A tire curing bladder production device and use method thereof

Abstract

The present invention relates to the technical field of tire vulcanization bladder production, and in particular to a tire vulcanization bladder production device and a method of using the same. The tire vulcanization bladder production device includes a frame, a lifting mechanism and a core mold are provided on the frame, 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, the pressure plate, the upper mold and the lower mold can be closed to form a molding cavity, a feed pipe connected to the molding cavity is provided at the center of the pressure plate, the feed pipe seal can slide through the upper mold and then connect to the injection cylinder, and a demoulding airway connecting the molding cavity and an external air source is provided in the core mold. The present invention can achieve fast and safe demoulding, automatically cut off the upper cover, improve production efficiency, reduce the labor intensity of workers, and can evenly heat the core mold to obtain high-quality tire vulcanization bladders.

Description

Technical Field

[0001] The invention relates to the technical field of tire vulcanization bladder production, and in particular to a tire vulcanization bladder production device and a use method thereof. Background Art

[0002] Tire curing bladder is a hollow thin-walled rubber product of a tire vulcanizer, which is used to load the inner cavity of the tire blank to be vulcanized, and then pass a heating medium to cooperate with the vulcanizer for shaping and vulcanization. The existing tire curing bladder molding method is mainly a molding method and an injection method. The injection method is to inject rubber into the mold cavity by an injection machine after the upper mold, lower mold and core mold are molded together. The tire curing bladder prepared by the injection method is generally demoulded by an inflation demoulding method. After the upper mold, lower mold and core mold are opened, compressed air is filled into the tire curing bladder that is close to the core mold, and the bladder is blown out of the core mold to complete the demoulding. Since there is no fixing device in the outside world during demoulding, the tire curing bladder in a high-temperature state that is blown out will be ejected everywhere, which is not only easy to burn people and cause safety accidents, but also causes pollution to the surface of the tire curing bladder due to collision, affecting product quality.

[0003] Patent application number 201120341016.0 discloses an injection machine for producing tire curing bladders. A demolding mechanism is arranged on one side of the injection station. After the tire curing bladder is injection molded at the injection station, the mold is opened first, and then the lower mold and the core mold are moved to the bottom of the demolding mechanism through the lower movable workbench, and the core mold is pushed upward and separated from the lower mold. A fixing device is arranged on the demolding mechanism, and the fixing device is pressed on the tire curing bladder. The tire curing bladder is inflated in the center hole of the fixing device, so that the tire curing bladder is separated from the core mold. The above technical scheme can avoid the problem that the tire curing bladder flies around and injures people after being ejected from the mold or the bladder surface is polluted due to the flying of the bladder. However, this technical solution has the following problems: injection molding and inflation demolding are carried out in two different workstations. After injection molding, the mold needs to be opened first, and then the lower mold and the core mold are moved to the demolding workstation, which affects the work efficiency. In addition, when the tire vulcanization bladder is injection molded, due to the structural characteristics of the mold itself, an upper cover will be formed on the top of the tire vulcanization bladder. After demolding, the upper cover needs to be manually cut off, which increases the labor intensity and reduces the production efficiency.

[0004] The invention of the patent with application number 200810019457.1 discloses a radial tire injection curing bladder mold, comprising an upper mold, a lower mold, and a core mold. An injection hole communicating with the mold cavity is arranged above the mold cavity formed by the upper, lower molds and the core mold. A vacuum channel communicating with the mold cavity is arranged below the mold cavity. The exhaust ribs in the mold cavity are integrated with the mold. A guide baffle for the heat-conducting medium is arranged in the outer cavity of the upper and lower molds. The guide baffle is a plurality of pieces and arranged radially. The above structure is a common mold structure for tire curing bladder injection molding. There are the following technical problems: first, the heat medium enters the heating cavity of the core mold at a fixed point, and the temperature at the entry point is significantly higher than that at other positions, which easily causes uneven heating of the core mold and affects the curing quality. Second, the heat medium flows spontaneously in the heating cavity. Since the heating cavity of the core mold has a large space, the heat medium diffuses unevenly, which further causes uneven heating of the core mold and reduces the curing quality.

[0005] In summary, there is an urgent need to provide a tire vulcanization bladder production device that can quickly and safely demold, automatically cut off the upper cover, improve production efficiency, reduce the labor intensity of workers, and can evenly heat the core mold to obtain high-quality tire vulcanization bladders. Summary of the invention

[0006] In order to solve at least one of the above technical problems, the present invention provides a tire vulcanization bladder production device, including a frame, a lifting mechanism and a core mold are provided on the frame, the lifting mechanism is connected to 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, the pressure plate, the upper mold and the lower mold can be closed to form a molding cavity, a feed pipe connected to the molding cavity is provided at the center of the pressure plate, the feed pipe seal can slide through the upper mold and then connect to the injection cylinder, and a demolding air channel connecting the molding cavity and an external air source is provided in the core mold.

[0007] Preferably, the lifting mechanism includes two upper mold cylinders, a lifting plate and two lower mold cylinders. The piston rod of the upper mold cylinder can slide through the lifting plate and then be connected to the upper mold. The piston rod of the lower mold cylinder is connected to the lower mold. The upper end surface of the lifting plate is fixedly connected to the injection barrel, and the injection head of the injection barrel passes through the lifting plate and then is connected to the feed pipe.

[0008] Preferably, the frame includes four columns arranged in a rectangular shape, and upper and lower tables arranged at intervals on the columns. A damping sleeve is provided on the column, and a sliding hole cooperating with the column is provided on the lifting plate. In the mold closing state, the sliding hole cooperates with the damping sleeve in damping. The upper mold cylinder is fixedly provided on the upper table, and an upper through hole for the injection barrel to pass through is provided at the center. The core mold and lower mold cylinder are fixedly provided on the lower table.

