A resistance spot welding machine

Abstract

The present invention relates to the field of welding machines, specifically to a resistance welding machine, which includes a support frame, a driving mechanism, a welding mechanism, an adjusting mechanism, a cooling mechanism, a positioning mechanism and a control mechanism. When seam welding is required, the driving mechanism is turned on to drive the disc electrode to rotate. The workpiece is located between the two disc electrodes. As the disc electrode rotates, seam welding is performed on the surface of the workpiece. When electric welding is required, the disc electrode is rotated to make the columnar electrode in a vertical state, and the disc electrode is fixed using the positioning mechanism, so as to keep the columnar electrode in a vertical state. The adjusting mechanism is rotated to make the columnar electrode extend from the side wall of the disc electrode, so as to facilitate the worker to use the columnar electrode for electric welding work. When using the disc electrode, the coolant flowing in the present movement absorbs the temperature generated during the welding of the disc electrode. When using the columnar electrode, the coolant flowing inside the fixed sleeve absorbs the temperature generated during the welding of the columnar electrode, which is convenient for people to use.

Description

Technical Field

[0001] The present invention relates to the field of electric welding machines, specifically to a resistance electric welding machine. Background Art

[0002] A resistance welding machine is a welding device that uses the principle of resistance heating for welding. Resistance welding machines can be classified into different types according to different uses and requirements. Classified by welding methods, there are spot welding machines, seam welding machines, projection welding machines, butt welding machines, etc.; classified by the pressure application form of the electrodes, there are various types such as lever type, electric cam type, pneumatic type, hydraulic rod type, and combined pneumatic and hydraulic rod type; classified by the type of welding current of the resistance welding machine, there are single-phase power frequency welding machines, secondary rectifier welding machines, three-phase low-frequency welding machines, capacitor energy storage welding machines, and inverter power supply welding machines. A resistance welding machine mainly consists of a main circuit part, a pressure transmission part, and a control part.

[0003] When welding a vehicle body, different welding methods are required, and a resistance welding machine can only be applicable to one welding method. Therefore, during the processing of the vehicle body, it is necessary to replace the immovable electric welding machine, which is inconvenient for the operator to use and increases the production cost. Summary of the Invention

[0004] In view of the problems in the prior art, the present invention provides a resistance electric welding machine.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a resistance electric welding machine, including a support frame, a driving mechanism, a welding mechanism, an adjusting mechanism, a cooling mechanism, a positioning mechanism, and a control mechanism. One end of the support frame is provided with the welding mechanism for welding workpieces, and the side wall of the support frame is installed with the driving mechanism for driving the operation of the welding mechanism; the side wall of the welding mechanism is installed with the adjusting mechanism for adjusting different welding methods. The side wall of the driving mechanism is threadedly connected to the positioning mechanism for fixing the welding mechanism, and the positioning mechanism penetrates through the welding mechanism; the side wall of the welding mechanism is installed with the cooling mechanism for cooling the welding mechanism, the cooling mechanism is installed on the side wall of the driving mechanism, and the side walls of the cooling mechanism are symmetrically installed with the control mechanism for adjusting the flow direction of the refrigerant.

[0006] Preferably, the driving mechanism includes a hydraulic rod, a fixing plate, and a frequency conversion motor. The hydraulic rod is installed at the edge of the top surface of the support frame, one end of the hydraulic rod and the side wall of the support frame are respectively fixedly connected to the fixing plate, and the frequency conversion motor is installed inside the fixing plate.

[0007] Preferably, the welding mechanism includes a disc electrode and a columnar electrode. One end of the variable-frequency motor is equipped with the disc electrode, and the columnar electrode is slidably connected to one side of the disc electrode, and the height of the columnar electrode is less than the radius of the disc electrode.

[0008] Preferably, the adjusting mechanism includes a knob, a slide plate, a chute, and a fixing block. The slide plate is installed on the side wall of the disc electrode. The chute is provided on the side wall of the slide plate. The fixing block with a "T"-shaped side wall is slidably connected inside the chute, and the columnar electrode is installed at the bottom end of the fixing block; the inside of the fixing block is threadedly connected to the knob, and the knob abuts against the side wall of the slide plate, and the height of the slide plate is less than the radius of the disc electrode.

[0009] Preferably, the positioning mechanism includes a screw hole and a screw. The screw holes are respectively provided on the side walls of the fixing plate and the disc electrode. The screw penetrates through the screw hole, and the screw is threadedly connected to the inside of the fixing plate. The screw hole on the side wall of the disc electrode, the center of the disc electrode, and the center of the fixing block are located on the same straight line.

