A turning and positioning machine for welding heavy box girders

Abstract

The present invention discloses a turning and positioning machine for welding heavy box girders, which relates to the technical field of turning and positioning machines and includes a guide rail. It also includes a clamping device. Among them, a turning frame is slidably installed on the top of the guide rail. A turning assembly is arranged on the left side of the turning frame. A fixed-side jacking mechanism is arranged on the inner wall of the turning frame. A fixed-side clamping mechanism is arranged on the top of the fixed-side jacking mechanism. A turning-side jacking mechanism is arranged on the inner wall of the turning frame. A turning-side clamping frame is arranged on the top of the turning-side jacking mechanism. Among them, the clamping device includes a fixed rod, a displacement device, a clamping jaw, a limiting groove, a detection groove, a detection rod, a detection plate, a support rod, a hollow plate, a limiting plate and a support hole. The clamping jaw cannot move further to prevent the clamping jaw from excessively clamping the heavy box girder. Through reasonable clamping force, the deformation of the heavy box girder can be prevented, ensuring that the heavy box girder maintains its original shape during the welding and processing process, and improving the subsequent processing accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of turnover positioners, and particularly to a turnover positioner for welding heavy box girders. Background Art

[0002] A turnover positioner for welding heavy box girders usually consists of a turnover frame, a fixed-side clamping mechanism, a turnover-side jacking mechanism, a protection device and other parts.

[0003] The patent with the patent announcement number CN211305393U relates to a turnover positioner for welding, belonging to the technical field of turnover positioners. This patent solves the technical problems such as low welding efficiency of the existing turnover positioner for welding. This patent includes a frame, on which there is a turnover arm support, on which there are a first turnover arm and a second turnover arm capable of turning over a steel pipe bundle, at the rear side of the frame there is a jaw mechanism for clamping the steel pipe bundle and a lifting mechanism capable of driving the jaw mechanism to lift, and on the frame there is also a driving mechanism capable of pushing the turnover arm support to move horizontally. This patent improves the welding rate of the turnover positioner for welding.

[0004] In the above patent, by providing a driving mechanism on the frame that can push the turnover arm support to move horizontally, the welding rate of the turnover positioner for welding is improved. However, it is difficult to prevent the jaws from overly clamping the heavy box girder. Overly clamping will exert too much force on the box girder, causing its structure to deform, thereby affecting the accuracy and quality of the heavy box girder during subsequent welding and processing. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a turnover positioner for welding heavy box girders, which solves the problems presented in the above background art.

[0006] To achieve the above object, the present invention is realized through the following technical solutions: A turnover positioner for welding heavy box girders, including a guide rail, further including a clamping device. Among them, a turnover frame is slidably installed on the top of the guide rail. A turnover assembly is arranged on the left side of the turnover frame. A fixed-side jacking mechanism is arranged on the inner wall of the turnover frame. A fixed-side clamping mechanism is arranged on the top of the fixed-side jacking mechanism. A turnover-side jacking mechanism is arranged on the inner wall of the turnover frame. A turnover-side clamping frame is arranged on the top of the turnover-side jacking mechanism. Among them, the clamping device includes a fixed rod, a displacement device, a claw, a limit groove, a detection groove, a detection rod, a detection plate, a support rod, a hollow plate, a limit plate and a support hole. When the support rod cannot continue to move towards the heavy box girder, the claw cannot continue to move, and the inability of the claw to continue moving prevents the claw from over-clamping the heavy box girder. The fixed rod fixedly penetrates the inner and outer walls of the turnover-side clamping frame. The displacement device is slidably installed on the circumferential surface of the fixed rod. The claw is fixedly installed on the top of the displacement device. The limit groove is opened on the left side of the turnover-side clamping frame. The detection groove is opened on the surface of the claw. The detection rod fixedly penetrates the front and rear walls of the claw. The detection plate is fixedly installed on the rear side of the detection rod. The support hole is opened on the left side wall of the claw. The support rod is fixedly installed on the inner wall of the support hole. The hollow plate is slidably installed on the circumferential surface of the support rod. The limit plate is slidably installed on the inner wall of the hollow plate.

