Automatic positioning and welding device for steel structure and using method of automatic positioning and welding device

Abstract

The invention relates to the field of fixing or positioning of workpieces during welding, in particular to an automatic positioning and welding device for a steel structure and a using method of the automatic positioning and welding device. The automatic positioning and welding device for the steel structure is characterized by comprising a bottom plate (1), supporting plates (102) are fixedly installed on the two sides of the top end of the bottom plate (1), the sides, close to each other, of the supporting plates (102) on the two sides are fixedly connected with a telescopic plate (103) through a telescopic mechanism (2), and a connecting base (104) is welded to the side, away from the telescopic mechanism (2), of the telescopic plate (103); a clamping mechanism (3) is arranged on the connecting base (104), a beating mechanism (4) is fixedly connected to the rear side of the top end of the bottom plate (1), a welding mechanism (5) is arranged in the middle of the top end of the bottom plate (1), and a controller (101) is further installed at the top end of the bottom plate (1). The device is convenient to use and improves the welding quality.

Description

Technical Field

[0001] The invention relates to the field of fixing or positioning a workpiece during welding, and in particular to an automatic positioning welding device for a steel structure and a use method thereof. Background Art

[0002] In metallurgical technical transformation projects, the welding of steel components at the construction site usually requires manual assembly and welding according to the use requirements. Manual welding is inefficient and costly, and the quality of manual joints is inevitably uneven, and the assembly dimensions cannot be accurately unified.

[0003] At present, there are many ways to weld steel components. The Chinese utility model patent with authorization announcement number 220636792U disclosed a welding device for processing steel structures on March 22, 2024. The workbench can be used to clamp and fix multiple steel structures to be welded at the same time, and the welding position of the steel structure can be located, so as to directly determine the shape of the steel structure after forming, so that the welded annular steel structure has higher accuracy, welding is more convenient and efficient, and this method is also convenient for automated welding robots to perform welding construction. However, after welding, the above device is not provided with a hammering mechanism, which is not convenient for judging the quality of the weld seam, and it is difficult to meet the needs of the staff, reducing the practicality of the device. Summary of the invention

[0004] In order to overcome the defects of the prior art and provide a positioning device which is easy to use and improves welding quality, the present invention discloses an automatic positioning welding device for steel structures and a method for using the same.

[0005] The present invention achieves the purpose of the invention through the following technical solutions: A steel structure automatic positioning welding device, characterized in that: it includes a base plate, support plates are fixedly installed on both sides of the top of the base plate, the sides of the support plates on both sides that are close to each other are fixedly connected to the telescopic plates through a telescopic mechanism, a connecting seat is welded on the side of the telescopic plate away from the telescopic mechanism, a clamping mechanism is arranged on the connecting seat, a hammering mechanism is fixedly connected to the rear side of the top of the base plate, a welding mechanism is arranged in the middle of the top of the base plate, and a controller is also installed on the top of the base plate.

[0006] The automatic positioning welding device for steel structure is characterized in that: the telescopic mechanism includes a fixed frame and a telescopic part, the fixed frame is provided with two groups, the two groups of fixed frames are respectively fixedly connected to the inner side of the support plate, the internal rotation of the fixed frame is connected with a threaded rod, the threads opened at both ends of the threaded rod have opposite rotation directions, and the two ends of the threaded rod are respectively threadedly connected with a first movable seat and a second movable seat, two groups of slide rails are fixedly installed on the inner side of the telescopic plate, baffles are welded at the front and rear ends of the slide rails, and the two ends of the outer surface of the slide rails are respectively slidably connected with a first sliding seat and a second sliding seat.

[0007] The automatic positioning welding device for steel structures is characterized in that two ends of one side of the telescopic member are respectively hinged to the inside of the first movable seat and the second movable seat, and two ends of the other side of the telescopic member are respectively hinged to the inside of the first sliding seat and the second sliding seat, and a guide rail is also fixedly connected to the inside of the fixed frame, and the first movable seat and the second movable seat are both slidably connected to the outer surface of the guide rail.

