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Configuration design method for controlling multiple pump sources of hydraulic system through digital and analogue combination

A hydraulic system and combined control technology, applied in the hydraulic field, can solve the problems of low accuracy of continuous quantity simulation, difficult to switch at high frequency, difficult to meet engineering needs, etc., and achieve obvious energy saving effect, less overflow loss, and continuously adjustable output flow. Effect

Active Publication Date: 2015-12-09
YANSHAN UNIV
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Problems solved by technology

[0006] However, the hydraulic system of the hydraulic press in the forging industry usually has the characteristics of high pressure and large flow. It is not easy to perform high-frequency switching when it adopts digital control. The flow output is obviously stepped.

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  • Configuration design method for controlling multiple pump sources of hydraulic system through digital and analogue combination
  • Configuration design method for controlling multiple pump sources of hydraulic system through digital and analogue combination
  • Configuration design method for controlling multiple pump sources of hydraulic system through digital and analogue combination

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0031] exist figure 1 Figure (a) shows the respective output flow curves of the fixed pump group and the variable pump group, and the figure (b) shows the quantitative The sum of the output flow of the pump group and the variable pump group. Quantitative pumps controlled indirectly by digital quantities can output stepped flow, and variable pumps controlled by analog can output continuously changing flow.

[0032] The number and displacement of quantitative pumps and variable pumps in the multi-pump source system are determined by the method of flow area division. Set the number of pumps as m and the displacement as D i , the corresponding output flow is Q Di , and Q Di ≤Q D(i+1) , 1≤i≤m; the number of variable pumps is n, and the maximum displacement is γ j , the output flow at full displacement is Q Ajmax , 1≤j≤n; the principle of equidistant segmentation is...

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Abstract

The invention relates to a configuration design method for controlling multiple pump sources of a hydraulic system through digital and analogue combination. The configuration design method mainly comprises the following steps: (1), obtaining a flow demand Q(t), a maximal flow value Qmax and an absolute value h of a maximal flow change rate required by the hydraulic system according to action requirements of hydraulic equipment; (2), determining an optimal combination coefficient lamdaof a quantitative pump set and the discharge capacity D1 of a minimal pump in the quantitative pump set according to a theoretical formula provided by the invention; (3), determining the number m of quantitative pumps and the maximal discharge capacity Dk of the pumps according to the theoretical formula provided by the invention; and (4), determining the number n and the full discharge capacity gammaj of variable pumps. According to the invention, flow matching of a load is realized; the configuration design method has the advantages of being rapid to respond, free from overflow loss, high in transmission efficiency and continuous and adjustable in output flow; the configuration design method has the advantages of the traditional valve control system and pump control system; and furthermore, the disadvantages of being high in investment of the pump control system and high in maintenance cost are avoided.

Description

technical field [0001] The invention belongs to the technical field of hydraulic pressure, and in particular relates to a configuration design method of an energy-saving multi-pump source hydraulic system. Background technique [0002] The forging hydraulic press is an important mechanical equipment in the machinery industry. The huge energy it consumes has always been the focus of people from all walks of life. Therefore, energy saving is a problem that must be solved in the development of the forging industry. [0003] At present, forging hydraulic presses can be divided into throttling control system and volume control system according to the way of power adjustment. The former adopts a valve control system with a plug-in large-bore electro-hydraulic proportional throttle valve as the control core, and the latter adopts a pump control system driven and controlled by a high-response radial piston variable pump. The advantages of throttling control are wide frequency band,...

Claims

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Application Information

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IPC IPC(8): G06F17/50F15B11/00
Inventor 赵劲松姚静张阳
Owner YANSHAN UNIV
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