Automatic welding tool for large plate beam of boiler steel structure

Abstract

The utility model discloses a kind of automatic welding tool of boiler steel structure large plate girder, including support roller, auxiliary mechanism, adjusting mechanism, clamping mechanism;Support roller is equipped with several, is fixed on ground evenly;Auxiliary mechanism is equipped with two groups, respectively installed in support roller both sides, adjusting mechanism is installed in one side of auxiliary mechanism, clamping mechanism is connected on adjusting mechanism, the side of auxiliary mechanism away from adjusting mechanism is equipped with welding robot;Auxiliary mechanism includes moving seat, support seat, gyro wheel, arc support plate, support frame, two-way threaded rod, guide rod, motor I;Support frame is fixed on ground, two-way threaded rod is rotatably connected in the both ends of support frame by bearing;Guide rod is equipped with a pair.The utility model can improve the flexibility of large plate girder overturning, realize welding to large plate girder bottom;Angle of clamping plate can be adjusted, to facilitate positioning and welding to oblique rib plate;It is convenient to feed rib plate, oblique rib plate on outside.

Description

Technical Field

[0001] This utility model belongs to the field of boiler steel structure large plate beam welding technology, and specifically relates to an automated welding fixture for boiler steel structure large plate beams. Background Technology

[0002] A power plant boiler is a medium-to-large-sized boiler used in power plants for generating electricity. Its internal steel structure beams are large in volume and weight, and are generally produced in sections. Welding fixtures are then used to assemble the various components to facilitate manufacturing and transportation. However, in the existing assembly and welding process of the beams, it is not possible to quickly position and weld the stiffening plates on the side walls of the beams.

[0003] A search revealed a welding fixture for a large steel structure girder of a power plant boiler, with existing technology announcement number CN213080582U. This fixture includes two steel plates placed on a base plate. A motor is fixedly installed inside the base plate, and two pull ropes are fixedly connected to the drive end of the motor via a winding roller. Each pull rope has a fixed block at its end, and both fixed blocks are mounted on the base plate via a sliding mechanism. Spring ropes are fixedly installed between the two fixed blocks and the base plate. Two uprights are fixedly installed on each of the two fixed blocks via a moving plate. Each upright has a lifting mechanism, and a spring rod is fixedly installed on each upright via a top plate. A pressure plate is fixedly installed at the bottom of each spring rod, and a rolling mechanism is installed on the upright. However, this fixture has the following drawback: it cannot perform positioning welding on the stiffening plates on the side walls of the large girder.

[0004] A search revealed a welding device for stiffening ribs of large plate beams used in boiler steel structure connections, with existing technology announcement number CN220636842U. This device includes a fixed frame, a mounting frame, an adjusting mechanism, an adjusting arm, and a clamping mechanism. The fixed frame supports the mounting frame, adjusting mechanism, adjusting arm, and clamping mechanism. A pair of mounting frames are located on both sides of the fixed frame; a pair of adjusting mechanisms are located on the mounting frames on both sides; a pair of adjusting arms are located on the adjusting mechanisms on the mounting frames; and a pair of clamping mechanisms are located at one end of the adjusting arms on both sides. The clamping mechanism includes a fixed base, a motor X, a rotating shaft III, an L-shaped fixed plate, a clamping plate, an electric push rod, and an anti-slip pad. Support plates I and II are located on both sides of the fixed frame, along with a power mechanism. However, this device has the following drawbacks: the adjusting mechanism and adjusting arm are always positioned above the large plate beam and extend to the other side of the large plate beam, making it inconvenient to feed stiffening ribs I and II. Summary of the Invention

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide an automated welding fixture for boiler steel structure large plate beams. The auxiliary mechanism can improve the flexibility of the large plate beam flipping and realize the welding of the bottom of the large plate beam; the clamping mechanism can adjust the angle of the clamping plate, thereby facilitating the positioning and welding of the diagonal stiffening plates; the support arm drives the clamping mechanism to rotate, thereby rotating the clamping mechanism to the outside of the large plate beam, facilitating the loading of the outer stiffening plates and diagonal stiffening plates; the adjustable plate can adjust the position of the clamping mechanism, thereby placing the stiffening plates and diagonal stiffening plates in the corresponding positions.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] An automated welding fixture for boiler steel structure large plate beams includes support rollers, auxiliary mechanisms, adjustment mechanisms, and clamping mechanisms. Several support rollers are evenly fixed on the ground. Two sets of auxiliary mechanisms are installed on both sides of the support rollers. An adjustment mechanism is installed on one side of the auxiliary mechanism. The clamping mechanism is connected to the adjustment mechanism. A welding robot is installed on the side of the auxiliary mechanism away from the adjustment mechanism.

