Plasma automatic welding mechanism for steel structure

Abstract

The invention relates to the technical field of welding, in particular to an automatic plasma welding mechanism for a steel structure. The technical problems that due to the fact that a clamp is loosened, the clamping precision is low, the plasma arc state is single, and the welding effect is poor are solved. According to the technical scheme, the device comprises a base; the electric sliding frame is installed on the base, and the output end of the electric sliding frame can move front and back; the telescopic cylinder is mounted at the output end of the electric sliding frame; the device further comprises a welding unit, a moving unit and a clamping unit. Through the arrangement of the heat conduction arc protrusions, when inert gas is introduced into the gas storage box, the inert gas can be guided by the heat conduction arc protrusions to form vortexes and is sprayed out of the water cooling spray head, the spirally flowing inert gas compresses an electric arc through centripetal force, the stability of the electric arc is improved, and therefore the welding effect is improved; and the spirally flowing inert gas can form an air curtain barrier for a molten pool formed during welding, so that the isolation protection capability for the molten pool is improved, and oxidation is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and in particular to a plasma automatic welding mechanism for steel structures. Background Art

[0002] Plasma welding technology is a new welding technology that generates a plasma flow by ionizing inert gas, thereby forming an arc with a temperature of up to 28,000 degrees Celsius between the conductive tungsten rod and the material, melting the material and completing the welding. Plasma welding technology is widely used in the welding of metal parts, especially in the welding process of thicker steel parts.

[0003] Existing plasma welding mechanisms only weld materials by moving the plasma welding gun, but the plasma flow is generally in a single state, resulting in limitations in arc stability, penetration, weld formation, etc. In addition, when performing plasma welding, frequent use of the clamp will cause the clamp to loosen, resulting in low accuracy in positioning the steel structure and reduced plasma welding accuracy. To this end, a plasma automatic welding mechanism for steel structures that can clamp with high precision and weld efficiently is provided to overcome the arc welding effect and welding accuracy problems mentioned in the background technology. Summary of the Invention

[0004] In order to overcome the shortcomings of low clamping accuracy caused by loose clamps, single plasma arc state and poor welding effect, the technical problem of the present invention is to provide a plasma automatic welding mechanism for steel structures that can clamp with high precision and weld efficiently.

[0005] The technical implementation scheme of the present invention is: a plasma automatic welding mechanism for steel structure, comprising: base; Electric slide: the base is equipped with an electric slide, and the output end of the electric slide can move forward and backward; Telescopic cylinder: a telescopic cylinder is installed on the output end of the electric slide; Also included are: Welding unit: The output end of the telescopic cylinder is equipped with a welding unit, which is used to generate and compress the arc, so that the arc temperature increases and stabilizes the welded steel structure; The mobile unit and the clamping unit are installed on the base. An even number of clamping units are installed on the mobile unit. The mobile unit is used to adjust the position of the clamping unit along the left and right directions. The clamping unit is used to adaptively clamp steel structures of different sizes and shapes.

[0006] Preferably, the welding unit includes: The housing is fixedly mounted on the output end of the telescopic cylinder; A first sliding frame, wherein an arc-shaped sliding groove is provided in the housing, and the first sliding frame is slidably arranged in the arc-shaped sliding groove; An air storage box is fixedly arranged at the bottom of the first sliding frame, and an air intake pipe is provided on the top of the air storage box, and the air intake pipe passes through the first sliding frame; Water-cooling nozzle, the water-cooling nozzle is fixedly arranged in the gas storage box; Tungsten rod: The tungsten rod is fixed at the top of the gas storage box.

[0007] Preferably, the welding unit further comprises: There are several heat-conducting arc protrusions which are arranged in a circular distribution on the water-cooling nozzle.

[0008] Preferably, the welding unit further comprises: The protective cover is fixedly arranged at the bottom of the first sliding frame.

