An automated flexible welding line

Abstract

The application relates to the technical field of welding, and discloses an automatic flexible welding production line, which is used to solve the problem of errors caused by secondary positioning of pipe fittings and affecting the welding quality of a vehicle frame. The welding production line is provided with a positioner mechanism, a rotary table, a first inserting rod, a second inserting rod and an air pump. The rotary table drives the pipe fittings to overturn by half a circle, and the welding of the welding seams on the front and back sides can be completed without disassembling and re-clamping the pipe fittings, so that the positioning error of secondary clamping is reduced, and the production efficiency is improved. The first inserting rod and the second inserting rod are inserted into the head pipe and the seat pipe respectively, then the air pump sends air into the first inserting rod and the second inserting rod, so that the air flows in the pipe fittings, thereby continuously taking away the heat of the pipe wall in the welding seam area, reducing the welding heat input peak value, effectively reducing the welding thermal deformation of the thin-walled pipe fittings, and controlling the size precision of the vehicle frame.

Description

Technical Field

[0001] This application relates to the field of welding technology, and in particular to an automated flexible welding production line. Background Technology

[0002] The frame is the skeleton of a bicycle, bearing all the parts and directly determining its weight, rigidity, shock absorption, handling, and comfort. Existing frames are often mass-produced using welding production lines.

[0003] Some existing welding production lines, when welding the frame (such as welding the front triangle of the frame), clamp the head tube, upper tube, lower tube and seat tube separately. Then, the welding gun robotic arm welds the joint of the tubes. Then, the clamps are released, and the tubes are inverted halfway and clamped again so that the unwelded part faces the welding gun robotic arm. Finally, the welding gun robotic arm performs the final welding of the tubes. Through the above actions, the complete welding operation of the front triangle of the frame is achieved.

[0004] However, in the above process, the pipe fittings need to be clamped twice, which makes it easy for positioning errors to occur during the second clamping, thus affecting the welding quality of the frame. Summary of the Invention

[0005] This application proposes an automated flexible welding production line that eliminates the need for secondary clamping of pipe fittings, thereby solving the problem of errors occurring during secondary positioning of pipe fittings, which affect the welding quality of the vehicle frame.

[0006] To achieve the above objectives, this application adopts the following technical solution: an automated flexible welding production line, comprising: a mounting table, wherein positioner mechanisms are equidistantly arranged on the upper surface of the mounting table, the positioner mechanisms comprising: A rotating motor is fixedly mounted on the upper surface of the mounting platform at equal intervals via a mounting plate; The turntable is fixedly installed at the output end of the rotating motor; The turntable has symmetrically arranged sliding plates on the side facing away from the rotating motor, and the end of the sliding plate facing the rotating motor is radially slidably inserted into the turntable. A radial displacement motor is fixedly mounted on the outer circumference of the turntable; A screw is rotatably installed inside the turntable. One end of the screw is fixedly connected to the shaft of the radial displacement motor. The screw and the end of the slide plate facing the rotating motor form a threaded transmission connection. A first insert rod is provided between the two slide plates, away from the turntable. The first insert rods are arranged in pairs and form a sliding connection with the corresponding slide plate. A moving cylinder is fixedly installed on the opposite sides of the two slide plates. The telescopic rod of the moving cylinder is fixedly connected to the first insert rod. A second insert rod is provided between the two slide plates and near the turntable. The second insert rod is fixedly connected to the corresponding slide plate. Annular protrusions are provided on the outer circumference of both the first and second insert rods. The frame is clamped by the first and second insert rods. The head tube is fixed by the first insert rod and the annular protrusions. The seat tube is fixed by the second insert rod, the annular protrusions, and the slide plate.

[0007] Furthermore, both the No. 1 and No. 2 inserts are hollow cavities, and the opposite ends of the two No. 1 inserts are open. An air pump is fixedly installed on the side of the slide plate facing away from the frame. The air pump has two air supply ends and one air extraction end. The air extraction end of the air pump is connected to the external environment, and the air supply end of the air pump is connected to a flexible hose. The two flexible hoses are respectively connected to a single No. 1 insert and No. 2 insert. Air holes are opened on the circumferential walls of both No. 1 and No. 2 inserts. When the No. 1 and No. 2 inserts are fixed to the frame, the air holes are located inside the frame.

