A multi-functional operation vehicle adapted to box culvert maintenance

Abstract

The present application relates to the field of box culvert inspection car, especially to a multifunctional operation vehicle suitable for box culvert inspection, comprising a cab, a vehicle frame assembly, a driving suspension assembly, a steering system, a sensor mounting assembly, a hydraulic system, a lifting rack, a battery pack and a control system, the steering system is installed at the bottom of the vehicle frame assembly, the driving suspension assembly is installed at the lower side of the steering system, the driving suspension assembly is used to drive the vehicle frame assembly to move, the sensor mounting assembly for detecting the steering angle is installed on the steering system, the cab is installed at the upper front end of the vehicle frame assembly, the split structure design can satisfy the assembly in the box culvert after split hoisting, the complexity of hoisting operation is reduced, the multi-motor structure design is adopted for walking and steering, not only the steering and moving control is stable, but also the 360° steering in place can be realized, the overall operation flexibility is ensured.

Description

Technical Field

[0001] This invention relates to the field of maintenance vehicles for box culverts, and in particular to a multi-functional work vehicle adapted for box culvert maintenance. Background Technology

[0002] Water leakage in box culverts is a common and difficult problem to solve. Based on field experience in water leakage treatment and analysis of its patterns based on theoretical calculations, it can be confirmed that the main structural design of concrete box culverts for water conveyance projects is reliable, but there is a possibility of construction quality problems, such as insufficient compaction and cracks. Expansion joints are the main weak points; if not properly handled, water leakage may occur. Therefore, regular maintenance of box culverts is necessary. Currently, for the maintenance of underground culverts, engineering machinery such as tunnel construction electric locomotives, tunnel work trolleys, and articulated boom lifts are often used (e.g., an automatic maintenance system and method for tunnels, application number: CN202110666621.3; a system with lighting function, application number: CN202122995150.9). Tunnel safety maintenance vehicle equipment; ) Tunnel construction locomotives are currently mainly of two types: diesel engine and electric. Diesel engine locomotives have sufficient power and multiple trailers, making them suitable for transporting large quantities of construction materials. However, they require oxygen to support engine operation and emit a large amount of exhaust gas, causing environmental pollution. Due to the small space and poor air circulation inside the trunk culvert, diesel locomotives are not suitable for construction operations inside the culvert. Compared with diesel locomotives, electric locomotives have weaker power, and according to preliminary research, the current products have a climbing ability limit of 10°. The inverted siphon slope inside the culvert is relatively large, with a slope range of 9° to 23°. Although the overall size of the electric locomotive is smaller than that of the diesel locomotive, it still cannot meet the needs of driving inside the culvert. Moreover, the existing tunnel construction locomotives need to be hoisted into the culvert as a whole, and the hoisting operation is very troublesome. At the same time, due to the large size of the construction locomotive, it is not easy to make steering adjustments inside the culvert. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-functional work vehicle adapted for box culvert maintenance. Its overall structure is relatively simple, and it adopts a split-type structural design, which can meet the requirement of assembly inside the box culvert after split hoisting, reducing the complexity of hoisting operations. At the same time, the walking and steering adopts a multi-motor structure design, which not only makes the steering and movement control smooth, but also enables 360° turning on the spot, ensuring the overall operational flexibility.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A multi-functional work vehicle adapted for box culvert maintenance includes a cab, a frame assembly, a drive suspension assembly, a steering system, a sensor mounting assembly, a hydraulic system, a lifting platform, a battery pack, and a control system. The steering system is installed at the bottom of the frame assembly and is mounted together with it. The drive suspension assembly is installed below the steering system and is used to move the frame assembly. A sensor mounting assembly for detecting steering angle is installed on the steering system. The cab is installed at the upper front end of the frame assembly. A battery bracket is installed at the middle bottom of the frame assembly, and the battery pack is mounted on the battery bracket. The hydraulic system is installed on the lower part of the frame assembly and is mounted together with it. The lifting platform is installed on the upper part of the frame assembly for providing lifting operations for maintenance. The control system is installed on the rear side of the frame assembly body for controlling the operation of each actuator.

[0006] The frame assembly includes a frame body, frame guardrails, and a bottom mounting frame. The bottom mounting frame is installed inside the frame body and is welded to the frame body as a whole. Frame guardrails are provided along the edges of the frame body for protecting the frame body. Movable end plates are installed on the frame body and are installed together with the frame body by fastening bolts.

