CN114412886A

CN114412886A - Hydraulic actuator valve bank, test hydraulic system and valve bank test method

Info

Publication number: CN114412886A
Application number: CN202210095575.0A
Authority: CN
Inventors: 汪立平; 姜鹏; 刘仕元; 雷政; 郭言; 姚蕊; 孙炳玉; 李辉
Original assignee: National Astronomical Observatories of CAS; Jiangsu Hengli Hydraulic Technology Co Ltd
Current assignee: National Astronomical Observatories of CAS; Jiangsu Hengli Hydraulic Technology Co Ltd
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2022-04-29

Abstract

The invention relates to the technical field of hydraulic actuators, in particular to a hydraulic actuator valve group, which is applied to a FAST hydraulic actuator and comprises the following components: the oil supply port, the oil pump B cavity interface, the oil pump A cavity interface, the oil return port, the first reversing unit, the pressure maintaining unit and the opening unit. The invention also provides a test hydraulic system, which comprises a hydraulic actuator valve group and further comprises: the test hydraulic system disclosed by the invention has the advantages that the oil passes through the hydraulic actuator valve bank, so that the test hydraulic system can be controlled to carry out items such as valve bank flushing, valve bank set pressure confirmation, oil way pressure maintaining test, leakage test, valve bank function confirmation and the like on the hydraulic actuator valve bank, and the test hydraulic system is controlled to carry out various tests on the FAST hydraulic actuator valve bank, so that the test efficiency can be improved.

Description

Hydraulic actuator valve bank, test hydraulic system and valve bank test method

Technical Field

The invention relates to the technical field of hydraulic actuators, in particular to a FAST hydraulic actuator valve bank, a test hydraulic system and a valve bank test method.

Background

At present, an actuator is a driving device for deformation of an active reflecting surface of an FAST telescope, is a rare local large-scale equipment group in the world, and needs to be replaced periodically in batches for system maintenance due to high failure rate and difficult field maintenance operation. The actuator control valve group is a key control component of the FAST actuator, and has the characteristics of small volume, complex structure, multiple hydraulic channels, high integration level, various types of hydraulic elements and the like, functions of all the hydraulic elements are adjusted and confirmed in the maintenance process, the valve group flushing, the confirmation of set pressure of the valve group, the oil cylinder rod cavity oil circuit pressure maintaining test, the oil pump A cavity oil circuit pressure maintaining test, the oil pump B cavity oil circuit pressure maintaining test, the valve group leakage test, the confirmation of the valve group function, the confirmation of the pressure sensor function and other test items are completed, the flow is complex, the channels are numerous, and the switching is frequent in the test process.

After the existing FAST actuator valve group fails, troubleshooting and regular maintenance cannot be performed, and instead, scrapping treatment and replacement of a new product are directly performed. This operation causes unnecessary waste and increases maintenance costs.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: a hydraulic actuator valve group is applied to a FAST hydraulic actuator, the hydraulic actuator valve group is connected with an oil cylinder to control the action of a piston rod of the oil cylinder, the oil cylinder comprises a rodless cavity and a rod cavity, and the hydraulic actuator valve group comprises: the oil supplementing port is communicated with the oil pump B cavity interface through a first oil path, and the oil supplementing port is communicated with the oil pump A cavity interface through a second oil path;

the input end of the pressure maintaining unit is communicated with a rod cavity of the oil cylinder, and the output end of the pressure maintaining unit is communicated with the first oil way;

the output end of the first reversing unit is communicated with the input end of the pressure maintaining unit, and the input end of the first reversing unit is communicated with the rodless cavity of the oil cylinder;

the input end of the opening unit is communicated with the second oil path, the output end of the opening unit is communicated with a rodless cavity of the oil cylinder, and the input end of the opening unit is connected with the pressure maintaining unit to open the pressure maintaining unit;

a first throttling unit is arranged between a rodless cavity of the oil cylinder and the oil return port, the input end of the first throttling unit is communicated with the rodless cavity of the oil cylinder, and the output end of the first throttling unit is communicated with the oil return port.

The hydraulic actuator valve group can control the action of a piston rod of an oil cylinder, and performs multi-stage pressure regulation on an actuator hydraulic loop through the actuator valve group, so that the piston rod of the oil cylinder can be controlled to have several actions of differential extension, static position retention, passive extension, active retraction and follow-up extension; when the follow-up extends out, the piston rod can stay at any position under the action of the load pulling force.

Further, the input of pressurize unit with be linked together through the third oil circuit between the first throttling unit, be provided with first safety protection unit on the third oil circuit, the input of first safety protection unit with the input of pressurize unit is linked together, the output of first safety protection unit with the input of first throttling unit is linked together, first safety protection unit is used for right the input port pressure release of pressurize unit plays the safety protection effect in order to the oil circuit. When the pressure maintaining unit fails and cannot be normally opened or the oil pressure of an oil circuit at the input end of the pressure maintaining unit is too high, the oil circuit is decompressed through the first safety protection unit, and therefore the safety protection effect is achieved on the whole actuator oil circuit.

Further, the output end of the pressure maintaining unit is communicated with the output end of the first safety protection unit through a fourth oil path, and a second safety protection unit is arranged on the fourth oil path. When fluid passes through the output of mend the oil mouth and inputs the pressurize unit, if the unable normal opening of pressurize unit trouble, the oil pressure of the output of pressurize unit can be higher, carries out the pressure release to the oil circuit through opening second safety protection unit to prevent that the oil circuit oil pressure is too high, thereby carry out safety protection to the oil circuit jointly through second safety protection unit and first safety protection unit.

Furthermore, one side of the first reversing unit is provided with an adjustable unit in parallel, the input end of the adjustable unit is communicated with the output end of the pressure maintaining unit, the output end of the adjustable unit is communicated with the rodless cavity of the oil cylinder, and the adjustable unit can be manually or automatically opened to enable oil liquid at the input end and the output end of the first reversing unit to circulate through the adjustable unit. When the first reversing unit fails and cannot be normally opened or the first reversing unit is opened, the adjustable unit is manually or automatically controlled to enable oil at two ends of the first reversing unit to circulate, the adjustable unit can play a fault emergency role, so that the oil in the actuator normally circulates, and the actuator can normally control the action of the oil cylinder piston rod.

Furthermore, a first check valve is arranged on the first oil way, an input port of the first check valve is communicated with the oil supplementing port, and an output port of the first check valve is communicated with a cavity B interface of the oil pump.

And furthermore, a second one-way valve is arranged on the second oil way, an input port of the second one-way valve is communicated with the oil supplementing port, and an output port of the second one-way valve is communicated with the interface of the cavity A of the oil pump.

Further, the inside oil path that communicates the hydro-cylinder has the pole chamber and pressurize the unit input is provided with first pressure sensor, first pressure sensor has the pole chamber to the hydro-cylinder and the pressure of the input section of pressurize unit detects.

Further, a second pressure sensor is arranged on the first oil way and used for detecting the pressure at the interface of the cavity B of the oil pump.

Further, a third pressure sensor is arranged on the second oil path, and the third pressure sensor detects the pressure at the interface of the cavity A of the oil pump.

Furthermore, the first reversing unit comprises a first electromagnetic reversing valve, an input port of the first electromagnetic reversing valve is communicated with the rodless cavity of the oil cylinder, and an output port of the first electromagnetic reversing valve is communicated with an input end of the pressure maintaining unit.

Further, the opening unit comprises a first overflow valve, an input port of the first overflow valve is communicated with the second oil path, and an output port of the first overflow valve is communicated with the rodless cavity of the oil cylinder.

Further, the pressure maintaining unit comprises a balance valve, an input port of the balance valve is communicated with a rod cavity of the oil cylinder, and an output end of the first reversing unit is communicated with an input port of the balance valve.

Further, the first safety protection unit is a second overflow valve, and the second safety protection unit is a third overflow valve.

Furthermore, the adjustable unit is an adjustable throttle valve, and when the first reversing unit breaks down, the adjustable throttle valve is manually or automatically opened to enable oil to circulate.

Furthermore, a second throttling unit is arranged between the pressure maintaining unit and the first reversing unit, an input port of the second throttling unit is communicated with an input end of the pressure maintaining unit, and an output end of the second throttling unit is communicated with an output end of the first reversing unit.

Further, the first throttling unit is a first throttling valve, and the second throttling unit is a second throttling valve.

