Automatic positioning and welding device for metal furniture pipe

Abstract

The application relates to the technical field of pipe welding equipment, and discloses an automatic positioning and welding device for metal furniture pipes, which comprises a base and a welding gun, the top of the base is provided with a frame body, the top of the frame body is symmetrically provided with air cylinders one, the output ends of the two air cylinders one are fixedly connected with lifting plates, the bottom of each lifting plate is symmetrically provided with a vertical rod, the bottom ends of the two vertical rods are provided with a long plate, the middle of the long plate is provided with a positioning plate, a positioning groove is formed in the positioning plate, and a grinding piece is arranged in the positioning groove of the positioning plate, the two ends of the long plate are symmetrically provided with supporting rods, and the one end of each supporting rod is provided with a sliding rod. Through the sealing cooperation between the pipe opening and the grinding piece, the flatness detection of the port in the grinding process is realized by combining the air pressure ventilation and the determination mechanism of the piston electrode conduction, the detection mode can accurately determine whether the end face of the pipe opening is flat, and problems such as pipe butt edge misalignment, uneven welding seam and virtual welding caused by the misalignment of the pipe opening can be avoided.

Description

Technical Field

[0001] This invention relates to the field of pipe welding equipment technology, specifically to an automatic positioning and welding device for metal furniture pipes. Background Technology

[0002] Metal tubing is the core load-bearing component of metal furniture such as tables, chairs, shelves, and railings. During the production process, two tubing pieces need to be welded together. The flatness, coaxiality, and density of the weld directly determine the overall structural strength and appearance quality of the furniture.

[0003] In the existing technology, two pipes are first clamped and fixed by a clamping mechanism. The pipes are then manually transported to the grinding station, where the grinding disc is driven to rotate and grind the pipe ends. The operator visually observes and judges the flatness of the pipe ends. Once the flatness is confirmed to be acceptable, the clamps are released, and the pipes are transferred to the welding station for re-clamping and positioning. The ends of the two pipes are aligned, and then the equipment is started. The welding torch is lowered and aligned with the pipe butt joint. At the same time, the pipeline outputs protective gas, and the welding torch ignites an arc to complete the circumferential or straight seam welding of the pipes.

[0004] The inventors of this application discovered in their research that the core defect of the aforementioned prior art lies in the lack of an effective end flatness detection mechanism during the end grinding process. Relying on manual visual judgment to determine whether the pipe end face is ground flat easily leads to problems such as uneven pipe end grinding, misaligned edges, and inconsistent gap sizes, which in turn cause defects such as welding porosity, incomplete welding, and incomplete penetration. Furthermore, the grinding station and welding station of traditional equipment are independent of each other. After the pipe is ground, it needs to be loosened and transported, and then clamped and positioned again. This not only makes the process cumbersome and has a low degree of automation, but also easily causes positioning deviations due to repeated clamping, reducing the coaxiality of the pipe joint and affecting the welding quality. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an automatic positioning and welding device for metal furniture tubing. This device solves the problems of traditional welding equipment lacking an automatic detection mechanism for pipe end flatness, relying on manual visual judgment which easily leads to pipe end misalignment and various welding defects; the separation of grinding and welding stations, requiring the tubing to be transported and clamped twice, resulting in cumbersome procedures, poor positioning accuracy, and difficulty in guaranteeing welding quality.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an automatic positioning and welding device for metal furniture tubing, comprising a base and a welding torch. A frame is mounted on the top of the base, and cylinders are symmetrically mounted on the top of the frame. A lifting plate is fixedly connected to the output ends of two cylinders. Vertical rods are symmetrically mounted on the bottom of the lifting plate, and long plates are mounted on the bottom ends of the two vertical rods. A positioning plate is mounted in the middle of the long plate, and a positioning groove is formed within the positioning plate. A grinding disc is disposed within the positioning groove of the positioning plate. Support rods are symmetrically mounted at both ends of the long plate, and a sliding rod is disposed at one end of each support rod. The outer wall of the sliding rod is slidably connected to the outer wall of a wedge-shaped block. A detection component is disposed on one side of the base. The detection component includes a sleeve, a piston is disposed within the sleeve, an electrode plate is mounted on one side of the piston, an electrode plate is mounted on the inner wall of the sleeve, and an indicator light is mounted on the outer wall of the sleeve. A pushing component and a clamping component are respectively disposed on the top of the base.

