A small accumulator testing device and testing method

Abstract

The application provides a small accumulator testing device and testing method, which comprises an oil inlet interface PS, a total oil inlet ball valve S1.1, a pressure reducing valve V1.1, a manual testing ball valve V1.2, an automatic testing ball valve V1.3, a solenoid valve V1.4, a running-in ball valve V1.5, a servo valve SV, an accumulator oil inlet ball valve V1.6, an accumulator oil return ball valve V1.7, an oil return interface PR, a total oil return ball valve S1.2, a pressure gauge and a pressure sensor; the automatic testing and the manual testing of the accumulator can be realized, and the pressure volume testing, the durability testing and the pressure maintaining testing can be satisfied.

Description

Technical Field

[0001] This invention belongs to the field of actuator testing technology, specifically relating to a small accumulator testing device and testing method. Background Technology

[0002] Currently, the integration level of hydraulic actuators is gradually increasing. Some products are designed with small accumulators to stabilize the pressure and flow during the operation of the actuator. These are mostly spring-type or bladder-type accumulators, and their configurations are mostly non-standard, with a pressure storage capacity range of 0 to 3 MPa.

[0003] Its pressure-volume characteristics and durability characteristics have a significant impact on actuator products, but there is still a lack of testing for this type of integrated accumulator in China.

[0004] This type of test bench currently has six main problems:

[0005] 1. There is currently no dedicated testing platform for accumulators, and manual assembly testing is mostly used.

[0006] 2. The accumulator test does not have an automatic break-in function;

[0007] 3. The accumulator test does not have an automatic testing function;

[0008] 4. Manual testing of accumulators is unstable and inefficient;

[0009] 5. During the testing process, the distance between the pressure testing point and the inside of the product is too far, resulting in inaccurate pressure detection;

[0010] 6. It cannot simultaneously support automatic testing, manual testing, and automatic break-in functions. Summary of the Invention

[0011] This invention provides a small accumulator testing device and testing method, which can realize automatic and manual testing of accumulators and meet the requirements of pressure volume testing, durability testing, and pressure holding testing.

[0012] The first aspect of the present invention provides a small accumulator testing device, comprising: an oil inlet port PS, a main oil inlet ball valve S1.1, a pressure reducing valve V1.1, a manual test ball valve V1.2, an automatic test ball valve V1.3, a solenoid valve V1.4, a break-in ball valve V1.5, a servo valve SV, an accumulator oil inlet ball valve V1.6, an accumulator oil return ball valve V1.7, an oil return port PR, a main oil return ball valve S1.2, a pressure gauge, and a pressure sensor;

[0013] The oil inlet port PS is connected to the oil inlet of the pressure reducing valve V1.1 through the main oil inlet ball valve S1.1. The oil outlet of the pressure reducing valve V1.1 is connected to the manual test ball valve V1.2, the automatic test ball valve V1.3, and the break-in ball valve V1.5 respectively. The oil drain port is connected to the oil return port PR through the main return ball valve S1.2.

[0014] The manual test ball valve V1.2 is also connected to the accumulator under test via the accumulator inlet ball valve V1.6;

[0015] The automatic test ball valve V1.3 is also connected to the first input interface of the solenoid valve V1.4. The second input interface of the solenoid valve V1.4 is connected to the return interface PR through the main return ball valve S1.2. The output interface of the solenoid valve V1.4 is connected to the accumulator under test through the accumulator inlet ball valve V1.6.

[0016] The break-in ball valve V1.5 is also connected to the oil inlet of the servo valve SV. The oil return port of the servo valve SV is connected to the oil return interface PR through the main oil return ball valve S1.2. The first load interface of the servo valve SV is connected to the accumulator under test through the accumulator inlet ball valve V1.6, and the second load interface is closed.

[0017] The accumulator return ball valve V1.7 is located between the accumulator inlet ball valve V1.6 and the accumulator under test, and is used for oil discharge;

[0018] Pressure gauges are installed at both the inlet and outlet of the pressure reducing valve V1.1, and a pressure sensor is installed at the interface of the accumulator under test.

[0019] Optionally, the pressure gauge and pressure sensor are also equipped with needle valves and pressure test connectors for online calibration.

[0020] A second aspect of the present invention provides a testing method using the small accumulator testing device described in the first aspect, the method comprising:

[0021] S1. Close the accumulator return ball valve V1.7;

[0022] S2, Open the main return ball valve S1.2 and the main inlet ball valve S1.1;

[0023] S3. Based on the working pressure of the accumulator under test and the pressure gauge reading, adjust the pressure reducing valve V1.1 to reduce the pressure at the oil outlet of the pressure reducing valve V1.1 to the working pressure of the accumulator under test.

