A copper bar angle welding fixture

Abstract

The present application relates to a fixture for welding the copper busbar at an angle, which belongs to the field of welding technology. The fixture for welding the copper busbar at an angle includes an operating table and a pair of fixing mechanisms. The operating table has a first surface for placing a pair of copper busbars, and the first surface includes a welding area facing the joint of the pair of copper busbars; the pair of fixing mechanisms are relatively arranged on the operating table with the welding area as the center, and the fixing mechanism includes a positioning assembly, and the positioning assembly includes a first positioning member and a second positioning member. The first positioning member and the second positioning member are respectively fitted with the two end surfaces opposite to the copper busbar along its own width direction; wherein the first positioning member and / or the second positioning member are configured to be pushed by the copper busbar to move along the width direction of the copper busbar when the thermal expansion pressure of the copper busbar reaches a threshold. A fixture for welding the copper busbar at an angle provided in an embodiment of the present application can improve the welding yield rate and reduce the risk of defects in the surface and welds of the finished busbar.

Description

Technical Field

[0001] The present application relates to the field of welding technology, and in particular to a copper bar angle welding fixture. Background Art

[0002] Busbar is the name of the conductive material on power distribution equipment. It is made of flat copper (equivalent to electric wire) without an insulation layer. It is painted with corresponding colors or covered with corresponding color casing. It is mainly used to connect indoor transformers to distribution cabinets, then to the main power switch, and then to each sub-switch.

[0003] In order to meet the needs of busbar usage in different environments, multiple copper bars need to be welded to form busbars of different sizes and shapes. When welding two copper bars into a shape with an angle, taking the case where the two copper bars are perpendicular to each other as an example, the conventional welding method is to weld the end face of one copper bar to the side face of the other copper bar near the end. The weld obtained by this welding method is shorter in length and smaller in cross-sectional area at the weld, resulting in lower mechanical strength and weaker flow capacity of the busbar. In order to improve the mechanical strength and flow capacity of the busbar welding point, the end face of the copper bar can be cut into a bevel, and the two copper bars will be joined through the bevel to form the angle required for the busbar, and then the bevels of the two copper bars are welded. This welding method increases the size of the weld, thereby improving the mechanical strength and flow capacity of the weld.

[0004] During the welding process of copper busbars using this welding method, due to the good thermal conductivity of the copper busbar, the starting point of the welding gun (starting from between the two copper busbars or from the sharp point of the angle formed by the two copper busbars) will heat up and expand relatively quickly, causing the angle between the two copper plates to increase or decrease, thereby resulting in a large gap between the two copper plates, affecting the strength of the weld or the angle of the welded busbar not meeting the requirements. Therefore, the copper busbar needs to be fixed during the welding process. After the heat generated by welding is transferred to the entire copper busbar, the copper busbar as a whole will also expand due to the heat. The positioning device on the conventional welding machine clamps or presses the copper busbar to fix it through a fixing mechanism. On the one hand, due to the thin copper busbar and the low hardness of the copper itself, this fixing method may cause the copper busbar to be squeezed and deformed by the fixing mechanism after thermal expansion, resulting in defects such as pits on the surface of the finished busbar, affecting the quality of the finished product. On the other hand, after thermal expansion, the copper busbar may be displaced due to the mutual squeezing between the copper busbar and the fixing mechanism, resulting in a change in the shape of the seam between the copper busbar parts, thereby affecting the quality of the obtained weld. Summary of the Invention

[0005] The purpose of this application is to address the above-mentioned problems and provide a copper busbar angle welding fixing tool, which can improve the welding yield, reduce the risk of defects in the surface and welds of the busbar finished product, and improve the above-mentioned problems.

[0006] This application is achieved through the following technical solutions:

[0007] The present application provides a copper busbar angle welding fixture, which includes an operating table and a pair of fixing mechanisms. The operating table has a first surface for placing a pair of copper busbars, and the first surface includes a welding area facing the joint of the pair of copper busbars; the pair of fixing mechanisms are relatively arranged on the operating table with the welding area as the center, and the fixing mechanism includes a positioning assembly, and the positioning assembly includes a first positioning member and a second positioning member. The first positioning member and the second positioning member are respectively fitted with two end surfaces opposite to the copper busbar along its own width direction; wherein the first positioning member and / or the second positioning member are configured to be pushed by the copper busbar to move along the width direction of the copper busbar when the thermal expansion pressure of the copper busbar reaches a threshold.

