Tire mold ejection device

Abstract

The present invention relates to the technical field of tire molds, and discloses a tire mold ejection device, including a mold table, and also including: an L-shaped frame, which is fixedly installed on the top of the mold table; a turntable, which is horizontally rotatably installed at the center of the top of the mold table; an upper mold, which is horizontally arranged below the horizontal side of the L-shaped frame, and a mold core is installed at the bottom of the upper mold; a lower mold, which has two lower molds, and each lower mold has a mold cavity on the top; a detection limit assembly, which has two detection limit assemblies, and the two detection limit assemblies are respectively installed inside the two lower molds. After the upper mold and the lower mold are opened, the present invention can detect the temperature of the mold cavity by mercury based on the principle of thermal expansion and contraction. When the temperature of the mold cavity is within a reasonable temperature range, the ejector rod can be moved upward to realize tire demoulding, thereby avoiding the high temperature of the mold cavity, which causes adhesion between the mold cavity and the molded tire, and the molded tire is pulled when demoulding, thereby improving the quality of tire production demoulding.

Description

Technical Field

[0001] The invention relates to the technical field of tire molds, and in particular to a tire mold ejection device. Background Art

[0002] Tires are circular elastic rubber products that are assembled on various vehicles or machines and roll on the ground. Tires are important accessories on toy cars. Toy cars are toys for children to play with that are based on the basic structure and appearance of a car but are reduced in proportion to a certain scale. The structures of toy cars include inertial, mechanical, electric, and electric remote control types.

[0003] For example, a toy car tire efficient injection molding mold disclosed in the patent with announcement number CN218948293U can produce tires, but it does not have the function of detecting the mold cavity temperature when demolding. If the mold cavity temperature is too high, the molded tire will be adhered to the inner wall of the mold cavity, causing the tire to be easily torn during demolding, thereby reducing the quality of tire manufacturing. Therefore, it is urgent to design a tire mold ejection device. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art and to propose a tire mold ejection device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A tire mold ejection device includes a mold platform and further includes:

[0007] L-shaped frame, the L-shaped frame is fixedly installed on the top of the mold platform, and the vertical side of the L-shaped frame is set vertically;

[0008] Turntable, which is installed horizontally at the top center of the mold platform;

[0009] The upper mold is horizontally arranged below the horizontal side of the L-shaped frame, and a mold core is installed at the bottom of the upper mold;

[0010] There are two lower molds, which are symmetrically installed on the top of the turntable. A mold cavity is opened on the top of each lower mold, and each lower mold is hollow inside;

[0011] A mold connection assembly is arranged on the horizontal side of the L-shaped frame and is used to connect the upper mold;

[0012] There are two detection limit assemblies, which are respectively installed inside the two lower molds and are used to detect the temperature of the mold cavity;

[0013] The driving assembly is arranged on the top of the turntable and is used to drive the detection limit assembly to work.

[0014] As a further technical solution of the present invention, the mold connection assembly includes: a hydraulic telescopic rod, there are two hydraulic telescopic rods, the two hydraulic telescopic rods are vertically symmetrically installed on the top of the horizontal side of the L-shaped frame, and the output ends of the two hydraulic telescopic rods both pass through the horizontal side of the L-shaped frame and are fixedly installed on the top of the upper mold.

[0015] As a further technical solution of the present invention, the driving assembly includes: a circular ring, which is rotatably arranged on the top of the turntable, and four L-shaped fixed plates evenly arranged in a ring shape are fixedly installed on the outside of the circular ring, and the ends of the vertical sides of the four L-shaped fixed plates are fixedly installed on the top of the mold platform, and two arc-shaped racks symmetrically arranged at the center are fixedly installed on the top of the circular ring.

