A four-box modular logistics transport vehicle

Abstract

This application discloses a four-box combined logistics transport vehicle, including a vehicle body. Two base plates are fixedly or rotatably connected to the vehicle body. Two boxes are placed side-by-side on each of the base plates. A crane arm for lifting / installing the boxes on the base plates is fixedly installed on the vehicle body between the two base plates. The crane arm includes a lifting head for connecting the boxes, and each box has a lifting cover that is detachably engaged with the lifting head. At least two guide rails are arranged parallel to the width of the vehicle body on the base plates, and each guide rail has a retractable engaging mechanism that extends to the side walls of the guide rails. This invention employs a four-box structure design, which can address the problem of not needing to open the boxes or minimizing the time and increased risk of damage during loading and unloading of goods of different types and destinations during logistics transit.

Description

Technical Field

[0001] This invention relates to the field of logistics transportation technology, and more particularly to the field of logistics transportation equipment, devices, and facilities, specifically to a four-box combined logistics transportation vehicle. Background Technology

[0002] Logistics permeates every aspect of people's lives, from small parcel deliveries to large-scale relocation and equipment transportation. Current logistics, especially short- and medium-distance transport, typically relies on vehicles, particularly at the logistics terminal. Therefore, logistics vehicles, as an indispensable part of the logistics supply chain, become a crucial factor influencing the efficiency of logistics.

[0003] Aside from exceptionally large equipment, most logistics vehicles use cargo boxes to store and load transported goods. To facilitate cargo transfer, the cargo boxes and vehicles are designed as detachable, separate units. However, each cargo box is individual, and items can only be loaded inside. The most common form of express delivery is also part of logistics, but it involves a wider variety of goods and more complex destinations compared to conventional large-item logistics. Even in large-item logistics, the types of goods and destinations are not limited to a single point, and the issues of transfer and multi-destination delivery still exist. Using existing box-type or flat-panel container logistics vehicles, when transporting various types of goods to multiple destinations, inevitably leads to mixed loading and unloading at transit stations. This process consumes a significant amount of time for loading and unloading, and is prone to damage during this process. Furthermore, unloading can cause obstructions at the front, preventing the individual unloading of items at the back, thus increasing the unloading volume and the damage rate.

[0004] To reduce cargo damage rates, the applicant obtained prior art through the search formula ((classification) AND (damage) OR (cargo damage)) AND ti:((logistics vehicle)): Patent document CN218702937U discloses a categorizable logistics vehicle, including a cargo compartment, a chute, and a water tank. The cargo compartment has a sliding rod inside, and a slider is provided on the surface of the sliding rod. The side of the slider away from the sliding rod is connected to a classification plate. This categorizable logistics vehicle, by rotating a first locking wheel, separates the first locking wheel from a first locking hole, allowing the classification plate to open. Simultaneously, by pulling the classification plate, it can move on the surface of the sliding rod. Simultaneously, by rotating a second locking wheel, it connects with a second locking hole, allowing the classification plate to engage. Furthermore, by pulling a handle inside the classification plate, it can move a telescopic placement plate, which engages with a slot on one side of the classification plate. This solves the problem of damage caused by piling up packages during use.

[0005] The aforementioned existing technologies also employ a single-container structure. Although additional structures are incorporated within the container to prevent damage during transport, they fail to address the significant time commitment and unloading / loading issues associated with transshipment. Therefore, this application aims to address the problem of separately packing different types of goods or goods destined for different destinations, allowing for direct hoisting of containers during transshipment, eliminating the time-consuming process of opening containers, and preventing damage during loading and unloading. Summary of the Invention

[0006] To address the problems of time-consuming unpacking and sorting, difficulty in stacking different types of goods, and increased risk of damage associated with existing enclosed vans used for transporting multiple categories of goods, this application provides a four-box combined logistics transport vehicle. This differs from the existing single-box model and includes built-in lifting equipment, enabling direct lifting and transfer of goods of different types and destinations without the need for unpacking and sorting, significantly improving transfer efficiency. Simultaneously, items of the same type can be neatly stacked, greatly enhancing the utilization of the internal space of the container. This application serves as a replacement for existing enclosed van logistics vehicles or flatbed container logistics vehicles.

