Load sensitive turning hydraulic system of loading machine

Abstract

The invention discloses a load sensitive turning hydraulic system of a loading machine. The load sensitive turning hydraulic system is characterized in that a load sensitive constant pressure variable plunger pump supplies working oil pressure to a flow enlarging valve and a turning machine; a load feedback pressure signal of the flow enlarging valve controls an LS control valve of a first load sensitive constant pressure variable plunger pump; an oil port L of the turning machine is communicated to the right end of a main valve core L of the flow enlarging valve; an oil port R is communicated to the right end of a main valve core R of the flow enlarging valve; the load sensitive constant pressure variable plunger pump supplies the working oil pressure to a load sensitive turning valve and a pilot valve; and four control ends of the pilot valve are respectively communicated with the load sensitive turning valve. The load sensitive turning hydraulic system of the loading machine also comprises a turning system and convergence systems of other working systems. The load sensitive turning hydraulic system of the loading machine has the advantages that the variable displacement function of the load sensitive constant pressure variable plunger pump is fully used, so that the displacement of a turning pump is increased, and the turning performance is improved; and fuel is saved, and the working efficiency is improved. The flow enlarging valve is simple in structure, and domestication is also realized; the cost of the flow enlarging valve is lower than that of an imported flow enlarging valve; and batch production can be realized.

Description

technical field [0001] The invention relates to a steering hydraulic system for engineering machinery, and is particularly suitable for a load-sensitive steering hydraulic system of a loader. Background technique [0002] A common loader is composed of a steering system and a working system, and the steering system and the working system are either independent or combined. In the quantitative system, in order to meet the performance requirements of the steering at idle speed and high speed, and at the same time meet the requirements of reducing the energy loss of the steering system, the steering pump is generally selected to be small, and it is smaller or equal to the working pump in the confluence system. If the above two requirements are taken into account, the steering performance of the steering system at low speeds will deteriorate. The main problems are slow response and slow steering speed, resulting in low steering efficiency and high labor intensity for the driver....

AI Technical Summary

Problems solved by technology

If the above two requirements are taken into account, the steering performance of the steering system at low speeds will deteriorate. The main problems are slow response and slow steering speed, resulting in low steering efficiency and high labor intensity for the driver.

This affects the performance and return on investment of the entire loader

Images