[0007] A first spring is arranged between the detection groove and the detection rod. The first spring can drive the detection rod to reset. The top of the claw is set as an inclined surface. The end of the detection rod close to the hollow plate is set as an arc surface.

[0008] According to the above technical solution, a second spring is arranged between the support rod and the hollow plate. The second spring can drive the hollow plate to reset. A third spring is arranged between the hollow plate and the limit plate. One end of the third spring is arranged on the inner wall of the hollow plate, and the other end is arranged on the top of the limit plate. The third spring can drive the limit plate to reset. The bottom of the limit plate is set as an inclined surface.

[0009] According to the above technical solution, a protection device for preventing the heavy box girder from slipping is arranged on the inner wall of the turnover-side clamping frame. A detection device is arranged on the inner wall of the turnover-side clamping frame. The protection device includes a load-bearing plate, a load-bearing rod, a linkage plate, a load-bearing disc and an L-shaped rod. When the detection rod is extruded by the hollow plate and moves away from the support rod, the movement of the detection rod away from the support rod drives the detection plate to move to further clamp the heavy box girder. The load-bearing plate is fixedly installed on the inner wall of the turnover-side clamping frame. The load-bearing rod fixedly penetrates the upper and lower walls of the load-bearing plate. The linkage plate is fixedly installed on the circumferential surface of the load-bearing rod. The load-bearing disc is fixedly installed on the bottom of the load-bearing rod. The L-shaped rod is fixedly installed on the circumferential surface of the load-bearing rod.

[0010] According to the above technical solution, a load-bearing spring is arranged between the load-bearing plate and the load-bearing rod, and the load-bearing rod can be driven to reset by the load-bearing spring. A square plate is fixedly installed at the top of the load-bearing rod, and the linkage plate is in contact with the hollow plate.

[0011] According to the above technical solution, the detection device includes a detection frame, a detection plate, a detection rod, a protection frame, a protection plate, a protection rod, a button and a protection hole. When the protection rod moves away from the contact with the groove and releases the limit on the button, after the limit on the button is released, manually press the button to drive the flipping assembly to perform a flipping operation. The detection frame is fixedly installed on the top of the load-bearing plate, the detection plate is slidably installed on the inner wall of the detection frame, the detection rod is fixedly installed on the top of the detection plate, the protection frame is fixedly installed on the inner wall of the flipping side clamping frame, the protection plate is slidably installed on the inner wall of the protection frame, the protection rod is fixedly installed on the front side of the protection plate, the button is fixedly installed on the inner wall of the flipping side clamping frame, and the protection hole is opened on the inner wall of the flipping side clamping frame.

[0012] According to the above technical solution, a hose is arranged between the detection frame and the protection frame, and a fourth spring is arranged between the detection frame and the detection plate. One end of the fourth spring is arranged on the inner wall of the detection frame, and the other end is arranged at the bottom of the detection plate. The detection plate can be driven to reset by the fourth spring, and the button is electrically connected to the flipping assembly.

[0013] According to the above technical solution, a liquid is arranged inside the detection frame, a liquid is arranged inside the protection frame, and a rubber ring is arranged between the protection rod and the protection frame. The sealing performance between the protection rod and the protection frame can be enhanced by the rubber ring, and a groove is arranged on the circumferential surface of the button.

[0014] The present invention provides a flipping and positioning machine for welding heavy box girders. It has the following beneficial effects:

[0015] (1) For the flipping and positioning of the heavy box girder for welding, the detection plate and the clamping jaws move to contact the heavy box girder and squeeze and fix the heavy box girder, and the heavy box girder is fixedly flipped. Through the fixed flipping, the stability of the welding workpiece during the welding process can be ensured, the welding angle and position are more accurate, thereby improving the quality of the welding joint and reducing weld defects. Since the support rod cannot continue to move towards the direction closer to the heavy box girder, the clamping jaws cannot continue to move, and the clamping jaws cannot continue to move to prevent the clamping jaws from over-clamping the heavy box girder. Through reasonable clamping force, the deformation of the heavy box girder can be prevented, and the original shape of the heavy box girder can be maintained during the welding and processing, improving the subsequent processing accuracy.

