CN113070367B

CN113070367B - Vehicle body sinking restoration spot welding drawing sleeve

Info

Publication number: CN113070367B
Application number: CN202110403048.7A
Authority: CN
Inventors: 吴元斌
Original assignee: Qingdao Baishifu Electric Co ltd
Current assignee: Qingdao Baishifu Electric Co ltd
Priority date: 2021-04-15
Filing date: 2021-04-15
Publication date: 2023-05-12
Anticipated expiration: 2041-04-15
Also published as: CN113070367A

Abstract

The utility model provides a car body is sunken to recover spot welding and draws suit, belongs to panel beating repair equipment field, concretely relates to car body is sunken to recover spot welding and draws suit. The welding machine is characterized by comprising an electric welding machine and a welding drawing assembly, wherein a welding gun or a welding tongs of the electric welding machine can be connected with the welding drawing assembly, and the welding drawing assembly comprises a lever-type pressing handle drawing piece, a fulcrum lever-type drawing piece and/or a meson welding drawing piece. The device can be convenient for repairing the metal plate concave, is light and easy to use, can particularly accurately control the welding time, ensures the accuracy of welding spots, and improves the repairing quality and efficiency; the invention can flexibly select the corresponding welding meson and drawing tool according to different concave shapes by modifying the structure of the drawing tool.

Description

Vehicle body sinking restoration spot welding drawing sleeve

Technical Field

The invention belongs to the field of metal plate repair equipment, and particularly relates to a vehicle body concave recovery spot welding drawing sleeve.

Background

When the automobile is impacted, the metal plate on the surface of the automobile body can deform, and the metal plate is as small as one pit and as large as one valley, so that the appearance of the automobile body can be influenced. The existing old-type sheet metal repair equipment is huge in machine body, complex in structure and difficult to overhaul once a fault occurs. The workers need to participate in special training and learning courses to master the operation process of the metal plate repairing technology, which is not beneficial to the popularization and application of the modern metal plate repairing technology. At present, a plurality of handheld portable sunken repairing machines exist on the market, the equipment is small in size and convenient to use. The principle is that an inserting sheet or a rod body of the iron medium is welded to a concave part, and then the concave part is pulled out and repaired to be flat by drawing the iron medium. However, the repairing machine has serious defects. For example, the welding time is difficult to control, generally, the welding is only required to be performed for 1.5-3 seconds, the non-skilled workers are difficult to accurately control, the improper operation often causes the welding area to be too large or inaccurate, and the positioning welding and leveling operation of the sharp recess are not facilitated. In addition, the design of the drawing tool also has problems such as poor universality, inconvenient use, and the like.

In view of the above, the applicant has designed the device, which can effectively solve the above technical problems, and simultaneously, the use is more convenient and safe, and the repair quality and efficiency are greatly improved.

Disclosure of Invention

The technical problem to be solved by the invention is to provide the vehicle body concave recovery spot welding drawing sleeve, which is convenient for repairing the sheet metal concave, light and easy to use, particularly can accurately control the welding time, ensures the accuracy of welding spots, and improves the repairing quality and efficiency; the second technical problem solved by the invention is that the structure of the drawing tool can be modified, and the corresponding welding meson and the drawing tool can be flexibly selected according to different concave shapes.

The invention solves the technical problems by adopting the following technical scheme: the utility model provides a suit is drawn in sunken recovery spot welding of automobile body, its characterized in that includes electric welding machine and welding drawing assembly, welding gun or welding tongs of electric welding machine can connect the welding drawing assembly, the welding drawing assembly is including pressing handle lever type drawing piece, fulcrum lever type drawing piece and/or meson welding type drawing piece.

