A plate welding device and method thereof

Abstract

The present invention relates to the technical field of spot welding, and discloses a plate welding device and a method thereof. The plate welding device includes a machine body and an electric push rod installed at one end of the machine body. An electrode column is installed at the lower end of the electric push rod. An electrode plate is further arranged at one end of the machine body. A connecting plate is installed on the outer surface of the electrode column. An auxiliary device is installed at the lower end of the connecting plate. The auxiliary device is used to squeeze the deformation of the plate body. The auxiliary device includes a cylinder connected to the lower end of the connecting plate. In the present invention, a squeezing knife is used to tear the deformed plate body, and then a liquid is sprayed to the deformed part through a nozzle until the liquid flows into the space between the part and the plate through the tear. The electrode column contacts the plate, the electrode column is powered on, and the electrode plate conducts electricity to the part. The plate is spot welded to the part through the electrode column, and the high-temperature solidified liquid at the spot welding place is used to increase the connection area between the plate part and the part.

Description

Technical Field

[0001] The present invention relates to the field of spot welding, and specifically to a plate welding device and method thereof. Background Art

[0002] Spot welding refers to a welding method in which columnar electrodes are used to form solder joints between the contact surfaces of two overlapping workpieces during welding. During spot welding, the workpieces are first pressed together tightly, and then the current is switched on. Under the action of the resistance heat, the contact part of the workpieces melts and forms a solder joint after cooling. Spot welding is mainly used for welding thin plate components and stamping parts with a thickness of less than 4 mm, and is especially suitable for welding automobile bodies and carriages, and aircraft fuselages.

[0003] During part processing, it is necessary to weld a plate bottom on one side of the part. However, the thickness of the plate is relatively thin, and the welding area generated by spot welding is relatively small. Therefore, after the plate is welded to the part, the plate is likely to fall off the part. And when the plate itself bends, since the molten pool needs to cool, but the bending elastic force of the spot-welded plate will pull the plate away from the part. Therefore, during the existing spot welding of parts, the processing effect is not good. Summary of the Invention

[0004] The present invention provides a plate welding device and method thereof, which solve the problem that the processing effect of the existing plate welding device mentioned in the above background art is not good.

[0005] The present invention provides the following technical solution: A plate welding device includes a machine body and an electric push rod installed at one end of the machine body. An electrode column is installed at the lower end of the electric push rod. An electrode plate is also provided at one end of the machine body. A square plate is installed on the outer surface of the electrode column. An auxiliary device is installed at the lower end of the square plate. The auxiliary device is used to extrude the deformation of the plate.

[0006] The auxiliary device includes a cylinder connected to the lower end of the square plate. A sliding sleeve is connected to the lower end of the cylinder. Two extrusion knives are installed at the lower end of the sliding sleeve. The extrusion knives are used to insert into the plate. Short shafts are also installed at both ends of the sliding sleeve. Rotary knives are installed on the outer surfaces of the short shafts. The rotary knives are used to extrude the deformation of the plate. A force-bearing plate is installed at the upper end of the rotary knife. A spray pipe is also installed at the lower end of the cylinder. The spray pipe is used to spray liquid onto the deformed part of the plate.

[0007] As an optional solution of the plate welding device of the present invention, wherein: A second spring is installed on the outer surface of the sliding sleeve. The sliding sleeve is connected to the cylinder through the second spring;

[0008] The sliding sleeve is slidably connected to the lower end of the cylinder;

[0009] An extrusion device is installed on the outer surface of the cylinder. The extrusion device includes an extrusion strip connected to the outer surface of the cylinder. The extrusion strip is used to abut against the force-bearing plate.

[0010] As an alternative solution of the plate welding device of the present invention, wherein: there is a gap between the two extrusion knives;

[0011] A conveying pipe is installed at the upper end of the nozzle, a pressure relief valve is arranged at the lower end of the nozzle, and the force-bearing plate is used to extrude the pressure relief valve to move;

[0012] The pressure relief valve is also used to extrude the force-bearing plate to rotate to one side, and the short shaft and the rotating knife are connected by a torsion spring.