[0016] (2) The flipping and positioning device for welding heavy box girders drives the load-bearing rod to move downward through the downward movement of the linkage plate. The downward movement of the load-bearing rod drives the L-shaped rod to move downward to assist in fixing the top of the heavy box girder. Through the auxiliary fixation, it can effectively prevent the heavy box girder from tilting or shaking due to its own weight or external forces during the welding process, ensuring the stability of the heavy box girder. The detection rod moves away from the support rod under the extrusion of the hollow plate. The movement of the detection rod away from the support rod drives the detection plate to move to further clamp the heavy box girder, enhancing the clamping force can reduce the safety hazard caused by the heavy box girder slipping, preventing accidents, and thus protecting the safety of the operator.

[0017] (3) The flipping and positioning device for welding heavy box girders drives the protection plate to move away from the bearing plate under the extrusion of the liquid entering the inside of the protection frame. The movement of the protection plate away from the bearing plate drives the protection rod to move. The movement of the protection rod disengages from the contact with the groove and releases the limit on the button. After the limit on the button is released, manually press the button to drive the flipping assembly to perform the flipping operation. By detecting that the heavy box girder is stably clamped before pressing the button for the flipping operation, it can effectively reduce the risk of the workpiece accidentally slipping or loosening due to unstable clamping, further ensuring the safety of the operator. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the positional structure of the flipping frame and the flipping assembly of the present invention;

[0020] Figure 3 It is a schematic diagram of the internal structure of the flipping assembly of the present invention;

[0021] Figure 4 It is a schematic diagram of the positional structure of the flipping side clamping frame and the limiting groove of the present invention;

[0022] Figure 5 It is a schematic diagram of the positional structure of the displacement device and the clamping jaw of the present invention;

[0023] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure of part A;

[0024] Figure 7 For the present invention Figure 5 Enlarged schematic diagram of the structure of part B;

[0025] Figure 8 It is a schematic diagram of the positional structure of the detection plate and the detection rod of the present invention;

[0026] Figure 9 It is a schematic diagram of the internal structure of the detection frame of the present invention.

[0027] In the figure: 1, guide rail; 2, turnover frame; 3, turnover assembly; 4, fixed-side jacking mechanism; 5, fixed-side clamping mechanism; 6, turnover-side jacking mechanism; 7, turnover-side clamping frame; 8, fixed rod; 9, displacement device; 10, jaw; 11, limit groove; 12, detection groove; 13, detection rod; 14, detection plate; 15, support rod; 16, hollow plate; 17, limit plate; 181, load-bearing plate; 182, load-bearing rod; 183, linkage plate; 184, load-bearing spring; 185, load-bearing disc; 186, L-shaped rod; 187, square plate; 191, detection frame; 192, detection plate; 193, detection rod; 194, protection frame; 195, protection plate; 196, protection rod; 197, button; 198, protection hole; 20, support hole. Specific implementation mode

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figures 1-7 For one embodiment of the present invention: A turnover and displacement machine for welding heavy box girders includes a guide rail 1 and also includes a clamping device. Among them, a turnover frame 2 is slidably installed on the top of the guide rail 1. A turnover assembly 3 is arranged on the left side of the turnover frame 2. A fixed-side jacking mechanism 4 is arranged on the inner wall of the turnover frame 2. A fixed-side clamping mechanism 5 is arranged on the top of the fixed-side jacking mechanism 4. A turnover-side jacking mechanism 6 is arranged on the inner wall of the turnover frame 2. A turnover-side clamping frame 7 is arranged on the top of the turnover-side jacking mechanism 6. Among them, the clamping device includes a fixed rod 8, a displacement device 9, a jaw 10, a limit groove 11, a detection groove 12, a detection rod 13, a detection plate 14, a support rod 15, a hollow plate 16, a limit plate 17 and a support hole 20. The fixed rod 8 fixedly penetrates the inner and outer walls of the turnover-side clamping frame 7. The displacement device 9 is slidably installed on the circumferential surface of the fixed rod 8. The jaw 10 is fixedly installed on the top of the displacement device 9. The limit groove 11 is opened on the left side of the turnover-side clamping frame 7. The detection groove 12 is opened on the surface of the jaw 10. The detection rod 13 fixedly penetrates the front and rear walls of the jaw 10. The detection plate 14 is fixedly installed on the rear side of the detection rod 13. The support hole 20 is opened on the left side wall of the jaw 10. The support rod 15 is fixedly installed on the inner wall of the support hole 20. The hollow plate 16 is slidably installed on the circumferential surface of the support rod 15. The limit plate 17 is slidably installed on the inner wall of the hollow plate 16. By means of reasonable clamping force, the deformation of the heavy box girder can be prevented, ensuring that the heavy box girder maintains its original shape during the welding and processing process, and improving the subsequent processing accuracy.

