Glue coating process of photovoltaic edge protection plate

Abstract

The invention belongs to the technical field of photovoltaic module production, and discloses a photovoltaic edge protection plate glue coating process which comprises the following steps: S1, melting and extruding photovoltaic edge protection plate raw materials through a double-screw extruder, and keeping the extruded edge protection plate to move linearly under the action of a traction mechanism; s2, the extruded edge protecting plate is cooled and shaped through cooling equipment; s3, arranging glue coating equipment at the tail end of the cooling equipment, and coating an EVA (Ethylene Vinyl Acetate) glue film on the surface of the edge protecting plate on line through the glue coating equipment; s4, a pressing mechanism is adopted for rolling the edge protecting plate coated with the adhesive, so that the EVA adhesive film is tightly attached to the surface of the edge protecting plate; and S5, fixed-length cutting is conducted on the edge protecting plate coated with the glue through a cutting mechanism. According to the process, the mode of direct online glue coating after extrusion molding is adopted, the steps of intermediate transfer and secondary processing in a traditional process are omitted, the production efficiency is greatly improved, and the process is suitable for continuous large-scale production.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic module production, and more particularly to a glue coating process for photovoltaic edge guard plates. Background Art

[0002] PV edge guards are a crucial component of photovoltaic modules, primarily used to protect the edges of photovoltaic panels from moisture and dust intrusion, while also enhancing the structural strength and durability of the modules. PV edge guard lamination involves applying or adhering EVA (ethylene-vinyl acetate copolymer) film to the surface or joints of the edge guards of photovoltaic modules.

[0003] Traditional edge guard laminating processes typically involve forming the panels first and then laminating them. This involves producing the panels first and then applying or laminating the adhesive film offline. This approach suffers from low production efficiency, insufficient adhesion between the film and the substrate, and the generation of bubbles and wrinkles, which compromise the product's sealing and long-term reliability. Therefore, an efficient, stable, and integrated photovoltaic edge guard laminating process is urgently needed to improve production efficiency, optimize adhesive film lamination quality, and reduce production costs. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a photovoltaic edge guard board coating process.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] A photovoltaic edge plate coating process includes the following steps:

[0007] S1. The photovoltaic edge plate raw material is melted and extruded through a twin-screw extruder, and the extruded edge plate is kept moving in a straight line under the action of a traction mechanism;

[0008] S2. The extruded edge plate is cooled and shaped by a cooling device;

[0009] S3. A coating device is provided at the tail end of the cooling device, and the coating device is applied online to the surface of the edge plate to cover the EVA film;

[0010] S4. Use a laminating mechanism to roll the coated edge guard to ensure that the EVA film is tightly bonded to the edge guard surface;

[0011] S5. The edge guard plate coated with glue is cut to a fixed length by a cutting mechanism.

[0012] As a further solution of the present invention: the cooling device is arranged at the tail end of the twin-screw extruder, the cooling device includes a cooling water tank, the cooling water tank has a hollow annular cavity, the surface of the cooling water tank is symmetrically provided with through holes for the edge guard to pass through, and the surface of the cooling water tank is provided with a water inlet pipe and a water outlet pipe connected to the interior thereof;

[0013] The cooling water tank is provided with a spraying mechanism coaxial with the axis of travel of the edge guard plate, and the water inlet pipe is connected to a connecting pipe, which is in communication with the spraying mechanism;

[0014] The connecting pipe is a telescopic hose, and the cooling water tank is provided with a rotation driving mechanism, which drives the spraying mechanism to rotate.

[0015] As a further solution of the present invention: a water tank is provided below the cooling device, a bracket is provided on the water tank, and the cooling device, the glue coating device and the pressing mechanism are fixedly mounted on the water tank via the bracket.

[0016] As a further solution of the present invention: the glue coating equipment includes a first support rod, the first support rod is fixedly mounted on the bracket, a film material roller is rotatably mounted on the first support rod, an EVA film roll is mounted on the film material roller, and the EVA film roll is used to unwind the EVA film strip, a second support rod is provided on one side of the first support rod, a guide roller is provided on the second support rod, a guide wheel is provided on the guide roller, the guide roller is arranged perpendicular to the edge guard plate, and the guide wheel corresponds to and adapts to the edge guard plate.