[0008] In the technical solution of the embodiment of the present application, the first positioning member is arranged on the first surface, and the second positioning member is movably arranged on the operating table along the width direction of the copper bar. The first positioning member and the second positioning member are respectively fitted with the two end faces opposite to the copper bar along its own width direction. The two positioning components of the two fixing mechanisms respectively position the two copper bars placed on the first surface. The first positioning member is fitted with the outer end face of the copper bar (the end face outside the angle between a pair of copper bars), and the second positioning member is fitted with the inner end face of the copper bar (the end face inside the angle between a pair of copper bars); during the welding process, the welding components (welding gun, solder, welding rod, etc.) will be fitted from between the pair of copper bars. When one side of the seam is welded to the other side (from the inside to the outside of the angle / from the outside to the inside of the angle), in order to melt the solder and the weldment (i.e., the copper busbar) at the seam, the temperature of the welded assembly will rise rapidly. The copper busbar at the starting end of the weld facing the welded assembly will be heated before the copper busbar at the end of the weld. Therefore, the copper busbar at the starting end of the weld will begin to expand due to the heat before other parts, pushing the angle between the two copper busbars inward or outward. The first and second positioning members are respectively attached to the opposite ends of the copper busbar along its own width direction to limit the rotation of the copper busbar, thereby ensuring that the angle of the welded busbar meets product requirements. Because of the good thermal conductivity of copper itself and the heat generated by the current used in argon arc welding passing through the copper busbar, the part of the copper busbar outside the welding area will also expand due to the heat during the welding process. The first positioning member and the second positioning member have a limiting effect on the expansion of the copper busbar in its own width direction, and can guide the copper busbar to expand mainly along its own length direction, reducing the risk that the expansion size of the copper busbar in its own width direction will cause the size of the weld to be lengthened, and the molten solder will be difficult to fill the subsequent extra gap, resulting in a decrease in the strength of the weld at that location; the expansion of the copper busbar in its own width direction will apply pressure to the first positioning member and the second positioning member, and the second positioning member is movably arranged on the operating table along the width direction of the copper busbar. When the pressure applied by the copper busbar to the second positioning member is too large, the second positioning member can push the copper busbar The copper bar is moved away from the first positioning member in the width direction of the copper bar, thereby creating expansion space for the copper bar and preventing the copper bar from being excessively squeezed by the first positioning member and the second positioning member, resulting in indentations and other damage marks on the surface; the first positioning member and the second positioning member in the angle welding fixture provided by the present application can limit the rotation of the copper bar during welding, guide the copper bar to expand mainly along its own length direction, and reduce the risk of damage to the surface of the copper bar caused by excessive squeezing, thereby improving the yield and surface quality of the welded product; furthermore, when the pressure applied to the second positioning member by the thermal expansion of the copper bar reaches a threshold, the second positioning member can reduce the risk of displacement of the copper bar through its own displacement, thereby reducing the risk of the shape or size change of the joint caused by the displacement of the copper bar, resulting in the weld being difficult to fill the deformed joint and reducing the strength of the weld.

[0009] In some embodiments, there may be multiple first positioning members, and the multiple first positioning members are arranged along the length direction of the copper busbar. The projection of at least one of the multiple first positioning members in the width direction of the copper busbar coincides with the second positioning member.

[0010] In the technical solution of the embodiment of the present application, multiple first positioning members are arranged along the length direction of the copper busbar, and the direction of the connection line between the multiple first positioning members and the copper busbar can be a preset direction, so that the copper busbar can be installed on the first surface by fitting with the multiple first positioning members to make its own length direction parallel to the preset direction, thereby reducing the difficulty of installing the copper busbar; the projection of at least one positioning member among the multiple first positioning members in the width direction of the copper busbar coincides with the second positioning member, and when the copper busbar tends to rotate due to local expansion at the welding point or expands due to heat, the forces applied to the copper busbar by the first positioning member and the second positioning member are on the same straight line and in opposite directions, and the two can offset each other, thereby avoiding the situation where the forces applied to the copper busbar by the first positioning member and the second positioning member are staggered to form shear force on the copper busbar, causing the copper busbar to bend or even break.

[0011] In some embodiments, the first surface is provided with a plurality of mounting holes, and the first positioning member is detachably disposed in the mounting holes.

[0012] In the technical solution of the embodiment of the present application, the first surface is provided with a plurality of mounting holes, and the plurality of positioning holes can be arranged in a circle with the intersection line of the outer end surfaces of a pair of copper busbars placed on the first surface as the center of the circle. The first positioning member is detachably provided on the mounting hole, and the second positioning member is detachably installed on the operating table, so that the first positioning member can be installed by selecting the mounting hole at the corresponding position according to the angle of the welded busbar, and the second positioning member can also be replaced according to the angle of the copper busbar, so that the copper busbar angle welding fixing tool provided in the present application can adapt to the welding requirements of busbars with different angles.

[0013] In some embodiments, an extension portion is further provided on the end surface of the operating table facing the operator, the top surface of the extension portion is flush with the first surface, the welding area extends to the extension portion, the second positioning member is in contact with the inner end surface of the copper busbar, and the second positioning member includes a guide portion and a movable portion. The guide portion connects the operating table and the extension portion, the guide portion extends along the width direction of the copper busbar, the movable portion is movably mounted on the guide portion, and the movable portion is in contact with the copper busbar along the guide portion.

[0014] In the technical solution of the embodiment of the present application, the extension portion can play a certain supporting role for the portion of the copper busbar that exceeds the first surface, and can support the guide portion, so that the guide portion and the movable portion can be suspended in the air, making it convenient for the operator to push the movable portion to fit it with the inner end surface of the copper busbar or for the copper busbar to expand and push the movable portion to move along the guide portion.

[0015] In some embodiments, the guide portion is a screw rod, the movable portion is a nut, the nut is threadedly connected to the screw rod, the screw rod is lower than the first surface, and the nut exceeds the first surface.

[0016] In the technical solution of the embodiment of the present application, the guide part is a screw rod, the movable part is a nut, the nut is threadedly connected to the screw rod, and the nut is used to fit with the inner end surface of the copper busbar. The operator can rotate the nut to make it move along the screw rod in the width direction of the copper busbar. When the pressure applied to the nut after the copper busbar expands is large, it can also push the nut to rotate and move along the screw rod to avoid damage to its own surface due to excessive extrusion. The structure is simple and the effect is stable.

[0017] In some embodiments, a groove adapted to the movable portion is provided on the surface of the extension portion facing the second positioning member, the groove is surrounded by the second surface and the third surface, the second surface is parallel to the width direction of the copper busbar, the guide portion is connected to the third surface, and the third surface is perpendicular to the width direction of the copper busbar.