[0016] As a further technical solution of the present invention, the detection limit assembly includes: a disc, which is horizontally arranged inside the lower mold, and a plurality of push rods are vertically fixedly installed on the outer edge of the top of the disc, and the plurality of push rods are evenly distributed in a ring shape with equal intervals, and a plurality of through holes adapted to the push rods are opened at the bottom of the mold cavity, and the top ends of the plurality of push rods all pass through corresponding through holes, and the surfaces of the push rods are slidably arranged inside the corresponding through holes.

[0017] As a further technical solution of the present invention, a slide plate is slidably arranged at the bottom of the lower mold. There are two slide plates, which are symmetrically arranged in the lower mold. Two symmetrically arranged movable rods are rotatably installed on the top of each slide plate, and the ends of the four movable rods away from the slide plate are rotatably installed at the bottom of the disc.

[0018] As a further technical solution of the present invention, a bidirectional lead screw and a limit column are horizontally rotatably installed inside the lower mold. The surface of the limit column is slidably arranged inside the slide plate. Reciprocating threads in opposite directions are provided at both ends of the bidirectional lead screw. Both ends of the bidirectional lead screw are connected to the inside of the slide plate through reciprocating threads.

[0019] As a further technical solution of the present invention, a torsion shaft is rotatably installed on the outside of the lower mold, a gear is installed on the end of the torsion shaft away from the lower mold, the other end of the torsion shaft passes through the side of the lower mold, and the end of the torsion shaft away from the gear is installed at the center of the end face of the bidirectional screw. When the gear and the arc rack are in contact, the gear and the arc rack are meshed.

[0020] As a further technical solution of the present invention, a hollow ring is horizontally arranged inside the lower mold, the hollow ring is fixedly sleeved on the outer surface of the mold cavity, a U-shaped tube is installed on the outside of the hollow ring, mercury is arranged inside the hollow ring and the U-shaped tube, a piston disk is slidably arranged inside the lower horizontal edge of the U-shaped tube, and springs are horizontally fixed on the side of the piston disk and the inner end of the U-shaped tube.

[0021] As a further technical solution of the present invention, a ring is fixedly sleeved at the center of the surface of the bidirectional screw, and a plurality of circular grooves evenly distributed in an annular shape are opened on the surface of the ring. A plug rod is horizontally fixedly installed at the center of the side of the piston disk, and the end of the plug rod away from the piston disk passes through a U-shaped tube. A cylindrical cone is fixedly installed on the top of the plug rod, and the cylindrical cone and the circular groove are adapted to each other.

[0022] As a further technical solution of the present invention, a driving motor is installed at the bottom center of the mold table, and the output end of the driving motor passes through the mold table and is fixedly installed at the bottom center of the turntable. An injection tube is provided at the top of the horizontal side of the L-shaped frame, and the end of the injection tube passes through the horizontal side of the L-shaped frame and is installed on the upper mold, sliding between the surface of the injection tube and the horizontal side of the L-shaped frame.

[0023] The beneficial effects of the present invention are:

[0024] Firstly, the present invention can detect the temperature of the mold cavity by mercury based on the principle of thermal expansion and contraction after the upper mold and the lower mold are opened by setting the detection limit assembly. Only when the temperature of the mold cavity is within a reasonable temperature range can the ejector rod be moved upward to realize demolding of the tire, thereby avoiding the high temperature of the mold cavity causing adhesion between the mold cavity and the molded tire, and causing the molded tire to be strained during demolding, thereby improving the quality of tire production during demolding;

[0025] Secondly, the present invention can continuously and alternately use the two lower molds by detecting the settings of the limit assembly, the drive assembly and the drive motor, thereby avoiding the situation where there is only a single lower mold, resulting in the need to wait for the molded tire on the lower mold to be removed and then the molds to be closed after the upper mold and the lower mold are opened. In addition, when the turntable rotates to alternate the two lower molds, the ejector rod can also automatically move up and down to realize automatic ejection of the molded tire, thereby improving the use efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic structural diagram of a tire mold ejection device proposed by the present invention;

[0027] Figure 2 A bottom view schematic diagram of the structure of a tire mold ejection device proposed by the present invention;

