An automatic welding robot for automobile parts

Abstract

The present invention relates to the technical field of welding robots, and specifically discloses an automatic welding robot for automobile parts, comprising a frame and a workbench fixedly installed on the top of the frame and used for placing double-row tail pipes, a gantry fixedly installed on the top of the workbench, a triangular centering clamping unit and a downward pressing double locking unit arranged between the left and right inner walls of the gantry, the present application can provide stronger clamping stability for the double-row tail pipes by forming a stable triangular clamping structure between the clamping points, ensure that the Y-shaped pipe and the tail pipe remain fixed during the entire welding process, even if affected by external forces, the triangular structure can effectively disperse stress and prevent any single clamping point from being subjected to excessive pressure, and because the three clamping points are distributed in different directions, the external force attempting to rotate the Y-shaped pipe or the tail pipe will be offset by the triangular clamping structure, so the Y-shaped pipe and the tail pipe can also be effectively prevented from rotating during the welding process, ensuring accurate centering during welding.

Description

Technical Field

[0001] The invention relates to the technical field of welding robots, and more specifically, to an automatic welding robot for automobile parts. Background Art

[0002] The tailpipe, also known as the exhaust tail pipe or muffler outlet, is part of the car's exhaust system. It is located at the very end of the car and is responsible for discharging the exhaust gas after the engine combustion out of the car. The straight double-row tailpipe refers to the two tail pipes in the exhaust system installed in parallel at the end of the same exhaust pipe, usually located on both sides or in the center of the vehicle's rear bumper. This design not only provides a symmetrical aesthetic, but also effectively guides the exhaust gas out, reduces back pressure, and helps improve engine performance and fuel efficiency.

[0003] Welding is a key step in the production process of double-row tail pipes. During the specific operation, the current welding robot first fixes the two tail pipes side by side on the top of the welding platform through a clamp, and then uses a mechanical arm to place the Y-shaped tube upside down on the two tail pipes, ensuring that the single open end of the Y-shaped tube faces upward, and the two branches are respectively located above the two tail pipes, and then the upper pressure plate is driven by a cylinder or a hydraulic system to move downward and press the single open end of the Y-shaped tube to ensure that the Y-shaped tube fits tightly with the top plane of the tail pipe, and then the welding operation is performed. However, the current welding robot still has certain defects: 1. Although three fixed points are formed for the clamping points of the two tail pipes and the pressing points of the Y-shaped tube, these three fixed points are independent and do not form an overall rigid structure, which means that each fixed point can only provide support locally, and cannot be evenly distributed in the entire clamping system to resist external forces together. Because there is no direct connection between the three fixed points, when any fixed point is subjected to external force, the relative position between the Y-shaped tube and the tail pipe may be offset, thereby affecting the welding quality.

[0004] 2. Although the positioning accuracy of the robotic arm is high, there is still a certain error range, even for high-precision industrial robots. That is to say, when placing and fixing the Y-shaped tube, the two branches of the Y-shaped tube may not be completely aligned with the center line of the tail tube, which will affect the subsequent welding quality and the appearance of the finished product. Summary of the invention

[0005] The invention provides an automatic welding robot for automobile parts, which solves the technical problems in the prior art that the three fixing points of the welding robot are independent of each other and lack stability when fixing a Y-shaped tube and two tail tubes, and lacks automatic centering and fixing when positioning the Y-shaped tube.

[0006] The present invention provides an automatic welding robot for automobile parts, comprising a frame and a workbench fixedly installed on the top of the frame and used for placing double-row tail throats, a gantry fixedly installed on the top of the workbench, a triangular centering clamping unit and a downward pressing double locking unit are arranged between the left and right inner walls of the gantry, the triangular centering clamping unit comprises two left-right symmetrical clamping assemblies and a synchronization assembly, an adjustable annular welding unit is commonly arranged between the two clamping assemblies, the downward pressing double locking unit comprises a pressing locking assembly and a pulling assembly, and the double-row tail throat is composed of a Y-shaped pipe and two tail pipes connected to the double open ends of the Y-shaped pipe.

[0007] The clamping assembly includes a support plate and three return springs fixedly installed on the side of the support plate away from the inner wall of the gantry, the three return springs are jointly installed with a moving plate on one end away from the support plate, three mounting rods are fixedly installed on the side of the moving plate away from the support plate, a clamping plate is fixedly installed on one end of the mounting rod away from the support plate, the three clamping plates are distributed in a triangular shape and correspond to the single opening end and the two tail pipes of the Y-shaped tube respectively, two front-to-back symmetrical connecting rods are fixedly installed on the side of the clamp corresponding to the single opening end of the Y-shaped tube close to the support plate, and a centering plate corresponding to the double opening ends of the Y-shaped tube is fixedly installed on the bottom end of the connecting rod.

