Heavy-load rail liftable flat car

Abstract

The invention provides a heavy-load rail liftable flatcar which comprises a lifting platform deck, a lifting mechanism and a rail, the lifting platform deck is used for bearing heavy objects, the lifting mechanism is movably arranged on the rail, and the lifting mechanism is used for driving the lifting platform deck to do lifting action; the lifting mechanism comprises a lifting driving assembly, a first supporting arm assembly and a second supporting arm assembly, the first supporting arm assembly and the second supporting arm assembly are arranged in the extending direction of the track in a spaced mode, and one end of the first supporting arm assembly and one end of the second supporting arm assembly are rotationally connected to the lower portion of the lifting carrying table. The other ends of the first supporting arm assembly and the second supporting arm assembly are slidably connected to the upper portion of the rail, and the lifting driving assembly is used for driving the other ends of the first supporting arm assembly and the second supporting arm assembly to move in the face-to-face or back-to-back mode. The lifting platform deck is supported by the first supporting arm assembly and the second supporting arm assembly, vibration conducted to the lifting driving assembly can be effectively reduced, damage to the lifting driving assembly due to long-time use is avoided, the risk is reduced, the service life is prolonged, and the use requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a heavy-duty rail-mounted liftable flat car. Background Art

[0002] Flat cars are mainly used to transport goods with relatively large volume or weight, such as steel, wood, automobiles, and mechanical equipment. According to their uses, flat cars can be divided into general-purpose flat cars and container special-purpose flat cars. General-purpose flat cars are mainly used to transport large goods such as steel and wood, while container special-purpose flat cars are specifically used for container transportation. Flat cars have the advantages of simple structure, convenient use, easy maintenance, large load-bearing capacity, and less pollution, and are widely used in machine manufacturing and metallurgical factories for transporting heavy objects across bays inside the workshop in cooperation with overhead cranes. Chinese Patent CN204980130U discloses a hydraulic lift electric flat car, which includes a frame, a flat car traveling mechanism installed on the frame, a rotating platform for rotating and transporting goods, and a lifting cargo platform for further lifting and transporting goods. A linear guide rail is installed at the bottom of the frame, and the flat car traveling mechanism and the lifting cargo platform are installed on the linear guide rail. The lifting cargo platform includes a platform at the top and a hydraulic cylinder located below the platform. A plurality of hydraulic cylinders are arranged side by side below the platform. In the above patent, the platform is driven by the hydraulic cylinder to lift. The hydraulic cylinder is used for both lifting and supporting heavy objects, and the output end of the hydraulic cylinder is directly in contact with the platform. With this structural design, during the loading and unloading of heavy objects, certain impact vibrations will be generated, and the vibrations will be transmitted to the output end of the hydraulic cylinder. Prolonged use will damage the hydraulic cylinder, causing danger and not meeting the usage requirements. Summary of the Invention

[0003] The purpose of the present invention is to provide a heavy-duty rail-mounted liftable flat car, which can effectively reduce the vibration transmitted to the hydraulic cylinder, so as to avoid danger caused by prolonged use and meet the usage requirements.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions: An embodiment of the present invention provides a heavy-duty rail-mounted liftable flat car, which includes a lifting platform, a lifting mechanism, and a track. The lifting platform is used to carry heavy objects. The lifting mechanism is movably arranged on the track and is used to drive the lifting platform to perform a lifting action. The lifting mechanism includes a lifting drive assembly, a first arm assembly, and a second arm assembly. The first arm assembly and the second arm assembly are arranged at intervals along the extending direction of the track. One ends of the first arm assembly and the second arm assembly are respectively rotatably connected to the lower part of the lifting platform, and the other ends of the first arm assembly and the second arm assembly are respectively slidably connected above the track. The lifting drive assembly is used to drive the other ends of the first arm assembly and the second arm assembly to move towards or away from each other.

