EVA (Ethylene Vinyl Acetate) adhesive film laminating equipment for TOPCon photovoltaic module

Abstract

The invention discloses EVA (Ethylene Vinyl Acetate) adhesive film laminating equipment for a TOPCon photovoltaic module. The EVA adhesive film laminating equipment comprises a machine table, a laminating mechanism and a bubble removing mechanism, and a laminating table is mounted on the machine table. The laminating mechanism comprises a support, a first air cylinder, a sealing cover and an upper pressing plate mechanism, the support is installed on the machine table and stretches across the laminating table, the first air cylinder is installed on the support, the sealing cover is installed at the free end of the first air cylinder and can cover the laminating table, and the upper pressing plate mechanism is movably arranged in the sealing cover and corresponds to the laminating table. The bubble removing mechanism is installed on the upper pressing plate mechanism, and when the EVA adhesive film is attached to the photovoltaic module, the bubble removing mechanism is used for fixing the photovoltaic module and removing bubbles in the photovoltaic module. The bubble removing mechanism is additionally arranged, bubbles generated in the film pasting process of the photovoltaic module can be effectively removed, the influence of the bubbles on production of the photovoltaic module is avoided, the film pasting quality of the photovoltaic module is guaranteed, and meanwhile the follow-up production yield of the photovoltaic module can also be guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of photovoltaic module manufacturing technology, specifically relating to an EVA film lamination device for TOPCon photovoltaic modules. Background Technology

[0002] Photovoltaic encapsulant film, as a key material for encapsulating photovoltaic modules (such as TOPCon photovoltaic modules), plays a crucial role in the module-level encapsulation of solar panels. It not only supports the cell wiring but also provides maximum light coupling between the cells and solar radiation. Simultaneously, the photovoltaic encapsulant film effectively isolates the cells and wiring and conducts heat generated by the cells, ensuring the stable operation of the solar power generation system.

[0003] Photovoltaic encapsulant films on the market are mainly divided into three categories: EVA film, POE film, and co-extruded EPE film. Among them, EVA film is widely used due to its high adhesion, good durability, and excellent optical properties. Chinese patent CN221226249U discloses a laminator for photovoltaic module processing. Through a lifting and adjusting mechanism, it allows the handwheel to rotate the lead screw inside the support frame according to different ground heights. When the lead screw rotates, the moving head and connecting rod move on the outer surface of the lead screw. The movement of the moving head causes the connecting rod and base to move, and the movement of the connecting rod causes the limiting block to slide and limit within the limiting groove, thus adjusting the laminator body to the desired position. This facilitates stable placement of the laminator body via the support frame, improving the stability of the laminator body during photovoltaic module processing and meeting usage requirements to a certain extent.

[0004] However, when using this device to apply EVA film to TOPCon photovoltaic modules, air bubbles are prone to appear inside the photovoltaic modules due to insufficient vacuuming or uneven heating plate temperature. The aforementioned equipment lacks a corresponding de-bubbling device, which will significantly reduce the film application quality of the photovoltaic modules and greatly reduce the production yield of the photovoltaic modules.

[0005] Therefore, in order to address the above-mentioned technical problems, it is necessary to provide an EVA film bonding device for TOPCon photovoltaic modules.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide an EVA film bonding device for TOPCon photovoltaic modules, which can solve the problem of air bubbles easily generated when bonding EVA film to photovoltaic modules.

[0008] To achieve the above objectives, a specific embodiment of the present invention provides the following technical solution:

[0009] A TOPCon photovoltaic module EVA film lamination device includes a machine base, a lamination mechanism, and a bubble removal mechanism. A lamination table is mounted on the machine base. The lamination mechanism includes a bracket, a first cylinder, a sealing cover, and an upper pressure plate mechanism. The bracket is mounted on the machine base and spans the lamination table. The first cylinder is mounted on the bracket. The sealing cover is mounted on the free end of the first cylinder and covers the lamination table. The upper pressure plate mechanism is movably disposed within the sealing cover and corresponds to the lamination table. The bubble removal mechanism is mounted on the upper pressure plate mechanism. During the lamination of the photovoltaic module with EVA film, the bubble removal mechanism is used to fix the photovoltaic module and remove air bubbles within the photovoltaic module.

