improved in the tire vulcanization capsule forming process, and the quality of the tire vulcanization capsule is improved.

Description

Technical Field

[0001] This invention relates to the field of tire vulcanizing bladder production technology, and in particular to a tire vulcanizing bladder production apparatus and production process. Background Technology

[0002] Tire vulcanizing bladders are hollow, thin-walled rubber products used in tire vulcanizing machines. They are inserted into the inner cavity of the tire blank to be vulcanized, and then a heating medium is introduced to facilitate the shaping and vulcanization process in conjunction with the vulcanizing machine. Existing methods for forming tire vulcanizing bladders mainly include compression molding and injection molding. In the injection molding method, the upper mold, lower mold, and core mold are closed and heated to the vulcanization temperature. Then, rubber material is injected into the mold cavity by an injection molding machine for vulcanization. After vulcanization, the mold is opened and the tire vulcanizing bladder is removed from the core mold.

[0003] Patent application CN202411571116.0 discloses a tire vulcanizing bladder production device, including a frame with a lifting mechanism and a core mold. The lifting mechanism connects an upper mold, a lower mold, and an injection cylinder. A pressure plate is provided between the core mold and the upper mold. The core mold, pressure plate, upper mold, and lower mold can close to form a molding cavity. A feed pipe communicating with the molding cavity is provided at the center of the pressure plate. The feed pipe is sealed and slidably passes through the upper mold and connects to the injection cylinder. A demolding air passage communicating with the molding cavity and an external air source is provided inside the core mold. This tire vulcanizing bladder production device can achieve rapid and safe demolding, automatic removal of the top cover, improved production efficiency, reduced labor intensity, and uniform heating of the core mold to obtain high-quality tire vulcanizing bladders. However, the above technical solution has the following problems: the upper mold, lower mold, and core mold need to be equipped with separate hot medium circulation pipelines and the flow rate of the hot medium in each pipeline needs to be controlled, making the operation relatively complex and resulting in poor heating uniformity. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a tire vulcanizing bladder production apparatus, including a frame, on which a core mold, a lower mold, an upper mold, and an injection cylinder docking with the upper mold are provided. The core mold has a first inner cavity and a second inner cavity inside. The first inner cavity is connected to an air inlet channel, and the second inner cavity is connected to an air outlet channel. The air inlet channel and the air outlet channel are connected to a heat medium circulation system. The lower mold has a third inner cavity connected to the first inner cavity and a fourth inner cavity connected to the second inner cavity inside. The upper mold has a fifth inner cavity connected to the third inner cavity and the fourth inner cavity.

[0005] Preferably, the frame includes a gantry frame, which has a fixed platform and a sliding platform from bottom to top. The fixed platform has a core mold, a lower mold, and a lower cylinder for driving the core mold to rise and fall. The sliding platform has an upper mold and an injection cylinder. The top of the gantry frame has an upper cylinder for driving the sliding platform to rise and fall.

[0006] Preferably, the core mold includes a hollow core mold body and two inner partitions that divide the core mold body into a first inner cavity and a second inner cavity; the lower mold includes a hollow lower mold body and two lower partitions that divide the lower mold body into a third inner cavity and a fourth inner cavity.

[0007] Preferably, the core mold has a central shaft that slides through the lower mold at its center. The central shaft has an air inlet channel and an air outlet channel inside. The air inlet channel and the air outlet channel are inverted "L" shape and extend from the lower end face of the central shaft to the top of its side wall. The bottom of the first inner cavity and the second inner cavity are respectively provided with a first through hole vertically. The inner side walls of the third inner cavity and the fourth inner cavity are respectively provided with "L" shaped air pipes. The vertical section of the air pipe is sealed and slidably inserted into the first through hole.

[0008] Preferably, the top of the third inner cavity and the fourth inner cavity are respectively provided with a second through hole, and the bottom of the fifth inner cavity is provided with two third through holes that are corresponding to and communicate with the two second through holes.

[0009] Preferably, the fifth inner cavity of the upper mold is provided with six upper partitions that divide the fifth inner cavity into six equal parts. The top of the four upper partitions near the two third through holes is provided with flow holes, and the bottom of the two upper partitions away from the two third through holes is provided with flow holes.

[0010] Preferably, the lower mold and the upper mold are provided with a sealing mechanism, the sealing mechanism including four first sealing plugs that slide through two second through holes and two third through holes. The mating ends of the upper and lower first sealing plugs are respectively provided with grooves and first springs for driving the first sealing plugs to rise and fall. The sidewall of the groove is provided with a first connecting hole. When the mold is closed, the first connecting hole extends into the third inner cavity, the fourth inner cavity or the fifth inner cavity. When the mold is opened, the first connecting hole extends into the second through hole and the third through hole.

