Welding device for steel structure

Abstract

The invention relates to the technical field of welding devices, in particular to a welding device for a steel structure. A welding device for a steel structure comprises an outer cylinder, a stud, a ceramic ring and an auxiliary mechanism. The auxiliary mechanism comprises a first pull ring and a plurality of supports. A plurality of first cutting grooves are formed in the lower side face of the ceramic ring. And a plurality of first knocking strips are fixedly arranged on the inner side of the first pull ring. And the outer cylinder descends until the stud abuts against the workpiece. Under the limitation of the multiple supports, it can be basically guaranteed that the stud is perpendicular to the welding face of the workpiece, the stability of the pressure applying direction is kept, and the stud is prevented from inclining in the welding process. And the first knocking strip knocks the first cutting groove to crush the ceramic ring, so that fine particles generated by random crushing are reduced. According to the welding device for the steel structure, the problems that when an existing welding device is used for welding a stud, the stud is prone to inclining, and after welding is finished, too many chippings exist when a ceramic ring is removed, and cleaning is difficult are solved.

Description

Technical Field

[0001] The invention relates to the technical field of welding devices, and in particular to a welding device for steel structures. Background Art

[0002] Stud welding is a special arc welding technology, which is mainly used to firmly weld metal studs to the surface of steel structures to achieve fast and efficient fixation and connection. Its core principle is to concentrate heat energy instantly, so that the studs and the base material melt and fuse at the contact area at the same time to form a complete fusion weld. Main features and advantages: High efficiency and speed: Stud welding can complete the welding process in a very short time, greatly improving production efficiency. Excellent connection performance: The fully fused weld formed has high strength, good shear resistance and fatigue resistance, meeting the requirements of construction, shipbuilding, automobile manufacturing and other industries for structural stability. Beautiful welding: The weld is neat and beautiful in appearance, and no secondary processing is required. It is suitable for applications with high requirements for assembly appearance. High degree of automation: It is suitable for the application of automated welding equipment to achieve standardization and precise control of the welding process. Application field: Stud welding technology is widely used in building steel structures, bridges, shipbuilding, machinery manufacturing and home appliances, providing efficient and stable connection solutions for various structural parts. Through the continuous optimization of welding processes and equipment, stud welding is becoming one of the indispensable key processes in modern industry.

[0003] Existing welding devices often require ceramic rings when firmly welding metal studs to the surface of steel structures. Ceramic tubes are an indispensable auxiliary tool in stud welding by accurately positioning, controlling the molten pool, isolating oxidation and protecting against spatter, which directly affects the weld quality and process stability. The ceramic ring needs to be removed after welding, but there will be too much debris when removing the ceramic ring, making it difficult to clean up later.

[0004] For example, the invention patent with announcement number CN102310256B provides an arc stud welding gun, which can simply adjust the welding height of the stud and is suitable for studs of different welding heights. The adsorption and detachment process of the male sleeve and the fixed sleeve is fast and stable, the conductive shaft has small runout, and the welding quality is stable. However, when welding the stud and the welding plate, the manual operation of the invention has unstable welding pressure, which causes the stud to be skewed. Summary of the invention

[0005] The invention provides a welding device for steel structure, so as to solve the problems of the existing welding device that the stud is easy to be skewed when welding the stud, and too many debris and difficult cleaning when removing the ceramic ring after welding.

[0006] The welding device for steel structures of the present invention adopts the following technical solution: A welding device for steel structures includes an outer cylinder, a stud, a ceramic ring, and an auxiliary mechanism. The outer cylinder is vertically arranged, the ceramic ring and the stud are both coaxially arranged with the outer cylinder, and the stud, the ceramic ring, and the outer cylinder are distributed in sequence from the inside to the outside. The ceramic ring can move up and down relative to the stud and the outer cylinder. A plurality of first cutting grooves are formed on the lower side surface of the ceramic ring, and the plurality of first cutting grooves are distributed along the circumferential direction of the ceramic ring. Along the direction from top to bottom, the first cutting groove is wedge-shaped, and the width of the first cutting groove along the circumferential direction of the ceramic ring gradually increases.

