Built-in constant-pressure output control pressure source module

Abstract

The invention discloses a built-in type constant pressure outputting controlled pressure source module, which is characterized by the following: comprising module body; opening pivoted oil pump inlet P, multiport proportion operating valve group rotating group outlet P', controlled pressure outlet Y1, Y2 and draining mouth T'; dividing the rotating oil pump inlet P to at least two ways; connecting the one way to the multiport proportion operating valve group rotating group outlet P'; connecting the other way to filter F; dividing the other end of the filter F to two way through adjustable pressure output pressure relief valve Rd; connecting one way to the controlled pressure outlet Y1, Y2 through each one-way valve S; connecting the other way to the draining mouth T' through adjustable pressure-limiting valve Rf. This invention possesses compact structure, which can decrease cost.

Description

technical field [0001] The invention relates to the technical field of a control pressure oil source of a hydraulic system on a crane. Background technique [0002] As we all know, the hydraulic system of a hydraulic vehicle on a crane (hydraulic engineering machinery) must be equipped with a control pressure oil source, providing hydraulic control multi-way proportional control valves, electro-hydraulic multi-way proportional control valves, winch brake release and other hydraulic control For pressure, most construction machinery manufacturers in China have specially set up control oil pumps and control circuits in the system, which increases the complexity of the system, increases the piping, and increases the manufacturing cost. For this reason, some design and manufacturing companies canceled the special control oil pump during the system design, but additionally set a pressure reducing valve and an accumulator in the system, installed outside the multi-way proportional ...

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Problems solved by technology

[0002] As we all know, the hydraulic system of a hydraulic vehicle on a crane (hydraulic engineering machinery) must be equipped with a control pressure oil source, providing hydraulic control multi-way proportional control valves, electro-hydraulic multi-way proportional control valves, winch brake release and other hydraulic control For pressure, most construction machinery manufacturers in China have specially set up control oil pumps and control circuits in the system, which increases the complexity of the system and the piping, which increases the manufacturing cost

For this reason, some design and manufacturing companies canceled the special control oil pump during the system design, but additionally set a pressure reducing valve and an accumulator in the system, installed outside the multi-way proportional control valve, connected with pipelines, from the control The input pressure is obtained from the valve, and then the control pressure is output from the external pressure reducing valve. This structural arrangement makes the size large, increases the floor area, and increases the production cost. Due to the large fluctuation of the input pressure, sometimes as high as 20MPa, it affects the stability of the output control pressure. properties, so further improvements in the design are required

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