[0009] Preferably, the welding unit further comprises: A first motor, the first motor is fixedly installed on the top of the housing; A first screw rod is fixedly disposed at an output end of the first motor and is rotatably connected to the housing; The first threaded sleeve is arranged on the first screw rod through a threaded sleeve. The first sliding frame is provided with a linear slide groove, and the linear slide groove is movably connected to the first threaded sleeve.

[0010] Preferably, the mobile unit includes: The first brackets are an even number and are symmetrically distributed and fixedly arranged on the base; A support rod, the support rod is fixedly arranged between the left and right first brackets; a second sliding frame, the second sliding frame being slidably disposed on the support rod; A platform plate, the platform plate is fixedly arranged on a plurality of second sliding frames; The second bracket is symmetrically distributed and fixed on the base; a second screw rod, the second screw rod being rotatably disposed on the second bracket; A second motor, the second motor is fixedly mounted on one of the second brackets, and an output end of the second motor passes through the second bracket and is fixedly connected to the second screw rod; The second threaded sleeve is threadedly sleeved on the second screw rod and is fixedly connected to the platform plate.

[0011] Preferably, the clamping unit comprises: The mobile base has a plurality of first L-shaped grooves on the platform plate, and the mobile base is located above the first L-shaped grooves; Sliders, there are an even number of slide blocks, and all of them are slidably disposed in the first L-shaped groove of the platform plate; An elastic pad is fixedly arranged in the slider; A square nut is slidably disposed inside the slider and contacts the elastic pad; Bolts are mirror-imaged and arranged on the mobile base, and the bolts pass through the slider and the elastic pad in sequence and are threadedly connected with the square nut.

[0012] Preferably, the clamping unit further comprises: A damping ring is fixed on the top of the mobile base; A rotating frame, the rotating frame is rotatably arranged on the damping ring; The friction pad is fixedly arranged on the rotating frame.

[0013] Preferably, the clamping unit further comprises: A positioning frame, the positioning frame is fixedly arranged on the rotating frame; The third sliding frame has a second L-shaped groove symmetrically opened on the positioning frame, and the third sliding frame is slidably arranged in the second L-shaped groove; An L-shaped frame, the L-shaped frame is rotatably arranged on the third sliding frame via a damping shaft; There are two friction wheels, which are fixed at both ends of the L-shaped frame.

[0014] Preferably, the clamping unit further comprises: A third screw rod is rotatably disposed on the positioning frame and is threadedly connected to the third sliding frame; The knob is fixedly arranged at one end of the third screw rod.

[0015] The beneficial effects of the present invention are: 1. The present invention provides a heat-conducting arc protrusion. When inert gas is introduced into the gas storage box, the inert gas will be guided by the heat-conducting arc protrusion to form a vortex and ejected from the water-cooled nozzle. The spirally flowing inert gas compresses the arc through centripetal force, thereby improving the arc stability and thus improving the welding effect. In addition, the spirally flowing inert gas will form an air curtain barrier for the molten pool formed during welding, thereby improving the isolation and protection capability of the molten pool and reducing oxidation.

[0016] 2. The present invention provides an L-shaped frame and a friction wheel. The third sliding frame moves through the L-shaped frame to drive the friction wheel to move. When the friction wheel is squeezed by the steel structure, the friction wheel drives the L-shaped frame to rotate, thereby moving the friction wheel downward. The downward movement of the friction wheel will cause itself to deform, thereby rubbing and squeezing the steel structure downward, increasing the pressure of the steel structure on the friction pad, thereby increasing the positioning effect of the friction pad on the steel structure and improving the positional stability of the steel structure during welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention from a first perspective; Figure 2 This is a schematic diagram of the structure from a second viewing angle of the present invention; Figure 3 A half-section schematic diagram of the housing of the present invention; Figure 4 It is a cross-sectional schematic diagram of the gas storage box of the present invention; Figure 5 Schematic cross-section of the water-cooling nozzle of the present invention; Figure 6 Schematic diagram of the explosion of the water-cooling nozzle and tungsten rod of the present invention; Figure 7 This is a schematic structural diagram of the second threaded sleeve of the present invention; Figure 8 is a schematic cross-sectional view of the clamping unit of the present invention; Figure 9 Schematic diagram of the explosion of the square nut and bolt of the present invention; Figure 10 Schematic diagram of the explosion of the clamping unit of the present invention; Figure 11 It is a structural schematic diagram of the positioning frame of the present invention.

