Injection molding machine with defect detection function for plastic film production

Abstract

The invention relates to the technical field of defect detection, in particular to a plastic film production injection molding machine with a defect detection function, which comprises a main frame, a vertical injection molding machine main body is fixedly mounted at the bottom of the inner side of the main frame, a transfer manipulator is arranged at the top of the inner side of the main frame, and a main frame body is fixedly mounted at the transfer end of the bottom of the transfer manipulator; a cooling box is welded to the side wall of the main frame body, a plurality of air outlet holes are formed in the bottom of the inner side of the cooling box at equal intervals, two second racks are arranged at the top of the cooling box in a sliding mode, piston plates are welded to the bottoms of the two second racks, and the piston plates moving downwards push air to flow out through the air outlet holes, so that the surface of the colloid is cooled; the piston plate moves downwards to push the gas in the cavity to move downwards integrally, so that the gas can be uniformly discharged through a plurality of gas outlet holes, and the uniformity of heat dissipation of the surface of the colloid is enhanced to a certain extent.

Description

Technical Field

[0001] The present invention relates to the technical field of defect detection, and particularly to an injection molding machine for plastic film production with a defect detection function. Background Art

[0002] Using the main body of a vertical injection molding machine for the encapsulation operation of metal pipe fittings is an efficient and precise manufacturing process. It fixes the metal pipe fittings as inserts in the lower mold through a vertical mold structure, and injects molten plastic material into the cavity using a plunger or a screw. Under high temperature and high pressure environment, a tight bond is formed between the plastic and the metal surface. Due to factors such as material fluidity, mold design, and process parameter fluctuations during the manufacturing process of the metal pipe fitting encapsulation process, it is very easy to have the problem of uneven thickness of the encapsulation layer, resulting in a decline in the product's sealing performance, corrosion resistance, and mechanical properties. In severe cases, it may cause safety hazards. Currently, the industry generally uses manual random sampling for quality control, measuring the thickness of the encapsulation layer batch by batch with a vernier caliper or a micrometer. However, this method has defects such as low detection efficiency, strong subjectivity, and scattered data recording, and it is difficult to cover the real-time monitoring requirements of the entire production cycle. Moreover, manual operation is affected by factors such as fatigue and experience differences, with a high missed inspection rate, and it cannot effectively identify small size deviations, resulting in batch quality problems occurring frequently, which restricts the improvement of production efficiency and product consistency. Therefore, the present invention provides an injection molding machine for plastic film production with a defect detection function. Summary of the Invention

[0003] The purpose of the present invention is to provide an injection molding machine for plastic film production with a defect detection function to solve the problems raised in the above background art.

[0004] The technical solution of the present invention is: an injection molding machine for plastic film production with a defect detection function, including a main frame. At the bottom inside the main frame, a vertical injection molding machine body is fixedly installed. At the top inside the main frame, a transfer manipulator is provided. At the transfer end of the bottom of the transfer manipulator, a main frame body is fixedly installed. A cooling box is welded on the side wall of the main frame body. A number of air outlet holes are equidistantly arranged at the bottom inside the cooling box. Two rack bars II are slidably arranged at the top of the cooling box. Piston plates are welded to the bottoms of the two rack bars II. Two air inlet holes are respectively opened through the tops of the two piston plates. Two slide bars are slidably arranged between the side walls at both ends of the cooling box. A movable plate is welded between the two slide bars. Circular plates are welded to the side walls at both ends of the two slide bars. Springs are wound around the outer peripheral walls of the two slide bars, and the four springs are respectively connected between the corresponding circular plates and the side walls of the cooling box. An installation frame is welded between every two adjacent circular plates. A rotating rod is rotatably connected between the side walls at both ends of the two installation frames. Air bags are fixedly sleeved on the outer peripheral walls of the two rotating rods. Adhesive papers are fixedly sleeved on the outer peripheral walls of the two air bags. The downward-moving piston plate pushes the gas to gush out through the air outlet holes to dissipate heat and cool the surface of the colloid. Since the downward movement of the piston plate will push the gas in the chamber to move downward as a whole, the gas can be evenly discharged through a number of air outlet holes, which enhances the uniformity of heat dissipation on the surface of the colloid to a certain extent.

[0005] Preferably, a vertical plate is welded to the top of the cooling box. A variable-frequency motor is fixedly installed on the side wall of the vertical plate. The output end of the variable-frequency motor is fixedly installed with a gear II that is meshed with both rack bars II. The provided variable-frequency motor drives the gear II to rotate.