[0017] As a further solution of the present invention: the number of the guide rollers is two, the pressing mechanism is located between the two guide rollers, the pressing mechanism includes an L-shaped fixing frame, an electric telescopic rod is fixedly installed at the bottom of the L-shaped fixing frame, the bottom end of the electric telescopic rod is fixedly connected to a U-shaped frame, the U-shaped frame is connected to a pressing roller, and the pressing roller is arranged in a cross-shaped vertical correspondence with the edge guard plate.

[0018] As a further solution of the present invention: the spraying mechanism comprises several annular tubes arranged at equal distances in the cooling water tank along the extension direction of the edge guard plate, several nozzles are arranged on the inner side of the annular tubes, the edge guard plate passes through the annular tubes, and connecting tubes are connected between adjacent annular tubes. The connecting tubes are connected to one of the annular tubes or the connecting tubes, and the outermost annular tube is connected to the rotating drive mechanism.

[0019] As a further solution of the present invention: the rotary drive mechanism includes a fixed ring fixedly mounted on the inner wall of the cooling water tank and located outside the through hole, the fixed ring being rotatably connected to a rotating outer gear ring, the surface of the rotating outer gear ring being evenly provided with connecting rods, the connecting rods being fixedly connected to the annular tube;

[0020] A gear is meshed on the outer side of the rotating outer gear ring, a servo motor is fixedly mounted on the cooling water tank, an output shaft of the servo motor is fixedly connected to a rotating shaft, and the rotating shaft is fixedly connected to the gear.

[0021] As a further solution of the present invention: the cooling water tank includes a lower shell and an upper shell, and the lower shell and the upper shell are combined by a hinge to form an openable and closable cylindrical structure. A sealing layer is provided at the connection between the lower shell and the upper shell, and the through hole, water inlet pipe, water outlet pipe and fixing ring are all provided on the lower shell.

[0022] As a further solution of the present invention: the extrusion temperature of the twin-screw extruder in step S1 is 180-220° C., and the screw speed is 30-60 rpm.

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] 1. Online integrated production to improve efficiency: This process adopts the method of direct online coating after extrusion molding, eliminating the intermediate transfer and secondary processing steps in traditional processes, greatly improving production efficiency, and is suitable for continuous large-scale production.

[0025] 2. Enhance the bonding strength of the adhesive film: Use the pressing mechanism to roll the edge guard after adhesive coating to ensure that the EVA film fits tightly to the surface of the edge guard, reduce bubbles and wrinkles, and improve bonding strength and sealing.

[0026] 3. High process stability: After cooling and shaping, the edge guard directly enters the gluing process. The substrate temperature is moderate, which is conducive to the uniform bonding of the EVA film and avoids poor bonding caused by thermal deformation or cooling shrinkage.

[0027] 4. Reduce costs: Integrated production reduces manual intervention and energy consumption, while also reducing scrap rates and overall production costs. During the cooling and shaping process, dynamic spraying is used to enhance the contact efficiency between water and the edge guard, which is faster and more efficient than static immersion or one-way spraying.

[0028] In summary, this process achieves efficient and high-quality adhesive coating of photovoltaic edge guards by optimizing the production process, providing reliable guarantee for the long-term stable operation of photovoltaic modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention;

[0030] Figure 2 It is a structural schematic diagram of the glue coating equipment of the present invention;

[0031] Figure 3 It is a structural schematic diagram of the spraying mechanism of the present invention;

[0032] Figure 4It is a structural schematic diagram of the rotary drive mechanism of the present invention;

[0033] Figure 5 It is a structural schematic diagram of the pressing mechanism of the present invention.

