A kind of unwinding device for coating the surface of copper and aluminum profile and its use method

Abstract

The present invention discloses an unwinding device for coating the surface of copper and aluminum profiles and a method for using the device, which relates to the technical field related to coating the surface of copper and aluminum profiles, including a workbench and a hollow support plate and an unwinding roller for unwinding, wherein one end of the hollow support plate is fixedly connected to the upper end face of the workbench, one end of the unwinding roller is movably mounted on one side of the hollow support plate, and an anti-wrinkle component for preventing wrinkles of the protective film is arranged inside the hollow support plate. By allowing the positioning plate to rotate synchronously with the continuous reduction of the protective film, so that the protective film between the sliding groove and the unwinding roller is always in a parallel state with the upper end face of the workbench, wrinkles can be prevented when the protective film slides, and the problem of the protective film being prone to wrinkles when the protective film slides continuously in the prior art is solved, which leads to the problem that the protective film and the surface of the copper and aluminum profile are not firmly adhered, and the protective film and the surface of the copper and aluminum profile groove are easily prevented from falling off.

Description

Technical Field

[0001] The invention relates to the technical field related to copper and aluminum profile surface coating, and in particular to an unwinding device for copper and aluminum profile surface coating and a use method thereof. Background Art

[0002] Copper-aluminum alloy materials refer to alloy materials synthesized from copper and aluminum in a certain proportion. They have high strength, good conductivity and corrosion resistance, and are widely used in the fields of electricity, shipbuilding and chemical production.

[0003] Copper and aluminum materials need to go through a step-by-step processing during production, among which coating the surface of copper and aluminum profiles is an indispensable step in production. Coating the surface of copper and aluminum profiles can protect their outer surface through a protective film during production, transportation, storage, processing and assembly, and prevent scratches on the surface of copper and aluminum profiles, so as to facilitate the later use of copper and aluminum profiles and improve their own aesthetics.

[0004] When coating the surface of existing copper and aluminum profiles, it is necessary to unwind the protective film through an unwinding device. As the protective film is continuously unwound, the protective film can be covered on the surface of the copper and aluminum profile, thereby achieving coating on the surface of the copper and aluminum profile. When the traditional unwinding device unwinds the protective film, as the protective film continues to slide, wrinkles are easily formed on the side walls of the protective film, which leads to bubbles easily forming between the protective film and the side walls of the copper and aluminum profile material, making the protective film and the side walls of the copper and aluminum groove not firmly adhered, resulting in the protective film and the outer wall of the copper and aluminum profile easily falling off. Therefore, a unwinding device that can facilitate coating of the surface of copper and aluminum profiles is needed. Summary of the invention

[0005] The object of the present invention is to provide a rewinding device for coating the surface of copper-aluminum profiles and a method for using the same, so as to solve the problem proposed in the above-mentioned background technology that the protective film keeps sliding, the side walls of the protective film are prone to wrinkles, bubbles are easily formed between the protective film and the side walls of the copper-aluminum profile material, the protective film and the side walls of the copper-aluminum groove are not firmly adhered, and the protective film and the outer wall of the copper-aluminum profile are easily detached.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a unwinding device for coating the surface of copper and aluminum profiles and a method of using the same, comprising a workbench, a hollow support plate and an unwinding roller for unwinding, one end of the hollow support plate is fixedly connected to the upper end surface of the workbench, one end of the unwinding roller is movably mounted on one side of the hollow support plate, and an anti-wrinkle component is arranged inside the hollow support plate to prevent the protective film from wrinkling.

[0007] The anti-wrinkle component includes a positioning plate and a limiting plate. A support rod is rotatably installed on the side of the hollow support plate away from the unwinding roller. One end of the support rod away from the hollow support plate is fixedly connected to one side of the positioning plate. One end of the limiting plate is rotatably connected to the side of the positioning plate close to the hollow support plate, and a sliding groove for sliding of the protective film is opened at the end of the limiting plate away from the positioning plate.

[0008] The anti-wrinkle component also includes a driving wheel and a driven wheel, one end of the driving wheel and one end of the driven wheel are both rotatably connected to the side wall of the hollow support plate, the side wall of the driving wheel is rotatably installed with a transmission belt for being rotatably connected to the side wall of the driven wheel, a gear is fixedly installed on the end of the support rod away from the positioning plate, a rack plate meshing with the gear is fixedly installed on the side wall of the transmission belt close to the driving wheel, and a transmission component for reducing the sliding resistance of the protective film is provided on the upper end surface of the workbench.

