Railway flat car underframe box beam H-shaped single rail beam cutting and polishing production line

Abstract

The present application belongs to the technical field of cutting and polishing of single-beam of railway wagon underframe, and discloses a railway flat car underframe box beam H-shaped single-beam cutting and polishing production line, which comprises a roller conveying system, a profile steel overturning system and a multi-angle cutting and polishing system. The profile steel overturning system rotates the single-beam of "H" shape conveyed by the roller conveying system by 90 degrees, facilitating subsequent cutting and polishing. The multi-angle cutting and polishing system comprises an articulated arm robot, a mounting frame, a polishing mechanism and a cutting mechanism, so that the position of the polishing mechanism and the cutting mechanism can be adjusted through the articulated arm robot. The cutting mechanism comprises a cutting torch mounting frame, a flame cutting cutting torch and a guide wheel. The polishing mechanism comprises a triangular track transmission assembly, a triangular track driving assembly and a pneumatic buffer device. The present application has the advantages of multi-angle cutting and polishing, high practical value, significant improvement of cutting and polishing efficiency and quality, fully automatic process and the like.

Description

Technical Field

[0001] This invention belongs to the field of single beam cutting and grinding technology for railway freight car underframes, specifically relating to a production line for cutting and grinding H-beams of box-shaped steel single beams for railway flatcar underframes. Background Technology

[0002] The central beam is composed of two single beams connected by a partition. However, the side plates at both ends of the single beam along its length affect the welding connection of the partition. They need to be cut off and the two ends of the partition are welded to the two oppositely arranged single beams at the cutting positions. Currently, the single beams are placed horizontally and then manually marked. The accuracy of manual marking is poor. Then, the cutting is done manually with a hand-held cutting torch, and then manually polished with a grinding wheel. This requires multiple people to cooperate, the process is complicated, the operation is cumbersome, the efficiency is low, there are safety hazards, and the cutting quality is poor. Summary of the Invention

[0003] This invention aims to provide a production line for cutting and grinding H-beams of box girder boxes for railway flatcars. The automatic cutting and grinding process offers high quality and efficient operation, solving the problems of low efficiency, poor product quality, and low safety caused by manual hand-held cutting torches in current cutting and grinding processes.

[0004] Therefore, the technical solution adopted by this invention is as follows: a single beam cutting and grinding production line for H-shaped steel box girder of railway flatcar underframe, including a roller conveying system, a steel section turning system, and a multi-angle cutting and grinding system. The steel section turning system includes a turning power drive component, a turning body, a turning body support frame, and a turning body turning transmission component. The turning power drive component drives the turning body to turn under the support of the turning body support frame through the turning body turning transmission component, thereby rotating the "H"-shaped single beam conveyed by the roller conveying system by 90 degrees, facilitating subsequent cutting and grinding. The multi-angle cutting and grinding system includes an articulated arm robot and a mounting frame installed at the movable end of the articulated arm robot. The system includes a grinding mechanism and a cutting mechanism mounted on the mounting frame, one above the other, allowing for positional interchange of the grinding and cutting mechanisms via an articulated robotic arm. The cutting mechanism comprises a torch mounting frame that can be horizontally and floatingly mounted below the mounting frame, a flame cutting torch that can be vertically and movably mounted on the torch mounting frame, and guide wheels mounted at the bottom of the torch mounting frame for cutting deviation correction, enabling the flame cutting torch to stably cut along the single-beam design path. The grinding mechanism includes a triangular track transmission assembly, a triangular track drive assembly, and a pneumatic buffer device. The triangular track drive assembly is used to drive the triangular track transmission assembly to grind the single-beam cut and weld.

[0005] As a preferred embodiment of the above scheme, the idler conveying system includes idlers arranged at intervals in front and behind, the multi-angle cutting and grinding system adopts two units installed at intervals in front and behind, so that the end plates of a single beam can be cut and ground simultaneously, and the steel section turning system adopts two units arranged at intervals in front and behind, which are arranged at intervals according to the length of a single beam, and the arrangement is reasonable.

