CN221717903U - A tire mold with stable opening and closing - Google Patents

Abstract

The utility model relates to the technical field of tire molds, and specifically to a tire mold with stable mold opening and closing. The technical problem to be solved is to overcome the defects of mold opening and closing in the prior art, which is mainly achieved through the following technical scheme: a tire mold with stable mold opening and closing, comprising an upper mold body, a lower mold body, a tread ring and a mold core constituting a cavity, the tread ring comprising a plurality of equally divided active blocks, a positioning structure and a locking structure, the positioning structure comprising a plurality of push rods and a plurality of abutment members, the locking structure comprising a locking member and a film closing member, the positioning structure is provided to ensure accurate positioning between the active blocks, to ensure that the tread ring is tightly combined, and to avoid problems such as structural dislocation; the locking structure replaces the original structure for applying a film closing force to directly lock the mold, thereby reducing the energy consumption of the additional film closing force, ensuring the production quality of the finished tire product, and also reducing the deformation and loosening problems caused by long-term use, and avoiding the occurrence of thick edges and the like.

Description

A tire mold with stable opening and closing

Technical Field

The utility model relates to the technical field of tire molds, in particular to a tire mold with stable opening and closing of the mold.

Background Art

The molds used for vulcanized tires and other products include flexible molds, which usually include an upper mold part, a lower mold part and a tread ring part. The tread ring is composed of tread blocks and is a component used to change the pattern style in the tire mold. The tread blocks are installed on the inner side of the side of the tire mold and are mostly fan-shaped. During the mold opening and closing process, the tread blocks translate in the radial direction, and the vulcanized tire is demolded through the radial translation of each tread block. If some tread blocks do not translate outward, it will be difficult to demold the tire with a complex tread design.

In the prior art, since the mold with pattern rings has a relatively complex structure and a large overall weight, and all parts of the mold need to move during the mold closing and opening process, there are problems such as the inability to accurately position the pattern blocks, the inability to correctly join the adjacent parts, and the easy occurrence of structural misalignment, which leads to the inaccurate centering of the tire embryo, resulting in serious unevenness or misaligned rubber edges in the subsequent vulcanized tire; in addition, when the mold is opened, the pattern blocks cannot be aligned, resulting in the inability to properly demold, directly damaging the finished product and causing mold damage. At the same time, since the internal bladder needs to be pressurized during tire vulcanization, in order to ensure reliable mold closing, the tire vulcanizer needs to provide a clamping force (150-300t) to the mold, and the clamping force cannot be revoked during the vulcanization process. The mold with misaligned mold closing is more easily damaged under the extrusion of the clamping force, and the energy consumption of increasing the clamping force externally during the vulcanization process is large, and the equipment cost is high.

Utility Model Content

Therefore, the technical problem to be solved by the utility model is to overcome the defects of mold opening and closing in the prior art, thereby providing a tire mold with stable mold opening and closing.

The above technical objectives of the utility model are achieved through the following technical solutions:

A tire mold with stable opening and closing, comprising an upper mold body, a lower mold body, a tread ring and a mold core, wherein a cavity is formed between the upper mold body, the lower mold body, the tread ring and the mold core, the tread ring is arranged between the upper mold body and the lower mold body, the upper mold body and the lower mold body are both annular with a hole in the center, the mold core is coaxially arranged with the upper mold body, the lower mold body and the tread ring, an outer plate is further extended from the upper mold body, and further comprises:

A pattern ring, wherein the bottom diameter of the pattern ring is larger than the top diameter, the pattern ring comprises a plurality of equally divided active blocks, the active blocks are radially closed to form an annular pattern ring, the active blocks are fan-shaped and arranged in an array along the circumference of the mold core;

A positioning structure, wherein the positioning structure is arranged on the lower mold body, the positioning structure comprises a plurality of ejector rods and a plurality of abutment members, the ejector rods are vertically slidably arranged in the lower mold body, the abutment members are positioned and rotatably installed in the lower mold body, the ejector rods comprise an ejector rod shaft and an ejector rod groove, the ejector rod shaft is slidably arranged in the ejector rod groove, the abutment member comprises an abutment rod, a central axis and a rotation groove, the rotation groove is provided on the lower mold body, and the abutment rod and the central axis are both installed in the rotation groove;

A locking structure, wherein the locking structure includes a locking piece and a mold closing piece, the locking piece includes a locking block and a locking groove, the locking blocks are provided with multiple corresponding movable blocks and are fixed on the inner wall of the outer plate, the locking groove is arranged on the side of the movable block close to the outer plate, the locking block is slidably arranged in the locking groove, the mold closing piece includes an outer sleeve plate and a tightening block, the tightening block is fixedly arranged at the bottom of the outer sleeve plate, and the outer sleeve plate is also clamped in the outer sleeve plate.