[0007] By adopting the above technical solution, and utilizing the sealed fit between the pipe opening and the grinding disc, combined with the judgment mechanism of air pressure supply and piston electrode conduction, the flatness detection of the end during the grinding process is realized. When the equipment is working, the air pump continuously delivers stable protective gas to the air inlet pipe. When the pipe end is not ground flat, a gap will form between the pipe opening and the contact surface of the grinding disc, and the gas will overflow from the gap, failing to trigger the operation of cylinder one. Only when the end is ground completely flat and fits the grinding disc without gaps can the gas smoothly enter the sleeve inside the detection component, triggering electrode conduction and transmitting flatness. The qualified signal indicates that this detection method can accurately determine whether the pipe end face is flat, and the judgment result is accurate and reliable. It avoids problems such as misalignment of pipe joints, uneven welds, and incomplete welding caused by uneven pipe ends, thereby improving the forming quality of pipe butt welding and reducing the product welding defect rate. It adopts a single power source linkage control of cylinder to control the coordinated operation of welding and grinding mechanisms. The entire mechanism is only driven to move down after the pipe end is ground flat and passes the inspection, so as to realize the simultaneous completion of multiple processes such as grinding mechanism avoidance, precise alignment of pipe ends, and precise positioning of welding torch head.

[0008] Preferably, it also includes a detection hole. The detection hole is provided inside the positioning plate and is located below the grinding disc. An air intake pipe is fixedly connected to the bottom of the grinding disc. A detection tube is fixedly connected to one side of the air intake pipe. The end of the detection tube away from the air intake pipe is connected to the sleeve. Electrode plate one and electrode plate two are electrically connected to the indicator light. The indicator light is electrically connected to cylinder one. A spring one is fixedly connected between the piston and the inner wall of the end of the sleeve.

[0009] Preferably, the bottom of the lifting plate is symmetrically fixedly connected with guide rods, and the outer walls of the two guide rods are slidably connected with mounting plates. The welding gun is installed at the bottom middle position of the mounting plate. The mounting plate and the lifting plate are symmetrically fixedly connected with springs two, which are sleeved on the outer walls of the guide rods. The grinding disc has symmetrically opened chip discharge ports inside. The bottom end of the welding gun is provided with a flow guide shroud, which is located directly above the positioning plate.

[0010] Preferably, the pushing assembly includes limiting rods. Limiting rods are symmetrically fixedly connected to both ends of the top of the base. A movable plate is slidably connected to the outer wall of the two limiting rods at the same end. A spring is symmetrically fixedly connected between the movable plate and the side wall of the base. The spring is sleeved on the outer wall of the limiting rod. A groove is formed on the top of the movable plate. A sliding plate is slidably connected in the groove of the movable plate. An electric push rod is installed on the inner wall of one side of the groove of the movable plate. The output end of the electric push rod is fixedly connected to one side of the sliding plate. Wedge blocks are symmetrically installed on the top of the movable plate.

[0011] Preferably, the clamping assembly includes two slide rails, the bottoms of which are symmetrically fixedly connected to the top of the slide plate. The outer walls of the two slide rails are slidably connected to a fixing ring, the inner walls of which are rotatably connected to a rotating ring. A plug rod is uniformly fixedly connected to one side of the rotating ring. The tops of the two slide plates are symmetrically fixedly connected to a vertical plate, and a fixing seat is symmetrically installed on one side of the vertical plate.

[0012] Preferably, a rotating shaft is rotatably connected inside the fixed base, and a roller is fixedly connected to the outer wall of the rotating shaft. The roller is disposed inside the fixed base, and a motor is installed on one side of one of the fixed bases. The output end of the motor is fixedly connected to one end of one of the rotating shafts.

[0013] Preferably, the clamping assembly further includes two mounting rings, with limiting rings symmetrically fixedly connected to the outer walls of the mounting rings, and the rollers disposed within the two limiting rings. Rod holes are evenly provided on the outer walls of the mounting rings, and movable rods are slidably connected within the rod holes of the mounting rings.

[0014] Preferably, one end of the movable rod is fixedly connected to a mounting base, and a clamping wheel is rotatably connected inside the mounting base. The other end of the movable rod is fixedly connected to a rod cap, and a spring four is fixedly connected between the rod cap and the outer wall of the mounting ring. The spring four is sleeved on the outer wall of the movable rod.

[0015] Preferably, the movable rod has a slot in the middle, the mounting ring has evenly spaced rod grooves, and the insertion rod is slidably connected in the rod groove.