[0005] Preferably, the track includes two guide rails arranged at intervals from each other. The first arm assembly includes a first connecting shaft and two interconnected first arms. One ends of the two first arms are respectively rotatably connected to the lower part of the lifting platform through the first connecting shaft, and the other ends of the two first arms are respectively slidably connected to the two guide rails; the second arm assembly includes a second connecting shaft and two interconnected second arms. One ends of the two second arms are respectively rotatably connected to the lower part of the lifting platform through the second connecting shaft, and the other ends of the two second arms are respectively slidably connected to the two guide rails.

[0006] Preferably, the lifting drive assembly includes a first telescopic drive device and two connecting rod assemblies. The fixed end of the first telescopic drive device is rotatably connected to the first connecting shaft, and the telescopic end of the first telescopic drive device is rotatably connected to the second connecting shaft; a connecting rod assembly is connected between the first arm and the second arm located on the same guide rail; the connecting rod assembly includes a first connecting rod and a second connecting rod. One end of the first connecting rod is hinged to one end of the second connecting rod, the other end of the first connecting rod is hinged to the first arm, and the other end of the second connecting rod is hinged to the second arm.

[0007] Preferably, the lifting drive assembly further includes a second telescopic drive device. The fixed end of the second telescopic drive device is rotatably connected to the second connecting shaft, and the telescopic end of the second telescopic drive device is rotatably connected to the first connecting shaft.

[0008] Preferably, the first connecting rod and the second connecting rod are hinged through a guiding pivot. The guiding pivot is slidably connected to the lower part of the lifting platform along the lifting direction of the lifting platform.

[0009] Preferably, two connecting seats are installed under the lifting platform. The two connecting seats are arranged on the outer sides of the two first arms and the two second arms along the distribution direction of the two guide rails. Guide chutes are respectively arranged on the opposite sides of the two connecting seats, and the guiding pivot is slidably connected in the guide chutes.

[0010] Preferably, a first roller is connected between the first arm and the guide rail, and a second roller is connected between the second arm and the guide rail.

[0011] Preferably, the heavy-duty rail-mounted liftable flat car further includes a traveling drive device and a transmission assembly. The traveling drive device is arranged on the first arm, and the traveling drive device is used to drive the transmission assembly to drive the first roller to rotate, so that the first roller moves along the guide rail.

[0012] Preferably, the traveling drive device includes a motor, and the transmission assembly includes a transmission shaft, a first chain and sprocket assembly, and a second chain and sprocket assembly. The transmission shaft is arranged on the first arm, the motor drives the first chain and sprocket assembly to drive the transmission shaft to rotate, and the transmission shaft drives the first roller to rotate through the second chain and sprocket assembly.

[0013] Preferably, the first telescopic driving device includes a hydraulic cylinder, a pneumatic cylinder or an electric push rod, and the second telescopic driving device includes a hydraulic cylinder, a pneumatic cylinder or an electric push rod.

[0014] Compared with the prior art, the beneficial effects of a heavy-duty rail-mounted liftable flat car provided by the present invention are as follows: For the heavy-duty rail-mounted liftable flat car of the present invention, by providing a first arm assembly and a second arm assembly, one end of the first arm assembly and the second arm assembly connected to the track can move towards or away from each other under the drive of the lifting drive assembly, so as to realize the rising and falling of the lifting platform. Since the lifting drive assembly is only used to drive the lifting actions of the first arm assembly and the second arm assembly, and the lifting platform is supported by the first arm assembly and the second arm assembly, when loading and unloading heavy objects, the vibration can be effectively reduced from being transmitted to the lifting drive assembly, thereby avoiding damage to the lifting drive assembly caused by long-term use, further reducing risks, prolonging the service life, and meeting the use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a top view schematic diagram of the structure of the heavy-duty rail-mounted liftable flat car provided by the embodiment of the present invention; Figure 2 It is a front view cross-sectional schematic diagram of the structure of the heavy-duty rail-mounted liftable flat car provided by the embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of the connecting seat provided by the embodiment of the present invention; Figure 4 It is a schematic diagram of the structure of the first arm and the second arm provided by the embodiment of the present invention.