[0009] In a further embodiment, a slide groove connected to the inner cavity of the hollow support plate is opened on one side close to the unwinding roller, and a brake block is slidably installed in the inner cavity of the slide groove. The brake block is fixedly connected to the side wall of the transmission belt at one end close to the transmission belt, and a positioning roller is rotatably installed at the end of the brake block away from the transmission belt.

[0010] In a further embodiment, a load-bearing rod is fixedly mounted on one side of the transmission belt close to the brake block, and a counterweight block is fixedly mounted on the side wall of the load-bearing rod.

[0011] In a further embodiment, the mass of the counterweight block is not less than the sum of the masses of the positioning plate and the limiting plate.

[0012] In a further embodiment, the mass of the counterweight block is not less than the sum of the masses of the positioning plate and the limiting plate.

[0013] In a further embodiment, the transmission assembly includes a transmission roller and a sleeve, the inner cavity of the sliding groove is symmetrically provided with positioning grooves, the transmission roller is rotatably installed in the inner cavity of the positioning groove, and a transmission rod is fixedly installed in the middle of both ends of the transmission roller, the sleeve is slidably installed in the inner cavity of the positioning groove, and one end of the transmission rod away from the transmission roller is inserted into the inner cavity of the sleeve, and a return spring is fixedly installed on the side wall of the sleeve, and the other end of the return spring is fixedly connected to the inner wall of the positioning groove.

[0014] In a further embodiment, the transmission assembly also includes a guide plate and a brake roller, one end of the guide plate is fixedly connected to the upper end surface of the workbench, one end of the brake roller is rotatably connected to one side of the guide plate, a brake groove is provided on the side of the guide plate close to the brake roller, a connecting rod is slidably installed in the inner cavity of the brake groove, a pressure roller is fixedly installed on the end of the connecting rod away from the inner wall of the brake groove, an output device is fixedly installed on the side of the guide plate away from the brake roller, and one end of the output device is fixedly connected to one end of the brake roller.

[0015] In a further embodiment, a limit spring is fixedly mounted on the inner wall of the brake groove, and the other end of the limit spring is fixedly connected to the side wall of the connecting rod.

[0016] In a further embodiment, a rubber sleeve for protecting the protective film is fixedly mounted on the side wall of the positioning roller.

[0017] A method for unwinding a copper-aluminum profile surface coating, comprising the following steps:

[0018] A1. Insert one end of the protective film between the two transmission rollers. Under the action of the reset spring, the protective film can always provide pressing force. Then insert one end of the protective film inserted between the two transmission rollers between the pressure roller and the brake roller. Then start the output device, and the protective film rolled up outside the unwinding roller can slide, thereby coating the surface of the copper and aluminum profiles.

[0019] A2. As the thickness of the protective film on the outer wall of the unwinding roller continues to decrease, the brake block continues to slide in the inner cavity of the slide groove, so that the side wall of the positioning roller is always in contact with the side wall of the protective film. At this time, the transmission belt rotates continuously through the driving wheel and the driven wheel, and the rack plate slides continuously with the transmission belt, so that the gear can rotate along its own axis, and the positioning plate rotates synchronously with the continuous reduction of the protective film, so that the protective film between the sliding groove and the unwinding roller is always in a parallel state with the upper end surface of the workbench, thereby preventing the protective film from wrinkling when sliding.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention relates to an unwinding device for coating the surface of a copper-aluminum profile and a method for using the device. When the rear end of the protective film is continuously lowered, the brake block continuously slides in the inner cavity of the slide groove, so that the side wall of the positioning roller is always in contact with the side wall of the protective film. At this time, the transmission belt continuously rotates through the driving wheel and the driven wheel, so that the rack plate continuously slides with the transmission belt, and the gear can rotate along its own axis direction, so that the positioning plate can rotate synchronously with the continuous reduction of the protective film, so that the protective film between the sliding groove and the unwinding roller is always in a parallel state with the upper end surface of the workbench, so as to prevent the protective film from wrinkling when it slides, thereby solving the problem in the prior art that the protective film is prone to wrinkles when it slides continuously, resulting in loose adhesion between the protective film and the surface of the copper-aluminum profile, and avoiding the protective film and the copper-aluminum profile groove surface from easily falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0023] Figure 2 It is a schematic diagram of a half-section structure of a hollow support plate in the present invention;

