CN-116928159-B - High-low pressure isolation type electrohydraulic steering engine and working method thereof

CN116928159BCN 116928159 BCN116928159 BCN 116928159BCN-116928159-B

Abstract

The invention relates to a high-low pressure isolation type electrohydraulic steering engine and a working method thereof, belongs to the technical field of hydraulic transmission, and solves the problems of instantaneous high-pressure damage to hydraulic elements and high cost of the electrohydraulic steering engine in the prior art. The hydraulic control system comprises a power unit, a pressure maintaining and oil supplementing unit, a mode loop, a protection loop, an isolation loop and an execution element which are connected with each other, wherein the execution element is used for driving a load, the isolation loop is used for isolating the high pressure and the low pressure of an electrohydraulic steering engine, the protection loop is used for ensuring that the execution element is not damaged when encountering abnormal high pressure, the mode selecting loop is used for selecting the working mode of the electrohydraulic steering engine, the pressure maintaining and oil supplementing unit is used for filtering, supplementing oil and protecting over pressure of an oil way, and the power unit is used for providing power for the electrohydraulic steering engine. The invention is provided with the isolation loop, avoids adverse effect of instantaneous high pressure on the electrohydraulic steering engine, and saves cost.

Inventors

ZHANG XUELEI
MA JUN
WEI HOUZHEN
YU DONGDONG
LIU CHAO
WANG KAI

Assignees

北京机械设备研究所

Dates

Publication Date: 20260508
Application Date: 20220331

Claims (7)

1. The high-low pressure isolation type electrohydraulic steering engine is characterized by comprising a power unit, a pressure maintaining and oil supplementing unit, a mode loop, a protection loop, an isolation loop and an execution element which are connected with each other, wherein the execution element is used for driving a load, the isolation loop is used for isolating high pressure and low pressure of the electrohydraulic steering engine, the protection loop is used for ensuring that the execution element is not damaged when encountering abnormal high pressure, the mode selection loop is used for selecting a working mode of the electrohydraulic steering engine, the pressure maintaining and oil supplementing unit is used for filtering an oil way, supplementing oil and protecting the oil way, the power unit is used for providing power for the electrohydraulic steering engine, the execution element comprises a single-rod hydraulic cylinder, the hydraulic cylinder is divided into a rod cavity and a rodless cavity, the isolation loop is communicated with the rod cavity and the rodless cavity, the isolation loop comprises a first cylinder safety valve, a second cylinder safety valve, a first locking valve and a second locking valve, the first cylinder safety valve and the second cylinder safety valve are connected between the oil way connected with the rod cavity and the rodless cavity in parallel, the first locking valve and the second locking valve are respectively connected with the oil way, the first locking valve and the second locking valve are connected with the rod cavity and the high pressure unloading cylinder safety valve respectively, and the second locking valve is connected with the rod safety valve and the high pressure oil cylinder safety valve.
2. The high and low pressure isolated electro-hydraulic steering engine of claim 1, wherein the actuator further comprises a position sensor for monitoring the position of a piston rod of the hydraulic cylinder.
3. The high-low pressure isolation type electrohydraulic steering engine of claim 1 wherein said protection circuit includes a first relief valve and a second relief valve disposed in parallel between oil passages connected from said rod and rodless chambers.
4. The high-low pressure isolated electro-hydraulic steering engine of claim 3, wherein the protection circuit further comprises a first pressure sensor and a second pressure sensor, the first pressure sensor and the second pressure sensor are respectively arranged on oil paths connected to the rodless cavity and the rod cavity.
5. The high and low pressure isolated electro-hydraulic steering engine of claim 1, wherein the mode selection circuit comprises a solenoid valve and is connected in parallel between oil passages connected from the rod and rodless chambers.
6. The high-low pressure isolation type electrohydraulic steering engine of claim 1 wherein said dwell and supplement unit includes a first check valve and a second check valve connected in series and then in parallel between the oil paths connecting from said rod and rodless chambers.
7. A method of operating a high and low pressure isolated electro-hydraulic steering engine according to any one of claims 1-6, comprising the steps of: step 1, connecting an executing element with a load; step2, the electromagnetic valve is electrified, and the motor is operated to drive the hydraulic pump to operate and turn to the rodless cavity to inject hydraulic oil to drive the load to apply work; Step 3, comparing the oil pressure in the hydraulic pipeline with the set pressure value of the overflow valve, overflowing the overflow valve if the oil pressure is greater than the set pressure of the overflow valve, performing pressure protection on the executing element, and executing the step 4 if the oil pressure is not greater than the set pressure of the overflow valve; and 4, judging the impact of the load end, and executing the steps 2-3 by the load when the load end has larger impact, wherein the electrohydraulic steering engine rotates in a pressure relief mode, and simultaneously, the isolation loop protects the whole electrohydraulic steering engine under instantaneous high pressure.