[0024] Optionally, after S3, the test method further includes:

[0025] S4. When manually testing the accumulator, open the manual test ball valve V1.2 and the accumulator oil inlet ball valve V1.6, close the automatic test ball valve V1.3 and the break-in ball valve V1.5, connect the first input interface and the output interface of the solenoid valve V1.4, and pressurize the accumulator.

[0026] S4. When the pressure sensor detects that the pressure has reached the working pressure, close the manual test ball valve V1.2 and open the accumulator return ball valve V1.7 to depressurize the accumulator.

[0027] S5. When there is abnormal movement of the accumulator piston or oil leakage in the accumulator, the accumulator is confirmed to be abnormal.

[0028] Optionally, after S3, the test method further includes:

[0029] S6. During the pressure test, open the manual test ball valve V1.2 and the accumulator oil inlet ball valve V1.6, close the automatic test ball valve V1.3 and the break-in ball valve V1.5, and connect the first input interface and the output interface of the solenoid valve V1.4.

[0030] S7. Adjust the pressure reducing valve V1.1 to set the output pressure of the pressure reducing valve V1.1 to the preset pressure resistance of the accumulator;

[0031] S8. If oil leakage or damage is observed in the accumulator within the preset time period, the accumulator is confirmed to be abnormal.

[0032] Optionally, after S3, the test method further includes:

[0033] S9. During the pressure-volume characteristic test, adjust the pressure at the outlet of the pressure reducing valve V1.1 to different working pressures;

[0034] S10. Under different working pressures, open the manual test ball valve V1.2 and the accumulator oil inlet ball valve V1.6, close the automatic test ball valve V1.3 and the break-in ball valve V1.5, and connect the first input interface and the output interface of the solenoid valve V1.4.

[0035] S10. After the accumulator pressure stabilizes, close the accumulator inlet ball valve V1.6 and open the accumulator return ball valve V1.7. At the same time, start the stopwatch. When all the oil in the accumulator is discharged, stop the stopwatch. Obtain the accumulator depressurization time and volume under different working pressures, and thus obtain the pressure-volume characteristics of the accumulator.

[0036] Optionally, after S3, the test method further includes:

[0037] S11. During automatic testing, open the automatic test ball valve V1.3 and the accumulator oil inlet ball valve V1.6, and close the manual test ball valve V1.2 and the break-in ball valve V1.5.

[0038] S12 controls the first and second input interfaces of the solenoid valve V1.4 to alternately connect with the output interface to automatically test the accumulator.

[0039] Optionally, after S3, the test method further includes:

[0040] S13. During the break-in cycle, close the manual test ball valve V1.2 and the automatic test ball valve V1.3, connect the first input interface and the output interface of the solenoid valve V1.4, and open the break-in ball valve V1.5 and the accumulator oil inlet ball valve V1.6.

[0041] S14. Control the servo valve SV to perform a break-in test on the accumulator.

[0042] Optionally, after S3, the test method further includes:

[0043] S15. During the durability test, close the manual test ball valve V1.2 and the automatic test ball valve V1.3, connect the first input interface and the output interface of the solenoid valve V1.4, and open the break-in ball valve V1.5 and the accumulator oil inlet ball valve V1.6.

[0044] S16. By adjusting the frequency of the servo valve SV, tests are conducted at different charge / discharge pressure frequencies. Simultaneously, by adjusting the working pressure, tests are performed under different loads. The number of charge / discharge cycles under different working pressures is recorded to complete the durability test of the accumulator.

[0045] This invention provides a small accumulator testing device and method, offering for the first time an integrated solution for testing non-standard accumulators used in actuators. It enables both automatic and manual testing of accumulators, meeting testing requirements such as pressure-volume testing, durability testing, and pressure holding testing. The device can perform accumulator testing in multiple modes, including manual testing, automatic testing, and break-in cycles. It features pressure regulation, manual testing, and pressure resistance testing functions. It also includes pressure display, pressure recording, and pressure-volume characteristic testing under different pressures. The automatic testing function automatically charges and discharges the accumulator by controlling the solenoid valve. The break-in cycle function performs a break-in test on the accumulator by controlling the servo valve, and the servo valve frequency can be adjusted to regulate the charging and discharging frequency. The durability testing function performs durability testing by adjusting different load requirements (changing inlet oil pressures P1, P2, etc.) and simultaneously charging and discharging at a certain frequency, recording the number of charging and discharging cycles. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the test principle of the small energy storage device of the present invention;

