Gravel backfilling, paving and tamping integrated device

Abstract

The utility model provides a broken stone backfilling, paving and tamping integrated device which comprises a dumper, a self-discharging assembly, a blanking control assembly and a compacting assembly, the dumper comprises a dumper body and a charging hopper, broken stone materials are stored in the charging hopper, the charging hopper can be inclined through the self-discharging assembly to be in a discharging posture, and therefore broken stones are paved on a backfilling site. And a discharging gap for discharging the broken stones is formed between the discharging plate and the charging hopper, so that the broken stone materials can be uniformly spread conveniently. And the paved and scattered gravel materials are compacted through the compacting assembly, so that backfilling is tighter, and meanwhile the surface is smoother. The dumper, the self-unloading assembly, the blanking control assembly and the compaction assembly act together, so that integrated operation of discharging, spreading and tamping of gravel materials can be achieved, and the problems that in the prior art, gravel conveying, spreading and tamping are carried out step by step, efficiency is low, and manpower is consumed in the gravel spreading period are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of crushed stone backfill construction, and in particular relates to a crushed stone backfill paving integrated device. Background Art

[0002] In the process of urban reconstruction and expansion, it involves the demolition of existing buildings and masonry structures, milling and excavation of asphalt concrete pavement, and demolition of bridge and culvert concrete. The above construction links will generate a large amount of solid waste. Direct stacking and treatment of solid waste will increase the cost of transportation and occupy land. Improper treatment will also pollute the environment and create safety hazards. Therefore, in the process of urban construction, how to realize the recycling of the above solid waste resources to achieve the purpose of cost reduction, efficiency improvement, energy conservation and emission reduction is an important topic being studied in the industry.

[0003] In order to realize the recycling of solid waste resources, there is a technology in the prior art that solid waste such as abandoned earth and stone, concrete, etc. is processed into crushed stone by a crusher for road paving, roadbed filling, foundation pit backfilling, etc. On the one hand, this construction technology solves the problems of the difficulty in handling a large amount of solid waste and the deteriorating ecological environment caused by it. On the other hand, by treating solid waste through certain means and using it to replace natural aggregates, it can reduce the mining of natural sand and gravel for construction and transportation projects, and to a large extent solves the increasing shortage of natural aggregates and the damage to the ecological environment caused by the mining of a large amount of sand and gravel, saving resources, protecting the environment, and having good social and economic benefits.

[0004] In the construction of gravel backfill, the operation method of the prior art is to use transport machinery such as forklifts, dump trucks, bulldozers, scrapers, dump trucks, etc. to pile up the gravel materials on the backfill site, then spread the gravel materials by wheelbarrows and shovels, and finally compact the gravel layer by flat rollers, vibrating rollers, tamping machines, etc. to achieve the backfill construction of the gravel materials. The disadvantages of this method are that the gravel transportation, spreading and compaction are carried out in steps, the efficiency is low, and the gravel spreading period is relatively labor-intensive. Utility Model Content

[0005] The utility model provides a crushed stone backfilling, paving and compacting integrated device, aiming to solve the problems in the prior art that crushed stone conveying, paving and compacting are carried out in separate steps, resulting in low efficiency and more labor consumption during crushed stone paving.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a crushed stone backfilling, paving and compacting integrated device, comprising:

[0007] A dump truck, comprising a vehicle body and a loading hopper, wherein the loading hopper is hinged to the vehicle body, a discharge port is provided at the rear of the loading hopper, and the loading hopper has a loading posture and a discharging posture. When in the loading posture, the loading hopper is horizontal, and when in the discharging posture, the discharge port is located at the lowermost end of the loading hopper;

[0008] A self-unloading assembly, provided on the vehicle body and connected to the loading hopper, for driving the loading hopper to switch between the loading posture and the unloading posture;

[0009] A material drop control assembly, comprising a discharge plate and a first driving mechanism, wherein the discharge plate is slidably matched with the discharge port, a discharge gap is formed between the bottom of the discharge plate and the bottom of the charging hopper, and the first driving mechanism is provided at the charging hopper and is used to drive the discharge plate to move in the up-down direction so as to adjust the size of the discharge gap in the height direction; and

[0010] The compacting assembly is arranged at the rear of the vehicle body and is used for compacting the ground.

