Electric resistance welding device

Abstract

The invention belongs to the technical field of electric resistance welding, and discloses an electric resistance welding device. The electric resistance welding device comprises a first electrode, a second electrode and an elastic piece. The second electrode and the first electrode are mutually insulated, the first electrode comprises an inner electrode, the second electrode comprises an outer electrode, the outer electrode is coaxially and slidably sleeved outside the inner electrode, one end of the inner electrode is provided with a first pressure welding part, one end of the outer electrode is provided with a second pressure welding part, and the first pressure welding part and the second pressure welding part are located at the same end in the axis direction. The first electrode is further connected with the second electrode through an elastic piece, and when the first pressure welding part abuts against the first welding piece in a pressing mode, the first electrode pushes the second electrode in the same direction through the elastic piece so that the second pressure welding part can abut against the second welding piece in a pressing mode. The outer electrode is coaxially sleeved outside the inner electrode, the structure is compact, radial and axial spaces are saved, and the outer electrode and a welding structural member can be conveniently positioned through mutual flexible connection of the elastic member.

Description

Technical Field

[0001] The invention relates to the technical field of resistance welding, and in particular to a resistance welding device. Background Art

[0002] Resistance welding refers to a method of using the resistance heat generated by the current passing through the weldment and the contact point as a heat source to locally heat the weldment and pressurize it for welding. During welding, no filler metal is required, the productivity is high, the weldment deformation is small, and it is easy to realize automation. At present, resistance welding generally uses two independent welding electrodes. When in use, the two welding electrodes squeeze the two crossed metals respectively and release current for welding.

[0003] However, the two electrodes are independent of each other. On the one hand, they take up a large space, which is not conducive to operation in narrow scenes; on the other hand, they must be moved synchronously when in use, which is not convenient for positioning and adjustment; moreover, this design structure requires longer wires to connect the two electrodes to the two poles of the welding transformer, which has the problems of high cost and serious current loss during transmission, and is less environmentally friendly and economical. Summary of the invention

[0004] The object of the present invention is to provide a resistance welding device with a compact structure, saving space, facilitating the positioning and adjustment between two electrodes, and reducing welding current loss.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A resistance welding device is used to weld a first welding piece and a second welding piece together, and the resistance welding device comprises:

[0007] a first electrode and a second electrode, the second electrode and the first electrode being insulated from each other, the first electrode comprising an inner electrode, the second electrode comprising an outer electrode, the outer electrode being coaxial and slidably sleeved outside the inner electrode, one end of the inner electrode comprising a first pressure welding portion, one end of the outer electrode comprising a second pressure welding portion, the first pressure welding portion and the second pressure welding portion being located at the same end in the axial direction;

[0008] The first electrode is also connected to the second electrode through the elastic member. When the first pressure welding portion is pressed against the first welding member, the first electrode pushes the second electrode in the same direction through the elastic member so that the second pressure welding portion is pressed against the second welding member.

[0009] Optionally, the resistance welding device further comprises a first insulating sleeve, wherein the first insulating sleeve is located between the inner electrode and the outer electrode, one of the inner electrode and the outer electrode is relatively fixed to the first insulating sleeve, and the other is slidably matched with the first insulating sleeve.

[0010] Optionally, the first insulating sleeve is sleeved and fixed outside the inner electrode, the outer electrode is slidably sleeved on the first insulating sleeve, and the second electrode also includes a first limiting portion arranged on the outer electrode, and under the action of the elastic member, the first limiting portion can be tightly pressed against an end face of the first insulating sleeve away from the first pressure welding portion.

[0011] Optionally, the first electrode further includes a boss, which is arranged at an end of the inner electrode away from the first pressure welding portion, and the elastic member is sleeved on the inner electrode, with one end of the elastic member pressed against the boss and the other end pressed against an end of the second electrode away from the second pressure welding portion.

[0012] Optionally, the resistance welding device further includes a second insulating sleeve and an insulating ring, wherein the second insulating sleeve is located between the elastic member and the inner electrode, the insulating ring is sandwiched between the elastic member and the boss and / or the insulating ring is sandwiched between the elastic member and the second electrode.

[0013] Optionally, the resistance welding device further includes a pushing mechanism, the boss is disposed on the pushing mechanism and is insulated from the pushing mechanism, and the pushing mechanism pushes the first electrode along the axial direction of the inner electrode.

[0014] Optionally, one end of the outer electrode further has a clearance notch, the clearance notch and the second pressure welding portion are distributed along the circumferential direction, the clearance notch accommodates the first welding part, and is insulated from the first welding part.

