A method and system for automatic pressure-maintaining test of hydraulic support seals

Abstract

The present invention discloses an automatic pressure-maintaining test method and system for hydraulic support seals, including a first hydraulic system for reversing and filling the extension and retraction of the tested jack, and a second hydraulic system for completing the automatic pressure-maintaining test of a rodless cavity or a rod cavity. When the large-flow system of the present invention completes the pressure-maintaining test, it can control the rapid reversal and filling of the jack; the small-flow system completes the pressure-maintaining test required by the test standard. The design of the dual hydraulic system pressure-maintaining test circuit, coupled with PLC control and computer interface, realizes the automation of the pressure-maintaining test, improves the tediousness of the test that usually relies on manual operation, shortens the pressure-maintaining test time, and the small-flow boost pressure-maintaining system provides extremely high test safety. The pressure-maintaining system can not only complete low-pressure and high-pressure pressure-maintaining tests at one time, but also complete step-shaped pressure-maintaining tests under different pressures at one time according to the test requirements. The control system can automatically generate test reports and test curves, with a very high degree of digitization and automation.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic support testing, and in particular to an automatic pressure-maintaining test method and system for a hydraulic support seal or similar scenarios. Background Art

[0002] Hydraulic supports are a type of supports that use the hydraulic pressure generated by hydraulic cylinders to drive the supports to achieve lifting and supporting the coal wall. Hydraulic supports include oil-based hydraulic supports and pure water-based hydraulic supports. With the development of science and technology and the popularization of environmental protection concepts, pure water-based hydraulic supports are increasingly widely used. When developing the seals of pure water-based hydraulic supports, it is necessary to conduct high and low pressure holding tests on the seals.

[0003] At present, the method of conducting high and low pressure maintenance test is mostly to open the pump source through a manual high-pressure stop valve, use a manual or electromagnetic reversing valve to switch to a chamber that needs to be maintained, and observe the pressure gauge. When the pressure rises, manually adjust the pressure regulating valve to the pressure of the pressure maintenance. When the pressure indication reaches the pressure of the pressure maintenance, manually operate the stop valve to cut off the liquid inlet and close the pump station. However, the above method has the following disadvantages. When conducting high and low pressure maintenance tests, it needs to be completed in two times. Specifically, after the low-pressure test is completed, manual pressure relief is required, and then a high-pressure maintenance test is performed. After the high-pressure maintenance test is completed, the test is performed again manually. When testing multiple seals, the operation is cumbersome and requires manual attention at all times, and test data and related reports cannot be generated. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art and to propose an automatic pressure-maintaining test method and system for a hydraulic support seal.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a method for automatically maintaining pressure of a hydraulic support seal, the specific steps of which include:

[0006] The first hydraulic system for controlling the reversing controls the extension and retraction of the tested jack, and the second hydraulic system completes the automatic pressure-maintaining test of the rodless cavity or the rod cavity respectively. The control system records the data of the high and low pressure pressure-maintaining test and outputs the test report.

[0007] As a further description of the above technical solution, when conducting high and low pressure maintaining tests on the rodless chamber, the third solenoid reversing valve and the fourth solenoid valve in the second hydraulic system are closed at the same time, and the third solenoid reversing valve is connected to the rod chamber, and the fourth solenoid valve is connected to the rodless chamber, the first solenoid reversing valve and the second solenoid reversing valve are closed, the fourth solenoid reversing valve is used to feed liquid into the rodless chamber, and the third solenoid reversing valve is used to return liquid.

[0008] As a further description of the above technical solution, the control system controls the pressure sensor and high-pressure pump combination in the second hydraulic system to set the holding pressure and time in digital form through a dedicated window on the computer interface during the low-pressure holding test, input the required low-pressure holding pressure and time, and maintain the first holding time;

[0009] During the high pressure holding test, a holding pressure and time of 1.25 times the rated working pressure of the tested jack are input, and the second holding pressure time is maintained.

[0010] As a further description of the above technical solution, when performing a high-pressure holding test, the first electromagnetic regulating valve controls the holding pressure with a gradient and maintains a predetermined holding time within each pressure gradient.

