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Telescopic hydraulic system and operation machine

A hydraulic system and operating machinery technology, applied in mechanical equipment, cranes, fluid pressure actuation devices, etc., can solve problems such as high cost and low efficiencies of outrigger arms, improve efficiency, increase oil return flow, and increase production costs Effect

Active Publication Date: 2021-05-07
SANY AUTOMOBILE HOISTING MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a telescopic hydraulic system and working machinery to solve the problems of low boom extension efficiency and high cost in the telescopic hydraulic system in the prior art

Method used

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  • Telescopic hydraulic system and operation machine

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Embodiment Construction

[0025] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.

[0026] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right" , "vertical", "horizontal", "top", "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing this The embodiments and simplified descriptions of the invention do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed a...

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Abstract

The embodiment of the invention provides a telescopic hydraulic system and an operation machine, and relates to the field of engineering mechanical equipment. The telescopic hydraulic system comprises a telescopic oil cylinder, a proportional reversing valve, a telescopic balance valve and a differential switching valve, wherein the telescopic oil cylinder is provided with a rodless cavity and a rod cavity, the proportional reversing valve comprises a first oil control port and a second oil control port, the first oil control port communicates with the rodless cavity through a first oil way, the second oil control port communicates with the rod cavity through a second oil way, the telescopic balance valve is arranged on the first oil way and communicates with the second oil way, and the differential switching valve communicates with the first oil way, the second oil way and the proportional reversing valve. The hydraulic system realizes differential extension of the telescopic oil cylinder through the differential switching valve, so that the boom extending efficiency is improved, an oil return channel of the rodless cavity of the telescopic oil cylinder are increased through the differential switching valve, the oil return flow of the oil return channel of the rodless cavity is increased, the telescopic arm retracting efficiency is further improved, and due to the fact that the telescopic oil cylinder is not changed and only the differential switching valve is added, the production cost is not increased.

Description

technical field [0001] The invention relates to the field of construction machinery equipment, in particular to a telescopic hydraulic system and an operating machine. Background technique [0002] At present, the telescopic arm of the automobile crane is extended and retracted by the telescopic oil cylinder, and the oil is fed into the rodless chamber of the telescopic cylinder through the electro-hydraulic proportional valve, and the oil from the rod chamber is returned to the oil tank through the electro-hydraulic proportional valve, and the oil cylinder is stretched out. The arm is stretched out; oil enters the rod chamber of the telescopic cylinder through the electro-hydraulic proportional valve, and the oil from the non-rod chamber returns to the oil tank through the electro-hydraulic proportional valve, the oil cylinder retracts, and the telescopic arm of the crane retracts. The locking of the oil cylinder is realized by the telescopic balance valve, and the speed re...

Claims

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Application Information

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IPC IPC(8): F15B11/08B66C23/693B66C23/683
CPCF15B11/08B66C23/701B66C23/68
Inventor 杨耀祥王尚杨浩波
Owner SANY AUTOMOBILE HOISTING MACHINERY