Photovoltaic module laminating machine and photovoltaic module transmission system used by same

Abstract

The invention provides a photovoltaic module laminating machine and a photovoltaic module transmission system used by the photovoltaic module laminating machine, and aims to overcome the defect that in the prior art, the length of a transmission belt of the photovoltaic module laminating machine needs to meet the requirement for increasing the length when a dragging beam assembly passes through a transmission shaft, so that the transmission belt is loosened and droops. Comprising a conveying belt, a conveying belt driving device and a conveying belt tension adjusting mechanism, the conveying belt driving device comprises two parallel transmission chains, a chain transmission driving device, a driving side chain transmission device and a driven side chain transmission device, and the driving side chain transmission device comprises a main transmission roller; according to the photovoltaic module transmission system for the photovoltaic module laminating machine, the length of the conveying belt can be designed, the conveying belt can reach a tightened state, or although the conveying belt is not tightened, the conveying belt cannot make contact with the photovoltaic module of the laminating unit on the lower layer, and the dragging beams which are oppositely arranged up and down cannot make contact with one another.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaic component laminating equipment, and in particular relates to a photovoltaic component laminating machine and a photovoltaic component transmission system used therein. Background Art

[0002] Photovoltaic module laminator is a packaging device for photovoltaic modules, which usually includes a lamination section and a cooling section. The lamination section can adopt a one-cavity structure or a two-cavity structure. The one-cavity lamination section is provided with a lamination cavity, and the lamination and curing of the photovoltaic module are completed in the same lamination cavity. The two-cavity lamination section is provided with two lamination cavities, and the lamination is completed in the first cavity, which is usually called the lamination cavity, and the curing is completed in the second cavity, which is usually called the curing cavity. A photovoltaic module transmission system is required to transmit the photovoltaic modules to the lamination section and the cooling section. One transmission system can be used to transmit the photovoltaic modules, or the lamination section and the cooling section can be provided with photovoltaic module transmission systems respectively. In the prior art, the photovoltaic module transmission system includes a chain transmission device, a conveyor belt and a drag beam assembly (hereinafter referred to as the drag beam) for dragging the conveyor belt. The chain transmission device includes a main transmission shaft, a slave transmission shaft, a chain transmission shaft and a transmission chain. The lamination section and the cooling section both include a workbench. The main transmission roller and the slave transmission shaft are respectively arranged at the front and rear ends of the workbench. Chain transmission shafts are fixedly arranged on both sides of the main transmission roller and the slave transmission roller. A sprocket is arranged on the chain transmission shaft, and the transmission chain is sleeved on the sprocket. The transmission belt usually uses high-temperature cloth, usually including multiple pieces of high-temperature cloth. Each section of the high-temperature cloth is fixedly connected by a drag beam to form a ring structure. The ends of each section of the high-temperature cloth are arranged along the length direction of the drag beam and are fixedly connected to the drag beam. The two ends of the drag beam are respectively fixedly connected to the transmission chain on the corresponding side, so that the conveyor belt is arranged around the main transmission shaft, the slave transmission shaft and the workbench, and runs around the three. According to conventional design theory, the design length of the transmission chain is equal to the sum of the distance between the center lines of the two chain transmission shafts and the diameter of the sprocket multiplied by a certain tension coefficient. The theoretical design length of the transmission belt is equal to the total length of the transmission chain plus the difference between the circumference of the chain transmission shaft and the transmission roller. However, since the drag beam itself has a dimensional thickness, when the drag beam passes through the transmission shaft, the transmission belt leaves the transmission roller under the dragging action of the drag beam, causing the transmission belt of the theoretical design length to tear when passing through the transmission roller, and there is a risk of tearing. For this reason, the length of the transmission belt is usually designed to be longer, equal to the theoretical design length of the transmission belt plus the distance between the intersection of the drag beam and the transmission belt and the surface of the transmission roller, and the length of the transmission chain will also change accordingly with the change of the transmission load size. When the load becomes larger, the transmission chain will increase accordingly. At this time, the design of the transmission belt length needs to consider increasing this length, but if this increased length is too long, it will cause wrinkles in the transmission belt during the process of laminating photovoltaic modules. This causes the conveyor belt to sag when the drag beam does not pass over the transmission roller. Usually two drag beams are used to connect two sections of high-temperature cloth. The lengths of the two sections of high-temperature cloth are equal. In one conveyor belt cycle, there are two times when the drag beam passes over the transmission roller. The rest of the time is when the conveyor belt contacts the transmission roller and passes over the transmission roller. Therefore, the conveyor belt sags almost throughout the entire lamination process.As the transmission chain grows accordingly, in order to smoothly transmit the transmission belt, when the dragging beam does not pass the transmission roller, it is necessary to tension the transmission chain through a chain tensioner or other tensioning device, which increases the torque of the chain drive device and may cause the transmission chain to break or the transmission shaft to break.

