Film pasting device with rolling wheel integrated on upper cover

Abstract

The utility model relates to the technical field of film pasting devices, in particular to a film pasting device with a rolling wheel integrated on an upper cover, which is used for assisting a protective film to be attached to a screen to be pasted with a film and comprises a base and the upper cover covering the base in a positioning mode, and a positioning groove used for positioning the screen to be pasted with the film is formed in the base. The upper cover is slidably connected with a rolling assembly used for rolling and attaching the protective film to a screen to be pasted with the film, the rolling assembly comprises a sliding body and a rolling wheel rotationally connected to the lower end of the sliding body, the two ends of the sliding body are each provided with an elastic hoop structure, and the sliding body can be installed in the guide rail in the normal direction of the upper cover in the assembling process. The assembly mode is simple, and the two elastic hoop structures are matched with the guide rails, so that the two elastic hoop structures can abut against each other in multiple directions after butt joint, the assembled sliding main body and the upper cover do not shake, the firmness and stability of assembly are guaranteed, and the service life of the sliding main body is prolonged. And the effect of rolling the protective film and the use experience feeling of a user are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of film applicators, in particular to a film applicator with a rolling wheel integrated on an upper cover. Background Art

[0002] The film applicator is an auxiliary tool used to apply tempered film to mobile phones and other devices more conveniently and accurately; it usually has the following features and functions: Precise positioning: helps ensure that the tempered film can be accurately attached to the screen to avoid problems such as crooked attachment or bubbles. Easy operation: makes the film application process relatively easy, even non-professionals can complete the film application well. Protective effect: during the film application process, it can protect the screen to a certain extent and prevent accidental scratches or damage; different types of film applicators may have different designs, but the purpose is to improve the efficiency and effect of film application.

[0003] For example, a film pasting device and a film pasting set device described in the utility model patent authorization announcement number CN218535634U combine the upper cover and the base cover into a whole, and align the film with the device to be pasted with the film through a positioning structure, and then the film is squeezed by dragging the pressing shaft through the exposed force-applying part. During operation, only the force-applying part needs to be pulled and dragged to complete the entire film pasting process.

[0004] Another example is the film laminating machine described in the invention patent application publication number CN110126248A. After the protective film is installed on the positioning mechanism and the cover body is rotated and covered on the base, the protective film is pushed along the film laminating direction by a pushing component so that the protective film is gradually laminated to the electronic device. The operation is simple, the film laminating quality is high, and the versatility is strong.

[0005] Generally speaking, the prior art more or less applies a pushable film pressing structure, and adopts an upper cover structure, assembling the film pressing structure on the upper cover structure, so that the user can press down to make the protective film be exhausted and applied in an orderly manner from one end to the other end. This film application method is not only efficient, but also has a much better film application effect than manual film application. In addition, the film pressing structure is assembled on the upper cover, which can also facilitate the positioning and placement of the screen to be filmed, that is, the screen to be filmed is basically positioned and placed on the base, and compared with some structures in which the film pressing structure is directly set on the base, the overall length of the film applicator is also reduced, because the film pressing structure set on the base will hinder the positioning of the screen to be filmed or the protective film, so a certain position will be reserved for placing the film pressing structure; therefore, setting the film pressing structure on the upper cover will reduce the overall size of the film applicator, thereby reducing packaging costs and transportation costs;

[0006] However, this type of film applicator still has some defects in the setting of the film pressing structure. For example, during the assembly process, the body of the film pressing structure and the slide groove are generally assembled by a snap-fitting method. The slide grooves are generally arranged on both sides of the film pressing structure. The direction in which the film pressing structure is snapped in is not perpendicular to the direction of the slide groove. Generally, a large force is required to achieve snap-fitting and fixing. Alternatively, the snap-fitting is easy but the film pressing structure and the slide groove are loose after assembly, resulting in poor use effect, which affects the user experience. Some film applicator products that are firmly and reliably made and the way the film pressing structure and the slide groove are assembled without a snap-fitting structure have a large number of parts, thereby increasing the complexity of assembly. In this regard, with regard to how to facilitate the assembly of the film pressing structure on the upper cover and make the film pressing structure more firm and stable after assembly, it is necessary to propose a technical means to solve this problem. Utility Model Content

[0007] The utility model aims to overcome the above-mentioned shortcomings and provide a technical solution that can solve the above-mentioned problems.