By adopting the above technical scheme, the vulcanized tire is formed in the cavity formed by the upper mold body, the lower mold body, the tread ring and the mold core, thereby achieving the purpose of the tire mold to produce tire products; a positioning structure is set to ensure the accurate positioning of each active block, ensure the tight combination of the tread ring, and avoid problems such as structural dislocation; the locking structure replaces the original clamping force application structure to directly lock the mold, thereby reducing the energy consumption of the additional clamping force, ensuring the production quality of the finished tire, and can also reduce the deformation and looseness problems caused by long-term use, and avoid the occurrence of thick edges and the like.

Furthermore, the outer plate is in a circular shape and is arranged perpendicular to the lower bottom surface of the upper mold body. A plurality of through holes are arranged in a circular array on the side wall of the outer plate, and the through holes correspond to the middle of the joint between two adjacent active blocks after closing; the upper mold body is positioned and connected to the pattern ring, a positioning ring is extended from the bottom of the upper mold body, and a positioning groove is provided on the active block corresponding to the positioning ring; the lower mold body is positioned and connected to the pattern ring, a positioning step is extended from the top of the lower mold body, and a positioning groove is provided on the active block corresponding to the positioning step.

By adopting the above technical solution, the outer plate moves with the upper mold body, and the active blocks are aggregated after they are closed to ensure that adjacent active blocks fit closely, and the through holes are aligned with the joints of the two active blocks, so that the fit between the two active blocks can be observed in time; the positioning blocks and positioning grooves, positioning steps and positioning grooves ensure the positioning and assembly between the upper mold body and the pattern ring, and the lower mold body and the pattern ring, to ensure the overall positioning between the molds.

Furthermore, a glue overflow groove is provided in the middle of the upper top surface and the lower bottom surface of the active block, and the glue overflow groove includes a glue overflow channel and a glue overflow hole. The glue overflow channel is arranged radially along the active block and has a length of 1mm-2mm, and the glue overflow hole is hemispherical and has a diameter larger than the diameter of the glue overflow channel; a plurality of exhaust channels are also provided on the upper surface of the active block, and the exhaust channels are arranged radially along the active block and leave a gap with the inner wall of the active block.

By adopting the above technical solution, the glue overflow groove receives the excess rubber extruded in the mold, and the excess rubber enters the glue overflow hole through the glue overflow channel for storage. The glue overflow channel is as short as possible, thereby reducing the formation of fetal hair on the surface of the finished tire. The exhaust channel discharges the gas squeezed in the tire mold. The exhaust channel does not run through the active block design but leaves a certain gap, thereby preventing the rubber on the inner wall of the tire mold from leaking out of the exhaust channel, thereby avoiding the formation of fetal hair there.

Furthermore, a fitting block extends from the top of the push rod shaft, and the fitting block fits with the curvature of the bottom of the inner wall of the movable block. The push rod groove is opened on the lower mold body and a fitting groove extends from the top corresponding to the fitting block. When the fitting block is accommodated in the fitting groove, the upper end surface of the fitting block and the upper end surface of the fitting groove are located in the same horizontal plane.

By adopting the above technical solution, the bonding block rises and falls with the push rod shaft and presses against the inner wall of the movable block after the movable block is closed, so that the movable block can reach the specified position after closing, avoiding structural interference between the movable blocks; a bonding groove is provided on the top of the push rod groove to receive the bonding block, ensuring a tight fit there and avoiding leakage of rubber there.

Furthermore, the abutment rod is L-shaped with one end facing the upper surface of the lower mold body and the other end facing the inclined surface of the positioning step. The central axis is fixedly installed in the rotating groove along the width direction of the rotating groove, and the abutment rod rotates relative to the central axis.

