A mine car body welding positioner

Abstract

A mine car body welding positioner comprises a frame, a rotating inner support device, an outer clamping device and a rotating reduction motor, the rotating inner support device is arranged along the front and back directions and is rotatably installed on the frame, the mine car body is covered outside the middle part of the rotating inner support device, the outer clamping device is installed on the rotating inner support device and clamps the outside of the mine car body, and the rotating reduction motor is fixedly installed on the frame and drives the rotating inner support device to rotate. The mine car body is reliably fixed on the rotating inner support device in the mode of inner support and outer clamping, all postures required for the mine car body welding can be obtained through rotation, the whole welding operation is completed through one-time clamping of the mine car body, the labor intensity of workers is reduced, the posture adjustment of the mine car body is convenient and fast, the mine car body welding operation time can be greatly shortened, and the production efficiency of the mine car body is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mine car production and processing, in particular to a mine car body welding positioner. BACKGROUND

[0002] The mine car body is mainly composed of side plates, end plates, flat steel and angle steel at the mouth of the car body, and each component is welded to form a whole. In order to ensure the welding quality and efficiency and reduce the working intensity of workers, the posture of the mine car body needs to be adjusted according to the welding position during welding. At present, the posture adjustment of the car body is mainly manual operation, that is, the mine car body is first lifted, then the posture is adjusted, and then it is placed and arranged. Such operation not only has high labor intensity of workers, but also has long time and low production efficiency. SUMMARY

[0003] The purpose of the present application is to provide a mine car body welding positioner. The mine car compartment is reliably fixed on the rotating inner support device by the inner support and outer clamping mode, all postures required for mine car body welding can be obtained through rotation, the mine car compartment is once clamped and installed to complete all welding operations, the labor intensity of workers is reduced, the posture adjustment of the mine car compartment is convenient and fast, the mine car compartment welding operation time can be greatly shortened, and the production efficiency of the mine car compartment is improved.

[0004] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0005] A mine car body welding positioner, comprising a rack, a rotating inner support device, an external clamping device and a rotating speed reducer motor, the rotating inner support device is arranged in the front-rear direction and is rotatably installed on the rack, the mine car body is covered on the outer side of the middle part of the rotating inner support device, the external clamping device is installed on the rotating inner support device and clamps the outside of the mine car compartment, and the rotating speed reducer motor is fixedly installed on the rack and drives the rotating inner support device to rotate.

[0006] The rack comprises a base, the base is horizontally arranged in the front-rear direction, the upper part of the front end of the base and the upper part of the rear end of the base are fixedly provided with support plates, the support plates are vertically arranged in the left-right direction, the rotating speed reducer motor is fixedly installed on the front side of the upper side of the front support plate, and the power shaft of the rotating speed reducer motor is horizontally arranged in the front-rear direction and located at the rear side.

[0007] The rotating inner support device comprises two end plates, a support beam, a fixed support frame and two swing support frames. The two end plates are arranged in front of and behind the two support plates in a spaced manner. The end plates are parallel to the support plates. The support beam is arranged horizontally between the two end plates in the front-rear direction and above the base. The front end of the support beam is fixedly connected to the lower middle part of the rear side of the front end plate. The rear end of the support beam is fixedly connected to the lower middle part of the front side of the rear end plate. The upper surface of the support beam is fixedly connected with two vertical columns arranged in a spaced and symmetrical manner. The fixed support frame is fixedly installed on the top of the two vertical columns in the front-rear direction. The two swing support frames are the same in structure and are symmetrically connected to the two sides of the fixed support frame. The upper middle part of the support beam is provided with a vertical push-pull mechanism for driving the two swing support frames to swing left and right. The upper middle part of the front side of the front end plate and the upper middle part of the rear side of the rear end plate are fixedly connected with a transmission shaft through a flange structure. The rear transmission shaft is rotatably installed on the upper side of the rear support plate through a bearing. The front end of the front transmission shaft is coaxially connected with the rear end of the power shaft of the rotating speed reducer through a shaft coupling.

