Plate body welding device and method thereof

Abstract

The invention relates to the technical field of spot welding, and discloses a plate body welding device and a method thereof.The plate body welding device comprises a machine tool body and an electric push rod installed at one end of the machine tool 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 tool body, and a connecting plate is installed on the outer surface of the electrode column; an auxiliary device is mounted at the lower end of the connecting plate, is used for extruding the plate body to deform, and comprises a cylinder connected to the lower end of the connecting plate. The deformed plate body is torn through the extrusion knife, then the spraying pipe is used for spraying liquid to the deformed position of the plate, the liquid flows into the position between the part and the plate through the torn position, the plate makes contact with the electrode column, the electrode column is powered on, the electrode plate conducts electricity to the part, and the plate is spot-welded to the part through the electrode column. And the high-temperature solidification liquid at the spot welding position can enlarge the connecting area of the plate and the part.

Description

Technical Field

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

[0002] Spot welding refers to a welding method that uses a cylindrical electrode to form a weld between the contact surfaces of two overlapping workpieces. During spot welding, pressure is first applied to make the workpieces in close contact, and then the current is turned on. The contact between the workpieces melts under the action of resistance heat, and the weld is formed after cooling. Spot welding is mainly used for the welding of sheet metal stampings with a thickness of less than 4mm, and is particularly suitable for the welding of automobile bodies and compartments, and aircraft fuselages.

[0003] When processing parts, it is necessary to weld a plate to the bottom of the part, but the thickness of the plate is relatively thin and the welding area produced by spot welding is small. Therefore, after the plate is welded on the part, the plate is easy to fall off the part, and when the plate itself bends, the molten pool needs to cool, but the bending elastic force of the spot-welded plate will pull the plate apart from the part. Therefore, when spot welding existing parts, the processing effect is not good. Summary of the invention

[0004] The present invention provides a plate welding device and a method thereof, which solve the problem of poor processing effect of the existing plate welding device mentioned in the above background technology.

[0005] The present invention provides the following technical solution: a plate welding device comprises 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, and the auxiliary device is used to squeeze the plate body for deformation; The auxiliary device includes a cylinder connected to the lower end of the square plate, the lower end of the cylinder is connected to a sliding sleeve, the lower end of the sliding sleeve is equipped with two extrusion knives, the extrusion knives are used to be inserted into the plate body, short shafts are also installed at both ends of the sliding sleeve, the outer surface of the short shaft is equipped with a rotating knife, the rotating knife is used to extrude the plate body to deform, the upper end of the rotating knife is equipped with a force plate, and the lower end of the cylinder is also equipped with a nozzle, the nozzle is used to spray liquid to the deformed part of the plate body.

[0006] 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, and the sliding sleeve is connected to the cylinder through the second spring; The sliding sleeve is slidably connected to the lower end of the cylinder; 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.

[0007] As an optional solution of the plate welding device of the present invention, wherein: a gap is provided between the two extrusion knives; A delivery 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 plate is used to squeeze the pressure relief valve to move; The pressure relief valve is also used to squeeze the force-bearing plate to rotate to one side, and the short shaft is connected to the rotating knife through a torque spring.

[0008] As an optional solution of the plate welding device described in the present invention, the extrusion device also 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 provided between the vertical bar and the extrusion bar.

[0009] As an optional solution of the plate welding device of the present invention, wherein: an air jet device is provided at one end of the rotating knife, the air jet device is used to blow air to the plate, the air jet device comprises an air pipe provided at one end of the rotating knife, and oblique holes are provided on both sides of the rotating knife, and the oblique holes are connected to the air pipe; A piston cavity is provided inside the cylinder, a piston plate is installed inside the piston cavity, the upper end of the air pipe is connected with the interior 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.

[0010] As an optional solution of the plate welding device of the present invention, wherein: the cylinder is slidably connected to the electrode column; A buckle device is provided inside the cylinder, and the buckle device includes a circular hole and a vertical slot provided inside the cylinder, the circular hole is located at the upper end of the vertical slot, a clamping column is slidably connected inside the circular hole, a connecting plate is installed on one side of the clamping column, and the vertical slot is connected to the electrode column through a fourth spring; A first spring is installed at the upper end of the cylinder, and the cylinder is connected to the electric push rod through the first spring.

[0011] As an optional solution of the plate welding device described in the present invention, a reset column is also installed at the lower end of the electric push rod, and the reset column is used to squeeze the cylinder to slide downward.

[0012] As an optional solution of the plate welding device described in the present invention, a push column is installed on the other side of the clamping column, a vertical plate is also installed at one end of the machine body, a protrusion is installed on one side of the vertical plate, and the protrusion is used to squeeze the push column to slide to one side.

