Positioning device for protective film production and positioning method thereof

Abstract

The invention belongs to the technical field of protective film production, and discloses a positioning device for protective film production and a positioning method.The positioning device comprises a positioning table, a rectangular groove is formed in the middle of the positioning table in a penetrating mode, the left side of the interior of the rectangular groove is slidably sleeved with a first sliding base, and the right side of the interior of the rectangular groove is slidably sleeved with a second sliding base; the top of the first sliding base and the top of the second sliding base are each provided with a bearing assembly. By means of the positioning table and the rectangular groove, main body bearing of the structure on the positioning table and the rectangular groove is facilitated, and meanwhile the first sliding base, the second sliding base, the bearing assembly, the limiting disc and the driving motor which are arranged on the two sides of the positioning table and the rectangular groove are matched, so that the butt-clamping type bearing effect on a used winding drum can be achieved in the protective film production and winding process; and the positioning device can be effectively suitable for positioning the winding drums with different inner diameter sizes.

Description

Technical Field

[0001] This application relates to the field of protective film production technology, and more specifically, to a positioning device and positioning method for protective film production. Background Technology

[0002] Screen protectors can be categorized by their use into digital product protectors, automotive protectors, household protectors, and food preservation protectors. With the widespread adoption of mobile phones and other digital products in China, screen protectors have gradually become a general term for screen protectors. Their functions in the field of screen protectors are also diverse, and the materials have evolved over many years, from the earliest PP material to the currently popular AR material.

[0003] Currently, in the production process of protective film, there is a process of winding the protective film on the outer wall of different rolls. The winding process of the protective film on the rolls requires repeated disassembly and repositioning operations on different rolls. However, the existing protective film roll positioning devices are generally designed for positioning rolls of the same size and specification, which results in a problem of low applicability to protective film rolls of different sizes.

[0004] To address the aforementioned problems, this application provides a positioning device and positioning method for protective film production. Summary of the Invention

[0005] The positioning device and positioning method for protective film production provided in this application adopt the following technical solution:

[0006] A positioning device and positioning method for protective film production includes a positioning platform. A rectangular groove is provided through the middle of the positioning platform. A first slide block is slidably sleeved on the left side inside the rectangular groove, and a second slide block is slidably sleeved on the right side inside the rectangular groove. Support components are provided on the top of the first slide block and the second slide block, and the two sets of support components are symmetrically distributed on both sides of the upper end of the positioning platform.

[0007] The supporting assembly includes a vertical plate fixedly installed on one side of the top of the first slide or the second slide. A rotating shaft is rotatably sleeved through the inner cavity of the upper end of the vertical plate. A baffle is fixedly connected to one end of the rotating shaft. A connecting column is fixedly connected to the center of the end face of the baffle facing away from the rotating shaft. A clamping cylinder is fixedly connected to one end of the connecting column, and an adjustment structure is provided on the clamping cylinder. A slide rail ring is fixedly connected to one side of the upper end of the vertical plate. The slide rail ring is located outside the rotating shaft, and multiple sliders are uniformly slidably sleeved on one side of the outer surface of the slide rail ring. The multiple sliders are all fixedly installed on the outer periphery of one end face of the baffle.

[0008] A limit plate is fixedly installed at one end of the left rotating shaft facing away from the baffle, while a drive motor is connected to the other end of the right rotating shaft facing away from the baffle. The drive motor is fixedly installed on the outer surface of the upper end of the right upright plate.

[0009] Through the above technical solution, the limiting plate achieves the limiting function on one side of the left rotating shaft.

[0010] Furthermore, the adjustment structure includes a threaded cylinder that is rotatably sleeved through the inner cavity of the outer end of the clamping cylinder. A sleeve disc is fixedly sleeved on the outer walls of both sides of the middle portion of the threaded cylinder. A groove is embedded in the outer wall of the middle portion of the sleeve disc, and a support is rotatably sleeved through the groove on the outer wall of the middle portion of the sleeve disc. The support is fixedly installed on one side of the inner wall of the clamping cylinder. Threaded rods are symmetrically screwed onto the inner walls of both sides of the threaded cylinder. An arc-shaped top bar is fixedly connected to one opposite end of each of the two threaded rods. Both arc-shaped top bars are located outside the clamping cylinder, and a limiting slide rod is fixedly connected to one end face of each of the two arc-shaped top bars. Both limiting slide rods are slidably sleeved through the inner cavity of one side of the clamping cylinder.