[0011] As a further description of the above technical solution, when conducting a rod chamber pressure maintaining test, the first solenoid reversing valve and the second solenoid reversing valve in the second hydraulic system are connected to the rod chamber, the third solenoid reversing valve and the fourth solenoid reversing valve are closed, the first solenoid reversing valve is used to feed liquid into the rod chamber, and the second solenoid reversing valve is used to return liquid.

[0012] As a further description of the above technical solution, when the first hydraulic system controls the test cylinder to switch to the rod chamber, the fifth electromagnetic reversing valve in the first hydraulic system is used to supply liquid to the test cylinder, and the sixth electromagnetic reversing valve is used to return liquid;

[0013] When switching to the rodless chamber, the eighth electromagnetic reversing valve in the second hydraulic system is used to supply fluid to the test cylinder, and the seventh electromagnetic reversing valve is used to return fluid.

[0014] A hydraulic system using an automatic pressure-maintaining test method for a hydraulic support seal comprises a first hydraulic system and a second hydraulic system;

[0015] The first hydraulic system and the second hydraulic system are both connected to the liquid inlet and liquid return port of the test cylinder;

[0016] The first hydraulic system is used to control the reversing of the piston rod in the test cylinder, and the second hydraulic system is used to perform a pressure-maintaining test on the test cylinder.

[0017] As a further description of the above technical solution, the second hydraulic system includes:

[0018] A first electromagnetic reversing valve group, the first electromagnetic reversing valve group comprising a first electromagnetic reversing valve and a second electromagnetic reversing valve, the first electromagnetic reversing valve group being used for performing a pressure-maintaining test on the rod chamber;

[0019] A second electromagnetic reversing valve group, the second electromagnetic reversing valve group comprising a third electromagnetic reversing valve and a fourth electromagnetic reversing valve, the second electromagnetic reversing valve group being used for performing a pressure-maintaining test on the rodless chamber;

[0020] A first liquid inlet circuit, wherein the liquid inlet circuit comprises a first pure water pump station, a first pressure gauge and a first pressure sensor;

[0021] The first liquid return circuit includes a first oil return filter and a first air filter.

[0022] As a further description of the above technical solution, the first hydraulic system includes:

[0023] The electromagnetic reversing valve group three includes a fifth electromagnetic reversing valve and a sixth electromagnetic reversing valve;

[0024] The electromagnetic reversing valve group 4 includes a seventh electromagnetic reversing valve and an eighth electromagnetic reversing valve;

[0025] A second liquid inlet circuit, the second liquid inlet circuit comprising a second water pump, a second pressure gauge, a second pressure sensor and a water tank;

[0026] The second liquid return circuit includes a second oil return filter and a second air filter.

[0027] As a further description of the above technical solution, a first electromagnetic pressure regulating valve is provided between the first liquid inlet circuit and the first liquid return circuit;

[0028] A second electromagnetic pressure regulating valve is arranged between the second liquid inlet circuit and the second liquid return circuit.

[0029] The present invention has the following beneficial effects:

[0030] 1. The present invention can perform high and low pressure holding tests on both the rodless cavity and the rod cavity of the tested jack, and adopts dual systems, namely a large pump system and a small pump system. The large pump system is used for reversing and filling, and the small pump system performs pressure holding tests. The two sets of hydraulic systems have clear division of labor and do not interfere with each other, which can save energy and be safer and more reliable. At the same time, after the pressure holding test is completed, the external control system can automatically generate test reports and test curves, with a higher degree of digitization and automation.

[0031] 2. When the preset pressure parameter value is reached, the control system of the present invention can automatically stop or start the high-pressure pure water system, i.e., the first pure water pump station, and at the same time control the automatic jump to the next pressure maintenance process when a certain pressure maintenance time is reached, until the entire pressure maintenance process is automatically stopped after the end. Compared with the existing manual pressure maintenance test, it is faster and the control is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A hydraulic schematic diagram showing the connection between the first hydraulic system, the second hydraulic system and the test cylinder;

[0033] Figure 2 This is the hydraulic diagram of high and low pressure holding test;

[0034] Figure 3 This is a loading trend diagram during the multi-gradient pressure holding test.

