Steel structure plate butt welding device and working method thereof

Abstract

The invention discloses a steel structure plate butt welding device and a working method thereof. The steel structure plate butt welding device comprises a bottom plate, a top plate and lateral supports on the two sides. A clamping assembly used for clamping a steel structure plate is arranged on the lateral support, the welding assembly comprises a welding gun, a motor, a third lead screw, a sliding block and an electric push rod, and front-back movement and height adjustment of the welding gun are achieved; the driving assembly comprises a gear, a rotating rod, a rotating disc and a rack, and vertical displacement of the clamping assembly is achieved through gear and rack transmission. A positioning device is further arranged on the rack, comprises a second lead screw and an internal thread knob and is used for finely adjusting and locking the position of the clamping assembly. Coarse adjustment is achieved through the driving assembly, fine adjustment is achieved through the positioning device, the tops of the two plates with different thicknesses are adjusted to the same horizontal plane, it is ensured that welding faces are aligned, the problems that in the prior art, the welding faces are uneven and the welding seam quality is poor due to the plate thickness difference are solved, and the beneficial effects of being convenient and fast to operate, high in welding precision and high in adaptability are achieved.

Description

Technical Field

[0001] This invention belongs to the field of plate welding technology, and particularly relates to a butt welding device for steel structure plates and its working method. Background Technology

[0002] In the construction of steel structures for factories, plate welding is one of the core processes, and its welding quality directly affects the stability and safety of the steel structure. Existing technologies, such as Chinese Patent Publication No. CN218193330U, disclose a plate welding device including a base, support, welding components, and adjustment components, capable of clamping and adjusting plates of different sizes. However, this device, through a combination of clamping plates and clamping seats, can only achieve horizontal position adjustment and cannot handle welding scenarios with plates of varying thicknesses. When the two plates to be welded have different thicknesses, after clamping and fixing, it is difficult to keep the tops of the two plates on the same horizontal plane, resulting in a height difference at the weld joint. This leads to uneven welds, insufficient penetration, and other quality problems, affecting welding strength and safety. Therefore, there is an urgent need for a welding device that can precisely adjust the height of the plates and ensure that the weld surfaces are flush. Summary of the Invention

[0003] This application achieves coarse adjustment of the plate height by using a gear and rack mechanism in the drive assembly to move the second clamping assembly up and down after clamping plates of different thicknesses in the first and second clamping assemblies respectively; and fine adjustment is achieved by using the cooperation of the threaded rod and the knob to ensure that the tops of the two plates are flush, thus solving the problem of uneven welding surfaces and poor weld quality caused by differences in plate thickness in the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A steel structure plate butt welding device includes a bottom plate, a top plate, and two lateral supports located between the top plate and the bottom plate. The device is characterized in that: the top plate is provided with welding components, and the lateral supports are provided with clamping components for clamping the two sides of the steel structure plate. The clamping components are driven by a driving component to move up and down, thereby adjusting the position of the steel structure plate and realizing the butt welding of the two sides of the steel structure plate. The welding assembly includes a welding torch, a motor, a third lead screw, a slider, a moving groove, and an electric push rod. The slider is threadedly connected to the third lead screw. The welding torch is connected to the slider via the electric push rod. The third lead screw is driven to rotate forward and backward by the motor, thereby moving the slider back and forth, and thus moving the welding torch back and forth. The drive assembly includes a gear, a rotating rod located inside the central shaft of the gear, a turntable located at the outwardly extending end of the rotating rod, and a rack meshing with the gear. The rack is connected to a side plate via a connecting plate.

[0005] More preferably, the clamping assembly includes a base plate, a side plate, and an upper clamping plate. A first lead screw is fixed on the upper clamping plate. The first lead screw is threadedly connected to an internal threaded hole provided on the side plate. By rotating the first lead screw with a disc, the upper clamping plate can be moved up and down, thereby clamping the steel structure plate.

