A keel welding device and method based on high-altitude curved building

Abstract

The present invention relates to the technical field of keel welding, and in particular to a keel welding device and method based on a high-altitude curved building, comprising a main body, a welding assembly and an air supply assembly, wherein the welding assembly is used for automatically tracking and positioning according to the shape of the keel, wherein the welding assembly comprises a welding head for welding the keel, and image identifiers for photographing and identifying the position of the keel are fixed on both sides of the outside of the welding head, and wherein the main body is provided with an air supply assembly for providing sufficient nitrogen for welding, and wherein the air supply assembly comprises a compressor for compressing air and a gas storage tank for storing nitrogen. The present invention compresses ambient air so that the air passes through a condensation separator and a molecular separator to separate other gases, and the gas passes through the molecular separator to retain the nitrogen, and then the nitrogen is stored in the gas storage tank, and when the nitrogen is needed, the solenoid valve can be directly opened for use, and there is no need to carry too many gas tanks, thereby reducing the operation steps and improving the work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of keel welding, and in particular to a keel welding device and method based on a high-altitude curved surface building. Background Art

[0002] The building keel is a kind of building material used to support the shape and fix the structure. The keel has good load-bearing performance and rigidity, can effectively bear various loads and transfer them to the basic structure. As a supporting component inside or outside the building, it ensures the overall safety and stability of the building. Keels are also used for curved buildings. A welding machine is required when welding the keel.

[0003] Since welding is done at high altitudes, although the oxygen content is low in these areas, the weld layer will still oxidize. Inert gas is generally used for protection during welding, and external inert gas tanks are generally used. When the gas is used up, the gas tank needs to be replaced frequently, which is too troublesome and costly. Summary of the invention

[0004] The purpose of the present invention is to provide a keel welding device and method based on a high-altitude curved building. By compressing the surrounding air, the air is separated from other gases through a condensation separator and a molecular separator. The gas passes through the molecular separator to retain nitrogen, and then the nitrogen is stored in a gas storage tank. When nitrogen is needed, the solenoid valve can be directly opened for use. There is no need to carry too many gas tanks, which reduces the operating steps, improves work efficiency, and has low cost.

[0005] In order to solve the problems of the prior art, the present invention provides a keel welding device and method based on a high-altitude curved building, comprising a main body, a welding assembly and an air supply assembly, wherein the welding assembly is used to automatically track and locate according to the shape of the keel, the welding assembly comprises a welding head for welding the keel, image identifiers for photographing and identifying the position of the keel are fixed on both sides of the outside of the welding head, the main body is provided with an air supply assembly for providing sufficient nitrogen for welding, and the air supply assembly comprises a compressor for compressing air and a gas tank for storing nitrogen.

[0006] Preferably, the gas supply assembly also includes a base plate, the top of the base plate is fixed to the compressor, a condensation separator is provided on one side of the top of the base plate, and a molecular separator for separating nitrogen and other gases is provided at a position near the condensation separator on the top of the base plate.

[0007] Preferably, the compressor and the condensation separator are connected via a first air pipe, one end of the first air pipe is interconnected with the compressor, and the other end of the first air pipe is interconnected with one end of the condensation separator.

[0008] Preferably, a second air pipe is connected between the condensation separator and the molecular separator, one end of the second air pipe is interconnected with the condensation separator, and the other end of the second air pipe is interconnected with the molecular separator.

[0009] Preferably, a third air pipe is connected between the gas storage tank and the molecular separator, one end of the third air pipe is interconnected with the molecular separator, and the other end of the third air pipe is interconnected with the gas storage tank. The gas storage tank is also provided with a solenoid valve for controlling the gas, and the solenoid valve is connected to a fourth air pipe, and the other end of the fourth air pipe is connected to the welding head.

[0010] Preferably, the welding assembly also includes a fourth rotating drive member, a toothed disc is fixed at the output end of the fourth rotating drive member, and the welding assembly also includes a support sleeve, a rotating shaft rotates in the support sleeve, and both ends of the rotating shaft in the support sleeve are connected to a bevel gear and a first welding arm, and the bevel gear and the toothed disc are meshed with each other.