[0018] In the technical solution of the embodiment of the present application, the second surface is parallel to the width direction of the copper busbar, so as to prevent the second surface from blocking the movement of the movable part on the guide part. The surface of the movable part facing away from the copper busbar is parallel to the third surface, so that the movable part can fit with the third surface when it moves to the end along the guide part. The third surface can evenly apply stress to the movable part, thereby reducing the risk of the movable part being skewed due to uneven force, and improving the stability of the second positioning member.

[0019] In some embodiments, a forming support plate is embedded in the welding area of the first surface, the top surface of the forming support plate is flush with the first surface, the projection of the copper busbar's seam on the first surface does not exceed the forming support plate, and the forming support plate is provided with a forming groove facing the seam of the copper busbar.

[0020] In the technical solution of the embodiment of the present application, the projection of the joint of the copper busbar on the first surface does not exceed the forming support plate, so that the heat affected zone of welding does not exceed the forming support plate, reducing the risk of heat generated by welding affecting the operating table, and the forming support plate is provided with a forming groove facing the joint of the copper busbar, and the forming groove faces the joint between the two copper buses to be welded. During the welding process, the liquid metal between the joints of the two copper buses flows toward the second-side forming support plate under the action of gravity, and the liquid metal can continue to flow to the forming groove after exceeding the joint. The liquid metal fills the forming groove, thereby extending the joint to the opening on the surface where the copper busbar 2 contacts the copper busbar forming support plate, completely covering it, so that the part of the weld structure of the completed weld close to the opening on the surface where the copper busbar contacts the forming support plate is a dense metal body, reducing the risk of volume reduction of the liquid metal during cooling and solidification and the formation of gaps between the part close to the surface where the copper busbar contacts the forming support plate, thereby reducing the strength of the weld area of the welded busbar.

[0021] In some embodiments, a positioning mechanism is further included, which is arranged on the first surface. The length direction of the seam of a pair of copper bars located on the first surface is the first direction. The positioning mechanism includes a first driving member and a stopper. The stopper has a positioning surface for tightly contacting the copper bar. The first driving member drives the stopper to move along the first direction to enter or leave the welding area.

[0022] In the technical solution of the embodiment of the present application, the stopper has a positioning surface for being in close contact with the copper busbar, and the first driving member drives the stopper to move along the first direction to enter or leave the welding area. Before a pair of copper busbars are installed on the first surface, the first driving member drives the stopper to enter the welding area, and then a copper busbar is placed on the first surface, and the length direction of the copper busbar is determined by fitting with the first positioning member, and then the surface to be welded of the copper busbar is fitted with the positioning surface of the stopper to determine that the position of the weld can be located at the center of the welding area, and then the second positioning member (and the clamping assembly) is moved to fix the position of the copper busbar on the first surface, and then the first driving member drives the stopper to leave the welding area, and another copper busbar is placed on the first surface, and a joint is obtained by fitting the surface to be welded of the other copper busbar with the surface to be welded of the fixed copper busbar, and then the other copper busbar is installed on the first surface according to the installation steps of the previous copper busbar, thereby completing the installation of the two copper busbars on the first surface; the positioning mechanism provided by the present application can determine the position of the joint of the installed pair of copper busbars through the stopper, which is convenient for position alignment of subsequent processes and eliminates the subsequent step of positioning the welding assembly relative to the joint.

[0023] In some embodiments, the fixing mechanism also includes a clamping assembly, which includes a second driving member and a pressure plate. The clamping assembly is configured to switch between a clamping state and a loosening state, so that the pressure plate is driven by the second driving member to rise and fall to press the copper busbar on the first surface or loosen the copper busbar.

[0024] In the technical solution of the embodiment of the present application, the clamping assembly is configured to switch between a clamped state and a loosened state. The clamping assembly can press the copper busbar that has been positioned by the positioning assembly (and the positioning mechanism) on the first side to fix it, thereby reducing the risk of the copper busbar being displaced during welding, resulting in changes in the size or shape of the joint, and causing the formed weld to have more gaps inside, affecting the strength of the weld.

[0025] In some embodiments, the pressing assembly further includes a baffle, which is located on a side of the pressing plate close to the welding area, and the pressing plate is closer to the welding area than the positioning assembly.

[0026] In the technical solution of the embodiment of the present application, the baffle is located on the side of the pressure plate close to the welding area. The baffle separates the welding area from other areas. On the one hand, it reduces the impact of welding heat on other areas, and on the other hand, it blocks the loss of welding heat, allowing the welding area to maintain the welding temperature more easily during welding. The pressure plate is closer to the welding area than the positioning component, allowing the baffle to block the heat radiation from the welding area to the positioning part, thereby reducing the risk of the positioning component melting and deforming due to high temperature.

[0027] In some embodiments, a flow channel for fluid to pass through is provided inside the pressing plate, and the length direction of the pressing plate is parallel to the joint of the pair of copper bars placed on the first surface.

