The key point: the steering control system of the tire hydraulic excavator is introduced: the crawler type hydraulic excavator is to control the oil supply mode of the walking motor through the control valve, and the tire hydraulic excavator has its own special steering mechanism.
The crawler hydraulic excavator is used to control the oil supply mode of the walking motor through the control valve, while the tire hydraulic excavator has its own special steering mechanism.
Basic requirements for the steering mechanism
The basic requirements for the steering mechanism of the tire type hydraulic excavator are:
1) because the working condition of the excavator is very poor, it often runs on the rough and uneven land, so the strength and service life of the parts of the steering mechanism are higher, so as to ensure the safety and reliability of the steering mechanism.
2) because of frequent steering operations, excavators should be manipulated to lighten the driver's labor intensity so as to improve the efficiency of the excavator.
3) in order to feed the driving resistance of the excavator, ensure the accuracy of the driving direction and movement track, and reduce the tire wear, the wheel should be pure rolling, and the wheel is not swinging in the horizontal plane.
4) the reverse efficiency of the steering mechanism should be low, so as to reduce the response of the wheel to the steering wheel.
5) the steering mechanism should be easy to maintain, and the adjustment parts are few and simple.
6) to ensure that the upper turntable of the excavator is 360 degrees above the chassis.
Steering mode of tyre hydraulic excavator
The steering mode of the tire type hydraulic excavator is as follows:
1) according to the whole steering mode, deflection wheel steering and folding steering.
2) according to the transmission mode of the steering mechanism, there are mechanical steering, hydraulic power steering, hydraulic steering and pneumatic power steering.
3) according to the steering wheel position, there are front wheel steering, rear wheel steering and full steering.
Steering principle
At present, the wheel type hydraulic excavator widely adopts the deflection front wheel hydraulic steering mode, and uses feedback machinery to solve the interlocking between the steering wheel and the steering wheel.
The hydraulic steering wheel of the tire hydraulic excavator is controlled by the steering gear. The pressure oil output by the oil pump enters the steering oil cylinder through the central rotary joint and drives the left steering arm to rotate around the main pin of the steering knuckle. The steering knuckle arm is driven by the steering tie bar to deflect both sides of the steering wheel at the same time, thereby achieving the steering. The steering gear is controlled by the driver steering the steering wheel.
The steering knuckle arm has several ways, such as hydraulic drive, hydraulic boosting, pneumatic boosting and hydrostatic drive, but hydraulic propulsion is most common.