Preferably, the electric welding machine comprises an electric control device, wherein the electric control device comprises a 220V power supply, an auxiliary power supply, a singlechip, a power supply circuit, a working circuit, a detection control circuit and a transformer, the power supply circuit is connected with the primary end of the transformer, the working circuit is connected with the secondary end of the transformer, the 220V power supply is connected with the power supply circuit, and the power supply circuit supplies power to the working circuit through the transformer; the auxiliary power supply is a 12V power supply and can supply power for the singlechip and the detection control circuit; the detection control circuit comprises a bidirectional thyristor alternating current switch, a current transformer, a rectifying circuit, a first integrated circuit, a second integrated circuit, a triode and a capacitor, wherein the bidirectional thyristor alternating current switch is connected in series in the power supply circuit, and the bidirectional thyristor switch is connected in parallel with the capacitor; the output end of the working circuit is connected with a welding gun or a welding clamp, and the grounding end of the working circuit is connected with a workpiece; the current transformer is connected with the first integrated circuit through the rectifying circuit, the output end of the first integrated circuit is in low level, the output end of the first integrated circuit is connected with the second integrated circuit through the triode, the second integrated circuit comprises a photosensitive diode and a coupling end, the photosensitive diode is connected with the singlechip, and the coupling end is connected with the control bidirectional thyristor switch;

when the 220V power supply is connected, 12V voltage is generated in the auxiliary power supply, only weak current exists in the capacitor, and weak voltage exists in the transformer, namely, the standby state is achieved; when a welding gun or a welding tongs are short-circuited with a workpiece and a grounding end through a welding drawing assembly, current passes through the current transformer, the current passes through the rectifying circuit and the first integrated circuit, the output end of the first integrated circuit is in a low level, the triode is conducted at the moment, then the photodiode in the second integrated circuit emits light, the coupling end of the second integrated circuit is conducted, the bidirectional thyristor alternating current switch is conducted, all voltages are applied to the primary end of the transformer, and the secondary end of the transformer generates low voltage meeting the requirement, so that the welding of the workpiece can be realized; wherein the singlechip can adjust and control the welding time.

Preferably, the pressing handle lever type drawing piece comprises a pressing handle support, the pressing handle support comprises a pressing handle bottom plate, a flexible rubber pad is arranged at the bottom of the pressing handle bottom plate, the lower ends of a left supporting rod and a right supporting rod are vertically and symmetrically arranged on the pressing handle bottom plate, a horizontally arranged mounting cross beam is fixed at the upper ends of the left supporting rod and the right supporting rod, a horizontally arranged holding rod is fixed at the lower end of the mounting cross beam, and the holding rod is perpendicular to the mounting cross beam; the upper part of the mounting cross beam is hinged with a fixed lever through a small supporting rod; an upper jack and a lower jack are respectively arranged at the front end of the lever and the front end of the holding rod; a lower spring type pulling rod is inserted and fixed in the upper jack and the lower jack;

the lower spring type drawing rod comprises a main rod body, wherein the main rod body is sequentially provided with a transverse handle part, a clamping part, a thread adjusting part, a perforation part, a spring part and a welding head part from top to bottom; the welding tongs can clamp the clamping part; the thread part comprises an external thread arranged on the outer peripheral wall of the main rod body, and an adjusting nut is sleeved on the external thread; the punching part is inserted into the upper jack and the lower jack, the spring part is positioned below the lower jack, the abutting spring is sleeved on the spring part, the upper end of the abutting spring abuts against the mounting cross beam, and the lower end of the abutting spring abuts against the welding head part; the horn is conical.

Preferably, the pressing handle bottom plate is a circular plate body with at least two welding round holes or two split long square plates.

Preferably, the fulcrum lever type drawing piece comprises an arc-shaped or horseshoe-shaped bottom plate support, a flexible rubber pad is arranged at the bottom of the bottom plate support, the lower end of a supporting rod is fixedly arranged at the upper part of the bottom plate support, one end of a cantilever is fixedly arranged at the upper end of the supporting rod, and a cantilever jack is formed at the other end of the cantilever; a spring type pulling rod is inserted into the cantilever jack;

the upper spring type drawing rod comprises a main rod body, a clamping part, a spring part and a welding head part are sequentially arranged on the main rod body from top to bottom, and the clamping part can clamp and connect welding tongs; an upper baffle ring is arranged at the joint of the clamping part and the spring part, and a lower baffle ring is arranged at the lower end of the spring part; the spring part comprises a propping spring, the propping spring is sleeved on the main rod body, the upper end of the propping spring is propped against the upper baffle ring, and the lower end of the propping spring is propped against the cantilever; the lower baffle ring is positioned below the cantilever; the horn is conical.

Preferably, the device further comprises a plug-in part, a connecting bolt is arranged above the clamping part, a bolt hole is formed in the lower end of the plug-in part, and the plug-in part is arranged on the connecting bolt of the clamping part through the bolt hole; the insertion part can be inserted into a gun hole of the welding gun.