[0008] The auxiliary mechanism includes a movable seat, a support seat, rollers, an arc-shaped support plate, a support frame, a bidirectional threaded rod, a guide rod, a motor I, and a bellows cover. The support frame is fixed to the ground, and the bidirectional threaded rod is rotatably connected to both ends of the support frame via bearings. A pair of guide rods are provided, symmetrically fixed to the support frames on both sides of the bidirectional threaded rod. Motor I is fixed to the support frame, and its output end is connected to one end of the bidirectional threaded rod. A pair of movable seats are provided, passing through the guide rods and symmetrically connected to the reverse threads of the bidirectional threaded rod via threads. A pair of support seats are provided, fixedly installed on the corresponding movable seats. Two sets of rollers are provided, each set having several evenly rotatably connected to the support seats, and the arc-shaped support plate overlaps the outer wall of the rollers. The arc-shaped support plate has a placement groove, and the large plate beam wing plate is movably connected in the placement groove. A telescopic bellows cover is provided on the outside of the bidirectional threaded rod.

[0009] The adjustment mechanism includes a platform, guide rail, column, support arm, adjustment plate, electric push rod II, and screw jack. The guide rail is installed on the ground on one side of the auxiliary mechanism. The transport carrier is movably installed on the guide rail and has wheels and a motor on it. Several wheels are provided, rotatably connected to the transport carrier and movably installed on the guide rail. The motor is fixed to the transport carrier and connected to the wheels. The column is fixed to the transport carrier, and the screw jack is fixed to the column. The support arm is connected to the top of the screw jack. The column is movably connected to the guide rail, and the support arm is connected to the end of the column away from the guide rail. The support arm has a moving groove and is hollow inside. The electric push rod II is fixed inside the support arm, and the adjustment plate is movably connected to the moving groove of the support arm. The output end of the electric push rod II passes through the side wall of the support arm and connects to the adjustment plate.

[0010] A rotating mechanism is provided between the screw jack and the support arm; the rotating mechanism includes a protective cover, a rotating shaft, gear I, a motor II, and gear II; the protective cover is fixed to the screw jack; the rotating shaft is rotatably connected to the protective cover, the support arm is located above the protective cover and connected to the rotating shaft, and gear I is provided on the rotating shaft; motor II is fixed to the protective cover, and gear II is provided on the output shaft of motor II; gear I meshes with gear II; gear I and gear II are located inside the protective cover.

[0011] The clamping mechanism includes a mounting frame, an inclined plate, a connecting plate, a clamping plate, an electric push rod I, a connecting seat, a motor III, and a fixing plate. One end of the mounting frame has a connecting seat, which is rotatably connected to the end of the adjusting plate away from the support arm via a rotating shaft. The fixing plate is fixed to the adjusting plate, and the motor III is fixed to the fixing plate, with the motor III's output shaft connected to the rotating shaft. The end of the mounting frame away from the connecting seat has a mounting groove, and a pair of inclined plates are symmetrically connected inside the mounting groove, each with a dovetail groove. A pair of clamping plates are fixed to the corresponding inclined plates. The connecting plate has trapezoidal blocks at both ends, which are slidably connected inside the dovetail grooves. The electric push rod I is fixed to the mounting frame, and its output end is connected to the connecting plate.

[0012] The advantages of this utility model compared with the prior art are as follows:

[0013] 1) In the auxiliary mechanism, motor I provides power to drive the bidirectional threaded rod to rotate. The bidirectional threaded rod drives the moving seat to move along the guide rod through the thread. The moving seat drives the arc-shaped support plate to move through the support seat and rollers, thereby adjusting the arc-shaped support plate to accommodate large plate beams of different lengths. The side wall of the large plate beam is equipped with a lifting buckle. When it is necessary to weld the bottom of the large plate beam, the arc-shaped support plate on one side of the large plate beam is moved away from the large plate beam. Then, the existing lifting device is connected to the lifting buckle to lift the large plate beam, so that the large plate beam rotates around the circle of the arc-shaped support plate. At the same time, the arc-shaped support plate rotates along the rollers, thereby improving the flexibility of the large plate beam's rotation and realizing the welding of the bottom of the large plate beam.

