A flatbed trailer

Abstract

The present invention discloses a flatbed truck for trailers, which relates to the technical field of mine machinery and equipment, and solves the technical problem in the prior art that the work efficiency of coal mines is affected by disassembling and assembling heavy equipment before transportation. It includes a frame body, at least two groups of suspension bodies and a number of wheel bodies, each group of suspension bodies is provided with a suspension connection part and a number of wheel mounting parts; the suspension connection parts of at least two groups of suspension bodies are respectively connected to the frame body, and the number of wheel bodies are respectively installed on the number of wheel mounting parts; the connection position of the suspension connection part and the frame body is lower than the connection position of the wheel mounting part and the wheel body. The flatbed truck of the present invention meets the design requirements of low height and heavy load, and has a strong load-bearing capacity while occupying a small height dimension. It can realize the overall non-disassembly transportation of heavy equipment in the low tunnels underground in coal mines, which greatly improves the withdrawal and installation efficiency of the comprehensive mining working face underground in coal mines, and improves the economic benefits of coal mines.

Description

Technical Field

[0001] The present invention relates to the technical field of mine mechanical equipment, in particular to a flatbed truck for a trailer. Background Art

[0002] Since the 1970s, my country has introduced underground fully mechanized mining equipment. In the early days, due to technical limitations, the cross-sectional height of the auxiliary transportation tunnels in most coal mines was relatively small. However, with the continuous development of underground large-height mining faces in recent years, fully mechanized mining equipment has become increasingly high-power, high-height, and intelligent. In order to adapt to the development of medium-thick fully mechanized mining faces, the size and weight of fully mechanized mining equipment have become larger and larger, which has caused difficulties in transporting fully mechanized mining equipment into the well and withdrawing and installing fully mechanized mining work.

[0003] At present, most coal mines adopt the method of disassembling large equipment, transporting them in parts and then assembling them. This does not meet the requirements of high efficiency of withdrawal and installation of comprehensive mining working faces. At the same time, large lifting equipment is required during the disassembly and assembly process, which wastes a lot of manpower, material and financial resources and affects the economic benefits of coal mines. Summary of the invention

[0004] In view of this, the purpose of the present invention is to overcome the shortcomings of the prior art and provide a flatbed truck for a trailer to solve the technical problem in the prior art that the working efficiency of coal mines is affected by disassembling and assembling heavy equipment before transportation.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A flatbed trailer includes a frame body, at least two sets of suspension bodies and a plurality of wheel bodies, wherein:

[0007] The frame body includes a plurality of longitudinal beams and cross beams connected to each other, and a towing device is arranged on the frame body;

[0008] Each group of the suspension bodies is provided with a suspension connection portion and a plurality of wheel mounting portions;

[0009] The suspension connection parts of at least two groups of the suspension bodies are respectively connected to the two side surfaces of the frame body facing away from each other, the wheel bodies are respectively installed on the wheel installation parts, the towing device is arranged at the front end of the frame body, and the suspension body is arranged at the rear end of the frame body opposite to the front end;

[0010] Wherein, the connection position between the suspension connection part and the frame body is lower than the connection position between the wheel mounting part and the wheel body.

[0011] On the basis of the above technical solution, the trailer flatbed can also be improved as follows.

[0012] Optionally, the towing device includes a hook with a bent direction toward the bottom of the frame body, the end of the frame body is connected to a vertical plate and a horizontal plate, the hook is connected to the vertical plate, the horizontal plate is detachably connected to a locking block located below the hook to prevent unhooking, and the vertical plate is provided with a guide port for aligning with a guide column of the trailer.

[0013] Optionally, a support frame and a support column that slides with the support frame are provided on the vertical plate, and a number of corresponding connection holes are respectively provided on the support frame and the support column, so that the support frame can drive the lifting of the frame body through the detachable connection between the support frame and the support column through the pin, and the vertical plate is also provided with a placement rack for storing the pin.

[0014] Optionally, the height of the longitudinal beam on the frame body is not less than the height of the cross beam, the upper surfaces of the longitudinal beam and the cross beam are flush, frame plates are provided on the upper surfaces of the longitudinal beam and the cross beam, and colinear suspension mounting holes are respectively provided on two groups of longitudinal beams at the edge of the frame body, and the suspension body is connected to the suspension mounting holes.

