Screen tensioning device

Abstract

The present invention discloses a wire mesh tensioning device, which comprises a pressure plate base, the pressure plate base having a first end and a second end arranged opposite to each other; and a plurality of wires, the two ends of each wire being respectively mounted at the first end and the second end; wherein a position adjustment part is provided at the first end and / or the second end of the pressure plate base, the position adjustment part is used to connect with the ends of the wires, and can be screwed in or out along the length direction of the wires to tighten or loosen the wires. The wire mesh tensioning device provided by the present invention has stable performance, is easy to adjust, and can effectively avoid the problem of fracture and deformation caused by repeated pressure on the surface of the wire mesh.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic component production equipment, and in particular to a wire mesh tensioning device. Background Art

[0002] The stringer is a device that uses a mechanical transmission mechanism to transport the cells and uses the high-temperature gas of the hot air pipe on the heated bottom plate to weld the cells. It is mainly used for the string welding of single crystal and polycrystalline cells in fully automatic crystalline silicon solar cell modules. The stringer usually includes an automatic feeding mechanism, a welding ribbon processing mechanism, a CCD detection and positioning system, a welding mechanism, a lower cell preheating unit, a belt transmission mechanism, and a flip collection mechanism. Among them, the welding mechanism is the main component of the stringer, which is used to string the solar cells through the welding ribbon. When stringing, the solar cells need to be fixed on the wire mesh disk at the bottom of the light box. The wire mesh disk is also called a pressure mesh or a pressure plate. The high temperature and pressure of the wire mesh wire in the wire mesh disk can make the cell and the welding ribbon fit together, thereby forming a welding point to achieve the purpose of fixed welding.

[0003] When manufacturing the wire mesh tensioning device, the tension is required to evenly tighten the wire mesh on the mesh frame at the bottom of the light box, because the tension of the wire mesh directly affects the quality of the string welding. If the wire mesh is not tightened or is unevenly tightened or loosened during use, the battery cell will be cracked due to excessive welding pressure, or the battery cell and the welding strip will be poorly contacted due to insufficient welding pressure. Most of the wire mesh tensioning devices currently used directly fix the two ends of the wire mesh on the wire mesh seat. The wire mesh seat is equipped with a spring, and the wire mesh line is tightened by the contraction of the spring. Therefore, the tightness of the wire mesh line will change with the deformation of the spring. Not only is it difficult for operators to ensure the consistency of the tightness of each wire mesh line during installation, but the wire mesh after installation often has abnormalities, such as breakage, looseness, and deviation, which causes the battery cell to be subjected to inconsistent pressure on the surface during welding with the welding strip, resulting in hidden cracks or cold welding of the battery cell. As a result, the machine must be stopped for the wire mesh structure. Maintenance is required, resulting in a serious decline in production capacity, an increase in defective batteries, and an increase in production costs. In addition, although the method of pre-tightening the wire mesh and then fixing it on the mesh frame is simple, the tension of the wire mesh is difficult to adjust, especially after it is relaxed, it cannot be adjusted at all, and the quality of string welding cannot be guaranteed. Moreover, since the wire mesh is directly fixed on the wire mesh holder, its length and height cannot be adjusted. When other types of solar cells need to be string welded, the wire mesh tensioning device will no longer be applicable. Therefore, this type of wire mesh tensioning device has poor compatibility and is difficult to maintain in the later stage. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects described in the prior art, thereby providing a wire mesh tensioning device and a photovoltaic string welding machine. The wire mesh tensioning device has stable performance and is easy to adjust, and can effectively avoid the problems of breakage and deformation caused by repeated pressure on the wire mesh surface; the photovoltaic string welding machine has a low failure rate.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A wire mesh tensioning device, comprising:

[0007] A pressure plate base having a first end and a second end disposed opposite to each other;

[0008] A plurality of silk threads, two ends of each of the silk threads being respectively mounted on the first end and the second end;

[0009] Wherein, a position adjustment portion is provided at the first end and / or the second end of the pressure plate base, and the position adjustment portion is used to connect with the end of the wire and can be screwed into or out of the pressure plate base along the length direction of the wire to tighten or loosen the wire.

[0010] In one embodiment, the wire mesh tensioning device further comprises a pressure regulating part having a tension adjusting screw which can be screwed into or out of the pressure plate base along a direction perpendicular to the length of the wire to apply a tensioning force to the wire.

[0011] In one embodiment, a free end of the tension adjusting screw is located above the wire, and the tension adjusting screw applies a tensioning pressure to the wire through a rotational motion.