[0016] Preferably, a fixing block is installed on the top of the slide plate, and a second cylinder is installed on one side of the fixing block. The output end of the second cylinder is fixedly connected to the bottom of one side of the fixing ring.

[0017] This invention provides an automatic positioning and welding device for metal furniture tubing. It has the following advantages:

[0018] 1. This invention utilizes the sealed fit between the pipe end and the grinding disc, combined with a judgment mechanism based on air pressure and piston electrode conduction, to detect the flatness of the end during the grinding process. When the pipe end is not flat, gas overflows from the gap and cannot trigger the operation of the cylinder. Only when the end is completely flat and fits the grinding disc without gaps can the gas smoothly enter the sleeve inside the detection component, triggering the electrode conduction and transmitting a flatness qualification signal. This detection method can accurately determine whether the pipe end face is flat, avoiding problems such as misaligned pipe butt joints, uneven welds, and incomplete welds caused by uneven pipe ends, thus improving the forming quality of pipe butt welding.

[0019] 2. This invention employs a single cylinder to drive the welding and grinding mechanisms in a coordinated manner. The entire mechanism is only driven to move downwards after the pipe end has been ground smooth and passed inspection. This allows for the simultaneous completion of multiple processes, including grinding mechanism avoidance, precise alignment of pipe ends, and precise positioning of the welding torch. Compared to traditional equipment where grinding, positioning, and welding are separate processes requiring multiple clamping and transfer of pipes, this equipment achieves one-time clamping and integral forming throughout the entire process. It eliminates the need for secondary positioning and tooling adjustments, avoiding coaxiality deviations and positioning offsets caused by multiple clamping. This effectively ensures the coaxiality and joint fit accuracy of the two pipes, improving the consistency and pass rate of the welded pipe products.

[0020] 3. This invention utilizes the original positioning groove of the pipe in conjunction with a flow guide to form a local protection area. After the protective gas is output from the detection hole, it is concentrated in the welding area of ​​the weld under the limiting and guiding effect of the flow guide. There is no need to fill the entire cavity of the pipe with gas for protection. Compared with the traditional whole pipe argon filling protection process, it reduces the consumption of protective gas and lowers the production material cost. At the same time, it can quickly expel the air in the welding area, continuously isolate impurities such as oxygen and water vapor, effectively avoid defects such as oxidation, blackening, and porosity of the weld, improve the density and welding strength of the weld, and ensure the aesthetics and structural stability of the weld of the metal furniture pipe. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0022] Figure 2 This is a three-dimensional cross-sectional view of the frame structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the overall cross-sectional three-dimensional structure of the present invention;

[0024] Figure 4 This is a partial three-dimensional structural diagram of the present invention;

[0025] Figure 5 This is a cross-sectional perspective view of the base and frame structure of the present invention;

[0026] Figure 6 This is a schematic diagram of the detection component structure of the present invention;

[0027] Figure 7 for Figure 2 A magnified structural diagram at point A;

[0028] Figure 8 This is a schematic diagram of the clamping component structure of the present invention;

[0029] Figure 9 This is a partial structural diagram of the clamping assembly of the present invention;

[0030] Figure 10 This is a cross-sectional view of the clamping assembly of the present invention;

[0031] Figure 11 This is a partial structural diagram of the movable plate of the present invention;

[0032] Figure 12 This is a partial structural diagram of the mounting ring of the present invention.

[0033] The components include: 1. Base; 101. Frame; 2. Cylinder 1; 201. Lifting plate; 202. Guide rod; 203. Mounting plate; 204. Spring 2; 205. Welding torch; 206. Draft shield; 3. Vertical rod; 301. Long plate; 302. Positioning plate; 303. Grinding disc; 304. Support rod; 305. Slide rod; 306. Wedge block; 307. Chip discharge port; 4. Sleeve; 401. Piston; 402. Electrode 1; 403. Electrode 2; 404. Indicator light; 405. Detection tube; 406. Intake pipe; 407. Inspection... Measuring hole; 408, Spring 1; 5, Limiting rod; 501, Moving plate; 502, Spring 3; 503, Groove; 504, Slide plate; 505, Electric push rod; 6, Vertical plate; 601, Fixed base; 602, Roller; 603, Motor; 604, Limiting ring; 605, Mounting ring; 606, Moving rod; 607, Mounting base; 608, Pressing wheel; 609, Spring 4; 610, Slot; 612, Fixed ring; 613, Rotating ring; 614, Insert rod; 615, Fixed block; 616, Cylinder 2; 617, Slide rail. Detailed Implementation

[0034] The technical solution of the present invention will now be clearly and completely described 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.