[0028] Figure 3 This is a schematic structural diagram of a tire mold ejection device proposed by the present invention after removing the L-shaped frame;

[0029] Figure 4 A schematic diagram of the cross-sectional structure of a lower mold of a tire mold ejection device proposed by the present invention;

[0030] Figure 5 for Figure 4 A magnified schematic diagram of part A;

[0031] Figure 6 This is a schematic structural diagram of a tire mold ejection device proposed by the present invention after the lower mold is removed;

[0032] Figure 7 for Figure 6 A magnified schematic diagram of part B;

[0033] Figure 8 The present invention provides a schematic diagram of the internal structure of a lower mold of a tire mold ejection device.

[0034] In the figure: 1. mold base; 2. L-shaped frame; 3. turntable; 4. upper mold; 5. lower mold; 6. mold core; 7. mold cavity; 8. circular ring; 9. L-shaped fixing plate; 10. hydraulic telescopic rod; 11. injection tube; 12. torque shaft; 13. arc rack; 14. driving motor; 15. U-shaped tube; 16. ejector rod; 17. circular disk; 18. bidirectional lead screw; 19. slide plate; 20. limit column; 21. movable rod; 22. sleeve ring; 23. circular groove; 24. insert rod; 25. column cone; 26. gear; 27. piston disk; 28. spring; 29. ​​hollow ring. DETAILED DESCRIPTION

[0035] The following is a detailed description of a tire mold ejection device provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0036] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0037] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0038] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0039] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0040] Please refer to the attached Figure 1 -Attached Figure 8 , a tire mold ejection device includes a mold platform 1, and also includes: an L-shaped frame 2, a turntable 3, an upper mold 4, a lower mold 5, a mold connecting component, a detection limit component and a driving component, the L-shaped frame 2 is fixedly installed on the top of the mold platform 1, the vertical side of the L-shaped frame 2 is vertically arranged, the turntable 3 is horizontally rotatably installed at the center of the top of the mold platform 1, the upper mold 4 is horizontally arranged below the horizontal side of the L-shaped frame 2, a mold core 6 is installed at the bottom of the upper mold 4, there are two lower molds 5, the two lower molds 5 are symmetrically installed on the top of the turntable 3, each lower mold 5 has a mold cavity 7 on the top, and each lower mold 5 is hollow inside, the mold connecting component is arranged on the horizontal side of the L-shaped frame 2, the mold connecting component is used to connect the upper mold 4, there are two detection limit components, the two detection limit components are respectively installed inside the two lower molds 5, the detection limit component is used to detect the temperature of the mold cavity 7, the driving component is arranged on the top of the turntable 3, and the driving component is used to drive the detection limit component to work;

[0041] As described above, the tire can be manufactured continuously and stably, and has a self-checking function during manufacturing and demoulding, thereby ensuring the manufacturing quality of the tire.

[0042] Please refer to the attached Figure 1 -Attached Figure 2 In a preferred embodiment, the mold connection assembly includes: a hydraulic telescopic rod 10, two hydraulic telescopic rods 10, the two hydraulic telescopic rods 10 are vertically symmetrically installed on the top of the horizontal side of the L-shaped frame 2, and the output ends of the two hydraulic telescopic rods 10 pass through the horizontal side of the L-shaped frame 2 and are fixedly installed on the top of the upper mold 4;

[0043] Specifically, the upper mold 4 is driven downward by the hydraulic telescopic rod 10. The movement of the upper mold 4 not only drives the injection tube 11 to move downward, but also closes the mold with the lower mold 5. Then the raw material can be injected into the closed lower mold 5 and the upper mold 4 through the injection tube 11.