Description

High-low pressure isolation type electrohydraulic steering engine and working method thereof Technical Field The invention relates to the technical field of hydraulic transmission, in particular to a high-low pressure isolation type electrohydraulic steering engine and a working method thereof. Background With the development of the power electric transmission technology, the electrohydraulic steering engine is widely applied in the fields of aerospace and the like. When the load end of the electrohydraulic steering engine has larger impact, higher instantaneous pressure can be formed in a hydraulic pipeline of the electrohydraulic steering engine, and hydraulic elements in the electrohydraulic steering engine are damaged. There is currently no effective way to reduce or avoid the impact of transient high pressures on the system. In addition, the existing electrohydraulic steering engine adopts a mode of internally arranging an ultrahigh-pressure resistant element aiming at external high pressure, so that the cost is high. Disclosure of Invention In view of the above analysis, the embodiment of the invention aims to provide a high-low pressure isolation type electrohydraulic steering engine and a working method thereof, which are used for solving the problems of instantaneous high pressure damage to hydraulic elements and high cost of the existing electrohydraulic steering engine. On the one hand, the invention provides a high-low pressure isolation type electrohydraulic steering engine, which comprises a power unit, a pressure maintaining and oil supplementing unit, a mode loop, a protection loop, an isolation loop and an executing element which are connected with each other, wherein the executing element is used for driving a load, the isolation loop is used for isolating the high pressure and the low pressure of the electrohydraulic steering engine, the protection loop is used for ensuring that the executing element is not damaged when encountering abnormal high pressure, the mode selecting loop is used for selecting the working mode of the electrohydraulic steering engine, the pressure maintaining and oil supplementing unit is used for filtering, supplementing oil and protecting the oil path from overvoltage, and the power unit is used for providing power for the electrohydraulic steering engine. Further, the actuator comprises a single-rod hydraulic cylinder and a position sensor for monitoring the position of a piston rod of the hydraulic cylinder. Further, the hydraulic cylinder is divided into a rod cavity and a rodless cavity, and the isolation loop is communicated with the rod cavity and the rodless cavity. Further, the isolation loop comprises a first oil cylinder safety valve and a second oil cylinder safety valve which are connected in parallel between oil paths connected from the rod cavity and the rodless cavity. Further, the isolation loop further comprises a first blocking valve and a second blocking valve, and the first blocking valve and the second blocking valve are respectively arranged on the oil paths connected with the rodless cavity and the rod cavity. Further, the protection circuit comprises a first overflow valve and a second overflow valve, and the first overflow valve and the second overflow valve are connected in parallel between oil paths connected from the rod cavity and the rodless cavity. Further, the protection circuit further comprises a first pressure sensor and a second pressure sensor, and the first pressure sensor and the second pressure sensor are respectively arranged on the oil paths connected with the rodless cavity and the rod cavity. Further, the mode selection circuit includes a solenoid valve and is connected in parallel between oil passages connected from the rod chamber and the rodless chamber. Further, the pressure maintaining and oil supplementing unit comprises a first one-way valve and a second one-way valve, and the first one-way valve and the second one-way valve are connected in series and then connected in parallel between oil paths connected with the rod cavity and the rodless cavity. On the other hand, the invention provides a working method of the high-low pressure isolation type electrohydraulic steering engine, which comprises the following steps: step 1, connecting an executing element with a load; step2, the electromagnetic valve is electrified, and the motor is operated to drive the hydraulic pump to operate and turn to the rodless cavity to inject hydraulic oil to drive the load to apply work; Step 3, comparing the oil pressure in the hydraulic pipeline with the set pressure value of the overflow valve, overflowing the overflow valve if the oil pressure is greater than the set pressure of the overflow valve, performing pressure protection on the executing element, and executing the step 4 if the oil pressure is not greater than the set pressure of the overflow valve; and 4, judging the impact of the load end, and executing the steps 2-3 by