[0008] A film applicator with a rolling wheel integrated on an upper cover is used to assist in attaching a protective film to a screen to be pasted with the film. The film applicator comprises a base and an upper cover positioned on the base, wherein a positioning groove for positioning the screen to be pasted with the film is provided on the base, and a rolling assembly for rolling the protective film onto the screen to be pasted with the film is slidably connected to the upper cover. The rolling assembly comprises a sliding body and a rolling wheel rotatably connected to the lower end of the sliding body, and elastic clamp structures are respectively provided at both ends of the sliding body, and the elastic clamp structure has a one-way clamping portion. The upper cover is provided with a guide track docked with the elastic clamp structure, and the guide track has a limiting groove. The sliding body is slidably matched with the upper cover guide through the docking of the elastic clamp structure and the guide track, and the sliding body is clamped into the limiting groove through the one-way clamping portion to restrict the sliding body to the guide track.

[0009] Preferably, the elastic clamp structure has a curved sheet structure extending along both ends of the sliding body, and a U-shaped groove structure capable of holding the guide rail is formed between the curved sheet structure and the end of the sliding body. The curved sheet structure is configured to be elastically deformable so that the one-way clamping part can be clamped into the limit groove in its elastically deformed state.

[0010] Preferably, the guide rail has a straight edge formed at the lower end of the upper cover and a spherical edge formed at the lower end of the straight edge, the thickness of the spherical edge is greater than that of the straight edge, and the upper end of the spherical edge is a flat surface, so that a limiting groove is formed between the straight edge and the spherical edge.

[0011] Preferably, the one-way clip is formed on the inner side of the U-shaped groove structure and corresponds to the end position of the sliding body. The upper part of the one-way clip is an inclined surface, and the lower part of the one-way clip is a straight surface. After the one-way clip is inserted into the limiting groove, the lower part of the one-way clip is against the upper part of the spherical edge.

[0012] Preferably, a snap-in notch is provided at one end of the spherical edge, a protrusion flush with the upper end surface of the spherical edge is formed on the snap-in notch, and the lower end of the protrusion is an inclined surface.

[0013] Preferably, a receiving groove is provided at the lower end of the sliding body, and major arc notches are respectively opened at both ends of the receiving groove, the rolling wheel is placed in the receiving groove, and the lower end of the rolling wheel protrudes from the receiving groove, and rotating shafts are provided at both ends of the rolling wheel, the rotating shafts are snap-fitted with the major arc notches, and the rotating shafts can rotate in the major arc notches.

[0014] Preferably, a window structure for operating the sliding body is provided at the upper end of the upper cover, the window structure is a long strip structure, and the window structure corresponds to the length of the positioning groove.

[0015] Preferably, a handle portion is flipably connected to the upper end of the sliding body, and the handle portion can be flipped along the window structure to the top of the upper cover.

[0016] Preferably, the handle portion has extension portions on both sides, and the two side edges of the window structure at one end are provided with step portions matching the extension portions, so that the handle portion can be flushly positioned on the upper cover through the docking of the extension portion and the step portion; and a plurality of protrusions are also formed on the wall surface of the extension portion, and the protrusions can abut against the step portion to generate a damping fit between the handle and the step portion.

[0017] Preferably, an upper protecting fixing structure is provided on the base or the upper cover corresponding to the front and rear positions of the positioning groove, and the film applicator also includes an upper protecting sheet for attaching the positioning protective film, the upper protecting sheet is fixed to the base or the upper cover by the upper protecting fixing structure, and the upper protecting sheet abuts against the lower end of the rolling assembly.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The utility model adopts two methods, namely, clamping and clamping, to guide and connect the sliding body to the guide rail, and the elastic clamp structure adopts a structure setting capable of generating elastic deformation, so that the elastic deformation generated by the elastic clamp structure can play a transition role in the process of the one-way clamping part being clamped into the limiting groove, so that the one-way clamping part can be easily clamped into the limiting groove;

