CN114060355B - Hydraulic test system and test method - Google Patents

Hydraulic test system and test method Download PDF

Info

Publication number
CN114060355B
CN114060355B CN202111417001.2A CN202111417001A CN114060355B CN 114060355 B CN114060355 B CN 114060355B CN 202111417001 A CN202111417001 A CN 202111417001A CN 114060355 B CN114060355 B CN 114060355B
Authority
CN
China
Prior art keywords
oil
way
reversing valve
valve
hydraulic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202111417001.2A
Other languages
Chinese (zh)
Other versions
CN114060355A (en
Inventor
马振军
陆军
吴柏荣
孙伟豪
陈凯欣
张帅君
麦志辉
兰秀国
邹琦
喻祥
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Jing Yin Ocean Engineering Co Ltd
Original Assignee
Guangdong Jing Yin Ocean Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Jing Yin Ocean Engineering Co Ltd filed Critical Guangdong Jing Yin Ocean Engineering Co Ltd
Priority to CN202111417001.2A priority Critical patent/CN114060355B/en
Publication of CN114060355A publication Critical patent/CN114060355A/en
Application granted granted Critical
Publication of CN114060355B publication Critical patent/CN114060355B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering

Abstract

The invention provides a hydraulic test system and a test method, wherein the system comprises an ultrahigh pressure test oil circuit, a first low-medium-high pressure test oil circuit and a flushing pipeline oil circuit, and 6 modes of working condition tests such as an ultrahigh pressure oil cylinder rodless cavity and rod cavity pressure maintaining test, a high-medium-low pressure oil cylinder rodless cavity and rod cavity pressure maintaining test, a flushing pipeline and a minimum starting pressure test can be realized by utilizing the three oil circuits. The invention effectively improves the utilization rate and the working efficiency of the test platform, and simultaneously can effectively flush the hydraulic pipeline and improve the reliability and the accuracy of the hydraulic cylinder test system.