The invention also provides a test hydraulic system, which comprises the hydraulic actuator valve group and further comprises:

an oil tank;

the input port of the constant delivery pump is connected with the oil tank;

the input end of the second reversing unit is communicated with the output port of the constant delivery pump, and the output end of the second reversing unit is communicated with the oil tank;

the third reversing unit is connected with the second reversing unit in parallel, the input end of the third reversing unit is communicated with the output port of the constant delivery pump, and the output end of the third reversing unit is communicated with the oil tank;

the input end of the overflow unit is communicated with the output port of the constant delivery pump, and the output end of the overflow unit is communicated with the oil tank;

the testing connection unit I is communicated with a rodless cavity of the oil cylinder, the testing connection unit II is communicated with a rod cavity of the oil cylinder, the testing connection unit III is communicated with a cavity interface of an oil pump B, the testing connection unit IV is communicated with a cavity interface of the oil pump A, the testing connection unit V is communicated with an oil supplementing port, and the testing connection unit VI is communicated with an oil return port;

and a branch oil path is arranged on an oil path for communicating the delivery outlet of the dosing pump with the second reversing unit, and the first test connection unit, the second test connection unit, the third test connection unit, the fourth test connection unit and the fifth test connection unit are arranged at one end of the branch oil path in parallel and are communicated with the branch oil path.

According to the test hydraulic system, the metering pump in the test hydraulic system is used for enabling oil liquid in the oil tank to pass through the hydraulic actuator valve bank, so that valve bank flushing, valve bank set pressure confirmation, oil cylinder rod cavity oil line pressure maintaining test, oil pump A cavity oil line pressure maintaining test, oil pump B cavity oil line pressure maintaining test, valve bank leakage test, valve bank function confirmation and pressure sensor function confirmation test items can be carried out by controlling the hydraulic actuator valve bank in the test hydraulic system, and test efficiency can be improved by controlling the test hydraulic system to carry out various tests on the hydraulic actuator valve bank.

Furthermore, the first test connection unit, the second test connection unit, the third test connection unit, the fourth test connection unit and the fifth test connection unit all comprise a second electromagnetic directional valve and a fourth pressure sensor, an input port of the second electromagnetic directional valve is communicated with the branch oil path, and the fourth pressure sensor is arranged at one end of an output port of the second electromagnetic directional valve.

Further, the second reversing unit comprises a third electromagnetic reversing valve and a fourth overflow valve, an input port of the third electromagnetic reversing valve is communicated with an output port of the constant delivery pump, an output port of the third electromagnetic reversing valve is communicated with an input port of the fourth overflow valve, and an output port of the fourth overflow valve is communicated with the oil tank.

Furthermore, the third reversing unit comprises a fourth electromagnetic reversing valve, an input port of the fourth electromagnetic reversing valve is communicated with an output port of the constant delivery pump, and an output port of the fourth electromagnetic reversing valve is communicated with the oil tank.

Further, the overflow unit comprises a fifth overflow valve, an input port of the fifth overflow valve is communicated with an output port of the constant delivery pump, and an output port of the fifth overflow valve is communicated with the oil tank.

Further, a flow control unit is arranged on the branch oil path, and the flow control unit adjusts and controls the flow in the branch oil path.

Further, flow control unit includes needle valve and flow sensor, the input port of needle valve is linked together with the delivery outlet of constant delivery pump, flow sensor sets up the one end at the delivery outlet of needle valve. Through the opening size of adjustment needle valve, the flow of the fluid that the adjustment flows through, then detect flow through flow sensor for the data when revealing the test to hydraulic actuator valves are more accurate.

Furthermore, a pressure gauge is arranged on an oil path for communicating the output port of the constant delivery pump with the second reversing unit, and the pressure gauge is used for observing the pressure of the oil output by the constant delivery pump.

Further, still include fluid temperature control system, fluid temperature control system links to each other with the oil tank is inside in order to carry out temperature control to the inside fluid of oil tank.

Further, the oil temperature control system includes: oil tank temperature sensor, heater, air cooler and controller, oil tank temperature sensor sets up and detects the temperature of fluid in the oil tank, the heater sets up inside the oil tank, the air cooler sets up one side of oil tank is in order to carry out the temperature cooling to the oil tank, oil tank temperature sensor, heater and air cooler all with the controller electricity is connected. The fluid temperature control system during operation, oil tank temperature sensor detects the temperature of oil tank to give the controller on the data that will detect, when the oil tank temperature was crossed low, the controller controlled heater heated the fluid in the oil tank and heaied up, when oil tank temperature sensor detected the oil tank temperature and was too high, the controller controlled forced air cooler cooled down fluid, thereby effectively maintained the fluid in the oil tank in the fluid temperature range of settlement.

The invention also provides a valve group testing method, which adopts the testing hydraulic system and comprises the following steps:

s1, performing a flushing test, controlling oil at the output port of the constant delivery pump, controlling the oil to enter a hydraulic actuator valve block from an oil supplementing port and an oil pump cavity B interface to perform a flushing test on a valve block hydraulic valve element, and resetting a loop after flushing;

s2, confirming the pressure of a hydraulic valve element of the hydraulic actuator valve group, controlling oil output by the fixed displacement pump to enter the hydraulic actuator valve group from an oil pump A cavity interface, an oil cylinder rod cavity and an oil pump B cavity interface, confirming the pressure of the valve group hydraulic valve element through a fourth pressure sensor in a test connection unit IV, a test connection unit II and a test connection unit III, and resetting a loop after the confirmation is finished;

s3, oil path pressure maintaining test, wherein oil output by the constant delivery pump is controlled to enter a hydraulic actuator valve group from an oil cylinder rod cavity, an oil pump A cavity interface and an oil pump B cavity interface, the oil paths of the oil cylinder rod cavity, the oil pump A cavity and the oil pump B cavity are subjected to pressure maintaining test by detecting or reading the value of a flow sensor, and a return circuit is reset after the completion of the test;

s4, leakage test, wherein oil output by the constant delivery pump is controlled to enter the hydraulic actuator valve group from the rodless cavity of the oil cylinder, the leakage test is carried out on the adjustable unit by detecting or reading the value of the flow sensor, and the return circuit is reset after the completion of the detection;

and S5, performing function test on the first reversing unit, controlling the oil output by the constant delivery pump to enter the hydraulic actuator valve group from the rod cavity of the oil cylinder, switching the first reversing unit from an open state to a closed state, switching the first reversing unit to the open state, performing function test on the first reversing unit by detecting or reading whether the numerical value of the flow sensor changes from small to large and then changes from small to small, and resetting the loop after the confirmation is finished.

Further, step S1 includes:

s11, closing the second reversing unit and the third reversing unit, opening the first testing connecting unit, enabling oil output by the constant delivery pump to enter the oil supplementing port through the first testing connecting unit, performing flushing test on the pressure maintaining unit, the adjustable unit, the opening unit and the first throttling unit in the hydraulic actuator valve bank, and resetting the loop after flushing;

and S12, closing the third reversing unit, opening the third testing connection unit, enabling oil output by the constant delivery pump to enter an oil pump B cavity interface through the third testing connection unit, performing flushing test on the second safety protection unit and the first throttling unit in the hydraulic actuator valve group, and resetting the loop after flushing.

Further, step S2 includes:

s21, the second reversing unit and the third reversing unit are closed, the testing connection unit IV is opened, oil output by the constant delivery pump enters the cavity A interface of the oil pump through the testing connection unit IV, the set pressure of the opening unit is detected through a fourth pressure sensor in the testing connection unit IV, and the loop is reset after the completion of the detection;

s22, closing the first safety protection unit, closing the third reversing unit at the same time, opening the second testing connection unit, enabling oil output by the constant delivery pump to enter a rod cavity of the oil cylinder through the second testing connection unit, detecting the set pressure of the pressure maintaining unit through a fourth pressure sensor in the second testing connection unit, and resetting the loop after the completion of the detection;

s23, closing the third reversing unit, opening the second testing connection unit, enabling oil output by the fixed displacement pump to enter the rod cavity of the oil cylinder through the second testing connection unit, detecting the set pressure of the first safety protection unit through a fourth pressure sensor in the second testing connection unit, and resetting the loop after the completion of the detection;

and S24, closing the adjustable unit, closing the second reversing unit and the third reversing unit at the same time, opening the third testing connection unit, enabling oil output by the constant delivery pump to enter an oil pump B cavity interface through the third testing connection unit, detecting the set pressure of the second safety protection unit through a fourth pressure sensor in the third testing connection unit, observing the value of the second pressure sensor at the same time, and resetting the loop after the completion of the confirmation.

