Photovoltaic interconnection copper strip continuous cold extrusion combined die

Abstract

The utility model discloses a photovoltaic interconnection copper strip continuous cold extrusion combined die which comprises a flattening pinch roller die, a material distribution pinch roller die and a shaping pinch roller die which are arranged above a copper bar, and a flattening supporting pinch roller die, a material distribution supporting pinch roller die and a shaping supporting pinch roller die which are arranged below the copper bar, the flattening pressing wheel die corresponds to the flattening supporting wheel die in position, the distributing pressing wheel die corresponds to the distributing supporting wheel die in position, and the shaping pressing wheel die corresponds to the shaping supporting wheel die in position. By arranging the flattening pressing wheel die, the flattening supporting wheel die, the material distributing pressing wheel die, the material distributing supporting wheel die, the shaping pressing wheel die and the shaping supporting wheel die, the copper bar is gradually extruded three times in the vertical diameter direction of the copper bar to reduce the thickness step by step, so that crack flaws and internal stress can be eliminated, and the production efficiency is improved. And the extrusion size is proper, the copper strip quality is improved, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to copper strip manufacturing cold extrusion die technical field, concretely is a kind of photovoltaic interconnection copper strip continuous cold extrusion combined die. BACKGROUND

[0002] There are two main forms of photovoltaic and photothermal for the utilization of solar energy, and photothermal is a way of directly using the heat of solar energy by concentrating or heat-absorbing materials. The common one is solar water heater. The application of photovoltaic is mainly power generation. When sunlight shines on the silicon material of the cell sheet, it triggers the transition of electrons to form an electric current, and then gradually collects the electric current to generate electricity. With the development of new energy and the increasing demand, the scale of photovoltaic power generation is also getting larger and larger. The development and expansion of the photovoltaic field cannot be separated from the use of photovoltaic interconnection copper strip.

[0003] The photovoltaic interconnection copper strip is usually made of copper wire and copper bar as raw materials and is formed by extrusion. The cross sections of the copper bar and the copper wire are circular, and the diameters are different, but the diameters of the copper bar and the copper wire are large and small, and the specifications are more. Since they are essentially the same, they are collectively referred to as copper strips in this paper. Among them, continuous cold extrusion is an important way of photovoltaic interconnection copper strip production. In the prior art, only one set of cold extrusion wheel die and cold extrusion support wheel die is used to continuously cold extrude the copper strip. Since the cross sections of the copper bar and the copper wire are circular, when they are continuously cold extruded into flat copper strips by one set of cold extrusion wheel die and cold extrusion support wheel die, the deformation speed is too fast, and it is easy to cause size error or crack defect that is not removed by extrusion due to deformation not in place, which affects the quality of the copper strip. In the field of photovoltaic interconnection, the current is large, the frequency is high, and the service life is affected, so there is room for improvement. UTILITY MODEL CONTENTS

[0004] In view of the deficiencies in the prior art, the utility model provides a kind of photovoltaic interconnection copper strip continuous cold extrusion combined die, to solve the problem that only one set of cold extrusion wheel die and cold extrusion support wheel die is used to continuously cold extrude the copper strip in the prior art, the deformation speed is too fast, and it is easy to cause size error or crack defect that is not removed by extrusion due to deformation not in place.

[0005] To solve the above technical problems, the utility model provides the following technical scheme:

[0006] A kind of photovoltaic interconnection copper strip continuous cold extrusion combined die, including the flattening pressure wheel die, distribution pressure wheel die and shaping pressure wheel die being arranged above copper bar, and the flattening support wheel die, distribution support wheel die and shaping support wheel die being arranged below copper bar, the flattening pressure wheel die and flattening support wheel die position correspond, the distribution pressure wheel die and distribution support wheel die position correspond, the shaping pressure wheel die and shaping support wheel die position correspond;

[0007] A circle of extrusion protrusions one is arranged on the circumference of the flattening pressure wheel mold, a circle of extrusion grooves one which is engaged with the extrusion protrusions one is arranged on the circumference of the flattening support wheel mold, and a circle of upper and lower displacement grooves one corresponding to the positions of the copper bars are respectively arranged on the circumference of the extrusion protrusions one and the inner wall of the circumference of the extrusion grooves one;