[0028] In the technical solution of the embodiment of the present application, a flow channel for fluid to pass through is provided inside the pressure plate. During the welding process, a large amount of heat is generated in the welding process. The fluid in the flow channel in the pressure plate can have a certain initial temperature, so that the fluid in the flow channel can transfer heat to the copper busbar before welding, so that the copper plate around the welding area has a certain initial temperature. On the one hand, the heating speed of the welding area during welding is accelerated, and the amount of copper busbar melted at the joint is increased, thereby increasing the density of the weld and improving the strength of the weld. On the other hand, the temperature difference between the copper busbar in the welding area and the copper busbar in other areas can be reduced, thereby slowing down the speed of heat transfer from the welding area of the copper busbar to other areas of the copper busbar, allowing heat to be concentrated in the welding area, and improving the welding quality. When the temperature of the copper busbar is higher than the temperature of the fluid in the flow channel, the fluid can absorb the heat of the copper busbar. The heat of the copper busbar is gradually transferred from the welding area to the side of the copper busbar away from the welding area. The fluid will begin to absorb the heat of the copper busbar when it leaves the welding area, so that the copper busbar can transfer less heat to the side away from the welding area, thereby suppressing the temperature rise of the copper busbar outside the welding area. On the one hand, the temperature of the copper busbar outside the welding area will not be too high during the welding process, so it is not easy to react with oxygen and other substances in the air, reducing the generation of substances with poor conductivity such as copper oxide on the surface of the copper busbar, and reducing the risk of the welded busbar being affected by impurities such as copper oxide on the surface and reducing its own conductivity. The length direction of the pressing plate is parallel to the joint of the pair of copper busbars placed on the first surface, so that the dimensions of each part of the pressing plate and the joint are similar, so that the fluid in the flow channel in the pressing plate has a similar temperature control effect on each part of the joint.

[0029] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic diagram of the overall structure of the copper bar angle welding fixture provided in some embodiments of the present application;

[0032] Figure 2 A schematic diagram of the structure of a copper bar angle welding fixture when the stopper is located in the welding area provided in some embodiments of the present application;

[0033] Figure 3 A schematic diagram of a portion of the structure of a copper bar angle welding fixture provided in some embodiments of the present application;

[0034] Figure 4 A top view of a copper bar angle welding fixture provided in some embodiments of the present application;

[0035] Figure 5 A front view of a pressure plate provided for some embodiments of the present application;

[0036] Figure 6 for Figure 5 Cross-sectional view at AA in the middle.

[0037] Icons: 1-operating table; 10-first surface; 100-welding area; 101-mounting hole; 11-extension part; 111-second surface; 112-third surface; 12-molding support plate; 120-molding groove; 2-fixing mechanism; 20-positioning assembly; 200-first positioning member; 201-second positioning member; 2010-guide part; 2011-movable part; 21-clamping assembly; 210-second driving member; 211-pressure plate; 2110-flow channel; 212-baffle; 3-copper busbar; 4-positioning mechanism; 40-first driving member; 41-stop block; 410-positioning surface. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0039] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0040] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0042] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0043] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0044] According to some embodiments of the present application, optionally, Figures 1 to 4As shown, the present application provides a copper busbar angle welding fixture, which includes an operating table 1 and a pair of fixing mechanisms 2. The operating table 1 has a first surface 10 for placing a pair of copper busbars 3, and the first surface 10 includes a welding area 100 facing the joint of the pair of copper busbars 3; the pair of fixing mechanisms 2 are relatively arranged on the operating table 1 with the welding area 100 as the center, and the fixing mechanism 2 includes a positioning assembly 20, and the positioning assembly 20 includes a first positioning member 200 and a second positioning member 201. The first positioning member 200 and the second positioning member 201 are respectively fitted with the two end surfaces opposite to the copper busbar 3 along its own width direction; wherein the first positioning member 200 and / or the second positioning member 201 are configured to be pushed by the copper busbar 3 to move along the width direction of the copper busbar 3 when the thermal expansion pressure of the copper busbar 3 reaches a threshold value.

[0045] The copper busbar angle welding fixture provided in the present application can be used for welding a pair of copper buses 3 with an angle between them (an angle less than 180°) or a pair of copper buses 3 with parallel length directions. The present application describes a pair of copper buses 3 with an angle between them as an example.

[0046] The copper bar angle welding fixture provided in the present application can be applied to a welding machine, with the welding gun of the welding machine facing the welding area 100 .

[0047] The first surface 10 is the top surface of the operating table 1. One side of the operating table 1 is the operating side where the operator stands. The copper busbar 3 is placed close to the operating side. The operator stands between a pair of copper busbars 3 placed on the first surface 10. The second positioning member 201 is closer to the operator than the first positioning member, which makes it easier for the operator to determine the position of the second positioning member 201 so that the second positioning member 201 can fit with copper busbars 3 of different widths.

[0048] The welding area 100 is located at the center of the first face 10 .

[0049] When welding a copper busbar 3 with a longer length using a welding machine using the copper busbar angle welding fixture provided in this application, an auxiliary lifting bracket can be installed on the side of the operating table 1 to support the portion of the copper busbar 3 that extends beyond the first surface 10, thereby preventing the portion of the copper busbar 3 located on the first surface 10 from being tilted or bending due to the excessive weight of the suspended portion of the copper busbar 3.

[0050] In the process of installing a pair of copper busbars 3 to the first surface 10, first place the outer end face (the end face outside the angle) of a copper busbar 3 on the first surface 10 along the first positioning piece 200, so that the part to be welded of this copper busbar 3 is located in the welding area 100, then adjust the position of the second positioning piece 201, so that the second positioning piece 201 is fitted with the inner end face (the end face inside the angle) of the copper busbar 3, and press it to the first surface 10 through the clamping component 21, then fit the other copper busbar 3 with the first positioning piece 200 through the outer end face, and fit the welding part with the welding part of the previous copper busbar 3 to form a seam, then adjust the position of the other second positioning piece 201 to fit with the inner end face of the copper busbar 3, and finally press it to the first surface 10 through the clamping component 21 to complete the installation of the two copper busbars 3.

[0051] Welding, also known as fusion, is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics by heating, high temperature or high pressure.

[0052] The method used to weld the copper busbar 3 in this application is TIG welding. Arc welding is the most widely used welding method in industrial production. The metal to be welded serves as one electrode, and the welding rod serves as the other. When the two electrodes are close together, an arc is generated. The heat generated by the arc discharge (commonly known as arc combustion) is used to melt the welding rod and the workpiece together, and after condensation, a weld is formed, thereby obtaining a strong joint. TIG welding (Tungsten Inert Gas Welding), also known as non-consumable inert gas shielded arc welding, is an arc welding method that generates heat between a non-consumable electrode and the workpiece, and is often referred to as tungsten inert gas welding.