[0007] The drive suspension assembly includes a suspension body, a wheel hub, a drive motor, a secondary gear, a secondary gear shaft, a tertiary gear motor shaft, a main shaft gear, and a main wheel axle. The suspension body is connected to the steering system via a connector. The drive motor is mounted on the outside of the suspension body. A mounting cavity is provided on the suspension body. The secondary gear shaft and the tertiary gear motor shaft are mounted in the mounting cavity on the suspension body via bearings. The wheel hub is mounted on the suspension body via a connector. The main wheel axle is mounted on the wheel hub via bearings. A main shaft gear is mounted on the main wheel axle. A secondary gear is mounted on the secondary gear shaft. The secondary gear meshes with the tertiary gear motor shaft, and the main shaft gear meshes with the secondary gear shaft.

[0008] The steering system includes a motor reducer, a steering mounting frame, a steering housing, steering gears, a steering gear shaft, and a slewing support. The steering mounting frame is installed at the bottom of the vehicle frame assembly. The motor reducer is installed on the lower side of the steering mounting frame, and the steering housing is installed on the lower side of the motor reducer. The steering gear shaft is installed inside the steering housing via a support bearing. Steering gears are installed on the lower side of the steering gear shaft. The upper part of the steering gear shaft is connected to the power output end of the motor reducer. Slewing gears are machined on the slewing support, and the steering gears mesh with the slewing gears.

[0009] The sensor mounting assembly includes a sensor bracket, an angle sensor, a flexible coupling, and a connecting shaft. The bottom of the sensor bracket is mounted on the steering mounting frame by fastening bolts. An angle sensor is mounted on the sensor bracket to monitor the rotation angle of the flexible coupling. The upper part of the connecting shaft is equipped with the flexible coupling, and the lower side of the connecting shaft is connected to the drive suspension assembly.

[0010] Furthermore, the battery pack is used to provide power to the drive motor and motor reducer in the drive suspension assembly and steering system. The battery pack is connected to the drive motor and motor reducer in the drive suspension assembly and steering system through connecting lines.

[0011] Furthermore, the control system is used to control the drive motor and motor reducer in the drive suspension assembly and steering system. The control system is connected to the drive suspension assembly, the drive motor and motor reducer in the steering system respectively through control lines.

[0012] Furthermore, a lifting hydraulic cylinder for performing lifting operations is installed in the lifting platform. The hydraulic system is used to hydraulically control the lifting hydraulic cylinder in the lifting platform, and the hydraulic system is connected to the lifting hydraulic cylinder through hydraulic pipelines.

[0013] The beneficial effects of this invention are as follows: The overall structural design of the multi-functional work vehicle adapted for box culvert maintenance is scientific, and compared with existing tunnel construction vehicles for box culvert maintenance, it has the following technical features and advantages:

[0014] 1. Simple structure; Compared with existing tunnel construction locomotives for box culvert maintenance, this invention greatly reduces the number of components, and can achieve the box culvert maintenance operation function with a minimum number of components in actual use.

[0015] 2. It can achieve split hoisting, which is convenient for hoisting and installation; the main mechanical components such as the cab, frame assembly, hydraulic system and lifting platform in this invention can be hoisted separately. After hoisting, they can be assembled in the box culvert. Compared with the overall hoisting of existing box culvert maintenance tunnel construction locomotives, its hoisting operation is extremely flexible and convenient, greatly simplifying the hoisting operation process of the whole vehicle and achieving a high-efficiency hoisting operation effect.

[0016] 3. High controllability and flexible operation: The drive system and steering system of the multi-functional work vehicle adapted for box culvert maintenance in this invention use a stationary brushless motor to provide execution power, which has high control performance. It can achieve flexible 360° angle adjustment in place in the box culvert. At the same time, it adopts a four-wheel independent walking mechanism design, which has strong moving power and can be used for walking conditions with a slope range of 9° to 23° in the box culvert. Attached Figure Description

[0017] Figure 1 This is a front view structural schematic diagram of the multi-functional work vehicle for box culvert maintenance according to the present invention;

[0018] Figure 2 This is a side view structural schematic diagram of the multi-functional work vehicle for box culvert maintenance of the present invention;

[0019] Figure 3 This is a top view of the layout of the multi-functional work vehicle for box culvert maintenance according to the present invention.