[0006] More preferably, the mounting frame includes a vertical left side plate on the left, a horizontal bottom frame below, and a vertical right side plate on the right, forming a "U"-shaped frame structure. The vertical left side plate is equipped with a mounting flange that mates with the movable end of the articulated arm robot. The torch mounting bracket is mounted below the mounting frame via a horizontal floating assembly. The flame cutting torch is mounted on the vertical section of the torch mounting bracket via a vertical movable assembly. The guide wheel is mounted at the bottom of the torch mounting bracket via a bending frame that matches the size of the upper edge of the single beam. The installation position is cleverly arranged, and the space is used rationally.

[0007] More preferably, the triangular track transmission assembly includes a grinding wheel, a grinding driven wheel, a grinding tension wheel, and a grinding belt. The triangular track drive assembly includes a drive motor, a drive wheel, a synchronous wheel, a drive tension wheel, and a drive synchronous belt. The drive wheel is coaxially connected to the output shaft of the drive motor, and the synchronous wheel is coaxially connected to the grinding wheel. When the drive motor drives the drive wheel to rotate, it drives the synchronous wheel to rotate through the drive synchronous belt, thereby causing the grinding wheel to rotate and start the grinding belt. The grinding tension wheel is provided with anti-deviation guards on its left and right sides. The grinding tension wheel is mounted on the lifting frame of the pneumatic tensioning component, thereby controlling the tension and loosening of the grinding belt by driving the grinding tension wheel to rise and fall. The anti-deviation guards and the pneumatic tensioning component together ensure that the sanding belt will not deviate excessively during high-speed operation, and the structure is interlocked.

[0008] The drive motor's power is transmitted to the grinding wheel via a closed-loop synchronous belt. The grinding wheel, grinding tension wheel, and grinding driven wheel form a triangular wheel assembly structure. The friction generated by the tension drives the grinding belt to rotate synchronously with the wheel at high speed, ultimately achieving single-beam grinding.

[0009] More preferably, the transverse floating assembly includes a transverse guide rail, a movable connecting block, and a return spring. The transverse guide rail is installed below the mounting frame, the movable connecting block slides along the transverse guide rail, and the return spring horizontally connects the right end of the transverse guide rail and the movable connecting block, so that the guide wheel is always in contact with the vertical side of the single beam, thereby ensuring that the cutting path of the flame cutting torch is consistent with the design path.

[0010] More preferably, the vertical movable component includes a vertical guide rail mounted on the torch mounting frame and a vertical slider that moves along the vertical guide rail. The vertical slider is equipped with a clamp for fixing the flame cutting torch. The vertical guide rail has baffles at both ends, and a buffer pad is installed between the lower baffle and the vertical slider to prevent direct collision between the vertical slider and the lower baffle, while also fixing the vertical slider. The baffles at both ends and the vertical slider are connected by the same vertical screw, and the vertical slider and the vertical screw are threadedly engaged, so that the vertical slider and the installed flame cutting torch can be adjusted up and down by turning the vertical screw, allowing for flexible adjustment.

[0011] A further preferred embodiment is that a contact positioning probe is elastically mounted on the front end of the vertical right side plate, and a probe guide sleeve is mounted on the front end of the vertical right side plate. The tail end of the contact positioning probe is mounted in the probe guide sleeve by a spring. Each probe guide sleeve is equipped with a proximity sensor, and the proximity sensor and the contact positioning probe work together to achieve contact positioning. The positioning is accurate, ensuring the cutting quality.

[0012] The bending frame includes a "C"-shaped structure formed by a horizontal top plate, a vertical middle plate, and a horizontal bottom plate. The horizontal top plate is horizontally inclined and has a notch to accommodate the flame cutting torch. The upper and lower ends of the vertical middle plate are installed on the horizontal top plate and the horizontal bottom plate with bolts fitted with springs, so that the bolt connection is convenient and flexible for installation and adjustment.