[0034] Description of the numbers in the figure:

[0035] 1. Twin screw extruder;

[0036] 2. Cooling equipment; 21. Cooling water tank; 211. Lower shell; 212. Upper shell; 22. Through hole; 23. Water inlet pipe; 24. Water outlet pipe; 25. Spraying mechanism; 251. Annular pipe; 252. Spray head; 253. Connecting pipe; 26. Connecting pipe; 27. Rotary drive mechanism; 271. Fixed ring; 272. Rotating outer gear ring; 273. Connecting rod; 274. Gear; 275. Servo motor; 276. Rotating shaft;

[0037] 3. Glue coating equipment; 31. First support rod; 32. Film material roller; 33. EVA film roll; 331. EVA film strip; 34. Second support rod; 35. Guide roller; 36. Guide wheel;

[0038] 4. Pressing mechanism; 41. L-shaped fixing frame; 42. Electric telescopic rod; 43. U-shaped frame; 44. Pressing roller;

[0039] 5. Sink;

[0040] 6. Bracket;

[0041] 7. Control cabinet. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] Example 1

[0044] See also Figure 1-5 A photovoltaic edge plate coating process includes the following steps:

[0045] S1 melt extrusion: The photovoltaic edge plate raw material is melt extruded by a twin-screw extruder 1 at 200 ℃ and a screw speed of 40 rpm, and the traction mechanism keeps the edge plate moving in a straight line;

[0046] S2 cooling shaping: The extruded edge plate enters the cooling water tank 21 of the cooling device 2, and is sprayed with cooling water by the fixed annular nozzle 252 for cooling and shaping;

[0047] S3 online coating: After cooling, the edge plate passes through the coating device 3, the EVA film roll 33 unwinds the EVA film strip 331 through the guide roller 35 attached to the edge plate surface;

[0048] S4 roller lamination: the lamination mechanism 4 pressure roller 44 down, so that the EVA film and the edge plate surface closely fit;

[0049] S5. Cut to length: The glue-coated edge guard is cut to length by a cutting mechanism. The cutting mechanism uses a servo-driven flying saw device, and the cutting accuracy is controlled within ±0.5mm.

[0050] This technical solution realizes integrated continuous operation, coating with glue during production, which not only ensures the speed of coating but also improves the quality of production.

[0051] Example 2: Rotary spray enhanced cooling process

[0052] Based on the above embodiment, further improvements are made:

[0053] Step S1, segmented temperature control: twin-screw extruder 1 is temperature controlled in different zones (feeding zone 180° C., homogenizing zone 220° C.), and the screw speed is 50 rpm.

[0054] Step S2, dynamic cooling: a rotating spraying mechanism 25 is set in the cooling water tank 21, and the servo motor 275 drives the hard annular tube 251 to rotate forward and reverse, and the nozzle 252 evenly sprays cooling water. The cooling water covers the entire surface of the edge guard through the rotating nozzle 252, thereby improving the cooling efficiency and avoiding local overheating.

[0055] The pressing mechanism 4 in S4 uses an electric telescopic rod 42 to automatically adjust the pressure (pressure range 0.2-0.5 MPa).

[0056] Example 3

[0057] See also Figure 1-4 Based on the above, the present invention also provides a gluing device for photovoltaic edge guard boards, including a twin-screw extruder 1, a cooling device 2 is provided at the tail end of the twin-screw extruder, a gluing device 3 is provided at the tail end of the cooling device 2, a pressing mechanism 4 is provided on one side of the gluing device, and a control cabinet 7 is provided on one side of the twin-screw extruder 1.

