Pipe truss steel structure manufacturing welding forming process

Abstract

The present application relates to steel structure welding technical field, disclose a kind of pipe truss steel structure manufacturing welding forming process, comprising the following steps: starting welding gun module to make its welding gun align two steel pipe welding port;Start output source to drive first placement cylinder and second placement cylinder synchronous rotation, then welding gun module can be welded to the port of two steel pipes, form weld;Weld can be arranged after first cooling, to remove residual slag and arrange weld, then after second cooling to weld by rotating grinding disc polishing weld, to realize depth cleaning, ensure no slag defect, realize when multilayer multi-pass welding is carried out to steel pipe port, each layer weld is arranged in time after welding, to remove slag and splash, avoid defect accumulation, so that ensure the purity of each layer weld, to improve the stability of steel pipe port welding, then after welding steel pipe and other steel pipe are welded, the pipe truss made is more stable.

Description

Technical Field

[0001] This invention relates to the field of steel structure welding technology, specifically to a welding and forming process for fabricating tubular truss steel structures. Background Technology

[0002] Tubular truss steel structures are a type of steel structure assembled from many steel pipes according to specific geometric shapes and connection methods. They possess advantages such as spatial structural stability, high load-bearing capacity, and aesthetic appeal. This type of structure is widely used in construction projects requiring high load-bearing capacity and large spaces, such as stadiums, exhibition centers, airports, and large bridges. In these applications, the tubular truss structure not only needs to withstand various external forces but also meet aesthetic design requirements. During the welding process of tubular truss steel structures, when the chord length exceeds the material's standard length, the ends of two steel pipes must be butt-welded together. However, the curved surface of the steel pipes is difficult to position and clamp during welding, and the pipes are prone to displacement during the welding process, leading to skewed welded products.

[0003] To address the aforementioned technical problems, some existing technologies exist that can adaptively clamp the curved surface of the steel pipe to ensure that the steel pipe does not shift during butt welding. For example, patent publication number CN113210914B primarily employs a locking mechanism to fix one end of the truss to a positioning hollow column, and then uses an adjustment mechanism to adjust the spacing between the truss rods fitted onto the positioning hollow column. This allows for fixing trusses of different sizes, facilitating welding and forming of the truss. Simultaneously, a rotating mechanism can rotate the truss. However, analysis reveals that this technical solution has drawbacks: butt welding of the steel pipe ends typically involves segmented, multi-layer, and multi-pass welding. Each layer requires timely cleaning of weld slag and spatter to prevent defect accumulation. Existing welding processes cannot automatically clean weld slag and tidy the weld seam after each layer, leading to the potential presence of weld slag and impurities in subsequent layers, resulting in poor end welding stability. Therefore, this invention provides a welding and forming process for truss steel structures that automatically cleans the weld seam after each layer. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a welding process for the fabrication of tubular truss steel structures, thereby solving the technical problem of the inability to promptly clean welding slag and spatter after each layer of welding.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A process for fabricating and welding a tubular truss steel structure, comprising the following steps:

[0007] Step S1: Cut the steel pipe to the required length according to the manufacturing requirements, and ensure that the cut is smooth and burr-free;

[0008] Step S2: Remove the oxide scale from the surface of the steel pipe to be welded and the cut steel pipe;

[0009] Step S3: Insert the steel pipe to be welded into the through hole of the second placement cylinder and place it on the clamping ring located below;

[0010] Step S4: Insert the cut steel pipe into the through hole of the first placement cylinder and place it on the clamping ring located below;

[0011] Step S5: Start the drive source to move the clamping rings on both sides of each steel pipe toward each other to clamp the steel pipe, and the steel pipe is coaxial with the through hole, and the welded ends of the two steel pipes are located inside the positioning ring;

[0012] Step S6: Activate the welding torch module so that its welding torch is aligned with the welding ports of the two steel pipes;

[0013] Step S7: Start the output source to drive the first placement cylinder and the second placement cylinder to rotate synchronously, so that the welding gun module can weld the ends of the two steel pipes to form a weld.

[0014] Step S8: The weld seam after welding is transferred to the first cooling component for the first cooling process;

[0015] Step S9: After the first cooling, the weld is rotated to the stainless steel brush. At the same time, when the second placement cylinder rotates, the stainless steel brush is driven by the transmission component to reciprocate linearly along the axis of the second placement cylinder. This can clean the weld and the surface of the steel pipe around the weld, remove residual welding slag and tidy up the weld, and avoid the aggravation of metal oxidation at high temperature.