Description

Hydraulic test system and test method
Technical Field
The invention relates to the field of hydraulic systems, in particular to a hydraulic test system and a test method.
Background
The hydraulic test platform is applied to the delivery test of the hydraulic cylinder on one hand and is applied to the test after the hydraulic cylinder is maintained on the other hand. The conventional hydraulic test platform in the market has single function, can not realize the simultaneous performance of multiple working conditions and multiple tests under one test, and has low utilization rate and working efficiency; and most of the pipelines used by the device need to be welded, and impurities such as welding slag generated in the welding process can possibly enter the pipelines, so that hydraulic oil is polluted if the welding slag cannot be cleaned in time, the abrasion of machine equipment elements is caused, the safe operation of the whole device is endangered, meanwhile, the daily use of the hydraulic oil can cause the pollution of the hydraulic oil, and the long-term accumulation can lead to the reduction of the service life of the hydraulic oil. Such as chinese patent publication No. CN206889394U, publication date 2018.1.16: a hydraulic cylinder durability test bed only provides a durability test, and is single in function, low in efficiency and incapable of effectively cleaning a hydraulic pipeline. Therefore, a hydraulic test platform capable of testing various working conditions and effectively cleaning a hydraulic pipeline is needed at present so as to fill up the market gap and improve the efficiency, accuracy and reliability of a hydraulic cylinder test.
Disclosure of Invention
The invention provides a hydraulic test system and a test method, which can realize the test of various working conditions of an oil cylinder, effectively improve the utilization rate and the working efficiency, and simultaneously can also effectively flush a hydraulic pipeline and improve the reliability and the accuracy of the hydraulic cylinder test system.
The technical scheme of the invention is as follows:
the hydraulic test system comprises an ultrahigh pressure test oil circuit, a first low-medium-high pressure test oil circuit, a flushing pipeline oil circuit, a first motor pump set and a second motor pump set;
the ultrahigh pressure test oil way comprises a first oil cylinder, a first hydraulic control one-way valve, a second hydraulic control one-way valve, a first three-position four-way reversing valve and a second three-position four-way reversing valve; the port A of the first three-position four-way reversing valve is communicated with a rod cavity of the first oil cylinder through a one-way valve, the port B of the first three-position four-way reversing valve is communicated with a rodless cavity of the first oil cylinder through a one-way valve, the port P of the first three-position four-way reversing valve is communicated with an oil tank through a first motor pump group, and the port T of the first three-position four-way reversing valve is connected with the oil tank through an oil return filter; an A port of the second three-position four-way reversing valve is communicated with a rodless cavity of the first oil cylinder through the first hydraulic control one-way valve, a B port of the second three-position four-way reversing valve is communicated with a rod cavity of the first oil cylinder through the second hydraulic control one-way valve, a P port of the second three-position four-way reversing valve is closed, and a T port of the second three-position four-way reversing valve is connected with an oil tank through an oil return filter; the control oil ports of the first hydraulic control one-way valve and the second hydraulic control one-way valve are respectively communicated with a rod cavity and a rodless cavity of the first oil cylinder to form a locking loop, and the first hydraulic control one-way valve and the second hydraulic control one-way valve realize on-off control through a pilot control oil way communicated with an oil tank; the rod cavity and the rodless cavity of the first oil cylinder are respectively communicated with the P1 and P2 oil ports of the ultrahigh-pressure hydraulic station;
The first low-medium-high pressure test oil way comprises a second oil cylinder, a third hydraulic control one-way valve, a fourth hydraulic control one-way valve and a third three-position four-way reversing valve; an A port of the third three-position four-way reversing valve is communicated with a rodless cavity of the second oil cylinder through the third hydraulic control one-way valve, a B port of the third three-position four-way reversing valve is communicated with a rod cavity of the second oil cylinder through the fourth hydraulic control one-way valve, a P port of the third three-position four-way reversing valve is communicated with an oil tank through the first motor pump group, and a T port of the third three-position four-way reversing valve is connected with the oil tank through an oil return filter; the control oil ports of the third hydraulic control one-way valve and the fourth hydraulic control one-way valve are respectively communicated with a rod cavity and a rodless cavity of the second oil cylinder to form a locking loop, and the third hydraulic control one-way valve and the fourth hydraulic control one-way valve realize on-off control through a pilot control oil way communicated with an oil tank;
the flushing pipeline oil way comprises a two-position three-way reversing valve and a cleaned pipeline group; the inlet of the first motor pump set is communicated with the oil tank, the outlet of the first motor pump set is communicated with the inlet of the cleaned pipeline set through the two-position three-way reversing valve, the inlet of the cleaned pipeline set is also communicated with the oil tank through the second motor pump set, and the outlet of the cleaned pipeline set is connected with the oil tank through an oil return filter;
The first three-position four-way reversing valve, the second three-position four-way reversing valve, the third three-position four-way reversing valve, the two-position three-way reversing valve, the first motor pump set and the second motor pump set are electrically connected with the PLC control box.
The hydraulic test system can realize tests of various working conditions through the ultrahigh pressure test oil way, the first low-medium-high pressure test oil way and the flushing pipeline oil way, can effectively improve test efficiency, particularly has the flushing pipeline oil way for flushing the pipeline, can realize effective cleaning of the hydraulic pipeline, prolongs the service life of the pipeline, reduces hydraulic oil pollution, improves test accuracy, and well fills the market gap.
Further, the system is provided with a second low-medium-high pressure test oil way and a third motor pump set;
the second low-medium-high pressure test oil way comprises a third oil cylinder, a fifth hydraulic control one-way valve, a sixth hydraulic control one-way valve and a fourth three-position four-way reversing valve; an A port of the fourth three-position four-way reversing valve is communicated with a rodless cavity of the third oil cylinder through the fifth hydraulic control one-way valve, a B port of the fourth three-position four-way reversing valve is communicated with a rod cavity of the third oil cylinder through the sixth hydraulic control one-way valve, a P port of the fourth three-position four-way reversing valve is communicated with an oil tank through the third motor pump group, and a T port of the fourth three-position four-way reversing valve is connected with the oil tank through an oil return filter; the control oil ports of the fifth hydraulic control check valve and the sixth hydraulic control check valve are respectively communicated with the rod cavity and the rodless cavity of the third oil cylinder to form a locking loop, and the fifth hydraulic control check valve and the sixth hydraulic control check valve realize on-off control through a pilot control oil way communicated with the oil tank.
The system of the invention can be provided with a second low-medium-high pressure test oil way in parallel, and can also be provided with a third low-medium-high pressure test oil way, a fourth low-medium-high pressure test oil way and a third low-medium-high pressure test oil way which have the same structure, and the third low-medium-high pressure test oil way and the fourth low-medium-high pressure test oil way are not exemplified here. The plurality of low-medium-high pressure test oil ways are additionally arranged and used for carrying out batch test on the plurality of oil cylinders, so that the test efficiency is further improved, the requirements of the plurality of oil cylinders for measuring different working conditions are met, and the response speed of external service can be effectively improved.
Further, the rod cavity and the rodless cavity of the second oil cylinder and the third oil cylinder are communicated with overflow valves, and the overflow valves realize on-off control through pilot control oil paths communicated with the oil tanks.
The overflow valve plays a safety protection role in the system. When the pressure of the system exceeds a specified value, the valve is opened, and part of gas in the system is discharged into the atmosphere, so that the pressure of the system does not exceed an allowable value, and the system is ensured not to have accidents due to the overhigh pressure.
Further, the first motor pump set comprises a first motor, a first plunger pump, a second plunger pump and a fifth three-position four-way reversing valve; the first motor is used for driving the first plunger pump and the second plunger pump simultaneously; the inlets of the first plunger pump and the second plunger pump are communicated with the oil tank, the outlets of the first plunger pump and the second plunger pump are communicated with the P port of the first three-position four-way reversing valve, the P port of the third three-position four-way reversing valve and the P port of the fifth three-position four-way reversing valve through one-way valves, and the A port and the T port of the fifth three-position four-way reversing valve are plugged, and the B port of the fifth three-position four-way reversing valve is communicated with the inlet of the cleaned pipeline group through the two-position three-way reversing valve.
Further, the second motor pump set comprises a second motor, a third plunger pump and a fourth plunger pump; the second motor is used for driving the third plunger pump, and the third motor is used for driving the fourth plunger pump; and the inlets of the third plunger pump and the fourth plunger pump are communicated with the oil tank, and the outlets of the third plunger pump and the fourth plunger pump are communicated with the inlet of the cleaned pipeline group through one-way valves.