[0011] In a possible implementation, the charging hopper includes:

[0012] A bottom plate is hinged to the vehicle body, and the dump assembly is connected to the bottom plate;

[0013] Two first side plates are arranged opposite to each other at two sides of the bottom plate, the discharge plate is slidably matched with the first side plates, and the discharge gap is formed between the discharge plate and the bottom plate; and

[0014] The second side plate is arranged on one side of the bottom plate adjacent to the head of the vehicle body.

[0015] In a possible implementation, the first driving mechanism includes two lifting driving members, a mounting block is provided on one side of the first side plate adjacent to the rear of the vehicle body, the lifting driving members correspond to the first side plates one by one, and the lifting driving members are respectively arranged on the corresponding mounting blocks.

[0016] In a possible implementation, the vehicle body is a tracked transport vehicle.

[0017] In a possible implementation, the dump assembly is a hydraulic cylinder, one end of the hydraulic cylinder is hinged to the vehicle body, the other end of the hydraulic cylinder is hinged to the loading hopper, and the vehicle body has an accommodating space for accommodating the hydraulic cylinder.

[0018] In a possible implementation, the compacting component includes:

[0019] A first connecting frame connected to the rear of the vehicle body; and

[0020] The rolling wheel is rotatably arranged on the first connecting frame around a horizontal axis parallel to the width direction of the vehicle body.

[0021] In a possible implementation, a plurality of the rolling wheels are provided, and the plurality of the rolling wheels are spaced apart along the length direction of the vehicle body.

[0022] In a possible implementation, the compacting component includes:

[0023] A second connecting frame connected to the rear of the vehicle body;

[0024] a compacting member, comprising a horizontal pressing plate and a vertical sliding rod, wherein the pressing plate is connected to the bottom of the sliding rod, and the sliding rod is slidably matched with the second connecting frame along the vertical direction; and

[0025] The lifting mechanism is arranged on the second connecting frame and is used for driving the sliding rod to move up and down.

[0026] In one possible implementation, the side wall of the sliding rod has a support portion extending in the horizontal direction, and the lifting mechanism includes a cam and a drive motor. The cam is rotatably engaged with the second connecting frame and is located below the support portion. The lower surface of the support portion abuts against the outer periphery of the cam. The drive motor is provided on the second connecting frame for driving the cam to rotate around a horizontal axis.

[0027] In a possible implementation, a plurality of the sliding bars are provided, the plurality of the sliding bars are spaced apart along the width direction of the vehicle body, and a plurality of the lifting mechanisms are provided corresponding to the sliding bars.

[0028] Compared with the prior art, the beneficial effects of the integrated device for backfilling, paving and compacting gravel provided by the utility model are:

[0029] The utility model provides a crushed stone backfill paving and compacting integrated device, which includes a dump truck, a dump assembly, a material drop control assembly and a compacting assembly. The dump truck includes a vehicle body and a loading hopper. The loading hopper can store crushed stone materials. After the dump truck moves to a designated location where the crushed stone is to be laid, the loading hopper can be tilted by the dump assembly to be in a discharging posture, and the crushed stone materials can fall from the discharge port. While the crushed stone materials are discharged, the dump truck moves forward at a uniform speed, so that the crushed stone is spread on the backfill site. Since the discharge port is arranged at the tail of the loading hopper, the width of the crushed stone laying is consistent with the width of the loading hopper, and a discharge gap for the discharge of the crushed stone is formed between the discharge plate and the loading hopper, which facilitates the even distribution of the crushed stone materials. By controlling the size of the discharge gap by the material drop control assembly, the discharge speed of the crushed stone materials can be controlled, which is convenient for controlling the laying thickness and backfilling amount of the crushed stone materials. The spread crushed stone materials are compacted by the compacting assembly, so that the backfill is tighter and the surface is smoother. The dump truck, dump assembly, material drop control assembly and compaction assembly in the utility model work together to realize automatic discharging, spreading and compacting of crushed stone materials, thus solving the problem that the crushed stone conveying, spreading and compacting are carried out in separate steps in the prior art, resulting in low efficiency and high manpower consumption during the crushed stone spreading process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of a crushed stone backfill, paving and compacting integrated device provided in one embodiment of the utility model;