[0007] The auxiliary mechanism includes a first pull ring and a plurality of brackets, and the plurality of brackets are distributed along the circumferential direction of the outer cylinder. A first connecting rod is rotatably arranged in the middle of the bracket, one end of the first connecting rod is rotatably connected with the outer cylinder, and the lower end of the bracket is used to abut against the workpiece.

[0008] The first pull ring is slidably arranged on the outside of the ceramic ring, and the first pull ring is coaxially arranged with the ceramic ring. A second connecting rod is rotatably arranged at the lower part of each bracket, and one end of the second connecting rod is rotatably connected with the first pull ring. The second connecting rod is obliquely arranged. A plurality of first knocking bars are fixedly arranged on the inner side of the first pull ring, and the first knocking bars are located in the first cutting grooves. The lower ends of the plurality of brackets are close to each other, and the brackets drive the first knocking bars to move upward, knocking the first cutting grooves to break the ceramic ring.

[0009] Furthermore, a welding device for steel structures further includes a clamping cylinder, the clamping cylinder is coaxially arranged with the outer cylinder, the clamping cylinder is slidably arranged in the outer cylinder, and the clamping cylinder is located above the ceramic ring. The clamping cylinder has elasticity, and the upper end of the stud is arranged in the clamping cylinder.

[0010] Furthermore, it further includes a driving mechanism, the driving mechanism includes an electric cylinder, the electric cylinder is fixedly arranged in the outer cylinder, and the extending end of the electric cylinder is vertically arranged. The clamping cylinder includes a plurality of elastic pieces, the plurality of elastic pieces are sequentially distributed along the circumferential direction of the stud, the extending end of the electric cylinder is fixedly connected with the upper ends of the elastic pieces, and the lower ends of the elastic pieces abut against the stud.

[0011] Furthermore, a moving ring is slidably arranged on the outside of the outer cylinder, and the moving ring is coaxially arranged with the outer cylinder. The upper end of the bracket is rotatably connected with the moving ring. The auxiliary mechanism further includes a tension spring, and the tension spring connects the moving ring and the outer cylinder.

[0012] Furthermore, a torsion spring is arranged at the rotational connection between the bracket and the moving ring.

[0013] Furthermore, a connecting block is fixedly arranged on the outer cylinder, a guiding groove is formed on the connecting block, and the guiding groove is vertically arranged. A limiting hole is formed on the connecting block, and the limiting hole communicates with the guiding groove.

[0014] The auxiliary mechanism further includes a limiting component, which includes a top frame, a pressing plate and a pin. A guide rod is fixedly arranged on the top frame. The guide rod is vertically arranged and is slidably arranged in the guiding groove. A plurality of connecting holes are formed in the guide rod, and the plurality of connecting holes are sequentially distributed along the vertical direction. The pin penetrates through the limiting hole and one of the connecting holes to limit the relative positions of the guide rod and the connecting block. The pressing plate is fixedly arranged on the top frame and is used to abut against the upper side surface of the ceramic ring.

[0015] Furthermore, a wire is arranged on the outer cylinder, and the wire is connected to the stud.

[0016] Furthermore, each bracket includes a sliding rod and a roller. The roller is rotatably arranged at the lower end of the sliding rod, and the second connecting rod is rotatably connected to the sliding rod. The roller is used to abut against the workpiece.

[0017] Furthermore, an arc starting block is fixedly arranged at the lower end of the stud.

[0018] Furthermore, a handle is fixedly arranged on the outer cylinder.

[0019] The beneficial effects of the present invention are as follows: For a welding device for steel structures of the present invention, through the arranged auxiliary mechanism, the outer cylinder is placed at the target position, and the lower side surface of the ceramic ring abuts against the workpiece. When pressing down the outer cylinder, when the outer cylinder moves downward, the bracket is driven to rotate through the first connecting rod, and the lower ends of the plurality of brackets move away from each other. The outer cylinder descends until the stud abuts against the workpiece. Under the limitation of the plurality of brackets, it can basically ensure that the welding surface of the stud and the workpiece is perpendicular and maintain the stability of the pressing direction, avoiding the skew of the stud during welding.

