Excavator hydraulic energy-saving control circuit and control method

Abstract

Disclosed are a hydraulic energy-saving control loop and control method of an excavator. The hydraulic energy-saving control loop comprises a rotation motor, a hydraulic multi-path valve set, a hydraulic oil tank, a radiator, a hydraulically controlled switchover valve, a first back pressure valve, a second back pressure valve and an oil supplementing path, wherein the hydraulic oil tank is connected with an oil return opening of the rotation motor sequentially through the radiator, the second back pressure valve, an oil return opening of the hydraulic multi-path valve set and the oil supplementing path; the first back pressure valve is a hydraulically controlled back pressure valve; a hydraulic control opening of the first back pressure valve is connected with a pilot pump through the hydraulically controlled switchover valve; the control end of the hydraulically controlled switchover valve is connected with a pressure control signal of a pilot handle for controlling the output pressure of the rotation motor, and the control end of the pilot pump is connected with the hydraulic oil tank. The hydraulic energy-saving control loop is simple in structure, prevents the rotation motor from not sucking air and reduces the return oil back pressure; a return oil back pressure value is set before the rotation motor stops operating, air suction in the rotation stopping process of the rotation motor is avoided, temperature rise and the temperature of the whole system are reduced, the output power of a main pump is reduced, oil consumption is effectively lowered, and working efficiency is effectively improved.

Description

technical field [0001] The invention relates to an excavator hydraulic energy-saving control circuit and a control method, in particular to a control circuit and a method for returning oil back pressure from a hydraulic multi-way valve group of an excavator to a hydraulic oil tank. Background technique [0002] In hydraulic excavators, in order to prevent the slewing motor of the hydraulic actuator from being sucked, it is necessary to add the first back pressure valve on the oil supply circuit of the hydraulic system, so that the back pressure of the return oil from the hydraulic multi-way valve group to the hydraulic oil tank is high enough to ensure the slewing The oil replenishment during the motor braking process can effectively protect the swing motor, but because the pressure of the first back pressure valve is too high, the back pressure of the whole system will be too high, so the second back pressure valve is added, In order to solve the problem that the back press...

AI Technical Summary

Problems solved by technology

Although adopting the above structure can solve the air suction and high back pressure of the rotary motor, due to the very large amount of oil returned, even if the back pressure value is not high, the power consumed by the back pressure valve will be very large, reaching an average of 3% of the engine power. %, some even reach 5% power consumption, so the energy consumption is large, resulting in a waste of energy

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