Self-cleaning type pressing net structure for photovoltaic module string welding machine

Abstract

The application discloses a self-cleaning type screen pressing structure for a photovoltaic module string welding machine, which comprises a screen pressing transmission seat, a conduction roller, a driving roller, a return line, a plurality of screen pressing pieces and a blowing seat, the screen pressing pieces are uniformly distributed on the surface of the return line and move circularly along with the return line, a guide strip is fixedly installed on the bottom surface of the screen pressing piece, a piezoelectric vibrator is embeddedly installed on the inner side of the guide strip, an electrode sliding strip is arranged on the bottom surface of the screen pressing piece, an electrode guide wheel is fixedly sleeved on the surface of the conduction roller, and an elastic contact is arranged on the surface of the electrode guide wheel and is in abutting contact with the electrode sliding strip. The screen pressing piece is bent and deformed when moving circularly along with the return line, so that the solidified adhesion is preliminarily stripped, the piezoelectric vibrator generates high-frequency vibration to further loosen the pollutants, the high-pressure airflow blown by the blowing seat is used for completing blowing and cleaning, the on-line automatic cleaning of the screen pressing piece is realized, the screen pressing cleaning effect and the continuous operation capacity of the string welding equipment are improved, the frequency of manual maintenance is reduced, and the string welding quality and the service life of the screen pressing are improved.

Description

Technical Field

[0001] This invention relates to the field of string welding machine technology, specifically to a self-cleaning grid pressing structure for a photovoltaic module string welding machine. Background Technology

[0002] As the photovoltaic module manufacturing industry continues to develop towards higher efficiency and automation, string welding machines, as the core equipment for interconnecting solar cells, are widely used in the photovoltaic module production process. During operation, string welding machines typically use a mesh clamp to hold and guide the solder strips, ensuring a stable fit between the strips and the cells to guarantee welding quality and production efficiency. Because string welding equipment operates continuously for extended periods, flux volatiles, solder residue, and dust can easily adhere to the mesh clamp surface. Therefore, regular cleaning of the mesh clamp is necessary to maintain its permeability, holding effect, and welding stability.

[0003] In existing technologies, a mounting base is typically installed below the recirculation line of the wire mesh in a stringer. A roller brush and multiple nozzles are mounted on the mounting base. Cleaning fluid is sprayed onto the roller brush through the nozzles, and the roller brush then performs contact cleaning on the recirculating wire mesh. A recirculation fluid collection tank is used to recover the cleaning fluid. This structure can reduce flux crystallization on the wire mesh surface to some extent and achieve cyclic cleaning of the wire mesh. However, its cleaning method mainly relies on roller brush friction and liquid rinsing. The cleaning effect is still limited for contaminants such as flux residue and solder particles that form and adhere firmly to the wire mesh surface under high temperatures. Long-term contact between the roller brush and the wire mesh can also cause wear, increasing maintenance costs and potentially affecting the lifespan of the wire mesh itself. Furthermore, existing wire mesh cleaning methods mostly focus on the wire mesh recirculation path, lacking sufficient real-time cleaning capability for the working surface. Contaminants may continue to accumulate on the wire mesh during welding, leading to a decrease in holding effect and even affecting the bonding quality between the solder strip and the solar cell.

[0004] In view of this, this paper studies and improves upon existing problems, and provides a self-cleaning mesh pressing structure for photovoltaic module string welding machines. This structure solves the problems of poor removal of solidified deposits on the mesh pressing surface, easy wear of the mesh pressing, insufficient online self-cleaning ability, and difficulty in achieving vibration cleaning under cyclic motion. The aim of this technology is to solve the problems and improve its practical value. Summary of the Invention

[0005] The present invention aims to solve the problems of flux crystallization, solder particles and dust and other contaminants that easily adhere to the surface of the grid during long-term operation of the existing photovoltaic module string bonding machine grid structure. Traditional roller brush or liquid washing methods are difficult to completely remove the solidified deposits, which easily cause grid wear and have insufficient online automatic cleaning capabilities.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A self-cleaning mesh pressing structure for a photovoltaic module string welding machine includes a mesh pressing drive seat, a conduction roller, a drive roller, and a return line. The conduction roller and the drive roller are arranged on the surface of the mesh pressing drive seat and are used to drive the return line to rotate cyclically on the surface of the mesh pressing drive seat.

