Pilot control valve block, core opening and closing hydraulic system and engineering machine

A pilot control valve and hydraulic system technology, which is applied in the direction of mechanical equipment, fluid pressure actuators, servo motor components, etc., can solve problems such as failure to meet the use requirements, poor micro-motion, and no proportional control

Inactive Publication Date: 2015-12-09
XCMG CONSTR MACHINERY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing quantitative and variable combination system has poor micro-movability, because the confluence valve block is mostly controlled by on-off valves, and there is no proportional control feature. Quantitative and variable combination systems cannot meet the requirements of use

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  • Pilot control valve block, core opening and closing hydraulic system and engineering machine
  • Pilot control valve block, core opening and closing hydraulic system and engineering machine
  • Pilot control valve block, core opening and closing hydraulic system and engineering machine

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Embodiment Construction

[0035] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0036] The specific embodiments of the present invention are for the convenience of further description of the concept of the present invention, the technical problems to be solved, the technical features constituting the technical solution and the technical effects brought about. It should be noted that the description of these embodiments does not constitute a limitation of the present invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0037] Due to the low reliability of the existing quantitative and variable combination system for the control of the variable pump, the energy loss is relatively large, resulting in unnecessary waste. The present invention designs a pilot ...

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PUM

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Abstract

The invention relates to a pilot control valve block, a core opening and closing hydraulic system and an engineering machine. The pilot control valve block is used for a combined system of a constant displacement pump system and a variable displacement pump system. The constant displacement pump system supplies oil to at least one first executing unit, and the variable displacement pump system supplies oil to at least one second executing unit. The pilot control valve block comprises a variable feedback unit, the variable feedback unit screens a large load pressure signal out of load pressure signals of the first executing unit and the second executing unit, and the large load pressure signal is used as a load feedback signal and output to a variable control mechanism of a variable displacement pump of the variable displacement pump system, so that the variable control mechanism controls the oil pump capacity of the variable displacement pump on the basis of the large load pressure signal which is obtained through screening; time-shared control over the variable displacement pump is achieved, reliable and stable control over the variable displacement pump is achieved, and energy losses are reduced.

Description

technical field [0001] The invention relates to the field of construction machinery, in particular to a pilot control valve block, an opening and closing core hydraulic system and construction machinery. Background technique [0002] Construction machinery has a wide range of uses, and different uses and complex working conditions determine the complexity of its hydraulic system. At present, the common construction machinery hydraulic systems include quantitative systems, quantitative and variable combination systems, and full variable systems. Quantitative system has low cost, but large energy loss; full variable system has obvious energy-saving effect, but its cost is high, which is not conducive to popularization; quantitative and variable combination system will turn to variable hydraulic system, and the cost increase is not large, compared with its energy-saving effect. In other words, the quantitative and variable combination system has a high cost performance. [00...

Claims

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Application Information

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IPC IPC(8): F15B13/02F15B13/16
Inventor 谢朝阳沈勇任大明张安民马鹏鹏赵梅王苏东
Owner XCMG CONSTR MACHINERY
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