[0018] The parts in the accompanying drawings are marked as follows: 1. Base, 2. Electric slide, 201. Telescopic cylinder, 3. Welding unit, 301. Housing, 3011. Arc slide, 302. First slide, 3021. Linear slide, 303. Gas storage box, 304. Water-cooled nozzle, 3041. Heat-conducting arc protrusion, 305. Tungsten rod, 306. Protective cover, 307. First motor, 308. First screw rod, 309. First threaded sleeve, 4. Moving unit, 401. First bracket, 402. Support rod, 403. Second sliding frame, 404, platform plate, 405, second bracket, 406, second screw rod, 407, second motor, 408, second threaded sleeve, 5, clamping unit, 501, movable base, 5011, slider, 5012, elastic pad, 5013, square nut, 5014, bolt, 502, damping ring, 503, rotating frame, 504, friction pad, 505, positioning frame, 506, third sliding frame, 507, L-shaped frame, 508, friction wheel, 509, third screw rod, 510, knob. DETAILED DESCRIPTION

[0019] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] A plasma automatic welding mechanism for steel structures, such as Figure 1-Figure 2As shown, it includes: a base 1; an electric slide 2, the electric slide 2 is installed on the base 1, and the output end of the electric slide 2 can move forward and backward; a telescopic cylinder 201, the telescopic cylinder 201 is installed on the output end of the electric slide 2, and also includes: a welding unit 3, the welding unit 3 is installed at the output end of the telescopic cylinder 201, the welding unit 3 is used to generate and compress the arc, so that the arc temperature increases and can stably weld the steel structure; a moving unit 4 and a clamping unit 5, the moving unit 4 is installed on the base 1, the clamping unit 5 has an even number and is installed on the moving unit 4, the moving unit 4 is used to adjust the position of the clamping unit 5 along the left and right directions, and the clamping unit 5 is used to adaptively clamp steel structures of different sizes and shapes.

[0021] like Figure 2-Figure 6 As shown, the welding unit 3 includes: a shell 301, which is fixedly installed at the output end of the telescopic cylinder 201; a first sliding frame 302, an arc-shaped slide groove 3011 is opened in the shell 301, and the first sliding frame 302 is slidably set in the arc-shaped slide groove 3011; an air storage box 303, which is fixedly set at the bottom of the first sliding frame 302, and an air intake pipe is provided at the top of the air storage box 303, and the air intake pipe passes through the first sliding frame 302; a water-cooling nozzle 304, which is fixedly set in the air storage box 303, and the water-cooling nozzle 304 can be connected to an external water pump through a hose; a tungsten rod 305, which is fixedly set at the top of the air storage box 303.

[0022] like Figure 6 As shown, the welding unit 3 also includes: a heat-conducting arc protrusion 3041. There are several heat-conducting arc protrusions 3041 and they are distributed in a ring on the water-cooling nozzle 304. The heat-conducting arc protrusions 3041 are used to guide the spiral flow of the inert gas, so that the inert gas compresses the arc through centripetal force, thereby improving the arc stability and thus improving the welding effect. The spirally flowing inert gas will form an air curtain barrier for the molten pool formed during welding, thereby improving the isolation and protection ability of the molten pool and reducing oxidation.

[0023] like Figure 2-Figure 4 As shown, the welding unit 3 further includes: a protective cover 306, which is fixedly arranged at the bottom of the first sliding frame 302. The protective cover 306 is used to prevent welding slag from splashing during steel structure welding and maintain an inert gas environment at the welding point of the steel structure.

[0024] like Figure 3As shown, the welding unit 3 also includes: a first motor 307, the first motor 307 is fixedly installed on the top of the shell 301; a first screw rod 308, the first screw rod 308 is fixedly arranged at the output end of the first motor 307, and the first screw rod 308 is rotatably connected to the shell 301; a first threaded sleeve 309, the first threaded sleeve 309 is threadedly sleeved on the first screw rod 308, and a linear slide groove 3021 is provided on the first sliding frame 302, and the linear slide groove 3021 is movably connected to the first threaded sleeve 309.