[0035] Please see the appendix Figure 1 - Appendix Figure 12 This invention provides an automatic positioning and welding device for metal furniture tubing, including a base 1 and a welding torch 205. A frame 101 is mounted on the top of the base 1, and cylinders 2 are symmetrically mounted on the top of the frame 101. The output ends of the two cylinders 2 are fixedly connected to lifting plates 201. Vertical rods 3 are symmetrically mounted on the bottom of the lifting plates 201, and long plates 301 are mounted on the bottom ends of the two vertical rods 3. A positioning plate 302 is mounted in the middle of the long plate 301, and a positioning groove is formed in the positioning plate 302. A grinding disc 303 is set in the positioning groove of the positioning plate 302. Support rods 304 are symmetrically mounted on both ends of the long plate 301, and a sliding rod 305 is set at one end of the support rod 304. The outer wall of the sliding rod 305 is slidably connected to the outer wall of the wedge block 306. A detection component is set on one side of the base 1. The detection component includes a sleeve 4, and a piston is set inside the sleeve 4. 401. An electrode plate 402 is installed on one side of the piston 401. An electrode plate 403 is installed on the inner wall of the sleeve 4. An indicator light 404 is installed on the outer wall of the sleeve 4. It also includes a detection hole 407. The detection hole 407 is opened inside the positioning plate 302. The detection hole 407 of the positioning plate 302 is located below the grinding disc 303. An air intake pipe 406 is fixedly connected to the bottom of the grinding disc 303. A detection tube 405 is fixedly connected to one side of the air intake pipe 406. The end of the detection tube 405 away from the air intake pipe 406 is connected to the sleeve 4. The electrode plate 402 and the electrode plate 403 are electrically connected to the indicator light 404. The indicator light 404 is electrically connected to the cylinder 2. A spring 408 is fixedly connected between the piston 401 and the inner wall of the sleeve 4. A pushing assembly and a clamping assembly are respectively provided on the top of the base 1.

[0036] Specifically, after the two pipes to be welded are clamped and fixed, the motor 603 is started to drive one of the rollers 602 to rotate. The roller 602 is set between the two limiting rings 604 on the outer wall of the mounting ring 605. It drives the mounting ring 605 and the rotating ring 613 to rotate by friction, so that the clamped and fixed pipes rotate synchronously. During the rotation of the pipes, the pipe ends continuously rub and cut with the grinding disc 303 to achieve grinding and flattening of the pipe ends.

[0037] An external air pump is pre-connected to the air intake pipe 406, providing continuous air supply throughout the grinding process. The airflow is delivered along the air intake pipe 406 to the detection hole 407 at the bottom of the grinding disc 303 and flows upwards. Initially, when the pipe end is uneven, gaps exist between the pipe opening and the contact surface of the grinding disc 303, allowing gas to escape. Once the pipe end is completely smoothed, the pipe opening is tightly pressed against the grinding disc 303, eliminating any gaps and preventing airflow. The gas then flows along the detection pipe 405 into the sleeve 4. The gas entering the sleeve 4 pushes the piston 401, compressing the spring 408. The piston 401 then moves the electrode plate 402. When the tube end face is in contact with electrode plate 403, indicator light 404 is powered on and illuminates, the circuit is turned on and transmits the flatness and qualification signal to the control system. After receiving the tube end flatness and qualification signal, the control system automatically starts the two cylinders 2 at the top of the frame 101. Only when the end face is ground completely flat and fits the grinding plate 303 without gaps can the gas be smoothly introduced into the sleeve 4 of the detection component, triggering the electrode to turn on and transmit the flatness and qualification signal. This detection method can accurately determine whether the end face of the tube is flat, avoid problems such as misalignment of the tube butt joint, uneven weld, and poor welding caused by uneven tube ends, and improve the forming quality of tube butt welding.

[0038] After cylinder 2 is started, it drives the lifting plate 201 to move down. The lifting plate 201 drives the welding gun 205 and the vertical rods 3 on both sides to move down synchronously. The vertical rods 3 on both sides push the long plate 301 to move down. The long plate 301 drives the positioning plate 302, the grinding disc 303 and the support rods 304 at both ends to move down synchronously. The sliding rod 305 at the end of the support rod 304 moves down along the wedge block 306, so that the grinding disc 303 moves down and separates from the joint end face of the two pipes. After the grinding disc 303 moves down and separates completely, the two smooth pipe end faces automatically fit tightly and align. At this time, the gun head of the welding gun 205 is set at the joint of the two pipe openings. The welding gun 205 is started to weld the joint of the two pipes.