[0007] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0008] A four-box combined logistics transport vehicle includes a vehicle body with two base plates fixedly or rotatably connected to it. Two boxes are placed side by side on each base plate. A crane arm for lifting / installing the boxes on the base plates is fixedly installed on the vehicle body between the two base plates. The crane arm includes a lifting head for connecting the boxes. The boxes have lifting covers that can be detachably engaged with the lifting head. At least two guide rails are arranged parallel to the width of the vehicle body on the base plates. The guide rails are equipped with locking mechanisms that can extend to the outside of the side walls of the guide rails. The bottom of the boxes has multiple grooves corresponding to the guide rails. The side walls of the grooves are provided with arc-shaped grooves that engage with the locking mechanisms.

[0009] Preferably, the boom includes a base fixedly connected to the vehicle body, a retractable longitudinal arm rotatably mounted on the base, a retractable transverse arm hinged perpendicularly to the longitudinal arm, a lifting head fixedly connected to the retractable free end of the transverse arm, and the transverse arm and the longitudinal arm are hinged to each other near the lifting head by a hydraulic cylinder, and the transverse arm is deflected in the vertical plane by the extension and retraction of the hydraulic cylinder.

[0010] Preferably, the lifting head includes a bracket fixedly installed at a 90° angle to the telescopic free end of the cross arm. A first mounting plate is fixedly installed on the lower surface of the bracket, and a second mounting plate is also provided below the first mounting plate. The first mounting plate and the second mounting plate are connected by two second telescopic mechanisms and a universal mechanism. A rotating mechanism is installed in the middle of the second mounting plate, and the output shaft of the rotating mechanism passes through the second mounting plate and is connected to a lifting plate for engaging with the lifting cover.

[0011] Preferably, the second telescopic mechanism includes a hydraulic rod that is hydraulically telescopic, the lower end of which is connected to the second mounting plate via a ball joint; the universal joint mechanism is a universal joint or a ball joint structure.

[0012] Preferably, a protruding limiting plate is fixedly provided on the upper surface of the lifting plate near both ends, and a protruding limit switch is installed on the limiting plate. An arc-shaped cavity for accommodating the lifting plate is provided on the lower surface of the lifting cover. A clearance groove for accommodating the limiting plate is provided at the top of the arc-shaped cavity. A blind hole for avoiding the limit switch is also provided at the top of the clearance groove. The limit switch is connected in series with an indicator light installed in the driver's cab and the car battery.

[0013] Preferably, the locking mechanism includes a first telescopic mechanism disposed at the bottom of the base plate. The first telescopic mechanism is connected to a pressure plate disposed at the middle position of the guide rail along the length direction of the guide rail. The upper surface of the pressure plate is fixed and spaced apart with a plurality of locking pins penetrating the guide rail. The upper end of each locking pin is tapered or wedge-shaped. A horizontally disposed channel is connected through the middle position of any vertical through hole accommodating the locking pin. The diameter of the hole where the channel intersects with the two side walls of the guide rail is smaller than the diameter of the hole inside the guide rail. A plurality of steel balls abutting each other are disposed in the channel. The first telescopic mechanism drives any one of the locking pins to move vertically within the guide rail through the pressure plate, causing the steel balls to protrude to the outside of the two side walls of the guide rail and engage with the arc-shaped groove or retract into the channel to loosen the housing from the guide rail. Beneficial effects

[0014] 1. This invention adopts a four-box structure design, which can reduce the time and risk of damage caused by unpacking and unloading different types of goods and goods to different destinations during logistics transit without opening the boxes. At the same time, placing two boxes side by side avoids the problems of box jamming and collision that would occur when placing them front and back, which would make hoisting difficult.