[0008] Furthermore, the air hole is located at the position where the first and second insert rods face away from the upper tube of the frame. The diameter of the section of the first and second insert rods extending into the frame is smaller than the diameter of the section at the end of the frame tube. The air hole is opened on the section of the first and second insert rods extending into the frame.

[0009] Furthermore, spiral blades are fixedly installed on the outer circumferential surfaces of both the first and second insertion rods, and the outer end of the air hole is opened between the threads of the spiral blade near the annular protrusion.

[0010] Furthermore, both the No. 1 and No. 2 insertion rods are made of stainless steel, and the annular protrusion contacts the side of the corresponding pipe fitting with an embedded fluororubber sealing ring.

[0011] Furthermore, a fixing ring is fixedly installed in the inner cavity of both the first and second insertion rods, and a rotating blade is rotatably installed on the inner side of the fixing ring. The rotation direction of the rotating blade is the same as that of the helical blade.

[0012] Furthermore, a rotating rod is fixedly installed at the center position of the rotating blade.

[0013] Furthermore, the rotating rod is made of samarium cobalt.

[0014] This application has the following beneficial effects: This application provides an automated flexible welding production line that, through the setting of a positioner mechanism, drives the pipe fitting to rotate half a circle via a turntable. The entire process can be completed without disassembling and re-clamping the pipe fitting, thereby reducing the positioning error of secondary clamping and improving production efficiency.

[0015] By setting up the No. 1 and No. 2 insertion rods and the air pump, the No. 1 and No. 2 insertion rods are inserted into the head tube and seat tube respectively. Then, the air pump delivers air into the No. 1 and No. 2 insertion rods, so that the air flows inside the tube and continuously removes the heat from the tube wall in the weld area, reducing the peak welding heat input, effectively reducing the welding heat deformation of thin-walled tubes, and controlling the dimensional accuracy of the frame.

[0016] By using spiral blades and vents, air entering the pipe through the vents flows spirally along the spiral blades, applying axial pressure to them. Since the spiral blades are fixedly connected to the first and second insertion rods, both are subjected to the same axial pressure, further clamping the corresponding annular protrusions to the frame and improving its fixing accuracy. Simultaneously, the raised edges of the spiral blades act as multiple annular chip-blocking walls. When high-temperature welding chips splashed from the weld seam fly towards the vent side, they are first intercepted by the raised threaded edges, preventing them from directly reaching the vent opening. In addition, the airflow along the spiral blades forms a stable vortex. Once the welding chips splashed into the pipe enter the airflow field, they are quickly thrown towards the inner wall of the pipe by the centrifugal force of the vortex. Subsequently, the spiral airflow flowing along the pipe wall is directed to the upper and lower pipes, and finally discharged from the seat tube and bottom bracket. Welding chips do not deposit on the surface of the spiral blades, nor do they accumulate near the vents, achieving a coordinated effect of cooling, air supply, and chip blocking, reducing welding chip residue in the pipe and avoiding affecting the quality of subsequent electrophoresis and dip plating processes. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0018] This application can be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the composition and structure of the positioner mechanism of the present invention; Figure 3 This is a schematic diagram of the fixed state of the vehicle frame of the present invention; Figure 4 This is a schematic diagram showing the positions of the first and second insertion rods of the present invention; Figure 5 This is a schematic diagram showing the arrangement of the spiral blades of the present invention.