[0016] Step S10: After being cleaned with a stainless steel brush, the weld is rotated to the second cooling component for a second cooling process to further reduce the temperature of the weld.

[0017] Step S11: After the second cooling, the weld is rotated to the grinding disc. The power source drives the grinding disc to rotate to grind the weld, achieving deep cleaning and ensuring no slag inclusions.

[0018] Step S12: The weld seam, after being ground by the grinding wheel, is rotated to the welding gun module for re-welding;

[0019] Step S13: Repeat steps S7 to S12 to achieve multi-layer, multi-pass welding of the steel pipe end;

[0020] Step S14: After welding is completed, turn off the welding gun module and the output source at the same time so that the first placement cylinder and the second placement cylinder rotate a full number of revolutions and then stop. Then turn on the drive source to move the clamping ring to release the clamp on the steel pipe so that the welded steel pipe can be taken out.

[0021] Preferably, the process is applied to a tubular truss steel structure fabrication and welding equipment, the equipment comprising:

[0022] The first placement cylinder is rotatably mounted on the equipment base and is symmetrically arranged with the second placement cylinder. The second placement cylinder is rotatably mounted on the equipment base, and the opposite ends of the first and second placement cylinders are respectively engaged with the two ends of the positioning ring. The positioning ring is fixed on the equipment base, and the positioning ring is rotatably engaged with both the first and second placement cylinders. Both the first and second placement cylinders are provided with through holes along the axial direction, and the equipment base is equipped with an output source for driving the first and second placement cylinders to rotate.

[0023] Clamping rings: Two symmetrically arranged clamping rings are slidably installed inside both the first and second placement cylinders. Both the first and second placement cylinders are provided with a drive source for driving the clamping rings to translate.

[0024] The welding torch module is mounted on the positioning ring, and its welding torch is aligned with the end of the steel pipe located inside the positioning ring;

[0025] A stainless steel brush is fixed to a first mounting bracket, which is slidably mounted on a positioning ring. A transmission assembly connected to the first mounting bracket is mounted on the positioning ring. A first cooling element is mounted on the positioning ring and is located between the welding torch module and the stainless steel brush. When the second placement cylinder rotates, the surface of the steel pipe, after being welded by the welding torch of the welding torch module, rotates towards the first cooling element. The second placement cylinder, through the transmission assembly, drives the stainless steel brush to reciprocate linearly along the axial direction of the second placement cylinder.

[0026] The grinding disc is rotatably mounted on a positioning ring and driven to rotate by a power source mounted on the positioning ring. A second cooling element is mounted on the positioning ring and is located between the stainless steel brush and the grinding disc. The grinding disc is located between the welding gun module and the second cooling element.

[0027] Preferably, a second mounting bracket is slidably mounted on the positioning ring, and a cleaning block is fixed on the second mounting bracket. The cleaning block is in contact with the outer surface of the end of the steel pipe located inside the positioning ring, and the cleaning block is located between the welding gun module and the grinding disc. The second mounting bracket is fixedly connected to the first mounting bracket through a connecting rod.

[0028] Preferably, a wiping cotton is also fixed on the second mounting bracket, and the wiping cotton is located between the welding gun module and the cleaning block.

[0029] Preferably, the transmission assembly includes:

[0030] A gear ring is coaxially and fixedly connected to the second placement cylinder. The gear ring meshes with a gear, and the gear is rotatably mounted on the inner wall of the positioning ring.

[0031] A worm gear, coaxially and fixedly connected to a gear, and meshing with a worm wheel, the worm wheel being rotatably mounted on the inner wall of a positioning ring; and

[0032] A half gear is fixedly connected to the worm gear on the same axis, and its central axis is arranged perpendicular to the central axis of the second placement cylinder. The half gear meshes with the rack frame, and the rack frame is slidably installed on the inner wall of the positioning ring. The rack frame is fixedly connected to the connecting rod.

[0033] Preferably, the first cooling element is a cooling plate, which is connected to an external cooler, and the first cooling element is in contact with the outer surface of the steel pipe on both sides of the weld.

[0034] Preferably, the second cooling element is a heat exchange plate, and it is connected to a coolant tank mounted on a positioning ring, wherein the coolant tank is connected to a circulating pump.