[0044] Please refer to the attached Figure 1 -Attached Figure 4 In a preferred embodiment, the driving assembly includes: a circular ring 8, which is rotatably arranged on the top of the turntable 3, and four L-shaped fixed plates 9 are fixedly installed on the outer side of the circular ring 8 and evenly arranged in a ring shape, and the ends of the vertical sides of the four L-shaped fixed plates 9 are fixedly installed on the top of the mold platform 1, and two arc-shaped racks 13 symmetrically arranged at the center are fixedly installed on the top of the circular ring 8;

[0045] Furthermore, the L-shaped fixing plate 9 is used to limit and fix the circular ring 8 , and the circular ring 8 is used to support the arc-shaped rack 13 , and the two arc-shaped racks 13 are used to mesh with the two gears 26 .

[0046] Please refer to the attached Figure 1 -Attached Figure 8In a preferred embodiment, the detection limit assembly includes: a disc 17, which is horizontally arranged inside the lower mold 5, and a plurality of ejector rods 16 are vertically fixedly installed on the outer edge of the top of the disc 17. The plurality of ejector rods 16 are evenly distributed in a ring shape with equal spacing. A plurality of through holes adapted to the ejector rods 16 are opened at the bottom of the mold cavity 7, and the tops of the plurality of ejector rods 16 pass through the corresponding through holes. The surfaces of the ejector rods 16 are slidably arranged inside the corresponding through holes. A slide plate 19 is slidably arranged at the bottom of the lower mold 5. There are two slide plates 19, and the two slide plates 19 are symmetrically arranged in the lower mold 5. Two symmetrically arranged movable rods 21 are rotatably installed on the top of each slide plate 19, and the ends of the four movable rods 21 away from the slide plate 19 are rotatably installed at the bottom of the disc 17. A bidirectional lead screw 18 and a limit column 20 are horizontally rotatably installed inside the lower mold 5. The surface of the limit column 20 is slidably arranged inside the slide plate 19, and reciprocating threads in opposite directions are opened at both ends of the bidirectional lead screw 18. Both ends of the bidirectional lead screw 18 are connected to the inside of the slide plate 19 through reciprocating threads. The outer rotation installation of the lower mold 5 A torsion shaft 12 is installed, and a gear 26 is installed at the end of the torsion shaft 12 away from the lower mold 5. The other end of the torsion shaft 12 passes through the side of the lower mold 5. The end of the torsion shaft 12 away from the gear 26 is installed at the center of the end face of the bidirectional screw 18. When the gear 26 and the arc-shaped rack 13 are in contact, the gear 26 and the arc-shaped rack 13 are meshed. A hollow ring 29 is horizontally arranged inside the lower mold 5. The hollow ring 29 is fixedly sleeved on the outer surface of the mold cavity 7. The outer side of the hollow ring 29 is connected to the U-shaped tube 15. The hollow ring 29 and the inside of the U-shaped tube 15 are connected. Mercury is arranged, a piston disc 27 is slidably arranged inside the lower horizontal side of the U-shaped tube 15, a spring 28 is horizontally fixed on the side of the piston disc 27 and the inner end of the U-shaped tube 15, a collar 22 is fixedly sleeved at the center of the surface of the bidirectional lead screw 18, a plurality of circular grooves 23 evenly distributed in an annular shape are opened on the surface of the collar 22, an insertion rod 24 is horizontally fixedly installed at the center of the side of the piston disc 27, the end of the insertion rod 24 away from the piston disc 27 passes through the U-shaped tube 15, a column cone 25 is fixedly installed on the top of the insertion rod 24, and the column cone 25 is adapted to the circular groove 23;

[0047] Preferably, after the upper mold 4 and the lower mold 5 are opened, the temperature of the mold cavity 7 can be detected by mercury based on the principle of thermal expansion and contraction. Only when the temperature of the mold cavity 7 is within a reasonable temperature range can the push rod 16 be moved upward to demold the tire, thereby avoiding the high temperature of the mold cavity 7, which may cause adhesion between the mold cavity 7 and the molded tire, and cause the molded tire to be stretched during demolding.