[0003] In order to improve the lamination efficiency of photovoltaic module laminators, multi-layer photovoltaic module laminators have emerged. Each layer of the laminator is completed by a lamination unit for lamination and by a cooling unit for cooling. Each lamination unit includes a workbench, a drive roller and a conveyor belt. Drive rollers are arranged on the front and rear sides of the workbench, and the conveyor belt is arranged around the drive roller and the workbench. Sprockets are arranged on both sides of the drive roller, and the conveyor chain is arranged around the sprocket. The width direction of the conveyor belt is fixedly connected to the drag beam assembly, and the two ends of the drag beam assembly are respectively fixedly connected to the corresponding side conveyor chains, so that the conveyor chain can drive the conveyor belt to circulate around the workbench and the drive roller. When the dragging beam does not pass the transmission roller, the conveyor belt runs around the transmission rollers at the front and rear ends. When passing the transmission roller, the conveyor belt and the surface of the transmission roller are in a semi-covered state. When the dragging beam passes the transmission roller, since the end of the conveyor belt is fixed by the dragging beam, there needs to be a certain distance between the dragging beam and the transmission roller. Therefore, under the action of the dragging beam, a part of the conveyor belt will leave the surface of the transmission roller, especially when the dragging beam passes the outermost surface of the transmission roller, the radius of the conveyor belt around the transmission roller increases to the maximum, which causes the required length of the conveyor belt to be inconsistent. When the dragging beam passes the transmission roller, the required length of the conveyor belt is long, and when it does not pass the transmission roller, the required conveyor belt is short. In order for the dragging beam assembly to drag the conveyor belt through the transmission roller smoothly, the conveyor belt needs to be made according to the length of the conveyor belt required when the dragging beam passes the transmission roller. Therefore, the conveyor belt is looser and droops when the dragging beam does not pass the transmission roller than when the dragging beam passes the transmission roller, or the conveyor belt is looser and droops when one dragging beam passes the transmission roller compared with two dragging beams passing the transmission roller at the same time. Since the distance between the upper and lower layers of a multi-layer photovoltaic module is small, the conveyor belt will come into contact with the photovoltaic modules and the conveyor belt for transporting the photovoltaic modules on the workbench below, which will affect the normal operation of the conveyor belt and rub the adhesive on the upper conveyor belt onto the surface of the photovoltaic module, resulting in defective products. In addition, the adhesive on the conveyor belt will be carried to the next working chamber and form dirt on the surface of the photovoltaic module, forming a surface, resulting in a large amount of labor for subsequent manual cleaning, high operating costs, and poor economic benefits; the sagging of the conveyor belt will also cause the photovoltaic module to shift during the closing process of the lamination chamber, resulting in dirty surfaces on the photovoltaic module after lamination.In order to solve the problem of conveyor belt sagging and reduce the amount of conveyor belt sagging, existing technologies have tried, for example, the conveyor belt is set according to the length required when the drag beam does not pass the transmission roller, and a spring or a high-temperature resistant rubber belt is set at the tail end of the conveyor belt. The spring or the high-temperature resistant rubber belt is connected to the pull rod to compensate for the increase in the length of the conveyor belt required when the drag beam passes the transmission roller. However, due to the inconsistent tension of multiple springs or high-temperature resistant rubber belts, the high-temperature cloth is wrinkled and torn. Since the conveyor belt of the upper lamination unit is also the cover cloth of the lower transmission unit, when the battery assembly is During lamination, the conveyor belt of the upper lamination unit covers the surface of the photovoltaic module. When wrinkles appear on the conveyor belt, the wrinkles can easily cause the photovoltaic module to burst during the lamination process. To solve this problem, the prior art also attempts to increase the height of the cover opening to 150 mm or above, add pads to the tower-type support structure, and reduce the reserved space at the top. However, these improvements are bound to result in reduced production efficiency and space utilization, and increase the distance between the opening and closing covers, resulting in greater heat loss in the chamber, increased energy consumption of the equipment, and poor economic benefits. Summary of the invention

[0004] The purpose of the present invention is to provide a photovoltaic module laminator and a photovoltaic module transmission system used therein to address the problem that the length of the conveyor belt of the prior art photovoltaic module laminator needs to meet the need to increase the length when the drag beam assembly passes through the transmission shaft, causing the conveyor belt to sag.