[0010] In one or more embodiments of the present invention, the upper pressure plate mechanism includes a pair of second cylinders, a mounting base, and a pressing plate. The second cylinders are mounted on the sealing cover. The mounting base is connected to the free ends of the pair of second cylinders. The pressing plate is mounted on the lower end face of the mounting base and corresponds to the bonding platform.

[0011] In one or more embodiments of the present invention, the horizontal cross-sectional area of ​​the mounting base is larger than the horizontal cross-sectional area of ​​the pressing plate.

[0012] In one or more embodiments of the present invention, the de-bubble mechanism includes a pair of guide rails, a pair of motors, a pair of telescopic members, and a de-bubble plate. The pair of guide rails are symmetrically mounted on the sidewall of the mounting base. The pair of motors are respectively mounted on the pair of guide rails, and the output end of each motor is connected to a lead screw, which is rotatably connected within the guide rail. A first moving block is provided within the guide rail, and the first moving block is threadedly connected to the lead screw. The pair of telescopic members are respectively connected to the pair of first moving blocks. The de-bubble plate is connected to the free end of the telescopic member. When the mounting base is away from the bonding platform, the de-bubble plate is located below the mounting base.

[0013] In one or more embodiments of the present invention, the length of the guide rail is greater than the length of the mounting base, and the maximum extension length of the telescopic member is greater than the height between the mounting base and the pressing plate.

[0014] In one or more embodiments of the present invention, a spring is provided on the outer side of the telescopic member, the spring is located between the first moving block and the de-bubble plate, and a connecting cone plate is connected to the bottom of the de-bubble plate, the connecting cone plate being made of a heat-conducting metal material.

[0015] In one or more embodiments of the present invention, anti-collision pads are provided on the sides of the pair of bubble-removing plates that are close to each other.

[0016] In one or more embodiments of the present invention, an air pump is installed inside the debubbling plate, the suction end of the air pump passes through the debubbling plate, the air outlet end of the air pump is connected to a straight pipe, the straight pipe is installed on the debubbling plate, and the straight pipe is provided with a plurality of air outlet holes, the air outlet holes corresponding to the connecting cone plate.

[0017] In one or more embodiments of the present invention, a positioning plate is slidably provided on the debubbling plate, a pair of second moving blocks are fixedly connected to the positioning plate, the debubbling plate is provided with a sliding groove that matches the second moving blocks, and an ear plate is connected to the side wall of the mounting base, the ear plate corresponding to the positioning plate.

[0018] In one or more embodiments of the present invention, a guide rod is fixedly connected in the sliding groove, the second moving block is slidable on the guide rod, and an elastic sleeve is provided on the outside of the guide rod, the elastic sleeve corresponding to the second moving block.

[0019] Compared with the prior art, the TOPCon photovoltaic module EVA film lamination equipment of the present invention is equipped with a bubble removal mechanism, which can effectively remove bubbles generated during the photovoltaic module lamination process, avoid the impact of bubbles on photovoltaic module production, ensure the lamination quality of photovoltaic modules, and also ensure the yield rate of subsequent photovoltaic module production. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a perspective view of an EVA film bonding device for TOPCon photovoltaic modules according to an embodiment of the present invention;

[0022] Figure 2 This is a partial structural schematic diagram of an EVA film bonding device for TOPCon photovoltaic modules according to one embodiment of the present invention;

[0023] Figure 3 for Figure 2 Schematic diagram of the structure at point A in the middle;

[0024] Figure 4 This is a schematic diagram of the bonding mechanism in one embodiment of the present invention;

[0025] Figure 5 for Figure 4 Schematic diagram of the structure at point B;

[0026] Figure 6 for Figure 4 Schematic diagram of the structure at point C;

[0027] Figure 7 This is a schematic diagram of the bonding mechanism in the bonding state in one embodiment of the present invention;

[0028] Figure 8 for Figure 7 Schematic diagram of the structure at point D.