[0048] Please refer to the attached Figure 1 -Attached Figure 2In a preferred embodiment, a driving motor 14 is installed at the bottom center of the mold platform 1, and the output end of the driving motor 14 passes through the mold platform 1 and is fixedly installed at the bottom center of the turntable 3. An injection tube 11 is provided at the top of the horizontal side of the L-shaped frame 2. The end of the injection tube 11 passes through the horizontal side of the L-shaped frame 2 and is installed on the upper mold 4, and the injection tube 11 slides between the surface of the injection tube 11 and the horizontal side of the L-shaped frame 2;

[0049] Furthermore, the raw material is injected into the lower mold 5 and the upper mold 4 after the mold is closed through the injection tube 11. After the injection is completed, pressure is applied to the lower mold 5 and the upper mold 4 after the mold is closed. The drive motor 14 rotates 180 degrees each time to drive the turntable 3 to rotate, thereby realizing the alternating use of the two lower molds 5.

[0050] The working principle of the present invention is as follows: first, the upper mold 4 is driven to move downward by the hydraulic telescopic rod 10. The movement of the upper mold 4 not only drives the injection tube 11 to move downward, but also closes the mold with the lower mold 5. Then, the raw material can be injected into the closed lower mold 5 and the upper mold 4 through the injection tube 11. After the injection is completed, pressure is applied to the closed lower mold 5 and the upper mold 4. When the display screen shows that the injection, pressure holding and cooling are normal, the upper mold 4 is moved upward by the hydraulic telescopic rod 10 after a period of pressure holding and cooling.

[0051] After the mold is opened, the turntable 3 is driven to rotate by the driving motor 14, and the rotation of the turntable 3 drives the two lower molds 5 to rotate, so that the two lower molds 5 can be exchanged, and the other lower mold 5 and the upper mold 4 can continue to be molded, so as to realize alternating and continuous tire manufacturing;

[0052] When the lower mold 5 with the molded tire rotates, it drives the gear 26 to revolve:

[0053] In the first case, when the temperature of the mold cavity 7 is appropriate, the gear 26 and the arc-shaped rack 13 are in contact, which causes the gear 26 to rotate while revolving, and the rotation of the gear 26 drives the torsion shaft 12 to rotate, and the rotation of the torsion shaft 12 drives the bidirectional lead screw 18 to rotate, and the rotation of the bidirectional lead screw 18 drives the two slides 19 to move, and the movement of the two slides 19 drives the four movable rods 21 to move, and the movement of the four movable rods 21 drives the disc 17 to move upward, and the upward movement of the disc 17 drives the multiple push rods 16 to move upward, so that the push rods 16 can push the molded tire upward to achieve demolding between the tire and the mold cavity 7;

[0054] In the second case, when the temperature of the mold cavity 7 is high, due to the principle of thermal expansion and contraction, the mercury in the hollow ring 29 expands due to heat, pushing the piston disk 27 to move and causing the spring 28 to generate elastic force. The movement of the piston disk 27 drives the insertion rod 24 to move, and the movement of the insertion rod 24 drives the column cone 25 to move. The movement of the column cone 25 will enter the corresponding circular groove 23, and the two-way screw 18 can be limited by the sleeve ring 22. At this time, when the gear 26 and the arc-shaped rack 13 contact and rotate, the torsion shaft 12 will generate torsion and the two-way screw 18 will not rotate, thereby avoiding demolding and straining when the mold cavity 7 and the molded tire are adhered. When the temperature of the cavity 7 drops to a suitable temperature, the mercury no longer expands, and the elastic force generated by the spring 28 causes the piston disc 27 to move back and reset. The piston disc 27 moves back and resets, driving the insertion rod 24 and the column cone 25 to move back and reset, and further separating the column cone 25 from the circular groove 23. At this time, the column cone 25 no longer limits the bidirectional lead screw 18 through the sleeve ring 22, and the torsion force generated by the torsion shaft 12 causes the bidirectional lead screw 18 to rotate. According to the principle of the first case, the rotation of the bidirectional lead screw 18 drives the push rod 16 to move upward, so that the push rod 16 can push the molded tire upward to realize the demolding between the tire and the mold cavity 7;