[0009] Preferably, the core mold includes a core barrel, a circular opening is provided on the top of the core barrel, a first hollow shaft is fixedly connected to the bottom, a center shaft is provided inside, a sealing cover is provided at the circular opening, a demolding air hole is axially provided on the sealing cover, a one-way valve is provided in the demolding air hole, the first hollow shaft can be slidably passed through the lower mold and then fixed on the frame, a vacuum air passage connected to the molding cavity is provided inside, the center shaft seal extends out of the first hollow shaft and is fixed to the frame, and a demolding air passage connected to the demolding air hole is provided in the center shaft.

[0010] Preferably, the central shaft includes a fixed shaft, the fixed shaft seal is rotatably sleeved with a second hollow shaft, a plurality of rotating blades are equidistantly arranged on the circumference of the second hollow shaft, the bottom seal is rotatably passed through the first hollow shaft and connected to the rotating drive mechanism, a heat medium inlet channel and the demoulding air channel are arranged in the fixed shaft, a first annular groove connected to the heat medium inlet channel is arranged on the inner side wall of the second hollow shaft, a heat medium inlet hole connected to the first annular groove is arranged above the side wall of the rotating blade, and a heat medium outflow channel connected to the core barrel is arranged on the first hollow shaft.

[0011] Preferably, the rotary drive mechanism includes a motor fixed on the frame, the output end of the motor is connected to the first gear, the first gear meshes with the second gear, and the second gear is connected to the second hollow shaft; the pressure plate also includes a plug-in cylinder with an opening at the bottom, the plug-in cylinder is coaxially fixed in the feed pipe through a connecting rod, and together with the feed pipe forms an annular feed area, the plug-in cylinder can be slidably plugged into the top of the fixed shaft, and the bottom of the pressure plate is spaced a certain distance from the sealing cover.

[0012] Preferably, the sealing cover is fixed on the fixed shaft, and the side wall and the circular opening form an annular space. A cutting mechanism is provided at the bottom, and the cutting mechanism includes a first rotating ring connected to the second hollow shaft, and the outer wall of the first rotating ring can rotatably cover the second rotating ring, and the outer wall of the second rotating ring is threadedly connected to the annular cutter. The annular cutter seals the annular space and can slide vertically in the annular space. A plug rod that can be radially extended under control is provided in the first rotating ring, and a plug groove corresponding to the plug rod is provided on the inner side wall of the second rotating ring.

[0013] Preferably, an annular groove is provided on the top of the first swivel, and the annular groove is sealed and connected to the demoulding air hole of the sealing cover, a radial groove is provided on the bottom, an inner radial hole is provided on the inner wall, and an outer radial hole is provided on the outer wall. The inner side wall of the first swivel is provided with a second annular groove connected to the inner radial hole, and the second annular groove is sealed and connected to the demoulding air duct. The plug-in rod seal can be slidably inserted in the inner radial hole and the outer radial hole. A sliding block matching the radial sliding groove is provided at the bottom, and a spring is provided on the sliding block, and the spring is fixed in the annular groove.

[0014] Preferably, the annular cutter includes an annular knife seat that seals the annular space, an annular blade is provided on the top of the annular knife seat, a vertical slide groove is provided on the outer wall, a thread matching the second swivel ring is provided at the bottom of the inner wall, a vertical guide rod matching the vertical slide groove is provided on the side wall of the circular opening, a limiting flange is provided at the bottom, the second swivel ring is rotatably connected to the limiting flange, and the annular blade is aligned with the sub-mouth of the forming cavity.

[0015] The present invention provides a method for using a tire curing bladder production device, comprising the following steps:

[0016] Step S100. Injection molding: The lifting mechanism controls the upper mold, the lower mold, the injection cylinder and the pressure plate connected to the injection cylinder to enter the mold closing state, preheats the upper mold, the lower mold and the core mold, and evacuates the molding cavity at the same time, injects the rubber into the feed pipe of the pressure plate through the injection cylinder, and the rubber flows into the molding cavity of the tire curing bladder through the feed pipe, and is heated to a specified time to vulcanize the rubber;

[0017] Step S200. Inflation and demolding: After the vulcanization is completed, the heating is stopped, and the upper and lower molds are controlled to open and move away from the core mold through the lifting mechanism. At this time, the injection cylinder and the pressure plate are stationary, and the pressure plate presses the upper cover formed by the rubber material, and the demolding air channel is inflated. The gas enters the molding cavity, and the molded tire vulcanization bladder expands until it is separated from the core mold. After the tire vulcanization bladder is demolded, the injection cylinder and the pressure plate connected to the injection cylinder are controlled by the lifting mechanism to move upward to take out the tire vulcanization bladder.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects:

[0019] 1. The molding cavity of the tire curing bladder is formed by the upper mold, lower mold, core mold and pressure plate. The pressure plate is directly connected to the injection cylinder as a separate movable part. The up and down movement of the pressure plate is controlled by controlling the lifting of the injection cylinder. The inflation and demoulding are completed directly at the injection molding station. The upper cover of the tire curing bladder is pressed by the pressure plate, and the tire curing bladder will not fly. After demoulding, the injection cylinder and the pressure plate connected to the injection cylinder are controlled to move up by the lifting mechanism, and then the tire curing bladder can be taken out, which realizes safe and fast demoulding directly at the injection molding station, improving production efficiency;

[0020] 2. A rotating blade is arranged in the core mold, and a heat medium inflow hole connected to the heat medium inflow channel is provided on the rotating blade, so that the heat medium can enter the core barrel in a rotating state, and the heat is evenly distributed. At the same time, the rotating stirring of the rotating blade can greatly improve the heating uniformity of the core barrel and improve the vulcanization quality of the tire vulcanization bladder;

[0021] 3. A cutter mechanism is provided in the core mold. During injection molding, the first rotating ring of the cutter mechanism rotates alone. After demoulding is completed, the first rotating ring and the second rotating ring of the cutter mechanism are circumferentially locked. The first rotating ring and the second rotating ring are driven to rotate by the rotary drive mechanism, and the annular cutter threadedly connected with the second rotating ring moves upward to cut off the upper cover of the tire curing bladder, thereby realizing automatic cutting of the upper cover, reducing the labor intensity of workers and improving work efficiency.