[0058] Specifically, such as Figure 2-4As shown, the cooling device 2 is disposed at the tail end of the twin-screw extruder 1. The cooling device 2 includes a cooling water tank 21, which has a hollow annular cavity. Symmetrically, through-holes 22 are provided on the surface of the cooling water tank 21 for the edge guards to pass through. The edge guards pass through the through-holes 22 into the water tank interior and move along the travel axis. The surface of the cooling water tank 21 is provided with an inlet pipe 23 and an outlet pipe 24 that communicate with the interior. Cooling water is injected into the cooling water tank 21 through the inlet pipe 23, and hot water is discharged from the outlet pipe 24, forming a circulating cooling system that maintains a stable water temperature within the water tank. A spraying mechanism 25 is provided within the cooling water tank 21, which is coaxial with the travel axis of the edge guards. A connecting pipe 26 is connected to the inlet pipe 23, which is in communication with the spraying mechanism 25. The spraying mechanism 25 evenly sprays cooling water onto the surface of the edge guards, achieving rapid cooling. The cooling water tank 21 is equipped with a rotary drive mechanism 27, which drives the spray mechanism 25 to rotate. This causes the spray mechanism 25 to rotate, so that the cooling water covers the edge guard surface in a spiral trajectory, preventing localized overheating. The connecting pipe 26 is a telescopic hose that maintains water connectivity during the rotation of the spray mechanism 25 and accommodates the displacement caused by the rotation.

[0059] The cooling device 2 of this embodiment uses dynamic spraying to enhance the contact efficiency between water and the edge guard plate, which is faster than static immersion or one-way spraying.

[0060] Among them, Figure 3 As shown, the spraying mechanism 25 comprises a number of annular tubes 251 equidistantly arranged within the cooling water tank 21 along the extension direction of the edge guard. Several nozzles 252 are disposed on the inner sides of the annular tubes 251. The edge guard passes through the annular tubes 251. Connecting tubes 253 connect adjacent annular tubes 251. A connecting tube 26 communicates with one of the annular tubes 251 or the connecting tubes 253. The outermost annular tube 251 is connected to the rotary drive mechanism 27. Furthermore, reinforcing rods are connected between adjacent annular tubes 251 to ensure the stability of the spraying mechanism 25.

[0061] In the spraying mechanism 25 of this embodiment, the external water source enters the connecting pipe 26 (telescopic hose) through the water inlet pipe 23, and flows into the annular pipe 251 or the connecting pipe 253, and is finally distributed to all the annular pipes 251. The nozzle 252 sprays cooling water toward the surface of the edge guard to ensure uniform coverage. Among them, multiple annular pipes 251 are arranged equidistantly along the extension direction of the edge guard to form a segmented cooling zone, and each section sprays water independently to ensure uniform cooling of the entire edge guard. The edge guard enters from the through hole 22 and passes through the center of all the annular pipes 251. The rotating nozzle 252 will not interfere with its linear motion.

[0062] like Figure 4As shown, the rotary drive mechanism 27 includes a fixed ring 271 fixedly mounted on the inner wall of the cooling water tank 21 and located outside the through hole 22, and a rotating outer gear ring 272 is rotatably connected to the fixed ring 271, and connecting rods 273 are evenly arranged on the surface of the rotating outer gear ring 272, and the connecting rods 273 are fixedly connected to the annular tube 251; a gear 274 is meshed on the outer side of the rotating outer gear ring 272, and a servo motor 275 is fixedly mounted on the cooling water tank 21, and the output shaft of the servo motor 275 is fixedly connected to a rotating shaft 276, and the rotating shaft 276 is fixedly connected to the gear 274.

[0063] In this embodiment, the rotary drive mechanism 27 activates a servo motor 275 through a control cabinet, which drives a rotating shaft 276 to rotate a gear 274. This gear 274 engages with a rotating outer gear ring 272, causing it to rotate. The rotating outer gear ring 272, via a connecting rod 273, drives all annular tubes 251 to rotate synchronously, allowing the nozzles 252 to dynamically spray along the circumference of the edge guard, avoiding blind spots in the cooling process.

[0064] Specifically, such as Figure 2 As shown, the laminating device 3 includes a first support rod 31, fixedly mounted on a bracket 6. A film roller 32 is rotatably mounted on the first support rod 31, on which an EVA film roll 33 is mounted. The EVA film roll 33 is used to unwind an EVA film strip 331. A second support rod 34 is disposed on one side of the first support rod 31. A guide roller 35 is mounted on the second support rod 34, and a guide wheel 36 is mounted on the guide roller 35. The guide roller 35 is positioned perpendicular to the edge guard, and the guide wheel 36 corresponds to and adapts to the edge guard. Two guide rollers 35 are configured, and the EVA film is precisely adhered after two deviation corrections. The EVA film roll 33 is mounted on the film roller 32, which rotates the first support rod 31 to continuously unwind the EVA film strip 331. The unwound EVA film strip 331 is guided and corrected by the two guide rollers 35 and the guide wheel 36.