[0013] More preferably, the top four corners of the tilting support frame are provided with support rollers that support the tilting body inward, and the bottom four corners of the tilting support frame are provided with height-adjusting feet. The bottom of the tilting support frame extends to the left to form an installation platform for installing the tilting power drive component. The structure is reasonably designed.

[0014] The flipping body includes a flipping main body, multiple unpowered rollers, and a positioning cylinder. The multiple unpowered rollers are respectively installed on the vertical and horizontal panels of the flipping main body to support the bottom and right side of the single beam. The positioning cylinder is installed on the horizontal panel of the flipping main body and corresponds to the left side of the single beam. The positioning cylinder can extend and abut against the single beam through its telescopic end. The structure is reasonably designed, and the single beam is limited on the left and right sides to ensure accurate cutting path.

[0015] Further preferably, the telescopic end of the positioning cylinder is equipped with a disc to increase the contact area. The positioning cylinder is mounted on the horizontal panel of the flipping body through a cylinder mounting bracket. The flipping power drive includes a three-phase asynchronous motor and a two-stage worm gear reducer. The vertical panel of the flipping body is longer than the horizontal panel, and the length of the vertically placed unpowered roller is also longer than that of the horizontally placed unpowered roller. The horizontal unpowered roller consists of two rollers spaced apart front to back, and the vertical unpowered roller consists of one roller located between the two horizontally placed unpowered rollers. The front and rear sides of the flipping body are provided with weight-reducing holes to facilitate the flipping body being driven to flip after weight reduction.

[0016] More preferably, the flipping transmission component includes a driving sprocket, a driven sprocket, a transmission chain, a flipping sprocket, and a flipping chain; the driving sprocket is coaxially connected to the output end of the flipping power drive component, the driven sprocket is coaxially connected to the flipping sprocket, the driving sprocket and the driven sprocket are connected by the transmission chain, and the two ends of the flipping chain are respectively installed on the horizontal and vertical panels of the flipping body and mesh with the flipping sprocket along the arc-shaped outer periphery of the flipping body. When the driving sprocket drives the driven sprocket to rotate through the transmission chain, the flipping sprocket rotates synchronously and pulls the flipping body to flip through the flipping chain. Through the cooperation of the chain and the drive system, stable positioning is achieved during the single beam flipping process, reducing errors from manual adjustment. The structure is interlocked, the transmission is stable, and the flipping body flips stably.

[0017] The beneficial effects of this invention are:

[0018] (1) Compared with the current manual hand-held cutting torch cutting and then manual grinding, this solution adopts a cutting and grinding production line to realize automatic cutting and grinding of single beams in the middle beam of railway freight car underframe. First, the flame cutting torch is driven by the articulated arm robot to make stable cutting along the design path of the single beam. Finally, the articulated arm robot rotates 90 degrees to adjust the angle so that the triangular track transmission component can contact the cut. The process is simple and intuitive, saves manpower, and the articulated arm robot realizes multi-angle and multi-directional cutting and grinding. It is highly flexible and has high practical value.

[0019] (2) Since the torch mounting frame can be horizontally and floatingly installed below the mounting frame, and the flame cutting torch can be vertically and movable on the torch mounting frame, the flame cutting torch has flexible fluctuation adjustment in the horizontal and vertical directions, so that the flame cutting torch can cut along the workpiece contour trajectory. Even if there is a slight bending on the surface of the single beam, it can ensure that the vertical distance between any position of the entire cutting trajectory and the workpiece is consistent. During the cutting process driven by the articulated arm robot, the guide wheel can always guide the flame cutting torch to perform "position correction", ensuring dimensional consistency and high cutting accuracy.

