Track flat crane loaded with movable crane

Abstract

The invention discloses a rail platform crane loaded with a movable crane, which overcomes the defects of the rail platform crane in the prior art and has the advantages of wide working range, large hoisting weight, high loading and unloading efficiency, large loading capacity, safety and reliability. The concrete structure comprises a rail flat car, an end wall assembly and a movable crane device, wherein a rail grabbing device, a fixed freight bogie, a movable freight bogie, a lifting hook fixing device, a tool box and the like are arranged on the rail flat car; the end wall assembly comprises an end door assembly and an end stop assembly. The movable crane device comprises a guide rail assembly, a column inserting assembly, a movable platform, a crane, a power unit, a crane guardrail and a wireless remote controller assembly. The end wall assembly is connected with the rail flat car through a hinge and a hinge seat, and the movable crane device is connected with the rail flat car through a column inserting assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transportation equipment, and in particular to a rail flatbed crane loaded with a movable crane. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The rail flatbed crane is mainly used for daily track maintenance of subway lines. It can be used for collecting, laying and transporting rails in vehicle depots, parking lots and main lines. It can load, unload and transport long and heavy goods such as rails, track maintenance machinery, engineering components, etc. It can also transport bulk goods.

[0004] Invention patent CN114620079B discloses a crane-carrying flat car for carrying rail-based running equipment. The cranes loaded thereon are all mounted on the flat car body by bolts. The mounting structure is complex, the mounting steps are cumbersome, and the cranes are immovable, which limits the crane's lifting space and loading efficiency. The types of goods being lifted are also limited, making the current rail flatbed cranes unable to meet the requirements of efficient, fast, and safe development of the subway. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a rail-type flatbed crane loaded with a movable crane, which can further increase the hoisting space and lifting weight of the crane, improve the loading efficiency, and increase the types of transportable goods.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] In a first aspect, the present invention provides a rail flatbed crane loaded with a movable crane, comprising a rail flatbed car, an end wall assembly and a movable crane device, wherein at least four rail grabbers are installed at the lower part of the rail flatbed car, and a fixed freight bogie, a floating freight bogie and a hook fixing device are installed at the upper part of the rail flatbed car; a tool box is also provided at the lower part of the rail flatbed car;

[0008] End wall assemblies are arranged at both ends of the rail flat car, and the end wall assemblies include end door assemblies and end stop assemblies; the end stop assemblies are plug-in mounted on the end door assemblies, and the end door assemblies are rotatably mounted on the rail flat car;

[0009] A movable crane device is also provided above the rail flat car, and the movable crane device includes a guide rail assembly, a column plug assembly, a mobile platform, and a crane; the guide rail assembly is arranged on both sides of the rail flat car and is installed on the rail flat car through the column plug assembly, a mobile platform is installed above the guide rail assembly, and a crane is provided on the mobile platform; the end wall assembly is connected to the rail flat car through a hinge and a hinge seat, and the movable crane device is connected to the rail flat car through the column plug assembly.

[0010] Furthermore, the mobile platform is also provided with a power unit, a crane guardrail and a wireless remote control assembly.

[0011] Furthermore, the end door assembly includes an end door steel frame, a hinge, a hinge seat, a stop iron and a rod insertion seat. The end door steel frame is provided with a rod insertion seat, and the end door steel frame is also provided with a hinge. The hinge is connected to the hinge seat through a pin shaft, and the hinge seat is fixedly connected to the rail flat car.

[0012] Furthermore, the end stop assembly includes an insertion rod and an end plate, the end plate is arranged on the insertion rod, a detachable guardrail is also installed on the insertion rod, the insertion rod is installed on the insertion rod seat, and a pin shaft and a β pin are provided for protection and fixing.

[0013] Furthermore, the end stop assembly includes a left end stop and a right end stop, which are mirror images of each other and are respectively plugged into the end door assembly through the plug rod.

[0014] Furthermore, the guide rail assembly includes a side wall, a rack guide rail, a stopper and a sensor; the side wall adopts a channel steel structure, the upper part of the rack guide rail is a straight rack, and the lower part is a concave slide groove structure; the rack guide rail is connected to the side wall with bolts, the stopper is installed on the rack guide rail, and the sensor is installed on the stopper.