[0011] Furthermore, both of the arc-shaped top bars have a semi-circular arc surface design on the side facing away from the threaded rod, and anti-slip rubber pads are fixedly installed on the outer surface of the side of both arc-shaped top bars facing away from the threaded rod.

[0012] Furthermore, the adjustment structure also includes a gear one that is fixedly sleeved and installed on the outer wall of the middle part of the threaded cylinder. A gear two is meshed on one side end of the gear one. An adjustment motor is connected to one end face of the gear two through a first rotating shaft. The outer surface of the adjustment motor is fixedly connected to the inner wall of the clamping cylinder through a pad.

[0013] The above technical solution allows the adjustment structure to be used for positioning drums with different inner diameters.

[0014] Furthermore, slide rails are fixedly connected to both sides of the middle portion of the first slide block and the second slide block, and slide grooves are slidably sleeved on the outer walls of the two slide rails on each side. The two slide grooves are respectively embedded in the inner walls of the front and rear sides of the rectangular groove.

[0015] Through the above technical solution, the slide rail and slide groove achieve a movable and stable support for the first slide block and the second slide block.

[0016] Furthermore, support legs are fixedly installed at the four corners of the bottom of the positioning platform, and multiple mounting holes are evenly opened around the bottom of each support leg. A control panel is fixedly installed at one corner of the top of the positioning platform.

[0017] Through the above technical solution, the support legs and mounting holes achieve the function of fixing and assembling the whole on the required support platform.

[0018] Furthermore, a square hole 1 is provided through the inner cavity on the rear side of the first slide block, and a square hole 2 is provided on the axial side of the square hole 1. The square hole 2 is located at the left end of the positioning platform. A square hole 3 is provided through the inner cavity on the front side of the second slide block, and a square hole 4 is provided on the axial side of the square hole 3. The square hole 4 is located at the right end of the positioning platform.

[0019] Furthermore, a first rack is fixedly connected to the front side of one end face of the first slide, and the side of the first rack away from the first slide is slidably sleeved with square hole three and square hole four respectively. A second rack is fixedly connected to the rear side of one end face of the second slide, and the side of the second rack away from the second slide is slidably sleeved with square hole one and square hole two respectively. A displacement gear is meshed between the opposing positions of the first rack and the second rack. The displacement gear is located inside the rectangular groove, and the bottom of the displacement gear is connected to a displacement motor through a second rotating shaft.

[0020] Through the above technical solutions, square holes one, two, three, and four respectively achieve the movable accommodating function of a local position on one side of the first rack and the second rack.

[0021] Furthermore, a fixed support plate is fixedly installed on the outer surface of the bottom of the displacement motor. The fixed support plate has a "U" shaped plate structure, and the top of both sides of the fixed support plate is fixedly connected to the bottom of the positioning platform.

[0022] Through the above technical solution, the fixed support plate achieves the function of supporting and fixing the displacement motor, thereby ensuring the meshing stability of the displacement gear with the first rack and the second rack.

[0023] Furthermore, this includes the following steps:

[0024] S1, while placing the protective film roll between the two clamping cylinders, adjust the spacing between the two clamping cylinders according to the specific length of the roll. During the adjustment, simply control the displacement motor to drive the displacement gear. Utilize the meshing state of the two ends of the displacement gear with the first and second racks respectively, so that the first and second slides slide relative to each other inside the rectangular groove. This indirectly drives the two clamping cylinders to adjust the spacing until the two ends of the roll are in contact with the two side baffles. During this process, each slide rail on both sides of the first and second slides performs a supporting sliding cooperation on the inner wall of each slide groove.

[0025] S2, adjust the working distance between the two arc-shaped top bars on each side according to the specific inner diameter of the drum, until the inner walls on both sides of the drum are in a contact-type inner lining positioning state. During the adjustment, only the adjustment motor needs to be controlled to drive the second gear. By utilizing the meshing state of the second gear and the rotational limiting state of the threaded drum by the side supports and the sleeve, the threaded drum is indirectly made to rotate. At this time, due to the sliding limiting effect of each limiting slide bar on the arc-shaped top bar, the threaded bars on both sides are indirectly made to move in opposite directions. Under the pressing contact effect between the arc-shaped top bar and the inner wall of the drum end, it can be used to position drums with different inner diameters, thereby facilitating the subsequent production of the protective film.

