Electric resistance welding machine head and electric resistance welding equipment

Abstract

The invention belongs to the technical field of high-speed line welding, and particularly relates to an electric resistance welding machine head and electric resistance welding device.The electric resistance welding machine head comprises a mounting frame, an air cylinder and a displacement sensor which are fixedly connected to one side of the mounting frame, a movable base connected to one side of the mounting frame in a sliding mode and a first welding head fixedly connected to one side of the movable base, and the telescopic end of the air cylinder is connected with one side of the movable base; the air cylinder and the displacement sensor are adopted, the displacement sensor and the air cylinder are high in response speed and are matched with each other to achieve stroke control welding, the welding head is driven to conduct welding in a stroke triggering mode, the welding state is confirmed through the position, and the air cylinder controls displacement and monitors the displacement amount to ensure welding consistency; and the welding precision, the welding stability and the service life of the pressure welding machine head structure are superior to those of a pressure welding machine head structure in the prior art.

Description

Technical Field

[0001] The present application relates to the technical field of high-speed wire welding, in particular to a resistance welding head and a resistance welding device. Background Art

[0002] Resistance welding is a welding method that uses the resistance heat effect generated by the passage of electric current through the contact surface of the weldment and the adjacent area to heat it to a molten or plastic state, thereby forming a metal joint.

[0003] At present, pressure welding is often used in the welding of high-speed wires and terminals. The current pressure welding head (as shown in the figure in the specification) Figure 5 As shown in the figure, it is mainly composed of a pressure spring 14 (providing the load pressure required by the welding head), a pressure sensor 15 (pressure monitoring), an offset spring 16 (offsetting the deadweight of the head), a linear bearing 17, a shaft 18 and a pressure welding head 19. This head mainly confirms the welding state by pressure. The welding force conditions vary greatly, and the welding quality cannot be accurately controlled. In addition, there are the following problems: 1. The pressure sensors currently used in the industry are of low-speed structure. The pressure sensors require calculation conversion and have slow response speeds that cannot meet the data feedback capabilities of high-speed changes. The feedback signal delay causes the change amount after repeated movement to be unable to be accurately measured, and cannot meet the high-speed monitoring feedback requirements. 2. The machine head adopts a spring structure, which has poor follow-up performance during high-speed reciprocating motion. The repeated elastic force accumulation during high-speed reciprocating motion makes it impossible to accurately test the welding pressure value each time; 3. The elastic force of the spring will age and wear out as the number of repeated uses increases. The elastic force of the spring will decay during use, and the spring strength will gradually change. This process must be manually taught and measured; 4. The interval time during rapid repeated use is short, the elastic force is not fully released, the elastic force accumulates, and the accumulated heat affects the elasticity of the spring; 5. The zero point where the upper and lower spring torques are offset belongs to the vacuum state, and the data at this moment cannot be monitored. Summary of the invention

[0004] The purpose of this application is to provide a resistance welding head and a resistance welding device to solve the technical problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a resistance welding head, including a mounting frame, a cylinder and a displacement sensor fixedly connected to one side of the mounting frame, a movable seat slidably connected to one side of the mounting frame, and a welding head fixedly connected to one side of the movable seat, wherein the telescopic end of the cylinder is connected to one side of the movable seat, and the cylinder and the displacement sensor are both connected to a control module.

[0006] Preferably, a cross roller bearing is connected to one side of the movable seat, and the telescopic end of the cylinder is fixedly connected to the inner ring of the cross roller bearing, and the outer ring of the cross roller bearing is fixedly connected to the upper end of the movable seat.

[0007] Preferably, a slide rail is fixedly connected to one side of the mounting frame, and the movable seat is slidably connected to the slide rail.

[0008] Preferably, the cylinder controls the displacement of the moving seat and the welding head and cooperates with the displacement sensor to realize stroke-controlled welding. The displacement is monitored by the displacement sensor to confirm the welding state and ensure the welding consistency.

[0009] In order to achieve the above-mentioned second purpose, the resistance welding equipment provided by the present invention is used to drive a cam assembly for radially moving a resistance welding head, and the resistance welding head adopts the above-mentioned resistance welding head, the cam assembly includes a bracket, a plurality of guide rails fixedly connected to one side of the bracket, a mounting plate slidably connected to the plurality of guide rails, an active groove opened inside the mounting plate, a cam rotatably connected to one side of the bracket, a cylinder rotatably connected to one side of the cam, and a driving part fixed to the other side of the bracket, the cylinder is located in the active groove, the output shaft of the driving part is connected to the cam and drives the cam and the cylinder to rotate, the cylinder rotates in the active groove to drive the mounting plate to move radially on the guide rail, and a resistance welding head is fixed to one side of the mounting plate.

