Glass fiber yarn tension adjusting device and photovoltaic frame pultrusion production line

Abstract

The utility model discloses a kind of glass fiber yarn tension adjusting device and photovoltaic frame pultrusion production line, glass fiber yarn tension adjusting device includes resistance roller assembly and clamping roller assembly;Resistance roller assembly includes resistance roller and resistance providing device, resistance providing device is configured as providing resistance to resistance roller;Clamping roller assembly includes clamping roller and driving device, driving device is configured as driving clamping roller movement towards the direction of close to or away from resistance roller.Glass fiber yarn is threaded through the gap between resistance roller and clamping roller, when glass fiber yarn moves at constant speed, there is no relative sliding between glass fiber yarn and resistance roller, clamping roller.The scheme can realize the effective tensioning of each yarn, improve the stress uniformity of yarn.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a fiberglass yarn tension adjustment device and a photovoltaic frame pultrusion production line. Background Technology

[0002] Composite photovoltaic frames are mainly composed of fiberglass yarn, felt, polymer resin, and coatings. They are an important component of photovoltaic modules, primarily used for installing, fixing, and sealing photovoltaic module cells. The main production method for composite photovoltaic frames is pultrusion. Raw materials such as fiberglass yarn and felt are gradually combed through yarn racks, dehumidifiers, felt racks, and preforming devices to the pultrusion die inlet. There, they are mixed with polymer resin (such as polyurethane) pumped by a glue injection machine. Under certain pressure and temperature conditions, the mixture is cured and molded. Powered by a traction machine, the molded frame product is continuously pulled out and then cut to a fixed length by a cutting machine based on measured length signals. The cut products then undergo inspection devices for appearance and straightness checks.

[0003] Existing fiberglass yarn tension adjustment devices apply tension to the yarn mainly by adjusting the angle of the yarn winding around the roller, without effectively clamping the yarn. This can easily lead to uneven stress on multiple yarns, resulting in different tensions applied to each yarn.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0005] In response to the problems mentioned in the background art, this utility model proposes a fiberglass yarn tension adjustment device and a photovoltaic frame pultrusion production line to achieve effective tensioning of each yarn and improve the uniformity of yarn stress.

[0006] To achieve the above-mentioned objectives, the present invention employs the following technical solution: In some embodiments of this application, a fiberglass yarn tension adjusting device is provided, comprising: A resistance roller assembly includes a resistance roller and a resistance providing device configured to provide resistance to the resistance roller; A clamping roller assembly includes a clamping roller and a drive device, the drive device being configured to drive the clamping roller to move toward or away from the resistance roller; The fiberglass yarn passes through the gap between the resistance roller and the clamping roller. When the fiberglass yarn moves at a constant speed, there is no relative sliding between the fiberglass yarn and the resistance roller and the clamping roller.

[0007] In some embodiments of this application, the resistance providing device is a magnetic powder brake.

[0008] In some embodiments of this application, the driving device is a cylinder.

[0009] In some embodiments of this application, the clamping rollers are two in number, and the resistance roller is positioned opposite the gap between the two clamping rollers.

[0010] In some embodiments of this application, the resistance roller assembly and the clamping roller assembly constitute a tension roller group, and the fiberglass yarn tension adjustment includes a plurality of the tension roller assemblies, the plurality of tension roller groups being arranged according to the cross-sectional shape of the frame to be pultruded.

[0011] In some embodiments of this application, a photovoltaic frame pultrusion production line is provided, including a fiberglass yarn frame, a felt frame, a fiberglass yarn tension adjustment device as described above, a pultrusion die, a traction machine, and a cutting machine arranged in sequence.

[0012] In some embodiments of this application, the fiberglass yarn tension adjustment device is integrated onto the felt frame.

[0013] In some embodiments of this application, the fiberglass yarn tension adjustment device is positioned as a separate device near the inlet of the pultrusion die.