[0015] Furthermore, the column plug assembly includes a connector, a column plug and a column socket; a lifting lug is provided on the column plug, the connector is welded to the side wall, the column socket is welded to the underframe of the rail flat car, and a pin shaft protection is provided between the column plug and the column socket.

[0016] Furthermore, the mobile platform includes a mobile platform floor, lifting ears, a slider body, a crane mounting seat, and a mobile platform support frame; the slider body is a groove-shaped structure and its two inner side surfaces are convex surfaces; lifting ears are provided at both ends of the slider body; the mobile platform support frame is a frame structure of steel components, and both sides of the mobile platform support frame are welded to the slider body; a mobile platform floor is provided above the mobile platform support frame; and a crane mounting seat is provided on the mobile platform floor.

[0017] Furthermore, the mobile platform is provided with a transmission shaft, a gear box, a motor and a gear; the motor drives the gear to roll on the rack guide rail through the gear box and the transmission shaft; and the motor is connected to a wireless remote control control unit.

[0018] Furthermore, the crane guardrail assembly and the mobile platform are connected by bolts to facilitate installation and disassembly.

[0019] The beneficial effects of the present invention are as follows:

[0020] The rail flatbed crane loaded with a movable crane of the present invention has a movable crane, which can move back and forth in the longitudinal direction of the vehicle, and the working range of the crane is increased; since the maximum lifting torque of the crane is fixed, the extension length of the crane cantilever is inversely proportional to the lifting weight. When the cargo is far away from the crane, the lifting weight is small, and the crane of the present invention can be moved near the cargo, the crane cantilever is short, and the lifting weight is increased; the crane moves quickly and flexibly, and in order to meet the loading and unloading requirements, the cargo placed under the vehicle does not need to be frequently changed, thereby improving the loading efficiency. There is a freight bogie on the floor of the vehicle body. When transporting long steel rails through a curve, the freight bogie can rotate a certain angle with the curve with the long steel rails, which can reduce the lateral force generated by the steel rails, ensure that the crane will not derail due to the lateral force of the long steel rails, and ensure driving safety. At the same time, a rail grabber is provided to improve the anti-overturning performance of the crane during lifting operations. The rail flatbed crane loaded with a movable crane of the present invention has an end stop assembly above the end door. When the existing rail flatbed crane is used to transport long rails, the end doors need to be laid down to act as a bridge. In order to prevent the two end doors from interfering with each other when the curve is too small, the end doors are generally of a small height. When transporting other goods, the end doors need to be erected. Due to the small height of the end doors, the loading capacity of the crane is limited. The end stop assembly of the present invention adopts a column plug structure, which can be easily installed and disassembled, increases the height of the end doors, and improves the loading capacity of the crane.

[0021] The rail flatbed crane loaded with a movable crane of the present invention has a movable crane device, which can be conveniently and quickly installed on an existing rail flat car. The rail flat car is simple to modify and does not affect the steel structure of the existing flat car. It has high compatibility and strong versatility. The movable crane is driven by a motor + gear and moved by a guide rail + slider body. It has stable performance and strong carrying capacity. At the same time, a stopper and a sensor are installed on the rack guide rail to prevent the mobile platform from sliding off the track. It is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the rail flatbed crane of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the rail flat car of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the end wall assembly of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the end door assembly of the present invention;

[0028] Figure 6 It is a schematic diagram of the structure of the end stop assembly of the present invention;

[0029] Figure 7 It is a structural schematic diagram of the movable crane device of the present invention;

[0030] Figure 8 It is a schematic diagram of the structure of the guide rail assembly and the column plug assembly of the present invention;

[0031] Fig. 9 It is a schematic diagram of the overall structure of the mobile platform of the present invention;

[0032] Fig.10 This is a schematic diagram of the mobile platform of the present invention after some accessories are hidden;

[0033] Fig.11 It is a left view of the mobile platform of the present invention;

[0034] Fig.12 It is a schematic diagram of the overall structure of the crane guardrail assembly of the present invention;

[0035] Fig.13 This is a partial enlarged view of the crane guardrail assembly of the present invention.

