A tire mold

Abstract

This utility model discloses a tire mold, belonging to the field of tire mold technology, including a lower mold assembly, an upper mold assembly, a tread block, and an auxiliary mold opening device. The tread block body can move radially and can also be flipped outward. In the upper mold assembly, a groove is formed on the lower outer wall of the guide ring, and the radial outer edge of the groove wall extends downward at an angle. The connecting arm of the auxiliary mold opening device is located radially outside the tread block body, with its radial extension end fixedly connected to the tread block body and its axial extension end located radially outside the tread block body and having a fitting clearance. A convex shank is rotatably mounted on the axial extension end of the connecting arm, and the convex shank has a driven surface. A portion of the driven surface extends into the groove. When the mold is opened, the convex shank is locked, and the lower groove wall slides with the driven surface, converting the axial movement of the guide ring into the radial movement and flipping of the tread block body. When the mold is closed, the guide ring presses down on the driven surface, causing the convex shank to rotate and avoid the guide ring. This avoids the problem of tire damage or deformation caused by mold opening.

Description

Technical Field

[0001] This utility model relates to the field of tire mold technology, and specifically to a tire mold. Background Technology

[0002] Currently, vulcanizing equipment such as vulcanizing tanks or vulcanizing machines without flexible mold operating devices are usually only suitable for molds with a two-part mold structure, that is, consisting of an upper mold assembly and a lower mold assembly, with a vulcanizing cavity formed inside the upper mold assembly and the lower mold assembly. Since the mold opening method is limited to the axial movement of the upper mold assembly, it can only vulcanize some simple patterns.

[0003] To overcome this technical problem, a three-part mold structure has been developed for vulcanizing tires with complex tread patterns. The lower mold assembly works in conjunction with movable blocks (tread blocks) to form the desired tread pattern on the cavity surface of the vulcanizing chamber. When vulcanizing tires with deeper tread patterns or those with steel strips on the tread, the force of the tire's upward movement is needed to open the tread blocks. This mold opening method may cause damage or deformation to the tire. Summary of the Invention

[0004] To address the problems existing in the prior art, this utility model provides a tire mold with an auxiliary mold opening device that assists in opening the tire mold and actively drives the tread blocks to open, thus avoiding tire damage or deformation.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a tire mold, including a lower mold assembly, an upper mold assembly, and a tread block. The lower mold assembly includes a lower template, and the upper mold assembly includes a guide ring. The axial movement of the guide ring realizes mold opening and closing. After mold closing, the guide ring surrounds the outside of the tread block body. The lower template is provided with a guide connecting seat, and the guide connecting seat is provided with a radially extending adjustment hole. The patterned block includes a patterned block body and a connecting plate that are fixedly connected. The connecting plate is located on the radially outer side of the patterned block body and is connected to the adjustment hole through a guide shaft. The patterned block body can move radially along the adjustment hole and can also be flipped outward relative to the lower template. A groove is provided on the lower outer wall of the guide ring, the lower groove wall is an inclined surface, and the radial outer edge of the lower groove wall extends downward at an angle. It also includes an auxiliary mold-opening device, which comprises a connecting arm, a reset elastic element, a stop block, a shank, and a rotating shaft. The connecting arm is located radially outside the patterned block body, with a radial extension end and an axial extension end at its two ends along its length. The radial extension end is fixedly connected to the patterned block body, and the axial extension end is located radially outside the patterned block body and has a fitting clearance with the outer circumferential surface of the patterned block body. The shank is rotatably mounted on the axial extension end of the connecting arm via the rotating shaft, and the end of the shank near the patterned block body has a driven surface facing the patterned block body. After mold closing, a portion of the driven surface extends into the groove. During the mold opening process, the rotation of the protruding shank is locked by the stop block, and the lower groove wall slides with the driven surface, converting the axial movement of the guide ring into the radial movement and flipping of the patterned block body; during the mold closing process, the guide ring presses down on the driven surface, causing the protruding shank to rotate and avoid the guide ring, and after the driven surface enters the groove, the reset elastic element drives the protruding shank to reset.

[0006] In the aforementioned tire mold, the driven surface is a convex arc surface, and the axial direction of the driven surface is parallel to the axial direction of the rotating shaft.