[0011] Preferably, the first sealing plug includes a sealing plug body, the opening end of the sealing plug body is provided with a first limiting flange, the closed end is provided with a second limiting flange, the second limiting flange is located in a third inner cavity, a fourth inner cavity or a fifth inner cavity, the lower end face of the upper mold and the upper end face of the lower mold are respectively provided with limiting grooves for accommodating the first limiting flange, the bottom of the limiting groove is provided with a spring groove for installing a first spring, and the sealing plug body, the second through hole and the third through hole are all rectangular.

[0012] Preferably, the upper end face of the lower mold is provided with a vertical slide groove extending into the lower partition plate, a second sealing plug is slidably disposed in the slide groove, a second spring connected to the second sealing plug is provided at the bottom of the slide groove, a second connecting hole communicating with the slide groove is provided on the side wall of the lower partition plate, and a third connecting hole is provided on the second sealing plug. When the mold is closed, the second sealing plug blocks the second connecting hole on the lower partition plate, and when the mold is opened, the third connecting hole on the second sealing plug communicates with the second connecting hole.

[0013] This invention provides a manufacturing process for tire vulcanizing bladders, comprising the following steps:

[0014] Step S1: Add the measured butyl rubber, carbon black, zinc oxide, stearic acid, castor oil, antioxidant and vulcanizing agent to a mixer and mix at 100-120℃ for 15-30 minutes to obtain the mixed rubber.

[0015] Step S2: Add the intensive rubber to the open mill and mix at 75-85℃ for 15-30 minutes to obtain the open rubber sheet;

[0016] Step S3: With the tire vulcanizing bladder production device in the closed state, the heat medium circulation system is turned on. The heat medium circulation system introduces heat medium into the first inner cavity of the core mold through the air inlet channel. The heat medium enters the third inner cavity of the lower mold from the first inner cavity, enters the fifth inner cavity of the upper mold from the third inner cavity, enters the fourth inner cavity of the lower mold from the fifth inner cavity, enters the second inner cavity of the core mold from the fourth inner cavity, and finally flows back to the heat medium circulation system through the air outlet channel of the second inner cavity, heating the core mold, lower mold, and upper mold to 150-180℃.

[0017] Step S4: Add the open-processed rubber sheet into the injection cylinder of the tire vulcanizing bladder production device. The temperature of the injection cylinder is 75-85℃. The injection cylinder injects rubber material into the mold cavity of the tire vulcanizing bladder production device. The injection pressure is 10-20MPa. After injection, vulcanize at 150-180℃ for 40-50 minutes to obtain the tire vulcanizing bladder.

[0018] Step S5: Open the mold, remove the tire vulcanizing capsule from the core mold, and then close the mold for the next injection vulcanization.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] 1. The core mold, lower mold, and upper mold together form a heat medium circulation path. The heat medium circulation system is connected to the core mold, which can heat the core mold, lower mold, and upper mold simultaneously, reducing the layout of heating pipes and improving heating uniformity and stability.

[0021] 2. The first inner cavity of the core mold and the third inner cavity of the lower mold are connected by an "L"-shaped air pipe. When demolding, the core mold rises relative to the lower mold. The vertical section of the air pipe can slide in the first through hole of the core mold without disengaging from the first through hole. This ensures that the first and second inner cavities of the core mold are still in a sealed communication with the third and fourth inner cavities of the lower mold during demolding, preventing the leakage of heat medium and saving energy and protecting the environment.

[0022] 3. The fifth inner cavity of the upper mold is provided with six upper partitions that divide the fifth inner cavity into six equal parts. The top of the four upper partitions near the two third through holes is provided with a first flow hole, and the bottom of the two upper partitions away from the two third through holes is provided with a second flow hole. The heat medium can flow in a wave-like manner in the fifth inner cavity divided into six equal parts, so that the heat medium can fully fill the fifth inner cavity and improve the heating uniformity.

[0023] 4. The upper and lower molds are equipped with a sealing mechanism. The sealing mechanism can block the second through hole of the lower mold and the third through hole of the upper mold when the mold is opened to prevent the leakage of heat medium. When the mold is closed, the second through hole and the third through hole are connected to ensure the circulation of heat medium.

[0024] 5. The lower mold is equipped with a second sealing plug. When the mold is closed, the second sealing plug can block the second connecting hole on the lower partition plate of the lower mold, separating the third inner cavity and the fourth inner cavity, without interfering with the circulation of the heat medium between the lower mold and the upper mold. When the mold is opened, the third connecting hole on the second sealing plug can communicate with the second connecting hole on the lower partition plate, so that the third inner cavity and the fourth inner cavity are interconnected. The heat medium can form a circulation between the lower mold and the core mold without shutting down the heat medium circulation equipment, thus improving work efficiency.

