Application device of high-precision integrated screen film

Abstract

The utility model belongs to the technical field of mobile phone film pasting, and particularly relates to an application device of a high-precision integrated screen film pasting. The utility model discloses a high-precision integrated screen film application device which comprises a base, a plurality of positioning columns are arranged on the two sides of the base respectively, and the base is provided with a containing groove used for containing a display screen. One side of the base is movably connected with a scraping head seat, the scraping head seat and the base are provided with a drawing opening, and the drawing opening is used for allowing a drawing part of the drawing type protective film to penetrate through; the scraping head base can slide relative to the base in the length direction of the base, and the scraping head base is used for removing bubbles between the display screen and the protective film. The protective film can be accurately positioned by using the positioning columns, so that the protective film can be accurately attached to the display screen, and the operation is simple and convenient; the display screen main body can be kept fixed relative to the position of the protective film by using the placing groove, so that the display screen does not deviate, and the protective film is further accurately attached to the display screen; according to the integrated screen film pasting application device, the scraping head base slides relative to the base to remove bubbles between the display screen and the protective film, an operator can conveniently and completely paste the film on the display screen, the film pasting effect is improved, and the high-precision integrated screen film pasting application device is formed.

Description

Technical Field

[0001] The utility model belongs to the technical field of mobile phone films, and specifically relates to an application device for a high-precision integrated screen film. Background Technique

[0002] A mobile phone film is a film used to cover and protect the mobile phone screen, usually made of transparent plastic or glass materials. Its main functions are to prevent the screen from being scratched, damaged, stained with fingerprints and oil stains, and at the same time reduce glare. Especially for a four-curved surface mobile phone, since the four edges of the four-curved surface mobile phone screen adopt a curved surface design, it makes the selection and installation of the film for the four-curved surface mobile phone more complicated. Currently, there has also appeared a film application artifact in the market.

[0003] Such as the "automatic film application artifact" disclosed in the patent document "CN218401148U", its technical effect is that by designing a protrusion on the elastic block for positioning and clamping the protective film, when applying the film, the release film on the protective film is torn off, and then the display screen is pressed into the groove of the shell, and the screen is then attached to the tempered film, and then the display screen is separated from the shell.

[0004] In this patent, using the protrusion of the elastic block to position the protective film and pressing the display screen into the groove will cause the mobile phone film to shift from the mobile phone body, and after the mobile phone is applied with the film, the operator still needs to use a squeegee to remove the bubbles, and the process is more. Content of the Utility Model

[0005] The purpose of the utility model is to provide an application device for a high-precision integrated screen film to solve the problems put forward in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] An application device for a high-precision integrated screen film, including a base, several positioning columns are respectively arranged on both sides of the base, and the base is provided with a placement groove for placing a display screen; one side of the base is movably connected with a squeegee seat, the squeegee seat and the base are provided with a drawing port, and the drawing port is used for the drawing part of the drawable protective film to pass through; the squeegee seat can slide relative to the base along the length direction of the base, and the squeegee seat is used for removing the bubbles between the display screen and the protective film.

[0008] By adopting the above technical solution, the positioning posts can accurately position the protective film, enabling the protective film to be precisely attached to the display screen, with simple and convenient operation; the placement groove can keep the position of the display screen body fixed relative to the protective film, preventing the display screen from shifting, and further enabling the protective film to be precisely attached to the display screen; the scraper head seat slides relative to the base to remove the air bubbles between the display screen and the protective film, facilitating the operator to completely apply the film to the display screen, improving the film application effect, and forming a high-precision integrated screen film application device.

[0009] Preferably, two sliding grooves are provided at the upper end of the base, the length direction of the sliding grooves is consistent with the length direction of the base, two notches are respectively formed on one side of the two sliding grooves close to the scraper head seat, and the scraper head seat is provided with a front slider corresponding to the notches.

[0010] By adopting the above technical solution, the design of using the sliding grooves for sliding connection can ensure the precise alignment of the protective film and the display screen during the film application process, reducing the air bubbles generated due to inaccurate manual alignment. And it helps to apply uniform pressure, smoothly attaching the protective film from one end to the other end, avoiding air bubbles and wrinkles caused by local pressure application. Using the sliding grooves for film application can speed up the operation process and improve work efficiency, especially in the case of a large number of film applications, which can significantly save time.