[0024] Figure 3 It is a schematic diagram of a half-section structure of a limiting plate in the present invention;

[0025] Figure 4 For the present invention Figure 2 A magnified view of the structure at center A;

[0026] Figure 5 For the present invention Figure 2 A magnified view of the structure at B in the middle;

[0027] Figure 6 For the present invention Figure 3 A magnified view of the structure at C in the middle;

[0028] Figure 7 For the present invention Figure 1 Enlarged view of the structure at D in the middle.

[0029] In the figure: 1. hollow support plate; 2. positioning roller; 3. driving wheel; 4. brake block; 5. unwinding roller; 6. positioning plate; 7. limit plate; 8. guide plate; 9. brake roller; 10. driven wheel; 11. transmission belt; 12. support rod; 13. transmission roller; 14. load-bearing rod; 15. counterweight; 16. rack plate; 17. gear; 18. reset spring; 19. sleeve; 20. limit spring. DETAILED DESCRIPTION

[0030] The embodiments of the present application solve the problems raised in the prior art by providing a reeling device for coating the surface of copper and aluminum profiles and a method for using the same; the following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1

[0032] See also Figure 1-7 The present embodiment provides an unwinding device for coating the surface of copper and aluminum profiles and a method for using the same, comprising a workbench and a hollow support plate 1 and an unwinding roller 5 for unwinding, one end of the hollow support plate 1 is fixedly connected to the upper end surface of the workbench, wherein two hollow support plates 1 are symmetrically fixedly installed on the upper end surface of the workbench.

[0033] One end of the unwinding roller 5 is movably mounted on one side of the hollow support plate 1, and an anti-wrinkle component for preventing the protective film from wrinkling is arranged inside the hollow support plate 1, wherein the two hollow support plates 1 can support the unwinding roller 5, so as to improve the stability of the unwinding roller 5 during operation, so as to improve the stability and convenience of coating the surface of the copper and aluminum profiles.

[0034] The anti-wrinkle component includes a positioning plate 6 and a limiting plate 7. A support rod 12 is rotatably installed on the side of the hollow support plate 1 away from the unwinding roller 5. The end of the support rod 12 away from the hollow support plate 1 is fixedly connected to one side of the positioning plate 6, wherein the support rod 12 can support the positioning plate 6 so as to improve the rotation stability of the positioning plate 6. At the same time, when the positioning plate 6 is rotated to the side close to the workbench and is parallel to the upper end surface of the workbench, the side of the positioning plate 6 away from the workbench and the highest point of the protective film rolled up on the side wall of the unwinding roller 5 are flush with each other.

[0035] One end of the limiting plate 7 is rotatably connected to the side of the positioning plate 6 close to the hollow supporting plate 1, and a sliding groove for sliding the protective film is opened at the end of the limiting plate 7 away from the positioning plate 6. When coating the surface of the copper and aluminum profiles, one end of the protective film needs to be inserted into the inner cavity of the sliding groove. As the surface of the steel and aluminum profiles is continuously coated, the protective film will continue to slide in the inner cavity of the sliding groove, which serves the purpose of initially limiting the sliding trajectory of the protective film.

[0036] The anti-wrinkle component also includes a driving wheel 3 and a driven wheel 10, one end of the driving wheel 3 and one end of the driven wheel 10 are both rotatably connected to the side wall of the hollow support plate 1, and the side wall of the driving wheel 3 is rotatably installed with a transmission belt 11 for being rotatably connected to the side wall of the driven wheel 10, wherein the driving wheel 3 and the driven wheel 10 can support the transmission belt 11 so that the driving wheel 3 and the driven wheel 10 can slide synchronously along their own axial direction, thereby improving the stability and convenience of the rotation of the transmission belt 11.