[0006] Furthermore, the rack of the drive assembly is also provided with a positioning device for positioning the clamping assembly and the drive assembly.

[0007] Furthermore, the positioning device includes a second lead screw, which is fixed to the top surface of a vertically arranged rack. After the upper part of the second lead screw passes through the top plate, it is positioned by an internal thread knob. The internal thread knob is fixed to the top surface of the top plate by a bearing. The bottom surface of the outer ring of the bearing is welded to the top plate, and the bottom surface of the internal thread knob is welded to the inner ring of the bearing.

[0008] Furthermore, the lateral support has a cavity inside for accommodating the gear, rack, and second lead screw.

[0009] More preferably, the movable groove is formed on the top plate, the third lead screw is rotatably connected to the front and rear side walls of the movable groove, the width of the slider is adapted to the width of the movable groove, the output end of the motor passes through the side wall of the movable groove and is fixedly connected to the third lead screw, and the electric push rod is fixedly connected to the outer shell of the welding gun.

[0010] A working method for a steel structure plate butt welding device, characterized in that: Includes the following steps: Step 1: Clamp the two plates to be welded onto the clamping components on both sides respectively; Step 2: Use a vernier caliper or height gauge with a measurement accuracy of 0.02mm to measure the height difference Δh between the tops of the two boards; Step 3: Make coarse adjustments using the gear and rack mechanism of the drive component. Each rotation of the turntable will raise or lower the clamping component by 5-10 mm, adjusting the height difference Δh to ≤3.0 mm. Step 4: Fine-tune the second lead screw of the positioning device in conjunction with the internal thread knob. The pitch of the second lead screw is 1.5mm-2.5mm. Adjust the height difference Δh to ≤1.0mm and lock the inner ring of the locking bearing to lock the position of the clamping assembly. Step 5: Use a feeler gauge to check the gap at the joint of the two plates. After ensuring that the gap is ≤0.5mm, start the welding assembly and control the moving speed of the welding gun to 300-500mm / min for welding. Step 6: After welding is completed, disassemble the welded plates.

[0011] Compared with the prior art, the present invention has the following features and beneficial effects: This application achieves coarse adjustment of the plate height by using gear and rack transmission in the drive assembly to move one side clamping assembly up and down; then fine adjustment is performed by using the second lead screw of the positioning device in conjunction with the internal thread knob to adjust the top of the two plates to the same horizontal plane, achieving precise docking and solving the problem of uneven welding surface and poor weld quality caused by the difference in plate thickness in the prior art.

[0012] This application achieves rapid clamping and release of plates of different thicknesses by connecting the first lead screw in the clamping assembly to the upper pressure plate via a threaded connection. This results in stable clamping and convenient operation, and solves the problem of easy displacement of plates during welding.

[0013] This application achieves automatic and uniform movement of the welding torch by cooperating with the motor, the third lead screw, and the slider in the welding assembly. With the help of the electric push rod to adjust the height of the welding torch, it achieves uniform weld and consistent penetration depth, thus solving the problems of low efficiency and unstable quality of manual welding. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a steel structure plate butt welding device according to this application; Figure 2 This diagram illustrates the positional relationship between the welding assembly, the driving assembly, and the clamping assembly involved in this application. Figure 3 for Figure 2 Enlarged structural diagram of section A in the middle; Figure 4 for Figure 2 Enlarged structural diagram of section C; Figure 5 for Figure 2 Enlarged structural diagram of section B in the middle; Figure 6 This is a structural diagram illustrating the positional relationship between the positioning device and the driving component involved in this application.