[0014] 2) In the rotating mechanism, motor II provides power to drive gear II to rotate, gear II drives gear I to rotate, and gear I drives the support arm to rotate through the rotating shaft; the support arm drives the clamping mechanism to rotate, thereby rotating the clamping mechanism to the outside of the large plate beam, which facilitates the feeding of the outer stiffening plates and diagonal stiffening plates; then electric push rod II provides power to drive the adjusting plate to move along the moving groove, thereby adjusting the position of the clamping mechanism through the adjusting plate, so as to place the stiffening plates and diagonal stiffening plates in the corresponding positions;

[0015] 3) Electric push rod I provides power to drive the connecting plate to move, and the connecting plate drives the inclined plate to move in the opposite direction of the mounting groove; thereby realizing the opening and closing of the clamping plate and clamping the plate; motor III provides power to drive the mounting frame and clamping plate to rotate through the connecting seat, thereby adjusting the angle of the clamping plate, which facilitates the positioning and welding of the inclined stiffener. Attached Figure Description

[0016] Appendix Figure 1 This is a schematic diagram of an automated welding fixture for a boiler steel structure large plate beam according to this utility model.

[0017] Appendix Figure 2 This is a schematic diagram of the auxiliary mechanism in the automated welding fixture structure of a boiler steel structure large plate beam of this utility model;

[0018] Appendix Figure 3 This is a schematic diagram of an automated welding fixture structure adjustment mechanism for a boiler steel structure large plate beam according to this utility model. Figure 1 ;

[0019] Appendix Figure 4 This is a schematic diagram of an automated welding fixture clamping mechanism for a boiler steel structure large plate beam according to this utility model. Figure 1 ;

[0020] Appendix Figure 5 This is a schematic diagram of an automated welding fixture clamping mechanism for a boiler steel structure large plate beam according to this utility model. Figure 2 ;

[0021] Appendix Figure 6 This is a schematic diagram of the inclined plate and connecting plate in the automated welding fixture structure of a boiler steel structure large plate beam according to this utility model;

[0022] Appendix Figure 7 This is a schematic diagram of an automated welding fixture structure adjustment mechanism for a boiler steel structure large plate beam according to this utility model. Figure 2 ;

[0023] Appendix Figure 8 This is a schematic diagram of the large plate beam in the automated welding fixture structure for a boiler steel structure large plate beam of this utility model;

[0024] In the diagram: 1. Support roller; 2. Auxiliary mechanism; 201. Movable seat; 202. Support seat; 203. Roller; 204. Arc-shaped support plate; 2041. Placement slot; 205. Support frame; 206. Bidirectional threaded rod; 207. Guide rod; 208. Motor I; 209. Bellows protective cover; 3. Adjustment mechanism; 301. Guide rail; 302. Transport carrier; 303. Column; 304. Support arm; 3041. Movable slot; 305. Adjustment plate; 306. Rotation mechanism; 3062. Protective cover; 3063. Rotating shaft; 3064, Gear I; 3065, Motor II; 3066, Gear II; 307, Electric push rod II; 308, Screw jack; 4, Clamping mechanism; 401, Mounting bracket; 4011, Mounting groove; 402, Inclined plate; 4021, Dovetail groove; 403, Connecting plate; 4031, Trapezoidal block; 404, Clamping plate; 405, Electric push rod I; 406, Connecting seat; 407, Motor III; 408, Fixing plate; 5, Large plate beam; 501, Rib plate; 502, Diagonal rib plate; 503, Lifting buckle. Detailed Implementation

[0025] To facilitate understanding by those skilled in the art, the following is a detailed explanation in conjunction with the appendix. Figure 1-8 The technical solution of this utility model will be further described in detail below.

[0026] An automated welding fixture for a boiler steel structure large plate girder includes a support roller 1, an auxiliary mechanism 2, an adjustment mechanism 3, and a clamping mechanism 4. Several support rollers 1 are evenly fixed to the ground. Two sets of auxiliary mechanisms 2 are installed on either side of the support roller 1. The adjustment mechanism 3 is installed on one side of the auxiliary mechanism 2, and the clamping mechanism 4 is connected to the adjustment mechanism 3. A welding robot is located on the side of the auxiliary mechanism 2 away from the adjustment mechanism 3. First, the web of the large plate girder 5 is transported to the support roller 1. Then, the position of the auxiliary mechanism 2 is adjusted, and then the flanges of the large plate girder 5 are transported to the auxiliary mechanism 2, so that the two flanges of the large plate girder 5 contact the sidewalls of the web and are welded. Then, the stiffening plates 501 and diagonal stiffening plates 502, and the lifting buckle 503 are clamped and placed on the sidewalls of the large plate girder 5 and welded in place by the adjustment mechanism 3 and the clamping mechanism 4.