[0037] A gear 17 is fixedly installed at one end of the support rod 12 away from the positioning plate 6, and a rack plate 16 meshing with the gear 17 is fixedly installed on the side wall of the transmission belt 11 close to the driving wheel 3. A transmission component for reducing the sliding resistance of the protective film is provided on the upper end surface of the workbench. When the surface of the copper-aluminum profile is continuously coated, the thickness of the protective film on the outer wall of the unwinding roller 5 is continuously reduced, and then the transmission belt 11 is rotated to allow the rack plate 16 to slide continuously with the transmission belt 11, so that the gear 17 can rotate along its own axial direction, so that the positioning plate 6 can rotate synchronously with the continuous reduction of the protective film, so that the protective film between the sliding groove and the unwinding roller 5 is always in a parallel state with the upper end surface of the workbench, thereby preventing the protective film from wrinkling when it slides, solving the problem that the protective film is prone to wrinkles when it slides continuously in the prior art, resulting in loose adhesion between the protective film and the surface of the copper-aluminum profile, and avoiding the protective film and the copper-aluminum groove surface from easily falling off.

[0038] A slide groove connected to the inner cavity of the hollow support plate 1 is provided on one side close to the unwinding roller 5, and a brake block 4 is slidably installed in the inner cavity of the slide groove. The slide groove can limit the sliding trajectory of the brake block 4 so as to improve the sliding stability of the brake block 4.

[0039] One end of the brake block 4 close to the transmission belt 11 is fixedly connected to the side wall of the transmission belt 11, and the end of the brake block 4 away from the transmission belt 11 is rotatably installed with a positioning roller 2, wherein the brake block 4 can slide synchronously with the transmission belt 11, and at the same time, when the brake block 4 is in the initial position, the brake block 4 fits with the bottom of the slide groove under the action of gravity, and when the unwinding roller 5 is installed to one side of the hollow support plate 1, the side wall of the positioning roller 2 fits with the side wall of the protective film, and as the thickness of the protective film continues to decrease, the brake block 4 can slide in the inner cavity of the slide groove, and then the positioning plate 6 can be rotated, thereby improving the convenience of rotating the positioning plate 6.

[0040] A load-bearing rod 14 is fixedly installed on one side of the transmission belt 11 close to the brake block 4, and a counterweight block 15 is fixedly installed on the side wall of the load-bearing rod 14. The counterweight block 15 can increase the weight on one side of the transmission belt 11 to facilitate the transmission belt 11 to rotate through the driving wheel 3 and the driven wheel 10, thereby improving the tightness of the fit between the side wall of the positioning roller 2 and the side wall of the protective film, preventing slipping between the positioning roller 2 and the protective film, protecting the side wall of the protective film, and preventing the side wall of the protective film from breaking.

[0041] The mass of the counterweight block 15 is not less than the sum of the masses of the positioning plate 6 and the limit plate 7, which prevents the positioning plate 6 and the limit plate 7 from being too heavy and causing the transmission belt 11 to rotate, avoids the separation between the side wall of the positioning roller 2 and the side wall of the protective film, and further improves the tightness of the fit between the side wall of the positioning roller 2 and the side wall of the protective film.

[0042] A torsion spring is fixedly installed inside the positioning plate 6, and the other end of the torsion spring is fixedly connected to one end of the limit plate 7. The torsion spring can allow the limit plate 7 to always be located on the same horizontal plane with the side away from the unwinding roller 5 and the end of the positioning plate 6 away from the support rod 12 without being affected by external forces, so as to facilitate the resetting of the limit plate 7. With the continuous rotation of the positioning plate 6, the side wall of the sliding groove and the upper end surface of the protective film are fitted, and then the limit plate 7 is rotated to reduce the friction between the side wall of the protective film and prevent the protective film from breaking.

[0043] Furthermore, the distance between one end of the rack plate 16 and the driving wheel 3 is not less than the height of the slide slot, so as to prevent one end of the rack plate 16 from contacting the side wall of the driving wheel 3 when the transmission belt 11 rotates, thereby avoiding affecting the rotation of the transmission belt 11.

[0044] Embodiment 2

[0045] See also Figure 1-7 , further improvements were made on the basis of Example 1:

[0046] The transmission assembly includes a transmission roller 13 and a sleeve 19. The inner cavity of the sliding groove is symmetrically provided with positioning grooves. The transmission roller 13 is rotatably installed in the inner cavity of the positioning groove, and a transmission rod is fixedly installed in the middle of both ends of the transmission roller 13. The sleeve 19 is slidably installed in the inner cavity of the positioning groove, and the end of the transmission rod away from the transmission roller 13 is inserted into the inner cavity of the sleeve 19, wherein the positioning groove can provide a sliding trajectory for the sliding of the transmission roller 13, so as to limit the sliding trajectory of the transmission roller 13, thereby improving the sliding stability of the transmission roller 13.