[0020] (3) The pneumatic buffer device provides pressure adjustment for the contact between the sand belt and the single beam during the grinding process, ensuring the stability of the grinding effect. The triangular track drive assembly drives the triangular track transmission assembly to grind the cut and weld of the single beam, effectively improving the cutting and grinding efficiency and quality, and shortening the single beam cutting and grinding period.

[0021] (4) The "H"-shaped single beam conveyed by the roller conveyor system is driven by the flipping power drive component to flip the flipping body under the support of the flipping body support frame, so that the single beam rotates 90 degrees to the "I" shape, realizing multi-angle flipping operation, meeting the posture adjustment needs of the workpiece in different processes. The single load-bearing capacity of the steel flipping system can reach 2.5 tons, which facilitates the subsequent cutting and grinding of the front and rear horizontal upper side plates of the "I" shape. The operation is closely linked, and the process is fully automated, reducing personnel costs.

[0022] In summary, this invention offers advantages such as multi-angle cutting and grinding, high practical value, significantly improved cutting and grinding efficiency and quality, and a fully automated process. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the multi-angle cutting and grinding system of the present invention.

[0024] Figure 2 This is a structural schematic diagram of the steel section flipping system from the first perspective.

[0025] Figure 3 This is a structural schematic diagram of the steel section flipping system from a second perspective.

[0026] Figure 4 This is a schematic diagram of a single beam placed on a steel tilting system without being tilted.

[0027] Figure 5 This is a schematic diagram of the grinding and cutting mechanisms mounted on the mounting frame.

[0028] Figure 6 This is a schematic diagram of the grinding mechanism.

[0029] Figure 7 This is a structural schematic diagram of the grinding mechanism from another perspective.

[0030] Figure 8 This is a schematic diagram of the cutting mechanism. Detailed Implementation

[0031] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0032] Combination Figures 1-8As shown, a single beam cutting and grinding production line for H-beam box girder of railway flatcar underframe consists of a roller conveying system, a steel section turning system 3, and a multi-angle cutting and grinding system 2.

[0033] The idler conveying system consists of idlers arranged at intervals in front and behind. The multi-angle cutting and grinding system 2 preferably uses two idlers installed at intervals in front and behind, so that the end plates of the single beam 1 can be cut and ground at the same time. The steel section turning system 3 preferably uses two idlers arranged at intervals in front and behind.

[0034] The steel section turning system 3 consists of a turning power drive component 31, a turning body 32, a turning body support frame 33, and a turning body turning transmission component 34. The turning power drive component 31 drives the turning body 32 to turn under the support of the turning body support frame 33 through the turning body turning transmission component 34, thereby rotating the "H"-shaped single beam 1 conveyed by the roller conveyor system by 90 degrees, which facilitates subsequent cutting and grinding.

[0035] The top four corners of the tilting support frame 33 are provided with support rollers 331 that support the tilting body 32 inwards. The bottom four corners of the tilting support frame 33 are provided with height adjustment feet 332. The bottom of the tilting support frame 33 extends to the left to form an installation platform for installing the tilting power drive component 31. The tilting body 32 is composed of a tilting main body 321, multiple unpowered rollers 322, and a positioning cylinder 323. The multiple unpowered rollers 322 are respectively installed on the vertical and horizontal panels of the tilting main body 321 to support the bottom and right side of the single beam 1. The positioning cylinder 323 is installed on the horizontal panel of the tilting main body 321 and corresponds to the left side of the single beam 1, so that the telescopic end of the positioning cylinder 323 can extend to abut against the limiting single beam 1.

[0036] The positioning cylinder 323 has a disc 323a with an increased contact area installed at its telescopic end. The positioning cylinder 323 is mounted on the horizontal panel of the flipping body 321 via a cylinder mounting bracket 323b. The flipping power drive component 31 consists of a three-phase asynchronous motor and a two-stage worm gear reducer. The vertical panel of the flipping body 32 is longer than the horizontal panel, and the length of the vertically placed unpowered roller 322 is also longer than that of the horizontally placed unpowered roller 322. Two horizontally placed unpowered rollers 322 are arranged at intervals. Preferably, one vertically placed unpowered roller 322 is used and is located between the two horizontally placed unpowered rollers 322. Weight reduction holes are provided around the front and rear sides of the flipping body 321.

