CN103158480A - High ground clearance self-propelled type base plate with adjustable gap from ground - Google Patents

Abstract

A high ground clearance self-propelled chassis with adjustable ground clearance, comprising: a cab, a liftable ladder, a vehicle frame, front and rear axles, a ground clearance adjustment system, and a power system; the ground clearance adjustment system further includes: a controller, Servo valve, ground clearance adjustment hydraulic cylinder; power system includes: engine, clutch, pump station, hydraulic motor, proportional valve, front and rear wheels. In the present invention, the controller controls the servo valve to adjust the synchronous lifting of the four ground clearance adjustment hydraulic cylinders to smoothly change the ground clearance of the chassis; the engine is connected to the pump station through the clutch, and the pump station drives the hydraulic motor to drive the front and rear wheels to rotate, and the hydraulic steering The controller controls the opening of the proportional valve to adjust the displacement of the hydraulic motor to adjust the speed of the four wheels and realize the four-wheel differential steering. The invention ensures the passability of the chassis, makes the high ground clearance walking chassis suitable for operations with different ground clearance requirements, avoids the complicated mechanical transmission mechanism designed to ensure the ground clearance, and effectively reduces the weight of the chassis.

Description

A high ground clearance self-propelled chassis with adjustable ground clearance

Technical field:

The invention relates to a high ground clearance self-propelled chassis with adjustable ground clearance, in particular to a hydraulically driven self-propelled chassis whose ground clearance is adjusted through a hydraulic cylinder.

technical background:

In order to meet the field management requirements of high-stalk crops in farmland, a high-ground-clearance walking chassis is often required. However, the existing high-ground-clearance walking chassis often have a fixed ground clearance and are only suitable for field management operations of crops of a specific height. Therefore, in order to apply to different crop heights It is of great significance to develop a high-ground-clearance walking chassis with adjustable ground-clearance to meet the requirements of various ground-clearance field operations.

Due to the different sizes and shapes of farmland, it is required that the walking chassis of the working tools have good steering performance. The existing steering system drives the steering rod to move in a certain way to drive the wheels to turn, which will make the driver need to provide a lot of torque when operating the steering wheel to control the steering of the car; and for more convenient driving, an assistant steering is often added Therefore, a convenient and simple steering system is of great significance to the walking chassis of field work.

In the prior art, the applicant has not found a high ground clearance self-propelled chassis with adjustable ground clearance. Retrieval of related patents found that the application date is 2210.9.16, and the application publication number is CN102146756A Chinese patent "High clearance self-propelled boom sprayer". The invention adopts four-wheel hydraulic drive, and a hydraulic steering device is arranged in the middle of the front and rear axles. This hydraulic steering device can only realize two-wheel steering, and the steering radius is large. Although the ground clearance of the spray boom can be adjusted by the lifting motor, the ground clearance of the walking chassis actually depends on the diameter of the tire, which makes the spray boom suitable for a variety of field work requirements for ground clearance, but the passage of the walking chassis cannot be guaranteed. Therefore, the whole machine cannot be applied to the field operation requirements of various ground clearances.

The application date is 2011.05.30, and the application publication number is CN201120177606.4 for the Chinese patent "A Four-Wheel Steering Vehicle". The invention controls the booster pump through the steering wheel, and the booster pump outputs and recovers hydraulic oil to four hydraulic cylinders. The piston in the hydraulic cylinder moves under the action of the hydraulic oil and drives the steering rod, which in turn drives the wheels to turn. Although this invention can realize four-wheel steering, multiple hydraulic circuits are required, and the design is complicated.

Invention content:

The purpose of the present invention is to design a high ground clearance self-propelled chassis with adjustable ground clearance in order to meet the field operation requirements of various ground clearances.

In order to achieve the above object, the technical solution adopted by the present invention is: a high ground clearance self-propelled chassis with adjustable ground clearance, including vehicle frame, front axle, rear axle, driver's cab, liftable ladder, lift hydraulic cylinder, power system , Gap adjustment system.

The power system includes: engine, clutch, pump station, hydraulic steering gear, hydraulic motor, proportional valve, and wheels.

The cab is connected to the frame, the engine and the pump station are connected to the frame by bolts, the engine is connected to the pump station through the clutch, and the pump station drives four wheels to rotate by driving four hydraulic motors. The four proportional valves are respectively connected to the four hydraulic motors through bolts, the hydraulic motors are respectively hinged to the connecting blocks, and the connecting blocks are respectively connected to the vertical shaft of the front axle and the vertical shaft of the rear axle through bolts. The hydraulic steering gear is connected to the steering wheel, and by turning the steering wheel to adjust the hydraulic steering gear to control the openings of the four proportional valves, thereby adjusting the displacement of the four hydraulic motors to adjust the speed of the four wheels to achieve four-wheel differential steering.