[0010] Compared with the prior art, the beneficial effects of this application are: This application uses a cylinder and a displacement sensor. The displacement sensor and the cylinder have fast responses. The two cooperate with each other to achieve stroke-controlled welding. The welding head is driven to weld by stroke triggering. The displacement is monitored by the displacement sensor to confirm the welding position. The displacement is controlled by the cylinder, and the displacement is monitored to ensure welding consistency. It is superior to the pressure welding head structure in the prior art in terms of welding accuracy, welding stability and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the resistance welding head structure of this application.

[0012] Figure 2 It is a schematic diagram of the structure of resistance welding equipment in the prior art.

[0013] Figure 3 This is a schematic diagram of the resistance welding equipment structure for this application.

[0014] Figure 4 This is a schematic diagram of the drive unit and cam structure of this application.

[0015] Figure 5 It is a schematic diagram of the structure of the pressure welding machine head in the prior art.

[0016] In the figure: 1. mounting frame; 2. cylinder; 3. displacement sensor; 4. cross roller bearing; 5. moving seat; 6. welding head 1; 7. axial moving unit; 8. CCD camera; 9. bracket; 10. guide rail; 11. mounting plate; 12. cam; 121. cylinder; 13. driving unit; 14. pressure spring; 15. pressure sensor; 16. offset spring; 17. linear bearing; 18. shaft; 19. pressure welding head. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0018] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0019] Embodiment 1:

[0020] See also Figure 1 The present application provides a technical solution: a resistance welding head, including a mounting frame 1, a cylinder 2 and a displacement sensor 3 fixedly connected to one side of the mounting frame 1, a moving seat 5 slidably connected to one side of the mounting frame 1, and a welding head 6 fixedly connected to one side of the moving seat 5, the telescopic end of the cylinder 2 is connected to one side of the moving seat 5, and the cylinder 2 and the displacement sensor 3 are both connected to a control module. A slide rail is fixedly connected to one side of the mounting frame 1, and the moving seat 5 is slidably connected to the slide rail. The cylinder 2 (the pressure is controlled by a precise air pressure regulating valve to ensure stable pressure application) can drive the moving seat 5 to move along the slide rail by extension and retraction. The displacement sensor 3 calculates the downward distance of the moving seat 5 at high speed and accurately, and feeds back to the control module (a control board with a processing chip) at the same time. The control module adjusts the extension and retraction stroke of the cylinder 2 according to the distance data returned in real time, accurately controls the displacement distance during welding, drives the welding head 6 to move for welding through stroke triggering, and confirms the welding position by monitoring the displacement through the displacement sensor 3. The two cooperate with each other to realize stroke-controlled welding, and monitor the displacement to ensure welding consistency. The welding accuracy, welding stability and service life are all superior to the pressure welding head structure in the prior art.

[0021] A cross roller bearing 4 is connected to one side of the moving seat 5, and the telescopic end of the cylinder 2 is fixedly connected to the inner ring of the cross roller bearing 4, and the outer ring of the cross roller bearing 4 is fixedly connected to the upper end of the moving seat 5. The cross roller bearing 4 provides a stable support point for the telescopic end of the cylinder 2 through the design of its inner and outer rings. This support function enables the cylinder 2 to maintain linear motion during the telescopic process, avoiding deviation or swing caused by uneven load.

[0022] Resistance welding equipment in the prior art is as follows Figure 2 As shown, the resistance welding equipment in the prior art includes an axial moving unit 7, and a resistance welding head is fixedly connected to the moving end of the axial moving unit 7. Usually, a CCD camera 8 is also provided on the resistance welding head. The existing equipment adjusts the radial position of the resistance welding head through the axial moving unit 7 (Z-axis axial moving unit) and makes the resistance welding head contact with the weldment to achieve welding. However, the axial moving unit 7 has a certain thickness (here according to Figure 2 The thickness refers to the dimension of the axial moving unit 7 in the X-axis direction, that is, the dimension range from the back of the axial moving unit 7 to the front of the axial moving unit 7). In this way, when the back of the axial moving unit 7 is fixedly installed on the frame, the thickness of the axial moving unit 7 plus the thickness of the resistance welding head as a whole will make the entire resistance welding equipment thicker, and the force arm of the welding head 6 will be extended. This will cause the contact area between the welding head 6 and the workpiece to be welded to be unstable when the resistance welding head moves radially. The unstable contact area will cause the occurrence of explosive welding (welding sparks) ( , where I is the current, u is the current, and R is the resistance, , where S is the contact area and L is the length of the conductor. When S becomes smaller, R will become smaller, and I will become larger. When I becomes larger, soldering may occur).