Further, step S3 includes:

s31, closing the adjustable unit, closing the second reversing unit and the third reversing unit at the same time, opening the second testing connection unit, enabling oil output by the constant delivery pump to enter the rod cavity of the oil cylinder through the second testing connection unit, performing pressure maintaining test on the rod cavity of the oil cylinder by detecting or reading the value of the flow sensor, and resetting the loop after the completion of the test;

s32, closing the adjustable unit, closing the second reversing unit and the third reversing unit at the same time, opening the testing connection unit IV, enabling oil output by the constant delivery pump to enter an interface of the cavity A of the oil pump through the testing connection unit IV, performing pressure maintaining test on the cavity A of the oil pump through detecting or reading the value of the flow sensor, and resetting the loop after the completion of the test;

and S33, closing the adjustable unit, closing the second reversing unit and the third reversing unit at the same time, opening the third testing connection unit, enabling oil output by the constant delivery pump to enter an interface of the cavity B of the oil pump through the third testing connection unit, performing pressure maintaining test on the cavity B of the oil pump through detecting or reading the value of the flow sensor, and resetting the loop after the completion of the test.

The hydraulic actuator valve group has the advantages that the hydraulic actuator valve group can control the action of a piston rod of an oil cylinder, and multi-stage pressure regulation is carried out on an actuator hydraulic circuit through the actuator valve group, so that the piston rod of the oil cylinder can be controlled to have several actions of differential extension, static position retention, passive extension, active retraction and follow-up extension; when the follow-up extends out, the piston rod can stay at any position under the action of the load pulling force.

The invention relates to a test hydraulic system, which passes oil liquid in an oil tank into a hydraulic actuator valve bank through a constant delivery pump in the test system, thereby performing valve bank flushing, valve bank set pressure confirmation, oil cylinder rod cavity oil line pressure maintaining test, oil pump A cavity oil line pressure maintaining test, oil pump B cavity oil line pressure maintaining test, valve bank leakage test, valve bank function confirmation and pressure sensor function confirmation test items on the hydraulic actuator valve bank through controlling the test hydraulic system, and the oil liquid in the oil tank is introduced into the hydraulic actuator valve bank through the constant delivery pump, then the action of an oil cylinder piston rod is controlled through the hydraulic actuator valve bank, the test hydraulic system can be used for periodically testing and troubleshooting a hydraulic actuator valve, and after the test hydraulic system is installed at one time, the test and troubleshooting are performed on the hydraulic actuator valve periodically, the hydraulic actuator valve group testing device has the advantages that the hydraulic actuator valve group testing device does not need to be detached and reinstalled, is convenient to use, is convenient to test and troubleshoot the hydraulic actuator valve group, and can improve the testing efficiency by controlling the hydraulic actuator valve group to be tested in multiple modes.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic view of a hydraulic actuator valve block of the present invention.

Fig. 2 is a schematic diagram of a portion of the test hydraulic system of the present invention.

Fig. 3 is a schematic diagram of the structure of the test hydraulic system of the present invention.

Fig. 4 is a flow chart of a valve group testing method of the present invention.

Fig. 5 is a flowchart illustrating step S1 in the valve set testing method according to the present invention.

Fig. 6 is a flowchart illustrating step S2 in the valve set testing method according to the present invention.

Fig. 7 is a flowchart illustrating step S3 in the valve group testing method according to the present invention.

In the figure: 1. an oil cylinder; 2. a rodless cavity; 3. a rod cavity; 4. an oil supplementing port; 5. an oil pump B cavity interface; 6. An oil pump A cavity interface; 7. an oil return port; 8. a first commutation cell; 9. a pressure maintaining unit; 10. a starting unit; 11. a first oil passage; 12. a second oil passage; 13. a first throttling unit; 14. a third oil passage; 15. a first safety protection unit; 16. a second safety protection unit; 17. an adjustable unit; 18. a first check valve; 19. A second one-way valve; 20. a first pressure sensor; 21. a second pressure sensor; 22. a third pressure sensor; 23. a second throttling unit; 24. an oil tank; 25. a constant delivery pump; 26. a second commutation cell; 27. a third commutation cell; 28. an overflow unit; 29. testing the first connecting unit; 30. a second test connection unit; 31. a third test connection unit; 32. testing the connection unit IV; 33. testing the connecting unit V; 34. a test connection unit six; 35. a branch oil path; 36. a third electromagnetic directional valve; 37. a fourth spill valve; 38. a flow control unit; 39. a needle valve; 40. a flow sensor; 41. a pressure gauge; 42. an oil temperature control system; 43. A tank temperature sensor; 44. a heater; 45. a wind cooler; 46. a liquid level relay; 47. air filtering; 48. a motor; 49. a high pressure filter; 50. and a third one-way valve.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

As shown in fig. 1, a hydraulic actuator valve assembly, which is applied in a FAST hydraulic actuator, is connected to a cylinder 1 to control the motion of a piston rod of the cylinder 1, the cylinder 1 includes a rod-less cavity 2 and a rod cavity 3, and the hydraulic actuator valve assembly includes: the oil supplementing port 4 is communicated with the oil pump B cavity interface 5 through a first oil path 11, and the oil supplementing port 4 is communicated with the oil pump A cavity interface 6 through a second oil path 12; the input end of the pressure maintaining unit 9 is communicated with the rod cavity 3 of the oil cylinder 1, and the output end of the pressure maintaining unit 9 is communicated with the first oil way 11.

The output end of the first reversing unit 8 is communicated with the input end of the pressure maintaining unit 9, and the input end of the first reversing unit 8 is communicated with the rodless cavity 2 of the oil cylinder 1; the input end of the opening unit 10 is communicated with the second oil path 12, the output end of the opening unit 10 is communicated with the rodless cavity 2 of the oil cylinder 1, the input end of the opening unit 10 is connected with the pressure maintaining unit 9 to open the pressure maintaining unit 9, a first throttling unit 13 is arranged between the rodless cavity 2 of the oil cylinder 1 and the oil return opening 7, the input end of the first throttling unit 13 is communicated with the rodless cavity 2 of the oil cylinder 1, and the output end of the first throttling unit 13 is communicated with the oil return opening 7. The first throttle unit 13 is a first throttle valve.

The hydraulic actuator valve group can control the action of a piston rod of an oil cylinder 1, and multi-stage pressure regulation is carried out on an actuator hydraulic loop through the actuator valve group, so that the piston rod of the oil cylinder 1 can be controlled to have several actions of differential extension, static position keeping, passive extension, active retraction and follow-up extension; when the follow-up extends out, the piston rod can stay at any position under the action of the load pulling force.

The input end of the pressure maintaining unit 9 is communicated with the first throttling unit 13 through a third oil path 14, a first safety protection unit 15 is arranged on the third oil path 14, the input end of the first safety protection unit 15 is communicated with the input end of the pressure maintaining unit 9, the output end of the first safety protection unit 15 is communicated with the input end of the first throttling unit 13, and the first safety protection unit 15 is used for relieving pressure of an input port of the pressure maintaining unit 9 so as to play a safety protection role in the oil path. When the pressure maintaining unit 9 fails and cannot be normally opened or the oil pressure of an oil circuit at the input end of the pressure maintaining unit 9 is too high, the oil circuit is decompressed through the first safety protection unit 15, and therefore the safety protection effect is achieved on the whole actuator oil circuit.

The output end of the pressure maintaining unit 9 is communicated with the output end of the first safety protection unit 15 through a fourth oil path, and a second safety protection unit 16 is arranged on the fourth oil path. When fluid passes through the output that mends hydraulic fluid mouth 4 input to pressurize unit 9, if pressurize unit 9 trouble can't normally be opened, the oil pressure of the output of pressurize unit 9 can be higher, carries out the pressure release to the oil circuit through opening second safety protection unit 16 to prevent that the oil circuit oil pressure is too high, thereby carry out safety protection to the oil circuit jointly through second safety protection unit 16 and first safety protection unit 15.