[0022] In summary, the present invention can achieve fast and safe demoulding, automatically cut off the upper cover, improve production efficiency, reduce the labor intensity of workers, and can evenly heat the core mold to obtain a high-quality tire curing bladder. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front view of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the rack;

[0025] Figure 3 It is a structural schematic diagram of the lifting mechanism;

[0026] Figure 4 It is a structural schematic diagram of a pressure plate;

[0027] Figure 5 is a structural schematic diagram of a rotary drive mechanism;

[0028] Figure 6 This is an exploded view of the core mold;

[0029] Figure 7 It is a structural schematic diagram of a one-way valve;

[0030] Figure 8 It is an exploded view of the cutter mechanism;

[0031] Fig. 9 It is a structural schematic diagram of the upper mold, the lower mold and the core mold in the mold closing state;

[0032] Fig.10 for Fig. 9 A partial enlarged view of middle A.

[0033] Description of reference numerals:

[0034] 1. Frame, 11. Column, 111. Damping sleeve, 12. Upper table, 121. Upper through hole, 13. Lower table, 2. Lifting mechanism, 21. Upper die cylinder, 22. Lifting plate, 221. Sliding hole, 23. Lower die cylinder, 3. Core die, 31. Core barrel, 311. Circular opening, 312. Vertical guide rod, 313. Limiting flange, 32. First hollow shaft, 321. Hot medium outflow channel, 322. Vacuum air channel, 33. Central axis, 331. Fixed axis, 3311. Heat medium inflow channel, 3312. Demolding air channel, 3313. Mounting flange, 332. Second hollow shaft, 3321. First annular groove, 333. Rotating blade, 3331. Heat medium inflow hole, 34. Sealing cover, 341. Demolding air hole, 3411. Conical hole, 3412. Circular hole, 3413. Sliding groove, 35. One-way valve, 351. Valve core, 352. Valve stem, 353. Sliding rod, 36. Cutter mechanism, 361. First rotating ring, 3611. Annular groove, 3612. Radial sliding groove, 3613. Inner radial hole, 3614. Outer radial hole, 3615. Second annular groove, 362. Second rotating ring, 3621. Plug-in groove, 363. Annular cutter, 3631. Annular knife seat, 3632. Annular blade, 3633. Vertical sliding groove, 364. Plug-in rod, 3641. Sliding block, 3642. Spring, 37. Core heating chamber, 4. Press plate, 41. Feed pipe, 42. Plug-in cylinder, 43. Connecting rod, 5. Upper mold, 51. Upper heating chamber, 6. Lower mold, 61. Lower heating chamber, 7. Injection cylinder, 8. Rotation driving mechanism, 81. Motor, 82. First gear, 83. Second gear, 9. Molding cavity. DETAILED DESCRIPTION

[0035] The specific implementation of the present invention is described below in conjunction with the accompanying drawings and embodiments:

[0036] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0037] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content. Example 1

[0038] Combined with Figure 1-10 The present embodiment provides a tire curing bladder production device, including a frame 1, on which a lifting mechanism 2 and a core mold 3 are provided, the lifting mechanism 2 is connected to an upper mold 5, a lower mold 6 and an injection cylinder 7, a pressure plate 4 is provided between the core mold 3 and the upper mold 5, the core mold 3, the pressure plate 4, the upper mold 5 and the lower mold 6 can be closed to form a molding cavity 9, a feed pipe 41 connected to the molding cavity 9 is provided at the center of the pressure plate 4, the feed pipe 41 is sealed and can slide through the upper mold 5 and then connected to the injection cylinder 7, and a demolding airway 3312 connecting the molding cavity 9 and an external air source is provided in the core mold 3.

[0039] In the above technical solution, the pressure plate 4 is not a fixed component of the core mold 3 or the upper mold 5, but is directly connected to the injection cylinder 7 as a separate movable component, and the pressure plate 4 is controlled to move up and down by the injection cylinder 7; during the injection molding of the tire curing bladder, the lifting mechanism 2 controls the upper mold 5, the lower mold 6, the injection cylinder 7 and the pressure plate 4 connected to the injection cylinder 7 to enter the mold closing state, and the rubber is injected into the feed pipe 41 of the pressure plate 4 through the injection cylinder 7. The rubber flows into the molding cavity 9 of the tire curing bladder through the feed pipe 41 for vulcanization molding. During the flow of the rubber, a rubber material will be formed between the feed pipe 41 and the molding cavity 9. The molded tire vulcanization bladder is molded into a circular upper cover. After vulcanization is completed, the upper mold 5 and the lower mold 6 are opened and away from the core mold 3 by controlling the lifting mechanism 2. At this time, the injection cylinder 7 and the pressure plate 4 are stationary. The pressure plate 4 can press the upper cover formed by the rubber material, and inflate the demoulding air channel 3312. The gas enters the molding cavity 9, and the molded tire vulcanization bladder expands until it is separated from the core mold 3. Since the pressure plate 4 presses the upper cover of the tire vulcanization bladder, no flying occurs. After the tire vulcanization bladder is demolded, the injection cylinder 7 and the pressure plate 4 connected to the injection cylinder 7 are controlled to move upward by the lifting mechanism 2, and then the tire vulcanization bladder can be taken out.

[0040] In the above technical scheme, the lifting mechanism 2 can be three groups of lifting drive components such as air / hydraulic cylinders or screws respectively connected to the upper mold 5, the lower mold 6 and the injection cylinder 7. The frame 1 can be configured accordingly according to the specific terrain structure of the factory building. The upper mold 5, the lower mold 6 and the core mold 3 can directly adopt the conventional structure settings in the prior art, which is not a limiting part of the present invention. For example, the mold structure in the invention patent with application number 200810019457.1 can be directly adopted, that is, the upper mold 5 is provided with an upper heating cavity 51, the lower mold 6 is provided with a lower heating cavity 61, and the core mold 3 is provided with a core heating cavity 37. The upper heating cavity 51, the lower heating cavity 61 and the core heating cavity 37 are respectively connected to the heat medium circulation system.