[0026] S3, based on the clamping and inner lining top-holding positioning state of the protective film roll, the drive motor drives the right rotating shaft to rotate, so that the right baffle rotates and drives the positioned roll to rotate, thereby driving the left baffle and rotating shaft to rotate synchronously. In this process, the protective film can be evenly wound on the outer wall of the roll during production. During the passive rotation of the two baffles, the sliders on each side drive the sliders on the outer wall of the slide rail ring to perform circumferential limiting sliding and cooperating movements.

[0027] In summary, this application includes the following beneficial technical effects:

[0028] (1) The positioning platform and rectangular groove provided in this application are conducive to supporting the main structure above it. At the same time, the first slide, second slide, support components, limit plate and drive motor provided on both sides can play a clamping support role for the roll used in the production and winding process of protective film, and can be effectively applied to rolls with different inner diameters for positioning work.

[0029] (2) The first rack, the second rack, the displacement gear and the displacement motor set between the first slide and the second slide, together with the square hole one, square hole two, square hole three and square hole four, can effectively adjust the clamping position of the drum, thus facilitating the effective application of drums of different lengths. Attached Figure Description

[0030] Figure 1 This is one of the overall structural diagrams of this application;

[0031] Figure 2 This is a first partial perspective view of this application;

[0032] Figure 3 This is a partial semi-exploded view of this application;

[0033] Figure 4 This is a three-dimensional view of the adjustment structure of this application;

[0034] Figure 5 This is the second schematic diagram of the overall structure of this application;

[0035] Figure 6 This is a partial semi-exploded view of the second part of this application.

[0036] Explanation of the labels in the diagram:

[0037] 1. Positioning platform; 2. Rectangular groove; 3. First slide; 4. Second slide; 5. Support assembly; 51. Vertical plate; 52. Rotating shaft; 53. Baffle; 54. Connecting column; 55. Mounting cylinder; 56. Adjustment structure; 561. Threaded cylinder; 562. Sleeve disc; 563. Support; 564. Threaded rod; 565. Arc-shaped top bar; 566. Limiting slide bar; 567. Gear one; 568. Gear two; 569. Adjusting motor; 57. Slide rail ring; 58. Slider; 6. Limiting plate; 7. Drive motor; 8. Slide rail; 9. Slide groove; 10. Support leg; 11. Control panel; 12. First rack; 13. Second rack; 14. Displacement gear; 15. Displacement motor. Detailed Implementation

[0038] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0039] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] Example:

[0042] This application discloses a positioning device and method for protective film production. Please refer to [link to relevant documentation]. Figure 1 , Figure 2 , Figure 3 and Figure 4 The system includes a positioning platform 1, a rectangular groove 2 that runs through the center of the positioning platform 1, a first slide block 3 that is slidably sleeved on the left side inside the rectangular groove 2, and a second slide block 4 that is slidably sleeved on the right side inside the rectangular groove 2. The top of the first slide block 3 and the second slide block 4 are both provided with support components 5, and the two sets of support components 5 are symmetrically distributed on both sides of the upper end of the positioning platform 1.

[0043] The supporting assembly 5 includes a vertical plate 51 fixedly installed on one side of the top of the first slide block 3 or the second slide block 4. A rotating shaft 52 is rotatably sleeved through the inner cavity of the upper end of the vertical plate 51. A baffle 53 is fixedly connected to one end of the rotating shaft 52. A connecting column 54 is fixedly connected to the center of the end face of the baffle 53 facing away from the rotating shaft 52. A clamping cylinder 55 is fixedly connected to one end of the connecting column 54. An adjustment structure 56 is provided on the clamping cylinder 55. A slide rail ring 57 is fixedly connected to one side of the upper end of the vertical plate 51. The slide rail ring 57 is located outside the rotating shaft 52. Multiple sliders 58 are uniformly slidably sleeved on the outer circumference of one side of the outer surface of the slide rail ring 57. The multiple sliders 58 are all fixedly installed on the outer periphery of one end face of the baffle 53. A limit plate 6 is fixedly installed on the end of the left rotating shaft 52 facing away from the baffle 53, while a drive motor 7 is connected to the end of the right rotating shaft 52 facing away from the baffle 53. The drive motor 7 is fixedly installed on the outer surface of the upper end of the right vertical plate 51.