[0013] As an alternative solution of the plate welding device of the present invention, wherein: the extrusion device further includes a ring sleeved on the outer surface of the cylinder, the ring and the cylinder are connected by a third spring, a vertical bar is installed on one side of the ring, the lower end of the vertical bar is connected to the upper end of the extrusion bar, and an adjustment groove is arranged between the vertical bar and the extrusion bar.

[0014] As an alternative solution of the plate welding device of the present invention, wherein: a jetting device is arranged at one end of the rotating knife, the jetting device is used to blow air to the plate, the jetting device includes a trachea arranged at one end of the rotating knife, and inclined holes are arranged on both sides of the rotating knife, and the inclined holes are communicated with the trachea;

[0015] A piston cavity is arranged inside the cylinder, a piston plate is installed inside the piston cavity, the upper end of the trachea is communicated with the inside of the piston cavity, a pull rod is installed at the lower end of the piston plate, and the lower end of the pull rod is connected to the upper end of the sliding sleeve.

[0016] As an alternative solution of the plate welding device of the present invention, wherein: the cylinder is slidably connected to the electrode post;

[0017] A buckling device is arranged inside the cylinder, the buckling device includes a round hole and a vertical groove arranged inside the cylinder, the round hole is located at the upper end of the vertical groove, a clamping column is slidably connected inside the round hole, a connecting plate is installed on one side of the clamping column, and the vertical groove and the electrode post are connected by a fourth spring;

[0018] A first spring is installed at the upper end of the cylinder, and the cylinder and the electric push rod are connected by the first spring.

[0019] As an alternative solution of the plate welding device of the present invention, wherein: a reset column is further installed at the lower end of the electric push rod, and the reset column is used to extrude the cylinder to slide downward.

[0020] As an alternative solution of the plate welding device of the present invention, wherein: a push column is installed on the other side of the clamping column, a vertical plate is further installed at one end of the machine body, and a convex block is installed on one side of the vertical plate, and the convex block is used to extrude the push column to slide to one side.

[0021] As an alternative solution of the plate welding device described in the present invention, wherein: the pressure relief valve includes a through groove, a sealing plate, a round shaft, a sliding plate and a return spring. A through groove is provided inside the spray pipe. A round shaft is slidably connected inside the through groove. A sliding plate is installed at the lower end of the round shaft. The sliding plate is connected to the spray pipe through a return spring.

[0022] The present invention also provides a welding method for a plate welding device:

[0023] S1. Place the parts on the electrode plate, then place the plate on the parts, and then drive the electrode column to slide downward through the electric push rod. The lower end face of the extrusion knife protrudes from the lower end of the electrode column. Therefore, the extrusion knife will first contact the plate and be extruded into the plate by the extrusion knife.

[0024] S2. Then rotate the rotary knife, and use the rotary knife to drive the extrusion knife to extrude the plate, so that the plate is torn and deformed by the extrusion knife.

[0025] S3. Then spray liquid to the deformed part of the plate through the spray pipe until it reaches the deformed part of the plate, and the liquid flows into the space between the part and the plate through the torn part.

[0026] S4. After executing S3, press against the plate with the extrusion strip to flatten the uneven plate.

[0027] S5. After executing S4, contact the plate with the electrode column, energize the electrode column, conduct electricity from the electrode plate to the part, and spot-weld the plate to the part through the electrode column. The high-temperature solidified liquid at the spot-welding point increases the connection area between the plate and the part.

[0028] The present invention has the following beneficial effects:

[0029] 1. For the plate welding device and its method, the extrusion knife is extruded into the plate. Since the plate is relatively thin, the extrusion knife will pierce the plate. Several extrusion knives pierce the plate, making the pierced part of the plate serrated. Then rotate the rotary knife, and use the rotary knife to drive the extrusion knife to extrude the plate, so that the plate in contact with the extrusion knife is torn and deformed by the extrusion knife. Then spray liquid to the deformed part of the plate through the spray pipe until it reaches the deformed part of the plate, and the liquid flows into the space between the part and the plate through the torn part. Contact the plate with the electrode column, energize the electrode column, conduct electricity from the electrode plate to the part, and spot-weld the plate to the part through the electrode column. The high-temperature solidified liquid at the spot-welding point increases the connection area between the plate and the part.

