Resistance welding device

Abstract

The present application discloses a resistance welding device, including a back plate, a support plate, a driving unit, a first welding electrode and a second welding electrode; the first welding contact surface of the first welding electrode includes a first sub-surface, a transition surface and a second sub-surface distributed along the height direction, the first sub-surface can push and heat the first side to be welded of the object to be welded, so that it is welded together with the second side to be welded, the second sub-surface can push and heat the first side to be welded, so that it is welded together with the copper wire, because the first sub-surface is a vertical surface, its contact area with the first side to be welded is larger, the first side to be welded and the second side to be welded can have a larger weld area, and the welding effect is more reliable, the second sub-surface is also designed as a vertical surface, the penetration value of the two copper wires to be welded after welding can be consistent, and the welding effect and consistency are good. The resistance welding device of the embodiment of the present application is not only reliable in welding, but also suitable for welding of double copper wires.

Description

Technical Field

[0001] The present application relates to the field of production equipment for motor stators, and in particular to a resistance welding device. Background Art

[0002] In the prior art, after the brushless stator winding is completed, it needs to enter the welding process. Figure 2 As shown, the copper wire needs to be soldered to the terminal.

[0003] In the existing technical solutions, such as Figure 2 As shown in the figure, the electrode on the left is tilted, and the left and right electrodes are clamped together. After the electrodes are energized, the terminal and the copper wire are hot-melted and welded together. The problems with this solution are: 1. It cannot adapt to the welding of two copper wires with the terminal at the same time, because the copper wire at the bottom may not be welded or the penetration value may not meet the requirements, and the consistency is poor; 2. The flatness rate of the copper wire after welding (that is, the welding penetration value) is difficult to control and is prone to abnormalities. Utility Model Content

[0004] The embodiment of the present application provides a resistance welding device that can be applied to double-wire welding and provides reliable welding.

[0005] The embodiment of the present application discloses a resistance welding device, including a back plate, a support plate, a driving unit, a first welding electrode and a second welding electrode; the back plate is arranged on an external structure, and the back plate can move in the height direction; two support plates are both slidably arranged on the back plate, and the two support plates can slide relative to each other in a first horizontal direction; the driving unit is respectively connected to the two support plates, and is used to drive the two support plates to be relatively close to or away from each other in the first horizontal direction; the first welding electrode and the second welding electrode are respectively arranged on the two support plates; a side surface of the first welding electrode facing the second welding electrode is configured as a first welding contact surface, the first welding contact surface includes a first sub-surface, a transition surface and a second sub-surface distributed along the height direction, the first sub-surface and the second sub-surface are both vertical surfaces, and there is a predetermined distance H1 between the first sub-surface and the second sub-surface in the first horizontal direction; a side surface of the second welding electrode facing the first welding electrode is configured as a second welding contact surface, and a clamping space for clamping the object to be welded is formed between the first welding contact surface and the second welding contact surface.

[0006] Preferably, in the above solution, the first welding contact surface and the second welding contact surface are arranged opposite to each other in the first horizontal direction, and the length L1 of the first welding contact surface is equal to the length L2 of the second welding contact surface.

[0007] In the above scheme, the transition surface includes a first arc surface and a second arc surface, one end of the first arc surface is connected to the first sub-surface, the other end is connected to one end of the second arc surface, and the other end of the second arc surface is connected to the second sub-surface; the first arc surface is convex relative to the second welding contact surface, and the second arc surface is concave relative to the second welding contact surface.

[0008] In the above scheme, preferably, the thickness of the first welding electrode in the second horizontal direction is defined as D1; ​​the thickness of the second welding electrode in the second horizontal direction is defined as D2; the thickness of the first edge to be welded of the object to be welded in the second horizontal direction is defined as D3; the thickness of the second edge to be welded of the object to be welded in the second horizontal direction is defined as D4; D1 is equal to D3, and D2 is equal to D4.

[0009] Preferably, the first welding electrode and the second welding electrode are both made of tungsten steel.

[0010] The above scheme is preferred, wherein the first welding electrode and the second welding electrode are both arranged on the support plate through a mounting seat, and a slide groove is arranged on the mounting seat, and at least part of the first welding electrode or the second welding electrode is arranged in the slide groove; a pressure plate and an adjusting bolt are arranged on the mounting seat, and the pressure plate is used to press the first welding electrode or the second welding electrode in the slide groove, the adjusting bolt is threadedly connected to the mounting seat, and the adjusting bolt is against the first welding electrode or the second welding electrode, so as to adjust the position of the first welding electrode or the second welding electrode.

