Multifunctional green belt maintenance vehicle

By designing a multifunctional green belt maintenance vehicle and utilizing a combination of a sliding seat, a fixed blade holder, a movable blade holder, and an infrared sensor, efficient and automatic pruning of green belt bushes is achieved, solving the problems of high labor intensity and potential safety hazards, and ensuring the integrity and safety of pruning.

CN223452481UActive Publication Date: 2025-10-21ANHUI ZHONGHUAN ECOLOGICAL GARDEN GRP CO LTD
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Patent Information

Application Number
CN202422521758.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-18
Publication Date
2025-10-21
Estimated Expiration
2034-10-18

AI Technical Summary

Technical Problem

In the prior art, pruning bushes in green belts is labor-intensive and can easily cause tree trunk collisions due to manual operation, posing a safety hazard.

Method used

A multifunctional green belt maintenance vehicle is designed, which is equipped with a sliding seat, a fixed blade holder, a movable blade holder, an infrared distance sensor and a reciprocating component. The sensor detects the position of the tree trunk, automatically adjusts the blade position to avoid collision, and achieves efficient pruning through reciprocating motion.

Benefits of technology

It reduces the labor intensity of the staff, avoids collision with tree trunks, and ensures the integrity and safety of bush pruning.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the technical field of green belt maintenance, and discloses a multifunctional green belt maintenance vehicle which comprises a cart and a fixing plate, a sliding seat and a driving assembly are slidably arranged on the fixing plate, a fixed knife rest is horizontally arranged on one side of the sliding seat, a plurality of fixed blades are arranged on one side of the fixed knife rest at intervals, and a movable knife rest is slidably arranged at the top of the fixed knife rest. A reciprocating assembly is arranged on the sliding seat, a first mounting rod is arranged on the sliding seat, a second mounting rod is arranged at one end of the first mounting rod, a plurality of first infrared distance sensors are arranged on the first mounting rod at intervals, and a second infrared sensor is arranged on the second mounting rod. The reciprocating assembly drives the movable knife rest to reciprocate to drive the movable blade to reciprocate and is matched with the fixed blade to cut off branches or leaves; the first infrared distance sensor detects the distance of an object in the moving direction of the cart, and collision with a trunk is avoided.
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Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of green belt maintenance, especially relates to a multifunctional green belt maintenance vehicle. BACKGROUND

[0002] Green belt refers to a strip-shaped land for greening. It can eliminate visual fatigue, purify the environment, beautify the city, reduce traffic accidents and has other functions, and occupies an irreplaceable important position in the city. The green belt separates traffic and has a safety function. The green belt has the effect of beautifying the city, eliminating the visual fatigue of drivers, and planting arbor green belts can also change the spatial scale of the road, making the road space have a good width-height ratio. In addition, it also has the effect of purifying the environment, can slow down dust, reduce noise, absorb harmful gases and release oxygen. The green belt is usually composed of low shrubs and higher trees planted in the shrubs.

[0003] The low shrubs need to be regularly pruned to keep the plants neat and the appropriate size, and improve the aesthetics of the green belt. For green belts near roads, sidewalks or other public facilities, regular pruning can prevent plants from blocking vision or hindering pedestrian and vehicle traffic. Currently, when pruning shrubs, workers usually use scissors or hedge trimmers, which is labor-intensive. UTILITARIAN CONTENT

[0004] In order to solve the above problems, the utility model provides a multifunctional green belt maintenance vehicle.

[0005] The above technical purpose of the utility model is realized by the following technical scheme: a multifunctional green belt maintenance vehicle, including a cart, a fixed plate is horizontally arranged on the cart, a sliding seat is slidably arranged on the fixed plate along the length direction of the fixed plate, a driving assembly for driving the sliding seat to slide is further arranged on the fixed plate, a fixed knife holder is horizontally arranged on one side of the sliding seat, a plurality of fixed blades are arranged on one side of the fixed knife holder along the length direction of the fixed knife holder, a movable knife holder is slidably arranged on the top of the fixed knife holder along the length direction of the fixed knife holder, a movable blade is arranged on the movable knife holder corresponding to the fixed blade, a reciprocating assembly for driving the movable knife holder to reciprocate is arranged on the sliding seat, a first mounting rod parallel to the fixed knife holder is arranged on the sliding seat, a second mounting rod is arranged on the end of the first mounting rod away from the sliding seat, the length direction of the second mounting rod is perpendicular to the length direction of the second mounting rod, a plurality of first infrared distance sensors are arranged on the first mounting rod, and a second infrared sensor is arranged on the second mounting rod.