[0039] The welding and grinding mechanisms are coordinated by using a single power source of cylinder 1-2. The entire mechanism is only driven to move down after the pipe end is ground flat and passes inspection. This allows for the simultaneous completion of multiple processes, including the grinding mechanism avoiding obstacles, the pipe end being precisely aligned, and the welding torch 205 head being precisely positioned.

[0040] By setting up a pushing component for lateral feeding of the pipe, it is ensured that the end face of the pipe is always in contact with the grinding disc 303 during the grinding process; by setting up a clamping component for clamping, fixing and rotating the pipe.

[0041] Please see the appendix Figure 1 - Appendix Figure 5The bottom of the lifting plate 201 is symmetrically fixedly connected with guide rods 202. The outer walls of the two guide rods 202 are slidably connected with mounting plates 203. The welding gun 205 is installed at the bottom middle position of the mounting plate 203. The mounting plate 203 and the lifting plate 201 are symmetrically fixedly connected with springs 204. Springs 204 are sleeved on the outer wall of the guide rods 202. The grinding disc 303 has symmetrical chip discharge ports 307 inside. The bottom end of the welding gun 205 is provided with a flow guide 206, which is located directly above the positioning plate 302.

[0042] Specifically, when the cylinder 2 moves the lifting plate 201 downward, the guide rod 202 moves downward synchronously with the lifting plate 201. The spring 204 sleeved on the outside of the guide rod 202 can provide elastic buffering and limiting for the mounting plate 203 and the welding torch 205. When the welding torch 205 contacts the surface of the pipe during its downward movement, the spring 204 can be compressed and compressed to buffer the impact, preventing the welding torch 205 from hitting the pipe hard and causing deformation of the pipe or damage to the welding torch 205 head. At the same time, it ensures that the welding torch 205 head and the weld are in stable contact.

[0043] When the two polished pipe ends automatically fit together tightly, the nozzle of the welding torch 205 is aimed at the joint of the two pipe ends. The flow guide 206 is located above the positioning plate 302. The protective gas continuously output by the polishing and testing process flows upward from the detection hole 407 of the positioning plate 302. The rising airflow is gathered and constrained by the flow guide 206 below the welding torch 205, forming a protective gas layer around the pipe butt weld, isolating the air to prevent the weld from oxidizing and producing porosity, and improving the weld density and welding quality.

[0044] The debris generated during grinding will be discharged downward through the chip discharge port 307 inside the grinding disc 303, preventing debris from accumulating at the tube opening and affecting the bonding accuracy.

[0045] Please see the appendix Figure 1 - Appendix Figure 5 Appendix Figure 8 - Appendix Figure 9 The pushing component includes a limiting rod 5. The two ends of the top of the base 1 are symmetrically fixedly connected to the limiting rod 5. The outer walls of the two limiting rods 5 at the same end are slidably connected to a moving plate 501. The moving plate 501 and the side wall of the base 1 are symmetrically fixedly connected to a spring 502. The spring 502 is sleeved on the outer wall of the limiting rod 5. The top of the moving plate 501 has a groove 503. The sliding plate 504 is slidably connected in the groove 503 of the moving plate 501. An electric push rod 505 is installed on one side of the inner wall of the groove 503 of the moving plate 501. The output end of the electric push rod 505 is fixedly connected to one side of the sliding plate 504. The top of the moving plate 501 is symmetrically installed with wedge blocks 306.

[0046] Specifically, the electric push rod 505 is activated, which pushes the slide plate 504 to move within the groove 503. The slide plate 504 drives the entire clamping assembly to move synchronously, thereby achieving lateral feeding of the pipe during the pipe end grinding process.

[0047] During the pipe end grinding process, by controlling the extension and retraction stroke of the electric push rod 505, the lateral feed amount of the pipes on both sides can be flexibly adjusted, and the contact distance and pressing degree between the ends of the two pipes to be welded and the middle grinding disc 303 can be precisely adjusted to ensure that the pipe end face and the grinding disc 303 are fully in contact, thereby improving the grinding quality.

[0048] The limiting rods 5 symmetrically arranged at both ends of the base 1 realize the lateral limiting and guiding of the moving plate 501. The limiting rods 5 can effectively limit the offset and sway of the moving plate 501 and ensure the stability of the overall structure operation. The spring 3 502 sleeved on the outside of the limiting rod 5 normally forms an elastic support and reset force on the moving plate 501.