[0017] Reference numerals: 10. Lifting platform; 11. Guide rail; 12. First connecting shaft; 13. First arm; 14. Second connecting shaft; 15. Second arm; 16. First cross beam; 17. Second cross beam; 18. First telescopic driving device; 19. First connecting rod; 20. Second connecting rod; 21. Guide pivot; 22. Connecting seat; 23. Guide chute; 24. First roller; 25. Second roller; 26. Second telescopic driving device; 27. Motor; 28. Transmission shaft; 29. First double-row sprocket; 30. First double-row chain; 31. Second double-row sprocket; 32. First single-row sprocket; 33. First single-row chain; 34. Second single-row sprocket; 35. Channel steel. Detailed Implementation Modes

[0018] In the following description, for the purpose of illustration rather than limitation, specific details such as specific system architectures, technologies, etc. are presented to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present invention. Embodiment 1

[0019] Please refer to Figures 1 to 4 As shown, a heavy-duty rail-mounted liftable flat car provided by an embodiment of the present invention will be described. The heavy-duty rail-mounted liftable flat car includes a lifting platform 10, a lifting mechanism, and a track. The lifting platform 10 is used to carry heavy objects. The lifting mechanism is movably arranged on the track and is used to drive the lifting platform 10 to perform lifting actions. The lifting mechanism includes a lifting drive assembly, a first arm assembly, and a second arm assembly. The first arm assembly and the second arm assembly are arranged at intervals along the extension direction of the track. One ends of the first arm assembly and the second arm assembly are respectively rotatably connected to the lower part of the lifting platform 10, and the other ends of the first arm assembly and the second arm assembly are respectively slidably connected above the track. The lifting drive assembly is used to drive the first arm assembly and the second arm assembly to move towards or away from each other. It can be understood that the track is used to provide support and walking guidance for the liftable flat car, and the first arm assembly and the second arm assembly can move along the track. When the lifting drive assembly drives the ends of the first arm assembly and the second arm assembly connected to the track to move towards each other, the ends of the first arm assembly and the second arm assembly connected to the track approach each other, and the lifting platform 10 rises. When the lifting drive assembly drives the ends of the first arm assembly and the second arm assembly connected to the track to move away from each other, the ends of the first arm assembly and the second arm assembly connected to the track move away from each other, and the lifting platform 10 descends. Since the lifting drive assembly is only used to drive the lifting actions of the first arm assembly and the second arm assembly, and the lifting platform 10 is supported by the first arm assembly and the second arm assembly, during the loading and unloading of heavy objects, the vibration can be effectively reduced from being transmitted to the lifting drive assembly, thereby avoiding damage to the lifting drive assembly caused by long-term use, reducing risks, extending the service life, and meeting the usage requirements.

