Flexible film photovoltaic roll-to-roll CSD spraying coating device
Technical Field
The invention belongs to the field of solar cell production, relates to a production and processing equipment device of a flexible thin film solar cell, and particularly relates to a flexible thin film photovoltaic roll-to-roll CSD spray coating device.
Background
The flexible solar cell is formed by forming a solar photovoltaic material coating layer on a flexible windable substrate. In order to improve the production efficiency, the flexible solar cell is generally produced continuously by using a continuous stainless steel substrate which is conveyed roll to roll. In the field of thin film photovoltaics, CSD (chemical solution deposition method for preparing thin films) is a widely used substrate coating process, and can realize efficient and large-scale mass production. The traditional CSD is used in a coating process of an ultrathin stainless steel substrate or a glass substrate, in the chemical water bath deposition coating process, the surface of the substrate is flat due to the fact that the substrate is pulled under the tension of a roller shaft, when a reaction solution is sprayed onto the surface of the substrate from a nozzle, the solution easily flows out of two sides of the substrate and cannot be accumulated on the surface of the substrate for reaction, and the deposition reaction time is about 5 minutes, so that the coating cannot be effectively guaranteed, particularly when the solution amount on the surface of the substrate is insufficient, local solution agglomeration and local solution loss are easily caused, and the uniformity and the film forming quality of the coating are easily damaged.
Disclosure of Invention
The invention aims to solve the problem that the solution is easy to run off from two sides on the surface of a stainless steel substrate coiled material conveyed flatly due to the gravity of the solution at the edge in the CSD spray coating process of the ultrathin flexible film photovoltaic roll-to-roll so as to cause the liquid level of the coating transverse solution to be inconsistent and cause the integral coating to be uneven.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a flexible film photovoltaic volume to volume CSD sprays coating device, is including putting spool, rolling axle and a plurality of conveying roller, puts spool output coating film coiled material to rolling axle rolling after each conveying roller in proper order, its characterized in that: set up the coating section after unreeling the axle, coating section front end top sets up coating solution and sprays the mouth, and coating section both sides set up a plurality of side that upwards lift the coating coiled material side and hold in the palm, hold in the palm the inboard at the side and be equipped with a plurality of pinch rollers of pressing the coating coiled material upper surface. One of the conveying rollers between the unwinding shaft and the winding shaft is a tensioning roller. The front of coating film coiled material is the coating film face, reverse side coiling contact conveying roller, coating film section coating film coiled material upper surface is the front, this device is in the coating film section, utilize the side to hold in the palm the both sides limit of coating film coiled material upwards and hold up, and utilize the pinch roller to hold down the coating film coiled material inboard in the side, keep the level in the middle of making the coating film coiled material form, the retaining structure of both sides perk, can keep coating film solution at the upper surface of coating film coiled material, avoid running off from both sides from coating film solution, through the receipts unwinding speed of control coating film coiled material, can guarantee the transit time of coating film section, it is long when guaranteeing the coating film, make the coating film on coating film coiled material surface even, ensure the coating film quality.
Preferably, conveying rollers are respectively arranged at the front end and the rear end of the film coating section, and the upper surfaces of the conveying rollers at the front end and the rear end of the film coating section are higher than the lower side edge of the pressing wheel. The coating coiled material forms a sinking groove type after entering the coating section, and the coating solution is prevented from running off from the front end and the rear end.
Preferably, the bottom of the film coating section is provided with a plurality of carrier rollers for supporting the bottom surface of the film coating coiled material, and a heating block is arranged between adjacent carrier rollers. The support roller ensures that the bottom surface of the coating coiled material is conveyed smoothly.
Preferably, the side supports and the pressing wheels are arranged in a one-to-one correspondence mode, the side supports are installed on the adjusting seat, the top end of the adjusting seat is provided with a swing arm, the pressing wheels are erected at one end of the swing arm, the other end of the swing arm is provided with a balancing weight, an elongated slot capable of being adjusted transversely relative to the adjusting seat is formed in the swing arm, and the top end of the adjusting seat is rotatably connected with the elongated slot of the swing arm through a swing pin shaft. The pinch roller passes through the swing arm and supports, and the setting of the swing arm other end is the balancing weight, and the fulcrum of swing arm is adjustable, through above-mentioned adjustable lever structure, can adjust the pressure of pinch roller, has both guaranteed that the pinch roller has sufficient pressure to flatten the coating film coiled material, avoids the too big coating film coiled material surface fish tail that causes of pressure again.
Preferably, the bottom of the adjusting seat is provided with a sliding block which can slide and adjust along the conveying direction of the coating section. The adjusting seat can be adjusted from front to back, and after the position of the swing arm of the pressing wheel is adjusted, the position of the pressing wheel and the position of the carrier roller are ensured to correspond to each other through adjusting the position of the adjusting seat, so that the surface of the coated coiled material is ensured to be smooth.
Preferably, an extension shaft which is inwardly protruded is arranged between the pressing wheel and the end part of the swing arm.
Preferably, the side support is a truncated cone which can rotate around the axis, and the conical surface of the side support is a bearing surface for supporting the film-coated coil. The side support and the coating coiled material can also be rolling support instead of sliding support, so that the damage to the coating coiled material is reduced.
Preferably, the coating sections are horizontally arranged.
Preferably, the film coating surface of the film coating coiled material is the front surface, a film coating section, a washing section and a drying section are sequentially arranged between the unwinding shaft and the winding shaft, the front surface of the film coating coiled material in the film coating section is conveyed upwards in the forward direction, the front surface of the film coating coiled material at the front end of the washing section is vertically conveyed downwards, the front surface of the film coating coiled material at the rear end of the washing section is conveyed downwards in the reverse direction, and the front surface of the film coating coiled material in the drying section is conveyed downwards in the reverse direction.
