Quick mold changing device of EVA injection molding machine

Abstract

The utility model discloses a quick mould changing device of an EVA (Ethylene Vinyl Acetate) injection molding machine, which comprises a mould closing structure, fixing structures are arranged on the upper side and the lower side in the mould closing structure, a mould changing structure is arranged on the rear side in the mould closing structure, an injection mechanism is arranged on the rear side of the top of the mould closing structure, and the mould changing structure comprises a cross rotating plate. A round fixing hole penetrating to the bottom is formed in the top of the cross-shaped rotating plate, a fixing column is fixedly connected to the inner wall of the round fixing hole, by arranging a fixing structure, mounting and dismounting of the upper mold and the lower mold are more convenient, and therefore the mold replacement efficiency is improved, the molds are adsorbed and fixed through an electromagnetic block, and the mold replacement efficiency is improved. And by arranging the mold replacing structure, the mold replacing process is more efficient, the automation degree is high, the complexity of manual operation is reduced, the whole mold replacing process is smooth and rapid, and the production efficiency and flexibility are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of injection molding equipment technology, specifically to a quick mold change device for an EVA injection molding machine. Background Technology

[0002] In the injection molding process, mold changing is a time-consuming and complex step, especially for EVA material injection molding. EVA (ethylene vinyl acetate) injection molding machines are specialized machinery for producing plastic products, particularly for manufacturing EVA footwear (including sandals, flip-flops, and athletic shoes). The EVA injection molding machine injects EVA foam material into the mold, and through heating and pressurization, shapes the material into the desired form, creating soft, lightweight, and flexible soles and other components. EVA injection molding machines mainly consist of two parts: an injection unit and a clamping unit. The injection unit can be fixed horizontally or vertically. Most EVA injection molding machines are designed to be horizontal, while vertical machines primarily utilize gravity for the production of special molded products. In addition, injection molding machines also include mechanical components, hydraulic components, electrical components, and an industrial PC control system.

[0003] According to patent document CN208962321U, an injection molding machine, specifically a quick mold change device for an injection molding machine, comprises a frame. An electric motor is housed inside the frame, and a B pulley is mounted on the output shaft of the motor. The B pulley is connected to an A pulley via a belt, and the A pulley is connected to the end of an A screw. A bracket is located at the top of the frame, and a support plate is mounted on the top of the bracket. The end of the support plate is hinged to a folding plate via a rotating shaft. An A screw is located inside the support plate, and the A screw is threadedly connected to an A screw block located inside a push plate. The end of the A screw is connected to one end of a connecting rod via a coupling, and the other end of the connecting rod is equipped with an internal gear that meshes with a gear. This device lifts the mold using a folding plate or support plate, and drives the mold's lateral movement via a push plate, thereby achieving quick mold change, improving work efficiency and safety. The folding plate 3 can be folded back when idle to save workspace, and the engagement / disengagement of the folding plate is achieved through the cooperation of internal and external gears.

[0004] In traditional mold changing processes, manual handling and replacement of molds are usually required. This is not only cumbersome but also relatively inefficient. Furthermore, due to the limitations of manual operation, molds may become unstable during the change process, which not only affects production efficiency but also poses safety hazards. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a quick mold changing device for EVA injection molding machines, thereby achieving rapid mold replacement.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a quick mold changing device for an EVA injection molding machine, comprising a mold closing structure, wherein fixed structures are provided on both the upper and lower sides inside the mold closing structure, a mold changing structure is provided on the rear side inside the mold closing structure, and an injection mechanism is provided on the rear top side of the mold closing structure.

[0007] The mold-closing structure includes a mounting frame. Guide rods are fixedly connected to the four corners of the top of the inner wall of the mounting frame. The bottom of the guide rods is fixedly connected to the bottom of the inner wall of the mounting frame. Movable plates are movably connected to the outer walls of the four guide rods. The bottom of the movable plates is provided with mounting grooves. A rectangular through hole extending to the outside is provided at the bottom of the inner wall of the mounting frame.

[0008] Preferably, a fixing groove is provided on both the front and rear sides of the rectangular through hole and the inner wall of the mounting groove, a motor groove is provided on the right side of the movable plate and the lower right side of the mounting frame, and a circular movable hole is provided on the left side of the inner wall of the motor groove, extending through to the interior of the rear fixing groove.