[0025] like Figure 1 and Figure 7 As shown, the mobile unit 4 includes: a first bracket 401, which has an even number of first brackets 401 and is symmetrically distributed and fixed on the base 1; a support rod 402, which is fixed between the left and right first brackets 401; a second sliding bracket 403, which is slidably set on the second sliding bracket 402; a platform plate 404, which is fixed on several second sliding brackets 403; a second bracket 405, which has two second brackets 405 and is symmetrically distributed and fixed on the base 1; a second screw rod 406, which is rotatably set on the second bracket 405; a second motor 407, which is fixedly mounted on one of the second brackets 405, and the output end of the second motor 407 passes through the second bracket 405 and is fixedly connected to the second screw rod 406; a second threaded sleeve 408, which is threadedly sleeved on the second screw rod 406, and the second threaded sleeve 408 is fixedly connected to the platform plate 404.

[0026] like Figure 7-Figure 9 As shown, the clamping unit 5 includes: a movable base 501, a plurality of first L-shaped grooves are opened on the platform plate 404, and the movable base 501 is located above the first L-shaped groove; a slider 5011, there are an even number of sliders 5011, and they are all slidably set in the first L-shaped groove of the platform plate 404; an elastic pad 5012, the elastic pad 5012 is fixedly set in the slider 5011; a square nut 5013, the square nut 5013 is slidably set inside the slider 5011 and contacts the elastic pad 5012; a bolt 5014, the bolt 5014 is mirror-distributed and penetrates the movable base 501, and the bolt 5014 sequentially penetrates the slider 5011 and the elastic pad 5012, and is threadedly connected to the square nut 5013, so that the square nut 5013 squeezes the elastic pad 5012.

[0027] like Figure 8 and Figure 10-11As shown, the clamping unit 5 also includes: a damping ring 502, which is fixedly arranged on the top of the movable base 501; a rotating frame 503, which is rotatably arranged on the damping ring 502; and a friction pad 504, which is made of metal and is fixedly arranged on the rotating frame 503, and is used to position the steel structure in the left and right directions.

[0028] like Figure 8 and Figure 10-11 As shown, the clamping unit 5 also includes: a positioning frame 505, the positioning frame 505 is fixedly arranged on the rotating frame 503; a third sliding frame 506, a second L-shaped groove is symmetrically opened on the positioning frame 505, and the third sliding frame 506 is slidably arranged in the second L-shaped groove; an L-shaped frame 507, the L-shaped frame 507 is rotatably arranged on the third sliding frame 506 through the damping shaft; a friction wheel 508, there are two friction wheels 508 and they are fixedly arranged at both ends of the L-shaped frame 507. The friction wheel 508 is a flexible part that can squeeze the steel structure downward when the L-shaped frame 507 rotates, thereby positioning the steel structure in the vertical direction and increasing the pressure of the steel structure on the friction pad 504, thereby increasing the positioning effect of the friction pad 504 on the steel structure in the left and right directions.

[0029] like Figure 10-11 As shown, the clamping unit 5 also includes: a third screw rod 509, which is rotatably set on the positioning frame 505 and is threadedly connected to the third sliding frame 506; and a knob 510, which is fixedly set at one end of the third screw rod 509.