[0055] When the lower mold 5 after taking the material revolves (rotates to the bottom of the upper mold 4), the gear 26 and the corresponding arc-shaped rack 13 will mesh to make the gear 26 rotate while revolving. The rotation of the gear 26 drives the disc 17 and the push rod 16 to move downward through the torsion shaft 12, the bidirectional lead screw 18 and the movable rod 21 to achieve the reset of the push rod 16, and the push rod 16 can be automatically moved up and down;

[0056] In summary, the tire can be manufactured continuously and stably by reciprocating in sequence, and it has a self-checking function during demoulding, which ensures the manufacturing quality of the tire. The mold is equipped with an information intelligent interface, and the data information on the mold can be transmitted to the intelligent information system through the information intelligent interface, so that the staff can check the dynamics of the mold, thereby making the equipment have intelligent information functions.

[0057] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A tire mold ejection device, comprising a mold table (1), characterized in that: Also includes: An L-shaped frame (2), the L-shaped frame (2) being fixedly mounted on the top of the mold platform (1), and the vertical side of the L-shaped frame (2) being arranged vertically; A turntable (3), the turntable (3) being mounted horizontally and rotatably at the top center of the mold platform (1); An upper mold (4), the upper mold (4) being horizontally arranged below the horizontal side of the L-shaped frame (2), and a mold core (6) being installed at the bottom of the upper mold (4); A lower mold (5), wherein there are two lower molds (5), and the two lower molds (5) are symmetrically mounted on the top of the turntable (3), and each lower mold (5) is provided with a mold cavity (7) on the top, and each lower mold (5) is hollow inside; A mold connection assembly, the mold connection assembly being arranged on a horizontal side of the L-shaped frame (2), and the mold connection assembly being used to connect an upper mold (4); A detection limit assembly, wherein there are two detection limit assemblies, and the two detection limit assemblies are respectively installed inside the two lower molds (5), and the detection limit assemblies are used to detect the temperature of the mold cavity (7); A drive assembly, the drive assembly being arranged on the top of the turntable (3), and the drive assembly being used to drive the detection limit assembly to operate; The mold connection assembly comprises: a hydraulic telescopic rod (10), wherein there are two hydraulic telescopic rods (10), wherein the two hydraulic telescopic rods (10) are vertically symmetrically mounted on the top of the horizontal side of the L-shaped frame (2), wherein the output ends of the two hydraulic telescopic rods (10) both pass through the horizontal side of the L-shaped frame (2) and are both fixedly mounted on the top of the upper mold (4), wherein the drive assembly comprises: a circular ring (8), wherein the circular ring (8) is rotatably mounted on the top of the turntable (3), wherein four L-shaped fixed plates (9) are evenly arranged in an annular shape and are fixedly mounted on the outer side of the circular ring (8), wherein the vertical ends of the four L-shaped fixed plates (9) are fixedly mounted on the top of the mold platform (1), wherein two arc-shaped racks (13) are fixedly mounted on the top of the circular ring (8) and wherein the detection The limiting assembly comprises: a disk (17), the disk (17) being horizontally arranged inside the lower mold (5), a plurality of push rods (16) being vertically fixedly installed on the outer edge of the top of the disk (17), the plurality of push rods (16) being evenly distributed in a circular shape with equal spacing, a plurality of through holes matching the push rods (16) being opened at the bottom of the mold cavity (7), the top ends of the plurality of push rods (16) all passing through the corresponding through holes, the surfaces of the push rods (16) being slidably arranged inside the corresponding through holes, a slide plate (19) being slidably arranged at the bottom of the lower mold (5), two slide plates (19) being symmetrically arranged in the lower mold (5), and two symmetrically arranged movable rods ( 21), the ends of the four movable rods (21) away from the slide plate (19) are rotatably