[0025] 6. The present invention uses a tire vulcanizing capsule production device in the injection molding process of tire vulcanizing capsules, which can improve the uniformity of vulcanization temperature during injection molding and improve the quality of tire vulcanizing capsules.

[0026] In summary, the tire vulcanizing bladder production apparatus provided by this invention allows for simultaneous heating of the core mold, lower mold, and upper mold by connecting the heat medium circulation system to the core mold, thereby reducing the need for heating pipelines. When used in the tire vulcanizing bladder molding process, it can improve the uniformity of vulcanization temperature during vulcanization molding and enhance the quality of the tire vulcanizing bladder. Attached Figure Description

[0027] Figure 1 A schematic diagram of a tire vulcanizing bladder production unit;

[0028] Figure 2 This is a three-dimensional cross-sectional view of the core mold, lower mold, and upper mold in the mold-closed state.

[0029] Figure 3 This is another three-dimensional cross-sectional view of the core mold, lower mold, and upper mold in the mold-closed state.

[0030] Figure 4 This is a front view of the core mold, lower mold, and upper mold in the mold-closed state.

[0031] Figure 5 for Figure 4 AA cross-section view;

[0032] Figure 6 for Figure 4BB cross-section;

[0033] Figure 7 This is a top view of the core mold, lower mold, and upper mold in the mold-closed state.

[0034] Figure 8 for Figure 7 CC cross-section;

[0035] Figure 9 for Figure 7 DD cross-section;

[0036] Figure 10 for Figure 9 A magnified view of part A in the image;

[0037] Figure 11 An exploded view of the sealing mechanism, the second sealing plug, and the second spring.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Frame; 11. Gantry frame; 12. Fixed platform; 13. Sliding platform; 14. Lower cylinder; 15. Upper cylinder; 2. Core mold; 21. Core mold body; 22. Inner partition; 23. Central shaft; 24. First inner cavity; 25. Second inner cavity; 26. Air inlet channel; 27. Air outlet channel; 28. First through hole; 3. Lower mold; 31. Lower mold body; 32. Lower partition; 321. Second connecting hole; 33. Third inner cavity; 34. Fourth inner cavity; 35. Air pipe; 36. Second through hole; 37. Slide groove. 38. Second sealing plug; 381. Third connecting hole; 39. Second spring; 4. Upper mold; 41. Upper mold body; 42. Fifth inner cavity; 43. Third through hole; 44. Upper partition plate; 45. First flow hole; 46. Second flow hole; 5. Injection cylinder; 6. Sealing mechanism; 61. First sealing plug; 611. Sealing plug body; 612. First limiting flange; 613. Second limiting flange; 62. Groove; 63. First spring; 64. First connecting hole; 65. Limiting groove; 66. Spring groove. Detailed Implementation

[0040] The specific embodiments of the present invention are described below with reference to the accompanying drawings and examples:

[0041] It should be noted that the structures, proportions, sizes, etc. shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should fall within the scope of the technical content disclosed in the present invention.

[0042] Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention. Example 1

[0043] Combined with appendix Figure 1-11 This embodiment provides a tire vulcanizing bladder production apparatus, including a frame 1. The frame 1 is provided with a core mold 2, a lower mold 3, an upper mold 4, and an injection cylinder 5 that docks with the upper mold 4. The core mold 2 has a first inner cavity 24 and a second inner cavity 25 inside. The first inner cavity 24 is connected to an air inlet channel 26, and the second inner cavity 25 is connected to an air outlet channel 27. The air inlet channel 26 and the air outlet channel 27 are connected to a heat medium circulation system. The lower mold 3 has a third inner cavity 33 that communicates with the first inner cavity 24 and a fourth inner cavity 34 that communicates with the second inner cavity 25. The upper mold 4 has a fifth inner cavity 42 that communicates with the third inner cavity 33 and the fourth inner cavity 34.