[0014] Compared with the prior art, the advantages and positive effects of this utility model are: The fiberglass yarn tension adjustment device disclosed in this application is used to control the yarn tension during the production of photovoltaic frames. Under the action of a drive device, the clamping roller moves towards the resistance roller, tightly clamping the fiberglass yarn passing through the gap between them to form a tensioning roller group. This clamping structure can generate a uniform clamping force on each fiberglass yarn, avoiding the problems of uneven contact between the yarn and the roller body and weak local force in traditional roller angle adjustment methods. It ensures that multiple fiberglass yarns receive the same constraint force during movement, eliminating subsequent forming defects caused by tension differences in individual yarns from the source.

[0015] When the fiberglass yarn moves at a constant speed driven by the traction machine, there is no relative sliding between the fiberglass yarn and the tension roller group due to the clamping action of the clamping roller and the resistance roller. This ensures that the movement speed of each yarn is completely synchronized with the linear speed of the roller, further avoiding local tension fluctuations caused by sliding friction. This ensures that the fiberglass yarn maintains a uniform tension state before entering the pultrusion die, providing a stable substrate foundation for subsequent mixing and molding with felt and polymer resin. This effectively improves key quality indicators such as the structural density consistency and straightness of the photovoltaic frame, and reduces the defect rate of frame cracking and deformation caused by uneven yarn tension.

[0016] The magnetic powder brake is mechanically connected to the resistance roller, and its output torque can be precisely controlled by adjusting the input current. Simultaneously, the tension value of the fiberglass yarn can be calculated as the ratio of the magnetic powder brake's output torque to the resistance roller's radius. Based on this quantitative relationship, before starting the machine, the operator only needs to calculate the input current of the magnetic powder brake according to the tension value required by the production process, thus directly setting the target tension. This simplifies the tension adjustment process and shortens the start-up preparation time.

[0017] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a photovoltaic frame pultrusion production line according to some embodiments; Figure 2 This is a structural diagram of a felt rack and dehumidification integrated device according to some embodiments; Figure 3 This is a structural diagram of a fiberglass yarn tension adjustment device according to some embodiments; Figure 4 This is a structural diagram of a tensioning roller assembly according to some embodiments.

[0020] Figure label: 1. Fiberglass yarn frame; 2. Fiberglass yarn; 3. Felt frame and dehumidification integrated device; 31. Dehumidifier; 32. Felt frame; 4. Fiberglass yarn tension adjustment device; 5. Pultrusion die; 6. Glue injection machine; 7. Framed products; 8. Traction machine; 9. Cutting machine; 10. Testing device; 210. Resistance roller assembly; 211. Resistance roller; 212. Magnetic powder brake; 220. Clamping roller assembly; 221. Clamping roller; 222. Cylinder; 230. Tensioning roller assembly. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0027] In some embodiments of this application, a photovoltaic frame pultrusion production line is provided, as shown in the reference... Figure 1 The production line includes a fiberglass yarn frame 1, a pultrusion mold 5, a traction machine 8, a cutting machine 9, and a testing device 10 arranged in sequence. This production line involves the production of semi-finished frame products, but does not involve subsequent processes such as beveling, drilling, or spraying.

[0028] Specifically, the production line includes a fiberglass yarn rack 1. The function of the fiberglass yarn rack 1 is to hold bundles of fiberglass yarn, which are produced by an inward-retracting yarn output.

[0029] The production line also includes a felt rack 32, which is used to hold felt.

[0030] The production line also includes a dehumidifier 31, which is used to remove moisture from the yarn.

[0031] The production line also includes a fiberglass yarn tension adjustment device 4, which is used to adjust the tension of the fiberglass yarn 2.

[0032] The production line also includes a pultrusion die 5. The pultrusion die 5 consists of two parts: a preforming die and a hot mold. The preforming die further straightens the fiberglass yarn 2 and felt that are about to enter the die, while the hot mold constrains all the raw materials to the shape of the frame product 7 and cures them under certain temperature and injection pressure.

[0033] The production line also includes a glue injection machine 6, which pumps polymer resin raw materials to the glue injection port of the pultrusion die 5 via a glue injection pump.

[0034] The production line also includes a traction machine 8, which provides the power to pull the cured frame out of the mold.