[0020] By adopting the cooperation mode of the guide track and the elastic clamp structure, the slide can be installed in the guide track along the normal direction of the upper cover during the assembly process. The assembly method is simple, and the cooperation of the two elastic clamp structures and the guide track can produce multiple directions of tight contact between the two after docking, so that the assembled sliding body and the upper cover will not shake, thereby ensuring the firmness and stability of the assembly, improving the effect of the rolling protective film and the user's experience;

[0021] The elastic clamp structure and the guide rail can be integrally formed with the sliding body and the upper cover respectively, thereby minimizing the number of parts of the film applicator and reducing the production and assembly cost of the film applicator.

[0022] The rolling assembly is integrated on the upper cover, and the positioning groove is set on the base, so that the positioning of the screen to be film-applied will not be interfered with or hindered by the rolling assembly, and the film applicator does not need to reserve a position to place the rolling assembly; the size of the film applicator can be set smaller, thereby effectively reducing packaging costs and transportation costs.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 It is a structural schematic diagram of the utility model;

[0026] Figure 2 It is a schematic diagram of the exploded structure of the utility model and the protective film and the screen to be filmed;

[0027] Figure 3 It is a structural schematic diagram of the upper cover and the rolling assembly in the utility model;

[0028] Figure 4 It is another structural schematic diagram of the upper cover and the rolling assembly in the utility model;

[0029] Figure 5 It is a partial structural schematic diagram of the upper cover and the rolling assembly in the utility model;

[0030] Figure 6 It is a schematic diagram of a cross-sectional structure of the upper cover and the rolling assembly in the utility model;

[0031] Figure 7 It is another schematic diagram of the cross-sectional structure of the upper cover and the rolling assembly in the utility model;

[0032] Figure 8 This utility model Figure 6 The structural diagram at A in the middle;

[0033] Fig. 9 This utility model Figure 7 The structural diagram at B in the middle;

[0034] Fig.10 It is a structural schematic diagram of the rolling assembly in the utility model;

[0035] Fig.11 It is a schematic diagram of the exploded structure of the rolling component in the utility model.

[0036] The reference numerals and names in the figures are as follows:

[0037] Protective film 1, screen to be pasted with film 2, base 10, positioning groove 11, upper protective fixing structure 12, upper cover 20, guide rail 21, straight edge 211, spherical edge 212, snap-in notch 213, raised portion 214, limiting groove 22, window structure 23, step portion 231, rolling assembly 30, sliding body 31, accommodating groove 311, superior arc notch 312, rolling wheel 32, rotating shaft 321, elastic clamp structure 33, curved sheet structure 331, U-shaped groove structure 332, yielding opening 333, one-way clamping portion 34, handle portion 35, extension portion 351, convex point 352, upper protective sheet 40. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a 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.

[0039] See also Figure 1-11In the embodiment of the utility model, a film applicator with a rolling wheel integrated on the upper cover can be used to assist in attaching the protective film 1 to a product with a screen such as a mobile phone, which is collectively referred to as the screen to be filmed 2 below. The technical solution of the utility model includes a base 10 and an upper cover 20 positioned and covered on the base 10. A positioning groove 11 for positioning the screen to be filmed 2 is provided on the base 10. A rolling assembly 30 for rolling and attaching the protective film 1 to the screen to be filmed 2 is slidably connected on the upper cover 20. When in use, the screen to be filmed 2 is positioned and placed in the positioning groove 11, and then the protective film 1 with the torn release film is positioned and placed on the screen to be filmed 2. In order to enable the protective film 1 to be accurately aligned with the screen to be filmed 2 and to maintain a clearance fit between the protective film 1 and the screen to be filmed 2 before the protective film 1 is pressed down, the base 10 or the upper cover 20 can be provided with an upper protective fixing structure 12 corresponding to the front and rear positions of the positioning groove 11, and the film can be applied. The device also includes an upper protection sheet 40 for attaching and positioning the protective film 1. The upper protection sheet 40 is fixed to the base 10 or the upper cover 20 through the upper protection fixing structure 12, and the upper protection sheet 40 abuts against the lower end of the rolling assembly 30; if the upper protection sheet 40 is set on the base 10, it is necessary to add a lifting structure to leave a certain gap between the protective film 1 and the screen 2 to be attached after positioning; after the screen 2 to be attached and the upper protection sheet 40 are fixed, the screen 2 to be attached, the protective film 1 and the rolling assembly 30 are in a pre-filming state by closing the upper cover 20, and then the rolling assembly 30 is pushed to roll the rolling assembly 30 from one end of the protective film 1 to the other end of the protective film 1. During this operation, the protective film 1 will be pressed down to attach to the screen 2 to be attached, and the protective film 1 can be attached to the screen 2 to be attached in an orderly manner from one end to the other end during the rolling process, so that no bubbles will be generated between the attached screen 2 to be attached and the protective film 1;