[0019] In the diagram: 1. Mounting platform; 2. Positioner mechanism; 20. Rotary motor; 21. Turntable; 22. Slide plate; 23. Radial displacement motor; 24. Screw; 3. Insert rod No. 1; 4. Moving cylinder; 5. Insert rod No. 2; 6. Annular protrusion; 7. Frame; 8. Air pump; 9. Hose; 10. Air hole; 11. Helical blade; 12. Fixing ring; 13. Rotating blade; 14. Rotating rod. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] Example 1: Please refer to Figures 1-5 An automated flexible welding production line includes a mounting platform 1. A positioner mechanism 2 is equidistantly arranged on the upper surface of the mounting platform 1. The positioner mechanism 2 includes a rotary motor 20, a turntable 21, a sliding plate 22, a radial displacement motor 23, and a screw 24. The rotary motor 20 is equidistantly mounted on the upper surface of the mounting platform 1 via a mounting plate. The output end of the rotary motor 20 is bolted to the turntable 21. Sliding plates 22 are symmetrically arranged on the side of the turntable 21 facing away from the rotary motor 20. The end of the sliding plate 22 facing the rotary motor 20 forms a radial sliding connection with the turntable 21. The radial displacement motor 23 is fixedly mounted on the outer circumference of the turntable 21. The screw 24 is rotatably mounted inside the turntable 21. One end of the screw 24 is fixedly connected to the shaft of the radial displacement motor 23. The screw 24 and the end of the sliding plate 22 facing the rotary motor 20 form a threaded transmission. A first insert rod 3 is positioned between the two side slides 22, away from the turntable 21. The first insert rod 3 is installed in pairs, forming a sliding connection with the corresponding slide 22. A movable cylinder 4 is fixedly installed on the opposite sides of the two side slides 22. The telescopic rod of the movable cylinder 4 is fixedly connected to the first insert rod 3. A second insert rod 5 is positioned between the two side slides 22 and close to the turntable 21. The second insert rod 5 is fixedly connected to the corresponding slide 22. Annular protrusions 6 are provided on the outer circumference of both the first insert rod 3 and the second insert rod 5. The frame 7 (front triangle, including head tube, top tube, bottom tube and seat tube) is clamped by the first insert rod 3 and the second insert rod 5. The head tube is fixed by the first insert rod 3 and the annular protrusions 6. The seat tube (including the bottom bracket) is fixed by the second insert rod 5, the annular protrusions 6 and the slide 22.

[0022] In use, first, place the head tube and seat tube vertically between the two sliding plates 22. Then, the radial displacement motor 23 drives the screw 24 to rotate, causing the two sliding plates 22 to move closer together and drive the first insertion rod 3 to be inserted into the head tube, and the second insertion rod 5 to be inserted into the upper end of the seat tube, until the annular protrusions 6 on the two first insertion rods 3 clamp the two ends of the head tube (at this time, the openings of the two first insertion rods 3 are in contact). The annular protrusion 6 on the second insertion rod 5 clamps the two ends of the seat tube with the sliding plate 22 on the other side. Then, place the upper tube and lower tube between the head tube and the seat tube, and make the upper tube and lower tube abut against the seat tube (the two ends of the upper tube and lower tube are the corresponding arc ends of the head tube and the seat tube). When the two parts are joined together, they can be tightly locked. Then, the telescopic rod of the moving cylinder 4 extends, so that the first insertion rod 3 drives the head tube to abut against the corresponding ends of the upper and lower tubes, so that the head tube and the seat tube clamp the upper and lower tubes. Finally, the external welding gun robotic arm welds the weld seam on the side corresponding to the abutment of the pipe fitting. After the welding is completed, the rotating motor 20 drives the turntable 21 to rotate half a revolution, so that the weld seam on the other side of the abutment of the pipe fitting faces the welding gun robotic arm, and the welding gun robotic arm welds the pipe fitting. With the above settings, the welding of the fillet weld seam on both sides can be completed without disassembling and re-clamping the pipe fitting. This reduces the positioning error of secondary clamping and improves production efficiency. In addition, the pipe fitting is fixed by using the inner support of No. 1 insert rod 3 and No. 2 insert rod 5 and the end face of the annular protrusion 6. The upper and lower pipes are fixed by clamping between the head pipe and the seat pipe. All the clamps are located in the inner cavity of the pipe fitting. The outer weld seam is completely unobstructed. The welding torch has 100% accessibility. It is very suitable for automatic robotic welding and will not have the problem of clamps interfering with the welding torch. After welding is completed, the radial displacement motor 23 is rotated, causing the screw 24 to move the two side slides 22 away from each other. Then, the frame 7 is removed.