[0007] The return line surface is uniformly distributed with several pressure mesh sheets. A purge seat is fixedly installed on the surface of the pressure mesh transmission base. A guide bar is fixedly installed on the bottom surface of the pressure mesh sheets. A piezoelectric vibrator is embedded in the inner side of the guide bar. An electrode slide bar for supplying power to the piezoelectric vibrator is provided on the bottom surface of the pressure mesh sheets. An electrode guide wheel is fixedly sleeved on the surface of the transmission roller. An elastic contact for contacting and communicating with the electrode slide bar is provided on the surface of the electrode guide wheel. An air distribution plate is provided on the bottom surface of the purge seat. Specifically, when the pressure mesh sheets circulate with the return line to the position of the transmission roller, they undergo bending deformation. The solidified deposits on the surface of the pressure mesh sheets peel off due to the different deformation. Subsequently, the electrode slide bar and the elastic contact automatically conduct, and the piezoelectric vibrator generates high-frequency vibration, which is transmitted to the entire pressure mesh sheet through the guide bar, further loosening and removing residual contaminants. Afterward, the pressure mesh sheets continue to move to the bottom of the purge seat, where high-pressure gas is ejected through the air distribution plate, blowing the removed contaminants away from the surface of the pressure mesh sheets, realizing continuous online self-cleaning of the pressure mesh sheets.

[0008] In a preferred embodiment, both the return line and the pressure plate are flexible components. The return line is symmetrically fixed at both ends of the pressure plate, and drives the pressure plate to bend and deform synchronously during the cyclical movement of the return line around the guide roller and the drive roller. Specifically, the flexible pressure plate continuously bends and resets during the cyclical movement, which can create a stress difference between the flux crystallization and solder residue adhering to the surface of the pressure plate, promoting the initial peeling of the solidified deposits and reducing the subsequent cleaning load.

[0009] In a preferred embodiment, the guide bar is further configured as a metal strip structure arranged along the axial direction of the conduction roller, with each piezoelectric vibrator embedded inside the guide bar. Specifically, the guide bar can act as a vibration conduction component, rapidly diffusing the high-frequency vibration generated by the piezoelectric vibrators to the entire pressing mesh sheet, increasing the vibration coverage area, and causing the pressing mesh sheet as a whole to generate micro-amplitude high-frequency vibration, thereby improving the efficiency of loosening the attached material.

[0010] In a preferred embodiment, the electrode slider is a flexible conductor structure, and the surface of the elastic contact is provided with a plurality of conductive contacts. The elastic contact adopts an elastic contact sheet or a flexible copper braided strip structure. Specifically, when the pressure plate moves to the position of the conduction roller, the electrode slider can automatically engage with the elastic contact to conduct electricity, providing AC power to the piezoelectric vibrator; after the pressure plate leaves the conduction roller, the power supply is automatically disconnected, and the cyclic power supply can be completed without setting a moving wire, thereby improving the reliability of the power supply.

[0011] In a preferred embodiment, the electrode guide wheel input is further configured to be electrically connected to an AC drive power supply and a frequency controller. The AC drive power supply provides AC excitation voltage to the piezoelectric vibrator, and the frequency controller adjusts the operating frequency of the piezoelectric vibrator. Specifically, the vibration frequency of the piezoelectric vibrator can be adjusted according to different levels of contamination to maintain high vibration efficiency and improve the ability to clean solidified deposits.

[0012] In a preferred embodiment, the piezoelectric vibrator is further configured as a thin-film piezoelectric ceramic vibrator, with multiple piezoelectric vibrators spaced apart along the length of the conductor strip. Specifically, the thin-film piezoelectric vibrator has a small thickness, making it easy to embed inside the conductor strip without affecting the overall flexibility of the pressure mesh, while also generating higher frequency vibrations to improve the overall vibration uniformity of the pressure mesh.

[0013] In a preferred embodiment, the electrode sliders are further configured such that they are arranged along the return flow direction and correspond to two elastic contacts on the surface of the electrode guide wheel, respectively, for providing conductive connections to both ends of the piezoelectric vibrator. Specifically, the power supply connection and disconnection can be automatically completed during the operation of the pressure plate, realizing dynamic power supply and completing the vibration cleaning process without manual intervention.

[0014] In a preferred embodiment, the air distribution plate has an arc-shaped convex surface and a plurality of air holes evenly distributed on its surface. One end of the blowing seat is connected to a high-pressure air pump, and the air holes on the surface of the air distribution plate face the bottom surface of the pressure mesh. Specifically, high-pressure gas is evenly sprayed out through the air distribution plate, covering the entire width of the pressure mesh, and promptly blowing away contaminants caused by vibration and bending from the surface of the pressure mesh, thereby improving the cleaning effect of the pressure mesh.