[0005] The technical solution of the present invention to solve the technical problem is as follows: A photovoltaic module transmission system used in a photovoltaic module laminating machine includes a transmission belt, a transmission belt driving device and a transmission belt tension adjustment mechanism, the transmission belt driving device includes two parallel transmission chains, a chain transmission driving device, an active side chain transmission device and a driven side chain transmission device, the active side chain transmission device includes a main transmission roller, a driving sprocket shaft is concentrically fixedly arranged at both ends of the main transmission roller, a driving sprocket is fixedly arranged on the driving sprocket shaft, the main transmission roller is connected to the chain transmission driving device, the driven side chain transmission device includes a driven roller and a driven sprocket, driven sprockets are arranged on both sides of the driven roller, the driven roller is arranged parallel to the main transmission roller, the two transmission chains are respectively connected to the driving sprocket and the driven sprocket on the corresponding side, the driven roller is a driven sprocket shaft, the driven sprocket shaft is parallel to the driving sprocket shaft and the spacing is fixed, the driven sprocket is arranged on the driven sprocket shaft, the transmission belt tension adjustment mechanism includes a tension adjustment actuator, a driven roller, a driven roller fixing sleeve, a driven The roller fixing sleeve is arranged outside the driven sprocket shaft, and the two ends of the driven roller are rotatably arranged outside the driven roller fixing sleeve. There is a certain distance between the driven roller fixing sleeve and the driven sprocket shaft in the running direction of the transmission belt. One end of the driven roller fixing sleeve is located on the inner side of the driven roller, and the other end is located on the outer side of the driven roller. There is no connection between the driven roller sleeve and the driven sprocket shaft. The output end of the tension adjustment actuator is fixedly connected with the end of the driven roller fixing sleeve located on the outer side of the driven roller through a push-pull arm. The driven roller and the driven roller fixing sleeve are both supported by the push-pull arm. Under the drive of the tension adjustment actuator, the push-pull arm reciprocates to drive the driven roller sleeve to reciprocate along the running direction of the transmission belt, thereby driving the driven roller to reciprocate along the running direction of the transmission belt, thereby adjusting the distance between the driven roller and the main transmission roller so that the two are close to or away from each other. The distance between the driven roller and the main transmission roller is greater than or equal to the length of the transmission belt that needs to be increased when the drag beam assembly passes around the transmission roller. The driven sprocket shaft is a through shaft or two short shafts with a common center line, and / or the roller fixing sleeve is a through shaft sleeve or two short shaft sleeves with a common center line; or the tension adjustment actuator is a servo drive mechanism, and the servo drive mechanism is a servo motor, a servo hydraulic cylinder, a servo cylinder, or a servo electric cylinder; or a tension adjustment actuator is respectively arranged on both sides of the length of the driven roller and fixedly connected to the driven roller fixing sleeve on the corresponding side through a push-pull arm; The outer diameters of the main driving roller and the driven roller are equal or unequal, and the outer diameters of the driven sprocket shaft and the driving sprocket shaft are equal or unequal; The length of the conveyor belt is greater than or equal to the total length required when the conveyor belt wraps around the drive rollers on both sides, that is, the sum of the centerline spacing of the drive rollers on both sides and the radius of the two drive rollers, and less than the total length of the conveyor belt when the conveyor belt sags to the maximum limit length of the sag when the conveyor belt wraps around the drive rollers on both sides; or the length of the conveyor belt is the theoretical design length of the conveyor belt, and the theoretical design length of the conveyor belt is the sum of the centerline spacing between the main drive roller and the driven roller and the radius of the driven roller and the main drive roller multiplied by a coefficient, and the coefficient is greater than or equal to 1 and less than or equal to 1.01; It also includes a tension control system, which includes a drag beam assembly position detection device and a control device, wherein the output end of the control device is connected to the tension adjustment actuator by electrical signals, and the input end of the control device is connected to the drag beam assembly position detection device by electrical signals. When the drag beam assembly position detection device detects that the drag beam assembly is running around the transmission roller, the control device controls the tension adjustment actuator to drive the driven roller to move and change the distance between the main transmission roller and the driven roller so that the conveyor belt can smoothly pass through the main transmission roller and / or the driven roller and the drooping length of the conveyor belt is less than the drooping length of the conveyor belt to the maximum limit of the drooping length of the conveyor belt; When the drag beam assembly position detection device detects that the drag beam assembly moves from position X2 to position X3, the control device controls the tension adjustment actuator to drive the driven roller to move toward the main transmission roller; when the drag beam assembly position detection device detects that the drag beam assembly moves from position X3 to position X2, the control device controls the tension adjustment actuator to drive the driven roller to move with the main transmission roller on its back; or the tension control device is a PLC; or the transmission chain is a precision transmission roller chain; When the drag beam assembly position detection device detects that the drag beam assembly moves from position X2 to position X3 and then to position X4, the control device controls the tension adjustment actuator to drive the driven roller to move synchronously toward or behind the main drive roller to keep the conveyor belt at a constant tension; The position detection device of the drag beam assembly is a position sensor, which is fixedly arranged at a position corresponding to the X2 and X3 point positions of the transmission roller; or the position sensor is a speed sensor, which is fixedly arranged at a position corresponding to the X2 and X3 point positions of the transmission roller, and determines whether the position of the drag beam assembly reaches the X2 and X3 points by sensing the speed change of the transmission belt; or the position sensor is a torque sensor, which is used to detect the torque change of the output shaft of the driving motor of the chain transmission drive device. When it is detected that the torque of the chain transmission drive device shaft is reduced, the tension adjustment actuator is actuated to increase the distance between the driven roller and the main transmission roller.

[0006] A photovoltaic module laminator, comprising a workbench and a photovoltaic module transmission system, wherein the photovoltaic module transmission system adopts the above-mentioned structure, the main drive roller and the driven roller are respectively located at the front end and the rear end of the workbench, and the transmission belt is arranged around the main drive roller, the driven roller and the workbench, or the laminator is a multi-layer laminator, each layer of the laminator comprises a laminating unit, each laminating unit is arranged in an upper and lower layer, each laminating unit comprises a workbench and a photovoltaic module transmission system, wherein the photovoltaic module transmission system adopts the above-mentioned structure, the main drive roller and the driven roller are respectively located at the front end and the rear end of the workbench, and the transmission belt is arranged around the main drive roller, the driven roller and the workbench, and the transmission belt of the upper laminating unit is the photovoltaic module covering belt of the lower laminating unit;

[0007] The workbench is a heating plate or a cooling plate, or includes both a heating plate and a cooling plate, and the heating plate and the cooling plate are arranged front and back.