[0006] When the bushes need to be pruned, the cart is pushed to the side of the green belt, the sliding seat is driven to move by the driving assembly, the fixed knife holder, the movable knife holder and the first mounting rod are all located on the bushes, then the movable knife holder is driven to move reciprocatingly by the reciprocating assembly to drive the movable blade to move reciprocatingly, the cart is further pushed, the movable blade moves reciprocatingly and is cooperated with the fixed blade to cut off the branches or leaves; when the cart moves, the first infrared distance sensors detect the distance of the objects in the moving direction of the cart, when the values of the first infrared distance sensors continuously decrease, it indicates that there is a higher tree trunk in front, when the values of the first infrared distance sensors reach the dangerous values, the driving assembly drives the sliding seat, the fixed knife holder and the movable knife holder to move until the values of all the first infrared distance sensors return to normal; when the value of the second infrared sensor suddenly decreases and then returns to normal, it indicates that the fixed blade and the movable blade pass through the tree trunk, the driving assembly drives the sliding seat, the fixed blade and the movable blade to reset to avoid collision with the tree trunk and ensure that the bushes between the tree trunks can also be pruned, and meanwhile, the staff only needs to control the cart, thereby reducing the labor intensity of the staff.

[0007] Further, the first mounting rod is flush with the outer end of the movable knife holder when the movable knife holder reciprocates to the farthest position, and one of the first infrared distance sensors is arranged at the end of the first mounting rod away from the sliding seat.

[0008] By arranging the first mounting rod to be flush with the outer end of the movable knife holder when the movable knife holder reciprocates to the farthest position, the measurement position of one of the first infrared distance sensors is ensured to be above the outer end of the movable knife holder when the movable knife holder reciprocates to the farthest position, and collision between the outer end of the movable knife holder and the tree trunk is avoided.

[0009] Further, the second mounting rod is flush with the side of the fixed knife holder away from the fixed blade at the end of the second mounting rod away from the first mounting rod, and the second infrared sensor is arranged at the end of the second mounting rod away from the first mounting rod.

[0010] By arranging the second mounting rod to be flush with the side of the fixed knife holder away from the fixed blade at the end of the second mounting rod away from the first mounting rod, the second infrared sensor can be ensured to be detected in time after the fixed knife holder and the movable knife holder pass through the tree trunk.

[0011] Further, the reciprocating assembly comprises a reciprocating motor vertically arranged on the sliding seat, an output shaft of the reciprocating motor is downwardly arranged and provided with a rotating disc, a fixed shaft is vertically arranged at the bottom of the rotating disc near the edge of the rotating disc, a vertical shaft is vertically arranged at one end of the movable knife holder near the sliding seat, a connecting plate is arranged between the vertical shaft and the fixed shaft, one end of the connecting plate is rotationally connected with the vertical shaft and the other end is rotationally connected with the fixed shaft.

[0012] By adopting the above technical scheme, the reciprocating motor, the rotating disc, the fixed shaft, the vertical shaft and the connecting plate are arranged, the rotating disc is driven to rotate by the reciprocating motor, the fixed shaft is driven to rotate around the center of the rotating disc, the connecting plate is driven to move, and the movable knife holder is driven to reciprocate.

[0013] Further, the fixed knife holder is provided with a plurality of strip-shaped holes along the length direction thereof, the length direction of the strip-shaped holes is consistent with the length direction of the fixed knife holder, the movable knife holder is provided with a slide rod corresponding to the strip-shaped hole at the bottom, the slide rod passes through the corresponding strip-shaped hole respectively, the slide rod is provided with a baffle at the bottom, and the baffle is in sliding contact with the bottom surface of the fixed knife holder.

[0014] By adopting the above technical scheme, the strip-shaped hole, the slide rod and the baffle are arranged, and the stable sliding of the movable knife holder is ensured.