[0030] A turning frame 2 is composed of a fixed side and a turning side. The fixed side is provided with a lifting and clamping mechanism, and the turning side is provided with a lifting, clamping and turning mechanism. When the positioner is waiting for a workpiece, the fixed side lifting mechanism 4 rises to the uppermost end of the positioner, and the clamping jaw 10 moves to the maximum opening state. The turning side lifting mechanism moves to the lowest point, and the clamping jaw 10 also moves to the maximum opening state.

[0031] After a workpiece is installed in the positioner, the default initial state of the H-beam is that the web is horizontal. The fixed side clamping mechanism 5 is first centered and clamped, and then lowered. After it is lowered into place, the clamping jaws 10 are released and moved to the maximum open state. The welding workstation set up next to the positioner performs welding on the A side of the H-beam. After the welding of the A side is completed, a manual flip command can be issued on the human-machine operation interface to automatically and continuously perform the following flipping actions:

[0032] A: The flip side lifting mechanism 6 rises, so that the upper edge of the flip side lifting mechanism is flush with the upper edge of the fixed side lifting mechanism 4, and then the flip side clamping frame 7 moves to clamp the flanges on both sides of the H-beam;

[0033] B: The fixed side lifting mechanism 4 moves to the lowest position, and the flip side clamps the wing plate and completes a 90° flip under the drive of the flip mechanism. At this time, the H-beam posture is that the web is vertical;

[0034] C: The fixed side lifting mechanism 4 is lifted upward to catch the lower wing surface of the H-beam, and then the fixed side clamping mechanism 5 clamps the H-beam;

[0035] D: After the flip side lifting mechanism 6 moves to the lowest point and the clamping mechanism is loosened to the maximum open state, the flip mechanism flips 180° in the reverse direction without load. After flipping into place, the lifting mechanism rises. After jacking into place, the flip side clamping frame 7 clamps the H-shaped steel wing plate again;

[0036] E: The clamping mechanism 5 on the fixed side is released, the lifting mechanism drops to the lowest point, the flange is clamped on the flip side and the flange is flipped 90 degrees again under the drive of the flip mechanism. At this time, the H-beam is in a horizontal web position.

[0037] F: The fixed side lifting mechanism 4 rises to be flush with the upper edge of the flip side, and the flip side clamp 10 is released and moves downward to the lowest point. At this time, the B side of the H-beam faces upward, and the robot welding workstation can complete the B side welding at this time;

[0038] The distance of each movement needs to be calculated based on the cross-sectional dimensions of the H-beam. The above flipping action can be completed continuously and automatically, or each individual jog operation can be performed.

[0039] A spring No. 1 is arranged between the detection slot 12 and the detection rod 13, and the detection rod 13 can be reset by the spring No. 1. The top of the clamping jaw 10 is arranged as an inclined surface, and the end of the detection rod 13 close to the hollow plate 16 is arranged as an arc surface.

[0040] A second spring is arranged between the support rod 15 and the hollow plate 16. The hollow plate 16 can be driven to reset by the second spring. A third spring is arranged between the hollow plate 16 and the limiting plate 17. One end of the third spring is arranged on the inner wall of the hollow plate 16, and the other end is arranged on the top of the limiting plate 17. The limiting plate 17 can be driven to reset by the third spring. The bottom of the limiting plate 17 is set as an inclined surface. The stability of the welding workpiece during the welding process can be ensured through fixed flipping, making the welding angle and position more accurate.