[0007] In the aforementioned tire mold, the driven surface includes an upper guide surface, a transition surface, and a lower guide surface that are connected sequentially from top to bottom. The upper guide surface and the lower guide surface are both inclined planes, and they are distributed in a figure-eight shape. The relatively adjacent ends of the upper guide surface and the lower guide surface are close to the tread block body and are smoothly connected through the transition surface.

[0008] In the aforementioned tire mold, two connecting arms are fixedly connected to the same tread block body, and the two connecting arms are arranged side by side and spaced apart.

[0009] In one of the tire molds described above, the convex shank is located between the two connecting arms.

[0010] In the aforementioned tire mold, the shank is provided with a rotating connection hole for connecting the rotating shaft; in the length direction of the shank, a limiting part and a driven part are respectively located on both sides of the rotating connection hole; the driven part is close to the tread block body, and the driven surface is located on the driven part.

[0011] In one of the tire molds described above, the stop block is fixed on the connecting arm and located below the limiting part; the reset elastic element applies an upward elastic force to the driven part.

[0012] In one of the tire molds described above, the reset elastic element is a spring or a torsion spring.

[0013] In one of the tire molds described above, the lower groove wall is provided with a wear-resistant coating or a wear-resistant plate.

[0014] In one of the tire molds described above, the connecting arm is L-shaped.

[0015] The beneficial effects of this utility model are as follows: The auxiliary mold opening device is suitable for existing three-part tire molds. When the upper mold assembly of the tire mold moves upward, the guide ring actively drives the tread block body to move radially outward and flip to open the mold, solving the problem that the existing three-part molds rely on the force of the tire rising to open the mold, which causes damage or deformation to the tire.

[0016] This auxiliary mold-opening device hardly changes the original structure of the tire mold or the operator's operating habits, which is conducive to its promotion and application; it has a simple structure and low production, manufacturing and use costs.

[0017] The tire mold has a short opening stroke, saving mold opening time.

[0018] The auxiliary mold opening device offers a variety of feasible solutions for reset elastic elements and stops, which can be applied to different usage environments. Attached Figure Description

[0019] Figure 1 A schematic diagram of the overall structure of the tire mold when a spring is used as the reset elastic element; Figure 2 for Figure 1 Enlarged view of region A in the middle; Figure 3 A schematic diagram of the structure of the first embodiment of the convex shank; Figure 4 A schematic diagram of the structure of the second embodiment of the convex shank; Figure 5 A schematic diagram of the tire mold structure when a torsion spring is used as the reset elastic element; Figure 6 This is a schematic diagram illustrating the state changes of the tire mold during the mold opening process; Figure 7 This is a schematic diagram showing the state changes of the tire mold during the mold closing process.

[0020] In the picture: 100 - Lower mold assembly; 110 - Lower template; 120 - Guide connector; 121 - Adjustment hole; 200 - Upper mold assembly; 210 - Guide ring; 220 - Groove; 230 - Lower groove wall; 300 - Patterned block; 310 - Patterned block body; 320 - Connecting plate; 330 - Guide shaft; 400 - Auxiliary mold opening device; 410 - Connecting arm; 420 - Reset elastic element; 430 - Stop block; 440 - Protruding shank; 441 - Driven surface; 450 - Rotating shaft. Detailed Implementation

[0021] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0022] Please refer to Figure 1 and Figure 2 The tire mold includes a lower mold assembly 100, an upper mold assembly 200, and a tread block 300. The tread block 300 includes a tread block body 310, a connecting plate 320, and a guide shaft 330. The connecting plate 320 is located radially outside the tread block body 310 and is fixedly connected to it, allowing for synchronous radial movement and rotation. The guide shaft 330 is connected to the connecting plate 320, which can be either a fixed or rotatable connection. The lower mold assembly 100 includes a lower mold plate 110. A guide connecting seat 120 is provided at a position corresponding to the connecting plate 320. The guide connecting seat 120 has a radially extending adjustment hole 121, and the guide shaft 330 is slidably disposed within the adjustment hole 121. The upper mold assembly 200 includes a guide ring 210. The guide ring 210 moves axially to realize mold opening and mold closing. After the mold is closed, the guide ring 210 surrounds the outside of the pattern block body 310. When the mold is opened, the guide shaft 330 slides radially along the adjustment hole 121 and the pattern block body 310 flips outward with the guide shaft 330 as the rotation center.