[0040] On this basis, the technical solution of the utility model mainly improves and improves the structure of the rolling assembly 30. Specifically, the rolling assembly 30 includes a sliding body 31 and a rolling wheel 32 rotatably connected to the lower end of the sliding body 31. Elastic clamp structures 33 are respectively provided at both ends of the sliding body 31. The elastic clamp structure 33 has a one-way clamping portion 34. The upper cover 20 is provided with a guide rail 21 docked with the elastic clamp structure 33. The guide rail 21 has a limiting groove 22. The sliding body 31 is guided and slidably cooperated with the upper cover 20 through the docking of the elastic clamp structure 33 and the guide rail 21, and the sliding body 31 is clamped into the limiting groove 22 through the one-way clamping portion 34 to limit the sliding body 31 on the guide rail 21.

[0041] That is, the utility model guides and connects the sliding body 31 to the guide rail 21 by adopting two methods, namely, clamping and clamping, and the elastic clamp structure 33 adopts a structure setting that can generate elastic deformation, so that the elastic deformation generated by the elastic clamp structure 33 can play a transition role in the process of the one-way clamping part 34 being clamped into the limiting groove 22, so that the one-way clamping part 34 can be easily clamped into the limiting groove 22, and by adopting the matching method of the guide rail 21 and the elastic clamp structure 33, the slide can be installed in the guide rail along the normal direction of the upper cover 20 during the assembly process. 21, its assembly method is simple, and the cooperation of the two elastic clamp structures 33 and the guide rail 21 can generate multiple directions of tight contact between the two after docking, so that there will be no shaking between the assembled sliding body 31 and the upper cover 20, thereby ensuring the firmness and stability of the assembly, improving the effect of the rolled protective film 1 and the user's experience; in the structural setting of the elastic clamp structure 33 and the guide rail 21, they can be integrally formed with the sliding body 31 and the upper cover 20 respectively, thereby minimizing the number of parts of the film applicator and reducing the production and assembly cost of the film applicator.

[0042] See also Figure 4-11 In the embodiment of the utility model, the elastic clamp structure 33 is further defined as having a curved sheet structure 331 extending along both ends of the sliding body 31, and a U-shaped groove structure 332 capable of holding the guide rail 21 is formed between the curved sheet structure 331 and the end of the sliding body 31, and the curved sheet structure 331 is configured to be elastically deformable so that the one-way clamping portion 34 can be clamped into the limiting groove 22 in its elastically deformed state; that is, the utility model utilizes the elastic deformation characteristics of the sheet structure itself, and configures this sheet structure to be able to bend to form a U-shaped groove structure 332, thereby forming an elastic clamp structure 33 to wrap around the guide rail 21, and then utilizes the elastic deformation that can be generated to enable the one-way clamping portion 34 to be smoothly clamped into the limiting groove 22 during the assembly process, thereby completing the sliding body 31 and The upper cover 20 is assembled and matched; its structural design is simple, and no excessive local force will be caused during the assembly process, and the sliding body 31 can slide smoothly along the guide track 21 after the assembly is completed; the guide track 21 is arranged to have a straight edge 211 formed at the lower end of the upper cover 20 and a spherical edge 212 formed at the lower end of the straight edge 211, the thickness of the spherical edge 212 is greater than that of the straight edge 211, and the upper end of the spherical edge is a flat surface, so that a limiting groove 22 is formed between the straight edge 211 and the spherical edge 212; during the assembly process, the one-way clamping portion 34 first abuts against the spherical edge 212, so that the curved sheet structure 331 produces elastic deformation, and the one-way clamping portion 34 can overcome the obstruction of the spherical edge 212 and finally be clamped into the limiting groove 22, thereby being supported on the spherical edge 212, so that the rolling assembly 30 will not fall down.

