The extensive use of backhoe loader not only saves manpower and material resources, but also greatly improves work efficiency. Let’s take a look at the working principle of backhoe loader:
1. The principle and realization conditions of "moving arm"
When backhoe loader are working, they usually carry out boom lifting and zipper collection at the same time. Both pumps provide oil for the boom and stick because both pumps collect on the boom and mast. If the engine is allowed to move, actions that require more oil will provide more oil. When the engine was raised, the engine was almost full. The fuel supply to the rod cylinder needs to be reduced because the boom will be lifted quickly. However, the operating mode does not always work in the "priority" state, it only needs to raise the arm quickly and the arm is in the "priority" state.
2. The hydraulic principle of "boom priority"
When the boom is raised, the pilot oil from the pilot control valve raises the boom control valve and guides the oil from the upper main pump to the larger chamber of the boom cylinder. When the pilot hydraulic pressure exceeds 2250kPa, the boom converging valve moves, and the oil from the lower main pump also leads to the large cavity of the boom cylinder. At this time, the boom cylinder is in the oil supply state of the double pumps, and the boom can move and accelerate quickly. In the control system, if the boom lift pilot oil pressure is greater than 2646, press the "single arm" button. At the same time, the lever combination is in the middle position. Therefore, even if the economy grows, the economy will grow rapidly.
3. The symptom of "boom priority" failure usually manifests as a gentler arm raising, and other movements of the machine remain normal. It can be seen that the failure of the general components of the hydraulic system does reduce the main hydraulic system of the boom cylinder, the pilot control and the electronic control of the "boom".