A head-tail frame type turnover positioner for manual welding turnover of a turret structure

Abstract

This invention discloses a head-and-tail frame type turning and positioning machine for manual welding and turning of turntable structural components. It includes a turntable structural component, column structures, crossbeams, flexible clamps, a lifting platform, and a safety rope device. The turntable structural component has column structures at both ends, connected by a crossbeam. The flexible clamps are located on the crossbeams, and the safety rope device is located on the main frame of the column structures, with the safety rope device positioned between the column structures. This invention has a rated load capacity ≥50t (workpiece only), can achieve 0~360° turning, and can be applied to turntable structural components of various crawler crane models with lengths exceeding 13 meters, widths exceeding 3.5 meters, and heights exceeding 3 meters. It solves the problem of turning and positioning during manual welding of turntable structural components, avoiding the problems of numerous turning operations, low turning efficiency, high skill requirements for workers, high labor intensity, and significant safety risks associated with existing technologies using overhead cranes for turning.

Description

Technical Field

[0001] This invention relates to the field of flipping and repositioning machines, and more particularly to a head and tail frame type flipping and repositioning machine for manual welding and flipping of turntable structural components. Background Technology

[0002] Tracked cranes are mainly used in large-scale hoisting projects such as rail transit, wind power, petrochemicals, and nuclear power. To meet the characteristics of engineering construction and safety requirements, most of the key load-bearing structural components of the tracked crane turntable are made of medium-thick high-strength steel plates welded together. Therefore, the turntable structural components are characterized by their large weight and large size.

[0003] Due to the unique structural form of the turntable component of the crawler crane product, the existing flipping and repositioning machine technology is not applicable to this workpiece. In order to ensure the completion of manual welding of all parts of the turntable component, the existing technology mainly uses the overhead crane-assisted repositioning method to flip the workpiece. The main operation steps are: hoisting the turntable component to the welding area - manual welding at the top - overhead crane flipping (1) - manual welding on the side - overhead crane flipping (2) - manual welding at the bottom - overhead crane flipping (3) - manual welding on the other side - overhead crane flipping (4), etc. Among them, four flipping is required. Without considering the waiting time of the overhead crane, the average flipping time is 30 minutes / time. The workpiece flipping process requires 2 to 3 people to coordinate.

[0004] The following problems exist in the entire flipping process: (1) The entire welding process of the turntable structure requires 4 flips to complete the welding of all welds, which is a large number of flips; (2) The manual flipping mode of the crane operator and the welder working together relies entirely on the experience and skill level of the workers. The turntable is large in size and weight, requires a large flipping space, and some workpieces need to be lifted by two cranes, resulting in low flipping efficiency; (3) Manual flipping is highly dependent on the crane, and there are few cranes on site. During the peak period of crane use, the flipping process often requires queuing for 20-45 minutes; (4) The crane operator and several welders need to work together during the flipping process. The crane operator's line of sight is limited and easily blocked by the structural parts. There are safety hazards for the welder when assisting in the flipping; (5) In addition, the flipping process may cause safety risks such as wire rope breakage, workpiece tilting, and collision. The crane-assisted displacement requires the coordination of multiple people, and the time taken for each time is too long. The deformation and rework caused by the collision of the workpiece affects the normal work efficiency.

[0005] Therefore, it is urgent to optimize and improve the flipping method of the turntable structure. Summary of the Invention

[0006] Purpose of the invention: To address the shortcomings and defects of existing technologies, this invention provides a head-and-tail frame type turning and positioning machine for manual welding and turning of turntable structural components. It has a rated load capacity of ≥50t (workpiece only) and can achieve 0~360° turning. It can be applied to turntable structural components of various crawler crane products with lengths exceeding 13 meters, widths exceeding 3.5 meters, and heights exceeding 3 meters. This invention solves the problem of turning and positioning during the manual welding process of turntable structural components, avoiding the problems of excessive turning times, low turning efficiency, high skill requirements for workers, high labor intensity, and significant safety risks associated with existing technologies using overhead cranes for turning.

[0007] Technical solution: The present invention provides a head-and-tail frame type turning and positioning machine for manual welding and turning of turntable structural components, characterized in that: it includes a turntable structural component, column structure, crossbeam, flexible clamp, lifting work platform and safety rope device; the turntable structural component has column structures at both ends, and the column structures are connected by a crossbeam; the flexible clamp is located on the crossbeam, the safety rope device is located on the main frame of the column structure, and the safety rope device is located between the column structures.