[0020] Figure 4 This is a schematic diagram of the drive suspension assembly in this invention;

[0021] Figure 5 This is a schematic diagram of the steering system in this invention;

[0022] Figure 6 This is a schematic diagram of the sensor mounting assembly in this invention;

[0023] Figure 7 This is a structural schematic diagram of the frame assembly in this invention;

[0024] Figure 8 This is a control principle diagram of the hydraulic system in this invention;

[0025] The diagram is labeled as follows: 1-Cab, 2-Frame assembly, 3-Drive suspension assembly, 4-Steering system, 5-Sensor mounting assembly, 6-Swing beam, 7-Lifting platform, 8-Battery pack, 9-Control system, 21-Frame body, 22-Frame guardrail, 23-Bottom mounting frame, 31-Suspension body, 32-Wheel hub, 33-Drive motor, 34-Secondary gear, 35-Secondary gear shaft, 36-Third gear motor shaft, 37-Main shaft gear, 38-Main wheel axle, 41-Motor reducer, 42-Steering mounting bracket, 43-Steering housing, 44-Steering gear, 45-Steering gear shaft, 46-Slewing bearing, 51-Sensor bracket, 52-Angle sensor, 53-Flexible coupling, 54-Connecting shaft. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on or indirectly on that other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to that other element. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality of" means two or more unless otherwise explicitly specified. "Several" means one or more unless otherwise explicitly specified. In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and 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, and therefore should not be construed as a limitation of the invention. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] Specific Implementation Example 1: Addressing the problems of existing tunnel engineering vehicles being large, inconvenient for hoisting and placement, and lacking maneuverability within box culverts, thus failing to meet the maintenance requirements of box culverts, this invention designs a multi-functional work vehicle suitable for box culvert maintenance. Its overall structure is relatively simple, employing a modular design that allows for assembly within the box culvert after separate hoisting, reducing the complexity of vehicle hoisting operations. The walking and steering systems utilize a multi-motor design, ensuring smooth steering and movement control, and enabling 360° turning on the spot, guaranteeing overall operational flexibility. (See the appendix to this invention's specification.) Figure 1 Instruction manual attached Figure 2 and instruction manual attached Figure 3As shown, the present invention provides a multi-functional work vehicle adapted for box culvert maintenance. This multi-functional work vehicle mainly includes a cab 1, a frame assembly 2, a drive suspension assembly 3, a steering system 4, a sensor mounting assembly 5, a hydraulic system, a lifting platform 7, a battery pack 8, and a control system 9. The steering system 4 drives the drive suspension assembly 3 to rotate 360° in place. During installation, the steering system 4 is mounted at the bottom of the frame assembly 2 and is installed together with the frame assembly 2. The drive suspension assembly 3 is mounted on the lower side of the steering system 4. The dynamic suspension assembly 3 is used to move the frame assembly 2. A sensor mounting assembly 5 for detecting the steering angle is installed on the steering system 4. The cab 1 is installed at the upper front end of the frame assembly 2. The battery bracket is installed at the middle bottom of the frame assembly 2. During installation, the battery pack 8 is installed on the battery bracket. The hydraulic system is installed on the lower part of the frame assembly 2 and is installed together with the frame assembly 2. The lifting platform 7 is installed on the upper part of the frame assembly 2 to provide lifting operations for maintenance. The control system 9 is installed on the rear side of the frame assembly 2 body to control the operation of each actuator.

[0028] As per the appendix to the specification of this invention Figure 7 As shown, the frame assembly 2 of the present invention includes a frame body 21, a frame guardrail 22, and a bottom mounting frame 23. The bottom mounting frame 23 is installed inside the frame body 21 and is welded to the frame body 21 as a whole. The frame guardrail 22 is provided on the edge of the frame body 21 to provide protection. The frame guardrail 22 is used to protect the frame body 21. A movable sealing plate is installed on the frame body 21 to perform sealing protection. The movable sealing plate is installed together with the frame body 21 by fastening bolts.