[0053] The solder used in welding the copper busbar 3 is red copper welding wire.

[0054] The threshold value mentioned in this application is smaller than the pressure value required for the copper busbar 3 to undergo mechanical deformation when heated.

[0055] The first positioning member 200 is provided on the first surface 10, and the second positioning member 201 is movably provided on the operating table 1 along the width direction of the copper busbar 3. The first positioning member 200 and the second positioning member 201 are respectively fitted with the two end faces of the copper busbar 3 opposite to each other along its own width direction. The two positioning components 20 of the two fixing mechanisms 2 respectively position the two copper busbars 3 placed on the first surface 10. The first positioning member 200 is fitted with the outer end face of the copper busbar 3 (the end face outside the angle between a pair of copper busbars 3), and the second positioning member 201 is fitted with the inner end face of the copper busbar 3 (the end face inside the angle between a pair of copper busbars 3); during the welding process, the welding components (welding gun, solder, welding rod, etc.) will be fitted from the pair of copper busbars. 3 is welded to the other side of the seam between them (from the inside to the outside of the angle / from the outside to the inside of the angle). During welding, in order to melt the solder and the weldment (i.e., the copper busbar 3) at the seam, the temperature of the welding assembly will rise rapidly, and the copper busbar 3 at the starting end of the welding assembly will be heated before the copper busbar 3 at the end of the welding. Therefore, the copper busbar 3 at the starting end of the welding will begin to expand due to heat before other parts, pushing the angle between the two copper busbars 3 inward or outward. The first positioning member 200 and the second positioning member 201 are respectively fitted with the opposite ends of the copper busbar 3 along its own width direction to limit the rotation of the copper busbar 3, thereby ensuring that the angle of the welded busbar meets product requirements.Because of the good thermal conductivity of copper itself and the heat generated by the current used in argon arc welding passing through the copper busbar 3, the part of the copper busbar 3 outside the welding area 100 will also expand due to heat during the welding process. The first positioning member 200 and the second positioning member 201 have a limiting effect on the expansion of the copper busbar 3 in its own width direction, and can guide the copper busbar 3 to expand mainly along its own length direction, reducing the risk that the expansion size of the copper busbar 3 in its own width direction will cause the size of the weld to be lengthened, and the molten solder will be difficult to fill the subsequent extra gap, resulting in a decrease in the strength of the weld there; the expansion of the copper busbar 3 in its own width direction will apply pressure to the first positioning member 200 and the second positioning member 201, and the second positioning member 201 is movably arranged on the operating table 1 along the width direction of the copper busbar 3. When the pressure applied by the copper busbar 3 to the second positioning member 201 is too large, the second positioning member 201 can be at the copper busbar 3 Under the push of the copper bar 3, it moves away from the first positioning piece 200 along the width direction of the copper bar 3, thereby leaving expansion space for the copper bar 3, and preventing the copper bar 3 from being over-extruded by the first positioning piece 200 and the second positioning piece 201, resulting in indentations and other damage marks on the surface; the first positioning piece 200 and the second positioning piece 201 in the angle welding fixture provided by the present application can limit the rotation of the copper bar 3 during the welding process, guide the copper bar 3 to expand mainly along its own length direction, and reduce the risk of excessive extrusion and damage to the surface of the copper bar 3, thereby improving the yield and surface quality of the welded product; furthermore, when the pressure applied to the second positioning piece 201 by the thermal expansion of the copper bar 3 reaches a threshold, the second positioning piece 201 can reduce the risk of displacement of the copper bar 3 through its own displacement, thereby reducing the risk of the shape or size change of the joint caused by the displacement of the copper bar 3, resulting in the weld being difficult to fill the deformed joint and reducing the strength of the weld.

[0056] According to some embodiments of the present application, optionally, Figures 1 and 2 As shown, there can be multiple first positioning members 200 , which are arranged along the length direction of the copper busbar 3 , and the projection of at least one of the multiple first positioning members 200 in the width direction of the copper busbar 3 coincides with the second positioning member 201 .

[0057] The number of the plurality of first positioning members 200 may be two, three, four, five, six, seven, eight, nine, ten or more.

[0058] The contact surface between the first positioning member 200 and the copper busbar 3 may be an arc surface.

[0059] Multiple first positioning members 200 are arranged along the length direction of the copper busbar 3, and the direction of the connection line at the contact points between the multiple first positioning members 200 and the copper busbar 3 can be a preset direction, so that the copper busbar 3 can be installed on the first surface 10 by fitting with the multiple first positioning members 200 so that its own length direction is parallel to the preset direction, thereby reducing the difficulty of installing the copper busbar 3; the projection of at least one positioning member in the width direction of the copper busbar 3 among the multiple first positioning members 200 coincides with the second positioning member 201. When the copper busbar 3 has a tendency to rotate due to local expansion at the welding point or expands due to heat, the forces applied to the copper busbar 3 by the first positioning member 200 and the second positioning member 201 are on the same straight line and in opposite directions, and the two can offset each other, thereby avoiding the situation where the forces applied to the copper busbar 3 by the first positioning member 200 and the second positioning member 201 are staggered to form shear force on the copper busbar 3, causing the copper busbar 3 to bend or even break.

[0060] According to some embodiments of the present application, optionally, Figures 2 to 4 As shown, the first surface 10 is provided with a plurality of mounting holes 101 , and the first positioning member 200 is detachably provided in the mounting holes 101 .