[0010] Preferably, the cooling mechanism includes a connecting plate, a connecting pipe, a fixing sleeve, an elastic pipe, and a joint. The bottom end of the disc electrode is slidably connected to the connecting plate with an arc-shaped side wall. The joint is installed at the bottom end of the connecting plate. The inside of the joint is threadedly connected to the fixing sleeve, and the fixing sleeve is sleeved on the side wall of the columnar electrode; spiral elastic pipes are respectively installed at both ends of the fixing sleeve, and the elastic pipes and the inside of the connecting plate are connected to the connecting pipe, and the connecting pipe is fixed to the side wall of the fixing plate.

[0011] Preferably, the control mechanism includes a cylinder body, a first piston, a second piston, a magnetic ring, a rotating rod, and a water pipe. The cylinder bodies are respectively installed at both ends of the connecting plate. Water pipes are symmetrically installed inside the cylinder body, and the top end of the cylinder body is fixedly connected to the connecting pipe; the rotating rod is rotatably connected to the side wall of the cylinder body, and the first piston and the second piston are fixedly connected to the side wall of the rotating rod. The cylindrical first piston and the second piston are rotatably connected to the inside of the water pipe; the magnetic ring is installed inside the water pipe, the magnetic ring adsorbs the elastic first piston and the second piston, and the first piston and the second piston are perpendicular to each other; one water pipe communicates with the inside of the elastic pipe, and the other water pipe communicates with the inside of the connecting plate.

[0012] Advantages of the present invention:

[0013] (1) A resistance spot welding machine according to the present invention, when seam welding is required, the driving mechanism is turned on, so that the driving mechanism drives the disc electrode to rotate. The workpiece is located between the two disc electrodes. As the disc electrode rotates, seam welding is performed on the surface of the workpiece; when electric welding is required, the disc electrode is rotated to make the columnar electrode in a vertical state, and the positioning mechanism is used to fix the disc electrode, so as to keep the columnar electrode in a vertical state; the adjusting mechanism is rotated to make the columnar electrode protrude from the side wall of the disc electrode, so as to facilitate the worker to use the columnar electrode for electric welding work.

[0014] (2) A resistance spot welding machine according to the present invention, when using the disc electrode, the disc electrode slides on the side wall of the connecting plate. At this time, the coolant continuously flows inside the connecting plate, so that the coolant absorbs the temperature generated during the welding of the disc electrode; when using the columnar electrode, the fixing sleeve is sleeved on the side wall of the columnar electrode. At this time, the elastic tube contracts, driving the fixing sleeve to move towards the disc electrode. The control mechanism is rotated to change the flow direction of the coolant, so that the coolant flows inside the fixing sleeve. When using the columnar electrode, the coolant inside the fixing sleeve absorbs the temperature generated during the welding of the columnar electrode, preventing the temperature of the electrode from being too high during use. Description of the Drawings

[0015] The present invention will be further described below with reference to the drawings and embodiments.

[0016] Figure 1 It is a schematic structural diagram of a preferred embodiment of a resistance spot welding machine provided by the present invention;

[0017] Figure 2 is Figure 1 a front view of the structure of the disc electrode shown;

[0018] Figure 3 is Figure 1 an exploded view of the internal structure of the adjusting mechanism shown;

[0019] Figure 4 is Figure 3 a rear view of the structure of the disc electrode shown;

[0020] Figure 5 is Figure 4 a schematic diagram of the structure of the fixing sleeve shown;

[0021] Figure 6 is Figure 4 a schematic diagram of the internal structure of the control mechanism shown;

[0022] Figure 7 is Figure 1 a side view of the structure of the fixing plate shown.