[0044] The adjusting structure 56 includes a threaded cylinder 561 that is rotatably sleeved into the inner cavity of the outer end of the clamping cylinder 55. A sleeve disc 562 is fixedly sleeved on the outer walls of both sides of the middle portion of the threaded cylinder 561. A groove is embedded in the outer wall of the middle portion of the sleeve disc 562, and a support 563 is rotatably sleeved on the outer wall of the middle portion of the sleeve disc 562 through the groove. The support 563 is fixedly installed on one side of the inner wall of the clamping cylinder 55. Threaded rods 564 are symmetrically screwed onto the inner walls of both sides of the threaded cylinder 561. An arc-shaped top bar 565 is fixedly connected to the opposite ends of the two threaded rods 564. Both arc-shaped top bars 565 are located outside the clamping cylinder 55. The two arc-shaped top bars 565 are fixedly connected to the end faces of one side of each of the two arc-shaped top bars 565. The two limiting slide bars 566 are slidably sleeved through the inner cavity of the outer end of the clamping cylinder 55. The side of each arc-shaped top bar 565 facing away from the threaded rod 564 is designed with a semi-circular arc surface. The outer surface of the side of each arc-shaped top bar 565 facing away from the threaded rod 564 is fixedly equipped with anti-slip rubber pads. With the anti-slip rubber pads on the outer end of the arc-shaped top bars 565, the contact anti-slip effect between the arc-shaped top bars 565 and the inner wall of the protective film roll side end can be effectively improved, thereby improving the stability of the roll rotation and winding of the protective film.

[0045] The adjustment structure 56 also includes a gear 567 fixedly sleeved and installed on the outer wall of the middle part of the threaded cylinder 561. One end of the gear 567 is meshed with a gear 568. One end face of the gear 568 is connected to an adjustment motor 569 through a first rotating shaft. The outer surface of the adjustment motor 569 is fixedly connected to the inner wall of the clamping cylinder 55 through a pad.

[0046] The first slide block 3 and the second slide block 4 are both fixedly connected to the two side walls of the middle section. The outer walls of the two slide blocks 8 on each side are slidably fitted with the slide grooves 9. The two slide grooves 9 are respectively embedded in the inner walls of the front and rear sides of the rectangular groove 2. The four corners of the bottom of the positioning platform 1 are fixedly installed with support legs 10. The bottom periphery of each support leg 10 is evenly provided with multiple mounting holes. The control panel 11 is fixedly installed at one corner of the top of the positioning platform 1.

[0047] Please see Figure 1 , Figure 5 and Figure 6 The first slide 3 has a through-hole 1 in its rear cavity, and a second square hole 2 is located on the axial side of the first square hole 1. The second square hole 2 is located at the left end of the positioning platform 1. The second slide 4 has a through-hole 3 in its front cavity, and a fourth square hole 4 is located on the axial side of the third square hole 3. The fourth square hole 4 is located at the right end of the positioning platform 1. A first rack 12 is fixedly connected to the front side of one end face of the first slide 3, and the side of the first rack 12 away from the first slide 3 is slidably sleeved with the third and fourth square holes respectively. The second slide 4 has a fixed connection to the rear side of one end face. There is a second rack 13, and the side of the second rack 13 away from the second slide block 4 is slidably sleeved with square hole one and square hole two respectively. The first rack 12 and the second rack 13 are meshed together with a displacement gear 14 at their opposite positions. The displacement gear 14 is located inside the rectangular groove 2, and the bottom of the displacement gear 14 is connected to a displacement motor 15 through a second rotating shaft. A fixed support plate is fixedly installed on the outer surface of the bottom of the displacement motor 15. The fixed support plate has a "U" shaped plate structure, and the top of both sides of the fixed support plate is fixedly connected to the bottom of the positioning table 1.

[0048] The control panel 11 is electrically connected to and controlled by the regulating motor 569, the drive motor 7, and the displacement motor 15 via wires. The connection and control functions of the control panel 11 can be implemented by programming, which is existing technology and will not be described in detail here.

[0049] The implementation principle of this application embodiment includes the following steps:

[0050] S1, while placing the protective film roll between the two clamping cylinders 55, adjust the distance between the two clamping cylinders 55 according to the specific length of the roll. During the adjustment, simply control the displacement motor 15 to drive the displacement gear 14. The two ends of the displacement gear 14 mesh with the first rack 12 and the second rack 13 respectively, so that the first slide block 3 and the second slide block 4 slide relative to each other inside the rectangular groove 2. This indirectly drives the clamping cylinders 55 to adjust the distance until the two ends of the roll are in contact with the two side baffles 53 respectively. During this process, each slide rail 8 on both sides of the first slide block 3 and the second slide block 4 performs a supporting sliding cooperation on the inner wall of each slide groove 9.