[0015] Reference numerals: Base plate 1, Top plate 2, Lateral support 3, Welding assembly 4, Welding torch 41, Motor 42, Third lead screw 43, Slider 44, Moving groove 45, Electric push rod 46, Clamping assembly 5, Base plate 51, Side plate 52, Upper pressure plate 53, First lead screw 54, Drive assembly 6, Gear 61, Rotating rod 62, Turntable 63, Rack 64, Connecting plate 65, Disc 7, Positioning device 8, Second lead screw 81, Internal thread knob 82, Receiving cavity 9. Detailed Implementation

[0016] To make the technical means, innovative features, objectives and effects of this invention easier to understand, the invention will be further described below.

[0017] The embodiments described herein are specific implementations of the present invention, used to illustrate the concept of the invention, and are illustrative and exemplary, and should not be construed as limiting the implementation or scope of the invention. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include those that make any obvious substitutions and modifications to the embodiments described herein.

[0018] Example 1: Structural Example like Figures 1 to 6 As shown, a steel structure plate butt welding device includes a base plate 1, a top plate 2, and two lateral supports 3 fixedly connected between the base plate 1 and the top plate 2. The two lateral supports 3 are symmetrically arranged, with a clamping assembly 5 installed on one side of the lateral support 3 and the other side of the lateral support 3 also having a clamping assembly 5 installed. The clamping assemblies 5 on both sides are driven by a driving assembly 6 to achieve vertical displacement.

[0019] An infrared laser alignment and calibration device is also installed on the top plate 2. The device includes an infrared generator fixed at the center of the top plate 2 and a focusing target set at the front end of the welding torch 41. The infrared beam emitted by the infrared generator is projected vertically downward to the center of the focusing target. When the welding torch 41 moves to the starting position of the weld, the beam offset is observed through the scale ring on the focusing target to achieve rapid alignment and calibration between the welding torch 41 and the weld, ensuring the accuracy of the welding starting point.

[0020] A pressure sensor is embedded on the upper surface of the base plate 51 of the clamping assembly 5. The pressure sensor is matched with the corresponding position on the lower surface of the upper clamping plate 53. When the upper clamping plate 53 clamps the plate, the pressure sensor detects the clamping pressure in real time and displays the pressure value through an external display screen. This allows the operator to control the clamping force within the range of 200N-500N, avoiding plate deformation due to excessive clamping force or welding displacement due to insufficient clamping force.

[0021] A precision guide mechanism is also provided between the rack 64 of the drive assembly 6 and the lateral support 3. This mechanism includes a linear guide rail fixed to the inner wall of the lateral support 3 and a slider fixed to the back of the rack 64. The slider slides in cooperation with the linear guide rail to ensure that the rack 64 maintains a verticality error of ≤0.02mm / m during the lifting process, thereby improving the repeatability of height adjustment.

[0022] The positioning device 8 has a scale dial on the circumferential surface of the internal thread knob 82, and a reference pointer is provided on the top plate 2 at the corresponding position. 36-72 scale lines are evenly distributed on the scale dial. Each rotation corresponds to a 0.02mm-0.05mm rise or fall of the second lead screw 81, realizing quantitative control and micron-level fine adjustment of height.

[0023] A weld seam tracking sensor is installed on the side of the welding torch 41 of the welding assembly 4. This sensor is a laser vision sensor or a CCD image sensor. It detects the weld seam position offset in real time and feeds it back to the controller. The controller finely adjusts the speed of the motor 42 according to the feedback signal to realize the automatic tracking of the weld seam by the welding torch 41, ensuring that the welding torch is always aligned with the center of the weld seam during the welding process.

[0024] Dust covers are also provided on both sides of the moving groove 45. The dust covers are telescopic accordion covers or roller shutter structures. One end is fixed to the end of the moving groove 45, and the other end is connected to the slider 44. They extend and retract as the slider 44 moves, effectively preventing welding spatter and dust from entering the interior of the moving groove 45 and protecting the third lead screw 43 and guide rail from contamination.

