Dual-mode electric vulcanizing machine

Abstract

The invention belongs to the technical field of vulcanizing machine manufacturing, and particularly relates to a double-mold electric vulcanizing machine which comprises a rack, two sets of vulcanizing devices are arranged on the rack, each set of vulcanizing device comprises a tire loading manipulator, a tire unloading manipulator, an electric lifter, an upper mold mounting controller, an air bag and a workbench, and the air bag is arranged in the center of the workbench. The upper mold mounting controller is arranged right above the air bag through the electric lifter, the workbench is located in the stroke range of the tire mounting manipulator and the tire dismounting manipulator, and the tire mounting manipulator and the tire dismounting manipulator are located on the two sides of the workbench respectively; the problem that the risk of liquid leakage is caused due to the fact that a die is extruded or lifted through a hydraulic element on an existing vulcanizing machine is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of vulcanizing machine manufacturing, and specifically relates to a dual-mode electric vulcanizing machine. Background Art

[0002] The current vulcanizer cannot automatically load (install tires) and unload, and there are many hydraulic components on the existing vulcanizer, which are used to extrude or lift the mold, resulting in the need for a liquid source and even the risk of leakage. Therefore, it is necessary to design a pure electric vulcanizer that can automatically load and unload. Summary of the invention

[0003] The purpose of this application is mainly to address the shortcomings of the prior art. By setting up a tire loading and unloading robot, an electric lifter, an upper mold installation controller, an airbag, and a workbench, a dual-mode electric vulcanizer is designed, so that the tire loading and unloading robot can realize loading and unloading. Then, when in use, the lower mold is installed on the workbench, and the upper mold is installed on the upper mold installation controller. The electric lifter is used to control the upper and lower molds to close the mold to realize tire vulcanization, which solves the problem of the current vulcanizer using hydraulic components to extrude or lift the mold, thereby causing the risk of leakage.

[0004] In order to achieve the above purpose, the technical solution adopted in this application is: A dual-mode electric vulcanizer comprises a frame, on which two groups of vulcanizing devices are arranged, each group of vulcanizing devices comprises a tire loading robot, a tire unloading robot, an electric lifter, an upper mold installation controller, an airbag, and a workbench, wherein the airbag is arranged at the center of the workbench, the upper mold installation controller is arranged directly above the airbag through the electric lifter, the workbench is within the travel range of the tire loading robot and the tire unloading robot, and the tire loading robot and the tire unloading robot are separated on both sides of the workbench.

[0005] Preferably, the tire installing robot and the tire removing robot have the same structure.

[0006] Preferably, the electric lifter includes a lifting motor, a lifting screw, a guide rod, and a cross beam. The output shaft of the lifting motor is connected to the lifting screw through a reducer transmission. The lifting screw and the guide rod are both vertically arranged on the workbench. The guide rod is parallel to the lifting screw. The cross beam is provided with screw holes and sliding holes. The screw holes are meshed with the two ends of the lifting screw. The sliding holes are slidably connected with the two ends of the guide rod. The upper mold installation controller is arranged on the cross beam away from the screw holes and the sliding holes.

[0007] Preferably, the tire mounting robot comprises a lifting device and a gripping device, the lifting device is arranged on the frame, and the gripping device is arranged at the execution end of the lifting device.

[0008] Preferably, the lifting device includes a first motor, a rack, and a mounting seat, the rack is vertically arranged on the frame, the top end of the rack is higher than the workbench, and the bottom end of the rack is flush with the workbench, the first motor is arranged on the mounting seat, and the output shaft of the first motor is provided with a first gear meshing with the rack, the mounting seat is vertically slidably arranged on the frame, the top end of the sliding path of the mounting seat is above the workbench, and the bottom end of the sliding path of the mounting seat is flush with the workbench or located below the workbench.