[0031] Figure 2 A partial cross-sectional view of a dump truck in one embodiment of the utility model;

[0032] Figure 3 A schematic diagram of the structure of a crushed stone backfilling, paving and compacting integrated device provided in another embodiment of the utility model;

[0033] Figure 4 It is a structural schematic diagram of a compacting assembly in another embodiment of the utility model;

[0034] Figure 5 It is an internal cross-sectional view of a compacting assembly in another embodiment of the present invention.

[0035] Description of reference numerals:

[0036] 1. Gravel backfill, paving and compacting integrated device; 10. Dump truck; 11. Vehicle body; 12. Loading hopper; 121. Bottom plate; 122. First side plate; 123. Second side plate; 20. Dump assembly; 30. Dropping control assembly; 31. Discharging plate; 32. First driving mechanism; 40. Compacting assembly; 41. First connecting frame; 42. Rolling wheel; 43. Second connecting frame; 44. Compacting member; 441. Pressing plate; 442. Sliding rod; 443. Supporting part; 45. Lifting mechanism; 451. Cam; 452. Driving motor. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] It should be noted that when an element is referred to as being "fixed to", "fixed" or "fixedly disposed" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" or "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. When an element is referred to as being "set to" or "disposed on" another element, it may be directly on the other element or there may be a central element. "Multiple" refers to two or more quantities. "At least one" refers to one or more quantities. "Several" refers to one or more quantities.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0040] Please also read Figures 1 to 5 The following is a description of the integrated gravel backfilling, paving and compacting device 1 provided in an embodiment of the utility model.

[0041] See also Figure 1 , Figure 2 and Figure 3The embodiment of the utility model provides a crushed stone backfilling, paving and compacting integrated device 1, including a dump truck 10, a dump assembly 20, a material falling control assembly 30 and a compacting assembly 40. The dump truck 10 includes a vehicle body 11 and a loading hopper 12, the loading hopper 12 is hinged to the vehicle body 11, a discharge port is provided at the rear of the loading hopper 12, the loading hopper 12 has a loading posture and a unloading posture, when in the loading posture, the loading hopper 12 is horizontal, and when in the unloading posture, the discharge port is located at the lowermost end of the loading hopper 12; the dump truck 10 includes a vehicle body 11 and connected to the loading hopper 12, and is used to drive the loading hopper 12 to switch between the loading posture and the unloading posture; the material dropping control component 30 includes a discharge plate 31 and a first driving mechanism 32, the discharge plate 31 is slidably matched with the discharge port, a discharge gap is formed between the bottom of the discharge plate 31 and the bottom of the charging hopper 12, the first driving mechanism 32 is provided at the charging hopper 12, and is used to drive the discharge plate 31 to move in the up and down direction to adjust the size of the discharge gap in the height direction; the compaction component 40 is provided at the rear of the vehicle body 11, and is used to compact the ground.

[0042] Compared with the prior art, the beneficial effects of the crushed stone backfilling, paving and compacting integrated device 1 provided in the embodiment of the utility model are:

[0043] The crushed stone backfilling paving and compacting integrated device 1 provided by the embodiment of the utility model comprises a dump truck 10, a dump assembly 20, a material dropping control assembly 30 and a compacting assembly 40. The dump truck 10 comprises a vehicle body 11 and a loading hopper 12. The loading hopper 12 can store crushed stone materials. After the dump truck 10 moves to the designated location where the crushed stone is to be laid, the loading hopper 12 can be tilted by the dump assembly 20 to be in a discharging posture, and the crushed stone materials can fall from the discharge port. While the crushed stone materials are discharged, the dump truck 10 moves forward at a uniform speed, so that the crushed stone is spread on the backfill site. Since the discharge port is arranged at the tail of the loading hopper 12, the crushed stone laying width is consistent with the width of the loading hopper 12, and a discharge gap for the discharge of the crushed stone is formed between the discharge plate 31 and the loading hopper 12, so as to facilitate the even distribution of the crushed stone materials. By controlling the size of the discharge gap by the material dropping control assembly 30, the discharge speed of the crushed stone materials can be controlled, which is convenient for controlling the laying thickness and backfilling amount of the crushed stone materials. The spread crushed stone material is compacted by the compacting assembly 40 to make the backfill more compact and the surface smoother.