[0008] The fixed support frame is an arch-shaped frame which is permeable in the front-rear direction and open at the lower side. The fixed support frame comprises four first sector plates arranged in a spaced manner in the front-rear direction. The planes of the first sector plates are arranged vertically in the left-right direction. The open side of the first sector plate faces downward. The middle parts of the four first sector plates are fixedly connected through a square cross beam arranged horizontally in the front-rear direction. The left end and the right end of the four first sector plates are fixedly connected through a circular cross beam arranged horizontally in the front-rear direction. The circular cross beam penetrates the four first sector plates. The second first sector plate arranged from front to back is arranged directly above the front vertical column and its left and right side parts are fixedly connected to the front vertical column through inclined support plates. The third first sector plate is arranged directly above the rear vertical column and its left and right side parts are fixedly connected to the rear vertical column through inclined support plates.

[0009] The swing support frame is an arc-shaped frame which is permeable in the front-rear direction and open at the lower side. The right swing support frame comprises four second sector plates arranged in a spaced manner in the front-rear direction. The second sector plates are parallel to the first sector plates. The open side of the second sector plate faces downward. The right end of the four second sector plates is fixedly connected through a long strip plate arranged in the front-rear direction. The right circular cross beam penetrates the left end of the four second sector plates and is rotatably connected. A reinforcing plate is fixedly connected between the two front second sector plates and between the two rear second sector plates. The two middle second sector plates are located between the two middle first sector plates. The frontmost second sector plate is located between the two front first sector plates and close to the first first sector plate. The rearmost second sector plate is located between the two rear first sector plates and close to the fourth first sector plate.

[0010] The vertical pushing and pulling mechanism comprises a vertical hydraulic oil cylinder and a horizontal driving rod, the upper surface middle part of the support cross beam is fixedly connected with a hinged support between the two vertical columns, the cylinder bottom of the vertical hydraulic oil cylinder is hingedly connected to the hinged support through a first pin shaft, the piston rod of the vertical hydraulic oil cylinder extends upward, the horizontal driving rod is horizontally arranged along the left-right direction, the upper end of the piston rod of the vertical hydraulic oil cylinder is hingedly connected to the middle part of the horizontal driving rod through a second pin shaft, the two ends of the horizontal driving rod are both hingedly connected with a swing connecting rod arranged along the left-right direction through a third pin shaft, the left end of the left swing connecting rod is arranged between the middle two second fan-shaped plates on the left side, the right end of the right swing connecting rod is arranged between the middle two second fan-shaped plates on the right side, the left end of the left swing connecting rod and the middle two second fan-shaped plates on the left side and the right end of the right swing connecting rod and the middle two second fan-shaped plates on the right side are all hingedly connected through a fourth pin shaft, and the first pin shaft, the second pin shaft, the third pin shaft and the fourth pin shaft are all horizontally arranged along the front-rear direction.

[0011] The external clamping device comprises two groups of clamping assemblies which are the same in structure and symmetrically arranged left and right, the clamping assembly on the right side comprises two clamping driving mechanisms and a clamping cross beam, the two clamping driving mechanisms are the same in structure and symmetrically arranged front and back, the clamping driving mechanism on the front side comprises a clamping hydraulic oil cylinder and a V-shaped swing arm, the clamping hydraulic oil cylinder is arranged obliquely on the front side of the end plate on the front side, the cylinder bottom of the clamping hydraulic oil cylinder is hingedly connected to the middle part of the lower side of the front side of the end plate on the front side through a fifth pin shaft, the V-shaped swing arm is arranged on the front side of the end plate on the front side and parallel to the end plate, the V-shaped swing arm is hingedly connected to the upper right part of the front side of the end plate on the front side through a sixth pin shaft at the corner of the V-shaped swing arm, the opening side of the V-shaped swing arm is arranged toward the right lower side, the lower arm of the V-shaped swing arm is arranged obliquely with the higher left and the lower right, the upper arm of the V-shaped swing arm is horizontally arranged along the left-right direction, the piston rod of the clamping hydraulic oil cylinder extends rightward and upward, the right end of the piston rod of the clamping hydraulic oil cylinder is hingedly connected to the lower end of the lower arm of the V-shaped swing arm through a seventh pin shaft, the right end of the upper arm of the V-shaped swing arm is vertically bent and integrally formed with a folding arm, the clamping cross beam is horizontally arranged along the front-rear direction and located on the right side of the swing support frame on the right side, the right side of the front end of the clamping cross beam is fixedly connected with the folding arm on the front side, the right side of the rear end of the clamping cross beam is fixedly connected with the folding arm on the rear side, and the middle part of the left side of the clamping cross beam is hingedly connected with two clamping blocks which are arranged front and back.