[0023] The auxiliary mold opening device 400 is set between the upper mold assembly 200 and the tread block 300. During mold opening, the axial movement of the guide ring 210 is converted into the radial movement and flipping of the tread block body 310. During the entire mold opening process, the tread block 300 moves radially outward and flips simultaneously, gradually reducing the amount of mutual embedding between the tire and the tread block until the tire and the tread block are completely separated. This avoids the problem of tire damage or deformation caused by using the force of the tire's rise to open the tread block in the prior art.

[0024] Specifically, the auxiliary mold opening device 400 includes a connecting arm 410, a reset elastic element 420, a stop block 430, a protruding shank 440, and a rotating shaft 450. The connecting arm 410 is located radially outside the patterned block body 310, is L-shaped, and has a radially extending end and an axially extending end. The radially extending end is fixedly connected to the patterned block body 310 or the connecting plate 320, and the connection method can be welding, detachable connection, etc. The axially extending end is located radially outside the patterned block body 310 and has a fitting gap with the outer peripheral surface of the patterned block body 310. After the mold is closed, the lower end of the guide ring 210 enters the fitting gap.

[0025] The shank 440 is rotatably mounted on the axial extension end of the connecting arm 410 via a pivot 450. The shank 440 rotates relative to the connecting arm 410 with the pivot 450 as its center of rotation. Exemplarily, the shank 440 is rotatably connected to the pivot 450; the pivot 450 can be rotatably mounted on the connecting arm 410 or fixed to it. Alternatively, the shank 440 and the pivot 450 are fixedly connected as a single unit, with the pivot 450 rotatably mounted on the connecting arm 410.

[0026] like Figure 3 As shown, the convex shank 440 is provided with a rotating connection hole 444. With the rotating connection hole 444 as the boundary, on both sides of the rotating connection hole 444 in the length direction of the convex shank 440, there are a limiting part 442 and a driven part 443 respectively. The driven part 443 is close to the patterned block body 310, and the limiting part 442 is far away from the patterned block body 310. The driven part 443 is provided with a driven surface 441 facing the patterned block body 310.

[0027] A groove 220 is formed on the lower outer wall of the guide ring 210, and a portion of the driven surface 441 can extend into the groove 220. The lower groove wall 230 of the groove 220 is an inclined surface, and the radial outer edge of the lower groove wall 230 extends downward at an angle. The driven surface 441 cooperates with the lower groove wall 230, and when the guide ring 210 moves axially during mold opening, it drives the patterned block body 310 to move radially outward and flip.

[0028] The driven surface 441 includes several planes or curved surfaces that are connected sequentially and smoothly transitioned, such as... Figure 3 As shown, the driven surface 441 is composed of an upper guide surface 4411, a transition surface 4412 and a lower guide surface 4413. The upper guide surface 4411 and the lower guide surface 4413 are planar and inclined, and the upper guide surface 4411 and the lower guide surface 4413 are in a figure-eight shape. The transition surface 4412 is a curved surface that smoothly connects the relatively adjacent ends of the upper guide surface 4411 and the lower guide surface 4413. At this time, the end of the convex shank 440 facing the guide ring 210 is frustum-shaped.

[0029] Or, such as Figure 4 As shown, the driven surface 441 can be an outwardly convex arc surface, and at this time, the end of the convex shank 440 facing the guide ring 210 is a frustum-shaped structure with its axis parallel to the rotating shaft 450.