[0008] The left and right clamping assemblies are close to each other and clamp the Y-shaped tube and the two tail pipes at the same time. At the same time, under the action of the centering plate, the two exhaust ports at the double open ends of the Y-shaped tube are respectively aligned with the two tail pipes, and a triangular multi-point clamping fixation is formed between the three clamping plates.

[0009] Furthermore, a driving component is fixedly installed on the left side of the gantry, and the output end of the driving component slides through the left inner wall of the gantry and is fixedly connected to the left support plate, and a plurality of limit rods that slide through the support plate are fixedly installed on the side of the moving plate close to the support plate.

[0010] Furthermore, the adjustable annular welding unit includes a docking assembly and a welding assembly that cooperates with the docking assembly to weld the double-row tail throats, the docking assembly includes a guide groove opened on the left movable plate and a guide plate slidably connected in the guide groove, a short arc rail is fixedly installed on the top of the guide plate, and an electric slider is slidably connected to the top of the short arc rail. Two front-to-back symmetrical fixed plates are fixedly installed on the left side of the movable plate on the right, and a long arc rail is fixedly installed on the top of the fixed plate. The short arc rail and the long arc rail are connected to form an annular slide rail, and the electric slider drives the welding assembly to circle the annular slide rail to achieve circumferential welding of the connection between the Y-shaped tube and the tail pipe.

[0011] Furthermore, the welding assembly includes a mounting sleeve fixedly mounted on the top of the electric slider and a welding gun fixedly mounted in the mounting sleeve, and the tip of the welding gun is aligned with the connection between the Y-shaped tube and the tail tube.

[0012] Furthermore, an ear plate extends from the front side of the movable plate on the left side, an electric push rod is fixedly installed on the front side of the ear plate, and an output end of the electric push rod slides through the ear plate and is fixedly connected to the guide plate.

[0013] Furthermore, the synchronization component includes two slide grooves opened on the top of the workbench and symmetrical on the left and right, and slide rods are fixedly installed on the bottom of the left and right support plates. The two slide rods are respectively slidably connected to the left and right slide grooves and extend to the bottom of the slide grooves. Racks are fixedly installed on the rear side of the left slide rod and the front side of the right slide rod. A gear meshing with the two racks is rotatably installed on the bottom of the workbench, and the two racks are rotationally symmetrically arranged at 180° with the center of the gear as the center. Two L-shaped support plates symmetrical front and back are fixedly installed on the bottom of the workbench, and the two racks are respectively slidably connected to the left and right L-shaped support plates.

[0014] Furthermore, the compression lock assembly includes two return springs 2 fixedly installed on the inner wall of the top of the gantry and symmetrically on the left and right, a return plate is commonly installed at the bottom ends of the two return springs 2, a pressure plate is fixedly installed at the bottom center position of the return plate through a return spring 3, two limit rods 2 are fixedly installed on the top of the return plate and slide through the inner wall of the top of the gantry and are symmetrical on the left and right, the two return springs 2 are respectively sleeved on the outside of the left and right limit rods 2, a limit rod 3 is fixedly installed on the top of the pressure plate and slides through the return plate, and the return spring 3 is sleeved on the outside of the limit rod 3.

[0015] Furthermore, two symmetrical plug blocks are fixedly installed on the bottom of the pressure plate, square grooves are opened on the tops of the two movable plates, and the two plug blocks respectively cooperate with the two square grooves on the left and right sides; plug rods are fixedly installed on the adjacent sides of the two support plates, and circular grooves are opened on the left and right sides of the pressure plate, and the two plug rods respectively cooperate with the two circular grooves on the left and right sides.

[0016] Furthermore, the pulling assembly includes two fixed pulleys respectively fixedly mounted on the left and right inner walls of the gantry, a pull rope is wound around the outside of the fixed pulley, the top ends of the two pull ropes are fixedly connected to the reset plate, and the bottom ends of the two pull ropes are respectively fixedly connected to the left and right support plates.

[0017] Furthermore, the driving component is a cylinder.

[0018] The beneficial effects of the present invention are: 1. The present application forms a stable triangular clamping structure between the clamping points, which can provide stronger clamping stability for the double-row tail throat, ensuring that the Y-shaped tube and the tail pipe remain fixed during the entire welding process. Even if affected by external forces, the triangular structure can effectively disperse the stress and prevent any single clamping point from being subjected to excessive pressure. Moreover, since the three clamping points are distributed in different directions, the external force attempting to rotate the Y-shaped tube or the tail pipe will be offset by the triangular clamping structure, so it can also effectively prevent the Y-shaped tube and the tail pipe from rotating during the welding process, ensuring precise alignment during welding.