Further, the third motor pump set comprises a fourth motor, a fifth plunger pump, a sixth plunger pump and a sixth three-position four-way reversing valve; the fourth motor is used for driving the fifth plunger pump and the sixth plunger pump simultaneously; the inlets of the fifth plunger pump and the sixth plunger pump are communicated with the oil tank, the outlets of the fifth plunger pump and the sixth plunger pump are communicated with the P port of the fourth three-position four-way reversing valve and the P port of the sixth three-position four-way reversing valve through one-way valves, and the A port and the T port of the sixth three-position four-way reversing valve are blocked, and the B port of the sixth three-position four-way reversing valve is directly communicated with the inlet of the cleaned pipeline group.
Furthermore, an unloading assembly is communicated between each plunger pump and the oil tank in parallel, the unloading assembly comprises a two-position four-way reversing valve and a pilot overflow valve, the two-position four-way reversing valve is electrically connected with the PLC control box, and the two-position four-way reversing valve is connected with a control oil way of the pilot overflow valve and used for controlling on-off of the pilot overflow valve.
The combination of the pilot overflow valve and the two-position four-way electromagnetic reversing valve is mainly used for back pressure and overpressure unloading, so that the risk of the hydraulic system when the rated pressure is exceeded is effectively reduced, and the hydraulic stability and the movement smoothness of the system are improved.
Further, the test system is also provided with a pressure monitoring component, the pressure monitoring component is electrically connected with the PLC control box, the outlet of each plunger pump and the connecting pipeline of the rod cavity and the rodless cavity of each oil cylinder are connected with the pressure monitoring component, and the pressure monitoring component comprises a pressure sensor and a pressure gauge.
The real-time hydraulic pressure of the component is monitored by the pressure monitoring component consisting of the pressure sensor and the pressure gauge, so that the overlarge hydraulic pressure is avoided, the safety risk of a hydraulic system is reduced, the pressure maintaining required value of each oil cylinder can be accurately obtained, and the accuracy of pressure maintaining and other tests is improved.
Further, the outlet of the cleaned pipeline group is connected with an oil tank through two serially connected oil return filters, and the oil tank is connected with an air filter.
During oil return, the oil passes through the oil return filter, so that impurities in the oil can be effectively removed, the cleanliness and the service life of the oil are improved, and the normal operation of the test platform is ensured. Meanwhile, the air filter can prevent particle pollutants from invading the system through the breathing port of the oil tank and prevent the particle pollutants from being mixed in the process of oiling.
The invention also provides a test method of the hydraulic test system, which comprises the following test processes;
and carrying out an ultra-high pressure rodless cavity pressure maintaining test on the oil cylinder through the ultra-high pressure test oil way, wherein the specific process is as follows:
the hydraulic oil of the oil tank is conveyed to the P port of the first three-position four-way reversing valve through the first motor pump group, the first three-position four-way reversing valve is electrified to be in the right position, so that the hydraulic oil flows out from the B port of the first three-position four-way reversing valve to reach the rodless cavity of the first oil cylinder, meanwhile, the P1 port of the ultrahigh pressure hydraulic station also charges the rodless cavity of the first oil cylinder, at the moment, the piston rod of the first oil cylinder stretches out, and as the control oil port of the second hydraulic control one-way valve is communicated with the oil supply path of the rod cavity of the first oil cylinder, the second hydraulic control one-way valve is reversely conducted, the hydraulic oil in the rod cavity of the first oil cylinder is extruded to flow to the B port of the second three-position four-way reversing valve through the second hydraulic control one-way valve, the second three-position four-way reversing valve is electrified to be in the right position, the hydraulic oil flows back to the oil return filter through the T port of the second three-position four-way reversing valve to be filtered, and the filtered hydraulic oil flows back to the oil tank; when the input rodless cavity oil pressure reaches a pressure maintaining required value, the P1 port of the ultrahigh pressure hydraulic station stops oil supply, meanwhile, the first three-position four-way reversing valve and the second three-position four-way reversing valve are both powered off and are in neutral position, the second hydraulic control one-way valve cannot be reversely conducted at the moment, the first oil cylinder is bidirectionally locked, a pressure maintaining test is started for a set time, and after the time reaches, the first three-position four-way reversing valve and the second three-position four-way reversing valve are both powered on and are in a right position, so that the second hydraulic control one-way valve is reversely conducted again, and the locking of the oil cylinder is relieved, so that the test is completed;
And carrying out a super-high pressure rod cavity pressure maintaining test on the oil cylinder through the super-high pressure test oil way, wherein the specific process is as follows:
the hydraulic oil of the oil tank is conveyed to the P port of the first three-position four-way reversing valve through the first motor pump group, the first three-position four-way reversing valve is electrified to be in the left position, so that the hydraulic oil flows out from the A port of the first three-position four-way reversing valve to reach the rod cavity of the first oil cylinder, meanwhile, the P2 port of the ultrahigh-pressure hydraulic station also charges the rod cavity of the first oil cylinder, at the moment, the piston rod of the first oil cylinder is retracted, and because the control oil port of the first hydraulic control one-way valve is communicated with the oil supply path of the rod cavity of the first oil cylinder, the first hydraulic control one-way valve is reversely conducted, the hydraulic oil without the rod cavity of the first oil cylinder is extruded to flow to the A port of the second three-position four-way reversing valve through the first hydraulic control one-way valve, the second three-position four-way reversing valve is electrified to be in the left position, the hydraulic oil flows back to the oil return filter through the T port of the second three-position four-way reversing valve to be filtered, and the filtered hydraulic oil flows back to the oil tank; when the input oil pressure of the rod cavity reaches a pressure maintaining required value, the P2 port of the ultrahigh pressure hydraulic station stops oil supply, meanwhile, the first three-position four-way reversing valve and the second three-position four-way reversing valve are both powered off and are in neutral position, at the moment, the first hydraulic control one-way valve cannot be reversely conducted, the first oil cylinder is bidirectionally locked, a pressure maintaining test is started for a set time, and after the time reaches, the first three-position four-way reversing valve and the second three-position four-way reversing valve are both powered on and are in left position, so that the first hydraulic control one-way valve is reversely conducted again, and the locking of the oil cylinder is relieved, so that the test is completed;
And carrying out a lowest starting pressure test on the oil cylinder through the first low-medium-high pressure test oil way, wherein the specific process is as follows:
the hydraulic oil of the oil tank is conveyed to a P port of a third three-position four-way reversing valve through a first motor pump group, the third three-position four-way reversing valve is electrified to be in a left position or a right position, so that the hydraulic oil flows out from an A port or a B port of the third three-position four-way reversing valve to reach a rodless cavity or a rod cavity of a second oil cylinder, a piston rod of the second oil cylinder stretches and contracts, and then the hydraulic oil in the rod cavity or the rodless cavity of the second oil cylinder is extruded to flow back to an oil return filter through a T port of the third three-position four-way reversing valve for filtering, and the filtered hydraulic oil flows back to the oil tank;
and carrying out a rodless cavity pressure maintaining test of low, medium and high pressures on the oil cylinder through the first low, medium and high pressure test oil way, wherein the specific process is as follows:
the hydraulic oil of the oil tank is conveyed to the P port of the third three-position four-way reversing valve through the first motor pump group, the third three-position four-way reversing valve is electrified to be at the left position, so that the hydraulic oil flows out from the A port of the third three-position four-way reversing valve, flows through the third hydraulic control one-way valve to reach the rodless cavity of the second oil cylinder, at the moment, the piston rod of the second oil cylinder stretches out, the control oil port of the fourth hydraulic control one-way valve is communicated with the rodless cavity oil supply path of the second oil cylinder, so that the fourth hydraulic control one-way valve is reversely conducted, the hydraulic oil in the rod cavity of the second oil cylinder is extruded to flow to the B port of the third three-position four-way reversing valve through the fourth hydraulic control one-way valve, flows to the oil return filter through the T port of the third three-position four-way reversing valve to be filtered, and the filtered hydraulic oil flows back to the oil tank; when the input rodless cavity oil pressure reaches a low pressure value, a medium pressure value or a high pressure value required by pressure maintaining, the third three-position four-way reversing valve is powered off and is in the middle position, at the moment, the fourth hydraulic control one-way valve cannot be reversely conducted, the second oil cylinder is bidirectionally locked, a pressure maintaining test is started for a set time, after the time is reached, the third three-position four-way reversing valve is powered on and is in the left position, the fourth hydraulic control one-way valve is reversely conducted again, the locking of the oil cylinder is released, and the test is completed;
And carrying out pressure maintaining tests of a rod cavity with low, medium and high pressure on the oil cylinder through the first low, medium and high pressure test oil way, wherein the specific process is as follows:
the hydraulic oil of the oil tank is conveyed to the P port of the third three-position four-way reversing valve through the first motor pump group, the third three-position four-way reversing valve is electrified to be at the right position, so that the hydraulic oil flows out from the B port of the third three-position four-way reversing valve, flows through the fourth hydraulic control one-way valve to reach the rod cavity of the second oil cylinder, at the moment, the piston rod of the second oil cylinder is retracted, the control oil port of the third hydraulic control one-way valve is communicated with the oil supply path of the rod cavity of the second oil cylinder, so that the third hydraulic control one-way valve is reversely conducted, the hydraulic oil of the rodless cavity of the second oil cylinder is extruded to flow to the A port of the third three-position four-way reversing valve through the third hydraulic control one-way valve, flows back to the oil return filter through the T port of the third three-position four-way reversing valve for filtering, and the filtered hydraulic oil flows back to the oil tank; when the input oil pressure of the rod cavity reaches a low pressure value, a medium pressure value or a high pressure value required by pressure maintaining, the third three-position four-way reversing valve is powered off and is in neutral position, at the moment, the third hydraulic control one-way valve cannot be reversely conducted, the second oil cylinder is bidirectionally locked, pressure maintaining test is started for set time, after the time is reached, the third three-position four-way reversing valve is powered on and is in the right position, the third hydraulic control one-way valve is reversely conducted again, the locking of the oil cylinder is released, and the test is completed;
The oil cylinder is cleaned through the flushing pipeline oil way, and the specific process is as follows:
the hydraulic oil of the oil tank is conveyed to the two-position three-way reversing valve through the first motor pump group, flows into the cleaned pipeline group through the two-position three-way reversing valve, is directly input into the cleaned pipeline group through the second motor pump group, and flows and cleans the cleaned pipeline group through the two paths of oil paths, wherein the two-position three-way reversing valve is electrified once every 5 seconds, the hydraulic oil input into the cleaned pipeline group is subjected to pulse action, and the hydraulic oil after being cleaned by the cleaned pipeline group is filtered by the oil return filter and flows back to the oil tank.
The beneficial effects of the invention are as follows:
the system comprises an ultrahigh pressure test oil way, a low-medium-high pressure test oil way and a flushing pipeline oil way, and can realize the working condition tests of 6 modes such as an ultrahigh pressure oil cylinder rodless cavity and rod cavity pressure maintaining test, a high-medium-low pressure oil cylinder rodless cavity and rod cavity pressure maintaining test, a flushing pipeline and a minimum starting pressure test, and the like, thereby effectively improving the utilization rate and the working efficiency. And through flushing pipeline test, can effectively clean hydraulic pressure pipeline, ensure test platform's normal operating, improve reliability and experimental accuracy.
Drawings
FIG. 1 is a hydraulic schematic of a hydraulic test system of the present invention;
FIG. 2 is a schematic diagram of hydraulic oil flow for a rodless chamber hold-up test with an oil cylinder at ultra-high pressure;
FIG. 3 is a schematic diagram of hydraulic oil flow for a rod chamber dwell test with an oil cylinder at ultra high pressure;
FIG. 4 is a schematic diagram of hydraulic oil flow for a low, medium, and high pressure rodless chamber dwell test with a cylinder;
FIG. 5 is a schematic diagram of hydraulic oil flow for a low, medium, and high pressure rod chamber dwell test of the cylinder;
FIG. 6 is a schematic illustration of hydraulic oil flow for cleaning a cylinder;
FIG. 7 is a hydraulic schematic of the hydraulic test system of the present invention in example 2;
in the figure: the hydraulic control system comprises a first oil cylinder 1, a first hydraulic control one-way valve 2, a second hydraulic control one-way valve 3, a first three-position four-way reversing valve 4, a second three-position four-way reversing valve 5, an oil return filter 6, a second oil cylinder 7, a third hydraulic control one-way valve 8, a fourth hydraulic control one-way valve 9, a third three-position four-way reversing valve 10, a fifth three-position four-way reversing valve 11, a two-position three-way reversing valve 12, a cleaned pipeline group 13, a first motor 14, a first plunger pump 15, a second plunger pump 16, a second motor 17, a third motor 18, a third plunger pump 19, a fourth plunger pump 20, an unloading assembly 21, a pressure monitoring assembly 22, an overflow valve 23, an air filter 24, a third oil cylinder 25, a fifth hydraulic control one-way valve 26, a sixth hydraulic control one-way valve 27, a fourth three-position four-way reversing valve 28, a fourth motor 29, a fifth plunger pump 30, a sixth plunger pump 31 and a sixth three-position four-way reversing valve 32.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationship depicted in the drawings is for illustrative purposes only and is not to be construed as limiting the present patent.
Example 1:
as shown in fig. 1, the hydraulic test system comprises an ultrahigh pressure test oil circuit, a first low-medium-high pressure test oil circuit, a flushing pipeline oil circuit, a first motor pump set and a second motor pump set;
the ultrahigh pressure test oil way comprises a first oil cylinder 1, a first hydraulic control one-way valve 2, a second hydraulic control one-way valve 3, a first three-position four-way reversing valve 4 and a second three-position four-way reversing valve 5; the port A of the first three-position four-way reversing valve 4 is communicated with a rod cavity of the first oil cylinder 1 through a one-way valve, the port B is communicated with a rodless cavity of the first oil cylinder 1 through a one-way valve, the port P is communicated with an oil tank through a first motor pump group, and the port T is connected with the oil tank through an oil return filter 6; the port A of the second three-position four-way reversing valve 5 is communicated with the rodless cavity of the first oil cylinder 1 through the first hydraulic control one-way valve 2, the port B is communicated with the rod cavity of the first oil cylinder 1 through the second hydraulic control one-way valve 3, the port P is closed, and the port T is connected with an oil tank through the oil return filter 6; the control oil ports of the first hydraulic control one-way valve 2 and the second hydraulic control one-way valve 3 are respectively communicated with a rod cavity and a rodless cavity of the first oil cylinder 1 to form a locking loop, and the first hydraulic control one-way valve 2 and the second hydraulic control one-way valve 3 realize on-off control through a pilot control oil way (a dotted oil way in the figure) communicated with an oil tank; the rod cavity and the rodless cavity of the first oil cylinder 1 are respectively communicated with the oil ports P1 and P2 of the ultrahigh-pressure hydraulic station;
The first low-medium-high pressure test oil way comprises a second oil cylinder 7, a third hydraulic control one-way valve 8, a fourth hydraulic control one-way valve 9 and a third three-position four-way reversing valve 10; the port A of the third three-position four-way reversing valve 10 is communicated with the rodless cavity of the second oil cylinder 7 through a third hydraulic control one-way valve 8, the port B is communicated with the rod cavity of the second oil cylinder 7 through a fourth hydraulic control one-way valve 9, the port P is communicated with an oil tank through a first motor pump group, and the port T is connected with the oil tank through an oil return filter 6; the control oil ports of the third hydraulic control one-way valve 8 and the fourth hydraulic control one-way valve 9 are respectively communicated with a rod cavity and a rodless cavity of the second oil cylinder 7 to form a locking loop, and the third hydraulic control one-way valve 8 and the fourth hydraulic control one-way valve 9 realize on-off control through a pilot control oil path communicated with an oil tank;
the flushing pipeline oil way comprises a two-position three-way reversing valve 12 and a cleaned pipeline group 13; the inlet of the first motor pump set is communicated with the oil tank, and the outlet is communicated with the inlet of the cleaned pipeline set 13 through the two-position three-way reversing valve 12; the inlet of the cleaned pipeline group 13 is also communicated with the oil tank through a second motor pump group, and the outlet of the cleaned pipeline group 13 is connected with the oil tank through an oil return filter 6;
the first three-position four-way reversing valve 4, the second three-position four-way reversing valve 5, the third three-position four-way reversing valve 10, the two-position three-way reversing valve 12, the first motor pump set and the second motor pump set are electrically connected with a PLC control box (not shown in the figure).
The first motor pump set comprises a first motor 14, a first plunger pump 15, a second plunger pump 16 and a fifth three-position four-way reversing valve 11; the first motor 14 is for driving the first plunger pump 15 and the second plunger pump 16 simultaneously; the inlets of the first plunger pump 15 and the second plunger pump 16 are communicated with an oil tank, the outlets are communicated with the P port of the first three-position four-way reversing valve 4, the P port of the third three-position four-way reversing valve 10 and the P port of the fifth three-position four-way reversing valve 11 through one-way valves, the A port and the T port of the fifth three-position four-way reversing valve 11 are plugged, and the B port is communicated with the inlet of the cleaned pipeline group 13 through the two-position three-way reversing valve 12; the second motor pump set comprises a second motor 17, a third motor 18, a third plunger pump 19 and a fourth plunger pump 20; the second motor 17 is used for driving the third plunger pump 19, and the third motor 18 is used for driving the fourth plunger pump 20; the inlets of the third plunger pump 19 and the fourth plunger pump 20 are communicated with the oil tank, and the outlets of the third plunger pump and the fourth plunger pump are communicated with the inlet of the cleaned pipeline group 13 through one-way valves.
