Hydraulic load-sensing control arrangement

Abstract

A hydraulic load-sensing control arrangement for a first and second hydraulic consumer (A1; A2, B2) is disclosed. A variable displacement pump (3) having load-sensing regulation (43) is provided therein. The highest respective load-sensing pressure of consumers is reported to the load-sensing regulation. In this connection, the first consumer has the highest load pressure in normal operation and therefore the highest load-sensing pressure dependent on the load pressure. In addition, a pressure reducing valve (4) is provided, which is arranged in the pressure medium flow path between the variable displacement pump and the first consumer. A spring force from a regulating spring (6) and a regulating pressure (8) dependent on the load pressure of the first consumer are applied to a valve gate in this pressure reducing valve in the opening direction thereof and pressure (4) is applied directly downstream from the pressure reducing valve in the closing direction thereof. In order to ensure that the valve gate of the pressure reducing valve is advantageously fully open in normal operation, a pressure equivalent of the spring force of the regulating spring and the regulating pressure are greater than a pressure of the variable displacement pump.

Description

technical field [0001] The invention relates to a hydraulic load-sensing control system for a plurality of hydraulic consumers according to the preamble of claim 1 . Background technique [0002] One such control system is disclosed in US 7,654,337 B2. It serves to control a drilling unit which has a first hydraulic consumer in the form of a hydraulic beating device and a second hydraulic consumer in the form of a hydraulic feed device. The first consumer is connected via a supply line to an adjustment pump. An electrically operable switching valve is arranged in the supply line for switching the first consumer on and off. A pressure reducing valve is arranged downstream of the switching valve between it and the first consumer. In this case, the valve body of the pressure reducing valve is loaded in its opening direction by the spring force of a valve spring and a load sensing pressure which is related to the load pressure of the first consumer, and in its closing directi...

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of this solution is that in normal operation the hammering device (first consumer) is the most loaded consumer, the pressure relief valve regulates the pressure according to the difference in pressure equivalents of the pump Δp and the spring force of the spring

Since the pump Δp is usually 30 bar, which is significantly higher than the pressure equivalent of the spring force of the spring, for example 15 bar, the valve body of the pressure relief valve is in normal operation of the control system between its closed position and the open position in a regulating operation. , which leads to an energy loss in the control system

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