Control method of logistics industrial vehicle

Abstract

The invention relates to the technical field of industrial vehicles, and particularly discloses a control method of a logistics industrial vehicle, the logistics industrial vehicle comprises a chassis assembly, a portal assembly and a control assembly, the portal assembly comprises a portal located on the front side of a chassis and a fork arranged on the portal in a liftable mode; whether the pallet fork is located at a low position or not can be detected through the first inductive switch, when the pallet fork is located at the low position, the control unit controls the driving wheel set to keep a slow-speed mode with the highest speed of 6 km / h, when the pallet fork is located at the high position, whether the speed switching button is in a continuous pressing state or not is judged, if not, the control unit still controls the driving wheel set to keep the slow-speed mode, and if yes, the speed switching button is pressed continuously. The control unit controls the driving wheel set to keep the 13km / h rapid mode, the rapid mode needs to be started to meet the two conditions that the pallet fork is located at the high position and the speed switching button is continuously pressed, the vehicle can be protected, meanwhile, rapid collision caused by falling down of an operator or other misoperation is avoided, and the safety performance is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of logistics industrial vehicles, and in particular to a control method for logistics industrial vehicles. Background Art

[0002] With the rapid development of modern logistics industry, the demand for improving operation efficiency and reducing labor costs in automated warehousing and logistics centers is growing. As an important part of automated warehousing and logistics centers, the performance of logistics industrial vehicles directly affects the efficiency and safety of logistics operations. Existing logistics industrial vehicles, such as forklifts, usually require operators to manually adjust the speed of the vehicle to ensure safety when transporting goods, especially when the fork is in a lower position or the vehicle is turning. When the fork is in a low position, it is easy to rub and collide with the ground, so it is necessary to reduce the speed to avoid vehicle damage or dangerous accidents. Similarly, during the vehicle turning process, if the vehicle speed is too fast, it is easy to cause overturning and people being thrown out, so it is necessary for the operator to step on the brakes to control it.

[0003] However, there are the following risks when the operator manually controls the speed: 1. It is greatly affected by the operator's subjective consciousness. Some operators just want to go faster and still maintain a fast speed when they need to slow down. 2. For example, when the forks are in a low position, if the operator accidentally falls, the vehicle can still maintain the original speed. Since it is out of control, the speed cannot be reduced, causing greater damage. Summary of the invention

[0004] The present invention is made in consideration of the above-mentioned problems. The purpose of the invention is to provide a control method for a logistics industrial vehicle. The fast mode and slow mode of the vehicle can be switched by detecting the height of the forks and coordinating with whether the speed switch button is pressed or not. The speed can be automatically limited and safety accidents caused by operator misoperation can be avoided, and the safety performance is good.

[0005] To achieve the above-mentioned object, the present invention provides a control method for a logistics industrial vehicle, wherein the logistics industrial vehicle further comprises a chassis assembly, a front frame assembly and a control assembly, wherein the chassis assembly comprises a chassis and a driving wheel group located at the bottom of the chassis, wherein the front frame assembly comprises a front frame located at the front side of the chassis and a fork that can be raised and lowered and is arranged on the front frame, wherein the front frame is provided with a first induction switch located at a first preset height, and the fork is provided with a first induction sheet, wherein when the horizontal height of the fork is equal to or lower than the first preset height, the first induction sheet can be connected to the first induction switch, and the control assembly comprises a control unit and a speed switching button, wherein the control unit is simultaneously connected to the speed switching button, the first induction switch and the driving wheel group by electrical signals; wherein the control method comprises:

[0006] Whether the horizontal height of the fork is higher than the first preset height is determined by whether the first induction switch is connected to the first induction sheet, and the information is fed back to the control unit;

[0007] If the horizontal height of the fork is lower than or equal to the first preset height, the control unit controls the driving wheel set to be in slow mode, and limits the maximum speed of the driving wheel set to the first preset speed; if the horizontal height of the fork is higher than the first preset height, it is determined whether the speed switch button is in a continuously pressed state. If not, the control unit controls the driving wheel set to be in slow mode, and limits the maximum speed of the driving wheel set to the first preset speed. If so, the control unit controls the driving wheel set to be in fast mode, and limits the maximum speed of the driving wheel set to the second preset speed, wherein the second preset speed is greater than the first preset speed.