In this embodiment, an unloading assembly 21 is connected in parallel between each plunger pump and the oil tank, and the unloading assembly 21 includes a two-position four-way reversing valve and a pilot overflow valve, where the two-position four-way reversing valve is electrically connected with the PLC control box, and the two-position four-way reversing valve is connected with a control oil path of the pilot overflow valve for controlling on-off of the pilot overflow valve. The combination of the pilot overflow valve and the two-position four-way electromagnetic reversing valve is mainly used for back pressure and overpressure unloading, so that the risk of the hydraulic system when the rated pressure is exceeded is effectively reduced, and the hydraulic stability and the movement smoothness of the system are improved. Before each test, the unloading assembly 21 at the corresponding place is started to perform the back pressure and overpressure unloading function.
In this embodiment, the test system is further provided with a pressure monitoring assembly 22, the pressure monitoring assembly 22 is electrically connected with the PLC control box, and the pressure monitoring assembly 22 is connected to the outlet of each plunger pump and the connecting lines of the rod cavity and the rodless cavity of each cylinder for monitoring pressure, and the pressure monitoring assembly 22 includes a pressure sensor and a pressure gauge. The output hydraulic pressure of the plunger pump is monitored through a pressure monitoring assembly 22 consisting of a pressure sensor and a pressure gauge, so that the overlarge output pressure is avoided, and the safety risk of a hydraulic system is reduced; and the oil pressure of the rod cavity and the rodless cavity can be monitored in real time, the pressure maintaining required value of each oil cylinder can be accurately obtained, and the accuracy of pressure maintaining and other tests is improved.
In this embodiment, both the rod cavity and the rodless cavity of the second oil cylinder 7 are communicated with an overflow valve 23, and the overflow valve 23 realizes on-off control through a pilot control oil path communicated with the oil tank. The relief valve 23 serves as a safety protection in the system. When the pressure of the system exceeds a specified value, the valve is opened, and part of gas in the system is discharged into the atmosphere, so that the pressure of the system does not exceed an allowable value, and the system is ensured not to have accidents due to the overhigh pressure.
In this embodiment, the outlet of the cleaned pipe group 13 is connected to the tank via two return filters 6 connected in series, and the tank is connected to an air cleaner 24. During oil return, the oil passes through the oil return filter 6, so that impurities in the oil can be effectively removed, the cleanliness and the service life of the oil are improved, and the normal operation of the test platform is ensured. At the same time, the air cleaner 24 not only prevents particulate contaminants from entering the system through the tank breathing port, but also prevents particulate contaminants from being mixed during refueling.
As shown in fig. 2-6, the present invention also provides a test method of the hydraulic test system, which comprises the following test procedures;
referring to fig. 2, the ultra-high pressure rodless cavity pressure maintaining test is performed on the oil cylinder through an ultra-high pressure test oil path, and the specific process is as follows:
starting a first motor 14, simultaneously enabling a two-position four-way electromagnetic reversing valve connected in parallel with a first plunger pump 15 or a second plunger pump 16 to be electrified, enabling the two-position four-way electromagnetic reversing valve to control a pilot overflow valve to play roles of back pressure and overpressure unloading, under the action of the motor, enabling hydraulic oil of an oil tank to be conveyed to a P port of a first three-position four-way reversing valve 4 through the first plunger pump 15 or the second plunger pump 16, enabling an electromagnet SV1 of the first three-position four-way reversing valve 4 to be electrified to be in a right position, enabling hydraulic oil to flow out from a B port of the first three-position four-way reversing valve 4 to reach a rodless cavity of the first oil tank 1, enabling a P1 port of an ultrahigh pressure hydraulic station to fill oil in the rodless cavity of the first oil tank 1, enabling a piston rod of the first oil tank 1 to extend out at the moment, enabling a control oil port of a second hydraulic control one-way valve 3 to be communicated with an oil supply channel of the rod cavity of the first oil tank 1 to be conducted reversely, enabling hydraulic oil of the rod cavity of the first oil tank 1 to be extruded to flow to a B port of the second three-position four-way reversing valve 5 through the second hydraulic one-way valve 3, enabling hydraulic oil of the rod cavity of the first oil tank 1 to be in a right position four-way valve 5 to be extruded, enabling hydraulic oil of the rod cavity of the second three-position four-way valve 5 to flow back to be filtered to be in a right position four-way through the four-way valve 5, and enabling hydraulic oil to be in a return to be in a position of a right position of the four-way valve to be filtered after being filtered by the hydraulic oil; when the pressure sensor detects that the input rodless cavity oil pressure reaches a pressure maintaining required value (set in a PLC control box before the test starts), the P1 port of the ultrahigh pressure hydraulic station stops oil supply, meanwhile, the first three-position four-way reversing valve 4 and the second three-position four-way reversing valve 5 are powered off and are in the middle position, the second hydraulic control one-way valve 3 cannot be reversely conducted at the moment, the first oil cylinder 1 is bidirectionally locked, the pressure maintaining test is started for a set time (set in the PLC control box before the test starts), after the time is reached, the electromagnet SV1 of the first three-position four-way reversing valve 4 and the electromagnet SV3 of the second three-position four-way reversing valve 5 are both electrified and are in the right position, so that the second hydraulic control one-way valve 3 is reversely conducted again, the oil cylinder locking is released, and the test is completed;
Referring to fig. 3, the pressure maintaining test of the rod cavity of the ultrahigh pressure is performed on the oil cylinder through the ultrahigh pressure test oil way, and the specific process is as follows:
starting a first motor 14, simultaneously enabling a two-position four-way electromagnetic reversing valve connected in parallel with a first plunger pump 15 or a second plunger pump 16 to be electrified, enabling the two-position four-way electromagnetic reversing valve to control a pilot overflow valve to play roles of back pressure and overpressure unloading, under the action of the motor, enabling hydraulic oil of an oil tank to be conveyed to a P port of a first three-position four-way reversing valve 4 through the first plunger pump 15 or the second plunger pump 16, enabling an electromagnet SV2 of the first three-position four-way reversing valve 4 to be electrified to be left, enabling the hydraulic oil to flow out from an A port of the first three-position four-way reversing valve 4 to reach a rod cavity of the first oil tank 1, enabling a P2 port of an ultrahigh pressure hydraulic station to fill oil into the rod cavity of the first oil tank 1, enabling a piston rod of the first oil tank 1 to retract at the moment, enabling hydraulic oil of a control oil port of the first hydraulic one-way valve 2 to be communicated with an oil supply passage of the rod cavity of the first oil tank 1 to be reversely conducted, enabling hydraulic oil of a rodless cavity of the first hydraulic oil tank 1 to be extruded to flow to an A port of a second three-position four-way reversing valve 5 through the first hydraulic one-way valve 2, enabling hydraulic oil of the rodless cavity of the first hydraulic oil to be in the four-way valve 5 to be in a left position four-way valve 5, enabling hydraulic oil of the hydraulic oil to flow back through the four-way valve 5 to be filtered by the four-way valve 5 to be left in a position four-way valve 6 after being subjected to filtering and the hydraulic oil is subjected to reflux; when the pressure sensor detects that the input oil pressure of the rod cavity reaches a pressure maintaining required value, the P2 port of the ultrahigh pressure hydraulic station stops oil supply, meanwhile, the first three-position four-way reversing valve 4 and the second three-position four-way reversing valve 5 are powered off and are positioned in the middle, the first hydraulic control one-way valve 2 cannot be reversely conducted, the first oil cylinder 1 is bidirectionally locked, a pressure maintaining test is started for a set time, after the time reaches, the electromagnet SV2 of the first three-position four-way reversing valve 4 and the electromagnet SV4 of the second three-position four-way reversing valve 5 are both electrified and positioned in the left position, so that the first hydraulic control one-way valve 2 is reversely conducted again, the locking of the oil cylinder is released, and the test is completed;
The oil cylinder is subjected to a lowest starting pressure test through a first low-medium-high pressure test oil way, and the specific process is as follows:
starting a first motor 14, simultaneously enabling a two-position four-way electromagnetic reversing valve connected in parallel with a first plunger pump 15 or a second plunger pump 16 to be electrified, enabling the two-position four-way electromagnetic reversing valve to control a pilot overflow valve to play roles of back pressure and overpressure unloading, under the action of the motor, enabling hydraulic oil of an oil tank to be conveyed to a P port of a third three-position four-way reversing valve 10 through the first plunger pump 15 or the second plunger pump 16, enabling an electromagnet SV6 or an SV5 of the third three-position four-way reversing valve 10 to be electrified to be left or right, enabling the hydraulic oil to flow out from an A port or a B port of the third three-position four-way reversing valve 10 to reach a rodless cavity or a rod cavity of a second oil cylinder 7, enabling a piston rod of the second oil cylinder 7 to stretch out and draw back, and enabling hydraulic oil of the rod cavity or the rodless cavity of the second oil cylinder 7 to flow back to an oil return filter 6 for filtering through a T port of the third three-position four-way reversing valve 10 (because the lowest starting pressure test is carried out through a first low-middle-high-pressure test oil path, compared with a rodless middle-high-pressure rodless cavity or rod cavity pressure maintaining test, the pressure maintaining is less, the flowing direction of the low-middle-pressure high-pressure rod cavity or the rod cavity is contained in the low-pressure test fluid is a rod or the rod 5, and the rod-free cavity is contained in the high-pressure test cavity or the high-pressure test fluid, and the rod is stretched out and the rod cavity 4 and the test cavity 4 is stretched out and the process 4;