One side of the first reversing unit 8 is provided with an adjustable unit 17 in parallel, the input end of the adjustable unit 17 is communicated with the output end of the pressure maintaining unit 9, the output end of the adjustable unit 17 is communicated with the rodless cavity 2 of the oil cylinder 1, and the adjustable unit 17 can be manually or automatically opened to enable oil liquid at the input end and the output end of the first reversing unit 8 to flow through the adjustable unit 17. When the first reversing unit 8 fails and cannot be normally started or the first reversing unit 8 fails, the adjustable unit 17 is manually or automatically controlled to be started, so that oil at two ends of the first reversing unit 8 circulates, the adjustable unit 17 can play a fault emergency role, oil in the actuator normally circulates, and the actuator can normally control the action of the piston rod of the oil cylinder 1.

The first oil path 11 is provided with a first one-way valve 18, an input port of the first one-way valve 18 is communicated with the oil supplementing port 4, an output port of the first one-way valve 18 is communicated with the cavity B interface 5 of the oil pump, the second oil path 12 is provided with a second one-way valve 19, an input port of the second one-way valve 19 is communicated with the oil supplementing port 4, and an output port of the second one-way valve 19 is communicated with the cavity A interface 6 of the oil pump.

The inside oil circuit that intercommunication hydro-cylinder 1 has pole chamber 3 and pressurize unit 9 input is provided with first pressure sensor 20, first pressure sensor 20 has the pressure of the input section of pole chamber 3 and pressurize unit 9 to hydro-cylinder 1 to detect, be provided with second pressure sensor 21 on the first oil circuit 11, second pressure sensor 21 detects the pressure of oil pump B chamber interface 5 department, be provided with third pressure sensor 22 on the second oil circuit 12, third pressure sensor 22 detects the pressure of oil pump A chamber interface 6 department.

The first reversing unit 8 comprises a first electromagnetic reversing valve, the first electromagnetic reversing valve is a normally closed electromagnetic reversing valve, an input port of the first electromagnetic reversing valve is communicated with the rodless cavity 2 of the oil cylinder 1, and an output port of the first electromagnetic reversing valve is communicated with an input end of the pressure maintaining unit 9. The pressure maintaining unit 9 comprises a balance valve, an input port of the balance valve is communicated with the rod cavity 3 of the oil cylinder 1, and an output end of the first reversing unit 8 is communicated with an input port of the balance valve. The opening unit 10 comprises a first overflow valve, an input port of the first overflow valve is communicated with the second oil path 12, and an output port of the first overflow valve is communicated with the rodless cavity 2 of the oil cylinder 1. The first safety protection unit 15 is a second overflow valve, and the second safety protection unit 16 is a third overflow valve. The adjustable unit 17 is an adjustable throttle valve which is opened manually or automatically to circulate the oil in the event of a failure of the first commutation unit 8.

A second throttling unit 23 is arranged between the pressure maintaining unit 9 and the first reversing unit 8, an input port of the second throttling unit 23 is communicated with an input end of the pressure maintaining unit 9, and an output end of the second throttling unit 23 is communicated with an output end of the first reversing unit 8. The second throttle unit 23 is a second throttle valve.

The working principle is as follows: referring to fig. 1, when the differential motion is extended, the first electromagnetic directional valve is in an electrified and opened state, oil in the rod cavity 3 and the rodless cavity 2 of the oil cylinder 1 can flow through the first electromagnetic directional valve, the oil is introduced into the hydraulic actuator valve group through the oil supplementing port 4, flows into the oil pump a cavity interface 6 from the oil supplementing port 4 and then flows into the second check valve 19, under the action of the oil pump, the oil flows out from a cavity interface 5 of an oil pump B of the oil pump, then enters a balance valve, a part of oil flows to a first electromagnetic directional valve from the balance valve, then flows into a rodless cavity 2 of the oil cylinder 1 through a first electromagnetic directional valve, the other part of oil flows into a rod cavity 3 of the oil cylinder 1 from a balance valve, because the pressure action area of the oil to the piston in the rodless cavity 2 is larger than the action area of the oil to the piston in the rod cavity 3, the piston rod of the oil cylinder 1 can slowly extend out.

When the oil cylinder extends passively, when the actuator extends under the action of load tension, the first electromagnetic directional valve is in a closed state, oil in the rod cavity 3 of the oil cylinder 1 enters the balance valve through an internal oil way, the oil introduced from the oil supplementing port 4 flows to the first one-way valve 18, enters the interface 5 of the oil pump B cavity after passing through the first one-way valve 18 and is then discharged from the interface 6 of the oil pump A cavity, when the pressure reaches the setting value of the first overflow valve, the balance valve is opened, the oil in the rodless cavity 2 flows out of the balance valve under the action of the load tension and enters the interface 5 of the oil pump B cavity, then is discharged through the interface 6 of the oil pump A cavity, then enters the rodless cavity 2 of the oil cylinder 1 through the first overflow valve, and then pushes the piston to move after the oil enters the rodless cavity 2 of the oil cylinder 1, so that the piston rod of the oil cylinder 1 extends.

When the oil cylinder is in a static state, the balance valve and the first electromagnetic directional valve are closed, oil in the rod cavity 3 and the rodless cavity 2 of the oil cylinder 1 cannot pass through the balance valve and the first electromagnetic directional valve, and a piston rod of the oil cylinder 1 does not move and keeps in a static state.

When the oil cylinder is actively retracted, the first electromagnetic directional valve is in a closed state, oil introduced from the oil supplementing port 4 flows to the second one-way valve 19 through an internal oil way, enters the oil pump A cavity interface 6 through the second one-way valve 19 along the internal oil way, is discharged from the oil pump B cavity interface 5, after the balance valve is opened, the oil enters the rod cavity 3 of the oil cylinder 1 through the balance valve, the piston rod retracts under the pressure action of the oil on the piston, and the oil in the rodless cavity 2 of the oil cylinder 1 flows out from the oil return port 7.

When the follow-up extends out, the first electromagnetic directional valve is opened, the rod cavity 3 and the rodless cavity 2 of the oil cylinder 1 are communicated through an internal oil circuit, the rodless cavity 2 of the oil cylinder 1 is communicated with the oil tank 24, and the piston can stay at any position under the action of load pull force.

Example 2

Referring to fig. 1 to 3, the present invention further provides a test hydraulic system including the hydraulic actuator valve group of embodiment 1, further including: the device comprises an oil tank 24, a fixed displacement pump 25, a second reversing unit 26, a third reversing unit 27 and an overflow unit 28, wherein the input port of the fixed displacement pump 25 is connected with the oil tank 24; the input end of the second reversing unit 26 is communicated with the output port of the constant delivery pump 25, and the output end of the second reversing unit 26 is communicated with the oil tank 24; the third reversing unit 27 is connected with the second reversing unit 26 in parallel, the input end of the third reversing unit 27 is communicated with the output port of the constant delivery pump 25, and the output end of the third reversing unit 27 is communicated with the oil tank 24; the input end of the overflow unit 28 is communicated with the output end of the constant delivery pump 25, and the output end of the overflow unit 28 is communicated with the oil tank 24.

The testing connection unit I29 is communicated with a rodless cavity 2 of the oil cylinder 1, the testing connection unit II 30 is communicated with a rod cavity 3 of the oil cylinder 1, the testing connection unit III 31 is communicated with a cavity interface 5 of an oil pump B, the testing connection unit IV 32 is communicated with a cavity interface 6 of the oil pump A, the testing connection unit V33 is communicated with an oil supplementing port 4, and the testing connection unit VI is communicated with an oil return port 7.

And a branch oil path 35 is arranged on an oil path for communicating the output port of the fixed displacement pump 25 and the second reversing unit 26, and a first test connection unit 29, a second test connection unit 30, a third test connection unit 31, a fourth test connection unit 32 and a fifth test connection unit 33 are arranged at one end of the branch oil path 35 in parallel and are communicated with the branch oil path 35.

According to the test hydraulic system, the metering pump 25 in the test hydraulic system is used for enabling oil liquid in the oil tank 24 to pass through the hydraulic actuator valve bank, so that valve bank flushing, valve bank set pressure confirmation, oil line pressure maintaining test of the rod cavity 3 of the oil cylinder 1, oil line pressure maintaining test of the cavity A of the oil pump, oil line pressure maintaining test of the cavity B of the oil pump, valve bank leakage test, valve bank function confirmation and pressure sensor function confirmation test items can be carried out by controlling the hydraulic actuator valve bank in the test hydraulic system, and test efficiency can be improved by controlling the test hydraulic system to carry out various tests on the hydraulic actuator valve bank.