[0041] In a specific technical scheme, the lifting mechanism 2 includes two upper mold cylinders 21, a lifting plate 22 and two lower mold cylinders 23. The piston rod of the upper mold cylinder 21 can slide through the lifting plate 22 and then connect to the upper mold 5. The piston rod of the lower mold cylinder 23 is connected to the lower mold 6. The upper end surface of the lifting plate 22 is fixedly connected to the injection cylinder 7. The injection head of the injection cylinder 7 passes through the lifting plate 22 and then connects to the feed pipe 41.

[0042] In the above technical scheme, by setting the lifting plate 22, the lifting and lowering of the upper mold 5 and the injection cylinder 7 can be simultaneously controlled by the upper mold cylinder 21. It should be noted that in order to ensure that the upper mold 5 is not interfered by the injection cylinder 7 during the upward movement, and to ensure that the upper mold 5 can be smoothly moved up to the mold opening height, the length of the feed tube 41 of the pressure plate 4 can be extended, or the size of the injection cylinder 7 can be designed to be smaller than the outer diameter of the feed tube 41, or the injection head of the injection cylinder 7 (the outer diameter of the injection head is smaller than the outer diameter of the feed tube 41) can be extended. This embodiment adopts the last structure. When the mold is closed, the lower mold cylinder 23 controls the lower mold 6 to move up, and the upper mold cylinder 21 controls the upper mold 5 to move down. During the downward movement of the upper mold 5, it abuts against the pressure plate 4, driving the pressure plate 4, the injection cylinder 7 and the lifting plate 22 to move down until the pressure plate 4, the upper mold 5 and the lower mold 6 are sealed and closed with the core mold 3 to form a molding cavity 9; when the mold is opened, the lower mold cylinder 23 controls the lower mold 6 to move down away from the core mold 3, and the upper mold cylinder 21 controls the upper mold 5 to move up away from the core mold 3. Since the piston rod of the upper mold cylinder 21 can slide through the lifting plate 22, the lifting plate 22 remains motionless under the action of its own gravity and the gravity of the injection cylinder 7 and the pressure plate 4. At this time, inflation and demolding can be carried out. When the demolding is completed, the upper mold cylinder 21 continues to move up, and the upper mold 5 abuts against the lifting plate 22. The lifting plate 22, the injection cylinder 7 and the pressure plate 4 can move up with the upper mold 5 away from the core mold 3. At this time, the tire vulcanization bladder can be taken out.

[0043] In a specific technical solution, the frame 1 includes four rectangularly arranged columns 11, and an upper table 12 and a lower table 13 arranged at intervals on the columns 11. A damping sleeve 111 is provided on the column 11, and a sliding hole 221 cooperating with the column 11 is provided on the lifting plate 22. In the mold closing state, the sliding hole 221 is damped by the damping sleeve 111. The upper mold cylinder 21 is fixedly provided on the upper table 12, and an upper through hole 121 is provided at the center for the injection cylinder 7 to pass through. The core mold 3 and the lower mold cylinder 23 are fixedly provided on the lower table 13.

[0044] In the above technical solution, the damping sleeve 111 can provide damping force for the lifting and lowering of the lifting plate 22. During the inflation and demolding process, the pressure plate 4 can maintain a stable pressing state under the dual effects of gravity and the damping force of the damping sleeve 111, thereby improving the demolding stability.

[0045] In a specific technical scheme, the core mold 3 includes a core barrel 31, a circular opening 311 is provided on the top of the core barrel 31, a first hollow shaft 32 is fixedly connected to the bottom, a center shaft 33 is provided inside, a sealing cover 34 is provided at the circular opening 311, a demolding air hole 341 is axially provided on the sealing cover 34, a one-way valve 35 is provided in the demolding air hole 341, the first hollow shaft 32 can be slidably passed through the lower mold 6 and then fixed on the frame 1, a vacuum air duct 322 connected to the molding cavity 9 is provided inside, the center shaft 33 is sealed and extended out of the first hollow shaft 32 and then fixed on the frame 1, and a demolding air duct 3312 connected to the demolding air hole 341 is provided in the center shaft 33.

[0046] In the above technical solution, the vacuum air channel 322 is used to evacuate the molding cavity 9, and the vacuum air channel 322 is connected to the vacuum pump outside, which is a conventional setting in the field; the circular opening 311 is opened on the top of the core barrel 31, on the one hand, to facilitate the processing of the core barrel 31, and on the other hand, to facilitate the installation of other components in the core barrel 31. It should be noted that the outer surface of the core barrel 31, that is, the inner wall of the molding cavity 9, has a specific shape consistent with the tire vulcanization bladder to be produced, which means that the position of the circular opening 311 is preferably corresponding to the sub-mouth position of the tire vulcanization bladder, which is a conventional structural setting in the field and will not be repeated; in this embodiment, the core barrel 31, the sealing cover 34 and the central shaft 33 can jointly form a closed core heating cavity 37. The demoulding air channel 3312 in the central shaft 33 can be connected to the demoulding air hole 341 in any suitable manner, including but not limited to directly using a connecting pipe for connection, or setting an internal channel connecting the demoulding air hole 341 and the demoulding air channel 3312 in the sealing cover 34.

[0047] The one-way valve 35 is a conventional accessory and can adopt any suitable structure in the prior art. In the present embodiment, in order to simplify the accessory, its structure is optimized and designed. The specific technical scheme is as follows: the one-way valve 35 includes a conical valve core 351, a valve stem 352 is provided at the bottom of the valve core 351, and the bottom of the valve stem 352 is connected to a horizontal sliding rod 353. The demolding hole 341 of the sealing cover 34 includes a conical hole 3411 consistent with the shape of the valve core 351, and the bottom of the conical hole 3411 is connected to a circular hole 3412, and the diameter of the circular hole 3412 is larger than the diameter of the valve stem 352. The side wall of the circular hole 3412 is provided with a vertical sliding groove 3413 that cooperates with the sliding rod 353.