[0035] The beneficial effects of this invention are:

[0036] (1) In this invention, when the steel pipe is rotated by the first placement cylinder and the second placement cylinder for welding, the second placement cylinder drives the stainless steel brush to reciprocate linearly along the axial direction of the second placement cylinder through the transmission component. This allows the weld to be cleaned after the first cooling of the weld to remove residual welding slag and clean the weld, and to avoid the aggravation of metal oxidation at high temperature. After the weld is cooled for the second time, the weld is ground by the rotating grinding disc to achieve deep cleaning and ensure that there are no slag inclusions. Then the weld will rotate to the welding gun module for the next layer of welding. This allows the weld to be cleaned in time after each layer of welding when multiple layers and multiple passes are welded to the steel pipe end, in order to remove welding slag and spatter and avoid the accumulation of defects. This ensures the purity of each layer of weld and improves the stability of the steel pipe end welding. After the welded steel pipe is welded with other steel pipes, the resulting pipe truss is more stable.

[0037] (2) In this invention, before the weld seam after being ground by the grinding disc rotates to the welding gun module, it will first turn to the cleaning block. The cleaning block, which moves in a reciprocating linear motion synchronously with the stainless steel brush, can remove dust from the ground weld seam to remove debris. Then the weld seam turns to contact the wiping cotton. The wiping cotton, which moves in a reciprocating linear motion synchronously, can dry the weld seam so that it can be welded again when it is turned to the welding gun module.

[0038] (3) In this invention, the weld is cooled in stages during the interval between welding on both sides by using two cooling components. This can avoid the problem of thermal stress concentration caused by a sudden drop in temperature after welding. In addition, with the appropriate cleaning method, the weld can be cleaned in a targeted and step-by-step manner, and the weld slag and impurities can be cleaned while ensuring the stability of the weld. Attached Figure Description

[0039] The invention will now be further described with reference to the accompanying drawings.

[0040] Figure 1 This is a schematic diagram of the overall process flow of the present invention;

[0041] Figure 2 This is a schematic diagram of the structure of the first placement tube in this invention;

[0042] Figure 3 This is a schematic diagram of the structure of the second placement tube in this invention;

[0043] Figure 4 This is a schematic diagram of the positioning ring in this invention;

[0044] Figure 5 This is a schematic diagram of the welding gun module in this invention;

[0045] Figure 6 This is a schematic diagram of the stainless steel brush in this invention;

[0046] Figure 7 This is a schematic diagram of the transmission component in this invention;

[0047] Figure 8 In this invention Figure 7 A magnified schematic diagram of the structure at point A.

[0048] In the diagram: 1. First placement cylinder; 2. Second placement cylinder; 3. Positioning ring; 4. Clamping ring; 5. Drive source; 6. Output source; 7. Welding torch module; 8. First cooling component; 9. Stainless steel brush; 10. First mounting bracket; 11. Second cooling component; 12. Coolant tank; 13. Grinding disc; 14. Power source; 15. Cleaning block; 16. Wiping cotton; 17. Second mounting bracket; 18. Connecting rod; 19. Transmission assembly; 1901. Gear ring; 1902. Gear; 1903. Worm; 1904. Worm wheel; 1905. Half gear; 1906. Rack frame. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] Please see Figures 1-8 As shown, this invention is a process for fabricating and welding a tubular truss steel structure, comprising the following steps:

[0051] Step S1: Cut the steel pipe to the required length according to the manufacturing requirements, and ensure that the cut is smooth and burr-free;

[0052] Step S2: Remove the oxide scale from the surface of the steel pipe to be welded and the cut steel pipe;

[0053] Step S3: Insert the steel pipe to be welded into the through hole of the second placement cylinder 2 and place it on the clamping ring 4 located below.

[0054] Step S4: Insert the cut steel pipe into the through hole of the first placement cylinder 1 and place it on the clamping ring 4 located below.

[0055] Step S5: Start the drive source 5 to move the clamping rings 4 on both sides of each steel pipe toward each other to clamp the steel pipe, and the steel pipe is coaxial with the through hole, and the welding port of the two steel pipes is located inside the positioning ring 3;

[0056] Step S6: Activate the welding torch module 7 so that its welding torch is aligned with the welding ports of the two steel pipes;

[0057] Step S7: Start the output source 6 to drive the first placement cylinder 1 and the second placement cylinder 2 to rotate synchronously, so that the welding gun module 7 can weld the ends of the two steel pipes to form a weld.