[0008] The automatic positioning welding device for steel structure is characterized in that one end of the two groups of threaded rods extends to the outside of the fixed frame and is fixedly installed with a rotating wheel. The two groups of rotating wheels are connected by a conveyor belt transmission. The middle part of the outer side of one group of rotating wheels is fixedly connected to the output end of the driving motor, and the driving motor is fixedly connected to the back of the support plate through a mounting piece.

[0009] The automatic positioning welding device for steel structure is characterized in that: the clamping mechanism comprises a first fixed block, a screw rod and a movable plate, two groups of first fixed blocks are fixedly connected at the upper and lower symmetrical positions of the outer side of the connecting seat, and the inner parts of the two groups of first fixed blocks are fixedly connected to the guide rod, two ends of the guide rod are welded with connecting plates, the middle part of the outer side of the connecting seat is rotatably connected with a rotating plate, the two ends of the outer surface of the guide rod are respectively slidably connected with a transmission plate and a movable plate, the two ends of the rotating plate are rotatably connected with connecting rods, and the ends of the two groups of connecting rods away from the rotating plate are respectively rotatably connected to the outer surfaces of the transmission plate and the movable plate, and the outer sides of the transmission plate and the movable plate are fixedly connected to the first clamping plate through connecting members, two groups of mounting seats are installed on the outer side of the first clamping plate, and electric push rods are arranged on the sides of the two groups of mounting seats away from each other, the output end of the electric push rod passes through the outer side wall of the mounting seat and is fixedly connected to the second clamping plate, and a plurality of groups of rubber soft disks are arranged on the inner side of the second clamping plate.

[0010] The automatic positioning welding device for steel structure is characterized in that: a second fixed block is fixedly connected to the outer side of the connecting seat, a screw rod is rotatably connected between the second fixed block and one of the connecting plates, the movable plate is threadedly connected to the surface of the screw rod, and a stepper motor is fixedly installed in the middle part of the outer side of one of the connecting plates, and one end of the screw rod is fixedly connected to the output end of the stepper motor.

[0011] The automatic positioning welding device for steel structure is characterized in that: the hammering mechanism includes a bracket, the bottom end of the bracket is welded to the bottom plate, the four corners of the bottom end of the horizontal plate of the bracket are fixedly connected to the hammer head through springs, both sides of the top end of the horizontal plate of the bracket are penetrated by through grooves, both sides of the inside of the through grooves are provided with limiting grooves, both sides of the top end of the hammer head are fixedly installed with tooth plates, the end of the tooth plate away from the hammer head penetrates the through groove and is fixedly connected to the limiting plate, both sides of the tooth plate are installed with limit blocks adapted to the limit grooves, and the limit blocks are slidably connected to the inside of the limit grooves.

[0012] The automatic positioning welding device for steel structure is characterized in that two groups of fixed plates are installed on both sides of the top of the bracket cross plate, a rotating shaft is rotatably connected between the two groups of fixed plates, a gear is fixedly connected to the middle of the outer surface of the rotating shaft, the gear is meshed with the gear plate, and one end of the rotating shaft is fixedly connected to the output end of the servo motor, and the servo motor is fixedly installed on the outside of the fixed plate.

[0013] The automatic positioning welding device for steel structure is characterized in that: the welding mechanism includes a third fixed block, the third fixed block is fixedly installed in the middle of the top end of the base plate, a screw is rotatably connected between the third fixed block and the bracket, a connecting rod is also fixedly connected between the third fixed block and the bracket, a movable plate is slidably connected to the outer surface of the connecting rod, and the movable plate and the screw are threadedly connected, an electric lifting rod is fixedly installed on the top end of the movable plate, the output end of the electric lifting rod is fixedly connected to the laser welding head, a transmission motor is installed on the outer side of the third fixed block, and one end of the screw is fixedly connected to the output end of the transmission motor.

[0014] The method for using the automatic positioning welding device for steel structures is characterized by comprising: S1: First, two sets of steel plates are clamped and fixed by the clamping mechanisms on both sides; S2: Secondly, the steel plates on both sides are driven closer to each other through the telescopic mechanisms on both sides, so that the welding surfaces of the two sets of steel plates are fitted together; S3: Then, the edge of the bottom welding surface is welded by a welding mechanism; S4: Finally, the two sets of steel plates are hammered by the hammering mechanism to observe whether they will fall off and judge the welding quality.