[0037] The flipping transmission component 34 consists of a drive sprocket 341, a driven sprocket 342, a transmission chain 343, a flipping sprocket 344, and a flipping chain 345. The drive sprocket 341 is coaxially connected to the output end of the flipping power drive component 31, and the driven sprocket 342 is coaxially connected to the flipping sprocket 344. The drive sprocket 341 and the driven sprocket 342 are connected by the transmission chain 343. The two ends of the flipping chain 345 are respectively installed on the horizontal and vertical panels of the flipping body 321 and mesh with the flipping sprocket 344 along the arc-shaped outer periphery of the flipping body 32. When the drive sprocket 341 drives the driven sprocket 342 to rotate through the transmission chain 343, the flipping sprocket 344 rotates synchronously and pulls the flipping body 32 to flip through the flipping chain 345.

[0038] The multi-angle cutting and grinding system 2 consists of an articulated robotic arm 21, a mounting frame 22 installed at the movable end of the articulated robotic arm 21, and a grinding mechanism 23 and a cutting mechanism 24 mounted on the mounting frame 22, one above the other. This allows the articulated robotic arm 21 to swap the positions of the grinding mechanism 23 and the cutting mechanism 24. The cutting mechanism 24 consists of a torch mounting frame 241 that can be horizontally and floatingly installed below the mounting frame 22, a flame cutting torch 242 that can be vertically and movably installed on the torch mounting frame 241, and a guide wheel 243 installed at the bottom of the torch mounting frame 241 for cutting deviation correction. This allows the flame cutting torch 242 to make stable cuts along the designed path of the single beam 1. The grinding mechanism 23 consists of a triangular track drive assembly 231, a triangular track drive assembly 232, and a pneumatic buffer device 233. The triangular track drive assembly 232 is used to drive the triangular track drive assembly 231 to grind the cut and weld of the single beam 1.

[0039] The mounting frame 22 consists of a vertical left side plate on the left, a horizontal bottom frame 221 below, and a vertical right side plate 222 on the right. The vertical left side plate is equipped with a mounting flange 223 that docks with the movable end of the articulated arm robot 21. The torch mounting frame 241 is mounted below the mounting frame 22 via a horizontal floating assembly 25. The flame cutting torch 242 is mounted on the vertical section of the torch mounting frame 241 via a vertical moving assembly 26. The guide wheel 243 is mounted at the bottom of the torch mounting frame 241 via a bending frame 27 that matches the size of the upper edge of the single beam 1.

[0040] The triangular track transmission assembly 231 consists of a grinding wheel 231a, a grinding driven wheel 231b, a grinding tension wheel 231c, and a grinding belt 231d. The triangular track drive assembly 232 consists of a drive motor 232a, a drive wheel 232b, a timing wheel 232c, a drive tension wheel 232d, and a drive timing belt 232e. The drive wheel 232b is coaxially connected to the output shaft of the drive motor 232a, and the timing wheel 232c is coaxial with the grinding wheel 231a. When the drive motor 232a drives the drive wheel 232b to rotate, it drives the synchronous wheel 232c to rotate through the drive synchronous belt 232e, thereby causing the grinding wheel 231a to rotate and start the grinding belt 231d. The grinding tension wheel 231c is provided with anti-deviation guards on the left and right sides. The grinding tension wheel 231c is installed on the lifting frame of the pneumatic tensioning component 231e, so the tension and loosening of the grinding belt 231d are controlled by driving the grinding tension wheel 231c to rise and fall.