[0044] In the above technical solution, the core mold 2, lower mold 3, and upper mold 4 together form a heat medium circulation path. The heat medium circulation system is connected to the core mold 2, which allows for simultaneous heating of the core mold 2, lower mold 3, and upper mold 4, reducing the need for heating pipes and improving heating uniformity and stability. During use, the heat medium circulation system introduces heat medium (usually high-temperature steam or heating oil) into the first inner cavity 24 of the core mold 2 through the air inlet channel 26. The heat medium then enters the third inner cavity 33 of the lower mold 3 from the first inner cavity 24, then the fifth inner cavity 42 of the upper mold 4 from the third inner cavity 33, then the fourth inner cavity 34 of the lower mold 3 from the fifth inner cavity 42, and finally the second inner cavity 25 of the core mold 2 from the fourth inner cavity 34. Finally, it returns to the heat medium circulation system through the air outlet channel 27 of the second inner cavity 25. The above technical solution does not mention... The invention employs conventional configurations, such as the injection cylinder 5 typically including a cylinder body and an extrusion screw, the core mold 2, lower mold 3, and upper mold 4 forming an injection cavity, the core mold 2 typically including a hollow core mold body 21, the core mold body 21 having a central shaft 23 that slides through the lower mold 3 at its center, the core mold body 21 being seated within the lower mold 3, the core mold body 21 having a sealing ring at the joint between the core mold 2 and the lower mold 3, the lower mold 3 having a sealing ring or an embedded interlocking sealing structure at the joint between the upper mold 4, the upper mold 4 including an upper mold body 41, a pressure plate fixedly located at the top center of the upper mold body 41, the pressure plate having an injection port that mates with the injection cylinder 5, and a support column abutting against the upper surface of the core mold 2 on the lower end face of the pressure plate. Of course, the injection cylinder 5, core mold 2, lower mold 3, and upper mold 4 are not limited to the above structures, and any structure that enables internal cavity communication is applicable to the present invention.

[0045] In one specific technical solution, the frame 1 includes a gantry frame 11, which is provided with a fixed platform 12 and a sliding platform 13 from bottom to top. The fixed platform 12 is provided with a core mold 2, a lower mold 3 and a lower cylinder 14 for driving the core mold 2 to rise and fall. The sliding platform 13 is provided with an upper mold 4 and an injection cylinder 5. The top of the gantry frame 11 is provided with an upper cylinder 15 for driving the sliding platform 13 to rise and fall.

[0046] In the above technical solution, the lower mold 3 is fixedly installed on the fixed platform 12, the core mold 2 can be raised and lowered under the drive of the lower cylinder 14, the upper mold 4 and the injection cylinder 5 are fixed on the sliding platform 13, and the sliding platform 13 is started to be raised and lowered so that the upper mold 4 and the injection cylinder 5 are raised and lowered synchronously.

[0047] In one specific technical solution, the core mold 2 includes a hollow core mold body 21 and two inner partitions 22 that divide the core mold body 21 into a first inner cavity 24 and a second inner cavity 25; the lower mold 3 includes a hollow lower mold body 31 and two lower partitions 32 that divide the lower mold body 31 into a third inner cavity 33 and a fourth inner cavity 34.

[0048] In the above technical solution, the two inner partitions 22 are preferably distributed equidistantly along the circumference of the core mold 2, so that the volumes of the first inner cavity 24 and the second inner cavity 25 are equal. The two lower partitions 32 are preferably distributed equidistantly along the circumference of the lower mold body 31, so that the volumes of the third inner cavity 33 and the fourth inner cavity 34 are equal.

[0049] In one specific technical solution, the core mold 2 has a central shaft 23 that slides through the lower mold 3 at its center. The central shaft 23 has an air inlet channel 26 and an air outlet channel 27 inside. The air inlet channel 26 and the air outlet channel 27 are inverted "L" shape and extend from the lower end face of the central shaft 23 to the top of its side wall. The bottom of the first inner cavity 24 and the second inner cavity 25 are respectively provided with a first through hole 28 vertically. The inner side walls of the third inner cavity 33 and the fourth inner cavity 34 are respectively provided with "L" shaped air pipes 35. The vertical section of the air pipe 35 is sealed and slidably inserted into the first through hole 28.

[0050] In the above technical solution, the first inner cavity 24 and the third inner cavity 33 are connected by an "L"-shaped air pipe 35. During demolding, the core mold 2 rises relative to the lower mold 3. The vertical section of the air pipe 35 can slide sealed within the first through hole 28 of the core mold 2 without detaching from the first through hole 28. This ensures that the first inner cavity 24 and the second inner cavity 25 of the core mold 2 remain sealed and connected with the third inner cavity 33 and the fourth inner cavity 34 of the lower mold 3 during demolding, preventing heat medium leakage and saving energy and protecting the environment. The air inlet channel 26 and the air outlet channel 27 extend from the lower end face of the central shaft 23 to the top of its side wall, ensuring that in the vertical direction, the air outlet end of the air inlet channel 26 is far away from the first through hole 28 at the bottom of the first inner cavity 24, and the air inlet end of the air outlet channel 27 is far away from the first through hole 28 at the bottom of the second inner cavity 25, increasing the residence time of the heat medium in the core mold 2. Preferably, as shown in the figure... Figure 5 As shown, with the axis of the core mold 2 as the center, the air inlet channel 26 and the air outlet channel 27 are located on the same radial line, and the two first through holes 28 are located on the same radial line. In the first inner cavity 24, the air inlet channel 26 is close to one inner partition 22, and the first through hole 28 is close to another inner partition 22. In the second inner cavity 25, the air outlet channel 27 is close to one inner partition 22, and the first through hole 28 is close to another inner partition 22. The above structure can maximize the circumferential flow distance of the heat medium in the same cavity, so that the heat medium can uniformly fill the first inner cavity 24 and the second inner cavity 25.