[0047] The components include: oil inlet port PS, main oil inlet ball valve S1.1, pressure reducing valve V1.1, manual test ball valve V1.2, automatic test ball valve V1.3, solenoid valve V1.4, break-in ball valve V1.5, servo valve SV, accumulator oil inlet ball valve V1.6, accumulator oil return ball valve V1.7, oil return port PR, main oil return ball valve S1.2, first pressure gauge P1.1, second pressure gauge P1.2, pressure sensor PT1.3, first needle valve K1.1, second needle valve K1.2, third needle valve K1.3, first pressure test connector JT1.1, second pressure test connector JT1.2, and third pressure test connector JT1.3. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0050] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0051] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0052] Reference Figure 1This invention provides a small accumulator testing device and testing method. The small accumulator testing device includes: an oil inlet port PS, a main oil inlet ball valve S1.1, a pressure reducing valve V1.1, a manual test ball valve V1.2, an automatic test ball valve V1.3, a solenoid valve V1.4, a break-in ball valve V1.5, a servo valve SV, an accumulator oil inlet ball valve V1.6, an accumulator oil return ball valve V1.7, an oil return port PR, a main oil return ball valve S1.2, a pressure gauge, and a pressure sensor.

[0053] The oil inlet port PS is connected to the oil inlet of the pressure reducing valve V1.1 through the main oil inlet ball valve S1.1. The oil outlet of the pressure reducing valve V1.1 is connected to the manual test ball valve V1.2, the automatic test ball valve V1.3, and the break-in ball valve V1.5 respectively. The oil drain port is connected to the oil return port PR through the main return ball valve S1.2.

[0054] The manual test ball valve V1.2 is also connected to the accumulator under test via the accumulator inlet ball valve V1.6;

[0055] The automatic test ball valve V1.3 is also connected to the first input interface of the solenoid valve V1.4. The second input interface of the solenoid valve V1.4 is connected to the return interface PR through the main return ball valve S1.2. The output interface of the solenoid valve V1.4 is connected to the accumulator under test through the accumulator inlet ball valve V1.6.

[0056] The break-in ball valve V1.5 is also connected to the oil inlet of the servo valve SV. The oil return port of the servo valve SV is connected to the oil return interface PR through the main oil return ball valve S1.2. The first load interface of the servo valve SV is connected to the accumulator under test through the accumulator inlet ball valve V1.6, and the second load interface is closed.

[0057] The accumulator return ball valve V1.7 is located between the accumulator inlet ball valve V1.6 and the accumulator under test, and is used for oil discharge;

[0058] Pressure gauges are installed at both the inlet and outlet of the pressure reducing valve V1.1, and a pressure sensor is installed at the interface of the accumulator under test.

[0059] like Figure 1 As shown, the testing device includes: an inlet and outlet oil pressure regulating module, a pressure display and recording module, a manual testing module, an automatic testing module, and a break-in testing module.

[0060] The testing device employs an inlet and outlet oil pressure regulating module. The device has an inlet port PS and an outlet port PR, with ball valves controlling the main inlet and outlet oil flow. This includes a main inlet ball valve S1.1 and a main outlet ball valve S1.2. A pressure reducing valve V1.1 is located at the rear end of the main inlet ball valve S1.1. The pressure reducing valve V1.1's pressure relief circuit is connected to the outlet oil circuit, and the pressure reducing circuit is connected to the main test oil circuit. The pressure reducing valve V1.1 is adjusted to the required test pressure according to the requirements of different accumulators.

[0061] The pressure display and recording module is designed with two pressure gauges and one pressure sensor. The first pressure gauge P1.1 displays the total inlet oil pressure, the second pressure gauge P1.2 displays the pressure after pressure reduction by the pressure reducing valve, and the pressure sensor PT1.3 records the pressure data during the accumulator test. The pressure sensor and pressure gauges are equipped with the necessary online calibration components: the first needle valve K1.1, the second needle valve K1.2, the third needle valve K1.3, the first pressure test connector JT1.1, the second pressure test connector JT1.2, and the third pressure test connector JT1.3. Most importantly, it records the pressure curve, which records the number of break-in cycles. The pressure curve also reflects the characteristics of the accumulator's pressure increase and decrease process, and records the pressure volume characteristics as a basis for judging the charging and depressurization.

[0062] The manual testing module uses an accumulator inlet ball valve V1.6 and an accumulator return ball valve V1.7. During manual testing, the accumulator inlet ball valve V1.6 is opened, and the manual test ball valve V1.2 is opened at the same time to pressurize the accumulator. The pressure sensor value is observed. After the pressure reaches the required value, the accumulator return ball valve V1.7 is opened to depressurize the accumulator.