[0011] Preferably, a second welding arm for adjusting the position of the welding head is provided at one end of the first welding arm, and a rotating member for adjusting the orientation of the welding head is provided at one end of the second welding arm, and the rotating member is connected to the welding head via a motor.

[0012] Preferably, the main body is also provided with a flipping assembly for flipping the keel, and the flipping assembly is provided with a fixing assembly for fixing the keel.

[0013] Preferably, tracks are installed on both sides of the top of the main body, and the main body is also provided with a forward and backward moving component for moving the welding head forward and backward, the forward and backward moving component is provided with a horizontal moving component for moving the welding head left and right, the horizontal moving component is provided with a longitudinal moving component for moving the welding head up and down, and the longitudinal moving component is provided with a moving plate, and the outer part of the moving plate is fixed to the fourth rotating drive member and the support sleeve.

[0014] A method for welding keels of high-altitude curved buildings comprises the following steps:

[0015] S1: placing the keel to be welded on the fixing assembly, and fixing the keel through the fixing assembly;

[0016] S2: Move the welding head to the position of the keel by moving the front and rear moving components and the lateral moving components, and move the welding head close to the keel by moving the longitudinal moving components;

[0017] S3: By starting the compressor, the compressor compresses the surrounding air into the condensation separator, and the high-pressure gas enters and is cooled. During the cooling process, most of the water vapor and liquid impurities will condense into liquid water and be removed together with other impurities. The gas then passes through the molecular separator, which selectively separates oxygen and nitrogen, and separates the oxygen, leaving only nitrogen molecules. The nitrogen then enters the gas storage tank for storage, and the solenoid valve is opened to allow the nitrogen to be sprayed through the welding head to protect the welding layer. By starting the welding head, the welding head welds the keel;

[0018] S4: According to the shape of the keel, the fourth rotating drive member rotates to drive the gear plate to rotate, the gear plate rotates the bevel gear, and then the bevel gear rotates, the bevel gear rotates the first welding arm, and the first welding arm also has a driving structure inside to rotate the second welding arm. Similarly, the driving structure in the second welding arm rotates the rotating member, and the welding head rotates with the rotating member, and the welding head can also rotate by itself, and the angle of the welding head can be adjusted to adapt to keels of different shapes, and the device can be conveniently used for side welding of the keel by flipping the assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a first stereoscopic structural schematic diagram of a keel welding device for a high-altitude curved building.

[0020] Figure 2 The second stereoscopic structural schematic diagram is a keel welding device based on a high-altitude curved building.

[0021] Figure 3 The present invention is a first stereoscopic structural schematic diagram of a welding assembly and an air supply assembly of a keel welding device for a high-altitude curved building.

[0022] Figure 4 The present invention is a schematic diagram of the second three-dimensional structure of a welding assembly and an air supply assembly of a keel welding device for a high-altitude curved building.

[0023] Figure 5 It is a third stereoscopic structural schematic diagram of a keel welding device based on a high-altitude curved building.

[0024] Figure 6 The diagram is a left side structural diagram of a keel welding device for a high-altitude curved building.

[0025] Figure 7 The diagram is a top-down structural diagram of a keel welding device for a high-altitude curved building.

[0026] Figure 8 The present invention is a schematic diagram of the first stereoscopic structure of a flip assembly and a fixed assembly of a keel welding device for a high-altitude curved building.

[0027] Fig. 9 The present invention is a schematic diagram of the second three-dimensional structure of a flip assembly and a fixed assembly of a keel welding device for a high-altitude curved building.

[0028] Fig.10 It is a keel welding equipment based on high-altitude curved buildings. Figure 8 Enlarged structural diagram at A in the middle.

[0029] The numbers in the figure are: 1, main body; 11, front and rear moving assembly; 111, first rotating drive member; 112, moving wheel; 113, support column; 12, lateral moving assembly; 121, first slide rail; 122, first lead screw; 123, second rotating drive member; 124, support plate; 125, crossbeam; 13, longitudinal moving assembly; 131, second slide rail; 132, third rotating drive member; 133, second lead screw; 14, moving plate; 15, welding assembly; 151, fourth rotating drive member; 152, toothed disc; 153, support sleeve; 154, bevel gear; 155, first welding Connecting arm; 156, second welding arm; 157, rotating part; 158, welding head; 159, image identifier; 16, air supply assembly; 161, bottom plate; 162, compressor; 163, condensation separator; 164, gas storage tank; 165, molecular separator; 166, first air pipe; 167, second air pipe; 168, third air pipe; 169, solenoid valve; 1610, fourth air pipe; 17, flip assembly; 171, flip frame; 172, fifth rotating drive member; 173, connecting frame; 18, fixing assembly; 181, fixing seat; 182, clamping motor; 183, pressing piece. DETAILED DESCRIPTION