[0019] 2. Based on the triangular automatic centering clamping of the double-row tail throat, the present application carries out double locking and limiting reinforcement on the clamping assembly in the horizontal and vertical directions. This locking and limiting mechanism ensures that during the welding process, there will be no shaking of the moving plate due to external vibration, causing the clamping plate and the centering plate to shake the double-row tail throat, thereby further improving the welding stability and welding quality.

[0020] 3. When the centering plates on the left and right sides approach each other, the two branches of the Y-shaped tube will gradually be clamped and pressure will be applied. Since the centering plates move synchronously, they will apply equal and opposite forces to the two branches of the Y-shaped tube, thereby forcing the two branches of the Y-shaped tube to gradually move closer to the center line of the tail tube, and finally achieve precise centering and clamping of the Y-shaped tube and the two tail tubes.

[0021] 4. During the welding process, the present application can quickly complete the circumferential welding of the connection between the Y-shaped tube and the front tail pipe and the rear tail pipe through flexible switching between the short arc rail and the front and rear long arc rails, thereby greatly improving the welding efficiency. The annular slide rail ensures that the movement trajectory of the welding gun is always consistent, making the weld more beautiful and the welding quality higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0023] Figure 2 It is a partial three-dimensional structural schematic diagram of the gantry, the triangular centering clamping unit and the downward pressing double locking unit of the present invention.

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the double-row tail throat, support plate, reset spring 2, reset plate and pull rope part of the present invention.

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the limiting rod 2, the return spring 3, the pressure plate, the fixed slide and the circular groove part of the present invention.

[0026] Figure 5 It is a partial three-dimensional structural schematic diagram of the square groove, the movable plate, the return spring 1, the limit rod 1 and the adjustable annular welding unit of the present invention.

[0027] Figure 6 It is a schematic diagram of the three-dimensional structure of the mounting rod, the clamping plate, the connecting rod and the centering plate of the present invention.

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the support plate, slide rod, L-shaped support plate, gear and rack part of the present invention.

[0029] Figure 8It is a schematic diagram of the three-dimensional structure of the guide plate, the fixing plate, the short arc rail, the long arc rail and the welding gun part of the present invention.

[0030] Fig. 9 It is a schematic diagram of the three-dimensional structure of the double-row tail throat part of the present invention.

[0031] In the figure: 1, frame; 2, workbench; 3, gantry; 4, double-row tail throat; 5, triangular centering clamping unit; 6, downward double locking unit; 7, adjustable annular welding unit; 501, clamping assembly; 502, synchronization assembly; 503, driving component; 5011, support plate; 5012, return spring 1; 5013, moving plate; 5014, mounting rod; 5015, clamping plate; 5016, connecting rod; 5017, centering plate; 5018, limit rod 1; 5021, sliding rod; 5022, sliding groove; 5023, rack; 5024, gear; 5025, L-shaped support plate; 601, pressing lock assembly; 602 , pulling assembly; 6010, limit rod two; 6011, reset spring two; 6012, reset plate; 6013, reset spring three; 6014, pressure plate; 6015, plug block; 6016, square groove; 6017, plug rod; 6018, round groove; 6019, limit rod three; 6021, fixed pulley; 6022, pull rope; 701, docking assembly; 702, welding assembly; 703, electric push rod; 7011, guide groove; 7012, guide plate; 7013, short arc rail; 7014, electric slider; 7015, fixed plate; 7016, long arc rail; 7021, installation sleeve; 7022, welding gun. DETAILED DESCRIPTION

[0032] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is to enable those skilled in the art to better understand and implement the subject matter described herein. The functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the present specification. Various examples may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0033] See also Figure 1 , Figure 2 and Fig. 9In this embodiment, an automatic welding robot for automotive parts is proposed, including a frame 1 and a workbench 2 fixedly installed on the top of the frame 1 and used to place a double-row tail throat 4, a gantry 3 is fixedly installed on the top of the workbench 2, a triangular centering clamping unit 5 and a downward double locking unit 6 are arranged between the left and right inner walls of the gantry 3, the triangular centering clamping unit 5 includes two left-right symmetrical clamping assemblies 501 and a synchronization assembly 502 for controlling the synchronous movement of the left and right clamping assemblies 501, an adjustable annular welding unit 7 is arranged between the two clamping assemblies 501, the downward double locking unit 6 includes a pressing locking assembly 601 and a pulling assembly 602 for pulling the pressing locking assembly 601 to move, and the double-row tail throat 4 is composed of a Y-shaped pipe and two tail pipes connected to the double open ends of the Y-shaped pipe.