Referring to fig. 4, the first low-medium-high pressure test oil way is used for performing a rodless cavity pressure maintaining test of low, medium and high pressures on the oil cylinder, and the specific process is as follows:
starting a first motor 14, simultaneously enabling a two-position four-way electromagnetic reversing valve connected in parallel with a first plunger pump 15 or a second plunger pump 16 to be electrified, enabling the two-position four-way electromagnetic reversing valve to control a pilot type overflow valve to play roles of back pressure and overpressure unloading, under the action of the motor, enabling hydraulic oil of an oil tank to be conveyed to a P port of a third three-position four-way reversing valve 10 through the first plunger pump 15 or the second plunger pump 16, enabling an electromagnet SV6 of the third three-position four-way reversing valve 10 to be electrified to be left, enabling the hydraulic oil to flow out of an A port of the third three-position four-way reversing valve 10 and reach a rodless cavity of a second oil tank 7 through a third hydraulic control one-way valve 8, enabling a piston rod of the second oil tank 7 to extend out, enabling a control oil port of the fourth hydraulic control one-way valve 9 to be communicated with a rodless cavity oil supply path of the second oil tank 7, enabling the hydraulic oil of the fourth hydraulic control one-way valve 9 to be conducted reversely, enabling the hydraulic oil of the rod cavity of the second oil tank 7 to flow to a B port of the third three-position four-way reversing valve 10 through the fourth hydraulic control one-way valve 9, enabling the hydraulic oil to flow to a T port of the third three-position four-way reversing valve 10 to be in a left position, enabling the hydraulic oil to flow to a rodless cavity 6 to be filtered, and then enabling the hydraulic oil to flow back to the filtered oil tank to be filtered; when the pressure sensor detects that the input rodless cavity oil pressure reaches a low pressure value, a medium pressure value or a high pressure value required by pressure maintaining, the third three-position four-way reversing valve 10 is powered off and is in the middle position, the fourth hydraulic control one-way valve 9 cannot be reversely conducted at the moment, the second oil cylinder 7 is bidirectionally locked, a pressure maintaining test is started for a set time, after the time reaches, the electromagnet SV6 of the third three-position four-way reversing valve 10 is powered on and is in the left position, the fourth hydraulic control one-way valve 9 is reversely conducted again, the locking of the oil cylinder is released, and the test is completed;
Referring to fig. 5, the hydraulic cylinder is subjected to a pressure maintaining test of a rod cavity with low, medium and high pressure through a first low, medium and high pressure test oil way, and the specific process is as follows:
starting a first motor 14, simultaneously enabling a two-position four-way electromagnetic reversing valve connected in parallel with a first plunger pump 15 or a second plunger pump 16 to be electrified, enabling the two-position four-way electromagnetic reversing valve to control a pilot type overflow valve to play roles of back pressure and overpressure unloading, under the action of the motor, enabling hydraulic oil of an oil tank to be conveyed to a P port of a third three-position four-way reversing valve 10 through the first plunger pump 15 or the second plunger pump 16, enabling an electromagnet SV5 of the third three-position four-way reversing valve 10 to be electrified to be in a right position, enabling the hydraulic oil to flow out of a B port of the third three-position four-way reversing valve 10 and reach a rod cavity of a second oil tank 7 through a fourth hydraulic control one-way valve 9, enabling a piston rod of the second oil tank 7 to retract, enabling the hydraulic oil of the third hydraulic control one-way valve 8 to be communicated with an oil cavity of the second oil tank 7, enabling hydraulic oil of a rodless cavity of the second oil tank 7 to be reversely conducted, enabling hydraulic oil of the second oil to flow to an A port of the third three-position four-way reversing valve 10 through the third hydraulic control one-way valve 8 to flow back to an oil return filter 6 through a T port of the third three-position four-way reversing valve 10, and filtering the hydraulic oil after filtering is carried out to return to the oil tank; when the pressure sensor detects that the input oil pressure of the rod cavity reaches a low pressure value, a medium pressure value or a high pressure value required by pressure maintaining, the third three-position four-way reversing valve 10 is powered off and is in the middle position, at the moment, the third hydraulic control one-way valve 8 cannot be reversely conducted, the second oil cylinder 7 is locked in a two-way mode, a pressure maintaining test is started for a set time, after the time is reached, the electromagnet SV5 of the third three-position four-way reversing valve 10 is powered on and is in the right position, the third hydraulic control one-way valve 8 is reversely conducted again, the locking of the oil cylinder is released, and the test is completed;
Referring to fig. 6, the oil cylinder is cleaned through the flushing pipeline oil path, and the specific process is as follows:
starting a first motor 14, simultaneously powering on a two-position four-way electromagnetic reversing valve connected in parallel with a first plunger pump 15 or a second plunger pump 16, controlling a pilot overflow valve to play roles of back pressure and overpressure unloading, under the action of the motor, conveying hydraulic oil of an oil tank to a P port of a fifth three-position four-way reversing valve 11 through the first plunger pump 15 or the second plunger pump 16, powering on an electromagnet SV7 of the fifth three-position four-way reversing valve 11 to be in a right position, and enabling the hydraulic oil to flow out from a B port of the fifth three-position four-way reversing valve 11 to flow into a cleaned pipeline group 13 through the two-position three-way reversing valve 12; simultaneously starting a second motor 17 and a third motor 18, and enabling a two-position four-way electromagnetic reversing valve connected in parallel with a third plunger pump 19 or a fourth plunger pump 20 to be electrified, so that the two-position four-way electromagnetic reversing valve controls a pilot overflow valve to play roles in back pressure and overpressure unloading, and under the action of the motors, hydraulic oil of an oil tank is directly input into a cleaned pipeline group 13 through the third plunger pump 19 and the fourth plunger pump 20; the two paths of the oil paths simultaneously carry out flow cleaning on the cleaned pipeline group 13, wherein the two-position three-way reversing valve 12 is electrified once every 5 seconds, the pulse action is carried out on the hydraulic oil input into the cleaned pipeline group 13, and the hydraulic oil cleaned by the cleaned pipeline group 13 is filtered by the oil return filter 6 and then flows back to the oil tank.
The on-off of the related components is controlled by a PLC control box.
Example 2:
as shown in fig. 7, this embodiment is different from embodiment 1 in that the system is further provided with a second low-medium-high-voltage test oil path and a third motor pump set;
the second low-medium-high pressure test oil way comprises a third oil cylinder 25, a fifth hydraulic control one-way valve 26, a sixth hydraulic control one-way valve 27 and a fourth three-position four-way reversing valve 28; the port A of the fourth three-position four-way reversing valve 28 is communicated with the rodless cavity of the third oil cylinder 25 through the fifth hydraulic control one-way valve 26, the port B is communicated with the rod cavity of the third oil cylinder 25 through the sixth hydraulic control one-way valve 27, the port P is communicated with an oil tank through a third motor pump group, and the port T is connected with the oil tank through an oil return filter 6; the control oil ports of the fifth hydraulic control check valve 26 and the sixth hydraulic control check valve 27 are respectively communicated with a rod cavity and a rodless cavity of the third oil cylinder 25 to form a locking loop, and the fifth hydraulic control check valve 26 and the sixth hydraulic control check valve 27 realize on-off control through a pilot control oil path communicated with an oil tank.
The third motor pump set comprises a fourth motor 29, a fifth plunger pump 30, a sixth plunger pump 31 and a sixth three-position four-way reversing valve 32; the fourth motor 29 is for driving the fifth plunger pump 30 and the sixth plunger pump 31 simultaneously; the inlets of the fifth plunger pump 30 and the sixth plunger pump 31 are communicated with the oil tank, the outlets are communicated with the P port of the fourth three-position four-way reversing valve 28 and the P port of the sixth three-position four-way reversing valve 32 through one-way valves, the A port and the T port of the sixth three-position four-way reversing valve 32 are blocked, and the B port is directly communicated with the inlet of the cleaned pipeline group 13.
In this embodiment, a second low-medium-high pressure test oil path is added in parallel, so that a pressure maintaining test of a rod cavity or a rodless cavity with different low-medium-high pressure can be performed on two oil cylinders, and the principle is the same as that of the first low-medium-high pressure test oil path, and will not be described. According to the invention, the oil supply path provided by the third motor pump set and additionally arranged in the parallel second low-medium-high-pressure test oil path is simultaneously converged into the oil path of the washed pipeline set 13, so that the more the motor pump sets which are connected in parallel are combined with the low-medium-high-pressure test oil path, the higher the washing pressure of a washing pipeline test is, and the higher the washing efficiency is.
The system can be provided with a plurality of combinations of the low-medium-high pressure test oil ways and the motor pump sets in parallel, and the additionally arranged combinations can be used for carrying out batch test on a plurality of oil cylinders, so that the test efficiency is further improved, the system is suitable for the requirements of measuring different working conditions of the plurality of oil cylinders at the same time, and the response speed of external service can be effectively improved.
It is to be understood that the above examples of the present invention are provided by way of illustration only and are not intended to limit the scope of the invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