[0011] Preferably, there is a gap between the upper surface of the sliding groove and the upper surface of the side plate of the base. The scraper head seat is provided with a sliding block, and the sliding block is provided with a sliding through groove. One side of the sliding through groove close to the scraper head seat is fixedly connected to the scraper head seat, and the two side plates of the sliding through groove are located in the gap and are slidably connected to the upper surface of the sliding groove.

[0012] By adopting the above technical solution, the guiding force-bearing area of the scraper head seat is increased, enabling the operator to apply force more conveniently and smoothly when slidingly connecting the scraper head seat with the sliding groove.

[0013] Preferably, a blocking member is provided on one side of the sliding groove away from the scraper head seat, and the blocking member is used to block the scraper head seat from sliding out of the sliding groove.

[0014] By adopting the above technical solution, setting the blocking member on the side of the sliding groove away from the scraper head seat can effectively prevent the scraper head seat from exceeding the working range of the sliding groove, avoiding derailment of the scraper head seat, and thus ensuring the normal operation and operation safety of the device.

[0015] Preferably, a bridge-shaped groove is formed inside the scraper head seat, and a bridge-shaped scraping pad is clamped inside the bridge-shaped groove.

[0016] By adopting the above technical solutions, the design of the bridge-shaped scraping pad can better fit the screen surface, provide a larger contact area, thus more effectively scraping the bubbles between the protective film and the screen. Moreover, the structures of the bridge-shaped groove and the scraping pad enable the scraping head seat to move more smoothly during the sliding process, reduce the frictional resistance, and improve the efficiency of film application.

[0017] Preferably, shaft grooves are respectively formed on both sides inside the scraping head seat, and a rotating roller is rotatably arranged inside the scraping head seat, and both ends of the rotating roller are matched with the shaft grooves.

[0018] By adopting the above technical solutions, the rotation of the rotating roller can significantly reduce the friction between the scraping head seat and the display screen, make the scraping head seat move more smoothly during the sliding process. And since the rolling friction of the rotating roller is much smaller than the sliding friction, this design can improve the sliding efficiency of the scraping head seat, making the film application or cleaning process faster and more efficient.

[0019] Preferably, the scraping head seat is provided with an inclined scraping plate assembly, and the inclined scraping plate assembly includes a limiting plate and an inclined scraping plate. The inclined scraping plate is fixedly connected to the limiting plate, and the limiting plate is fixedly connected to the scraping head seat.

[0020] By adopting the above technical solutions, the method of inclined scraping is more effective than the method of straight scraping for removing bubbles.

[0021] Preferably, the limiting plate is horizontally arranged on the scraping head seat, and the inclined scraping plate is inclinedly arranged on the limiting plate.

[0022] By adopting the above technical solutions, the inclined arrangement of the inclined scraping plate can better fit the edge or curved surface part of the screen, where bubbles usually accumulate easily. The angle design of the inclined scraping plate helps to guide the bubbles from both sides to one corner area, thus more effectively removing the bubbles.

[0023] Preferably, the number of positioning columns on one side of the base is at least 3. One of the positioning columns on one side of the base is located in the middle position, and the other positioning columns on one side of the base are symmetrically arranged.

[0024] By adopting the above technical solutions, multiple positioning columns can provide more reference points, ensuring more accurate and stable positioning without inclination during film application. This helps the protective film to be accurately aligned with the edges and corners of the mobile phone screen, reducing the deviation during film application.