[0030] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Reference Figure 1 — Fig.10As shown, the present invention provides: a keel welding device and method based on a high-altitude curved building, including a main body 1, a welding assembly 15 and an air supply assembly 16, the welding assembly 15 is used to automatically track and locate according to the shape of the keel to ensure the accuracy and consistency of the welding position, the welding assembly 15 includes a welding head 158 for welding the keel, and image recognizers 159 for photographing and identifying the position of the keel are fixed on both sides of the outside of the welding head 158, and the image recognizer 159 is used to photograph and identify the position and shape of the keel. It converts the photographed image into a digital signal through image processing technology, and transmits it to the control system for analysis and processing. The control system adjusts the position and posture of the welding head 158 according to the analysis results to ensure the accuracy and stability of the welding process. The main body 1 is provided with a gas supply assembly 16 for providing sufficient nitrogen for welding. The gas supply assembly 16 includes a compressor 162 for compressing air and a gas storage tank 164 for storing nitrogen. The gas supply assembly 16 also includes a bottom plate 161. The top of the bottom plate 161 is fixed to the compressor 162. A condensation separator 163 is provided on one side of the top of the bottom plate 161. A molecular separator 165 for separating nitrogen and other gases is provided at the top of the bottom plate 161 near the condensation separator 163.

[0032] In this embodiment, the compressor 162 is started, and the compressor 162 compresses the surrounding air, and the air enters the condensation separator 163, and the high-pressure gas enters and is cooled. During the cooling process, most of the water vapor and liquid impurities will condense into liquid water and be removed together with other impurities. Then the gas passes through the molecular separator 165, and the molecular separator 165 selectively separates nitrogen and other gases, and separates the nitrogen. Then the nitrogen enters the gas storage tank 164 for storage. When it is used, it only needs to open the solenoid valve 169 to release the nitrogen for protection of the welding layer. There is no need to replace the gas tank later, which reduces the subsequent operation steps, improves the work efficiency, and has a low cost.

[0033] The compressor 162 and the condensation separator 163 are connected by a first air pipe 166, one end of the first air pipe 166 is interconnected with the compressor 162, and the other end of the first air pipe 166 is interconnected with one end of the condensation separator 163, and the air compressed by the compressor 162 enters the condensation separator 163 through the first air pipe 166. A second air pipe 167 is connected between the condensation separator 163 and the molecular separator 165, and the condensation separator 163 is used to separate the moisture and other condensates in the compressed air to ensure the purity of the gas used subsequently. One end of the second air pipe 167 is interconnected with the condensation separator 163, and the other end of the second air pipe 167 is interconnected with the molecular separator 165, and the gas processed by the condensation separator 163 enters the molecular separator 165 through the second air pipe 167. A third gas pipe 168 is connected between the gas storage tank 164 and the molecular separator 165. One end of the third gas pipe 168 is interconnected with the molecular separator 165. The molecular separator 165 is used to further separate nitrogen and other gases from the gas processed by the condensation separator 163 to ensure that the purity of the nitrogen supplied to the welding head 158 meets the requirements. The other end of the third gas pipe 168 is interconnected with the gas storage tank 164. The gas storage tank 164 is also provided with a solenoid valve 169 for controlling the gas. The solenoid valve 169 is connected to the fourth gas pipe 1610. The other end of the fourth gas pipe 1610 is connected to the welding head 158. When welding is required, the solenoid valve 169 is opened, and the nitrogen in the gas storage tank 164 is supplied to the welding head 158 through the fourth gas pipe 1610 for the welding process.