[0030] In the initial state, the square nut 5013 contacts but does not squeeze the elastic pad 5012, so that the bolt 5014 on the square nut 5013 does not engage to limit the position of the movable base 501 on the platform plate 404, and the clamping unit 5 is not installed on the platform plate 404. The staff first measures the width and length of the steel structure, and slides the slider 5011 into the appropriate first L-shaped groove in the platform plate 404 according to the size of the steel structure, so that the slider 5011 drives the entire clamping unit 5 to slide on the platform plate 404, and then the staff rotates the bolt 5014, so that the bolt 5014 drives the square nut 5013 to slide in the slider 5011 and squeeze the elastic pad 5012, so that the slider 5011 squeezes the platform plate 404, and the bolt 5014 squeezes the movable base 501 , the movable base 501 is clamped and positioned by the bolt 5014, and then the staff puts the steel structure on the friction pad 504 and turns the knob 510. The knob 510 drives the third screw rod 509 to rotate, so that the third screw rod 509 drives the third sliding frame 506 to slide on the second L-shaped groove of the positioning frame 505 and approach the steel structure. The third sliding frame 506 moves through the L-shaped frame 507 to drive the friction wheel 508 to move until the friction wheel 508 contacts the steel structure. Since the movement trajectory of the third sliding frame 506 is inclined downward when sliding on the second L-shaped groove of the positioning frame 505, when the friction wheel 508 contacts the steel structure, the third sliding frame 506 continues to move, causing the friction wheel 508 near the bottom of the L-shaped frame 507 to be squeezed by the steel structure, thereby driving the L-shaped frame 507 to rotate. Figure 10 For example, the friction wheel 508 drives the L-shaped frame 507 to rotate counterclockwise under the pressure of the steel structure, thereby moving the friction wheel 508 downward. The downward movement of the friction wheel 508 will cause itself to deform, thereby rubbing and squeezing the steel structure downward, increasing the pressure of the steel structure on the friction pad 504, thereby increasing the positioning effect of the friction pad 504 on the steel structure and improving the position stability of the steel structure during welding. In addition, as the friction wheel 508 is squeezed by the steel structure, if there is an angle between the contact surface of the friction wheel 508 and the steel structure, the friction wheel 508 will be squeezed and driven through the L-shaped frame 507 The third sliding frame 506 rotates, so that the third sliding frame 506 drives the rotating frame 503 to rotate through the positioning frame 505, so that the rotating frame 503 rotates with the axis of the damping ring 502 as the rotating axis until the friction surface of the friction wheel 508 fits with the steel structure, thereby improving the clamping stability of the friction wheel 508 on the steel structure. Among them, the damping ring 502 can prevent the rotating frame 503 from rotating when it is not driven by the steel structure, thereby further improving the clamping stability of the clamping unit 5 and ensuring the positioning accuracy during the welding of the steel structure. At this time, the positioning of the clamping unit 5 on the steel structure is completed.