[0009] Preferably, the gripping device includes a second motor, a main annular frame, an arc-shaped groove, an arc-shaped external rack, a clamping rod, a secondary annular frame, and a connecting arm, the connecting arm is arranged on the mounting seat, the connecting arm is parallel to the workbench, the main annular frame is fixedly arranged on one end of the connecting arm away from the mounting seat, the plane where the ring of the main annular frame is located is parallel to the workbench, a plurality of slide rails are evenly distributed on the lower surface of the main annular frame around the center of the main annular frame, the slide rails are slidably connected to the main annular frame, the slide rails are parallel to the workbench and all point to the center of the main annular frame, the clamping rod is fixedly arranged on one end of the slide rail facing the center of the main annular frame, the clamping rod is perpendicular to the plane where the ring of the main annular frame is located, a first column is vertically arranged on the lower surface of the slide rail, a first roller is coaxially arranged on the first column, the secondary annular frame is slidably connected to the bottom of the main annular frame, the secondary annular frame is concentric with the main annular frame, and the secondary annular frame is relatively The sliding path of the main annular frame is a virtual circle A concentric with the main annular frame, and a plurality of arc grooves are evenly distributed on the secondary annular frame around the center of the virtual circle A. The end of the first column facing away from the slide rail is slidably connected between the two ends of the arc groove, and the plane where the arc of the arc groove is located is parallel to the plane where the virtual circle A is located. One end of the arc groove is directly below the virtual circle A, and the other end is directly below the outside of the virtual circle A. The secondary annular frame is provided with the arc-shaped external rack, and the virtual circle B where the arc of the arc-shaped external rack is located is concentric with the secondary annular frame. The main annular frame is provided with the second motor, and the output shaft of the second motor is coaxially provided with a second gear meshing with the arc-shaped external rack. A closed annular sliding groove is coaxially provided on the outer circumferential surface of the main annular frame, and a second column is provided on the upper surface of the secondary annular frame. A second roller is coaxially provided on the upper end of the second column, and the circumferential surface of the second roller is rollingly connected with the sliding groove.

[0010] Preferably, the upper mold installation controller includes a third motor and a mold sleeve, the mold sleeve is arranged on the electric lifter, the opening of the mold sleeve faces downward, the projection of the inner surface of the mold sleeve on the plane where its axis is located is an isosceles trapezoid, the shape and size of the opening of the mold sleeve is larger than the shape and size of the inner bottom wall, and a long cylinder with openings at both ends is provided on the upper surface of the mold sleeve, the lower end opening of the long cylinder passes through the lower surface of the mold sleeve, the third motor is fixedly installed on the upper end of the long cylinder, the output shaft of the third motor is coaxially located in the long cylinder, the output shaft of the third motor is coaxially provided with a driving screw in the long cylinder, and a nut threadedly matched with the two ends of the driving screw is axially slidably provided in the long cylinder, and a mold installation head is fixedly connected to the lower surface of the nut.

[0011] Preferably, a locking rod is provided on the lower surface of the mold sleeve at a position away from the opening, the locking rod is perpendicular to the workbench, a plurality of retaining teeth are radially provided on the lower end of the locking rod, a locking sleeve is rotatably provided on the workbench just below the locking rod, the rotation axis of the locking sleeve on the workbench is the central axis of the locking sleeve itself, the opening of the locking sleeve faces upward, the shape and size of the opening of the locking sleeve are consistent with the shape and size of the projection of the locking rod on the workbench, a locking motor is provided on the lower surface of the workbench, and the output shaft of the locking motor is transmission-connected to the locking sleeve.

[0012] Compared with the prior art, this application has the following beneficial effects: 1. The present application designs a dual-mode electric vulcanizer by arranging a tire loading and unloading robot, a tire unloading robot, an electric lifter, an upper mold installation controller, an airbag, and a workbench, so that the tire loading and unloading robot can realize loading and unloading. Then, when in use, the lower mold is installed on the workbench, and the upper mold is installed on the upper mold installation controller. The upper mold and the lower mold are controlled by the electric lifter to close the mold to realize tire vulcanization, which solves the problem of the current vulcanizer using hydraulic components to extrude or lift the mold, thereby causing the risk of leakage.

[0013] 2. In the present application, the lifting motor drives the lifting screw to rotate, thereby driving the crossbeam to slide up and down between the two ends of the guide rod, thereby controlling the upper mold installation controller to move up and down.

[0014] 3. In the present application, the first motor drives the first gear to rotate, thereby driving the mounting seat to move up and down on the frame 1, thereby facilitating the gripping device to place the tire into the lower mold or to facilitate the gripping device to take the tire out of the lower mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 for Figure 1 The enlarged view of point A in the middle; Figure 3 for Figure 1 The structural diagram on the back; Figure 4 for Figure 3 The enlarged view of point B in the middle; Figure 5 for Figure 3 Enlarged view of point C in the middle; Figure 6 A schematic diagram of the structure for installing the controller for the upper die; Figure 7 for Figure 3 A front view of Figure 8 for Figure 7 Schematic diagram of the structure at D in the figure.