[0035] Legend:

[0036] 1. First hydraulic system; 101. Fifth solenoid reversing valve; 102. Sixth solenoid reversing valve; 103. Seventh solenoid reversing valve; 104. Eighth solenoid reversing valve; 105. Second liquid inlet circuit; 106. Second water pump; 107. Second pressure gauge; 108. Second pressure sensor; 109. Water tank; 110. Second liquid return circuit; 111. Second oil return filter; 112. Second air filter; 113. Second solenoid pressure regulating valve; 2. Second hydraulic system; 20 1. The first solenoid reversing valve; 202. The second solenoid reversing valve; 203. The third solenoid reversing valve; 204. The fourth solenoid reversing valve; 205. The first liquid inlet circuit; 206. The first pure water pump station; 207. The first pressure gauge; 208. The first pressure sensor; 209. The first liquid return circuit; 210. The first return oil filter; 211. The first air filter; 212. The first solenoid pressure regulating valve; 3. The test cylinder; 31. The piston rod; 32. The rodless chamber; 33. The rod chamber. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The present invention provides an embodiment of an automatic pressure-maintaining test method for a hydraulic support seal. The method is mainly used for the research and development test of the seal of a hydraulic support of a pure water medium to provide data support for the research and development of the seal to ensure the reliability of the sealing performance of the seal. The specific steps include:

[0039] The rod chamber 33 and the rodless chamber 32 are tested for high and low pressure respectively: the first hydraulic system 1, i.e., the large pump system, controls the liquid inlet and return of the test cylinder 3, so that the piston rod 31 in the test cylinder 3 is fully extended, so that only the rodless chamber 32 exists in the test cylinder 3, and then the large pump system stops working; the second hydraulic system 2 participates in the work, i.e., the small pump system, and the low pressure parameters are set by the external control system to control the small pump system to perform a low pressure pressure test on the rodless chamber 32. After the low pressure pressure test is completed, the control system controls the small pump system to perform a high pressure pressure test on the rodless chamber 32. During the high pressure pressure test, the small pump system controls the pressure holding pressure with a gradient, and maintains a predetermined pressure holding time within each pressure gradient, so that the high pressure pressure test is more comprehensive, and the sealing condition of the seal under various pressure conditions can be measured. During the high and low pressure pressure test on the rodless chamber 32, the host computer in the control system can record the parameters such as time and pressure value during the test, and can automatically generate a test report after the test is completed.

[0040] When testing the rod chamber 33, the first hydraulic system 1 performs liquid inlet and return operations on the test cylinder 3 to reset the piston in the test cylinder 3 so that only the rod chamber 33 exists in the test cylinder 3. After the reset is completed, the first hydraulic system 1 stops working; the second hydraulic system 2 participates in the work, and the low-pressure parameters, that is, the pressure value, can be selected from 2-5 MPa, and the first preset time are set through the external control system. The time parameter can be set according to actual needs and test standards. When the low-pressure holding time is performed, the control system also monitors the parameters of the low-pressure test, and a test report will be automatically generated at the end of the test. After the low-pressure test is completed, the second hydraulic system 2 performs a high-pressure test on the rod chamber 33 of the test cylinder 3. The test pressure of the high-pressure test can be 1.25 times the working pressure of the test cylinder 3, such as 35 MPa, which can be adjusted according to actual test needs. The control system can automatically generate a test report after the high-pressure test is completed.

[0041] This high and low pressure test method can perform high and low pressure holding tests on the test cylinder 3, i.e., the rodless chamber 32 and the rod chamber 33 of the tested jack, and simultaneously adopts a dual system, i.e., the first hydraulic system 1 and the second hydraulic system 2, wherein the first hydraulic system 1 is a large flow system, and the second hydraulic system is a small flow boost system. When the large flow system completes the pressure holding test, the jack is quickly reversed and filled with fluid, and the small flow system completes the pressure holding test required by the test standard. The design of the dual hydraulic system pressure holding test circuit, coupled with PLC control and computer interface, realizes the automation of the pressure holding test, thereby greatly improving the tediousness of the test that usually relies on manual operation, greatly shortening the pressure holding test time, and greatly reducing the power consumption during the test. The small flow boost pressure holding system provides extremely high test safety. At the same time, the pressure holding system can not only complete low-pressure and high-pressure pressure holding tests at one time, but also complete step pressure holding tests under different pressures at one time according to the test requirements. In particular, the pressure holding time under each segmented step pressure can be set individually. In particular, after the test, the control system can automatically generate test reports and test curves, with a very high degree of digitization and automation.