[0029] Explanation of key figure labels:

[0030] 1-Machine base, 101-Laminating table, 2-Laminating mechanism, 201-Bracket, 202-First cylinder, 203-Sealing cover, 204-Second cylinder, 205-Mounting base, 2051-Ear plate, 206-Pressure plate, 3-De-bubble mechanism, 301-Guide rail, 302-Motor, 303-First moving block, 304-Telescopic component, 305-De-bubble plate, 3051-Anti-collision pad, 3052-Air pump, 3053-Straight pipe, 3054-Positioning plate, 3055-Second moving block, 3056-Guide rod, 306-Spring, 307-Connecting cone plate. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0032] like Figures 1 to 8 As shown, an embodiment of the present invention provides an EVA film bonding device for TOPCon photovoltaic modules, comprising a machine base 1, a bonding mechanism 2, and a de-bubbling mechanism 3. A bonding table 101 is mounted on the machine base 1. The bonding mechanism 2 includes a bracket 201, a first cylinder 202, a sealing cover 203, and an upper pressure plate mechanism. The bracket 201 is mounted on the machine base 1 and spans across the bonding table 101. The first cylinder 202 is mounted on the bracket 201. The sealing cover 203 is mounted on the free end of the first cylinder 202 and can cover the bonding table 101. The upper pressure plate mechanism is movably disposed within the sealing cover 203 and corresponds to the bonding table 101. The de-bubbling mechanism 3 is mounted on the upper pressure plate mechanism. During the bonding of EVA film to the photovoltaic modules, the de-bubbling mechanism 3 is used to fix the photovoltaic modules and remove air bubbles from within the photovoltaic modules.

[0033] The bonding platform 101 is used to place photovoltaic modules, such as TOPCon photovoltaic modules. The bracket 201 is used to mount the first cylinder 202 to control the lifting and lowering of the sealing cover 203 and the upper pressure plate mechanism. During the film application operation on the photovoltaic modules, the sealing cover 203 covers the bonding platform 101 and the photovoltaic modules. The heat generated during the application by the upper pressure plate mechanism allows the interior of the sealing cover 203 to heat up rapidly, reducing the time required to continuously heat the photovoltaic modules and thus achieving energy savings to some extent. Through the cooperation of the upper pressure plate mechanism and the bonding platform 101, the EVA film can be bonded to the photovoltaic modules.

[0034] The TOPCon photovoltaic module to be bonded with EVA film is placed on the bonding table 101, and the EVA film is placed on the TOPCon photovoltaic module. The first cylinder 202 is extended, causing the sealing cover 203 and the upper pressure plate mechanism to descend, covering the TOPCon photovoltaic module. Then, the upper pressure plate mechanism is operated to bond the EVA film onto the TOPCon photovoltaic module. During the bonding operation of the upper pressure plate mechanism, the de-bubbling mechanism 3 secures the TOPCon photovoltaic module, preventing it from shifting on the bonding table 101. After the EVA film is bonded, the upper pressure plate mechanism is moved away from the TOPCon photovoltaic module, and the de-bubbling mechanism 3 removes air bubbles from the bonded TOPCon photovoltaic module to prevent air bubbles from affecting the bonding quality.

[0035] In this embodiment, the sealing cover 203 is made of heat-insulating material, which can prevent heat from the inside of the sealing cover 203 from being lost through the sealing cover 203.

[0036] like Figures 1 to 8 As shown, the upper pressure plate mechanism includes a pair of second cylinders 204, a mounting base 205, and a pressing plate 206. The second cylinders 204 are mounted on the sealing cover 203. The mounting base 205 is connected to the free ends of the pair of second cylinders 204. The pressing plate 206 is mounted on the lower end face of the mounting base 205 and corresponds to the bonding platform 101. The second cylinders 204 are used to control the lifting and lowering of the mounting base 205 and the pressing plate 206 within the sealing cover 203. The mounting base 205 is used to mount the pressing plate 206. The pressing plate 206 is used to bond the EVA film to the TOPCon photovoltaic module.