[0012] The present application has outstanding substantial features and significant progress compared with the prior art. Specifically, the working principle of the present application is as follows: initially, the piston rod of the vertical hydraulic cylinder is in the extended state, the swing connecting rod on the left side is in the left-low and right-high inclined state, the swing connecting rod on the right side is in the left-high and right-low inclined state, both swing support frames are close to the middle, and the piston rod of the clamping hydraulic cylinder is in the retracted state, the two clamping cross beams are in the outward opening state, the preliminarily welded and assembled mine car body is supported on the top of the fixed support frame through the hoisting device, the upper side edges of the four first sector plates are in shape adaptation and top pressure contact with the inner bottom surface of the mine car body, then the piston rod of the vertical hydraulic cylinder is controlled to be retracted downward, the piston rod of the vertical hydraulic cylinder drives the horizontal drive rod to move downward, the horizontal drive rod drives the two swing connecting rods to move downward and swing to the horizontal state at the same time, the two swing connecting rods push the two swing support frames to swing outward at the same time, the outer circles of the four second sector plates are supported on the inner wall of the mine car body, at the same time, the piston rods of the clamping hydraulic cylinders are controlled to extend outward at the same time, the corresponding V-shaped swing arms are pushed to rotate, the two V-shaped swing arms on the left side rotate clockwise, the two V-shaped swing arms on the right side rotate counterclockwise, thereby driving the two clamping cross beams to close to the middle at the same time, the two clamping blocks on the left side and the two clamping blocks on the right side are clamped on the outer wall of the mine car body from the left side and the right side respectively, in this way, the mine car body can be reliably fixed on the rotary inner support device by the inward supporting and outward clamping mode, and the deformation of the mine car body during the welding process can be reduced, then the rotary speed reducer is controlled to start, the power shaft of the rotary speed reducer drives the transmission shaft on the front side to rotate through the shaft coupling coaxial transmission, thereby driving the rotary inner support device to rotate, the rotary inner support device drives the mine car body to rotate, the power shaft of the rotary speed reducer can rotate forward and reverse, and can stop and brake at any position, thereby making the mine car body rotate to any position and keep stationary, adjusting the posture of the mine car body to the appropriate position for welding operation, in this way, all postures required for the mine car body welding can be obtained, when the welding is completed, the mine car body is turned to the initial position, the piston rods of the clamping hydraulic cylinders are controlled to retract to the initial state at the same time, the two V-shaped swing arms on the left side rotate counterclockwise, the two V-shaped swing arms on the right side rotate clockwise, thereby driving the two clamping cross beams to open outward at the same time, the four clamping blocks are separated from the outer wall of the mine car body, at the same time, the piston rod of the vertical hydraulic cylinder is controlled to extend upward to the initial state, the piston rod of the vertical hydraulic cylinder drives the horizontal drive rod to move upward, the horizontal drive rod drives the two swing connecting rods to move upward at the same time, the two swing connecting rods pull the two swing support frames to swing inward at the same time, the two swing support frames close to the middle, the outer circles of the four second sector plates are separated from the inner wall of the mine car body, in this way, the welded mine car body can be lifted away, and the next mine car body to be welded can be placed, the above process is repeated to complete the posture adjustment and welding operation of the next mine car body, and the mine car body is clamped once to complete all welding operations.The labor intensity of workers is reduced, the posture adjustment of the mine car compartment is convenient and fast, the mine car compartment welding operation time can be greatly shortened, and the mine car compartment production efficiency is improved.