[0011] Preferably, the above solution further comprises a displacement sensor provided on the support plate for monitoring the distance between the two support plates in the first horizontal direction.

[0012] The resistance welding device of the present application has at least the following beneficial effects:

[0013] The resistance welding device of the embodiment of the present application includes a back plate, a support plate, a driving unit, a first welding electrode and a second welding electrode; the first welding contact surface of the first welding electrode includes a first sub-surface, a transition surface and a second sub-surface distributed in the height direction, the first sub-surface can push and heat the first side to be welded of the object to be welded so that it is welded together with the second side to be welded, the second sub-surface can push and heat the first side to be welded so that it is welded together with the copper wire, because the first sub-surface is a vertical surface, its contact area with the first side to be welded is larger, the first side to be welded and the second side to be welded can have a larger weld area, and the welding effect is more reliable, the second sub-surface is also designed as a vertical surface, the penetration value of the two copper wires to be welded after welding can be consistent, the welding effect and consistency are good, and the predetermined distance between the first sub-surface and the second sub-surface can be designed according to different needs to control the penetration value of the copper wire. The resistance welding device of the embodiment of the present application is not only reliable in welding, but also suitable for welding of double copper wires. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0015] Figure 1 is a schematic diagram of the structure of the terminal in the embodiment of the present application;

[0016] Figure 2 It is a schematic diagram of welding terminals and copper wires in the prior art;

[0017] Figure 3 is a front view of a resistance welding device in an embodiment of the present application;

[0018] Figure 4 yes Figure 3 Side view of

[0019] Figure 5 is a front view of a mounting base, a first welding electrode, and a second welding electrode;

[0020] Figure 6 yes Figure 3 The enlarged schematic diagram of point A in the middle;

[0021] Figure 7 is a schematic diagram of the partial structure of the first welding electrode and the second welding electrode;

[0022] Figure 8 is a schematic diagram of a terminal and a copper wire welded together in an embodiment of the present application;

[0023] Fig. 9 yes Figure 4 The enlarged schematic diagram of point B in the middle;

[0024] Fig.10 It is a top view of the terminal;

[0025] Fig.11 is a schematic diagram of other embodiments after the terminal and the copper wire are welded together;

[0026] Description of the reference numerals is as follows:

[0027] 1. Back panel;

[0028] 2. Support plate;

[0029] 3. Drive unit;

[0030] 4. first welding electrode; 41. first welding contact surface; 411. first sub-surface; 412. transition surface; 4121. first arc surface; 4122. second arc surface; 413. second sub-surface;

[0031] 5. a second welding electrode; 51. a second welding contact surface;

[0032] 6. Displacement sensor;

[0033] 7. Mounting seat; 71. Slide groove; 72. Pressing plate; 73. Adjusting bolt.

[0034] 8. Terminal; 81. First edge to be welded; 81a. L-shaped right angle portion; 82. Second edge to be welded;

[0035] 9. Copper wire;

[0036] 10. The first electrode of the prior art;

[0037] 11. The second electrode of the prior art. DETAILED DESCRIPTION

[0038] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0040] First, some problems in the technical field are explained. After the brushless stator is wound, the end of the copper wire 9 needs to be welded to the terminal 8, and the terminal 8 is fixed to the stator in advance.

[0041] like Figure 1 As shown, the terminal 8 is provided with a first edge to be welded 81 and a second edge to be welded 82 , a receiving groove is formed between the first edge to be welded 81 and the second edge to be welded 82 , and the copper wire 9 to be welded is arranged in the receiving groove.

[0042] like Figure 2 As shown, Figure 2 The welding structure in the prior art is shown in FIG. Figure 2(a) shows the figure before welding. Figure 2 (b) in FIG. 1 shows the welding process, wherein arrow F1 shows the moving direction of the electrode in the prior art, and P1 and P2 both represent the weld. Figure 2 It can be seen that the welding contact surface of the first electrode 10 of the prior art is an inclined surface, which will cause the following problems: 1. The welding penetration value of the copper wire 9 is difficult to control; 2. The connecting part (as shown in P1, i.e., the weld) after the first edge 81 to be welded and the second edge 82 to be welded is small in area, and the welding is not strong enough; 3. If double copper wires 9 are to be welded (that is, there are two upper and lower copper wires in the accommodating groove), the lower copper wire 9 may not be welded or the welding penetration value may not meet the standard. Even if it can meet the standard, it can only be achieved after sacrificing the penetration of the upper copper wire 9; 4. Since the welding contact surface of the first electrode 10 is an inclined surface, the welding penetration values ​​of the upper and lower copper wires 9 are inconsistent when double wires are welded.