[0009] Preferably, rectangular blocks are fixedly connected to the left and right sides of the bottom front side of the mounting frame, and mounting platforms are fixedly connected to the bottom of the two rectangular blocks. A second fixing groove is opened on the top of the mounting platform, and a third fixing groove is opened on the left side of the mounting platform. A circular through hole extending to the outside is opened on the top of the inner wall of the third fixing groove. A connecting plate is fixedly connected to the top rear side of the mounting platform, and a fixing plate is fixedly connected to the front upper side of the connecting plate. The front side of the fixing plate is fixedly connected to the lower rear side of the mounting frame. A second circular movable hole extending to the outside is opened on the top of the inner wall of the mounting frame. A first hydraulic push rod is fixedly connected to the top of the mounting frame, and the output end of the first hydraulic push rod is fixedly connected to the top of the movable plate.

[0010] Preferably, the fixing structure includes a stepper motor, a rotating shaft fixedly connected to the left end of the stepper motor, a bidirectional threaded rod fixedly connected to the left end of the rotating shaft, a support sleeve movably connected to the middle position of the outer wall of the bidirectional threaded rod, two symmetrical sliders threadedly connected to the outer wall of the bidirectional threaded rod, a fixing groove fixedly connected to the front side of the sliders, an electromagnetic block fixedly connected to the inner wall of the fixing groove, an upper mold movably connected to the side of the two electromagnetic blocks that are close to each other, a sliding sleeve fixedly connected to the front side of the fixing groove, a sliding rod movably connected to the inner wall of the sliding sleeve, and a fixing block fixedly connected to the end of the two sliding rods that are close to each other.

[0011] Preferably, the outer wall of the first stepper motor is fixedly connected to the inner wall of the rear motor slot, the outer wall of the rotating shaft is movably connected to the inner wall of the first circular movable hole, the left end of the bidirectional threaded rod is rotatably connected to the inner wall of the rear motor slot, the outer wall of the fixed block is fixedly connected to the inner wall of the front motor slot, and the ends of the two sliding rods that are far apart from each other are fixedly connected to the inner wall of the front motor slot.

[0012] Preferably, the mold changing structure includes a cross-shaped rotating plate. The top of the cross-shaped rotating plate has a circular fixing hole extending to the bottom. A fixing post is fixedly connected to the inner wall of the circular fixing hole. A limit post is fixedly connected to the bottom of the fixing post. A turntable is fixedly connected to the bottom of the limit post. A gear is fixedly connected to the top of the turntable. A gear is meshed with the outer wall of the gear. A stepper motor is fixedly connected to the end of the gear away from the limit post. The outer wall of the limit post is movably connected to the inner wall of the circular through hole. The top of the fixing post is rotatably connected to the bottom of the fixing plate. The bottom of the turntable is rotatably connected to the inner wall of the fixing groove. The bottom of the stepper motor is fixedly connected to the inner wall of the fixing groove.

[0013] Preferably, mold storage slots are fixedly connected to all four sides of the cross-shaped rotating plate away from the fixed column. A lifting plate is movably connected to the inner wall of the mold storage slot. A lower mold is movably connected to the top of the lifting plate. The top of the lower mold is movably connected to the bottom of the upper mold. A rectangular through hole 2 extending to the outer wall is opened at the bottom of the inner wall of the mold storage slot. A top plate is movably connected to the bottom of the lifting plate. The outer wall of the top plate is movably connected to the inner wall of the rectangular through hole 2. A hydraulic push rod 2 is fixedly connected to the bottom of the top plate. The outer wall of the hydraulic push rod 2 is fixedly connected to the inner wall of the fixed slot 2.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. The fixed structure makes the installation and disassembly of the upper and lower molds more convenient, thereby improving the efficiency of mold replacement. Furthermore, the electromagnetic blocks adsorb and fix the molds, increasing stability and making operation simple and quick.

[0016] 2. By incorporating a mold-changing structure, the mold-changing process becomes more efficient and highly automated, reducing the tedium of manual operation. The entire mold-changing process is smooth and fast, significantly improving production efficiency and flexibility. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic cross-sectional view of the mold-closing structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the fixing structure of this utility model;

[0020] Figure 4 This is a schematic cross-sectional view of the mold-changing structure of this utility model.