[0013] The mine car compartment is reliably fixed in a way of inner support and outer clamping, all postures required for mine car compartment welding can be obtained through rotation, all welding operations are completed by one-time clamping of the mine car compartment, the labor intensity of workers is reduced, the posture adjustment of the mine car compartment is convenient and fast, the mine car compartment welding operation time can be greatly shortened, and the mine car compartment production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0015] Figure 2 It is a schematic diagram of the structure of the rack of the present application.

[0016] Figure 3 It is a schematic diagram of the structure of the rotating inner support device of the present application.

[0017] Figure 4 It is a schematic diagram of the rotating inner support device and the outer clamping device fixing the mine car compartment of the present application. DETAILED DESCRIPTION

[0018] The embodiments of the present application are further described below with reference to the accompanying drawings.

[0019] As shown in the drawings, Figures 1-4 A mine car compartment welding positioner includes a rack, a rotating inner support device, an outer clamping device and a rotating speed reduction motor 1, the rotating inner support device is arranged in the front-rear direction and is rotatably installed on the rack, the mine car compartment is covered outside the middle part of the rotating inner support device, the outer clamping device is installed on the rotating inner support device and clamps the outside of the mine car compartment, and the rotating speed reduction motor 1 is fixedly installed on the rack and drives the rotating inner support device to rotate.

[0020] The rack includes a base 2, the base 2 is arranged horizontally in the front-rear direction, the upper part of the front end and the upper part of the rear end of the base 2 are fixedly provided with support plates 3, the support plates 3 are arranged vertically in the left-right direction, the rotating speed reduction motor 1 is fixedly installed on the front side of the upper side of the middle part of the support plate 3 on the front side, and the power shaft of the rotating speed reduction motor 1 is arranged horizontally in the front-rear direction and located on the rear side.

[0021] The rotating inner support device comprises two end plates 4, a support beam 5, a fixed support frame and two swing support frames. The two end plates 4 are arranged in front of and behind the two support plates 3 in parallel with the support plates 3. The support beam 5 is arranged horizontally in front of and behind the two end plates 4 and above the base 2. The front end of the support beam 5 is fixedly connected to the lower middle part of the rear side of the front end plate 4. The rear end of the support beam 5 is fixedly connected to the lower middle part of the front side of the rear end plate 4. The upper surface of the support beam 5 is fixedly connected with two vertical columns 6 arranged in front of and behind and symmetrically. The fixed support frame is fixedly installed on the top of the two vertical columns 6 in front of and behind. The two swing support frames are symmetrically connected to the two sides of the fixed support frame. The upper middle part of the support beam 5 is provided with a vertical push-pull mechanism for driving the two swing support frames to swing left and right. The upper middle part of the front side of the front end plate 4 and the upper middle part of the rear side of the rear end plate 4 are fixedly connected with a transmission shaft 8 through a flange structure 7. The rear transmission shaft 8 is rotatably installed on the upper side of the rear support plate 3 through a bearing. The front end of the front transmission shaft 8 is coaxially and drivingly connected with the rear end of the power shaft of the rotating speed reducer motor 1 through a shaft coupling.

[0022] The fixed support frame is an arch-shaped frame which is permeable in front of and behind and open at the lower side. The fixed support frame comprises four first fan-shaped plates 9 arranged in front of and behind. The plane of the first fan-shaped plate 9 is arranged vertically in left and right directions. The open side of the first fan-shaped plate 9 faces downward. The middle parts of the four first fan-shaped plates 9 are fixedly connected through a square cross beam 10 arranged horizontally in front of and behind. The left end and the right end of the four first fan-shaped plates 9 are fixedly connected through a circular cross beam 11 arranged horizontally in front of and behind. The circular cross beam 11 penetrates the four first fan-shaped plates 9. The second first fan-shaped plate 9 arranged from front to back is arranged directly above the front vertical column 6 and its left side and right side are fixedly connected to the front vertical column 6 through inclined support plates 12. The third first fan-shaped plate 9 is arranged directly above the rear vertical column 6 and its left side and right side are fixedly connected to the rear vertical column 6 through inclined support plates 12.

[0023] The swing support frame is an arc-shaped frame which is permeable from front to back and has an open lower side. The swing support frame on the right side comprises four second sector-shaped plates 13 which are arranged at intervals from front to back. The second sector-shaped plates 13 are parallel to the first sector-shaped plates 9, and the open sides of the second sector-shaped plates 13 face downward. The right ends of the four second sector-shaped plates 13 are fixedly connected by a long strip plate 14 arranged in the front-to-back direction. The circular horizontal rod 11 on the right side penetrates the left ends of the four second sector-shaped plates 13 and is rotationally connected. A reinforcing plate 15 is fixedly connected between the two second sector-shaped plates 13 on the front side and between the two second sector-shaped plates 13 on the back side. The two middle second sector-shaped plates 13 are located between the two middle first sector-shaped plates 9. The frontmost second sector-shaped plate 13 is located between the two first sector-shaped plates 9 on the front side and is close to the first first sector-shaped plate 9. The rearmost second sector-shaped plate 13 is located between the two first sector-shaped plates 9 on the back side and is close to the fourth first sector-shaped plate 9.

[0024] The vertical push-pull mechanism comprises a vertical hydraulic oil cylinder 16 and a horizontal drive rod 17. The upper surface of the support cross beam 5 is fixedly connected with a hinged support 18 located between the two vertical columns 6. The bottom of the cylinder body of the vertical hydraulic oil cylinder 16 is hingedly connected to the hinged support 18 through a first pin shaft. The piston rod of the vertical hydraulic oil cylinder 16 extends upward. The horizontal drive rod 17 is arranged horizontally in the left-right direction. The upper end of the piston rod of the vertical hydraulic oil cylinder 16 is hingedly connected to the middle part of the horizontal drive rod 17 through a second pin shaft. Both ends of the horizontal drive rod 17 are hingedly connected to a swing link 19 arranged in the left-right direction through a third pin shaft. The left end of the swing link 19 on the left side is arranged between the two middle second sector-shaped plates 13 on the left side. The right end of the swing link 19 on the right side is arranged between the two middle second sector-shaped plates 13 on the right side. The left end of the swing link 19 on the left side and the right end of the swing link 19 on the right side are hingedly connected to the two middle second sector-shaped plates 13 on the left side and the two middle second sector-shaped plates 13 on the right side through a fourth pin shaft. The first pin shaft, the second pin shaft, the third pin shaft, and the fourth pin shaft are all arranged horizontally in the front-to-back direction.

[0025] The external clamping device comprises two groups of clamping assemblies which are identical in structure and symmetrically arranged left and right. The clamping assembly on the right side comprises two clamping driving mechanisms which are identical in structure and symmetrically arranged front and back. The clamping driving mechanism on the front side comprises a clamping hydraulic oil cylinder 21 and a V-shaped swing arm 22. The clamping hydraulic oil cylinder 21 is arranged obliquely on the front side of the end plate 4 on the front side with the left side being lower than the right side. The cylinder body bottom of the clamping hydraulic oil cylinder 21 is hingedly connected to the front side of the end plate 4 on the front side through a fifth pin shaft. The V-shaped swing arm 22 is arranged on the front side of the end plate 4 in parallel with the end plate 4. The V-shaped swing arm 22 is hingedly connected to the upper right part of the front side of the end plate 4 through a sixth pin shaft at the corner of the V-shaped swing arm 22. The opening side of the V-shaped swing arm 22 is arranged towards the right lower side. The lower arm of the V-shaped swing arm 22 is arranged obliquely with the left side being higher than the right side. The upper arm of the V-shaped swing arm 22 is arranged horizontally along the left-right direction. The piston rod of the clamping hydraulic oil cylinder 21 extends to the right upper side. The piston rod of the clamping hydraulic oil cylinder 21 is hingedly connected to the lower end of the lower arm of the V-shaped swing arm 22 through a seventh pin shaft at the right end. The upper arm of the V-shaped swing arm 22 is integrally formed with a folding arm 23 at the right end. The clamping cross beam 20 is arranged horizontally along the front-back direction and located on the right side of the swing support frame on the right side. The front end of the clamping cross beam 20 is fixedly connected to the right side of the folding arm 23 on the front side. The rear end of the clamping cross beam 20 is fixedly connected to the right side of the folding arm 23 on the rear side. Two clamping blocks 24 are hingedly connected to the middle part of the left side of the clamping cross beam 20. The hinging shafts of the fifth pin shaft, the sixth pin shaft, the seventh pin shaft and the clamping block 24 are all arranged horizontally along the front-back direction.

[0026] The working principle of the present application is as follows: initially, the piston rod of the vertical hydraulic cylinder 16 is in an extended state, the swing connecting rod 19 on the left side is in a left-low and right-high inclined state, the swing connecting rod 19 on the right side is in a left-high and right-low inclined state, both swing support frames are close to the middle, and the piston rod of the clamping hydraulic cylinder 21 is in a retracted state, the two clamping cross beams 20 are in a state of opening away from each other, the preliminarily welded and assembled mine car body 25 is supported upside down on the top of the fixed support frame through the hoisting device, the upper side edges of the four first sector plates 9 are in shape adaptation and top pressure contact with the inner bottom surface of the mine car body 25, then the piston rod of the vertical hydraulic cylinder 16 is controlled to retract downward, the piston rod of the vertical hydraulic cylinder 16 drives the horizontal drive rod 17 to move downward, the horizontal drive rod 17 drives the two swing connecting rods 19 to move downward and swing to a horizontal state at the same time, the two swing connecting rods 19 push the two swing support frames to swing outward at the same time, the outer circles of the four second sector plates 13 are supported on the inner walls of the mine car body 25, at the same time, the piston rods of the clamping hydraulic cylinders 21 are controlled to extend outward at the same time, the piston rods of the clamping hydraulic cylinders 21 drive the corresponding V-shaped swing arms 22 to rotate respectively, the two V-shaped swing arms 22 on the left side rotate clockwise, the two V-shaped swing arms 22 on the right side rotate counterclockwise, thereby driving the two clamping cross beams 20 to close to each other in the middle at the same time, the two clamping blocks 24 on the left side and the two clamping blocks 24 on the right side are clamped on the outer walls of the mine car body 25 from the left and right sides respectively, in this way, the mine car body 25 can be reliably fixed on the rotary inner support device in an inside supporting and outside clamping manner, and the deformation of the mine car body 25 during welding can be reduced, then the rotary reduction motor 1 is controlled to start, the power shaft of the rotary reduction motor 1 drives the transmission shaft 8 on the front side to rotate through the shaft coupling coaxial transmission, thereby driving the rotary inner support device to rotate, the rotary inner support device drives the mine car body 25 to rotate, the power shaft of the rotary reduction motor 1 can rotate forward and reverse, and can stop and brake at any position, thereby making the mine car body 25 rotate to any position and keep stationary, adjusting the posture of the mine car body 25 to a suitable position for welding operation, in this way, all postures required for mine car body welding can be obtained, after welding is completed, the mine car body 25 is rotated to the initial position, the piston rods of the clamping hydraulic cylinders 21 are controlled to retract to the initial state at the same time, the two V-shaped swing arms 22 on the left side rotate counterclockwise, the two V-shaped swing arms 22 on the right side rotate clockwise, thereby driving the two clamping cross beams 20 to open away from each other, the four clamping blocks 24 are separated from the outer walls of the mine car body 25, at the same time, the piston rod of the vertical hydraulic cylinder 16 is controlled to extend upward to the initial state, the piston rod of the vertical hydraulic cylinder 16 drives the horizontal drive rod 17 to move upward, the horizontal drive rod 17 drives the two swing connecting rods 19 to move upward at the same time, the two swing connecting rods 19 pull the two swing support frames to swing inward at the same time, the two swing support frames close to the middle, the outer circles of the four second sector plates 13 are separated from the inner walls of the mine car body 25, in this way, the welded mine car body 25 can be lifted away.And place the next to be welded mine car compartment 25, repeat the above process, complete the next mine car compartment 25 posture adjustment and welding operation, realize the mine car compartment 25 once clamping complete all welding operation, reduce the labor intensity of workers, and the mine car compartment 25 posture adjustment is convenient and fast, can greatly shorten the mine car compartment 25 welding operation time, improve the mine car compartment 25 production efficiency.

[0027] The above examples are only used to illustrate but not limit the technical solutions of the present application, although the present application is described in detail with reference to the above examples, those skilled in the art should understand that; Still can modify or equivalent replacement, without departing from the spirit and scope of the present application any modification or partial replacement, it should be covered in the scope of the claims of the present application.

Claims

1. A mine car body welding positioner characterized by: The device comprises a rack, a rotating inner support device, an external clamping device and a rotating reduction motor, the rotating inner support device is arranged along the front-rear direction and is rotatably installed on the rack, a mine car body is covered outside the middle part of the rotating inner support device, the external clamping device is installed on the rotating inner support device and clamps the outside of the mine car body, and the rotating reduction motor is fixedly installed on the rack and drives the rotating inner support device to rotate; The rotating inner support device comprises two end plates, a support beam, a fixed support frame and two swing support frames, the two end plates are arranged in the front-rear direction and are arranged between the two support plates, the end plates are parallel to the support plates, the support beam is arranged horizontally along the front-rear direction between the two end plates and is located above the rack, the front end of the support beam is fixedly connected to the lower middle part of the rear side of the front end plate, the rear end of the support beam is fixedly connected to the lower middle part of the front side of the rear end plate, the upper surface of the support beam is fixedly connected with two vertical columns arranged in the front-rear direction and symmetrically, the fixed support frame is fixedly installed on the top of the two vertical columns along the front-rear direction, the two swing support frames are the same in structure and are rotatably connected to the two sides of the fixed support frame, the middle part of the upper surface of the support beam is provided with a vertical push-pull mechanism for driving the two swing support frames to swing left and right, the upper middle part of the front side of the front end plate and the upper middle part of the rear side of the rear end plate are both fixedly connected with a transmission shaft through a flange structure, the rear transmission shaft is rotatably installed on the upper side of the rear support plate through a bearing, and the front end of the front transmission shaft is coaxially and drivingly connected with the rear end of the power shaft of the rotating reduction motor through a shaft coupling; The fixed support frame is an arch-shaped frame which is permeable in the front-rear direction and open at the lower side, the fixed support frame comprises four first sector plates arranged in the front-rear direction, the planes of the first sector plates are arranged vertically along the left-right direction, the open sides of the first sector plates face downward, the middle parts of the four first sector plates are fixedly connected through a square cross bar arranged horizontally along the front-rear direction, the left end parts and the right end parts of the four first sector plates are both fixedly connected through a circular cross bar arranged horizontally along the front-rear direction, the circular cross bar penetrates through the four first sector plates, the second first sector plate arranged from front to back is arranged directly above the front vertical column and its left end part and right end part are both fixedly connected to the front vertical column through inclined support plates, and the third first sector plate is arranged directly above the rear vertical column and its left end part and right end part are both fixedly connected to the rear vertical column through inclined support plates. The swing support frame is an arc-shaped frame that is open at the front and back and open at the bottom. The swing support frame on the right side includes four second sector plates that are spaced apart at the front and back. The second sector plates are parallel to the first sector plates and the open side of the second sector plates faces downward. The right ends of the four second sector plates are fixedly connected by a long strip plate that runs along the front and back direction. A circular crossbar on the right side passes through the left end of the four second sector plates and is rotatably connected. A reinforcing plate is fixedly connected between the two front second sector plates and between the two rear second sector plates. The two middle second sector plates are located between the two middle first sector plates. The frontmost second sector plate is located between the two front first sector plates and close to the first first sector plate. The rearmost second sector plate is located between the two rear first sector plates and close to the fourth first sector plate.