[0044] In the embodiment of the utility model, the dump truck 10, the dump assembly 20, the material dropping control assembly 30 and the compaction assembly 40 work together to realize the automatic discharging, spreading and compacting of the crushed stone material, which solves the problem that the crushed stone conveying, spreading and compacting are carried out in steps in the prior art, the efficiency is low, and the manpower is relatively consumed during the crushed stone spreading.

[0045] In the embodiment of the utility model, the dump truck 10 can directly select existing transport vehicles on the market, specifically, it can be a wheeled or tracked vehicle. The dump truck 10 includes a vehicle body 11 and a loading hopper 12, and can be moved by a fuel engine or a battery as a power source. A cab is provided on the vehicle body 11, and the driver controls the dump truck 10 to move in the backfilling site in the cab, and controls the operation of the dump assembly 20 and the material drop control assembly 30 to realize the discharge and paving of crushed stone materials.

[0046] The loading hopper 12 is used to store crushed stone materials. The loading hopper 12 is usually an open bucket, and the crushed stone materials can be filled into the loading hopper 12 by an excavator or a forklift. The crushed stone materials can be natural crushed stone, or crushed stone obtained by crushing stone or construction solid waste by a crusher.

[0047] The self-unloading assembly 20 is used to adjust the posture of the loading hopper 12. The self-unloading assembly 20 is usually a hydraulic cylinder, but it can also be a power device such as a hydraulic rotary motor that can drive the loading hopper 12 to rotate and tilt.

[0048] The material drop control assembly 30 includes a discharge plate 31 and a first drive mechanism 32. The discharge plate 31 is disposed at the rear of the charging hopper 12 and is used to enclose together with the charging hopper 12 to form a storage space for crushed stone materials. The discharge plate 31 can be made of steel plate.

[0049] The first driving mechanism 32 can drive the discharge plate 31 to move up and down, so as to adjust the size of the discharge gap. When the charging hopper 12 is in the loading posture, the discharge gap is zero, and when the charging hopper 12 is in the unloading posture, the discharge gap is used to allow the crushed stones to fall out. The first driving mechanism 32 can be a hydraulic cylinder, an electric lifting rod, or a rack structure driven by a motor, etc., which can drive the discharge plate 31 to move linearly.

[0050] By changing the inclination angle of the charging hopper 12 and the height of the discharging gap, the discharging speed of the crushed stone material can be adjusted. In combination with the moving speed of the dump truck 10, the paving thickness of the crushed stone can be adjusted.

[0051] See also Figure 1 , Figure 2 and Figure 3In some possible embodiments, the loading hopper 12 includes a bottom plate 121, two first side plates 122 and a second side plate 123. The bottom plate 121 is hinged to the vehicle body 11, and the dump assembly 20 is connected to the bottom plate 121; the two first side plates 122 are arranged on both sides of the bottom plate 121, and the discharge plate 31 is slidably matched with the first side plates 122, and a discharge gap is formed between the discharge plate 31 and the bottom plate 121; the second side plate 123 is arranged on the side of the bottom plate 121 adjacent to the head of the vehicle body 11. The bottom plate 121, the two first side plates 122 and the second side plate 123 can be made of wear-resistant steel plates and connected as a whole by welding. The discharge plate 31 is slidably matched with the end faces of the two first side plates 122.

[0052] In one possible implementation, the first driving mechanism 32 includes two lifting driving members, and a mounting block is provided on one side of the first side plate 122 adjacent to the rear of the vehicle body 11. The lifting driving members correspond one-to-one to the first side plate 122, and the lifting driving members are respectively arranged on the corresponding mounting blocks. The lifting driving members are used to drive the discharge plate 31 to move up and down. The provision of two lifting driving members helps to balance the force on the discharge plate 31, and will not deform after long-term use.