[0025] A welding slag collection device is also installed on the top plate 2. The device includes a slag collection box fixed to the side of the top plate 2 and a negative pressure suction pipe connected to the slag collection box. The suction nozzle of the negative pressure suction pipe is fixed to the back of the welding gun 41 by a universal bracket. The opening of the suction nozzle faces the weld area. The negative pressure is activated simultaneously during the welding process to collect welding spatter and welding slag and keep the workbench clean.

[0026] To improve the device's adaptability to plates of different thicknesses, a preload spring is fitted on the first lead screw 54 and the second lead screw 81. The preload spring is located between the upper pressure plate 53 and the side plate 52. When the first lead screw 54 is loosened, the preload spring assists in pushing the upper pressure plate 53 to reset, reducing operating resistance.

[0027] The bottom of the lateral support 3 is provided with a reinforcing rib at the connection with the base plate 1. The reinforcing rib is a triangular structure and is arranged in 2-4 groups at intervals along the length of the lateral support 3. The thickness of each group of reinforcing ribs is 8mm-12mm, which enhances the rigidity and bending strength of the lateral support 3 and avoids structural deformation caused by clamping heavy plates.

[0028] The upper surface of the base plate 1 is also provided with plate support rollers. The plate support rollers are arranged at intervals along the welding direction. The height of the rollers is adjustable and they are used to support the middle suspended part of the long plate and prevent the plate from sagging due to its own weight, which would cause changes in the joint gap.

[0029] A flexible buffer mechanism is provided between the electric push rod 46 and the slider 44 of the welding assembly 4. The mechanism includes a guide sleeve, a buffer spring and a limiting ring. The fixed end of the electric push rod 46 is inserted into the guide sleeve, and the buffer spring is sleeved between the electric push rod 46 and the guide sleeve. When the welding torch 41 contacts the plate, the buffer spring absorbs the impact force and protects the welding torch 41 and the surface of the plate.

[0030] For ease of operation and monitoring, a control panel is provided on the side of the top plate 2. The control panel integrates a display screen, buttons and indicator lights. It is electrically connected to the motor 42, electric push rod 46, pressure sensor and weld seam tracking sensor through a PLC controller to realize the setting, display and automatic control of welding parameters.

[0031] The clamping assembly 5 includes a base plate 51, a side plate 52, and an upper clamping plate 53. The base plate 51 is horizontally positioned, the side plate 52 is vertically fixed to the base plate 51, and the upper clamping plate 53 is located above the base plate 51 and slides in cooperation with the side plate 52. A first lead screw 54 is fixedly connected to the top of the upper clamping plate 53, and the first lead screw 54 is threadedly connected to an internal threaded hole opened at the top of the side plate 52. A disc 7 is fixedly installed at the top of the first lead screw 54 for easy manual tightening. By rotating the disc 7, the first lead screw 54 is rotated, causing the upper clamping plate 53 to move up and down along the side plate 52, thereby clamping or releasing steel structural plates with a thickness ranging from 5mm to 30mm in cooperation with the base plate 51.

[0032] The drive assembly 6 includes a gear 61, a rotating rod 62, a turntable 63, a rack 64, and a connecting plate 65. The rotating rod 62 is horizontally positioned, with one end rotatably connected to the inner wall of the lateral support 3, and the other end penetrating the lateral support 3 and extending to the outside, with the end fixedly connected to the turntable 63. The gear 61 is fixedly sleeved on the rotating rod 62 and located in the receiving cavity 9 inside the lateral support 3. The rack 64 is vertically positioned and meshes with the gear 61. The back of the rack 64 is fixedly connected to the side plate 52 of the clamping assembly 5 via the connecting plate 65. When the turntable 63 rotates, the gear 61 drives the rack 64 to move up and down, thereby causing the clamping assembly 5 to rise and fall as a whole. For each rotation of the turntable, the clamping assembly rises and falls by 5mm to 10mm.