[0058] Step S8: The weld seam after welding is transferred to the first cooling component 8 for the first cooling process;

[0059] Step S9: After the first cooling, the weld is rotated to the stainless steel brush 9. At the same time, when the second placement cylinder 2 rotates, the stainless steel brush 9 is driven to reciprocate linearly along the axis of the second placement cylinder 2 through the transmission component 19. This can clean the weld and the surface of the steel pipe around the weld, remove residual welding slag and clean the weld, and avoid the aggravation of metal oxidation at high temperature.

[0060] Step S10: After being cleaned by the stainless steel brush 9, the weld is rotated to the second cooling component 11 for a second cooling process, so that the temperature of the weld is reduced again.

[0061] Step S11: After the second cooling, the weld is rotated to the grinding disc 13. The power source 14 drives the grinding disc 13 to rotate to grind the weld, achieve deep cleaning, and ensure that there are no slag inclusions.

[0062] Step S12: The weld seam, after being ground by the grinding disc 13, is rotated to the welding gun module 7 for re-welding;

[0063] Step S13: Repeat steps S7 to S12 to achieve multi-layer, multi-pass welding of the steel pipe end;

[0064] Step S14: After welding is completed, turn off the welding gun module 7 and the output source 6 to make the first placement cylinder 1 and the second placement cylinder 2 rotate a full number of revolutions and then stop. Then start the drive source 5 to make the clamping ring 4 move to release the clamp on the steel pipe so that the welded steel pipe can be taken out.

[0065] like Figures 2-6 As shown, in a preferred embodiment of the present invention, the process is applied to a tubular truss steel structure fabrication and welding forming equipment, the equipment comprising:

[0066] The first placement cylinder 1 is rotatably mounted on the equipment base and is symmetrically arranged with the second placement cylinder 2. The second placement cylinder 2 is rotatably mounted on the equipment base, and the opposite ends of the first placement cylinder 1 and the second placement cylinder 2 are respectively engaged with the two ends of the positioning ring 3. The positioning ring 3 is fixed on the equipment base, and the positioning ring 3 is rotatably engaged with both the first placement cylinder 1 and the second placement cylinder 2. Both the first placement cylinder 1 and the second placement cylinder 2 are provided with through holes along the axial direction, and the equipment base is equipped with an output source 6 for driving the first placement cylinder 1 and the second placement cylinder 2 to rotate.

[0067] Two symmetrically arranged clamping rings 4 are slidably installed inside the clamping ring 4, the first placement cylinder 1, and the second placement cylinder 2. The first placement cylinder 1 and the second placement cylinder 2 are each provided with a drive source 5 for driving the clamping rings 4 to translate.

[0068] The welding torch module 7 is mounted on the positioning ring 3, and its welding torch is aligned with the end of the steel pipe located inside the positioning ring 3.

[0069] The stainless steel brush 9 is fixed on the first mounting bracket 10, which is slidably mounted on the positioning ring 3. The positioning ring 3 is equipped with a transmission component 19 connected to the first mounting bracket 10. The positioning ring 3 is also equipped with a first cooling component 8, which is located between the welding gun module 7 and the stainless steel brush 9. When the second placement cylinder 2 rotates, the surface of the steel pipe is welded by the welding gun of the welding gun module 7 and then rotates toward the first cooling component 8. The second placement cylinder 2 drives the stainless steel brush 9 to reciprocate linearly along the axial direction of the second placement cylinder 2 through the transmission component 19.

[0070] The grinding disc 13 is rotatably mounted on the positioning ring 3 and driven to rotate by the power source 14 mounted on the positioning ring 3. A second cooling element 11 is mounted on the positioning ring 3 and is located between the stainless steel brush 9 and the grinding disc 13. The grinding disc 13 is located between the welding gun module 7 and the second cooling element 11.