Furthermore, each movable block is correspondingly provided with two abutment members, and the two abutment members are arranged relatively to each other with respect to the overflow glue groove, and an abutment groove is also extended from one end of the abutment rod corresponding to the positioning groove.

By adopting the above technical solution, when the active block is closed, it first contacts the upper part of the abutment rod and squeezes and rotates the abutment rod. After the active block abuts against the bonding block, the closing is completed. At this time, the other end of the abutment rod is tilted and stuck in the abutment groove. If the active block is deflected or not completely bonded, the other end of the abutment rod cannot be correctly stuck in the abutment groove, and the active block will be obviously tilted, which can prompt the personnel to adjust, thereby avoiding structural dislocation after subsequent mold closing.

Furthermore, the locking groove includes an entrance port, a rotation groove and a descending groove, the entrance port is arranged above the outer wall of the active block, the top width of the entrance port is greater than the bottom width of the entrance port, the rotation groove is arranged along the curvature of the outer wall of the outer plate, the height of the rotation groove is equal to the height of the locking block, and the descending groove is arranged below the side of the rotation groove away from the entrance port.

By adopting the above technical solution, the locking block moves with the outer plate, first descends into the entrance, then rotates to the bottom along the rotating groove, and then descends along the descending groove, so that the locking block is stuck in the descending groove, avoiding the movement of the active block in the outer plate and ensuring that the active block is closed.

Furthermore, a clamping block is arranged on the inner side of the outer sleeve plate corresponding to the abutting block. The clamping blocks are arranged in a circumferential array on the inner wall of the outer sleeve plate and form a circular ring with the abutting block. The outer sleeve plate is also arranged to slide vertically relative to the outer sleeve plate.

By adopting the above technical solution, the movement trajectory of the clamping block is the same as that of the locking block, and the clamping block finally falls between two adjacent clamping blocks and clamps, thereby increasing the cooperation between the clamping block and the clamping block and ensuring that the external fit is tight. Interference fit can be used between the clamping block and the clamping block to apply aggregation force to the internal active block.

In summary, the technical solution of the utility model has the following advantages:

1. The utility model provides a tire mold with stable opening and closing, and a positioning structure is provided to ensure accurate positioning between the active blocks, ensure that the pattern rings are closely combined, and avoid problems such as structural dislocation.

2. The utility model provides a tire mold with stable opening and closing. The locking structure replaces the original structure for applying clamping force to directly lock the mold, thereby reducing the energy consumption of the additional clamping force, ensuring the production quality of the finished tire product, and reducing the deformation and loosening problems caused by long-term use, avoiding the occurrence of thick edges, etc.

3. The utility model provides a tire mold with stable opening and closing, and is provided with an overflow groove to receive the excess rubber extruded in the mold. The overflow channel is as short as possible, and the exhaust channel does not run through the active block design but leaves a certain gap, which can reduce the formation of tire hair on the surface of the finished tire and ensure the quality of the finished vulcanized tire.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of the overall structure of a tire mold with stable opening and closing provided in one embodiment of the utility model;

FIG2 is a cross-sectional view of a tire mold with stable opening and closing provided in one embodiment of the utility model;

FIG3 is a schematic diagram of an explosion structure of a tire mold with stable opening and closing provided in one embodiment of the utility model;

FIG. 4 is a schematic diagram of a partial structure of an active block provided in one embodiment of the utility model.

FIG5 is a schematic cross-sectional structural diagram of an abutment member provided in one embodiment of the present utility model.

Description of reference numerals:

1. Upper mold body; 11. Positioning ring; 2. Lower mold body; 21. Positioning step; 3. Pattern ring; 31. Active block; 311. Positioning groove; 312. Positioning groove; 3121. Abutment groove; 313. Overflow groove; 3131. Overflow channel; 3132. Overflow hole; 314. Exhaust channel; 4. Mold core; 5. Cavity; 6. Outer plate; 61. Through hole; 7. Positioning structure; 71. Ejector rod; 711. Ejector shaft ;7111, fitting block;712, push rod groove;7121, fitting groove;72, abutment piece;721, abutment rod;722, center axis;723, rotation groove;8, locking structure;81, locking piece;811, locking block;812, locking groove;8121, entrance;8122, rotation groove;8123, descending groove;82, mold clamping piece;821, outer sleeve plate;8211, clamping block;822, abutment block.