1. The hydraulic test system is characterized by comprising an ultrahigh pressure test oil circuit, a first low-medium-high pressure test oil circuit, a flushing pipeline oil circuit, a first motor pump set and a second motor pump set;
the ultrahigh pressure test oil way comprises a first oil cylinder (1), a first hydraulic control one-way valve (2), a second hydraulic control one-way valve (3), a first three-position four-way reversing valve (4) and a second three-position four-way reversing valve (5); an A port of the first three-position four-way reversing valve (4) is communicated with a rod cavity of the first oil cylinder (1) through a one-way valve, a B port of the first three-position four-way reversing valve is communicated with a rodless cavity of the first oil cylinder (1) through a one-way valve, a P port of the first three-position four-way reversing valve is communicated with an oil tank through a first motor pump group, and a T port of the first three-position four-way reversing valve is connected with the oil tank through an oil return filter (6); an A port of the second three-position four-way reversing valve (5) is communicated with a rodless cavity of the first oil cylinder (1) through the first hydraulic control one-way valve (2), a B port of the second three-position four-way reversing valve is communicated with a rod cavity of the first oil cylinder (1) through the second hydraulic control one-way valve (3), a P port of the second three-position four-way reversing valve is closed, and a T port of the second three-position four-way reversing valve is connected with an oil tank through an oil return filter (6); the control oil ports of the first hydraulic control one-way valve (2) and the second hydraulic control one-way valve (3) are respectively communicated with a rod cavity and a rodless cavity of the first oil cylinder (1) to form a locking loop, and the first hydraulic control one-way valve (2) and the second hydraulic control one-way valve (3) realize on-off control through a pilot control oil path communicated with an oil tank; the rod cavity and the rodless cavity of the first oil cylinder (1) are respectively communicated with the P1 and P2 oil ports of the ultrahigh-pressure hydraulic station;
The first low-medium-high pressure test oil way comprises a second oil cylinder (7), a third hydraulic control one-way valve (8), a fourth hydraulic control one-way valve (9) and a third three-position four-way reversing valve (10); an A port of the third three-position four-way reversing valve (10) is communicated with a rodless cavity of the second oil cylinder (7) through the third hydraulic control one-way valve (8), a B port of the third three-position four-way reversing valve is communicated with a rod cavity of the second oil cylinder (7) through the fourth hydraulic control one-way valve (9), a P port of the third three-position four-way reversing valve is communicated with an oil tank through the first motor pump group, and a T port of the third three-position four-way reversing valve is connected with the oil tank through an oil return filter (6); the control oil ports of the third hydraulic control one-way valve (8) and the fourth hydraulic control one-way valve (9) are respectively communicated with a rod cavity and a rodless cavity of the second oil cylinder (7) to form a locking loop, and the third hydraulic control one-way valve (8) and the fourth hydraulic control one-way valve (9) realize on-off control through a pilot control oil path communicated with an oil tank;
the flushing pipeline oil way comprises a two-position three-way reversing valve (12) and a cleaned pipeline group (13); the inlet of the first motor pump set is communicated with the oil tank, the outlet of the first motor pump set is communicated with the inlet of the cleaned pipeline set (13) through the two-position three-way reversing valve (12), the inlet of the cleaned pipeline set (13) is also communicated with the oil tank through the second motor pump set, and the outlet of the cleaned pipeline set (13) is connected with the oil tank through an oil return filter (6);
The first three-position four-way reversing valve (4), the second three-position four-way reversing valve (5), the third three-position four-way reversing valve (10), the two-position three-way reversing valve (12), the first motor pump set and the second motor pump set are electrically connected with the PLC control box.
2. The hydraulic test system according to claim 1, wherein the system is provided with a second low-medium-high pressure test oil circuit and a third motor pump unit;
the second low-medium-high pressure test oil way comprises a third oil cylinder (25), a fifth hydraulic control one-way valve (26), a sixth hydraulic control one-way valve (27) and a fourth three-position four-way reversing valve (28); an A port of the fourth three-position four-way reversing valve (28) is communicated with a rod cavity of the third oil cylinder (25) through the fifth hydraulic control one-way valve (26), a B port of the fourth three-position four-way reversing valve is communicated with a rodless cavity of the third oil cylinder (25) through the sixth hydraulic control one-way valve (27), a P port of the fourth three-position four-way reversing valve is communicated with an oil tank through the third motor pump group, and a T port of the fourth three-position four-way reversing valve is connected with the oil tank through an oil return filter (6); the control oil ports of the fifth hydraulic control one-way valve (26) and the sixth hydraulic control one-way valve (27) are respectively communicated with a rod cavity and a rodless cavity of the third oil cylinder (25) to form a locking loop, and the fifth hydraulic control one-way valve (26) and the sixth hydraulic control one-way valve (27) realize on-off control through a pilot control oil path communicated with an oil tank.
3. The hydraulic test system according to claim 2, wherein the rod cavities and the rodless cavities of the second oil cylinder (7) and the third oil cylinder (25) are respectively communicated with an overflow valve (23), and the overflow valve (23) realizes on-off control through a pilot control oil path communicated with an oil tank.
4. The hydraulic test system according to claim 2, wherein the first motor-pump stack comprises a first motor (14), a first plunger pump (15), a second plunger pump (16), a fifth three-position four-way reversing valve (11); the first motor (14) is used for driving the first plunger pump (15) and the second plunger pump (16) simultaneously; the inlets of the first plunger pump (15) and the second plunger pump (16) are communicated with an oil tank, the outlets of the first plunger pump (15) and the second plunger pump (16) are communicated with the P port of the first three-position four-way reversing valve (4), the P port of the third three-position four-way reversing valve (10) and the P port of the fifth three-position four-way reversing valve (11) through one-way valves, and the A port and the T port of the fifth three-position four-way reversing valve (11) are plugged, and the B port of the fifth three-position four-way reversing valve is communicated with the inlet of the cleaned pipeline group (13) through the two-position three-way reversing valve (12).
5. The hydraulic test system of claim 4, wherein the second motor-pump stack comprises a second motor (17), a third motor (18), a third plunger pump (19), a fourth plunger pump (20); -said second motor (17) is for driving said third plunger pump (19), said third motor (18) being for driving said fourth plunger pump (20); the inlets of the third plunger pump (19) and the fourth plunger pump (20) are communicated with the oil tank, and the outlets of the third plunger pump and the fourth plunger pump are communicated with the inlet of the cleaned pipeline group (13) through one-way valves.
6. The hydraulic test system of claim 5, wherein the third motor-pump stack comprises a fourth motor (29), a fifth plunger pump (30), a sixth plunger pump (31), a sixth three-position four-way reversing valve (32); the fourth motor (29) is used for driving the fifth plunger pump (30) and the sixth plunger pump (31) simultaneously; the inlets of the fifth plunger pump (30) and the sixth plunger pump (31) are communicated with an oil tank, the outlets of the fifth plunger pump and the sixth plunger pump are communicated with the P port of the fourth three-position four-way reversing valve (28) and the P port of the sixth three-position four-way reversing valve (32) through one-way valves, and the A port and the T port of the sixth three-position four-way reversing valve (32) are plugged, and the B port of the sixth three-position four-way reversing valve is directly communicated with the inlet of the cleaned pipeline group (13).
7. The hydraulic test system according to claim 6, wherein an unloading assembly (21) is communicated in parallel between each plunger pump and the oil tank, the unloading assembly (21) comprises a two-position four-way reversing valve and a pilot overflow valve, the two-position four-way reversing valve is electrically connected with the PLC control box, and the two-position four-way reversing valve is connected with a control oil circuit of the pilot overflow valve and is used for controlling on-off of the pilot overflow valve.
8. The hydraulic test system according to claim 6, further comprising a pressure monitoring assembly (22), wherein the pressure monitoring assembly (22) is electrically connected to the PLC control box, the pressure monitoring assembly (22) is connected to the outlet of each plunger pump and to the connecting lines of the rod-shaped cavity and the rodless cavity of each cylinder, and the pressure monitoring assembly comprises a pressure sensor and a pressure gauge.
9. Hydraulic test system according to claim 1, characterized in that the outlet of the cleaned pipe group (13) is connected to the tank via two return filters (6) connected in series, and that the tank is connected to an air filter (24).
10. A method of testing a hydraulic test system according to any one of claims 1-9, comprising the following test procedures;
and carrying out an ultra-high pressure rodless cavity pressure maintaining test on the oil cylinder through the ultra-high pressure test oil way, wherein the specific process is as follows:
the hydraulic oil of the oil tank is conveyed to a P port of a first three-position four-way reversing valve (4) through a first motor pump group, the first three-position four-way reversing valve (4) is electrified to be in a right position, so that the hydraulic oil flows out from a B port of the first three-position four-way reversing valve (4) to reach a rodless cavity of a first oil cylinder (1), meanwhile, the P1 port of an ultrahigh-pressure hydraulic station also charges oil in the rodless cavity of the first oil cylinder (1), at the moment, a piston rod of the first oil cylinder (1) stretches out, and because a control oil port of a second hydraulic control one-way valve (3) is communicated with an oil supply path of a rod cavity of the first oil cylinder (1), the second hydraulic control one-way valve (3) is reversely conducted, the hydraulic oil in the rod cavity of the first oil cylinder (1) is extruded to flow to a B port of a second three-position four-way reversing valve (5) through the second hydraulic control one-way valve (3), the second three-position four-way reversing valve (5) is electrified to be in a right position, and the hydraulic oil flows back to an oil return filter (6) through a T port of the second three-position four-way reversing valve (5), and the filtered hydraulic oil returns to the oil tank; when the input rodless cavity oil pressure reaches a pressure maintaining required value, the P1 port of the ultrahigh pressure hydraulic station stops oil supply, meanwhile, the first three-position four-way reversing valve (4) and the second three-position four-way reversing valve (5) are powered off and are positioned in the middle, the second hydraulic control one-way valve (3) cannot be reversely conducted, the first oil cylinder (1) is bidirectionally locked, a pressure maintaining test is started for a set time, after the time reaches, the first three-position four-way reversing valve (4) and the second three-position four-way reversing valve (5) are powered on and are positioned in the right position, so that the second hydraulic control one-way valve (3) is reversely conducted again, the locking of the oil cylinder is released, and the test is completed;
And carrying out a super-high pressure rod cavity pressure maintaining test on the oil cylinder through the super-high pressure test oil way, wherein the specific process is as follows:
the hydraulic oil of the oil tank is conveyed to a P port of a first three-position four-way reversing valve (4) through a first motor pump group, the first three-position four-way reversing valve (4) is electrified to be at a left position, so that the hydraulic oil flows out from an A port of the first three-position four-way reversing valve (4) to reach a rod cavity of a first oil cylinder (1), meanwhile, a P2 port of an ultrahigh-pressure hydraulic station also charges oil in the rod cavity of the first oil cylinder (1), at the moment, a piston rod of the first oil cylinder (1) is retracted, and because a control oil port of the first hydraulic control one-way valve (2) is communicated with an oil supply path of the rod cavity of the first oil cylinder (1), the hydraulic oil of a rodless cavity of the first oil cylinder (1) is extruded to flow to an A port of a second three-position four-way reversing valve (5) through the first hydraulic control one-way valve (2), the second three-way reversing valve (5) is electrified to be at a left position, and the hydraulic oil flows back to a filter (6) through a T port of the second three-position four-way reversing valve (5) for filtering, and the filtered hydraulic oil flows back to the oil tank; when the input oil pressure of the rod cavity reaches a pressure maintaining required value, the P2 port of the ultrahigh pressure hydraulic station stops oil supply, meanwhile, the first three-position four-way reversing valve (4) and the second three-position four-way reversing valve (5) are powered off and are positioned in the middle, at the moment, the first hydraulic control one-way valve (2) cannot be reversely conducted, the first oil cylinder (1) is bidirectionally locked, a pressure maintaining test is started for a set time, after the time reaches, the first three-position four-way reversing valve (4) and the second three-position four-way reversing valve (5) are powered on and are positioned in the left position, so that the first hydraulic control one-way valve (2) is reversely conducted again, the locking of the oil cylinder is released, and the test is completed;
And carrying out a lowest starting pressure test on the oil cylinder through the first low-medium-high pressure test oil way, wherein the specific process is as follows:
the hydraulic oil of the oil tank is conveyed to a P port of a third three-position four-way reversing valve (10) through a first motor pump group, the third three-position four-way reversing valve (10) is electrified to be in a left position or a right position, so that the hydraulic oil flows out from an A port or a B port of the third three-position four-way reversing valve (10) to reach a rodless cavity or a rod cavity of a second oil cylinder (7), a piston rod of the second oil cylinder (7) stretches out and draws back, and then the hydraulic oil with the rod cavity or the rodless cavity of the second oil cylinder (7) is extruded to flow back to an oil return filter (6) through a T port of the third three-position four-way reversing valve (10) for filtering, and the filtered hydraulic oil flows back to the oil tank;
and carrying out a rodless cavity pressure maintaining test of low, medium and high pressures on the oil cylinder through the first low, medium and high pressure test oil way, wherein the specific process is as follows:
the hydraulic oil of the oil tank is conveyed to a P port of a third three-position four-way reversing valve (10) through a first motor pump group, the third three-position four-way reversing valve (10) is electrified to be in a left position, so that the hydraulic oil flows out from an A port of the third three-position four-way reversing valve (10) to reach a rodless cavity of a second oil cylinder (7) through a third hydraulic control one-way valve (8), at the moment, a piston rod of the second oil cylinder (7) stretches out, a control oil port of a fourth hydraulic control one-way valve (9) is communicated with an oil supply path of the rodless cavity of the second oil cylinder (7), the fourth hydraulic control one-way valve (9) is reversely conducted, the hydraulic oil with the rod cavity of the second oil cylinder (7) is extruded to flow to a B port of the third three-position four-way reversing valve (10) through a T port of the third three-position four-way reversing valve (10) to be filtered, and the filtered hydraulic oil flows back to the oil tank; when the input rodless cavity oil pressure reaches a low pressure value, a medium pressure value or a high pressure value required by pressure maintaining, the third three-position four-way reversing valve (10) is powered off and is in neutral position, the fourth hydraulic control one-way valve (9) cannot be reversely conducted at the moment, the second oil cylinder (7) is locked in a two-way mode, pressure maintaining test is started for a set time, after the time reaches, the third three-position four-way reversing valve (10) is powered on and is in a left position, the fourth hydraulic control one-way valve (9) is reversely conducted again, the locking of the oil cylinder is released, and the test is completed;
And carrying out pressure maintaining tests of a rod cavity with low, medium and high pressure on the oil cylinder through the first low, medium and high pressure test oil way, wherein the specific process is as follows:
the hydraulic oil of the oil tank is conveyed to a P port of a third three-position four-way reversing valve (10) through a first motor pump group, the third three-position four-way reversing valve (10) is electrified to be in a right position, so that the hydraulic oil flows out from a B port of the third three-position four-way reversing valve (10) to reach a rod cavity of a second oil cylinder (7) through a fourth hydraulic control one-way valve (9), at the moment, a piston rod of the second oil cylinder (7) is retracted, a control oil port of the third hydraulic control one-way valve (8) is communicated with an oil supply path of the rod cavity of the second oil cylinder (7), the third hydraulic control one-way valve (8) is reversely conducted, the hydraulic oil of a rodless cavity of the second oil cylinder (7) is extruded to flow to an A port of the third three-position four-way reversing valve (10) through the third hydraulic control one-way valve (8), and flows back to an oil return filter (6) through a T port of the third three-position four-way reversing valve (10) for filtering, and the filtered hydraulic oil flows back to the oil tank; when the input oil pressure of the rod cavity reaches a low pressure value, a medium pressure value or a high pressure value required by pressure maintaining, the third three-position four-way reversing valve (10) is powered off and is in neutral position, at the moment, the third hydraulic control one-way valve (8) cannot be reversely conducted, the second oil cylinder (7) is locked in a two-way mode, pressure maintaining test is started for a set time, after the time is reached, the third three-position four-way reversing valve (10) is powered on and is in a right position, the third hydraulic control one-way valve (8) is reversely conducted again, the locking of the oil cylinder is released, and the test is completed;
The oil cylinder is cleaned through the flushing pipeline oil way, and the specific process is as follows:
the hydraulic oil of the oil tank is conveyed to the two-position three-way reversing valve (12) through the first motor pump group, flows into the cleaned pipeline group (13) through the two-position three-way reversing valve (12), is directly input into the cleaned pipeline group (13) through the second motor pump group, and flows and cleans the cleaned pipeline group (13) through two paths of oil paths, wherein the two-position three-way reversing valve (12) is electrified once every 5 seconds, the hydraulic oil input into the cleaned pipeline group (13) is subjected to pulse action, and the hydraulic oil cleaned by the cleaned pipeline group (13) is filtered by the oil return filter (6) and flows back to the oil tank.
CN202111417001.2A 2021-11-19 2021-11-19 Hydraulic test system and test method Active CN114060355B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111417001.2A CN114060355B (en) 2021-11-19 2021-11-19 Hydraulic test system and test method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111417001.2A CN114060355B (en) 2021-11-19 2021-11-19 Hydraulic test system and test method