[0020] Among them, referring to Figure 1 and Figure 2As shown in the figure, the track includes two guide rails 11 arranged at intervals. The first arm assembly includes a first connecting shaft 12 and two interconnected first arms 13. One ends of the two first arms 13 are respectively rotatably connected to the lower part of the lifting platform 10 through the first connecting shaft 12, and the other ends of the two first arms 13 are respectively slidably connected to the two guide rails 11. The second arm assembly includes a second connecting shaft 14 and two interconnected second arms 15. One ends of the two second arms 15 are rotatably connected to the lower part of the lifting platform 10 through the second connecting shaft 14, and the other ends of the two second arms 15 are respectively slidably connected to the two guide rails 11. Specifically, the two guide rails 11 are arranged in parallel. One first arm 13 and one second arm 15 are located above one of the guide rails 11 and can move along this guide rail 11, and the other first arm 13 and the other second arm 15 are located above the other guide rail 11 and can move along this guide rail 11. The two first arms 13 are connected by a first cross beam 16. The first connecting shaft 12 passes through the two first arms 13 and is fixedly connected to the two first arms 13. The rotation of the first connecting shaft 12 can drive the two first arms 13 to rotate synchronously. The two second arms 15 are connected by a second cross beam 17. The second connecting shaft 14 passes through the two second arms 15 and is fixedly connected to the two second arms 15. The rotation of the second connecting shaft 14 can drive the two second arms 15 to rotate synchronously, and the rotation directions of the second arm 15 and the first arm 13 are opposite. The lifting drive assembly includes a first telescopic drive device 18 and two link assemblies. The fixed end of the first telescopic drive device 18 is rotatably connected to the first connecting shaft 12, and the telescopic end of the first telescopic drive device 18 is rotatably connected to the second connecting shaft 14. A link assembly is connected between the first arm 13 and the second arm 15 located on the same guide rail 11. The link assembly includes a first link 19 and a second link 20. One end of the first link 19 is hinged to one end of the second link 20, the other end of the first link 19 is hinged to the first arm 13, and the other end of the second link 20 is hinged to the second arm 15, as Figure 4 shown. Specifically, the first connecting shaft 12 is connected between the two ends of the first arm 13, the second connecting shaft 14 is connected between the two ends of the second arm 15, the first link 19 is connected to the upper end of the first arm 13 (i.e., the end close to the lifting platform 10), the second link 20 is connected to the upper end of the second arm 15 (i.e., the end close to the lifting platform 10). The first telescopic drive device 18 includes a hydraulic cylinder, a pneumatic cylinder or an electric push rod. The first telescopic drive device 18 drives the first connecting shaft 12 and the second connecting shaft 14 to rotate synchronously in opposite directions through the output of linear motion, so that the first arm 13 and the second arm 15 rotate synchronously in opposite directions and move away from or close to each other to realize the lifting control of the lifting platform 10. As Figure 1 , Figure 3 and Figure 4As shown, the first connecting rod 19 and the second connecting rod 20 are hinged by a guiding pivot 21. The guiding pivot 21 is slidably connected to the lower part of the lifting platform 10 along the lifting direction of the lifting platform 10. Through the above arrangement, the deflection of the first connecting rod 19 and the second connecting rod 20 can be avoided, so that the lifting platform 10 rises and falls in the vertical direction. Specifically, two connecting seats 22 are installed under the lifting platform 10. The two connecting seats 22 are arranged outside the two first support arms 13 and the two second support arms 15 along the distribution direction of the two guide rails 11. Guide chutes 23 are respectively arranged on the opposite sides of the two connecting seats 22. The guiding pivot 21 is slidably connected in the guide chute 23, as Figure 1 , Figure 2 and Figure 3 shown. Among them, the first connecting shaft 12 and the second connecting shaft 14 both pass through between the two connecting seats 22. The first connecting shaft 12 and the second connecting shaft 14 are respectively rotatably connected to each connecting seat 22 and are arranged parallel to each other. In addition, a first roller 24 is connected between the first support arm 13 and the guide rail 11, and a second roller 25 is connected between the second support arm 15 and the guide rail 11. The first roller 24 is installed under the first support arm 13, and the second roller 25 is installed under the second support arm 15. The first roller 24 and the second roller 25 are respectively slidably connected to the guide rail 11 where they are located. By setting the first roller 24 and the second roller 25, it is convenient for the lifting platform 10 to move along the track. To further ensure the synchronous rotation of the first support arm assembly and the second support arm assembly so that the lifting platform 10 can be lifted and lowered smoothly, preferably, as Figure 1 and Figure 4 shown, the lifting drive assembly further includes a second telescopic drive device 26. The fixed end of the second telescopic drive device 26 is rotatably connected to the second connecting shaft 14, and the telescopic end of the second telescopic drive device 26 is rotatably connected to the first connecting shaft 12. The second telescopic drive device 26 includes a hydraulic cylinder, a pneumatic cylinder or an electric push rod. The second telescopic drive device 26 and the first telescopic drive device 18 are symmetrically arranged about the center of the lifting platform 10, so that the first support arm assembly and the second support arm assembly are evenly stressed and the stability of the lifting platform 10 is ensured. Embodiment 2