The first test connection unit 29, the second test connection unit 30, the third test connection unit 31, the fourth test connection unit 32 and the fifth test connection unit 33 all comprise a second electromagnetic directional valve and a fourth pressure sensor, the second electromagnetic directional valve is a normally closed electromagnetic directional valve, an input port of the second electromagnetic directional valve is communicated with the branch oil path 35, and the fourth pressure sensor is arranged at one end of an output port of the second electromagnetic directional valve.

The second reversing unit 26 comprises a third electromagnetic reversing valve 36 and a fourth overflow valve 37, the third electromagnetic reversing valve 36 is a normally open type electromagnetic reversing valve, an input port of the third electromagnetic reversing valve 36 is communicated with an output port of the constant delivery pump 25, an output port of the third electromagnetic reversing valve 36 is communicated with an input port of the fourth overflow valve 37, and an output port of the fourth overflow valve 37 is communicated with the oil tank 24. The third reversing unit 27 includes a fourth electromagnetic reversing valve, the fourth electromagnetic reversing valve is a normally open type electromagnetic reversing valve, an input port of the fourth electromagnetic reversing valve is communicated with an output port of the fixed displacement pump 25, and an output port of the fourth electromagnetic reversing valve is communicated with the oil tank 24. The overflow unit 28 includes a fifth overflow valve, an input port of which communicates with an output port of the fixed displacement pump 25, and an output port of which communicates with the oil tank 24.

The branch oil passage 35 is provided with a flow rate control unit 38, and the flow rate control unit 38 adjusts and controls the flow rate in the branch oil passage 35. The flow control unit 38 includes a needle valve 39, an input port of which is communicated with an output port of the fixed displacement pump 25, and a flow sensor 40, which is provided at one end of the output port of the needle valve 39. By adjusting the size of the opening of the needle valve 39, the flow of the oil flowing through is adjusted, and then the flow is detected through the flow sensor 40, so that the data when the hydraulic actuator valve block is subjected to a leakage test is more accurate. And a pressure gauge 41 is arranged on an oil path for communicating the output port of the fixed displacement pump 25 with the second reversing unit 26, and the pressure gauge 41 is used for observing the oil pressure output by the fixed displacement pump 25.

Also included is an oil temperature control system 42, the oil temperature control system 42 being connected to the interior of the tank 24 for temperature control of the oil within the tank 24. The oil temperature control system 42 includes: the oil tank 24 temperature sensor, the heater 44, the air cooler 45 and the controller, the oil tank 24 temperature sensor sets up and detects the temperature of fluid in the oil tank 24, the heater 44 sets up inside the oil tank 24, the air cooler 45 sets up in one side of oil tank 24 in order to carry out temperature cooling to oil tank 24, and oil tank 24 temperature sensor, heater 44 and air cooler 45 all are connected with the controller electricity. The fluid temperature control system 42 during operation, oil tank 24 temperature sensor detects the temperature of oil tank 24 to the data that will detect are uploaded and are transmitted the controller, and when oil tank 24 temperature was crossed low, the fluid of controller control heater 44 in to oil tank 24 heated the intensification, and when oil tank 24 temperature sensor detected oil tank 24 high temperature, controller control forced air cooler 45 cooled down fluid, thereby effectively maintain the fluid in the oil tank 24 in the fluid temperature range of settlement.

A level relay 46 is disposed within tank 24, and level relay 46 is configured to monitor a level of tank 24. An air filter 47 is also arranged on the oil tank 24, and the air filter 47 is used for maintaining the pressure difference between the inside and the outside of the hydraulic oil tank 24. The fixed displacement pump 25 is connected with a motor 48, and the motor 48 and the fixed displacement pump 25 jointly provide a power oil source for the hydraulic system.

A high-pressure filter 49 is further arranged between the fixed displacement pump 25 and the pressure gauge 41, a third one-way valve 50 is arranged between the fixed displacement pump 25 and the high-pressure filter 49, an outlet of the third one-way valve 50 faces the high-pressure filter 49, and the third one-way valve 50 is used for protecting the fixed displacement pump 25 from impact of subsequent load changes. The high-pressure filter 49 filters the hydraulic oil output by the constant delivery pump 25, so that the oil cleanliness of the system is ensured, and other hydraulic components are prevented from being blocked due to the influence of the oil cleanliness after the filter.

The working principle is as follows: when the first-step flushing test is carried out, the third electromagnetic directional valve 36 and the fourth electromagnetic directional valve are powered on and closed, the second electromagnetic directional valve in the first test connection unit 29 is powered on and opened, oil output by the constant delivery pump 25 enters the oil supplementing port 4 through the first test connection unit 29, and the flushing test is carried out on the adjustable throttle valve, the first check valve 18, the second check valve 19, the balance valve, the first overflow valve and the first throttle valve in the hydraulic actuator valve group.

When the second-step flushing test is carried out, the fourth electromagnetic directional valve is powered on and closed, the second electromagnetic directional valve in the third test connecting unit 31 is powered on and opened, oil output by the constant delivery pump 25 enters the interface 5 of the cavity B of the oil pump through the third test connecting unit 31, and a third overflow valve and a first throttle valve in the hydraulic actuator valve group are subjected to the flushing test.

When the pressure of the first overflow valve is confirmed, the third electromagnetic directional valve 36 and the fourth electromagnetic directional valve are powered on and closed, the second electromagnetic directional valve in the test connection unit four 32 is powered on and opened, oil output by the constant delivery pump 25 enters the oil pump A cavity interface 6 through the test connection unit four 32, the set pressure of the first overflow valve is detected through the fourth pressure sensor in the test connection unit four 32, and the return circuit is reset after the confirmation is finished.

When the set pressure of the balance valve is confirmed, the second overflow valve is closed, meanwhile, the fourth electromagnetic directional valve is powered on and closed, the second electromagnetic directional valve in the second test connection unit 30 is powered on and opened, oil output by the constant delivery pump 25 enters the oil cylinder 1 rod cavity 3 through the second test connection unit 30, the set pressure of the balance valve is detected through the fourth pressure sensor in the second test connection unit 30, and the return circuit is reset after the confirmation is finished.

When the set pressure of the second overflow valve is confirmed, the fourth electromagnetic directional valve is powered on and closed, the second electromagnetic directional valve in the second testing connection unit 30 is powered on and opened, oil output by the constant delivery pump 25 enters the rod cavity 3 of the oil cylinder 1 through the second testing connection unit 30, the set pressure of the second overflow valve is detected through a fourth pressure sensor in the second testing connection unit 30, and the return circuit is reset after the confirmation is finished.

When the set pressure of the third overflow valve is confirmed, the adjustable throttle valve is closed, the third electromagnetic directional valve 36 and the fourth electromagnetic directional valve are powered on and closed, the second electromagnetic directional valve in the third test connection unit 31 is powered on and opened, oil output by the constant delivery pump 25 enters the interface 5 of the cavity B of the oil pump through the third test connection unit 31, the set pressure of the third overflow valve is detected through the fourth pressure sensor in the third test connection unit 31, the value of the second pressure sensor 21 is observed at the same time, and the loop is reset after the confirmation is finished.

When the oil circuit pressure maintaining test of the rod cavity 3 of the oil cylinder 1 is carried out, the adjustable throttle valve is closed, meanwhile, the third electromagnetic directional valve 36 and the fourth electromagnetic directional valve are powered to be closed, the second electromagnetic directional valve in the second test connecting unit 30 is powered to be opened, oil output by the constant delivery pump 25 enters the rod cavity 3 of the oil cylinder 1 through the second test connecting unit 30, the pressure maintaining test is carried out on the rod cavity 3 of the oil cylinder 1 through detecting or reading the value of the flow sensor 40, and the return circuit is reset after the completion of the confirmation.

When the oil pressure maintaining test of the oil path of the oil pump cavity A interface 6 is carried out, the adjustable throttle valve is closed, meanwhile, the third electromagnetic directional valve 36 and the fourth electromagnetic directional valve are powered on and closed, the second electromagnetic directional valve in the test connection unit IV 32 is powered on and opened, oil output by the constant delivery pump 25 enters the oil pump cavity A interface 6 through the test connection unit IV 32, the oil pump cavity A is subjected to the pressure maintaining test through detecting or reading the value of the flow sensor 40, and the return circuit is reset after the completion of the confirmation.