[0034] The welding assembly 15 also includes a fourth rotating driving member 151, and a toothed disc 152 is fixed to the output end of the fourth rotating driving member 151. The welding assembly 15 also includes a support sleeve 153, and a rotating shaft rotates in the support sleeve 153. Both ends of the rotating shaft in the support sleeve 153 are connected with a bevel gear 154 and a first welding arm 155. The bevel gear 154 and the toothed disc 152 are meshed with each other. A second welding arm 156 for adjusting the position of a welding head 158 is provided at one end of the first welding arm 155, and a rotating member 157 for adjusting the orientation of the welding head 158 is provided at one end of the second welding arm 156. The rotating member 157 is interconnected with the welding head 158 through a motor.

[0035] In this embodiment, by starting the second rotating drive member 123, the second rotating drive member 123 causes the first screw 122 to rotate, and the first screw 122 causes the support plate 124 to move left and right. Subsequently, by starting the third rotating drive member 132, the third rotating drive member 132 causes the second screw 133 to rotate, and the second screw 133 causes the movable plate 14 to move up and down, so that the welding head 158 is close to the keel for welding.

[0036] The main body 1 is also provided with a flip assembly 17 for flipping the keel, and the flip assembly 17 is provided with a fixing assembly 18 for fixing the keel. The flip assembly 17 includes a connecting frame 173, and the connecting frame 173 is fixed on the main body 1. A flip frame 171 for flipping the keel is movably provided between the connecting frames 173. A fifth rotating driving member 172 is fixed to the outside of the connecting frame 173, and the output end of the fifth rotating driving member 172 is connected to the flip frame 171.

[0037] In this embodiment, by starting the fifth rotating driving member 172, the fifth rotating driving member 172 can rotate the connecting frame 173 to flip the keel to a certain angle, so as to facilitate welding of the side of the keel.

[0038] The fixing assembly 18 includes a fixing seat 181, which is fixed to the top of the flip frame 171 by bolts. A clamping motor 182 is fixed to the outside of the fixing seat 181, and a pressing piece 183 is connected to the output end of the clamping motor 182, which presses on the keel.

[0039] In this example, the keel is placed on the fixing seat 181 and then the clamping motor 182 is started. The clamping motor 182 rotates the pressing piece 183 and the pressing piece 183 presses the keel onto the fixing seat 181, thereby fixing the keel.

[0040] Tracks are installed on both sides of the top of the main body 1. The main body 1 is also provided with a forward and backward moving component 11 for moving the welding head 158 forward and backward. The forward and backward moving component 11 is provided with a lateral moving component 12 for moving the welding head 158 left and right. The lateral moving component 12 is provided with a longitudinal moving component 13 for moving the welding head 158 up and down. The longitudinal moving component 13 is provided with a moving plate 14, and the outer part of the moving plate 14 is fixed to the fourth rotating drive member 151 and the support sleeve 153.

[0041] The forward and backward moving component 11 includes a support column 113, the outside of the support column 113 is fixed to the base plate 161, a moving wheel 112 is movably arranged at the bottom of the support column 113 through an axis, a first rotating driving component 111 is fixed to the outside of the support column 113 through bolts, the output end of the first rotating driving component 111 is interconnected with the moving wheel 112 and is used to drive the moving wheel 112 to rotate, and the moving wheel 112 cooperates with the track on the main body 1.

[0042] In this embodiment, by starting the first rotary drive member 111, the first rotary drive member 111 rotates the moving wheel 112, and the support column 113 moves to a suitable position, so that the welding head 158 can be adjusted forward and backward.

[0043] The lateral movement assembly 12 includes a crossbeam 125, which is fixed on the support column 113. A first slide rail 121 is fixed to the outside of the crossbeam 125 by bolts. A support plate 124 is slidably arranged on the first slide rail 121. A first lead screw 122 is movably arranged at the center of the crossbeam 125 through a bearing seat. The first lead screw 122 and the back of the support plate 124 are connected to each other through a threaded sleeve. A second rotating drive member 123 is fixed to one side of the crossbeam 125. The output end of the second rotating drive member 123 is connected to one end of the first lead screw 122 and is used to drive the first lead screw 122 to rotate.

[0044] In this example, by starting the second rotary drive member 123, the second rotary drive member 123 rotates the first lead screw 122, and the first lead screw 122 moves the support plate 124 left and right, so that the welding head 158 can be moved left and right.