[0008] The column structure includes a linear guide rail, a column main frame, a tilting reducer, a tilting motor, a lifting drive cylinder, a wire encoder, a lifting slide plate, a tilting brake, a lifting anti-fall device, and a rotation mechanism.

[0009] The main frame of the column adopts a prefabricated gantry structure. The inner side of the gantry of the main frame of the column is equipped with a lifting slide plate. The lifting slide plate is driven by a lifting drive cylinder to move up and down along a linear guide rail. The lifting drive cylinder is equipped with a lifting hydraulic lock. The lifting slide plate is equipped with a slewing mechanism. The slewing mechanism is driven by a slewing motor to mesh with a slewing bearing to achieve slewing. The slewing motor is equipped with an encoder.

[0010] The lifting and anti-fall device adopts a pneumatic pin structure, which prevents falls by inserting two sets of pneumatic pin shafts into the evenly distributed elongated oval holes in the main frame of the column. The lifting slide plate and the crossbeam are connected by pin shafts. One end of the connection hole of the crossbeam is a round hole and the other end is an elongated oval hole. The main frame of the column is equipped with a pull-wire encoder.

[0011] The flexible clamp includes a positioning mechanism, a front centering and clamping device, a rear centering device, a rear clamping device, and a tail clamping device arranged on the crossbeam.

[0012] The front centering and clamping devices are located at six points, controlled by hydraulic cylinders and driven by gears and racks. They are symmetrically arranged along the Y-axis of the turntable structure and move along the Y-axis. The rear centering and clamping devices are located at two points, controlled by hydraulic cylinders, including a rear centering device and a rear clamping device. They are symmetrically arranged along the Y-axis of the turntable structure and move along the Y-axis and the X-axis of the track. The tail clamping devices are located at two points, controlled by hydraulic cylinders. They are symmetrically arranged along the Y-axis of the turntable structure, move along the X-axis of the track, and are height-adjusted along the Z-axis. The positioning mechanism uses two pins located at the ends of the workpiece. The rear clamping devices are connected to a servo motor and a screw jack.

[0013] The centering and clamping device includes a guide pin, a second return spring, a screw, a first return spring, a lifting block, a second hydraulic cylinder, a hinge shaft, a fixed frame, a lifting ring, a pressure head, and a centering pad.

[0014] The fixed frame has a slotted front end with a replaceable centering pad installed in the slot. The centering pad contacts the side of the workpiece base plate. The second hydraulic cylinder is a single-acting cylinder. The lifting block is guided by a guide pin, and the pressure head rotates along the hinge axis. The lifting block and the pressure head are respectively equipped with screws and connected by a return spring. The lifting block is driven by the second hydraulic cylinder to press the pressure head against the workpiece base plate. The lifting block moves under the action of the return spring. The centering and pressing device is installed through the lifting ring.

[0015] The safety rope device is connected at both ends by steel wire ropes.

[0016] The lifting platform includes a fence, a retractable pedal, a platform track, pedals, and a lifting device; the pedals are equipped with a retractable pedal, and the lifting device moves the lifting platform within the constraints of the platform track; the lifting platform is equipped with a fence.

[0017] Beneficial Effects: Compared with existing technologies, this invention has the following significant advantages: The head-and-tail frame type flipping and positioning machine of this invention can meet the clamping and flipping operations of various specifications of turntable structural components, exhibiting good versatility. It can solve the problems of long flipping time and the need for multiple personnel during the flipping of large workpieces using overhead cranes, while reducing crane occupation, improving flipping efficiency and production capacity, and reducing worker labor intensity. Equipped with safety protection devices such as a flipping brake, a pneumatic pin-type lifting anti-fall device, and a hydraulic cylinder lock, it offers strong safety. Synchronization of lifting and flipping is ensured through a pull-wire encoder and a motor encoder, while the flexible pin connection between the lifting slide and the crossbeam absorbs asynchronous deviations, resulting in good synchronization of lifting and flipping. The safety rope attachment device solves the problem of difficulty in attaching safety ropes in existing production methods, reducing the safety risks for workers working at heights. The lifting platform's footboard has a partial telescopic function, facilitating workers to approach or enter the workpiece for welding operations, replacing the existing method of workers pushing and pulling ladders back and forth, thus reducing worker labor intensity. It can achieve 0~360° flipping, meeting the welding requirements of workpieces in a boat-shaped position and improving welding quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention, including the workpiece state;