[0008] The advantages and beneficial effects of the present invention are: The photovoltaic module transmission system used in the photovoltaic module laminating machine adopting the structure of the present invention has a driven roller that adopts a driven sprocket shaft and a driven roller that are separately arranged, and the driven roller can move toward or away from the driven sprocket shaft under the drive of the tension adjustment mechanism, thereby changing the distance between the driven roller and the main drive roller. When the transmission belt passes around the transmission roller, the tension adjustment mechanism drives the driven roller to move toward or away from the main transmission roller, thereby changing the distance between the main transmission roller and the driven roller to compensate for the increased transmission radius of the transmission belt when the drag beam passes around the transmission roller. Therefore, the length of the transmission belt can be made to adopt the designed length, and the transmission belt can be made to be taut, or although it is not taut, it will not contact the photovoltaic modules of the lower lamination unit, and will not cause the drag beams arranged opposite to each other to contact the drag beams. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the structure of a laminating unit in a photovoltaic module laminating machine according to an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the front view of Figure 3 for Figure 2 A is a partial enlarged schematic diagram; Figure 4 for Figure 2 The partially enlarged schematic diagram of C in the middle shows a schematic diagram of the structure of an embodiment of the transmission belt tension adjustment mechanism; Figure 5 This is a schematic structural diagram of an embodiment of a photovoltaic module laminating machine of the present invention; Figure 6 yes Figure 5 Schematic top view of .

[0010] Description of Reference Numerals 1-working table 2-driving side chain transmission device 24-driving sprocket; 25-driving sprocket shaft; 27-main transmission roller; 3-high temperature resistant transmission belt 4-high temperature resistant transmission belt drag beam assembly; 5-chain transmission drive device 6-tension adjustment mechanism 61-driven roller 62-bearing 63-driven roller fixing sleeve 64-push-pull arm 65-tension adjustment actuator 67-tension control system 7-driven side chain transmission device 73-driven sprocket shaft 75-driven sprocket 8-transmission chain DETAILED DESCRIPTION

[0011] The present invention is further described in detail below through specific embodiments. The following embodiments are only descriptive and not restrictive, and the protection scope of the present invention cannot be limited by them. For the convenience of description, the direction parallel to the running direction of the conveyor belt is called front and back, and the direction perpendicular to the conveyor belt is called left and right sides. The length Lz that the conveyor belt needs to increase when the drag beam wraps around the single-sided transmission roller is, Lz=1 / 4×2πR=1 / 4×2π(R1-R0). Where R0 is the radius of the conveyor belt passing through the transmission roller, and R1 is the radius of the conveyor belt and the fixed intersection position of the drag beam passing through the horizontal center line of the transmission roller when the drag beam passes through the transmission roller. That is, Lz is equal to one-fourth of 2π×(R1-R0). The above is a simplified design calculation formula for most engineering applications in the industry. The calculation method will change due to the different structural forms and sizes of the drag beam itself. The maximum limit length of conveyor belt sagging: When used in a single-layer laminator, the maximum limit length of conveyor belt sagging is the sagging length at which the conveyor belt can run completely smoothly. When used in a multi-layer laminator, it is the sagging length when the conveyor belt of the upper lamination unit just contacts the photovoltaic modules of the lower lamination unit.

[0012] like Figure 1-6 As shown, the photovoltaic module laminator of the present invention can be a single-layer laminator or a multi-layer laminator. When it is a multi-layer laminator, the laminating units of each layer are stacked up and down, and each laminating unit includes a workbench 1 and a photovoltaic module transmission system. Each photovoltaic module transmission system includes a high-temperature resistant transmission belt 3 (hereinafter referred to as the transmission belt), a transmission belt driving device and a transmission belt tension adjustment mechanism. The transmission belt driving device includes two parallel transmission chains 8, a chain transmission driving device 5, an active side chain transmission device 2 and a driven side chain transmission device 7. The active side chain transmission device 2 includes a main transmission roller 27, and a driving sprocket shaft 25 is concentrically fixedly arranged at both ends of the main transmission roller, and a driving sprocket 24 is fixedly arranged on the driving sprocket shaft. The main transmission roller 27 fixes the driving sprocket shaft 25 to drive the driving sprocket 24, and supports and guides the transmission belt 3. The main transmission roller is rotatably connected to the frame through the driving sprocket shaft. The main transmission roller is located at one end of the workbench, and the main transmission roller is connected to the chain transmission driving device 5.