[0051] In a specific technical solution, such as Figure 10 As shown, the top of the third inner cavity 33 and the fourth inner cavity 34 are respectively provided with a second through hole 36, and the bottom of the fifth inner cavity 42 is provided with two third through holes 43 that are connected to the two second through holes 36.

[0052] In the above technical solution, the heat medium in the third inner cavity 33 of the lower mold 3 enters the fifth inner cavity 42 of the upper mold 4 through a second through hole 36 of the lower mold 3 and a third through hole 43 of the upper mold 4. Then, it enters the fourth inner cavity 34 of the lower mold 3 through another third through hole 43 of the fifth inner cavity 42 and another second through hole 36 of the lower mold 3. Preferably, with the axis of the core mold 2 as the center, the two second through holes 36 are located on the same radial line, and the corresponding two third through holes 43 are located on the same radial line. In the third inner cavity 33, the air pipe 35 is close to one lower partition 32, and the second through hole 36 is close to another lower partition 32. Similarly, in the fourth inner cavity 34, the air pipe 35 is close to one lower partition 32, and the second through hole 36 is close to another lower partition 32, so that the circumferential flow distance of the heat medium in the same cavity is maximized, and the heat medium can uniformly fill the third inner cavity 33 and the fourth inner cavity 34.

[0053] In one specific technical solution, the fifth inner cavity 42 of the upper mold 4 is provided with six upper partitions 44 that divide the fifth inner cavity 42 into six equal parts. The top of the four upper partitions 44 near the two third through holes 43 is provided with first flow holes 45, and the bottom of the two upper partitions 44 away from the two third through holes 43 is provided with second flow holes 46.

[0054] In the above technical solution, the upper mold 4 includes a hollow upper mold body 41, the hollow part being the fifth inner cavity 42, and the heat medium can flow in a wave-like manner in the six equally divided fifth inner cavity 42, so that the heat medium can fully fill the fifth inner cavity 42.

[0055] In one specific technical solution, the lower mold 3 and the upper mold 4 are provided with a sealing mechanism 6. The sealing mechanism 6 includes four first sealing plugs 61 that slide through two second through holes 36 and two third through holes 43. The mating ends of the upper and lower first sealing plugs 61 are respectively provided with grooves 62 and first springs 63 for driving the first sealing plugs 61 to rise and fall. The side wall of the groove 62 is provided with a first connecting hole 64. When the mold is closed, the first connecting hole 64 extends into the third inner cavity 33, the fourth inner cavity 34 or the fifth inner cavity 42. When the mold is opened, the first connecting hole 64 extends into the second through hole 36 and the third through hole 43.

[0056] In the above technical solution, the sealing mechanism 6 can block the second through hole 36 of the lower mold 3 and the third through hole 43 of the upper mold 4 when the mold is opened to prevent leakage of the heat medium. When the mold is closed, it connects the second through hole 36 and the third through hole 43 to ensure the circulation of the heat medium. When the mold is closed, the upper mold 4 and the lower mold 3 are sealed and abutted, the first spring 63 is compressed, and the grooves 62 on the two first sealing plugs 61 of the lower mold 3 are connected to the grooves 62 on the two first sealing plugs 61 of the upper mold 4. The upper mold 4 pushes the two first sealing plugs 61 on the lower mold 3 to move down to the lowest point, so that the first connecting hole 64 on one first sealing plug 61 is connected to the third inner cavity 33, and the first connecting hole 64 on the other first sealing plug 61 is connected to the fourth inner cavity 34. At the same time, the lower mold 3 pushes the two first sealing plugs 61 on the upper mold 4 to move up to the highest point, so that the first connecting holes 64 on the two first sealing plugs 61 are connected to the fifth inner cavity 42. This allows the heat medium to circulate between the lower mold 3 and the upper mold 4. When the mold opens, the upper mold 4 moves away from the lower mold 3. The first spring 63 on the lower mold 3 pushes the first sealing plug 61 to rise, and the first connecting hole 64 on the first sealing plug 61 moves into the second through hole 36. The first sealing plug 61 blocks the second through hole 36, and the heat medium in the lower mold 3 cannot flow out from the second through hole 36. Similarly, the first spring 63 on the upper mold 4 pushes the first sealing plug 61 to fall, and the first connecting hole 64 on the first sealing plug 61 moves into the third through hole 43. The first sealing plug 61 blocks the third through hole 43, and the heat medium in the upper mold 4 cannot flow out from the third through hole 43.