[0041] The horizontal floating assembly 25 consists of a horizontal guide rail 251, a movable connecting block 252, and a return spring 253. The horizontal guide rail 251 is installed below the mounting frame 22. The movable connecting block 252 slides along the horizontal guide rail 251. The return spring 253 horizontally connects the right end of the horizontal guide rail 251 and the movable connecting block 252, so that the guide wheel 243 is always in contact with the vertical side of the single beam 1.

[0042] The vertical movable component 26 consists of a vertical guide rail 261 mounted on the torch mounting frame 241 and a vertical slider 262 that moves along the vertical guide rail 261. The vertical slider 262 is equipped with a clamp 263 for fixing the flame cutting torch 242. The vertical guide rail 261 has baffles at both ends. A buffer pad 262a is installed between the baffle at the lower end and the vertical slider 262. The baffles at both ends and the vertical slider 262 are connected by the same vertical screw 264. The vertical slider 262 and the vertical screw 264 are threaded together, so that the vertical slider 262 and the installed flame cutting torch 242 can be adjusted up and down by turning the vertical screw 264.

[0043] A contact positioning probe 222a is elastically installed at the front end of the vertical right side plate 222, and a probe guide sleeve 222b is installed at the front end of the vertical right side plate 222. The tail end of the contact positioning probe 222a is installed in the probe guide sleeve 222b through a spring 222c. A proximity sensor 222d is installed on the probe guide sleeve 222b. The proximity sensor 222d and the contact positioning probe 222a work together to achieve contact positioning. The bending frame 27 is a "C"-shaped structure formed by a horizontal top plate 271, a vertical middle plate 272 and a horizontal bottom plate 273. The horizontal top plate 271 is horizontally inclined and has a notch to allow the flame cutting torch 242 to pass. The upper and lower ends of the vertical middle plate 272 are installed on the horizontal top plate 271 and the horizontal bottom plate 273 with bolts fitted with springs.

[0044] Single beam 1 is output from the previous process through the roller conveyor system. The single beam is flipped 90 degrees by the steel section flipping system, changing from an "H" shaped arrangement to an "I" shaped arrangement. The positioning cylinder 323 clamps and fixes the single beam 1 on the left and right sides.

[0045] Then, the articulated arm robot 21 is started, and then adjusted so that the contact positioning probe 222a contacts the upper plate of the single beam 1. When the spring 222c is compressed, the proximity sensor 222d receives the signal and detects the height of the upper plate of the single beam 1 to achieve contact positioning. Then, the end of the articulated arm robot 21 is rotated 90° so that the flame cutting torch 242 of the cutting mechanism 24 is aligned with the part to be cut. The vertical slider 262 and the installed flame cutting torch 242 can be adjusted up and down by turning the vertical screw 264 so that the flame cutting torch 242 fits the point to be cut, and then the cutting is started.

[0046] After the cutting is completed, the articulated arm robot 21 returns to its original position, then rotates 180° to align the abrasive belt 231d with the cut, and then starts the abrasive grinding process.

Claims

1. A production line for cutting and grinding H-beams of box girder box girders for railway flatcars, characterized in that: The system includes a roller conveying system, a steel section turning system (3), and a multi-angle cutting and grinding system (2). The steel section turning system (3) includes a turning power drive (31), a turning body (32), a turning body support frame (33), and a turning body turning transmission component (34). The turning power drive (31) drives the turning body (32) to turn under the support of the turning body support frame (33) through the turning body turning transmission component (34), thereby rotating the "H"-shaped single beam (1) conveyed by the roller conveying system by 90 degrees, which facilitates subsequent cutting and grinding. The multi-angle cutting and grinding system (2) includes an articulated arm robot (21), a mounting frame (22) installed on the movable end of the articulated arm robot (21), and a grinding mechanism (23) and a cutting mechanism (24) installed on the mounting frame (22) one above the other, thereby enabling... The positions of the grinding mechanism (23) and the cutting mechanism (24) are swapped by an articulated arm robot (21). The cutting mechanism (24) includes a torch mounting frame (241) that can be horizontally and floatingly installed below the mounting frame (22), a flame cutting torch (242) that can be vertically and movably installed on the torch mounting frame (241), and a guide wheel (243) installed at the bottom of the torch mounting frame (241) for cutting correction, so that the flame cutting torch (242) can make stable cutting along the design path of the single beam (1). The grinding mechanism (23) includes a triangular track transmission assembly (231), a triangular track drive assembly (232), and a pneumatic buffer device (233). The triangular track drive assembly (232) is used to drive the triangular track transmission assembly (231) to grind the cut and weld of the single beam (1).