[0034] During specific use, before welding, the two tail pipes are placed side by side, one in front of the other, at the top center of the workbench 2, and then the Y-shaped tube is inverted on the top of the two tail pipes, so that the two exhaust ports at the double open ends of the Y-shaped tube are respectively aligned with the air inlets at the top of the two tail pipes to form a double row of tail throats 4.

[0035] See also Figure 1 , Figure 2 , Figure 5 and Figure 6 The clamping assembly 501 includes a support plate 5011 and three return springs 5012 fixedly installed on the side of the support plate 5011 away from the inner wall of the gantry 3, the three return springs 5012 are commonly installed with a moving plate 5013 at one end away from the support plate 5011, three mounting rods 5014 are fixedly installed on the side of the moving plate 5013 away from the support plate 5011, and a clamping plate 5015 is fixedly installed on the end of the mounting rod 5014 away from the support plate 5011. The three clamping plates 5015 are distributed in a triangular shape and correspond to the single open end and the two tail pipes of the Y-shaped tube respectively. The clamping plate 5015 corresponding to the single open end of the Y-shaped tube is fixedly installed with two front-to-back symmetrical connecting rods 5016 close to the side of the support plate 5011, and a centering plate 5017 corresponding to the double open ends of the Y-shaped tube is fixedly installed at the bottom end of the connecting rod 5016.

[0036] See also Figure 1 , Figure 2 and Figure 5 A driving component 503 is fixedly installed on the left side of the gantry 3, and the output end of the driving component 503 slides through the left inner wall of the gantry 3 and is fixedly connected to the left support plate 5011. The movable plate 5013 is fixedly installed with a plurality of limit rods 5018 sliding through the support plate 5011 on the side close to the support plate 5011.

[0037] During specific use, after the Y-shaped tube and the two tail pipes are formed into a double-row tail throat 4, the driving component 503 is controlled to push the support plate 5011 on the left to move to the right, thereby driving the movable plate 5013 on the left to move to the right close to the double-row tail throat 4, thereby driving the three clamping plates 5015 and the two centering plates 5017 on the left to move to the right close to the double-row tail throat 4. At the same time, in the process of the left support plate 5011 moving to the right, the three clamping plates 5015 and the two centering plates 5017 on the right will also be driven by the synchronization component 502 to move to the left close to the double-row tail throat 4, so that the clamping plates 5015 and the centering plates 5017 on the left and right sides are synchronously close.

[0038] When the clamping plates 5015 on the left and right sides below are close to each other, the two opposite clamping plates 5015 will clamp and fix the same tail pipe, and when the two clamping plates 5015 on the top are close to each other, they will clamp and fix the single open end of the Y-shaped pipe. At the same time, because the Y-shaped pipe is inverted on the top of the two tail pipes, the two openings of the double open ends of the Y-shaped pipe may not be completely aligned with the center line of the tail pipe, but there will be a slight offset, and the offset will cause uneven welds during welding and affect the welding quality. Therefore, when the centering plates 5017 on the left and right sides are close to each other, they will gradually clamp the two branches of the Y-shaped pipe and apply pressure. At this time, because the centering plates 5017 move synchronously, they will apply equal and opposite forces to the two branches of the Y-shaped pipe, thereby forcing the two branches of the Y-shaped pipe to gradually move closer to the center line of the tail pipe, and finally achieve alignment of the Y-shaped pipe and The two tail pipes are precisely aligned and clamped, and at this time, a stable triangular structure is formed between the clamping points of the two front clamping plates 5015 at the bottom and the front tail pipe, the clamping points of the two rear clamping plates 5015 at the bottom and the rear tail pipe, and the clamping points of the two upper clamping plates 5015 and the single open end of the Y-shaped pipe. By forming the triangular structure, stronger clamping stability can be provided to ensure that the Y-shaped pipe and the tail pipe remain fixed during the entire welding process. Even if affected by external forces, the triangular structure can effectively disperse the stress to prevent any single clamping point from being subjected to excessive pressure. Moreover, since the three clamping points are distributed in different directions, the external force attempting to rotate the Y-shaped pipe or the tail pipe will be offset by the triangular clamping structure, so the Y-shaped pipe and the tail pipe can be effectively prevented from rotating during the welding process, ensuring precise alignment during welding.

[0039] It should be noted that the clamping force provided by the centering plate 5017 during the clamping process is a supplement to the triangular clamping structure formed between the clamping plates 5015, rather than a replacement, and will not destroy the triangular clamping structure. Specifically: the function of the centering plate 5017 is to ensure that the two branches of the Y-shaped tube are aligned with the center line of the tail tube, while the triangular structure ensures that the Y-shaped tube and the tail tube remain fixed during the entire welding process. The two complement each other and jointly ensure high precision and stability during welding.

