1. install position sensor
According to the analysis in the previous chapter, a control method is proposed here, which is for reference only: firstly, the external circle of the excavator's slewing bearing is taken as the track, and a position sensor is installed between the upper platform and the chassis walking frame. The inductive proximity switch and positioning device can be used together. When the excavator turns to the angle range set at the rear, the position sensor outputs the control signal. Considering the actual working condition of wheel excavator, it is suggested that the angle range should be controlled within 120 °.
2. in the hydraulic steering system, a two position four-way solenoid change-over valve is added, which is connected after the steering gear. When there is no control signal, the reversing valve is in the left position and the oil circuit to the steering hydraulic cylinder has not changed. When the excavator turns to the angle range set behind the machine, the solenoid change-over valve obtains the control signal of position sensor, then the change-over valve is switched to the right position, and the oil circuit of the steering hydraulic cylinder is changed to keep the driving direction of the machine consistent with the direction of steering wheel rotation. When the upper mechanism of the machine turns away from the specified angle range, the control signal of the reversing valve is cut off, and the steering control of the whole machine is restored to the original state.