[0013] As an optional solution of the plate welding device described in the present invention, the pressure relief valve includes a through groove, a sealing plate, a round shaft, a slide plate and a return spring, the interior of the nozzle is provided with a through groove, the interior of the through groove is slidably connected with a round shaft, a slide plate is installed at the lower end of the round shaft, and the slide plate is connected to the nozzle through a return spring.

[0014] The present invention also provides a welding method for a plate welding device: S1. Place the part on the electrode plate, then place the plate on the part, and then drive the electrode column to slide downward through the electric push rod. The lower end surface of the extrusion knife protrudes from the lower end of the electrode column, so the extrusion knife will first contact the plate and squeeze into the plate through the extrusion knife; S2, then rotating the rotary knife to drive the extrusion knife to extrude the plate, so that the plate is torn and deformed by the extrusion knife; S3, then spraying liquid to the deformed part of the plate through the nozzle, and the liquid flows into the space between the part and the plate through the tearing part; S4, after executing S3, the uneven plate is flattened by pressing the extrusion bar against the plate; S5. After executing S4, the plate is in contact with the electrode column, the electrode column is energized, the electrode plate conducts electricity to the part, and the plate is spot welded to the part through the electrode column. The high temperature at the spot welding point solidifies the liquid, thereby increasing the connection area between the plate and the part.

[0015] The present invention has the following beneficial effects: 1. The plate welding device and method thereof use an extrusion knife to squeeze into the plate. Since the plate is thin, the extrusion knife will pierce the plate. Several extrusion knives pierce the plate, so that the pierced plate is serrated. Then, the rotary knife is rotated, and the rotary knife is used 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, liquid is sprayed to the deformed part of the plate through a nozzle, and the liquid flows into the part and the plate through the torn part. The plate contacts through the electrode column, the electrode column is energized, 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 at the spot welding part solidifies the liquid, thereby increasing the connection area between the plate and the part.

[0016] 2. The plate welding device and method thereof spray air through inclined holes arranged on both sides of the rotating knife, and the air is blown to the raised parts of the plate, the gaps between the parts and the spot welding parts, so as to further accelerate the solidification of the liquid and the molten pool, thereby reducing the bending elastic force of the plate to pull the plate and the parts apart. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2It is a schematic diagram of the structure of the auxiliary device of the present invention.

[0019] Figure 3 It is a main cross-sectional view of the auxiliary device of the present invention.

[0020] Figure 4 It is a structural schematic diagram of a rotary knife of the present invention.

[0021] Figure 5 It is a schematic structural diagram of the reset column and the cylinder of the present invention.

[0022] Figure 6 For the present invention Figure 5 Schematic diagram of the local structure at point A.

[0023] In the figure: 1, machine body; 2, electric push rod; 3, electrode column; 4, electrode plate; 5, square plate; 6, auxiliary device; 7, extrusion device; 8, jet device; 9, buckle device; 10, delivery pipe; 12, nozzle; 13, pressure relief valve; 14, vertical plate; 15, bump; 16, first spring; 18, reset column; 61, cylinder; 62, sliding sleeve; 63, second spring; 64, extrusion knife; 65, short shaft; 66, force plate; 67, rotating knife; 71, ring; 72, vertical bar; 73, third spring; 74, adjustment groove; 75, extrusion bar; 81, oblique hole; 82, air pipe; 83, piston chamber; 84, piston plate; 85, pull rod; 91, push column; 92, clamping column; 93, round hole; 94, vertical groove; 95, connecting plate; 96, fourth spring. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Embodiment 1: See also Figure 1-Figure 2 A plate welding device comprises a machine body 1 and an electric push rod 2 installed at one end of the machine body 1, an electrode column 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 body 1, a square plate 5 is installed on the outer surface of the electrode column 3, an auxiliary device 6 is installed at the lower end of the square plate 5, and the auxiliary device 6 is used to squeeze the plate body for deformation; 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 to a sleeve 62, the lower end of the sleeve 62 is equipped with two extrusion knives 64, the extrusion knives 64 are used to be inserted into the plate body, short shafts 65 are also installed at both ends of the sleeve 62, and a rotating knife 67 is installed on the outer surface of the short shaft 65, the rotating knife 67 is used to extrude the plate body to deform, and a force plate 66 is installed on the upper end of the rotating knife 67. The lower end of the cylinder 61 is also equipped with a nozzle 12, and the nozzle 12 is used to spray liquid to the deformed part of the plate body.