[0036] Among them, 1. Rail flat car; 1-1. Underframe; 1-1-1. End door bracket; 1-1-2. Guardrail support plate; 1-2. Bogie; 1-3. Braking device; 1-4. Coupler buffer device; 1-5. Track grabber; 1-6. Fixed freight bogie; 1-7. Floating freight bogie; 1-8. Hook fixing device; 1-9. Tool box; 2. End wall assembly; 2-1. End door assembly; 2-1-1. End door steel frame; 2-1-2, hinge; 2-1-3, hinge seat; 2-1-4, stop iron; 2-1-5, plug rod seat; 2-2, end stop assembly; 2-2-1, support; 2-2-2, plug rod; 2-2-3, end plate; 2-2-4, guardrail; 2-2-5, pin shaft; 2-2-6, β pin; 3, movable crane device; 3-1, guide rail assembly; 3-1-1, side wall; 3-1-2, Rack guide; 3-1-3, stopper; 3-1-4, sensor; 3-2, column plug assembly; 3-2-1, column socket; 3-2-2, column plug; 3-2-3, connector; 3-3, mobile platform; 3-3-1, mobile platform floor; 3-3-2, lifting ear; 3-3-3, slider body; 3-3-4, crane mounting seat; 3-3-5, mobile platform carrier; 3-3-6, transmission shaft; 3 -3-7, gearbox; 3-3-8, motor; 3-3-9, motor mounting bracket; 3-3-10, gear; 3-4, crane; 3-5, power unit; 3-6, crane guardrail assembly; 3-6-1, panel; 3-6-2, guardrail elbow; 3-6-3, guardrail vertical pipe; 3-6-4, guardrail horizontal pipe; 3-6-5, threaded plate; 3-6-6, welding plate; 3-6-7, bolt fasteners. DETAILED DESCRIPTION

[0037] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0039] The embodiment of the present invention discloses a rail-type flatbed crane loaded with a movable crane, such as Figure 1 As shown, it includes a rail flat car 1, an end wall assembly 2, and a movable crane device 3; the end wall assembly 2 is arranged at the edge of the rail flat car 1, and the movable crane device 3 is arranged above the end wall assembly.

[0040] like Figure 2 and Figure 3 As shown, the rail flat car includes an underframe 1-1, a bogie 1-2, a braking device 1-3, a coupler buffer device 1-4, a rail grabber 1-5, a fixed freight bogie 1-6, a mobile freight bogie 1-7, a hook fixing device 1-8, and a tool box 1-9; the bogie 1-2 and the braking device 1-3 are arranged below the underframe 1-1 for steering and braking of the vehicle; the front end of the underframe 1-1 is provided with a coupler buffer device 1-4 for connection and buffering between rail flat cars; the bogie 1-2, the braking device 1-3 and the coupler buffer device 1-4 can adopt the structure in the prior art; the rail grabber 1-5 is arranged below the underframe 1-1, and there are four rail grabbers 1-5, which are respectively arranged at the four corners of the underframe 1-1 to increase the anti-overturning performance of the vehicle to ensure the stability of the rail flat car when the movable crane device is operating. A fixed freight bogie 1-6 and a floating freight bogie 1-7 are arranged on the upper part of the chassis 1-1. The fixed freight bogie 1-6 and the floating freight bogie 1-7 are both connected to the vehicle body by bolts, which are convenient for installation, disassembly and maintenance. The floating freight bogie 1-7 can rotate with the long rails along the line curve, which can reduce the lateral force generated by the long rails when the vehicle passes the curve and avoid vehicle derailment. A hook fixing device 1-8 is also arranged above the chassis 1-1. The hook fixing device 1-8 is a U-shaped steel bar, which is fixedly connected to the chassis 1-1 by welding and is used to fix the hook of the movable crane device to ensure that the crane arm does not invade the line limit during vehicle operation; a tool box 1-9 is arranged below the rail flat car 1 for placing tool kits and rigging.