[0015] 2. The present invention has a crane arm between the boxes, which can lift and transfer the boxes by extension and retraction, eliminating the cumbersome process of parking the logistics vehicle in the working range of the gantry crane and manually loosening and confirming before lifting, which is required in the prior art, thus making the transfer efficiency higher.

[0016] 3. The steel ball type snap-fit ​​structure used between the box and the vehicle body of this invention can control the snap-fit ​​and loosening state between the steel ball and the box through the telescopic mechanism, so that a single driver can carry out the lifting operation of the box without the need for a third person to assist and inspect.

[0017] 4. The present invention is equipped with a limit switch on the lifting head, which is matched with the structure of the lifting cover. The operator can intuitively know whether the fit between the lifting head and the lifting cover meets the lifting standard, so as to ensure the safety of the lifting. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is the structural isometric drawing of this application.

[0020] Figure 2 yes Figure 1 Another visual axonometric drawing.

[0021] Figure 3 yes Figure 1 The main view.

[0022] Figure 4 yes Figure 3 A sectional view with the section symbol AA along the center line.

[0023] Figure 5 yes Figure 4 Enlarged view of the structure in area B.

[0024] Figure 6 yes Figure 3 Top view.

[0025] Figure 7 yes Figure 6 A sectional view with the section symbol CC.

[0026] Figure 8 yes Figure 7 Enlarged view of the structure in the middle D region.

[0027] Figure 9 yes Figure 8 Enlarged view of the structure in region E.

[0028] Figure 10 This is a schematic diagram of the container in a lifting state.

[0029] Figure 11 yes Figure 10 Enlarged view of the structure in the middle F region.

[0030] Figure 12 It is an isometric drawing of the hoisting cover structure.

[0031] Figure 13 yes Figure 12 A cross-sectional view with the section symbol GG.

[0032] In the diagram: 1-Car body; 2-Base plate; 21-Guide rail; 22-Channel; 23-Steel ball; 3-Box; 31-Arc groove; 4-Lifting cover; 41-Arc cavity; 42-Allowing groove; 5-Locking device; 6-Hanging arm; 61-Base; 62-Longitudinal arm; 63-Hydraulic cylinder; 64-Horizontal arm; 7-Lifting head; 71-Bracket; 72-First mounting plate; 73-Second mounting plate; 74-Second telescopic mechanism; 75-Universal mechanism; 76-Rotating mechanism; 77-Spherical knot; 78-Lifting plate; 781-Limit plate; 782-Limit switch; 8-First telescopic mechanism; 9-Pressure plate; 10-Clamping pin. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this application, it should be noted that the use of terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the use of terms such as "first" and "second" in the description of this application is only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this application does not imply that the component is required to be absolutely horizontal or suspended, but rather that it may be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0038] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Example