[0015] Further, the fixed plate is provided with two slide rails at intervals, and the sliding seat is in sliding connection with the two slide rails.

[0016] By adopting the above technical scheme, the two slide rails are arranged at intervals on the fixed plate, and the stability of the sliding of the sliding seat is ensured.

[0017] Further, the driving assembly comprises a driving motor arranged horizontally on one side of the fixed plate, the fixed plate is provided with vertical plates at two ends, a threaded rod is rotatably arranged between the two vertical plates, the length direction of the threaded rod is consistent with the length direction of the fixed plate, the sliding seat is in screwing cooperation with the threaded rod through a threaded hole, and one end of the threaded rod passes through the vertical plate and is connected with the output shaft of the driving motor.

[0018] By adopting the above technical scheme, the driving motor, the vertical plate and the threaded rod are arranged, the threaded rod is driven to rotate by the driving motor, and the sliding seat is driven to slide due to the screwing cooperation between the sliding seat and the threaded rod through the threaded hole.

[0019] In summary, the utility model has the following beneficial effects:

[0020] 1、In this application, when the need to trim the shrubs, the cart is pushed to the side of the green belt, and the sliding seat is driven to move by the driving assembly, so that the fixed knife holder, the moving knife holder, the first mounting rod are located on the shrubs, then start the reciprocating assembly to drive the moving knife holder to reciprocate, and the moving knife blade reciprocates, and the fixed blade cooperates to cut the branches or leaves; When the cart moves, the first infrared distance sensor detects the distance of the object in the moving direction of the cart, when the value of the first infrared distance sensor is continuously reduced, it means that there is a higher tree trunk in front, when the value of the first infrared distance sensor feedback reaches the dangerous value, the driving assembly drives the sliding seat, the fixed knife holder and the moving knife holder to move, until the value of all first infrared distance sensors returns to normal; When the value of the second infrared sensor suddenly becomes smaller and then returns to normal, it indicates that the fixed blade and the moving blade pass through the tree trunk, and the driving assembly drives the sliding seat, the fixed blade and the moving blade to reset, to avoid collision with the tree trunk and ensure that the shrubs between the tree trunks can also be trimmed. At the same time, the staff only needs to control the cart, which reduces the labor intensity of the staff;

[0021] 2、In this application, the first mounting rod is flush with the outer end of the moving knife holder when it is reciprocated to the farthest position, so as to ensure that the measurement position of one of the first infrared distance sensors is directly above the outer end of the moving knife holder when it is reciprocated to the farthest position, avoiding collision between the outer end of the moving knife holder and the tree trunk;

[0022] 3、In this application, the second mounting rod is flush with the side of the fixed knife holder away from the fixed blade, so that the second infrared sensor can detect in time after the fixed knife holder and the moving knife holder pass through the tree trunk. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the overall structure schematic diagram of the embodiment of the utility model;

[0024] Figure 2 It is the structure schematic diagram of the fixed plate, the sliding seat and the driving assembly part of the embodiment of the utility model;

[0025] Figure 3 It is the structure schematic diagram of the sliding seat and the reciprocating assembly part of the embodiment of the utility model;

[0026] Figure 4 It is the structure schematic diagram of the reciprocating motor, the turntable and the connecting plate part of the embodiment of the utility model;

[0027] Figure 5 It is the structure schematic diagram of the fixed knife holder and the moving knife holder part of the embodiment of the utility model.