[0041] like Figure 4 As shown, the end wall assembly includes an end door assembly 2-1 and an end stop assembly 2-2; Figure 5 As shown, the end door assembly 2-1 includes an end door steel frame 2-1-1, a hinge 2-1-2, a hinge seat 2-1-3, a stop iron 2-1-4 and a rod seat 2-1-5. The end door steel frame 2-1-1 is provided with a rod seat 2-1-5 for connecting the rod 2-2-2. The end door steel frame 2-1-1 is also provided with a hinge 2-1-2. The hinge 2-1-2 is connected to the hinge seat 2-1-3 through a pin 2-2-5. The hinge 2-1-2 can be flexibly turned up and down, and the end door can be locked by relying on the stop iron 2-1-4. Figure 6As shown, in order to increase the cargo loading capacity of the rail flatbed crane, an end stop assembly 2-2 is provided. The end stop assembly 2-2 includes a support 2-2-1, a plug rod 2-2-2, an end plate 2-2-3, a guardrail 2-2-4, a pin 2-2-5 and a β pin 2-2-6. The support 2-2-1 and the plug rod 2-2-2 are both made of channel steel, the end plate 2-2-3 is made of steel plate bent into a variable cross-section channel structure, and the guardrail 2-2-4 is made of round tube bent. The end stop assembly 2-2 includes a left end stop and a right end stop, which are mirror images of each other. The end block assembly 2-2 is connected to the end door assembly 2-1 by plugging the plug rod 2-2-2 into the plug rod seat 2-1-5. During installation, the plug rod 2-2-2 is inserted into the plug rod seat 2-1-5, and the guardrail 2-2-4 is inserted into the plug rod 2-2-2, and the pin shaft 2-2-5 and the β pin 2-2-6 are used for protection and fixation. When the rail flatbed crane is marshaled to transport long rails, the end block can be easily removed, and the end door can be laid down, and the end door can act as a ferry. When transporting bulk goods or other engineering components, the end block can be installed to increase the end wall height and increase the cargo capacity.

[0042] like Figure 7 As shown, the movable crane device 3 includes a guide rail assembly 3-1, a column plug assembly 3-2, a mobile platform 3-3, a crane 3-4, a power unit 3-5 and a crane guardrail assembly 3-6; the movable crane device is installed as a whole on the rail flat car frame 1-1, the guide rail assembly 3-1 is connected to the rail flat car 1 through the column plug assembly 3-2, a mobile platform is arranged above the guide rail assembly 3-1, and a crane, a power unit and a crane guardrail assembly are arranged on the mobile platform; the power unit 3-5 provides the kinetic energy required for the mobile platform 3-3 and the crane 3-4 to work.

[0043] like Figure 8As shown, the guide rail assembly 3-1 includes a side wall 3-1-1, a rack guide rail 3-1-2, a stopper 3-1-3 and a sensor 3-1-4. The side wall 3-1-1 is a channel steel structure and acts as a enclosure together with the end wall assembly 2 to accommodate goods. The upper part of the rack guide rail 3-1-2 is a straight rack and the lower part is a concave surface slide. The side wall 3-1-1 is connected to the rack guide rail 3-1-2 by bolts. Stoppers 3-1-3 and sensors 3-1-4 are provided at both ends of the rack guide 3-1-2. The stoppers 3-1-3 are inserted into the ends of the rack guide 3-1-2 and fixed to the rack guide 3-1-2 through the pins 2-2-5, playing a role of mechanical limit. The sensors 3-1-4 can monitor the position of the mobile platform. When the mobile platform is close to the ends of the rack guide 3-1-2, the sensors 3-1-4 can feed back signals to the control unit, thereby braking the mobile platform. The two play a double insurance role, which can prevent the mobile platform 3-3 from sliding out of the guide rail. The column plug assembly 3-2 includes a column socket 3-2-1, a column plug 3-2-2 and a connector 3-2-3. The connector 3-2-3 is welded to the side wall 3-1-1, and the column plug 3-2-2 is welded to the connector 3-2-3. A lifting ear 3-3-2 is provided on the column plug 3-2-2 to facilitate the lifting of the guide rail assembly 3-1. The column socket 3-2-1 is welded on the side beam of the chassis 1-1, and the guide rail assembly 3-1 is connected to the vehicle body chassis 1-1 through multiple column plug assemblies 3-2. The column plug 3-2-2 and the column socket 3-2-1 are fixed and protected by the pin shaft 2-2-5, which reduces the connection or installation difficulty of the guide rail assembly 3-1 and the traditional flat car. In other embodiments, the connection between the connector 3-2-3 and the side wall 3-1-1, and the column socket 3-2-1 and the side beam of the vehicle body chassis 1-1 can also be connected by bolts or other connection methods.