[0013] The driven side chain transmission device 7 includes a driven transmission roller and a driven sprocket 75. Driven sprockets are arranged on both sides of the driven transmission roller. The driven transmission roller is located at the other end of the workbench and is arranged parallel to the main transmission roller, so that the front and rear ends of the workbench are respectively provided with a transmission roller, and the driving sprocket and the driven sprocket on the corresponding side are respectively connected by a transmission chain 8, so that a transmission chain is respectively arranged on both sides of the workbench. The conveyor belt is usually made of a high-temperature resistant cloth with Teflon sprayed on the surface. The high-temperature resistant conveyor belt of the same laminating unit is provided with at least two sections of conveyor belts. The conveyor belts of the same laminating unit are fixedly connected by a high-temperature resistant conveyor belt drag beam assembly (hereinafter referred to as the drag beam assembly) 4, that is, the length direction of the drag beam assembly is fixedly connected with the width direction of the end of the conveyor belt. Under normal circumstances, core rod sleeves are respectively provided at both ends of the high-temperature resistant cloth, and the core rod sleeves are arranged along the width of the conveyor belt. The core rod of the drag beam assembly is sleeved in the core rod sleeve, thereby connecting the width direction of the conveyor belt with the length direction of the drag beam, and the two are fixed by the drag beam assembly. The fixing of the drag beam assembly and the conveyor belt is the prior art and will not be described in detail. Under the connection and fixation of the drag beam assembly, the conveyor belt forms an annular belt, and the two ends of the drag beam assembly 4 are respectively fixedly connected with the transmission chain 8 on the corresponding side. The length direction of the drag beam assembly is arranged perpendicular to the running direction of the conveyor belt, and the conveyor belt 3 is arranged around the main transmission roller 53, the workbench 1 and the slave transmission roller. In the present invention, as an improvement, a tension adjustment mechanism 6 for adjusting the tension of the transmission belt is also provided, and the transmission roller adopts the following structure, including a driven sprocket shaft 73 which is parallel to the driving sprocket shaft and fixedly arranged at a distance, the driven sprocket shaft can be a through-shaft structure, extending from one side of the workbench to the other side of the workbench, and driven sprockets are respectively arranged at both ends thereof, or it can be a shaft head structure, and a driven sprocket shaft is respectively arranged on both sides of the workbench, and the driven sprocket is fixedly arranged at the end of the driven sprocket shaft. The transmission belt tension adjustment mechanism includes a driven roller 61, a driven roller fixing sleeve 63, and a tension adjustment actuator 65. When the driven sprocket shaft is a through-shaft, a driven roller fixing sleeve 63 is respectively arranged on the inner side of the driven sprocket at both ends of the driven sprocket shaft, and one end of the outer side of the driven roller is rotatably connected to the driven roller fixing sleeve through a bearing 62, and one end of the driven roller fixing sleeve is located on the inner side of the driven roller, and the other end is located on the outer side of the driven roller.There is no fixed connection between the driven roller sleeve and the driven sprocket shaft. There is a reciprocating movement distance a between the driven roller sleeve and the driven sprocket shaft in the running direction of the transmission belt. This distance a is greater than or equal to the tensioning movement distance of the driven roller, and greater than or equal to the length of the transmission belt required to be increased when the drag beam assembly passes through the transmission roller. The output end of the tension adjustment actuator 65 is fixedly connected to one end of the push-pull arm 64, and the other end of the push-pull arm is fixedly connected to the outer circumference of one end of the driven roller sleeve located outside the driven roller. Under the drive of the tension adjustment actuator, the push-pull arm reciprocates to drive the driven roller sleeve to move along the running direction of the transmission belt, thereby driving the driven roller to reciprocate along the running direction of the transmission belt, thereby adjusting the distance between the driven roller and the main transmission roller so that it can make room for the length of the transmission belt required to be increased when the drag beam passes the roller. The push-pull arm supports the driven roller sleeve. The driven roller and the driven sprocket shaft constitute the driven transmission roller. The tension adjustment actuator drives the push-pull arm, thereby driving the driven roller. The tension adjustment actuators on both sides move synchronously. Since the driven roller fixing sleeve is supported and fixed by the corresponding push-pull arm, and the two ends of the driven roller are rotatably connected to the driven roller fixing sleeve through bearings, when the driven roller fixing sleeve moves back and forth, the driven roller can also move back and forth. In this structure, the driven roller serves as a supporting component when the transmission belt is wrapped around, and the driven sprocket shaft only plays the role of supporting the driven sprocket. The distance between the driven sprocket shaft and the main drive roller, that is, the distance between the driven sprocket shaft and the driving sprocket shaft is fixed and unchanged. Therefore, by driving the driven roller fixing sleeve to move back and forth, the distance between the driven roller and the main drive roller for supporting the transmission belt can be changed. Therefore, when the drag beam assembly passes the main drive roller and / or the driven roller, the distance between the driven roller and the main drive shaft is adjusted accordingly by the actuator to reduce the distance between the two, so that the transmission belt The belt will not be tightened due to the increase of the conveyor belt's winding radius when the drag beam passes the roller, so that the drag beam can smoothly pass the main drive roller and / or the driven roller. When the drag beam does not pass the drive roller, the actuator drives the driven roller to move with the main drive roller on its back to increase the distance between the two, so as to adapt to the length of the conveyor belt "excess" due to the reduction of the conveyor belt's winding diameter, so that the conveyor belt is tensioned and does not sag or sag excessively due to relaxation and meet the photovoltaic components below, so as to avoid the conveyor belt from meeting the photovoltaic components or other moving parts located in the lower layer during operation, such as the drag beams arranged opposite to each other in the upper and lower layers. It is best that the radius of the main drive roller is equal to the radius of the driven roller, and the active sprocket shaft is equal to the diameter of the driven sprocket shaft, so that the conveyor belt can move in the horizontal plane.Of course, the radius of the main drive roller and the radius of the driven roller may not be equal, and may be large or small. For example, when the diameter of the driven roller is large, since it is a driven wheel, its rotation speed will be slower than the rotation speed of the main drive roller, and vice versa. Similarly, the diameter of the driving sprocket shaft and the diameter of the driven sprocket shaft may not be equal. For example, the diameter of the driving sprocket shaft may be larger than the diameter of the driven sprocket shaft. Since the driven sprocket shaft is the driven shaft, the rotation speed of the driven sprocket shaft will be slightly slower, and vice versa.