[0019] Figure 2 This is a schematic diagram of the structure of the present invention in the state without a workpiece;

[0020] Figure 3 This is a schematic diagram of the column structure of the present invention. Figure 1 ;

[0021] Figure 4 This is a schematic diagram of the column structure of the present invention. Figure 2 ;

[0022] Figure 5 This is a schematic diagram of the crossbeam and flexible clamp of the present invention;

[0023] Figure 6 This is a schematic diagram of the centering and clamping device of the present invention. Figure 1 ;

[0024] Figure 7 This is a schematic diagram of the centering and clamping device of the present invention. Figure 2 ;

[0025] Figure 8 This is a schematic diagram of the lifting operation platform of the present invention;

[0026] In the diagram, 1 is the turntable structure; 2 is the column structure; 3 is the crossbeam; 4 is the flexible clamp; 5 is the lifting platform; 6 is the safety rope device; 7 is the linear guide rail; 8 is the main frame of the column; 9 is the tilting reducer; 10 is the tilting motor; 11 is the lifting drive cylinder; 12 is the wire encoder; 13 is the lifting slide plate; 14 is the tilting brake; 15 is the lifting anti-fall device; 16 is the slewing mechanism; 17 is the pin shaft; 18 is the positioning mechanism; 19 is the front centering clamping device; 20 is the rear centering device; 21 is the rear... 22 is the tail clamping device; 23 is the gear; 24 is the first hydraulic cylinder; 25 is the rack; 26 is the track; 27 is the servo motor; 28 is the screw jack; 29 is the guide pin; 30 is the second return spring; 31 is the screw; 32 is the first return spring; 33 is the lifting block; 34 is the second hydraulic cylinder; 35 is the hinge shaft; 36 is the fixing frame; 37 is the lifting ring; 38 is the pressure head; 39 is the centering pad; 40 is the fence; 41 is the pedal telescopic part; 42 is the platform track; 43 is the pedal; 44 is the lifting device. Detailed Implementation

[0027] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] The present invention relates to a head-and-tail frame type turning and positioning machine for manual welding and turning of turntable structural components, comprising a turntable structural component 1, a column structure 2, a crossbeam 3, a flexible clamp 4, a lifting work platform 5, and a safety rope device 6; the turntable structural component 1 has column structures 2 at both ends, and the column structures 2 are connected by the crossbeam 3; the flexible clamp 4 is located on the crossbeam 3, and the safety rope device 6 is located on the main frame 8 of the column structure 2, and the safety rope device 6 is connected to the lifting work platform 5. The column structure 2 includes a linear guide rail 7, a main frame 8, a turning reducer 9, a turning motor 10, a lifting drive cylinder 11, a wire encoder 12, a lifting slide plate 13, a turning brake 14, a lifting anti-fall device 15, and a rotation mechanism 16. The main frame 8 of the column adopts a prefabricated gantry structure. A lifting slide plate 13 is provided inside the gantry of the main frame 8. The lifting slide plate 13 is driven by a lifting drive cylinder 11 to move up and down along the linear guide rail 7. The lifting drive cylinder 11 is equipped with a lifting hydraulic lock. A rotation mechanism 16 is provided on the lifting slide plate 13. The rotation mechanism 16 achieves rotation by driving a gear driven by a tilting motor 10 to mesh with a slewing bearing. The tilting motor 10 is equipped with an encoder. The lifting anti-fall device 15 adopts a pneumatic pin structure. It achieves anti-fall by inserting two sets of pneumatic pins into evenly distributed elongated holes in the main frame 8. The lifting slide plate 13 is connected to the crossbeam 3 by a pin 17. One end of the connection hole in the crossbeam 3 is a round hole, and the other end is an elongated hole. A pull-wire encoder 12 is provided on the main frame 8.

