CN-116181745-B - Hydraulic system for protecting oil leakage, engineering machinery and oil leakage protection method

CN116181745BCN 116181745 BCN116181745 BCN 116181745BCN-116181745-B

Abstract

The invention discloses an oil leakage protection hydraulic system, engineering machinery and an oil leakage protection method, and relates to the technical field of hydraulic pressure, wherein the oil leakage protection hydraulic system comprises a main oil way, a hydraulic control system and a hydraulic control system, wherein the main oil way is provided with an oil inlet and an oil outlet, and a sequence valve and a pressure comparison on-off valve which are sequentially connected in series are arranged between the oil inlet and the oil outlet; the device comprises a speed regulating valve, a liquid storage delay device, a normally closed control end of a pressure comparison on-off valve, a normally open control end of the pressure comparison on-off valve and an oil demand device, wherein the oil inlet end of the speed regulating valve is connected between an oil inlet of a main oil way and a sequence valve, the oil inlet end of the liquid storage delay device is connected with an oil outlet end of the speed regulating valve, the oil outlet end of the liquid storage delay device is connected with an oil return tank, and the normally closed control end of the pressure comparison on-off valve is connected with the oil inlet end of the liquid storage delay device. In the specific use process of the oil leakage protection hydraulic system, when oil leakage occurs in the oil requiring device, the pressure comparison on-off valve can be controlled to be switched to the off position in time, the oil supply for the oil requiring device is stopped, and the working oil pump is prevented from being damaged due to oil shortage.

Inventors

ZHANG DAQING
TANG ZHONGYONG
ZHAO YUMING
REN CHENBO
WU MINWANG
ZHANG DAPENG

Assignees

山河智能特种装备有限公司

Dates

Publication Date: 20260505
Application Date: 20230307

Claims (4)

1. An oil leakage protection hydraulic system, comprising: The main oil way is provided with an oil inlet used for being connected with an oil source and an oil outlet used for being connected with an oil requiring device, and a sequence valve (2) and a pressure comparison on-off valve (3) which are sequentially connected in series are arranged between the oil inlet and the oil outlet; The oil inlet end of the speed regulating valve (1) is connected between the oil inlet of the main oil way and the sequence valve (2); The oil inlet end of the liquid storage delay device (4) is connected with the oil outlet end of the speed regulating valve (1), and the oil outlet end of the liquid storage delay device (4) is connected with an oil return tank; The normally closed control end of the pressure comparison on-off valve (3) is connected with the oil inlet end of the liquid storage delay device (4), the normally open control end of the pressure comparison on-off valve (3) is connected with the oil inlet end of the oil demand device, when the acting force of the normally open control end is larger than that of the normally open control end, the pressure comparison on-off valve (3) is switched to an off position to stop oil supply for the oil demand device, and when the acting force of the normally closed control end is smaller than that of the normally open control end, the pressure comparison on-off valve (3) is switched to the normally open position to supply oil for the oil demand device; The minimum set flow of the speed regulating valve (1) is smaller than or equal to the flow of the oil inlet of the main oil way; A first reset spring is arranged in the pressure comparison on-off valve (3), a second reset spring is arranged in the liquid storage delay device (4), the opening pressure of the sequence valve (2) is larger than the second elastic pressure of the second reset spring, and the second elastic pressure of the second reset spring is smaller than the first elastic pressure of the first reset spring; The minimum set flow of the speed regulating valve (1) is smaller than or equal to the flow of an oil inlet of the main oil way, the opening pressure of the sequence valve (2) is P1, the compensation pressure difference of the speed regulating valve (1) is DeltaP, the first elastic pressure of a first reset spring in the pressure comparison on-off valve (3) is P0, P1 is larger than or equal to DeltaP, P1 is larger than or equal to P0, and the second elastic pressure P2 of the second reset spring is smaller than the first elastic pressure P0 of the first reset spring.
2. The oil leakage protection hydraulic system according to claim 1, characterized in that the first active area of the normally open control end of the pressure comparison on-off valve (3) is larger than the second active area of the normally closed control end.
3. A construction machine comprising an oil leakage protection hydraulic system according to any one of claims 1-2.
4. A method of oil leakage protection applied to the oil leakage protection hydraulic system of any one of the preceding claims 1-2, the method comprising: Judging whether the pressure of the normally-open control end of the pressure comparison on-off valve (3) is larger than the pressure of the normally-closed control end of the pressure comparison on-off valve (3), if so, controlling the pressure comparison on-off valve (3) to be maintained at a normally-open position, and supplying oil to the oil-requiring device; If not, the pressure comparison on-off valve (3) is controlled to be switched to the off position, and oil supply to the oil demand device is stopped.

