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Double pump-motor hydraulic driving system for lifting oil cylinder of engineering machine

A technology for lifting oil cylinders and construction machinery, which is applied to fluid pressure actuation system components, mechanical equipment, fluid pressure actuation devices, etc., which can solve problems such as noise and vibration, energy waste, and life reduction, and reduce throttling losses , reduce the installed power, maintain the effect of operability

Inactive Publication Date: 2007-01-24
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

[0005] The oil cylinder is a commonly used actuator in construction machinery. Its working feature is frequent reciprocating motion, that is, it needs to lift and lower heavy objects repeatedly. The lifting force is large and it often bears negative loads. Both potential energy and braking energy are converted into throttling loss of the hydraulic system, which not only causes energy waste, but also causes heat, noise and vibration, and even system failure and life reduction.

Method used

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  • Double pump-motor hydraulic driving system for lifting oil cylinder of engineering machine

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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: two pumps—motors 1, 3, frequency conversion motor 2, two proportional directional valves 4, 9, oil cylinder 5, three one-way valves 6, 7, 11, overflow valve 8, speed-increasing valve 10, Control handle 12, signal control unit 13 and frequency converter 14; their interconnection relationship is as follows:

[0024] 1) The variable frequency motor 2 is coaxially connected with the first and second pump-motors 1 and 3 whose displacement ratio is equal to the area ratio of the two cavities of the oil cylinder 5;

[0025] 2) The P port and T port of the first proportional directional valve 4 are respectively connected with the oil discharge port and the oil suction port of the second pump-motor 3, and the B port of the first proportional directional valve 4 is connected with the rodless cavity of the oil cylinder 5. Port A of a proport...

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Abstract

The double pump-motor hydraulic driving system for lifting oil cylinder of engineering machinery has two pumps and one motor connected coaxially; frequency varying motor driving the hydraulic system and recovering the inertial energy, and gravitational potential energy and braking energy in the operation course of the executing mechanism; proportional direction valve to control the direction of the executing element to act as control valve at low speed and small flow rate and control the recovery of energy. While needing relatively high work speed, the double pump and the motor work in parallel to reach the required work speed. The present invention has the high response speed and high precision of valve controlled system and the high efficiency of pump controlled system as well as raised efficiency, relatively high work speed and low element cost.

Description

technical field [0001] The invention relates to a hydraulic control system characterized by electro-hydraulic control technology, in particular to a double-pump-motor hydraulic drive system for lifting oil cylinders of engineering machinery. 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. [0003] The current research on energy saving 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 and improving the power matching of diesel engine-hydraulic system-actuato...

Claims

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Application Information

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