[0033] The positioning device 8 includes a second lead screw 81 and an internal thread knob 82. The second lead screw 81 is vertically arranged, with its bottom end fixedly connected to the top surface of the rack 64. The upper part of the second lead screw 81 passes through the top plate 2 and extends above the top plate 2. The internal thread knob 82 is sleeved on the second lead screw 81 and is rotatably connected to the top surface of the top plate 2 via a bearing. The bottom surface of the outer ring of the bearing is welded and fixed to the top plate 2, and the bottom surface of the internal thread knob 82 is welded and fixed to the inner ring of the bearing. The pitch of the second lead screw 81 is 1.5mm to 2.5mm. Rotating the internal thread knob 82 can drive the second lead screw 81 to move up and down slightly, thereby finely adjusting the height of the rack 64 and the clamping assembly 5. When rotation stops, the threads of the internal thread knob 82 and the second lead screw 81 self-lock, and with the axial limiting of the bearing, the position of the clamping assembly 5 can be locked.

[0034] The welding assembly 4 includes a welding torch 41, a motor 42, a third lead screw 43, a slider 44, a moving groove 45, and an electric push rod 46. The moving groove 45 is formed on the top plate 2 along the front-to-back direction. The third lead screw 43 is located within the moving groove 45, with its two ends rotatably connected to the front and rear side walls of the moving groove 45 via bearings. The motor 42 is fixedly mounted on the top plate 2, and its output end passes through the side wall of the moving groove 45 and is fixedly connected to one end of the third lead screw 43. The slider 44 is threaded onto the third lead screw 43, and the width of the slider 44 is adapted to the width of the moving groove 45, ensuring that the slider 44 can only slide back and forth along the moving groove 45 and cannot rotate. The fixed end of the electric push rod 46 is fixedly connected to the bottom of the slider 44, and the output end of the electric push rod 46 is fixedly connected to the outer shell of the welding torch 41. The forward and reverse rotation of motor 42 can drive the third lead screw 43 to rotate, causing the slider 44 to move back and forth, thereby driving the welding torch 41 to move along the weld direction. The moving speed can be set from 300mm / min to 500mm / min. The extension and retraction of electric push rod 46 can adjust the height of welding torch 41 to adapt to plates of different thicknesses.

[0035] The lateral support 3 has a cavity 9 inside, which is used to accommodate the lower part of the gear 61, rack 64 and second lead screw 81, to avoid external interference, and at the same time play a role in dust prevention and protection.

[0036] Fixing methods between components: The base plate 1 and the side support 3, and the top plate 2 and the side support 3 are connected by welding or bolts; the welding of the bearing and the top plate 2 must ensure concentricity; the connection between each lead screw and the corresponding component is made by threaded engagement or welding; the motor 42 is fixed to the top plate 2 by bolts; the connection between the electric push rod 46 and the slider 44 and the welding gun 41 is made by bolts or clips to ensure stability.

[0037] Example 2: Usage Method Example This embodiment describes in detail the working method of butt welding of steel structure plates using the device described in Embodiment 1, including the following steps: Step 1: Clamping the sheet metal Place two steel structural plates, each 5mm to 30mm thick, onto the base plate 51 of the clamping assembly 5 on both sides, ensuring one edge of the plate is flush against the side plate 52. Observe the pressure sensor readings, and rotate the discs 7 on both sides to rotate the first lead screw 54, causing the upper clamping plate 53 to move downwards until the pressure sensor displays a clamping force within the set range of 300N-400N, ensuring the plates are firmly clamped and do not deform. During clamping, ensure the welded edges of the plates are aligned and leave a 0.5mm to 2mm gap between the welded edges and the plates.

[0038] Step 2: Centering and calibrating the welding torch Start the infrared laser alignment and calibration device, turn on the infrared generator, and observe the projection position of the infrared beam on the focusing target. Manually adjust the initial position of the welding torch 41 through the control panel to ensure that the infrared beam is accurately projected onto the center scale of the focusing target, thus ensuring the alignment accuracy of the welding torch 41 with the weld start point.