[0061] The number of the plurality of mounting holes 101 may be two, three, four, five, six, seven, eight, nine, ten or more.

[0062] The number of the mounting holes 101 is not less than the number of the first positioning members 200 , and the mounting holes 101 correspond to the first positioning members 200 one by one.

[0063] The first mounting member may be a positioning pin, which is inserted into the mounting hole 101 , and has a simple installation and a stable effect.

[0064] The first surface 10 is provided with a plurality of mounting holes 101, and the plurality of positioning holes can be arranged in a circle with the intersection line of the outer end surfaces of a pair of copper busbars 3 placed on the first surface 10 as the center of the circle. The first positioning member 200 is detachably provided on the mounting hole 101, and the second positioning member 201 is detachably installed on the operating table 1, so that the first positioning member 200 can select the mounting hole 101 at the corresponding position for installation according to the angle of the welded busbar, and the second positioning member 201 can also be replaced according to the angle of the copper busbar 3, so that the copper busbar angle welding fixing tooling provided in this application can adapt to the welding requirements of busbars with different angles.

[0065] According to some embodiments of the present application, optionally, Figures 1 to 4As shown, the end surface of the operating table 1 facing the operator is further provided with an extension portion 11, the top surface of the extension portion 11 is flush with the first surface 10, the welding area 100 extends to the extension portion 11, the second positioning member 201 is in contact with the inner end surface of the copper busbar 3, and the second positioning member 201 includes a guide portion 2010 and a movable portion 2011. The guide portion 2010 connects the operating table 1 and the extension portion 11, and the guide portion 2010 extends along the width direction of the copper busbar 3. The movable portion 2011 is movably sleeved on the guide portion 2010, and the movable portion 2011 is in contact with the copper busbar 3 along the guide portion 2010.

[0066] The extension portion 11 can be detachably connected to the operating table 1 .

[0067] There is a gap between the guide portion 2010 and the copper busbar 3 .

[0068] The end surface of the operating table 1 may be provided with a mounting seat for mounting the guide portion 2010 .

[0069] The extension portion 11 can provide a certain degree of support for the portion of the copper busbar 3 that extends beyond the first surface 10, and can support the guide portion 2010, allowing the guide portion 2010 and the movable portion 2011 to be suspended in the air, making it easier for the operator to push the movable portion 2011 to fit against the inner end surface of the copper busbar 3 or for the copper busbar 3 to expand and push the movable portion 2011 to move along the guide portion 2010.

[0070] According to some embodiments of the present application, optionally, the guide portion 2010 is a screw rod, the movable portion 2011 is a nut, the nut is threadedly connected to the screw rod, the screw rod is lower than the first surface 10, and the nut exceeds the first surface 10.

[0071] The guide part 2010 is a screw rod, and the movable part 2011 is a nut. The nut is threadedly connected to the screw rod. The nut is used to fit with the inner end surface of the copper busbar 3. The operator can rotate the nut to make it move along the screw rod in the width direction of the copper busbar 3. When the copper busbar 3 expands and the pressure applied to the nut is large, it can also push the nut to rotate and move along the screw rod to avoid damage to its own surface due to excessive extrusion. The structure is simple and the effect is stable.

[0072] According to some embodiments of the present application, optionally, Figure 4 As shown, the surface of the extension portion 11 facing the second positioning member 201 is provided with a groove adapted to the movable portion 2011, and the groove is surrounded by the second surface 111 and the third surface 112. The second surface 111 is parallel to the width direction of the copper busbar 3, and the guide portion 2010 is connected to the third surface 112, and the third surface 112 is perpendicular to the width direction of the copper busbar 3.

[0073] The second surface 111 is parallel to the width direction of the copper busbar 3, so that the second surface 111 does not block the movement of the movable part 2011 on the guide part 2010. The surface of the movable part 2011 facing away from the copper busbar 3 is parallel to the third surface 112, so that the movable part 2011 can be in contact with the third surface 112 when it moves to the end along the guide part 2010. The third surface 112 can evenly apply stress to the movable part 2011, reducing the risk of the movable part 2011 being skewed due to uneven force, thereby improving the stability of the second positioning member 201.

[0074] According to some embodiments of the present application, optionally, Figures 2 to 4 As shown, the welding area 100 of the first surface 10 is embedded with a forming support plate 12, the top surface of the forming support plate 12 is flush with the first surface 10, the projection of the joint of the copper busbar 3 on the first surface 10 does not exceed the forming support plate 12, and the forming support plate 12 is provided with a forming groove 120 facing the joint of the copper busbar 3.

[0075] The material of the forming support plate 12 can be graphite. Graphite has excellent high temperature resistance, thermal shock resistance, reducibility, electrical conductivity, and durability. When the forming support plate 12 is made of graphite, it can withstand the high temperatures of welding without damage or deformation, and can be used for a long time without being easily damaged.

[0076] The projection of the joint of the copper busbar 3 on the first surface 10 does not exceed the forming support plate 12, so that the heat affected zone of welding does not exceed the forming support plate 12, reducing the risk of the heat generated by welding affecting the operating table 1, and the forming support plate 12 is provided with a forming groove 120 facing the joint of the copper busbar 3, and the forming groove 120 faces the joint between the two copper busbars 3 to be welded. During the welding process, the liquid metal between the joints of the two copper busbars 3 flows toward the forming support plate 12 on the second surface 111 under the action of gravity. The liquid metal can continue to flow to the forming groove 120 after exceeding the joint. The liquid metal fills the forming groove 120, thereby completely covering the opening of the joint extending to the surface where the copper busbar 32 contacts the forming support plate 12 of the copper busbar 3, so that the part of the weld structure of the completed weld close to the opening of the surface where the copper busbar 3 contacts the forming support plate 12 is a dense metal body, reducing the risk of the liquid metal shrinking in volume during cooling and solidification and the formation of gaps between the part close to the surface where the copper busbar 3 contacts the forming support plate 12, thereby reducing the strength of the weld area of the welded busbar.