[0030] 2. For the plate welding device and its method, oblique holes are provided on both sides of the rotary knife to spray air, and the air is blown to the gap between the warped part of the plate and the part and the spot-welding point, so as to further accelerate the solidification of the liquid and the solidification of the molten pool, thereby reducing the separation of the plate body and the part caused by the bending elastic force of the plate. Brief Description of the Drawings

[0031] Figure 1 This is a schematic structural diagram of the whole of the present invention.

[0032] Figure 2 This is a schematic structural diagram of the auxiliary device of the present invention.

[0033] Figure 3 This is a main sectional view of the auxiliary device of the present invention.

[0034] Figure 4 This is a schematic structural diagram of the rotary knife of the present invention.

[0035] Figure 5 This is a schematic structural diagram of the reset post and the cylinder of the present invention.

[0036] Figure 6 For the present invention Figure 5 partial structural schematic diagram at position A.

[0037] In the figure: 1, machine tool body; 2, electric push rod; 3, electrode post; 4, electrode plate; 5, square plate; 6, auxiliary device; 7, extrusion device; 8, air jet device; 9, snap device; 10, delivery pipe; 12, nozzle; 13, pressure relief valve; 14, vertical plate; 15, convex block; 16, first spring; 18, reset post; 61, cylinder; 62, sliding sleeve; 63, second spring; 64, extrusion knife; 65, short shaft; 66, force-bearing plate; 67, rotary knife; 71, ring; 72, vertical bar; 73, third spring; 74, adjustment groove; 75, extrusion bar; 81, inclined hole; 82, air pipe; 83, piston chamber; 84, piston plate; 85, pull rod; 91, push post; 92, clamping post; 93, round hole; 94, vertical groove; 95, connecting plate; 96, fourth spring. Detailed Embodiment

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] Embodiment 1:

[0040] Please refer to Figure 1 - Figure 2 , a plate welding device includes a machine tool body 1 and an electric push rod 2 installed at one end of the machine tool body 1. An electrode post 3 is installed at the lower end of the electric push rod 2. An electrode plate 4 is also provided at one end of the machine tool body 1. A square plate 5 is installed on the outer surface of the electrode post 3. An auxiliary device 6 is installed at the lower end of the square plate 5. The auxiliary device 6 is used to extrude the deformation of the plate body;

[0041] The auxiliary device 6 includes a cylinder 61 connected to the lower end of the square plate 5. The lower end of the cylinder 61 is connected with a sliding sleeve 62. Two extrusion knives 64 are installed at the lower end of the sliding sleeve 62. The extrusion knives 64 are used to insert into the plate body. Short shafts 65 are also installed at both ends of the sliding sleeve 62. A rotary knife 67 is installed on the outer surface of the short shaft 65. The rotary knife 67 is used to extrude the plate body to deform. A force-receiving plate 66 is installed at the upper end of the rotary knife 67. A spray pipe 12 is also installed at the lower end of the cylinder 61. The spray pipe 12 is used to spray liquid onto the deformed part of the plate body.

[0042] According to Figure 1 and Figure 2 As shown, place the parts on the electrode plate 4, then place the plate on the parts, and then drive the electrode column 3 to slide downward through the electric push rod 2. The lower end surface of the extrusion knife 64 protrudes from the lower end of the electrode column 3. Therefore, the extrusion knife 64 will contact the plate first and be extruded into the plate through the extrusion knife 64. Since the plate is relatively thin, the extrusion knife 64 will pierce the plate. Several extrusion knives 64 pierce the plate, making the pierced part of the plate serrated. Then, rotate the rotary knife 67, and use the rotary knife 67 to drive the extrusion knife 64 to extrude the plate, so that the plate in contact with the extrusion knife 64 is torn and deformed by the extrusion knife 64. Then, spray liquid onto the deformed part through the spray pipe 12 to the deformed part of the plate, and the liquid flows into the space between the parts and the plate through the torn part. Contact the plate through the electrode column 3, the electrode column 3 is energized, and the electrode plate 4 conducts electricity to the parts. Spot-weld the plate to the parts through the electrode column 3, and the high-temperature solidified liquid at the spot-welding place is used to increase the connection area between the plate part and the parts;