[0037] When the sealing cover 203 covers the TOPCon photovoltaic module, the second cylinder 204 is extended. The second cylinder 204 moves the mounting base 205 and the pressing plate 206 closer to the TOPCon photovoltaic module on the bonding table 101 until the pressing plate 206 adheres to and presses the EVA film on the surface of the TOPCon photovoltaic module. The pressing plate 206 then begins to heat up, melting the EVA film and bringing it into full contact with the TOPCon photovoltaic module.

[0038] Preferably, the pressing plate 206 is an electromagnetic heating plate.

[0039] In this embodiment, the horizontal cross-sectional area of ​​the mounting base 205 is larger than that of the pressure plate 206, and it is used to install the bubble removal mechanism 3.

[0040] like Figures 1 to 8 As shown, the debubbling mechanism 3 includes a pair of guide rails 301, a pair of motors 302, a pair of telescopic members 304, and a debubbling plate 305. The pair of guide rails 301 are symmetrically mounted on the side wall of the mounting base 205. The pair of motors 302 are respectively mounted on the pair of guide rails 301. A lead screw is connected to the output end of each motor 302, and the lead screw is rotatably connected inside the guide rail 301. A first moving block 303 is provided inside the guide rail 301, and the first moving block 303 is threaded onto the lead screw. The pair of telescopic members 304 are respectively connected to the pair of first moving blocks 303. The debubbling plate 305 is connected to the free end of the telescopic member 304. When the mounting base 205 is away from the bonding table 101, the debubbling plate 305 is located below the mounting base 205. The guide rails 301 are used to control the movement of the debubbling plate 305, and the motors 302 provide power for the movement of the debubbling plate 305. When motor 302 is running, it rotates the lead screw. Since the lead screw is threadedly connected to the first moving block 303, the first moving block 303 is able to move within the guide rail 301 due to the threaded action. Telescopic member 304 is used to connect the debubbling plate 305 to the first moving block 303, allowing the debubbling plate 305 to move with the first moving block 303. The debubbling plate 305 is used to remove air bubbles.

[0041] When the EVA film is bonded to the pressing plate 206, the de-bubble plate 305 moves to both sides of the pressing plate 206 under the control of the motor 302, the lead screw, and the first moving block 303. Figures 7 to 8The position shown ensures that the normal bonding of the EVA film is not affected. When air bubbles need to be removed, first control the second cylinder 204 to retract, moving the pressing plate 206 away from the TOPCon photovoltaic module. Then, a pair of motors 302 can be operated synchronously, causing both de-bubble plates 305 to move to the upper side of the TOPCon photovoltaic module, and then control the second cylinder 204 to extend. The de-bubble plates 305 first contact the upper surface of the TOPCon photovoltaic module, and the second cylinder 204 continues to extend, causing the pressing plate 206 to apply force to the de-bubble plates 305. At this time, the de-bubble plates 305 also apply force to the surface of the TOPCon photovoltaic module. A pair of motors 302 can be operated synchronously or one of the motors 302 can be operated alone. The operating motor 302 enables the de-bubble plates 305 to move on the surface of the TOPCon photovoltaic module, using the moving de-bubble plates 305 to remove any air bubbles that may exist on the surface of the TOPCon photovoltaic module. The stationary debubbling plate 305 can press the TOPCon photovoltaic module firmly, preventing the TOPCon photovoltaic module from shifting due to the movement of the debubbling plate 305.

[0042] In this embodiment, motor 302 is a reciprocating motor that can control the reciprocating movement of the debubbling plate 305. A pair of motors 302 can operate simultaneously or individually, and a pair of debubbling plates 305 can move towards each other or in opposite directions to meet the usage requirements of different working conditions.

[0043] Preferably, the length of the guide rail 301 is greater than the length of the mounting base 205, and the maximum extension length of the telescopic component 304 is greater than the height between the mounting base 205 and the pressing plate 206, so that the de-bubbling plate 305 can completely remove bubbles from the surface of the TOPCon photovoltaic module.