[0014] The working process and principle of the present invention are as follows: Figure 5 As shown, when the drag beam assembly passes around the transmission roller, that is, when the position X2 where the vertical center line of the transmission roller intersects with the outer circumference of the transmission roller moves to the position X3 where the horizontal center line of the transmission roller intersects with the outer circumference of the transmission roller, the transmission belt is supported by the drag beam assembly. At this time, a part of the transmission belt is separated from the transmission roller and the upper surface of the workbench part, thereby increasing the radius of the transmission roller, and there is a distance a between the transmission roller. In the process of the drag beam moving in a circle from position X2 to position X3, a high point position will appear on this quarter of the circumference. The position of this high point will be different due to the different structural forms and sizes of the drag beam itself. At this time, the distance a between the transmission belt and the transmission roller reaches the maximum value. When moving downward from point X3 When a point X2 moves, this distance gradually decreases until it reaches point X2 and the conveyor belt is again in an angled state with the conveyor roller. In order to prevent the conveyor belt from being torn and the conveyor chain from being broken when the drag beam assembly drives the conveyor belt to move from point X2 to point X3 to the next vertical center line and the outer circumference of the transmission roller. The tension adjustment mechanism is activated to drive the push-pull arm to move the driven roller toward the main transmission roller, reducing the distance between the driven roller and the main transmission roller. The maximum moving distance of the push-pull arm is greater than or equal to the product of the distance between the conveyor belt and the driven roller when the drag beam passes the high point position to point X3, Lz=1 / 4×2πR=1 / 4×2π(R1-R0) and the number of drag beams passing through the transmission roller. The maximum moving distance of the driven roller fixed sleeve is calculated as follows: when the high-temperature conveyor belt driven by the high-temperature conveyor belt drag beam assembly 4 moves from position X2 to position X3 in a 1 / 4 circle, in order to ensure that the conveyor belt passes through the roller, the actuator drives the driven roller fixed sleeve to move within this distance so that the conveyor belt is not torn when it is at the high point. R1 can be calculated or measured as follows: R1 is the radius of the fixed intersection of the conveyor belt and the drag beam when the drag beam passes through the transmission roller and the horizontal center line of the transmission roller. In the present invention, the actuator drives the driven roller fixed sleeve to move toward or away from the transmission roller to adaptively increase or decrease the distance between the driven roller and the main transmission roller, thereby compensating for the change in the conveyor belt length requirement caused by the drag beam passing through the transmission roller.

[0015] In the present invention, the length of the transmission belt can be determined according to the theoretical design length of the transmission belt, and the length of the transmission chain can be determined according to the theoretical design length of the transmission chain. The theoretical design length of the transmission belt is the sum of the center line distance between the main drive roller and the driven roller and the radius of the driven roller and the main drive roller multiplied by a coefficient. Under normal circumstances, the coefficient is greater than or equal to 1 and less than or equal to 1.01. This coefficient is empirical data. Appropriate adjustments can be made according to the structure of the drag beam. The structure of the drag beam currently used is a pull rod plus mandrel type, and the mandrel is sleeved in a sleeve arranged at the end of the transmission belt.