[0041] During the operation of this embodiment: After placing the heavy box girder on the top of the flipping frame 2, the displacement device 9 operates to drive the clamping jaws 10 to move towards the heavy box girder. The movement of the clamping jaws 10 towards the heavy box girder drives the detection rod 13 to move. The movement of the detection rod 13 drives the detection plate 14 to move. The detection plate 14 moves and contacts the heavy box girder and exerts extrusion on the heavy box girder. At the same time, the detection plate 14 moves towards the support rod 15 under the reaction force of the heavy box girder being extruded. The movement of the detection plate 14 towards the support rod 15 drives the detection rod 13 to move. The movement of the detection rod 13 extrudes the first spring. The first spring deforms and stores energy under the extrusion of the detection rod 13. At the same time, the detection rod 13 moves towards the support rod 15 and contacts the inclined surface on the top of the hollow plate 16 and exerts extrusion on the hollow plate 16. The hollow plate 16 moves downward under the extrusion of the detection rod 13. The downward movement of the hollow plate 16 extrudes the second spring. The second spring deforms and stores energy under the extrusion of the hollow plate 16. At the same time, the downward movement of the hollow plate 16 drives the limiting plate 17 to move downward. The downward movement of the limiting plate 17 drives it to contact the inner wall of the limiting groove 11 and limits the hollow plate 16. The hollow plate 16 being limited by the limiting plate 17 makes the support rod 15 unable to continue moving towards the heavy box girder. The support rod 15 being unable to continue moving towards the heavy box girder makes the clamping jaws 10 unable to continue moving. The clamping jaws 10 being unable to continue moving prevents the clamping jaws 10 from excessively clamping the heavy box girder.

[0042] Please refer to Figures 1-9, on the basis of the above embodiments, in another embodiment of the present invention, a protection device for preventing the heavy box girder from slipping is provided on the inner wall of the flipping side clamping frame 7, and a detection device is provided on the inner wall of the flipping side clamping frame 7. The protection device includes a load-bearing plate 181, a load-bearing rod 182, a linkage plate 183, a load-bearing disc 185, and an L-shaped rod 186. The load-bearing plate 181 is fixedly installed on the inner wall of the flipping side clamping frame 7. The load-bearing rod 182 fixedly penetrates the upper and lower walls of the load-bearing plate 181. The linkage plate 183 is fixedly installed on the circumferential surface of the load-bearing rod 182. The load-bearing disc 185 is fixedly installed at the bottom of the load-bearing rod 182. The L-shaped rod 186 is fixedly installed on the circumferential surface of the load-bearing rod 182. Through auxiliary fixation, it can effectively prevent the heavy box girder from tilting or shaking due to its own weight or external forces during the welding process. When the heavy box girder loosens, increasing the clamping force can reduce the safety hazards caused by the slipping of the heavy box girder and prevent accidents from occurring, thereby protecting the safety of the operators.

[0043] A load-bearing spring 184 is provided between the load-bearing plate 181 and the load-bearing rod 182. Through the load-bearing spring 184, the load-bearing rod 182 can be driven to reset. A square plate 187 is fixedly installed at the top of the load-bearing rod 182. The linkage plate 183 contacts the hollow plate 16.

[0044] The detection device includes a detection frame 191, a detection plate 192, a detection rod 193, a protection frame 194, a protection plate 195, a protection rod 196, a button 197, and a protection hole 198. The detection frame 191 is fixedly installed on the top of the load-bearing plate 181. The detection plate 192 is slidably installed on the inner wall of the detection frame 191. The detection rod 193 is fixedly installed on the top of the detection plate 192. The protection frame 194 is fixedly installed on the inner wall of the flipping side clamping frame 7. The protection plate 195 is slidably installed on the inner wall of the protection frame 194. The protection rod 196 is fixedly installed on the front side of the protection plate 195. The button 197 is fixedly installed on the inner wall of the flipping side clamping frame 7. The protection hole 198 is opened on the inner wall of the flipping side clamping frame 7. By detecting that the heavy box girder is stably clamped before pressing the button 197 for flipping operation, the risk of accidental slipping or loosening of the workpiece due to unstable clamping can be effectively reduced, further ensuring the safety of the operators.

[0045] A hose is provided between the detection frame 191 and the protection frame 194. A fourth spring is provided between the detection frame 191 and the detection plate 192. One end of the fourth spring is arranged on the inner wall of the detection frame 191, and the other end is arranged at the bottom of the detection plate 192. Through the fourth spring, the detection plate 192 can be driven to reset. The button 197 is electrically connected to the flipping assembly 3.

[0046] The detection frame 191 is internally provided with liquid, the protection frame 194 is internally provided with liquid, and a rubber ring is provided between the protection rod 196 and the protection frame 194. Through the rubber ring, the sealing performance between the protection rod 196 and the protection frame 194 can be enhanced. A groove is provided on the circumferential surface of the button 197.

[0047] During the operation of this embodiment: The detection rod 13 moves towards the support rod 15 and contacts the inclined surface at the top of the hollow plate 16 and squeezes the hollow plate 16. The hollow plate 16 moves downward under the extrusion of the detection rod 13. The hollow plate 16 moves downward and contacts the linkage plate 183 and squeezes the linkage plate 183. The linkage plate 183 moves downward under the extrusion of the hollow plate 16. The downward movement of the linkage plate 183 drives the load-bearing rod 182 to move downward. The downward movement of the load-bearing rod 182 pulls the load-bearing spring 184. The load-bearing spring 184 deforms and stores energy under the pull of the load-bearing rod 182. At the same time, the downward movement of the load-bearing rod 182 drives the L-shaped rod 186 to move downward to assist in fixing the top of the heavy box girder. If the heavy box girder slips during the flipping process, it will squeeze the L-shaped rod 186. The L-shaped rod 186 moves upward under the extrusion of the heavy box girder. The upward movement of the L-shaped rod 186 drives the linkage plate 183 to move. The upward movement of the linkage plate 183 squeezes the hollow plate 16. The hollow plate 16 squeezes the detection rod 13 under the extrusion of the linkage plate 183. The detection rod 13 moves away from the support rod 15 under the extrusion of the hollow plate 16. The movement of the detection rod 13 away from the support rod 15 drives the detection plate 14 to move to further clamp the heavy box girder.

[0048] The downward movement of the load-bearing rod 182 drives the L-shaped rod 186 to move downward. The downward movement of the L-shaped rod 186 contacts the detection rod 193 and squeezes the detection rod 193. The detection rod 193 moves downward under the extrusion of the L-shaped rod 186. The downward movement of the detection rod 193 drives the detection plate 192 to move downward. The downward movement of the detection plate 192 squeezes the liquid inside the detection frame 191. The liquid inside the detection frame 191 enters the inside of the protection frame 194 through the hose under the extrusion of the detection plate 192. The liquid entering the inside of the protection frame 194 squeezes the protection plate 195. The protection plate 195 moves away from the load-bearing plate 185 under the extrusion of the liquid entering the inside of the protection frame 194. The movement of the protection plate 195 away from the load-bearing plate 185 drives the protection rod 196 to move. The protection rod 196 moves away from the contact with the groove and releases the limit on the button 197. After the limit on the button 197 is released, manually press the button 197 to drive the flipping assembly 3 to perform the flipping operation.