[0077] According to some embodiments of the present application, optionally, Figure 2 As shown, it also includes a positioning mechanism 4, which is arranged on the first surface 10. The length direction of the joint of a pair of copper busbars 3 located on the first surface 10 is the first direction. The positioning mechanism 4 includes a first driving member 40 and a stopper 41. The stopper 41 has a positioning surface 410 for tightly contacting the copper busbar 3. The first driving member 40 drives the stopper 41 to move along the first direction to enter or leave the welding area 100.

[0078] There can be two positioning mechanisms 4 , and the stoppers 41 of the two positioning mechanisms 4 can be respectively used to fit with the end surface of any one of the two copper bars 3 to be welded facing the other copper bar 3 .

[0079] The stopper 41 is in contact with the first surface 10 , and the first surface 10 can support the stopper 41 to prevent the stopper 41 from sagging due to its own gravity.

[0080] The stopper 41 has a positioning surface 410 for being in close contact with the copper busbar 3. The first driving member 40 drives the stopper 41 to move in the first direction to enter or leave the welding area 100. Before a pair of copper busbars 3 are installed on the first surface 10, the first driving member 40 drives the stopper 41 to enter the welding area 100, and then a copper busbar 3 is placed on the first surface 10. The length direction of the copper busbar 3 is determined by fitting with the first positioning member 200, and then the surface to be welded of the copper busbar 3 is fitted with the positioning surface 410 of the stopper 41 to determine that the position of the weld can be located at the center of the welding area 100, and then the second positioning member 201 (and the pressing assembly 21) is moved to move the copper busbar 3. The position of the copper busbar 3 is fixed on the first surface 10, and then the first driving member 40 drives the stopper 41 to leave the welding area 100, and another copper busbar 3 is placed on the first surface 10. A joint is obtained by fitting the surface to be welded of the other copper busbar 3 with the surface to be welded of the already fixed copper busbar 3, and then installing the other copper busbar 3 on the first surface 10 according to the installation steps of the previous copper busbar 3, thereby completing the installation of the two copper busbars 3 on the first surface 10; the positioning mechanism 4 provided in the present application can determine the position of the joint of a pair of copper busbars 3 after installation through the stopper 41, which is convenient for position alignment of subsequent processes and eliminates the subsequent step of positioning the welding assembly relative to the joint.

[0081] According to some embodiments of the present application, optionally, Figures 1 to 5 As shown, the fixing mechanism 2 also includes a clamping assembly 21, which includes a second driving member 210 and a pressure plate 211. The clamping assembly 21 is configured to switch between a clamping state and a loosening state, so that the pressure plate 211 is driven by the second driving member 210 to rise and fall to press the copper bus 3 on the first surface 10 or loosen the copper bus 3.

[0082] The lifting and lowering of the pressing components 21 in a pair of fixing mechanisms 2 can be adapted to the installation or removal progress of the copper busbar 3 and can be performed independently or synchronously.

[0083] The clamping assembly 21 is configured to switch between a clamped state and a loosened state. The clamping assembly 21 can clamp the copper busbar 3 positioned by the positioning assembly 20 (and the positioning mechanism 4) on the first surface 10 to fix it, thereby reducing the risk of displacement of the copper busbar 3 during welding, resulting in changes in the size or shape of the joint and causing more gaps inside the formed weld to affect the strength of the weld.

[0084] According to some embodiments of the present application, optionally, Figures 2 to 4 As shown, the pressing assembly 21 further includes a baffle 212 , which is located on a side of the pressing plate 211 close to the welding area 100 . The pressing plate 211 is closer to the welding area 100 than the positioning assembly 20 .

[0085] The spacing between the two baffles 212 may be equal to the width of the welding area 100 ; or, the spacing between the two baffles 212 may be greater than the width of the welding area 100 .

[0086] The baffle 212 may be provided with a heat reflective coating or a heat insulating coating on the side facing the welding area 100 ; alternatively, a polystyrene interlayer may be provided on the inner side of the baffle 212 .

[0087] The baffle 212 can be a polystyrene board, a rock wool board, a perlite board, an extruded polystyrene thermal insulation board, etc.

[0088] The baffle 212 is located on the side of the pressure plate 211 close to the welding area 100. The baffle 212 separates the welding area 100 from other areas. On the one hand, it reduces the impact of welding heat on other areas. On the other hand, it blocks the loss of welding heat, allowing the welding area 100 to more easily maintain the welding temperature during welding. Compared with the positioning component 20, the pressure plate 211 is closer to the welding area 100, allowing the baffle 212 to block the heat radiation from the welding area 100 to the positioning member, thereby reducing the risk of the positioning component 20 melting and deforming due to high temperature.

[0089] According to some embodiments of the present application, optionally, Figures 4 to 6 As shown, a flow channel 2110 for fluid to pass through is provided inside the pressing plate 211 , and the length direction of the pressing plate 211 is parallel to the joint of a pair of copper busbars 3 placed on the first surface 10 .

[0090] The fluid may be a liquid or a gas, for example, when the fluid is a gas, the fluid may be air, or when the fluid is a liquid, the fluid may be, but is not limited to, water, oil, a mixture of water and ethylene glycol, etc. This application is described by taking the fluid as a liquid as an example.

