Double pump-motor hydraulic drive system for a hydraulic motor of engineering machinery

A technology of hydraulic motors and construction machinery, which is applied in the directions of fluid pressure actuation system components, mechanical equipment, fluid pressure actuation devices, etc. The effect of throttling loss, reducing installed power, and maintaining operability

Inactive Publication Date: 2005-09-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Hydraulic motor is a commonly used hydraulic actuator in construction machinery. Its working characteristics are frequent forward and reverse conversion, frequent load load, relatively large moment of inertia, frequent braking and relatively large loss of

Method used

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  • Double pump-motor hydraulic drive system for a hydraulic motor of engineering machinery

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with drawings and embodiments.

[0023] The present invention includes: speed-increasing valve 1, oil supply system 2, two pumps-motors 3, 10, proportional directional valve 4, hydraulic motor 5, control handle 6, signal control unit 7, frequency converter 8 and frequency conversion motor 9; The interconnection relationship is as follows:

[0024] 1) The variable frequency motor 9 is coaxially connected with the first and second pump-motors 3 and 10 with the same displacement respectively;

[0025] 2) The P port of the proportional directional valve 4 is respectively connected with the oil discharge port of the first pump-motor 3 and the oil port B of the speed-increasing valve 1, and the T port of the proportional directional valve 4 is respectively connected with the oil suction port of the second pump-motor 10 1. The oil outlet of the first one-way valve of the oil supply system 2 is connected to t...

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Abstract

The invention discloses a double pump motor hydraulic pressure driving system of engineer mechanism hydraulic pressure motor. The two pumps and the motor are connected on the same shaft. The frequency conversion motor drives hydraulic pressure system and recycle the inertia energy, gravitational potential energy and braking energy produced in the working process of the executing mechanism. Ratio direction valve controls the reversing of the executing component and has the valve controlling function while in low speed low flux and can be used to recycle energy. When the working speed is fast, the double pump and motor would work in parallel to satisfy the working demand. The invention improves the response accuracy and the efficiency, decreases the cost.

Description

technical field [0001] The invention relates to a hydraulic control system characterized by electro-hydraulic control technology, in particular to a construction machinery hydraulic motor double pump-motor hydraulic drive system. Background technique [0002] In recent years, with the development of industrial technology worldwide, the problems of energy shortage and environmental pollution have become increasingly serious. Construction machinery mostly adopts a diesel engine-hydraulic system-multi-actuator drive scheme, which has high fuel consumption and poor emissions. Its energy-saving issues have attracted widespread attention in the industry. Motors are commonly used actuators in construction machinery. [0003] The current research on the energy saving of rotary motors of construction machinery is mainly reflected in the following three aspects: improving the performance of working components (diesel engine and hydraulic components), improving the hydraulic system an...

Claims

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Application Information

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IPC IPC(8): E02F9/22F15B15/18F15B21/02
Inventor 王庆丰张彦廷肖清付强
Owner ZHEJIANG UNIV
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