Description

Hydraulic system for protecting oil leakage, engineering machinery and oil leakage protection method Technical Field The invention relates to the technical field of hydraulic pressure, in particular to an oil leakage protection hydraulic system. In addition, the invention also relates to engineering machinery comprising the oil leakage protection hydraulic system and an oil leakage protection method. Background In the prior art, in order to solve the problem of dangerous working environment construction, many devices now adopt the mode of beyond visual range remote control operation, because operating personnel can not operate engineering machinery in situ, only through video image perception operation, often because of visual field and environment are poor in presence feel and the equipment scrapes and bumps and lead to exposing oil pipe to break oil leak or oil spout, operating personnel can not perceive timely shut down to this, if oil leak time is longer then equipment hydraulic system damages the working oil pump because of lacking oil, causes irrecoverable economic loss for the user, the fluid pollution soil that spills simultaneously, destroy the environment etc.. In summary, how to provide an oil leakage protection hydraulic system capable of timely protecting oil leakage when the oil leakage is broken is a problem to be solved by those skilled in the art. Disclosure of Invention Therefore, the invention aims to provide an oil leakage protection hydraulic system, when oil leakage occurs in an oil requiring device, the pressure of the normally-on control end of the pressure comparison on-off valve is reduced to be smaller than that of the normally-off control end, the pressure comparison on-off valve is switched to the off position, and oil supply to the oil requiring device is stopped in time, so that the working oil pump is prevented from being damaged due to oil shortage. Another object of the present invention is to provide a construction machine comprising the above oil leakage protection hydraulic system and an oil leakage protection method applied to the oil leakage protection hydraulic system. In order to achieve the above object, the present invention provides the following technical solutions: an oil leakage protection hydraulic system comprising: the main oil way is provided with an oil inlet used for being connected with an oil source and an oil outlet used for being connected with an oil requiring device, and a sequence valve and a pressure comparison on-off valve which are sequentially connected in series are arranged between the oil inlet and the oil outlet; The oil inlet end of the speed regulating valve is connected between the oil inlet of the main oil way and the sequence valve; The oil inlet end of the liquid storage delay device is connected with the oil outlet end of the speed regulating valve, and the oil outlet end of the liquid storage delay device is connected with an oil return oil tank; The normally closed control end of the pressure comparison on-off valve is connected to the oil inlet end of the liquid storage delay device, the normally open control end of the pressure comparison on-off valve is connected to the oil inlet end of the oil demand device, when the acting force of the normally closed control end is larger than the acting force of the normally open control end, the pressure comparison on-off valve is switched to an off position to stop oil supply for the oil demand device, and when the acting force of the normally closed control end is smaller than the acting force of the normally open control end, the pressure comparison on-off valve is switched to the normally open position to supply oil for the oil demand device. Optionally, the first acting area of the normally-open control end of the pressure comparison on-off valve is larger than the second acting area of the normally-closed control end. Optionally, the minimum set flow of the speed regulating valve is smaller than or equal to the flow of the oil inlet of the main oil way. Optionally, a first return spring is arranged in the pressure comparison on-off valve. Optionally, a second reset spring is arranged in the liquid storage delay device, the opening pressure of the sequence valve is larger than the second elastic pressure of the second reset spring, and the second elastic pressure of the second reset spring is smaller than the first elastic pressure of the first reset spring. A construction machine comprising an oil leakage protection hydraulic system according to any one of the preceding claims. An oil leakage protection method applied to the oil leakage protection hydraulic system described in any one of the above, the oil leakage protection method comprising: Judging whether the acting force of the normally-open control end of the pressure comparison on-off valve is larger than the acting force of the normally-closed control end of the pressure comparison on-off valve, if so, controlling the pressure