[0043] like Figure 3 and Figure 4 As shown, the embodiment of the present application discloses a resistance welding device, including a back plate 1, a support plate 2, a driving unit 3, a first welding electrode 4 and a second welding electrode 5;

[0044] The back plate 1 is a rectangular flat plate, and the back plate 1 is arranged on an external structure, and the external structure can drive the back plate 1 to move in the height direction. In the embodiment of the present application, the back plate 1 is arranged on a slide rail structure, and the slide rail structure can drive the back plate 1 to move in the height direction.

[0045] There are two support plates 2 , and both support plates 2 are slidably arranged on the surface of the back plate 1 via guide rails. The two support plates 2 can be relatively close to each other or relatively far away from each other in the first horizontal direction.

[0046] The driving unit 3 is used to drive the two support plates 2 to be relatively far apart or relatively close in the first horizontal direction. The driving unit 3 can refer to existing driving components such as servo electric cylinders, telescopic push rods, and telescopic cylinders. In the embodiment of the present application, the driving unit 3 is arranged on one support plate 2, and the output end of the driving unit 3 is connected to the other support plate 2, and the telescopic direction of the driving unit 3 is configured as the first horizontal direction.

[0047] like Figure 3 As shown, the first welding electrode 4 and the second welding electrode 5 are respectively arranged on the two support plates 2 in a one-to-one correspondence.

[0048] In some preferred embodiments, Figure 5As shown, both support plates 2 are provided with mounting seats 7, which can provide mounting positions for the first welding electrode 4 and the second welding electrode 5. The mounting seats 7 are provided with a slide groove 71, and a part of the first welding electrode 4 or a part of the second welding electrode 5 is inserted into the slide groove 71. The mounting seats 7 are also provided with a pressing plate 72 ( Figure 5 Only one pressing plate is shown in the figure, and the pressing plate 72 is connected to the mounting seat 7 by screws or other threaded parts. When the screws are tightened, the pressing plate 72 can fit against the first welding electrode 4 or the second welding electrode 5, thereby stabilizing the first welding electrode 4 or the second welding electrode 5 in the slide groove 71. The mounting seat 7 is also threadedly connected with an adjusting bolt 73, and the end of the adjusting bolt 73 can be against the top surface of the first welding electrode 4 or the second welding electrode 5. The adjusting bolt 73 is used to adjust the position of the first welding electrode 4 or the second welding electrode 5 in the slide groove 71.

[0049] When the position of the first welding electrode 4 or the second welding electrode 5 needs to be adjusted, the pressing plate 72 only needs to be slightly loosened, and then the adjusting bolt 73 is turned to push the electrode out of the slide slot 71 .

[0050] For some preferred solutions, please refer again Figure 3 The resistance welding device also includes a displacement sensor 6, which is arranged on a support plate 2. The displacement sensor 6 can monitor the distance between the two support plates 2 in the first horizontal direction, thereby facilitating the control of the welding penetration value.

[0051] The first welding electrode 4 and the second welding electrode 5 are both connected to an external power source (not shown) (the power source is connected for electrical heating to achieve welding).

[0052] like Figure 6 As shown, along the first horizontal direction, one side of the first welding electrode 4 facing the second welding electrode 5 is configured as a first welding contact surface 41, and one side of the second welding electrode 5 facing the first welding electrode 4 is configured as a second welding contact surface 51. A clamping space for clamping the object to be welded (i.e., the terminal 8) is formed between the first welding contact surface 41 and the second welding contact surface 51. When the two support plates 2 move relative to each other, the support plate 2 can drive the first welding electrode 4 and the second welding electrode 5 to change the size of the clamping space.

[0053] In some preferred embodiments, Figure 6 As shown, the length L1 of the first welding contact surface 41 is equal to the length L2 of the second welding contact surface 51. The first welding contact surface 41 and the second welding contact surface 51 can be made to form a corresponding relationship, which is convenient for clamping and welding the terminal 8 and the copper wire 9.