[0071] In one embodiment, the first placement cylinder 1 includes two symmetrically arranged first half-cylinders hinged together. The second placement cylinder 2 includes two symmetrically arranged second half-cylinders hinged together. After welding stops, the first and second half-cylinders can be flipped over to clean the welding space. Welding within the cylinders enables dust-free welding, reducing the adverse effects of environmental impurities on the welding process. Each end of the first placement cylinder 1 and the second placement cylinder 2 has a locking groove. The two ends of the positioning ring 3 each have locking rings, which slide in conjunction with the two locking grooves. The positioning ring 3 contains an alignment ring; the weldable end of the steel pipe can be moved to this position. The output source 6 can be a motor assembly, a gear assembly driven by a motor, or a pulley assembly, as long as it allows the first placement cylinder 1 and the second placement cylinder 2 to rotate. This embodiment does not impose specific limitations. The output source 6 includes an encoder to control the number of rotations at its output end, which is prior art. This embodiment will not be described in detail here; two symmetrically arranged clamping rings 4 are provided at the end of the through hole away from the positioning ring 3, and the two clamping rings 4 are driven by two drive sources 5 respectively. The drive source 5 can be a hydraulic cylinder, a pneumatic cylinder or other components that can achieve linear motion. This embodiment will not be specifically limited here; the welding gun module 7 includes a welding gun and a drive component for driving the welding gun to move and open. The drive component includes a hydraulic cylinder and a welding gun power supply, etc., which are existing technologies and will not be described in detail here; the power source 14 can be a motor assembly, or a gear assembly or pulley assembly driven by a motor, as long as it can make the grinding disc 13 rotate for grinding. This embodiment will not be specifically limited here; the drive source 5, output source 6, welding gun module 7, first cooling component 8, second cooling component 11, power source 14 and other electrical components are all connected to an external controller. The external controller is existing technology and this application has not improved it. Therefore, it is not necessary to disclose its specific mechanical structure and circuit structure, and it does not affect the integrity of this application.

[0072] In practical application, this embodiment involves cutting steel pipes to the required length according to manufacturing needs, ensuring a smooth, burr-free cut. Then, the oxide scale on the surface of both the steel pipe to be welded and the cut steel pipe is removed. Next, the steel pipe to be welded is inserted into the through hole of the second placement cylinder 2 and placed on the clamping ring 4 located below it. Then, the cut steel pipe is inserted into the through hole of the first placement cylinder 1 and placed on the clamping ring 4 located below it, with the welding ends of both steel pipes positioned within the positioning ring 3. Finally, the drive source 5 on both the first and second placement cylinders is activated to activate the drive source 5 on the first placement cylinder 1. The two clamping rings 4 move the same distance to clamp the cut steel pipe, and at the same time, the two clamping rings 4 on the second placement cylinder 2 move the same distance to clamp the steel pipe to be welded. Then, the welding gun module 7 is activated so that its welding gun is aligned with the welding ports of the two steel pipes. Subsequently, the output source 6 is activated to drive the first placement cylinder 1 and the second placement cylinder 2 to rotate synchronously, so that the welding gun module 7 can weld the ports of the two steel pipes to form a weld. The welded seam is then transferred to the first cooling component 8 for the first cooling to reduce the weld temperature to 200°C. When the second placement cylinder 2 rotates, it drives the stainless steel brush 9 along the second placement cylinder 2 via the transmission component 19. The axial reciprocating linear motion of the cylinder 2, after the first cooling, causes the weld to rotate to the stainless steel brush 9. The reciprocating movement of the stainless steel brush 9 cleans the weld and the surrounding steel pipe surface, removing residual weld slag and tidying up the weld, while preventing accelerated metal oxidation at high temperatures. The weld then rotates to the second cooling element 11 for a second cooling, further reducing the weld temperature. Next, the weld rotates to the grinding disc 13, where the power source 14 drives the grinding disc 13 to rotate and grind the weld, achieving deep cleaning and ensuring no slag inclusions. After grinding, the weld rotates to the welding gun module 7 for re-welding. This reciprocating motion achieves the desired cleaning of the steel... After the multi-layer, multi-pass welding of the pipe end is completed, the welding gun module 7 is turned off, and the output source 6 is turned off so that the first placement cylinder 1 and the second placement cylinder 2 rotate a full number of revolutions and then stop. Then the drive source 5 is turned on to move the clamping ring 4 to release the clamp on the steel pipe, so that the welded steel pipe can be taken out. In this way, when performing multi-layer, multi-pass welding on the steel pipe end, the weld seam can be cleaned up in time after each layer to remove welding slag and spatter, avoid the accumulation of defects, and thus ensure the purity of each layer of weld seam, thereby improving the stability of the steel pipe end welding. When the welded steel pipe is welded with other steel pipes, the pipe truss made is more stable.