[0040] See also Figure 2 and Figure 7 The synchronization component 502 includes two slide grooves 5022 opened on the top of the workbench 2 and symmetrical on the left and right. Slide rods 5021 are fixedly installed on the bottom of the left and right support plates 5011. The two slide rods 5021 are respectively slidably connected to the left and right slide grooves 5022 and extend to the bottom of the slide grooves 5022. Racks 5023 are fixedly installed on the rear side of the left slide rod 5021 and the front side of the right slide rod 5021. A gear 5024 meshing with the two racks 5023 is rotatably installed at the bottom of the workbench 2. The two racks 5023 are rotationally symmetrically arranged at 180° with the center of the gear 5024 as the center. Two L-shaped support plates 5025 symmetrical in front and back are fixedly installed on the bottom of the workbench 2. The two racks 5023 are respectively slidably connected to the left and right L-shaped support plates 5025.

[0041] During specific use, when the support plate 5011 on the left side moves to the right, it will drive the rack 5023 on the rear side to move to the right and drive the rack 5023 on the front side to move to the left through the gear 5024. The front rack 5023 moves to the left, which will drive the support plate 5011 on the right side to move to the left through the slide bar 5021 on the right side, thereby driving the movable plate 5013 on the right side to move to the left and approach the double-row tail throat 4, and then drive the three splints 5015 and two centering plates 5017 on the right side to move to the left and approach the double-row tail throat 4, so that the splints 5015 and centering plates 5017 on the left and right sides approach each other synchronously.

[0042] See also Figure 2 , Figure 3 and Figure 4 The pulling assembly 602 includes two fixed pulleys 6021 respectively fixedly mounted on the left and right inner walls of the gantry 3, a pull rope 6022 is wound around the outer side of the fixed pulley 6021, and the bottom ends of the two pull ropes 6022 are respectively fixedly connected to the left and right support plates 5011.

[0043] See also Figure 2 , Figure 4 , Figure 5 and Figure 6 The pressure lock assembly 601 includes two return springs 2 6011 fixedly installed on the inner wall of the top of the gantry 3 and symmetrically on the left and right. A return plate 6012 is installed together at the bottom ends of the two return springs 2 6011. A pressure plate 6014 is fixedly installed at the bottom center of the return plate 6012 through a return spring 3 6013. Two limit rods 2 6010 that slide through the inner wall of the top of the gantry 3 and are symmetrical on the left and right are fixedly installed on the top of the return plate 6012. The two return springs 2 6011 are respectively sleeved on the outside of the left and right limit rods 2 6010. A limit rod 3 6019 that slides through the return plate 6012 is fixedly installed on the top of the pressure plate 6014. The return spring 3 6013 is sleeved on the outside of the limit rod 3 6019. The top ends of the two pull ropes 6022 are fixedly connected to the return plate 6012.

[0044] See also Figure 4 , Figure 5 and Figure 6 Two symmetrical plug blocks 6015 are fixedly installed at the bottom of the pressure plate 6014, square grooves 6016 are opened on the tops of the two movable plates 5013, and the two plug blocks 6015 are respectively matched with the left and right square grooves 6016, and plug rods 6017 are fixedly installed on the side close to the two support plates 5011, and circular grooves 6018 are opened on the left and right sides of the pressure plate 6014, and the two plug rods 6017 are respectively matched with the left and right circular grooves 6018.

[0045] When in use, while the support plate 5011 moves to make the clamping plate 5015 and the centering plate 5017 approach synchronously to perform triangular automatic centering clamping and fixing of the double-row tail pipe 4, the support plate 5011 will also pull the bottom end of the pull rope 6022. At the same time, the horizontal pulling force of the pull rope 6022 will be converted into a vertical downward pulling force under the action of the fixed pulley 6021, so that the two pull ropes 6022 will synchronously pull the reset plate 6012 downward and stretch the reset spring 2 6011, thereby driving the pressure plate 6014 to move downward. After clamping the Y-shaped tube and the two tail pipes, the driving component 503 continues to drive the two support plates 5011 closer to each other, and the support The continued movement of plate 5011 will squeeze the return spring 5012 (because the clamping plate 5015 and the centering plate 5017 are already pressed against the double-row tail throat 4 at this time, the continued movement of the support plate 5011 cannot continue to drive the moving plate 5013 to move, but will squeeze the return spring 5012) and continue to pull the bottom end of the pull rope 6022, driving the pressure plate 6014 to continue to move downward and press on the top of the single open end of the Y-shaped tube, pressing the Y-shaped tube to the top of the tail pipe, and at the same time, the two plug plates will be inserted into the corresponding square grooves 6016, thereby forming a physical horizontal locking limit for the moving plate 5013, and the moving plate 5013 can no longer move in the horizontal direction.