[0020] After the stud abuts against the workpiece, power is supplied to the stud, and the stud is moved upward. An arc is generated between the stud and the workpiece, and the lower end of the stud and the welding surface of the workpiece are melted. Then the stud is moved downward so that the lower end of the stud contacts and adheres to the workpiece.

[0021] After the welding is completed, the outer cylinder is quickly lifted upward. The lower ends of the plurality of brackets approach each other. The bracket drives the first pull ring to move upward through the second connecting rod, and the first pull ring drives the first knocking bar to move upward. The first knocking bar knocks on the first cutting groove to break the ceramic ring. Since the first cutting groove is a prefabricated stress concentration point, when a cutting force is applied along the first cutting groove, this stress concentration can cause cracks to preferentially initiate at the notch and expand along a predetermined direction, forming a controllable main crack and reducing the fine particles generated by random fragmentation. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Structural schematic diagram of a welding device for steel structures provided by an embodiment of the present invention; Figure 2 Cross-sectional view of a welding device for steel structures provided by an embodiment of the present invention; Figure 3 Structural schematic diagram of a welding device for steel structures provided by an embodiment of the present invention when the bracket is opened; Figure 4 Structural schematic diagram of a first pull ring of a welding device for steel structures provided by an embodiment of the present invention; Figure 5 Structural schematic diagram of a ceramic ring of a welding device for steel structures provided by an embodiment of the present invention; Figure 6 Structural schematic diagram of a welding device for steel structures provided by one embodiment of the present invention; Figure 7 Structural schematic diagram of a second pull ring of a welding device for steel structures provided by one embodiment of the present invention; Figure 8 Structural schematic diagram of a ceramic ring of a welding device for steel structures provided by one embodiment of the present invention; Figure 9 Structural schematic diagram of a welding device for steel structures provided by another embodiment of the present invention.

[0024] In the figure: 100, outer cylinder; 101, moving ring; 102, tension spring; 104, top frame; 105, guide rod; 107, bracket; 1071, roller; 108, first pull ring; 1081, first knocking bar; 109, second connecting rod; 111, clamping cylinder; 112, third connecting rod; 113, second pull ring; 1131, second knocking bar; 114, knocking piece; 120, first connecting rod; 130, connecting block; 131, limiting hole; 140, pressing plate; 150, electric wire; 200, ceramic ring; 201, first cutting groove; 203, second cutting groove; 204, third cutting groove; 300, stud; 301, arc starting block; 310, handle. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] Referring Figures 1 to 5 As shown, a welding device for steel structures provided by an embodiment of the present invention includes an outer cylinder 100, a stud 300, a ceramic ring 200, and an auxiliary mechanism. The outer cylinder 100 is vertically arranged, the ceramic ring 200 and the stud 300 are both coaxially arranged with the outer cylinder 100, and the stud 300, the ceramic ring 200, and the outer cylinder 100 are distributed in sequence from the inside to the outside. The ceramic ring 200 can move up and down relative to the stud 300 and the outer cylinder 100. A plurality of first cutting grooves 201 are formed on the lower side surface of the ceramic ring 200, and the plurality of first cutting grooves 201 are sequentially distributed along the circumferential direction of the ceramic ring 200. The first cutting groove 201 is wedge-shaped, and along the direction from top to bottom, the width of each first cutting groove 201 along the circumferential direction of the ceramic ring 200 gradually increases.

[0027] The auxiliary mechanism includes a first pull ring 108 and a plurality of brackets 107, and the plurality of brackets 107 are distributed along the circumferential direction of the outer cylinder 100. A first connecting rod 120 is rotatably arranged in the middle of the bracket 107, one end of the first connecting rod 120 is rotatably connected to the outer cylinder 100, and the lower end of the bracket 107 is used to abut against the workpiece.