[0008] According to the above-mentioned control method for a logistics industrial vehicle, the first preset speed is 6 km / h, and the second preset speed is 13 km / h.

[0009] According to the above-mentioned control method for a logistics industrial vehicle, the first preset height is 50 mm.

[0010] According to the control method of a logistics industrial vehicle described above, the frame assembly also includes a hydraulic power unit for driving the fork to perform lifting and lowering movements, the front frame is provided with a limit sensor switch, and the fork is also provided with a second sensor sheet; the control method also includes:

[0011] When the hydraulic power unit drives the fork to be in the lifting state, if the second sensor plate contacts the limit sensor switch, the limit sensor switch feeds back the signal to the control unit, and the control unit controls the hydraulic power unit to cut off the power to limit the fork from continuing to rise.

[0012] According to the above-mentioned control method for a logistics industrial vehicle, the control component further includes a lifting button and a lowering button, and the lifting button and the lowering button are both connected to the hydraulic power unit with an electrical signal.

[0013] According to the above-mentioned control method for a logistics industrial vehicle, the driving wheel group includes a driving wheel rotatably connected to the bottom of the chassis and two driven wheels respectively located at the front ends of two forks, and the control unit is connected to the driving wheel by electrical signals.

[0014] According to the above-mentioned control method of a logistics industrial vehicle, the logistics industrial vehicle also includes a steering assembly, the frame assembly includes a rear frame located on the rear side of the chassis, the steering assembly includes a steering handle, a steering shaft, a steering plate and a connecting plate, the steering shaft is rotatably fixed on the rear frame, the steering handle is connected to the upper end of the steering shaft, the steering plate is connected to the lower end of the steering shaft, and the connecting plate is used to connect the steering plate and the driving wheel.

[0015] According to the control method of a logistics industrial vehicle described above, the steering assembly also includes a sensor, the sensor is fixed on the rear frame and is electrically connected to the control unit, and one end of the sensor is located on one side of the steering plate, and the steering plate is provided with a first speed limiter and a second speed limiter arranged at intervals, when the steering plate is rotated clockwise or counterclockwise by a first preset angle, the first limiter and the second limiter can abut against the sensor; the control method also includes:

[0016] When the first limit portion or the second limit portion is connected to the sensor, the sensor feeds back a signal to the control unit, and the control unit controls the driving wheel to be in a low-speed mode and limits the maximum speed of the driving wheel to 5 km / h.

[0017] According to the above-mentioned control method for a logistics industrial vehicle, the steering handle includes a handle rudder, a handle rod and a handle seat, the handle rudder is fixed to the upper end of the handle rod, the lower end of the handle rod is welded to the handle seat, and the handle seat is sleeved on the outer side of the upper end of the steering shaft and is detachably connected to the steering shaft through a flat key.

[0018] According to the above-mentioned control method of a logistics industrial vehicle, the steering assembly also includes a mounting seat and a swivel seat, the mounting seat is fixed to the bottom of the chassis, the driving wheel is rotatably connected to the mounting seat through the swivel seat, one end of the connecting plate is connected to the steering plate, and the other end of the connecting plate is connected to the swivel seat.

[0019] The present invention has the following beneficial effects:

[0020] 1. The first induction switch can detect whether the fork is in the low position. When it is in the low position, the control unit controls the driving wheel set to maintain a slow speed mode with a maximum speed of 6 km / h. When the fork is in the high position, it determines whether the speed switch button is in a continuously pressed state. If not, the control unit still controls the driving wheel set to maintain a slow speed mode. If so, the control unit controls the driving wheel set to maintain a fast speed mode of 13 km / h. The activation of the fast mode requires the fork to be in the high position and the speed switch button to be continuously pressed. This can protect the vehicle and avoid rapid collisions caused by the operator falling or other misoperations, further improving safety performance.