Preferably, the meson welding type drawing piece comprises a main rod body, wherein a transverse handle part and a clamping part are arranged at the upper part of the main rod body, and a welding head part is arranged at the lower part of the main rod body; the welding head part is conical, truncated cone-shaped, flat head-shaped or inverted U-shaped; the meson welding type drawing piece can be fixedly connected with an iron meson.

Preferably, a pulling hammer part is further arranged between the clamping part and the welding head part of the meson welding type drawing piece, the pulling hammer part comprises an upper baffle ring, a lower baffle ring and a counterweight sliding block, the main rod body at the lower part of the clamping part is sleeved with the upper baffle ring, and the main rod body at the upper part of the welding head part is sleeved with the lower baffle ring; the counterweight sliding block is sleeved on the main rod body through the sliding hole and is positioned between the upper baffle ring and the lower baffle ring.

Preferably, the iron meson comprises the following structural types:

a. the iron meson is sheet-shaped, a pull hole is formed in the iron meson, and a strip-shaped welding sheet is arranged at the lower end of the iron meson; at this time, the welding head of the meson welding type drawing piece is in a reverse U shape with a slot, and the sheet iron meson can be inserted into the slot of the welding head;

b. the iron meson is in a wavy line shape; at this time, the welding head of the meson welding type drawing piece is conical, truncated cone-shaped or flat head-shaped.

Preferably, the device also comprises a drawing meson fixing device, wherein the drawing meson fixing device comprises a hook connector, a multi-claw drag hook connector and a straight rod pulling rod.

The beneficial effects of the invention are as follows:

1. the working principle of the invention is that an iron meson is arranged on an anode copper head or a cathode copper head, the iron meson is contacted with a concave part of a metal plate, after a power supply is started, the iron meson and the metal plate are fused and welded together by utilizing high resistance generated when low-voltage and high-intensity current flows through the iron meson and the concave part of the metal plate, and then the iron meson is pulled to flatten the concave part outwards, thereby achieving the purpose of recovering the metal plate. In the repairing process, the metal plate has a small heating range, the metal is not easy to deform, and the resetting effect is good. The key point of the method is that the control of the welding position duration is easy to miss the optimal time for starting and stopping welding in the welding process, so that the operation quality is reduced. The invention has the innovation points that the welding time is accurately controlled by the singlechip, the operation quality is not affected by the technical proficiency of operators, and the applicability is better; in addition, in the standby state, the current is small in time consumption, and the power supply can be saved; under the operation state of frequent start-stop use, the welding equipment can be protected, and the service life is prolonged.

2. Through reforming transform the structure that the subassembly was drawn in the welding, especially designed pressure handle lever type and drawn the piece and fulcrum lever type and drawn the piece, not only can support welding set through exquisite structure, can also realize lever type exquisite application of force, cooperation iron meson welded fastening depressed part that corresponds to draw the reset fast.

3. When the concave is a sharp pit or a small dent, the iron meson is sheet-shaped, a pulling hole is formed in the iron meson, correspondingly, a sheet-shaped slot is formed in the meson fixing device for welding, the sheet-shaped iron meson can be inserted into the slot, and the sharp point or the short line on the sheet-shaped iron meson is matched with the sharp pit or the small dent, so that the iron meson and the concave are conveniently combined together in a seamless mode. Similarly, when the concave pit is a round pit, the iron meson is designed to be a round head nail, and the arc surface of the nail head is matched with the concave round pit; when the concave is a linear valley, the iron meson is in a wavy line shape, the meson fixing device for welding is in a pointed rod shape, and the meson fixing device for welding can weld the wave crests of the wavy line together along the linear valley one by one, and finally the iron meson is pulled out after being completely attached to the valley. According to the different sunken shapes of the metal plate, the iron meson can be designed into different shapes, so that the iron meson and the iron meson are completely matched and welded together and then pulled out, and the metal plate is flexible and convenient to use.

4. The invention has simple structure, is suitable for practicality, has lower production cost and is suitable for popularization in industry.