[0028] The first pull ring 108 is slidably arranged up and down on the outside of the ceramic ring 200, and the first pull ring 108 is coaxially arranged with the ceramic ring 200. A second connecting rod 109 is rotatably arranged at the lower part of each bracket 107, and one end of the second connecting rod 109 is rotatably connected to the first pull ring 108. The second connecting rod 109 is inclined, and along the direction from top to bottom, the first connecting rod 120 gradually moves away from the first pull ring 108. A plurality of first knocking bars 1081 are fixedly arranged on the inner side of the first pull ring 108, and the first knocking bars 1081 are located in the first cutting grooves 201. The lower ends of the plurality of brackets 107 are close to each other, and the brackets 107 drive the first knocking bars 1081 to move upward, knocking the first cutting grooves 201 to break the ceramic ring 200.

[0029] Place the outer cylinder 100 at the target position, and the lower side surface of the ceramic ring 200 abuts against the workpiece. Press down the outer cylinder 100. When the outer cylinder 100 moves downward, the brackets 107 are driven to rotate through the first connecting rod 120, and the lower ends of the plurality of brackets 107 move away from each other. The outer cylinder 100 descends until the stud 300 abuts against the workpiece. Under the limitation of the plurality of brackets 107, it can be basically ensured that the welding surface of the stud 300 and the workpiece is perpendicular, and the stability of the pressing direction is maintained, avoiding the skew of the stud 300 during welding.

[0030] After the stud 300 abuts against the workpiece, the stud 300 is electrified and the stud 300 is moved upward. An arc is generated between the stud 300 and the workpiece, and the lower end of the stud 300 and the welding surface of the workpiece are melted. Then the stud 300 is moved downward so that the lower end of the stud 300 contacts and adheres to the workpiece.

[0031] After the welding is completed, the outer cylinder 100 is quickly lifted upward. The lower ends of the plurality of brackets 107 approach each other. The bracket 107 drives the first pull ring 108 to move upward through the second connecting rod 109. The first pull ring 108 drives the first knocking bar 1081 to move upward. The first knocking bar 1081 knocks on the first cutting groove 201 to break the ceramic ring 200. Since the first cutting groove 201 is a prefabricated stress concentration point, when a cutting force is applied along the first cutting groove 201, this stress concentration can cause cracks to preferentially initiate at the notch and expand along a predetermined direction, forming a controllable main crack and reducing the fine particles generated by random fragmentation.

[0032] As Figures 6 to 8 shown, in one embodiment, the auxiliary mechanism further includes a second pull ring 113. The second pull ring 113 is slidably disposed outside the ceramic ring 200 up and down, and the second pull ring 113 is coaxially disposed with the ceramic ring 200. The second pull ring 113 is located above the first pull ring 108. A plurality of third connecting rods 112 are rotatably disposed on the second pull ring 113. The plurality of third connecting rods 112 are sequentially distributed along the circumferential direction of the second pull ring 113. Each third connecting rod 112 is rotatably connected to the bracket 107. The third connecting rod 112 is inclined, and along the direction from top to bottom, the third connecting rod 112 gradually approaches the second pull ring 113. A plurality of second knocking bars 1131 are fixedly disposed inside the second pull ring 113. Each second knocking bar 1131 corresponds to a first knocking bar 1081.

[0033] A plurality of second cutting grooves 203 are formed in the upper side of the ceramic ring 200. The plurality of second cutting grooves 203 are sequentially distributed along the circumferential direction of the ceramic ring 200. The second cutting groove 203 is wedge-shaped, and along the direction from top to bottom, the width of the second cutting groove 203 along the circumferential direction of the ceramic ring 200 gradually decreases. The second knocking bar 1131 is disposed in the second cutting groove 203.

[0034] When the lower ends of the plurality of brackets 107 move away from each other, the third connecting rod 112 drives the second pull ring 113 to move upward. When the lower ends of the plurality of brackets 107 approach each other, the third connecting rod 112 drives the second pull ring 113 to move downward. The second knocking bar 1131 knocks on the second cutting groove 203 to break the ceramic ring 200. Combining with the knocking of the first knocking bar 1081 on the first cutting groove 201, the breaking effect is better.