[0015] The present invention clamps and fixes two groups of steel plates by clamping mechanisms on both sides, and then drives the steel plates on both sides to approach each other by telescopic mechanisms on both sides, so that the welding surfaces of the two groups of steel plates are fitted, and then welds the edges of the bottom welding surfaces by the welding mechanism, and finally hammers the two groups of steel plates by the hammering mechanism to observe whether they will fall off and judge their welding quality.

[0016] The present invention provides a simple and practical automatic positioning welding device for steel components and a method for using the same. Firstly, it is convenient for metallurgical technical transformation projects to perform automatic welding at construction sites. Secondly, the welding quality can be checked in time through the hammering mechanism, thereby reducing the risk of welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention Figure 2 is a schematic diagram of the back structure of the present invention; Figure 3 It is a front view of the present invention Figure 4 It is a structural schematic diagram of the telescopic mechanism in the present invention Figure 5 It is a structural schematic diagram of the clamping mechanism in the present invention Figure 6 This is a schematic diagram of the structure of the first clamping plate in the present invention. Figure 7 It is a structural schematic diagram of the hammering mechanism in the present invention. Figure 8 The present invention Figure 7 Schematic diagram of the proposed enlarged structure at B Fig. 9 yes Figure 1 Schematic diagram of the local enlarged structure at point A in the middle.

[0018] The component names indicated by the reference numerals are as follows: 1: Bottom plate, 101: Controller, 102: support plate, 103: telescopic plate, 104: Connecting seat, 2: Telescopic mechanism, 201: fixed frame, 202: Threaded rod, 203: Guide rails, 204: First movable seat, 205: Second movable seat, 206: Slide rail, 207: Baffle, 208: first sliding seat, 209: Second sliding seat, 210: telescopic parts, 211: Wheel, 212: conveyor belt, 213: drive motor, 3: Clamping mechanism, 301: first fixed block, 302: Guide rod, 303: Connecting plate, 304: second fixed block, 305: screw rod, 306: movable board, 307: Stepper motor, 308: Transmission plate, 309: first clamping plate, 310: Rotating plate, 311: Connecting rod, 312: Mounting seat, 313: Electric push rod, 314: Second clamping plate, 315: Rubber floppy disk, 4: Beating mechanism, 401: Bracket, 402: Spring, 403: Hit the head, 404: tooth plate, 405: Through slot, 406: limit slot, 407: limit block, 408: Limiting plate, 409: Fixed plate, 410: shaft, 411: Gear, 412: Servo motor, 5: Welding mechanism, 501: the third fixed block, 502: screw, 503: Connecting rod, 504: Mobile board, 505: transmission motor, 506: Electric lift mast, 507: Laser welding head. DETAILED DESCRIPTION

[0019] The present invention is further described below by means of specific examples. Example

[0020] Please refer to Figure 1-9As shown, an automatic positioning welding device for steel structure comprises a base plate 1, support plates 102 are fixedly installed on both sides of the top of the base plate 1, the sides of the support plates 102 on both sides close to each other are fixedly connected to the telescopic plates 103 through the telescopic mechanism 2, a connecting seat 104 is welded on the side of the telescopic plate 103 away from the telescopic mechanism 2, a clamping mechanism 3 is arranged on the connecting seat 104, a hammering mechanism 4 is fixedly connected to the rear side of the top of the base plate 1, a welding mechanism 5 is arranged in the middle of the top of the base plate 1, and a controller 101 is also installed on the top of the base plate 1.