[0021] In the diagram: 1. Mold closing structure; 2. Fixing structure; 3. Mold changing structure; 4. Injection mechanism; 11. Mounting frame; 12. Guide rod; 13. Movable plate; 14. Mounting slot; 15. Rectangular through hole one; 16. Fixing slot one; 17. Motor slot; 18. Rectangular block; 19. Mounting platform; 10. Fixing slot two; 101. Fixing slot three; 102. Circular through hole; 103. Connecting plate; 104. Fixing plate; 105. Hydraulic push rod one; 21. Stepper motor one; 22. Rotating shaft ; 23. Bidirectional threaded rod; 24. Support sleeve; 25. Slider; 26. Fixed groove; 27. Electromagnetic block; 28. Upper mold; 29. ​​Sliding sleeve; 20. Sliding rod; 201. Fixed block; 31. Cross rotating plate; 32. Fixed column; 33. Limiting column; 34. Turntable; 35. Gear plate; 36. Gear; 37. Stepper motor II; 38. Mold storage groove; 39. Lifting plate; 30. Lower mold; 301. Rectangular through hole II; 302. Top plate; 303. Hydraulic push rod II. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-2This utility model provides a technical solution: a quick mold changing device for an EVA injection molding machine, including a mold closing structure 1. Fixing structures 2 are provided on both the upper and lower sides inside the mold closing structure 1. A mold changing structure 3 is provided on the rear side inside the mold closing structure 1. An injection mechanism 4 is provided on the rear top side of the mold closing structure 1. The mold closing structure 1 includes a mounting frame 11. Guide rods 12 are fixedly connected to the four corners of the top of the inner wall of the mounting frame 11. The bottom of the guide rods 12 is fixedly connected to the bottom of the inner wall of the mounting frame 11. Movable plates 13 are movably connected to the outer walls of the four guide rods 12. A mounting groove 14 is provided at the bottom of the movable plate 13. A rectangular through hole 15 extending to the outside is provided at the bottom of the inner wall of the mounting frame 11. Fixing grooves 16 are provided on both the front and rear sides of the rectangular through hole 15 and the inner wall of the mounting groove 14. A motor groove 17 is provided on the right side of the movable plate 13 and the lower right side of the mounting frame 11. A circular movable hole 1, penetrating to the interior of the rear fixed groove 16, is provided on the left side of the inner wall of the machine slot 17. Rectangular blocks 18 are fixedly connected to the left and right sides of the bottom front side of the mounting frame 11. A mounting platform 19 is fixedly connected to the bottom of the two rectangular blocks 18. A fixed groove 2 10 is provided on the top of the mounting platform 19. A fixed groove 3 101 is provided on the left side of the mounting platform 19. A circular through hole 102, penetrating to the outside, is provided on the top top rear side of the mounting platform 19. A fixed plate 104 is fixedly connected to the front upper side of the connecting plate 103. The front side of the fixed plate 104 is fixedly connected to the rear lower side of the mounting frame 11. A circular movable hole 2, penetrating to the outside, is provided on the top of the mounting frame 11. A hydraulic push rod 105 is fixedly connected to the top of the mounting frame 11. The output end of the hydraulic push rod 105 is fixedly connected to the top of the movable plate 13.

[0024] Please see Figure 3The fixed structure 2 includes a stepper motor 21. A rotating shaft 22 is fixedly connected to the left end of the stepper motor 21. A bidirectional threaded rod 23 is fixedly connected to the left end of the rotating shaft 22. A support sleeve 24 is movably connected to the middle position of the outer wall of the bidirectional threaded rod 23. Two symmetrical sliders 25 are threadedly connected to the outer wall of the bidirectional threaded rod 23. A fixed groove 26 is fixedly connected to the front side of the sliders 25. An electromagnetic block 27 is fixedly connected to the inner wall of the fixed groove 26. An upper mold is movably connected to the side of the two electromagnetic blocks 27 that are close to each other. The front side of the fixed groove 26 is fixedly connected to a sliding sleeve 29. A sliding rod 20 is movably connected to the inner wall of the sliding sleeve 29. A fixing block 201 is fixedly connected to one end of each sliding rod 20 that is close to the other. The outer wall of the stepper motor 21 is fixedly connected to the inner wall of the rear motor groove 17. The outer wall of the rotating shaft 22 is movably connected to the inner wall of the circular movable hole 1. The left end of the bidirectional threaded rod 23 is rotatably connected to the inner wall of the rear motor groove 17. The outer wall of the fixing block 201 is fixedly connected to the inner wall of the front motor groove 17. The two sliding rods... One end of rod 20 that is far apart from each other is fixedly connected to the inner wall of the front motor slot 17. When the mold needs to be replaced, firstly, the hydraulic push rod 105 is activated, so that the upper fixed structure 2 drives the upper mold 28 to stop on the top of the lower mold 30. Then, the electromagnetic block 27 is turned off to stop the adsorption of the upper mold 28 and the lower mold 30. Then, the stepper motor 21 in the upper and lower fixed structures 2 is activated, which drives the rotating shaft 22 to rotate. The rotating shaft 22 drives the bidirectional threaded rod 23 to rotate. The rotation of the bidirectional threaded rod 23 causes the two sliders 25 to move away from each other or move closer together. When the sliders 25 move away from each other, the fixed slot 26 and the electromagnetic block 27 will be disengaged from the outer wall of the upper mold 28 and the lower mold 30, thereby releasing the upper mold 28 and the lower mold 30 from fixation. Then, the structure in the mold changing structure 3 is activated to switch the mold. Then, the two stepper motors 21 are activated in reverse to fix the upper mold 28 and the lower mold 30, thus completing the mold replacement.