[0021] See Figure 1 , Figure 3 and Figure 4As shown in the figure, the overloaded rail-mounted liftable flat car further includes a traveling drive device and a transmission assembly. The traveling drive device is arranged on the first support arm 13. The traveling drive device is used to drive the transmission assembly to drive the first roller 24 to rotate, so that the first roller 24 moves along the guide rail 11. By setting the traveling drive device and the transmission assembly, the combination of the traveling drive device and the transmission assembly can drive the first roller 24 to rotate, realize the movement of the first roller 24 and drive the second roller 25 to move along the guide rail 11, so that without excessive labor costs, the movement of the liftable flat car can be easily and efficiently realized, a large amount of labor is saved, and the movement efficiency is improved. Preferably, the traveling drive device includes a motor 27, and the transmission assembly includes a transmission shaft 28, a first chain and sprocket assembly, and a second chain and sprocket assembly. The transmission shaft 28 is arranged on the first support arm 13. The motor 27 drives the first chain and sprocket assembly to drive the transmission shaft 28 to rotate, and the transmission shaft 28 drives the first roller 24 to rotate through the second chain and sprocket assembly. Specifically, the first chain and sprocket assembly includes a first double-row sprocket 29, a first double-row chain 30 and a second double-row sprocket 31. Both the transmission shaft 28 and the motor 27 are arranged on the first support arm 13. The transmission shaft 28 is arranged along the extension direction of the guide rail 11. The first double-row sprocket 29 is installed at the driving end of the motor 27. The second double-row sprocket 31 is connected between the two ends of the transmission shaft 28. The first double-row sprocket 29 and the second double-row sprocket 31 are connected by a first double-row chain 30. The motor 27 drives the first double-row sprocket 29 to rotate, and the first double-row sprocket 29 drives the transmission shaft 28 to rotate through the first double-row chain 30 and the second double-row sprocket 31. The second chain and sprocket assembly includes two first single-row sprockets 32, two first single-row chains 33 and two second single-row sprockets 34. The two first single-row sprockets 32 are respectively installed at the two ends of the transmission shaft 28. The two second single-row sprockets 34 are respectively connected to the rotating shafts of the two first rollers 24. The first single-row sprocket 32 and the second single-row sprocket 34 on the same side are connected by a first single-row chain 33. The rotation of the transmission shaft 28 drives the two first single-row sprockets 32 to rotate. The first single-row sprocket 32 drives the second single-row sprocket 34 to rotate through the first single-row chain 33 connected thereto, so as to drive the first roller 24 to rotate and realize the movement of the first roller 24 along the guide rail 11. In addition, a plurality of channel steels 35 are arranged below the lifting platform 10 to increase the support strength of the lifting platform 10.

[0022] The working principle of the above solution is as follows: There are two connecting seats 22 fixedly installed below the lifting platform 10 at intervals. The first connecting shaft 12 and the second connecting shaft 14 are parallel to each other and are respectively rotatably connected to the two connecting seats 22. The first telescopic driving device 18 is a first hydraulic cylinder. The piston rod of the first hydraulic cylinder is connected to the first support arm 13 through a hinge seat and a hinge shaft. The lower end of the first support arm 13 is equipped with a first roller 24 through an axle. The first roller 24 is slidably connected to a guide rail 11. The cylinder block of the first hydraulic cylinder is connected to the second connecting shaft 14 through a bushing. The second telescopic driving device 26 is a second hydraulic cylinder. The piston rod of the second hydraulic cylinder is connected to the second support arm 15 through a hinge seat and a hinge shaft. The lower end of the second support arm 15 is equipped with a second roller 25 through an axle. The second roller 25 is slidably connected to another guide rail 11. The cylinder block of the second hydraulic cylinder is connected to the first connecting shaft 12 through a bushing. Among them, between the first support arm 13 and the second support arm 15 located on the same guide rail 11, they are hinged to the first connecting rod 19 and the second connecting rod 20 that are hinged to each other to form a triangular hinge movement, so that the lifting platform 10 can be raised or lowered.