Drawings

Fig. 1 is a schematic structural view of a lever-type pulling member of a pressing handle;

FIG. 2 is a schematic view of the structure of the press handle base plate (circular plate body);

fig. 3 is a schematic structural view of a pressing handle base plate (two long square plates);

fig. 4 is a schematic structural view of the fulcrum lever type drawing member (with a grip attached);

fig. 5 is a schematic structural view of the fulcrum lever type drawing member;

fig. 6 is a schematic diagram of a connection structure of the fulcrum lever type drawing member and the welding gun;

FIG. 7 is a schematic view of the structure of the floor stand;

FIG. 8 is a schematic structural view of a meson-welded drawing member (the horn is "U" -shaped);

FIG. 9 is a schematic view of a structure of a meson-welded drawing member (horn portion in the form of a flat head);

fig. 10 is a schematic structural view of a meson welded drawing member (the welding head is in a truncated cone shape);

FIG. 11 is a schematic view of the structure of a meson-welded drawing member (horn portion is conical);

FIG. 12 is a schematic structural view of a meson-welded drawing member (with a pull hammer);

FIG. 13 is a schematic view of the work holding state of the welding tongs;

fig. 14 is a schematic structural view of a ferrous meson (sheet structure one);

fig. 15 is a schematic structural view of a ferrous meson (sheet structure two);

fig. 16 is a schematic view of the structure of a ferrous meson (wavy line type);

FIG. 17 is a schematic view of a multi-jaw retractor connector;

FIG. 18 is a schematic view of a welding bug;

FIG. 19 is a schematic diagram of the circuit configuration of the electronic control device;

in the figure: 1. a transverse handle portion; 2. a clamping part; 3. a thread adjusting part; 4. a perforated portion; 5. an upper jack; 6. a lever; 7. a lower jack; 8. a grip; 9. a spring part; 10. a spring is abutted tightly; 11. a welding head part; 12. pressing a handle bottom plate; 13. a left strut; 14. mounting a cross beam; 15. a small support rod; 16. a flexible rubber pad; 17. welding the round hole; 18. a grip portion; 19. a clamping part; 20. a spring is abutted tightly; 21. a spring part; 22. a welding head part; 23. a base plate support; 24. a support rod; 25. a cantilever; 26. a welding gun; 27. a transverse handle portion; 28. a clamping part; 29. a main rod body; 30. a welding head part; 31. an upper baffle ring; 32. a counterweight slide block; 33. an upper baffle ring; 34. welding tongs; 35. iron meson; 36. a multi-jaw retractor connector; 37. an electric welding machine; 38. 220V power supply; 39. an auxiliary power supply; 40. a single chip microcomputer; 41. a photodiode; 42. a second integrated circuit; 43. a coupling end; 44. a bidirectional thyristor ac switch; 45. a capacitor; 46. a primary side of the transformer; 47. welding gun or welding tongs; 48. a secondary side of the transformer; 49. a workpiece and a grounding end; 50. a current transformer; 51. a rectifying circuit; 52. a first integrated circuit; 53. a triode.

Detailed Description

The invention is described in further detail below with reference to the drawings and the detailed description.

The invention discloses a vehicle body concave recovery spot welding drawing sleeve, which comprises an electric welding machine and a welding drawing assembly, wherein a welding gun or a welding tongs of the electric welding machine can be connected with the welding drawing assembly, and the welding drawing assembly comprises a lever-type pressing handle drawing piece, a fulcrum lever-type drawing piece and/or a meson welding drawing piece.

Example 1

As shown in fig. 1, the lever-type pulling piece for the pressing handle comprises a pressing handle support, the pressing handle support comprises a pressing handle bottom plate, a flexible rubber pad is arranged at the bottom of the pressing handle bottom plate, the lower ends of a left supporting rod and a right supporting rod are vertically and symmetrically arranged on the pressing handle bottom plate, a horizontally arranged mounting cross beam is fixed at the upper ends of the left supporting rod and the right supporting rod, a horizontally arranged holding rod is fixed at the lower end of the mounting cross beam, and the holding rod is perpendicular to the mounting cross beam; the upper part of the mounting cross beam is hinged with a fixed lever through a small supporting rod; an upper jack and a lower jack are respectively arranged at the front end of the lever and the front end of the holding rod; and the lower spring type pulling rod is fixedly inserted into the upper jack and the lower jack.

As shown in fig. 2 and 3, the bottom plate of the pressing handle is a circular plate body with at least two welding round holes or a split two-piece rectangular plate shape.