[0029] The flexible clamp 4 of the present invention includes a positioning mechanism 18, a front centering and clamping device 19, a rear centering device 20, a rear clamping device 21, and a tail clamping device 22 arranged on a crossbeam 3. The front centering and clamping devices 19 are located in six places, controlled by hydraulic cylinders 24, and driven by gears 23 and racks 25. They are symmetrically arranged in the Y-axis direction of the turntable structure 1 and move along the Y-axis. The rear centering and clamping devices are located in two places, controlled by hydraulic cylinders, including the rear centering device 20 and the rear clamping device 21. They are symmetrically arranged in the Y-axis direction of the turntable structure 1 and move along the Y-axis and the X-axis direction of the track 26. The tail clamping devices 22 are located in two places, controlled by hydraulic cylinders, symmetrically arranged in the Y-axis direction of the turntable structure 1, move along the X-axis direction of the track 26, and are height-adjusted along the Z-axis. The positioning mechanism 18 uses two pins 17 located at the ends of the workpiece. The rear clamping device 21 is connected to a servo motor 27 and a screw jack 28. The centering and clamping device includes a guide pin 29, a second return spring 30, a screw 31, a first return spring 32, a lifting block 33, a second hydraulic cylinder 34, a hinge shaft 35, a fixed frame 36, a lifting ring 37, a pressure head 38, and a centering pad 39. The front end of the fixed frame 36 has a slotted structure, and a replaceable centering pad 39 is installed in the slot, contacting the side of the workpiece base plate. The second hydraulic cylinder 34 is a single-acting cylinder. The lifting block 33 is guided by the guide pin 29, and the pressure head 38 rotates along the hinge shaft 35. The lifting block 33 and the pressure head 38 are respectively equipped with screws 31 and connected by the first return spring 32. The second hydraulic cylinder 34 drives the lifting block 33 to achieve pressure head 38 pressing against the workpiece base plate. The lifting block 33 moves under the action of the second return spring 30. The centering and clamping device is installed via the lifting ring 37. The safety rope device 6 is connected at both ends with steel wire ropes. The lifting platform 5 includes a railing 40, a pedal telescopic part 41, a platform track 42, a pedal 43, and a lifting device 44; the pedal 43 is equipped with a pedal telescopic part 41, and the lifting platform 5 can be moved within the limitation of the platform track 42 by the lifting device 44; the lifting platform 5 is equipped with a railing 40.

[0030] Example:

[0031] like Figures 1-8This embodiment of the head-and-tail frame tilting and positioning machine includes a column structure, flexible clamps, crossbeams, a safety rope device, and a lifting platform device. The column structure consists of two parts, arranged at both ends of the tilting and positioning machine and connected by the crossbeam. It comprises a main column frame, linear guide rails, a lifting slide plate, a lifting drive cylinder, a lifting anti-fall device, a tilting reducer, a tilting motor, a wire encoder, a tilting brake, and a slewing mechanism. The main column frame adopts a gantry design and is modular for easy maintenance and inspection. The lifting slide plate is installed inside the gantry of the main column frame and moves up and down along the linear guide rails, driven by a hydraulic cylinder. The lifting drive cylinder is equipped with a hydraulic lock to prevent falling in case of hydraulic failure. The slewing mechanism is installed on the lifting slide plate and is driven by a motor that engages a gear with a slewing bearing to achieve the tilting function. The motor is equipped with an encoder; when the tilting angle deviation exceeds a set value, the equipment alarms and automatically adjusts to ensure synchronous tilting. The lifting anti-fall device uses pneumatic pins, with two sets of pneumatic pins inserted into evenly distributed elongated holes in the main frame of the column to achieve the anti-fall function. The lifting slide plate and the crossbeam are flexibly connected by pins, with one end of the crossbeam connection hole being a round hole and the other end an elongated hole to absorb asynchronous deviations. In addition, a pull-wire encoder is installed on the main frame of the column. When the lifting height deviation exceeds the set value, the equipment alarms and automatically adjusts to further improve lifting synchronization.