[0031] After completing the positioning of the clamping unit 5 on the steel structure, the staff connects the positive pole of the external power supply to the steel structure through a wire and starts the electric slide 2, so that the electric slide 2 drives the entire welding unit 3 to approach the welding position of the steel structure through the telescopic cylinder 201. Then the staff starts the telescopic cylinder 201, so that the telescopic cylinder 201 drives the entire welding unit 3 to further approach the welding position of the steel structure. At this time, based on the angle difference between the water-cooling nozzle 304 and the welding point of the steel structure, the staff starts the first motor 307, so that the first motor 307 drives the first screw rod 308 to rotate. When the first screw rod 308 rotates, it drives the first threaded sleeve 309 to squeeze the linear slide groove 3021, thereby driving the first slide 302 to slide along the arc slide groove 3011. During the sliding process of 302, the angle is offset, thereby driving the water-cooling nozzle 304 and the tungsten rod 305 to have an angle offset through the gas box 303, so that the axis of the water-cooling nozzle 304 and the tungsten rod 305 is kept perpendicular to the welding point of the steel structure, so as to ensure that the energy of the arc is evenly distributed during the welding of the steel structure, and achieve high-quality welding. The water pump is started to continuously supply coolant to the water-cooling nozzle 304 through the hose (the water pump and the hose are existing technology, so they are not shown in the figure and will not be described in detail. Only the relevant interface is shown on the top of the water-cooling nozzle 304), so that the water-cooling nozzle 304 always maintains a low temperature to prevent the arc from melting the water-cooling nozzle 304 during welding. Then the staff introduces inert gas into the air inlet pipe on the top of the gas box 303. The inert gas It will flow along the heat-conducting arc protrusion 3041, so that the inert gas will flow in a spiral and be compressed and ejected along the water-cooling nozzle 304, and finally flow out along the gap between the protective sleeve 306 and the steel structure, and energize the tungsten rod 305, so that the negative pole of the external power supply is connected to the tungsten rod 305. At this time, an arc is formed between the tungsten rod 305 and the steel structure, so that the arc melts the steel structure. Among them, the spirally flowing inert gas compresses the arc through centripetal force, thereby improving the arc stability and thus improving the welding effect. The spirally flowing inert gas will form an air curtain barrier for the molten pool formed during welding, thereby improving the isolation and protection ability of the molten pool and reducing oxidation, thereby improving the welding effect of this mechanism on the steel structure. By adjusting the flow rate of the inert gas entering the gas storage box 303, the inert gas can regulate the arc The compression degree of the arc can be adjusted more flexibly, thereby effectively improving the welding accuracy. When the front and rear welding positions of the steel structure need to be adjusted, the output end of the electric slide 2 can be adjusted to move forward and backward, so that the output end of the electric slide 2 drives the welding unit 3 to move forward and backward through the telescopic cylinder 201, thereby realizing the front and rear adjustment of the welding position of the steel structure. When the left and right welding positions of the steel structure need to be adjusted, the second motor 407 can be started, so that the output end of the second motor 407 drives the second screw rod 406 to rotate, so that the second screw rod 406 drives the platform plate 404 to move left and right through the second threaded sleeve 408, so that the platform plate 404 drives the steel structure to move left and right through the entire clamping unit 5, thereby realizing the left and right adjustment of the welding position of the steel structure, until the welding is completed.The staff disconnected the power supply to the tungsten rod 305, stopped the inert gas from entering the gas box 303, and shut down the water pump, stopping the coolant from entering the water-cooling nozzle 304 through the hose.

[0032] The technical principles of the embodiments of the present invention have been described above in conjunction with specific embodiments. These descriptions are intended solely to explain the principles of the embodiments of the present invention and should not be construed in any way as limiting the scope of protection of the embodiments of the present invention. Based on the explanations herein, those skilled in the art will be able to conceive of other specific implementations of the embodiments of the present invention without inventive effort, and such implementations will fall within the scope of protection of the embodiments of the present invention.

Claims

1. A plasma automatic welding mechanism for steel structures, comprising: Base (1); An electric slide (2) is mounted on the base (1), and an output end of the electric slide (2) can move forward and backward; A telescopic cylinder (201) is installed on the output end of the electric slide (2); Its characteristics are: Also included are: A welding unit (3) is installed at the output end of the telescopic cylinder (201), and the welding unit (3) is used to generate and compress the arc, thereby increasing the arc temperature and stabilizing the welded steel structure; A moving unit (4) and a clamping unit (5), wherein the moving unit (4) is mounted on the base (1), an even number of clamping units (5) are mounted on the moving unit (4), the moving unit (4) is used to adjust the position of the clamping unit (5) along the left and right directions, and the clamping unit (5) is used to adaptively clamp steel structures of different sizes and shapes.

2. A plasma automatic welding mechanism for steel structures according to claim 1, characterized in that: The welding unit (3) includes: A housing (301), the housing (301) is fixedly mounted on the output end of the telescopic cylinder (201); A first sliding frame (302) is provided with an arc-shaped sliding groove (3011) in the housing (301), and the first sliding frame (302) is slidably arranged in the arc-shaped sliding groove (3011); An air storage box (303), the air storage box (303) is fixedly arranged at the bottom of the first sliding frame (302), and an air intake pipe is provided on the top of the air storage box (303), and the air intake pipe passes through the first sliding frame (302); A water-cooling nozzle (304), the water-cooling nozzle (304) is fixedly disposed in the gas storage box (303); The tungsten rod (305) is fixedly arranged on the top end of the gas storage box (303).