[0012] In one embodiment, a through hole is opened on the side wall of the tension adjustment screw, the wire is passed through the through hole, and is tightened as the tension adjustment screw rotates.

[0013] In one embodiment, the wire is mounted above the platen base, wherein the position adjustment unit comprises:

[0014] A screw rod is arranged along the length direction of the wire and is threadedly connected to the pressing plate base;

[0015] The pre-tightening block is arranged at an angle with the screw rod to provide a thread connection site.

[0016] In one embodiment, the pressure regulating part also includes a tension adjusting hole opened on the pre-tightening block, the tension adjusting hole has an internal thread, and a through hole connected to the tension adjusting hole is opened on the side wall of the tension adjusting hole, and the end of the wire passes through the through hole and is fixed to the outside of the pre-tightening block; the tension adjusting screw is threadedly connected to the tension adjusting hole, and the force on the wire is adjusted by rotational motion.

[0017] In one embodiment, two ends of the wire are respectively passed through the first end and the second end of the pressing plate base, wherein the position adjustment part includes:

[0018] A mounting groove is provided at the first end and / or the second end of the pressing plate base and is arranged perpendicular to the length direction of the wire. The side wall of the mounting groove is provided with an internal thread, and the bottom wall is provided with a wire passing hole;

[0019] The screw rod is arranged along the length direction of the wire and connected to the mounting groove through the internal thread to provide a wire connection site and to tighten or loosen the wire through rotational motion.

[0020] In one embodiment, the pressure regulating part also includes a tension adjusting groove, the bottom wall of the tension adjusting groove is provided with a threaded hole, the threaded hole is arranged perpendicular to the wire passing hole and is connected with the threaded hole; the tension adjusting screw is threadedly connected to the threaded hole, and its force on the wire passing through the wire passing hole is controlled by rotational motion.

[0021] In one embodiment, the pressure plate base is an integrated plate-shaped structure, and a battery cell mounting groove is provided in the middle of the pressure plate base.

[0022] In one embodiment, the pressure plate base is a split structure, including a first base and a second base, and the first base and the second base are arranged in a mirror-symmetrical manner.

[0023] In one embodiment, the wire mesh is double-root drawn wire.

[0024] A photovoltaic string welding machine is provided with the wire mesh tensioning device.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The wire mesh tensioning device provided by the present invention is different from the prior art in that at least one end of each wire is arranged on the pressure plate base through a position adjustment part, and the position adjustment part can rotate along the length direction of the wire, thereby screwing in or out of the pressure plate base, driving the wire to be tensioned or loosened, so that the wire tension is evenly stretched on the pressure plate base, avoiding hidden cracks or cold welding of the battery cell caused by loose wire or uneven tension; one end of the wire can be directly fixed on the first end (second end) of the pressure plate base, and the other end is fixed on the position adjustment part arranged at the second end (first end) of the pressure plate base. Since the position adjustment part adjusts the tension of the wire through rotational movement, there will be no deformation problem, so that the performance of the wire mesh tensioning device is stable and easy to adjust, which can effectively avoid the problem of breakage and deformation caused by repeated pressure on the wire mesh surface; the failure rate of the photovoltaic string welding machine using the wire mesh tensioning device is also low.

[0027] In addition, in the present invention, the rotation of the wire with the position adjustment part is usually used to roughly adjust the tension of the wire mesh to make the tension of each wire uniform. For example, the position adjustment part is screwed in or out of the length of the pressure plate base to adjust the tension of the wire between the first end and the second end of the pressure plate base. This is a pre-adjustment process. After estimating the roughly fixed positions of the two ends of the wire, the tension can be increased by further rotating the position adjustment part. The present application can also further set a pressure adjustment part on the wire mesh tensioning device as a fine adjustment device after rough adjustment to solve the problem of high difficulty and high error in adjusting the tension using the position adjustment part. It mainly includes a pressure adjustment part. The tension adjustment screw of the pressure adjustment part can rotate in a direction perpendicular to the length of the wire, so as to adjust the force used to tension the wire. That is, the pressure regulating part and the position regulating part have different movement directions and are perpendicular to each other. They can adjust the tension of the wire in different directions. It can also be seen from the feeding direction of the position regulating part and the pressure regulating part that the position regulating part tightens or loosens the wire by adjusting the length of the wire, and the pressure regulating part can further exert force on the wire to achieve fine-tuning while ensuring the general arrangement position and tension of the wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic structural diagram of a wire mesh tensioning device in one embodiment of the present invention;

[0030] Figure 2 for Figure 1 Side view of

[0031] Figure 3 for Figure 1 A top view of

[0032] Figure 4 It is a structural schematic diagram of a wire mesh tensioning device in another embodiment of the present invention;

[0033] Figure 5 for Figure 4 A top view of

[0034] Figure 6 for Figure 4 Side view of.

[0035] Description of reference numerals:

[0036] 100, pressure plate base; 110, position adjustment part; 111, screw; 112, pre-tightening block; 113, mounting groove; 114, tension adjustment hole; 120, pressure adjustment part; 121, tension adjustment screw; 122, tension adjustment groove; 130, wire drawing fixing end plate; 140, battery cell mounting groove; 150, first base; 160, second base; 200, wire. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] Example 1

[0042] See also Figure 1-3 The present invention provides a wire mesh tensioning device, comprising a plurality of wires 200 and a pressure plate base 100 for fixing the wires 200, the pressure plate base 100 having a first end and a second end arranged opposite to each other; the two ends of each wire 200 are respectively mounted at the first end and the second end; wherein a position adjustment portion 110 is provided at the first end and / or the second end of the pressure plate base 100, the position adjustment portion 110 is used to be connected to the end of the wire 200, and can rotate along the length direction of the wire 200 to tension or loosen the wire 200.

[0043] The wire mesh tensioning device provided by the present invention is different from the prior art in that at least one end of each wire is arranged on the pressure plate base 100 through a position adjustment part 110, and the position adjustment part 110 can rotate along the length direction of the wire 200, so that the wire 200 can be tensioned or loosened with the rotation of the position adjustment part 110, so that the tension can be evenly stretched on the pressure plate base 100, avoiding hidden cracks or cold soldering of the battery cell caused by relaxation of the wire 200 or uneven tension; one end of the wire 200 can be directly fixed on the first end (second end) of the pressure plate base 100, and the other end is fixed on the position adjustment part 110 arranged at the second end (first end) of the pressure plate base 100. Since the position adjustment part 110 adjusts the tension of the wire 200 by rotation, there will be no deformation problem, so that the performance of the wire mesh tensioning device is stable and easy to adjust, which can effectively avoid the problem of breakage and deformation caused by repeated pressure on the surface of the wire 200.

[0044] Of course, considering that there are problems of high operating difficulty and large errors if the final tension of the wire 200 is controlled only by the position adjustment part 110 in the length direction, the rotation of the wire 200 with the position adjustment part 110 is usually used to coarsely adjust the tension of the wire 200 to make the tension of each wire 200 uniform. For example, the tension of the wire 200 located between the first end and the second end of the pressure plate base 100 is adjusted by rotating the position adjustment part 110 in or out of the length of the pressure plate base 100. This is a pre-adjustment process. After estimating the approximate fixed positions of the two ends of the wire 200, the tension can be increased by further rotating the position adjustment part 110. The present application can further set a pressure regulating part 120 on the wire mesh tensioning device as a fine-tuning device after rough adjustment to solve the problem of high difficulty in operation and high error in adjusting the tension by using the position regulating part 110. The pressure regulating part 120 mainly includes a pressure regulating part 120, and a tension adjusting screw 121 of the pressure regulating part 120 can rotate along a direction perpendicular to the length of the wire, so as to apply a tensioning force to the wire 200. That is, the pressure regulating part 120 and the position regulating part 110 have different movement directions, and the two are perpendicular to each other. The two can adjust the tension of the wire 200 in different directions. It can also be seen from the feeding direction of the position regulating part 110 and the pressure regulating part 120 that the position regulating part 110 tightens or loosens the wire 200 by adjusting the length of the wire 200, and the pressure regulating part 120 can further apply a force to the wire 200 under the condition of ensuring the general arrangement position and tension of the wire 200 to achieve the effect of fine adjustment.

[0045] The applicant will now elaborate on the specific structures of the position regulating part 110 and the pressure regulating part 120. It should be noted that the wire 200 in the present application can be fixed on the platen base 100 in a framing manner or in a manner of being respectively passed through at both ends. The two installation forms correspond to position regulating parts 110 and pressure regulating parts 120 of different structures. However, no matter which structure of the position regulating part 110 and the pressure regulating part 120, they have in common that the position regulating part 110 has a length along the wire 200. The screw 111 is arranged in the direction of degrees and is threadedly connected to the pressure plate base 100; the pressure regulating part 120 has a tension adjusting screw 121 that can rotate in a direction perpendicular to the length of the wire 200, and the free end of the tension adjusting screw 121 can be located above the wire 200, and the wire 200 is subjected to tensioning pressure through the rotational movement. A through hole can also be opened on the side wall of the tension adjusting screw 121, and the end of the wire 200 is passed through the through hole and fixed at the first end or the second end, so that the wire 200 is tightened with the rotation of the tension adjusting screw 121. The difference lies in the way of fixing the wire 200 to the position regulating part 110 and the mounting part that cooperates with the pressure regulating part 120 to rotate.

[0046] First, the wire 200 is mounted on the top of the platen base 100:

[0047] See also Figure 1-3 The position adjustment part 110 in this form includes: a screw rod 111 threadedly connected to the end of the pressure plate base 100 along the length direction of the wire 200, the screw rod 111 can be selectively set at the first end or the second end, or can be set at the first end and the second end at the same time in a mirror-symmetrical manner, and also includes a pre-tightening block 112, the pre-tightening block 112 is set at an angle to the screw rod 111, that is, the pre-tightening block 112 has a certain height, which can provide a connection point for mounting the wire 200. In this embodiment, the pre-tightening block 112 is vertically arranged above the screw rod.

[0048] When only one end of the pressure plate base 100 is provided with a position adjustment portion 110, for example, the first end, then one end of the wire 200 is installed on the second end of the pressure plate base 100 by direct fixing, for example, a wire drawing fixing end plate 130 is provided at the second end, and the other end of the wire 200 is connected to the first end of the pressure plate base 100 through the position adjustment portion 110. At this time, the pressure plate base 100 can be an integrated plate-like structure, and a battery cell mounting groove 140 is opened in the middle of the pressure plate base 100.

[0049] In this embodiment, the pressure regulating part 120 includes a tension regulating hole 114 opened on the pre-tightening block 112, the tension regulating hole 114 has an internal thread, and a through hole connected to the tension regulating hole 114 is opened on the side wall, and the end of the wire 200 passes through the through hole and is fixed to the outside of the pre-tightening block 112; the tension adjusting screw 121 is threadedly connected to the tension adjusting hole 114, and the force on the wire 200 is adjusted by rotational movement.

[0050] Secondly, the two ends of the wire 200 are respectively fixed to the first end and the second end through the main body of the pressure plate base 100:

[0051] See also Figure 2-4 The position adjustment part 110 in this form includes: a mounting groove 113 opened at the first end and / or the second end of the pressure plate base 100, the mounting groove 113 is arranged perpendicular to the length direction of the wire 200, the side wall of the mounting groove 113 is provided with an internal thread, and the bottom wall is provided with a wire hole, that is, the opening direction of the wire hole is parallel to the length direction of the wire 200; at this time, the screw rod 111 is connected to the mounting groove 113 through the internal thread along the length direction of the wire 200, and the end of the screw rod 111 is directly connected to the wire 200, and the wire 200 is tensioned or loosened by rotation.

[0052] In the present embodiment, the pressure plate base 100 can be an integrated plate-like structure with a battery cell mounting groove 140. If it is such a structure, the two ends of the wire 200 extend from the battery cell mounting groove 140 to the first end and the second end in the pressure plate base 100 respectively, and are fixed directly or through the position adjustment part 110; it can also be a split structure, specifically including a first base 150 and a second base 160 that are symmetrically arranged, the first base 150 and the second base 160 can move relatively, the first base 150 corresponds to the first end, and the second base 160 corresponds to the second end. Taking the position between the first base 150 and the second base 160 as the inner position, the main body of the wire 200 is located between the first base 150 and the second base 160, and the mounting groove 113 is provided on the outer side wall of the first base 150 and / or the second base 160, and the bottom wall of the mounting groove 113 is provided with a wire hole for installing the wire 200;

[0053] Among them, the pressure adjusting part 120 of this embodiment mainly includes a tension adjusting groove 122 and a tension adjusting screw 121. The plane where the bottom wall of the tension adjusting groove 122 is located is perpendicular to the plane where the bottom wall of the mounting groove 113 is located. A threaded hole is opened on the bottom wall of the tension adjusting groove 122, and the threaded hole is vertically connected to the wire passing hole. The tension adjusting screw 121 is threadedly connected to the tension adjusting groove 122 through the threaded hole, and it rotates in the threaded hole to adjust the force on the wire 200 passing through the wire passing hole.