[0025] Please see Figure 4The mold changing structure 3 includes a cross-shaped rotating plate 31. A circular fixing hole extending from the top to the bottom of the cross-shaped rotating plate 31 is provided. A fixing post 32 is fixedly connected to the inner wall of the circular fixing hole. A limit post 33 is fixedly connected to the bottom of the fixing post 32. A turntable 34 is fixedly connected to the bottom of the limit post 33. A gear 35 is fixedly connected to the top of the turntable 34. A gear 36 is meshed with the outer wall of the gear 35. A stepper motor 37 is fixedly connected to the end of the gear 36 away from the limit post 33. The outer wall of the limit post 33 is movably connected to the inner wall of the circular through hole 102. The top of the fixing post 32 is rotatably connected to the bottom of the fixing plate 104. The bottom of the turntable 34 is rotatably connected to the inner wall of the fixing groove 101. The bottom of the stepper motor 37 is rotatably connected to the inner wall of the fixing groove 101. A fixed connection is established, with mold storage slots 38 fixedly connected to all four sides of the cross-shaped rotating plate 31 away from the fixed column 32. A lifting plate 39 is movably connected to the inner wall of the mold storage slot 38. A lower mold 30 is movably connected to the top of the lifting plate 39. The top of the lower mold 30 is movably connected to the bottom of the upper mold 28. A rectangular through hole 301 extending to the outer wall is opened at the bottom of the inner wall of the mold storage slot 38. A top plate 302 is movably connected to the bottom of the lifting plate 39. The outer wall of the top plate 302 is movably connected to the inner wall of the rectangular through hole 301. A hydraulic push rod 303 is fixedly connected to the bottom of the top plate 302. The outer wall of the hydraulic push rod 303 is fixedly connected to the inner wall of the fixed slot 10. The upper mold 28 is located on top of the lower mold 30, and the two fixed structures on the upper and lower sides are further defined. When fixing the upper mold 28 and the lower mold 30, the hydraulic push rod 303 is activated, causing the top plate 302 to descend. This descent of the top plate 302 drives the lifting plate 39 and the lower mold 30 and upper mold 28 on top of the lifting plate 39 to descend as well. When the top plate 302 moves through the rectangular through hole 301 to the outside of the mold storage slot 38, the lower mold 30 and upper mold 28 are completely inside the mold storage slot 38, and the lifting plate 39 is at the bottom of the mold storage slot 38. Then, the stepper motor 37 is activated, causing the gear 36 to rotate. The gear 36 then drives the gear plate 35 to rotate, which in turn drives the limiting post 33, turntable 34, fixing post 32, and cross plate 31 to rotate. The rotating plate 31 rotates, causing the four mold storage slots 38 to rotate as well, thus moving the mold to be used to the front. Then, the hydraulic push rod 303 is activated again, causing the top plate 302 to lift the lifting plate 39, the lower mold 30, and the upper mold 28. When the lifting plate 39, the lower mold 30, and the upper mold 28 move to the outside of the mold storage slots 38, the outer walls of the lower mold 30 and the upper mold 28 come into contact with the inner wall of the mold closing structure 1. Then, the stepper motor 21 in the upper and lower fixing structures 2 is activated again, causing the fixing slot 26 and the electromagnetic block 27 to clamp the upper mold 28 and the lower mold 30. Then, the electromagnetic block 27 is activated to attract the upper mold 28 and the lower mold 30, thus completing the mold replacement and positioning.This significantly improves the efficiency of mold replacement and reduces the safety hazards associated with manual mold replacement, making it safer and more convenient.