2. The production line for cutting and grinding H-beams of railway flatcar underframe box girders according to claim 1, characterized in that: The roller conveying system includes rollers arranged at intervals in front and behind. The multi-angle cutting and grinding system (2) uses two units installed at intervals in front and behind, so that the side plates at both ends of the single beam (1) can be cut and ground simultaneously. The steel section turning system (3) uses two units arranged at intervals in front and behind.

3. The production line for cutting and grinding H-beams of railway flatcar underframe box girders according to claim 1, characterized in that: The mounting frame (22) includes a vertical left side plate on the left, a horizontal bottom frame (221) below, and a vertical right side plate (222) on the right. The vertical left side plate is equipped with a mounting flange (223) that docks with the movable end of the articulated arm robot (21). The torch mounting frame (241) is mounted below the mounting frame (22) via a transverse floating assembly (25). The flame cutting torch (242) is mounted on the vertical section of the torch mounting frame (241) via a vertical moving assembly (26). The guide wheel (243) is mounted on the bottom of the torch mounting frame (241) via a bending frame (27) that matches the upper edge size of the single beam (1).

4. The production line for cutting and grinding H-beams of railway flatcar underframe box girders according to claim 1, characterized in that: The triangular track transmission assembly (231) includes a grinding wheel (231a), a grinding driven wheel (231b), a grinding tension wheel (231c), and a grinding belt (231d). The triangular track drive assembly (232) includes a drive motor (232a), a drive wheel (232b), a timing wheel (232c), a drive tension wheel (232d), and a drive timing belt (232e). The drive wheel (232b) is coaxially connected to the output shaft of the drive motor (232a), and the timing wheel (232c) is connected to the grinding wheel (231a). 1a) Coaxial connection: When the drive motor (232a) drives the drive wheel (232b) to rotate, it drives the synchronous wheel (232c) to rotate through the drive synchronous belt (232e), thereby causing the grinding wheel (231a) to rotate and start the grinding belt (231d). The grinding tension wheel (231c) is provided with anti-deviation guards on the left and right sides. The grinding tension wheel (231c) is installed on the lifting frame of the pneumatic tensioning component (231e), thereby controlling the tension and loosening of the grinding belt (231d) by driving the grinding tension wheel (231c) to rise and fall.

5. The production line for cutting and grinding H-beams of railway flatcar underframe box girders according to claim 3, characterized in that: The transverse floating assembly (25) includes a transverse guide rail (251), a movable connecting block (252), and a return spring (253). The transverse guide rail (251) is installed below the mounting frame (22). The movable connecting block (252) slides along the transverse guide rail (251). The return spring (253) is horizontally connected to the right end of the transverse guide rail (251) and the movable connecting block (252), so that the guide wheel (243) is always in contact with the vertical side of the single beam (1).

6. The production line for cutting and grinding H-beams of railway flatcar underframe box girders according to claim 3, characterized in that: The vertical movable component (26) includes a vertical guide rail (261) mounted on a torch mounting frame (241) and a vertical slider (262) moving along the vertical guide rail (261). The vertical slider (262) is equipped with a clamp (263) for fixing the flame cutting torch (242). The vertical guide rail (261) has baffles at both ends. A buffer pad (262a) is installed between the baffle at the lower end and the vertical slider (262). The baffles at both ends and the vertical slider (262) are connected by the same vertical screw (264). The vertical slider (262) and the vertical screw (264) are threaded together, so that the vertical slider (262) and the installed flame cutting torch (242) can be adjusted up and down by turning the vertical screw (264).