[0027] The auxiliary mechanism 2 includes a movable base 201, a support base 202, rollers 203, an arc-shaped support plate 204, a support frame 205, a bidirectional threaded rod 206, a guide rod 207, a motor I 208, and a bellows cover 209. The support frame 205 is fixed to the ground, and the bidirectional threaded rod 206 is rotatably connected to both ends of the support frame 205 via bearings. A pair of guide rods 207 are provided, and the guide rods 207 are symmetrically fixed on the support frame 205 on both sides of the bidirectional threaded rod 206. The motor I 208 is fixed to the support frame 205. The frame 205 is mounted on a guide rod 207, and the output end is connected to one end of the bidirectional threaded rod 206. A pair of movable seats 201 are provided, passing through the guide rod 207 and symmetrically connected to the reverse threads of the bidirectional threaded rod 206. A pair of support seats 202 are provided, fixedly mounted on the corresponding movable seats 201. Two sets of rollers 203 are provided, each set having several evenly rotatably connected to the support seats 202. An arc-shaped support plate 204 overlaps the outer wall of the rollers 203. The arc-shaped support plate 204... The upper part 4 is provided with a placement slot 2041, and the wing plate of the large plate beam 5 is movably connected in the placement slot 2041; the outer side of the bidirectional threaded rod 206 is provided with a telescopic bellows protective cover 209; the motor I 208 provides power to drive the bidirectional threaded rod 206 to rotate, and the bidirectional threaded rod 206 drives the movable seat 201 to move along the guide rod 207 through the thread, and the movable seat 201 drives the arc-shaped support plate 204 to move through the support seat 202 and the roller 203, thereby adjusting the arc-shaped support plate 204 to adapt to different lengths. Large plate beam 5; The side wall of the large plate beam 5 is equipped with a lifting buckle 503. When it is necessary to weld the bottom of the large plate beam 5, the arc-shaped support plate 204 on one side of the large plate beam 5 is moved away from the large plate beam 5. Then, the large plate beam 5 is lifted by connecting the existing lifting device with the lifting buckle 503. The large plate beam rotates around the circle of the arc-shaped support plate 204 as the center. At the same time, the arc-shaped support plate 204 rotates along the roller 203, thereby improving the flexibility of the large plate beam 5 to rotate and realizing the welding of the bottom of the large plate beam 5.

[0028] The adjustment mechanism 3 includes a guide rail 301, a transport carrier 302, a column 303, a support arm 304, an adjustment plate 305, an electric push rod II 307, and a screw jack 308. The guide rail 301 is installed on the ground on one side of the auxiliary mechanism 2. The transport carrier 302 is movably installed on the guide rail 301 and has a wheel and a motor. Several wheels are provided and are rotatably connected to the transport carrier and movably installed on the guide rail 301. The motor is fixed to the transport carrier and connected to the wheels. The column 303 is fixed to the transport carrier 302, and the screw jack 308 is fixed to the column 303. The screw jack 308 is model HK130-7-1A-T-5002-F and is obtained through market purchase or private customization. The support arm 305... 4 is connected to the top of the screw jack; the support arm 304 is provided with a moving groove 3041 and the inside of the support arm 304 is hollow. The electric push rod II 307 is fixed inside the support arm 304. The adjusting plate 305 is movably connected in the moving groove 3041 of the support arm 304. The output end of the electric push rod II 307 passes through the side wall of the support arm 304 and is connected to the adjusting plate 305. The electric push rod II 307 provides power to drive the adjusting plate 305 to move along the moving groove 3041, thereby adjusting the position of the clamping mechanism 4 through the adjusting plate 305, so as to place the stiffener 501 and the inclined stiffener 502 in the corresponding positions, which facilitates the welding of the stiffener 501 and the inclined stiffener 502. The screw jack 308 can control the height of the support arm 304, the adjusting plate 305 and the clamping mechanism 4.