[0015] The beneficial effects achieved by this invention are as follows: 1. In this invention, a flexible pressure mesh sheet is used in conjunction with a return line for cyclic transmission. When the pressure mesh sheet passes through the transmission roller and the drive roller, it can repeatedly bend and deform with the return line, causing the surface-cured flux and attached particles to crack and peel off. Subsequently, a piezoelectric vibrator generates high-frequency vibration for secondary shaking, and the high-pressure airflow output from the blower seat is used for three-stage cleaning, forming a multi-stage self-cleaning process of bending desorption, vibration desorption, and airflow cleaning, thereby improving the cleaning effect of the pressure mesh sheet.

[0016] 2. In this invention, by embedding a thin-film piezoelectric vibrator inside the conductor strip, the high-frequency mechanical vibration generated by the piezoelectric vibrator is conducted and diffused along the pressure mesh by the conductor strip. This can improve the vibration area and vibration uniformity, so that all areas of the pressure mesh can obtain vibration cleaning effect, reduce local cleaning dead corners, and improve the efficiency of attachment removal.

[0017] 3. In this invention, by setting an electrode slide bar on the bottom surface of the pressing sheet and setting an electrode guide wheel with an elastic contact on the surface of the conduction roller, when the pressing sheet circulates to a predetermined position, the electrode slide bar automatically connects with the elastic contact, and the AC drive power supply supplies power to the piezoelectric vibrator, so that the piezoelectric vibrator automatically completes the energized vibration cleaning at the end of the string welding operation, without the need for additional moving wires, thus improving the continuity and reliability of the automatic cleaning of the pressing sheet. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention; Figure 2 This is a schematic diagram of the recirculation line and pressure plate installation structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the conductive roller and its surface electrode guide wheel structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the bottom surface structure of the pressure mesh sheet according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the surface structure of the electrode guide wheel according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the bottom structure of the purge seat according to an embodiment of the present invention.

[0019] Figure label: 100. Pressing mesh drive seat; 110. Conducting roller; 120. Drive roller; 130. Return line; 140. Electrode guide wheel; 141. Flexible contact; 200. Pressure plate; 201. Electrode slider; 210. Conductor bar; 220. Piezoelectric vibrator; 300. Purge seat; 310. Air distribution plate. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0021] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0022] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, a self-cleaning grid structure for a photovoltaic module string welding machine.

[0023] Combination Figures 1-6As shown, the present invention provides a self-cleaning mesh pressing structure for a photovoltaic module string welding machine, comprising a mesh pressing drive base 100, a conduction roller 110, a drive roller 120, a return line 130, a plurality of mesh pressing sheets 200, and a cleaning seat 300. The conduction roller 110 and the drive roller 120 are respectively installed at both ends of the mesh pressing drive base 100. The return line 130 is sleeved on the outside of the conduction roller 110 and the drive roller 120 to form a circulating transmission structure. The plurality of mesh pressing sheets 200 are evenly fixed on the surface of the return line 130 and circulate with the return line 130. The cleaning seat 300 is fixedly installed on the surface of the mesh pressing drive base 100 and is used to clean the mesh pressing sheets 200 after welding.

[0024] The guide roller 110 supports and guides the return line 130 in its cyclic operation, while the drive roller 120 is connected to an external drive mechanism to drive the return line 130 in continuous cyclic motion. The return line 130 is made of a flexible material and is fixedly connected to both ends of the pressing sheet 200, allowing the pressing sheet 200 to bend and reset synchronously as the return line 130 passes through the guide roller 110 and the drive roller 120 without affecting the overall cyclic transmission.

[0025] The pressing sheet 200 is a flexible plate structure with guide strips 210 fixedly attached to its bottom surface. The guide strips 210 are metal strips arranged parallel to the axial direction of the guide roller 110. Several piezoelectric vibrators 220 are embedded inside the guide strips 210. Each piezoelectric vibrator 220 is a thin-film piezoelectric ceramic vibrator, arranged at intervals inside the guide strips 210. When the piezoelectric vibrators 220 are energized, they generate high-frequency mechanical vibration, which is uniformly transmitted to the entire pressing sheet 200 through the guide strips 210, causing the pressing sheet 200 to generate micro-amplitude high-frequency vibration as a whole.