[0025] The beneficial effects of the present utility model:

[0026] 1. In the application device of the high-precision integrated screen film in this application, the positioning posts can accurately position the protective film, enabling the protective film to be precisely attached to the display screen, with simple and convenient operation; the placement groove can keep the position of the display screen body fixed relative to the protective film, preventing the display screen from shifting, and further enabling the protective film to be precisely attached to the display screen; the scraper seat slides relative to the base to remove the bubbles between the display screen and the protective film, facilitating the operator to completely apply the film to the display screen, improving the film application effect, and forming a high-precision integrated screen film application device;

[0027] 2. In the application device of the high-precision integrated screen film in this application, the design of using the sliding groove for sliding connection can ensure the precise alignment of the protective film and the display screen during the film application process, reducing the bubbles generated due to inaccurate manual alignment. And it helps to apply uniform pressure, smoothly attaching the protective film from one end to the other, avoiding bubbles and wrinkles caused by local pressure application. Using the sliding groove for film application can speed up the operation process and improve work efficiency, especially in the case of a large number of film applications, which can significantly save time;

[0028] 3. In the application device of the high-precision integrated screen film in this application, by increasing the force-bearing area of the scraper seat, it is more convenient for the operator to apply force when slidingly connecting the scraper seat with the sliding groove.

[0029] Other features and advantages of the present utility model will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 : Schematic diagram of the overall structure of the present utility model.

[0031] Figure 2 : The present utility model Figure 1 Enlarged view of part A.

[0032] Figure 3 : Side view of the present utility model.

[0033] Figure 4 : Schematic diagram of the structure of the first embodiment of the scraper seat of the present utility model.

[0034] Figure 5 : Schematic diagram of the sliding of the scraper seat and the base of the present utility model.

[0035] Figure 6 : The present utility model Figure 1 Enlarged view of part B.

[0036] Figure 7 : Schematic diagram of the use of the application device of the high-precision integrated screen film of the present utility model.

[0037] Figure 8 : Structural schematic diagram of the second embodiment of the scraper head seat of the present utility model.

[0038] Figure 9 : Structural schematic diagram of the third embodiment of the scraper head seat of the present utility model.

[0039] Reference numerals: 1, positioning film layer; 11, auxiliary positioning film; 12, glass protection film; 2, AB glue layer; 3, pull-out protection film; 31, pull-out part; 32, film sticking part; 4, base; 5, positioning column; 6, placement groove; 7, scraper head seat; 8, drag slider; 9, rotation groove; 10, pull-out port; 13, chute; 14, notch; 15, front slider; 16, bridge-shaped groove; 17, sliding block; 18, sliding through groove; 19, baffle; 20, positioning hole; 21, shaft groove; 22, roller; 23, limiting plate; 24, inclined scraper. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model.

[0041] Please refer to Figure 1-7 ; The present application discloses an application device for a high-precision integrated screen film:

[0042] Embodiment 1:

[0043] For the convenience of describing the application device for the high-precision integrated screen film of the present application, the pull-out protection film targeted by the present application will be described first here. It should be noted that the present application does not limit the display screen targeted. In this embodiment, taking mobile phone film sticking as an example, the pull-out mobile phone film targeted by the present application includes a positioning film layer 1, an AB glue layer 2 and a pull-out protection film 3. The positioning film layer 1 includes an auxiliary positioning film 11 and a glass protection film 12; the pull-out protection film 3 includes a pull-out part 31 and a film sticking part 32. The glass protection film 12 of the positioning film layer 1 is bonded to one side A of the AB glue layer 2, and the film sticking part 32 of the pull-out protection film 3 is bonded to the B side of the AB glue layer 2. The auxiliary positioning film 11 of the positioning film layer 1 is located on both sides of the glass protection film 12, and positioning holes 20 are provided in the auxiliary positioning film 11 of the positioning film layer 1.

[0044] An application device for a high-precision integrated screen film, disclosed in the present application, includes a base 4. A number of positioning posts 5 are respectively arranged on both sides of the base 4. The size, quantity, and position of the positioning posts 5 correspond to the positioning holes 20 of the auxiliary positioning film 11 of the positioning film layer 1. In this embodiment, the number of positioning posts 5 on one side of the base 4 is three, and one of the positioning posts 5 is located in the middle position, and the other two positioning posts 5 are symmetrically arranged. A placement groove 6 for placing the mobile phone display screen is provided on the base 4. The size of the placement groove 6 should be such that after the mobile phone display screen is placed in the placement groove 6, the placement groove 6 can keep the relative position of the mobile phone display screen fixed, and the upper surface of the mobile phone display screen should be in contact with the pulling part 31 of the pulling protective film 3.

