An Excavator Oil Return Pressure Control Circuit

Abstract

The invention discloses an excavator return oil pressure control loop and belongs to the technical field of engineering machinery return oil pressure control. The excavator return oil pressure control loop comprises a hydraulic oil tank (5), a radiator (7), a counterbalance valve (8), a rotary motor (9), an electronic control loop and a hydraulic control loop. The electronic control loop comprises a pressure switch (1), a controller (2) and an electromagnetic directional valve (3). The hydraulic control loop comprises a bypass valve (4) and a return oil filter (6). The pressure switch, the controller and the electromagnetic directional valve are connected in series, the electromagnetic directional valve and the bypass valve are connected in parallel through a hydraulic pipe, and a parallel connection loop formed by the electromagnetic directional valve and the bypass valve is in parallel connection with a system return oil pipe and is connected with the hydraulic oil tank through the return oil filter. Compared with the prior art, the excavator return oil pressure control loop enables return oil pressure to be controlled within safety range values, controls system return oil pressure values accurately, effectively protects normal operation of a hydraulic system, prolongs service life, enables an excavator to be operated stably and reliably, and reduces energy consumption.

Description

technical field [0001] The invention relates to an excavator oil return pressure control circuit, which belongs to the technical field of engineering machinery oil return pressure control. Background technique [0002] At present, during the working process of the excavator, the oil return pressure often exceeds the maximum allowable pressure of the system. The reason for this phenomenon is mainly due to the pressure loss of the back pressure valve on the oil return road, the pressure loss of the radiator and the pressure loss of the oil return filter. caused by superposition. When the oil return pressure exceeds the allowable maximum pressure value, the working life of the rotary motor and the oil return filter element will be reduced, the performance of the radiator will be damaged, and the system will operate abnormally. At the same time, the oil return pressure loss will increase and the energy consumption will increase. At present, in order to reduce the oil return pre...

AI Technical Summary

Problems solved by technology

When the oil return pressure exceeds the allowable maximum pressure value, it will cause problems such as reduced working life of the rotary motor and oil return filter element, damage to the performance of the radiator, and abnormal operation of the system. At the same time, the loss of oil return pressure will increase and the energy consumption will increase.

At present, in order to reduce the oil return pressure value, a bypass valve is connected in parallel on the oil return line, but the bypass valves are all proportional bypass valves, the pressure loss of the bypass valve is low when the oil return flow is small, and the bypass valve The pressure loss is high. When the return oil flow rate is large, the bypass valve cannot limit the return oil pressure value within a certain safe range.

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