[0030] The stop block 430 and the reset elastic element 420 cooperate to limit the rotation direction and rotation locking position of the shank 440. Specifically, during the mold opening process, the shank 440 is locked by the stop block 430 and does not rotate during the entire contact process between the driven surface 441 and the lower groove wall 230 or after the two have been in contact for a period of time. The lower groove wall 230 and the driven surface 441 slide to convert the axial movement of the guide ring 210 into the radial movement and flipping of the pattern block body 310. When the mold is closed, the stop block 430 does not obstruct the rotation of the shank 440. The guide ring 210 descends to contact the driven part 443 of the shank 440 and presses down on the driven part 443. The driven part 443 rotates to avoid the guide ring 210, thereby allowing the guide ring 210 to enter the fitting gap between the shank 440 and the pattern block body 310. After the driven part 443 enters the groove 220, the protruding shank 440 is reset under the action of the reset elastic element 420, that is, it returns to the state when it was not pressed down by the guide ring 210, such as the horizontal state.

[0031] For example, such as Figure 2 As shown, the stop block 430 is fixed on the connecting arm 410 and is located on the side of the rotating shaft 450 away from the pattern block body 310; the stop block 430 is located below the limiting part 442 of the convex shank 440 and blocks the rotation path of the convex shank 440; one end of the reset elastic element 420 is connected to the convex shank 440, and the other end is connected to the stop block 430 or the connecting arm 410, thereby applying an upward elastic force to the driven part 443 of the convex shank 440; when the guide ring 210 moves upward and is in the following position... When an upward force is applied to the moving surface 441, the stop block 430 prevents the limiting part 442 of the convex handle 440 from rotating downward, that is, the convex handle 440 is locked; when the guide ring 210 moves downward and applies a downward force to the driven surface 441, the driven part 443 of the convex handle 440 overcomes the elastic force of the reset elastic element 420, and the end pressed down by the guide ring 210 swings downward. At this time, the limiting part 442 of the convex handle 440 rotates upward and is not hindered by the stop block 430.

[0032] Understandably, the stop 430 can also be located above the convex shank 440. In this case, the stop 430 should ideally block the upper side of the driven part 443 of the convex shank 440. Similarly, the reset elastic element 420 can also be provided on the upper side of the convex shank 440.

[0033] The reset elastic element 420 can be as follows Figure 1 , Figure 2 As shown, a spring is used, with the two ends of the spring connected to the driven part 443 of the cam 440 and the stop block 430, respectively.

[0034] The reset elastic element 420 can also be as follows Figure 5As shown, a torsion spring is used. The torsion spring is fitted on the outside of the rotating shaft 450. One end abuts or is inserted into the protrusion 440, and the other end abuts against the connecting arm 410 or the stop block 430. An upward elastic force is always applied at the driven part 443 of the protrusion 440.

[0035] The tire mold opening process using the aforementioned auxiliary mold opening device 400 is as follows: Figure 6 As shown, after the upper mold assembly 200 travels a certain distance upward, the lower groove wall 230 of the shank 440 slides into contact with the driven surface 441. At this time, the shank 440 is locked by the stop block 430, and the driven part 443 of the shank 440 cannot rotate upward. As the guide ring 210 continues to rise, under the sliding contact between the lower groove wall 230 and the driven surface 441, the connecting arm 410 drives the pattern block body 310 to translate and flip outward, thereby realizing the mold opening of the pattern block body 310. The setting of the stop block 430 prevents the pattern block body 310 from rotating upward, ensuring the stabilizing effect of the shank 440 and the guide ring 210, and preventing the shank 440 from losing its function during mold opening.

[0036] The tire mold closing process is as follows Figure 7 As shown, as the guide ring 210 descends, the driven part 443 of the protrusion 440 contacts the guide ring 210 and is pressed down. The stop block 430 cannot restrict the downward rotation of the driven part 443, so it can be flipped to avoid the guide ring 210 and will not affect the closing of the tire mold. When the driven part 443 enters the groove 220, under the action of the reset elastic element 420, the protrusion 440 rotates back to reset, ensuring that it can be used normally in the next mold opening.

[0037] The lower groove wall 230 can be treated with wear resistance, such as by applying a wear-resistant coating or installing wear-resistant plates. Each patterned block 300 is provided with a corresponding set of auxiliary mold opening device 400; the auxiliary mold opening device 400 can have one connecting arm 410, preferably two; the two connecting arms 410 are arranged side by side and spaced apart, and are fixedly connected to the same patterned block body 310, with the convex shank 440 located between the two connecting arms 410.