[0051] S2, adjust the working distance between the two arc-shaped top bars 565 on each side according to the specific inner diameter of the drum, until the inner walls on both sides of the drum are in a contact-type inner lining positioning state. During the adjustment, only the adjustment motor 569 is controlled to drive the gear 2 568. During the process, the meshing state of the gear 2 568 and the gear 1 567, as well as the rotational limiting state of the threaded cylinder 561 by the side supports 563 and the sleeve 562, indirectly cause the threaded cylinder 561 to rotate. At this time, due to the sliding limiting effect of each limiting slide rod 566 on the arc-shaped top bar 565, the threaded rods 564 on both sides move in opposite directions. Under the pressing contact effect between the arc-shaped top bar 565 and the inner wall of the drum end, it can be used to position drums with different inner diameters, thereby facilitating the subsequent production of the protective film.

[0052] S3, based on the clamping and inner lining top-holding positioning state of the protective film roll, the drive motor 7 drives the right rotating shaft 52 to rotate, so that the right baffle 53 rotates and drives the positioned roll to rotate, thereby driving the left baffle 53 and rotating shaft 52 to rotate synchronously. In this process, the protective film can be evenly wound on the outer wall of the roll during production. During the passive rotation of the two baffles 53, the sliders 58 on each side drive the sliders 58 to perform circumferential limiting sliding and cooperating movements on the outer wall of the slide rail ring 57.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A positioning device for protective film production, comprising a positioning stage (1), characterized in that: The positioning platform (1) has a rectangular groove (2) through the middle. A first slide block (3) is slidably sleeved on the left side inside the rectangular groove (2), and a second slide block (4) is slidably sleeved on the right side inside the rectangular groove (2). Support components (5) are provided on the top of the first slide block (3) and the second slide block (4), and the two sets of support components (5) are symmetrically distributed on both sides of the upper end of the positioning platform (1). The supporting component (5) includes a vertical plate (51) fixedly installed on one side of the top of the first slide (3) or the second slide (4). The upper cavity of the vertical plate (51) is rotatably sleeved with a rotating shaft (52). One end of the rotating shaft (52) is fixedly connected to a baffle (53). The center of the end face of the baffle (53) facing away from the rotating shaft (52) is fixedly connected to a connecting column (54). One end of the connecting column (54) is fixedly connected to a clamping cylinder (55), and the clamping cylinder (55) is provided with an adjustment structure (56). One side of the upper end of the vertical plate (51) is fixedly connected to a slide rail ring (57). The slide rail ring (57) is located outside the rotating shaft (52), and a plurality of sliders (58) are uniformly slidably sleeved on one side of the outer surface of the slide rail ring (57). The plurality of sliders (58) are all fixedly installed on the outer periphery of one end face of the baffle (53). A limiting plate (6) is fixedly installed at one end of the left rotating shaft (52) facing away from the baffle (53), while a drive motor (7) is connected to the other end of the right rotating shaft (52) facing away from the baffle (53). The drive motor (7) is fixedly installed on the outer surface of the upper end of the right upright plate (51).

2. The positioning device for protective film production according to claim 1, characterized in that: The adjustment structure (56) includes a threaded cylinder (561) that is rotatably sleeved on the inner cavity of the outer end of the clamping cylinder (55). A sleeve disc (562) is fixedly sleeved on the outer walls of both sides of the middle portion of the threaded cylinder (561). A groove is embedded in the outer wall of the middle portion of the sleeve disc (562), and a support (563) is rotatably sleeved on the outer wall of the middle portion of the sleeve disc (562) through the groove. The support (563) is fixedly installed on one side of the inner wall of the clamping cylinder (55). Threaded rods (564) are symmetrically screwed onto the inner walls of both sides of the cylinder (561). An arc-shaped top bar (565) is fixedly connected to the opposite end of each of the two threaded rods (564). Both arc-shaped top bars (565) are located outside the clamping cylinder (55), and a limiting slide bar (566) is fixedly connected to the end face of one side of each arc-shaped top bar (565). Both limiting slide bars (566) are slidably sleeved through the inner cavity of the outer end of one side of the clamping cylinder (55).

3. The positioning device for protective film production according to claim 2, characterized in that: Both of the arc-shaped top bars (565) have a semi-circular arc surface design on the side facing away from the threaded rod (564), and anti-slip rubber pads are fixedly installed on the outer surface of the side of the two arc-shaped top bars (565) facing away from the threaded rod (564).