[0043] The liquid is tin liquid, adhesive, etc.;

[0044] It should be particularly noted that the sliding sleeve 62 is slidably connected to the lower end of the cylinder 61. When the electrode column 3 contacts the plate, the sliding sleeve 62 contracts into the interior of the cylinder 61, so that the electrode column 3 spot-welds the plate to the parts.

[0045] Embodiment 2:

[0046] This embodiment is an improvement based on Embodiment 1. Specifically, please refer to Figure 1 - Figure 3 A second spring 63 is installed on the outer surface of the sliding sleeve 62. The sliding sleeve 62 is connected to the cylinder 61 through the second spring 63;

[0047] The sliding sleeve 62 is slidably connected to the lower end of the cylinder 61;

[0048] An extrusion device 7 is installed on the outer surface of the cylinder 61. The extrusion device 7 includes an extrusion strip 75 connected to the outer surface of the cylinder 61. The extrusion strip 75 is used to abut against the force-receiving plate 66;

[0049] A gap is provided between the two extrusion knives 64;

[0050] A delivery pipe 10 is installed at the upper end of the nozzle 12, and a pressure relief valve 13 is arranged at the lower end of the nozzle 12. The force-bearing plate 66 is used to extrude the pressure relief valve 13 to move;

[0051] The pressure relief valve 13 is also used to extrude the force-bearing plate 66 to rotate to one side, and the short shaft 65 and the rotary knife 67 are connected by a torsion spring.

[0052] According to Figure 3 As shown, when the extrusion knife 64 pierces the sheet material, the upward extrusion force of the part is greater than the elastic force of the second spring 63, so that the part extrudes the sliding sleeve 62 to slide upward. At this time, the extrusion bar 75 will abut against one side of the force-bearing plate 66, and the force-bearing plate 66 is extruded to swing downward through the extrusion bar 75. The force-bearing plate 66 drives the rotary knife 67 to swing. The rotary knife 67 takes the short shaft 65 as a fulcrum, so that the lower end of the rotary knife 67 swings to the other side, so that the rotary knife 67 extrudes the sheet material to tear and deform;

[0053] It should be particularly noted that the pressure relief valve 13 includes a through groove, a sealing plate, a round shaft, a sliding plate and a return spring. A through groove is arranged inside the nozzle 12, a round shaft is slidably connected inside the through groove, a sliding plate is installed at the lower end of the round shaft, and the sliding plate and the nozzle 12 are connected by a return spring.

[0054] Embodiment 3:

[0055] This embodiment is an improvement made on the basis of Embodiment 2. Specifically, please refer to Figure 1 - Figure 4 , the extrusion device 7 further includes a ring 71 sleeved on the outer surface of the cylinder 61. The ring 71 and the cylinder 61 are connected by a third spring 73. A vertical bar 72 is installed on one side of the ring 71, and the lower end of the vertical bar 72 is connected to the upper end of the extrusion bar 75. An adjustment groove 74 is arranged between the vertical bar 72 and the extrusion bar 75.

[0056] Subsequently, when the sliding sleeve 62 continues to slide upward, the force-bearing plate 66 will slide to the adjustment groove 74. At this time, the lower end of the pressure relief valve 13 contacts the other side of the force-bearing plate 66. By extruding the pressure relief valve 13 through the force-bearing plate 66, the lower end of the nozzle 12 is opened by the pressure relief valve 13, so that the liquid at the nozzle 12 flows out to the torn part of the sheet material;

[0057] Subsequently, when the sliding sleeve 62 continues to slide upward and the pressure relief valve 13 continues to extrude the other side of the force-bearing plate 66, the pressure relief valve 13 will extrude the other side of the force-bearing plate 66 to swing downward, so that the force-bearing plate 66 drives the rotary knife 67 to swing to the other side. By the rotary knife 67 extruding the torn notch of the sheet material to tilt upward, a notch is formed between the tilted part of the sheet material and the part, so that a large amount of the liquid flowing out of the nozzle 12 can be stored, so as to increase the connection area between the liquid and the plate body and the part, thereby further improving the connection strength between the plate body and the part.