[0046] Next, the support plate 5011 continues to move, driving the insertion rod 6017 to be inserted into the circular groove 6018, so that the insertion rods 6017 on the left and right sides are respectively inserted into the corresponding circular grooves 6018. After the insertion rods 6017 are inserted into the circular grooves 6018, the pressing plate 6014 can no longer move in the vertical direction, forming a physical vertical locking limit for the pressing plate 6014. In the process of the insertion rods 6017 into the circular grooves 6018, the support plate 5011 will continue to pull the reset plate 6012 downward through the pull rope 6022 and squeeze the reset spring 3 6013 (because the pressing plate 6014 has been pressed against the top of the single open end of the Y-shaped tube at this time). Therefore, the reset plate 6012 continues to move downward and cannot continue to drive the pressure plate 6014 to move downward. Instead, it will squeeze the reset spring 6013), thereby providing sufficient travel for the insertion rod 6017 to insert into the circular groove 6018. At this point, the triangular automatic centering clamping of the double-row tail throat 4 is realized, and the clamping assembly 501 is reinforced with double locking and limiting in the horizontal and vertical directions. This locking and limiting mechanism ensures that during the welding process, the movable plate 5013 will not shake due to external vibration, causing the clamping plate 5015 and the centering plate 5017 to shake together with the double-row tail throat 4, thereby greatly improving the welding stability and welding quality.

[0047] See also Figure 1 , Figure 5 , Figure 6 and Figure 8 The adjustable annular welding unit 7 includes a docking assembly 701 and a welding assembly 702 that cooperates with the docking assembly 701 to weld the double-row tail throat 4. The docking assembly 701 includes a guide groove 7011 opened on the left movable plate 5013 and a guide plate 7012 slidably connected in the guide groove 7011. A short arc rail 7013 is fixedly installed on the top of the guide plate 7012, and an electric slider 7014 is slidably connected to the top of the short arc rail 7013. Two front-to-back symmetrical fixed plates 7015 are fixedly installed on the left side of the movable plate 5013 on the right, and a long arc rail 7016 is fixedly installed on the top of the fixed plate 7015. The short arc rail 7013 and the long arc rail 7016 are connected to form an annular slide rail. The electric slider 7014 drives the welding assembly 702 to go around the annular slide rail for one circle to realize the circumferential welding of the connection between the Y-shaped pipe and the tail pipe.

[0048] It should be noted that the short arc rail 7013 and the long arc rail 7016 are both located above the tail pipe.

[0049] See also Figure 1 , Figure 5 , Figure 6 and Figure 8 The welding assembly 702 includes a mounting sleeve 7021 fixedly mounted on the top of the electric slider 7014 and a welding gun 7022 fixedly mounted in the mounting sleeve 7021, and the tip of the welding gun 7022 is aligned with the connection between the Y-shaped tube and the tail tube.

[0050] See also Figure 1 , Figure 5 , Figure 6 and Figure 8 An ear plate extends from the front side of the movable plate 5013 on the left side, and an electric push rod 703 is fixedly installed on the front side of the ear plate. The output end of the electric push rod 703 slides through the ear plate and is fixedly connected to the guide plate 7012.

[0051] When in use, in the initial state, the guide plate 7012 is located at the frontmost side of the guide groove 7011 (such as Figure 6 As shown in the figure), when the clamping plates 5015 and the centering plate 5017 on the left and right sides are synchronously close to clamp the double-row tail throat 4, the short arc rail 7013 is connected with the long arc rail 7016 on the front side to form a complete annular slide rail. After completing the triangular automatic centering clamping of the double-row tail throat 4 and performing double locking and limiting, the electric slide rail is controlled to drive the welding gun 7022 to circle the annular slide rail for one circle to perform circumferential welding on the connection between the Y-shaped tube and the front tail pipe. After the welding of the front tail pipe is completed, the output end of the electric push rod 703 is controlled to push the guide plate 7012 to move backward along the guide groove 7011 until the guide plate 7012 moves to the rear end of the guide groove 7011. At this time, the short arc rail 7013 is connected with the long arc rail 7016 on the rear side to form a complete annular slide rail. Then, the electric slide rail is controlled to drive the welding gun 7022 to circle the annular slide rail for one circle, and the connection between the Y-shaped tube and the rear tail pipe is circumferentially welded. At this point, the welding work of the entire double-row tail throat 4 is completed. During the entire welding process, the short arc rail 7013 and the front and rear long arc rails 7016 are flexibly switched to quickly complete the circumferential welding of the connection between the Y-shaped tube and the front tail pipe and the rear tail pipe, thereby greatly improving the welding efficiency. The annular slide rail ensures that the movement trajectory of the welding gun 7022 is always consistent, making the weld more beautiful and the welding quality higher.