4. A positioning device for protective film production according to claim 2, characterized in that: The adjustment structure (56) further includes a gear one (567) fixedly sleeved and installed on the outer wall of the middle part of the threaded cylinder (561). One side end of the gear one (567) is meshed with a gear two (568). One end face of the gear two (568) is connected to an adjustment motor (569) through a first rotating shaft. The outer surface of the adjustment motor (569) is fixedly connected to the inner wall of the clamping cylinder (55) through a pad.

5. A positioning device for protective film production according to claim 1, characterized in that: The first slide (3) and the second slide (4) are fixedly connected to the two side walls of the middle part of the slide rails (8), and the outer walls of the two slide rails (8) on each side are slidably sleeved with the slide grooves (9). The two slide grooves (9) are respectively embedded in the inner walls of the front and rear sides of the rectangular groove (2).

6. A positioning device for protective film production according to claim 1, characterized in that: Support legs (10) are fixedly installed at the four corners of the bottom of the positioning platform (1), and multiple mounting holes are evenly opened around the bottom of each support leg (10). A control panel (11) is fixedly installed at one corner of the top of the positioning platform (1).

7. A positioning device for protective film production according to claim 1, characterized in that: The inner cavity of the first slide (3) is provided with a through-hole 1, and the axial side of the first square hole is provided with a second square hole, which is located at the left end of the positioning table (1). The inner cavity of the second slide (4) is provided with a through-hole 3, and the axial side of the third square hole is provided with a fourth square hole, which is located at the right end of the positioning table (1).

8. A positioning device for protective film production according to claim 7, characterized in that: A first rack (12) is fixedly connected to the front side of one end face of the first slide (3), and the side of the first rack (12) away from the first slide (3) is slidably sleeved with square hole three and square hole four respectively. A second rack (13) is fixedly connected to the rear side of one end face of the second slide (4), and the side of the second rack (13) away from the second slide (4) is slidably sleeved with square hole one and square hole two respectively. A displacement gear (14) is meshed between the positions of the first rack (12) and the second rack (13) relative to each other. The displacement gear (14) is located inside the rectangular groove (2), and the bottom of the displacement gear (14) is connected to a displacement motor (15) through a second rotating shaft.

9. A positioning device for protective film production according to claim 8, characterized in that: A fixed support plate is fixedly installed on the outer surface of the bottom of the displacement motor (15). The fixed support plate has a "U" shaped plate structure, and the top of both sides of the fixed support plate is fixedly connected to the bottom of the positioning table (1).

10. A positioning method for a positioning device used in protective film production, characterized in that, Includes the following steps: S1, while placing the protective film roll between the two clamping cylinders (55), adjust the distance between the two clamping cylinders (55) according to the specific length of the roll. During the adjustment, simply control the displacement motor (15) to drive the displacement gear (14). The two ends of the displacement gear (14) mesh with the first rack (12) and the second rack (13) respectively, so that the first slide (3) and the second slide (4) slide relative to each other inside the rectangular groove (2), thereby indirectly driving the two clamping cylinders (55) to adjust the distance until the two ends of the roll are in contact with the two side baffles (53). During this process, each slide rail (8) on both sides of the first slide (3) and the second slide (4) performs a supporting sliding cooperation on the inner wall of each side groove (9). S2, adjust the working distance between the two arc-shaped top bars (565) on each side according to the specific inner diameter of the drum, until the inner wall of both sides of the drum is in a contact-type inner lining positioning state. During the adjustment, only the adjustment motor (569) is controlled to drive the gear two (568). During the process, the meshing state of the gear two (568) and the gear one (567), and the rotational limiting state of the threaded cylinder (561) by the two side supports (563) and the sleeve (562) indirectly cause the threaded cylinder (561) to rotate. At this time, due to the sliding limiting effect of each limiting slide rod (566) on the arc-shaped top bar (565), the two side threaded rods (564) move in opposite directions. Under the pressing contact effect between the arc-shaped top bar (565) and the inner wall of the drum end, it can be used to position drums with different inner diameters, thereby facilitating the subsequent production of the protective film. S3, based on the clamping and inner lining top-holding positioning state of the protective film roll, the drive motor (7) drives the right rotating shaft (52) to rotate, so that the right baffle (53) rotates and drives the positioned roll to rotate, thereby driving the left baffle (53) and rotating shaft (52) to rotate synchronously. In this process, the protective film can be evenly wound on the outer wall of the roll during production. During the passive rotation of the two baffles (53), the sliders (58) on each side are driven to perform circumferential limiting sliding and cooperating movements on the outer wall of the slide rail ring (57).

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