[0029] A rotating mechanism 306 is provided between the screw jack 308 and the support arm 304; the rotating mechanism 306 includes a protective cover 3062, a rotating shaft 3063, gear I 3064, a motor II 3065, and gear II 3066; the protective cover 3062 is fixed to the screw jack 308; the rotating shaft 3063 is rotatably connected to the protective cover, the support arm 304 is located above the protective cover 3062 and connected to the rotating shaft 3063, and gear I 3064 is provided on the rotating shaft 3063; the motor II 3065 is fixed to the protective cover 3062, and the motor II 3066... 5. The output shaft is equipped with gear II 3066; gear I 3064 meshes with gear II 3066, and gear I 3064 and gear II 3066 are located inside the protective cover 3062; motor II 3065 provides power to drive gear II 3066 to rotate, gear II 3066 drives gear I 3064 to rotate, and gear I 3064 drives the support arm 304 to rotate through the rotating shaft 3063; the support arm 304 drives the clamping mechanism 4 to rotate, thereby rotating the clamping mechanism 4 to the outside of the large plate beam 5, which facilitates the feeding of the outer stiffening plate 501 and the inclined stiffening plate 502.

[0030] The clamping mechanism 4 includes a mounting frame 401, an inclined plate 402, a connecting plate 403, a clamping plate 404, an electric push rod I 405, a connecting seat 406, a motor III 407, and a fixing plate 408. One end of the mounting frame 401 is provided with a connecting seat 406, which is rotatably connected to the end of the adjusting plate 305 away from the support arm 304 via a rotating shaft. The fixing plate 408 is fixed to the adjusting plate 305, and the motor III 407 is fixed to the fixing plate 408, with the output shaft of the motor III 407 connected to the rotating shaft. The end of the mounting frame 401 away from the connecting seat 406 is provided with a mounting groove 4011. A pair of inclined plates 402 are symmetrically connected inside the mounting groove 4011, and the inclined plates 402 are provided with dovetail grooves 4021. The clamping plate 404 is provided with a... Yes, the clamping plate 404 is fixed on the corresponding inclined plate 402; the connecting plate 403 has trapezoidal blocks 4031 at both ends, which are slidably connected inside the dovetail groove 4021; the electric push rod I 405 is fixed on the mounting frame 401, and its output end is connected to the connecting plate 403; the electric push rod I 405 provides power to drive the connecting plate 403 to move, and the connecting plate 403 drives the inclined plate 402 to move in the opposite direction along the mounting groove 4011; thereby realizing the opening and closing of the clamping plate 404, so that the clamping plate 404 can clamp; the motor III 407 provides power to drive the mounting frame 401 and the clamping plate 404 to rotate through the connecting seat 406, thereby adjusting the angle of the clamping plate 404, which facilitates the positioning and welding of the inclined rib plate 502.

[0031] An automated welding fixture for a boiler steel structure large plate girder operates as follows: First, the web of the large plate girder 5 is transported to the support roller 1. Then, the position of the auxiliary mechanism 2 is adjusted. Next, the flanges of the large plate girder 5 are transported to the auxiliary mechanism 2, so that the two flanges and the sidewalls of the web of the large plate girder 5 come into contact and are welded. Then, the electric push rod II 307 provides power to drive the adjusting plate 305 to move along the moving groove 3041, thereby adjusting the position of the clamping mechanism 4 through the adjusting plate 305, so that the stiffening plate 501 and the diagonal stiffening plate 502 are placed in the corresponding positions, which facilitates the welding of the stiffening plate 501 and the diagonal stiffening plate 502. 02 Welding is performed; the screw jack 308 can control the height of the support arm 304, the adjusting plate 305 and the clamping mechanism 4; the electric push rod I 405 provides power to drive the connecting plate 403 to move, and the connecting plate 403 drives the inclined plate 402 to move in the opposite direction along the mounting groove 4011; thereby realizing the opening and closing of the clamping plate 404, so that the clamping plate 404 can clamp; the motor III 407 provides power to drive the mounting frame 401 and the clamping plate 404 to rotate through the connecting seat 406, thereby adjusting the angle of the clamping plate 404, so as to facilitate the positioning and welding of the inclined stiffener 502.