[0052] After welding is completed, the electric slider 7014 that has circled the annular slide rail for one week returns to the short arc rail 7013, and then, the output end of the control driving component 503 is contracted, driving the support plate 5011 to move to the left for reset, and at the same time, the right support plate 5011 is synchronously driven to move to the right for reset through the synchronization component 502, so that the two support plates 5011 move and reset synchronously. During the reset process, as the support plate 5011 moves, the insertion rod 6017 will be pulled out of the circular groove 6018 first, and at the same time, the pressure on the reset spring 1 5012 will gradually decrease for reset. During the pull-out process of the insertion rod 6017, the pull rope 6022 will gradually relax, and the pressure on the reset spring 3 6013 will gradually decrease for reset, thereby pushing the reset plate 6012 to move upward until the reset spring 3 6013 is completely reset. Then, the support plate 5 011 continues to move and the pull rope 6022 will continue to relax, so that the tension on the reset spring 2 6011 will gradually decrease and reset, thereby driving the reset plate 6012 to continue to move upward. Since the reset spring 3 6013 has been fully reset at this time, the reset plate 6012 continues to move upward and will pull the pressure plate 6014 upward through the reset spring 3 6013 to move away from the top of the single open end of the Y-shaped tube for reset. When the reset spring 1 5012 is fully reset, the support plate 5011 continues to move and will drive the moving plate 5013 to move away from the double-row tail throat 4 through the reset spring 1 5012, so that the splint 5015 and the centering plate 5017 are separated from the double-row tail throat 4 and reset. When the splint 5015 and the centering plate 5017 are fully reset, the reset plate 6012 is also fully reset and waits for the next welding process.

[0053] See also Figure 1 and Figure 3 The driving component 503 is a cylinder, and the limiting rod 1 5018 is away from the end of the support plate 5011, the limiting rod 2 6010 is away from the end of the reset plate 6012, and the limiting rod 3 6019 is away from the end of the pressure plate 6014, all of which are fixedly installed with limiting circular plates.

[0054] It should be noted that the limiting circular plate can limit the moving distance of the limiting rod 1 5018 , the limiting rod 2 6010 and the limiting rod 3 6019 .

[0055] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. An automatic welding robot for automobile parts, characterized in that: include: A frame (1) and a workbench (2) fixedly mounted on the top of the frame (1) and used for placing a double-row tail throat (4); a gantry (3) fixedly mounted on the top of the workbench (2); a triangular centering clamping unit (5) and a downward pressing double locking unit (6) are arranged between the left and right inner walls of the gantry (3); the triangular centering clamping unit (5) comprises two left-right symmetrical clamping assemblies (501) and a synchronization assembly (502); an adjustable annular welding unit (7) is arranged between the two clamping assemblies (501); the downward pressing double locking unit (6) comprises a pressing locking assembly (601) and a pulling assembly (602); the double-row tail throat (4) comprises a Y-shaped tube and two tail tubes connected to the double open ends of the Y-shaped tube; The clamping assembly (501) comprises a support plate (5011) and three return springs (5012) fixedly mounted on a side of the support plate (5011) away from the inner wall of the gantry (3); a moving plate (5013) is commonly mounted on one end of the three return springs (5012) away from the support plate (5011); three mounting rods (5014) are fixedly mounted on one side of the moving plate (5013) away from the support plate (5011); a clamping plate (5015) is fixedly mounted on one end of the mounting rod (5014) away from the support plate (5011); the three clamping plates (5015) are distributed in a triangular shape and correspond to the single opening end and the two tail pipes of the Y-shaped tube respectively; two front-to-back symmetrical connecting rods (5016) are fixedly mounted on the side of the clamping plate (5015) corresponding to the single opening end of the Y-shaped tube close to the support plate (5011); and a centering plate (5017) corresponding to the double opening ends of the Y-shaped tube is fixedly mounted on the bottom end of the connecting rod (5016); The left and right clamping assemblies (501) are close to each other to clamp the Y-shaped tube and the two tail pipes at the same time. At the same time, under the action of the centering plate (5017), the two exhaust ports at the double open ends of the Y-shaped tube are respectively aligned with the two tail pipes, and a triangular multi-point clamping and fixing is formed between the three clamping plates (5015).

2. The automatic welding robot for automobile parts according to claim 1, characterized in that: A driving component (503) is fixedly mounted on the left side of the gantry (3); an output end of the driving component (503) slides through the left inner wall of the gantry (3) and is fixedly connected to the left support plate (5011); and a plurality of limit rods (5018) that slide through the support plate (5011) are fixedly mounted on the side of the movable plate (5013) close to the support plate (5011).