[0038] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A tire mold, comprising a lower mold assembly (100), an upper mold assembly (200), and a tread block (300), wherein the lower mold assembly (100) includes a lower template (110), and the upper mold assembly (200) includes a guide ring (210), wherein the guide ring (210) moves axially to achieve mold opening and closing, and after mold closing, the guide ring (210) surrounds the outside of the tread block (300); characterized in that, The lower template (110) is provided with a guide connecting seat (120), and the guide connecting seat (120) is provided with a radially extending adjustment hole (121). The patterned block (300) includes a patterned block body (310) and a connecting plate (320) that are fixedly connected. The connecting plate (320) is located on the radial outer side of the patterned block body (310) and is connected to the adjusting hole (121) through a guide shaft (330). The patterned block body (310) can move radially along the adjusting hole (121) and flip outward relative to the lower template (110). A groove (220) is provided on the lower outer wall of the guide ring (210). The lower groove wall (230) of the groove (220) is an inclined surface, and the radial outer edge of the lower groove wall (230) extends downward at an angle. It also includes an auxiliary mold-opening device, which includes a connecting arm (410), a reset elastic element (420), a stop (430), a shank (440), and a rotating shaft (450). The connecting arm (410) is located radially outside the patterned block body (310). The two ends of the connecting arm (410) in the length direction are a radial extension end and an axial extension end, respectively. The radial extension end is fixedly connected to the patterned block body (310), and the axial extension end is located on the patterned block body (310). The radially outer side of the pattern block body (310) and the outer peripheral surface of the pattern block body (310) have a fitting gap; the shank (440) is rotatably mounted on the axial extension end of the connecting arm (410) via the pivot (450), and the end of the shank (440) near the pattern block body (310) has a driven surface (441) facing the pattern block body (310); after mold closing, a portion of the driven surface (441) extends into the groove (220); During the mold opening process, the rotation of the protruding shank (440) is locked by the stop block (430), and the lower groove wall (230) slides with the driven surface (441) to convert the axial movement of the guide ring (210) into the radial movement and flipping of the pattern block body (310). During the mold closing process, the guide ring (210) presses down on the driven surface (441) to make the protruding shank (440) rotate and avoid the guide ring (210). After the driven surface (441) enters the groove (220), the reset elastic element (420) drives the protruding shank (440) to reset.

2. The tire mold according to claim 1, characterized in that, The driven surface (441) is a convex arc surface, and the axial direction of the driven surface (441) is parallel to the axial direction of the rotating shaft (450).

3. A tire mold according to claim 1, characterized in that, The driven surface (441) includes an upper guide surface (4411), a transition surface (4412), and a lower guide surface (4413) that are connected in sequence. The upper guide surface (4411) and the lower guide surface (4413) are both inclined planes, and they are distributed in a figure-eight shape. The relatively adjacent ends of the upper guide surface (4411) and the lower guide surface (4413) are close to the pattern block body (310) and are smoothly connected through the transition surface (4412).

4. A tire mold according to claim 1, characterized in that, Two connecting arms (410) are fixedly connected to the same patterned block body (310), and the two connecting arms (410) are arranged side by side and spaced apart.

5. A tire mold according to claim 4, characterized in that, The shank (440) is located between the two connecting arms (410).

6. A tire mold according to claim 1, characterized in that, The convex shank (440) is provided with a rotating connection hole (444) for connecting the rotating shaft (450); in the length direction of the convex shank (440), the two sides of the rotating connection hole (444) are respectively a limiting part (442) and a driven part (443); the driven part (443) is close to the patterned block body (310), and the driven surface (441) is located on the driven part (443).

7. A tire mold according to claim 6, characterized in that, The stop (430) is fixed on the connecting arm (410) and located below the limiting part (442); the reset elastic element (420) applies an upward elastic force to the driven part (443).

8. A tire mold according to claim 7, characterized in that, The reset elastic element (420) is a spring or a torsion spring.

9. A tire mold according to claim 1, characterized in that, The lower groove wall (230) is provided with a wear-resistant coating or wear-resistant plate.

10. A tire mold according to claim 1, characterized in that, The connecting arm (410) is L-shaped.

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