Detection method for constant-flow oil return channel

Abstract

The invention discloses a detection method for a constant-flow oil return channel. A throttling port is formed in an oil return channel in a multi-path reversing valve in a hydraulic system; pressure difference of oil is generated through the throttling port; pressure in front of the throttling port is guided to a hydraulic pump displacement mechanism for controlling the displacement of a hydraulic pump; a bypass oil return channel of a multi-path valve is provided with a flow detection element; the bypass oil return flow is set and controlled to be a smaller constant value; a connecting section between the displacement pump and an operating valve in the hydraulic system is provided with a fluidic sensor for performing flow detection, and control over the displacement of the hydraulic pump is completed in cooperation with a negative flow control valve existing in a pipeline; the outlet pressure of the negative flow control valve is used for controlling a servo oil cylinder of the displacement pump; and meanwhile, a pressure cutoff valve is arranged at adjacent positions of every each negative flow control valve respectively. The detection method has the beneficial effects that: overflow loss and system heating in the conventional hydraulic excavator are avoided, the fuel oil consumption is lowered, and the aim of saving energy is fulfilled.

Description

technical field [0001] The invention relates to the field of hydraulic technology, in particular to a method for detecting a constant flow oil return channel. Background technique [0002] The hydraulic system has the advantages of large power, good adjustability of working pressure and flow, heat can be brought back to the oil tank, etc. However, there are multiple energy conversions in hydraulic transmission, and the hydraulic oil tank causes potential environmental pollution and oil loss. Therefore, hydraulic technology must improve the performance of hydraulic transmission and control in order to meet the needs of sustainable development and energy saving. Mechanical transmission competitiveness. At present, mainstream excavators still use multi-way valve as the main control valve. The main power loss of this type of system includes throttling loss, overflow loss during the starting and braking process of the slewing mechanism, potential energy loss and throttling durin...

AI Technical Summary

Problems solved by technology

However, there are multiple energy conversions in hydraulic transmission, and the hydraulic oil tank causes potential environmental pollution and oil loss. Therefore, hydraulic technology must improve the performance of hydraulic transmission and control in order to meet the needs of sustainable development and energy saving. Mechanical transmission competitiveness

At present, mainstream excavators still use multi-way valve as the main control valve. The main power loss of this type of system includes throttling loss, overflow loss during the starting and braking process of the slewing mechanism, potential energy loss and throttling during the boom lowering process. Losses and losses caused by poor matching of engine and hydraulic system power

With the development of hydraulic energy-saving technology, the hydraulic system of excavators has developed into various control methods such as negative flow control, positive flow control and load sensitive control. Limited and highly affected by load, these will lead to low product share