[0032] The flexible clamping device includes a front centering clamping device, a rear centering clamping device, a tail clamping device, and a positioning mechanism, all arranged on the crossbeam. There are six front centering clamping devices, controlled by hydraulic cylinders and driven by rack and pinion gears, symmetrically arranged along the Y-axis of the turntable structure, allowing movement in the Y-direction. There are two rear centering clamping devices, including a rear centering device and a rear clamping device, both controlled by hydraulic cylinders, symmetrically arranged along the Y-axis of the turntable, allowing movement in the X and Y directions along the track. To facilitate product changes, the clamping devices use a servo motor-controlled screw jack for height adjustment, accommodating different height differences in the turntable structure. There are two tail clamping devices, controlled by hydraulic cylinders, symmetrically arranged along the Y-axis of the turntable, allowing movement in the X-direction along the guide rail and height adjustment along the Z-axis. The centering clamping device includes a fixed frame, hydraulic cylinders, lifting blocks, pressure heads, centering pads, guide pins, return spring one, return spring two, screws, hinge pins, and lifting rings. The front end of the fixed frame features a slotted design, with a replaceable centering pad installed within the slot. The centering pad contacts the side of the workpiece's base plate, achieving centering under the drive of the centering cylinder. The slotted design also prevents the workpiece from falling during flipping. The cylinder is a single-acting cylinder. The lifting block is guided by a guide pin, and the pressure head can rotate along the hinge axis. Screws are installed on the lifting block and connected by a return spring. The cylinder drives the lifting block to press the pressure head against the workpiece's base plate, ultimately achieving the clamping function. When releasing the workpiece, the lifting block moves downwards under the action of the return spring, simultaneously opening the return spring and its connected pressure head. A lifting ring is provided for easy installation of the centering and clamping device.

[0033] The positioning mechanism uses two impact-resistant pins for positioning, located at the end of the workpiece. A safety rope device is mounted on the main frame of the column, with steel wire ropes connecting both ends. This device allows workers to suspend a safety rope during welding operations and can move along the Z-axis with the lifting slide. One end is a winch for easy attachment of the steel wire rope. The lifting platform includes a railing, steps, lifting device, and rails. Designed according to the length of the crossbeam, it meets the needs of workers to ascend and descend to weld workpieces. The height and position along the rails can be adjusted via the lifting device. The steps have a partial telescopic function, facilitating workers to access the workpiece to complete welding. The steps are located below the platform plane; they are pushed out when in use and pushed back in when not in use. The lifting platform is electrically interlocked with the tilting and positioning machine; the tilting and positioning machine can only perform tilting or lifting actions when the lifting platform is at its furthest point.

[0034] As attached Figure 2 As shown, in the head-and-tail frame type flip-and-position machine of the present invention, two column structures are connected by a crossbeam, flexible clamps are arranged according to the clamping position of the turntable structure, and lifting work platforms are arranged on the front and rear sides of the flip-and-position machine.

[0035] As attached Figure 3 and attachedFigure 4 As shown, the column structure of this invention includes a main column frame, linear guide rails, a lifting slide plate, a lifting drive cylinder, a lifting anti-fall device, a tilting reducer, a tilting motor, a wire encoder, a tilting brake, and a slewing mechanism. The linear guide rails are installed in a grooved plate inside the gantry of the main column frame, and their length is designed according to the required lifting height. The lifting slide plate is box-type, connected to the linear guide rails via a slider, and slides along the height direction via the lifting drive cylinder. The slewing mechanism is installed on the lifting slide plate, driven by a motor that engages a gear with a slewing bearing to achieve the tilting function. The motor is equipped with an encoder to ensure synchronous tilting.

[0036] As attached Figure 5 As shown, the crossbeam and flexible fixture of the present invention include a crossbeam, a front centering and clamping device, a rear centering device, a rear clamping device, a tail clamping device, a screw jack, a positioning mechanism, a hydraulic cylinder, a servo motor, a guide rail, gears, and a rack. The flexible fixture is arranged on the crossbeam according to the characteristics of the workpiece. The front centering and clamping device consists of three sets, driven by hydraulic cylinders and a gear and rack transmission. The rear centering and clamping devices are separately arranged, with a screw jack below the rear clamping device, allowing for height adjustment along the Z-axis. The pressure block on the tail clamping device can be adjusted for height along the Z-axis. The rear centering device, the rear clamping device, and the tail clamping device can all be moved along the X-axis of the crossbeam by a servo motor to accommodate workpieces of different specifications. The positioning mechanism is a shaft structure located at the end of the crossbeam, serving to position the workpiece along the X-axis.

[0037] As attached Figure 6 and attached Figure 7 As shown, the centering and clamping device of the present invention includes a hydraulic cylinder, a lifting block, a guide pin, a first return spring, a second return spring, screws, a fixed frame, a pressure head, a centering pad, a hinge shaft, and a lifting ring. Screws are installed on both the pressure head and the lifting block, and they are connected by the first return spring. The second return spring passes through the guide pin and contacts both the fixed frame and the lifting block. The pressure head can rotate radially along the hinge shaft. The centering pad is mounted on the fixed frame for easy replacement. After the workpiece is placed on the fixed frame of the centering and clamping device, the centering function is achieved by the centering pad contacting and pushing the edge of the workpiece, while the hydraulic cylinder drives the lifting block to move the pressure head to achieve the clamping function. When the hydraulic cylinder releases its force, the pressure head can release the workpiece under the action of the first and second return springs.