DETAILED DESCRIPTION

The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

A tire mold with stable mold opening and closing, as shown in Fig. 1, Fig. 2 and Fig. 3, comprises an upper mold body 1, a lower mold body 2, a tread ring 3 and a mold core 4 constituting a mold cavity 5, wherein the tread ring 3 is arranged between the upper mold body 1 and the lower mold body 2, the bottom diameter of the tread ring 3 is larger than the top diameter, the tread ring 3 comprises a plurality of equally divided active blocks 31, the active blocks 31 are radially closed to form an annular tread ring 3, the active blocks 31 are fan-shaped and arranged in an array along the circumference of the mold core 4, the upper mold body 1 and the lower mold body 2 are both annular with a hole in the center, the mold core 4 is coaxially arranged with the upper mold body 1, the lower mold body 2 and the tread ring 3, and an outer plate 6 is also extended from the bottom of the upper mold body 1. It also comprises a positioning structure 7 and a locking structure 8. The positioning structure 7 is arranged on the lower mold body 2, and the positioning structure 7 comprises a plurality of ejector members 71 and a plurality of abutting members 72. The locking structure 8 comprises a locking member 81 and a mold closing member 82. A positioning structure 7 is provided to ensure accurate positioning of the active blocks 31, to ensure tight connection of the tread ring 3, and to avoid problems such as structural misalignment; a locking structure 8 replaces the original structure for applying a clamping force to directly lock the mold, thereby reducing energy consumption of the additional clamping force, ensuring the production quality of the finished tire product, and also reducing deformation and loosening problems caused by long-term use, and avoiding the occurrence of thick edges, etc.

As shown in Fig. 2 and Fig. 3, the outer plate 6 is annular and is arranged perpendicular to the lower bottom surface of the upper mold body 1. A plurality of through holes 61 are arranged in a circumferential array on the side wall of the outer plate 6. The through holes 61 correspond to the middle of the joint between two adjacent active blocks 31 after they are closed. The outer plate 6 moves with the upper mold body 1, and aggregates the active blocks 31 after the active blocks 31 are closed, ensuring that the adjacent active blocks 31 are closely fitted. The through holes 61 are aligned with the joint between the two active blocks 31, so that the fitting between the two active blocks 31 can be observed in time.

The upper mold body 1 is connected to the pattern ring 3 in a positioning manner. A positioning ring 11 is extended from the bottom of the upper mold body 1. A positioning groove 311 is provided on the active block 31 corresponding to the positioning ring 11. The lower mold body 2 is connected to the pattern ring 3 in a positioning manner. A positioning step 21 is extended from the top of the lower mold body 2. A positioning groove 312 is provided on the active block 31 corresponding to the positioning step 21. The positioning block and the positioning groove 311, the positioning step 21 and the positioning groove 312 ensure the positioning and assembly between the upper mold body 1 and the pattern ring 3, and the lower mold body 2 and the pattern ring 3, and ensure the overall positioning between the molds.

As shown in Fig. 2, Fig. 3 and Fig. 4, the middle of the upper top surface and the lower bottom surface of the active block 31 are provided with a glue overflow groove 313, which includes a glue overflow channel 3131 and a glue overflow hole 3132. The glue overflow channel 3131 is arranged along the radial direction of the active block 31 and has a length of 1mm-2mm. The glue overflow hole 3132 is hemispherical and has a diameter larger than the diameter of the glue overflow channel 3131. The glue overflow groove 313 receives the excess rubber extruded in the mold, and the excess rubber enters the glue overflow hole 3132 through the glue overflow channel 3131 for storage. The glue overflow channel 3131 is as short as possible, so as to reduce the formation of tire hair on the surface of the finished tire.

The upper surface of the active block 31 is also provided with a plurality of exhaust channels 314, which are arranged along the radial direction of the active block 31 and have a gap with the inner wall of the active block 31. The exhaust channels 314 discharge the gas squeezed in the tire mold, and the exhaust channels 314 do not penetrate the active block 31 but leave a certain gap, so as to prevent the rubber material on the inner wall of the tire mold from leaking out from the exhaust channels 314 and prevent the generation of tire hair there.