[0063] During the pressure test, close the return oil ball valve V1.7, open the accumulator inlet oil ball valve V1.6 and the manual test ball valve V1.2, adjust the pressure reducing valve V1.1, and set the pressure to all the pressure resistance pressures (usually 21MPa). Observe the high-pressure sealing of the accumulator.

[0064] During the pressure-volume characteristic test, the manual test module was used. The accumulator return ball valve V1.7 was closed, and the accumulator inlet ball valve V1.6 and the manual test ball valve V1.2 were opened to pressurize the accumulator. The pressure sensor was observed to rise to high pressure and stabilize without further change. Fuel was then used to close the accumulator inlet ball valve V1.6 and open the accumulator return ball valve V1.7. At the same time, a stopwatch was started. The return oil was connected to the atmosphere through a measuring cup until all the oil was drained and the stopwatch stopped. The duration and volume of the accumulator depressurization were recorded, which is the pressure-volume characteristic. By adjusting different pressure values, this operation was repeated to record the pressure-volume characteristics under different pressures.

[0065] During automatic testing, the manual test ball valve V1.2 is closed, the automatic test ball valve V1.3 is opened, and the automatic testing of the accumulator is achieved by controlling the opening and closing of the two-position two-way solenoid valve V1.4. When the solenoid valve V1.4 is energized, the high-pressure oil circuit is connected to the accumulator to pressurize the accumulator. When the solenoid valve V1.4 is de-energized, the return oil is connected to the accumulator to depressurize the accumulator.

[0066] During the break-in cycle, the manual test ball valve V1.2 is closed, the automatic test ball valve V1.3 at the front end of the solenoid valve V1.4 is closed, and the break-in ball valve V1.5 is opened. At the same time, the accumulator is run-in tested by controlling the servo valve SV. The P port of the servo valve SV is connected to the oil inlet, the T port of the servo valve SV is connected to the oil return, the A port of the servo valve SV is connected to the accumulator, and the B port of the servo valve SV is closed. At this time, the break-in cycle of the accumulator is realized by controlling the current of the servo valve SV.

[0067] During durability testing, open the break-in ball valve V1.5. By adjusting the frequency of the servo valve SV, testing can be performed without testing the charging and discharging pressure frequency. At the same time, by adjusting the pressure, testing under different loads can be performed. By recording the number of charging and discharging pressures under different pressures, the durability test of the accumulator can be completed.

[0068] This testing platform operates on a dual-system basis. Its functions are as follows: the testing environment is designed with a pressure reducing valve to meet different pressure testing requirements of the test bench; manual valves are used for testing to enable manual charging, depressurization, and pressure holding tests of the accumulator; the inlet and outlet oil circuits are designed with two manual valves for volumetric characteristic testing; a solenoid valve is designed to meet the automatic testing requirements of the accumulator; and a servo valve is designed to meet the automatic break-in and durability testing requirements of the accumulator.

[0069] The above-described embodiments are merely preferred embodiments of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be included within the scope of protection of the present invention.

Claims

1. A small energy storage device for testing, characterized in that, include: Oil inlet port PS, main oil inlet ball valve S1.1, pressure reducing valve V1.1, manual test ball valve V1.2, automatic test ball valve V1.3, solenoid valve V1.4, break-in ball valve V1.5, servo valve SV, accumulator oil inlet ball valve V1.6, accumulator oil return ball valve V1.7, oil return port PR, main oil return ball valve S1.2, pressure gauge and pressure sensor; The oil inlet port PS is connected to the oil inlet of the pressure reducing valve V1.1 through the main oil inlet ball valve S1.

1. The oil outlet of the pressure reducing valve V1.1 is connected to the manual test ball valve V1.2, the automatic test ball valve V1.3, and the break-in ball valve V1.5 respectively. The oil drain port is connected to the oil return port PR through the main return ball valve S1.

2. The manual test ball valve V1.2 is also connected to the accumulator under test via the accumulator inlet ball valve V1.6; The automatic test ball valve V1.3 is also connected to the first input interface of the solenoid valve V1.

4. The second input interface of the solenoid valve V1.4 is connected to the return interface PR through the main return ball valve S1.

2. The output interface of the solenoid valve V1.4 is connected to the accumulator under test through the accumulator inlet ball valve V1.

6. The break-in ball valve V1.5 is also connected to the oil inlet of the servo valve SV. The oil return port of the servo valve SV is connected to the oil return interface PR through the main oil return ball valve S1.