[0042] refer to Figure 1 - Figure 2 , the present application provides a system for high and low pressure holding tests using the above method;

[0043] See also Figure 1 , the whole system includes a first hydraulic system 1, a second hydraulic system 2 and a test cylinder 3;

[0044] The first hydraulic system 1 includes two groups of electromagnetic reversing valves, specifically electromagnetic reversing valve group three and electromagnetic reversing valve group four, wherein the electromagnetic reversing valve group three is used to switch the test cylinder 3 to a state without a rod chamber 32, the fifth electromagnetic reversing valve 101 of the electromagnetic reversing valve group three is connected to the liquid inlet of the test cylinder 3, and the sixth electromagnetic reversing valve 102 is connected to the liquid outlet of the test cylinder 3; and the electromagnetic reversing valve group four is used to switch the test cylinder 3 to a state with a rod chamber 33;

[0045] The first hydraulic system 1 also includes a second liquid inlet circuit 105 and a second liquid return circuit 110, wherein the second liquid inlet circuit 105 includes a second water pump 106 for supplying liquid, a second pressure gauge 107 and a second pressure sensor 108 for detecting pressure; the second liquid return circuit 110 is provided with a second oil return filter 111 and a second air filter 112. A second electromagnetic pressure regulating valve 113 is connected between the second liquid inlet circuit 105 and the second liquid return circuit 110, and the pressure regulating valve is specifically an electric proportional pressure regulating valve, which can be adjusted to the pressure required by the electromagnetic reversing valve group 3 and the electromagnetic reversing valve group 4 when adjusting the test cylinder 3, so as to switch between the rod chamber 33 and the rodless chamber 32.

[0046] refer to Figure 1 and Figure 2 , the function of the second hydraulic system 2 is to perform high and low pressure pressure holding tests. The second hydraulic system 2 also includes two groups of electromagnetic reversing valves, specifically electromagnetic reversing valve group 1 and electromagnetic reversing valve group 2, wherein the electromagnetic reversing valve group 1 includes the first electromagnetic reversing valve 201 and the second electromagnetic reversing valve 202, and the electromagnetic reversing valve group 2 includes the third electromagnetic reversing valve 203 and the fourth electromagnetic reversing valve 204. When performing the pressure holding test of the rod chamber 33, the first electromagnetic reversing valve 201 is connected to the liquid inlet of the test cylinder 3, and the second electromagnetic reversing valve 202 is connected to the liquid return port of the test cylinder 3. At this time, the third electromagnetic reversing valve 203 and the fourth electromagnetic reversing valve 204 are in a closed state; when performing the high and low pressure test of the rodless chamber 32, the first electromagnetic reversing valve 201 and the second electromagnetic reversing valve 202 are in a closed state, the fourth electromagnetic reversing valve 204 is used for liquid inlet, and the third electromagnetic reversing valve 203 is used for liquid return. Both solenoid valve group 1 and solenoid valve group 2 are solenoid ball valve pressure-maintaining reversing valves, which can greatly improve the accuracy of the test, the number of tests, and shorten the test time. At the same time, compared with the existing manual valve control, it is more accurate and convenient.

[0047] It also includes a first liquid inlet circuit 205, which includes a first pure water pump station 206, a first pressure gauge 207, a first pressure sensor 208, and a time transmitter. When the preset pressure parameter value is reached, the control system can automatically stop or start the high-pressure water pump system, i.e., the first pure water pump station 206, and is also used to control the automatic jump to the next pressure holding process when a certain pressure holding time is reached, until the entire pressure holding process ends and stops automatically. For example, the pressure holding time is 1min at the 10mpa stage, and after the pressure holding ends, it is automatically adjusted to a pressure parameter of 15mpa, and the pressure is held for 1min, and so on. Compared with the existing manual pressure holding test, it is faster.

[0048] The first liquid return circuit 209 also includes a first oil return filter 210 and a first air filter 211 .

[0049] It also includes a control system, which is composed of an industrial computer, an industrial computer and a program to complete the automatic control of high and low pressure holding tests, as well as the generation of test curves and test reports after the test, with a higher degree of automation.