Publications (2)

Publication Number Publication Date
CN114060355A CN114060355A (en) 2022-02-18
CN114060355B true CN114060355B (en) 2023-05-30

Family

ID=80276263

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111417001.2A Active CN114060355B (en) 2021-11-19 2021-11-19 Hydraulic test system and test method

Country Status (1)

Country Link
CN (1) CN114060355B (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204646867U (en) * 2015-05-19 2015-09-16 湖南佳星液压机械制造有限公司 A kind of hydraulic system of cylinder bench
CN106769122A (en) * 2015-11-23 2017-05-31 璧典凯 A kind of hydraulic support tests automatic measuring and controlling system
CN206770321U (en) * 2017-05-18 2017-12-19 湖北精功科技有限公司 A kind of Multifunctional comprehensive type hydraulic test bench
CN206889394U (en) * 2017-05-16 2018-01-16 蚌埠液力机械有限公司 A kind of hydraulic cylinder durability testing stand
WO2018040460A1 (en) * 2016-08-31 2018-03-08 陈波 Electric serving ultra-high-pressure system and operation principle thereof
CN110608215A (en) * 2019-09-03 2019-12-24 江苏恒立液压科技有限公司 Hydraulic system for hydraulic cylinder performance test and test method
CN110905887A (en) * 2019-10-30 2020-03-24 润琛液压机械南通有限公司 High-voltage and ultrahigh-voltage combined test board
CN210829938U (en) * 2019-10-21 2020-06-23 西安庆安航空试验设备有限责任公司 Ultrahigh pressure hydraulic test device
CN112443538A (en) * 2020-12-10 2021-03-05 徐州徐工液压件有限公司 Hydraulic system of supporting leg hydraulic cylinder simulated working condition test bed and test method
CN112827956A (en) * 2021-01-05 2021-05-25 中车青岛四方车辆研究所有限公司 Multifunctional hydraulic brake pipeline cleaning device

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204646867U (en) * 2015-05-19 2015-09-16 湖南佳星液压机械制造有限公司 A kind of hydraulic system of cylinder bench
CN106769122A (en) * 2015-11-23 2017-05-31 璧典凯 A kind of hydraulic support tests automatic measuring and controlling system
WO2018040460A1 (en) * 2016-08-31 2018-03-08 陈波 Electric serving ultra-high-pressure system and operation principle thereof
CN206889394U (en) * 2017-05-16 2018-01-16 蚌埠液力机械有限公司 A kind of hydraulic cylinder durability testing stand
CN206770321U (en) * 2017-05-18 2017-12-19 湖北精功科技有限公司 A kind of Multifunctional comprehensive type hydraulic test bench
CN110608215A (en) * 2019-09-03 2019-12-24 江苏恒立液压科技有限公司 Hydraulic system for hydraulic cylinder performance test and test method
CN210829938U (en) * 2019-10-21 2020-06-23 西安庆安航空试验设备有限责任公司 Ultrahigh pressure hydraulic test device
CN110905887A (en) * 2019-10-30 2020-03-24 润琛液压机械南通有限公司 High-voltage and ultrahigh-voltage combined test board
CN112443538A (en) * 2020-12-10 2021-03-05 徐州徐工液压件有限公司 Hydraulic system of supporting leg hydraulic cylinder simulated working condition test bed and test method
CN112827956A (en) * 2021-01-05 2021-05-25 中车青岛四方车辆研究所有限公司 Multifunctional hydraulic brake pipeline cleaning device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
曲征辉.液压缸型式试验台系统与结构分析及控制特性研究.CNKI优秀硕士学位论文全文库机械电子工程专业.2012,(2012年第7期),全文. *

Also Published As

Publication number Publication date
CN114060355A (en) 2022-02-18

Similar Documents

Publication Publication Date Title
US9429231B2 (en) Flushing circuit for hydraulic cylinder drive circuit
US6932902B2 (en) Hydraulic oil filtration apparatus
US7441406B2 (en) Fluid circuit and industrial truck having a fluid circuit
KR20090048415A (en) Safety mechanism employable in abrasive suspension jet machine and abrasive suspension jet machine
CN114060355B (en) Hydraulic test system and test method
CN207315753U (en) A kind of open and close type switches hydraulic system
CN101708548B (en) Tundish nozzle quick-change hydraulic control system of continuous casting machine
CN206668670U (en) A kind of multi-purpose hydraulic system oil filtering device
CN212370744U (en) Device for processing a hydraulic vehicle brake system
JP5024213B2 (en) Filter cleaning device
CN101115908A (en) Compressor uninstalling valve
CN110925254B (en) Pneumatic hydraulic safety system
CN202431647U (en) Hydraulic pump station for tail ladle cars
CN211951029U (en) Closed internal circulation hydraulic system and fracturing truck
CN1085813C (en) Method and equipment for cleaning lubricating system of engine
DE102012021843A1 (en) Hydraulic system with at least one hydrostatic displacement unit
CN113731965B (en) Device for treating a hydraulic vehicle brake system
JP2017155931A (en) Hydraulic device and method for removing foreign object in hydraulic cylinder of hydraulic device
JP2003028108A (en) Hydraulic operating device
CN215171263U (en) Scissor-fork type aerial work platform and lifting hydraulic system thereof
CN219651164U (en) Hydraulic braking system and scissor type aerial work platform
CN216447206U (en) Hydraulic control system of metal chip forming machine
CN106931004B (en) Platform is cleared up for base level, Relay and Base Level hydraulic system
CN217002061U (en) Diesel engine oil duct cleaning system
CN113530907A (en) Oil source control valve group, pilot control system and hydraulic oil processing method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant