Protective film production device with tensile strength adjusting function

Abstract

The invention discloses a protective film production device with tensile strength adjustment, and relates to the field of protective film production.The protective film production device comprises a base, a connecting rod is fixedly connected to the upper end of the base, a supporting plate is fixedly connected to the upper end of the connecting rod, a sliding hole is formed in the supporting plate, and a sliding rod is slidably connected to the interior of the sliding hole; the lower end of the sliding rod is fixedly connected with a moving seat, a pressing roller is arranged at the lower end of the moving seat, and the middle of the upper end of the moving seat is fixedly connected with a threaded column; the device has the advantages that the height of the pressing roller can be adjusted through the rotating wheel, the rotating rod, the threaded sleeve, the threaded column, the sliding rod and other assemblies, then the tensile strength of a protective film can be adjusted, different production requirements are met, and meanwhile the adaptability of a product can be improved; the cutter can move circularly through the motor, the lead screw, the moving block, the guide block and other assemblies, then efficient cutting of the protective film can be achieved, manual intervention is effectively reduced, and meanwhile the production efficiency can be improved.

Description

Technical Field

[0001] This invention relates to the field of protective film production, and in particular to a protective film production apparatus with adjustable tensile strength. Background Technology

[0002] Protective film production equipment is a specialized industrial device for manufacturing various types of protective films. The protective films produced possess multiple key characteristics and applications. In terms of materials, common types include polyethylene (PE), polyvinyl chloride (PVC), and polyester (PET), each giving the protective film unique properties. PE protective films are soft, tough, and have strong adhesion; PET protective films, on the other hand, have high transparency, high strength, and heat resistance. During production, through precise process control, protective films can achieve different thicknesses, adhesion levels, and surface treatments. Uniform thickness ensures stable protective effects; adjustable adhesion allows for adaptation to different surface materials, such as smooth metals and rough boards, providing a firm bond while being easy to peel off without residue; the surface can be treated with antistatic and scratch-resistant agents. Protective films have a wide range of applications: in the electronics industry, they protect mobile phone and computer screens and casings from scratches during transportation and use; in the construction industry, they protect the surfaces of building materials such as glass and stone; in automobile manufacturing, they cover body parts to prevent damage during painting and assembly, providing comprehensive protection for the product and ensuring its quality and appearance.

[0003] However, in the existing technology, the tensile strength requirements of protective films vary significantly in different scenarios. For example, heavy-duty industrial protective films require high tear resistance, while electronic screen protective films require low strength and easy tearing. However, the protective film production equipment cannot adjust the tensile strength and can only produce products with a single strength, which makes it difficult to meet different usage needs and results in low product adaptability. Summary of the Invention

[0004] The purpose of this invention is to provide a protective film production apparatus with adjustable tensile strength to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a protective film production device with adjustable tensile strength, comprising a base, a connecting rod fixedly connected to the upper end of the base, a support plate fixedly connected to the upper end of the connecting rod, a sliding hole provided inside the support plate, a sliding rod slidably connected inside the sliding hole, a movable seat fixedly connected to the lower end of the sliding rod, a pressure roller provided at the lower end of the movable seat, a threaded column fixedly connected to the middle of the upper end of the movable seat, a rotating rod provided inside the support plate at a position away from the sliding hole, a limit ring fixedly connected to the outer side of the rotating rod, a rotating wheel fixedly connected to the upper end of the rotating rod, and a threaded sleeve fixedly connected to the other end of the rotating rod.

[0006] The above technical solution achieves the following technical effects: By rotating the wheel, the wheel drives the rotating rod and the screw sleeve to rotate together. Under the action of the external thread of the threaded column, the moving seat moves downward, and the pressure roller will be in close contact with one side of the protective film, increasing its tension and improving the stretching degree of the protective film. Similarly, by rotating the wheel in the opposite direction, the moving seat moves in the opposite direction, and the pressure roller immediately returns to its original height. During the lifting and lowering of the pressure roller, the slide rod will slide inside the slide hole. Under the action of the slide rod and the slide hole, the smoothness of lifting and lowering can be improved.

[0007] Preferably, assembly blocks are fixedly connected to both sides of the base, a stabilizing plate is fixedly connected to the upper edge of the base, a guide roller is provided on one side of the stabilizing plate, an upright plate is fixedly connected to the upper edge of the base at the position of the stabilizing plate, and an output roller is provided on one side of the upright plate.

[0008] Preferably, an arc-shaped plate is fixedly connected to the right side of the base, a rotating shaft is provided on the inner side of the upper end of the arc-shaped plate, a storage roller is fixedly connected to one end of the rotating shaft, a stabilizing block is fixedly connected to the left side of the arc-shaped plate, a pressure block is provided at the upper end of the arc-shaped plate, and a positioning block is fixedly connected to one side of the pressure block.

[0009] Preferably, a fixing rod is fixedly connected to the upper end of the base away from the stabilizing plate, a connecting seat is fixedly connected to the upper end of the fixing rod, a short block is fixedly connected to the upper end of the connecting seat, and a long rod is fixedly connected to one side of the short block.

[0010] Preferably, a motor is provided on one side of the connecting seat, a lead screw is provided at the output end of the motor, a moving block is provided inside the connecting seat, a threaded hole is provided inside the moving block, a connecting block is fixedly connected to the upper end of the moving block, a guide block is fixedly connected to the upper end of the connecting block, and a guide hole is provided inside the guide block.

[0011] The above technical solution achieves the following technical effects: when the motor is turned on, the motor drives the lead screw to rotate. With the cooperation of its external thread and the internal thread of the moving block, the cutter moves to one side to cut the protective film. Similarly, when the motor is turned in the opposite direction, the moving block drives the cutter to move in the opposite direction and return to its original position, waiting for the next cut. In addition, the setting of the connecting block, guide block and long rod can greatly improve the stability of the cutter when it moves.

[0012] Preferably, a fixing seat is fixedly connected to the lower end of the movable block, the fixing seat has slots on both sides, an installation block is provided inside the fixing seat, and a cutter is fixedly connected to one end of the installation block;

[0013] The mounting block has a telescopic rod inside, a first spring outside the telescopic rod, a slider fixedly connected to one end of the telescopic rod, a locking block fixedly connected to one side of the slider, a pressure rod fixedly connected to the left side of the slider, a fixing post fixedly connected inside the mounting block near the telescopic rod, and a second spring inside the fixing post.

[0014] The above technical solution achieves the following technical effects: By pushing the locking block, the locking block drives the slider to move to one side and compresses the telescopic rod and the first spring. During this process, the locking block disengages from the inside of the slot, pulls down the cutter, and the mounting block slides out from the fixed seat, completing the disassembly operation. Similarly, during installation, the mounting block is slid in along the inside of the fixed seat. After it reaches the preset depth, the first spring and the second spring rebound and cause the slider to move in the opposite direction. The locking block is then embedded back into the slot, thus achieving the installation and fixation of the cutter.

[0015] Preferably, the threaded sleeve is rotatably connected to the support plate via a rotating rod.

[0016] Preferably, the internal thread of the sleeve is adapted to the external thread of the stud.

[0017] Preferably, the number of the card blocks is two sets, and they are symmetrically arranged about the center line of the mounting block.

[0018] Compared with the prior art, the beneficial effects of the present invention, using the above technical solution, are as follows:

[0019] 1. By rotating the wheel, the wheel drives the rotating rod and the screw sleeve to rotate together. Under the action of the external thread of the threaded column, the moving seat moves downward, and the pressure roller will be in close contact with one side of the protective film, increasing its tension and improving the stretching degree of the protective film. Similarly, by rotating the wheel in the opposite direction, the moving seat moves in the opposite direction, and the pressure roller returns to its original height. During the lifting and lowering of the pressure roller, the slide rod slides inside the slide hole. The action of the slide rod and the slide hole can improve the smoothness of lifting and lowering. The height of the pressure roller can be adjusted by components such as the wheel, rotating rod, screw sleeve, threaded column, and slide rod, thereby adjusting the tensile strength of the protective film to meet different production needs and improve product adaptability.

[0020] 2. By turning on the motor, the motor drives the lead screw to rotate. With the cooperation of its external thread and the internal thread of the moving block, the cutter moves to one side to cut the protective film. Similarly, turning the motor in the opposite direction causes the moving block to drive the cutter to move in the opposite direction and return to its original position, ready for the next cut. In addition, the setting of connecting block, guide block and long rod can greatly improve the stability of the cutter when moving. Through the components such as motor, lead screw, moving block and guide block, the cutter can move in a cycle, thereby achieving efficient cutting of the protective film, effectively reducing manual intervention, and improving production efficiency.

[0021] 3. By pushing the locking block, the locking block drives the slider to move to one side and compresses the telescopic rod and the first spring. During this process, the locking block disengages from the inside of the slot, pulls the cutter downward, and the mounting block slides out from the fixed seat, completing the disassembly operation. Similarly, during installation, the mounting block is slid in along the inside of the fixed seat. After it reaches the preset depth, the first spring and the second spring rebound and cause the slider to move in the opposite direction. The locking block is then embedded back into the slot, realizing the installation and fixation of the cutter. The mounting block, the first spring, the second spring, the slider, the locking block and other components enable quick installation and removal of the cutter, allowing for replacement when damaged, and also reducing the difficulty of replacement. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the vertical plate structure of the present invention.

[0024] Figure 3 This is a schematic diagram of the screw sleeve structure of the present invention.

[0025] Figure 4 This is a schematic diagram of the internal structure of the connector of the present invention.

[0026] Figure 5 This is a schematic diagram of the movable block structure of the present invention.

[0027] Figure 6 This is a schematic diagram of the cutting blade structure of the present invention.

[0028] Figure 7 This is a schematic diagram of the mounting block structure of the present invention.

[0029] Figure 8 This is a schematic diagram of the arc-shaped plate structure of the present invention.

[0030] In the diagram: 1. Base; 2. Connecting rod; 3. Support plate; 4. Sliding hole; 5. Sliding rod; 6. Moving seat; 7. Pressure roller; 8. Threaded column; 9. Rotating rod; 10. Limiting ring; 11. Rotating wheel; 12. Screw sleeve; 13. Fixed rod; 14. Connecting seat; 15. Short block; 16. Long rod; 17. Motor; 18. Lead screw; 19. Moving block; 20. Threaded hole; 21. Connecting block; 22. Guide block; 23. Guide hole; 24. 25. Fixed base; 26. Slot; 27. Mounting block; 28. Cutting knife; 29. ​​Telescopic rod; 30. First spring; 31. Slider; 32. Locking block; 33. Pressure rod; 34. Fixed column; 35. Second spring; 36. Assembly block; 37. Stabilizing plate; 38. Guide roller; 39. Vertical plate; 40. Outgoing roller; 41. Arc plate; 42. Rotating shaft; 43. Receiving roller; 44. Stabilizing block; 45. Pressure block; 46. Positioning block. Detailed Implementation

[0031] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] Example 1

[0033] Please see Figures 1-8 This invention provides a solution: a protective film production device with adjustable tensile strength, comprising a base 1, a connecting rod 2 fixedly connected to the upper end of the base 1, a support plate 3 fixedly connected to the upper end of the connecting rod 2, a sliding hole 4 opened inside the support plate 3, a sliding rod 5 slidably connected inside the sliding hole 4, a movable seat 6 fixedly connected to the lower end of the sliding rod 5, a pressure roller 7 provided at the lower end of the movable seat 6, a threaded column 8 fixedly connected to the middle of the upper end of the movable seat 6, a rotating rod 9 provided inside the support plate 3 at a position away from the sliding hole 4, a limit ring 10 fixedly connected to the outer side of the rotating rod 9, a rotating wheel 11 fixedly connected to the upper end of the rotating rod 9, a threaded sleeve 12 fixedly connected to the other end of the rotating rod 9, and mounting brackets fixedly connected to both sides of the base 1. A stabilizing plate 36 is fixedly connected to the upper edge of the base 1, and a guide roller 37 is provided on one side of the stabilizing plate 36. A vertical plate 38 is fixedly connected to the upper edge of the base 1 at the position of the stabilizing plate 36, and an export roller 39 is provided on one side of the vertical plate 38. An arc plate 40 is fixedly connected to the right side of the base 1, and a rotating shaft 41 is provided on the inner side of the upper end of the arc plate 40. A receiving roller 42 is fixedly connected to one end of the rotating shaft 41. A stabilizing block 43 is fixedly connected to the left side of the arc plate 40, and a pressure block 44 is provided at the upper end of the arc plate 40. A positioning block 45 is fixedly connected to one side of the pressure block 44. A screw sleeve 12 is rotatably connected to the support plate 3 through a rotating rod 9. The internal thread of the screw sleeve 12 is compatible with the external thread of the stud.

[0034] Specifically, rotating the wheel 11 causes the rotating rod 9 and the screw sleeve 12 to rotate together. Under the action of the external thread of the threaded column 8, the moving seat 6 moves downward, and the pressure roller 7 will press tightly against one side of the protective film, increasing its tension and improving the stretching degree of the protective film. Similarly, rotating the wheel 11 in the opposite direction causes the moving seat 6 to move in the opposite direction, and the pressure roller 7 will then return to its original height. During the lifting and lowering of the pressure roller 7, the slide rod 5 will slide inside the sliding hole 4. Under the action of the slide rod 5 and the sliding hole 4, the smoothness of lifting and lowering can be improved. The height of the pressure roller 7 can be adjusted through components such as the wheel 11, rotating rod 9, screw sleeve 12, threaded column 8, and slide rod 5, thereby adjusting the tensile strength of the protective film to meet different production needs and improve product adaptability.

[0035] Example 2

[0036] Please see Figures 1-8 The present invention provides a technical solution: a protective film production device with adjustable tensile strength. A fixing rod 13 is fixedly connected to the upper end of the base 1 away from the stabilizing plate 36. A connecting seat 14 is fixedly connected to the upper end of the fixing rod 13. A short block 15 is fixedly connected to the upper end of the connecting seat 14. A long rod 16 is fixedly connected to one side of the short block 15. A motor 17 is provided on one side of the connecting seat 14. A lead screw 18 is provided at the output end of the motor 17. A moving block 19 is provided inside the connecting seat 14. A threaded hole 20 is opened inside the moving block 19. A connecting block 21 is fixedly connected to the upper end of the moving block 19. A guide block 22 is fixedly connected to the upper end of the connecting block 21. A guide hole 23 is opened inside the guide block 22.

[0037] Specifically, when motor 17 is turned on, it drives lead screw 18 to rotate. With the cooperation of its external thread and the internal thread of moving block 19, cutter 27 moves to one side to cut the protective film. Similarly, when motor 17 is turned in the opposite direction, moving block 19 drives cutter 27 to move in the opposite direction and return to its original position, waiting for the next cut. In addition, the setting of connecting block 21, guide block 22 and long rod 16 can greatly improve the stability of cutter 27 during movement. Through components such as motor 17, lead screw 18, moving block 19 and guide block 22, cutter 27 can move cyclically, thereby achieving efficient cutting of protective film, effectively reducing manual intervention, and improving production efficiency.

[0038] Example 3

[0039] Please see Figures 1-8 The present invention provides a technical solution: a protective film production device with adjustable tensile strength, wherein a fixed base 24 is fixedly connected to the lower end of a movable block 19, and slots 25 are provided on both sides of the fixed base 24. An installation block 26 is provided inside the fixed base 24, and a cutter 27 is fixedly connected to one end of the installation block 26. A telescopic rod 28 is provided inside the installation block 26, and a first spring 29 is provided outside the telescopic rod 28. A slider 30 is fixedly connected to one end of the telescopic rod 28, and a locking block 31 is fixedly connected to one side of the slider 30. A pressure rod 32 is fixedly connected to the left side of the slider 30. A fixed column 33 is fixedly connected inside the installation block 26 near the telescopic rod 28, and a second spring 34 is provided inside the fixed column 33. There are two sets of locking blocks 31, which are symmetrically arranged about the center line of the installation block 26.

[0040] Specifically, pushing the locking block 31 causes the slider 30 to move to one side and compress the telescopic rod 28 and the first spring 29. During this process, the locking block 31 disengages from the inside of the slot 25, pulls down the cutter 27, and the mounting block 26 slides out from the inside of the fixing seat 24, completing the disassembly operation. Similarly, during installation, the mounting block 26 is slid in along the inside of the fixing seat 24. After it reaches the preset depth, the first spring 29 and the second spring 34 rebound and cause the slider 30 to move in the opposite direction. The locking block 31 is then inserted back into the slot 25, realizing the installation and fixation of the cutter 27. Through the components such as the mounting block 26, the first spring 29, the second spring 34, the slider 30, and the locking block 31, the cutter 27 can be quickly installed and removed, thus enabling replacement when damaged, and also reducing the difficulty of replacement.

[0041] Working Principle: When using this production device, the operator first needs to use assembly block 35 to firmly fix the entire base 1 in the preset working area. This step is crucial to ensuring the stability of the device's operation. The precise positioning and fastening of assembly block 35 effectively prevents the device from shaking or shifting during high-speed operation, laying a solid foundation for the subsequent protective film production process. After the base 1 is fixed, the protective film threading operation begins. The operator carefully guides the free end of the produced protective film and sequentially passes it through guide roller 37 and exit roller 39. The design of these two rollers is highly compatible with the transmission requirements of the protective film. Guide roller 37 contacts the protective film through its smooth surface, providing initial guidance, while exit roller 39 further provides stable support for the protective film. The combination of the two ensures that the protective film remains flat during transmission, effectively avoiding wrinkles or deviations caused by uneven tension, providing qualified semi-finished products for the subsequent storage process. After threading, the starting end of the protective film is smoothly wound around the storage roller 42, ensuring that the initial winding is secure. Subsequently, the external drive structure is activated, and the receiving roller 42 rotates at a set uniform speed under the drive, automatically collecting the continuously produced protective film. As production continues, the protective film is continuously fed to the receiving roller 42, where it is neatly wound up under its continuous rotation, thus achieving production continuity and significantly improving production efficiency. When the protective film on the receiving roller 42 reaches the preset amount, or when the receiving roller 42 needs to be replaced for maintenance, the operation is very convenient. Operators do not need to use complex tools; they can quickly release the limit by simply operating the limiting structure of the receiving roller 42 using the pressure block 44.At this point, the full receiving roller 42 can be easily removed, replaced with a new receiving roller 42, and then the limiting and fixing are completed again by the pressure block 44, which can immediately restore the protective film receiving work. The whole replacement process is short, greatly reducing production interruption time and ensuring the continuous operation of the equipment. Before replacing the new receiving roller 42, the motor 17 is turned on. The motor 17 drives the lead screw 18 to rotate. With the cooperation of its external thread and the internal thread of the moving block 19, the cutter 27 moves to one side to cut the protective film. Similarly, the motor 17 is turned in the opposite direction, and the moving block 19 drives the cutter 27 to move in the opposite direction and return to its original position, waiting for the next cut. In addition, the connecting block 2 1. The guide block 22 and long rod 16 greatly improve the stability of the cutter 27 during movement. The motor 17, lead screw 18, moving block 19, guide block 22, and other components enable the cutter 27 to move cyclically, thus achieving efficient cutting of the protective film, effectively reducing manual intervention and improving production efficiency. When replacing a damaged cutter 27, pushing the locking block 31 causes the slider 30 to move to one side and compress the telescopic rod 28 and the first spring 29. During this process, the locking block 31 disengages from the slot 25, pulling the cutter 27 downwards. The mounting block 26 then slides out from the fixed base 24, completing the disassembly. Similarly, during installation, the mounting block 26 is slid in along the inner side of the fixing seat 24. After reaching the preset depth, the first spring 29 and the second spring 34 rebound, causing the slider 30 to move in the opposite direction. The locking block 31 then re-enters the slot 25, thus installing and fixing the cutter 27. The mounting block 26, the first spring 29, the second spring 34, the slider 30, and the locking block 31 enable quick installation and removal of the cutter 27, facilitating replacement when damaged and reducing the difficulty of replacement. When it is necessary to adjust the tension of the protective film, the rotating wheel 11 is rotated, causing the rotating rod 9 and the threaded sleeve 12 to rotate together. Under the action of the external thread of column 8, the moving seat 6 moves downward, and the pressure roller 7 will be in close contact with one side of the protective film, increasing its tension and improving the stretching degree of the protective film. Similarly, when the rotating wheel 11 is rotated in the opposite direction, the moving seat 6 moves in the opposite direction, and the pressure roller 7 then returns to its original height. During the lifting and lowering of the pressure roller 7, the slide rod 5 will slide inside the sliding hole 4. The smoothness of lifting and lowering can be improved by the action of the slide rod 5 and the sliding hole 4. The height of the pressure roller 7 can be adjusted by components such as rotating wheel 11, rotating rod 9, screw sleeve 12, threaded column 8, and slide rod 5, thereby adjusting the tensile strength of the protective film to meet different production needs and improve the adaptability of the product.

[0042] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A protective film production apparatus with adjustable tensile strength, comprising a base (1), characterized in that: A connecting rod (2) is fixedly connected to the upper end of the base (1), and a support plate (3) is fixedly connected to the upper end of the connecting rod (2). A sliding hole (4) is opened inside the support plate (3), and a sliding rod (5) is slidably connected inside the sliding hole (4). A movable seat (6) is fixedly connected to the lower end of the sliding rod (5). A pressure roller (7) is provided at the lower end of the movable seat (6). A threaded column (8) is fixedly connected to the middle of the upper end of the movable seat (6). A rotating rod (9) is provided inside the support plate (3) at a position away from the sliding hole (4). A limit ring (10) is fixedly connected to the outer side of the rotating rod (9). A rotating wheel (11) is fixedly connected to the upper end of the rotating rod (9), and a threaded sleeve (12) is fixedly connected to the other end of the rotating rod (9).

2. The protective film production apparatus with tensile strength adjustment according to claim 1, characterized in that: Assembly blocks (35) are fixedly connected to both sides of the base (1), a stabilizing plate (36) is fixedly connected to the upper edge of the base (1), a guide roller (37) is provided on one side of the stabilizing plate (36), a vertical plate (38) is fixedly connected to the upper edge of the stabilizing plate (36) of the base (1), and an export roller (39) is provided on one side of the vertical plate (38).

3. The protective film production apparatus with adjustable tensile strength according to claim 2, characterized in that: An arc-shaped plate (40) is fixedly connected to the right side of the base (1). A rotating shaft (41) is provided on the inner side of the upper end of the arc-shaped plate (40). A storage roller (42) is fixedly connected to one end of the rotating shaft (41). A stabilizing block (43) is fixedly connected to the left side of the arc-shaped plate (40). A pressure block (44) is provided at the upper end of the arc-shaped plate (40). A positioning block (45) is fixedly connected to one side of the pressure block (44).

4. The protective film production apparatus with adjustable tensile strength according to claim 2, characterized in that: A fixing rod (13) is fixedly connected to the upper end of the base (1) away from the stabilizing plate (36). A connecting seat (14) is fixedly connected to the upper end of the fixing rod (13). A short block (15) is fixedly connected to the upper end of the connecting seat (14). A long rod (16) is fixedly connected to one side of the short block (15).

5. A protective film production apparatus with adjustable tensile strength according to claim 4, characterized in that: A motor (17) is provided on one side of the connecting seat (14), and a lead screw (18) is provided at the output end of the motor (17). A moving block (19) is provided inside the connecting seat (14), and a threaded hole (20) is provided inside the moving block (19). A connecting block (21) is fixedly connected to the upper end of the moving block (19), and a guide block (22) is fixedly connected to the upper end of the connecting block (21). A guide hole (23) is provided inside the guide block (22).

6. A protective film production apparatus with adjustable tensile strength according to claim 5, characterized in that: The lower end of the movable block (19) is fixedly connected to a fixed base (24), and the fixed base (24) has slots (25) on both sides. The fixed base (24) has an installation block (26) inside, and the lower end of the installation block (26) is fixedly connected to a cutter (27). The mounting block (26) is provided with a telescopic rod (28) inside, and a first spring (29) is provided on the outside of the telescopic rod (28). A slider (30) is fixedly connected to one end of the telescopic rod (28). A locking block (31) is fixedly connected to one side of the slider (30). A pressure rod (32) is fixedly connected to the left side of the slider (30). A fixing post (33) is fixedly connected to the inside of the mounting block (26) near the telescopic rod (28). A second spring (34) is provided inside the fixing post (33).

7. A protective film production apparatus with adjustable tensile strength according to claim 1, characterized in that: The threaded sleeve (12) is rotatably connected to the support plate (3) via the rotating rod (9).

8. The protective film production apparatus with tensile strength adjustment according to claim 1, characterized in that: The internal thread of the sleeve (12) is adapted to the external thread of the stud.

9. A protective film production apparatus with adjustable tensile strength according to claim 6, characterized in that: The number of the card blocks (31) is two sets, and they are symmetrically arranged about the center line of the mounting block (26).

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