[0023] Please see Figures 1-5 Both the first insertion rod 3 and the second insertion rod 5 are hollow cavities. The opposite ends of the two first insertion rods 3 are open. An air pump 8 is fixedly installed on the side of the slide plate 22 facing away from the frame 7. The air pump 8 has two air supply ends and one air extraction end. The air extraction end of the air pump 8 is connected to the external environment. The air supply end of the air pump 8 is connected to a hose 9. The two hoses 9 are respectively connected to a single first insertion rod 3 and a second insertion rod 5. Air holes 10 are opened on the circumferential walls of the first insertion rod 3 and the second insertion rod 5. When the first insertion rod 3 and the second insertion rod 5 are fixed to the frame 7, the air holes 10 are located inside the frame 7.

[0024] After the first insertion rod 3 and the second insertion rod 5 are inserted and fixed to the frame 7, the air pump 8 delivers compressed air to the hollow cavity of each first insertion rod 3 and the second insertion rod 5 through the hose 9. The air in the cavity of the first insertion rod 3 is then delivered to the cavity of the other first insertion rod 3 through the docking opening. After that, the compressed air is discharged into the head tube and the seat tube through the air hole 10. Since there are through holes at the welding points between the head tube, the upper tube, the lower tube and the seat tube, and there are also through holes at the welding points between the seat tube and the five-way connector, there is a complete channel in the inner cavity of the tube (which facilitates subsequent whole-vehicle electrophoresis, pickling, wire embedding, etc.). The discharged air then enters the upper tube and the lower tube through the head tube, passes through the seat tube, and is discharged into the external environment from the five-way connector. Through the movement of the air in the tube, the heat of the tube wall in the weld area is continuously carried away, reducing the peak value of welding heat input, effectively reducing the welding heat deformation of thin-walled tubes, and controlling the dimensional accuracy of the frame. At the same time, it avoids high-temperature oxidation of the inner wall of the pipe and improves the cleanliness of the inner cavity of the pipe (the temperature of the pipe wall during welding can reach hundreds of degrees Celsius. Under high temperature, the inner wall is prone to oxidation and blackening, and oxide scale is produced. The continuous airflow can quickly reduce the temperature of the pipe wall and carry away the high-temperature oxidation debris, greatly reducing the degree of oxidation of the inner wall, reducing the subsequent pickling and cleaning processes, and also avoiding oxide scale residue from affecting the electrophoresis and coating quality of the frame).

[0025] Example 2: Please refer to Figures 1-5 The air hole 10 is located on the part of the first insertion rod 3 and the second insertion rod 5 facing away from the upper tube of the frame 7. The diameter of the part of the first insertion rod 3 and the second insertion rod 5 that extends into the frame 7 is smaller than the diameter of the part of the first insertion rod 3 and the second insertion rod 5 that is located at the end of the tube of the frame 7. The air hole 10 is located on the part of the first insertion rod 3 and the second insertion rod 5 that extends into the frame 7.

[0026] With the above settings, the pores 10 face away from the weld, which prevents the welding spatter from adhering to the pores 10, making the pores 10 less likely to be blocked and preventing the cooling effect of the pipe from being affected. Meanwhile, by changing the diameter of the first insertion rod 3 and the second insertion rod 5, the air discharged from the air hole 10 into the frame 7 will form an annular air layer in the head tube and seat tube, which will allow the welding chips that splash into the tube from the weld to cool down quickly, thereby preventing the welding chips from sticking to the inner wall of the tube and affecting the subsequent processing of the tube (the air hole sprays out towards the tube wall opposite the weld, and the airflow flows in an annular manner along the tube wall, which is a wall-mounted convection heat transfer, rather than a direct impact on the back of the molten pool. The cooling of the weld area is achieved slowly through heat conduction through the tube wall, which is uniform controlled cooling rather than rapid cooling, and will not cause a sudden change in the temperature of the molten pool or molten pool disorder, and will not destroy the stability of the welding process at all). The gas flows openly along the entire internal channel of the pipe, and only a slight positive pressure is maintained inside the pipe (usually 0.01~0.03MPa is sufficient to meet the cooling requirements). It will not form high pressure and spray outward from the butt joint. Therefore, it will not interfere with the welding torch at all and will not cause defects such as weld oxidation and porosity. The mainstream materials for bicycle frames are 6-series aluminum alloy, low-carbon chromium-molybdenum steel, and 304 stainless steel, none of which have a strong tendency to harden. This controlled cooling method, which evenly removes excess heat along the tube wall, will only reduce the overall heat input peak and will not cause local overcooling, thus completely avoiding problems such as hardening cracks.