[0021] In this scheme, the two groups of steel plates are clamped and fixed by the clamping mechanisms 3 on both sides, and then the telescopic mechanisms 2 on both sides respectively drive the steel plates on both sides to approach each other, so that the welding surfaces of the two groups of steel plates are fitted together, and then the edges of the bottom welding surfaces are welded by the welding mechanism 5, and finally the two groups of steel plates are hammered by the hammering mechanism 4 to observe whether they will fall off and judge their welding quality. Example

[0022] Please refer to Figure 4 As shown, the telescopic mechanism 2 includes a fixed frame 201 and a telescopic member 210. The fixed frame 201 is provided with two groups. The two groups of fixed frames 201 are respectively fixedly connected to the inner side of the support plate 102. The internal rotation of the fixed frame 201 is connected with a threaded rod 202. The threads opened at both ends of the threaded rod 202 have opposite rotation directions, and the two ends of the threaded rod 202 are respectively threadedly connected with a first movable seat 204 and a second movable seat 205. Two groups of slide rails 206 are fixedly installed on the inner side of the telescopic plate 103. Baffles 207 are welded to the front and rear ends of the slide rails 206, and the two ends of the outer surface of the slide rails 206 are respectively slidably connected with a first sliding seat 208 and a second sliding seat 209.

[0023] Please refer to Figure 4 As shown, the two ends of one side of the telescopic member 210 are respectively hinged to the inside of the first movable seat 204 and the second movable seat 205, and the two ends of the other side of the telescopic member 210 are respectively hinged to the inside of the first sliding seat 208 and the second sliding seat 209. The interior of the fixed frame 201 is also fixedly connected to the guide rail 203, and the first movable seat 204 and the second movable seat 205 are both slidably connected to the outer surface of the guide rail 203.

[0024] Please refer to Figure 2 As shown, one end of the two groups of threaded rods 202 extends to the outside of the fixed frame 201 and is fixedly installed with a rotating wheel 211. The two groups of rotating wheels 211 are connected by a transmission belt 212. The middle part of the outer side of one group of rotating wheels 211 is fixedly connected to the output end of the driving motor 213, and the driving motor 213 is fixedly connected to the back of the support plate 102 through a mounting piece.

[0025] In this scheme, the working principle of the telescopic mechanism 2 is as follows: one group of the rotating wheels 211 is driven to rotate by the output end of the driving motor 213, and one group of the rotating wheels 211 drives another group of the rotating wheels 211 to rotate through the conveyor belt 212, so that the two groups of threaded rods 202 rotate synchronously, and then the first movable seat 204 and the second movable seat 205 approach or move away from each other, and the first sliding seat 208 and the second sliding seat 209 approach or move away from each other. When approaching, the telescopic member 210 is in an extended state, so that the distance between the clamping mechanisms 3 on both sides is reduced, and then the welding surfaces of the two groups of steel plates are fitted. When moving away, the telescopic member 210 is in a retracted state, so that the distance between the clamping mechanisms 3 on both sides is increased, and a baffle 207 is provided to prevent the first sliding seat 208 and the second sliding seat 209 from detaching from the slide rail 206. Example

[0026] Please refer to Figure 5 As shown, the clamping mechanism 3 includes a first fixed block 301, a screw rod 305 and a movable plate 306. Two groups of first fixed blocks 301 are fixedly connected at upper and lower symmetrical positions on the outer side of the connecting seat 104, and the interiors of the two groups of first fixed blocks 301 are fixedly connected to the guide rod 302. Both ends of the guide rod 302 are welded with connecting plates 303. The middle part of the outer side of the connecting seat 104 is rotatably connected with a rotating plate 310. The two ends of the outer surface of the guide rod 302 are slidably connected with a transmission plate 308 and a movable plate 306 respectively. Both ends of the rotating plate 310 are rotatably connected with a connecting rod 311, and the two groups of connecting rods 311 are rotatably connected. One end of the rod 311 away from the rotating plate 310 is rotatably connected to the outer surface of the transmission plate 308 and the movable plate 306, and the outer sides of the transmission plate 308 and the movable plate 306 are fixedly connected to the first clamping plate 309 through connecting parts. Two groups of mounting seats 312 are installed on the outer side of the first clamping plate 309. The two groups of mounting seats 312 are each provided with an electric push rod 313 on the side away from each other. The output end of the electric push rod 313 passes through the outer wall of the mounting seat 312 and is fixedly connected to the second clamping plate 314. A plurality of groups of rubber soft disks 315 are provided on the inner side of the second clamping plate 314.