[0054] When in use, the screw 111 is rotated, and the screw 111 is screwed in or out along the length direction of the wire 200, so that the length of the wire 200 between the two pressure plate bases 100 (the first base 150 and the second base 160 are relatively fixedly arranged on the production line) is loosened or tightened. When tightening is required, it is only necessary to manually adjust the screw 111 to tighten the wire 200. In addition, the present application can also be applied to cells of different sizes. Specifically, when in use, the first base 150 and the second base 160 are fixed at different relative positions on the production line to adapt to cells of different widths, or the screw 111 is moved arbitrarily along the length direction of the mounting groove 113 and tightened to adapt to cells of different widths. Therefore, it is not only compatible with solar panels of different lengths, but also compatible with solar panels of different widths. It has stronger compatibility and is easy to adjust. After determining the approximate fixed position of the wire and pre-tightening the wire 200, the wire can be tightened by rotating the tension adjustment screw 121 so that its tension is evenly stretched between the first base 150 and the second base 160. The tension of the wire 200 can be changed by adjusting the tension adjustment screw 121 in the tension adjustment groove 122 to screw in and out, thereby reducing the phenomenon of hidden cracks or cold solder joints occurring during string soldering of the battery cells.

[0055] In the above embodiment, the wire 200 is preferably made of double-drawn wires, and the material of the drawn wire is 65Mn, which can avoid the problem of fracture and deformation caused by repeated pressure on the drawing surface, ensuring the stability and reliability of the stringer. The pressure plate base 100 is preferably made of SUS304 stainless steel plate.

[0056] Example 2

[0057] This embodiment provides a photovoltaic string welding machine, in which the wire mesh tensioning device of the above embodiment is provided. The wire mesh tensioning device is easy to adjust and has strong compatibility, and can be applied to the string welding of different types of solar cells, effectively avoiding the problem of breakage and deformation caused by repeated pressure on the surface of the wire 200; the photovoltaic string welding machine provided with the wire mesh tensioning device has stable performance and high yield.

[0058] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A wire mesh tensioning device, characterized in that: include: A pressure plate base having a first end and a second end disposed opposite to each other; A plurality of silk threads, two ends of each of the silk threads being respectively mounted on the first end and the second end; Wherein, a position adjustment portion is provided at the first end and / or the second end of the pressing plate base, and the position adjustment portion is used to be connected to the end of the wire and can be screwed into or out of the pressing plate base along the length direction of the wire to tighten or loosen the wire; The wire mesh tensioning device further comprises a pressure regulating part, wherein the pressure regulating part comprises a tension regulating screw which can be screwed into or out of the pressing plate base in a direction perpendicular to the length of the wire, so as to apply a tensioning force to the wire; The free end of the tension adjustment screw is located above the wire, and the tension adjustment screw applies a tensioning pressure to the wire through a rotational motion; A through hole is provided on the side wall of the tension adjusting screw, the silk thread is passed through the through hole and is tightened as the tension adjusting screw rotates.

2. The wire mesh tensioning device according to claim 1, characterized in that: The wire is mounted above the platen base, wherein the position adjustment unit comprises: A screw rod is arranged along the length direction of the wire and is threadedly connected to the pressing plate base; The pre-tightening block is arranged at an angle with the screw rod to provide a thread connection site.

3. The wire mesh tensioning device according to claim 2, characterized in that: The pressure regulating part also includes a tension regulating hole opened on the pre-tightening block, the tension regulating hole has an internal thread, and a through hole connected to the tension regulating hole is opened on the side wall of the tension regulating hole, and the end of the wire passes through the through hole and is fixed to the outside of the pre-tightening block; the tension adjusting screw is threadedly connected to the tension adjusting hole, and the force acting on the wire is adjusted by rotational movement.

4. The wire mesh tensioning device according to claim 1, characterized in that: The two ends of the wire are respectively passed through the first end and the second end of the pressing plate base, wherein the position adjustment part includes: A mounting groove is provided at the first end and / or the second end of the pressing plate base and is arranged perpendicular to the length direction of the wire. The side wall of the mounting groove is provided with an internal thread, and the bottom wall is provided with a wire passing hole; The screw rod is arranged along the length direction of the wire and connected to the mounting groove through the internal thread to provide a wire connection site and to tighten or loosen the wire through rotational motion.

5. The wire mesh tensioning device according to claim 4, characterized in that: The pressure regulating part also includes a tension regulating groove, a bottom wall of which is provided with a threaded hole, and the threaded hole is arranged perpendicular to the wire passing hole and is connected with the threaded hole; the tension adjusting screw is threadedly connected to the threaded hole, and its force on the wire passing through the wire passing hole is controlled by rotational motion.

6. The wire mesh tensioning device according to claim 3 or 5, characterized in that: The pressure plate base is an integrated plate-shaped structure, and a battery cell installation groove is provided in the middle of the pressure plate base.

7. The wire mesh tensioning device according to claim 3 or 5, characterized in that: The pressure plate base is a split structure, including a first base and a second base, and the first base and the second base are arranged in mirror symmetry.

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