[0015] Optionally, the suspension body includes a connecting beam of a box-type structure and wheel frames symmetrically arranged at both ends of the connecting beam, the suspension connecting part is arranged on the connecting beam, the wheel mounting part is arranged on the wheel frame, and the wheel body includes a detachably connected tire and wheel hub.

[0016] Optionally, the suspension connecting part includes a suspension shaft and a first bearing for connecting the frame body and the suspension body, the suspension shaft is connected to the inner ring of the first bearing, the connecting beam on the suspension body is connected to the outer ring of the first bearing, and the suspension shaft is connected to the suspension mounting hole.

[0017] Optionally, a first bearing pad for fixing the first bearing is provided on the suspension shaft, a first shaft seal for sealing lubricating oil is provided between the first bearing pad and the connecting beam, and a first locking nut for preventing the first bearing pad from loosening is also provided on the suspension shaft.

[0018] Optionally, the wheel mounting portion includes a core shaft for connecting the wheel body and the suspension body and a second bearing, the core shaft is connected to the inner ring of the second bearing, the wheel body is connected to the outer ring of the second bearing, and the core shaft is connected to the wheel frame of the suspension body.

[0019] Optionally, a second bearing pad for fixing the second bearing is provided on the core shaft, a second shaft seal for sealing lubricating oil is provided between the second bearing pad and the wheel body, and a second locking nut, flange and baffle are also provided on the core shaft for preventing the second bearing pad from loosening.

[0020] Optionally, the frame body is also provided with a limit block for positioning the carrying device and a lifting ring for lifting the frame body.

[0021] Compared with the prior art, the trailer flatbed provided by the present invention has the following beneficial effects:

[0022] The frame body of the present invention adopts a beam structure, and the suspension body adopts a structural design of multiple wheel bodies, which improves the carrying capacity of the flatbed truck. At the same time, the position of the suspension connection part is designed to be lower than the position of the wheel mounting part, which reduces the height of the frame body, so that the flatbed truck meets the design requirements of low height and heavy load. It has a strong carrying capacity while occupying a small height dimension, and can realize the overall non-disassembly transportation of heavy equipment in the low tunnels underground in the coal mine, which greatly improves the withdrawal and installation efficiency of the comprehensive mining working face underground in the coal mine, and improves the economic benefits of the coal mine. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a structural schematic diagram of a flatbed truck for trailer according to an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 A front structural diagram of a frame body of a flatbed trailer;

[0026] Figure 3 yes Figure 2 A schematic diagram of the back structure of the frame body of the trailer flatbed truck;

[0027] Figure 4 yes Figure 1 A schematic diagram of the structure of the connection between the suspension body and the wheel body of the trailer flatbed truck;

[0028] Figure 5 yes Figure 4 A schematic cross-sectional view of the connection between the middle suspension body and the suspension shaft;

[0029] Figure 6 yes Figure 4 Schematic diagram of the cross-sectional structure of the connection between the middle hub and the core shaft.

[0030] In the figure:

[0031] 1—frame body; 101—frame plate; 102—longitudinal beam; 103—cross beam; 2—hook; 31—vertical plate; 32—cross plate; 4—locking block; 5—support frame; 6—support column; 7—placing frame; 8—latch pin; 9—guide port; 10—lifting ring; 11—suspension body; 111—suspension connecting part; 12—tire; 121—wheel mounting part; 13—suspension shaft; 14—first bearing; 15—first shaft seal; 16—first locking nut; 17—second bearing; 18—second shaft seal; 19—second locking nut; 20—wheel hub; 21—core shaft; 22—first bearing pad; 23—limiting block; 24—second bearing pad. DETAILED DESCRIPTION

[0032] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than comprehensive embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0033] Example:

[0034] A flatbed trailer, such as Figures 1 to 3 As shown, the vehicle frame body 1 includes three longitudinal beams 102 and a plurality of cross beams 103 as shown in the figure. The longitudinal beams 102 and the cross beams 103 are vertically connected to each other, and the connection method can be welding or bolt connection. Among them, the beam height of the longitudinal beam 102 is not less than the beam height of the cross beam 103. Optionally, the upper surfaces of the longitudinal beam 102 and the cross beam 103 are set to be flush with each other. Of course, the lower surfaces of the longitudinal beam 102 and the cross beam 103 can also be flush. A frame plate 101 made of high-strength steel plate is welded or bolted to the upper surfaces of the longitudinal beam 102 and the cross beam 103. Two limit blocks 23 are set on the surface of the frame plate 101. The two limit blocks 23 are used to position the corners of heavy equipment.