[0029] As per the appendix to the specification of this invention Figure 4 As shown, the drive suspension assembly 3, used to move the frame assembly 2, includes a suspension body 31, a wheel hub 32, a drive motor 33, a secondary gear 34, a secondary gear shaft 35, a tertiary gear motor shaft 36, a main shaft gear 37, and a main wheel axle 38. The suspension body 31 is connected to the steering system 4 via a connector. The drive motor 33, which provides driving force, is mounted on the outside of the suspension body 31. A mounting cavity for mounting transmission components is provided on the suspension body 31. The secondary gear shaft 35 and the tertiary gear motor shaft 36 are mounted in the mounting cavity on the suspension body 31 via bearings. The wheel hub 32 is mounted on the suspension body 31 via a connector. The main wheel axle 38 is mounted on the wheel hub 32 via bearings. The main shaft gear 37 is mounted on the main wheel axle 38. The secondary gear 34 is mounted on the secondary gear shaft 35. During operation, the secondary gear 34 meshes with the tertiary gear motor shaft 36, and the main shaft gear 37 meshes with the secondary gear shaft 35.

[0030] As per the appendix to the specification of this invention Figure 5 As shown, the steering system 4 used to drive the drive suspension assembly 3 for steering adjustment includes a motor reducer 41, a steering mounting frame 42, a steering housing 43, steering gears 44, a steering gear shaft 45, and a slewing support 46. The steering mounting frame 42 is mainly used to install and support the motor reducer 41 and the slewing support 46. The steering mounting frame 42 is installed at the bottom of the frame assembly 2. The motor reducer 41 is installed on the lower side of the steering mounting frame 42. The steering housing 43, which is adapted to the steering gear shaft 45, is installed on the lower side of the motor reducer 41. The steering gear shaft 45 is installed in the steering housing 43 through a support bearing. The steering gears 44 are installed on the lower side of the steering gear shaft 45. During installation, the upper part of the steering gear shaft 45 is connected to the power output end of the motor reducer 41. A slewing gear is machined on the slewing support 46, wherein the steering gears 44 mesh with the slewing gears.

[0031] As per the appendix to the specification of this invention Figure 6 As shown, the sensor mounting assembly 5 for detecting the rotation angle of the drive suspension assembly 3 includes a sensor bracket 51, an angle sensor 52, a flexible coupling 53, and a connecting shaft 54. The bottom of the sensor bracket 51 is mounted on the steering mounting frame 42 by fastening bolts. The angle sensor 52, which performs the detection operation, is mounted on the sensor bracket 51. The angle sensor 52 can detect the rotation angle of the flexible coupling 53. The flexible coupling 53 is mounted on the upper part of the connecting shaft 54. During installation, the lower side of the connecting shaft 54 ​​is connected to the drive suspension assembly 3.

[0032] The installation and use process of the multi-functional work vehicle adapted for box culvert maintenance of the present invention is as follows: First, it should be noted that the main mechanical components of the present invention, such as the cab 1, frame assembly 2, hydraulic system, and lifting platform 7, adopt a split structure design. These main mechanical components can be lifted separately using hoisting equipment. After hoisting, they can be assembled inside the box culvert. During installation, the operator can install the drive suspension assembly 3, located at the front of the frame assembly 2, on the lower side of the frame assembly 2 via a swing beam 6. The swing beam 6 is installed on the lower side of the frame assembly 2 and hinged to the frame assembly 2 via a pin. Drive suspension assemblies 3 are installed on the lower parts of both sides of the swing beam 6. The rear drive suspension assembly 3 is installed independently at the rear. At this time, the vehicle is supported by three points, which avoids the slippage caused by the four-point statically indeterminate system. The cab 1 and the lifting platform 7 are installed on the upper part of the frame assembly 2. The battery pack 8 is used to provide power to the drive motor 33 and motor reducer 41 in the drive suspension assembly 3 and the steering system 4. The battery pack 8 is connected to the drive motor 33 and motor reducer 41 in the drive suspension assembly 3 and the steering system 4 through connecting lines. The control system 9 is used to control the drive motor 33 and motor reducer 41 in the drive suspension assembly 3 and the steering system 4. The control system 9 is connected to the drive motor 33 and motor reducer 41 in the drive suspension assembly 3 and the steering system 4 respectively through control lines.