[0023] When adjusting the height of the heavy-duty rail-mounted liftable flat car, the first hydraulic cylinder and the second hydraulic cylinder are started simultaneously. When the piston rods of the two hydraulic cylinders extend, the first connecting shaft 12 drives the first support arm 13 to rotate, and the end of the first support arm 13 connected with the first roller 24 moves along the guide rail 11 towards the direction close to the second support arm 15 through the first roller 24. The second connecting shaft 14 drives the second support arm 15 to rotate synchronously, and the end of the second support arm 15 connected with the second roller 25 moves along the guide rail 11 towards the direction close to the first support arm 13 through the second roller 25. At this time, the lifting platform 10 rises. When the piston rods of the two hydraulic cylinders contract, the first connecting shaft 12 drives the first support arm 13 to rotate, and the end of the first support arm 13 connected with the first roller 24 moves along the guide rail 11 towards the direction away from the second support arm 15 through the first roller 24. The second connecting shaft 14 drives the second support arm 15 to rotate synchronously, and the end of the second support arm 15 connected with the second roller 25 moves along the guide rail 11 towards the direction away from the first support arm 13 through the second roller 25. At this time, the lifting platform 10 descends. By controlling the piston rods of the first hydraulic cylinder and the second hydraulic cylinder to extend or contract simultaneously, the first support arm assembly and the second support arm assembly can move synchronously, so as to realize the stable lifting and lowering of the control of the lifting platform 10.

[0024] When the heavy-duty rail-mounted liftable flat car needs to move, the motor 27 is started. The motor 27 drives the first double-row sprocket 29 to rotate and drives the transmission shaft 28 to rotate through the first double-row chain 30 and the second double-row sprocket 31. The transmission shaft 28 drives the second single-row sprocket 34 to rotate through the first single-row sprocket 32 and the first single-row chain 33, so as to realize the first roller 24 driving the second roller 25 to move along the guide rail 11.

[0025] As can be seen from the above technical solutions, the present invention has at least the following advantages and positive effects: (1) Since the first telescopic driving device 18 and the second telescopic driving device 26 are only used to drive the lifting actions of the first arm 13 and the second arm 15, and the lifting platform 10 is supported by the first arm 13 and the second arm 15, when loading and unloading heavy objects, the vibration conduction to the first telescopic driving device 18 and the second telescopic driving device 26 can be effectively reduced, thereby avoiding damage to the first telescopic driving device 18 and the second telescopic driving device 26 caused by long-term use, further reducing risks, prolonging the service life, and meeting the usage requirements; (2) The first telescopic driving device 18 and the second telescopic driving device 26 are symmetrically arranged about the center of the lifting platform 10, so that the first arm assembly and the second arm assembly are evenly stressed, ensuring the stability of the lifting platform 10; (3) By providing a traveling driving device and a transmission assembly, the combination of the traveling driving device and the transmission assembly can drive the first roller 24 to rotate, realize the movement of the first roller 24 and drive the second roller 25 to move along the guide rail 11, so that without excessive labor costs, the movement of the lifting flat car can be easily and efficiently realized, saving a large amount of labor and improving the moving efficiency.