[0008] A circle of extrusion protrusions two is arranged on the circumference of the distribution pressure wheel mold, a circle of extrusion grooves two which is engaged with the extrusion protrusions two is arranged on the circumference of the distribution support wheel mold, a circle of upper and lower displacement grooves two corresponding to the positions of the copper bars are respectively arranged on the circumference of the extrusion protrusions two and the inner wall of the circumference of the extrusion grooves two, and a circle of upper and lower distribution protrusions are respectively arranged on the inner wall of the circumference of the upper and lower displacement grooves two;

[0009] A circle of shaping protrusions is arranged on the circumference of the shaping pressure wheel mold, and a circle of shaping grooves which is engaged with the shaping protrusions is arranged on the circumference of the shaping support wheel mold.

[0010] Preferably, the widths of the extrusion protrusions one, the extrusion grooves one, the extrusion protrusions two, the extrusion grooves two, the shaping protrusions and the shaping grooves are the same.

[0011] Preferably, the flattening pressure wheel mold, the distribution pressure wheel mold and the shaping pressure wheel mold are located at the same height, the flattening support wheel mold, the distribution support wheel mold and the shaping support wheel mold are located at the same height, the diameters corresponding to the circumferences of the extrusion protrusions one, the extrusion protrusions two and the shaping protrusions are the same, the depth of the extrusion grooves one is not less than the depth of the extrusion grooves two, and the depth of the extrusion grooves two is not less than the depth of the shaping grooves.

[0012] Preferably, the upper and lower displacement grooves one are circular grooves with the same cross-section inner diameter, the upper and lower displacement grooves two are circular grooves with the same cross-section inner diameter, the cross-section inner diameter of the circular grooves corresponding to the upper and lower displacement grooves one is greater than the diameter of the copper bar, and the cross-section inner diameter of the circular grooves corresponding to the upper and lower displacement grooves two is greater than the cross-section inner diameter of the circular grooves corresponding to the upper and lower displacement grooves one.

[0013] Preferably, the upper and lower distribution protrusions are respectively located at the central positions of the upper and lower displacement grooves two.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] This invention employs three sets of dies: a flattened pressure roller die and a flattened support roller die, a material distribution pressure roller die and a material distribution support roller die, and a shaping pressure roller die and a shaping support roller die. This allows for three stages of progressively reducing the thickness of the copper rod in the vertical diameter direction. During the second cold extrusion stage using the material distribution pressure roller die and the material distribution support roller die, the upper and lower material distribution convex ridges laterally compress the copper rod to both sides. This gradual compression in both the vertical and horizontal diameter directions helps eliminate cracks and defects, relieves internal stress, ensures accurate extrusion dimensions, improves the quality of the copper strip, and extends its service life. This invention solves the problems of excessively fast deformation speed, incomplete deformation leading to dimensional errors, and unremoved cracks and defects that occur in existing technologies that use only one set of cold extrusion dies and support roller dies for continuous cold extrusion of copper strip. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a right view of the flattened pressure roller mold and the flattened support roller mold of this utility model;

[0018] Figure 3 This is a right view of the material distribution pressure roller mold and the material distribution support roller mold of this utility model;

[0019] Figure 4 This is a right view of the shaping pressure roller mold and the shaping support roller mold of this utility model;

[0020] Figure 5 This is a diagram showing the extrusion stage of the copper rod according to this utility model.

[0021] In the diagram: 1. Copper rod; 101. Primary billet; 102. Secondary billet; 103. Copper strip; 2. Flattening pressure roller die; 201. Extrusion protrusion one; 202. Upper relief groove one; 3. Material distribution pressure roller die; 301. Extrusion protrusion two; 302. Upper relief groove two; 303. Upper material distribution protrusion; 4. Shaping pressure roller die; 401. Shaping protrusion; 5. Flattening support roller die; 501. Extrusion groove one; 502. Lower relief groove one; 6. Material distribution support roller die; 601. Extrusion groove two; 602. Lower relief groove two; 603. Lower material distribution protrusion; 7. Shaping support roller die; 701. Shaping groove. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] As Figures 1-5 The utility model provides a technical scheme: a kind of photovoltaic interconnection copper strip continuous cold extrusion combined die, including the flattening press wheel mould 2 being arranged above copper bar 1, distribution press wheel mould 3 and shaping press wheel mould 4 and the flattening support wheel mould 5 being arranged below copper bar 1, distribution support wheel mould 6 and shaping support wheel mould 7, flattening press wheel mould 2 and flattening support wheel mould 5 position correspond, distribution press wheel mould 3 and distribution support wheel mould 6 position correspond, shaping press wheel mould 4 and shaping support wheel mould 7 position correspond, copper bar 1 is extruded into preliminary blank 101 by flattening press wheel mould 2 and flattening support wheel mould 5, preliminary blank 101 is extruded into secondary blank 102 by distribution press wheel mould 3 and distribution support wheel mould 6, secondary blank 102 is extruded into copper strip 103 by shaping press wheel mould 4 and shaping support wheel mould 7;