[0021] 2. A limit sensing switch is also provided on the front frame. When the hydraulic power unit drives the fork to lift and the second sensing plate of the fork is connected to the limit sensing switch, the control unit can control the hydraulic power unit to cut off the power to prevent the lifting hydraulic power unit from continuously working in an overflow state, thereby avoiding the consumption of electrical energy caused by noise.

[0022] 3. During the turning process of the vehicle, when its rotation exceeds the preset angle, the first limit part or the second speed limit part on the steering plate will connect with the sensor, and the control unit can control the driving wheel group to be in low-speed mode and travel at a maximum speed limit of 5km / h. The speed of the vehicle during the turn can be forcibly reduced to reduce the probability of safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure at point A;

[0025] Figure 3 is a side view of the overall structure of this embodiment;

[0026] Figure 4 This is a rear view of the front frame and forks of this embodiment;

[0027] Figure 5 is an overall cross-sectional view of the steering assembly of this embodiment;

[0028] Figure 6 It is an assembly diagram of the steering plate and the sensor of this embodiment.

[0029] In the figure:

[0030] 100, chassis assembly; 110, chassis; 120, driving wheel assembly; 121, driving wheel; 122, driven wheel;

[0031] 200, frame assembly; 210, front frame; 211, first induction switch; 212, limit induction switch; 220, fork; 221, first induction sheet; 222, second induction sheet; 230, rear frame;

[0032] 300, control component; 310, speed switching button; 320, lifting button; 330, lowering button;

[0033] 400, steering assembly; 410, steering handle; 411, handle rudder; 412, handle rod; 413, handle seat; 413a, flat key; 420, steering shaft; 430, steering plate; 431, first limit part; 432, second limit part; 440, connecting plate; 450, sensor; 460, mounting seat; 470, swivel seat. DETAILED DESCRIPTION

[0034] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0035] like Figure 1-6 As shown, a logistics industrial vehicle includes a chassis assembly 100 , a frame assembly 200 , a control assembly 300 and a steering assembly 400 .

[0036] Among them, the chassis assembly 100 includes a chassis 110 and a driving wheel group 120 located at the bottom of the chassis 110, the front frame 210 assembly includes a front frame 210 located at the front side of the chassis 110 and a fork 220 that can be raised and lowered and is arranged on the front frame 210, the front frame 210 is provided with a first sensing switch 211 located at a first preset height, and the fork 220 is provided with a first sensing sheet 221. When the horizontal height of the fork 220 is equal to or lower than the first preset height, the first sensing sheet 221 can be connected to the first sensing switch 211. The control assembly 300 includes a control unit and a speed switching button 310. The control unit is also electrically connected to the speed switching button 310, the first sensing switch 211 and the driving wheel group 120.

[0037] A control method for a logistics industrial vehicle comprises:

[0038] Firstly, whether the horizontal height of the fork 220 is higher than the first preset height is determined by whether the first sensing switch 211 is connected to the first sensing sheet 221, and the information is fed back to the control unit. In the present embodiment, the height of the fork 220 higher than the first preset height is defined as a high position, and the height of the fork 220 lower than or equal to the first preset height is defined as a low position. When the first sensing sheet 221 is connected to the first sensing switch 211, it is proved that the fork 220 has dropped to the low position. At this time, the first sensing switch 211 sends a signal to feed back to the control unit, and the control unit receives the position signal of the fork 220 being in the low position. If the first sensing sheet 221 is separated from the first sensing switch 211, the fork 220 is in the high position. At this time, the control unit determines that the fork 220 is in the high position and performs the next step of judgment.