7. The production line for cutting and grinding H-beams of railway flatcar underframe box girders according to claim 6, characterized in that: The vertical right side plate (222) is equipped with a contact positioning probe (222a) that is elastically mounted at the front end. The vertical right side plate (222) is equipped with a probe guide sleeve (222b) at the front end. The tail end of the contact positioning probe (222a) is installed in the probe guide sleeve (222b) by a spring (222c). A proximity sensor (222d) is installed on the probe guide sleeve (222b). The proximity sensor (222d) and the contact positioning probe (222a) work together to achieve contact positioning. The bending frame (27) includes a "C"-shaped structure formed by a horizontal top plate (271), a vertical middle plate (272) and a horizontal bottom plate (273). The horizontal top plate (271) is horizontally inclined and has a notch to allow the flame cutting torch (242) to pass. The upper and lower ends of the vertical middle plate (272) are installed on the horizontal top plate (271) and the horizontal bottom plate (273) by bolts fitted with springs.

8. The production line for cutting and grinding H-beams of railway flatcar underframe box girders according to claim 1, characterized in that: The top four corners of the flipping support frame (33) are provided with support rollers (331) that support the flipping body (32) inward, and the bottom four corners of the flipping support frame (33) are provided with height adjustment feet (332). The bottom of the flipping support frame (33) extends to the left to form an installation platform for installing the flipping power drive component (31). The flipping body (32) includes a flipping main body (321), multiple non-powered rollers (322), and a positioning cylinder (323). The multiple non-powered rollers (322) are respectively installed on the vertical and horizontal panels of the flipping main body (321) to support the bottom and right side of the single beam (1). The positioning cylinder (323) is installed on the horizontal panel of the flipping main body (321) and corresponds to the left side of the single beam (1), so that the telescopic end of the positioning cylinder (323) can extend to abut against the limiting single beam (1).

9. The production line for cutting and grinding H-beams of railway flatcar underframe box girders according to claim 8, characterized in that: The positioning cylinder (323) has a disc (323a) with an increased contact area installed at its telescopic end. The positioning cylinder (323) is mounted on the horizontal panel of the flipping body (321) via a cylinder mounting bracket (323b). The flipping power drive component (31) includes a three-phase asynchronous motor and a two-stage worm gear reducer. The vertical panel of the flipping body (32) is longer than the horizontal panel, and the length of the vertically arranged unpowered roller (322) is also longer than that of the horizontally arranged unpowered roller (322). The horizontal unpowered roller (322) consists of two rollers spaced apart front and back, and the vertical unpowered roller (322) consists of one roller located between the two horizontally arranged unpowered rollers (322). The front and rear sides of the flipping body (321) are provided with weight reduction holes.

10. The production line for cutting and grinding H-beams of railway flatcar underframe box girders according to claim 1, characterized in that: The flipping transmission component (34) includes a drive sprocket (341), a driven sprocket (342), a transmission chain (343), a flipping sprocket (344), and a flipping chain (345). The drive sprocket (341) is coaxially connected to the output end of the flipping power drive component (31). The driven sprocket (342) is coaxially connected to the flipping sprocket (344). The drive sprocket (341) and the driven sprocket (342) are connected by the transmission chain (343). The two ends of the flipping chain (345) are respectively installed on the horizontal and vertical panels of the flipping body (321) and mesh with the flipping sprocket (344) along the arc-shaped outer periphery of the flipping body (32). When the drive sprocket (341) drives the driven sprocket (342) to rotate through the transmission chain (343), the flipping sprocket (344) rotates synchronously and pulls the flipping body (32) to flip through the flipping chain (345).

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