[0033] As per the instruction manual Figure 8 As shown, a lifting hydraulic cylinder for performing lifting operations is installed in the lifting platform 7 (the lifting hydraulic cylinder can achieve the up-and-down lifting function of the platform by lifting the lifting platform 7). The hydraulic system is used to hydraulically control the lifting hydraulic cylinder in the lifting platform 7. The hydraulic system is connected to the lifting hydraulic cylinder through hydraulic pipelines. After the above installation process is completed, the operator can perform the following functions control on the multi-functional trolley of the present invention:

[0034] I. Walking Status Control

[0035] The operator can send a travel drive control command to the control system 9 through the control buttons in the cab 1. After receiving the travel drive information, the control system 9 sends a travel drive control signal to the drive motor 33 in the drive suspension assembly 3. At this time, under the command of the travel drive control signal, the drive motor 33 can drive the three-stage gear motor shaft 36 to rotate. The three-stage gear motor shaft 36 can drive the two-stage gear 34 to rotate. The rotation of the two-stage gear 34 drives the two-stage gear shaft 35 to rotate. The two-stage gear shaft 35 drives the main shaft gear 37 to rotate. At this time, the main shaft gear 37 drives the main wheel shaft 38 to rotate. A travel wheel is installed at the outer end of the main wheel shaft 38. The main wheel shaft 38 can drive the travel wheel to move. At this time, the frame assembly 2 arranged on the drive suspension assembly 3 can move forward or backward.

[0036] II. Steering Status Control

[0037] The operator can send steering drive control commands to the control system 9 via the control buttons in the cab 1. After receiving the steering drive information, the control system 9 synchronously sends a steering drive control signal to the motor reducer 41 in the steering system 4. At this time, under the command of the steering drive control signal, the motor reducer 41 drives the steering gear shaft 45 mounted on it to rotate. The steering gear shaft 45 drives the steering gear 44 to rotate. Since the upper part of the steering gear shaft 45 is connected to the power output end of the motor reducer 41 during installation, a rotary gear is machined on the slewing support 46. The steering gear 44 meshes with the rotary gear. At this time, the steering gear 44 drives the slewing support 46 to rotate. The slewing support 46 drives the drive suspension assembly 3 mounted below it to rotate and adjust its angle. That is, under the drive of the slewing support 46, the drive suspension assembly 3 can achieve a 360° angle adjustment in its original position by driving the traveling wheels mounted on it, thereby realizing the position and steering adjustment of the entire multi-functional vehicle.

[0038] The overall layout of the multi-functional transport vehicle is as follows: It features a detachable cab 1; a two-axle layout; a front axle suspension with a balance beam; four suspension sets with all-drive wheels and all-braking wheels; a four-point suspension with independent steering, enabling turning on the spot and diagonal travel; detachable guardrails on both sides of the frame; a scissor-type lifting platform in the middle; three ultrasonic radars at the front and rear, and one ultrasonic radar on each side; four cameras around the perimeter for panoramic monitoring; front headlights; and three-color lights (headlights, brake lights, and turn signals) at the rear. The cab 1 contains three displays: a main vehicle system display, a monitoring screen, and a battery monitoring information screen. The main vehicle uses lithium iron phosphate batteries for power and a permanent magnet DC motor as the main power unit. A towing hook is located at the rear, capable of towing submersible pump trolleys, cable reel trolleys, and hose reel trolleys.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A multi-functional work vehicle adapted for box culvert maintenance, characterized in that, The system includes a cab (1), a frame assembly (2), a drive suspension assembly (3), a steering system (4), a sensor mounting assembly (5), a hydraulic system, a lifting platform (7), a battery pack (8), and a control system (9). The steering system (4) is installed at the bottom of the frame assembly (2) and is mounted together with the frame assembly (2). The drive suspension assembly (3) is installed on the lower side of the steering system (4). The drive suspension assembly (3) is used to move the frame assembly (2). A sensor mounting assembly is installed on the steering system (4) for... The sensor mounting assembly (5) for detecting steering angle is installed. The cab (1) is installed at the upper front end of the frame assembly (2). The battery bracket is installed at the middle bottom of the frame assembly (2). The battery pack (8) is installed on the battery bracket. The hydraulic system is installed on the lower part of the frame assembly (2) and is installed together with the frame assembly (2). The lifting platform (7) is installed on the upper part of the frame assembly (2) to provide lifting operations for maintenance. The control system (9) is installed on the rear side of the frame assembly (2) to control the operation of each actuator. The cab (1), frame assembly (2), hydraulic system and lifting platform (7) adopt a split structure design. They are lifted separately by lifting machinery and can be assembled in the box tube after the lifting is completed. During the specific installation, the drive suspension assembly (3) located in front of the frame assembly (2) is installed on the lower side of the frame assembly (2) through the swing beam (6). The swing beam (6) is installed on the lower side of the frame assembly (2) and is hinged to the frame assembly (2) through the pin. The drive suspension assembly (3) is installed on the lower part of both sides of the swing beam (6). The rear drive suspension assembly (3) is installed independently on the lower rear part of the frame assembly (2). At this time, the whole vehicle is supported by three points, which avoids the slippage caused by the four-point statically indeterminate system. The steering system (4) includes a motor reducer (41), a steering mounting frame (42), a steering housing (43), steering gears (44), a steering gear shaft (45), and a slewing support (46). The steering mounting frame (42) is installed at the bottom of the frame assembly (2). The motor reducer (41) is installed on the lower side of the steering mounting frame (42). The steering housing (43) is installed on the lower side of the motor reducer (41). The steering gear shaft (45) is installed in the steering housing (43) through a support bearing. The steering gears (44) are installed on the lower side of the steering gear shaft (45). The upper part of the steering gear shaft (45) is connected to the power output end of the motor reducer (41). A slewing gear is machined on the slewing support (46). The steering gears (44) mesh with the slewing gears. The sensor mounting assembly (5) includes a sensor bracket (51), an angle sensor (52), a flexible coupling (53), and a connecting shaft (54). The bottom of the sensor bracket (51) is mounted on the steering mounting frame (42) by fastening bolts. An angle sensor (52) is mounted on the sensor bracket (51). The angle sensor (52) can monitor the rotation angle of the flexible coupling (53). The upper part of the connecting shaft (54) is equipped with the flexible coupling (53). The lower side of the connecting shaft (54) is connected to the drive suspension assembly (3).