[0024] The circumference of flattening press wheel mould 2 is provided with a circle of extrusion convex rib one 201, the circumference of flattening support wheel mould 5 is provided with a circle of extrusion groove one 501 being engaged with extrusion convex rib one 201, and the circumference of extrusion convex rib one 201 and the inner wall of the circumference of extrusion groove one 501 are respectively provided with a circle of upper displacement slot one 202 and lower displacement slot one 502 corresponding to the position of copper bar 1;

[0025] The circumference of distribution press wheel mould 3 is provided with a circle of extrusion convex rib two 301, the circumference of distribution support wheel mould 6 is provided with a circle of extrusion groove two 601 being engaged with extrusion convex rib two 301, the circumference of extrusion convex rib two 301 and the inner wall of the circumference of extrusion groove two 601 are respectively provided with a circle of upper displacement slot two 302 and lower displacement slot two 602 corresponding to the position of copper bar 1, and the inner wall of the circumference of upper displacement slot two 302 and lower displacement slot two 602 is respectively provided with a circle of upper distribution convex rib 303 and lower distribution convex rib 603, and upper distribution convex rib 303 and lower distribution convex rib 603 are respectively located in the center of upper displacement slot two 302 and lower displacement slot two 602;

[0026] The circumference of shaping press wheel mould 4 is provided with a circle of shaping convex rib 401, and the circumference of shaping support wheel mould 7 is provided with a circle of shaping groove 701 being engaged with shaping convex rib 401;

[0027] The width of extrusion convex rib one 201, extrusion groove one 501, extrusion convex rib two 301, extrusion groove two 601, shaping convex rib 401 and shaping groove 701 is the same, flattening press wheel mould 2, distribution press wheel mould 3 and shaping press wheel mould 4 are located at the same height, flattening support wheel mould 5, distribution support wheel mould 6 and shaping support wheel mould 7 are located at the same height, the diameters corresponding to the circumference of extrusion convex rib one 201, extrusion convex rib two 301 and shaping convex rib 401 are the same, the depth of extrusion groove one 501 is not less than the depth of extrusion groove two 601, and the depth of extrusion groove two 601 is not less than the depth of shaping groove 701.

[0028] The upper displacement slot 202 and the lower displacement slot 502 are circular grooves with the same cross-sectional inner diameter, the upper displacement slot 302 and the lower displacement slot 602 are circular grooves with the same cross-sectional inner diameter, and the cross-sectional inner diameter of the corresponding circular groove of the upper displacement slot 202 and the lower displacement slot 502 is greater than the diameter of the copper bar 1, and the cross-sectional inner diameter of the corresponding circular groove of the upper displacement slot 302 and the lower displacement slot 602 is greater than the cross-sectional inner diameter of the corresponding circular groove of the upper displacement slot 202 and the lower displacement slot 502.

[0029] Working principle:

[0030] By setting the three groups of wheel molds of the flattening pressure wheel mold 2 and the flattening support wheel mold 5, the material distribution pressure wheel mold 3 and the material distribution support wheel mold 6, and the shaping pressure wheel mold 4 and the shaping support wheel mold 7, the thickness of the copper bar 1 is gradually reduced three times in the vertical diameter direction, and when the copper bar 1 is laterally extruded to the two sides by the upper material distribution protruding rib 303 and the lower material distribution protruding rib 603 during the second cold extrusion of the material distribution pressure wheel mold 3 and the material distribution support wheel mold 6, the copper bar 1 is gradually extruded in the vertical diameter direction and the horizontal diameter direction, which is gradual and progressive, and is beneficial to eliminate cracks and internal stress, and ensure that the extrusion size is in place, improve the quality of the copper strip 103, and prolong the service life.