[0016] Among them, 1. frame; 2. workbench; 3. lifting motor; 4. lifting screw; 5. guide rod; 6. crossbeam; 7. first motor; 8. rack; 9. mounting seat; 10. second motor; 11. main annular frame; 12. arc groove; 13. arc outer rack; 14. clamping rod; 15. secondary annular frame; 16. connecting arm; 17. slide rail; 18. locking motor; 19. first column; 20. first roller; 21. third motor; 22. locking sleeve; 24. second gear; 25. sliding groove; 26. second column; 27. mold sleeve; 28. long cylinder; 29. ​​driving screw; 30. nut; 31. mold mounting head; 32. locking rod; 33. retaining tooth; 34. first gear; 35. second roller. DETAILED DESCRIPTION

[0017] like Figure 1-8 As shown, a dual-mode electric vulcanizer includes a frame 1, on which two groups of vulcanizing devices are arranged, each group of vulcanizing devices includes a tire loading robot, a tire unloading robot, an electric lifter, an upper mold installation controller, an airbag, and a workbench 2, the airbag is arranged at the center of the workbench 2, the upper mold installation controller is arranged directly above the airbag through the electric lifter, the workbench 2 is within the travel range of the tire loading robot and the tire unloading robot, and the tire loading robot and the tire unloading robot are separated on both sides of the workbench 2.

[0018] In this embodiment, when in use, the upper mold is mounted on the upper mold mounting controller, and the lower mold is mounted on the workbench 2. Afterwards, the tire mounting manipulator grabs the green tire (unvulcanized tire) into the lower mold on the workbench 2, and then the electric lifter controls the upper mold to cover the lower mold, and the airbag on the workbench 2 is inflated to fill the inside of the green tire, and then the upper and lower molds are heated to vulcanize the green tire. After the vulcanization is completed, the electric lifter rises to separate the upper mold from the lower mold, and the tire unloading manipulator can take out the vulcanized tire, thus completing the vulcanization process. The entire process is all electronically controlled without hydraulic components.

[0019] As a preferred mode, the tire installation robot and the tire removal robot have the same structure. Designed like this, it is convenient to manufacture and assemble, and at the same time, before manufacturing, it is convenient to prepare the materials for manufacturing.

[0020] As a preferred mode, the electric lifter includes a lifting motor 3, a lifting screw 4, a guide rod 5, and a crossbeam 6. The output shaft of the lifting motor 3 is connected to the lifting screw 4 through a reducer transmission. The lifting screw 4 and the guide rod 5 are both vertically arranged on the workbench 2. The guide rod 5 is parallel to the lifting screw 4. The crossbeam 6 is provided with a screw hole and a sliding hole. The screw hole is meshed with the two ends of the lifting screw 4. The sliding hole is slidably connected with the two ends of the guide rod 5. The upper mold installation controller is arranged on the crossbeam 6 away from the screw hole and the sliding hole. After such a design, the lifting motor 3 drives the lifting screw 4 to rotate, thereby driving the crossbeam 6 to slide up and down between the two ends of the guide rod 5, thereby realizing the action of controlling the upper mold installation controller to move up and down.

[0021] As a preferred embodiment, the tire mounting robot comprises a lifting device and a gripping device. The lifting device is arranged on the frame 1, and the gripping device is arranged at the execution end of the lifting device.

[0022] As a preferred mode, the lifting device includes a first motor 7, a rack 8, and a mounting seat 9. The rack 8 is vertically arranged on the frame 1, the top of the rack 8 is higher than the workbench 2, and the bottom of the rack 8 is flush with the workbench 2. The first motor 7 is arranged on the mounting seat 9, and the output shaft of the first motor 7 is provided with a first gear 34 meshing with the rack 8. The mounting seat 9 is vertically slidably arranged on the frame 1, the top of the sliding path of the mounting seat 9 is above the workbench 2, and the bottom of the sliding path of the mounting seat 9 is flush with the workbench 2 or located below the workbench 2. With this design, the first motor 7 drives the first gear 34 to rotate, thereby driving the mounting seat 9 to move up and down on the frame 1, thereby facilitating the gripping device to put the tire into the lower mold or facilitating the gripping device to take the tire out of the lower mold.