[0023] In the figure: 1. Support frame; 2. Driving mechanism, 21. Hydraulic rod, 22. Fixed plate, 23. Variable-frequency motor; 3. Welding mechanism, 31. Disc electrode, 32. Columnar electrode; 4. Adjusting mechanism, 41. Knob, 42. Slide plate, 43. Chute, 44. Fixed block; 5. Cooling mechanism, 51. Connecting plate, 52. Connecting pipe, 53. Fixed sleeve, 54. Elastic tube, 55. Connector; 6. Positioning mechanism, 61. Screw hole, 62. Screw; 7. Control mechanism, 71. Cylinder body, 72. First piston, 73. Second piston, 74. Magnetic ring, 75. Rotating rod, 76. Water pipe. Detailed implementation manners

[0024] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0025] As Figures 1-7 shown, a resistance spot welder according to the present invention includes a support frame 1, a driving mechanism 2, a welding mechanism 3, an adjusting mechanism 4, a cooling mechanism 5, a positioning mechanism 6 and a control mechanism 7. One end of the support frame 1 is provided with the welding mechanism 3 for welding workpieces, and the side wall of the support frame 1 is installed with the driving mechanism 2 for driving the welding mechanism 3 to operate; the side wall of the welding mechanism 3 is installed with the adjusting mechanism 4 for adjusting different welding methods, and the side wall of the driving mechanism 2 is threadedly connected to the positioning mechanism 6 for fixing the welding mechanism 3, and the positioning mechanism 6 penetrates through the welding mechanism 3; the side wall of the welding mechanism 3 is installed with the cooling mechanism 5 for cooling the welding mechanism 3, the cooling mechanism 5 is installed on the side wall of the driving mechanism 2, and the side wall of the cooling mechanism 5 is symmetrically installed with the control mechanism 7 for adjusting the flow direction of the refrigerant.

[0026] The driving mechanism 2 includes a hydraulic rod 21, a fixing plate 22 and a variable-frequency motor 23. The hydraulic rod 21 is installed at the edge of the top surface of the support frame 1. One end of the hydraulic rod 21 and the side wall of the support frame 1 are respectively fixedly connected to the fixing plate 22. The variable-frequency motor 23 is installed inside the fixing plate 22. The welding mechanism 3 includes a disc electrode 31 and a columnar electrode 32. One end of the variable-frequency motor 23 is installed with the disc electrode 31, and the columnar electrode 32 is slidably connected to one side of the disc electrode 31, and the height of the columnar electrode 32 is less than the radius of the disc electrode 31. When seam welding is required, the workpiece is placed above one of the disc electrodes 31, and the hydraulic rod 21 is opened. The hydraulic rod 21 pushes the fixing plate 22, the variable-frequency motor 23 and the other disc electrode 31 downward, so that the workpiece to be welded is located between the two disc electrodes 31. The variable-frequency motor 23 is opened, and the variable-frequency motor 23 drives the disc electrode 31 to rotate. Then the disc electrode 31 is powered on, and the disc electrode 31 performs seam welding on the workpiece. When electric welding is required, the workpiece is placed above one of the columnar electrodes 32, and the hydraulic rod 21 is opened. The hydraulic rod 21 pushes the other columnar electrode 32 downward to press the workpiece, and electric welding is performed on the workpiece after the current is connected.

[0027] The adjusting mechanism 4 includes a knob 41, a sliding plate 42, a sliding groove 43 and a fixing block 44. The sliding plate 42 is installed on the side wall of the disc electrode 31. The sliding groove 43 is provided on the side wall of the sliding plate 42. The fixing block 44 with a "T"-shaped side wall is slidably connected inside the sliding groove 43. The bottom end of the fixing block 44 is installed with the columnar electrode 32. The inside of the fixing block 44 is threadedly connected to the knob 41, and the knob 41 abuts against the side wall of the sliding plate 42, and the height of the sliding plate 42 is less than the radius of the disc electrode 31. When spot welding is required, the knob 41 is rotated to make the knob 41 slide out of the inside of the fixing block 44 and separate the knob 41 from the side wall of the sliding plate 42. The fixing block 44 is slid to make the fixing block 44 and the knob 41 move downward along the sliding groove 43, and at the same time, the fixing block 44 pushes the columnar electrode 32 to slide out of the side wall of the disc electrode 31. When the position of the columnar electrode 32 is appropriate, the knob 41 is rotated to make the knob 41 rotate into the side wall of the fixing block 44, and at the same time, the knob 41 presses the side wall of the sliding plate 42 to fix the fixing block 44 and the columnar electrode 32.