[0057] In one specific technical solution, the first sealing plug 61 includes a sealing plug body 611. The opening end of the sealing plug body 611 is provided with a first limiting flange 612, and the closed end is provided with a second limiting flange 613. The second limiting flange 613 is located in the third inner cavity 33, the fourth inner cavity 34, or the fifth inner cavity 42. The lower end face of the upper mold 4 and the upper end face of the lower mold 3 are respectively provided with limiting grooves 65 for accommodating the first limiting flange 612. The bottom of the limiting groove 65 is provided with a spring groove 66 for installing the first spring 63. The sealing plug body 611, the second through hole 36, and the third through hole 43 are all rectangular.

[0058] In the above technical solution, the sealing plug body 611 and the third through hole 43 are rectangular, which can position the first sealing plug 61 circumferentially, avoid slippage, and improve the stability of use.

[0059] In one specific technical solution, the upper end face of the lower mold 3 is provided with a vertical slide groove 37 extending into the lower partition plate 32. A second sealing plug 38 is slidably disposed in the slide groove 37. A second spring 39 connected to the second sealing plug 38 is provided at the bottom of the slide groove 37. The side wall of the lower partition plate 32 is provided with a second connecting hole 321 communicating with the slide groove 37. A third connecting hole 381 is provided on the second sealing plug 38. When the mold is closed, the second sealing plug 38 blocks the second connecting hole 321 on the lower partition plate 32. When the mold is opened, the third connecting hole 381 on the second sealing plug 38 communicates with the second connecting hole 321.

[0060] In the above technical solution, during mold closing, the second sealing plug 38 can block the second connecting hole 321 on the lower partition plate 32 in the lower mold 3, separating the third inner cavity 33 and the fourth inner cavity 34, without interfering with the circulation of the heat medium between the lower mold 3 and the upper mold 4. During mold opening, the third connecting hole 381 on the second sealing plug 38 can communicate with the second connecting hole 321 on the lower partition plate 32, allowing the third inner cavity 33 and the fourth inner cavity 34 to communicate with each other. The heat medium can form a circulation between the lower mold 3 and the core mold 2 without shutting down the heat medium circulation equipment, thus improving work efficiency. During mold closing, the upper mold 4 and the lower mold 3 are sealed and abutted together. When the mold 4 pushes the second sealing plug 38 down to the lowest point, the third connecting hole 381 on the second sealing plug 38 is misaligned with the second connecting hole 321 on the lower partition plate 32. The second sealing plug 38 blocks the second connecting hole 321 on the lower partition plate 32, preventing the hot medium from flowing between the third inner cavity 33 and the fourth inner cavity 34. When the mold is opened, the upper mold 4 moves away from the lower mold 3, and the second spring 39 pushes the second sealing plug 38 up. The third connecting hole 381 on the second sealing plug 38 connects with the second connecting hole 321 on the lower partition plate 32, allowing the hot medium to flow between the third inner cavity 33 and the fourth inner cavity 34.

[0061] The working principle and process of this embodiment are as follows: During injection, the core mold 2, lower mold 3, and upper mold 4 are in the closed state. The sealing mechanism 6 connects the second through hole 36 of the lower mold 3 and the third through hole 43 of the upper mold 4. The third inner cavity 33 and the fourth inner cavity 34 of the lower mold 3 are connected to the fifth inner cavity 42 of the upper mold 4. The second sealing plug 38 on the lower mold 3 blocks the second connecting hole 321 on the lower partition plate 32. The third inner cavity 33 and the fourth inner cavity 34 of the lower mold 3 are not connected. The heat medium circulation system is started. The heat medium circulation system flows from the air inlet channel 26 to the first inner cavity 24 of the core mold 2. The heat medium enters from the first inner cavity 24 into the third inner cavity 33 of the lower mold 3, from the third inner cavity 33 into the fifth inner cavity 42 of the upper mold 4, from the fifth inner cavity 42 into the fourth inner cavity 34 of the lower mold 3, from the fourth inner cavity 34 into the second inner cavity 25 of the core mold 2, and finally flows back to the heat medium circulation system through the air outlet channel 27 of the second inner cavity 25. During demolding, the upper cylinder 15 drives the sliding table 13 and the upper mold 4 and injection cylinder 5 on the sliding table 13 to rise, and the lower cylinder 14 drives the core mold 2 to rise and detach from the lower mold 3. The first sealing plug 61 of the sealing mechanism 6 seals the mold. The lower mold 3 has a second through hole 36 and an upper mold 4 has a third through hole 43. The heat medium in the upper mold 4 is sealed in the fifth inner cavity 42, and the heat medium in the lower mold 3 is sealed in the third inner cavity 33 and the fourth inner cavity 34. At the same time, the second sealing plug 38 on the lower mold 3 rises, and the third connecting hole 381 on the second sealing plug 38 connects with the second connecting hole 321 on the lower partition plate 32. The third inner cavity 33 and the fourth inner cavity 34 of the lower mold 3 are connected, and they are also connected to the first inner cavity 24 and the second inner cavity 25 of the core mold 2 through the air pipe 35. The heat medium circulation system circulates between the lower mold 3 and the core mold 2. The heat medium is introduced into the first inner cavity 24 of the core mold 2 through the air inlet channel 26. The heat medium enters the third inner cavity 33 of the lower mold 3 from the first inner cavity 24, enters the fourth inner cavity 34 from the third inner cavity 33, enters the second inner cavity 25 of the core mold 2 from the fourth inner cavity 34, and finally flows back to the heat medium circulation system through the air outlet channel 27 of the second inner cavity 25. After the tire vulcanizing bladder is demolded from the core mold 2, the upper mold 4 and the core mold 2 are driven to descend by the upper cylinder 15 and the lower cylinder 14. The upper mold 4, the lower mold 3 and the core mold 2 re-enter the mold closing state, ready for the next injection molding. Example 2

