Combination valve with load sensitive function and capable of controlling inlet and outlet oil ways independently

Abstract

The invention discloses a combination valve with a load sensitive function and capable of controlling inlet and outlet oil ways independently. The combination valve comprises multiple unions of valve banks, a supply oil way P, a return oil way T and a load sensitive oil way LS. The multiple unions of valve banks comprise a plurality of valve bank bodies, the number of the valve bank bodies is not limited, and all the multiple unions of valve banks are the same in structural composition. Each union of valve bank in the multiple unions of valve banks comprises five two-position two-way electro-hydraulic proportional valves, two shuttle valves and a pressure compensation valve; after a controller receives active input signals of some union of valve bank, corresponding electronic control signals are sent to the corresponding five two-position two-way electro-hydraulic proportional valves according to corresponding control logic, therefore, flow of liquid entering a hydraulic cylinder and flow of the liquid flowing out of the hydraulic cylinder are controlled, and control over bidirectional movement of a hydraulic actuator is achieved. According to the combination valve, the load sensitive function and independent control over inlet and outlet oil ways are organically combined together, and the energy-saving characteristic of the load sensitive function is guaranteed; in addition, independent control over the inlet and outlet oil ways is achieved, a median function can be adjusted at will, and the combination valve has high efficiency and high response performance.

Description

technical field [0001] The invention relates to a combination valve with load sensitive function, in particular to a combination valve which can independently control the inlet and outlet hydraulic oil circuits and has multiple variable neutral functions. Background technique [0002] A load sensing system is a hydraulic circuit that senses system pressure-flow requirements and only provides the required flow and pressure. A complete device for load-sensing control consists of the following components: First, a variable displacement piston pump is required, which has a pressure compensator that allows it to remain on standby at a lower pressure when the system is not working. When the system is in the working state, the compensator senses the flow demand of the system and provides adjustable flow according to the flow demand when the system working condition changes. At the same time, hydraulic pumps also sense and respond to the pressure demands of the hydraulic system. T...

AI Technical Summary

Problems solved by technology

Since the spools of the load-sensing control valve are mechanically fixed together, this causes the spool to move in one direction while controlling the flow into and out of the hydraulic actuator, and the inherent repetitive throttling loss of the control mechanism causes valve control The system consumes a lot of energy and has low efficiency

For a certain hydraulic actuator, it is necessary to process a spool with a specific neutral function, so its interchangeability and economy are strictly limited

Images