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Pilot hydraulic control system with oil changing, buffering and stagnancy relieving functions

A technology of hydraulic control system and pilot control valve, which is applied in the direction of fluid pressure actuators, servo motor components, mechanical equipment, etc. It can solve the problems of slow start action of reversing valve and difficult preheating of hydraulic oil, etc., and achieve the elimination of start hysteresis Slow, fast start, improve the effect of preheating efficiency

Active Publication Date: 2012-11-21
LIUZHOU LIUGONG EXCAVATORS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a device that can eliminate the starting action of the reversing valve for the problems that the buffer device used in the existing pilot hydraulic control system will cause t

Method used

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  • Pilot hydraulic control system with oil changing, buffering and stagnancy relieving functions
  • Pilot hydraulic control system with oil changing, buffering and stagnancy relieving functions
  • Pilot hydraulic control system with oil changing, buffering and stagnancy relieving functions

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Embodiment 1

[0026] figure 2 A schematic diagram of the first pilot hydraulic control system of the present invention is shown. Such as figure 2As shown, the system includes a pilot control valve 10, a reversing valve 30, a first check valve 21, a second check valve 22, a first restrictor 23, a second restrictor 24, a fuel tank circuit, and stagnation oil The oil inlet of the first one-way valve 21 is connected to port 1 of the pilot control valve through the pipeline, the oil outlet is connected to the Xa chamber of the reversing valve 30 through the pipeline, and the second one-way valve The oil inlet of the valve 22 is connected to the port 2 of the pilot control valve 10 through the pipeline, the oil outlet is connected to the Xb cavity of the reversing valve 30 through the pipeline, and the first restrictor 23 is connected in parallel with the first one-way valve 21 Between the oil outlet and the oil inlet, the second throttle 24 is connected in parallel between the oil inlet and ...

Embodiment 2

[0031] image 3 It shows the schematic diagram of the second pilot hydraulic control system of the present invention, and the difference from the first embodiment lies in the oil change circuit. Such as image 3 As shown, the relief valve in the oil change circuit is a two-way relief valve 43 with two-way relief function. The oil inlet port of valve 22 communicates. The oil change process in this embodiment is as follows: the pilot control valve 10 is operated to make the hydraulic oil pass through port 1, and the first check valve 21 pushes the spool of the reversing valve 30 to the right limit position, so that the pressure in the left pipeline 51 is high. The pressure is set based on the overflow of the two-way relief valve 43, so that the two-way relief valve 43 is opened, and the second hydraulic control valve 26 is also opened at the same time. The preheated hydraulic oil passes through the port 1 of the pilot control valve 10, the first single After flowing to the ri...

Embodiment 3

[0033] Figure 4 It shows the principle diagram of the third pilot hydraulic control system of the present invention, the difference from the second embodiment lies in the oil change circuit. In this example, if Figure 4 As shown, one oil port of the two-way relief valve 43 is connected to the oil outlet of the first one-way valve 21, and the other oil port is connected to the oil outlet of the second one-way valve 22. When the engine is hot, the pilot control valve is operated to make the hydraulic oil Through port 1, the first one-way valve 21 pushes the spool of the reversing valve 30 to the right limit position, so that the pressure in the left pipeline 51 is higher than the overflow setting pressure of the two-way overflow valve 43, so that the two-way overflow The valve 43 is opened, and the second hydraulic control valve 26 is also opened at the same time, and the preheated hydraulic oil flows to The oil tank circuit realizes the replacement and preheating of the hyd...

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Abstract

The invention relates to a pilot hydraulic control system to solve the problem that current pilot hydraulic control oil passage is long in preheating time. The invention provides the pilot hydraulic control system which comprises a pilot control valve, a reversing valve, a first check valve, a second check valve, a first throttler and a second throttler. The first and second check valves are connected with the pilot control valve and the reversing valve through a pipeline. The first and second throttlers are connected in parallel between oil inlets and oil outlets of the first and second check valves to form left and right pipelines. A stagnancy relieving oil passage and an oil changing oil passage are arranged between the left and right pipelines. The stagnancy relieving oil passage comprises two hydraulic control check valves and the oil changing oil passage comprises an overflow valve connected between the left and right pipelines. Compared with the prior art, the pilot hydraulic control system provided by the invention has the advantages of fast start and impact and oil change prevention, the preheating efficiency can be improved and the preheating time can be reduced.

Description

technical field [0001] The invention relates to a hydraulic control system, in particular to a pilot hydraulic control system with the functions of changing oil, buffering and eliminating stagnation. Background technique [0002] For hydraulically driven equipment, the reversing valve is usually driven and controlled by the pilot control valve, and the action control of the hydraulic working equipment is realized through the action of the reversing valve. In order to reduce the hydraulic shock generated when the reversing valve is closed, the pilot control valve and A buffer device is connected between the reversing valves to slow down the resetting speed of the reversing valve and reduce the impact. The existing buffer device 20 includes a one-way valve and a restrictor connected in parallel with the one-way valve. Such as figure 1 As shown, port 1 on the pilot control valve is connected to the oil inlet port of the first one-way valve 21, the oil outlet port of the firs...

Claims

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Application Information

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IPC IPC(8): F15B13/02
Inventor 王中龙林明智李文新李欲江玉有恩
Owner LIUZHOU LIUGONG EXCAVATORS