2. The first load interface of the servo valve SV is connected to the accumulator under test through the accumulator inlet ball valve V1.6, and the second load interface is closed. The accumulator return ball valve V1.7 is located between the accumulator inlet ball valve V1.6 and the accumulator under test, and is used for oil discharge; Pressure gauges are installed at both the inlet and outlet of the pressure reducing valve V1.1, and a pressure sensor is installed at the interface of the accumulator under test.

2. The small energy storage device according to claim 1, characterized in that, The pressure gauge and pressure sensor are also equipped with needle valves and pressure testing connectors for online calibration.

3. A testing method using the small energy storage device as described in claims 1 or 2, characterized in that, The method includes: S1. Close the accumulator return ball valve V1.7; S2, Open the main return ball valve S1.2 and the main inlet ball valve S1.1; S3. Based on the working pressure and pressure gauge reading of the accumulator under test, adjust the pressure reducing valve V1.1 to reduce the pressure at the outlet of the pressure reducing valve V1.1 to the preset working pressure of the accumulator under test.

4. The test method according to claim 3, characterized in that, Following S3, it also includes: S4. When manually testing the accumulator, open the manual test ball valve V1.2 and the accumulator oil inlet ball valve V1.6, close the automatic test ball valve V1.3 and the break-in ball valve V1.5, connect the first input interface and the output interface of the solenoid valve V1.4, and pressurize the accumulator. S4. When the pressure sensor detects that the pressure has reached the preset working pressure, close the manual test ball valve V1.2 and open the accumulator return ball valve V1.7 to depressurize the accumulator. S5. When there is abnormal movement of the accumulator piston or oil leakage in the accumulator, the accumulator is confirmed to be abnormal.

5. The test method according to claim 3, characterized in that, Following S3, the method further includes: S6. During the pressure test, open the manual test ball valve V1.2 and the accumulator oil inlet ball valve V1.6, close the automatic test ball valve V1.3 and the break-in ball valve V1.5, and connect the first input interface and the output interface of the solenoid valve V1.

4. S7. Adjust the pressure reducing valve V1.1 to set the output pressure of the pressure reducing valve V1.1 to the preset pressure resistance of the accumulator; S8. If oil leakage or damage is observed in the accumulator within the preset time period, the accumulator is confirmed to be abnormal.

6. The test method according to claim 3, characterized in that, Following S3, the method further includes: S9. During the pressure-volume characteristic test, adjust the pressure at the outlet of the pressure reducing valve V1.1 to different working pressures; S10. Under different working pressures, open the manual test ball valve V1.2 and the accumulator oil inlet ball valve V1.6, close the automatic test ball valve V1.3 and the break-in ball valve V1.5, and connect the first input interface and the output interface of the solenoid valve V1.

4. S10. After the accumulator pressure stabilizes, close the accumulator inlet ball valve V1.6 and open the accumulator return ball valve V1.

7. At the same time, start the stopwatch. When all the oil in the accumulator is discharged, stop the stopwatch. Obtain the accumulator depressurization time and volume under different working pressures, and thus obtain the pressure-volume characteristics of the accumulator.

7. The test method according to claim 3, characterized in that, Following S3, the method further includes: S11. During automatic testing, open the automatic test ball valve V1.3 and the accumulator oil inlet ball valve V1.6, and close the manual test ball valve V1.2 and the break-in ball valve V1.

5. S12 controls the first and second input interfaces of the solenoid valve V1.4 to alternately connect with the output interface to automatically test the accumulator.

8. The test method according to claim 3, characterized in that, Following S3, the method further includes: S13. During the break-in cycle, close the manual test ball valve V1.2 and the automatic test ball valve V1.3, connect the first input interface and the output interface of the solenoid valve V1.4, and open the break-in ball valve V1.5 and the accumulator oil inlet ball valve V1.

6. S14. Control the servo valve SV to perform a break-in test on the accumulator.

9. The test method according to claim 3, characterized in that, Following S3, the method further includes: S15. During the durability test, close the manual test ball valve V1.2 and the automatic test ball valve V1.3, connect the first input interface and the output interface of the solenoid valve V1.4, and open the break-in ball valve V1.5 and the accumulator oil inlet ball valve V1.

6. S16. By adjusting the frequency of the servo valve SV, tests are conducted at different charge and discharge pressure frequencies. At the same time, by adjusting the working pressure, tests are conducted under different loads. The number of charge and discharge pressures under different working pressures is recorded to complete the durability test of the accumulator.

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