The front axle includes: left and right swing arms, a front axle vertical shaft, a middle connection block of the front axle, left and right anti-collision blocks of the front axle, and shock absorbing springs of the front axle. The left and right swing arms are connected to the middle connecting block of the front axle by hinges, the shock absorbing springs of the front axle are set on the left and right anti-collision blocks of the front axle, and the left and right anti-collision blocks of the front axle are respectively connected to the left and right swing arms by welding . The front axle is hinged on the vehicle frame through the middle connecting block of the front axle. The left and right swing arms can rotate around the middle connecting block, so that the left wheel of the front axle connected to the front axle and the right wheel of the front axle jump independently, thereby reducing the vibration of the vehicle body.

The rear axle includes: rear axle intermediate shaft, rear axle vertical shaft, rear axle connecting block, rear axle damping spring steel plate. The connecting block of the rear axle is welded to the intermediate shaft. The rear axle is hinged on the vehicle frame through the rear axle connecting block. The shock-absorbing spring steel plate is connected on the rear axle connection block and the vehicle frame by bolts.

The liftable ladder is hinged on the vehicle frame, and the lift hydraulic cylinder is respectively connected to the liftable ladder and the front axle through the hinge.

The ground clearance adjustment system consists of a controller, a servo valve, and four ground clearance adjustment hydraulic cylinders. One end of the four ground clearance adjusting hydraulic cylinders is respectively connected to the vertical shaft of the front axle and the vertical shaft of the rear axle through a threaded sleeve. The other end is welded to the left and right swing arms of the front axle and the intermediate shaft of the rear axle respectively; when the chassis needs to change the ground clearance operation, the controller can control the servo valve to adjust the synchronization of the four ground clearance adjustment hydraulic cylinders Lift and lower to change the chassis ground clearance.

The present invention has the following technical beneficial effects:

The invention can control the servo valve by the controller to adjust the synchronous lifting of the four ground clearance adjusting hydraulic cylinders to smoothly change the ground clearance of the chassis and ensure the passability of the chassis, thus being applicable to field operation requirements of various ground clearances.

The invention adjusts the hydraulic steering gear by turning the steering wheel to control the opening of the proportional valve, thereby adjusting the displacement of the hydraulic motor to change the rotation speed of the four wheels and realize the four-wheel differential steering, effectively reducing the turning radius and making the steering more stable.

The invention improves the ground clearance through the front and rear axles, adopts four-wheel hydraulic drive, avoids the complicated mechanical transmission mechanism designed to ensure the ground clearance, and effectively reduces the self-weight of the chassis.

The front axle can make the left and right wheels jump independently through the left and right swing arms, and the shock absorbing spring of the front axle and the shock absorbing spring steel plate of the rear axle can reduce the vibration and impact of the vehicle body caused by ground excitation, thereby improving the running of the walking chassis stability and driving comfort.

Description of drawings:

Fig. 1 is an axonometric view of the present invention

Fig. 2 is the top view of the present invention

Figure 3 is the front view of the front axle

Figure 4 is the axonometric view of Figure 3

Figure 5 is the axonometric view of the rear axle

Figure 6 is a flow chart of the power system

In the figure, 1—frame, 2—cab, 3—handrail, 4—lift hydraulic cylinder, 5—lift ladder, 6—front axle, 7—wheel, 7a—left wheel of front axle, 7b—right wheel of front axle , 7c—rear axle left wheel, 7d—rear axle right wheel, 8—front axle damping spring, 9—rear axle, 10—rear axle damping spring steel plate, 11—steering wheel, 12—hydraulic steering gear, 13—pump Station, 14—hydraulic oil tank, 15—clutch, 16—engine, 17—controller, 18—servo valve, 19—left swing arm, 20—middle connecting block of front axle, 21—right swing arm, 22—front axle Left and right anti-collision blocks, 23—ground clearance adjustment hydraulic cylinder, 24—threaded sleeve, 25—vertical shaft of front axle, 26—connecting block, 27—proportional valve, 28—hydraulic motor, 29—lifting hydraulic cylinder hinge Block, 30—rear axle connection block, 31—rear axle intermediate shaft, 32—rear axle vertical shaft

Detailed ways:

The present invention will be further described below in conjunction with the accompanying drawings.

The driver's cab 2 is connected to the vehicle frame 1, the front axle 6 is hinged on the vehicle frame 1 through the front axle intermediate connecting block 20, and the rear axle 9 is hinged on the vehicle frame 1 through the rear axle connecting block 30.

The liftable ladder 5 realizes the lifting of the ladder 5 through the movement of the lifting hydraulic cylinder 4. The liftable ladder 5 is connected to the vehicle frame 1 through a hinge, and the liftable hydraulic cylinder 4 is hinged to connect the liftable ladder 5 and the front axle 6. The handrail 3 ensures that the driver can go up and down. car safety.

The pumping station 13, the engine 16 is connected to the vehicle frame 1 through bolts, and the engine 16 is connected to the pumping station 13 through the clutch 15.