[0035] The production line also includes a cutting machine 9, which performs fixed-length cutting of the frame product 7 according to the measured length.

[0036] The production line also includes a testing device 10, which performs quality inspections on indicators such as the straightness and appearance of the frame.

[0037] In some embodiments of this application, reference is made to Figure 2 The felt frame 32 is integrated with the dehumidifier 31 to form a felt frame and dehumidification integrated device 3. The felt frame 32 is provided at the top and bottom of the dehumidifier 31. Its main function is to transfer the yarn, remove moisture from the yarn, support the felt roll, and provide tension to the felt.

[0038] The production line of this application, by setting up a felt rack and dehumidification integrated device 3, directly reduces the space occupied by a single piece of equipment, eliminating the need to plan separate installation areas for the dehumidifier 31 and the felt rack 32, thus reducing the total area occupied by both within the constant temperature and humidity chamber. On the one hand, under the same site conditions, it can improve the layout flexibility of other equipment within the constant temperature and humidity chamber, and even reduce the overall construction scale of the constant temperature and humidity chamber, thereby reducing factory infrastructure and energy consumption costs; on the other hand, the integrated design reduces redundant intervals between equipment, making the overall layout of the production line more compact, facilitating inspection and maintenance by operators, and indirectly improving production efficiency.

[0039] Furthermore, this application fundamentally shortens the conveying distance of the dehumidified fiberglass yarn 2 from its dehumidification stage to its entry into the pultrusion mold 5 by integrating the felt frame 32 with the dehumidifier 31 and optimizing the production line layout. The dehumidified fiberglass yarn 2 can directly transition from the felt frame 32 within the integrated device to the subsequent preforming process without undergoing long-distance winding, reducing contact time with moisture in the air and effectively preventing secondary moisture absorption by the fiberglass yarn 2. The reduced moisture content of the fiberglass yarn 2 also reduces appearance defects such as bubbles and pinholes caused by moisture vaporization during its mixing and curing with the polymer resin, improving the appearance qualification rate of the composite photovoltaic frame.

[0040] In some embodiments of this application, the fiberglass yarn tension adjustment device 4 is positioned near the inlet of the pultrusion mold 5, allowing for real-time monitoring and adjustment of the tension of the fiberglass yarn 2 about to enter the mold. This avoids tension loss or fluctuations caused by factors such as twisting friction and equipment vibration during long-distance transport. On one hand, stable and precise yarn tension ensures that the fiberglass yarn 2 is evenly distributed during the pre-forming stage, preventing fiber breakage due to excessive local tension or fiber accumulation due to insufficient tension, thus ensuring the cross-sectional dimensional accuracy of the frame product 7 after molding. On the other hand, uniform tension distribution allows the fiberglass yarn 2 to be fully impregnated with the polymer resin and subjected to uniform force within the mold, reducing local structural looseness or stress concentration caused by uneven tension, improving the structural consistency of different batches of frame products 7, and reducing quality risks such as product deformation and cracking caused by tension deviations.

[0041] Existing fiberglass yarn tension adjustment devices apply tension to the yarn primarily by adjusting the angle of the yarn winding roller, without effectively clamping the yarn. This easily leads to uneven stress on multiple yarns, resulting in inconsistent tension applied to each yarn. Furthermore, the tension value applied to the yarn cannot be directly set by these devices; it requires feedback from tension sensors to obtain the adjusted yarn tension, followed by corrections based on the feedback value. This process is extremely cumbersome and demands a high level of operator skill.

[0042] To address the aforementioned technical problems, the structure of the fiberglass yarn tension adjusting device 4 is improved in some embodiments of this application. Specifically, referring to... Figure 3 and Figure 4 The fiberglass yarn tension adjusting device 4 includes a resistance roller assembly 210. The resistance roller assembly 210 includes a resistance roller 211 and a resistance providing device configured to provide resistance to the resistance roller 211. For example, the resistance providing device is a magnetic powder brake 212, or it could be another form such as a motor.