[0050] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic support seal automatic pressure test method, characterized in that: The specific steps include: The first hydraulic system for controlling the reversing controls the extension and retraction of the tested jack, and the second hydraulic system completes the automatic pressure-maintaining test of the rodless chamber or the rod chamber respectively, and the control system records the data of the high and low pressure pressure-maintaining test and outputs the test report; The second hydraulic system includes a third electromagnetic reversing valve and a fourth electromagnetic reversing valve. When performing a high and low pressure holding test of the rodless chamber, the third electromagnetic reversing valve and the fourth electromagnetic reversing valve in the second hydraulic system are closed at the same time, and the third electromagnetic reversing valve is connected to the rod chamber, and the fourth electromagnetic reversing valve is connected to the rodless chamber, the first electromagnetic reversing valve and the second electromagnetic reversing valve are closed, the fourth electromagnetic reversing valve is used to feed liquid into the rodless chamber, and the third electromagnetic reversing valve is used to return liquid; When the rod chamber pressure holding test is performed, the first electromagnetic reversing valve and the second electromagnetic reversing valve in the second hydraulic system are connected to the rod chamber, the third electromagnetic reversing valve and the fourth electromagnetic reversing valve are closed, the first electromagnetic reversing valve is used to feed liquid into the rod chamber, and the second electromagnetic reversing valve is used to return liquid; When the first hydraulic system controls the test cylinder to switch to the rod chamber, the fifth electromagnetic reversing valve in the first hydraulic system is used to supply liquid to the test cylinder, and the sixth electromagnetic reversing valve is used to return liquid; When switching to the rodless chamber, the eighth electromagnetic reversing valve in the second hydraulic system is used to supply fluid to the test cylinder, and the seventh electromagnetic reversing valve is used to return fluid.

2. The automatic pressure-maintaining test method for hydraulic support seals according to claim 1 is characterized in that: The control system controls the pressure sensor and high-pressure pump combination in the second hydraulic system to set the holding pressure and time in digital form through a dedicated window on the computer interface during the low-pressure holding test, inputs the required low-pressure holding pressure and time, and maintains the first holding time; When performing the high-pressure holding test, a holding pressure and time of 1.25 times the rated working pressure of the tested jack are input, and the second holding pressure time is maintained.

3. The automatic pressure-maintaining test method for hydraulic support seals according to claim 1 is characterized in that: When performing the high-pressure holding test, the first electromagnetic regulating valve controls the holding pressure with a gradient and maintains a predetermined holding time within each pressure gradient.

4. A hydraulic system using an automatic pressure-maintaining test method for hydraulic support seals, characterized in that: comprising a first hydraulic system and a second hydraulic system; The first hydraulic system and the second hydraulic system are both connected to the liquid inlet and the liquid return port of the test cylinder; The first hydraulic system is used to control the reversing of the piston rod in the test cylinder, and the second hydraulic system is used to perform a pressure holding test on the test cylinder; The second hydraulic system comprises: A first electromagnetic reversing valve group, the first electromagnetic reversing valve group comprising a first electromagnetic reversing valve and a second electromagnetic reversing valve, the first electromagnetic reversing valve group being used to perform a pressure-maintaining test on the rod chamber; A second electromagnetic reversing valve group, the second electromagnetic reversing valve group comprising a third electromagnetic reversing valve and a fourth electromagnetic reversing valve, the second electromagnetic reversing valve group being used for performing a pressure-maintaining test on the rodless chamber; A first liquid inlet circuit, wherein the liquid inlet circuit comprises a first pure water pump station, a first pressure gauge and a first pressure sensor; A first liquid return circuit, the first liquid return circuit comprising a first oil return filter and a first air filter; The first hydraulic system comprises: The electromagnetic reversing valve group three includes a fifth electromagnetic reversing valve and a sixth electromagnetic reversing valve; The electromagnetic reversing valve group 4 includes a seventh electromagnetic reversing valve and an eighth electromagnetic reversing valve; A second liquid inlet circuit, the second liquid inlet circuit comprising a second water pump, a second pressure gauge, a second pressure sensor and a water tank; The second liquid return circuit includes a second oil return filter and a second air filter.

5. The hydraulic system using the automatic pressure-maintaining test method for hydraulic support seals according to claim 4 is characterized in that: A first electromagnetic pressure regulating valve is provided between the first liquid inlet circuit and the first liquid return circuit; A second electromagnetic pressure regulating valve is arranged between the second liquid inlet circuit and the second liquid return circuit.

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