[0054] Figure 7 (a) shows a partial structural schematic diagram of the first welding electrode 4; Figure 7(b) shows a partial structural schematic diagram of the second welding electrode 5, which is as follows:

[0055] The first welding contact surface 41 includes a first sub-surface 411, a transition surface 412, and a second sub-surface 413 distributed along the height direction. The first sub-surface 411 and the second sub-surface 413 are both configured as vertical surfaces and are parallel to the second welding contact surface 51. In the embodiment of the present application, the first sub-surface 411 and the second sub-surface 413 are both arranged opposite to the second welding contact surface 51.

[0056] like Figure 6 As shown, there is a predetermined distance H1 between the first sub-surface 411 and the second sub-surface 413 in the first horizontal direction, and the size of the predetermined distance H1 can be designed according to actual conditions.

[0057] like Figure 7 As shown, the first sub-surface 411 is located above the second sub-surface 413 , and along the first horizontal direction, the first sub-surface 411 is located on a side of the second sub-surface 413 close to the second welding contact surface 51 .

[0058] In the embodiment of the present application, the first sub-surface 411 can push the first edge to be welded 81 to fit onto the second edge to be welded 82, and then because the first welding electrode 4 and the second welding electrode 5 are externally connected to a power source, the first edge to be welded 81 is heated and welded together with the second edge to be welded 82, wherein, because the first sub-surface 411 is a vertical surface, the first sub-surface 411 and the first edge to be welded 81 can fit in contact, which will increase the heated area of ​​the first edge to be welded 81, thereby making the first edge to be welded 81 and the second edge to be welded 82 have a larger connection area.

[0059] In the present application embodiment, Figure 8 As shown, the second sub-surface 413 can heat the first edge to be welded 81, so that the first edge to be welded 81 and the copper wire 9 are welded together, and because the second sub-surface 413 is a vertical surface, the two copper wires 9 on the terminal 8 can maintain a consistent welding depth value, that is, the device of the embodiment of the present application can be applied to the welding condition of two copper wires 9. It should be noted that if the welding depth value needs to be controlled, it is only necessary to replace the first welding electrode 4 with a different predetermined distance H1.

[0060] In some preferred embodiments, Fig. 9 and Fig.10 As shown, the thickness of the first welding electrode 4 in the second horizontal direction is defined as D1; ​​the thickness of the second welding electrode 5 in the second horizontal direction is defined as D2; the thickness of the first side 81 to be welded of the object to be welded (i.e., the terminal 8) in the second horizontal direction is defined as D3; the thickness of the second side 82 to be welded of the object to be welded in the second horizontal direction is defined as D4; D1 is equal to D3, and D2 is equal to D4. The first horizontal direction and the second horizontal direction intersect vertically in the horizontal plane.

[0061] In the embodiment of the present application, the thickness of the first welding electrode 4 and the second welding electrode 5 are designed to be equal to the first edge 81 to be welded and the second edge 82 to be welded of the terminal 8, respectively. This can fully heat the terminal 8 so that the two edges to be welded of the terminal 8 can be welded together. At the same time, the contact area between the electrode and the edge to be welded can be increased to ensure the welding effect.

[0062] For some preferred solutions, please refer again Figure 7 , along the height direction, the transition surface 412 is arranged between the first sub-surface 411 and the second sub-surface 413, and the transition surface 412 includes a first arc surface 4121 and a second arc surface 4122 connected up and down, the upper end of the first arc surface 4121 is smoothly connected to the first sub-surface 411, the lower end of the first arc surface 4121 is smoothly connected to the upper end of the second arc surface 4122, and the lower end of the second arc surface 4122 is smoothly connected to the upper end of the second sub-surface 413; wherein, the first arc surface 4121 is an outward convex arc, and the second arc surface 4122 is an inward concave arc, specifically, with the second welding contact surface 51 as a reference, the first arc surface 4121 is convex relative to the second welding contact surface 51, and the second arc surface 4122 is concave relative to the second welding contact surface 51.

[0063] In the embodiment of the present application, the transition surface 412 is designed as an arc surface, which can ensure the aesthetics after welding. From another perspective, assuming that the embodiment of the present application does not use an arc transition, but a right-angle step surface transition, then after welding, an L-shaped right-angle portion 81a will be formed. Fig.11 As shown, the L-shaped right angle portion 81a is prone to defects such as breakage.

[0064] In some preferred schemes, the first welding electrode 4 and the second welding electrode 5 are both made of tungsten steel, which has better welding durability and can reduce the frequency of replacing electrodes in the production line, thereby improving efficiency.