[0044] The telescopic component 304 has a spring 306 on its outer side, positioned between the first moving block 303 and the debubbling plate 305. A connecting cone 307, made of thermally conductive metal, is connected to the bottom of the debubbling plate 305. The spring 306 enhances the debubbling effect of the debubbling plate 305 on the TOPCon photovoltaic module, preventing damage to the module's surface.

[0045] In addition, anti-collision pads 3051 are provided on the sides of the pair of bubble-removing boards 305 that are close to each other. When the pair of bubble-removing boards 305 move towards each other, the anti-collision effect can be increased.

[0046] Preferably, the length of the connecting cone plate 307 is greater than the length of the mating table 101 to ensure the subsequent use effect of the connecting cone plate 307.

[0047] like Figures 1 to 8As shown, an air pump 3052 is installed inside the debubbling plate 305. The suction end of the air pump 3052 passes through the debubbling plate 305, and the air outlet end of the air pump 3052 is connected to a straight pipe 3053. The straight pipe 3053 is installed on the debubbling plate 305, and multiple air outlets are provided on the straight pipe 3053. The air outlets correspond to the connecting cone plate 307.

[0048] During the debubbling process of the TOPCon photovoltaic module, the sealing cover 203 always covers the TOPCon photovoltaic module, meaning that the inside of the sealing cover 203 is always at a high temperature. At this time, the vacuum pump 3052 is operated, which can extract the hot air inside the sealing cover 203 and spray the extracted hot air towards the connecting cone plate 307 through the straight pipe 3053. This allows the heat inside the sealing cover 203 to accumulate at the contact part between the connecting cone plate 307 and the TOPCon photovoltaic module, so that the connecting cone plate 307 can better remove bubbles from the surface of the TOPCon photovoltaic module.

[0049] like Figures 1 to 8 As shown, a positioning plate 3054 is slidably mounted on the debubbling plate 305. A pair of second moving blocks 3055 are fixedly connected to the positioning plate 3054. The debubbling plate 305 has a sliding groove that matches the second moving blocks 3055. An ear plate 2051 is connected to the side wall of the mounting base 205, and the ear plate 2051 corresponds to the positioning plate 3054. A guide rod 3056 is fixedly connected in the sliding groove. The second moving blocks 3055 can slide on the guide rod 3056. An elastic sleeve is provided on the outside of the guide rod 3056, and the elastic sleeve corresponds to the second moving blocks 3055.

[0050] When the sealing cover 203 covers the TOPCon photovoltaic module, the second cylinder 204 is extended, bringing the mounting base 205 and the pressing plate 206 closer to the TOPCon photovoltaic module. Since the de-bubbling plate 305 is connected to the guide rail 301, it can contact the table surface of the machine before the pressing plate 206 contacts the TOPCon photovoltaic module. As the pressing plate 206 continues to descend, the telescopic component 304 retracts, and the ear plate 2051 approaches and contacts the positioning plate 3054, allowing the positioning plate 3054 to slide along the inclined surface of the de-bubbling plate 305. When the mounting base 205 presses against and squeezes the TOPCon photovoltaic module, the upper surface of the positioning plate 3054 is flush with the upper surface of the de-bubbling plate 305, and the sidewall of the positioning plate 3054 contacts the TOPCon photovoltaic module. Figures 7 to 8 As shown. Thus, when the pressing plate 206 is used to bond the EVA film, the positioning plate 3054 can prevent the molten EVA film from leaking, ensuring the bonding effect at the corners of the TOPCon photovoltaic module.

[0051] When the pressing plate 206 moves away from the TOPCon photovoltaic module, the ear plate 2051 will not exert force on the positioning plate 3054. The positioning plate 3054 will recover under the action of the elastic sleeve and the second moving block 3055, which facilitates the separation of the mounting base 205 from the TOPCon photovoltaic module.