[0039] Secondly, if the horizontal height of the fork 220 is lower than or equal to the first preset height, that is, when it is in the low position, the control unit controls the driving wheel group 120 to be in the slow mode, and limits the maximum speed of the driving wheel group 120 to the first preset speed, that is, when the fork 220 is in the low position, regardless of whether the speed switching button 310 is pressed, the driving wheel group 120 can only maintain the slow mode to avoid high-speed friction and collision between the fork 220 and the ground due to excessive speed, thereby avoiding damage to the vehicle due to high-speed collision and the resulting safety accidents; if the horizontal height of the fork 220 is higher than the first preset height, it is determined whether the speed switching button 310 is in a continuously pressed state. If not, the control unit controls the driving wheel group 120 to be in the slow mode, and limits the maximum speed of the driving wheel group 120 to the first preset speed. If so, the control unit controls The driving wheel assembly 120 is controlled to be in the fast mode, and the maximum speed of the driving wheel assembly 120 is limited to the second preset speed. Even if the fork 220 is in a high position, the driving wheel assembly 120 still cannot adopt the fast mode. Only when the operator presses the speed switching button 310 synchronously can it be switched to the fast mode, and its maximum speed is improved. Therefore, it can avoid safety accidents caused by the operator's misoperation when the fork 220 is in a high position. For example, when the fork 220 is in a high position, if the operator keeps stepping on the accelerator, but because the vehicle shakes, the operator's hands are separated from the control device, and when they are also separated from the speed switching button 310, the control unit automatically controls the driving wheel assembly 120 to enter the slow mode to avoid high-speed collision, wherein the speed of the driving wheel assembly 120 is consistent with the driving speed of the vehicle, and the second preset speed is greater than the first preset speed.

[0040] Specifically, the first preset speed is 6 km / h, and the second preset speed is 13 km / h. When the second preset speed is adopted, it is suitable for longer distance transportation, and when the first preset speed is adopted, it is suitable for short distance driving before forking the goods. The first preset height is 50 mm. When the fork 220 is lower than this height, the driving wheel group 120 is controlled to keep the vehicle in a slow driving state.

[0041] In order to avoid continuous noise caused by the upper limit position, the frame assembly 200 also includes a hydraulic power unit for driving the fork 220 to perform lifting and lowering movements. A limit sensing switch 212 is provided on the front frame 210, and the limit sensing switch 212 is electrically connected to the control unit. A second sensing plate 222 is provided on the fork 220. When the hydraulic power unit drives the fork 220 to be in a lifting state, if the second sensing plate 222 contacts the limit sensing switch 212, it proves that the fork 220 has risen to the upper limit position. The limit sensing switch 212 feeds back a signal to the control unit, and the control unit controls the hydraulic power unit to cut off power to limit the fork 220 from continuing to rise, thereby avoiding the lifting hydraulic power unit from being in a continuous overflow state, thereby avoiding the generation of noise and energy consumption.

[0042] In this embodiment, the horizontal height of the second sensing sheet 222 is lower than the horizontal height of the first sensing sheet 221 and also lower than the height of the limit sensing switch 212, while the lowest horizontal height of the first sensing sheet 221 is higher than the height of the limit sensing switch 212 to avoid accidental touch.

[0043] In order to control the lifting of the fork 220, the control component 300 also includes a lifting button 320 and a lowering button 330. The lifting button 320 and the lowering button 330 are both connected to the electrical signal of the hydraulic power unit, which controls the lifting or lowering of the fork 220 through the control unit. When the fork 220 rises to the limit position and cuts off the power of the hydraulic power unit, even if the lifting button 320 is pressed, the power cannot be output any more.

[0044] Specifically, the driving wheel group 120 includes a driving wheel 121 rotatably connected to the bottom of the chassis 110 and two driven wheels 122 respectively located at the front ends of the two forks 220. The control unit is electrically connected to the driving wheel 121. The two driven wheels 122 are universal wheels. The driving wheel 121 has its own driving motor, and the driving speed of the driving wheel 121 is controlled by applying a signal to the driving motor.

[0045] Specifically, the frame assembly 200 includes a rear frame 230 located on the rear side of the chassis 110, and the steering assembly 400 includes a steering handle 410, a steering shaft 420, a steering plate 430 and a connecting plate 440. The steering shaft 420 is rotatably fixed on the rear frame 230, the steering handle 410 is connected to the upper end of the steering shaft 420, the steering plate 430 is connected to the lower end of the steering shaft 420, and the connecting plate 440 is used to connect the steering plate 430 and the driving wheel 121. The steering handle 410 can drive the steering shaft 420 to rotate, the steering shaft 420 drives the steering plate 430 to rotate, and then drives the connecting plate 440 to rotate, and drives the driving wheel 121 to rotate through the connecting plate 440, thereby realizing the steering of the entire vehicle.

[0046] In order to improve the safety performance during steering, the steering assembly 400 also includes a sensor 450, which is fixed on the rear frame 230 and electrically connected to the control unit. One end of the sensor 450 is located on one side of the steering plate 430. The steering plate 430 is provided with a first speed limiter and a second speed limiter arranged at intervals. When the steering plate 430 rotates clockwise or counterclockwise by a first preset angle, the first limiter and the second limiter can abut against the sensor 450. When the first limiter or the second limiter is in contact with the sensor 450, the sensor 450 feeds back a signal to the control unit. The control unit controls the drive wheel 121 to be in low speed mode and limits the maximum speed of the drive wheel 121 to 5 km / h. The vehicle speed is further reduced during the steering process, which can improve the safety performance of the operation and avoid people being thrown away or collisions caused by high speed. At the same time, the steering needs to exceed the first preset angle before the speed limit is implemented, avoiding speed limit due to a slight deviation in direction, thereby improving the stability of the movement.

[0047] Specifically, the steering handle 410 includes a handle rudder 411, a handle rod 412 and a handle seat 413. The handle rudder 411 is fixed to the upper end of the handle rod 412, and the lower end of the handle rod 412 is welded to the handle seat 413. The handle seat 413 is sleeved on the outer side of the upper end of the steering shaft 420, and is detachably connected to the steering shaft 420 through a flat key 413a. The handle rudder 411 drives the handle rod 412 to rotate, and drives the steering shaft 420 to rotate through the handle seat 413. The use of the flat key 413a to connect can ensure the detachability of the handle seat 413 and the steering shaft 420, and at the same time can drive the steering shaft 420 to rotate.

[0048] In order to realize the rotatable installation of the driving wheel 121, the steering assembly 400 also includes a mounting seat 460 and a swivel seat 470. The mounting seat 460 is fixed to the bottom of the chassis 110, and the driving wheel 121 is rotatably connected to the mounting seat 460 through the swivel seat 470. One end of the connecting plate 440 is connected to the steering plate 430, and the other end of the connecting plate 440 is connected to the swivel seat 470. The swivel seat 470 is rotatably connected to the mounting seat 460, and the driving wheel 121 is fixed to the bottom of the swivel seat 470. Therefore, the connecting plate 440 only needs to drive the swivel seat 470 to realize the steering of the driving wheel 121. In this embodiment, both ends of the connecting plate 440 are detachably connected to other components by bolts, which is conducive to overall assembly and disassembly and maintenance.

[0049] The technical solution of the present invention is described in detail above in conjunction with the accompanying drawings, and the described embodiments are used to help understand the concept of the present invention. The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art of the invention may make various modifications or supplements to the described specific embodiments or replace them in a similar manner, but they will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims.