[0006] Preferably, two electric push rods are fixedly installed on the inner side wall of the main frame body. A ring body is rotatably connected between the telescopic ends of the two electric push rods. Two symmetrical rack bars I are welded to the side of the ring body away from the electric push rods.

[0007] Preferably, a gear ring is rotatably connected to the inner side wall of the main frame body. Two symmetrical installation frames are welded to the inner circular surface of the gear ring. A bidirectional lead screw is rotatably connected between the side walls of the two installation frames. Two gears I that are meshed with the corresponding rack bars I are welded to the outer peripheral wall of the bidirectional lead screw. The two rack bars I are respectively slidably arranged on the side walls of the corresponding installation frames. Two symmetrical displacement plates are threadedly connected to the outer peripheral wall of the bidirectional lead screw. Arc-shaped clamping plates are welded to the sides of the two displacement plates close to each other. The electric push rod drives the ring body and the rack bar I to move. Since the rack bar I is meshed with the gear I, the moving rack bar I will drive the gear I and the bidirectional lead screw to rotate during the movement. As the bidirectional lead screw rotates, the two symmetrical displacement plates respectively drive the arc-shaped clamping plates welded thereto to clamp the uncoated area of the metal pipe fitting, thereby completing the clamping and fixing of the metal pipe fitting.

[0008] Preferably, a limiting rod is welded between the two mounting frames, and the two displacement plates are both slidably arranged on the outer peripheral wall of the limiting rod. The arranged limiting rod limits and constrains the displacement plates during the movement process.

[0009] Preferably, a driving motor is fixedly installed on the inner side wall of the main frame body, and a driving gear meshing with the gear ring is fixedly installed at the output end of the driving motor. The arranged driving motor drives the driving gear to rotate.

[0010] Preferably, a support rod is welded on the side wall of the cooling box, and an infrared thermal imager is fixedly installed on the side wall of the support rod. After running for a set time, the device stops the heat dissipation operation of the colloid, and at the same time, the driving motor drives the colloid to rotate slowly. The arranged infrared thermal imager detects whether there are temperature abnormal points on the surface of the colloid. If there are temperature abnormal points, it proves that the thickness of the colloid in this area is uneven.

[0011] Preferably, the bottom of the cooling box is arc-shaped, and the airflow pushed by the piston plate flows along the gap between the arc-shaped bottom of the cooling box and the top of the colloid to both sides.

[0012] The present invention provides an injection molding machine for plastic film production with a defect detection function through improvement. Compared with the prior art, it has the following improvements and advantages:

[0013] 1. The downward moving piston plate pushes the gas to gush out through the air outlet holes to dissipate heat and cool the surface of the colloid. Since the downward movement of the piston plate will push the gas in the chamber to move downward as a whole, the gas can be discharged evenly through a plurality of air outlet holes, which enhances the uniformity of heat dissipation on the surface of the colloid to a certain extent;

[0014] 2. The second rack on the left moves upward to reset, and the second rack on the right moves downward to push the gas to flow for heat dissipation operation. The two second racks operate alternately in sequence to realize continuous heat dissipation operation of the colloid;

[0015] 3. The sequential and alternating reciprocating movement of the two second racks will drive the sliding rod to move left and right reciprocally. The arranged sliding rod drives the two sticky papers symmetrically arranged to move left and right reciprocally, so that the two sticky papers alternately abut against the surface of the colloid, thereby realizing the adsorption of the oily substances on the surface of the colloid and reducing its influence on the subsequent detection operation;

[0016] 4. Since the sticky paper is fixedly sleeved on the outer peripheral wall of the airbag, during the process of the sticky paper abutting against the surface of the colloid, the arranged airbag is compressed by force, and the contact area and force between the sticky paper and the surface of the colloid are both increased, which enhances the adsorption effect of the sticky paper on the oily substances to a certain extent;

[0017] 5. When the left sticky paper contacts the outer surface of the colloid, the airflow pushed by the piston plate carries the heat on the surface of the colloid and blows it towards the area where the left sticky paper is about to contact the colloid, appropriately heating it to enhance the adsorption effect of the sticky paper on the oily substance; at the same time, the airflow pushed by the piston plate will also blow towards the area where the right sticky paper is closest to the colloid, thereby preheating for subsequent cleaning operations. Brief Description of the Drawings

[0018] The present invention will be further explained below in conjunction with the drawings and embodiments:

[0019] Figure 1 is a schematic three-dimensional structure diagram of the present invention;

[0020] Figure 2 is a schematic main frame structure diagram of the present invention;

[0021] Figure 3 is a schematic ring body structure diagram of the present invention;

[0022] Figure 4 is a schematic gear ring structure diagram of the present invention;

[0023] Figure 5 is a schematic cooling box structure diagram of the present invention;

[0024] Figure 6 is a schematic inner cavity structure diagram of the cooling box of the present invention;

[0025] Figure 7 is a schematic airbag structure diagram of the present invention;

[0026] Figure 8 is a schematic air outlet structure diagram of the present invention;

[0027] Figure 9 is a schematic piston plate structure diagram of the present invention;

[0028] Figure 10 is a schematic movable plate structure diagram of the present invention;

[0029] Figure 11 is the present invention Figure 10 amplified schematic diagram of the structure of part A.

[0030] Explanation of Reference Numerals in the Drawings:

[0031] 1. Main frame; 2. Main body of vertical injection molding machine; 3. Transfer manipulator; 4. Main frame body; 5. Cooling box; 6. Air outlet; 7. Rack two; 8. Piston plate; 9. Slide bar; 10. Movable plate; 11. Circular plate; 12. Spring; 13. Mounting frame; 14. Rotating rod; 15. Airbag; 16. Adhesive paper; 17. Vertical plate; 18. Variable frequency motor; 19. Gear two; 20. Electric push rod; 21. Ring body; 22. Rack one; 23. Tooth ring; 24. Mounting frame; 25. Bi-directional lead screw; 26. Gear one; 27. Displacement plate; 28. Arc-shaped clamping plate; 29. Limit rod; 30. Driving motor; 31. Driving gear; 32. Support rod; 33. Infrared thermal imager; 34. Air inlet; 35. Metal pipe fitting; 36. Colloid. Detailed implementation mode

[0032] The present invention will be described in detail below. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0033] The present invention provides an injection molding machine for plastic film production with a defect detection function by improvement. The technical solution of the present invention is as follows:

[0034] Such as Figures 1 - 11As shown in the figure, an injection molding machine for plastic film production with a defect detection function includes a main frame 1. At the bottom inside the main frame 1, a vertical injection molding machine body 2 is fixedly installed. At the top inside the main frame 1, a transfer manipulator 3 is arranged. At the bottom transfer end of the transfer manipulator 3, a main frame body 4 is fixedly installed. On the inner side wall of the main frame body 4, two electric push rods 20 are fixedly installed. Between the telescopic ends of the two electric push rods 20, a ring body 21 is rotatably connected. On the side of the ring body 21 away from the electric push rod 20, two symmetric rack one 22 are welded. The inner side wall of the main frame body 4 is rotatably connected with a gear ring 23. On the inner circular surface of the gear ring 23, two symmetric mounting frames 24 are welded. Between the side walls of the two mounting frames 24, a bidirectional lead screw 25 is rotatably connected. On the outer peripheral wall of the bidirectional lead screw 25, two gears one 26 meshing with the corresponding rack one 22 are welded. And the two rack one 22 are respectively slidably arranged on the side walls of the corresponding mounting frames 24. On the outer peripheral wall of the bidirectional lead screw 25, two symmetric displacement plates 27 are threadedly connected. On the side of the two displacement plates 27 close to each other, an arc-shaped clamping plate 28 is welded. When in use, after the vertical injection molding machine body 2 completes the encapsulation process of the metal pipe fitting 35, the set transfer manipulator 3 moves to the unencapsulated end of the metal pipe fitting 35. Subsequently, the set electric push rod 20 drives the ring body 21 and the rack one 22 to move. Since the rack one 22 meshes with the gear one 26, the moving rack one 22 will drive the gear one 26 and the bidirectional lead screw 25 to rotate. With the rotation of the bidirectional lead screw 25, the two symmetric displacement plates 27 drive the arc-shaped clamping plates 28 welded to them to clamp on the unencapsulated area of the metal pipe fitting 35, thereby completing the clamping and fixing of the metal pipe fitting 35. Among them, a limiting rod 29 is welded between the two mounting frames 24, and the two displacement plates 27 are both slidably arranged on the outer peripheral wall of the limiting rod 29. The set limiting rod 29 limits and restricts the displacement plates 27 during the moving process.

[0035] Further, a cooling box 5 is welded on the side wall of the main frame body 4. On the bottom inside the cooling box 5, a number of air outlet holes 6 are equally spaced. On the top of the cooling box 5, two rack two 7 are slidably arranged. On the top of the cooling box 5, a vertical plate 17 is welded. On the side wall of the vertical plate 17, a variable frequency motor 18 is fixedly installed. The output end of the variable frequency motor 18 is fixedly installed with a gear two 19 meshing with both of the two rack two 7. At the bottom of the two rack two 7, piston plates 8 are welded. On the top of the two piston plates 8, two air inlet holes 34 are respectively opened. Between the two side walls of the cooling box 5, two sliding rods 9 are slidably arranged. Between the two sliding rods 9, a movable plate 10 is welded. On the side walls at both ends of the two sliding rods 9, circular plates 11 are welded. On the outer peripheral walls of the two sliding rods 9, springs 12 are wound, and the four springs 12 are respectively connected between the corresponding circular plates 11 and the side wall of the cooling box 5. During the process of the transfer manipulator 3 transferring the metal pipe fitting 35, the set variable frequency motor 18 intermittently drives the gear two 19 to perform forward and reverse rotation movements. The set gear two 19 intermittently drives the two rack two 7 to move up and down alternately. As Figure 6 andFigure 7 As shown, during the above process, the downward movement of the left rack two 7 drives the downward movement of the left piston plate 8. The downward movement of the left piston plate 8 pushes the movable plate 10 and the slide bar 9 to move to the right, causing the air outlet 6 to leak out. The downward-moving piston plate 8 pushes the gas to gush out through the air outlet 6, so as to dissipate heat and cool the surface of the colloid 36; since the downward movement of the piston plate 8 pushes the gas in the chamber to move downward as a whole, the gas can be evenly discharged through a plurality of air outlets 6, which enhances the uniformity of heat dissipation on the surface of the colloid 36 to a certain extent; then the left rack two 7 moves upward to reset, and the right rack two 7 moves downward to push the gas to flow for heat dissipation operation. The two racks two 7 operate alternately in sequence to achieve continuous heat dissipation operation of the colloid 36; it should be noted that a one-way valve is provided inside the air inlet hole 34 formed through the top of the rack two 7. When the rack two 7 moves upward, the one-way valve provided is opened under the action of the air pressure difference, so that the external gas enters the chamber below the piston plate 8 through the air inlet hole 34, thereby ensuring that the piston plate 8 realizes continuous air outlet; in addition, a driving motor 30 is fixedly installed on the inner side wall of the main frame body 4, and a driving gear 31 meshing with the gear ring 23 is fixedly installed at the output end of the driving motor 30. During the above process, the driving motor 30 provided drives the driving gear 31 to rotate, and the driving gear 31 provided drives the gear ring 23, the mounting frame 24, the bidirectional lead screw 25, the displacement plate 27, the arc-shaped clamping plate 28, the metal pipe fitting 35 and the colloid 36 to rotate, which facilitates uniform heat dissipation of the outer surface of the colloid 36.

[0036] Furthermore, a support rod 32 is welded to the side wall of the cooling box 5, and an infrared thermal imager 33 is fixedly installed on the side wall of the support rod 32. After running for a set time, the device stops the heat dissipation operation of the colloid 36, and at the same time, the driving motor 30 drives the colloid 36 to rotate slowly. The set infrared thermal imager 33 detects whether there are temperature abnormal points on the surface of the colloid 36. If there are temperature abnormal points, it proves that the thickness of the colloid 36 in this area is uneven; An installation frame 13 is welded between every two adjacent circular plates 11, and a rotating rod 14 is rotatably connected between the side walls at both ends of the two installation frames 13. Air bags 15 are fixedly sleeved on the outer peripheral walls of the two rotating rods 14, and sticky papers 16 are fixedly sleeved on the outer peripheral walls of the two air bags 15. During the above process, the two racks two 7 will drive the sliding rod 9 to move left and right alternately in a reciprocating motion. The set sliding rod 9 drives the two symmetric sticky papers 16 to move left and right in a reciprocating motion, so that the two sticky papers 16 alternately abut against the surface of the colloid 36, thereby realizing the adsorption of the oily substances on the surface of the colloid 36 and reducing its impact on subsequent detection operations; In addition, since the sticky paper 16 is fixedly sleeved on the outer peripheral wall of the air bag 15, during the process of the sticky paper 16 abutting against the surface of the colloid 36, the set air bag 15 is compressed by force, and the contact area and force between the sticky paper 16 and the surface of the colloid 36 are both increased, which enhances the adsorption effect of the sticky paper 16 on the oily substances to a certain extent; In addition, since the colloid 36 continues to rotate under the action of the driving motor 30, when the sticky paper 16 cleans the outer surface of the colloid 36, the set sticky paper 16 will be automatically flipped under the action of the colloid 36.

[0037] Furthermore, the bottom of the cooling box 5 is arc-shaped. When the left sticky paper 16 contacts the outer surface of the colloid 36, the airflow pushed by the piston plate 8 carries the heat on the surface of the colloid 36 and blows it to the area where the left sticky paper 16 is about to contact the colloid 36, appropriately heating it and enhancing the adsorption effect of the sticky paper 16 on the oily substances; At the same time, the airflow pushed by the piston plate 8 will also blow to the area where the right sticky paper 16 is closest to the colloid 36, thereby preheating for subsequent cleaning operations.

[0038] Working principle: During use, after the vertical injection molding machine main body 2 completes the encapsulation process of the metal pipe fitting 35, the set transfer manipulator 3 moves to the unencapsulated end of the metal pipe fitting 35, and then the set electric push rod 20 drives the ring body 21 and the rack one 22 to move; Since the rack one 22 meshes with the gear one 26, the moving rack one 22 will drive the gear one 26 and the bidirectional lead screw 25 to rotate. As the bidirectional lead screw 25 rotates, the two symmetric displacement plates 27 each drive the arc-shaped clamping plates 28 welded to them to clamp the unencapsulated area of the metal pipe fitting 35, thereby completing the clamping and fixing of the metal pipe fitting 35.

[0039] During the process of the transfer manipulator 3 transferring the metal pipe fitting 35, the set variable-frequency motor 18 intermittently drives the second gear 19 to rotate forward and backward, and the set second gear 19 intermittently drives the two second racks 7 to move up and down alternately; as Figure 6 and Figure 7 shown, during the above process, the downward movement of the left second rack 7 drives the left piston plate 8 to move downward, and the downward movement of the left piston plate 8 pushes the movable plate 10 and the slide rod 9 to move to the right, so that the air outlet hole 6 leaks out, and the downward-moving piston plate 8 pushes the gas to gush out through the air outlet hole 6, so as to dissipate heat and cool the surface of the colloid 36; since the downward movement of the piston plate 8 pushes the gas in the chamber to move downward as a whole, the gas can be evenly discharged through the several air outlet holes 6, which to a certain extent enhances the uniformity of heat dissipation on the surface of the colloid 36; then the left second rack 7 moves up and resets, and the right second rack 7 moves downward to push the gas to flow for heat dissipation operation, and the two second racks 7 operate alternately in sequence to realize continuous heat dissipation operation on the colloid 36; it should be noted that a one-way valve is arranged inside the air inlet hole 34 formed through the top of the second rack 7. When the second rack 7 moves up, the set one-way valve is opened under the action of the air pressure difference, so that the external gas enters the chamber below the piston plate 8 through the air inlet hole 34, thereby ensuring that the piston plate 8 realizes continuous air outlet;

[0040] In the above process, the set driving motor 30 drives the driving gear 31 to rotate. The set driving gear 31 drives the gear ring 23, the mounting frame 24, the bidirectional lead screw 25, the displacement plate 27, the arc-shaped clamping plate 28, the metal pipe fitting 35 and the colloid 36 to rotate, which is convenient for uniformly dissipating heat from the outer surface of the colloid 36. After running for a set time, the device stops the heat dissipation operation of the colloid 36. At the same time, the driving motor 30 drives the colloid 36 to rotate slowly. The set infrared thermal imager 33 detects whether there are temperature abnormal points on the surface of the colloid 36. If there are temperature abnormal points, it proves that the thickness of the colloid 36 in this area is uneven. In the above process, the two second racks 7 alternately reciprocate in sequence to drive the slide bar 9 to reciprocate left and right. The set slide bar 9 drives the two symmetrically arranged sticky papers 16 to reciprocate left and right, so that the two sticky papers 16 alternately abut against the surface of the colloid 36, thereby realizing the adsorption of the oily substances on the surface of the colloid 36 and reducing its influence on the subsequent detection operation. In addition, since the sticky paper 16 is fixedly sleeved on the outer peripheral wall of the airbag 15, during the process of the sticky paper 16 abutting against the surface of the colloid 36, the set airbag 15 is compressed by force, and the contact area and force between the sticky paper 16 and the surface of the colloid 36 are both increased, which enhances the adsorption effect of the sticky paper 16 on the oily substances to a certain extent. Additionally, since the colloid 36 continuously rotates under the action of the driving motor 30, when the sticky paper 16 cleans the outer surface of the colloid 36, the set sticky paper 16 will be automatically flipped under the action of the colloid 36. Among them, when the left sticky paper 16 contacts the outer surface of the colloid 36, the airflow pushed by the piston plate 8 carries the heat on the surface of the colloid 36 and blows it to the area where the left sticky paper 16 is about to contact the colloid 36, appropriately heating it to enhance the adsorption effect of the sticky paper 16 on the oily substances. At the same time, the airflow pushed by the piston plate 8 will also blow to the area where the right sticky paper 16 is closest to the colloid 36, thereby preheating for the subsequent cleaning operation.

[0041] The above description enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An injection molding machine for plastic film production with a defect detection function, including a main frame (1), characterized in that: On the inner bottom of the main frame (1), a vertical injection molding machine body (2) is fixedly installed. On the inner top of the main frame (1), a transfer manipulator (3) is arranged. At the bottom transfer end of the transfer manipulator (3), a main frame body (4) is fixedly installed. A cooling box (5) is welded on the side wall of the main frame body (4). A number of air outlet holes (6) are equidistantly arranged on the inner bottom of the cooling box (5). Two racks two (7) are slidably arranged on the top of the cooling box (5). Piston plates (8) are welded to the bottoms of the two racks two (7). Two air inlet holes (34) are respectively formed through the tops of the two piston plates (8). Two sliding rods (9) are slidably arranged between the side walls at both ends of the cooling box (5). A movable plate (10) is welded between the two sliding rods (9). Circular plates (11) are welded to the side walls at both ends of the two sliding rods (9). Springs (12) are wound around the outer peripheral walls of the two sliding rods (9), and the four springs (12) are respectively connected between the corresponding circular plates (11) and the side wall of the cooling box (5). An installation frame (13) is welded between every two adjacent circular plates (11). A rotating rod (14) is rotatably connected between the side walls at both ends of the two installation frames (13). Air bags (15) are fixedly sleeved on the outer peripheral walls of the two rotating rods (14). Adhesive papers (16) are fixedly sleeved on the outer peripheral walls of the two air bags (15).

2. The injection molding machine for plastic film production with a defect detection function according to claim 1, characterized in that: A vertical plate (17) is welded on the top of the cooling box (5). A variable-frequency motor (18) is fixedly installed on the side wall of the vertical plate (17). The output end of the variable-frequency motor (18) is fixedly installed with a gear two (19) which is meshed with both of the two racks two (7).

3. An injection molding machine for plastic film production with a defect detection function according to claim 1, characterized in that: Two electric push rods (20) are fixedly installed on the inner side wall of the main frame body (4). A ring body (21) is rotatably connected between the telescopic ends of the two electric push rods (20). Two symmetrical racks one (22) are welded on the side of the ring body (21) away from the electric push rods (20).

4. An injection molding machine for plastic film production with a defect detection function according to claim 3, characterized in that: A gear ring (23) is rotatably connected to the inner side wall of the main frame body (4). Two symmetrical installation frames (24) are welded on the inner circular surface of the gear ring (23). A bidirectional lead screw (25) is rotatably connected between the side walls of the two installation frames (24). Two gears one (26) which are meshed with the corresponding racks one (22) are welded on the outer peripheral wall of the bidirectional lead screw (25), and the two racks one (22) are respectively slidably arranged on the side walls of the corresponding installation frames (24). Two symmetrical displacement plates (27) are threadedly connected to the outer peripheral wall of the bidirectional lead screw (25). Arc-shaped clamping plates (28) are welded on the sides of the two displacement plates (27) close to each other.

5. An injection molding machine for plastic film production with a defect detection function according to claim 4, characterized in that: A limiting rod (29) is welded between the two installation frames (24), and the two displacement plates (27) are both slidably arranged on the outer peripheral wall of the limiting rod (29).

6. An injection molding machine for plastic film production with a defect detection function according to claim 4, characterized in that: A driving motor (30) is fixedly installed on the inner side wall of the main frame body (4). The output end of the driving motor (30) is fixedly installed with a driving gear (31) which is meshed with the gear ring (23).

7. An injection molding machine for plastic film production with a defect detection function according to claim 1, characterized in that: A support rod (32) is welded on the side wall of the cooling box (5), and an infrared thermal imager (33) is fixedly installed on the side wall of the support rod (32).

8. An injection molding machine for plastic film production with a defect detection function according to claim 1, characterized in that: The bottom of the cooling box (5) is arc-shaped.

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