[0073] like Figures 2-6 As shown, in a preferred embodiment of the present invention, a second mounting bracket 17 is slidably mounted on the positioning ring 3, and a cleaning block 15 is fixed on the second mounting bracket 17. The cleaning block 15 is in contact with the outer surface of the end of the steel pipe located inside the positioning ring 3, and the cleaning block 15 is located between the welding gun module 7 and the grinding disc 13. The second mounting bracket 17 is fixedly connected to the first mounting bracket 10 through the connecting rod 18.

[0074] In one embodiment, a wiping cotton 16 is also fixed on the second mounting bracket 17, and the wiping cotton 16 is located between the welding gun module 7 and the cleaning block 15.

[0075] Among them, the cleaning block 15 is made of sponge, which can be soaked in cleaning liquid.

[0076] In practical application, before the weld seam, after being ground by the grinding disc 13, rotates to the welding gun module 7, it first moves to the cleaning block 15. The cleaning block 15, which moves in a reciprocating linear motion synchronously with the stainless steel brush 9, can remove dust from the ground weld seam to remove debris. Then the weld seam moves to contact the wiping cotton 16, which moves in a reciprocating linear motion synchronously to dry the weld seam so that it can be welded again when it is rotated to the welding gun module 7.

[0077] like Figures 2-8 As shown, in a preferred embodiment of the present invention, the transmission assembly 19 includes:

[0078] The gear ring 1901 is coaxially and fixedly connected to the second placement cylinder 2. The gear ring 1901 meshes with the gear 1902, and the gear 1902 is rotatably mounted on the inner wall of the positioning ring 3.

[0079] The worm 1903 is coaxially and fixedly connected to the gear 1902, and the worm 1903 meshes with the worm wheel 1904, which is rotatably mounted on the inner wall of the positioning ring 3.

[0080] And a half gear 1905, which is coaxially and fixedly connected to the worm gear 1904, and its central axis is arranged perpendicularly to the central axis of the second placement cylinder 2. The half gear 1905 meshes with the rack frame 1906, and the rack frame 1906 is slidably installed on the inner wall of the positioning ring 3. The rack frame 1906 is fixedly connected to the connecting rod 18.

[0081] In one embodiment, the extending direction of the rack frame 1906 is parallel to the axial direction of the second placement cylinder 2, and racks that mesh with the tooth blocks of the half gear 1905 are provided on both inner walls of the rack frame 1906.

[0082] In practical application, when the output source 6 drives the second placement cylinder 2 to rotate, the gear ring 1901 rotates synchronously, which drives the gear 1902 to rotate, i.e., the worm 1903 rotates synchronously, enabling the worm wheel 1904 to rotate, and thus the half gear 1905 rotates synchronously. During the rotation of the half gear 1905, when the half gear 1905 rotates to the point where its tooth block meshes with the rack on one side of the rack frame 1906, the half gear 1905 continues to rotate, driving the rack frame 1906 to translate, until the tooth block of the half gear 1905 rotates away from the rack on this side of the rack frame 1906, and then the half gear 1905... When 905 rotates until its toothed block meshes with the rack on the other side of the rack frame 1906, the half gear 1905 continues to rotate, driving the rack frame 1906 to translate in the same direction until the toothed block of the half gear 1905 rotates away from the rack on this side of the rack frame 1906. By repeating this process, the rack frame 1906 can achieve reciprocating linear motion, thereby achieving reciprocating linear motion of the connecting rod 18, and thus achieving reciprocating linear motion of the first mounting bracket 10 and the second mounting bracket 17. The stainless steel brush 9 and the cleaning block 15 can then perform reciprocating linear motion synchronously along the axial direction of the second placement cylinder 2 to clean the weld.

[0083] like Figures 2-6 As shown, in a preferred embodiment of the present invention, the first cooling element 8 is a cooling plate and is connected to an external cooler. The first cooling element 8 is in contact with the outer surface of the steel pipe on both sides of the weld.

[0084] In one embodiment, the external cooler is connected to the external controller. The cooling chip, the external cooler, and the external controller are all prior art. This application does not improve them. Therefore, it is not necessary to disclose their specific mechanical and circuit structures, and this does not affect the integrity of this application.

[0085] In practical applications, the first cooling element 8 cools the weld to 200°C so that the stainless steel brush 9 can clean the weld.