2. The multi-functional work vehicle adapted for box culvert maintenance according to claim 1, characterized in that, The frame assembly (2) includes a frame body (21), a frame guardrail (22), and a bottom mounting frame (23). The bottom mounting frame (23) is installed inside the frame body (21) and is welded to the frame body (21). The frame guardrail (22) is provided on the edge of the frame body (21) and is used to protect the frame body (21). A movable sealing plate is installed on the frame body (21) and is installed together with the frame body (21) by fastening bolts.

3. A multi-functional work vehicle adapted for box culvert maintenance according to claim 2, characterized in that, The drive suspension assembly (3) includes a suspension body (31), a wheel hub (32), a drive motor (33), a secondary gear (34), a secondary gear shaft (35), a tertiary gear motor shaft (36), a main shaft gear (37), and a main wheel shaft (38). The suspension body (31) is connected to the steering system (4) via a connector. The drive motor (33) is mounted on the outside of the suspension body (31). An installation cavity is provided on the suspension body (31). The secondary gear shaft (35) and the tertiary gear motor... The shaft (36) is mounted in the mounting cavity on the suspension body (31) by bearings. The hub (32) is mounted on the suspension body (31) by connecting parts. The main wheel shaft (38) is mounted on the hub (32) by bearings. A main shaft gear (37) is mounted on the main wheel shaft (38). A secondary gear (34) is mounted on the secondary gear shaft (35). The secondary gear (34) meshes with the third-stage gear motor shaft (36). The main shaft gear (37) meshes with the secondary gear shaft (35).

4. A multi-functional work vehicle adapted for box culvert maintenance according to claim 3, characterized in that, Furthermore, the battery pack (8) is used to provide power to the drive motor (33) and motor reducer (41) in the drive suspension assembly (3) and steering system (4). The battery pack (8) is connected to the drive motor (33) and motor reducer (41) in the drive suspension assembly (3) and steering system (4) through connecting lines.

5. A multi-functional work vehicle adapted for box culvert maintenance according to claim 4, characterized in that, Furthermore, the control system (9) is used to control the drive motor (33) and motor reducer (41) in the drive suspension assembly (3) and steering system (4). The control system (9) is connected to the drive motor (33) and motor reducer (41) in the drive suspension assembly (3) and steering system (4) respectively through control lines.

6. A multi-functional work vehicle adapted for box culvert maintenance according to claim 1, characterized in that, Furthermore, a lifting hydraulic cylinder for performing lifting operations is installed in the lifting platform (7). The hydraulic system is used to hydraulically control the lifting hydraulic cylinder in the lifting platform (7). The hydraulic system is connected to the lifting hydraulic cylinder through hydraulic pipelines.

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