[0038] As attached Figure 8 As shown, the lifting platform of the present invention includes a lifting device, a footboard, a footboard telescopic section, a railing, and a track. The lifting device can move along the Y-axis of the track, and the tilting platform can only perform its tilting function after being positioned in a safe location away from the tilting positioner by a pre-programmed sequence. The number and extension length of the footboard telescopic section are determined according to actual needs.

[0039] Before loading the workpiece, the tilting and positioning machine returns to its initial 0° position, level with the ground. The positions of the flexible clamping mechanisms are adjusted according to the turntable specifications to facilitate workpiece hoisting and placement. During loading, a crane is used to hoist the turntable structure above the tilting and positioning machine and slowly lower it. Once the end of the turntable structure contacts the positioning mechanism, the workpiece is lowered onto the centering and clamping device. The centering and clamping device, driven by a hydraulic cylinder and gear rack, centers the workpiece and clamps it by lifting it with a hydraulic cylinder. The tail of the turntable structure is clamped by the tail clamping device of the tilting and positioning machine. After the workpiece is fully clamped, the tilting and positioning machine rotates the workpiece to a suitable angle. At this time, the lifting platform moves to the vicinity of the tilting and positioning machine, and the worker enters the lifting platform and is lifted to the welding height to perform welding operations. When the worker needs to enter the workpiece for welding, the safety rope is connected to the safety rope device of the tilting and positioning machine, and then the worker uses the retractable pedal to step onto the workpiece to complete the welding. After the workers complete all the welds, the lifting platform moves to a safe area, the flipping and positioning machine flips the workpiece to a 0° upright position, the flexible clamps release their mechanisms, and the overhead crane lifts the workpiece off the platform.

[0040] Testing revealed a rated load capacity of ≥50t (workpiece only), capable of 0~360° rotation. It can be applied to turntable structural components of various crawler crane models with lengths exceeding 13 meters, widths exceeding 3.5 meters, and heights exceeding 3 meters. This solves the problem of rotation and repositioning during the manual welding process of turntable structural components, avoiding the problems of excessive rotation times, low rotation efficiency, high skill requirements for workers, high labor intensity, and significant safety risks associated with existing technologies using cranes for rotation.

[0041] This invention's head-and-tail frame type flipping and positioning machine employs hydraulic clamping and lifting, and servo motor flipping and position adjustment, resulting in high reliability and precise positioning. It is equipped with safety protection devices such as a flipping brake, a pneumatic pin-type lifting anti-fall device, and a hydraulic cylinder lock, ensuring strong safety. A pull-wire encoder and a motor encoder ensure synchronous lifting and flipping, while the flexible pin connection between the lifting slide and the crossbeam absorbs asynchronous deviations, resulting in good synchronization between lifting and flipping. A safety rope device is included to reduce the safety risks for workers operating at heights. The lifting platform's footboard has a partial telescopic function, facilitating workers' access to or entry into the workpiece for welding operations, reducing worker labor intensity. Using this device effectively solves the problems of low flipping efficiency and poor safety, improving both production efficiency and safety.

Claims

1. A head-and-tail frame type turning and positioning machine for manual welding and turning of turntable structural components, characterized in that: It includes a turntable structure (1), a column structure (2), a crossbeam (3), a flexible clamp (4), a lifting platform (5), and a safety rope hanging device (6); the turntable structure (1) has column structures (2) at both ends, and the column structures (2) are connected by a crossbeam (3); the flexible clamp (4) is located on the crossbeam (3), the safety rope hanging device (6) is located on the main frame (8) of the column structure (2), and the safety rope hanging device (6) is located between the column structures (2).

2. The head-and-tail frame type turning and positioning machine for manual welding and turning of turntable structural components according to claim 1, characterized in that: The column structure (2) includes a linear guide rail (7), a column main frame (8), a tilting reducer (9), a tilting motor (10), a lifting drive cylinder (11), a wire encoder (12), a lifting slide plate (13), a tilting brake (14), a lifting anti-fall device (15), and a slewing mechanism (16).

