A kind of construction machinery and its split-merge hydraulic control system
A technology of hydraulic control system and construction machinery, applied in mechanical equipment, fluid pressure actuating device, servo motor, etc., can solve problems such as interference of the second working link, affecting the composite action performance of the hydraulic system, spool jitter, etc.
Inactive Publication Date: 2014-10-15
SANY AUTOMOBILE HOISTING MACHINERY
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[0005] When the combined work of the first working couplet and the second working couplet is required, the split and confluence valve 4 is placed in the upper working position, and the first hydraulic pump and the second hydraulic pump respectively supply oil to the first working couplet and the second working couplet; if Start the second working group first, and then start the first working group. Since the first load feedback oil circuit and the second load feedback oil circuit are connected to the oil inlet a and the oil inlet b of the shuttle valve 2 at the same time, the first load feedback pressure PL1 and the second load feedback pressure PL2 act on the spool of shuttle valve 2 in opposite directions at the same time, which will cause the spool to vibrate and produce a certain impact, causing the second working couple to be interfered by the first working couple, which seriously affects the Composite Action Performance of Hydraulic System
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[0031] The core of the present invention is to provide a split-and-merge hydraulic control system for construction machinery, which can avoid shock and vibration when the first working coupler and the second working couple perform compound actions, and improve the hydraulic pressure of the split-merge hydraulic control system during compound actions. work stability and reliability. Another core of the present invention is to provide a construction machine including the above-mentioned split-merge hydraulic control system.
[0032] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0033] Please refer to Figure 2 to Figure 4 , figure 2 It is a hydraulic schematic diagram of a specific embodiment of the split-merge hydraulic system provided by the present invention; image 3 ...
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Disclosed in the present invention is a flow distributing and converging hydraulic control system for an engineering machine, which comprises: a first oil supplying pipeline and a second oil supplying pipeline communicated or disconnected through a flow distributing and converging valve (4); a first load feedback oil pipeline and a second load feedback oil pipeline respectively connected with a first oil inlet and a second oil inlet of a shuttle valve (2), wherein an oil outlet of the shuttle valve (2) is communicated with the second oil supplying pipeline through a second flow compensation valve (6); and a pressure stop valve (1), wherein the first load feedback oil pipeline is communicated or disconnected with the first oil inlet of the shuttle valve (2) through the pressure stop valve (1). Also disclosed in the present invention is the engineering machine, which comprises a vehicle loading portion adopting the above flow distributing and converging hydraulic control system. When a second working link is started prior to a first working link, the hydraulic control system can avoid the influence such as impact and vibration to the second working link caused by the first working link and so on.
Description
technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a split-merge hydraulic control system for engineering machinery. In addition, the present invention also relates to a construction machine comprising the above-mentioned split-merge hydraulic control system. Background technique [0002] Crane is a kind of commonly used engineering machinery. At present, in small and medium-sized cranes, two pumps are usually used to supply oil to the working oil circuit. Please refer to figure 1 , figure 1 It is a hydraulic schematic diagram of a split-merge hydraulic control system in the prior art; the following briefly introduces the defects in the working process of this split-merge hydraulic control system. [0003] In the prior art, such as figure 1 As shown, the split-merge hydraulic control system includes a first oil supply circuit for supplying oil to the first working couple and a second oil supply passage for suppl...
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IPC IPC(8): F15B13/16
CPCF15B11/055F15B2211/45F15B2211/6054F15B13/026F15B2211/50536
Inventor 彭勇刘正雷易曦
Owner SANY AUTOMOBILE HOISTING MACHINERY