[0049] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and deformations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A turning and positioning machine for welding heavy box girders, comprising a guide rail (1), characterized in that: It also includes a clamping device; Among them, a turning frame (2) is slidably installed on the top of the guide rail (1). A turning assembly (3) is arranged on the left side of the turning frame (2). A fixed-side jacking mechanism (4) is arranged on the inner wall of the turning frame (2). A fixed-side clamping mechanism (5) is arranged on the top of the fixed-side jacking mechanism (4). A turning-side jacking mechanism (6) is arranged on the inner wall of the turning frame (2). A turning-side clamping frame (7) is arranged on the top of the turning-side jacking mechanism (6); Among them, the clamping device includes a fixed rod (8), a displacement device (9), a clamping jaw (10), a limiting groove (11), a detection groove (12), a detection rod (13), a detection plate (14), a support rod (15), a hollow plate (16), a limiting plate (17) and a support hole (20). The fixed rod (8) fixedly penetrates the inner and outer walls of the turning-side clamping frame (7). The displacement device (9) is slidably installed on the circumferential surface of the fixed rod (8). The clamping jaw (10) is fixedly installed on the top of the displacement device (9). The limiting groove (11) is opened on the left side of the turning-side clamping frame (7). The detection groove (12) is opened on the surface of the clamping jaw (10). The detection rod (13) fixedly penetrates the front and rear walls of the clamping jaw (10). The detection plate (14) is fixedly installed on the rear side of the detection rod (13). The support hole (20) is opened on the left side wall of the clamping jaw (10). The support rod (15) is fixedly installed on the inner wall of the support hole (20). The hollow plate (16) is slidably installed on the circumferential surface of the support rod (15). The limiting plate (17) is slidably installed on the inner wall of the hollow plate (16); Among them, a protection device for preventing the heavy box girder from slipping is arranged on the inner wall of the turning-side clamping frame (7), and a detection device is arranged on the inner wall of the turning-side clamping frame (7); A first spring is arranged between the detection groove (12) and the detection rod (13). The top of the clamping jaw (10) is set as an inclined surface. One end of the detection rod (13) close to the hollow plate (16) is set as an arc surface; A second spring is arranged between the support rod (15) and the hollow plate (16). A third spring is arranged between the hollow plate (16) and the limiting plate (17). The bottom of the limiting plate (17) is set as an inclined surface.

2. The turnover positioner for welding heavy box girders according to claim 1, characterized in that: The protection device includes a load-bearing plate (181), a load-bearing rod (182), a linkage plate (183), a load-bearing disc (185) and an L-shaped rod (186). The load-bearing plate (181) is fixedly installed on the inner wall of the turning-side clamping frame (7). The load-bearing rod (182) fixedly penetrates the upper and lower walls of the load-bearing plate (181). The linkage plate (183) is fixedly installed on the circumferential surface of the load-bearing rod (182). The load-bearing disc (185) is fixedly installed on the bottom of the load-bearing rod (182). The L-shaped rod (186) is fixedly installed on the circumferential surface of the load-bearing rod (182).

3. A turnover positioner for welding heavy box girders according to claim 2, wherein: A load-bearing spring (184) is arranged between the load-bearing plate (181) and the load-bearing rod (182). A square plate (187) is fixedly installed at the top of the load-bearing rod (182). The linkage plate (183) is in contact with the hollow plate (16).

4. A turning and positioning machine for welding heavy box girders according to claim 3, characterized in that: The detection device includes a detection frame (191), a detection plate (192), a detection rod (193), a protection frame (194), a protection plate (195), a protection rod (196), a button (197), and a protection hole (198). The detection frame (191) is fixedly installed on the top of the load-bearing plate (181). The detection plate (192) is slidably installed on the inner wall of the detection frame (191). The detection rod (193) is fixedly installed on the top of the detection plate (192). The protection frame (194) is fixedly installed on the inner wall of the flipping-side clamping frame (7). The protection plate (195) is slidably installed on the inner wall of the protection frame (194). The protection rod (196) is fixedly installed on the front side of the protection plate (195). The button (197) is fixedly installed on the inner wall of the flipping-side clamping frame (7). The protection hole (198) is opened on the inner wall of the flipping-side clamping frame (7).

5. The turnover positioner for welding heavy box girders according to claim 4, characterized in that: A hose is provided between the detection frame (191) and the protection frame (194). A fourth spring is provided between the detection frame (191) and the detection plate (192). The button (197) is electrically connected to the flipping assembly (3).

6. A turning and positioning machine for welding heavy box girders according to claim 5, characterized in that: Liquid is provided inside the detection frame (191). Liquid is provided inside the protection frame (194). A rubber ring is provided between the protection rod (196) and the protection frame (194). A groove is provided on the circumferential surface of the button (197).

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