3. A plasma automatic welding mechanism for steel structures according to claim 2, characterized in that: The welding unit (3) further comprises: There are a plurality of heat-conducting arc protrusions (3041) which are arranged in an annular distribution on the water-cooling nozzle (304).

4. A plasma automatic welding mechanism for steel structures according to claim 2, characterized in that: The welding unit (3) further comprises: The protective cover (306) is fixedly arranged at the bottom of the first sliding frame (302).

5. A plasma automatic welding mechanism for steel structures according to claim 2, characterized in that: The welding unit (3) further comprises: A first motor (307), the first motor (307) is fixedly mounted on the top of the housing (301); A first screw rod (308), the first screw rod (308) is fixedly disposed at the output end of the first motor (307), and the first screw rod (308) is rotationally connected to the housing (301); A first threaded sleeve (309) is provided on the first screw rod (308) through a threaded sleeve, and a linear slide groove (3021) is provided on the first sliding frame (302), and the linear slide groove (3021) is movably connected to the first threaded sleeve (309).

6. A plasma automatic welding mechanism for steel structures according to claim 1, characterized in that: The mobile unit (4) comprises: First brackets (401), there are an even number of first brackets (401) which are symmetrically distributed and fixedly arranged on the base (1); A support rod (402), the support rod (402) is fixedly arranged between the left and right first brackets (401); A second sliding frame (403), the second sliding frame (403) is slidably arranged on the support rod (402); A platform plate (404), the platform plate (404) is fixedly arranged on a plurality of second sliding frames (403); A second bracket (405), the second bracket (405) is symmetrically distributed and fixedly arranged on the base (1); A second screw rod (406), the second screw rod (406) is rotatably disposed on the second bracket (405); A second motor (407), the second motor (407) is fixedly mounted on one of the second brackets (405), and an output end of the second motor (407) passes through the second bracket (405) and is fixedly connected to the second screw rod (406); The second threaded sleeve (408) is mounted on the second screw rod (406) through a threaded sleeve, and the second threaded sleeve (408) is fixedly connected to the platform plate (404).

7. A plasma automatic welding mechanism for steel structures according to claim 1, characterized in that: The clamping unit (5) comprises: A movable base (501), a plurality of first L-shaped grooves are formed on the platform plate (404), and the movable base (501) is located above the first L-shaped grooves; Slide blocks (5011), there are an even number of slide blocks (5011), and all of them are slidably disposed in the first L-shaped groove of the platform plate (404); An elastic pad (5012), the elastic pad (5012) is fixedly disposed in the slider (5011); A square nut (5013) is slidably disposed inside the slider (5011) and contacts the elastic pad (5012); Bolts (5014) are mirror-imaged and arranged on the mobile base (501). The bolts (5014) sequentially penetrate the slider (5011) and the elastic pad (5012) and are threadedly connected to the square nut (5013).

8. A plasma automatic welding mechanism for steel structures according to claim 7, characterized in that: The clamping unit (5) further comprises: A damping ring (502), the damping ring (502) is fixedly arranged on the top of the movable base (501); A rotating frame (503), the rotating frame (503) is rotatably disposed on the damping ring (502); The friction pad (504) is fixedly arranged on the rotating frame (503).

9. A plasma automatic welding mechanism for steel structures according to claim 8, characterized in that: The clamping unit (5) further comprises: A positioning frame (505), the positioning frame (505) is fixedly arranged on the rotating frame (503); A third sliding frame (506), a second L-shaped groove is symmetrically opened on the positioning frame (505), and the third sliding frame (506) is slidably arranged in the second L-shaped groove; An L-shaped frame (507), the L-shaped frame (507) being rotatably mounted on the third sliding frame (506) via a damping shaft; There are two friction wheels (508) fixedly arranged at both ends of the L-shaped frame (507).

10. A plasma automatic welding mechanism for steel structures according to claim 9, characterized in that: The clamping unit (5) further comprises: A third screw rod (509), the third screw rod (509) is rotatably disposed on the positioning frame (505), and the third screw rod (509) is threadedly connected to the third sliding frame (506); The knob (510) is fixedly arranged at one end of the third screw rod (509).

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