[0028] The positioning mechanism 6 includes a screw hole 61 and a screw 62. The screw holes 61 are respectively provided on the side walls of the fixing plate 22 and the disc electrode 31. The screw 62 passes through the screw hole 61, and the screw 62 is threadedly connected to the inside of the fixing plate 22. The screw hole 61 on the side wall of the disc electrode 31, the center of the disc electrode 31, and the center of the fixing block 44 are located on the same straight line. When the columnar motor 32 needs to be used, rotate the disc electrode 31 to align the screw hole 61 on the side wall of the disc electrode 31 with the screw hole 61 on the side wall of the fixing plate 22. At this time, the columnar motor 32 is in a vertical state. Pass the screw 62 through the screw hole 61 and into the inside of the fixing plate 22, so that the screw 62 fixes the disc electrode 31 and makes the columnar electrode 32 fixed in a vertical state, facilitating people to carry out electric welding.

[0029] The cooling mechanism 5 includes a connecting plate 51, a connecting pipe 52, a fixing sleeve 53, an elastic tube 54, and a joint 55. The bottom end of the disc electrode 31 is slidably connected to the connecting plate 51 with an arc-shaped side wall. The joint 55 is installed at the bottom end of the connecting plate 51. The inside of the joint 55 is threadedly connected to the fixing sleeve 53, and the fixing sleeve 53 is sleeved on the side wall of the columnar electrode 32. Spiral elastic tubes 54 are respectively installed at both ends of the fixing sleeve 53, and the elastic tubes 54 and the inside of the connecting plate 51 communicate with the connecting pipe 52, and the connecting pipe 52 is fixed to the side wall of the fixing plate 22. When using the disc electrode 31, the disc electrode 31 slides on the side wall of the connecting plate 51. At this time, the coolant continuously flows from the inside of the connecting plate 51 through the connecting pipe 52, so that the coolant absorbs the temperature generated during the welding of the disc electrode 31. When using the columnar electrode, rotate the fixing sleeve 53, take out the fixing sleeve 53 from the bottom end of the connecting plate 51, pull the fixing sleeve 53, and the fixing sleeve 53 stretches the spiral elastic tube 54. Install the fixing sleeve 53 on the side wall of the columnar electrode 32. At this time, the elastic tube 54 contracts, driving the fixing sleeve 53 to move towards the disc electrode 31 and fixing the fixing sleeve 53 on the side wall of the columnar electrode 32 to prevent the fixing sleeve 53 from affecting the welding work. When using the columnar electrode 32, the coolant inside the fixing sleeve 53 absorbs the temperature generated during the welding of the columnar electrode 32 to prevent the temperature of the electrode from being too high during use.

[0030] The control mechanism 7 includes a cylinder body 71, a first piston 72, a second piston 73, a magnetic ring 74, a rotating rod 75 and a water pipe 76. The two ends of the connecting plate 51 are respectively provided with the cylinder body 71. The water pipes 76 are symmetrically installed inside the cylinder body 71, and the top end of the cylinder body 71 is fixedly connected to the connecting pipe 52. The side wall of the cylinder body 71 is rotationally connected to the rotating rod 75. The side wall of the rotating rod 75 is fixedly connected to the first piston 72 and the second piston 73. The cylindrical first piston 72 and the second piston 73 are rotationally connected to the inside of the water pipe 76. The magnetic ring 74 is installed inside the water pipe 76. The magnetic ring 74 adsorbs the elastic first piston 72 and the second piston 73, and the first piston 72 and the second piston 73 are perpendicular to each other. One water pipe 76 communicates with the inside of the elastic tube 54, and the other water pipe 76 communicates with the inside of the connecting plate 51. When it is necessary for the coolant to flow inside the connecting plate 51, rotate the rotating rod 75. The rotating rod 75 drives the first piston 72 and the second piston 73 to rotate inside the water pipe 76, so that the first piston 72 rotates and abuts against the magnetic ring 74 inside the water pipe 76. The magnetic ring 74 adsorbs the first piston 72 to fix the first piston 72 and the second piston 73, so that the first piston 72 is engaged with the water pipe 76 communicating with the elastic tube 54, and the second piston 73 rotates to open the water pipe 76 communicating with the connecting plate 71, so that the coolant passes through the water pipe 76 and continuously flows inside the connecting plate 71 to absorb the heat generated during the welding of the disc electrode 31. Similarly, when it is necessary for the coolant to flow inside the fixed sleeve 53, rotate the rotating rod 75. The rotating rod 75 drives the first piston 72 and the second piston 73 to rotate 90° inside the water pipe 76, so that the second piston 73 rotates and abuts against the magnetic ring 74 inside the water pipe 76, so that the first piston 72 rotates to open the water pipe 76 communicating with the elastic tube 54, and the second piston 73 rotates to engage with the water pipe 76 communicating with the connecting plate 71, so that the coolant passes through the water pipe 76 and continuously flows inside the fixed sleeve 53 to absorb the heat generated during the welding of the cylindrical electrode 32.