[0015] Optionally, the clearance notch includes a first notch and a second notch opposite to each other along a first radial direction, the second pressure-welding portion includes a first positioning groove and a second positioning groove opposite to each other along a second radial direction, and the first radial direction and the second radial direction intersect at an axis.

[0016] Optionally, the resistance welding device further includes a welding transformer, and the first electrode and the second electrode are conductively connected to the welding transformer respectively.

[0017] Optionally, the first electrode further includes a pressure welding head, which is detachably disposed at one end of the inner electrode, and has the first pressure welding portion.

[0018] Beneficial effects of the present invention:

[0019] The resistance welding device provided by the present invention has an outer electrode coaxially sleeved outside the inner electrode to achieve coaxial integration and save radial space; moreover, the coaxial setting makes the focusing area of ​​the first pressure welding part and the second pressure welding part concentrated, which is conducive to aligning with the intersection position of the first welding part and the second welding part, and reducing the current loss at the contact. The same end of the outer electrode and the inner electrode respectively has a first pressure welding part and a second pressure welding part. When the first pressure welding part is pressed against the first welding part, the first electrode pushes the second electrode in the same direction through the elastic part so that the second pressure welding part is pressed against the second welding part. The inner electrode and the outer electrode are on the same side of the welding structure, and are in contact with the first welding part and the second welding part respectively, saving axial space; the compact inner electrode and the outer electrode are convenient for shortening the connecting wire with the welding transformer and reducing circuit loss; the inner electrode and the outer electrode are slidably sleeved and guided to each other, and the inner electrode and the outer electrode also interact with each other through the elastic part. After one is relatively positioned with the first welding part, the other is constrained by the elastic part to automatically position with the second condition part, which is convenient for positioning and adjustment, and adapts to first welding parts and second welding parts of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an axonometric diagram of a resistance welding device provided by an embodiment of the present invention;

[0021] Figure 2 It is a cross-sectional view of a resistance welding device provided by an embodiment of the present invention.

[0022] In the figure:

[0023] 1. First welding part; 2. Second welding part;

[0024] 100, first electrode; 101, inner electrode; 102, boss; 103, first wire; 104, pressure welding head; 105, first pressure welding part;

[0025] 200, second electrode; 210, external electrode; 220, first limiting portion; 230, second pressure welding portion; 231, first positioning groove; 232, second positioning groove; 240, clearance gap; 241, first gap; 242, second gap; 250, connecting block; 260, second wire;

[0026] 300, elastic member;

[0027] 401, first insulating sleeve; 402, second insulating sleeve; 403, insulating ring; 404, third insulating sleeve;

[0028] 500, promoting institutions;

[0029] 600. Support members. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] like Figure 1 and Figure 2 As shown, this embodiment provides a resistance welding device for welding a first welding member 1 and a second welding member 2. The resistance welding device includes a first electrode 100, a second electrode 200 and an elastic member 300.

[0035] like Figure 1 and Figure 2As shown, the second electrode 200 is insulated from the first electrode 100. The first electrode 100 includes an inner electrode 101, and the second electrode 200 includes an outer electrode 210. The outer electrode 210 is coaxial and slidably sleeved outside the inner electrode 101. One end of the inner electrode 101 has a first pressure welding portion 105, and one end of the outer electrode 210 has a second pressure welding portion 230. The first pressure welding portion 105 and the second pressure welding portion 230 are located at the same end in the axial direction. The first electrode 100 is also connected to the second electrode 200 through an elastic member 300. When the first pressure welding portion 105 is pressed against the first welding member 1, the first electrode 100 pushes the second electrode 200 in the same direction through the elastic member 300, so that the second pressure welding portion 230 is pressed against the second welding member 2.

[0036] In the resistance welding device provided in this embodiment, the outer electrode 210 is coaxially sleeved outside the inner electrode 101 to achieve coaxial integration and save radial space; moreover, the coaxial setting concentrates the focusing areas of the first pressure welding part 105 and the second pressure welding part 230, which is conducive to alignment with the intersection position of the first welding part 1 and the second welding part 2, thereby reducing current loss at the contact point. The same end of the outer electrode 210 and the inner electrode 101 has a first pressure welding portion 105 and a second pressure welding portion 230 respectively. When the first pressure welding portion 105 is pressed against the first welding part 1, the first electrode 100 pushes the second electrode 200 in the same direction through the elastic member 300, so that the second pressure welding portion 230 is pressed against the second welding part 2. The inner electrode 101 and the outer electrode 210 are on the same side of the welding structure, respectively contacting the first welding part 1 and the second welding part 2, saving axial space; the compact structure of the inner electrode 101 and the outer electrode 210 is convenient for shortening the connecting wire with the welding transformer and reducing circuit loss; the inner electrode 101 and the outer electrode 210 are slidably sleeved and guided to each other, and the inner electrode 101 and the outer electrode 210 also interact with each other through the elastic member 300. After one is relatively positioned with the first welding part 1, the other is constrained by the elastic member 300 to automatically position with the second condition part, which is convenient for positioning and adjustment, and can adapt to first welding parts 1 and second welding parts 2 of different sizes.