[0045] The longitudinal moving component 13 includes a second slide rail 131, and the second slide rail 131 is fixed on the support plate 124. The second slide rail 131 is interconnected with the back of the moving plate 14 through a slider. The longitudinal moving component 13 also includes a second lead screw 133, and the second lead screw 133 is movably arranged on the support plate 124 through a bearing seat. The support plate 124 is interconnected with the back of the moving plate 14 through a threaded sleeve. A third rotating driving member 132 is fixed on the top of the support plate 124, and the output end of the third rotating driving member 132 is interconnected with one end of the second lead screw 133 and is used to drive the second lead screw 133 to rotate.

[0046] In this embodiment, the third rotary drive member 132 is started, the third rotary drive member 132 causes the second lead screw 133 to rotate, and the second lead screw 133 causes the movable plate 14 to move up and down, so that the welding head 158 can move up and down.

[0047] Working principle: When in use, the keel is placed on the fixed seat 181, and then the clamping motor 182 is started, the clamping motor 182 rotates the pressing piece 183, and the pressing piece 183 presses the keel onto the fixed seat 181, and then the first rotating driving member 111 is started, the first rotating driving member 111 rotates the moving wheel 112, and the support column 113 is moved to a suitable position, and then the second rotating driving member 123 is started, the second rotating driving member 123 rotates the first lead screw 122, and the first lead screw 122 moves the support plate 124 left and right, and then the third rotating driving member 132 is started, the third rotating driving member 132 rotates the second lead screw 133, and the second lead screw 133 moves the moving plate 14 up and down, so that the welding head 158 is close to the keel, and the welding head 158 starts to weld the keel. At the same time, by starting the compressor 162, the compressor 162 compresses the surrounding air into the condensation separator 163, and the high-pressure gas is cooled after entering. During the cooling process, most of the water vapor and liquid impurities will condense into liquid water and be removed together with other impurities. Then the gas passes through the molecular separator 165, which selectively separates oxygen and nitrogen, and separates the oxygen, leaving only nitrogen molecules. Then the nitrogen enters the gas storage tank 164 for storage, and is opened by the solenoid valve 169 to allow the nitrogen to be sprayed through the welding head 158 to protect the welding layer. By starting the welding head 158, the welding head 158 welds the keel, and the nitrogen can prevent the material from being damaged by oxidation, thereby improving the cutting quality. In metal surface treatment, nitrogen can form a nitride layer on the metal surface to improve its hardness, wear resistance and corrosion resistance, and according to the keel The fourth rotating driving member 151 rotates to drive the toothed disc 152 to rotate, the toothed disc 152 rotates the bevel gear 154, the bevel gear 154 rotates the first welding arm 155, and the first welding arm 155 also has a driving structure inside to rotate the second welding arm 156. Similarly, the driving structure in the second welding arm 156 rotates the rotating member 157, and the welding head 158 rotates with the rotating member 157, and the welding head 158 can also rotate automatically, and the angle of the welding head 158 is adjusted to adapt to keels of different shapes. By starting the fifth rotating driving member 172, the fifth rotating driving member 172 can rotate the connecting frame 173 to flip the keel at a certain angle, so as to facilitate welding of the side of the keel.

[0048] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A keel welding device for high-altitude curved buildings, characterized in that: The invention comprises a main body (1), a welding assembly (15) and an air supply assembly (16), wherein the welding assembly (15) is used for automatically tracking and positioning according to the shape of the keel, the welding assembly (15) comprises a welding head (158) for welding the keel, and image recognition devices (159) for photographing and identifying the position of the keel are fixed on both sides of the outside of the welding head (158), and the main body (1) is provided with an air supply assembly (16) for providing sufficient nitrogen for welding, and the air supply assembly (16) comprises a compressor (162) for compressing air and a gas storage tank (164) for storing nitrogen; The gas supply assembly (16) further comprises a bottom plate (161), the top of the bottom plate (161) being fixed to the compressor (162), a condensation separator (163) being arranged on one side of the top of the bottom plate (161), and a molecular separator (165) for separating nitrogen from other gases being arranged at a position near the condensation separator (163) on the top of the bottom plate (161); The compressor (162) and the condensation separator (163) are connected via a first air pipe (166), one end of the first air pipe (166) is interconnected with the compressor (162), and the other end of the first air pipe (166) is interconnected with one end of the condensation separator (163); A second air pipe (167) is connected between the condensation separator (163) and the molecular separator (165); one end of the second air pipe (167) is interconnected with the condensation separator (163), and the other end of the second air pipe (167) is interconnected with the molecular separator (165); A third gas pipe (168) is connected between the gas storage tank (164) and the molecular separator (165); one end of the third gas pipe (168) is interconnected with the molecular separator (165); the other end of the third gas pipe (168) is interconnected with the gas storage tank (164); a solenoid valve (169) for controlling gas is also provided on the gas storage tank (164); a fourth gas pipe (1610) is connected to the solenoid valve (169); the other end of the fourth gas pipe (1610) is connected to the welding head (158).