[0028] In the figure: 10, cart; 11, fixed plate; 12, sliding seat; 13, slide rail; 20, drive assembly; 21, drive motor; 22, vertical plate; 23, threaded rod; 30, fixed knife holder; 31, fixed blade; 32, movable knife holder; 33, movable blade; 34, strip hole; 35, slide rod; 36, baffle; 40, reciprocating assembly; 41, reciprocating motor; 42, turntable; 43, fixed shaft; 44, vertical shaft; 45, connecting plate; 50, first mounting rod; 51, second mounting rod; 52, first infrared distance sensor; 53, second infrared sensor. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; it is obvious that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0030] like Figures 1-5 As shown, the embodiment of the present application discloses a multifunctional green belt maintenance vehicle, including a cart 10, a fixed plate 11, a sliding seat 12, a drive assembly 20, and a reciprocating assembly 40. The cart 10 can be manually propelled or electrically driven. The fixed plate 11 is horizontally arranged on the cart 10, and the length direction of the fixed plate 11 is perpendicular to the forward direction of the cart 10. The sliding seat 12 is slidably arranged on the fixed plate 11 along the length direction of the fixed plate 11. The drive assembly 20 is arranged on the fixed plate 11 and is used to drive the sliding seat 12 to slide. A fixed blade holder 30 is horizontally arranged on one side of the sliding seat 12. The fixed blade holder 30 is provided with a plurality of fixed blades 31 spaced apart along the length direction of the fixed blade holder 30 on the side of the moving direction of the cart 10. A movable blade holder 32 is slidably arranged on the top of the fixed blade holder 30 along its length direction. A movable blade 33 is provided on the movable blade holder 32 corresponding to the fixed blade 31. The reciprocating assembly 40 is arranged on the sliding seat 12 and is used to drive the movable blade holder 32 to reciprocate. When the bushes need to be trimmed, the cart 10 is pushed to one side of the green belt, and the driving assembly 20 drives the sliding seat 12 to move, so that the fixed blade holder 30 and the movable blade holder 32 are both located on the green belt. Then the reciprocating assembly 40 is started to drive the movable blade holder 32 to move back and forth, driving the movable blade 33 to move back and forth, and then the cart 10 is pushed, and the movable blade 33 moves back and forth, cooperating with the fixed blade 31 to cut the branches or leaves.

[0031] Specifically, the sliding seat 12 is provided with a first mounting rod 50 parallel to the fixed knife holder 30, and the height of the first mounting rod 50 is higher than that of the fixed knife holder 30. A plurality of first infrared distance sensors 52 are arranged on the first mounting rod 50 at intervals, and the end of the first mounting rod 50 away from the sliding seat 12 is flush with the outer end of the movable knife holder 32 when the movable knife holder 32 reciprocates to the farthest position. One of the first infrared distance sensors 52 is arranged at the end of the first mounting rod 50 away from the sliding seat 12, so that the measurement position of the one of the first infrared distance sensors 52 is directly above the outer end of the movable knife holder 32 when the movable knife holder 32 reciprocates to the farthest position, avoiding collision between the outer end of the movable knife holder 32 and the tree trunk. The end of the first mounting rod 50 away from the sliding seat 12 is provided with a second mounting rod 51, the length direction of the second mounting rod 51 is perpendicular to the length direction of the second mounting rod 51, and the second mounting rod 51 is provided with a second infrared sensor 53. The end of the second mounting rod 51 away from the first mounting rod 50 is flush with the side of the fixed knife holder 30 away from the fixed blade 31, and the second infrared sensor 53 is arranged at the end of the second mounting rod 51 away from the first mounting rod 50, so that the second infrared sensor 53 can be detected in time after the fixed knife holder 30 and the movable knife holder 32 pass through the tree trunk. When the cart 10 moves, the plurality of first infrared distance sensors 52 detect the distance of the object in the moving direction of the cart 10, and when the values of some of the first infrared distance sensors 52 continuously decrease, it indicates that there is a higher tree trunk in front. When the value of the first infrared distance sensor 52 reaches a dangerous value, the driving assembly 20 drives the sliding seat 12, the fixed knife holder 30 and the movable knife holder 32 to move until the values of all the first infrared distance sensors 52 return to normal; when the value of the second infrared sensor 53 suddenly decreases and then returns to normal, it indicates that the fixed blade 31 and the movable blade 33 have passed through the tree trunk, and the driving assembly 20 drives the sliding seat 12, the fixed blade 31 and the movable blade 33 to reset, avoiding collision with the tree trunk and ensuring that the shrubs between the tree trunks can also be trimmed. At the same time, the staff only needs to control the cart 10, reducing the labor intensity of the staff. The dangerous value is a distance value, and when the value of the first infrared distance sensor 52 is consistent with the dangerous value, it means that the movable knife holder 32 and the fixed knife holder 30 are very close to the tree trunk.