[0027] Please see Figures 1-5 Spiral blades 11 are fixedly installed on the outer circumference of both the first insertion rod 3 and the second insertion rod 5. The outer end of the air hole 10 is opened between the threads of the spiral blade 11 near the annular protrusion 6.

[0028] By setting the spiral blades 11, when air enters the pipe from the air hole 10, it will flow spirally along the spiral blades 11, thereby applying axial pressure to the spiral blades 11. Since the spiral blades 11 are fixedly connected to the first insertion rod 3 and the second insertion rod 5, both of them are also subjected to axial pressure, thereby causing the corresponding annular protrusions 6 to further clamp the frame 7 and improve the fixing accuracy of the frame 7. At the same time, the blocking and guiding of the spiral blades 11 further prevents the welding chips from clogging the pores 10 and avoids affecting the cooling effect of the pipe fittings (the raised edges of the spiral blades 11 are equivalent to multiple annular chip-blocking walls. When the high-temperature welding chips splashed from the weld fly to the side of the pores 10, they will first be blocked by the raised thread edges and cannot directly reach the opening of the pores 10). The airflow along the spiral blade 11 forms a stable vortex. Once the welding slag splashed into the pipe enters the airflow field, it will be quickly thrown towards the inner wall of the pipe by the centrifugal force of the vortex. Then, the spiral airflow flowing along the pipe wall is directed to transport the slag into the upper and lower pipes, and finally discharged from the seat pipe and the bottom bracket. The welding slag will not be deposited on the surface of the spiral blade 11, nor will it accumulate near the air hole 10. This achieves the linkage effect of cooling air supply and chip blocking, reducing the welding slag residue in the pipe and avoiding affecting the quality of subsequent electrophoresis and dip plating processes. In addition, relying on the aforementioned circumferential swirling flow, a uniform circumferential pressure field is formed. The centrifugal effect of the swirling flow causes the air pressure to act uniformly on the entire circumference of the pipe wall, forming an air film support effect. This keeps the pipe and the first insertion rod 3 and the second insertion rod 5 in a coaxial and centered state, preventing unilateral tilting. The uniform circumferential pressure also ensures that the pipe wall is subjected to balanced forces, avoiding minor displacement of the pipe caused by local pressure differences.

[0029] Please see Figures 1-5 Both the No. 1 insertion rod 3 and the No. 2 insertion rod 5 are made of 316 austenitic stainless steel, and the annular protrusion 6 has a fluororubber sealing ring embedded in the side of the corresponding pipe fitting.

[0030] 316 austenitic stainless steel has a low coefficient of thermal expansion and minimal deformation at high welding temperatures, which ensures that the gap between the spiral blade 11 and the pipe wall remains stable throughout the process. This prevents the air film alignment effect from diminishing due to temperature fluctuations and keeps the positioning accuracy continuously controllable. Fluororubber sealing rings have good elasticity compensation, automatically filling the flatness error of the pipe end face, strengthening the end face sealing effect, reducing air leakage at the pipe opening, and ensuring stable air cooling pressure inside the pipe.

[0031] Example 3: Please refer to Figures 1-5 Both the first insertion rod 3 and the second insertion rod 5 have a fixed ring 12 installed in their inner cavities. A rotating blade 13 is rotatably installed on the inner side of the fixed ring 12. A rotating rod 14 is fixedly installed at the center of the rotating blade 13. The rotation direction of the rotating blade 13 is the same as the rotation direction of the spiral blade 11.