[0023] As a preferred embodiment, the gripping device includes a second motor 10, a main annular frame 11, an arc groove 12, an arc-shaped outer rack 13, a clamping rod 14, a secondary annular frame 15, and a connecting arm 16. The connecting arm 16 is arranged on the mounting seat 9, and the connecting arm 16 is parallel to the workbench 2. The main annular frame 11 is fixedly arranged on one end of the connecting arm 16 away from the mounting seat 9. The plane where the ring of the main annular frame 11 is located is parallel to the workbench 2. A plurality of slide rails 17 are evenly distributed on the lower surface of the main annular frame 11 around the center of the main annular frame 11, and the slide rails 17 are slidably connected to the main annular frame 11. The slide rail 17 is parallel to the workbench 2 and points to the center of the main annular frame 11. The clamping rod 14 is fixedly arranged at one end of the slide rail 17 facing the center of the main annular frame 11. The clamping rod 14 is perpendicular to the plane where the ring of the main annular frame 11 is located. A first column 19 is vertically arranged on the lower surface of the slide rail 17. A first roller 20 is coaxially arranged on the first column 19. The secondary annular frame 15 is slidably connected to the bottom of the main annular frame 11. The secondary annular frame 15 is concentric with the main annular frame 11. The sliding path of the secondary annular frame 15 relative to the main annular frame 11 is concentric with the main annular frame 11. Virtual circle A, a plurality of arc grooves 12 are evenly distributed on the secondary annular frame 15 around the center of the virtual circle A, one end of the first column 19 facing away from the slide rail 17 is slidably connected between the two ends of the arc groove 12, and the first column 19 is slidably connected (or rollingly connected) with the two ends of the arc groove 12 through the first roller 20, and the setting of the first roller 20 reduces the friction force of the first column 19 moving between the two ends of the arc groove 12; the plane where the arc of the arc groove 12 is located is parallel to the plane where the virtual circle A is located, one end of the arc groove 12 is directly below the virtual circle A, and the other end is above the virtual circle A. Directly below the outside, the arc-shaped external rack 13 is provided on the secondary annular frame 15, and the virtual circle B where the arc of the arc-shaped external rack 13 is located is concentric with the secondary annular frame 15. The second motor 10 is provided on the main annular frame 11, and the second gear 24 meshing with the arc-shaped external rack 13 is coaxially provided on the output shaft of the second motor 10. A closed annular sliding groove 25 is coaxially provided on the outer circumferential surface of the main annular frame 11, and a second column 26 is provided on the upper surface of the secondary annular frame 15. A second roller 35 is coaxially provided on the upper end of the second column 26, and the circumferential surface of the second roller 35 is rollingly connected with the sliding groove 25.After such arrangement, when the second motor 10 is working and drives the second gear 24 to rotate in the forward direction, the arc-shaped outer rack 13 is driven to rotate around the center of the secondary annular frame 15, thereby causing the secondary annular frame 15 to rotate. Since the secondary annular frame 15 is provided with an arc-shaped groove 12, the combined action of the arc-shaped groove 12 and the slide rail 17 drives the clamping rod 14 to move toward the center of the main annular frame 11 to achieve a clamping action; and when the second motor 10 is working and drives the second gear 24 to rotate in the reverse direction, the clamping rod 14 is driven to move away from the center of the main annular frame 11 to achieve a releasing action.

[0024] As a preferred embodiment, the upper mold installation controller includes a third motor 21 and a mold sleeve 27. The mold sleeve 27 is arranged on the electric lifter. The opening of the mold sleeve 27 is downward. The projection of the inner surface of the mold sleeve 27 on the plane where its axis is located is an isosceles trapezoid. The shape and size of the opening of the mold sleeve 27 are larger than the shape and size of the inner bottom wall. A long cylinder 28 with openings at both ends is provided on the upper surface of the mold sleeve 27. The lower end opening of the long cylinder 28 penetrates through the lower surface of the mold sleeve 27. The upper end of the long cylinder 28 is fixedly installed with the third motor 21. The output shaft of the third motor 21 is coaxially located in the long cylinder 28. The output shaft of the third motor 21 is coaxially provided with a drive screw 29 in the long cylinder 28. A nut 30 threadedly matched with the two ends of the drive screw 29 is axially slidably provided in the long cylinder 28. A mold installation head 31 is fixedly connected to the lower surface of the nut 30. After such a design, Figure 6 As shown, the third motor 21 drives the screw 29 to rotate, so as to control the rise and fall of the mold mounting head 31 relative to the mold sleeve 27. As the upper mold used in the vulcanization process is a result of many petals, Figure 6 In the embodiment, the inner side wall of the mold sleeve 27 is inclined, so when the upper mold rises relative to the mold sleeve 27, the upper mold is retracted. After the vulcanization is completed, the third motor 21 drives the driving screw 29 to rotate, thereby controlling the mold mounting head 31 to descend relative to the mold sleeve 27, and the upper mold automatically spreads out, thereby releasing the vulcanized tire, so that the vulcanized tire remains in the lower mold, waiting to be clamped by the tire unloading robot.