2. The mine car body welding positioner of claim 1 wherein: The vertical push-pull mechanism includes a vertical hydraulic cylinder and a horizontal drive rod. A hinged support located between two columns is fixedly connected to the middle of the upper surface of the support beam. The bottom of the cylinder body of the vertical hydraulic cylinder is hinged to the hinged support through a first pin. The piston rod of the vertical hydraulic cylinder extends upward. The horizontal drive rod is horizontally arranged in the left-right direction. The upper end of the piston rod of the vertical hydraulic cylinder is hinged to the middle of the horizontal drive rod through a second pin. Both ends of the horizontal drive rod are hinged to a swing link arranged in the left-right direction through a third pin. The left end of the left swing link is located between the two middle second sector plates on the left side, and the right end of the right swing link is located between the two middle second sector plates on the right side. The left end of the left swing link and the two middle second sector plates on the left side, as well as the right end of the right swing link and the two middle second sector plates on the right side, are all hinged through a fourth pin. The first, second, third, and fourth pins are all horizontally arranged in the front-back direction.

3. The mine car body welding positioner as defined in claim 2, wherein: The external clamping device comprises two groups of clamping assemblies which are identical in structure and symmetrically arranged left and right, the clamping assembly on the right side comprises two clamping driving mechanisms which are identical in structure and symmetrically arranged front and back, the clamping driving mechanism on the front side comprises a clamping hydraulic oil cylinder and a V-shaped swing arm, the clamping hydraulic oil cylinder is obliquely arranged on the front side of the end plate on the front side, the bottom of the cylinder body of the clamping hydraulic oil cylinder is hingedly connected to the lower middle part of the front side of the end plate on the front side through a fifth pin shaft, the V-shaped swing arm is arranged on the front side of the end plate on the front side and parallel to the end plate, the V-shaped swing arm is hingedly connected to the upper right part of the front side of the end plate on the front side through a sixth pin shaft at the corner of the V-shaped swing arm, the opening side of the V-shaped swing arm is arranged towards the right lower side, the lower arm of the V-shaped swing arm is obliquely arranged, the upper arm of the V-shaped swing arm is horizontally arranged along the left-right direction, the piston rod of the clamping hydraulic oil cylinder extends to the right upper side, the right end of the piston rod of the clamping hydraulic oil cylinder is hingedly connected to the lower end of the lower arm of the V-shaped swing arm through a seventh pin shaft, the right end of the upper arm of the V-shaped swing arm is vertically bent to form an elbow, the clamping cross beam is horizontally arranged along the front-back direction and located on the right side of the swing support frame on the right side, the right side of the front end of the clamping cross beam is fixedly connected to the elbow on the front side, the right side of the rear end of the clamping cross beam is fixedly connected to the elbow on the rear side, the middle part of the left side of the clamping cross beam is hingedly connected to two clamping blocks which are arranged in front and back, and the hinge shafts of the fifth pin shaft, the sixth pin shaft, the seventh pin shaft and the clamping blocks are all horizontally arranged along the front-back direction.

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