[0026] Since the guide bar 210 is made of metal, it not only serves as the mounting base for the piezoelectric vibrator 220, but also as a vibration transmission structure. It rapidly diffuses the local vibration generated by the piezoelectric vibrator 220 to the entire pressure mesh 200, increasing the overall vibration area of ​​the pressure mesh 200. This causes the flux crystals, solder particles, dust, and other contaminants attached to the surface of the pressure mesh 200 to loosen and detach.

[0027] The bottom surface of the pressure plate 200 is also provided with an electrode slider 201. The electrode slider 201 adopts a flexible conductor structure and is arranged along the running direction of the return line 130. The two electrode sliders 201 correspond to the two conductive ends of the piezoelectric vibrator 220 respectively, and are electrically connected to the piezoelectric vibrator 220 to provide power to the piezoelectric vibrator 220.

[0028] An electrode guide wheel 140 is fixedly sleeved on the outer periphery of the conduction roller 110, and the electrode guide wheel 140 rotates synchronously with the conduction roller 110. The surface of the electrode guide wheel 140 is provided with a number of elastic contacts 141. The elastic contacts 141 adopt an elastic contact sheet or a flexible copper braided strip structure, and their surfaces are provided with a number of conductive contacts 142 to improve the conductive contact effect with the electrode slider 201.

[0029] When the pressure plate 200 moves with the return line 130 to the position of the conduction roller 110, the electrode slider 201 automatically engages with the corresponding elastic contact 141, forming a dynamic conductive circuit, allowing the piezoelectric vibrator 220 to receive AC power input. After the pressure plate 200 leaves the conduction roller 110, the electrode slider 201 automatically separates from the elastic contact 141, and the piezoelectric vibrator 220 stops working. Therefore, cyclic power supply can be achieved without the need for additional moving wires.

[0030] In a preferred example, the input terminal of the electrode guide wheel 140 is connected to an AC drive power supply and a frequency controller. The AC drive power supply is used to output an AC excitation voltage to the piezoelectric vibrator 220, and the frequency controller is used to adjust the AC output frequency so that the piezoelectric vibrator 220 operates in a range close to its own resonant frequency, thereby improving vibration efficiency and adjusting the vibration intensity according to different levels of pollution.

[0031] The purging seat 300 is fixedly installed on the surface of the pressing mesh transmission seat 100 and located below the circulation path of the pressing mesh sheet 200. The bottom surface of the purging seat 300 is provided with an air distribution plate 310. The surface of the air distribution plate 310 forms an arc-shaped convex structure, and a number of air holes are evenly opened on its surface. All air holes are arranged facing the bottom surface of the pressing mesh sheet 200.

[0032] One end of the purging seat 300 is connected to a high-pressure air pump. After the high-pressure gas enters the purging seat 300, it is evenly distributed inside the air distribution plate 310 and ejected from each air hole to form a uniform high-speed airflow, which purifies the bottom surface of the pressure mesh 200. The arc-shaped air distribution plate 310 enables the ejected airflow to cover the entire width of the pressure mesh 200, improving the uniformity of purging and reducing local cleaning dead corners.

[0033] When the pressure plate 200 passes the blower seat 300, the piezoelectric vibrator 220 continues to vibrate. The high-frequency vibration can further remove the loosened pollutants from the surface of the pressure plate 200, and the high-pressure airflow will promptly blow the detached pollutants away from the pressure plate 200, so that vibration cleaning and airflow blowing can be carried out simultaneously, thereby improving the overall cleaning efficiency.

[0034] In use, the present invention first activates the active roller 120 to drive the return line 130 to run in a cycle. The return line 130 drives several pressure plates 200 to pass through the welding station in sequence, pressing and guiding the solder strip. After the pressure plate 200 completes the welding task, it continues to move with the return line 130 to the position of the guide roller 110, where it deforms and bends. The surface crystallized deposits are not easily deformed and thus fall off. Furthermore, the elastic contacts 141 on the surface of the electrode slider 201 and the electrode guide wheel 140 automatically engage and conduct. The AC drive power supply supplies power to the piezoelectric vibrator 220, which generates high-frequency vibration, which is transmitted to the entire pressure plate 200 through the guide bar 210, causing the flux crystals, solder particles and dust attached to the surface of the pressure plate 200 to gradually loosen and fall off. Subsequently, the pressure plate 200 continues to move above the purging seat 300. High-pressure gas is evenly sprayed out through the air distribution plate 310 to thoroughly purge the pressure plate 200, promptly removing any contaminants loosened by vibration from its surface. After purging, the pressure plate 200 continues to return to the string welding station via the return line 130 to enter the next cycle. Thus, in each cycle, the three-stage self-cleaning process of flexible bending peeling, high-frequency vibration cleaning, and high-pressure airflow purging is completed sequentially. This allows the surface of the pressure plate 200 to remain clean without machine shutdown, improving string welding quality and the equipment's continuous operation capability.