[0023] The above-mentioned problem of welding blasting can be solved by the embodiment 2 of the present application. Figure 3 and Figure 4The present application provides a technical solution: a resistance welding device, including a bracket 9, a plurality of guide rails 10 are fixedly connected to one side of the bracket 9, and a mounting plate 11 is slidably connected to the plurality of guide rails 10, a resistance welding head is fixedly connected to one side of the mounting plate 11, and the resistance welding head adopts the resistance welding head in Example 1, a movable groove is provided inside the mounting plate 11, a cam 12 is rotatably connected to one side of the bracket 9, and a cylinder 121 is rotatably connected to one side of the cam 12, and the cylinder 121 is located in the movable groove, a driving part 13 is fixedly connected to one side of the bracket 9, and the output shaft of the driving part 13 is connected to the cam 12 and drives the cam 12 and the cylinder 121 to rotate, and the rotation of the cylinder 121 in the movable groove drives the mounting plate 11 to move radially on the guide rail 10 The driving part 13 (servo motor) works to drive the cam 12 to rotate, and the rotation of the cam 12 drives the cylinder 121 to rotate. When the cylinder 121 rotates in the movable groove, it will contact the inner wall of the movable groove. When the cam 12 rotates clockwise, the cylinder 121 rotates clockwise in the movable groove and drives the mounting plate 11 to move upward along the guide rail 10. When the cam 12 rotates counterclockwise, the cylinder 121 rotates counterclockwise in the movable groove and drives the mounting plate 11 to move downward along the guide rail 10. The rotation of the cam 12 can drive the entire resistance welding head to move radially above the welding position (the rotation of the cam 12 accurately controls the pressing distance between the welding head 6 and the welding pad to prevent welding sparks and damage to the welding head), and then drives the welding head 6 to move slightly through the cylinder 2 to ensure welding accuracy.

[0024] By adopting the cam assembly in Example 2 of the present application to drive the resistance welding head to move radially, since the cylinder 121 of the cam assembly is located inside the mounting plate 11, it is not necessary to take the cylinder 121 into account when calculating the overall thickness of the cam assembly. The axial moving unit 7 in the prior art and the cam assembly of the present application are installed on the bracket 9 at the same time. Then, the overall thickness of the mounting plate 11 plus the guide rail 10 is much smaller than the thickness of the axial moving unit 7 in the prior art. At this time, the distance between the resistance welding head and the bracket 9 will be smaller, which will make the welding easier. The force arm of the welding head 6 is shortened. After the force arm of the welding head 6 is shortened, the welding head 6 will be more stable and accurate when it is driven by the cam assembly to move radially. The welding head 6 will not be warped, and the contact area between the welding head 6 and the welded workpiece will be more stable, avoiding the situation where the current changes and weld explosion caused by the unstable contact area between the welding head 6 and the welded workpiece. When the radial movement of the welding head 6 is stable, the cylinder 2 in the resistance welding head works to drive the welding head 6 to move radially, control the lowering stroke of the welding head 6, and ensure that the contact area is more stable again.

[0025] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or basic features of the present application; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present application is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present application, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0026] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. Resistance welding head, characterized by: The invention comprises a mounting frame (1), a cylinder (2) and a displacement sensor (3) fixedly connected to one side of the mounting frame (1), a movable seat (5) slidably connected to one side of the mounting frame (1), and a welding head (6) fixedly connected to one side of the movable seat (5), wherein the telescopic end of the cylinder (2) is connected to one side of the movable seat (5), and the cylinder (2) and the displacement sensor (3) are both connected to a control module.

2. The resistance welding head according to claim 1, characterized in that: A cross roller bearing (4) is connected to one side of the movable seat (5), and the telescopic end of the cylinder (2) is fixedly connected to the inner ring of the cross roller bearing (4), and the outer ring of the cross roller bearing (4) is fixedly connected to the upper end of the movable seat (5).

3. The resistance welding head according to claim 2, characterized in that: A slide rail is fixedly connected to one side of the mounting frame (1), and the movable seat (5) is slidably connected to the slide rail.

4. The resistance welding head according to claim 3, characterized in that: The cylinder (2) controls the displacement of the moving seat (5) and the welding head (6) and cooperates with the displacement sensor (3) to realize stroke-controlled welding. The displacement is monitored by the displacement sensor (3) to confirm the welding state and ensure welding consistency.

5. Resistance welding equipment, characterized in that: The invention comprises a cam assembly for driving a resistance welding head to move radially, and the resistance welding head adopts the resistance welding head described in any one of claims 1 to 4.

6. The resistance welding device according to claim 5, characterized in that: The cam assembly comprises a bracket (9), a plurality of guide rails (10) fixedly connected to one side of the bracket (9), a mounting plate (11) slidably connected to the plurality of guide rails (10), a movable groove provided inside the mounting plate (11), a cam (12) rotatably connected to one side of the bracket (9), a cylinder (121) rotatably connected to one side of the cam (12), and a driving unit (13) fixedly connected to the other side of the bracket (9), wherein the cylinder (121) is located in the movable groove, an output shaft of the driving unit (13) is connected to the cam (12) and drives the cam (12) and the cylinder (121) to rotate, the cylinder (121) rotates in the movable groove and drives the mounting plate (11) to move radially on the guide rail (10), and a resistance welding machine head is fixedly connected to one side of the mounting plate (11).

Images