[0026] Working principle:

[0027] When the mold needs to be replaced, firstly, start the hydraulic push rod 105, so that the upper fixed structure 2 drives the upper mold 28 to stop on the top of the lower mold 30. Then, turn off the electromagnetic block 27 to stop the attraction of the upper mold 28 and the lower mold 30. Then, start the stepper motor 21 in the upper and lower fixed structures 2, so that the stepper motor 21 drives the rotating shaft 22 to rotate. The rotating shaft 22 drives the bidirectional threaded rod 23 to rotate. The rotation of the bidirectional threaded rod 23 causes the two sliders 25 to move away from each other or move closer to each other. When the sliders 25 move away from each other, the fixed groove 26 and the electromagnetic block 27 will be disengaged from the outer wall of the upper mold 28 and the lower mold 30, thereby releasing the upper mold 28 and the lower mold 30 from fixation. Then, by starting the structure in the mold changing structure 3, the mold is switched. Then, by starting the two stepper motors 21 in reverse, the upper mold 28 and the lower mold 30 are fixed, thus completing the mold replacement.

[0028] When the upper mold 28 is on top of the lower mold 30, and the fixing structures 2 on both sides are released from fixing the upper mold 28 and the lower mold 30, the hydraulic push rod 303 is activated, causing the top plate 302 to descend. The descent of the top plate 302 causes the lifting plate 39 and the lower mold 30 and upper mold 28 on top of the lifting plate 39 to descend. When the top plate 302 moves through the rectangular through hole 301 to the outside of the mold storage slot 38, the lower mold 30 and upper mold 28 are completely inside the mold storage slot 38, and the lifting plate 39 is at the bottom inside the mold storage slot 38. Then, the stepper motor 37 is activated, causing the gear 36 to rotate. The gear 36 then drives the gear plate 35 to rotate. The rotation of the gear plate 35 causes the limiting post 33, turntable 34, fixing post 32, and cross plate 31 to rotate. The rotation of the cross plate 31 then drives... The four mold storage slots 38 rotate, thereby moving the mold to be used to the front. Then, the hydraulic push rod 303 is activated again, causing the top plate 302 to lift the lifting plate 39, the lower mold 30, and the upper mold 28. When the lifting plate 39, the lower mold 30, and the upper mold 28 move to the outside of the mold storage slots 38, the outer walls of the lower mold 30 and the upper mold 28 come into contact with the inner wall of the mold closing structure 1. Then, the stepper motor 21 in the upper and lower fixing structures 2 is activated again, driving the fixing slot 26 and the electromagnetic block 27 to clamp the upper mold 28 and the lower mold 30. Then, the electromagnetic block 27 is activated to attract the upper mold 28 and the lower mold 30, thus completing the mold replacement and positioning. This greatly improves the efficiency of mold replacement and reduces the safety hazards caused by manual mold replacement, making mold replacement safer and more convenient.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A quick mold change device for an EVA injection molding machine, characterized by: Including the die structure (1), the upper and lower two parties of the die structure (1) inside are provided with fixed structure (2), the inside rear side of the die structure (1) is provided with die changing structure (3), the top rear side of the die structure (1) is provided with injection mechanism (4); The mounting frame (11) is internally provided with four guide rods (12) fixedly connected to the four corners of the top of the inner wall, the bottom of the guide rod (12) is fixedly connected to the inner wall bottom of the mounting frame (11), the outer wall of the four guide rods (12) is movably connected with an activity board (13), the bottom of the activity board (13) is provided with a mounting groove (14), and the inner wall bottom of the mounting frame (11) is provided with a rectangular through hole (15) penetrating to the outside.

2. The quick mold change device of an EVA injection molding machine according to claim 1, wherein: The front and rear sides of the inner wall of the rectangular through hole (15) and the mounting groove (14) are provided with a fixed groove (16), the right side of the activity board (13) and the right side of the lower side of the mounting frame (11) are provided with a motor groove (17), and the inner wall left side of the motor groove (17) is provided with a circular movable hole (1) penetrating to the inside of the rear fixed groove (16).