[0035] As Figure 9As shown, in another embodiment, the auxiliary mechanism includes a plurality of brackets 107, which are sequentially distributed along the circumferential direction of the outer cylinder 100. A first connecting rod 120 is rotatably arranged in the middle of the bracket 107. One end of the first connecting rod 120 is rotatably connected to the outer cylinder 100, and the lower end of the bracket 107 is used to abut against the workpiece. A knocking piece 114 is fixedly arranged at the lower part of each bracket 107. A plurality of third cutting grooves 204 are formed in the circumferential wall of the ceramic ring 200, and the plurality of third cutting grooves 204 are distributed along the circumferential direction of the ceramic ring 200, and each third cutting groove 204 is arranged vertically. Each knocking piece 114 is used to be arranged in a third cutting groove 204. When the lower ends of the plurality of brackets 107 approach each other, the bracket 107 drives the knocking piece 114 to knock the third cutting groove 204 to break the ceramic ring 200.

[0036] In this embodiment, a welding device for steel structures further includes a clamping cylinder 111, which is coaxially arranged with the outer cylinder 100. The clamping cylinder 111 is located above the ceramic ring 200, and the clamping cylinder 111 is slidably arranged in the outer cylinder 100 up and down. The clamping cylinder 111 has elasticity, and the upper end of the stud 300 is arranged in the clamping cylinder 111.

[0037] In this embodiment, a welding device for steel structures further includes a driving mechanism. The driving mechanism includes an electric cylinder, which is fixedly arranged in the outer cylinder 100, and the extending end of the electric cylinder is arranged vertically. The clamping cylinder 111 includes a plurality of elastic pieces, which are sequentially distributed along the circumferential direction of the stud 300. The extending end of the electric cylinder is fixedly connected to the upper ends of the elastic pieces, and the lower ends of the elastic pieces abut against the stud 300. After the plurality of elastic pieces clamp the stud 300, the electric cylinder is started, and the electric cylinder drives the stud 300 to move up and down through the clamping cylinder 111.

[0038] In this embodiment, a moving ring 101 is slidably arranged on the outer side of the outer cylinder 100, and the moving ring 101 is coaxially arranged with the outer cylinder 100. The upper end of the bracket 107 is rotatably connected to the moving ring 101. The auxiliary mechanism further includes a tension spring 102, which connects the moving ring 101 and the outer cylinder 100.

[0039] After the bracket 107 contacts the workpiece, the outer cylinder 100 is pressed downward, and the lower ends of the plurality of brackets 107 move away from each other. At this time, the bracket 107 drives the moving ring 101 to move upward, and the tension spring 102 is stretched. When the outer cylinder 100 is pulled upward, under the action of the tension spring 102, the auxiliary bracket 107 resets.

[0040] In this embodiment, a torsion spring is arranged at the rotational connection between the bracket 107 and the moving ring 101. When the outer cylinder 100 is pressed downward and the lower ends of the plurality of brackets 107 move away from each other, the torsion spring stores energy. When the outer cylinder 100 is pulled upward, under the action of the torsion spring, the auxiliary bracket 107 resets.

[0041] In this embodiment, a connecting block 130 is fixedly arranged on the outer cylinder 100. A guiding groove is formed in the connecting block 130, and the guiding groove is arranged vertically. A limiting hole 131 is formed in the connecting block 130, and the limiting hole 131 communicates with the guiding groove.

[0042] The auxiliary mechanism further includes a limiting component. The limiting component includes a top frame 104, a pressing plate 140 and a pin. A guide rod 105 is fixedly arranged on the top frame 104. The guide rod 105 is arranged vertically, and the guide rod 105 is slidably arranged in the guiding groove. A plurality of connecting holes are formed in the guide rod 105, and the plurality of connecting holes are distributed in sequence along the vertical direction. The pin penetrates through the limiting hole 131 and a connecting hole to limit the relative positions of the guide rod 105 and the connecting block 130. The pressing plate 140 is fixedly arranged on the top frame 104, and the pressing plate 140 is used to abut against the upper side surface of the ceramic ring 200.

[0043] Place the outer cylinder 100 at the target position, and the lower side surface of the ceramic ring 200 abuts against the workpiece. Then move the top frame 104 so that the pressing plate 140 abuts against the upper side surface of the ceramic ring 200, and fixedly connect the guide rod 105 and the connecting block 130 through the pin.