[0043] The fiberglass yarn tension adjusting device 4 also includes a clamping roller assembly 220. The clamping roller assembly 220 includes a clamping roller 221 and a drive device configured to drive the clamping roller 221 to move toward or away from the resistance roller 211. For example, the drive device is a cylinder 222, or it can be a motor or other mechanical structure.

[0044] The fiberglass yarn 2 passes through the gap between the resistance roller 211 and the clamping roller 221. When the fiberglass yarn 2 moves at a constant speed, there is no relative sliding between the fiberglass yarn 2 and the resistance roller 211 and the clamping roller 221.

[0045] The fiberglass yarn tension regulating device 4 is used to control the yarn tension during the production of photovoltaic frames. The magnetic powder brake 212 is mechanically connected to the resistance roller 211, and the magnetic powder brake 212 can achieve different torque outputs by changing the magnitude of the input current.

[0046] Before starting the photovoltaic frame production line, the yarn at the specified position is passed between the resistance roller 211 and the clamping roller 221. Simultaneously, the clamping roller 221 clamps the yarn under the action of the cylinder 222. The resistance roller 211 and the clamping roller 221 together form the tension roller group 230. When the yarn moves at a constant speed driven by the traction machine 8, there is no relative slippage between the yarn and the tension roller group 230. Its tension can be calculated by the ratio of the output torque of the magnetic powder brake 212 to the radius of the resistance roller 211, thus achieving precise control of the yarn tension by controlling the current of the magnetic powder brake 212.

[0047] In the fiberglass yarn tension adjustment device 4, the clamping roller 221 moves toward the resistance roller 211 under the action of the driving device (such as the cylinder 222), tightly clamping the fiberglass yarn 2 passing through the gap between the two to form the tension roller group 230. This clamping structure can form a uniform clamping force on each fiberglass yarn 2, avoiding the problems of uneven contact between the yarn and the roller body and weak local force in the traditional roller angle adjustment method, ensuring that multiple fiberglass yarns 2 can obtain the same constraint force during the movement, thus eliminating subsequent forming defects caused by the tension difference of a single yarn from the source.

[0048] When the fiberglass yarn 2 moves at a constant speed driven by the traction machine 8, due to the clamping action of the clamping roller 221 and the resistance roller 211, there is no relative sliding between the fiberglass yarn 2 and the tension roller group 230. This makes the movement speed of each yarn completely synchronized with the linear speed of the rollers, further avoiding local tension fluctuations caused by sliding friction. This ensures that the fiberglass yarn 2 maintains a uniform tension state before entering the pultrusion die 5, providing a stable substrate foundation for subsequent mixing and molding with felt and polymer resin. This effectively improves key quality indicators such as the structural density consistency and straightness of the photovoltaic frame, and reduces the defect rate of frame cracking and deformation caused by uneven yarn tension.

[0049] In this application, the magnetic powder brake 212 is mechanically connected to the resistance roller 211, and its output torque can be precisely controlled by adjusting the input current. Simultaneously, the tension value of the fiberglass yarn 2 can be calculated as the ratio of the output torque of the magnetic powder brake 212 to the radius of the resistance roller 211. Based on this quantitative relationship, before starting the machine, the operator only needs to calculate the input current of the magnetic powder brake 212 according to the tension value required by the production process, thus directly achieving the target tension setting, simplifying the tension adjustment process, and shortening the start-up preparation time.

[0050] The magnetic powder brake 212 has a continuously adjustable torque output characteristic. By finely adjusting the input current, the torque can be linearly changed, thereby achieving fine tension adjustment. The adjustment accuracy is much higher than the experience-based operation of traditional roller angle adjustment. It can meet the tension requirements of different specifications of glass fiber yarn 2 and different frame product models 7, and improve the process adaptability of the production line.

[0051] In some embodiments of this application, the clamping roller 221 has two parts, and the resistance roller 211 is positioned opposite the gap between the two clamping rollers 221.

[0052] The clamping roller assembly 220 includes two clamping rollers 221 of the same specification. The two clamping rollers 221 are symmetrically distributed in the horizontal direction, and the axes of the two clamping rollers 221 are parallel to each other. The outer peripheral surface of the resistance roller 211 is directly opposite the gap formed between the two clamping rollers 221, hereinafter referred to as the clamping roller gap. The width of the clamping roller gap can be finely adjusted by the distance between the two clamping rollers 221.

