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Refined operation hydraulic system of engineering machinery

A technology for hydraulic systems and construction machinery, applied in the field of hydraulic systems, can solve the problems of incoherent movements, difficult and refined operations, and abnormal noises in work attachments and pipelines, and achieves high reliability, simple principles, and excellent fine operation performance. Effect

Active Publication Date: 2015-05-06
LIUZHOU LIUGONG EXCAVATORS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcomings of the existing hydraulic system, such as the abnormal sound of the work attachment pipeline and the incoherence of the action, which makes it difficult to carry out fine operation due to the replacement of different work attachments, and to provide a method that can be used when replacing different hydraulic work attachments. Adjust the oil return throttling strength to meet the action needs of construction machinery and finely operate the hydraulic system

Method used

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  • Refined operation hydraulic system of engineering machinery
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  • Refined operation hydraulic system of engineering machinery

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Embodiment 1

[0017] Such as figure 1 As shown, in the fine operation hydraulic system of construction machinery in the present invention, the system includes a main valve 2, a main pump 3 as a working pressure oil source, a hydraulic cylinder as a hydraulic actuator, and a pilot valve (not shown in the figure), The pilot valve has a left signal source port Pa1 and a right signal source port Pb1, the main pump 3 is connected to the working oil inlet port of the main valve 2, and the hydraulic oil from the pump in the hydraulic oil tank 4 is supplied to the main valve 2, and the hydraulic cylinder 5 passes through The left pipeline and the right pipeline are correspondingly connected to the two working oil ports of the main valve 2, and also include: a differential pressure sensor 1, a controller 7, a proportional control knob 6 as an electric proportional adjustment device, and an electric proportional pressure reducing valve 8 , the shuttle valve 10, the first hydraulically controlled two...

Embodiment 2

[0024] Compared with Embodiment 1, this embodiment differs in that in this embodiment, the electric proportional pressure reducing valve is not connected to the left signal source end and the right signal source end of the pilot valve through a shuttle valve, such as figure 2 As shown, there are two electric proportional pressure reducing valves in this embodiment, wherein the oil inlet of the electric proportional pressure reducing valve 8 located on the right side is directly connected with the right signal source end Pb1 of the pilot valve, and the oil inlet of the electric proportional pressure reducing valve 8 The oil outlet is connected to the other oil inlet of the first hydraulically controlled two-position three-way valve 9, and the oil inlet of the second electric proportional pressure reducing valve 13 located on the left side is directly connected to the left signal source end Pa1 of the pilot valve. The oil outlet of the second electric proportional pressure reduc...

Embodiment 3

[0026] Such as image 3 As shown, compared with Embodiment 2, the difference of this embodiment is that the oil outlet of the electric proportional pressure reducing valve 8 directly communicates with the pilot hydraulic control right end Pb2 of the main valve 2, and the oil outlet of the second electric proportional pressure reducing valve 13 port directly communicates with the pilot hydraulic control left end Pa2 of the main valve 2, and the electric control ends of the electric proportional pressure reducing valve 8 and the second electric proportional pressure reducing valve 13 are respectively connected with the control signal output end of the controller 7, and the controller has The electrical signal input terminal L4 is used to select the working mode of the hydraulic system, that is, to select the electrical signal input in the refined operation mode or in the normal operation mode. In this embodiment, if the normal operation state mode is carried out, the electrical ...

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Abstract

The invention discloses a refined operation hydraulic system of engineering machinery, relates to a hydraulic system and discloses a refined operation hydraulic system in order to overcome the disadvantages of an existing hydraulic system that since load change is caused by replacing different working accessories, abnormal sound is generated in a working pipeline, the movement is incoherent, and refined operation is difficult to carry out. The refined operation hydraulic system is characterized in that a differential pressure sensor is used for detecting the differential pressure between a left pipeline and a right pipeline of a hydraulic actuator; a controller is connected with the differential pressure sensor to output an electric control signal; an electric proportional regulation device is used for carrying out equal proportional regulation on the output electric control signal of the controller; the electric control end of an electric proportional decompression valve is connected with the controller to receive the electric control signal of the controller, and the electric proportional decompression valve is used for correspondingly transmitted decompressed pilot pressure to the pilot hydraulic control end of a main valve after the pilot pressure of the left signal source end or the right signal source end of a pilot valve is decompressed. According to the refined operation hydraulic system disclosed by the invention, the oil inlet / return throttling intensity can be enlarged to meet the movement needs when a refined operation mode is selected according to operation needs of an operator, and the action state of a working device can be continuously regulated through the proportional regulation device to achieve the best refined operation performance.

Description

technical field [0001] The invention relates to a hydraulic system, in particular to a hydraulic system for refined operation of engineering machinery. Background technique [0002] In the equipment driven by hydraulic pressure, the hydraulic oil pump drives the hydraulic oil to the hydraulic actuator through the main valve, and the pilot pressure acts on both ends of the main valve spool to control the reversing of the main valve to realize the hydraulic actuation of the main valve control. For the action of the components, when matching the hydraulic system, there is a corresponding fixed relationship between the pilot pressure characteristic and the opening degree of the hydraulic main spool. As hydraulic equipment, in order to meet the requirements of different regions and different working conditions, it is necessary to add quick change devices or various forms of attachments at the end of the working device, so the weight of the end of the working device changes, and ...

Claims

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Application Information

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IPC IPC(8): F15B13/043F15B13/044
CPCF15B13/0431F15B13/044F15B2013/0448
Inventor 胡勇冯立霞李欲江
Owner LIUZHOU LIUGONG EXCAVATORS
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