[0032] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, the connection methods are divided into fixed connections and movable connections. Fixed connections include, but are not limited to, welding and bolting. Movable connections include, but are not limited to, sliding connections, rotating connections, and threaded connections. The selection of the connection method should be based on the application of the solution to achieve its intended effect. The invention includes, but is not limited to, power systems such as motors, electric actuators, and screw jacks, as well as their respective transmission systems. Protective covers are provided according to the actual installation location to prevent wear or damage to the power and transmission systems from the external environment, further ensuring the normal operation of the power and transmission systems. The electronic or electrical components, including but not limited to motors, electric actuators, and screw jacks, are existing components, obtained through customization or purchase. The electrical connections between these components are conventional circuit or electrical connections in the prior art and are not within the scope of protection of this invention.

[0034] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. An automated welding fixture for a boiler steel structure large plate girder, comprising support rollers, an auxiliary mechanism, an adjustment mechanism, and a clamping mechanism; characterized in that... Several support rollers are provided and evenly fixed on the ground; two sets of auxiliary mechanisms are provided and installed on both sides of the support rollers respectively; an adjustment mechanism is installed on one side of the auxiliary mechanism; a clamping mechanism is connected to the adjustment mechanism; and a welding robot is provided on the side of the auxiliary mechanism away from the adjustment mechanism. The auxiliary mechanism includes a movable seat, a support seat, rollers, an arc-shaped support plate, a support frame, a double-threaded rod, a guide rod, motor I, and a bellows cover. The support frame is fixed to the ground, and the double-threaded rod is rotatably connected to both ends of the support frame via bearings. A pair of guide rods are provided, symmetrically fixed to the support frames on both sides of the double-threaded rod. Motor I is fixed to the support frame, and its output end is connected to one end of the double-threaded rod. A pair of movable seats are provided, passing through the guide rods and symmetrically connected to the reverse threads of the double-threaded rod via threads. A pair of support seats are provided, fixedly installed on the corresponding movable seats. Two sets of rollers are provided, each set having several evenly rotatably connected to the support seats, and the arc-shaped support plate overlaps the outer wall of the rollers. The arc-shaped support plate has a placement groove, and the large plate beam wing plate is movably connected in the placement groove. A telescopic bellows cover is provided on the outside of the double-threaded rod.

2. The automated welding fixture for a boiler steel structure large plate girder according to claim 1, characterized in that... The adjustment mechanism includes a platform, guide rail, column, support arm, adjustment plate, electric push rod II, and screw jack. The guide rail is installed on the ground on one side of the auxiliary mechanism. The transport carrier is movably installed on the guide rail and has wheels and a motor on it. Several wheels are provided, rotatably connected to the transport carrier and movably installed on the guide rail. The motor is fixed to the transport carrier and connected to the wheels. The column is fixed to the transport carrier, and the screw jack is fixed to the column. The support arm is connected to the top of the screw jack. The column is movably connected to the guide rail, and the support arm is connected to the end of the column away from the guide rail. The support arm has a moving groove and is hollow inside. The electric push rod II is fixed inside the support arm, and the adjustment plate is movably connected to the moving groove of the support arm. The output end of the electric push rod II passes through the side wall of the support arm and connects to the adjustment plate.

3. The automated welding fixture for a boiler steel structure large plate girder according to claim 1, characterized in that... A rotating mechanism is provided between the screw jack and the support arm; the rotating mechanism includes a protective cover, a rotating shaft, gear I, a motor II, and gear II; the protective cover is fixed to the screw jack; the rotating shaft is rotatably connected to the protective cover, the support arm is located above the protective cover and connected to the rotating shaft, and gear I is provided on the rotating shaft; motor II is fixed to the protective cover, and gear II is provided on the output shaft of motor II; gear I meshes with gear II; gear I and gear II are located inside the protective cover.

4. The automated welding fixture for a boiler steel structure large plate girder according to claim 1, characterized in that... The clamping mechanism includes a mounting frame, an inclined plate, a connecting plate, a clamping plate, an electric push rod I, a connecting seat, a motor III, and a fixing plate. One end of the mounting frame has a connecting seat, which is rotatably connected to the end of the adjusting plate away from the support arm via a rotating shaft. The fixing plate is fixed to the adjusting plate, and motor III is fixed to the fixing plate, with the output shaft of motor III connected to the rotating shaft. The end of the mounting frame away from the connecting seat has a mounting groove, and a pair of inclined plates are symmetrically connected inside the mounting groove, each with a dovetail groove. A pair of clamping plates are fixed to the corresponding inclined plates. Trapezoidal blocks are provided at both ends of the connecting plate, slidingly connected inside the dovetail grooves. The electric push rod I is fixed to the mounting frame, and its output end is connected to the connecting plate.

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