[0065] A working method of the resistance welding device in the embodiment of the present application is as follows:

[0066] The back plate 1 drives the whole structure to move downward to a certain position, so that the terminal 8 and the copper wire 9 to be welded are located between the first welding electrode 4 and the second welding electrode 5;

[0067] The driving unit 3 drives the two support plates 2 to be relatively close to each other along the first horizontal direction, and the two first welding electrodes 4 and the second welding electrodes 5 are respectively in contact with the first to-be-welded edge 81 and the second to-be-welded edge 82 of the terminal 8, and the first welding electrode 4 and the second welding electrode 5 are energized at the same time;

[0068] The first edge to be welded 81 and the second edge to be welded 82 are welded together after being heated, and at the same time, the first edge to be welded 81 and the copper wire 9 are also welded together. Figure 8 shown.

[0069] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A resistance welding device, characterized in that: It comprises a back plate (1), a support plate (2), A driving unit (3), a first welding electrode (4) and a second welding electrode (5); The back plate (1) is arranged on the external structure, and the back plate (1) can move in the height direction; The two support plates (2) are both slidably arranged on the back plate (1), and the two support plates (2) can slide relatively in a first horizontal direction; the driving unit (3) is respectively connected to the two support plates (2) and is used to drive the two support plates (2) to move relatively closer or farther in the first horizontal direction; The first welding electrode (4) and the second welding electrode (5) are respectively arranged on two support plates (2); A side surface of the first welding electrode (4) facing the second welding electrode (5) is configured as a first welding contact surface (41), the first welding contact surface (41) comprising a first sub-surface (411), a transition surface (412) and a second sub-surface (413) distributed along a height direction, the first sub-surface (411) and the second sub-surface (413) are both vertical surfaces, and there is a predetermined distance H1 between the first sub-surface (411) and the second sub-surface (413) in a first horizontal direction; A side surface of the second welding electrode (5) facing the first welding electrode (4) is configured as a second welding contact surface (51), and a clamping space for clamping an object to be welded is formed between the first welding contact surface (41) and the second welding contact surface (51).

2. The resistance welding device according to claim 1, characterized in that: The first welding contact surface (41) and the second welding contact surface (51) are arranged opposite to each other in a first horizontal direction, and a length L1 of the first welding contact surface (41) and a length L2 of the second welding contact surface (51) are equal.

3. The resistance welding device according to claim 1 or 2, characterized in that: The transition surface (412) includes a first curved surface (4121) and a second curved surface (4122), wherein the first curved surface One end of (4121) is connected to the first sub-surface (411), and the other end is connected to one end of the second arc surface (4122), and the other end of the second arc surface (4122) is connected to the second sub-surface (413); the first arc surface (4121) is convex relative to the second welding contact surface (51), and the second arc surface (4122) is concave relative to the second welding contact surface (51).

4. The resistance welding device according to any one of claims 1 to 3, characterized in that: The thickness of the first welding electrode (4) in the second horizontal direction is defined as D1; ​​the thickness of the second welding electrode (5) in the second horizontal direction is defined as D2; the thickness of the first edge (81) of the object to be welded in the second horizontal direction is defined as D3; the thickness of the second edge (82) of the object to be welded in the second horizontal direction is defined as D4; D1 is equal to D3, and D2 is equal to D4.

5. The resistance welding device according to claim 1, characterized in that: The first welding electrode (4) and the second welding electrode (5) are both made of tungsten steel.

6. The resistance welding device according to claim 1, characterized in that: The first welding electrode (4) and the second welding electrode (5) are both arranged on the support plate (2) via a mounting seat (7); a slide groove (71) is arranged on the mounting seat (7); at least part of the first welding electrode (4) or the second welding electrode (5) is arranged in the slide groove (71); a pressing plate (72) and an adjusting bolt (73) are arranged on the mounting seat (7); the pressing plate (72) is used to press the first welding electrode (4) or the second welding electrode (5) in the slide groove (71); the adjusting bolt (73) is threadedly connected to the mounting seat (7); and the adjusting bolt (73) abuts against the first welding electrode (4) or the second welding electrode (5) to adjust the position of the first welding electrode (4) or the second welding electrode (5).

7. The resistance welding device according to claim 1, characterized in that: It also includes a displacement sensor (6) arranged on the support plate (2) for monitoring the distance between the two support plates (2) in the first horizontal direction.

Images