[0044] In this embodiment, a wire 150 is arranged on the outer cylinder 100. The wire 150 is connected to the stud 300, and the stud 300 is energized through the wire 150.

[0045] In this embodiment, each bracket 107 includes a sliding rod and a roller 1071. The roller 1071 is rotatably arranged at the lower end of the sliding rod. The roller 1071 is used to abut against the workpiece, and the roller 1071 facilitates the sliding of the bracket 107 on the workpiece. The second connecting rod 109 is rotatably connected to the sliding rod.

[0046] In this embodiment, an arc starting block 301 is fixedly arranged at the lower end of the stud 300. In the initial state, the arc starting block 301 is located above the roller 1071. Place the outer cylinder 100 at the target position, and the roller 1071 abuts against the workpiece first. Press down the outer cylinder 100. After the lower ends of the plurality of brackets 107 move away from each other, the arc starting block 301 abuts against the workpiece again.

[0047] In this embodiment, a handle 310 is fixedly arranged on the outer cylinder 100.

[0048] Working process: First, manually rotate the brackets 107 so that the lower ends of the plurality of brackets 107 move away from each other. Then place the ceramic ring 200 in the first pulling ring 108 and place the first knocking bar 1081 in the first cutting groove 201. At this time, the first knocking bar 1081 limits the ceramic ring 200. Finally, install the stud 300, connect the upper end of the stud 300 to the clamping cylinder 111, and the lower end of the stud 300 is located inside the ceramic ring 200. Then release the brackets 107, and under the action of the tension spring 102, the brackets 107 reset.

[0049] After installation, place the outer cylinder 100 at the target position. The roller 1071 abuts against the workpiece, and the lower side surface of the ceramic ring 200 abuts against the workpiece. Then move the top bracket 104 so that the pressing plate 140 abuts against the upper side surface of the ceramic ring 200, and fixedly connect the guide rod 105 and the connecting block 130 through a pin.

[0050] Hold the handle 310 and press down the outer cylinder 100. When the outer cylinder 100 moves downward, drive the bracket 107 to rotate through the first connecting rod 120, and the lower ends of the multiple brackets 107 move away from each other. When the multiple brackets 107 move away from each other, drive the first pull ring 108 to move downward through the second connecting rod 109, so that a gap is generated between the upper end of the first knocking bar 1081 and the first cutting groove 201.

[0051] The outer cylinder 100 continues to descend until the arc starting block 301 abuts against the workpiece. Under the limitation of the multiple brackets 107, it can basically ensure that the welding surface of the stud 300 is perpendicular to the workpiece, and maintain the stability of the pressing direction, avoiding the skew of the stud 300 during welding.

[0052] After the arc starting block 301 abuts against the workpiece, energize the stud 300 through the wire 150. Then start the electric cylinder, and the electric cylinder drives the stud 300 to move upward. At this time, an arc is generated between the arc starting block 301 and the workpiece, and the lower end of the stud 300 and the welding surface of the workpiece are melted. Finally, the electric cylinder drives the stud 300 to move downward, so that the lower end of the stud 300 contacts and adheres to the workpiece.

[0053] After welding is completed, quickly lift the outer cylinder 100 upward. Under the action of the tension spring 102, the bracket 107 resets, the lower ends of the multiple brackets 107 approach each other, the bracket 107 drives the first pull ring 108 to move upward through the second connecting rod 109, the first pull ring 108 drives the first knocking bar 1081 to move upward, and the first knocking bar 1081 knocks the first cutting groove 201 to break the ceramic ring 200. Since the first cutting groove 201 is a prefabricated stress concentration point, when a cutting force is applied along the first cutting groove 201, the stress concentration coefficient can reach 1.8 - 2.5. This stress concentration can cause cracks to preferentially initiate at the notch and expand along a predetermined direction, forming a controllable main crack and reducing the fine particles generated by random fragmentation.