When the welding clamp is used, the pressing handle bottom plate is firstly placed on the side face of the metal plate recess, the adjusting nut is rotated according to the recess depth to adjust the penetration depth of the welding head until the welding head is contacted with the metal plate recess, the welding clamp is used for clamping the clamping part, then the electric welding machine is started to enable the welding head to be welded with the bottom of the recess, the overhanging end of the lever is manually pressed, the welding head and the bottom of the recess are pulled up together by utilizing the lever force until the recess is leveled, and the welding point is broken off to the side face and then ground flat.

Example two

As shown in fig. 4, 5, 6 and 7, in this embodiment, the fulcrum lever type drawing member includes an arc-shaped or horseshoe-shaped bottom plate support, a flexible rubber pad is disposed at the bottom of the bottom plate support, a lower end of a supporting rod is fixedly disposed at the upper part of the bottom plate support, one end of a cantilever is fixed at the upper end of the supporting rod, and a cantilever jack is disposed at the other end of the cantilever; a spring type pulling rod is inserted into the cantilever jack.

The connecting bolt is arranged above the clamping part, the bolt hole is formed in the lower end of the inserting part, and the inserting part can be arranged on the connecting bolt of the clamping part through the bolt hole; the insertion part can be inserted into a gun hole of the welding gun. Still include the portion of gripping, offer the bolt hole in the lower extreme of portion of gripping, the portion of gripping can be installed on the connecting bolt of clamping part through the bolt hole.

When the welding gun is used, firstly, the gun hole of the welding gun is aligned and inserted on the insertion part, or the welding tongs are clamped on the clamping part; pressing the main rod body downwards, and after overcoming the resistance of the abutting spring, enabling the lower end of the welding head part to touch the bottom of the metal plate depression; starting the welding machine to weld the welding head and the bottom of the recess together. And removing the downward pressure, and pulling the concave to rebound by the welding head under the action of the elasticity of the abutting spring. When the concave is leveled, the welding spots are broken off to the side face and then ground flat.

Example III

In this embodiment, as shown in fig. 8-11, the meson welding type drawing member includes a main rod body, a transverse handle portion and a clamping portion are disposed at an upper portion of the main rod body, and a welding head portion is disposed at a lower portion of the main rod body; the welding head part is conical, truncated cone-shaped, flat head-shaped or inverted U-shaped; the meson welding type drawing piece can be fixedly connected with an iron meson.

As shown in fig. 12, a pull hammer is further arranged between the clamping part and the welding head part of the meson welding type drawing piece, the pull hammer comprises an upper baffle ring, a lower baffle ring and a counterweight sliding block, the main rod body at the lower part of the clamping part is sleeved with the upper baffle ring, and the main rod body at the upper part of the welding head part is sleeved with the lower baffle ring; the counterweight sliding block is sleeved on the main rod body through the sliding hole and is positioned between the upper baffle ring and the lower baffle ring.

The iron meson comprises the following structural types:

a. as shown in fig. 14 and 15, the iron meson is sheet-shaped, a pulling hole is formed in the iron meson, and a strip-shaped welding sheet is arranged at the lower end of the iron meson; at this time, the welding head of the meson welding type drawing piece is in a reverse U shape with a slot, and the sheet iron meson can be inserted into the slot of the welding head; the flaky iron meson is suitable for repairing single-point or regional pits.

b. As shown in fig. 16, the iron meson is in a wavy line shape; at this time, the welding head of the meson welding type drawing piece is conical, truncated cone-shaped or flat head-shaped.

The drawing meson fixing device comprises a hook connector, a multi-claw drag hook connector (shown in figure 17) and a straight rod pulling rod.

When the flaky iron meson is used singly or in a plurality of modes, the flaky iron meson can be suitable for single-point concave repair of metal plates or regional concave repair of metal plates. The welding head with the slot in the shape of the U is inserted into the sheet iron meson, then the strip-shaped soldering lug of the iron meson is contacted with the bottom of the concave, then the welding pliers are clamped at the clamping part of the meson welding drawing piece, the electric welding machine is started, the sheet iron meson is welded in the concave, after the welding of the single sheet iron meson or the sheet iron meson is completed, the drawing hole of the single sheet iron meson is drawn through the hook connector, or for example, the straight rod drawing rod is inserted into the drawing holes of a plurality of sheet iron mesons in a penetrating way, and the concave can be leveled by drawing the hook connector or the straight rod drawing rod. And then breaking the welding spot part off, and grinding the welding spot part to be flat.