[0045] In this embodiment, a scraping head seat 7 is movably connected to one side of the base 4. The scraping head seat 7 is provided with a cylindrical dragging slider 8. Rotating grooves 9 are opened at corresponding positions on both sides of the base 4, so that the cylindrical dragging slider 8 can rotate with the rotating grooves 9, thereby enabling the base 4 and the scraping head seat 7 to be rotatably connected. When the scraping head seat 7 rotates relative to the base 4, a certain gap is maintained between the scraping head seat 7 and the base 4 to form a pulling opening 10, so that the pulling part 31 of the pulling protective film 3 can pass through the pulling opening 10. Two sliding grooves 13 are provided at the upper end of the base 4. The length direction of the sliding grooves 13 is the same as the length direction of the base 4. The opening direction of the sliding grooves 13 faces the inside of the placement groove 6. Two notches 14 are respectively opened on one side of the two sliding grooves 13 close to the scraping head seat 7. A front slider 15 is provided on the scraping head seat 7, and the front slider 15 can correspond to the notches 14. After the front slider 15 enters the sliding grooves 13 through the notches 14, the front slider 15 and the dragging slider 8 can slide on the sliding grooves 13. When the front slider 15 and the dragging slider 8 slide on the sliding grooves 13, the scraping head seat 7 is slidably connected to the base 4. A bridge-shaped groove 16 is opened inside the scraping head seat 7, and a bridge-shaped scraping pad (not shown in the figure) is clamped inside the bridge-shaped groove 16.

[0046] It is worth noting that if the opening direction of the sliding grooves 13 is vertically upward, when the operator slides the scraping head seat 7, a part of the force needs to be exerted to press the scraping head seat 7. Since the scraping head seat 7 is made of plastic material and can deform, if the downward pressure applied by the operator to the scraping head seat 7 is too large, the display screen is likely to be damaged; if the downward pressure applied by the operator to the scraping head seat 7 is too small, it is difficult to ensure that the scraping head seat 7 can completely remove the bubbles between the mobile phone display screen and the protective film.

[0047] Specifically, during use:

[0048] Step 1: The operator first disconnects the clamping connection between the front slider 15 and the notch 14. At this time, the scraping head seat 7 rotates relative to the base 4. The mobile phone body is placed in the placement groove 6, and the groove wall of the placement groove 6 abuts against the mobile phone body to fix the mobile phone body. Elastic clamping blocks can be arranged in the placement groove 6 to better fix the mobile phone body, with the display screen of the mobile phone facing upwards. Then, the operator sleeved the positioning hole 20 of the auxiliary positioning film 11 of the positioning film layer 1 of the mobile phone onto the positioning column 5, and noted that the pulling part 31 of the pulling protective film 3 passed through the pulling port 10 and extended outside the device. At this time, the positions of the mobile phone display screen and the mobile phone film were relatively fixed, and the mobile phone display screen abutted against the pulling protective film 3 of the mobile phone film. The operator pulled out the pulling part 31, thereby driving the protective film to be pulled out as well, so that the mobile phone display screen contacted the AB glue layer 2 of the mobile phone film and completed the first step of mobile phone film pasting. Because of the sleeving of the positioning column 5 and the positioning hole 20, the mobile phone display screen can be precisely pasted with the AB glue layer 2 of the mobile phone film;

[0049] Step 2: The operator inserts the front slider 15 into the sliding groove 13 through the notch 14. Since both the front slider 15 and the dragging slider 8 can slide relative to the sliding groove 13, the scraping head seat 7 and the base 4 can slide relative to each other. The operator fixes the base 4 and slides the scraping head seat 7. It should be noted that the base 4 includes a fixing frame to facilitate the operator to fix the base 4. After that, the scraping head seat 7 slides relative to the base 4, and the bridge-shaped scraping pad inside the scraping head seat 7 slides relative to the mobile phone display screen, capable of removing the bubbles between the pasting part of the mobile phone film and the mobile phone display screen. The bridge-shaped scraping pad includes two guiding parts and a semi-convex part. The two ends of the semi-convex part are respectively fixedly connected to the two guiding parts. The guiding parts are perpendicular to the sliding direction of the scraping head seat 7, so that the semi-convex part can separate the bubbles and gather them on both guiding parts. Then the scraping head seat 7 continues to slide to the lower edge, and the two guiding parts can squeeze the gathered bubbles out from the corners.