The left swing arm 19 and the right swing arm 21 are hingedly connected to the middle connecting block 20 of the front axle, and the left and right swing arms 19, 21 of the front axle can rotate around the middle connecting block 20, so that the left wheel 7a of the front axle and the right wheel 7b of the front axle are separated Jump, the front axle damping spring 8 connects vehicle frame 1 and front axle 6, and the left and right anti-collision blocks of the front axle are respectively connected on the left swing arm and the right swing arm by welding. Rear axle damping spring steel plate 10 is connected on the rear axle connecting block and vehicle frame by bolts. The independent beating of the left wheel of the front axle and the right wheel of the front axle, as well as the vibration damping spring 8 of the front axle and the damping spring steel plate 10 of the rear axle can reduce the vibration and impact of the vehicle body due to ground excitation, and improve the driving stability and stability of the walking chassis. driving comfort.

One ends of the four ground clearance adjustment hydraulic cylinders 23 are respectively connected to the front axle vertical shaft 25 and the rear axle vertical shaft 32 through threaded sleeves 24, and the other ends of the four ground clearance adjustment hydraulic cylinders are welded to the left swing arm 19 and the right swing arm respectively. arm 21 and rear axle intermediate shaft 31 . When the walking chassis needs to work at different ground clearances, the controller 17 can control the servo valve 18 to adjust the four ground clearance adjustment hydraulic cylinders 23 to rise and fall synchronously to change the chassis ground clearance.

The four hydraulic motors 28 are respectively hinged to the connecting block 26, the connecting block 26 is connected to the front axle vertical shaft 25 and the rear axle vertical shaft 32 by bolts, and the four proportional valves 27 are respectively connected to the four hydraulic motors 28 by bolts.

The pump station 13 drives the hydraulic motor 28 to drive the front and rear wheels to rotate. By turning the steering wheel 11 and the hydraulic steering gear 12 to control the opening of the proportional valve 27, the displacement of the hydraulic motor 28 is adjusted to change the rotation speed of the four wheels and realize the four-wheel differential steering. Such as turning left, turn the steering wheel 11 to adjust the hydraulic steering gear 12, increase (decrease) the opening of the proportional valve 27 on the front axle right wheel 7b (left wheel 7a) and the rear axle right wheel 7d (left wheel 7c), thereby increasing Increase (reduce) the displacement of the motor, so that the rotation speed of the wheels 7b and 7d is greater than that of the wheels 7a, 7b, and realize differential steering, which effectively reduces the turning radius and turns more smoothly.

Claims (3)

1. A high ground clearance self-propelled chassis with adjustable ground clearance, including vehicle frame, front axle, rear axle, driver's cab, liftable ladder, lifting hydraulic cylinder, power system; power system includes: engine, clutch, Pumping station, hydraulic steering gear, hydraulic motor, proportional valve, traveling wheel; the cab is connected to the frame, the engine, and the pumping station are connected to the frame through bolts, the engine is connected to the pumping station through a clutch, and the pumping station drives four hydraulic motors In order to drive the four traveling wheels to rotate, the four proportional valves are respectively connected to the four hydraulic motors through bolts, and the hydraulic motors are respectively hinged to the connecting blocks, and the connecting blocks are connected to the vertical shaft of the front axle and the vertical shaft of the rear axle through bolts; The front axle includes: the left and right swing arms, the vertical shaft of the front axle, the middle connecting block of the front axle, the left and right anti-collision blocks of the front axle, the shock absorbing spring of the front axle; On the collision block, the left and right anti-collision blocks of the front axle are respectively connected to the left swing arm and the right swing arm by welding, and the front axle is hinged to the vehicle frame through the middle connecting block of the front axle; The rear axle includes: rear axle intermediate shaft, rear axle vertical shaft, rear axle connecting block, rear axle damping spring steel plate; The spring steel plate is connected to the rear axle connecting block and the vehicle frame through bolts, the liftable ladder is connected to the vehicle frame through a hinge, and the lift hydraulic cylinder is respectively connected to the liftable ladder and the front axle through a hinge; It is characterized in that it also includes a ground clearance adjustment system, which is composed of a controller, a servo valve, and four ground clearance adjustment hydraulic cylinders; one end of the four ground clearance adjustment hydraulic cylinders is respectively connected to the vertical shaft of the front axle through a threaded sleeve. , the vertical shaft of the rear axle, and the other end is welded to the left swing arm, right swing arm, and the intermediate shaft of the rear axle; when the chassis needs to change the ground clearance operation, the four ground clearance adjustment hydraulic cylinders can be adjusted by controlling the servo valve through the controller The synchronous lifting of the chassis changes the ground clearance of the chassis. 2. A self-propelled chassis with adjustable ground clearance as claimed in claim 1, characterized in that: the hydraulic steering gear is connected to the steering wheel, and the hydraulic steering gear is adjusted by turning the steering wheel to control the openings of the four proportional valves, thereby Adjust the displacement of the four hydraulic motors to change the speed of the four road wheels to achieve four-wheel differential steering. 3. A self-propelled chassis with adjustable ground clearance as claimed in claim 1 or 2, characterized in that: the left swing arm and the right swing arm are hingedly connected to the middle connecting block of the front axle, and the left swing arm, The right swing arm can rotate around the middle connecting block, so that the front axle can be connected to the left wheel of the front axle, and the right wheel of the front axle can jump independently, thereby reducing the vibration of the vehicle body.

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