[0062] Combined with appendix Figure 1-11 This embodiment provides a production process for a tire vulcanizing bladder production apparatus, including the following steps:

[0063] Step S1: Add the measured butyl rubber, carbon black, zinc oxide, stearic acid, castor oil, antioxidant and vulcanizing agent to a mixer and mix at 100-120℃ for 15-30 minutes to obtain the mixed rubber.

[0064] Step S2: Add the intensive rubber to the open mill and mix at 75-85℃ for 15-30 minutes to obtain the open rubber sheet;

[0065] Step S3: With the tire vulcanizing bladder production device in the closed state, the heat medium circulation system is activated. The heat medium circulation system introduces heat medium into the first inner cavity 24 of the core mold 2 through the air inlet channel 26. The heat medium enters the third inner cavity 33 of the lower mold 3 from the first inner cavity 24, enters the fifth inner cavity 42 of the upper mold 4 from the third inner cavity 33, enters the fourth inner cavity 34 of the lower mold 3 from the fifth inner cavity 42, enters the second inner cavity 25 of the core mold 2 from the fourth inner cavity 34, and finally flows back to the heat medium circulation system through the air outlet channel 27 of the second inner cavity 25. The core mold 2, lower mold 3, and upper mold 4 are heated to 150-180℃.

[0066] Step S4: Add the open-processed rubber sheet into the injection cylinder 5 of the tire vulcanizing bladder production device. The temperature of the injection cylinder 5 is 75-85℃. The injection cylinder 5 injects rubber material into the mold cavity of the tire vulcanizing bladder production device. The injection pressure is 10-20MPa. After injection, vulcanize at 150-180℃ for 40-50 minutes to obtain the tire vulcanizing bladder.

[0067] Step S5: Open the mold, remove the tire vulcanizing capsule from the core mold 2, and then close the mold for the next injection vulcanization.