[0050] It should be noted that when the device has been used for a long time and the bridge-shaped scraping pad is deformed and it is difficult to remove the bubbles well, the operator can take out the bridge-shaped scraping pad from the bridge-shaped groove and add a new bridge-shaped scraping pad to be used, which can increase the service life of the device.

[0051] In order to make it more convenient for the operator to pull the scraper head seat 7 to slide, the scraper head seat 7 is further provided with a sliding block 17. The sliding block 17 is provided with a sliding through groove 18. The opening direction of the sliding through groove 18 faces the mobile phone display screen, and the opening direction of the other part of the sliding through groove 18 faces the side away from the scraper head seat 7. There is a gap between the upper surface of the sliding groove 13 and the upper surface of the side plate of the base 4. The outer side wall of the sliding through groove 18 close to the scraper head seat 7 is fixedly connected to the scraper head seat 7. The two side plates of the sliding through groove 18 are located in the gap, and the two side plates of the sliding through groove 18 are slidably connected to the upper surface of the sliding groove 13; so that when the operator slidably connects the scraper head seat 7 with the sliding groove 13, it is more convenient to apply force. A blocking member is provided on the side of the sliding groove 13 away from the scraper head seat 7. In this embodiment, the blocking member is not limited. The blocking member is used to block the scraper head seat 7 from sliding out of the sliding groove 13. In this embodiment, the baffle 19 is taken as an example, and the baffle 19 is installed on the outer side surface of the sliding groove 13.

[0052] During use, the operator can pull the scraper head seat 7 through the force on the sliding block 17 to clear the bubbles between the mobile phone film and the mobile phone display screen. At the same time, the operator can pull the sliding block 17 until the scraper head seat 7 touches the baffle 19. At this time, the sliding block 17 stops sliding under the force, so that the operator can clearly understand that the scraper head seat 7 has completed the removal of the bubbles.

[0053] It should be noted that in other embodiments, the blocking member is an end plug, and the end plug is located in the sliding groove 13 and at the end of the sliding groove 13 away from the scraper head seat 7.

[0054] Embodiment Two:

[0055] Most of the structures of this embodiment are the same as those of Embodiment One.

[0056] The different structure of this embodiment from Embodiment One is:

[0057] In this embodiment, two shaft grooves 21 are respectively opened on both sides of the scraper head seat 7, and a roller 22 is rotatably arranged inside the scraper head seat 7. The two ends of the roller 22 are matched with the shaft grooves 21.

[0058] During use, the scraper head seat 7 and the base 4 slide relative to each other, and the roller 22 rotates driven by the scraper head seat 7. The roller 22 rotates to push the bubbles to move. Because the rolling friction of the roller 22 is much smaller than the sliding friction, the sliding efficiency of the scraper head seat 7 can be improved, making the process of removing bubbles faster and more efficient; and the design of the roller 22 helps to apply pressure evenly during the sliding process, ensuring that the AB glue layer 2 can be evenly attached to the surface of the mobile phone display screen; the rotation of the roller 22 can adapt to surfaces with different shapes and curvatures, enabling the scraper head seat 7 to be flexibly applied to the film pasting tasks of various different display screens.

[0059] Embodiment Three:

[0060] Most of the structures of this embodiment are the same as those of the first embodiment.

[0061] The different structure of this embodiment from the first embodiment is as follows:

[0062] In this embodiment, the scraper head seat 7 is provided with an inclined scraper assembly. The inclined scraper assembly includes a limiting plate 23 and an inclined scraper 24. The limiting plate 23 is horizontally arranged on the scraper head seat 7 and is fixedly connected to the scraper head seat 7; the inclined scraper 24 is inclinedly arranged on the limiting plate 23 and is fixedly connected to the limiting plate 23.