[0039] See Figures 1-2 The illustrated four-box modular logistics transport vehicle includes a vehicle body 1, on which two base plates 2 are fixedly or rotatably connected. Two boxes 3 are placed side-by-side on each of the base plates 2. (Refer to the attached instruction manual.) Figure 1 and Figure 2As shown, the container 3 is placed side-by-side with reference to the vehicle body 1. A crane arm 6 for lifting / installing the container 3 on the base plates 2 is fixedly installed on the vehicle body 1 between the two base plates 2. The advantages of placing the crane arm 6 between the two base plates 2 are: firstly, it allows for the use of the shortest possible crane arm 6 while ensuring the lifting range, resulting in the shortest lever arm and the least effort; secondly, it enables omnidirectional lifting, resulting in a more balanced weight distribution on the vehicle body 1 and preventing rollover accidents due to instability during lifting; and thirdly, the lateral working range of the crane arm can cover the area of ​​another transport vehicle parked side-by-side, enabling simultaneous lifting and transfer of both vehicles, improving transfer efficiency. Furthermore, combined with the side-by-side placement of the container 3, the crane arm 6 can lift any one of the container 3 without considering the lifting sequence, avoiding mutual interference or influence, and providing greater lifting flexibility compared to a longitudinally arranged container 3. The boom 6 includes a lifting head 7 for connecting the housing 3. The housing 3 has a lifting cover 4 that is detachably snapped onto the lifting head 7. At least two guide rails 21 are arranged parallel to each other along the width direction of the vehicle body 1 on the base plate 2. Each guide rail 21 has a snap-fit ​​mechanism that can extend to the outside of its side walls. The bottom of the housing 3 has multiple grooves corresponding to the guide rails 21. Arc-shaped grooves 31 that engage with the snap-fit ​​mechanisms are provided on the side walls of each groove. (See also...) Figures 5-10 The structure is shown. After the box 3 is hoisted onto the base plate 2 and the groove is aligned with the guide rail 21, the box 3 is fixed to the guide rail 21 by snapping with the arc groove 31 through the snap-fit ​​structure. Since there are at least two guide rails 21, the tilting of the box 3 in the forward, backward, left and right directions is restricted, thereby achieving the purpose of fixing the box 3 to the base plate. Example

[0040] This embodiment refines and explains the structure of the boom 6 based on embodiment 1. See attached document. Figures 1-3 , Figures 10-13 As shown, the boom 6 includes a base 61 fixedly connected to the vehicle body 1, a retractable longitudinal arm 62 rotatably mounted on the base 61, and a retractable transverse arm 64 hinged perpendicularly to the longitudinal arm 62. A lifting head 7 is fixedly connected to the retractable free end of the transverse arm 64. The transverse arm 64 and the longitudinal arm 62 are hinged near the lifting head 7 via a hydraulic cylinder 63. The extension and retraction of the hydraulic cylinder 63 causes the transverse arm 64 to deflect in the vertical plane. Through the 360° rotation and / or extension and retraction of the longitudinal arm 62, combined with the extension and retraction of the hydraulic cylinder 63, the pitch and deflection of the transverse arm 64 are achieved, thereby realizing 360° blind-spot-free operation.

[0041] To achieve compatibility and connection with lifting covers 4 at different locations and angles, please refer to [link / reference needed]. Figures 3-11 As shown, the lifting head 7 includes a bracket 71 fixedly installed at a 90° angle to the telescopic free end of the cross arm 64, as... Figure 11As shown, a first mounting plate 72 is fixedly mounted on the lower surface of the bracket 71. A second mounting plate 73 is also provided below the first mounting plate 72. The first mounting plate 72 and the second mounting plate 73 are connected by two second telescopic mechanisms 74 and a universal joint 75. A rotating mechanism 76 is installed in the middle of the second mounting plate 73. The output shaft of the rotating mechanism 76 passes through the second mounting plate 73 and is connected to a lifting plate 78 for engaging with the lifting cover 4. The universal joint 75 can adopt a double-axis cross hinge structure. Under the hinge action of the universal joint 75, the first mounting plate 72 and the second mounting plate 73 can achieve pitch deflection of the second mounting plate 73 relative to the first mounting plate 72 by simultaneously extending or shortening the two second telescopic mechanisms 74. The second mounting plate 73 can achieve roll rotation by differential second telescopic mechanisms 74. It should be noted that the roll / deflection described in this embodiment is based on the cross arm 64 as the axis.

[0042] In this embodiment, the second telescopic mechanism 74 includes a hydraulic rod that is hydraulically telescopic, and the lower end of the hydraulic rod is connected to the second mounting plate 73 through a ball joint 77; the universal mechanism is a universal joint or a ball joint structure.