The wavy linear iron meson is suitable for repairing linear depressions, the trough parts of the wavy linear iron meson can be welded point by point along the bottoms of the linear depressions through meson welding type drawing pieces with conical, round table or flat head welding heads, and then the wavy linear iron meson is lifted upwards by using a multi-claw drag hook connector, so that the depressions can be leveled. And then breaking the welding spot part off, and grinding the welding spot part to be flat.

Example IV

As shown in fig. 18 and 19, in this embodiment, the electric welding machine includes an electric control device, where the electric control device includes a 220V power supply, an auxiliary power supply, a single chip microcomputer, a power supply circuit, a working circuit, a detection control circuit, and a transformer, the power supply circuit is connected to a primary end of the transformer, the working circuit is connected to a secondary end of the transformer, the 220V power supply is connected to the power supply circuit, and the power supply circuit supplies power to the working circuit through the transformer; the auxiliary power supply is a 12V power supply and can supply power for the singlechip and the detection control circuit; the detection control circuit comprises a bidirectional thyristor alternating current switch, a current transformer, a rectifying circuit, a first integrated circuit, a second integrated circuit, a triode and a capacitor, wherein the bidirectional thyristor alternating current switch is connected in series in the power supply circuit, and the bidirectional thyristor switch is connected in parallel with the capacitor; the output end of the working circuit is connected with a welding gun or a welding clamp, and the grounding end of the working circuit is connected with a workpiece; the current transformer is connected with the first integrated circuit through the rectifying circuit in series, the output end of the first integrated circuit is in low level, the output end of the first integrated circuit is connected with the second integrated circuit through the triode, the second integrated circuit comprises a photosensitive diode and a coupling end, the photosensitive diode is connected with the singlechip, and the coupling end is connected with a control bidirectional thyristor switch.

The other structures of this embodiment are the same as those of the first, second, third or fourth embodiments, and will not be described again.

It should be noted that the above-mentioned embodiments are only preferred examples of the present invention, and any equivalent or similar substitution will fall within the protection scope of the present invention for those skilled in the art without departing from the working principles of the present invention.

Claims

1. The utility model provides a suit is drawn in sunken recovery spot welding of automobile body, its characterized in that includes electric welding machine and welding drawing subassembly, welding gun or soldering pliers of electric welding machine can connect the welding drawing subassembly, the welding drawing subassembly includes lever-type drawing piece of pressing handle and/or fulcrum lever-type drawing piece and/or meson welding drawing piece; the fulcrum lever type drawing piece comprises an arc-shaped or horseshoe-shaped bottom plate support, a flexible rubber pad is arranged at the bottom of the bottom plate support, the lower end of a supporting rod is fixedly arranged at the upper part of the bottom plate support, one end of a cantilever is fixedly arranged at the upper end of the supporting rod, and a cantilever jack is formed at the other end of the cantilever; a spring type pulling rod is inserted into the cantilever jack; the upper spring type drawing rod comprises a main rod body, a clamping part, a spring part and a welding head part are sequentially arranged on the main rod body from top to bottom, and the clamping part can clamp and connect welding tongs; an upper baffle ring is arranged at the joint of the clamping part and the spring part, and a lower baffle ring is arranged at the lower end of the spring part; the spring part comprises a propping spring, the propping spring is sleeved on the main rod body, the upper end of the propping spring is propped against the upper baffle ring, and the lower end of the propping spring is propped against the cantilever; the lower baffle ring is positioned below the cantilever; the welding head part is conical;