When the oil path pressure maintaining test of the oil pump B cavity interface 5 is carried out, the adjustable throttle valve is closed, meanwhile, the third electromagnetic directional valve 36 and the fourth electromagnetic directional valve are powered on and closed, the second electromagnetic directional valve in the third test connecting unit 31 is powered on and opened, oil output by the constant delivery pump 25 enters the oil pump B cavity interface 5 through the third test connecting unit 31, the numerical value oil pump B cavity is subjected to the pressure maintaining test through detecting or reading the flow sensor 40, and the return circuit is reset after the completion of the confirmation.

When the throttle valve leakage test is carried out, oil output by the constant delivery pump 25 is controlled to enter the hydraulic actuator valve block from the rodless cavity 2 of the oil cylinder 1, the leakage test is carried out on the adjustable unit 17 by detecting or reading the value of the flow sensor 40, and the loop is reset after the completion of the detection.

When the function test of the first electromagnetic directional valve is carried out, oil output by the quantitative pump 25 is controlled to enter the hydraulic actuator valve group from the rod cavity 3 of the oil cylinder 1, the first electromagnetic directional valve is switched from an open state to a closed state and then switched to the open state, the function test of the first electromagnetic directional valve is carried out by detecting or reading whether the numerical value of the flow sensor 40 is changed from small to large and then reduced, and the return circuit is reset after the completion of the confirmation.

Example 3

Referring to fig. 1 to 7, the invention further provides a valve group testing method, which adopts the testing hydraulic system in embodiment 2, and includes the following steps:

s1, performing a flushing test, controlling oil at the output port of the constant delivery pump 25, controlling the oil to enter the hydraulic actuator valve group from the oil supplementing port 4 and the oil pump B cavity interface 5 to perform a flushing test on a valve group hydraulic valve element, and resetting a loop after flushing;

s2, confirming the pressure of a hydraulic valve element of the hydraulic actuator valve group, controlling oil output by the constant delivery pump 25 to enter the hydraulic actuator valve group from an oil pump A cavity interface 6, an oil cylinder 1 rod cavity 3 and an oil pump B cavity interface 5, confirming the pressure of the valve group hydraulic valve element through a fourth pressure sensor in a test connection unit IV 32, a test connection unit II 30 and a test connection unit III 31, and resetting a loop after the confirmation is finished;

s3, oil path pressure maintaining test, wherein oil output by the constant delivery pump 25 is controlled to enter the hydraulic actuator valve group from the rod cavity 3 of the oil cylinder 1, the interface 6 of the cavity A of the oil pump and the interface 5 of the cavity B of the oil pump, the pressure maintaining test is carried out on the oil paths of the rod cavity 3 of the oil cylinder 1, the cavity A of the oil pump and the cavity B of the oil pump by detecting or reading the value of the flow sensor 40, and the return circuit is reset after the completion of the confirmation;

s4, leakage test, wherein oil output by the constant delivery pump 25 is controlled to enter the hydraulic actuator valve group from the rodless cavity 2 of the oil cylinder 1, the leakage test is carried out on the adjustable unit 17 by detecting or reading the value of the flow sensor 40, and the loop is reset after the completion of the detection;

and S5, performing a function test on the first reversing unit 8, controlling the oil output by the constant delivery pump 25 to enter the hydraulic actuator valve bank from the rod cavity 3 of the oil cylinder 1, switching the first reversing unit 8 from an open state to a closed state, switching the first reversing unit 8 to the open state, performing a function test on the first reversing unit 8 by detecting or reading whether the value of the flow sensor 40 changes from small to large and then decreases, and resetting the loop after the confirmation is finished.

Step S1 includes:

s11, closing the second reversing unit 26 and the third reversing unit 27, opening the first testing connection unit 29, enabling oil output by the fixed displacement pump 25 to enter the oil supplementing port 4 through the first testing connection unit 29, performing flushing test on the pressure maintaining unit 9, the adjustable unit 17, the opening unit 10 and the first throttling unit 13 in the hydraulic actuator valve bank, and resetting a loop after flushing;

and S12, the third reversing unit 27 is closed, the third testing connection unit 31 is opened, oil output by the fixed displacement pump 25 enters the oil pump B cavity interface 5 through the third testing connection unit 31, the second safety protection unit 16 and the first throttling unit 13 in the hydraulic actuator valve bank are subjected to flushing test, and the circuit is reset after flushing.

Step S2 includes:

s21, the second reversing unit 26 and the third reversing unit 27 are closed, the testing connection unit IV 32 is opened, oil output by the fixed displacement pump 25 enters the oil pump A cavity interface 6 through the testing connection unit IV 32, the set pressure of the opening unit 10 is detected through a fourth pressure sensor in the testing connection unit IV 32, and the loop is reset after the completion of the confirmation;

s22, closing the first safety protection unit 15, closing the third reversing unit 27 at the same time, opening the second testing connection unit 30, enabling oil output by the constant delivery pump 25 to enter the rod cavity 3 of the oil cylinder 1 through the second testing connection unit 30, detecting the set pressure of the pressure maintaining unit 9 through a fourth pressure sensor in the second testing connection unit 30, and resetting the loop after the completion of the detection;

s23, the third reversing unit 27 is closed, the second testing connection unit 30 is opened, oil output by the constant delivery pump 25 enters the rod cavity 3 of the oil cylinder 1 through the second testing connection unit 30, the set pressure of the first safety protection unit 15 is detected through a fourth pressure sensor in the second testing connection unit 30, and the loop is reset after the completion of the detection;

and S24, closing the adjustable unit 17, closing the second reversing unit 26 and the third reversing unit 27, opening the third testing connection unit 31, enabling the oil output by the constant delivery pump 25 to enter the cavity B interface 5 of the oil pump through the third testing connection unit 31, detecting the set pressure of the second safety protection unit 16 through a fourth pressure sensor in the third testing connection unit 31, observing the value of the second pressure sensor 21, and resetting the loop after the completion of the confirmation.

Step S3 includes:

s31, closing the adjustable unit 17, closing the second reversing unit 26 and the third reversing unit 27, opening the second testing connection unit 30, enabling oil output by the constant delivery pump 25 to enter the rod cavity 3 of the oil cylinder 1 through the second testing connection unit 30, performing pressure maintaining test on the rod cavity 3 of the oil cylinder 1 by detecting or reading the value of the flow sensor 40, and resetting the loop after the completion of the test;

s32, closing the adjustable unit 17, closing the second reversing unit 26 and the third reversing unit 27, opening the test connection unit IV 32, allowing oil output by the fixed displacement pump 25 to enter the oil pump A cavity interface 6 through the test connection unit IV 32, performing pressure maintaining test on the oil pump A cavity by detecting or reading the value of the flow sensor 40, and resetting the loop after the completion of the test;

and S33, closing the adjustable unit 17, closing the second reversing unit 26 and the third reversing unit 27, opening the third testing connection unit 31, allowing the oil output by the fixed displacement pump 25 to enter the interface 5 of the cavity B of the oil pump through the third testing connection unit 31, performing pressure maintaining test on the cavity B of the oil pump by detecting or reading the value of the flow sensor 40, and resetting the loop after the completion of the test.

The hydraulic actuator valve group has the advantages that the hydraulic actuator valve group can control the action of the piston rod of the oil cylinder 1, and multi-stage pressure regulation is carried out on the actuator hydraulic circuit through the actuator valve group, so that the piston rod of the oil cylinder 1 can be controlled to have several actions of differential extension, static position retention, passive extension, active retraction and follow-up extension; when the follow-up extends out, the piston rod can stay at any position under the action of the load pulling force.

The invention relates to a test hydraulic system, which passes oil in an oil tank 24 into a hydraulic actuator valve group through a constant delivery pump 25 in the test system, thereby carrying out valve group flushing, valve group set pressure confirmation, oil path pressure maintaining test of a rod cavity 3 of an oil cylinder 1, oil path pressure maintaining test of an oil pump cavity A, oil path pressure maintaining test of an oil pump cavity B, valve group leakage test, valve group function confirmation and pressure sensor function confirmation test items through controlling the hydraulic actuator valve group in the test hydraulic system, introducing the oil in the oil tank 24 into the hydraulic actuator valve group through the constant delivery pump 25, then controlling the action of a piston rod of the oil cylinder 1 through the hydraulic actuator valve group, periodically testing and troubleshooting the hydraulic actuator valve through the test hydraulic system in the use process, and after the test hydraulic system is installed at one time, when the hydraulic actuator valve is periodically tested and troubleshot, the hydraulic actuator valve group testing device has the advantages that the hydraulic actuator valve group testing device does not need to be detached and reinstalled, is convenient to use, is convenient to test and troubleshoot the hydraulic actuator valve group, and can improve the testing efficiency by controlling the hydraulic actuator valve group testing device to carry out various tests on the FAST hydraulic actuator valve group.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and must be determined by the scope of the claims.