[0039] Step 3: Measure the height difference Using a vernier caliper or height gauge with a measurement accuracy of 0.02 mm, measure the height of the top of each of the two boards relative to the base plate 1 or the reference plane, and calculate the height difference Δh. Record this value as a basis for adjustment.

[0040] Step 4: Coarsely adjust the height Coarse adjustment is performed via drive assembly 6 based on the sign of the height difference Δh (i.e., which plate is higher). If the plate on the side requiring adjustment is lower than the other side, the turntable 63 on that side is rotated clockwise. Turntable 63 drives gear 61 to rotate via rotating rod 62. Gear 61 drives rack 64 to move upward. The precision guide mechanism ensures that rack 64 rises and falls vertically, thereby raising clamping assembly 5 and the plate. If the plate needs to be lowered, turntable 63 is rotated counterclockwise. Each rotation of turntable 63 raises and lowers clamping assembly 5 by 5mm to 10mm (the specific value depends on the gear module and rack pitch). Repeat the measurement and adjustment until the height difference Δh ≤ 3.0mm. Step 5: Fine Adjustment of Height After coarse adjustment, fine adjustment is performed using positioning device 8. Following the indications of the dial and reference pointer, precisely rotate the internal thread knob 82. Since the internal thread knob 82 is threadedly connected to the second lead screw 81 and axially fixed to the top plate 2 via a bearing, rotating the internal thread knob 82 will cause the second lead screw 81 to drive the rack 64 and clamping assembly 5 to move slightly up and down. The pitch of the second lead screw 81 is 1.5mm to 2.5mm, and each rotation of the dial corresponds to a rise or fall of 0.02mm-0.05mm, achieving quantitative fine adjustment. Repeatedly measure and fine-tune until the height difference Δh ≤ 1.0mm. After adjustment, stop rotating the internal thread knob 82. Utilize the thread self-locking and the axial limit of the bearing to lock the position of the clamping assembly 5, ensuring that the height remains constant during welding.

[0041] Step 6: Check the seam gaps Use a feeler gauge to check the gap at the joint between the two plates, ensuring the gap is ≤0.5mm. If the gap is too large, the horizontal position of the plates can be finely adjusted (by re-clamping), or it can be compensated for by welding, but the gap must be guaranteed to meet the requirements.

[0042] Step 7: Start welding Welding parameters are set via the control panel: welding torch movement speed is 300mm / min to 500mm / min, and the torch height is automatically adjusted according to the plate thickness. The slag collection device is activated, and the negative pressure suction pipe begins operation. Then, welding assembly 4 is activated: the electric push rod 46 extends, lowering the welding torch 41 to a suitable height, typically ensuring the welding wire tip contacts the plate surface or maintains a distance of 1mm to 2mm. Motor 42 is activated, driving the third lead screw 43 to rotate, which in turn drives the slider 44 to move uniformly along the moving groove 45. The weld seam tracking sensor detects the weld seam position in real time and automatically fine-tunes the welding torch movement speed to ensure the torch is always aligned with the weld seam center. The welding torch 41 moves with the slider 44, welding the joint between the two plates. During welding, the dust cover extends and retracts with the slider 44, effectively preventing welding spatter from entering the moving groove 45.