[0086] like Figures 2-6 As shown, in a preferred embodiment of the present invention, the second cooling element 11 is a heat exchange plate, and it is connected to the coolant tank 12 mounted on the positioning ring 3. The coolant tank 12 is connected to the circulating pump.

[0087] In one embodiment, the heat exchange plate is in contact with the weld and the flowing coolant on both sides, respectively, which can conduct the low temperature of the flowing coolant to the weld of the steel pipe and the area around the weld, thereby achieving cooling. The circulating pump is connected to an external cooler. The heat exchange plate, the circulating pump, and the external controller are all prior art. This application does not improve them. Therefore, it is not necessary to disclose their specific mechanical and circuit structures, and it does not affect the integrity of this application.

[0088] In practical applications, the heat exchange plates cool the weld to room temperature, facilitating subsequent grinding by the grinding disc 13.

[0089] The working principle of this invention: The above embodiments of this invention provide a welding process for manufacturing a tubular truss steel structure. When the steel pipe is rotated by the first placement cylinder 1 and the second placement cylinder 2 for welding, the second placement cylinder 2 drives the stainless steel brush 9 to reciprocate linearly along the axial direction of the second placement cylinder 2 through the transmission component 19. This allows for weld seam cleaning after the first cooling of the weld seam, removing residual welding slag and cleaning the weld seam, while avoiding accelerated metal oxidation at high temperatures. Subsequently, after the weld seam is cooled a second time, it is ground by the rotating grinding disc 13 to achieve deep cleaning and ensure no slag inclusion defects. Then, the weld seam rotates to the welding gun module 7 for the next layer of welding. This allows for timely cleaning of the weld seam after each layer of welding when performing multi-layer, multi-pass welding on the steel pipe end, removing welding slag and spatter, and avoiding defect accumulation. This ensures the purity of each layer of weld seam and improves the stability of the steel pipe end welding. As a result, the tubular truss is more stable when the welded steel pipe is welded to other steel pipes.

[0090] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A process for fabricating and welding a tubular truss steel structure, characterized in that, Includes the following steps: Step S1: Cut the steel pipe to the required length according to the manufacturing requirements, and ensure that the cut is smooth and burr-free; Step S2: Remove the oxide scale from the surface of the steel pipe to be welded and the cut steel pipe; Step S3: Insert the steel pipe to be welded into the through hole of the second placement cylinder (2) and place it on the clamping ring (4) located below; Step S4: Insert the cut steel pipe into the through hole of the first placement cylinder (1) and place it on the clamping ring (4) located below; Step S5: Start the drive source (5) to make the clamping rings (4) on both sides of each steel pipe move towards each other to clamp the steel pipe, and the steel pipe is coaxial with the through hole, and the welding port of the two steel pipes is located inside the positioning ring (3); Step S6: Start the welding gun module (7) so that its welding gun is aligned with the welding ports of the two steel pipes; Step S7: Start the output source (6) to drive the first placement cylinder (1) and the second placement cylinder (2) to rotate synchronously, so that the welding gun module (7) can weld the ends of the two steel pipes to form a weld. Step S8: The weld after welding is transferred to the first cooling component (8) for the first cooling; Step S9: After the first cooling, the weld is rotated to the stainless steel brush (9). At the same time, when the second placement cylinder (2) rotates, the stainless steel brush (9) is driven by the transmission component (19) to reciprocate linearly along the axis of the second placement cylinder (2). This can clean the weld and the surface of the steel pipe around the weld, remove residual welding slag and clean the weld, and avoid the aggravation of metal oxidation at high temperature. Step S10: After being cleaned by the stainless steel brush (9), the weld is rotated to the second cooling part (11) for a second cooling, so that the temperature of the weld is reduced again; Step S11: After the second cooling, the weld is rotated to the grinding disc (13). The power source (14) drives the grinding disc (13) to rotate to grind the weld, achieve deep cleaning, and ensure that there are no slag inclusions. Step S12: The weld seam, after being ground by the grinding disc (13), is rotated to the welding gun module (7) for re-welding; Step S13: Repeat steps S7 to S12 to achieve multi-layer, multi-pass welding of the steel pipe end; Step S14: After welding is completed, turn off the welding gun module (7) and the output source (6) so that the first placement cylinder (1) and the second placement cylinder (2) rotate a full number of times and then stop. Then start the drive source (5) so that the clamping ring (4) moves to release the clamping of the steel pipe so that the welded steel pipe can be taken out.