[0048] The working principle and working process of this embodiment are as follows: ① Injection molding: the lifting mechanism 2 controls the upper mold 5, the lower mold 6, the injection cylinder 7 and the pressure plate 4 connected to the injection cylinder 7 to enter the mold closing state, preheat the upper mold 5, the lower mold 6 and the core mold 3, and evacuate the molding cavity 9 at the same time, and inject the rubber into the feed pipe 41 of the pressure plate 4 through the injection cylinder 7. The rubber flows into the molding cavity 9 of the tire vulcanization bladder through the feed pipe 41, and is heated to a specified time to vulcanize the rubber; ② Inflation demoulding: After the vulcanization is completed, the heating is stopped, and the upper mold 5 and the lower mold 6 are controlled by the lifting mechanism 2 to open the mold and move away from the core mold 3. At this time, the injection cylinder 7 and the pressure plate 4 do not move, and the pressure plate 4 presses the upper cover formed by the rubber, and inflates the demoulding air channel 3312. The gas enters the molding cavity 9, and the molded tire vulcanization bladder expands until it is separated from the core mold 3. After the tire vulcanization bladder is demoulded, the injection cylinder 7 and the pressure plate 4 connected to the injection cylinder 7 are controlled by the lifting mechanism 2 to move up, and the tire vulcanization bladder is taken out. Example 2

[0049] Combined with Figure 1-10 This embodiment provides a tire curing bladder production device. On the basis of Embodiment 1, the structure of the core mold 3 is optimized to improve its heating uniformity, thereby improving the vulcanization quality of the tire curing bladder. The specific technical solution is as follows:

[0050] The central shaft 33 includes a fixed shaft 331, and the fixed shaft 331 is sealed and rotatably sleeved with a second hollow shaft 332. A plurality of rotating blades 333 are equidistantly arranged on the circumference of the second hollow shaft 332. The bottom seal can rotate through the first hollow shaft 32 and is connected to the rotating drive mechanism 8. A heat medium inflow channel 3311 and the demoulding air channel 3312 are arranged in the fixed shaft 331, and a first annular groove 3321 communicating with the heat medium inflow channel 3311 is arranged on the inner side wall of the second hollow shaft 332. A heat medium inflow hole 3331 communicating with the first annular groove 3321 is arranged above the side wall of the rotating blade 333, and a heat medium outflow channel 321 communicating with the core barrel 31 is arranged on the first hollow shaft 32.

[0051] In the above technical scheme, the heat medium inflow channel 3311 and the heat medium outflow channel 321 are connected to the heat medium circulation system to heat the core mold 3. A heat medium inflow hole 3331 connected to the heat medium inflow channel 3311 is opened on the rotating blade 333, so that the heat medium can enter the core barrel 31 in a rotating state as the rotating blade 333 rotates. Compared with the traditional fixed-point introduction of heat medium, the rotating introduction of heat medium can greatly improve the heating uniformity of the core barrel 31; the fixed shaft 331 can be a vertical circular shaft with the bottom fixed on the frame 1. The heat medium inflow channel 3311 and the demoulding air channel 3312 extend to the bottom of the fixed shaft 331, and the heat medium circulation system and the external air source are connected from the bottom of the fixed shaft 331. Under this structure, the second hollow shaft 332 needs to be rotatably mounted on the frame 1. This embodiment provides another mounting structure, in which a mounting flange 3313 is provided at the bottom of the fixed shaft 331 to mount the The mounting flange 3313 is fixed on the frame 1, and the heat medium inflow channel 3311 and the demoulding air channel 3312 extend into the mounting flange 3313, and then pass through the side wall of the mounting flange 3313 to connect the heat medium circulation system and the external air source. Under this structure, the second hollow shaft 332 can be directly rotatably mounted on the mounting flange 3313, thereby improving the installation efficiency. When installed in conjunction with the frame 1 in Example 1, the fixed shaft 331, the second hollow shaft 332 and the rotation drive mechanism 8 can be directly mounted on the upper end surface of the lower table 13. In this embodiment, the following structure is preferably adopted, in which the fixed shaft 331 and the second hollow shaft 332 pass through the lower table 13 of the frame 1, and a mounting frame is arranged on the lower end surface of the lower table 13. The mounting flange 3313 of the fixed shaft 331 is fixed on the mounting frame, and the rotation drive mechanism 8 is arranged on the mounting frame. This structure can shorten the telescopic stroke of the piston rod of the lower mold cylinder 23 and ensure the compact structure of the equipment.

[0052] When in use, the driving mechanism 8 drives the second hollow shaft 332 and the rotating blades 333 to rotate. The rotating blades 333 can quickly disperse the heat medium entering the core barrel 31, so that the core barrel 31 is heated evenly, and the rubber in the molding cavity 9 is evenly heated to obtain a high-quality tire curing bladder; in order to further improve the heat dispersion stability, the rotating blades 333 located in the core heating cavity 37 preferably correspond to the barrel wall of the core barrel 31, that is, the inner wall of the core barrel 31 corresponds to the shape of the outer wall, and the outer side wall of the rotating blades 333 corresponds to the shape of the inner wall of the core barrel 31, forming a convex structure that is long in the middle and short at both ends. The rotating driving mechanism 8 can adopt any suitable rotating driving structure, including but not limited to the traditional structure of a belt drive structure, a sprocket drive structure or a gear meshing drive structure with a rotating motor.