[0026] according to Figure 1 and Figure 2 As shown, the part is placed on the electrode plate 4, and then the plate is placed on the part, and then the electric push rod 2 drives the electrode column 3 to slide downward, and the lower end surface of the extrusion knife 64 protrudes from the lower end of the electrode column 3, so the extrusion knife 64 will first contact the plate, and squeeze into the plate through the extrusion knife 64. Since the plate is thin, the extrusion knife 64 will pierce the plate, and several extrusion knives 64 pierce the plate, so that the pierced plate is serrated, and then the rotating knife 67 is rotated, and the rotating knife 67 is used 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, and then the liquid is sprayed to the deformation part of the plate through the nozzle 12, and the liquid flows into the part and the plate through the torn part, and the plate contacts through the electrode column 3, the electrode column 3 is energized, and the electrode plate 4 conducts electricity to the part, and the plate is spot welded to the part through the electrode column 3, and the high temperature solidifies the liquid at the spot welding part, so as to increase the connection area between the plate and the part; The liquid is tin liquid, adhesive, etc. It should be particularly noted that the sleeve 62 is slidably connected to the lower end of the cylinder 61. When the electrode column 3 contacts the plate, the sleeve 62 shrinks to the inside of the cylinder 61, so that the electrode column 3 spot welds the plate to the part.

[0027] Embodiment 2: This embodiment is an improvement made on the basis of embodiment 1. For details, please refer to Figure 1-Figure 3 , 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 by the second spring 63; The sliding sleeve 62 is slidably connected to the lower end of the cylinder 61; The outer surface of the cylinder 61 is provided with an extrusion device 7, which includes 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; The upper end of the nozzle 12 is provided with a delivery pipe 10, the lower end of the nozzle 12 is provided with a pressure relief valve 13, 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 by a torque spring.

[0028] according to Figure 3 As shown, after the extrusion knife 64 pierces the plate, the upward extrusion force of the part is greater than the elastic force of the second spring 63, so that the part squeezes the sliding sleeve 62 to slide upward, and at this time, the extrusion bar 75 will contact one side of the force-bearing plate 66, and the force-bearing plate 66 is squeezed downward by the extrusion bar 75, and the force-bearing plate 66 drives the rotating knife 67 to swing, and the rotating knife 67 uses the short shaft 65 as a fulcrum, so that the lower end of the rotating knife 67 swings to the other side, so that the rotating knife 67 squeezes the plate to tear and deform; It should be particularly noted that the pressure relief valve 13 includes 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, and a round shaft is slidably connected inside the through groove. A slide plate is installed at the lower end of the round shaft, and the slide plate is connected to the nozzle 12 through a return spring.

[0029] Embodiment 3: This embodiment is an improvement made on the basis of embodiment 2. For details, please refer to Figure 1-Figure 4 The extrusion device 7 also includes a ring 71 sleeved on the outer surface of the cylinder 61, the ring 71 is connected to the cylinder 61 through a third spring 73, a vertical bar 72 is installed on one side of the 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.

[0030] Then, when the sliding sleeve 62 continues to slide upward, the force 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 plate 66, and the pressure relief valve 13 is squeezed by the force plate 66, so that the pressure relief valve 13 opens the lower end of the nozzle 12, so that the liquid at the nozzle 12 flows out to the tearing position of the plate; Subsequently, when the sleeve 62 continues to slide upward and the pressure relief valve 13 continues to squeeze the other side of the force-bearing plate 66, the pressure relief valve 13 will squeeze the other side of the force-bearing plate 66 to swing downward, so that the force-bearing plate 66 drives the rotating knife 67 to swing to the other side. The rotating knife 67 squeezes the torn notch of the plate to warp upward, thereby forming a gap between the warped part of the plate and the parts, so that a large amount of liquid flowing out of the nozzle 12 can be received, thereby increasing the connection area between the liquid and the plate body and the parts, thereby further improving the connection strength between the plate body and the parts.

[0031] Embodiment 4: This embodiment is an improvement made on the basis of embodiment 3. For details, please refer to Figure 1-Figure 4A jet device 8 is provided at one end of the rotating blade 67, and the jet device 8 is used to blow air to the plate body. The jet device 8 includes 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 cavity 83 is provided inside the cylinder 61 , a piston plate 84 is installed inside the piston cavity 83 , the upper end of the air pipe 82 is connected to the inside of the piston cavity 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 .

[0032] according to Figure 4 As shown, when the sheet squeezes the sleeve 62 to shrink inside the cylinder 61, the sleeve 62 compresses the second spring 63, and the sleeve 62 pushes the piston plate 84 to slide upward through the pull rod 85, and the piston plate 84 slides upward to extract the air at the air pipe 82 to the lower end of the piston plate 84 by the negative pressure, and then the liquid flowing out of the nozzle 12 reaches the gap between the raised part of the sheet and the part, and after the spot welding of the electrode column 3 is completed, when the electric push rod 2 drives the electrode column 3 to lift upward, the second spring 63 is used to push the sleeve 62 to slide downward, so that the sleeve 62 drives the pull rod 85 and the piston plate 84 to slide downward, and the piston plate 84 is used to squeeze the air at the lower end of the piston plate 84 to the air pipe 82, and the air is transmitted to the inclined hole 81 through the air pipe 82, so as to spray air through the inclined holes 81 set on both sides of the rotating knife 67, and the air is blown to the gap between the raised part of the sheet and the part and the spot welding part, so as to further accelerate the solidification of the liquid and the molten pool, thereby reducing the bending elastic force of the sheet to pull the sheet body and the part apart; It should be particularly noted that at this time, one side of the force-bearing plate 66 is rotationally connected to the adjustment groove 74 .