[0049] Please see the appendix Figure 1 - Appendix Figure 3 Appendix Figure 8 - Appendix Figure 12 The clamping assembly includes two slide rails 617, the bottoms of which are symmetrically fixed to the top of the slide plate 504. A fixing ring 612 is slidably connected to the outer wall of each slide rail 617, and a rotating ring 613 is rotatably connected to the inner wall of the fixing ring 612. Insert rods 614 are evenly fixedly connected to one side of the rotating ring 613. A vertical plate 6 is symmetrically fixedly connected to the top of each of the two slide plates 504. A fixing seat 601 is symmetrically mounted on one side of each vertical plate 6. A rotating shaft is rotatably connected inside the fixing seat 601, and a roller 602 is fixedly connected to the outer wall of the rotating shaft. The roller 602 is disposed within the fixing seat 601. A motor 603 is mounted on one side of one of the fixing seats 601. The output end of 3 is fixedly connected to one end of one of the rotating shafts. The clamping assembly also includes two mounting rings 605. Limiting rings 604 are symmetrically fixedly connected to the outer wall of the mounting rings 605. Rollers 602 are set in the two limiting rings 604. Rod holes are evenly opened on the outer wall of the mounting rings 605. A movable rod 606 is slidably connected in the rod holes of the mounting rings 605. A mounting base 607 is fixedly connected to one end of the movable rod 606. A pressing wheel 608 is rotatably connected in the mounting base 607. A rod cap is fixedly connected to the other end of the movable rod 606. A spring 609 is fixedly connected between the rod cap and the outer wall of the mounting ring 605. The spring 609 is sleeved on the outer wall of the movable rod 606.

[0050] Specifically, the two pipes to be welded are passed through the center of multiple clamping rollers 608 of the clamping components on the left and right sides, and the pipes are continuously pushed so that the opposite ends of the two pipes are inserted into the positioning groove of the positioning plate 302. The ends of the two pipes contact the two side walls of the grinding disc 303. With the cooperation of the movable rod 606 and the fourth spring 609, the multiple clamping rollers 608 clamp and fix the pipes. Then, the second cylinder 616 is activated to drive the fixing ring 612 to move along the slide rail 617, which in turn causes the rotating ring 613 and the insertion rod 614 to move. The insertion rod 614 is inserted into the slot 610 on the movable rod 606 to fix the movable rod 606 and eliminate the compression allowance of the fourth spring 609. This makes the clamping rollers 608 firmly abut against the outer wall of the pipe, making the pipe clamping and fixing more stable and improving the stability of the pipe clamping and fixing. This avoids the phenomenon of the pipe loosening or moving during grinding and welding.

[0051] After the pipe is clamped and fixed, the motor 603 is started to drive one of the rollers 602 to rotate, which in turn drives the mounting ring 605 and the rotating ring 613 to rotate, so that the clamped and fixed pipe rotates synchronously, which facilitates the subsequent rotation and grinding of the pipe end.

[0052] Please see the appendix Figure 9 Appendix Figure 10 Appendix Figure 12 The movable rod 606 has a slot 610 in the middle, and the mounting ring 605 has evenly spaced rod slots. The insertion rod 614 is slidably connected in the rod slot. The top of the sliding plate 504 is equipped with a fixing block 615, and a cylinder 616 is installed on one side of the fixing block 615. The output end of the cylinder 616 is fixedly connected to the bottom of one side of the fixing ring 612.

[0053] Specifically, after the pipe is fixed by the clamping wheel 608, the cylinder 616 operates to move the fixing ring 612, which drives the rotating ring 613 and the insertion rod 614. The insertion rod 614 is inserted into the slot 610 on the movable rod 606, making the pipe clamping and fixing more stable and improving the stability of the pipe clamping and fixing.

[0054] Workflow: The two pipes to be welded are passed through the center of the multiple clamping rollers 608 of the clamping components on the left and right sides, respectively. The pipes are continuously pushed so that the opposite ends of the two pipes are inserted into the positioning groove of the positioning plate 302. The ends of the two pipes contact the two side walls of the grinding disc 303 respectively. With the cooperation of the movable rod 606 and the four springs 609, the multiple clamping rollers 608 clamp and fix the pipes.