[0037] To achieve mutual insulation between the inner electrode 101 and the outer electrode 210, as Figure 2 As shown, optionally, the resistance welding device further includes a first insulating sleeve 401. The first insulating sleeve 401 is located between the inner electrode 101 and the outer electrode 210, one of the inner electrode 101 and the outer electrode 210 is relatively fixed to the first insulating sleeve 401, and the other is slidably matched with the first insulating sleeve 401. The first insulating sleeve 401 can be a rubber sleeve or a polymer material sleeve.

[0038] Optionally, the first insulating sleeve 401 is sleeved and fixed outside the inner electrode 101, the outer electrode 210 is slidably sleeved on the first insulating sleeve 401, and the second electrode 200 further includes a first limiting portion 220 provided on the outer electrode 210. Under the action of the elastic member 300, the first limiting portion 220 can be pressed against the end face of the first insulating sleeve 401 away from the first pressure welding portion 105. The first limiting portion 220 is pressed against the end face of the first insulating sleeve 401 to limit the movement stroke of the outer electrode 210 compared with the inner electrode 101, so as to prevent the outer electrode 210 from slipping off the inner electrode 101 under the action of the elastic member 300, and can move in the reverse direction for a certain stroke under the reverse pressure of the welding structure. The first insulating sleeve 401 can be fixed on the inner electrode 101 by means of threaded connection, bonding or clamping. In this embodiment, the first limiting portion 220 is a step structure.

[0039] Optionally, the first electrode 100 further includes a boss 102, which is disposed at one end of the inner electrode 101 away from the first pressure welding portion 105, and the elastic member 300 is sleeved on the inner electrode 101, one end of the elastic member 300 is pressed against the boss 102, and the other end is pressed against one end of the second electrode 200 away from the second pressure welding portion 230. The elastic member 300 is sleeved outside the inner electrode 101, and has a compact structure. When the inner electrode 101 moves toward the first pressure welding portion 105, the boss 102 fixedly connected to the inner electrode 101 pushes the outer electrode 210 in the same direction through the elastic member 300. Relative to the first welding member 1 and the second welding member 2, the elastic member 300 adaptively adjusts the relative position of the inner electrode 101 and the outer electrode 210, and while pressing in the same direction, it also adapts to the size of the first welding member 1 and the second welding member 2. In this embodiment, the elastic member 300 may be a coil spring.

[0040] Optionally, the resistance welding device further includes a second insulating sleeve 402 and an insulating ring 403, the second insulating sleeve 402 is located between the elastic member 300 and the inner electrode 101, the insulating ring 403 is sandwiched between the elastic member 300 and the boss 102, and / or, the insulating ring 403 is sandwiched between the elastic member 300 and the second electrode 200. In one embodiment, the elastic member 300 is insulated from the inner electrode 101 by the second insulating sleeve 402, and is also insulated from the boss 102 by the insulating ring 403, thereby ensuring insulation between the second electrode 200 and the first electrode 100. In another embodiment, the elastic member 300 is insulated from the inner electrode 101 by the second insulating sleeve 402, and is also insulated from the second electrode 200 by the insulating ring 403, which also prevents the elastic member 300 from causing conduction between the second electrode 200 and the first electrode 100.

[0041] Optionally, the resistance welding device further includes a pushing mechanism 500, the boss 102 is disposed on the pushing mechanism 500 and is insulated from the pushing mechanism 500, and the pushing mechanism 500 pushes the first electrode 100 along the axial direction of the inner electrode 101. The pushing mechanism 500 drives the first electrode 100 to move, and the second electrode 200 drives the second electrode 200 to move in the same direction through the elastic member 300, and the inner electrode 101 is pressed against the first welding member 1, and the second electrode 200 is pressed against the second welding member 2.

[0042] The pushing mechanism 500 cooperates with the elastic member 300 to realize the same-direction driving of the inner electrode 101 and the outer electrode 210, and there is no need to provide two independent sets of driving members for the inner electrode 101 and the outer electrode 210. Specifically, the pushing mechanism 500 makes the inner electrode 101 press against the first welding member 1, and the elastic member 300 makes the outer electrode 210 press against the second welding member 2, ensuring that the inner electrode 101 and the outer electrode 210 are in close contact with both welding members, respectively. At the same time, the elastic member 300 realizes the pushing of the second electrode 200, and there is no need to set up a second driving mechanism for the second electrode 200, which saves space occupation, and the elastic member 300 can adaptively adjust the position between the second electrode 200 and the inner electrode 101 to meet the needs of the first welding member 1 and the second welding member 2 of different sizes.

[0043] The driving mechanism 500 has no limitation on the type of power, and can be powered by pneumatic, hydraulic, electric, electromagnetic, or other power elements. In this embodiment, the driving mechanism 500 is a cylinder. A third insulating sleeve 404 is sandwiched between the driving mechanism 500 and the boss 102 to ensure insulation between the second electrode 200 and the driving mechanism 500.

[0044] Optionally, a support member 600 is provided, and the first welding member 1 and the second welding member 2 are located between the support member 600 and the two electrodes. The first welding member 1 and the second welding member 2 can be supported by the support member 600, and the support member 600 must also withstand the pressure of the pushing mechanism 500. The support member 600 can be an independent support block, or it can be set as an integral load-bearing platform. This embodiment completely abandons the original welding electrode setting method, and only uses the support member 600 to support the first welding member 1 and the second welding member 2, and no electrodes are arranged on this side of the support member 600.

[0045] like Figure 1 and Figure 2As shown, optionally, one end of the outer electrode 210 further has a clearance notch 240, and the clearance notch 240 and the second pressure welding part 230 are distributed along the circumferential direction. The clearance notch 240 accommodates the first welding part 1 and is insulated from the first welding part 1. During welding preparation, the first welding part 1 and the second welding part 2 are stacked and crossed, and the clearance notch 240 is arranged to avoid the first welding part 1, so that the second pressure welding part 230 passes through the first welding part 1 from the same side and presses against the second welding part 2. The clearance notch 240 maintains non-conductive contact between the outer electrode 210 and the first welding part 1 to avoid short circuit. In this embodiment, the clearance notch 240 maintains a distance from the first welding part 1 to form insulation.

[0046] like Figure 2 As shown, optionally, the clearance notch 240 includes a first notch 241 and a second notch 242 opposite to each other along a first radial direction, and the second pressure welding portion 230 includes a first positioning groove 231 and a second positioning groove 232 opposite to each other along a second radial direction, and the first radial direction and the second radial direction intersect at an angle. The first notch 241 and the second notch 242 avoid and insulate the linear first welding part 1, and the first positioning groove 231 and the second positioning groove 232 press and limit the linear second welding part 2, so as to weld the intersection of the crossed first welding part 1 and the second welding part 2, and the welding points are concentrated at the intersection, and the current is concentrated. At the intersection of the welded structural parts, the contact point is the smallest, the resistance is the largest, and heat is generated. Under the extrusion effect, a welding effect is formed. In this embodiment, the first radial direction and the second radial direction intersect at the axis, and the pressure welding head 104 is located at the axis, which is conducive to force balance.

[0047] The angle between the first radial direction and the second radial direction is determined according to the angle between the first welding part 1 and the second welding part 2. Exemplarily, when the first welding part 1 and the second welding part 2 are perpendicular, the first radial direction and the second radial direction are perpendicular. The size of the first notch 241 and the second notch 242 is determined according to the diameter of the first welding part 1, ensuring that the inner electrode 101 is in full contact with the first welding part 1, while the outer electrode 210 is not in contact with the first welding part 1 through the clearance notch 240, and a sufficient spacing is left.

[0048] Optionally, the resistance welding device further includes a welding transformer, and the first electrode 100 and the second electrode 200 are respectively conductively connected to the welding transformer. Specifically, the first electrode 100 is connected to the welding transformer through the first wire 103, and the second electrode 200 is connected to the welding transformer through the second wire 260. When the welding transformer performs welding and releases current, the current passes through the first wire 103, the inner electrode 101, the first welding part 1, the second welding part 2, the outer electrode 210, and the second wire 260.

[0049] like Figure 2As shown, optionally, the first electrode 100 further includes a pressure welding head 104, which is detachably arranged at one end of the inner electrode 101, and has a first pressure welding portion 105. The pressure welding head 104 can be detached, which is convenient for maintenance and replacement, and saves costs. The connection method between the pressure welding head 104 and the inner electrode 101 can be a threaded connection, a bayonet connection, etc., which is not limited here.