[0027] Please refer to Figure 5 As shown, a second fixed block 304 is also fixedly connected to the outer side of the connecting seat 104, a screw rod 305 is rotatably connected between the second fixed block 304 and one of the connecting plates 303, a movable plate 306 is threadedly connected to the surface of the screw rod 305, and a stepper motor 307 is fixedly installed in the middle part of the outer side of one of the connecting plates 303, and one end of the screw rod 305 is fixedly connected to the output end of the stepper motor 307.

[0028] In this scheme, the working principle of the clamping mechanism 3 is as follows: the output end of the stepping motor 307 drives the screw rod 305 to rotate, so that the movable plate 306 moves, drives the rotating plate 310 and the two sets of connecting rods 311 to rotate synchronously, drives the movable plate 306 and the transmission plate 308 to approach each other, drives the first clamping plates 309 on both sides to approach each other, and can clamp the steel plate longitudinally. Secondly, the output ends of the electric push rods 313 on the upper and lower sides drive the two second clamping plates 314 to approach each other, and the rubber soft disk 315 squeezes the upper and lower surfaces of the steel plate to clamp the upper and lower surfaces of the steel plate. The rubber soft disk 315 increases the friction force and improves the clamping effect. Through the coordinated use of longitudinal clamping and vertical clamping, double clamping of the steel plate is achieved, and the fixing effect is good. Example

[0029] Please refer to Figure 7 and Figure 8 As shown, the hammering mechanism 4 includes a bracket 401, the bottom end of the bracket 401 is welded to the bottom plate 1, the four corners of the bottom end of the horizontal plate of the bracket 401 are fixedly connected to the hammer head 403 through springs 402, both sides of the top of the horizontal plate of the bracket 401 are penetrated with through grooves 405, and both sides of the inner part of the through groove 405 are provided with limiting grooves 406, and tooth plates 404 are fixedly installed on both sides of the top of the hammer head 403, and one end of the tooth plate 404 away from the hammer head 403 penetrates the through groove 405 and is fixedly connected with a limiting plate 408, and both sides of the tooth plate 404 are installed with limiting blocks 407 adapted to the limiting groove 406, and the limiting blocks 407 are slidably connected to the inside of the limiting groove 406.

[0030] Please refer to Figure 7 As shown, two groups of fixed plates 409 are installed on both sides of the top of the horizontal plate of the bracket 401, and a rotating shaft 410 is rotatably connected between the two groups of fixed plates 409. A gear 411 is fixedly connected to the middle of the outer surface of the rotating shaft 410, and the gear 411 is meshed with the gear plate 404. One end of the rotating shaft 410 is fixedly connected to the output end of the servo motor 412, and the servo motor 412 is fixedly installed on the outer side of the fixed plate 409.

[0031] In this scheme, the working principle of the hammering mechanism 4 is as follows: the output ends of the two groups of servo motors 412 are used to synchronously drive the two groups of rotating shafts 410 to rotate, so that the two groups of gears 411 rotate synchronously, driving the two groups of tooth plates 404 to move upward synchronously, and then the hammer head 403 moves upward, and the spring 402 is in a contracted state. Secondly, by simultaneously controlling the closing of the two groups of servo motors 412, under the action of the spring 402 restoring the deformation, the hammer head 403 is driven to move downward to hammer the steel plate, and by adjusting the different telescopic lengths of the spring 402, the hammer head 403 can be driven to perform impact tests of different intensities, meeting the needs of the staff, and the output end of the servo motor 412 in the present invention can also rotate freely without power, similar to the motor used in the electric fan in life, so as to observe whether the two groups of steel plates will fall off and judge their welding quality. Example

[0032] Please refer to Fig. 9 As shown, the welding mechanism 5 includes a third fixed block 501, which is fixedly installed in the middle of the top end of the base plate 1, and a screw 502 is rotatably connected between the third fixed block 501 and the bracket 401. A connecting rod 503 is also fixedly connected between the third fixed block 501 and the bracket 401. A movable plate 504 is slidably connected to the outer surface of the connecting rod 503, and the movable plate 504 and the screw 502 are threadedly connected. An electric lifting rod 506 is fixedly installed on the top of the movable plate 504, and the output end of the electric lifting rod 506 is fixedly connected to the laser welding head 507. A transmission motor 505 is installed on the outer side of the third fixed block 501, and one end of the screw 502 is fixedly connected to the output end of the transmission motor 505.