[0026] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. An overloaded rail-mounted liftable flat car, characterized in that, It includes a lifting platform, a lifting mechanism and a track. The lifting platform is used to carry heavy objects. The lifting mechanism is movably arranged on the track and is used to drive the lifting platform to perform lifting actions. The lifting mechanism includes a lifting drive assembly, a first arm assembly and a second arm assembly. The first arm assembly and the second arm assembly are arranged at intervals along the extension direction of the track. One ends of the first arm assembly and the second arm assembly are respectively rotatably connected to the lower part of the lifting platform, and the other ends of the first arm assembly and the second arm assembly are respectively slidably connected to the upper part of the track. The lifting drive assembly is used to drive the other ends of the first arm assembly and the second arm assembly to move towards or away from each other.

2. The heavy-duty rail-mounted liftable flat car according to claim 1, wherein The track includes two guide rails arranged at intervals. The first arm assembly includes a first connecting shaft and two interconnected first arms. One ends of the two first arms are respectively rotatably connected under the lifting platform through the first connecting shaft, and the other ends of the two first arms are respectively slidably connected to the two guide rails. The second arm assembly includes a second connecting shaft and two interconnected second arms. One ends of the two second arms are respectively rotatably connected under the lifting platform through the second connecting shaft, and the other ends of the two second arms are respectively slidably connected to the two guide rails.

3. The heavy-duty rail-mounted liftable flat car according to claim 2, characterized in that, The lifting drive assembly includes a first telescopic drive device and two connecting rod assemblies. The fixed end of the first telescopic drive device is rotatably connected to the first connecting shaft, and the telescopic end of the first telescopic drive device is rotatably connected to the second connecting shaft. One connecting rod assembly is connected between the first arm and the second arm located on the same guide rail. The connecting rod assembly includes a first connecting rod and a second connecting rod. One end of the first connecting rod is hinged to one end of the second connecting rod, the other end of the first connecting rod is hinged to the first arm, and the other end of the second connecting rod is hinged to the second arm.

4. The overloaded rail-mounted liftable flat car according to claim 3, wherein, The lifting drive assembly further includes a second telescopic drive device. The fixed end of the second telescopic drive device is rotatably connected to the second connecting shaft, and the telescopic end of the second telescopic drive device is rotatably connected to the first connecting shaft.

5. The overloaded rail-mounted liftable flat car according to claim 3 or 4, characterized in that, The first connecting rod and the second connecting rod are hinged through a guiding pivot. The guiding pivot is slidably connected under the lifting platform along the lifting direction of the lifting platform.

6. The heavy-duty rail-mounted liftable flat car according to claim 5, characterized in that, Two connecting seats are installed under the lifting platform. The two connecting seats are arranged outside the two first arms and the two second arms along the distribution direction of the two guide rails. Guide chutes are respectively arranged on the opposite sides of the two connecting seats, and the guiding pivot is slidably connected in the guide chutes.

7. The heavy-duty rail-mounted liftable flat car according to claim 2, characterized in that, A first roller is connected between the first arm and the guide rail, and a second roller is connected between the second arm and the guide rail.

8. The heavy-duty rail-mounted liftable flat car according to claim 7, wherein The heavy-duty rail-mounted liftable flat car further includes a traveling drive device and a transmission component. The traveling drive device is arranged on the first arm and is used to drive the transmission component to drive the first roller to rotate so that the first roller moves along the guide rail.

9. The overloaded rail-mounted liftable flat car according to claim 8, characterized in that, The walking drive device includes a motor. The transmission assembly includes a transmission shaft, a first chain and sprocket assembly, and a second chain and sprocket assembly. The transmission shaft is arranged on the first arm. The motor drives the first chain and sprocket assembly to drive the transmission shaft to rotate, and the transmission shaft drives the first roller to rotate through the second chain and sprocket assembly.

10. The heavy-duty rail-mounted liftable flat car according to claim 4, characterized in that, The first telescopic drive device includes a hydraulic cylinder, a pneumatic cylinder or an electric push rod, and the second telescopic drive device includes a hydraulic cylinder, a pneumatic cylinder or an electric push rod.

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