As shown in FIG. 2 and FIG. 3 , the ejector member 71 is vertically slidably arranged in the lower mold body 2. The ejector members 71 are arranged in a circular array on the lower mold body 2 and each flexible block 31 has two ejector members 71. The ejector member 71 includes an ejector shaft 711 and an ejector groove 712, and the ejector shaft 711 is slidably arranged in the ejector groove 712. Since the ejector shaft 711 slides in the lower mold body 2, the present application is applicable to a mold with balanced transition between the lower mold body 2 and the pattern ring 3. If the slope of the flexible block 31 is too large, the flexible block 31 cannot be fitted with the fitting block 7111. A fitting block 7111 extends from the top of the push rod shaft 711, and the fitting block 7111 fits with the curvature of the bottom of the inner wall of the flexible block 31. The push rod groove 712 is provided on the lower mold body 2 and a fitting groove 7121 extends from the top corresponding to the fitting block 7111. When the fitting block 7111 is accommodated in the fitting groove 7121, the upper end surface of the fitting block 7111 and the upper end surface of the fitting groove 7121 are located in the same horizontal plane. The fitting block 7111 rises and falls with the push rod shaft 711 and presses against the inner wall of the flexible block 31 after the flexible block 31 is closed, so that the flexible block 31 can reach the specified position after closing, avoiding structural interference between the flexible blocks 31; the fitting groove 7121 is provided on the top of the push rod groove 712 to receive the fitting block 7111, ensuring a tight fit there, and avoiding leakage of the rubber material there.

As shown in Fig. 3 and Fig. 5, the abutment member 72 is positioned and rotatably installed in the lower mold body 2. The abutment member 72 includes an abutment rod 721, a central axis 722 and a rotation groove 723. The rotation groove 723 is provided on the lower mold body 2, and the abutment rod 721 and the central axis 722 are both installed in the rotation groove 723. The abutment rod 721 is L-shaped, with one end facing the upper surface of the lower mold body 2 and the other end facing the inclined surface of the positioning step 21. The central axis 722 is fixedly installed in the rotation groove 723 along the width direction of the rotation groove 723, and the abutment rod 721 rotates relative to the central axis 722. Each movable block 31 is correspondingly provided with two abutment members 72, and the two abutment members 72 are arranged relative to each other with respect to the overflowing glue groove 313. The positioning groove 312 also extends an abutment groove 3121 at one end of the abutment rod 721 corresponding to the positioning groove 312. When the movable block 31 is closed, it first contacts the upper part of the abutment rod 721 and squeezes and rotates the abutment rod 721. The closing is completed after the movable block 31 abuts against the bonding block 7111. At this time, the other end of the abutment rod 721 is tilted and stuck in the abutment groove 3121. If the movable block 31 is deflected or not completely bonded, the other end of the abutment rod 721 cannot be correctly stuck in the abutment groove 3121. The movable block 31 will be obviously tilted, which can prompt the personnel to adjust, thereby avoiding structural dislocation after subsequent mold closing.

As shown in Fig. 3, Fig. 4 and Fig. 5, the locking member 81 includes a locking block 811 and a locking groove 812. The locking block 811 is provided with a plurality of locking blocks 811 corresponding to the active block 31 and fixed on the inner wall of the outer plate 6. The locking groove 812 is provided on the side of the active block 31 close to the outer plate 6, and the locking block 811 is slidably provided in the locking groove 812. The locking groove 812 includes an entry port 8121, a rotation groove 8122 and a descending groove 8123. The entry port 8121 is provided above the outer wall of the active block 31. The top width of the entry port 8121 is greater than the bottom width of the entry port 8121. The rotation groove 8122 is provided along the curvature of the outer wall of the outer plate 6. The height of the rotation groove 8122 is equal to the height of the locking block 811. The descending groove 8123 is provided below the side of the rotation groove 8122 away from the entry port 8121. The locking block 811 moves with the outer plate 6, first descends into the entrance 8121, then rotates to the bottom along the rotating groove 8122, and then descends along the descending groove 8123, so that the locking block 811 is stuck in the descending groove 8123, avoiding the movement of the active block 31 in the outer plate 6 and ensuring that the active block 31 is closed.