[0035] It is worth noting that in this embodiment, the number of longitudinal beams 102 is actually selected according to the width of the frame body 1 and is not limited to three; the number of cross beams 103 is actually selected according to the length of the frame body 1.

[0036] like Figures 1 to 3As shown, a vertical plate 31 made of a high-strength steel plate is welded or bolted to the crossbeam 103 at one end of the frame body 1, and two groups of hooks 2 symmetrically arranged and bent toward the bottom of the frame body 1 are welded or bolted to the vertical plate 31. The two groups of hooks 2 constitute a towing device for the frame body 1. Optionally, the hooks 2 are connected to a side of the vertical plate 31 facing the outside of the frame body 1. The hooks 2 are bent toward the bottom of the frame body 1, and when the towing hook of the trailer is towing, the pulling force is upward, which can prevent the towing hook from being unhooked.

[0037] It is understood that the towing device of the present invention is not limited to the structure of the hook 2, and can also be a chain, a connection hole or a connection slot set on the frame body 1, which will not be repeated here. The number of hooks 2 is not limited to two groups, and more groups can be selected according to the width of the frame body 1.

[0038] like Figures 1 to 3 As shown, a horizontal plate 32 located below the hook 2 is welded or bolted to the vertical plate 31 or the crossbeam 103 at the edge of the frame body 1, and a locking block 4 located directly below the hook 2 is detachably connected to the horizontal plate 32. Selecting locking blocks 4 of different heights according to the size of different trailer hooks can lock the trailer hook in the hook 2, thereby preventing the hook from being unhooked.

[0039] Specifically, the detachable connection structure of the horizontal plate 32 and the locking block 4 can be selected by opening corresponding holes on the horizontal plate 32 and the locking block 4, and the detachable connection between the horizontal plate 32 and the locking block 4 can be realized by passing a pin through the horizontal plate 32 and the locking block 4. Of course, a connection method in which a bolt cooperates with a threaded hole can also be adopted; or a connection groove is provided on the horizontal plate 32, and the locking block 4 is inserted into the connection groove.

[0040] like Figures 1 to 3 As shown, a guide opening 9 is provided on the vertical plate 31, which is located between two groups of symmetrically arranged hooks 2. The cross-sectional dimensions of the guide opening 9 are adapted to the cross-sectional dimensions of the guide column on the trailer. When the sight environment in the coal mine is poor, the guide opening 9 can be used to align and connect the trailer with the flatbed truck.

[0041] like Figure 2 and Figure 3As shown, a suspension shaft 13 for mounting the suspension body 11 is provided on the other end of the frame body 1 relative to the hook 2. Specifically, holes adapted to the suspension shaft 13 are respectively opened on the side surfaces of the two groups of longitudinal beams 102 at the edge of the frame body 1, and the suspension shaft 13 penetrates and is welded in the hole of the longitudinal beam 102, or the suspension shaft 13 is connected to the hole of the longitudinal beam 102 by interference connection. Among them, one end of the suspension shaft 13 located on the inner side surface of the longitudinal beam 102 is flush with the side wall of the longitudinal beam 102, and one end of the suspension shaft 13 located on the outer side surface of the longitudinal beam 102 extends out of the longitudinal beam 102 for mounting the suspension body 11. The design of the two groups of suspension shafts 13 being colinear and disconnected can reduce the length of the suspension shaft 13, reduce the material cost and forging cost of the suspension shaft 13, and enable the suspension shaft 13 to be manufactured without using large-scale forging equipment.

[0042] like Figures 1 to 3 As shown, the frame body 1 is also provided with lifting rings 10 for lifting the frame body 1. The lifting rings 10 are welded or connected to both sides of the front and rear ends of the frame body 1 by bolts. There are four sets in total, which is convenient for the turnover of the flatbed truck.