[0047] A return spring 18 is fixedly installed on the side wall of the sleeve 19, and the other end of the return spring 18 is fixedly connected to the inner wall of the positioning groove, wherein the sleeve 19 can prevent one end of the return spring 18 from directly contacting the side wall of the transmission rod, thereby preventing the rotation of the transmission roller 13 from being affected. At the same time, the return spring 18 can provide the transmission roller 13 with a continuous sliding direction away from the inner wall of the positioning groove, so that the side walls of the two transmission rollers 13 are always in contact, thereby reducing the friction during the sliding process of the protective film, making the protective sliding smoother.

[0048] The transmission assembly also includes a guide plate 8 and a brake roller 9. One end of the guide plate 8 is fixedly connected to the upper end surface of the workbench, and one end of the brake roller 9 is rotatably connected to one side of the guide plate 8. A brake groove is provided on the side of the guide plate 8 close to the brake roller 9. A connecting rod is slidably installed in the inner cavity of the brake groove, and a pressure roller is fixedly installed on the end of the connecting rod away from the inner wall of the brake groove, wherein the brake groove can limit the sliding trajectory of the connecting rod so that the side wall of the brake roller 9 and the side wall of the pressure roller are in a fit state in real time.

[0049] Among them, one end of the protective film is inserted between the brake roller 9 and the pressure roller. Under the action of the pressure roller, real-time pressure can be provided to the end face of the protective film. Then, by rotating the brake roller 9, the protective film can slide, thereby improving the convenience of the protective film being detached from the outer wall of the unwinding roller 5.

[0050] An output device is fixedly installed on the side of the guide plate 8 away from the brake roller 9, and one end of the output device is fixedly connected to one end of the brake roller 9, wherein the output device is composed of a transmission motor, and the power output end of the output device is fixedly connected to the middle part of one end of the brake roller 9 to provide a power source for the rotation of the brake roller 9, thereby improving the convenience of the brake roller 9 rotating along itself.

[0051] A limit spring 20 is fixedly installed on the inner wall of the brake groove, and the other end of the limit spring 20 is fixedly connected to the side wall of the connecting rod. The limit spring 20 can provide a thrust to the pressure roller to continuously slide toward the brake roller 9, so as to improve the tightness of the fit between the pressure roller and the brake roller 9, avoid idling when the pressure roller and the brake roller 9 rotate, and thereby improve the sliding stability of the protective film.

[0052] A rubber sleeve for protecting the protective film is fixedly installed on the side wall of the positioning roller 2, wherein the inner wall diameter of the rubber sleeve is the same as the diameter of the positioning roller (2), so as to avoid a gap between the inner wall of the rubber sleeve and the side wall of the positioning roller 2, which would cause wrinkles when the positioning roller 2 rotates. At the same time, the rubber sleeve can provide a soft connection between the positioning roller 2 and the protective film, thereby achieving the purpose of protecting the protective film.