[0043] To ensure a secure connection between the housing 3 and the lifting head 7 before hoisting, this embodiment provides a connection structure, as detailed in the appendix. Figures 11-13 As shown, a protruding limiting plate 781 is fixedly installed on the upper surface of the lifting plate 78 near both ends. A protruding limit switch 782 is installed on the limiting plate 781. An arc-shaped cavity 41 for accommodating the lifting plate 78 is provided on the lower surface of the lifting cover 4. A clearance groove 42 for accommodating the limiting plate 781 is provided at the top of the arc-shaped cavity 41. A blind hole for avoiding the limit switch 782 is also provided at the top of the clearance groove 42. The limit switch 782 is connected in series with an indicator light located in the driver's cab and the vehicle battery. See also... Figure 13As shown, the limit switch 782 will not be triggered by compression and will remain in its original state only when the limit plate 781 is fully located in the clearance groove 42 and the limit switch 782 is fully located in the blind hole. It should be noted that the original state can be either lit or off; the principle is the same. For example, if the indicator light is originally lit, it means the limit switch 782 is not triggered. When compressed, it will disconnect, and the indicator light will turn off. In this case, the off state indicates that the lifting plate 78 and the lifting cover 4 are not in the correct engagement / installation position, resulting in an unsafe state where lifting is not possible. Conversely, if the limit switch 782 is initially disconnected and is triggered by external compression, the indicator light will initially be off. When the limit switch 782 is triggered by external force, the indicator light will illuminate, also indicating an abnormal state. The angle of the lifting plate 78 needs to be adjusted further to ensure a perfect match with the lifting cover 4. Of course, while both methods mentioned above can serve as a safety measure, it is safer to have the limit switch 782 normally closed and the corresponding indicator light constantly on. This is because the indicator light remains on only when the limit switch 782 is in the correct position, with the lifting plate 78 fully positioned within the arc cavity, the limit plate 781 locked within the clearance groove 42, and the entire indicator light fully connected to the limit switch 782. Any other possible circuit fault or poor contact will cause the indicator light to go out, preventing the operator from lifting. This fundamentally avoids misoperation caused by uncontrollable factors affecting the indicator light's status. Alternatively, a manual switch can be connected in series in the indicator light circuit. When not performing lifting operations, turning off the manual switch will de-energize the entire indicator light circuit, keeping it in an inactive state and saving energy.

[0044] In this embodiment, the locking mechanism includes a first telescopic mechanism 8 disposed at the bottom of the base plate 2. The first telescopic mechanism 8 is connected to a pressure plate 9 disposed at the middle position of the guide rail 21 along the length direction of the guide rail 21. The upper surface of the pressure plate 9 is fixed and spaced apart with a plurality of locking pins 10 penetrating the guide rail 21. The upper end of each locking pin 10 is tapered or wedge-shaped. A horizontally disposed channel 22 is connected through the middle position of any vertical through hole accommodating the locking pin 10. The diameter of the hole where the channel 22 intersects with the two side walls of the guide rail 21 is smaller than the diameter of the hole inside the guide rail 21. A plurality of steel balls 23 abutting each other are disposed in the channel 22. The first telescopic mechanism 8 drives any one of the locking pins 10 to move vertically in the guide rail 21 through the pressure plate 9, causing the steel ball 23 to protrude to the outside of the two side walls of the guide rail 21 and engage with the arc-shaped groove 31 or retract into the channel 22, thereby loosening the housing 3 from the guide rail 21.