[0053] See also Figure 1 and Figure 3 In some possible embodiments, the vehicle body 11 is a tracked transport vehicle, and of course it can also be a rubber-wheeled vehicle.

[0054] See also Figure 2 In some possible embodiments, the dump assembly 20 is a hydraulic cylinder, one end of which is hinged to the vehicle body 11, and the other end of which is hinged to the loading hopper 12. The vehicle body 11 has an accommodation space for accommodating the hydraulic cylinder. The hydraulic cylinder uses hydraulic oil and a hydraulic pump as power energy, and has stable operation, strong load-bearing capacity, and good durability.

[0055] See also Figure 1 In some possible embodiments, the compaction assembly 40 is a wheeled compaction structure, and the compaction assembly 40 includes a first connecting frame 41 and a rolling wheel 42. The first connecting frame 41 is connected to the rear of the vehicle body 11, and can drive the rolling wheel 42 to roll forward when the dump truck 10 moves forward; the rolling wheel 42 is rotatably arranged on the first connecting frame 41 around a horizontal axis parallel to the width direction of the vehicle body 11. When the gravel is spread on the ground, the rolling wheel 42 can roll the gravel layer to make the gravel more compact, and also help to make the surface of the gravel layer smoother.

[0056] See also Figure 1 In some possible embodiments, a plurality of rolling wheels 42 are provided, and the plurality of rolling wheels 42 are spaced apart along the length direction of the vehicle body 11 , which helps to improve the compaction effect.

[0057] See also Figure 3 , Figure 4 and Figure 5 In some possible embodiments, the compacting assembly 40 includes a second connecting frame 43, a compacting member 44, and a lifting mechanism 45. The second connecting frame 43 is connected to the rear of the vehicle body 11; the compacting member 44 has a horizontal pressing plate 441 and a vertical sliding rod 442, the pressing plate 441 is connected to the bottom of the sliding rod 442, and the sliding rod 442 slides along the vertical direction to fit the second connecting frame 43; the lifting mechanism 45 is provided on the second connecting frame 43, and is used to drive the sliding rod 442 to move up and down. The lifting mechanism 45 can be a vertically arranged electric lift, a hydraulic lift rod, etc.

[0058] In this embodiment, the compaction assembly 40 is a plate-type compaction mechanism, and the compaction member 44 has a compaction plate, the bottom surface of the compaction plate is a plane, and the compaction member 44 is driven to move up and down by the lifting mechanism 45, and the pressing plate 441 can compact the gravel below.

[0059] The wheel compaction mechanism is suitable for construction scenarios with a thin gravel layer, while the plate compaction mechanism is suitable for construction scenarios with a thick gravel layer. Users can choose according to their own situation. In order to facilitate the replacement of the two compaction components 40, the first connecting frame 41 and the second connecting frame 43 can be detachably connected to the vehicle body 11 by bolts.

[0060] See also Figure 5 In some possible embodiments, the side wall of the sliding rod 442 has a support portion 443 extending in the horizontal direction, and the lifting mechanism 45 includes a cam 451 and a drive motor 452. The cam 451 is rotatably engaged with the second connecting frame 43 and is located below the support portion 443. The lower surface of the support portion 443 abuts against the outer periphery of the cam 451. The drive motor 452 is provided on the second connecting frame 43 for driving the cam 451 to rotate around the horizontal axis.

[0061] When the lifting mechanism 45 is working, the driving motor 452 drives the cam 451 to rotate. Since the outer peripheral surface of the cam 451 abuts against the support part 443, the cam 451 can drive the compacting member 44 to move up and down, so that the pressing plate 441 can compact the gravel layer below. The driving motor 452 can be a reduction motor, which uses a speed reducer to reduce speed and increase torque to drive the cam 451 to rotate.

[0062] See also Figure 4 and Figure 5 In some possible embodiments, a plurality of slide bars 442 are provided, and the plurality of slide bars 442 are spaced apart along the width direction of the vehicle body 11 , and a plurality of lifting mechanisms 45 are provided corresponding to the slide bars 442 , which helps to make the force more stable.