[0050] In the working process of the resistance welding device provided in this embodiment, the pushing mechanism 500 drives the first electrode 100 to move in the direction of the welding structure, and at the same time drives the second electrode 200 to move in the same direction through the elastic member 300, until the second pressure welding portion 230 is first pressed on the second welding member 2, and at the same time, the second electrode 200 continues to press down until the first welding member 1 and the second welding member 2 are completely pressed on the support member 600. At this time, the welding transformer releases the welding current, and the welding current passes through the first wire 103, the second wire 260, the first electrode 100 and the second electrode 200, generating high temperature at the contact point between the first welding member 1 and the second welding member 2, and they are welded together under the continuous pressure of the pushing mechanism 500.

[0051] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Resistance welding device, characterized in that, Used to weld a first welding piece (1) and a second welding piece (2) together to form a welded structural piece, the resistance welding device comprising: A first electrode (100) and a second electrode (200), wherein the second electrode (200) and the first electrode (100) are insulated from each other, the first electrode (100) comprises an inner electrode (101), the second electrode (200) comprises an outer electrode (210), the outer electrode (210) is coaxially and slidably sleeved outside the inner electrode (101), one end of the inner electrode (101) comprises a first pressure welding portion (105), and one end of the outer electrode (210) comprises a second pressure welding portion (230), and the first pressure welding portion (105) and the second pressure welding portion (230) are located at the same end in the axial direction; The first electrode (100) is also connected to the second electrode (200) through the elastic member (300); when the first pressure welding portion (105) is pressed against the first welding member (1), the first electrode (100) pushes the second electrode (200) in the same direction through the elastic member (300) so that the second pressure welding portion (230) is pressed against the second welding member (2).

2. The resistance welding device according to claim 1, characterized in that: The resistance welding device further comprises a first insulating sleeve (401), wherein the first insulating sleeve (401) is located between the inner electrode (101) and the outer electrode (210), and one of the inner electrode (101) and the outer electrode (210) is relatively fixed to the first insulating sleeve (401), and the other is slidably matched with the first insulating sleeve (401).

3. The resistance welding device according to claim 2, characterized in that: The first insulating sleeve (401) is sleeved and fixed on the outside of the inner electrode (101), and the outer electrode (210) is slidably sleeved on the first insulating sleeve (401). The second electrode (200) also includes a first limiting portion (220) arranged on the outer electrode (210). Under the action of the elastic member (300), the first limiting portion (220) can be tightly pressed against an end surface of the first insulating sleeve (401) away from the first pressure welding portion (105).

4. The resistance welding device according to claim 1, characterized in that: The first electrode (100) further comprises a boss (102), wherein the boss (102) is arranged at an end of the inner electrode (101) away from the first pressure welding portion (105), and the elastic member (300) is sleeved on the inner electrode (101), and one end of the elastic member (300) is pressed against the boss (102), and the other end is pressed against an end of the second electrode (200) away from the second pressure welding portion (230).

5. The resistance welding device according to claim 4, characterized in that: The resistance welding device further comprises a second insulating sleeve (402) and an insulating ring (403), wherein the second insulating sleeve (402) is located between the elastic member (300) and the inner electrode (101), the insulating ring (403) is sandwiched between the elastic member (300) and the boss (102), and / or the insulating ring (403) is sandwiched between the elastic member (300) and the second electrode (200).

6. The resistance welding device according to claim 4, characterized in that: The resistance welding device further comprises a pushing mechanism (500), the boss (102) is arranged on the pushing mechanism (500) and is insulated from the pushing mechanism (500), and the pushing mechanism (500) pushes the first electrode (100) along the axial direction of the inner electrode (101).

7. The resistance welding device according to claim 1, characterized in that: One end of the outer electrode (210) further comprises a clearance notch (240), the clearance notch (240) and the second pressure welding portion (230) are distributed along the circumferential direction, the clearance notch (240) accommodates the first welding part (1) and is insulated from the first welding part (1).

8. The resistance welding device according to claim 7, characterized in that: The clearance notch (240) comprises a first notch (241) and a second notch (242) opposite to each other along a first radial direction, the second pressure welding portion (230) comprises a first positioning groove (231) and a second positioning groove (232) opposite to each other along a second radial direction, and the first radial direction and the second radial direction intersect at an angle.

9. The resistance welding device according to any one of claims 1 to 8, characterized in that: The resistance welding device also includes a welding transformer, and the first electrode (100) and the second electrode (200) are respectively conductively connected to the welding transformer.

10. The resistance welding device according to any one of claims 1 to 8, characterized in that: The first electrode (100) further comprises a pressure welding head (104), wherein the pressure welding head (104) is detachably arranged at one end of the inner electrode (101), and the pressure welding head (104) has the first pressure welding portion (105).

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