[0033] In this solution, the working principle of the welding mechanism 5 is as follows: the output end of the transmission motor 505 drives the screw 502 to rotate, so that the movable plate 504 reciprocates along the outer surface of the connecting rod 503, and the output end of the electric lifting rod 506 drives the laser welding head 507 to move upward, so as to realize the welding of the welding seam, which is convenient and quick.

[0034] The working principle and use process of this device: the present invention clamps and fixes two groups of steel plates through the clamping mechanisms 3 on both sides, and then drives the steel plates on both sides to approach each other through the telescopic mechanisms 2 on both sides, so that the welding surfaces of the two groups of steel plates are fitted, and then the edges of the bottom welding surfaces are welded through the welding mechanism 5, and finally the two groups of steel plates are hammered through the hammering mechanism 4 to observe whether they will fall off and judge their welding quality.

Claims

1. An automatic positioning welding device for steel structure, characterized by: The invention comprises a bottom plate (1), support plates (102) are fixedly mounted on both sides of the top of the bottom plate (1), the sides of the support plates (102) on both sides close to each other are fixedly connected to a telescopic plate (103) through a telescopic mechanism (2), a connecting seat (104) is welded to the side of the telescopic plate (103) away from the telescopic mechanism (2), a clamping mechanism (3) is arranged on the connecting seat (104), a hammering mechanism (4) is fixedly connected to the rear side of the top of the bottom plate (1), a welding mechanism (5) is arranged in the middle of the top of the bottom plate (1), and a controller (101) is also installed at the top of the bottom plate (1).

2. The automatic positioning welding device for steel structure according to claim 1, characterized in that: The telescopic mechanism (2) comprises a fixed frame (201) and a telescopic member (210). The fixed frame (201) is provided with two groups. The two groups of fixed frames (201) are respectively fixedly connected to the inner side of the support plate (102). The fixed frame (201) is rotatably connected to a threaded rod (202) inside. The threads provided at the two ends of the threaded rod (202) have opposite rotation directions. The two ends of the threaded rod (202) are respectively threadedly connected to a first movable seat (204) and a second movable seat (205). Two groups of slide rails (206) are fixedly installed on the inner side of the telescopic plate (103). Baffles (207) are welded to the front and rear ends of the slide rails (206). The two ends of the outer surface of the slide rails (206) are respectively slidably connected to a first sliding seat (208) and a second sliding seat (209).

3. The automatic positioning welding device for steel structure according to claim 2, characterized in that: Two ends of one side of the telescopic member (210) are respectively hinged inside the first movable seat (204) and the second movable seat (205), and two ends of the other side of the telescopic member (210) are respectively hinged inside the first sliding seat (208) and the second sliding seat (209), and the interior of the fixed frame (201) is also fixedly connected to a guide rail (203), and the first movable seat (204) and the second movable seat (205) are both slidably connected to the outer surface of the guide rail (203).

4. The automatic positioning welding device for steel structure according to claim 2, characterized in that: One end of the two groups of threaded rods (202) extends to the outside of the fixed frame (201) and is fixedly mounted with a rotating wheel (211). The two groups of rotating wheels (211) are connected to each other by a transmission belt (212). The middle part of the outer side of one group of rotating wheels (211) is fixedly connected to the output end of a driving motor (213). The driving motor (213) is fixedly connected to the back of the support plate (102) via a mounting member.