[0045] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A four-box combined logistics transport vehicle, comprising a vehicle body (1), wherein two base plates (2) are fixedly or rotatably connected to the vehicle body (1) and spaced apart along the front-rear direction of the vehicle body, and two boxes (3) are placed side by side on each of the base plates (2), the four boxes being arranged in a 2×2 matrix, characterized in that: A boom (6) for lifting the box (3) to the base plate (2) is fixedly installed on the vehicle body (1) at the middle position between the two base plates (2). The boom (6) can rotate 360° and the working range covers all four boxes on the two base plates. The boom (6) includes a lifting head (7) for connecting the box (3). The box (3) has a lifting cover (4) that can be detachably snapped into the lifting head (7). At least two guide rails (21) are arranged parallel to the width direction of the vehicle body (1) on the base plate (2). The guide rails (21) are provided with snapping mechanisms that can be extended to the outside of the two side walls of the guide rails (21). The bottom of the box (3) has multiple grooves that correspond to the guide rails (21). The two side walls of the grooves are provided with arc-shaped grooves (31) that snap into the snapping mechanisms. The locking mechanism includes a first telescopic mechanism (8) disposed at the bottom of the base plate (2). The first telescopic mechanism (8) is connected to a pressure plate (9) disposed at the middle position of the guide rail (21) along the length direction of the guide rail (21). The upper surface of the pressure plate (9) is fixed and spaced with a plurality of locking pins (10) penetrating the guide rail (21). The upper end of the locking pin (10) is tapered or wedge-shaped. The guide rail (21) is provided with a plurality of vertical through holes for accommodating the locking pins (10). The middle position of any vertical through hole penetrates the guide rail (21). A horizontally arranged channel (22) is connected through the channel (22). The diameter of the hole where the channel (22) intersects with the two side walls of the guide rail (21) is smaller than the diameter inside the guide rail (21). Multiple steel balls (23) are arranged in the channel (22) and abut against each other. The first telescopic mechanism (8) drives any one of the locking pins (10) to move vertically in the guide rail (21) through the pressure plate (9), so that the steel ball (23) protrudes to the outside of the two side walls of the guide rail (21) and engages with the arc groove (31) or retracts into the channel (22) to loosen the box (3) from the guide rail (21).

2. The four-box combined logistics transport vehicle according to claim 1, characterized in that: The boom (6) includes a base (61) fixedly connected to the vehicle body (1), a retractable longitudinal arm (62) rotatably mounted on the base (61), and a retractable transverse arm (64) vertically hinged to the longitudinal arm (62). The lifting head (7) is fixedly connected to the retractable free end of the transverse arm (64). The side of the transverse arm (64) near the lifting head (7) is hinged to the longitudinal arm (62) by a hydraulic cylinder (63). The transverse arm (64) is deflected in the vertical plane by the extension and retraction of the hydraulic cylinder (63).

3. A four-box combined logistics transport vehicle according to claim 2, characterized in that: The lifting head (7) includes a bracket (71) fixedly installed on the telescopic free end of the cross arm (64). The bracket (71) is at a 90° angle to the cross arm (64). A first mounting plate (72) is fixedly installed on the lower surface of the bracket (71). A second mounting plate (73) is also provided below the first mounting plate (72). The first mounting plate (72) and the second mounting plate (73) are connected by two second telescopic mechanisms (74) and a universal mechanism (75). A rotating mechanism (76) is installed in the middle of the second mounting plate (73). The output shaft of the rotating mechanism (76) passes through the second mounting plate (73) and is connected to a lifting plate (78) for engaging with the lifting cover (4).

4. A four-box combined logistics transport vehicle according to claim 3, characterized in that: The second telescopic mechanism (74) includes a hydraulic rod that is hydraulically telescopic, the lower end of which is connected to the second mounting plate (73) via a ball joint (77); the universal joint mechanism is a universal joint or a ball joint structure.

5. A four-box combined logistics transport vehicle according to claim 3, characterized in that: The upper surface of the lifting plate (78) is fixedly provided with a protruding limiting plate (781) near both ends. The limiting plate (781) is equipped with an outwardly protruding limit switch (782). The lower surface of the lifting cover (4) is provided with an arc-shaped cavity (41) for accommodating the lifting plate (78). The top of the arc-shaped cavity (41) is provided with a clearance groove (42) for accommodating the limiting plate (781). The top of the clearance groove (42) is also provided with a blind hole for avoiding the limit switch (782). The limit switch (782) is connected in series with the indicator light and the car battery located in the driver's cab.

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