[0016] The length of the conveyor belt can also be determined according to the length of the conveyor belt when it is tightly holding the conveyor roller. In this way, the conveyor belt can be prevented from sagging. Alternatively, the length of the conveyor belt when it is tightly holding the conveyor roller can be multiplied by a certain coefficient so that the sagging length of the conveyor belt is appropriate when the drag beam does not pass the roller, so as not to encounter the workpiece located in the lower layer during the transmission process. Under normal circumstances, the driven roller is coaxial with the driven chain shaft. When the drag beam passes the transmission roller, the driven roller is driven by the tension adjustment actuator to move toward the main transmission roller, thereby allowing the length of the conveyor belt to be increased when the drag beam passes the roller. The tension adjustment actuator can be activated according to the position information of the drag beam to drive the driven roller fixing sleeve to move. When the drag beam reaches the X2 point position, the tension adjustment actuator is activated to push the driven roller to move. At this time, a position sensor needs to be set to detect the position of the drag beam. The tension adjustment actuator can also be activated according to the change in the torque of the motor shaft of the chain drive drive device that drives the main drive roller. A torque sensor is set on the motor shaft. When the torque of the chain drive drive device shaft increases, the tension adjustment actuator is activated to reduce The distance between the driven roller and the main drive roller, when the torque of the chain drive drive shaft is detected to decrease, the tension adjustment actuator is activated to increase the distance between the driven roller and the main drive roller. The tension adjustment actuator adopts a servo drive mechanism, such as a servo motor, a servo hydraulic cylinder, a servo cylinder, a servo electric cylinder, etc. A torque sensor is set on the motor shaft, connected to the servo drive mechanism, and a conveyor belt tension control device is set. Generally, a PLC or MCU (single-chip microcomputer) is used. The input end of the conveyor belt tension control device is connected to the detection device, and the output end is connected to the tension adjustment actuator. When it is known that the drag beam reaches point X2 and point X3 and moves, the driven roller is driven to move toward the main drive roller. When it is known that the drag beam moves from point X3 to point X2, it moves with the main drive roller on its back. In order to make the mechanism coordinated and easy to control, two drag beam assemblies are usually used, and the length of the conveyor belts on both sides of the two drag beam assemblies is equal. Therefore, when the drag beam on one side passes the drive roller, the drag beam on the other side passes the drive roller in the opposite direction and synchronously. The position of the dragging beam can also be obtained by detecting the change of the linear velocity of the dragging beam, and the actuator adjusts the moving distance and direction of the driven roller fixing sleeve according to the change of the linear velocity of the dragging beam.The moving speed V0 of the transmission chain is a constant speed. The moving direction of the high temperature transmission belt drag beam assembly 4 is parallel to the moving direction of the transmission chain. Since the two are fixedly connected, the running speeds are equal, that is, V1=V0, where V1 is the moving speed of the high temperature transmission belt drag beam assembly (4); when the high temperature transmission belt drag beam assembly moves from position X2 to the horizontal radial position X3 of the transmission shaft, this movement is a 1 / 4 circular movement, and the moving speed of the transmission chain is kept at a constant speed V1. At this time, the moving speed V2 of the high temperature transmission belt drag beam assembly 4 is (R1 / R0)V1, where V2 is the speed of the high temperature transmission belt drag beam assembly 4, R0 is the radius of the transmission belt passing through the transmission roller, and R1 is the radius of the fixed intersection position of the transmission belt and the drag beam when the drag beam passes through the transmission roller. It can be seen that V2 becomes faster. Therefore, by detecting the change in the linear speed of the drag beam, the position of the drag beam can also be known, so that the actuator drives the driven roller fixed sleeve to move a corresponding distance. Constant tension can be achieved. The transmission chain preferably adopts a precision transmission roller chain, which can improve the transmission accuracy, improve the accuracy of the moving distance of the driven roller fixing sleeve, and improve the adjustment effect of the transmission belt. The speed and direction of the driven roller driven by the tension adjustment actuator can also be adjusted by the tension control device, so that it can run synchronously with the drag beam assembly around the transmission roller, so that the transmission belt reaches a constant tension. The transmission system of the present invention is provided with a transmission belt tension adjustment mechanism and a control device, so that it can be adjusted by measuring the change of its torque, thereby preventing the motor torque from increasing excessively, preventing the transmission chain from breaking or the transmission belt from tearing.

Claims

1. A photovoltaic module transmission system used in a photovoltaic module laminating machine, comprising a transmission belt, a transmission belt driving device and a transmission belt tension adjustment mechanism, wherein the transmission belt driving device comprises two parallel transmission chains, a chain transmission driving device, an active side chain transmission device and a driven side chain transmission device, wherein the active side chain transmission device comprises a main transmission roller, at both ends of the main transmission roller, a driving sprocket shaft is concentrically fixedly arranged, a driving sprocket is fixedly arranged on the driving sprocket shaft, and the main transmission roller is connected to the chain transmission driving device, characterized in that: The driven side chain transmission device includes a driven transmission roller and a driven sprocket. Driven sprockets are arranged on both sides of the driven transmission roller. The driven transmission roller is arranged in parallel with the main transmission roller. The two transmission chains are respectively connected to the driving sprocket and the driven sprocket on the corresponding side. The driven transmission roller is a driven sprocket shaft. The driven sprocket shaft is parallel to the driving sprocket shaft and the spacing is fixed. The driven sprocket is arranged on the driven sprocket shaft. The transmission belt tension adjustment mechanism includes a tension adjustment actuator, a driven roller, and a driven roller fixing sleeve. The driven roller fixing sleeve is arranged outside the driven sprocket shaft. The two ends of the driven roller are rotatably arranged outside the driven roller fixing sleeve. There is a certain distance between the driven roller fixing sleeve and the driven sprocket shaft in the running direction of the transmission belt. One end of the driven roller fixing sleeve One end is located on the inner side of the driven roller, and the other end is located on the outer side of the driven roller. There is no connection between the driven roller sleeve and the driven sprocket shaft. The output end of the tension adjustment actuator is fixedly connected to the end of the driven roller fixed sleeve located on the outer side of the driven roller through a push-pull arm. The driven roller and the driven roller fixed sleeve are both supported by the push-pull arm. Driven by the tension adjustment actuator, the push-pull arm reciprocates to drive the driven roller sleeve to reciprocate along the direction of the transmission belt, thereby driving the driven roller to reciprocate along the direction of the transmission belt, thereby adjusting the distance between the driven roller and the main drive roller so that the two are closer or farther away from each other. The distance between the driven roller and the main drive roller is greater than or equal to the length of the transmission belt that needs to be increased when the drag beam assembly wraps around the transmission roller.