3. The automatic welding robot for automobile parts according to claim 1, characterized in that: The adjustable annular welding unit (7) comprises a docking assembly (701) and a welding assembly (702) for welding the double-row tail throat (4) in cooperation with the docking assembly (701), wherein the docking assembly (701) comprises a guide groove (7011) provided on a left movable plate (5013) and a guide plate (7012) slidably connected to the guide groove (7011), a short arc rail (7013) being fixedly mounted on the top of the guide plate (7012), and the short arc rail (701 3) is slidably connected to the top of an electric slider (7014), two front-to-rear symmetrical fixed plates (7015) are fixedly installed on the left side of the movable plate (5013) on the right, a long arc rail (7016) is fixedly installed on the top of the fixed plate (7015), the short arc rail (7013) and the long arc rail (7016) are connected to form an annular slide rail, and the electric slider (7014) drives the welding assembly (702) to go around the annular slide rail for one circle to achieve circumferential welding of the connection between the Y-shaped tube and the tail tube.

4. The automatic welding robot for automobile parts according to claim 3, characterized in that: The welding assembly (702) comprises a mounting sleeve (7021) fixedly mounted on the top of the electric slider (7014) and a welding gun (7022) fixedly mounted in the mounting sleeve (7021), the gun head of the welding gun (7022) being aligned with the connection between the Y-shaped tube and the tail tube.

5. The automatic welding robot for automobile parts according to claim 3, characterized in that: An ear plate extends from the front side of the movable plate (5013) on the left side, and an electric push rod (703) is fixedly installed on the front side of the ear plate. The output end of the electric push rod (703) slides through the ear plate and is fixedly connected to the guide plate (7012).

6. The automatic welding robot for automobile parts according to claim 1, characterized in that: The synchronization component (502) comprises two slide grooves (5022) which are opened on the top of the workbench (2) and are symmetrical to each other. The bottoms of the left and right support plates (5011) are fixedly mounted with slide bars (5021). The two slide bars (5021) are respectively slidably connected to the left and right slide grooves (5022) and extend to the bottom of the slide grooves (5022). Racks (5023) are fixedly mounted on the rear side of the left slide bar (5021) and the front side of the right slide bar (5021). A gear (5024) meshing with the two racks (5023) is rotatably mounted on the bottom of the workbench (2). The two racks (5023) are rotationally symmetrically arranged at 180 degrees with the center of the gear (5024) as the center. Two L-shaped support plates (5025) which are symmetrical to each other are fixedly mounted on the bottom of the workbench (2). The two racks (5023) are respectively slidably connected to the left and right L-shaped support plates (5025).

7. The automatic welding robot for automobile parts according to claim 1, characterized in that: The pressure lock assembly (601) comprises two return springs (6011) fixedly mounted on the inner wall of the top of the gantry (3) and symmetrically arranged on the left and right; a return plate (6012) is commonly mounted on the bottom ends of the two return springs (6011); a pressure plate (6014) is fixedly mounted on the center position of the bottom of the return plate (6012) via a return spring (6013); two limit rods (6010) are fixedly mounted on the top of the return plate (6012) and slide through the inner wall of the top of the gantry (3) and symmetrically arranged on the left and right; the two return springs (6011) are respectively sleeved on the outside of the two limit rods (6010) on the left and right; a limit rod (6019) is fixedly mounted on the top of the pressure plate (6014) and slides through the return plate (6012); and the return spring (6013) is sleeved on the outside of the limit rod (6019).

8. The automatic welding robot for automobile parts according to claim 7, characterized in that: Two left-right symmetrical plug blocks (6015) are fixedly installed at the bottom of the pressing plate (6014); square grooves (6016) are provided on the tops of the two movable plates (5013); the two plug blocks (6015) respectively cooperate with the left and right square grooves (6016); plug rods (6017) are fixedly installed on the adjacent sides of the two support plates (5011); circular grooves (6018) are provided on the left and right sides of the pressing plate (6014); the two plug rods (6017) respectively cooperate with the left and right circular grooves (6018).

9. The automatic welding robot for automobile parts according to claim 7, characterized in that: The pulling assembly (602) comprises two fixed pulleys (6021) respectively fixedly mounted on the left and right inner walls of the gantry (3); a pull rope (6022) is wound around the outer side of the fixed pulley (6021); the top ends of the two pull ropes (6022) are fixedly connected to the reset plate (6012); and the bottom ends of the two pull ropes (6022) are respectively fixedly connected to the left and right support plates (5011).

10. The automatic welding robot for automobile parts according to claim 2, characterized in that: The driving component (503) is a cylinder.

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