[0053] The two clamping rollers 221 maintain the clamping state of the yarn under the continuous pressure of the cylinder 222. Since the two clamping rollers 221 are symmetrically distributed and the clamping force is synchronized, the yarn is always in the center position of the gap between the clamping rollers during the movement, avoiding the yarn from shifting to one side and rubbing against the edge of the roller due to excessive clamping force on one side.

[0054] Driven by the magnetic powder brake 212, the resistance roller 211 outputs a set torque. Since there is no relative sliding between the yarn and the resistance roller 211 and the two clamping rollers 221, the three-point contact structure formed by the two clamping rollers 221 and the resistance roller 211 increases the contact length between the yarn and the roller body, further improving the stability of the yarn movement and avoiding local tension fluctuations caused by yarn vibration.

[0055] When the tension of the fiberglass yarn 2 needs to be adjusted during the production process, the input current of the magnetic powder brake 212 only needs to be adjusted by the controller, and the clamping force of the two clamping rollers 221 can remain unchanged, ensuring that the yarn maintains a stable clamping and conveying state during the tension adjustment process.

[0056] In some embodiments of this application, the resistance roller assembly 210 and the clamping roller assembly 220 constitute a tension roller group 230. The tension adjustment of the glass fiber yarn 2 includes multiple tension roller groups 230, which are arranged according to the cross-sectional shape of the frame to be pultruded. In other words, during the overall machine arrangement, the yarn is divided into several areas according to the cross-sectional shape of the frame, and tension is controlled in each area. In this way, it is ensured that the yarn does not undergo large-angle turning when entering the pultrusion die 5 after being tensioned, thus maximizing the tensioning effect.

[0057] In some embodiments of this application, the fiberglass yarn tension adjustment device 4 is integrated on the felt frame 32, which has a compact structure and helps to further reduce the floor space of the pultrusion production line.

[0058] In some embodiments of this application, the fiberglass yarn tension adjustment device 4 is set as a separate device near the inlet of the pultrusion die 5.

[0059] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0060] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A fiberglass yarn tension regulating device, characterized in that, Including: A resistance roller assembly includes a resistance roller and a resistance providing device configured to provide resistance to the resistance roller; A clamping roller assembly includes a clamping roller and a drive device, the drive device being configured to drive the clamping roller to move toward or away from the resistance roller; The fiberglass yarn passes through the gap between the resistance roller and the clamping roller. When the fiberglass yarn moves at a constant speed, there is no relative sliding between the fiberglass yarn and the resistance roller and the clamping roller.

2. The fiberglass yarn tension adjusting device according to claim 1, characterized in that, The resistance-providing device is a magnetic powder brake.

3. The fiberglass yarn tension adjusting device according to claim 1, characterized in that, The driving device is a cylinder.

4. The fiberglass yarn tension adjusting device according to claim 1, characterized in that, The clamping rollers are two in number, and the resistance roller is positioned opposite the gap between the two clamping rollers.

5. The fiberglass yarn tension adjusting device according to any one of claims 1 to 4, characterized in that, The resistance roller assembly and the clamping roller assembly constitute a tension roller group. The fiberglass yarn tension adjustment includes multiple tension roller assemblies, which are arranged according to the cross-sectional shape of the frame to be pultruded.

6. A photovoltaic frame pultrusion production line, characterized in that, It includes a fiberglass yarn frame, a felt frame, a fiberglass yarn tension adjustment device as described in any one of claims 1 to 5, a pultrusion die, a traction machine, and a cutting machine arranged in sequence.

7. The photovoltaic frame pultrusion production line according to claim 6, characterized in that, The fiberglass yarn tension adjustment device is integrated on the felt frame.

8. The photovoltaic frame pultrusion production line according to claim 6, characterized in that, The fiberglass yarn tension adjustment device is set as a separate device near the inlet of the pultrusion die.

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