Oil changing and buffering device and pilot hydraulic control system with same

Abstract

The invention relates to an oil changing and buffering device used in a pilot hydraulic control system, which solves the problems that the existing oil circuit requires a long preheating time and is slow to start, wherein two throttlers are connected in parallel between the oil inlet and oil outlet of a first one-way valve and the oil inlet and oil outlet of a second one-way valve respectively; the left control oil port of a three-position three-way reversing valve is communicated with the oil inlet A of the first one-way valve, the right control oil port is communicated with the oil inlet B of the second one-way valve, a left oil inlet a is communicated with the oil outlet C of the first one-way valve, the right oil inlet b is communicated with the oil outlet D of the second one-way valve, the oil outlets of the third one-way valve and the fourth one-way valve of an oil-changing oil circuit are correspondingly connected with the oil outlets of the first one-way valve and the second one-way valve, and the oil inlets thereof are oil-changing and intake port. The oil changing and buffering device used in the pilot hydraulic control system avoids the delay and stagnation of the starting action, causes no impact when stops, and at the same time can shorten the hydraulic oil preheating time in the pilot pipeline.

Description

technical field [0001] The invention relates to an oil change and buffer device, in particular to an oil change and buffer device used in a pilot hydraulic control system and a pilot hydraulic control system with the device. 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. like 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 ou...

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 slow action of the reversing valve due to the slow start of the reversing valve and the difficulty in preheating the hydraulic oil caused by the buffer device used on the existing pilot hydraulic control oil circuit. , and the oil change and buffer device that can shorten the preheating time of the pilot hydraulic oil and the pilot hydraulic control system with this device

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