[0053] Furthermore, the rubber sleeve can increase the friction between the positioning roller 2 and the protective film to prevent slipping between the positioning roller 2 and the protective film, so as to improve the rotation stability of the positioning roller 2 and prevent slipping between the protective film and the positioning roller 2, which may cause the protective film to tear.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A reeling device for coating the surface of a copper and aluminum profile, comprising a workbench and a hollow support plate (1) and a reeling roller (5) for reeling, wherein one end of the hollow support plate (1) is fixedly connected to the upper end surface of the workbench, and one end of the reeling roller (5) is movably mounted on one side of the hollow support plate (1), characterized in that: An anti-wrinkle component for preventing the protective film from wrinkling is arranged inside the hollow support plate (1); The anti-wrinkle component comprises a positioning plate (6) and a limiting plate (7); a support rod (12) is rotatably mounted on a side of the hollow support plate (1) away from the unwinding roller (5); an end of the support rod (12) away from the hollow support plate (1) is fixedly connected to a side of the positioning plate (6); one end of the limiting plate (7) is rotatably connected to a side of the positioning plate (6) close to the hollow support plate (1); and a sliding groove for sliding the protective film is provided at one end of the limiting plate (7) away from the positioning plate (6); The anti-wrinkle component further comprises a driving wheel (3) and a driven wheel (10), one end of the driving wheel (3) and one end of the driven wheel (10) are both rotatably connected to the side wall of the hollow support plate (1), a transmission belt (11) rotatably mounted on the side wall of the driving wheel (3) for being rotatably connected to the side wall of the driven wheel (10), a gear (17) is fixedly mounted on one end of the support rod (12) away from the positioning plate (6), a rack plate (16) meshing with the gear (17) is fixedly mounted on the side wall of the transmission belt (11) close to the driving wheel (3), and a transmission component for reducing the sliding resistance of the protective film is arranged on the upper end surface of the workbench, and the hollow A slide groove connected to the inner cavity of the support plate (1) is provided on one side of the support plate (1) close to the unwinding roller (5), a brake block (4) is slidably installed in the inner cavity of the slide groove, one end of the brake block (4) close to the transmission belt (11) is fixedly connected to the side wall of the transmission belt (11), and a positioning roller (2) is rotatably installed on the end of the brake block (4) away from the transmission belt (11), a bearing rod (14) is fixedly installed on the side of the transmission belt (11) close to the brake block (4), and a counterweight block (15) is fixedly installed on the side wall of the bearing rod (14), and a torsion spring is fixedly installed inside the positioning plate (6), and the other end of the torsion spring is connected to one end of the limit plate (7). The transmission assembly comprises a transmission roller (13) and a sleeve (19), the inner cavity of the sliding groove is symmetrically provided with positioning grooves, the transmission roller (13) is rotatably mounted in the inner cavity of the positioning groove, and a transmission rod is fixedly mounted in the middle of both ends of the transmission roller (13), the sleeve (19) is slidably mounted in the inner cavity of the positioning groove, and one end of the transmission rod away from the transmission roller (13) is inserted into the inner cavity of the sleeve (19), a return spring (18) is fixedly mounted on the side wall of the sleeve (19), and the other end of the return spring (18) is fixedly connected to the inner wall of the positioning groove, and the transmission assembly also comprises a guide plate (8) and a brake roller (9). One end of the guide plate (8) is fixedly connected to the upper end surface of the workbench, one end of the brake roller (9) is rotatably connected to one side of the guide plate (8), a brake groove is provided on the side of the guide plate (8) close to the brake roller (9), a connecting rod is slidably installed in the inner cavity of the brake groove, a pressure roller is fixedly installed on the end of the connecting rod away from the inner wall of the brake groove, an output device is fixedly installed on the side of the guide plate (8) away from the brake roller (9), one end of the output device is fixedly connected to one end of the brake roller (9), a limit spring (20) is fixedly installed on the inner wall of the brake groove, and the other end of the limit spring (20) is fixedly connected to the side wall of the connecting rod.

2. The unwinding device for coating the surface of copper and aluminum profiles according to claim 1 is characterized in that: The mass of the counterweight block (15) is not less than the sum of the masses of the positioning plate (6) and the limiting plate (7).

3. The unwinding device for coating the surface of copper and aluminum profiles according to claim 2 is characterized in that: A rubber sleeve for protecting the protective film is fixedly mounted on the side wall of the positioning roller (2).

4. An unwinding method of an unwinding device for coating the surface of copper and aluminum profiles according to claim 3, characterized in that: The steps include: A1. Insert one end of the protective film between the two transmission rollers (13). Under the action of the return spring (18), the protective film can always be pressed. Then, insert one end of the protective film inserted between the two transmission rollers (13) between the pressure roller and the brake roller (9). Then, start the output device to allow the protective film wound on the outside of the unwinding roller (5) to slide, thereby coating the surface of the copper and aluminum profiles. A2. As the thickness of the protective film on the outer wall of the unwinding roller (5) decreases, the brake block (4) slides continuously in the inner cavity of the slide groove, so that the side wall of the positioning roller (2) always fits the side wall of the protective film. At this time, the transmission belt (11) rotates continuously through the driving wheel (3) and the driven wheel (10), so that the rack plate (16) slides continuously with the transmission belt (11), so that the gear (17) rotates along its own axis, and the positioning plate (6) rotates synchronously with the continuous reduction of the protective film, so that the protective film between the sliding groove and the unwinding roller (5) is always in a parallel state with the upper end surface of the workbench, thereby preventing the protective film from wrinkling when sliding.

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