Hydraulic systems for construction machinery

Abstract

The invention discloses a hydraulic system used for engineering machinery. The hydraulic system used for the engineering machinery comprises a first rod cavity and a second rod cavity, and a main oil cylinder arranged on a first rodless cavity and a second rodless cavity, a swing oil cylinder, a pump set and an integrated valve set. The integrated valve set comprises a valve set body, a plurality of inserting valve components, a constant pressure pump outlet valve set, a communication valve set, a concrete reduction solenoid valve and an energy storing device, wherein the integrated valve set body is arranged on the upper portion of the main oil cylinder and a controlling channel is formed, the multiple inserting valve components are integrated on the integrated valve set body to control the switching on and switching off of an oil pipeline to select the switching of high-pressure pump, low-pressure pumping, high-pressure and low-pressure pumping and reversing of a swing oil cylinder. According to the hydraulic system used for the engineering machinery, the reversing of the main oil cylinder and switching of the high-pressure pumping and the low-pressure pumping of the system are achieved through integration of functional valves, at the same time an electro-hydraulic directional control valve, and a one-way valve and the like used for a distributing system are integrated on the functional valves, the hydraulic system used for the engineering machinery is small in size, high in integrated degree, and simple and clear in system arrangement.

Description

technical field [0001] The invention relates to the field of engineering machinery design, in particular to a hydraulic system for engineering machinery. Background technique [0002] At present, the hydraulic system used in commercial mixing equipment is 32-diameter (DN32) electro-hydraulic directional valve to complete the reversing of the main cylinder, 16-diameter electro-hydraulic directional valve to complete the reversing of the swing cylinder, and the electronically controlled high and low pressure switching valve (DN32) Complete the high and low pressure switching of the pumping system. [0003] In the traditional system, the functional modules are scattered, the space usage is large, and the system layout is relatively complicated. At the same time, the spool valve type reversing valve used in the past has small flow capacity, high manufacturing precision, large valve core size, long reversing time, and large reversing impact. With the development trend of high pr...

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Problems solved by technology

[0003] In the traditional system, the functional modules are scattered, the space usage is large, and the system layout is complicated

At the same time, the spool type reversing valve used in the past has small flow capacity, high manufacturing precision, large valve core size, long reversing time, and large reversing impact. With the development trend of high pressure and large flow in commercial mixing equipment systems, this The disadvantages of the system are becoming more and more obvious

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