As shown in Fig. 3, Fig. 4 and Fig. 5, the mold clamping part 82 includes an outer plate 821 and a clamping block 822. The clamping block 822 is fixedly arranged at the bottom of the outer plate 6, and the outer plate 6 is also clamped in the outer plate 821. A clamping block 8211 is arranged on the inner side of the outer plate 821 corresponding to the clamping block 822. The clamping block 8211 is arranged in a circumferential array on the inner wall of the outer plate 821 and forms a circular ring with the clamping block 822. The outer plate 821 is also vertically slidable relative to the outer plate 6. The movement trajectory of the clamping block 822 is the same as that of the locking block 811, and the clamping block 822 finally falls between two adjacent clamping blocks 8211 to clamp, thereby increasing the cooperation between the clamping block 822 and the clamping block 8211, ensuring that the outer side fits tightly. The clamping block 8211 and the clamping block 822 can use interference fit to apply aggregation force to the internal active block 31.

The working principle and usage of this tire mold with stable opening and closing:

When the mold is closed: the abutment rod 721 and the outer sleeve plate 821 are both raised, and then the movable block 31 moves radially and gradually approaches until it is in contact with the abutment block 7111 on the ejector shaft 711, and the movable block 31 closes and stops. During the movement of the movable block 31, it first contacts the upper portion of the abutment rod 721 and squeezes and rotates the abutment rod 721, so that the other end of the abutment rod 721 is tilted and stuck in the abutment groove 3121; then the lower mold body 2 drives the outer plate 6 to descend together, and the locking block 811 is stuck in the entrance 8121, and then it rotates to the bottom along the rotating groove 8122, and then descends along the descending groove 8123, so that the locking block 811 is stuck in the descending groove 8123, and at this time, the abutment block 822 at the bottom of the outer plate 6 is also stuck between the two adjacent clamping blocks 8211, and then the ejector shaft 711 is lowered;

When opening the mold: the outer plate 6 is first raised and then rotated to unlock the locking block 811 and the tightening block 822, and then it is raised with the upper mold body 1 and separated from the tread ring 3, and then the active block 31 is gradually separated, the abutment rod 721 is reset, and finally the active block 31, the lower mold body 2 and the tire are separated to complete the demoulding.

The above description shows and describes the preferred embodiments of the utility model. As mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims (8)

1. The utility model provides a tire mould that mold opening and closing is stable, includes last die body (1), lower die body (2), decorative pattern circle (3) and mold core (4), constitute die cavity (5) between last die body (1), lower die body (2), decorative pattern circle (3) and mold core (4), decorative pattern circle (3) set up between last die body (1) and lower die body (2), go up die body (1) and lower die body (2) and all be the annular that the center was foraminiferous, mold core (4) and last die body (1), lower die body (2) and decorative pattern circle (3) coaxial setting, it has outer panel (6) still to extend outside last die body (1), its characterized in that still includes:

The pattern ring (3), the diameter of the bottom of the pattern ring (3) is larger than the diameter of the top, the pattern ring (3) comprises a plurality of equally divided movable blocks (31), the movable blocks (31) are folded along the radial direction to form an annular pattern ring (3), and the movable blocks (31) are fan-shaped and are arranged along the circumferential array of the mold core (4);

The positioning structure (7), the positioning structure (7) is arranged on the lower die body (2), the positioning structure (7) comprises a plurality of ejector rods (71) and a plurality of abutting pieces (72), the ejector rods (71) are vertically and slidingly arranged in the lower die body (2), the abutting pieces (72) are rotatably arranged in the lower die body (2) in a positioning mode, the ejector rods (71) comprise ejector rod shafts (711) and ejector rod grooves (712), the ejector rod shafts (711) are slidingly arranged in the ejector rod grooves (712), the abutting pieces (72) comprise abutting rods (721), a central shaft (722) and rotating grooves (723), the rotating grooves (723) are formed in the lower die body (2), and the abutting rods (721) and the central shaft (722) are arranged in the rotating grooves (723);

locking structure (8), locking structure (8) include locking piece (81) and compound die spare (82), locking piece (81) include locking piece (811) and locking groove (812), locking piece (811) correspond loose piece (31) and are provided with a plurality of and fix on outer panel (6) inner wall, locking groove (812) are offered in loose piece (31) and are close to outer panel (6) one side, locking piece (811) slide and set up in locking groove (812), compound die spare (82) include outer sleeve plate (821) and support tight piece (822), support tight piece (822) fixed the setting in outer panel (6) bottom, outer panel (6) still joint setting is in outer sleeve plate (821).