3. The head-and-tail frame type turning and positioning machine for manual welding and turning of turntable structural components according to claim 2, characterized in that: The main frame (8) of the column adopts a prefabricated gantry structure. The inner side of the gantry of the main frame (8) of the column is provided with a lifting slide plate (13). The lifting slide plate (13) is driven by the lifting drive cylinder (11) to move up and down along the linear guide rail (7). The lifting drive cylinder (11) is provided with a lifting hydraulic lock. The lifting slide plate (13) is provided with a slewing mechanism (16). The slewing mechanism (16) is driven by the slewing motor (10) to mesh with the slewing bearing to achieve slewing. The slewing motor (10) is provided with an encoder.

4. The head-and-tail frame type turning and positioning machine for manual welding and turning of turntable structural components according to claim 2, characterized in that: The lifting anti-fall device (15) adopts a pneumatic pin structure. It achieves anti-fall by inserting two sets of pneumatic pin shafts into the evenly distributed elongated holes of the column main frame (8). The lifting slide plate (13) and the crossbeam (3) are connected by pin shaft (17). One end of the connection hole of the crossbeam (3) is a round hole and the other end is an elongated hole. The column main frame (8) is equipped with a pull-wire encoder (12).

5. The head-and-tail frame type turning and positioning machine for manual welding and turning of turntable structural components according to claim 1, characterized in that: The flexible clamp (4) includes a positioning mechanism (18) arranged on the crossbeam (3), a front centering clamping device (19), a rear centering device (20), a rear clamping device (21) and a tail clamping device (22).

6. The head-and-tail frame type turning and positioning machine for manual welding and turning of turntable structural components according to claim 5, characterized in that: The front centering and clamping device (19) is set in 6 locations, controlled by a hydraulic cylinder (24), and driven by a gear (23) and rack (25). It is symmetrically arranged in the Y-axis direction of the turntable structure (1) and moves along the Y-axis direction. The rear centering and clamping device is set in 2 locations, controlled by a hydraulic cylinder, including a rear centering device (20) and a rear clamping device (21). It is symmetrically arranged in the Y-axis direction of the turntable structure (1) and moves along the Y-axis direction and the X-axis direction of the track (26). The tail clamping device (22) is set in 2 locations, controlled by a hydraulic cylinder. It is symmetrically arranged in the Y-axis direction of the turntable structure (1) and moves along the X-axis direction of the track (26). The height is adjusted along the Z-axis direction. The positioning mechanism (18) uses 2 pins (17) set at the end of the workpiece. The rear clamping device (21) is connected to a servo motor (27) and a screw jack (28).

7. The head-and-tail frame type turning and positioning machine for manual welding and turning of turntable structural components according to claim 6, characterized in that: The centering and clamping device includes a guide pin (29), a second return spring (30), a screw (31), a first return spring (32), a lifting block (33), a second oil cylinder (34), a hinge shaft (35), a fixing frame (36), a lifting ring (37), a pressure head (38), and a centering pad (39).

8. The head-and-tail frame type turning and positioning machine for manual welding and turning of turntable structural components according to claim 7, characterized in that: The front end of the fixed frame (36) is slotted, and a replaceable centering pad (39) is installed in the slot. The centering pad (39) contacts the side of the workpiece base plate. The second hydraulic cylinder (34) is a single-acting hydraulic cylinder. The lifting block (33) is guided by the guide pin (29). The pressure head (38) rotates along the hinge axis (35). The lifting block (33) and the pressure head (38) are respectively equipped with screws (31) and connected by the first return spring (32). The lifting block (33) is driven by the second hydraulic cylinder (34) to realize the pressure head (38) pressing the workpiece base plate. The lifting block (33) moves under the action of the second return spring (30). The centering and pressing device is installed by the lifting ring (37).

9. The head-and-tail frame type turning and positioning machine for manual welding and turning of turntable structural components according to claim 1, characterized in that: The safety rope device (6) is connected at both ends by steel wire ropes.

10. The head-and-tail frame type turning and positioning machine for manual welding and turning of turntable structural components according to claim 1, characterized in that: The lifting platform (5) includes a fence (40), a pedal telescopic part (41), a platform track (42), a pedal (43), and a lifting device (44); the pedal (43) is provided with a pedal telescopic part (41), and the lifting platform (5) is moved within the limitation of the platform track (42) by the lifting device (44). The lifting platform (5) is provided with a fence (40).

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