[0053] In a specific technical scheme, the rotary drive mechanism 8 includes a motor 81 fixed on the frame 1, the output end of the motor 81 is connected to the first gear 82, the first gear 82 is meshed with the second gear 83, and the second gear 83 is connected to the second hollow shaft 332; the pressure plate 4 also includes a plug-in cylinder 42 with a bottom opening, the plug-in cylinder 42 is coaxially fixed in the feed pipe 41 through a connecting rod 43, and together with the feed pipe 41 forms an annular feed area, the plug-in cylinder 42 can be slidably plugged into the top of the fixed shaft 331, and the bottom of the pressure plate 4 is spaced a certain distance from the sealing cover 34.

[0054] In the traditional mold structure, the pressure plate 4 is a fixed component of the core mold 3 or the upper mold 5. An injection port needs to be opened at the center of the bottom of the pressure plate 4, and support rods are equidistantly arranged on the bottom circumference to form a gap between the pressure plate 4 and the core mold 3 to ensure that the rubber material flows smoothly to the molding cavity 9. When the rubber material flows from the center of the pressure plate 4 to the surrounding areas, it is blocked by the support rods and cannot form a dense upper cover. Therefore, during inflation and demolding, a greater airflow intensity is required to ensure smooth demolding.

[0055] In the above technical solution, the pressure plate 4 is plugged and fixed to the fixed shaft 331 through the plug-in tube 42, and the fixed shaft 331 forms a gap between the pressure plate 4 and the sealing cover 34. There is no obstruction when the rubber material flows from the annular feeding area formed by the feed pipe 41 and the plug-in tube 42 to the molding cavity 9, so that a uniform and dense upper cover can be formed, thereby reducing the airflow intensity during demoulding and saving energy consumption. Example 3

[0056] Combined with Figure 1-10 This embodiment provides a tire curing bladder production device. On the basis of Embodiment 2, the structure of the core mold 3 is further optimized, and a cutter mechanism 36 is provided to directly cut off the upper cover of the tire curing bladder after demoulding. The specific technical solution is as follows:

[0057] The sealing cover 34 is fixed on the fixed shaft 331, and the side wall and the circular opening 311 form an annular space. A cutter mechanism 36 is provided at the bottom, and the cutter mechanism 36 includes a first rotating ring 361 connected to the second hollow shaft 332. The outer wall of the first rotating ring 361 can rotatably cover the second rotating ring 362. The outer wall of the second rotating ring 362 is threadedly connected to the annular cutter 363. The annular cutter 363 seals the annular space and can slide vertically in the annular space. The first rotating ring 361 is provided with a plug rod 364 that can be radially extended under control, and the inner wall of the second rotating ring 362 is provided with a plug groove 3621 corresponding to the plug rod 364.

[0058] In the above technical solution, vertical guide sliding means that it can only slide in the vertical direction without circumferential rotation. In the prior art, a guide sliding structure such as a guide rod and a guide groove is usually used to achieve the above function. In this embodiment, a guide sliding structure can be set between the circular opening 311 and the annular cutter 363, or between the annular cutter 363 and the sealing cover 34. The plug rod 364 can directly use an electromagnetic telescopic rod that can be extended under control in the prior art. In order to more quickly determine the alignment state of the plug slot 3621 and the plug rod 364, a displacement sensor or a camera or other displacement capture device can be set in the plug slot 3621.

[0059] During injection molding, the first rotating ring 361 rotates with the second hollow shaft 332, and the annular cutter 363 and the second rotating ring 362 are located at the initial position;

[0060] After demoulding is completed, the control connecting rod 364 is inserted into the connecting groove 3621 of the second swivel 362 to lock the first swivel 361 and the second swivel 362 circumferentially, and the second hollow shaft 332, the first swivel 361 and the second swivel 362 are driven to rotate by the rotary drive mechanism 8, and the annular cutter 363 threadedly connected to the second swivel 362 moves up to cut off the upper cover of the tire vulcanization bladder, and then the second hollow shaft 332, the first swivel 361 and the second swivel 362 are driven to rotate in the opposite direction by the rotary drive mechanism 8, and the annular cutter 363 moves down and resets, and the rotary drive mechanism 8 is closed, and the control connecting rod 364 is reset and pulled out of the connecting groove 3621, and the first swivel 361 and the second swivel 362 are released from the circumferential lock, and then the lifting mechanism 2 controls the pressure plate 4 to move up to take out the finished tire vulcanization bladder and the cut upper cover.

[0061] In a specific technical solution, an annular groove 3611 is provided on the top of the first rotating ring 361, and the annular groove 3611 is sealed and connected to the demolding air hole 341 of the sealing cover 34, a radial groove 3612 is provided on the bottom, an inner radial hole 3613 is provided on the inner wall, and an outer radial hole 3614 is provided on the outer wall. The inner wall of the first rotating ring 361 is provided with a second annular groove 3615 connected to the inner radial hole 3613, and the second annular groove 3615 is sealed and connected to the demolding air channel 3312. The plug-in rod 364 is sealed and slidably inserted in the inner radial hole 3613 and the outer radial hole 3614, and a slider 3641 matching the radial groove 3612 is provided on the bottom, and a spring 3642 is provided on the slider 3641, and the spring 3642 is fixed in the annular groove 3611.

[0062] In the above technical solution, by providing the annular groove 3611, the inner radial hole 3613, and the outer radial hole 3614 on the first rotating ring 361, and matching the plug rod 364 and the spring 3642, the air pressure during demoulding can be directly used to push the plug rod 364 into the plug groove 3621 of the second rotating ring 362, so as to achieve the circumferential locking of the first rotating ring 361 and the second rotating ring 362. It should be noted that when the first rotating ring 361 rotates, centrifugal force will be generated, and the plug rod 364 will move radially a certain distance under the action of the centrifugal force. Therefore, when the plug rod 364 is plugged into the inner radial hole 3613 and the outer radial hole 3614 at the same time, a distance for the plug rod 364 to slide centrifugally needs to be reserved.