[0031] During use, connect the connecting pipe 52 to the chiller, and then connect the device to an external power supply. When seam welding is required, rotate the rotating rod 75. The rotating rod 75 drives the first piston 72 and the second piston 73 to rotate inside the water pipe 76, so that the first piston 72 rotates and abuts against the magnetic ring 74 inside the water pipe 76. The magnetic ring 74 adsorbs the first piston 72 to fix the first piston 72 and the second piston 73, so that the first piston 72 is engaged with the elastic pipe 54 to communicate with the water pipe 76, and the second piston 73 rotates to open and communicate with the connecting plate 71 to the water pipe 76. The chiller operates to make the refrigerant flow continuously through the water pipe 76 inside the connecting plate 71. Place the workpiece above one of the disc electrodes 31, turn on the hydraulic rod 21. The hydraulic rod 21 pushes the fixing plate 22, the variable-frequency motor 23 and the other disc electrode 31 downward, so that the workpiece to be welded is located between the two disc electrodes 31. Turn on the variable-frequency motor 23. The variable-frequency motor 23 drives the disc electrode 31 to rotate, and then connect the disc electrode 31 to the power supply to make the disc electrode 31 perform seam welding on the workpiece. At this time, the disc electrode 31 slides on the side wall of the connecting plate 51. At this time, the refrigerant continuously flows from the inside of the connecting plate 51 through the connecting pipe 52, so that the refrigerant absorbs the temperature generated during the welding of the disc electrode 31. When electric welding is required, rotate the disc electrode 31 so that the screw hole 61 on the side wall of the disc electrode 31 is aligned with the screw hole 61 on the side wall of the fixing plate 22. At this time, the columnar motor 32 is in a vertical state. Pass the screw rod 62 through the screw hole 61 and into the inside of the fixing plate 22 to fix the disc electrode 31 with the screw rod 62 and fix the columnar electrode 32 in a vertical state; rotate the knob 41 so that the knob 41 slides out of the inside of the fixed block 44 and separates from the side wall of the slide plate 42. Slide the fixed block 44 so that the fixed block 44 and the knob 41 move downward along the chute 43. At the same time, make the fixed block 44 push the columnar electrode 32 out of the side wall of the disc electrode 31. When the position of the columnar electrode 32 is appropriate, rotate the knob 41 so that the knob 41 rotates into the side wall of the fixed block 44. At the same time, make the knob 41 squeeze the side wall of the slide plate 42 to fix the fixed block 44 and the columnar electrode 32.Rotate the fixed sleeve 53, remove the fixed sleeve 53 from the bottom end of the connecting plate 51, pull the fixed sleeve 53, the fixed sleeve 53 stretches the spiral elastic tube 54, install the fixed sleeve 53 on the side wall of the columnar electrode 32. At this time, the elastic tube 54 contracts, driving the fixed sleeve 53 to move towards the direction of the disc electrode 31, and fix the fixed sleeve 53 on the side wall of the columnar electrode 32 to prevent the fixed sleeve 53 from affecting the welding work; Rotate the rotating rod 75, the rotating rod 75 drives the first piston 72 and the second piston 73 to rotate 90° inside the water pipe 76, so that the second piston 73 rotates and abuts against the magnetic ring 74 inside the water pipe 76, so that the first piston 72 rotates to open the water pipe 76 communicating with the elastic tube 54, and the second piston 73 rotates and engages with the water pipe 76 communicating with the connecting plate 71. The chiller operates to make the refrigerant flow continuously through the water pipe 76 inside the fixed sleeve 53. Place the workpiece above one of the columnar electrodes 32, open the hydraulic rod 21, the hydraulic rod 21 pushes the other columnar electrode 32 to move downward to squeeze the workpiece, and after connecting the current, perform electric welding on the workpiece. When using the columnar electrode 32, make the refrigerant inside the fixed sleeve 53 absorb the temperature generated during the welding of the columnar electrode 32 to prevent the temperature of the electrode from being too high during use.