[0068] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A tire vulcanizing bladder production apparatus, comprising a frame (1), characterized in that, The frame (1) is provided with a core mold (2), a lower mold (3), an upper mold (4) and an injection cylinder (5) that docks with the upper mold (4). The core mold (2) is provided with a first inner cavity (24) and a second inner cavity (25). The first inner cavity (24) is connected to an air inlet channel (26), and the second inner cavity (25) is connected to an air outlet channel (27). The air inlet channel (26) and the air outlet channel (27) are connected to a heat medium circulation system. The lower mold (3) is provided with a third inner cavity (33) that is connected to the first inner cavity (24) and a fourth inner cavity (34) that is connected to the second inner cavity (25). The upper mold (4) is provided with a fifth inner cavity (42) that is connected to the third inner cavity (33) and the fourth inner cavity (34). The core mold (2) includes a hollow core mold body (21) and two inner partitions (22) that divide the core mold body (21) into a first inner cavity (24) and a second inner cavity (25); the lower mold (3) includes a hollow lower mold body (31) and two lower partitions (32) that divide the lower mold body (31) into a third inner cavity (33) and a fourth inner cavity (34). The core mold (2) has a central shaft (23) that slides through the lower mold (3) at its center. The central shaft (23) has an air inlet channel (26) and an air outlet channel (27) inside. The air inlet channel (26) and the air outlet channel (27) are inverted "L" shape and extend from the lower end face of the central shaft (23) to the top of its side wall. The bottom of the first inner cavity (24) and the second inner cavity (25) are respectively provided with a first through hole (28). The inner side walls of the third inner cavity (33) and the fourth inner cavity (34) are respectively provided with "L" shaped air pipes (35). The vertical section of the air pipe (35) is sealed and slidably inserted into the first through hole (28). The top of the third inner cavity (33) and the fourth inner cavity (34) are respectively provided with a second through hole (36), and the bottom of the fifth inner cavity (42) is provided with two third through holes (43) that are correspondingly connected to the two second through holes (36). The lower mold (3) and the upper mold (4) are provided with a sealing mechanism (6). The sealing mechanism (6) includes four first sealing plugs (61) that slide through two second through holes (36) and two third through holes (43). The mating ends of the upper and lower first sealing plugs (61) are respectively provided with grooves (62) and first springs (63) that drive the first sealing plugs (61) to rise and fall. The side wall of the groove (62) is provided with a first connecting hole (64). When the mold is closed, the first connecting hole (64) extends into the third inner cavity (33), the fourth inner cavity (34) or the fifth inner cavity (42). When the mold is opened, the first connecting hole (64) extends into the second through hole (36) and the third through hole (43). The first sealing plug (61) includes a sealing plug body (611). The opening end of the sealing plug body (611) is provided with a first limiting flange (612), and the closed end is provided with a second limiting flange (613). The second limiting flange (613) is located in the third inner cavity (33), the fourth inner cavity (34), or the fifth inner cavity (42). The lower end face of the upper mold (4) and the upper end face of the lower mold (3) are respectively provided with limiting grooves (65) for accommodating the first limiting flange (612). The bottom of the limiting groove (65) is provided with a spring groove (66) for installing the first spring (63). The sealing plug body (611), the second through hole (36), and the third through hole (43) are all rectangular. The upper end face of the lower mold (3) is provided with a vertical slide groove (37) extending into the lower partition plate (32). A second sealing plug (38) is slidably provided in the slide groove (37). A second spring (39) connected to the second sealing plug (38) is provided at the bottom of the slide groove (37). A second connecting hole (321) communicating with the slide groove (37) is provided on the side wall of the lower partition plate (32). A third connecting hole (381) is provided on the second sealing plug (38). When the mold is closed, the second sealing plug (38) blocks the second connecting hole (321) on the lower partition plate (32). When the mold is opened, the third connecting hole (381) on the second sealing plug (38) communicates with the second connecting hole (321).

2. The tire vulcanizing bladder production apparatus according to claim 1, characterized in that, The frame (1) includes a gantry (11), which has a fixed platform (12) and a sliding platform (13) from bottom to top. The fixed platform (12) has a core mold (2), a lower mold (3) and a lower cylinder (14) for driving the core mold (2) to rise and fall. The sliding platform (13) has an upper mold (4) and an injection cylinder (5). The top of the gantry (11) has an upper cylinder (15) for driving the sliding platform (13) to rise and fall.

3. The tire vulcanizing bladder production apparatus according to claim 2, characterized in that, The upper mold (4) has six upper partitions (44) in the fifth inner cavity (42) that divide the fifth inner cavity (42) into six equal parts. The top of the four upper partitions (44) near the two third through holes (43) is provided with a first flow hole (45), and the bottom of the two upper partitions (44) away from the two third through holes (43) is provided with a second flow hole (46).

4. A manufacturing process for tire vulcanizing bladders, characterized in that, Using the tire vulcanizing bladder production apparatus according to claim 3 includes the following steps: Step S1: Add the measured butyl rubber, carbon black, zinc oxide, stearic acid, castor oil, antioxidant and vulcanizing agent to a mixer and mix at 100-120℃ for 15-30 minutes to obtain the mixed rubber. Step S2: Add the intensive rubber to the open mill and mix at 75-85℃ for 15-30 minutes to obtain the open rubber sheet; Step S3: With the tire vulcanizing bladder production device in the closed state, the heat medium circulation system is turned on. The heat medium circulation system introduces heat medium into the first inner cavity (24) of the core mold (2) through the air inlet channel (26). The heat medium enters the third inner cavity (33) of the lower mold (3) from the first inner cavity (24), enters the fifth inner cavity (42) of the upper mold (4) from the third inner cavity (33), enters the fourth inner cavity (34) of the lower mold (3) from the fifth inner cavity (42), enters the second inner cavity (25) of the core mold (2) from the fourth inner cavity (34), and finally flows back to the heat medium circulation system through the air outlet channel (27) of the second inner cavity (25), heating the core mold (2), lower mold (3), and upper mold (4) to 150-180℃. Step S4: Add the open-processed rubber sheet into the injection cylinder (5) of the tire vulcanizing capsule production device. The temperature of the injection cylinder (5) is 75-85℃. The injection cylinder (5) injects rubber material into the mold cavity of the tire vulcanizing capsule production device. The injection pressure is 10-20MPa. After injection, vulcanize at 150-180℃ for 40-50 minutes to obtain the tire vulcanizing capsule. Step S5: Open the mold, remove the tire vulcanizing capsule from the core mold (2), and then close the mold for the next injection vulcanization.

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