[0031] It should be noted that in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0032] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A continuous cold extrusion die for photovoltaic interconnect copper strip, characterized in that: It includes a flattened pressure roller mold (2), a material distribution pressure roller mold (3), and a shaping pressure roller mold (4) set above the copper rod (1), and a flattened support roller mold (5), a material distribution support roller mold (6), and a shaping support roller mold (7) set below the copper rod (1). The flattened pressure roller mold (2) and the flattened support roller mold (5) are positioned correspondingly, the material distribution pressure roller mold (3) and the material distribution support roller mold (6) are positioned correspondingly, and the shaping pressure roller mold (4) and the shaping support roller mold (7) are positioned correspondingly. The flattened pressure roller mold (2) has a ring of extrusion protrusion 1 (201) on its circumference, and the flattened support roller mold (5) has a ring of extrusion groove 1 (501) that engages with the extrusion protrusion 1 (201) on its circumference. The extrusion protrusion 1 (201) and the inner wall of the extrusion groove 1 (501) are respectively provided with an upper relief groove 1 (202) and a lower relief groove 1 (502) corresponding to the position of the copper rod (1). The material distribution roller mold (3) has a ring of extrusion protrusions (301) on its circumference. The material distribution support roller mold (6) has a ring of extrusion grooves (601) that engage with the extrusion protrusions (301) on its circumference. The extrusion protrusions (301) and the inner wall of the extrusion grooves (601) are respectively provided with an upper relief groove (302) and a lower relief groove (602) corresponding to the position of the copper rod (1). The inner walls of the upper relief grooves (302) and the lower relief grooves (602) are respectively provided with an upper material distribution protrusion (303) and a lower material distribution protrusion (603). The circumference of the shaping pressure roller mold (4) is provided with a ring of shaping protrusions (401), and the circumference of the shaping support roller mold (7) is provided with a ring of shaping grooves (701) that engage with the shaping protrusions (401).

2. The photovoltaic interconnect copper strip continuous cold extrusion combined die according to claim 1, characterized in that: The extrusion protrusion one (201), extrusion groove one (501), extrusion protrusion two (301), extrusion groove two (601), shaping protrusion (401), and shaping groove (701) have the same width.

3. The photovoltaic interconnect copper strip continuous cold extrusion combined die according to claim 1, characterized in that: The flattening pressure roller mold (2), the material distribution pressure roller mold (3), and the shaping pressure roller mold (4) are located at the same height. The flattening support roller mold (5), the material distribution support roller mold (6), and the shaping support roller mold (7) are located at the same height. The diameters of the circumferences of the extrusion protrusion 1 (201), the extrusion protrusion 2 (301), and the shaping protrusion (401) are the same. The depth of the extrusion groove 1 (501) is not less than the depth of the extrusion groove 2 (601), and the depth of the extrusion groove 2 (601) is not less than the depth of the shaping groove (701).

4. The photovoltaic interconnect copper strip continuous cold extrusion combined die according to claim 1, characterized in that: The upper relief groove 1 (202) and the lower relief groove 1 (502) are circular grooves with the same cross-sectional inner diameter. The upper relief groove 2 (302) and the lower relief groove 2 (602) are circular grooves with the same cross-sectional inner diameter. The cross-sectional inner diameter of the circular grooves corresponding to the upper relief groove 1 (202) and the lower relief groove 1 (502) is greater than the diameter of the copper rod (1). The cross-sectional inner diameter of the circular grooves corresponding to the upper relief groove 2 (302) and the lower relief groove 2 (602) is greater than the cross-sectional inner diameter of the circular grooves corresponding to the upper relief groove 1 (202) and the lower relief groove 1 (502).

5. The photovoltaic interconnect copper strip continuous cold extrusion combined die according to claim 1, characterized in that: The upper material distribution protrusion (303) and the lower material distribution protrusion (603) are located at the center of the upper relief groove (302) and the lower relief groove (602), respectively.

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