[0032] During the process of the air pump 8 delivering compressed air to the inner cavity of the first insertion rod 3 and the second insertion rod 5 through the hose 9, the airflow in the inner cavity impacts the rotating blade 13, causing the rotating rod 14 to rotate coaxially. The rotating rod 14 continuously adds circumferential momentum to the airflow, so that the direction and speed of the airflow ejected from the air hole 10 are perfectly matched with the spiral trajectory of the outer spiral blade 11, thereby reducing the turbulence loss of the airflow and improving the wall-mounted cooling, air film alignment, and dynamic pressure clamping effects of the outer spiral blade 11. Meanwhile, the rotational inertia of the rotating rod 14 itself is equivalent to a "mechanical fluid filter", which can automatically absorb the pressure pulsation and flow fluctuation of the air pump supply, so that the air outlet speed of the air hole 10 is stable and without sudden changes, and there will be no problem of instantaneous flow rate being too high / too low. This avoids the vibration of the air film support of the outer spiral blade 11, making the workpiece positioning accuracy more stable during the welding process, the cooling intensity uniform throughout the process, and the weld heat input consistent. Furthermore, the airflow-driven rotating rod 14 possesses a gyroscopic axis-stabilizing effect, which can suppress the slight radial / angular offset of the first insertion rod 3 and the second insertion rod 5. (For a high-speed rotating rigid body, in the absence of strong external torque interference, the rotation axis will strive to maintain its original spatial orientation and resist the deflection and tilt caused by external forces. The sources of micro-disturbances under welding conditions are: the impact of the welding torch airflow, the slight lateral force generated by the thermal expansion of the pipe, and the slight lateral movement caused by the tooling gap. These disturbances are small-amplitude, low-frequency, and weak-torque, which are just within the suppression range of the gyroscopic axis-stabilizing property. If there is a lateral skew torque, the rotating rod 14 will not directly offset, but will generate a slight precession to cancel it out.) Most of the lateral offset trend limits the tilting and radial slight sliding of No. 1 insert rod 3 and No. 2 insert rod 5. At the same time, it can form a double stable linkage with the air film support of the outer wall spiral blade 11 (welding heat deformation can easily cause No. 1 insert rod 3 and No. 2 insert rod 5 to tilt slightly inside the pipe, causing the gap between the spiral blade 11 on one side and the inner wall of the pipe to become smaller and larger on one side, resulting in the imbalance of the air film support. The gyro fixed axis of the rotating rod 14 forcibly locks the axis of No. 1 insert rod 3 and No. 2 insert rod 5, weakens the tilting moment, and ensures that the two are always coaxial with the pipe, so that the circumferential air film pressure of the outer wall spiral blade 11 is evenly distributed. The two are superimposed, and the tilt offset can be reduced by more than 60%; The rotation of the turntable 21 and the slight vibration of the cylinder clamping cause micron-level radial movement of the first insertion rod 3 and the second insertion rod 5, resulting in misalignment of the pipe through hole and fluctuating airflow. The gyroscope's rotation axis resists the centrifugal disturbance caused by radial eccentricity, and together with the elastic air film buffer between the spiral blade 11 and the pipe wall, a double-layer protection is formed by the internal rigid fixed axis of the gyroscope and the external flexible vibration damping of the air film, which greatly reduces the radial micro-displacement of the first insertion rod 3 and the second insertion rod 5.

[0033] Please see Figures 1-5 The swivel rod 14 is made of samarium cobalt.

[0034] Samarium cobalt has a high density and a higher moment of inertia for the same volume, which can directly enhance the gyroscope's axis stability and improve the micro-deviation suppression effect.