[0044] like Figure 9-11As shown, the mobile platform 3-3 includes a mobile platform floor 3-3-1, a lifting lug 3-3-2, a slider body 3-3-3, a crane mounting seat 3-3-4, a mobile platform bearing frame 3-3-5, a transmission shaft 3-3-6, a gear box 3-3-7, a motor 3-3-8, a motor mounting seat 3-3-9 and a gear 3-3-10. The slider body 3-3-3 is a groove-shaped structure, and both inner sides are convex surfaces. The slider body 3-3-3 can slide back and forth on the rack guide rail 3-1-2. The mobile platform bearing frame 3-3-5 is mainly composed of a frame structure of steel components such as channel steel and I-beam, and both sides are welded to the slider body 3-3-3. The motor has forward and reverse rotation functions, and can drive the gear 3-3-10 to roll back and forth on the rack guide 3-1-2 through the gear box 3-3-7 and the transmission shaft 3-3-6, thereby driving the slider body 3-3-3, the mobile platform carrier frame 3-3-5 and the entire mobile platform to move back and forth on the rack guide 3-1-2. The motor can draw power from the power unit 3-5. The movement, stop and other actions of the mobile platform 3-3 can be controlled by the control unit and the wireless remote control.

[0045] The crane 3-4 described in this embodiment is a hydraulic crane, which can adopt the existing mature structure, and its structure will not be introduced in detail. The crane 3-4 is installed on the crane mounting seat 3-3-4 by bolts. The power unit 3-5 includes a diesel engine, a generator, a hydraulic system, a control unit, etc., and each component is integrated in an independent box. The various components of the power unit can adopt the existing mature structure. The kinetic energy of the crane 3-4 comes from the power unit, and the telescopic, rotating and other actions of the crane 3-4 can be achieved through the control unit and wireless remote control. The crane 3-4 can also be an electric crane 3-4, and the power unit can be cancelled. Only the control box needs to be retained. The power supply of the electric crane 3-4 comes from the available power supply on the traction locomotive or the subway line. Those skilled in the art can design it according to actual needs.

[0046] In this embodiment, in order to prevent the cargo from colliding with the crane 3-4 during driving and loading and unloading, a crane guardrail assembly 3-6 is provided on the mobile platform 3-3 around the crane 3-4. Figure 12-13 As shown. The crane guardrail assembly includes a panel 3-6-1, a guardrail bend 3-6-2, a guardrail vertical pipe 3-6-3, a guardrail horizontal pipe 3-6-4, a threaded plate 3-6-5, a welding plate 3-6-6 and bolt fasteners 3-6-7. Among them, the guardrail bend, guardrail vertical pipe and guardrail horizontal pipe are all made of round pipes. The threaded plate 3-6-5 is welded to the mobile platform floor 3-3-1, the guardrail vertical pipe 3-6-3 and the guardrail bend 3-6-2 are welded to the welding plate 3-6-6, and the welding plate 3-6-6 is connected to the threaded plate 3-6-5 by bolt fasteners 3-6-7. This connection method is convenient for installation and disassembly.