[0043] When transporting heavy equipment, the trailer hook is connected to the flatbed truck through the hook 2, and the other end of the flatbed truck is supported on the ground by a suspension. The frame body 1 as a whole is a simply supported structure. The gravity of the heavy equipment is borne by the longitudinal beam 102 and the cross beam 103, which reduces the local stress of the frame body 1 and greatly improves the carrying capacity of the flatbed truck. The flatbed truck can be made with a larger span and width to meet the carrying requirements of heavy equipment and avoid the problem of repeated installation and disassembly of heavy equipment.

[0044] like Figures 1 to 3 As shown, a support frame 5 is welded or bolted at both ends of the vertical plate 31 of the frame body 1, and a support column 6 that can slide with the support frame 5 is arranged inside the support frame 5. Among them, two holes of the same height are opened on the same side of the support frame 5, and two rows of holes of the same size and the same spacing are opened on the support column 6. A latch 8 is used to pass through the corresponding holes on the support frame 5 and the support column 6, so as to realize the function of lifting and lowering the support column 6. Optionally, the latch 8 is a T-shaped structure or a high-strength bolt.

[0045] A placement frame 7 is welded or bolted between the hook 2 and the support frame 5 on the vertical plate 31, and a hole for placing a latch 8 is provided on the placement frame 7. Extra latches 8 are plugged into the placement frame 7 to avoid the loss of the latches 8.

[0046] The support column 6 provides support for the frame body 1 when it is empty or fully loaded. Before carrying heavy equipment, the frame body 1 is placed in a horizontal position by adjusting the lifting height of the support column 6. After the heavy equipment is loaded, the trailer hook is connected to the hook 2 to carry the heavy equipment.

[0047] As another embodiment, the support column 6 can also be designed as a cylindrical structure with external threads, and the support frame 5 can be designed as a cylindrical structure with internal threads. The lifting function of the support column 6 is achieved through the threaded connection between the support column 6 and the support frame 5.

[0048] like Figures 4 to 6 As shown, the suspension body 11 includes a connecting beam and a wheel frame. The connecting beam is a closed box-shaped structure, and through suspension mounting holes are provided on the front and rear end surfaces of the connecting beam, which are used to connect with the suspension shaft 13 on the frame body 1, forming a suspension connecting portion 111 on the suspension body 11, and the suspension body 11 is connected to the side of the flatbed vehicle through the suspension connecting portion 111. Of course, the structure of the suspension connecting portion 111 can also be designed as: welding or bolting a keyway or coupling on the connecting beam, the suspension shaft 13 is designed as a cross-section that matches the keyway or coupling, and the keyway or coupling can also be used to achieve the connection between the suspension shaft 13 and the suspension body 11.

[0049] like Figures 4 to 6 As shown, there are two groups of wheel frames, and the wheel frames are symmetrically welded to the two ends of the connecting beam. According to the actual situation, the number of groups of wheel frames can also be selected to be more. The wheel frame is an open box-type structure with closed four sides and upper and lower openings. Through wheel mounting holes are opened on the front and rear end faces of the wheel frame for connecting with the wheel body to form a wheel mounting part 121 on the suspension body 11. Of course, the structure of the wheel mounting part 121 can also be designed as follows: welding or bolting a keyway or coupling on the wheel frame, the mandrel 21 on the wheel body is designed to have a cross-section that matches the keyway or coupling, and the connection between the mandrel 21 and the suspension body 11 can also be achieved through the keyway or coupling.

[0050] The suspension body 11 is welded from high-strength steel plates, wherein the number of wheel frames and wheel bodies is not limited to two groups. The heights of the wheel mounting holes on the wheel frames are the same and are higher than the heights of the suspension mounting holes on the connecting beam.

[0051] In the prior art, due to structural limitations, the wheels of flatbed trucks are usually installed at the bottom of the flatbed truck. The suspension body 11 of this embodiment is connected to the side of the flatbed truck through the suspension connecting part 111, and the suspension mounting hole is designed to be lower than the wheel mounting hole, which can make the installation height of the flatbed truck frame body 1 lower than the installation height of the wheel body, thereby reducing the overall height of the flatbed truck and effectively avoiding the risk of scraping the top when the flatbed truck carries heavy equipment. At the same time, the suspension body 11 of the present invention can be installed with two sets of wheel bodies, so that the two sets of wheel bodies can jointly bear the gravity of the heavy equipment, meeting the load-bearing requirements of the heavy equipment.