[0032] When setting, the fixed plate 11 is provided with two slide rails 13 at intervals, and the sliding seat 12 is slidably connected with the two slide rails 13, so as to ensure the stability of the sliding of the sliding seat 12. The driving assembly 20 comprises a driving motor 21 horizontally arranged on one side of the fixed plate 11, and the fixed plate 11 is provided with two vertical plates 22 at the two ends. The two vertical plates 22 are rotatably provided with a threaded rod 23 therebetween, the length direction of the threaded rod 23 is consistent with the length direction of the fixed plate 11, the sliding seat 12 is screwedly connected with the threaded rod 23 through a threaded hole, one end of the threaded rod 23 penetrates through the vertical plate 22 and is connected with the output shaft of the driving motor 21, and the driving motor 21 drives the threaded rod 23 to rotate. Since the sliding seat 12 is screwedly connected with the threaded rod 23 through the threaded hole, the sliding seat 12 slides.

[0033] Specifically, a plurality of strip-shaped holes 34 are arranged on the fixed knife holder 30 along the length direction of the fixed knife holder 30, the length direction of the strip-shaped holes 34 is consistent with the length direction of the fixed knife holder 30, the slide rod 35 is arranged on the bottom of the moving knife holder 32 corresponding to the strip-shaped holes 34, the slide rod 35 respectively passes through the corresponding strip-shaped holes 34, the baffle 36 is arranged on the bottom of the slide rod 35, the plate surface of the baffle 36 is in sliding contact with the bottom surface of the fixed knife holder 30, so that the moving knife holder 32 can stably slide. The reciprocating assembly 40 comprises a reciprocating motor 41 vertically arranged on the sliding seat 12, the output shaft of the reciprocating motor 41 is downward and provided with a rotating disc 42, the fixed shaft 43 is vertically arranged on the bottom of the rotating disc 42 near the edge of the rotating disc 42, the vertical shaft 44 is vertically arranged on one end of the moving knife holder 32 near the sliding seat 12, the connecting plate 45 is arranged between the vertical shaft 44 and the fixed shaft 43, one end of the connecting plate 45 is rotatably connected with the vertical shaft 44, and the other end of the connecting plate 45 is rotatably connected with the fixed shaft 43, the reciprocating motor 41 drives the rotating disc 42 to rotate, so as to drive the fixed shaft 43 to rotate around the center of the rotating disc 42, and then drive the connecting plate 45 to move, so that the moving knife holder 32 reciprocates.

[0034] The use principle of the multifunctional green belt maintenance vehicle in the embodiment is as follows: when the shrubs need to be pruned, the trolley 10 is pushed to one side of the green belt, the sliding seat 12 is moved by driving the driving motor 21 to drive the threaded rod 23 to rotate, so that the fixed knife holder 30, the moving knife holder 32 and the first mounting rod 50 are all located on the shrubs, then the reciprocating motor 41 is started to drive the rotating disc 42 to rotate, so as to drive the fixed shaft 43 to rotate around the center of the rotating disc 42, and then drive the connecting plate 45 to move, so that the moving knife holder 32 reciprocates, the moving blade 33 is further pushed, and the moving blade 33 reciprocates to cooperate with the fixed blade 31 to cut off the branches or leaves; when the trolley 10 moves, the plurality of first infrared distance sensors 52 detect the distance of the objects in the moving direction of the trolley 10, when the values of some of the first infrared distance sensors 52 continuously decrease, it indicates that there is a higher tree trunk in front, when the value of the first infrared distance sensor 52 reaches a dangerous value, the driving assembly 20 drives the sliding seat 12, the fixed knife holder 30 and the moving knife holder 32 to move, until the values of all the first infrared distance sensors 52 return to normal; when the value of the second infrared sensor 53 suddenly decreases and then returns to normal, it indicates that the fixed blade 31 and the moving blade 33 pass through the tree trunk, the driving assembly 20 drives the sliding seat 12, the fixed blade 31 and the moving blade 33 to reset, so as to avoid collision with the tree trunk and ensure that the shrubs between the tree trunks can also be pruned; after one side of pruning is completed, the trolley 10 is pushed to the other side of the green belt for pruning; the worker only needs to control the trolley 10, so that the labor intensity of the worker is reduced.

[0035] The above merely is preferred implementation manner of the present application, the protection scope of the present application is not only limited to the above examples, and belongs to the technical scheme under the idea of the present application all belongs to the protection scope of the present application. It should be pointed out that, for ordinary skilled person in the art, under the premise of not departing from the principle of the present application, some improvements and decorations, these improvements and decorations should also be considered as the protection scope of the present application.