[0055] Next, cylinder 616 is activated, driving the fixed ring 612 to move along the slide rail 617, which in turn causes the rotating ring 613 and the insertion rod 614 to move. The insertion rod 614 is inserted into the slot 610 on the movable rod 606, making the pipe clamped and fixed more securely.

[0056] After the two pipes to be welded are clamped and fixed, the motor 603 is started to drive one of the rollers 602 to rotate. The roller 602 is set between the two limiting rings 604 on the outer wall of the mounting ring 605. It drives the mounting ring 605 and the rotating ring 613 to rotate by friction, so that the clamped and fixed pipes rotate synchronously. During the rotation of the pipes, the pipe ends continuously rub and cut with the grinding disc 303 to complete the grinding and leveling of the pipe ends. The chips generated by grinding will be discharged downward through the chip discharge port 307 opened inside the grinding disc 303.

[0057] An external air pump is pre-connected to the air intake pipe 406. The air pump continuously supplies air throughout the grinding process. The airflow is delivered along the air intake pipe 406 to the detection hole 407 at the bottom of the grinding disc 303 and flows out upward. When the pipe end is uneven in the early stage of grinding, there is a gap between the pipe end and the contact surface of the grinding disc 303. The gas will overflow from the gap. When the pipe end is completely ground flat, the pipe end is tightly attached to the grinding disc 303 with no gap between them. The airflow cannot overflow outward and the gas will flow into the sleeve 4 along the detection pipe 405. The gas entering the sleeve 4 pushes the piston 401 to move, the spring 408 is compressed, the piston 401 drives the electrode 402 to move to contact the electrode 403, the indicator light 404 is powered on and brightens, the circuit is connected and the flat and qualified signal is transmitted to the control system. After receiving the flat and qualified signal of the pipe end, the control system automatically starts the two cylinders 2 at the top of the frame 101.

[0058] The output end of cylinder 2 drives the lifting plate 201 to move down. The lifting plate 201 drives the welding gun 205 and the vertical rods 3 on both sides to move down synchronously. The vertical rods 3 on both sides push the long plate 301 to move down. The long plate 301 drives the positioning plate 302, the grinding disc 303 and the support rods 304 at both ends to move down synchronously. The sliding rod 305 at the end of the support rod 304 moves down along the wedge block 306, so that the grinding disc 303 moves down and separates from the joint end face of the two pipes. After the grinding disc 303 moves down and separates completely, the two smooth pipe end faces automatically fit tightly and align. After alignment, the gun head of the welding gun 205 is set at the joint of the two pipe openings. The welding gun 205 is started to weld the joint of the two pipes.

[0059] Meanwhile, the flow guide 206 is located above the positioning plate 302. The protective gas continuously output during grinding and testing flows upward from the detection hole 407 of the positioning plate 302. The rising airflow is gathered and constrained by the flow guide 206 below the welding torch 205, forming a protective gas layer around the butt weld of the pipe, isolating the air to prevent the weld from oxidizing and producing porosity, thus ensuring the welding quality.

[0060] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic positioning and welding device for metal furniture tubing, comprising a base (1) and a welding torch (205), characterized in that: A frame (101) is installed on the top of the base (1). Cylinders (2) are symmetrically installed on the top of the frame (101). Lifting plates (201) are fixedly connected to the output ends of the two cylinders (2). Vertical rods (3) are symmetrically installed at the bottom of the lifting plates (201). Long plates (301) are installed at the bottom ends of the two vertical rods (3). A positioning plate (302) is installed in the middle of the long plate (301). A positioning groove is opened in the positioning plate (302). A grinding disc (303) is set in the positioning groove of the positioning plate (302). The two ends of the long plate (301) are symmetrically installed There is a support rod (304), and a slide rod (305) is provided at one end of the support rod (304). The outer wall of the slide rod (305) is slidably connected to the outer wall of the wedge block (306). A detection component is provided on one side of the base (1). The detection component includes a sleeve (4). A piston (401) is provided inside the sleeve (4). An electrode plate one (402) is installed on one side of the piston (401). An electrode plate two (403) is installed on the inner wall of the sleeve (4). An indicator light (404) is installed on the outer wall of the sleeve (4). A pushing component and a clamping component are respectively provided on the top of the base (1).