mounted on the bottom of the disc (17), a bidirectional lead screw (18) and a limit column (20) are horizontally rotatably mounted inside the lower mold (5), the limit column (20) is slidably arranged inside the slide plate (19), the two ends of the bidirectional lead screw (18) are provided with reciprocating threads in opposite directions, the two ends of the bidirectional lead screw (18) are connected to the inside of the slide plate (19) through the reciprocating threads, a torsion shaft (12) is rotatably mounted outside the lower mold (5), the end of the torsion shaft (12) away from the lower mold (5) is mounted with a gear (26), the other end of the torsion shaft (12) passes through the side of the lower mold (5), and the torsion shaft (12) away from the gear The end of the gear (26) is installed at the center of the end face of the bidirectional lead screw (18). When the gear (26) and the arc-shaped rack (13) are in contact, the gear (26) and the arc-shaped rack (13) are meshed. A hollow ring (29) is horizontally arranged inside the lower mold (5). The hollow ring (29) is fixedly sleeved on the outer surface of the mold cavity (7). A U-shaped tube (15) is installed on the outer side of the hollow ring (29). Mercury is arranged inside the hollow ring (29) and the U-shaped tube (15). A piston disk (27) is slidably arranged inside the lower horizontal edge of the U-shaped tube (15). A spring (28) is horizontally fixed on the side of the piston disk (27) and the inner end of the U-shaped tube (15). A collar (22) is fixedly sleeved at the center of the surface of the bidirectional lead screw (18).The surface of the sleeve ring (22) is provided with a plurality of circular grooves (23) evenly distributed in an annular shape; a plunger (24) is horizontally fixedly mounted at the center of the side of the piston disc (27); the end of the plunger (24) away from the piston disc (27) passes through the U-shaped tube (15); a column cone (25) is fixedly mounted at the top of the plunger (24); the column cone (25) and the circular groove (23) are matched; a driving motor (14) is mounted at the center of the bottom of the mold platform (1); the output end of the driving motor (14) passes through the mold platform (1) and is fixedly mounted at the center of the bottom of the turntable (3); an injection tube (11) is arranged at the top of the horizontal side of the L-shaped frame (2); the end of the injection tube (11) passes through the horizontal side of the L-shaped frame (2) and is mounted on the upper mold (4); the surface of the injection tube (11) slides between the horizontal side of the L-shaped frame (2); The turntable (3) rotates to drive the two lower molds (5) to rotate, so that the two lower molds (5) can be exchanged, and the other lower mold (5) and the upper mold (4) can continue to be molded; When the lower mold (5) with the molded tire rotates, it drives the gear (26) to revolve; When the temperature of the mold cavity (7) is appropriate, the gear (26) and the arc-shaped rack (13) are in contact, causing the gear (26) to rotate while revolving, the rotation of the gear (26) drives the torsion shaft (12) to rotate, the rotation of the torsion shaft (12) drives the bidirectional lead screw (18) to rotate, the rotation of the bidirectional lead screw (18) drives the two slide plates (19) to move, the movement of the two slide plates (19) drives the four movable rods (21) to move, the movement of the four movable rods (21) drives the disc (17) to move upward, the upward movement of the disc (17) drives the multiple push rods (16) to move upward, so that the push rods (16) can push the molded tire upward to achieve demolding between the tire and the mold cavity (7); When the temperature of the mold cavity (7) is high, the mercury in the hollow ring (29) expands due to the heat, pushing the piston plate (27) to move and causing the spring (28) to generate elastic force. The movement of the piston plate (27) drives the insertion rod (24) to move, and the movement of the insertion rod (24) drives the column cone (25) to move. The column cone (25) moves and enters the corresponding circular groove (23). The two-way lead screw (18) can be limited by the sleeve ring (22). At this time, when the gear (26) and the arc rack (13) contact and rotate, the torsion shaft (12) will generate torque and the two-way lead screw (18) will not rotate.

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