[0033] Embodiment 5: This embodiment is an improvement made on the basis of embodiment 4. For details, please refer to Figure 1-Figure 6 , the cylinder 61 is slidably connected to the electrode column 3; A buckle device 9 is provided inside the cylinder 61. The buckle device 9 includes a circular hole 93 and a vertical slot 94 provided inside the cylinder 61. The circular hole 93 is located at the upper end of the vertical slot 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. The vertical slot 94 is connected to the electrode column 3 via a fourth spring 96. The first spring 16 is installed at the upper end of the cylinder 61, and the cylinder 61 is connected to the electric push rod 2 through the first spring 16; 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; A push column 91 is installed on the other side of the clamping column 92. A vertical plate 14 is also installed at one end of the machine body 1. A protrusion 15 is installed on one side of the vertical plate 14. The protrusion 15 is used to squeeze the push column 91 to slide to one side.

[0034] according to Figure 5 and Figure 6 As shown, when the electrode column 3 drives the cylinder 61 downward, the rotating knife 67 squeezes the tearing notch of the plate and tilts upward, and then contacts the push column 91 through the protrusion 15, and the push column 91 and the clamping column 92 slide to the right end through the protrusion 15, so that the clamping column 92 slides into the inside of the cylinder 61. At this time, the push column 91 slides into the circular hole 93, and the cylinder 61 is pulled upward by the first spring 16, so that the push column 91 is slidably connected to the vertical groove 94, so that the extrusion knife 64 can quickly detach from the plate, so as to avoid the liquid at the tearing notch of the plate solidifying and adhering to the extrusion knife 64 when the electrode column 3 is spot welded, thereby improving the adhesion and solidification effect; Subsequently, when the electric push rod 2 continues to drive the electrode column 3 to slide upward and reset, the reset column 18 will abut against the cylinder 61. At this time, the clamping column 92 abuts against the inside of the cylinder 61. When the cylinder 61 slides downward by squeezing the reset column 18, the clamping column 92 will slide to the circular hole 93, thereby pushing the connecting plate 95 and the clamping column 92 to snap into the circular hole 93 through the fourth spring 96, so that the clamping column 92 can fix the cylinder 61 again.

[0035] Embodiment 6: The present invention also provides a welding method for a plate welding device: S1, place the part on the electrode plate 4, then place the plate on the part, 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, so the extrusion knife 64 will first contact the plate, and squeeze into the plate through 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, so that the plate is torn and deformed by the extrusion knife 64; S3, then the liquid is sprayed to the deformed part through the nozzle 12, and the liquid flows into the space between the part and the plate through the tearing part; S4, after executing S3, the uneven plate is flattened by pressing the squeezing bar 75 against the plate; S5. After executing S4, the plate is in contact through the electrode column 3, the electrode column 3 is energized, the electrode plate 4 conducts electricity to the part, and the plate is spot welded to the part through the electrode column 3. The high temperature at the spot welding point solidifies the liquid, thereby increasing the connection area between the plate and the part.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection 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); and 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 portion of the plate body.

2. The plate welding device according to claim 1, characterized in that: 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).

3. The plate welding device according to claim 1, characterized in that: 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 compress 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.

4. The plate welding device according to claim 2, characterized in that: 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).

5. The plate welding device according to claim 4, 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).

6. The plate welding device according to claim 5, 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).

7. The plate welding device according to claim 6, 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.

8. The plate welding device according to claim 6, 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.

9. The plate welding device according to claim 3, 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.

10. The welding method of the plate welding device according to claim 9, characterized in that: S1, placing a part on the electrode plate (4), then placing a plate 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, and squeeze into the plate through the extrusion knife (64); S2, subsequently rotating the rotary knife (67), and using the rotary knife (67) to drive the extrusion knife (64) to extrude the plate, so that the plate is torn and deformed by the extrusion knife (64); S3, then spraying liquid to the deformed part of the plate through the nozzle (12), and the liquid flows into the space between the part and the plate through the tearing part; S4, after executing S3, the uneven plate is flattened by pressing the squeezing bar (75) against the plate; S5. After executing S4, the plate is in contact with the electrode column (3), the electrode column (3) is energized, the electrode plate (4) conducts electricity to the part, and the plate is spot welded to the part through the electrode column (3). The high temperature at the spot welding point solidifies the liquid, thereby increasing the connection area between the plate and the part.

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