Preferably, the front end of the washing section is provided with washing nozzles on the front surface of the film-coated coiled material, and the rear end of the washing section is provided with washing nozzles on the front surface and the back surface of the film-coated coiled material.
The invention ensures that the coating solution can be kept on the surface of the coating coiled material for deposition for a sufficient time by forming a holding structure with low middle and high two sides at the coating section through the side support and the pressing wheel, ensures the coating uniformity of the coating coiled material and ensures the coating quality.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Figure 2 is a schematic view of the support structure for the side pads and puck of the present invention.
Figure 3 is a schematic view of the picking support structure of the pinch roller and swing arm of the present invention.
FIG. 4 is a schematic cross-sectional view of a coated web of coated segments of the present invention.
In the figure: 1. unreeling shaft, 2, reeling shaft, 3, conveying roller, 4, tensioning roller, 5, coating section, 6, washing section, 7, washing section front end, 8, washing section rear end, 9, drying section, 10, coating solution spraying nozzle, 11, washing nozzle, 12, adjusting seat, 13, side support, 14, swing arm, 15, elongated slot, 16, swing pin shaft, 17, pinch roller, 18, balancing weight, 19, extension shaft, 20, carrier roller, 21, coating coiled material.
Detailed Description
The invention is further illustrated by the following specific examples in conjunction with the accompanying drawings.
Example (b): a flexible film photovoltaic roll-to-roll CSD spray coating device, as shown in figure 1. This device is including unreeling axle 1, rolling axle 2 and a plurality of conveying roller 3, unreels axle output coating film coiled material and to the rolling axle rolling behind each conveying roller in proper order, and wherein a conveying roller that is close to the rolling axle is tensioning roller 4. The coating surface of the coating coiled material 21 is the front surface, a coating section 5, a washing section 6 and a drying section 9 are sequentially arranged between the unreeling shaft 1 and the reeling shaft 2, the coating coiled material of the coating section 5 is conveyed upwards in the front direction, the coating section 5 is horizontally arranged, and a coating solution spraying nozzle 10 is arranged above the front end of the coating section 5. The front face of the coated coiled material at the front end 7 of the washing section is vertical and is conveyed downwards, the front face of the coated coiled material at the rear end 8 of the washing section is conveyed downwards in a reverse mode, the front face of the coated coiled material at the front end 7 of the washing section is provided with a washing nozzle 11, and the front face and the rear face of the coated coiled material at the rear end 8 of the washing section are provided with washing nozzles 11. And the drying section 9 conveys the coated coiled material in a reverse way with the front surface facing downwards.
As shown in fig. 1 and 4, 16 carrier rollers 20 are arranged on the bottom surface of the coating section, and a heating block is arranged between adjacent carrier rollers. Except two carrier rollers 20 which are closest to two ends, two ends of the other 14 carrier rollers are respectively and correspondingly provided with a side support 13 and a pinch roller 17, and 28 groups of side supports and pinch rollers are arranged. As shown in fig. 4, the side holder 13 is a truncated cone shape and can rotate around the central axis, the conical surface of the side holder 13 is used for lifting up two side edges of the film-coated coiled material 21, and the pressing wheel 17 is arranged at the inner side of the side holder and is used for flattening the inner side of the side edge of the film-coated coiled material 21. The press wheel 17 and idler 20 are preferably aligned one above the other. Conveying rollers 3 are respectively arranged at the front end and the rear end of the coating section 5, the upper surfaces of the conveying rollers 3 at the front end and the rear end of the coating section are higher than the lower side edge of the pinch roller 17, so that the front end, the rear end, the left side edge and the right side edge of a coating coiled material 21 of the coating section 5 are higher than the middle part, and a sinking groove capable of holding a coating solution is formed.
The side supports 13 and the pressing wheels 17 are correspondingly arranged in groups one by one, as shown in fig. 2 and 3, the side supports 13 are installed on an adjusting seat 12, a swing arm 14 is arranged at the top end of the adjusting seat 12, the pressing wheels 17 are erected at one end of the swing arm, a balancing weight 18 is arranged at the other end of the swing arm, a long groove 15 which can be transversely adjusted relative to the adjusting seat is formed in the swing arm 14, and the top end of the adjusting seat is rotatably connected with the long groove of the swing arm through a swing pin shaft 16. The swing arm can swing and can transversely adjust the supporting point, and the downward pressure of the pinch roller 17 is adjusted through the lever action. The bottom of the adjusting seat 12 is provided with a sliding block which can be adjusted in a sliding manner along the conveying direction of the film coating section, so that the position of the swing arm can be adjusted while the transverse position of the swing arm is changed, and the corresponding relation between the pressing wheel and the carrier roller is maintained. An extension shaft 19 which is inwardly protruded is arranged between the pressing wheel 17 and the end part of the swing arm 14 to ensure that the pressing wheel is inwardly protruded. The distance between the side support and the pinch roller is kept to be 2-5mm, so that the coated coiled material is prevented from being damaged by clamping.
The distance between the pinch roller 17 and the side edge of the coating coiled material 21 is kept between 10 and 20mm, the winding and unwinding speed is adjusted, the passing time of the coating coiled material in a coating section is ensured to be more than 5 minutes, the coating effect is ensured, and after coating is finished, the surface of the coating coiled material is cleaned, cooled and dried and then wound.