[0063] It can be understood that the various parts in the above-mentioned embodiments can be freely combined or deleted to form different combination embodiments. The specific contents of each combination embodiment will not be repeated here. After this description, it can be considered that the utility model specification has recorded various combination embodiments and can support different combination embodiments.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A crushed stone backfilling, paving and compacting integrated device, characterized in that: include: A dump truck, comprising a vehicle body and a loading hopper, wherein the loading hopper is hinged to the vehicle body, a discharge port is provided at the rear of the loading hopper, and the loading hopper has a loading posture and a discharging posture. When in the loading posture, the loading hopper is horizontal, and when in the discharging posture, the discharge port is located at the lowermost end of the loading hopper; A self-unloading assembly, provided on the vehicle body and connected to the loading hopper, for driving the loading hopper to switch between the loading posture and the unloading posture; A material drop control assembly, comprising a discharge plate and a first driving mechanism, wherein the discharge plate is slidably matched with the discharge port, a discharge gap is formed between the bottom of the discharge plate and the bottom of the charging hopper, and the first driving mechanism is provided at the charging hopper and is used to drive the discharge plate to move in the up-down direction so as to adjust the size of the discharge gap in the height direction; and The compacting assembly is arranged at the rear of the vehicle body and is used for compacting the ground.

2. The integrated device for backfilling, paving and compacting gravel according to claim 1, characterized in that: The charging hopper comprises: A bottom plate is hinged to the vehicle body, and the dump assembly is connected to the bottom plate; Two first side plates are arranged opposite to each other at two sides of the bottom plate, the discharge plate is slidably matched with the first side plates, and the discharge gap is formed between the discharge plate and the bottom plate; and The second side plate is arranged on one side of the bottom plate adjacent to the head of the vehicle body.

3. The integrated device for backfilling, paving and compacting gravel according to claim 2, characterized in that: The first driving mechanism includes two lifting driving members, a mounting block is provided on one side of the first side plate adjacent to the rear of the vehicle body, the lifting driving members correspond to the first side plates one by one, and the lifting driving members are respectively arranged on the corresponding mounting blocks.

4. The integrated device for backfilling, paving and compacting gravel according to claim 1, characterized in that: The vehicle body is a crawler transport vehicle.

5. The integrated device for backfilling, paving and compacting gravel according to claim 1, characterized in that: The dump assembly is a hydraulic cylinder, one end of which is hinged to the vehicle body, the other end of which is hinged to the loading hopper, and the vehicle body has an accommodating space for accommodating the hydraulic cylinder.

6. The integrated device for backfilling, paving and compacting gravel according to claim 1, characterized in that: The compacting assembly comprises: A first connecting frame connected to the rear of the vehicle body; and The rolling wheel is rotatably arranged on the first connecting frame around a horizontal axis parallel to the width direction of the vehicle body.

7. The integrated device for backfilling, paving and compacting gravel according to claim 6, characterized in that: There are multiple rolling wheels, and the multiple rolling wheels are arranged at intervals along the length direction of the vehicle body.

8. The integrated device for backfilling, paving and compacting gravel according to claim 1, characterized in that: The compacting assembly comprises: A second connecting frame connected to the rear of the vehicle body; a compacting member, comprising a horizontal pressing plate and a vertical sliding rod, wherein the pressing plate is connected to the bottom of the sliding rod, and the sliding rod is slidably matched with the second connecting frame along the vertical direction; and The lifting mechanism is arranged on the second connecting frame and is used for driving the sliding rod to move up and down.

9. The integrated device for backfilling, paving and compacting gravel according to claim 8, characterized in that: The side wall of the sliding rod is provided with a support portion extending in the horizontal direction. The lifting mechanism includes a cam and a drive motor. The cam is rotatably engaged with the second connecting frame and is located below the support portion. The lower surface of the support portion abuts against the outer periphery of the cam. The drive motor is arranged on the second connecting frame for driving the cam to rotate around a horizontal axis.

10. The integrated crushed stone backfilling, paving and compacting device according to claim 8 or 9, characterized in that: There are a plurality of slide bars, which are spaced apart along the width direction of the vehicle body, and there are a plurality of lifting mechanisms corresponding to the slide bars.

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