[0043] Step 8: Welding Completion and Disassembly After welding is completed, turn off motor 42 and welding torch 41, retract electric push rod 46, and raise welding torch 41 to its initial position. Turn off slag collection device. Rotate discs 7 on both sides to raise upper pressure plate 53 (pre-tension spring assists in resetting), releasing the welded plate. Remove the plate and inspect weld quality. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A butt welding device for steel structure plates, comprising a base plate (1), a top plate (2), and lateral supports (3) located on both sides between the top plate (2) and the base plate (1), characterized in that: The top plate (2) is provided with a welding assembly (4), and the lateral support (3) is provided with a clamping assembly (5) for clamping the two sides of the steel structure plate. The clamping assembly (5) is driven by the driving assembly (6) to move up and down, thereby adjusting the position of the steel structure plate and realizing the docking of the two sides of the steel structure plate. The welding assembly (4) includes a welding torch (41), a motor (42), a third lead screw (43), a slider (44), a moving groove (45), and an electric push rod (46). The slider (44) is threadedly connected to the lead screw (43). The welding torch (41) is connected to the slider (44) through the electric push rod (46). The third lead screw (43) is driven to rotate forward and backward by the motor (42) to realize the forward and backward displacement of the slider (44), thereby realizing the forward and backward displacement of the welding torch (41). The drive assembly (6) includes a gear (61), a rotating rod (62) located inside the central shaft of the gear (61), a turntable (63) located at the outwardly extending end of the rotating rod (62), and a rack (64) meshing with the gear (61). The rack (64) is connected to the side plate (52) via a connecting plate (65).

2. The butt welding device for steel structure plates as described in claim 1, characterized in that: The clamping assembly (5) includes a base plate (51), a side plate (52) and an upper pressure plate (53). A first lead screw (54) is fixed on the upper pressure plate (53). The first lead screw (54) is threadedly connected to the internal threaded hole provided on the side plate (52). By rotating the first lead screw (54) through the disc (7), the upper pressure plate (53) can be moved up and down, thereby pressing the steel structure plate.

3. The butt welding device for steel structure plates as described in claim 1, characterized in that: The rack (64) of the drive assembly (6) is also provided with a positioning device (8) for positioning the clamping assembly (5) and the drive assembly (6).

4. The butt welding device for steel structure plates as described in claim 1, characterized in that: The positioning device (8) includes a second lead screw (81), which is fixed to the top surface of a vertically arranged rack (64). After the upper part of the second lead screw (81) passes through the top plate (2), it is positioned by an internal thread knob (82). The internal thread knob (82) is fixed to the top surface of the top plate (2) by a bearing. The bottom surface of the outer ring of the bearing is welded to the top plate (2), and the bottom surface of the internal thread knob (82) is welded to the inner ring of the bearing.

5. The butt welding device for steel structure plates as described in claim 1, characterized in that: The lateral support (3) has a cavity (9) for accommodating the gear (61), rack (64) and second lead screw (81).

6. The butt welding device for steel structure plates as described in claim 1, characterized in that: The movable groove (45) is opened on the top plate (2). The third lead screw (43) is rotatably connected to the front and rear side walls of the movable groove (45). The width of the slider (44) is adapted to the width of the movable groove (45). The output end of the motor (42) passes through the side wall of the movable groove (45) and is fixedly connected to the third lead screw (43). The electric push rod (46) is fixedly connected to the outer shell of the welding gun (41).

7. The working method of the steel structure plate butt welding device as described in any one of claims 1 to 6, characterized in that: Includes the following steps: Step 1: Clamp the two plates to be welded onto the clamping components (5) on both sides respectively; Step 2: Use a vernier caliper or height gauge with a measurement accuracy of 0.02mm to measure the height difference Δh between the tops of the two boards; Step 3: Make a coarse adjustment using the gear and rack mechanism of the drive component (6). For each rotation of the turntable (63), the clamping component (5) will be raised or lowered by 5-10mm, and the height difference Δh will be adjusted to ≤3.0mm. Step 4: Fine-tune the second lead screw (81) and the internal thread knob (82) of the positioning device (8). The pitch of the second lead screw (81) is 1.5mm-2.5mm. Adjust the height difference Δh to ≤1.0mm and lock the inner ring of the bearing to lock the position of the clamping assembly (5). Step 5: Use a feeler gauge to check the gap at the joint of the two plates. After ensuring that the gap is ≤0.5mm, start the welding assembly (4) and control the moving speed of the welding gun (41) to 300-500mm / min for welding. Step 6: After welding is completed, disassemble the welded plates.

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