[0025] As a preferred embodiment, a locking rod 32 is provided on the lower surface of the mold sleeve 27 away from the opening, and the locking rod 32 is perpendicular to the workbench 2. A plurality of retaining teeth 33 are radially provided on the lower end of the locking rod 32. A locking sleeve 22 is rotatably provided on the workbench 2 just below the locking rod 32. The rotation axis of the locking sleeve 22 on the workbench 2 is the central axis of the locking sleeve 22 itself, and the opening of the locking sleeve 22 is upward. The shape and size of the opening of the locking sleeve 22 are consistent with the shape and size of the projection of the locking rod 32 on the workbench 2. A locking motor 18 is provided on the lower surface of the workbench 2, and the output shaft of the locking motor 18 is transmission-connected to the locking sleeve 22. After such arrangement, during the vulcanization process, that is, after the electric lifter closes the upper mold and the lower mold, the locking rod 32 is inserted into the locking sleeve 22, and then the locking motor 18 drives the locking sleeve 22 to rotate a certain angle, so that the blocking teeth 33 on the locking rod 32 are blocked by the protruding part at the opening of the locking sleeve 22, thereby achieving locking. This can prevent the situation in which the airbag is inflated and the upper mold and the lower mold are stretched apart during the vulcanization process.

Claims

1. A dual-mode electric vulcanizing machine, characterized in that: The invention comprises a frame (1), wherein two sets of vulcanizing devices are arranged on the frame (1), each set of vulcanizing devices comprises a tire loading robot, a tire unloading robot, an electric lifter, an upper mold installation controller, an air bag, and a workbench (2), wherein the air bag is arranged at the center of the workbench (2), the upper mold installation controller is arranged directly above the air bag through the electric lifter, the workbench (2) is within the travel range of the tire loading robot and the tire unloading robot, and the tire loading robot and the tire unloading robot are located on both sides of the workbench (2).

2. A dual-mode electric vulcanizing machine according to claim 1, characterized in that: The tire loading robot and the tire unloading robot have the same structure.

3. A dual-mode electric vulcanizing machine according to claim 2, characterized in that: The electric lifter comprises a lifting motor (3), a lifting screw (4), a guide rod (5), and a crossbeam (6); the output shaft of the lifting motor (3) is connected to the lifting screw (4) via a reducer transmission; the lifting screw (4) and the guide rod (5) are both vertically arranged on the workbench (2); the guide rod (5) is parallel to the lifting screw (4); a screw hole and a sliding hole are arranged on the crossbeam (6); the screw hole is meshed with two ends of the lifting screw (4); the sliding hole is slidably connected with two ends of the guide rod (5); and the upper mold mounting controller is arranged on the crossbeam (6) at a position away from the screw hole and the sliding hole.

4. A dual-mode electric vulcanizing machine according to claim 2, characterized in that: The tire mounting robot comprises a lifting device and a gripping device, wherein the lifting device is arranged on the frame (1), and the gripping device is arranged at the execution end of the lifting device.

5. A dual-mode electric vulcanizing machine according to claim 4, characterized in that: The lifting device comprises a first motor (7), a rack (8), and a mounting seat (9); the rack (8) is vertically arranged on the frame (1); the top end of the rack (8) is higher than the workbench (2); the bottom end of the rack (8) is flush with the workbench (2); the first motor (7) is arranged on the mounting seat (9); the output shaft of the first motor (7) is provided with a first gear (34) meshing with the rack (8); the mounting seat (9) is vertically slidably arranged on the frame (1); the top end of the sliding path of the mounting seat (9) is above the workbench (2); the bottom end of the sliding path of the mounting seat (9) is flush with the workbench (2) or located below the workbench (2).

