Earth rock excavation is the most important working condition of excavator. Crawler excavator has obvious advantages in completing this function. Because of this, crawler excavator has become a mainstream model in this kind of products. In the excavation and other operations, construction machinery always need to cooperate with the transfer of the site and the movement of the machine in place, so it must be equipped with walking device. Therefore, the function of walking is extended to slow moving in place, long-distance walking and even road driving.
In the continuous engineering practice, the wheel excavator presents some shortcomings, such as the grounding pressure problem, slip problem. With the improvement of the climbing performance of trailers, trucks and crawler excavators, crawler excavators quickly show their advantages in a period of time, and people have a more scientific and reasonable understanding of the separation of operation and driving functions.
With the acceleration of urbanization, the depth and breadth of municipal maintenance projects increase, the workload of highway traffic construction and maintenance increases, and the frequency of special operations and temporary sporadic operations such as danger elimination, emergency repair, breaking and dismantling increases. It is necessary to consider how to dispatch frequent equipment transportation. The work efficiency depends on whether the machine has enough flexibility, mobility and self-control In this case, the advantages of wheeled excavators are highlighted. The diversification of engineering projects and operation nature determines the diversification of excavator models and varieties.
Working principle of full hydraulic deflection front wheel steering system
When the engine of the wheel excavator with full hydraulic deflection front wheel steering system works, the steering pump of the full hydraulic steering system sucks oil from the mailbox, and the oil pumped out enters the steering gear through the relief valve. When the steering wheel is turned, the valve core of the steering valve in the steering gear rotates relative to the valve sleeve. The pressure oil from the steering pump enters the cycloid gear motor through the steering valve, enters the large cavity of the steering cylinder through the central rotary joint, and pushes the wheel to deflect. The oil in the small cavity of the cylinder flows back to the oil tank through the oil filter. If the steering wheel stops rotating, the valve core of the steering valve will stop rotating immediately. Due to the follow-up action of the valve, the steering valve will return to the middle position, the oil circuit of the steering cylinder will be sealed, and the oil of the steering pump will directly return to the mailbox, and the wheel will stop rotating.