[0043] Furthermore, the one-way clamping portion 34 is formed on the inner side of the U-shaped groove structure 332 and corresponds to the end position of the sliding body 31. The upper part of the one-way clamping portion 34 is an inclined surface, and the lower part of the one-way clamping portion 34 is a flat surface. After the one-way clamping portion 34 is inserted into the limiting groove 22, the lower part of the one-way clamping portion 34 abuts against the upper part of the spherical edge 212; a clearance opening 333 is provided at the lower end of the curved sheet structure 331, and the clearance opening 333 is directly opposite to the lower part of the one-way clamping portion 34; the setting of the clearance opening 333 can facilitate the injection molding of the one-way clamping portion 34, and the setting of the clearance opening 333 can also improve the deformation effect of the curved sheet structure 331; further, as Figure 7 and Fig. 9 As shown, a snap-in notch 213 is provided at one end of the spherical edge 212, and a protrusion 214 flush with the upper end surface of the spherical edge 212 is formed on the snap-in notch 213, and the lower end of the protrusion 214 is an inclined surface. Through this arrangement, the one-way snap-in portion 34 can be more smoothly snapped into the limiting groove 22, thereby further improving the assembly between the rolling assembly 30 and the upper cover 20.

[0044] See also Fig.11 In the embodiment of the utility model, a receiving groove 311 is provided at the lower end of the sliding body 31, and major arc notches 312 are respectively opened at both ends of the receiving groove 311, the rolling wheel 32 is placed in the receiving groove 311, and the lower end of the rolling wheel 32 protrudes from the receiving groove 311, and a rotating shaft 321 is provided at both ends of the rolling wheel 32, the rotating shaft 321 is snap-fitted with the major arc notch 312, and the rotating shaft 321 can rotate in the major arc notch 312; through this arrangement, the overall structure of the rolling assembly 30 is arranged to be more compact, and the rolling wheel 32 is assembled by using the major arc notch 312 to snap-fit ​​the rotating shaft 321, so that the assembly between the rolling wheel 32 and the sliding body 31 is more convenient.

[0045] See also Figure 1-4In the embodiment of the utility model, a window structure 23 for operating the sliding body 31 is provided at the upper end of the upper cover 20. The window structure 23 is a long strip structure, and the window structure 23 corresponds to the length of the positioning groove 11. The operator can operate the rolling assembly 30 assembled at the lower end of the upper cover 20 through the window structure 23; and further, a handle portion 35 is flipably connected to the upper end of the sliding body 31, and the handle portion 35 can be flipped along the window structure 23 to the top of the upper cover 20, so that the operator can push the sliding body 31. In addition, extensions 351 are provided on both sides of the handle portion 35, and both side edges of the window structure 23 at one end are provided with step portions 231 matching the extension portions 351, so that the handle portion 35 can be flushly positioned on the upper cover 20 through the docking of the extension portion 351 and the step portion 231; and a plurality of protrusions 352 are also formed on the wall surface of the extension portion 351, and the protrusions 352 can abut against the step portion 231 to generate a damping fit between the handle and the step portion. Through this arrangement, the handle can be kept fixed on the upper cover 20 when not in use, such as during packaging and transportation, thereby avoiding sliding between the rolling assembly 30 and the upper cover 20 when not in use, and the step portion and the extension portion 351 on the handle are used for positioning and matching, so that the handle can be flushly embedded in the upper cover 20, so that the upper cover 20 can be kept flat.