2. The automatic positioning and welding device for metal furniture tubing according to claim 1, characterized in that: It also includes a detection hole (407). The detection hole (407) is provided inside the positioning plate (302). The detection hole (407) of the positioning plate (302) is located below the grinding disc (303). An air intake pipe (406) is fixedly connected to the bottom of the grinding disc (303). A detection tube (405) is fixedly connected to one side of the air intake pipe (406). The end of the detection tube (405) away from the air intake pipe (406) is connected to the sleeve (4). The first electrode plate (402) and the second electrode plate (403) are electrically connected to the indicator light (404). The indicator light (404) is electrically connected to the first cylinder (2). A spring (408) is fixedly connected between the piston (401) and the inner wall of the end of the sleeve (4).

3. The automatic positioning and welding device for metal furniture tubing according to claim 1, characterized in that: The bottom of the lifting plate (201) is symmetrically fixedly connected with guide rods (202), and the outer walls of the two guide rods (202) are slidably connected with mounting plates (203). The welding gun (205) is installed at the bottom middle position of the mounting plate (203). The mounting plate (203) and the lifting plate (201) are symmetrically fixedly connected with springs (204) on opposite sides. Springs (204) are sleeved on the outer wall of the guide rods (202). The grinding disc (303) has symmetrically opened chip discharge ports (307) inside. The bottom end of the welding gun (205) is provided with a flow guide (206), which is located directly above the positioning plate (302).

4. The automatic positioning and welding device for metal furniture tubing according to claim 1, characterized in that: The pushing assembly includes a limiting rod (5). The two ends of the top of the base (1) are symmetrically fixedly connected to the limiting rod (5). The outer walls of the two limiting rods (5) at the same end are slidably connected to a moving plate (501). A spring three (502) is symmetrically fixedly connected between the moving plate (501) and the side wall of the base (1). The spring three (502) is sleeved on the outer wall of the limiting rod (5). The top of the moving plate (501) is provided with a groove (503). A sliding plate (504) is slidably connected in the groove (503) of the moving plate (501). An electric push rod (505) is installed on one side of the inner wall of the groove (503) of the moving plate (501). The output end of the electric push rod (505) is fixedly connected to one side of the sliding plate (504). A wedge block (306) is symmetrically installed on the top of the moving plate (501).

5. The automatic positioning and welding device for metal furniture tubing according to claim 1, characterized in that: The clamping assembly includes two slide rails (617), the bottoms of which are symmetrically fixed to the top of the slide plate (504). The outer walls of the two slide rails (617) are slidably connected to a fixing ring (612), and the inner walls of the fixing ring (612) are rotatably connected to a rotating ring (613). A plug rod (614) is uniformly fixed to one side of the rotating ring (613). The tops of the two slide plates (504) are symmetrically fixed to a vertical plate (6), and a fixing seat (601) is symmetrically installed on one side of the vertical plate (6).

6. The automatic positioning and welding device for metal furniture tubing according to claim 5, characterized in that: A rotating shaft is rotatably connected inside the fixed base (601), and a roller (602) is fixedly connected to the outer wall of the rotating shaft. The roller (602) is disposed inside the fixed base (601). A motor (603) is installed on one side of one of the fixed bases (601), and the output end of the motor (603) is fixedly connected to one end of one of the rotating shafts.

7. The automatic positioning and welding device for metal furniture tubing according to claim 6, characterized in that: The clamping assembly also includes two mounting rings (605), with limiting rings (604) symmetrically fixed to the outer walls of the mounting rings (605). The rollers (602) are disposed within the two limiting rings (604). Rod holes are evenly provided on the outer walls of the mounting rings (605), and movable rods (606) are slidably connected within the rod holes of the mounting rings (605).

8. The automatic positioning and welding device for metal furniture tubing according to claim 7, characterized in that: One end of the movable rod (606) is fixedly connected to a mounting base (607), and a clamping wheel (608) is rotatably connected inside the mounting base (607). The other end of the movable rod (606) is fixedly connected to a rod cap, and a spring four (609) is fixedly connected between the rod cap and the outer wall of the mounting ring (605). The spring four (609) is sleeved on the outer wall of the movable rod (606).

9. The automatic positioning and welding device for metal furniture tubing according to claim 7, characterized in that: The movable rod (606) has a slot (610) in the middle, and the mounting ring (605) has evenly spaced rod grooves. The insertion rod (614) is slidably connected in the rod groove.

10. An automatic positioning and welding device for metal furniture tubing according to claim 5, characterized in that: A fixing block (615) is installed on the top of the slide plate (504), and a cylinder two (616) is installed on one side of the fixing block (615). The output end of the cylinder two (616) is fixedly connected to the bottom of one side of the fixing ring (612).

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