[0047] The movable crane device 3 in this embodiment is as follows: Figure 7 As shown, it can be conveniently and quickly installed on an existing rail flat car, with little modification to the existing rail flat car. It is only necessary to weld a corresponding number of column sockets 3-2-1 on the side beams of the existing rail flat car chassis 1-1. The column sockets 3-2-1 can be fixed to the rail flat car by bolting with a slight modification in structure. The modification is simple and basically does not affect the existing steel structure of the flat car. It has high compatibility and strong versatility. Optionally, if the existing flat car needs to be installed with the end wall assembly 2 of the present invention, including the end door assembly 2-1 and the end stop assembly 2-2, it is only necessary to weld the matching folding seat 2-1-3 on the end beam of the existing flat car chassis 1-1, as shown in FIG. Figure 5 As shown, as well as the end door bracket 1-1-1 and the guardrail support plate 1-1-2, as shown Figure 2 shown.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rail-type flatbed crane for loading a movable crane, characterized in that: It includes a rail flat car, an end wall assembly and a movable crane device. At least four rail grabbers are installed at the bottom of the rail flat car, and a fixed freight bogie, a floating freight bogie and a hook fixing device are installed at the top of the rail flat car; a tool box is also provided at the bottom of the rail flat car; End wall assemblies are arranged at both ends of the rail flat car, and the end wall assemblies include end door assemblies and end stop assemblies; the end stop assemblies are plug-in mounted on the end door assemblies, and the end door assemblies are rotatably mounted on the rail flat car; A movable crane device is also provided above the rail flat car, and the movable crane device includes a guide rail assembly, a column plug assembly, a mobile platform, and a crane; the guide rail assembly is arranged on both sides of the rail flat car and is installed on the rail flat car through the column plug assembly, a mobile platform is installed above the guide rail assembly, and a crane is provided on the mobile platform; the end wall assembly is connected to the rail flat car through a hinge and a hinge seat, and the movable crane device is connected to the rail flat car through the column plug assembly.

2. A rail-mounted flatbed crane for loading a movable crane as claimed in claim 1, characterized in that: The mobile platform is also provided with a power unit, a crane guardrail and a wireless remote control component.

3. A rail-type flatbed crane for loading a movable crane as claimed in claim 1, characterized in that: The end door assembly includes an end door steel frame, a hinge, a hinge seat, a stop iron and a rod insertion seat. The end door steel frame is provided with a rod insertion seat, and the end door steel frame is also provided with a hinge. The hinge is connected to the hinge seat through a pin shaft, and the hinge seat is fixedly connected to the rail flat car.

4. A rail-type flatbed crane for loading a movable crane as claimed in claim 3, characterized in that: The end stop assembly includes a plunger and an end plate, wherein the end plate is arranged on the plunger, a detachable guardrail is also installed on the plunger, the plunger is installed on the plunger seat, and a pin shaft and a β pin are provided for protection and fixing.

5. A rail-mounted flatbed crane for loading a movable crane as claimed in claim 4, characterized in that: The end stop assembly comprises a left end stop and a right end stop, which are mirror images of each other and are respectively plugged into the end door assembly through plug rods.

6. A rail-mounted flatbed crane for loading a movable crane as claimed in claim 1, characterized in that: The guide rail assembly includes a side wall, a rack guide rail, a stopper and a sensor; the side wall adopts a channel steel structure, the upper part of the rack guide rail is a straight rack, and the lower part is a concave slide groove structure; the rack guide rail is connected to the side wall by bolts, the stopper is installed on the rack guide rail, and the sensor is installed on the stopper.

7. A rail-mounted flatbed crane for loading a movable crane as claimed in claim 1, characterized in that: The column plug assembly includes a connector, a column plug and a column socket; a lifting lug is arranged on the column plug, the connector is welded to the side wall, the column socket is welded to the underframe of the rail flat car, and a pin shaft protection is arranged between the column plug and the column socket.

8. A rail-mounted flatbed crane for loading a movable crane as claimed in claim 1, characterized in that: The mobile platform includes a mobile platform floor, lifting ears, a slider body, a crane mounting seat, and a mobile platform bearing frame; the slider body is a groove-shaped structure and both inner side surfaces are convex; lifting ears are provided at both ends of the slider body; the mobile platform bearing frame is a frame structure of steel components, and both sides of the mobile platform bearing frame are welded to the slider body; a mobile platform floor is provided above the mobile platform bearing frame; and a crane mounting seat is provided on the mobile platform floor.

9. A rail-mounted flatbed crane for loading a movable crane as claimed in claim 1, characterized in that: The mobile platform is provided with a transmission shaft, a gear box, a motor and a gear; the motor has forward and reverse rotation functions, and the motor drives the gear to roll on the rack guide rail through the gear box and the transmission shaft; the motor is connected to the control unit of the wireless remote control.

10. A rail-mounted flatbed crane for loading a movable crane as claimed in claim 1, characterized in that: The crane guardrail assembly and the mobile platform are detachably connected, which is convenient for installation and disassembly.

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