Claims

1. A multi-functional green belt maintenance vehicle comprising a cart (10), characterized in that: The trolley (10) is horizontally provided with a fixed plate (11), the fixed plate (11) is slidably provided with a sliding seat (12) along the length direction of the fixed plate (11), the fixed plate (11) is further provided with a driving assembly (20) for driving the sliding seat (12) to slide, one side of the sliding seat (12) is horizontally provided with a fixed knife holder (30), a plurality of fixed blades (31) are spaced apart along the length direction of the fixed knife holder (30), a movable knife holder (32) is slidably arranged on the top of the fixed knife holder (30) along the length direction of the fixed knife holder (30), the movable knife holder (32) is provided with a movable blade (33) corresponding to the fixed blade (31), the sliding seat (12) is provided with a reciprocating assembly (40) for driving the movable knife holder (32) to reciprocate, the sliding seat (12) is provided with a first mounting rod (50) parallel to the fixed knife holder (30), one end of the first mounting rod (50) away from the sliding seat (12) is provided with a second mounting rod (51), the length direction of the second mounting rod (51) is perpendicular to the length direction of the second mounting rod (51), a plurality of first infrared distance sensors (52) are spaced apart on the first mounting rod (50), and a second infrared sensor (53) is arranged on the second mounting rod (51).

2. The multifunctional green belt maintenance vehicle according to claim 1, characterized in that: The first mounting rod (50) away from the sliding seat (12) is flush with the outer end of the movable knife holder (32) when the movable knife holder (32) reciprocates to the farthest position, and one of the first infrared distance sensors (52) is arranged at the end of the first mounting rod (50) away from the sliding seat (12).

3. The multifunctional green belt maintenance vehicle according to claim 1, characterized in that: The second mounting rod (51) away from the first mounting rod (50) is flush with the side of the fixed knife holder (30) away from the fixed blade (31), and the second infrared sensor (53) is arranged at the end of the second mounting rod (51) away from the first mounting rod (50).

4. The multifunctional green belt maintenance vehicle according to claim 1, characterized in that: The reciprocating assembly (40) comprises a reciprocating motor (41) vertically arranged on the sliding seat (12), the output shaft of the reciprocating motor (41) is downwardly provided with a rotating disc (42), a fixed shaft (43) is vertically arranged at the bottom of the rotating disc (42) near the edge of the rotating disc (42), a vertical shaft (44) is vertically arranged at one end of the movable knife holder (32) near the sliding seat (12), a connecting plate (45) is arranged between the vertical shaft (44) and the fixed shaft (43), one end of the connecting plate (45) is rotatably connected with the vertical shaft (44), and the other end is rotatably connected with the fixed shaft (43).

5. The multi-functional green belt maintenance vehicle according to claim 1, characterized in that: A plurality of strip-shaped holes (34) are spaced apart along the length direction of the fixed knife holder (30), the length direction of the strip-shaped hole (34) is consistent with the length direction of the fixed knife holder (30), a sliding rod (35) is arranged at the bottom of the movable knife holder (32) corresponding to the strip-shaped hole (34), the sliding rod (35) respectively passes through the corresponding strip-shaped hole (34), and a baffle (36) is arranged at the bottom of the sliding rod (35).

6. The multi-functional green belt maintenance vehicle according to claim 1, characterized in that: The fixed plate (11) is spaced apart and provided with two slide rails (13), and the sliding seat (12) is slidably connected with the two slide rails (13).

7. The multi-functional green belt maintenance vehicle according to claim 1, characterized in that: The driving assembly (20) comprises a driving motor (21) arranged horizontally on one side of a fixed plate (11), the fixed plate (11) is provided with vertical plates (22) at two ends, a threaded rod (23) is rotatably arranged between the two vertical plates (22), the length direction of the threaded rod (23) is consistent with the length direction of the fixed plate (11), the sliding seat (12) is screw-connected with the threaded rod (23) through a threaded hole, and one end of the threaded rod (23) penetrates through the vertical plate (22) and is connected with the output shaft of the driving motor (21).