[0052] like Figure 5 As shown, the suspension shaft 13 on the frame body 1 is installed in the suspension mounting hole of the connecting beam, and a first bearing 14 is connected between the connecting beam on the suspension body 11 and the suspension shaft 13 on the frame body 1. The first bearing 14 adopts a tapered roller bearing. The tapered roller bearing has large axial and circumferential loads under low and high speed rotation conditions, and is easy to assemble and operate. The suspension shaft 13 is welded or interference-connected with the inner ring of the first bearing 14, and the connecting beam is welded or interference-connected with the outer ring of the first bearing 14, so that the connecting beam and the suspension shaft 13 can rotate freely. Among them, the first bearing 14 is divided into two groups, which are symmetrically arranged on both sides of the width direction of the connecting beam, so that the force on the suspension shaft 13 is uniform.

[0053] like Figure 5 As shown, a first bearing pad 22 for fixing the position of the first bearing 14 is provided on the suspension shaft 13, and a first shaft seal 15 for sealing lubricating oil is provided between the first bearing pad 22 and the connecting beam to ensure the lubrication effect of the first bearing 14, so that the first bearing 14 can be used for the full life. A first locking nut 16 for preventing the first bearing pad 22 from loosening is threadedly connected to the outer end of the suspension shaft 13, and the inner end of the suspension shaft 13 is set as a variable cross-section structure, so that the variable cross-section position clamps the first bearing pad 22 located on the inner side of the suspension shaft 13, thereby preventing it from loosening.

[0054] The suspension shaft 13 and the suspension body 11 of this embodiment can rotate relative to each other, so that the suspension body 11 can only bear the gravity of the heavy equipment and release the bending moment and torque generated by the fixed connection between the suspension shaft 13 and the suspension body 11, thereby improving the load-bearing capacity of the suspension body 11.

[0055] like Figure 6 As shown, the spindle 21 supporting the wheel body is installed in the wheel mounting hole of the wheel frame, and the wheel body includes a tire 12 and a wheel hub 20 detachably connected by bolts. Among them, the tire 12 is a solid rubber tire, which is used to buffer the vibration of the flatbed truck. Of course, the wheel body can also adopt a full steel roller or crawler structure according to actual needs.

[0056] like Figure 6 As shown, a second bearing 17 is connected between the wheel hub 20 and the mandrel 21, and the second bearing 17 also adopts a tapered roller bearing. The mandrel 21 is welded or interference-connected with the inner ring of the second bearing 17, and the wheel hub 20 is welded or interference-connected with the outer ring of the second bearing 17, so that the mandrel 21 and the wheel hub 20 can rotate freely. Among them, the second bearing 17 is divided into two groups, which are symmetrically arranged in the width direction of the wheel hub 20, so that the force on the mandrel 21 is uniform.

[0057] like Figure 6As shown, a second bearing pad 24 for fixing the second bearing 17 is arranged on the mandrel 21, and a second shaft seal 18 for sealing lubricating oil is arranged between the second bearing pad 24 and the wheel hub 20 to ensure the lubrication effect of the second bearing 17, so that the second bearing 17 can be used for the whole life. A second locking nut 19 for preventing the second bearing pad 24 from loosening is threadedly connected to the outer end of the mandrel 21, and a flange and a baffle are arranged at the inner end of the mandrel 21 to prevent the second bearing pad 24 from loosening on the inner side of the mandrel 21.

[0058] The connection structure of the wheel hub 20 and the core shaft 21 of this embodiment remains consistent with the connection structure of the suspension shaft 13 and the suspension body 11. On the one hand, it balances the force performance of the flatbed truck suspension, and on the other hand, it reduces the types of parts and components, which is beneficial to the assembly of parts and components.