[0063] In the initial state, the plug-in rod 364 is sealed and plugged into the inner radial hole 3613 and the outer radial hole 3614 at the same time. During the inflating and demoulding, the gas source introduces pressurized gas into the demoulding airway 3312, and the pressurized gas enters the inner radial hole 3613 through the second annular groove 3615, and applies radial pressure to the plug-in rod 364 in the inner radial hole 3613. At this time, the rotation drive mechanism 8 is started to control the second hollow shaft 332 and the first rotating ring 361 to rotate slowly. When the outer radial hole 3614 of the first rotating ring 361 is aligned with the plug-in groove 3621 of the second rotating ring 362, the plug-in rod 364 leaves the inner radial hole 3613 under the push of the gas pressure and is inserted into the plug-in groove 3621. The spring 3642 on the tire is compressed and accumulates elastic force. At this time, the rotary drive mechanism 8 is closed, and the pressurized gas enters the annular groove 3611 and the demolding hole 341 from the inner radial hole 3613, and finally enters the molding cavity 9 from the one-way valve 35 for inflation and demolding. After the demolding is completed, the rotary drive mechanism 8 is started to drive the second hollow shaft 332, the first swivel 361 and the second swivel 362 to rotate, and the annular cutter 363 threadedly connected to the second swivel 362 moves up to cut off the upper cover of the tire vulcanization bladder. Then, the second hollow shaft 332, the first swivel 361 and the second swivel 362 are driven by the rotary drive mechanism 8 to rotate in the opposite direction, and the annular cutter 363 moves down and resets, and the rotary drive mechanism 8 is closed, and the air source is closed at the same time. The gas pressure on the plug-in rod 364 disappears, and the spring 3642 releases the elastic force to push the plug-in rod 364 to reset, and the circumferential locking of the first swivel 361 and the second swivel 362 is released.

[0064] In a specific technical scheme, the annular cutter 363 includes an annular knife seat 3631 that seals the annular space, an annular blade 3632 is provided on the top of the annular knife seat 3631, a vertical slide groove 3633 is provided on the outer wall, and a thread matching the second rotating ring 362 is provided at the bottom of the inner wall. A vertical guide rod 312 matching the vertical slide groove 3633 is provided on the side wall of the circular opening 311, and a limiting flange 313 is provided at the bottom. The second rotating ring 362 is rotatably connected to the limiting flange 313, and the annular blade 3632 is aligned with the sub-mouth of the forming cavity 9. Example 4

[0065] Combined with Figure 1-10 This embodiment provides a method for using a tire curing bladder production device, comprising the following steps:

[0066] Step S100. Injection molding: the lifting mechanism 2 controls the upper mold 5, the lower mold 6, the injection cylinder 7 and the pressure plate 4 connected to the injection cylinder 7 to enter the mold closing state, preheats the upper mold 5, the lower mold 6 and the core mold 3, and simultaneously evacuates the molding cavity 9, and injects the rubber into the feed pipe 41 of the pressure plate 4 through the injection cylinder 7, and the rubber flows into the molding cavity 9 of the tire curing bladder through the feed pipe 41, and is heated to a specified time to vulcanize and mold the rubber;

[0067] Step S200. Inflation and demolding: After the vulcanization is completed, the heating is stopped, and the upper mold 5 and the lower mold 6 are controlled by the lifting mechanism 2 to open and move away from the core mold 3. At this time, the injection cylinder 7 and the pressure plate 4 are stationary, and the pressure plate 4 presses the upper cover formed by the rubber material, and inflates the demolding air channel 3312. The gas enters the molding cavity 9, and the molded tire vulcanization bladder expands until it is separated from the core mold 3. After the tire vulcanization bladder is demolded, the injection cylinder 7 and the pressure plate 4 connected to the injection cylinder 7 are controlled by the lifting mechanism 2 to move upward to take out the tire vulcanization bladder.

[0068] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention shall be equivalent replacement modes and shall be included in the protection scope of the present invention.

Claims

1. A tire curing bladder production device, comprising a frame (1), characterized in that: The frame (1) is provided with a lifting mechanism (2) and a core mold (3), the lifting mechanism (2) being connected to an upper mold (5), a lower mold (6) and an injection cylinder (7), a pressure plate (4) being provided between the core mold (3) and the upper mold (5), the core mold (3), the pressure plate (4), the upper mold (5) and the lower mold (6) being able to close to form a molding cavity (9), a feed pipe (41) being provided at the center of the pressure plate (4) and being connected to the molding cavity (9), the feed pipe (41) being able to slide through the upper mold (5) in a sealed manner and then being connected to the injection cylinder (7), and a demoulding airway (3312) being connected to the molding cavity (9) and an external air source being provided in the core mold (3); The core mold (3) comprises a core barrel (31), the core barrel (31) having a circular opening (311) at the top, a first hollow shaft (32) fixedly connected at the bottom, and a central shaft (33) disposed inside. The central shaft (33) comprises a fixed shaft (331), the fixed shaft (331) being sealably and rotatably sleeved with a second hollow shaft (332), a plurality of rotating blades (333) being equidistantly arranged on the circumference of the second hollow shaft (332), the bottom seal being rotatably passed through the first hollow shaft (32) and connected to a rotating drive mechanism (8), a heat medium inflow channel (3311) and the demoulding air channel (3312) being arranged in the fixed shaft (331), a first annular groove (3321) being communicated with the heat medium inflow channel (3311) being arranged on the inner side wall of the second hollow shaft (332), a heat medium inflow hole (3331) being communicated with the first annular groove (3321) being arranged above the side wall of the rotating blade (333), and a heat medium outflow channel (321) being communicated with the core barrel (31) being arranged on the first hollow shaft (32).

2. The tire curing bladder production device according to claim 1, characterized in that: The lifting mechanism (2) comprises two upper die cylinders (21), a lifting plate (22) and two lower die cylinders (23); the piston rod of the upper die cylinder (21) can slide through the lifting plate (22) and then be connected to the upper die (5); the piston rod of the lower die cylinder (23) is connected to the lower die (6); the upper end surface of the lifting plate (22) is fixedly connected to the injection cylinder (7); the injection head of the injection cylinder (7) passes through the lifting plate (22) and then is connected to the feed pipe (41).