[0052] In summary, the sealing cover 203 in this application allows the TOPCon photovoltaic module and EVA film to heat up rapidly, reducing the time required for continuous heating of the photovoltaic module and thus achieving energy savings to some extent. The bubble-removing mechanism 3 not only secures the TOPCon photovoltaic module and ensures the film application effect, but also removes air bubbles from the surface of the TOPCon photovoltaic module, preventing them from affecting the film application. The positioning plate 3054 ensures the quality of the film application at the corners of the TOPCon photovoltaic module.

[0053] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0054] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider 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. An EVA adhesive film lamination device for a TOPCon photovoltaic module, characterized by, The utility model relates to a photovoltaic module EVA film laminating device, which comprises a machine table, a laminating table mounted on the machine table, a laminating mechanism, and a bubble-removing mechanism. The laminating mechanism comprises a support, a first air cylinder, a sealing cover, and an upper pressing plate mechanism. The support is mounted on the machine table and spans the laminating table. The first air cylinder is mounted on the support.

2. The EVA film laminating device for TOPCon photovoltaic module according to claim 1, characterized in that, The sealing cover is mounted on the free end of the first air cylinder and can cover the laminating table. The upper pressing plate mechanism is movably arranged in the sealing cover and corresponds to the laminating table. The bubble-removing mechanism is mounted on the upper pressing plate mechanism and is used to fix the photovoltaic module and remove bubbles in the photovoltaic module when the photovoltaic module is laminated with EVA film. The upper pressing plate mechanism comprises a pair of second air cylinders mounted on the sealing cover, a mounting seat connected to the free ends of the second air cylinders, and a pressing plate mounted on the lower end face of the mounting seat and corresponding to the laminating table.

3. The EVA film laminating device for TOPCon photovoltaic module according to claim 2, characterized in that, The horizontal cross-sectional area of the mounting seat is larger than that of the pressing plate.

4. The EVA film laminating device for TOPCon photovoltaic module according to claim 2, characterized in that, The bubble-removing mechanism comprises a pair of guide rails symmetrically mounted on the side walls of the mounting seat, a pair of motors mounted on the guide rails, respectively, a screw rod connected to the output end of each motor and rotatably connected to the guide rail, a first moving block arranged in the guide rail and threadedly connected to the screw rod, a pair of telescopic members connected to the first moving blocks, respectively, a bubble-removing plate connected to the free end of each telescopic member, and a connecting cone plate connected to the lower bottom of the bubble-removing plate. When the mounting seat is away from the laminating table, the bubble-removing plate is on the lower side of the mounting seat. The length of the guide rail is greater than that of the mounting seat. The maximum extension length of the telescopic member is greater than the height between the mounting seat and the pressing plate. A spring is arranged outside the telescopic member between the first moving block and the bubble-removing plate. The connecting cone plate is made of heat-conducting metal.

5. The EVA film laminating device for TOPCon photovoltaic module according to claim 4, characterized in that, The side of each bubble-removing plate that faces the other bubble-removing plate is provided with a bumper pad.

6. The EVA film laminating device for TOPCon photovoltaic module according to claim 4, characterized in that, An air pump is mounted in the bubble-removing plate.

7. The EVA film laminating device for TOPCon photovoltaic module according to claim 4, characterized in that, The air suction end of the air pump penetrates through the bubble-removing plate.

8. The EVA film laminating device for TOPCon photovoltaic module according to claim 6, characterized in that, A straight pipe is connected to the air outlet end of the air pump.

9. The EVA glue film laminating device for TOPCon photovoltaic module according to claim 4, characterized in that, The straight pipe is mounted on the bubble-removing plate.

10. The EVA film laminating device for TOPCon photovoltaic module according to claim 9, characterized in that, A plurality of air outlet holes are arranged on the straight pipe and correspond to the connecting cone plate. A positioning plate is slidably arranged on the bubble-removing plate. A pair of second moving blocks are fixedly connected to the positioning plate. The bubble-removing plate is provided with a sliding groove matched with the second moving blocks. An ear plate is connected to the side wall of the mounting seat and corresponds to the positioning plate. A guide rod is fixedly connected in the sliding groove. The second moving blocks can slide on the guide rod. An elastic sleeve is arranged outside the guide rod and corresponds to the second moving blocks.

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