[0058] Example 4:

[0059] This example is an improvement based on Example 3. Specifically, please refer to Figure 1 - Figure 4 , a jetting device 8 is provided at one end of the rotary cutter 67. The jetting device 8 is used to blow air onto the plate body. The jetting device 8 includes an air pipe 82 provided at one end of the rotary cutter 67. Oblique holes 81 are provided on both sides of the rotary cutter 67, and the oblique holes 81 communicate with the air pipe 82;

[0060] A piston chamber 83 is provided inside the cylinder 61. A piston plate 84 is installed inside the piston chamber 83. The upper end of the air pipe 82 communicates with the inside of the piston chamber 83. A pull rod 85 is installed at the lower end of the piston plate 84, and the lower end of the pull rod 85 is connected to the upper end of the sliding sleeve 62.

[0061] According to Figure 4 shown, when the plate extrudes the sliding sleeve 62 and contracts into the inside of the cylinder 61, the sliding sleeve 62 will compress the second spring 63, and the sliding sleeve 62 will push the piston plate 84 to slide upward through the pull rod 85. Use the upward sliding of the piston plate 84 to extract the air at the air pipe 82 to the lower end of the piston plate 84. Subsequently, after the liquid flowing out of the spray pipe 12 reaches the gap between the warped part of the plate and the part, and after the electrode post 3 is spot welded, when the electric push rod 2 drives the electrode post 3 to lift upward, use the second spring 63 to push the sliding sleeve 62 to slide downward, so that the sliding sleeve 62 drives the pull rod 85 and the piston plate 84 to slide downward, and use the piston plate 84 to squeeze the air at the lower end of the piston plate 84 to the air pipe 82, and transmit the air to the oblique hole 81 through the air pipe 82, so as to spray air through the oblique holes 81 provided on both sides of the rotary cutter 67, and blow the air to the gap between the warped part of the plate and the part and the spot welding place, so as to further accelerate the solidification of the liquid and the solidification of the molten pool, thereby reducing the bending elastic force of the plate to pull the plate body and the part apart;

[0062] It should be noted specifically that one side of the stress plate 66 is rotatably connected to the adjustment groove 74 at this time.

[0063] Example 5:

[0064] This example is an improvement based on Example 4. Specifically, please refer to Figure 1 - Figure 6 , the cylinder 61 is slidably connected to the electrode post 3;

[0065] A buckle device 9 is provided inside the cylinder 61. The buckle device 9 includes a round hole 93 and a vertical groove 94 provided inside the cylinder 61. The round hole 93 is located at the upper end of the vertical groove 94. A clamping column 92 is slidably connected inside the round hole 93. A connecting plate 95 is installed on one side of the clamping column 92. The vertical groove 94 and the electrode post 3 are connected by a fourth spring 96;

[0066] At the upper end of the cylinder 61, a first spring 16 is installed, and the cylinder 61 is connected to the electric push rod 2 through the first spring 16;

[0067] At the lower end of the electric push rod 2, a reset post 18 is also installed, and the reset post 18 is used to squeeze the cylinder 61 to slide downward;

[0068] On the other side of the clamping post 92, a pushing post 91 is installed. At one end of the machine body 1, a vertical plate 14 is also installed. On one side of the vertical plate 14, a convex block 15 is installed, and the convex block 15 is used to squeeze the pushing post 91 to slide to one side.