3. The tire curing bladder production device according to claim 2, characterized in that: The frame (1) comprises four upright columns (11) arranged in a rectangular shape, and an upper table (12) and a lower table (13) arranged at intervals on the upright columns (11); a damping sleeve (111) is provided on the upright column (11); a sliding hole (221) cooperating with the upright column (11) is provided on the lifting plate (22); in a mold closing state, the sliding hole (221) and the damping sleeve (111) are damping-cooperated; the upper mold cylinder (21) is fixedly provided on the upper table (12); an upper through hole (121) for the injection cylinder (7) to pass through is provided at the center; and the core mold (3) and the lower mold cylinder (23) are fixedly provided on the lower table (13).

4. The tire curing bladder production device according to claim 3, characterized in that: A sealing cover (34) is provided at the circular opening (311), a demoulding air hole (341) is axially provided on the sealing cover (34), a one-way valve (35) is provided in the demoulding air hole (341), the first hollow shaft (32) can slide through the lower mold (6) and then be fixed on the frame (1), a vacuum air passage (322) connected to the molding cavity (9) is provided inside the first hollow shaft (32), the central shaft (33) is sealed and extends out of the first hollow shaft (32) and then is fixed on the frame (1), a demoulding air passage (3312) connected to the demoulding air hole (341) is provided in the central shaft (33).

5. The tire curing bladder production device according to claim 4, characterized in that: The rotary drive mechanism (8) comprises a motor (81) fixedly mounted on the frame (1), the output end of the motor (81) being connected to a first gear (82), the first gear (82) being meshed with a second gear (83), and the second gear (83) being connected to the second hollow shaft (332); the pressure plate (4) further comprises a plug-in cylinder (42) with an opening at the bottom, the plug-in cylinder (42) being coaxially fixed in the feed pipe (41) via a connecting rod (43), and forming an annular feed area together with the feed pipe (41), the plug-in cylinder (42) being capable of being slidably plugged into the top of the fixed shaft (331), and the bottom of the pressure plate (4) being spaced a certain distance from the sealing cover (34).

6. The tire curing bladder production device according to claim 5, characterized in that: The sealing cover (34) is fixed on the fixed shaft (331), and the side wall and the circular opening (311) form an annular space. A cutter mechanism (36) is provided at the bottom. The cutter mechanism (36) comprises a first rotating ring (361) connected to the second hollow shaft (332). The outer wall of the first rotating ring (361) can rotatably cover a second rotating ring (362). The outer wall of the second rotating ring (362) is threadedly connected to an annular cutter (363). The annular cutter (363) seals the annular space and can slide vertically in the annular space. The first rotating ring (361) is provided with a plug rod (364) that can be radially extended under control, and the inner wall of the second rotating ring (362) is provided with a plug groove (3621) corresponding to the plug rod (364).

7. The tire curing bladder production device according to claim 6, characterized in that: The first rotating ring (361) is provided with an annular groove (3611) at the top, and the annular groove (3611) is sealed and connected to the demoulding air hole (341) of the sealing cover (34). The bottom is provided with a radial groove (3612). The inner wall is provided with an inner radial hole (3613), and the outer wall is provided with an outer radial hole (3614). The inner wall of the first rotating ring (361) is provided with a second annular groove (3615) connected to the inner radial hole (3613), and the second annular groove (3615) is sealed and connected to the demoulding air passage (3312). The plug rod (364) is sealed and slidably plugged into the inner radial hole (3613) and the outer radial hole (3614). The bottom is provided with a slider (3641) matched with the radial groove (3612), and the slider (3641) is provided with a spring (3642), and the spring (3642) is fixed in the annular groove (3611).

8. The tire curing bladder production device according to claim 7, characterized in that: The annular cutter (363) comprises an annular knife seat (3631) for sealing an annular space, an annular blade (3632) is provided on the top of the annular knife seat (3631), a vertical slide groove (3633) is provided on the outer wall, a thread matching the second rotating ring (362) is provided at the bottom of the inner wall, a vertical guide rod (312) matching the vertical slide groove (3633) is provided on the side wall of the circular opening (311), a limiting flange (313) is provided at the bottom, the second rotating ring (362) is rotatably connected to the limiting flange (313), and the annular blade (3632) is aligned with the sub-opening of the forming cavity (9).

9. The method for using a tire curing bladder production device according to claim 8, characterized in that: The following steps are involved: Step S100. Injection molding: The lifting mechanism (2) controls the upper mold (5), the lower mold (6), the injection cylinder (7) and the pressure plate (4) connected to the injection cylinder (7) to enter a mold closing state, preheats the upper mold (5), the lower mold (6) and the core mold (3), and simultaneously evacuates the molding cavity (9), injects rubber into the feed pipe (41) of the pressure plate (4) through the injection cylinder (7), and the rubber flows into the molding cavity (9) of the tire vulcanization bladder through the feed pipe (41), is heated to a specified time, and vulcanizes the rubber into the molding cavity (9); Step S200. Inflation and demoulding: After the vulcanization is completed, the heating is stopped, and the upper mold (5) and the lower mold (6) are controlled by the lifting mechanism (2) to open the mold and move away from the core mold (3). At this time, the injection cylinder (7) and the pressure plate (4) are stationary, and the pressure plate (4) presses the upper cover formed by the rubber material, and inflates the demoulding air channel (3312). The gas enters the molding cavity (9), and the molded tire vulcanization bladder expands until it is separated from the core mold (3). After the tire vulcanization bladder is demoulded, the injection cylinder (7) and the pressure plate (4) connected to the injection cylinder (7) are controlled by the lifting mechanism (2) to move upward, and the tire vulcanization bladder is taken out.

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