6. A dual-mode electric vulcanizing machine according to claim 5, characterized in that: The gripping device comprises a second motor (10), a main annular frame (11), an arcuate groove (12), an arcuate outer rack (13), a clamping rod (14), a secondary annular frame (15), and a connecting arm (16); the connecting arm (16) is arranged on the mounting seat (9); the connecting arm (16) is parallel to the workbench (2); the main annular frame (11) is fixedly arranged at one end of the connecting arm (16) away from the mounting seat (9); the plane where the ring of the main annular frame (11) is located is parallel to the workbench (2); a plurality of slide rails (17) are evenly distributed on the lower surface of the main annular frame (11) around the center of the main annular frame (11); The slide rail (17) is slidably connected to the main annular frame (11), the slide rail (17) is parallel to the workbench (2) and points to the center of the main annular frame (11), the clamping rod (14) is fixedly arranged on one end of the slide rail (17) facing the center of the main annular frame (11), the clamping rod (14) is perpendicular to the plane where the ring of the main annular frame (11) is located, a first column (19) is vertically arranged on the lower surface of the slide rail (17), and a first roller (20) is coaxially arranged on the first column (19), the auxiliary annular frame (15) is slidably connected to the bottom of the main annular frame (11), and the auxiliary annular frame (15) is slidably connected to the main annular frame (11). The auxiliary annular frame (15) is concentric with the main annular frame (11), the sliding path of the auxiliary annular frame (15) relative to the main annular frame (11) is a virtual circle A concentric with the main annular frame (11), a plurality of arc grooves (12) are evenly distributed around the center of the virtual circle A on the auxiliary annular frame (15), one end of the first column (19) facing away from the slide rail (17) is slidably connected between the two ends of the arc groove (12), the plane where the arc of the arc groove (12) is located is parallel to the plane where the virtual circle A is located, one end of the arc groove (12) is directly below the virtual circle A, and the other end is directly below the virtual circle A, and the auxiliary annular frame (15) is provided with the arc groove (12). An external rack (13), a virtual circle B where the arc of the arc-shaped external rack (13) is located is concentric with the secondary annular frame (15), the second motor (10) is provided on the main annular frame (11), a second gear (24) meshing with the arc-shaped external rack (13) is coaxially provided on the output shaft of the second motor (10), a closed annular sliding groove (25) is coaxially provided on the outer circumferential surface of the main annular frame (11), a second column (26) is provided on the upper surface of the secondary annular frame (15), a second roller (35) is coaxially provided on the upper end of the second column (26), and the circumferential surface of the second roller (35) is rollingly connected to the sliding groove (25).

7. A dual-mode electric vulcanizing machine according to claim 1, characterized in that: The upper mold installation controller comprises a third motor (21) and a mold sleeve (27). The mold sleeve (27) is arranged on the electric lifter. The opening of the mold sleeve (27) faces downward. The projection of the inner surface of the mold sleeve (27) on the plane where its axis is located is an isosceles trapezoid. The shape and size of the opening of the mold sleeve (27) are larger than the shape and size of the inner bottom wall. A long tube (28) with openings at both ends is provided on the upper surface of the mold sleeve (27). The lower end opening of the long tube (28) penetrates through the lower surface of the mold sleeve (27). The upper end of the long tube (28) is fixedly installed with the third motor (21). The output shaft of the third motor (21) is coaxially located in the long tube (28). The output shaft of the third motor (21) is coaxially provided with a driving screw (29) in the long tube (28). A nut (30) threadedly matched with the two ends of the driving screw (29) is axially slidably provided in the long tube (28). A mold installation head (31) is fixedly connected to the lower surface of the nut (30).

8. A dual-mode electric vulcanizing machine according to claim 7, characterized in that: A locking rod (32) is provided on the lower surface of the mold sleeve (27) at a position away from the opening, the locking rod (32) being perpendicular to the workbench (2), a plurality of retaining teeth (33) being radially provided at the lower end of the locking rod (32), a locking sleeve (22) being rotatably provided on the workbench (2) just below the locking rod (32), the rotation axis of the locking sleeve (22) on the workbench (2) being the central axis of the locking sleeve (22), the opening of the locking sleeve (22) facing upward, the shape and size of the opening of the locking sleeve (22) being consistent with the shape and size of the projection of the locking rod (32) on the workbench (2), and a locking motor (18) being provided on the lower surface of the workbench (2), the output shaft of the locking motor (18) being drivingly connected to the locking sleeve (22).

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