[0091] The pressure plate 211 is provided with a flow channel 2110 for fluid to pass through. During the welding process, a large amount of heat is generated in the welding process. The fluid in the flow channel 2110 in the pressure plate 211 can have a certain initial temperature, so that the fluid in the flow channel 2110 can transfer heat to the copper busbar 3 before welding, so that the copper plate around the welding area 100 has a certain initial temperature. On the one hand, the heating speed of the welding area 100 is accelerated during welding, and the amount of copper busbar 3 melted at the joint is increased, thereby increasing the density of the weld and improving the strength of the weld. On the other hand, the temperature difference between the copper busbar 3 in the welding area 100 and the copper busbar 3 in other areas can be reduced, thereby slowing down the speed of heat transfer from the welding area 100 of the copper busbar 3 to other areas of the copper busbar 3, allowing the heat to be concentrated in the welding area 100, thereby improving the welding quality. When the temperature of the copper busbar 3 is higher than the temperature of the fluid in the flow channel 2110, the fluid can absorb the heat of the copper busbar 3, and the copper busbar 3 The heat is gradually transferred from the welding area 100 to the side of the copper busbar 3 away from the welding area 100. The fluid begins to absorb the heat of the copper busbar 3 when it leaves the welding area 100, so that the copper busbar 3 can transfer less heat to the side away from the welding area 100, thereby suppressing the temperature rise of the copper busbar 3 other than the welding area 100. On the one hand, the temperature of the copper busbar 3 other than the welding area 100 will not be too high during the welding process, so that it is not easy to react with substances such as oxygen in the air, reducing the generation of substances with poor conductivity such as copper oxide on the surface of the copper busbar 3, and reducing the risk of the welded busbar being affected by impurities such as copper oxide on the surface and reducing its own conductivity. The length direction of the pressing plate 211 is parallel to the joint of the pair of copper busbars 3 placed on the first surface 10, so that the dimensions of each part of the pressing plate 211 and the joint are similar, so that the fluid in the flow channel 2110 in the pressing plate 211 has a similar temperature control effect on each part of the joint.

[0092] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A copper bar angle welding fixture, characterized in that: include: An operating table having a first surface for placing the pair of copper busbars, wherein the first surface includes a welding area facing the joint of the pair of copper busbars; a pair of fixing mechanisms, disposed opposite to the operating table with the welding area as the center, the fixing mechanisms including a positioning assembly, the positioning assembly including a first positioning member and a second positioning member, the first positioning member and the second positioning member being in contact with two end surfaces of the copper busbar that are opposite to each other along its width direction; The first positioning member and / or the second positioning member are configured to be pushed by the copper bar to move along the width direction of the copper bar when the thermal expansion pressure of the copper bar reaches a threshold value, so as to avoid the copper bar being excessively squeezed by the first positioning member and the second positioning member, resulting in damage marks on its surface.

2. A copper bar angle welding fixture according to claim 1, characterized in that: The end surface of the operating table facing the operator is further provided with an extension portion, the top surface of the extension portion is flush with the first surface, and the welding area extends to the extension portion; The second positioning member is in contact with the inner end surface of the copper busbar. The second positioning member includes a guide portion and a movable portion. The guide portion connects the operating table and the extension portion. The guide portion extends along the width direction of the copper busbar. The movable portion is movably sleeved on the guide portion. The movable portion is in contact with the copper busbar along the guide portion.

3. A copper bar angle welding fixture according to claim 2, characterized in that: The guide portion is a screw rod, the movable portion is a nut, the nut is threadedly connected to the screw rod, the screw rod is lower than the first surface, and the nut exceeds the first surface.

4. A copper bar angle welding fixture according to claim 2, characterized in that: A groove adapted to the movable portion is provided on the surface of the extension portion facing the second positioning member, and the groove is surrounded by a second surface and a third surface, the second surface is parallel to the width direction of the copper busbar, and the guide portion is connected to the third surface, and the third surface is perpendicular to the width direction of the copper busbar.

5. The copper bar angle welding fixture according to claim 1, characterized in that: There are multiple first positioning members, and the multiple first positioning members are arranged along the length direction of the copper busbar. The projection of at least one of the multiple first positioning members in the width direction of the copper busbar coincides with the second positioning member.

6. The copper bar angle welding fixture according to claim 1, characterized in that: It also includes a positioning mechanism, which is arranged on the first surface, and the length direction of the joint of a pair of copper bars located on the first surface is the first direction. The positioning mechanism includes a first driving member and a stopper, and the stopper has a positioning surface for tightly contacting the copper bar. The first driving member drives the stopper to move along the first direction to enter or leave the welding area.

7. The copper bar angle welding fixture according to claim 1, characterized in that: The first surface is provided with a plurality of mounting holes, and the first positioning member is detachably arranged in the mounting holes.

8. The copper bar angle welding fixture according to claim 1, characterized in that: A forming support plate is embedded in the welding area of the first surface, the top surface of the forming support plate is flush with the first surface, the projection of the seam of the copper busbar on the first surface does not exceed the forming support plate, and the forming support plate is provided with a forming groove facing the seam of the copper busbar.

9. The copper bar angle welding fixture according to claim 1, characterized in that: The fixing mechanism also includes a clamping assembly, which includes a second driving member and a pressure plate. The clamping assembly is configured to switch between a clamping state and a loosening state, so that the pressure plate is driven by the second driving member to rise and fall to press the copper busbar against the first surface or loosen the copper busbar.

10. A copper bar angle welding fixture according to claim 9, characterized in that: A flow channel for fluid to pass through is provided inside the pressing plate, and the length direction of the pressing plate is parallel to the joint of the pair of copper bars placed on the first surface.

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