2. The keel welding equipment for high-altitude curved buildings according to claim 1 is characterized in that: The welding assembly (15) further comprises a fourth rotating driving member (151), a toothed disc (152) being fixed to the output end of the fourth rotating driving member (151), and the welding assembly (15) further comprises a supporting sleeve (153), a rotating shaft rotating in the supporting sleeve (153), a bevel gear (154) and a first welding arm (155) being connected at both ends of the rotating shaft in the supporting sleeve (153), and the bevel gear (154) and the toothed disc (152) being meshed with each other.

3. The keel welding equipment for high-altitude curved buildings according to claim 2 is characterized in that: A second welding arm (156) for adjusting the position of a welding head (158) is disposed at one end of the first welding arm (155); a rotating member (157) for adjusting the orientation of the welding head (158) is disposed at one end of the second welding arm (156); the rotating member (157) is connected to the welding head (158) via a motor.

4. The keel welding equipment for high-altitude curved buildings according to claim 1 is characterized in that: The main body (1) is also provided with a flipping assembly (17) for flipping the keel, and the flipping assembly (17) is provided with a fixing assembly (18) for fixing the keel.

5. The keel welding equipment for high-altitude curved buildings according to claim 1 is characterized in that: Tracks are installed on both sides of the top of the main body (1), and the main body (1) is also provided with a forward and backward moving component (11) for moving the welding head (158) forward and backward, and the forward and backward moving component (11) is provided with a lateral moving component (12) for moving the welding head (158) left and right, and the lateral moving component (12) is provided with a longitudinal moving component (13) for moving the welding head (158) up and down, and the longitudinal moving component (13) is provided with a moving plate (14), and the outer portion of the moving plate (14) is fixed to the fourth rotating drive member (151) and the support sleeve (153).

6. A method for welding keels of high-altitude curved buildings, using a keel welding device for high-altitude curved buildings according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: placing the keel to be welded on the fixing assembly (18), and fixing the keel by the fixing assembly (18); S2: moving the welding head (158) to the position of the keel by moving the front-to-back moving assembly (11) and the lateral moving assembly (12), and moving the welding head (158) close to the keel by moving the longitudinal moving assembly (13); S3: By starting the compressor (162), the compressor (162) compresses the surrounding air into the condensation separator (163), and the high-pressure gas is cooled after entering. During the cooling process, most of the water vapor and liquid impurities will condense into liquid water and be removed together with other impurities. Then the gas passes through the molecular separator (165), and the molecular separator (165) selectively separates oxygen and nitrogen, and separates the oxygen, leaving only nitrogen molecules. Then the nitrogen enters the gas storage tank (164) for storage, and is opened by the solenoid valve (169) so that the nitrogen is sprayed out through the welding head (158) to protect the welding layer. By starting the welding head (158), the welding head (158) welds the keel; S4: According to the shape of the keel, the fourth rotating driving member (151) can rotate to drive the toothed disc (152) to rotate, the toothed disc (152) rotates the bevel gear (154), and then the bevel gear (154) rotates, the bevel gear (154) rotates the first welding arm (155), and the first welding arm (155) also has a driving structure inside to rotate the second welding arm (156). Similarly, the driving structure in the second welding arm (156) rotates the rotating member (157), and the welding head (158) rotates with the rotating member (157), and the welding head (158) can also rotate by itself, and the angle of the welding head (158) is adjusted to adapt to keels of different shapes, and the device can be conveniently used to weld the side of the keel by turning the assembly (17).

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