[0054] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A welding device for steel structure, characterized in that: It comprises an outer tube, a stud, a ceramic ring and an auxiliary mechanism; the outer tube is arranged vertically, the ceramic ring and the stud are arranged coaxially with the outer tube, and the stud, the ceramic ring and the outer tube are arranged in sequence from the inside to the outside; the ceramic ring can move up and down relative to the stud and the outer tube; a plurality of first cutting grooves are opened on the lower side of the ceramic ring, and the plurality of first cutting grooves are distributed along the circumference of the ceramic ring; along the direction from top to bottom, the first cutting groove is wedge-shaped, and the width of the first cutting groove along the circumference of the ceramic ring gradually increases; The auxiliary mechanism includes a first pull ring and a plurality of brackets, and the plurality of brackets are distributed along the circumference of the outer cylinder; a first connecting rod is rotatably arranged in the middle of the bracket, one end of the first connecting rod is rotatably connected to the outer cylinder, and the lower end of the bracket is used to abut against the workpiece; The first pull ring is slidably arranged on the outside of the ceramic ring up and down, and the first pull ring and the ceramic ring are coaxially arranged; a second connecting rod is rotatably arranged at the lower part of each bracket, and one end of the second connecting rod is rotatably connected to the first pull ring; the second connecting rod is inclined; a plurality of first knocking bars are fixedly arranged on the inner side of the first pull ring, and the first knocking bars are in the first cutting groove; the lower ends of the plurality of brackets are close to each other, and the brackets drive the first knocking bars to move upward, knocking on the first cutting groove to break the ceramic ring.

2. A welding device for steel structure according to claim 1, characterized in that: It also includes a clamping tube, which is coaxially arranged with the outer tube. The clamping tube is slidably arranged in the outer tube up and down, and the clamping tube is located on the upper side of the ceramic ring. The clamping tube is elastic, and the upper end of the stud is arranged in the clamping tube.

3. A welding device for steel structure according to claim 2, characterized in that: It also includes a driving mechanism, which includes an electric cylinder, which is fixedly arranged in the outer cylinder, and the extended end of the electric cylinder is vertically arranged; the clamping cylinder includes a plurality of spring pieces, which are distributed in sequence along the circumference of the stud, the extended end of the electric cylinder and the upper end of the spring piece are fixedly connected, and the lower end of the spring piece and the stud are against each other.

4. A welding device for steel structure according to claim 1, characterized in that: A moving ring is slidably arranged on the outer side of the outer cylinder, and the moving ring and the outer cylinder are arranged coaxially; the upper end of the bracket is rotatably connected to the moving ring; the auxiliary mechanism also includes a tension spring, and the tension spring connects the moving ring and the outer cylinder.

5. A welding device for steel structure according to claim 4, characterized in that: A torsion spring is arranged at the rotation connection between the bracket and the moving ring.

6. A welding device for steel structure according to claim 1, characterized in that: A connecting block is fixedly arranged on the outer cylinder, a guide groove is provided on the connecting block, and the guide groove is arranged vertically; a limiting hole is provided on the connecting block, and the limiting hole is connected with the guide groove; The auxiliary mechanism also includes a limit assembly, which includes a top frame, a pressure plate and a pin; a guide rod is fixedly arranged on the top frame, the guide rod is vertically arranged, and the guide rod is slidably arranged in the guide groove; a plurality of connecting holes are opened on the guide rod, and the plurality of connecting holes are distributed in sequence along the vertical direction; the pin passes through the limit hole and a connecting hole to limit the relative position of the guide rod and the connecting block; the pressure plate is fixedly arranged on the top frame, and the pressure plate is used to abut against the upper side of the ceramic ring.

7. A welding device for steel structure according to claim 1, characterized in that: The outer cylinder is provided with electric wires, and the electric wires are connected with the studs.

8. A welding device for steel structure according to claim 1, characterized in that: Each bracket comprises a sliding rod and a roller, the roller is rotatably arranged at the lower end of the sliding rod, the second connecting rod is rotatably connected to the sliding rod, and the roller is used to abut against the workpiece.

9. A welding device for steel structure according to claim 1, characterized in that: An arc-starting block is fixedly arranged at the lower end of the stud.

10. A welding device for steel structure according to claim 1, characterized in that: A handle is fixedly arranged on the outer cylinder.

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