Claims

1. An automated flexible welding production line, comprising: Mounting platform (1), wherein positioner mechanisms (2) are equidistantly arranged on the upper surface of the mounting platform (1), and the positioner mechanisms (2) include: A rotating motor (20) is fixedly mounted on the upper surface of the mounting platform (1) at equal intervals via a mounting plate; The turntable (21) is fixedly installed at the output end of the rotating motor (20); The slide plate (22) is symmetrically arranged on the side of the turntable (21) facing away from the rotating motor (20). The end of the slide plate (22) facing the rotating motor (20) forms a radial sliding connection with the turntable (21). A radial displacement motor (23) is fixedly installed on the outer circumference of the turntable (21); A screw (24) is rotatably installed inside a turntable (21). One end of the screw (24) is fixedly connected to the shaft of a radial displacement motor (23). The screw (24) and the end of the slide plate (22) facing the rotating motor (20) form a threaded transmission connection. The feature is that a first insertion rod (3) is provided between the two slide plates (22). The first insertion rod (3) is away from the turntable (21). The first insertion rod (3) is provided in pairs. The first insertion rod (3) forms a sliding insertion connection with the corresponding slide plate (22). Movable air is fixedly installed on the opposite sides of the two slide plates (22). Cylinder (4), the telescopic rod of the movable cylinder (4) is fixedly connected to the first insert rod (3), and the second insert rod (5) is provided between the two side slides (22) and near the turntable (21). The second insert rod (5) is fixedly connected to the corresponding slide (22). The outer circumference of the first insert rod (3) and the second insert rod (5) are provided with annular protrusions (6). The frame (7) is clamped by the first insert rod (3) and the second insert rod (5). The head tube is fixed by the first insert rod (3) and the annular protrusions (6). The seat tube is fixed by the second insert rod (5), the annular protrusions (6) and the slide (22).

2. The automated flexible welding production line according to claim 1, characterized in that, Both the first insertion rod (3) and the second insertion rod (5) are hollow cavities. The opposite ends of the two first insertion rods (3) are open. An air pump (8) is fixedly installed on the side of the slide plate (22) facing away from the frame (7). The air pump (8) has two air supply ends and one air extraction end. The air extraction end of the air pump (8) is connected to the external environment. The air supply end of the air pump (8) is connected to a hose (9). The two hoses (9) are respectively connected to a single first insertion rod (3) and a second insertion rod (5). Air holes (10) are opened on the circumferential walls of the first insertion rod (3) and the second insertion rod (5). When the first insertion rod (3) and the second insertion rod (5) are fixed to the frame (7), the air holes (10) are located inside the frame (7).

3. The automated flexible welding production line according to claim 2, characterized in that, The air hole (10) is located at the position where the first insertion rod (3) and the second insertion rod (5) face away from the upper tube of the frame (7). The diameter of the first insertion rod (3) and the second insertion rod (5) extending into the frame (7) is smaller than the diameter of the section of the first insertion rod (3) and the second insertion rod (5) at the end of the tube of the frame (7). The air hole (10) is opened on the section where the first insertion rod (3) and the second insertion rod (5) extend into the frame (7).

4. The automated flexible welding production line according to claim 3, characterized in that, Spiral blades (11) are fixedly installed on the outer circumference of both the first insertion rod (3) and the second insertion rod (5), and the outer end of the air hole (10) is opened between the threads of the spiral blade (11) near the annular protrusion (6).

5. An automated flexible welding production line according to claim 1, characterized in that, Both the first insertion rod (3) and the second insertion rod (5) are made of stainless steel, and the annular protrusion (6) has a fluororubber sealing ring embedded in the side of the corresponding pipe fitting.

6. An automated flexible welding production line according to claim 4, characterized in that, The inner cavities of the first insertion rod (3) and the second insertion rod (5) are both fixedly installed with a fixing ring (12). A rotating blade (13) is rotatably installed on the inner side of the fixing ring (12). The rotation direction of the rotating blade (13) is the same as that of the spiral blade (11).

7. An automated flexible welding production line according to claim 6, characterized in that, A rotating rod (14) is fixedly installed at the center of the rotating blade (13).

8. An automated flexible welding production line according to claim 7, characterized in that, The rotating rod (14) is made of samarium cobalt.

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