[0032] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above-described embodiments and descriptions in the specification are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and all these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A resistance welding machine, characterized in that: it includes a support frame (1), a driving mechanism (2), a welding mechanism (3), an adjusting mechanism (4), a cooling mechanism (5), a positioning mechanism (6) and a control mechanism (7). At one end of the support frame (1), the welding mechanism (3) for welding workpieces is provided, and on the side wall of the support frame (1), the driving mechanism (2) for driving the operation of the welding mechanism (3) is installed; on the side wall of the welding mechanism (3), the adjusting mechanism (4) for adjusting different welding methods is installed. There is a threaded connection between the side wall of the driving mechanism (2) and the positioning mechanism (6) for fixing the welding mechanism (3), and the positioning mechanism (6) penetrates through the welding mechanism (3); on the side wall of the welding mechanism (3), the cooling mechanism (5) for cooling the welding mechanism (3) is installed. The cooling mechanism (5) is installed on the side wall of the driving mechanism (2), and on the side wall of the cooling mechanism (5), the control mechanism (7) for adjusting the flow direction of the refrigerant is symmetrically installed; the driving mechanism (2) includes a hydraulic rod (21), a fixing plate (22) and a variable-frequency motor (23). The hydraulic rod (21) is installed at the edge of the top surface of the support frame (1). One end of the hydraulic rod (21) and the side wall of the support frame (1) are respectively fixedly connected to the fixing plate (22), and the variable-frequency motor (23) is installed inside the fixing plate (22); the welding mechanism (3) includes a disc electrode (31) and a columnar electrode (32). One end of the variable-frequency motor (23) is installed with the disc electrode (31), and the columnar electrode (32) is slidably connected to one side of the disc electrode (31), and the height of the columnar electrode (32) is less than the radius of the disc electrode (31); the adjusting mechanism (4) includes a knob (41), a slide plate (42), a chute (43) and a fixing block (44). The slide plate (42) is installed on the side wall of the disc electrode (31). The chute (43) is provided on the side wall of the slide plate (42). The fixing block (44) with a "T"-shaped side wall is slidably connected inside the chute (43), and the columnar electrode (32) is installed at the bottom end of the fixing block (44); there is a threaded connection between the inside of the fixing block (44) and the knob (41), and the knob (41) abuts against the side wall of the slide plate (42), and the height of the slide plate (42) is less than the radius of the disc electrode (31).

2. The resistance welding machine according to claim 1, characterized in that: The positioning mechanism (6) includes a screw hole (61) and a screw (62). The screw holes (61) are respectively provided on the side walls of the fixing plate (22) and the disc electrode (31). The screw (62) passes through the screw hole (61), and the screw (62) is threadedly connected to the inside of the fixing plate (22). The screw hole (61) on the side wall of the disc electrode (31), the center of the disc electrode (31), and the center of the fixing block (44) are located on the same straight line.

3. A resistance welding machine according to claim 1, characterized in that: The cooling mechanism (5) includes a connecting plate (51), a connecting pipe (52), a fixing sleeve (53), an elastic pipe (54), and a joint (55). The bottom end of the disc electrode (31) is slidably connected to the connecting plate (51) with an arc-shaped side wall. The joint (55) is installed at the bottom end of the connecting plate (51). The inside of the joint (55) is threadedly connected to the fixing sleeve (53), and the fixing sleeve (53) is sleeved on the side wall of the columnar electrode (32); spiral elastic pipes (54) are respectively installed at both ends of the fixing sleeve (53), and the elastic pipes (54) and the inside of the connecting plate (51) communicate with the connecting pipe (52), and the connecting pipe (52) is fixed to the side wall of the fixing plate (22).

4. A resistance welding machine according to claim 3, characterized in that: The control mechanism (7) includes a cylinder body (71), a first piston (72), a second piston (73), a magnetic ring (74), a rotating rod (75), and a water pipe (76). The cylinder bodies (71) are respectively installed at both ends of the connecting plate (51). The water pipes (76) are symmetrically installed inside the cylinder body (71), and the top end of the cylinder body (71) is fixedly connected to the connecting pipe (52); the rotating rod (75) is rotatably connected to the side wall of the cylinder body (71), and the first piston (72) and the second piston (73) are fixedly connected to the side wall of the rotating rod (75). The cylindrical first piston (72) and the second piston (73) are rotatably connected to the inside of the water pipe (76); the magnetic ring (74) is installed inside the water pipe (76), and the magnetic ring (74) adsorbs the elastic first piston (72) and the second piston (73), and the first piston (72) and the second piston (73) are perpendicular to each other; one water pipe (76) communicates with the inside of the elastic pipe (54), and the other water pipe (76) communicates with the inside of the connecting plate (51).

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