[0069] According to Figure 5 and Figure 6 As shown, when the electrode post 3 drives the cylinder 61 downward, after the rotary cutter 67 squeezes the plate to make the torn notch bulge upward, it touches the pushing post 91 through the convex block 15. By the convex block 15 squeezing the pushing post 91 and the clamping post 92 to slide to the right end, the clamping post 92 slides into the inside of the cylinder 61. At this time, the pushing post 91 slides into the round hole 93. The first spring 16 pulls the cylinder 61 to slide upward, so that the pushing post 91 is slidably connected to the vertical groove 94, so that the extrusion cutter 64 can quickly separate from the plate, thus avoiding the liquid at the torn notch of the plate from solidifying and adhering to the extrusion cutter 64 when the electrode post 3 spot-welds, thereby improving the adhesion and solidification effect;

[0070] Subsequently, when the electric push rod 2 continues to drive the electrode post 3 to slide upward for reset, the reset post 18 will touch the cylinder 61. At this time, the clamping post 92 touches the inside of the cylinder 61. When the reset post 18 squeezes the cylinder 61 to slide downward, the clamping post 92 will slide to the round hole 93, so as to push the connecting plate 95 and the clamping post 92 to snap into the round hole 93 through the fourth spring 96, so that the clamping post 92 fixes the cylinder 61 again.

[0071] Embodiment 6:

[0072] The present invention also provides a welding method for a plate welding device:

[0073] S1. Place the parts on the electrode plate 4, then place the plate on the parts, and then drive the electrode post 3 to slide downward through the electric push rod 2. The lower end surface of the extrusion cutter 64 protrudes from the lower end of the electrode post 3. Therefore, the extrusion cutter 64 will contact the plate first and squeeze into the plate through the extrusion cutter 64;

[0074] S2. Then rotate the rotary cutter 67, and use the rotary cutter 67 to drive the extrusion cutter 64 to squeeze the plate, so that the plate is torn and deformed by the extrusion cutter 64;

[0075] S3. Then spray liquid to the deformed part of the plate through the spray pipe 12 until the deformed part of the plate, and the liquid flows into the space between the parts and the plate through the torn part;

[0076] S4. After performing S3, press against the plate through the pressing strip 75 to flatten the uneven plate.

[0077] S5. After performing S4, make the electrode post 3 contact the plate. The electrode post 3 is energized, and the electrode plate 4 conducts electricity to the part. Spot-weld the plate to the part through the electrode post 3, and the high-temperature solidified liquid at the spot-welding position is used to increase the connection area between the plate and the part.

[0078] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0079] The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A plate welding device, comprising a machine body (1) and an electric push rod (2) mounted at one end of the machine body (1), an electrode column (3) being mounted at the lower end of the electric push rod (2), and an electrode plate (4) being further disposed at one end of the machine body (1), characterized in that: A square plate (5) is installed on the outer surface of the electrode column (3), and an auxiliary device (6) is installed at the lower end of the square plate (5), wherein the auxiliary device (6) is used to squeeze the plate body to deform; The auxiliary device (6) comprises a cylinder (61) connected to the lower end of the square plate (5); the lower end of the cylinder (61) is connected to a sliding sleeve (62); the lower end of the sliding sleeve (62) is provided with two extrusion knives (64); the extrusion knives (64) are used to be inserted into the plate body; short shafts (65) are also provided at both ends of the sliding sleeve (62); a rotating knife (67) is provided on the outer surface of the short shaft (65); the rotating knife (67) is used to extrude the plate body to deform; a force-bearing plate (66) is provided at the upper end of the rotating knife (67); a nozzle (12) is also provided at the lower end of the cylinder (61); the nozzle (12) is used to spray liquid onto the deformed part of the plate body; A second spring (63) is installed on the outer surface of the sliding sleeve (62), and the sliding sleeve (62) and the cylinder (61) are connected via the second spring (63); The sliding sleeve (62) is slidably connected to the lower end of the cylinder (61); An extrusion device (7) is installed on the outer surface of the cylinder (61), and the extrusion device (7) comprises an extrusion strip (75) connected to the outer surface of the cylinder (61), and the extrusion strip (75) is used to abut against the force-bearing plate (66); A gap is provided between the two extrusion knives (64); A delivery pipe (10) is installed at the upper end of the nozzle (12), a pressure relief valve (13) is provided at the lower end of the nozzle (12), and the force plate (66) is used to squeeze the pressure relief valve (13) to move; The pressure relief valve (13) is also used to squeeze the force-bearing plate (66) to rotate to one side, and the short shaft (65) and the rotating knife (67) are connected via a torque spring; The extrusion device (7) further comprises a circular ring (71) sleeved on the outer surface of the cylinder (61); the circular ring (71) and the cylinder (61) are connected via a third spring (73); a vertical bar (72) is mounted on one side of the circular ring (71); the lower end of the vertical bar (72) is connected to the upper end of the extrusion bar (75); and an adjustment groove (74) is provided between the vertical bar (72) and the extrusion bar (75).