2. The tyre mould with stable open and close mould according to claim 1, characterized in that the outer side plate (6) is circular and is arranged perpendicular to the lower bottom surface of the upper mould body (1), a plurality of through holes (61) are arranged on the side wall of the outer side plate (6) in a circumferential array, and the through holes (61) correspond to the middle part of the joint of two adjacent movable blocks (31) after being folded; the upper die body (1) is in positioning connection with the pattern ring (3), a positioning ring (11) extends from the bottom of the upper die body (1), and a positioning groove (311) is formed in the movable block (31) corresponding to the positioning ring (11); the lower die body (2) is connected with the pattern ring (3) in a positioning way, a positioning step (21) is extended from the top of the lower die body (2), and a positioning groove (312) is formed in the movable block (31) corresponding to the positioning step (21).

3. The tyre mould with stable open-close mould according to claim 2, characterized in that the middle parts of the upper top surface and the lower bottom surface of the movable block (31) are provided with glue overflow grooves (313), the glue overflow grooves (313) comprise glue overflow channels (3131) and glue overflow holes (3132), the glue overflow channels (3131) are radially arranged along the movable block (31) and have the length of 1mm-2mm, and the glue overflow holes (3132) are hemispherical and have the diameter larger than the diameter of the glue overflow channels (3131); the upper surface of the movable block (31) is also provided with a plurality of exhaust channels (314), and the exhaust channels (314) are radially arranged along the movable block (31) and are spaced from the inner side wall of the movable block (31).

4. The tire mold with stable opening and closing mold according to claim 1, wherein the top of the ejector rod shaft (711) is extended with a fitting block (7111), the fitting block (7111) is fitted with the radian of the bottom of the inner wall of the movable block (31), the ejector rod groove (712) is formed on the lower mold body (2) and the top of the ejector rod groove corresponds to the fitting block (7111) and extends with a fitting groove (7121), and when the fitting block (7111) is accommodated in the fitting groove (7121), the upper end face of the fitting block (7111) and the upper end face of the fitting groove (7121) are located in the same horizontal plane.

5. A tyre mould with stable open and close mould according to claim 3, characterized in that the said abutting rod (721) is L-shaped and one end faces the upper surface of the lower mould body (2) and the other end faces the inclined surface of the positioning step (21), the said central shaft (722) is fixedly installed in the rotating groove (723) along the width direction of the rotating groove (723), the said abutting rod (721) rotates relative to the central shaft (722).

6. A tyre mould with stable open-close mould according to claim 5, characterized in that each movable block (31) is correspondingly provided with two abutting pieces (72), the two abutting pieces (72) are oppositely arranged about the glue overflow groove (313), and the positioning groove (312) is correspondingly provided with an abutting groove (3121) extending from one end of the abutting rod (721).

7. The mold for a tire with stable mold opening and closing according to claim 1, wherein the locking groove (812) comprises an inlet opening (8121), a rotary groove (8122) and a descending groove (8123), the inlet opening (8121) is arranged on the outer side wall of the movable block (31), the top width of the inlet opening (8121) is larger than the bottom width of the inlet opening (8121), the rotary groove (8122) is arranged along the radian of the outer wall of the outer side plate (6), the height of the rotary groove (8122) is equal to the height of the locking block (811), and the descending groove (8123) is arranged below one side of the rotary groove (8122) far away from the inlet opening (8121).

8. The tire mold with stable open and close mold according to claim 7, wherein the inner side of the outer sleeve plate (821) is provided with clamping blocks (8211) corresponding to the abutting blocks (822), the circumferential array of the clamping blocks (8211) is arranged on the inner wall of the outer sleeve plate (821) and forms a circular ring with the abutting blocks (822), and the outer sleeve plate (821) is further arranged in a vertically sliding manner relative to the outer sleeve plate (6).