5. The automatic positioning welding device for steel structure according to claim 1, characterized in that: The clamping mechanism (3) comprises a first fixed block (301), a screw rod (305) and a movable plate (306); two groups of first fixed blocks (301) are fixedly connected at upper and lower symmetrical positions on the outer side of the connecting seat (104); the interiors of the two groups of first fixed blocks (301) are fixedly connected to the guide rod (302); both ends of the guide rod (302) are welded with connecting plates (303); a rotating plate (310) is rotatably connected to the middle part of the outer side of the connecting seat (104); a transmission plate (308) and a movable plate (306) are slidably connected to the two ends of the outer surface of the guide rod (302); both ends of the rotating plate (310) are rotatably connected to the connecting rod (311); and the two groups of One end of the connecting rod (311) away from the rotating plate (310) is rotatably connected to the outer surface of the transmission plate (308) and the movable plate (306), and the outer sides of the transmission plate (308) and the movable plate (306) are fixedly connected to the first clamping plate (309) through connecting pieces. Two groups of mounting seats (312) are installed on the outer side of the first clamping plate (309). The two groups of mounting seats (312) are each provided with an electric push rod (313) on the side away from each other. The output end of the electric push rod (313) passes through the outer wall of the mounting seat (312) and is fixedly connected to the second clamping plate (314). A plurality of groups of rubber soft disks (315) are provided on the inner side of the second clamping plate (314).

6. The automatic positioning welding device for steel structure according to claim 5, characterized in that: A second fixed block (304) is also fixedly connected to the outer side of the connecting seat (104); a screw rod (305) is rotatably connected between the second fixed block (304) and one of the connecting plates (303); the movable plate (306) is threadedly connected to the surface of the screw rod (305); and a stepper motor (307) is fixedly installed in the middle part of the outer side of one of the connecting plates (303); one end of the screw rod (305) is fixedly connected to the output end of the stepper motor (307).

7. The automatic positioning welding device for steel structure according to claim 1, characterized in that: The hammering mechanism (4) comprises a bracket (401), the bottom end of the bracket (401) is welded to the bottom plate (1), the four corners of the bottom end of the horizontal plate of the bracket (401) are fixedly connected to the hammer head (403) through springs (402), both sides of the top end of the horizontal plate of the bracket (401) are penetrated by through grooves (405), both sides of the inside of the through grooves (405) are provided with limiting grooves (406), both sides of the top end of the hammer head (403) are fixedly installed with tooth plates (404), one end of the tooth plate (404) away from the hammer head (403) penetrates the through groove (405) and is fixedly connected to the limiting plate (408), and both sides of the tooth plate (404) are installed with limiting blocks (407) adapted to the limiting grooves (406), and the limiting blocks (407) are slidably connected to the inside of the limiting grooves (406).

8. The automatic positioning welding device for steel structure according to claim 7, characterized in that: Two groups of fixed plates (409) are installed on both sides of the top of the horizontal plate of the bracket (401), and a rotating shaft (410) is rotatably connected between the two groups of fixed plates (409). A gear (411) is fixedly connected to the middle of the outer surface of the rotating shaft (410), and the gear (411) is meshed with the toothed plate (404), and one end of the rotating shaft (410) is fixedly connected to the output end of the servo motor (412), and the servo motor (412) is fixedly installed on the outer side of the fixed plate (409).

9. The automatic positioning welding device for steel structure according to claim 7, characterized in that: The welding mechanism (5) comprises a third fixed block (501), the third fixed block (501) is fixedly mounted at the middle of the top end of the bottom plate (1), a screw rod (502) is rotatably connected between the third fixed block (501) and the bracket (401), a connecting rod (503) is also fixedly connected between the third fixed block (501) and the bracket (401), a moving plate (504) is slidably connected to the outer surface of the connecting rod (503), and the moving plate (504) and the screw rod (502) are threadedly connected, an electric lifting rod (506) is fixedly mounted at the top end of the moving plate (504), an output end of the electric lifting rod (506) is fixedly connected to a laser welding head (507), a transmission motor (505) is mounted on the outer side of the third fixed block (501), and one end of the screw rod (502) is fixedly connected to the output end of the transmission motor (505).

10. The method for using the automatic positioning welding device for steel structure according to any one of claims 1 to 9, characterized in that: include: S1: First, two sets of steel plates are clamped and fixed by the clamping mechanisms (3) on both sides; S2: Secondly, the telescopic mechanisms (2) on both sides are used to drive the steel plates on both sides closer to each other, so that the welding surfaces of the two sets of steel plates are fitted together; S3: Then, the edge of the bottom welding surface is welded by the welding mechanism (5); S4: Finally, the two sets of steel plates are hammered by the hammering mechanism (4) to observe whether they fall off and to judge the welding quality.

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