2. The plate welding device according to claim 1, characterized in that: An air jet device (8) is provided at one end of the rotating blade (67), and the air jet device (8) is used to blow air toward the plate body, and the air jet device (8) comprises an air pipe (82) provided at one end of the rotating blade (67), and oblique holes (81) are provided on both sides of the rotating blade (67), and the oblique holes (81) are connected to the air pipe (82); A piston chamber (83) is provided inside the cylinder (61), a piston plate (84) is installed inside the piston chamber (83), the upper end of the air pipe (82) is connected to the inside of the piston chamber (83), a pull rod (85) is installed at the lower end of the piston plate (84), and the lower end of the pull rod (85) is connected to the upper end of the sliding sleeve (62).

3. The plate welding device according to claim 2, characterized in that: The cylinder (61) is slidably connected to the electrode column (3); A buckle device (9) is arranged inside the cylinder (61), and the buckle device (9) comprises a circular hole (93) and a vertical groove (94) arranged inside the cylinder (61), the circular hole (93) is located at the upper end of the vertical groove (94), a clamping column (92) is slidably connected inside the circular hole (93), a connecting plate (95) is installed on one side of the clamping column (92), and the vertical groove (94) is connected to the electrode column (3) via a fourth spring (96); A first spring (16) is installed at the upper end of the cylinder (61), and the cylinder (61) and the electric push rod (2) are connected via the first spring (16).

4. The plate welding device according to claim 3, characterized in that: A reset column (18) is also installed at the lower end of the electric push rod (2), and the reset column (18) is used to squeeze the cylinder (61) to slide downward.

5. The plate welding device according to claim 4, characterized in that: A push column (91) is installed on the other side of the clamping column (92), and a vertical plate (14) is also installed on one end of the machine body (1). A convex block (15) is installed on one side of the vertical plate (14), and the convex block (15) is used to press the push column (91) to slide to one side.

6. The plate welding device according to claim 1, characterized in that: The pressure relief valve (13) comprises a through groove, a sealing plate, a round shaft, a slide plate and a return spring. The nozzle (12) is provided with a through groove inside. The through groove is slidably connected to the inside of the through groove. The lower end of the round shaft is provided with a slide plate. The slide plate is connected to the nozzle (12) via a return spring.

7. The welding method of the plate welding device according to claim 5, characterized in that: S1, placing the part on the electrode plate (4), then placing the plate body on the part, then driving the electrode column (3) to slide downward by the electric push rod (2), the lower end surface of the extrusion knife (64) protruding from the lower end of the electrode column (3), so that the extrusion knife (64) will first contact the plate body and be squeezed into the plate body by the extrusion knife (64); S2, then rotating the rotary knife (67), using the rotary knife (67) to drive the extrusion knife (64) to extrude the plate body, so that the plate body is torn and deformed by the extrusion knife (64); S3, then spraying liquid to the deformed part through the nozzle (12) to the deformed part of the plate, and the liquid flows into the space between the part and the plate through the tearing part; S4, after executing S3, the uneven plate body is flattened by pressing the squeezing bar (75) against the plate body; S5. After executing S4, the electrode column (3) contacts the plate body, the electrode column (3) is energized, the electrode plate (4) conducts electricity to the part, the plate body is spot welded to the part through the electrode column (3), and the high-temperature liquid at the spot welding point solidifies, thereby increasing the connection area between the plate body and the part.

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