[0035] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0036] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A self-cleaning wire mesh pressing structure for a photovoltaic module string welding machine, characterized in that, It includes a screen pressing drive base (100), a guide roller (110), a drive roller (120), and a return line (130), wherein the guide roller (110) and the drive roller (120) are arranged on the surface of the screen pressing drive base (100). It also includes several pressing mesh sheets (200) and a purging seat (300) fixed to the surface of the pressing mesh transmission seat (100). The several pressing mesh sheets (200) are evenly distributed on the surface of the return line (130). The bottom surface of the pressure mesh (200) is fixedly attached with a guide strip (210), and a piezoelectric vibrator (220) is embedded in the inner side of the guide strip (210). The bottom surface of the pressure mesh (200) is provided with an electrode slide (201) for inputting electrical energy to the piezoelectric vibrator (220). An electrode guide wheel (140) is fixedly sleeved on the surface of the conduction roller (110). The surface of the electrode guide wheel (140) is provided with an elastic contact (141) for abutting and fitting with the electrode slide (201). The bottom surface of the purging seat (300) is provided with an air distribution plate (310).

2. The self-cleaning mesh pressing structure for a photovoltaic module string welding machine according to claim 1, characterized in that, The return line (130) and the pressing sheet (200) are both flexible components. The return line (130) is symmetrically arranged at both ends of the pressing sheet (200). The drive roller (120) and the transmission roller (110) drive the return line (130) to circulate.

3. The self-cleaning mesh pressing structure for a photovoltaic module string welding machine according to claim 1, characterized in that, The guide bar (210) is a metal strip structure and is arranged in a direction parallel to the axis of the conduction roller (110). Each piezoelectric vibrator (220) is uniformly embedded in the inner side of the guide bar (210) and fixedly connected to the guide bar (210). The guide bar (210) is used to conduct driving electrical energy to each piezoelectric vibrator (220).

4. The self-cleaning mesh pressing structure for a photovoltaic module string welding machine according to claim 1, characterized in that, The electrode slider (201) is a flexible conductor structure, and the surface of the elastic contact (141) is provided with a number of conductive contacts (142). The elastic contact (141) is an elastic contact sheet or a flexible copper braided strip structure.

5. The self-cleaning mesh pressing structure for a photovoltaic module string welding machine according to claim 1, characterized in that, The input end of the electrode guide wheel (140) is electrically connected to an AC drive power supply and a frequency controller. The frequency controller is used to adjust the frequency of the alternating current output by the AC drive power supply to drive the piezoelectric vibrator (220) to generate mechanical vibration at the corresponding frequency.

6. The self-cleaning mesh pressing structure for a photovoltaic module string welding machine according to claim 1, characterized in that, The piezoelectric vibrator (220) is a sheet-shaped piezoelectric ceramic vibrator. The piezoelectric vibrator (220) is fixedly embedded inside the conductor (210) and outputs vibration in the direction of the pressure mesh (200). The piezoelectric vibrator (220) generates high-frequency vibration under the action of alternating current.

7. The self-cleaning mesh pressing structure for a photovoltaic module string welding machine according to claim 1, characterized in that, The electrode slider (201) is arranged parallel to the direction of movement of the return line (130). The two electrode sliders (201) respectively abut against the two elastic contacts (141) on the surface of the electrode guide wheel (140) to form a two-pole conductive connection to the piezoelectric vibrator (220).

8. The self-cleaning mesh pressing structure for a photovoltaic module string welding machine according to claim 1, characterized in that, The air distribution plate (310) has an arc-shaped guide surface that protrudes towards the pressure mesh (200) on its surface, and a number of air jet holes are evenly opened on the surface of the air distribution plate (310). One end of the purging seat (300) is connected to a high-pressure air pump. The high-pressure gas output by the high-pressure air pump is ejected through a number of air jet holes on the surface of the air distribution plate (310) to purge and clean the pressure mesh (200) that is circulating through it.

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