[0050] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0051] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A control method for a logistics industrial vehicle, characterized in that: The logistics industrial vehicle further comprises a chassis assembly, a frame assembly and a control assembly, wherein the chassis assembly comprises a chassis and a driving wheel assembly located at the bottom of the chassis, the frame assembly comprises a front frame located at the front side of the chassis and a liftable fork disposed on the front frame, the front frame is provided with a first induction switch located at a first preset height, the fork is provided with a first induction sheet, when the horizontal height of the fork is equal to or lower than the first preset height, the first induction sheet can be connected to the first induction switch, the control assembly comprises a control unit and a speed switching button, and the control unit is simultaneously connected to the speed switching button, the first induction switch and the driving wheel assembly by electrical signals; the control method comprises; Whether the horizontal height of the fork is higher than the first preset height is determined by whether the first induction switch is connected to the first induction sheet, and the information is fed back to the control unit; If the horizontal height of the fork is lower than or equal to the first preset height, the control unit controls the driving wheel set to be in slow mode, and limits the maximum speed of the driving wheel set to the first preset speed; if the horizontal height of the fork is higher than the first preset height, it is determined whether the speed switch button is in a continuously pressed state. If not, the control unit controls the driving wheel set to be in slow mode, and limits the maximum speed of the driving wheel set to the first preset speed. If so, the control unit controls the driving wheel set to be in fast mode, and limits the maximum speed of the driving wheel set to the second preset speed, wherein the second preset speed is greater than the first preset speed.

2. A control method for a logistics industrial vehicle according to claim 1, characterized in that: The first preset speed is 6 km / h, and the second preset speed is 13 km / h.

3. A control method for a logistics industrial vehicle according to claim 1, characterized in that: The first preset height is 50 mm.

4. A control method for a logistics industrial vehicle according to claim 1, characterized in that: The frame assembly further includes a hydraulic power unit for driving the fork to perform lifting motion, a limit sensing switch is provided on the front frame, and a second sensing sheet is provided on the fork; the control method further includes: When the hydraulic power unit drives the fork to be in the lifting state, if the second sensor plate contacts the limit sensor switch, the limit sensor switch feeds back the signal to the control unit, and the control unit controls the hydraulic power unit to cut off the power to limit the fork from continuing to rise.

5. A control method for a logistics industrial vehicle according to claim 4, characterized in that: The control component also includes a lifting button and a lowering button, and both the lifting button and the lowering button are connected to the hydraulic power unit by electrical signals.

6. A control method for a logistics industrial vehicle according to claim 1, characterized in that: The driving wheel group includes a driving wheel rotatably connected to the bottom of the chassis and two driven wheels respectively located at the front ends of two forks, and the control unit is connected to the driving wheel by electrical signals.

7. A method for controlling a logistics industrial vehicle according to claim 6, characterized in that: The logistics industrial vehicle also includes a steering assembly, and the frame assembly also includes a rear frame located on the rear side of the chassis. The steering assembly includes a steering handle, a steering shaft, a steering plate and a connecting plate. The steering shaft is rotatably fixed on the rear frame, the steering handle is connected to the upper end of the steering shaft, the steering plate is connected to the lower end of the steering shaft, and the connecting plate is used to connect the steering plate and the driving wheel.

8. A method for controlling a logistics industrial vehicle according to claim 7, characterized in that: The steering assembly further includes a sensor, which is fixed on the rear frame and electrically connected to the control unit, and one end of the sensor is located at one side of the steering plate, and the steering plate is provided with a first speed limiting portion and a second speed limiting portion arranged at intervals, and when the steering plate is rotated clockwise or counterclockwise by a first preset angle, the first limiting portion and the second limiting portion can abut against the sensor; The control method further comprises: When the first limit portion or the second limit portion is connected to the sensor, the sensor feeds back a signal to the control unit, and the control unit controls the driving wheel to be in a low-speed mode and limits the maximum speed of the driving wheel to 5 km / h.

9. A method for controlling a logistics industrial vehicle according to claim 7, characterized in that: The steering handle includes a handle rudder, a handle rod and a handle seat. The handle rudder is fixed to the upper end of the handle rod, the lower end of the handle rod is welded to the handle seat, and the handle seat is sleeved on the outer side of the upper end of the steering shaft and is detachably connected to the steering shaft via a flat key.

10. A method for controlling a logistics industrial vehicle according to claim 7, characterized in that: The steering assembly also includes a mounting seat and a swivel seat, the mounting seat is fixed to the bottom of the chassis, the driving wheel is rotatably connected to the mounting seat through the swivel seat, one end of the connecting plate is connected to the steering plate, and the other end of the connecting plate is connected to the swivel seat.

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