Claims

1. The utility model provides a hydraulic actuator valves, uses in FAST hydraulic actuator, and hydraulic actuator valves links to each other with hydro-cylinder (1) in order to control the action of hydro-cylinder (1) piston rod, and hydro-cylinder (1) include no pole chamber (2) and have pole chamber (3), its characterized in that: the hydraulic actuator valve block includes: the oil supplementing port (4) is communicated with the oil pump B cavity interface (5) through a first oil path (11), and the oil supplementing port (4) is communicated with the oil pump A cavity interface (6) through a second oil path (12);

the input end of the pressure maintaining unit (9) is communicated with the rod cavity (3) of the oil cylinder (1), and the output end of the pressure maintaining unit (9) is communicated with the first oil way (11);

the output end of the first reversing unit (8) is communicated with the input end of the pressure maintaining unit (9), and the input end of the first reversing unit (8) is communicated with the rodless cavity (2) of the oil cylinder (1);

the input end of the opening unit (10) is communicated with the second oil path (12), the output end of the opening unit (10) is communicated with the rodless cavity (2) of the oil cylinder (1), and the input end of the opening unit (10) is connected with the pressure maintaining unit (9) to open the pressure maintaining unit (9);

a first throttling unit (13) is arranged between a rodless cavity (2) of the oil cylinder (1) and the oil return opening (7), the input end of the first throttling unit (13) is communicated with the rodless cavity (2) of the oil cylinder (1), and the output end of the first throttling unit (13) is communicated with the oil return opening (7).

2. A hydraulic actuator valve block as claimed in claim 1, wherein: the input of pressurize unit (9) with be linked together through third oil circuit (14) between first throttling unit (13), be provided with first safety protection unit (15) on third oil circuit (14), the input of first safety protection unit (15) with the input of pressurize unit (9) is linked together, the output of first safety protection unit (15) with the input of first throttling unit (13) is linked together, first safety protection unit (15) are used for right the input port pressure release of pressurize unit (9) plays the safety protection effect in order to the oil circuit.

3. A hydraulic actuator valve block as claimed in claim 2, wherein: the output end of the pressure maintaining unit (9) is communicated with the output end of the first safety protection unit (15) through a fourth oil path, and a second safety protection unit (16) is arranged on the fourth oil path.

4. A hydraulic actuator valve block as claimed in claim 1, wherein: one side of first switching-over unit (8) is parallelly connected to be provided with adjustable unit (17), the input of adjustable unit (17) with the output of pressurize unit (9) is linked together, the output of adjustable unit (17) is linked together with rodless chamber (2) of hydro-cylinder (1), adjustable unit (17) can be manually or automatically opened so that the fluid of the input of first switching-over unit (8) and output department passes through adjustable unit (17) circulation.

5. A hydraulic actuator valve block as claimed in claim 1, wherein: the first oil way (11) is provided with a first one-way valve (18), an input port of the first one-way valve (18) is communicated with the oil supplementing port (4), and an output port of the first one-way valve (18) is communicated with the cavity B interface (5) of the oil pump.

6. A hydraulic actuator valve block as claimed in claim 1, wherein: and a second one-way valve (19) is arranged on the second oil way (12), an input port of the second one-way valve (19) is communicated with the oil supplementing port (4), and an output port of the second one-way valve (19) is communicated with the cavity A interface (6) of the oil pump.

7. A hydraulic actuator valve block as claimed in claim 1, wherein: the pressure detection device is characterized in that a first pressure sensor (20) is arranged on an internal oil path of an input end of the pressure maintaining unit (9) and a rod cavity (3) of the communication oil cylinder (1), and the pressure of an input section of the pressure maintaining unit (9) and the rod cavity (3) of the oil cylinder (1) is detected by the first pressure sensor (20).

8. A hydraulic actuator valve block as claimed in claim 1, wherein: and a second pressure sensor (21) is arranged on the first oil path (11), and the second pressure sensor (21) detects the pressure at the cavity interface (5) of the oil pump B.

9. A hydraulic actuator valve block as claimed in claim 1, wherein: and a third pressure sensor (22) is arranged on the second oil path (12), and the third pressure sensor (22) detects the pressure at the cavity A interface (6) of the oil pump.

10. A hydraulic actuator valve block as claimed in claim 1, wherein: the first reversing unit (8) comprises a first electromagnetic reversing valve, an input port of the first electromagnetic reversing valve is communicated with the rodless cavity (2) of the oil cylinder (1), and an output port of the first electromagnetic reversing valve is communicated with an input end of the pressure maintaining unit (9).

11. A hydraulic actuator valve block as claimed in claim 1, wherein: the opening unit (10) comprises a first overflow valve, an input port of the first overflow valve is communicated with the second oil path (12), and an output port of the first overflow valve is communicated with the rodless cavity (2) of the oil cylinder (1).

12. A hydraulic actuator valve block as claimed in claim 1, wherein: the pressure maintaining unit (9) comprises a balance valve, an input port of the balance valve is communicated with the rod cavity (3) of the oil cylinder (1), and an output end of the first reversing unit (8) is communicated with an input port of the balance valve.

13. A hydraulic actuator valve block as claimed in claim 3, wherein: the first safety protection unit (15) is a second overflow valve, and the second safety protection unit (16) is a third overflow valve.

14. A hydraulic actuator valve block as claimed in claim 4, wherein: the adjustable unit (17) is an adjustable throttle valve, and when the first reversing unit (8) breaks down, the adjustable throttle valve is manually or automatically opened to enable oil to flow.

15. A hydraulic actuator valve block as claimed in claim 1, wherein: the pressure maintaining unit (9) is provided with a second throttling unit (23) between the first reversing unit (8), the input port of the second throttling unit (23) is communicated with the input end of the pressure maintaining unit (9), and the output end of the second throttling unit (23) is communicated with the input end of the first reversing unit (8).

16. A hydraulic actuator valve block as set forth in claim 15 wherein: the first throttling unit (13) is a first throttling valve, and the second throttling unit (23) is a second throttling valve.

17. A test hydraulic system, characterized by: the method comprises the following steps:

the hydraulic actuator valve block of any of claims 1-16;

a fuel tank (24);

the input port of the fixed displacement pump (25) is connected with the oil tank (24);

the input end of the second reversing unit (26) is communicated with the output end of the fixed displacement pump (25), and the output end of the second reversing unit (26) is communicated with the oil tank (24);

the third reversing unit (27) is connected with the second reversing unit (26) in parallel, the input end of the third reversing unit (27) is communicated with the output port of the fixed displacement pump (25), and the output end of the third reversing unit (27) is communicated with the oil tank (24);

the input end of the overflow unit (28) is communicated with the output end of the constant delivery pump (25), and the output end of the overflow unit (28) is communicated with the oil tank (24);

the testing connection unit I (29), the testing connection unit II (30), the testing connection unit III (31), the testing connection unit IV (32), the testing connection unit V (33) and the testing connection unit VI (34), wherein the testing connection unit I (29) is communicated with a rodless cavity (2) of the oil cylinder (1), the testing connection unit II (30) is communicated with a rod cavity (3) of the oil cylinder (1), the testing connection unit III (31) is communicated with a cavity interface (5) of the oil pump B, the testing connection unit IV (32) is communicated with a cavity interface (6) of the oil pump A, the testing connection unit V (33) is communicated with an oil supplementing port (4), and the testing connection unit VI is communicated with an oil return port (7);

and a branch oil path (35) is arranged on an oil path for communicating the output port of the fixed displacement pump (25) with the second reversing unit (26), and the first test connection unit (29), the second test connection unit (30), the third test connection unit (31), the fourth test connection unit (32) and the fifth test connection unit (33) are arranged in parallel at one end of the branch oil path (35) and communicated with the branch oil path (35).

18. The test hydraulic system of claim 17, wherein: the first test connection unit (29), the second test connection unit (30), the third test connection unit (31), the fourth test connection unit (32) and the fifth test connection unit (33) all comprise a second electromagnetic directional valve and a fourth pressure sensor, an input port of the second electromagnetic directional valve is communicated with the branch oil path (35), and the fourth pressure sensor is arranged at one end of an output port of the second electromagnetic directional valve.