[0065] When the EVA film strip 331 passes the first guide roller 35, the guide wheel 36 is aligned perpendicularly with the edge guard, preliminarily adjusting the film's position to ensure alignment with the edge guard. The EVA film strip 331 then passes the second guide roller 35, correcting any lateral deviation and achieving precise positioning of the EVA film strip 331.

[0066] Specifically, such as Figure 2As shown, the laminating mechanism 4 is located between the two guide rollers 35 and includes an L-shaped mounting bracket 41. A motorized telescopic rod 42 is fixedly mounted to the bottom of the L-shaped mounting bracket 41. A U-shaped bracket 43 is fixedly connected to the bottom end of the motorized telescopic rod 42. The U-shaped bracket 43 is connected to a pressing roller 44. The pressing roller 44 is arranged perpendicularly to the edge guard in a cross-like pattern. A pressure sensor is installed at the bottom of the pressing roller 44. This sensor monitors the laminating pressure in real time and automatically adjusts the stroke of the motorized telescopic rod 42.

[0067] The laminating mechanism 4 is located between the two guide rollers 35. An electrically operated telescopic rod 42 drives a U-shaped frame 43 downward, causing a pressure roller 44 to vertically press the film and edge guard together. A pressure sensor at the base of the pressure roller 44 monitors the laminating pressure in real time, providing feedback to the control system, which dynamically adjusts the stroke of the electrically operated telescopic rod 42 to ensure constant pressure and avoid overpressure or loose bonding. After two rounds of correction and pressure regulation, the EVA film strip 331 is stably bonded to the edge guard, and the finished product is subsequently processed by other mechanisms (such as a cutting device).

[0068] In addition, a water tank 5 is provided below the cooling device 2, and a bracket 6 is provided on the water tank 5. The cooling device 2, the glue coating device 3 and the pressing mechanism 4 are fixedly installed on the water tank 5 through the bracket 6. The cooling water flows back to the water tank 5 through the outlet pipe 24 and can be recycled after being filtered through the cooling device.

[0069] The cooling water tank 21 comprises a lower shell 211 and an upper shell 212. The lower shell 211 and the upper shell 212 are hinged together to form an openable and closable structure. A sealing layer is provided at the connection between the lower shell 211 and the upper shell 212. The through hole 22, water inlet pipe 23, water outlet pipe 24, and fixing ring 271 are all provided on the lower shell 211. The cooling water tank 21 adopts an openable and closable cylindrical structure (lower shell 211 + upper shell 212), which facilitates maintenance and management of the internal mechanisms.

[0070] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A photovoltaic edge plate coating process, characterized by: The following steps are involved: S1. The photovoltaic edge plate raw material is melted and extruded by a twin-screw extruder (1). The extruded edge plate is kept moving in a straight line under the action of a traction mechanism; S2. The extruded edge plate is cooled and shaped by a cooling device (2); S3. A coating device (3) is provided at the tail end of the cooling device (2), and an EVA film is applied online to the surface of the edge plate by the coating device (3); S4 using a pressing mechanism (4) after the coating of the edge plate roller, so that the EVA film and edge plate surface closely fit; S5. The edge guard plate coated with glue is cut to a fixed length by a cutting mechanism.

2. The adhesive coating process for photovoltaic edge guards according to claim 1, characterized in that: The cooling device (2) is arranged at the tail end of the twin-screw extruder (1), and the cooling device (2) includes a cooling water tank (21). The cooling water tank (21) has a hollow annular cavity therein, and the surface of the cooling water tank (21) is symmetrically provided with through holes (22) for the edge guard plate to pass through. The surface of the cooling water tank (21) is provided with a water inlet pipe (23) and a water outlet pipe (24) communicating with the interior thereof; A spray mechanism (25) coaxial with the axis of travel of the edge guard plate is provided in the cooling water tank (21); a connecting pipe (26) is connected to the water inlet pipe (23); and the connecting pipe (26) is in communication with the spray mechanism (25); The connecting pipe (26) is a telescopic hose. A rotation drive mechanism (27) is provided on the cooling water tank (21). The rotation drive mechanism (27) drives the spraying mechanism (25) to rotate.