3. The quick mold change device of an EVA injection molding machine according to claim 2, wherein: The left and right sides of the bottom front side of the mounting frame (11) are fixedly connected with a rectangular block (18), the bottom of the two rectangular blocks (18) is fixedly connected with a mounting table (19), the top of the mounting table (19) is provided with a fixed groove (10), the left side of the mounting table (19) is provided with a fixed groove (101), the inner wall top of the fixed groove (101) is provided with a circular through hole (102) penetrating to the outside, the top rear side of the mounting table (19) is fixedly connected with a connecting plate (103), the front side upper side of the connecting plate (103) is fixedly connected with a fixed plate (104), the front side of the fixed plate (104) is fixedly connected with the rear lower side of the mounting frame (11), the inner wall top of the mounting frame (11) is provided with a circular movable hole (2) penetrating to the outside, and the top of the mounting frame (11) is fixedly connected with a hydraulic push rod (105), and the output end of the hydraulic push rod (105) is fixedly connected with the top of the activity board (13).

4. The quick mold change device for an EVA injection molding machine according to claim 1, wherein: The fixed structure (2) comprises a step motor (21), the left end of the step motor (21) is fixedly connected with a rotating shaft (22), the left end of the rotating shaft (22) is fixedly connected with a bidirectional threaded rod (23), the outer wall of the bidirectional threaded rod (23) is movably connected with a support sleeve (24) at the middle position, the outer wall of the bidirectional threaded rod (23) is threadedly connected with two symmetrical sliding blocks (25), the front side of the sliding block (25) is fixedly connected with a fixed groove (26), the inner wall of the fixed groove (26) is fixedly connected with an electromagnetic block (27), the side of the two electromagnetic blocks (27) close to each other is movably connected with an upper die (28), the front side of the fixed groove (26) is fixedly connected with a sliding sleeve (29), the inner wall of the sliding sleeve (29) is movably connected with a sliding rod (20), and the end of the two sliding rods (20) close to each other is fixedly connected with a fixed block (201).

5. The quick mold change device for an EVA injection molding machine according to claim 4, wherein: The outer wall of the step motor one (21) is fixedly connected with the inner wall of the rear motor groove (17), the outer wall of the rotating shaft (22) is movably connected with the inner wall of the circular movable hole one, the left end of the bidirectional threaded rod (23) is rotatably connected with the inner wall of the rear motor groove (17), the outer wall of the fixed block (201) is fixedly connected with the inner wall of the front motor groove (17), and the mutually faraway ends of the two slide rods (20) are fixedly connected with the inner wall of the front motor groove (17).

6. The quick mold change device for an EVA injection molding machine according to claim 1, wherein: The die changing structure (3) comprises a cross turning plate (31), a circular fixing hole penetrating through the top to the bottom is formed in the top of the cross turning plate (31), a fixed column (32) is fixedly connected with the inner wall of the circular fixing hole, a limiting column (33) is fixedly connected with the bottom of the fixed column (32), a rotating disc (34) is fixedly connected with the bottom of the limiting column (33), a toothed disc (35) is fixedly connected with the top of the rotating disc (34), a gear (36) is meshingly connected with the outer wall of the toothed disc (35), a step motor two (37) is fixedly connected with the end, away from the limiting column (33), of the gear (36), the outer wall of the limiting column (33) is movably connected with the inner wall of the circular through hole (102), the top of the fixed column (32) is rotatably connected with the bottom of the fixed plate (104), the bottom of the rotating disc (34) is rotatably connected with the inner wall of the fixed groove three (101), and the bottom of the step motor two (37) is fixedly connected with the inner wall of the fixed groove three (101).

7. The quick mold change device of an EVA injection molding machine according to claim 6, wherein: The cross turning plate (31) is fixedly connected with a die storage groove (38) away from the four sides of the fixed column (32), the inner wall of the die storage groove (38) is movably connected with a lifting plate (39), the top of the lifting plate (39) is movably connected with a lower die (30), the top of the lower die (30) is movably connected with the bottom of an upper die (28), the inner wall bottom of the die storage groove (38) is provided with a rectangular through hole two (301) penetrating through to the outer wall, the bottom of the lifting plate (39) is movably connected with a top plate (302), the outer wall of the top plate (302) is movably connected with the inner wall of the rectangular through hole two (301), and the bottom of the top plate (302) is fixedly connected with a hydraulic push rod two (303).

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