19. The test hydraulic system of claim 17, wherein: the second reversing unit (26) comprises a third electromagnetic reversing valve (36) and a fourth overflow valve (37), an input port of the third electromagnetic reversing valve (36) is communicated with an output port of the constant delivery pump (25), an output port of the third electromagnetic reversing valve (36) is communicated with an input port of the fourth overflow valve (37), and an output port of the fourth overflow valve (37) is communicated with the oil tank (24).

20. The test hydraulic system of claim 17, wherein: the third reversing unit (27) comprises a fourth electromagnetic reversing valve, an input port of the fourth electromagnetic reversing valve is communicated with an output port of the fixed displacement pump (25), and an output port of the fourth electromagnetic reversing valve is communicated with the oil tank (24).

21. The test hydraulic system of claim 17, wherein: the overflow unit (28) comprises a fifth overflow valve, an input port of the fifth overflow valve is communicated with an output port of the constant delivery pump (25), and an output port of the fifth overflow valve is communicated with the oil tank (24).

22. The test hydraulic system of claim 17, wherein: the branch oil path (35) is provided with a flow control unit (38), and the flow control unit (38) adjusts and controls the flow in the branch oil path (35).

23. The test hydraulic system of claim 22, wherein: flow control unit (38) include needle valve (39) and flow sensor (40), the input port of needle valve (39) is linked together with the delivery outlet of constant delivery pump (25), flow sensor (40) set up the one end in the delivery outlet of needle valve (39).

24. The test hydraulic system of claim 17, wherein: and a pressure gauge (41) is arranged on an oil path for communicating the output port of the constant delivery pump (25) with the second reversing unit (26), and the pressure gauge (41) is used for observing the oil pressure output by the constant delivery pump (25).

25. The test hydraulic system of claim 17, wherein: the oil-liquid temperature control system (42) is connected with the inside of the oil tank (24) so as to control the temperature of the oil liquid in the oil tank (24).

26. The test hydraulic system of claim 25, wherein: the oil temperature control system (42) includes: oil tank (24) temperature sensor, heater (44), air cooler (45) and controller, oil tank (24) temperature sensor sets up and detects the temperature of fluid in oil tank (24), heater (44) set up inside oil tank (24), air cooler (45) set up one side of oil tank (24) is in order to carry out the temperature cooling to oil tank (24), oil tank (24) temperature sensor, heater (44) and air cooler (45) all with the controller electricity is connected.

27. A valve bank testing method is characterized in that: use of a test hydraulic system according to any one of claims 17-26, comprising the steps of:

s1, performing a flushing test, controlling oil at the output port of the constant delivery pump (25), controlling the oil to enter a hydraulic actuator valve group from an oil supplementing port (4) and an oil pump B cavity interface (5) to perform a flushing test on a valve group hydraulic valve element, and resetting a loop after flushing;

s2, confirming the pressure of a hydraulic valve element of the hydraulic actuator valve group, controlling oil output by the fixed displacement pump (25) to enter the hydraulic actuator valve group from an oil pump A cavity interface (6), a rod cavity (3) of the oil cylinder (1) and an oil pump B cavity interface (5), confirming the pressure of the hydraulic valve element of the valve group through a fourth pressure sensor in a test connection unit IV (32), a test connection unit II (30) and a test connection unit III (31), and resetting a loop after the confirmation is finished;

s3, oil path pressure maintaining test, wherein oil output by the constant delivery pump (25) is controlled to enter a hydraulic actuator valve group from a rod cavity (3) of the oil cylinder (1), an oil pump A cavity interface (6) and an oil pump B cavity interface (5), the oil paths of the rod cavity (3) of the oil cylinder (1), the oil pump A cavity and the oil pump B cavity are subjected to pressure maintaining test by detecting or reading the value of the flow sensor (40), and a return circuit is reset after the completion of the test;

s4, leakage testing, wherein oil output by the constant delivery pump (25) is controlled to enter the hydraulic actuator valve group from the rodless cavity (2) of the oil cylinder (1), leakage testing is carried out on the adjustable unit (17) by detecting or reading the value of the flow sensor (40), and the return circuit is reset after confirmation is finished;

s5, the first reversing unit (8) performs function test, oil output by the fixed displacement pump (25) is controlled to enter the hydraulic actuator valve group from the rod cavity (3) of the oil cylinder (1), the first reversing unit (8) is switched from an open state to a closed state and then to an open state, the first reversing unit (8) is subjected to function test by detecting or reading whether the numerical value of the flow sensor (40) changes from small to large and then reduces, and the return circuit is reset after confirmation is completed.

28. The valve manifold testing method of claim 27, wherein: step S1 includes:

s11, the second reversing unit (26) and the third reversing unit (27) are closed, the first testing connection unit (29) is opened, oil output by the fixed displacement pump (25) enters the oil supplementing port (4) through the first testing connection unit (29), a flushing test is carried out on the pressure maintaining unit (9), the adjustable unit (17), the opening unit (10) and the first throttling unit (13) in the hydraulic actuator valve bank, and a return circuit is reset after flushing;

and S12, the third reversing unit (27) is closed, the third testing connection unit (31) is opened, oil output by the metering pump (25) enters the oil pump B cavity interface (5) through the third testing connection unit (31), the second safety protection unit (16) and the first throttling unit (13) in the hydraulic actuator valve bank are subjected to flushing test, and a loop is reset after flushing.

29. The valve manifold testing method of claim 27, wherein: step S2 includes:

s21, the second reversing unit (26) and the third reversing unit (27) are closed, the testing connection unit IV (32) is opened, oil output by the fixed displacement pump (25) enters the oil pump A cavity interface (6) through the testing connection unit IV (32), the set pressure of the opening unit (10) is detected through a fourth pressure sensor in the testing connection unit IV (32), and the loop is reset after the completion of the confirmation;

s22, closing the first safety protection unit (15), closing the third reversing unit (27) at the same time, opening the second testing connection unit (30), enabling oil output by the constant delivery pump (25) to enter the rod cavity (3) of the oil cylinder (1) through the second testing connection unit (30), detecting the set pressure of the pressure maintaining unit (9) through a fourth pressure sensor in the second testing connection unit (30), and resetting the loop after the completion of the detection;

s23, the third reversing unit (27) is closed, the second testing connection unit (30) is opened, oil output by the fixed displacement pump (25) enters the rod cavity (3) of the oil cylinder (1) through the second testing connection unit (30), the set pressure of the first safety protection unit (15) is detected through a fourth pressure sensor in the second testing connection unit (30), and the loop is reset after the completion of the detection;

and S24, closing the adjustable unit (17), closing the second reversing unit (26) and the third reversing unit (27), opening the test connection unit III (31), enabling oil output by the fixed displacement pump (25) to enter the oil pump B cavity interface (5) through the test connection unit III (31), detecting the set pressure of the second safety protection unit (16) through a fourth pressure sensor in the test connection unit III (31), observing the value of the second pressure sensor (21), and resetting the loop after confirmation is finished.

30. The valve manifold testing method of claim 27, wherein: step S3 includes:

s31, closing the adjustable unit (17), closing the second reversing unit (26) and the third reversing unit (27), opening the second testing connection unit (30), enabling oil output by the constant delivery pump (25) to enter the rod cavity (3) of the oil cylinder (1) through the second testing connection unit (30), performing pressure maintaining test on the rod cavity (3) of the oil cylinder (1) through detecting or reading the value of the flow sensor (40), and resetting the loop after the completion of the test;

s32, closing the adjustable unit (17), closing the second reversing unit (26) and the third reversing unit (27) at the same time, opening the test connection unit IV (32), enabling oil output by the constant delivery pump (25) to enter an oil pump A cavity interface (6) through the test connection unit IV (32), performing pressure maintaining test on the oil pump A cavity through detecting or reading the value of the flow sensor (40), and resetting the loop after the completion of the test;

and S33, closing the adjustable unit (17), closing the second reversing unit (26) and the third reversing unit (27) at the same time, opening the test connection unit III (31), enabling oil output by the fixed displacement pump (25) to enter an oil pump B cavity interface (5) through the test connection unit III (31), performing pressure maintaining test on the oil pump B cavity through detecting or reading the value of the flow sensor (40), and resetting the loop after the completion of the test.