2. The photovoltaic module transmission system used in the photovoltaic module laminating machine according to claim 1, characterized in that: The driven sprocket shaft is a through shaft or two short shafts with a common center line, and / or the roller fixing sleeve is a through-length sleeve or two short sleeves with a common center line; or the tension adjustment actuator is a servo drive mechanism, and the servo drive mechanism is a servo motor, a servo hydraulic cylinder, a servo cylinder, or a servo electric cylinder; or a tension adjustment actuator is respectively arranged on both sides of the length of the driven roller and is fixedly connected to the driven roller fixing sleeve on the corresponding side through a push-pull arm.

3. The photovoltaic module transmission system used in the photovoltaic module laminating machine according to claim 1, characterized in that: The outer diameters of the main driving roller and the driven roller are equal or unequal, and the outer diameters of the driven sprocket shaft and the driving sprocket shaft are equal or unequal.

4. A photovoltaic module transmission system for a photovoltaic module laminator according to claim 1 or 3, characterized in that: The length of the transmission belt is greater than or equal to the total length required when the transmission belt wraps around the drive rollers on both sides, that is, the sum of the center line distance of the drive rollers on both sides and the radius of the two drive rollers, and less than the total length of the transmission belt when the transmission belt wraps around the drive rollers on both sides and the transmission belt sags to the maximum limit length of the sag of the transmission belt; or the length of the transmission belt is the theoretical design length of the transmission belt, and the theoretical design length of the transmission belt is the sum of the center line distance between the main drive roller and the driven roller and the radius of the driven roller and the main drive roller multiplied by a coefficient, and the coefficient is greater than or equal to 1 and less than or equal to 1.

01.

5. The photovoltaic module transmission system used in the photovoltaic module laminating machine according to claim 1, characterized in that: It also includes a tension control system, which includes a towing beam assembly position detection device and a control device, the output end of the control device is connected to the tension adjustment actuator by electrical signals, and the input end of the control device is connected to the towing beam assembly position detection device by electrical signals. When the towing beam assembly position detection device detects that the towing beam assembly is running around the transmission roller, the control device controls the tension adjustment actuator to drive the driven roller to move and change the distance between the main transmission roller and the driven roller so that the conveyor belt can pass through the main transmission roller and / or the driven roller smoothly and the drooping length of the conveyor belt is less than the drooping length of the conveyor belt to the maximum limit of the drooping length of the conveyor belt.

6. The photovoltaic module transmission system used in the photovoltaic module laminating machine according to claim 5, characterized in that: When the drag beam assembly position detection device detects that the drag beam assembly moves from position X2 to position X3, the control device controls the tension adjustment actuator to drive the driven roller to move toward the main drive roller; when the drag beam assembly position detection device detects that the drag beam assembly moves from position X3 to position X2, the control device controls the tension adjustment actuator to drive the driven roller to move with the main drive roller on its back; or the tension control device is a PLC; or the transmission chain is a precision transmission roller chain.

7. The photovoltaic module transmission system used in the photovoltaic module laminating machine according to claim 6, characterized in that: When the drag beam assembly position detection device detects that the drag beam assembly moves from position X2 to position X3 and then to position X4, the control device controls the tension adjustment actuator to drive the driven roller to move synchronously toward or away from the main drive roller to keep the transmission belt at a constant tension.

8. The photovoltaic module transmission system used in the photovoltaic module laminating machine according to claim 6, characterized in that: The position detection device of the drag beam assembly is a position sensor, which is fixedly arranged at a position corresponding to the X2 and X3 point positions of the transmission roller; or the position sensor is a speed sensor, which is fixedly arranged at a position corresponding to the X2 and X3 point positions of the transmission roller, and determines whether the position of the drag beam assembly reaches the X2 and X3 points by sensing the speed change of the transmission belt; or the position sensor is a torque sensor, which is used to detect the torque change of the output shaft of the driving motor of the chain transmission drive device. When it is detected that the torque of the chain transmission drive device shaft is reduced, the tension adjustment actuator is actuated to increase the distance between the driven roller and the main transmission roller.

9. A photovoltaic module laminating machine, comprising a workbench and a photovoltaic module transmission system, characterized in that: The photovoltaic module transmission system adopts the structure described in one of claims 1-8, the main drive roller and the driven roller are respectively located at the front end and the rear end of the workbench, and the transmission belt is arranged around the main drive roller, the driven roller and the workbench, or the laminator is a multi-layer laminator, each laminator includes a laminating unit, and each laminating unit is arranged in an upper and lower layer, and each laminating unit includes a workbench and a photovoltaic module transmission system. The photovoltaic module transmission system adopts the structure described in one of claims 1-4, the main drive roller and the driven roller are respectively located at the front end and the rear end of the workbench, and the transmission belt is arranged around the main drive roller, the driven roller and the workbench, and the transmission belt of the upper laminating unit is the photovoltaic module covering belt of the lower laminating unit.

10. A photovoltaic module laminating machine as claimed in claim 9, characterized in that: The workbench is a heating plate or a cooling plate, or includes both a heating plate and a cooling plate, and the heating plate and the cooling plate are arranged front and back.

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