the electric welding machine comprises an electric control device, wherein the electric control device comprises a 220V power supply, an auxiliary power supply, a singlechip, a power supply circuit, a working circuit, a detection control circuit and a transformer, the power supply circuit is connected with the primary end of the transformer, the working circuit is connected with the secondary end of the transformer, the 220V power supply is connected with the power supply circuit, and the power supply circuit supplies power to the working circuit through the transformer; the auxiliary power supply is a 12V power supply and can supply power for the singlechip and the detection control circuit; the detection control circuit comprises a bidirectional thyristor alternating current switch, a current transformer, a rectifying circuit, a first integrated circuit, a second integrated circuit, a triode and a capacitor, wherein the bidirectional thyristor alternating current switch is connected in series in the power supply circuit, and the bidirectional thyristor switch is connected in parallel with the capacitor; the output end of the working circuit is connected with a welding gun or a welding clamp, and the grounding end of the working circuit is connected with a workpiece; the current transformer is connected with the first integrated circuit through the rectifying circuit in series, the output end of the first integrated circuit is in low level, the output end of the first integrated circuit is connected with the second integrated circuit through the triode, the second integrated circuit comprises a photosensitive diode and a coupling end, the photosensitive diode is connected with the singlechip, and the coupling end is connected with a control bidirectional thyristor switch.

2. The vehicle body dent recovery spot welding drawing sleeve according to claim 1, wherein when a 220V power supply is connected, 12V voltage is generated in an auxiliary power supply, only weak current exists in a capacitor, and a weak voltage exists in a transformer, namely, the standby state is achieved; when a welding gun or a welding tongs are short-circuited with a workpiece and a grounding end through a welding drawing assembly, current passes through the current transformer, the current passes through the rectifying circuit and the first integrated circuit, the output end of the first integrated circuit is in a low level, the triode is conducted at the moment, then the photodiode in the second integrated circuit emits light, the coupling end of the second integrated circuit is conducted, the bidirectional thyristor alternating current switch is conducted, all voltages are applied to the primary end of the transformer, and the secondary end of the transformer generates low voltage meeting the requirement, so that the welding of the workpiece can be realized; wherein the singlechip can adjust and control the welding time.

3. The vehicle body dent recovery spot welding drawing sleeve set according to claim 1, wherein the pressing handle lever type drawing piece comprises a pressing handle support, the pressing handle support comprises a pressing handle bottom plate, a flexible rubber pad is arranged at the bottom of the pressing handle bottom plate, the lower ends of a left supporting rod and a right supporting rod are vertically and symmetrically arranged on the pressing handle bottom plate, a horizontal installation cross beam is fixed at the upper ends of the left supporting rod and the right supporting rod, a horizontal holding rod is fixed at the lower end of the installation cross beam, and the holding rod is vertical to the installation cross beam; the upper part of the mounting cross beam is hinged with a fixed lever through a small supporting rod; an upper jack and a lower jack are respectively arranged at the front end of the lever and the front end of the holding rod; a lower spring type pulling rod is inserted and fixed in the upper jack and the lower jack;

4. The vehicle body dent recovery spot welding drawing set as set forth in claim 3, wherein the pressing handle bottom plate is a circular plate body with at least two welding round holes or a split two-piece rectangular plate shape.

5. The vehicle body dent recovery spot welding drawing sleeve set according to claim 1, further comprising a plug part, wherein a connecting bolt is arranged above the clamping part, a bolt hole is arranged at the lower end of the plug part, and the plug part is arranged on the connecting bolt of the clamping part through the bolt hole; the insertion part can be inserted into a gun hole of the welding gun.

6. The vehicle body concave recovery spot welding drawing set of claim 1, wherein the meson welding drawing piece comprises a main rod body, a transverse handle part and a clamping part are arranged at the upper part of the main rod body, and a welding head part is arranged at the lower part of the main rod body; the welding head part is conical, truncated cone-shaped, flat head-shaped or inverted U-shaped; the meson welding type drawing piece can be fixedly connected with an iron meson.

7. The vehicle body dent recovery spot welding drawing sleeve set according to claim 6, wherein a drawing hammer part is further arranged between the clamping part and the welding head part of the meson welding drawing piece, the drawing hammer part comprises an upper baffle ring, a lower baffle ring and a counterweight sliding block, the main rod body at the lower part of the clamping part is sleeved with the upper baffle ring, and the main rod body at the upper part of the welding head part is sleeved with the lower baffle ring; the counterweight sliding block is sleeved on the main rod body through the sliding hole and is positioned between the upper baffle ring and the lower baffle ring.

8. The vehicle body dent recovery spot welding drawing kit of claim 7, wherein said iron meson comprises the following structural types:

9. The vehicle body dent recovery spot welding drawing kit of claim 8, further comprising a drawing meson fixture comprising a hook connector, a multi-jaw drag hook connector, and a straight bar pull rod.