3. The adhesive coating process for photovoltaic edge guards according to claim 2, characterized in that: A water tank (5) is provided below the cooling device (2), a bracket (6) is provided on the water tank (5), and the cooling device (2), the glue coating device (3) and the pressing mechanism (4) are fixedly mounted on the water tank (5) via the bracket (6).

4. The adhesive coating process for photovoltaic edge guards according to claim 3, characterized in that: The coating device (3) includes a first support rod (31), the first support rod (31) is fixedly mounted on a bracket (6), a film roller (32) is rotatably mounted on the first support rod (31), an EVA film roll (33) is mounted on the film roller (32), and the EVA film roll (33) is used to unwind an EVA film strip (331), a second support rod (34) is provided on one side of the first support rod (31), a guide roller (35) is provided on the second support rod (34), a guide wheel (36) is provided on the guide roller (35), the guide roller (35) is vertically arranged with the edge guard plate, and the guide wheel (36) corresponds to and is adapted to the edge guard plate.

5. The adhesive coating process for photovoltaic edge guards according to claim 4, characterized in that: There are two guide rollers (35), and the pressing mechanism (4) is located between the two guide rollers (35). The pressing mechanism (4) comprises an L-shaped fixing frame (41), an electric telescopic rod (42) is fixedly installed at the bottom of the L-shaped fixing frame (41), a U-shaped frame (43) is fixedly connected to the bottom end of the electric telescopic rod (42), and the U-shaped frame (43) is connected to a pressing roller (44), and the pressing roller (44) is arranged perpendicularly to the edge guard plate in a cross shape.

6. The adhesive coating process for photovoltaic edge guards according to claim 1, characterized in that: The spraying mechanism (25) comprises a plurality of annular tubes (251) arranged at equal distances in the extension direction of the edge guard plate in the cooling water tank (21); a plurality of nozzles (252) are arranged on the inner side of the annular tubes (251); the edge guard plate passes through the annular tubes (251); adjacent annular tubes (251) are connected by connecting tubes (253); the connecting tube (26) is connected to one of the annular tubes (251) or the connecting tubes (253); and the outermost annular tube (251) is connected to the rotation drive mechanism (27).

7. The adhesive coating process for photovoltaic edge guards according to claim 2, characterized in that: The rotary drive mechanism (27) includes a fixed ring (271) fixedly mounted on the inner wall of the cooling water tank (21) and located outside the through hole (22); a rotating outer gear ring (272) is rotatably connected to the fixed ring (271); connecting rods (273) are evenly arranged on the surface of the rotating outer gear ring (272); and the connecting rods (273) are fixedly connected to the annular tube (251); A gear (274) is meshed on the outer side of the rotating outer gear ring (272), a servo motor (275) is fixedly mounted on the cooling water tank (21), an output shaft of the servo motor (275) is fixedly connected to a rotating shaft (276), and the rotating shaft (276) is fixedly connected to the gear (274).

8. The adhesive coating process for photovoltaic edge guards according to claim 7, characterized in that: The cooling water tank (21) comprises a lower shell (211) and an upper shell (212); the lower shell (211) and the upper shell (212) are combined by a hinge to form an openable and closable structure; a sealing layer is provided at the connection between the lower shell (211) and the upper shell (212); the through hole (22), the water inlet pipe (23), the water outlet pipe (24) and the fixing ring (271) are all provided on the lower shell (211).

9. The adhesive coating process for photovoltaic edge guards according to claim 1, characterized in that: The extrusion temperature of the twin-screw extruder (1) in step S1 is 180-220°C, and the screw speed is 30-60 rpm.

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