[0059] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A flatbed trailer, characterized in that: It comprises a frame body (1), at least two sets of suspension bodies (11) and a plurality of wheel bodies, wherein: The frame body (1) comprises a plurality of longitudinal beams (102) and transverse beams (103) connected to each other, the beam height of the longitudinal beams (102) being not less than the beam height of the transverse beams (103), the upper surfaces of the longitudinal beams (102) and the transverse beams (103) being flush, and the upper surfaces of the longitudinal beams (102) and the transverse beams (103) being provided with frame plates (101); The frame body (1) is provided with a towing device, the towing device comprising a hook (2) with a bent hook direction facing the bottom of the frame body (1), the end of the frame body (1) is connected to a vertical plate (31) and a horizontal plate (32), the hook (2) is connected to the vertical plate (31), the horizontal plate (32) is detachably connected to a locking block (4) located below the hook (2) for preventing the hook from being unhooked, and the vertical plate (31) is provided with a guide port (9) for aligning with a guide column of a trailer; Each group of the suspension bodies (11) is provided with a suspension connection portion (111) and a plurality of wheel mounting portions (121); The suspension connecting parts (111) of at least two groups of the suspension bodies (11) are respectively connected to opposite side surfaces of the frame body (1); two groups of longitudinal beams (102) at the edge of the frame body (1) are respectively provided with colinear suspension mounting holes; the suspension body (11) is connected to the suspension mounting holes via the suspension connecting parts (111); a plurality of the wheel bodies are respectively mounted on a plurality of wheel mounting parts (121); the towing device is arranged at the front end of the frame body (1); and the suspension body (11) is arranged at the rear end of the frame body (1) opposite to the front end; Wherein, the connection position between the suspension connection part (111) and the frame body (1) is lower than the connection position between the wheel mounting part (121) and the wheel body.

2. The trailer flatbed according to claim 1, characterized in that: The vertical plate (31) is provided with a support frame (5) and a support column (6) slidably matched with the support frame (5); the support frame (5) and the support column (6) are respectively provided with a plurality of corresponding connection holes, so that the support frame (5) is detachably connected to the support column (6) via a latch (8) to drive the lifting and lowering of the frame body (1); and the vertical plate (31) is also provided with a placement frame (7) for storing the latch (8).

3. The trailer flatbed according to claim 1, characterized in that: The suspension body (11) comprises a connecting beam of a box-shaped structure and wheel frames symmetrically arranged at both ends of the connecting beam, the suspension connecting portion (111) is arranged on the connecting beam, the wheel mounting portion (121) is arranged on the wheel frame, and the wheel body comprises a detachably connected tire (12) and a wheel hub (20).

4. The trailer flatbed according to claim 3, characterized in that: The suspension connection portion (111) comprises a suspension shaft (13) and a first bearing (14) for connecting the frame body (1) and the suspension body (11); the suspension shaft (13) is connected to the inner ring of the first bearing (14); the connection beam on the suspension body (11) is connected to the outer ring of the first bearing (14); and the suspension shaft (13) is connected to a suspension mounting hole.

5. The trailer flatbed according to claim 4, characterized in that: The suspension shaft (13) is provided with a first bearing pad (22) for fixing the first bearing (14); a first shaft seal (15) for sealing lubricating oil is provided between the first bearing pad (22) and the connecting beam; and the suspension shaft (13) is also provided with a first locking nut (16) for preventing the first bearing pad (22) from loosening.

6. The trailer flatbed according to claim 3, characterized in that: The wheel mounting portion (121) comprises a spindle (21) and a second bearing (17) for connecting the wheel body and the suspension body (11); the spindle (21) is connected to the inner ring of the second bearing (17); the wheel body is connected to the outer ring of the second bearing (17); and the spindle (21) is connected to the wheel frame of the suspension body (11).

7. The trailer flatbed according to claim 6, characterized in that: The spindle (21) is provided with a second bearing pad (24) for fixing the second bearing (17); a second shaft seal (18) for sealing lubricating oil is provided between the second bearing pad (24) and the wheel body; and the spindle (21) is also provided with a second locking nut (19), a flange and a baffle for preventing the second bearing pad (24) from loosening.

8. The trailer flatbed according to any one of claims 1 to 7, characterized in that: The frame body (1) is also provided with a limit block (23) for positioning the bearing device and a lifting ring (10) for lifting the frame body (1).

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