[0046] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A film applicator with a rolling wheel integrated on an upper cover, used to assist in attaching a protective film to a screen to be filmed, comprising a base and an upper cover positioned on the base, a positioning groove for locating the screen to be filmed is provided on the base, and a rolling assembly for rolling the protective film onto the screen to be filmed is slidably connected to the upper cover, characterized in that: The rolling assembly includes a sliding body and a rolling wheel rotatably connected to the lower end of the sliding body, elastic clamp structures are respectively provided at both ends of the sliding body, the elastic clamp structure has a one-way clamping portion, the upper cover is provided with a guide track docked with the elastic clamp structure, and the guide track is provided with a limiting groove. The sliding body cooperates with the upper cover guide sliding through the docking of the elastic clamp structure and the guide track, and the sliding body is clamped into the limiting groove through the one-way clamping portion to limit the sliding body on the guide track.

2. The film applicator with a rolling wheel integrated on the upper cover according to claim 1, characterized in that: The elastic clamp structure has a curved sheet structure extending along both ends of the sliding body, and a U-shaped groove structure capable of holding the guide rail is formed between the curved sheet structure and the end of the sliding body. The curved sheet structure is configured to be elastically deformable so that the one-way clamping part can be clamped into the limit groove in its elastically deformed state.

3. The film applicator with a rolling wheel integrated on the upper cover according to claim 2, characterized in that: The guide rail has a straight edge formed at the lower end of the upper cover and a spherical edge formed at the lower end of the straight edge. The thickness of the spherical edge is greater than that of the straight edge, and the upper end of the spherical edge is flat, so that a limiting groove is formed between the straight edge and the spherical edge.

4. The film applicator with a rolling wheel integrated on the upper cover according to claim 3, characterized in that: The one-way clamping part is formed on the inner side of the U-shaped groove structure and corresponds to the end position of the sliding body. The upper part of the one-way clamping part is an inclined surface, and the lower part of the one-way clamping part is a straight surface. After the one-way clamping part is inserted into the limiting groove, the lower part of the one-way clamping part is against the upper part of the spherical edge.

5. The film applicator with a rolling wheel integrated on the upper cover according to claim 4, characterized in that: A snap-in notch is provided at one end of the spherical edge, a convex portion flush with the upper end surface of the spherical edge is formed on the snap-in notch, and the lower end of the convex portion is an inclined surface.

6. The film applicator with a rolling wheel integrated on an upper cover according to claim 1, characterized in that: A receiving groove is provided at the lower end of the sliding body, and major arc notches are respectively opened at both ends of the receiving groove. The rolling wheel is placed in the receiving groove, and the lower end of the rolling wheel protrudes from the receiving groove. A rotating shaft is provided at both ends of the rolling wheel. The rotating shaft is engaged with the major arc notch, and the rotating shaft can rotate in the major arc notch.

7. The film applicator with a rolling wheel integrated on an upper cover according to claim 1, characterized in that: A window structure for operating the sliding body is arranged at the upper end of the upper cover. The window structure is a long strip structure, and the window structure corresponds to the length of the positioning groove.

8. The film applicator with a rolling wheel integrated on an upper cover according to claim 7, characterized in that: A handle portion is flipably connected to the upper end of the sliding body, and the handle portion can be flipped to the top of the upper cover along the window structure.

9. The film applicator with a rolling wheel integrated on an upper cover according to claim 8, characterized in that: There are extensions on both sides of the handle, and the two side edges of the window structure at one end are provided with step portions matching the extension portions, so that the handle can be flushly positioned on the upper cover through the docking of the extension portion and the step portion; and a plurality of protrusions are also formed on the wall surface of the extension, and the protrusions can abut against the step portion to generate a damping fit between the handle and the step portion.

10. The film applicator with a rolling wheel integrated on an upper cover according to claim 1, characterized in that: An upper protection fixing structure is provided on the base or the upper cover corresponding to the front and rear positions of the positioning groove. The film applicator also includes an upper protection sheet for attaching the positioning protective film. The upper protection sheet is fixed to the base or the upper cover through the upper protection fixing structure, and the upper protection sheet abuts against the lower end of the rolling assembly.

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