[0063] During use, the operator slides the scraper head seat 7 along the sliding groove 13. The scraper head seat 7 is slidably connected through the sliding groove 13. During the sliding process, in the inclined scraper assembly, the inclined scraper 24 is inclinedly arranged on the limiting plate 23, and the inclined scraper 24 can first scrape out air bubbles from one end when contacting the positioning film layer 1. Specifically, the front end of the inclined scraper 24 first contacts the positioning film layer 1, and effectively guides the air bubbles from the contact point step by step to the other end of the inclined scraper. When the inclined scraper 24 starts to scrape out air bubbles from the end that first contacts the positioning film layer 1, the air bubbles will be gradually guided to the end of the inclined scraper 24 along the length direction of the inclined scraper 24. During this process, the air bubbles will be gradually concentrated and pushed until they reach the end of the inclined scraper 24 where it finally contacts the positioning film layer 1. At this end, the air bubbles are completely removed, so that a bubble-free and tight adhesion is formed between the film and the positioning film layer 1.

[0064] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0065] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-precision integrated screen film application device, comprising a base (4), characterized in that: A plurality of positioning columns (5) are respectively arranged on both sides of the base (4), and the base (4) is provided with a placement groove (6) for placing a display screen; a scraper seat (7) is movably connected to one side of the base (4), and a pull-out opening (10) is provided between the scraper seat (7) and the base (4), and the pull-out opening (10) is used for the pull-out portion (31) of the pull-out protective film (32) to pass through; the scraper seat (7) can slide relative to the base (4) and slide along the length direction of the base (4), and the scraper seat (7) is used to remove bubbles between the display screen and the protective film.

2. The application device of a high-precision integrated screen film according to claim 1, characterized in that: Two slide grooves (13) are arranged at the upper end of the base (4), and the length direction of the slide grooves (13) is consistent with the length direction of the base (4). Two notches (14) are respectively provided on one side of the two slide grooves (13) close to the scraper head seat (7). The scraper head seat (7) is provided with a front sliding block (15), and the front sliding block (15) corresponds to the notch (14).

3. The application device of a high-precision integrated screen film according to claim 2, characterized in that: A gap is provided between the upper surface of the slide groove (13) and the upper surface of the side plate of the base (4); the scraper head seat (7) is provided with a sliding block (17); the sliding block (17) is provided with a sliding groove (18); the sliding groove (18) is fixedly connected to the scraper head seat (7) on one side close to the scraper head seat (7); the two side plates of the sliding groove (18) are located in the gap, and the two side plates of the sliding groove (18) are slidably connected to the upper surface of the slide groove (13).

4. The high-precision integrated screen film application device according to claim 3, characterized in that: A blocking member is provided on the side of the slide groove (13) away from the scraper head seat (7), and the blocking member is used to prevent the scraper head seat (7) from sliding out of the slide groove (13).

5. The application device of a high-precision integrated screen film according to any one of claims 1 to 4, characterized in that: A bridge-shaped groove (16) is provided on the inner side of the scraper head seat (7), and a bridge-shaped scraper pad is clamped inside the bridge-shaped groove (16).

6. The high-precision integrated screen film application device according to claim 1, characterized in that: Axle grooves (21) are respectively provided on both sides of the scraper head seat (7), and a rotating roller (22) is rotatably arranged inside the scraper head seat (7), and both ends of the rotating roller (22) are matched with the axle grooves (21).

7. The high-precision integrated screen film application device according to claim 1, characterized in that: The scraper head seat (7) is provided with an inclined scraper plate assembly, and the inclined scraper plate assembly comprises a limit plate (23) and an inclined scraper plate (24). The inclined scraper plate (24) is fixedly connected to the limit plate (23), and the limit plate (23) is fixedly connected to the scraper head seat (7).

8. The high-precision integrated screen film application device according to claim 7, characterized in that: The limiting plate (23) is horizontally arranged on the scraper head seat (7), and the inclined scraper plate (24) is inclinedly arranged on the limiting plate (23).

9. The high-precision integrated screen film application device according to claim 1, characterized in that: The number of the positioning columns (5) on one side is at least three, one of the positioning columns (5) on one side of the base (4) is located in the middle position, and the other positioning columns (5) on one side of the base (4) are symmetrically arranged.

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