2. The process for fabricating and welding a tubular truss steel structure according to claim 1, characterized in that, The process is applied to a tubular truss steel structure fabrication and welding equipment, the equipment comprising: The first placement cylinder (1) is rotatably mounted on the equipment base and is symmetrically arranged with the second placement cylinder (2). The second placement cylinder (2) is rotatably mounted on the equipment base. The opposite ends of the first placement cylinder (1) and the second placement cylinder (2) are respectively engaged with the two ends of the positioning ring (3). The positioning ring (3) is fixed on the equipment base and is rotatably engaged with both the first placement cylinder (1) and the second placement cylinder (2). Both the first placement cylinder (1) and the second placement cylinder (2) are provided with through holes along the axial direction. An output source (6) for driving the first placement cylinder (1) and the second placement cylinder (2) to rotate is installed on the equipment base. Clamping ring (4), two symmetrically arranged clamping rings (4) are slidably installed in the first placement cylinder (1) and the second placement cylinder (2), and a driving source (5) for driving the clamping ring (4) to translate is provided on the first placement cylinder (1) and the second placement cylinder (2). The welding torch module (7) is mounted on the positioning ring (3), and its welding torch is aligned with the end of the steel pipe located inside the positioning ring (3); A stainless steel brush (9) is fixed on a first mounting bracket (10), which is slidably mounted on a positioning ring (3). A transmission assembly (19) connected to the first mounting bracket (10) is mounted on the positioning ring (3). A first cooling element (8) is mounted on the positioning ring (3) and is located between the welding gun module (7) and the stainless steel brush (9). When the second placement cylinder (2) rotates, the surface of the steel pipe is welded by the welding gun of the welding gun module (7) and rotates towards the first cooling element (8). The second placement cylinder (2) drives the stainless steel brush (9) to reciprocate linearly along the axial direction of the second placement cylinder (2) through the transmission assembly (19). The grinding disc (13) is rotatably mounted on the positioning ring (3) and driven to rotate by the power source (14) mounted on the positioning ring (3). A second cooling element (11) is mounted on the positioning ring (3), and the second cooling element (11) is located between the stainless steel brush (9) and the grinding disc (13). The grinding disc (13) is located between the welding torch module (7) and the second cooling element (11).

3. The process for fabricating and welding a tubular truss steel structure according to claim 2, characterized in that, A second mounting bracket (17) is slidably mounted on the positioning ring (3), and a cleaning block (15) is fixed on the second mounting bracket (17). The cleaning block (15) is in contact with the outer surface of the end of the steel pipe located inside the positioning ring (3), and the cleaning block (15) is located between the welding gun module (7) and the grinding disc (13). The second mounting bracket (17) is fixedly connected to the first mounting bracket (10) through a connecting rod (18).

4. The process for fabricating and welding a tubular truss steel structure according to claim 3, characterized in that, The second mounting bracket (17) also has a wiping cotton (16) fixed on it, and the wiping cotton (16) is located between the welding gun module (7) and the cleaning block (15).

5. The process for fabricating and welding a tubular truss steel structure according to claim 3, characterized in that, The transmission assembly (19) includes: A gear ring (1901) is coaxially and fixedly connected to the second placement cylinder (2). The gear ring (1901) meshes with a gear (1902), and the gear (1902) is rotatably mounted on the inner wall of the positioning ring (3). A worm (1903) is coaxially and fixedly connected to the gear (1902), and the worm (1903) meshes with a worm wheel (1904), which is rotatably mounted on the inner wall of the positioning ring (3); and A half gear (1905) is coaxially fixedly connected to the worm gear (1904), and its central axis is arranged perpendicularly to the central axis of the second placement cylinder (2). The half gear (1905) meshes with the rack frame (1906), and the rack frame (1906) is slidably installed on the inner wall of the positioning ring (3). The rack frame (1906) is fixedly connected to the connecting rod (18).

6. The process for fabricating and welding a tubular truss steel structure according to claim 2, characterized in that, The first cooling element (8) is a cooling plate and is connected to an external cooler. The first cooling element (8) is attached to the outer surface of the steel pipe on both sides of the weld.

7. The process for fabricating and welding a tubular truss steel structure according to claim 3, characterized in that, The second cooling element (11) is a heat exchange plate and is connected to a coolant tank (12) installed on the positioning ring (3). The coolant tank (12) is connected to a circulating pump.

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