Reliability testing device and method for mechanical lock of oil receiving probe

Abstract

The present invention relates to the field of oil receiving probes, and specifically to a reliability testing device for a mechanical lock of an oil receiving probe and a testing method thereof, comprising a special frame vehicle with adjustable angle, and also comprising: a comprehensive test bench for a fuel receiving probe, a hydraulic electromagnetic switch, a two-way flow limiting valve, a pulsating pressure sensor, a three-way joint, and an external power supply. The specific steps are as follows: S1, test piece preparation; S2, test piece installation; S3, initial unlocking force measurement; S4, determining whether the two-way flow limiting valve meets the minimum flow rate for retraction and extension time; S5, verifying the working reliability of the mechanical lock under large flow rate; S6, adjusting the mechanical lock of the fuel receiving probe; S7, verifying the reliability and matching of the mechanical lock; S8, complete matching record; the present invention builds a test platform for the reliability of the mechanical lock of the oil receiving probe, which solves the problem that the current test method can only record the unlocking force of the probe retracted position lock but cannot detect the reliability of the mechanical lock and monitor the return oil pulsation, and can ensure it through test adjustment.

Description

Technical Field

[0001] The invention relates to the field of oil receiving probes, in particular to an oil receiving probe mechanical lock reliability testing device and a testing method thereof. Background Art

[0002] The hydraulic retraction and extension system of the aircraft's aerial fuel receiving pipe consists of an electric hydraulic switch, a dual-purpose valve, a throttle and a hydraulic actuator.

[0003] The lower portion of the hydraulic actuator is equipped with a retracted position lock for the aerial oil probe. This lock consists of a movable piston, a rectangular spring, and a steel ball clamp secured to the inner surface of the actuator. When the aerial oil probe is retracted, the electro-hydraulic switch is de-energized, connecting the hydraulic actuator's retraction and release chambers to the system's return oil. The high pressure in the retraction chamber is then fed back into the release chamber, causing a momentary pressure increase in the release chamber. When the pressure rise is sustained long enough to meet the retracted position ball lock release condition, the aerial oil probe's retracted position ball lock is released. The existing test platform uses a hose connection test, which has no requirements for the flow rate of the pipeline. It can only record the unlocking force of the retracted position lock of the oil receiving probe, but cannot verify whether the locking is reliable. At the same time, it is also impossible to monitor and record the pressure pulsation caused by the return pressure relief process. Therefore, it is necessary to design a method and corresponding device that can detect the reliability of the mechanical lock of the probe, accurately adjust the probe test pulsation environment (working fluid flow, flow resistance characteristics during the test, test pressure, etc.), monitor the hydraulic pulsation in real time, detect the reliability of the retracted position lock of the aerial oil receiving pipe, and reduce the probability of automatic unlocking failure. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a reliability testing device and a testing method for a mechanical lock of an oil receiving probe.

[0005] A device for testing the reliability of a mechanical lock of an oil receiving probe comprises a special angle-adjustable frame capable of adjusting the assembly angle of the oil receiving probe, and further comprises:

[0006] The fuel receiving probe comprehensive test bench has a built-in hydraulic power source. The retraction and extension time of the fuel receiving probe can be adjusted by setting parameters, and the frequency conversion hydraulic power source can be used to control the flow rate of the working fluid.

[0007] The hydraulic electromagnetic switch is connected to the fuel receiving probe integrated test bench and is used for hydraulic control and reversing;

[0008] The two-way flow limiting valve is connected to the hydraulic electromagnetic switch through the conduit 5 to achieve dual adjustment of flow rate and flow resistance;

[0009] A pulsation pressure sensor is connected to the two-way flow limiting valve via conduit six and to the oil receiving probe extension chamber via conduit seven, and is used to detect pulsation fluctuations;

[0010] The three-way connector is connected to the unlocking chamber, the retraction chamber and the hydraulic electromagnetic switch of the oil receiving probe through the conduit 10, the conduit 9 and the conduit 8 respectively;

[0011] The external power supply is connected to the hydraulic electromagnetic switch to provide a dedicated direct voltage.

[0012] As a further improvement of the present invention, the fuel receiving probe comprehensive test bench can control the retraction and extension time of the fuel receiving probe to be within 5±1s.

[0013] As a further improvement of the present invention, the hydraulic electromagnetic switch is a three-position four-way dedicated electromagnetic switch.

[0014] As a further improvement of the present invention, the two-way flow limiting valve controls the flow rate of the working fluid in the range of 3 to 10 L / min during the test.

[0015] As a further improvement of the present invention, the external power supply provides a dedicated DC voltage of 27±0.5V for the hydraulic electromagnetic switch.

[0016] As a further improvement of the present invention, the pulsating pressure sensor is placed at a distance of 550 mm from the oil receiving probe 11 extending out of the cavity.

[0017] As a further improvement of the present invention, the catheter five, catheter six, catheter ten, catheter nine, catheter eight, and catheter seven are all made of 1Cr18Ni10Ti material and have a diameter of φ6 mm.

[0018] As a further improvement of the present invention, the tilt angle of the angle-adjustable special frame vehicle is controlled between 55° and 60°.

[0019] As a further improvement of the present invention, the specification of the bidirectional flow limiting valve is 8L / min-10L / min.

[0020] As another improvement of the present invention, a method for testing the reliability of an oil probe mechanical lock is provided, wherein the specific steps are as follows:

[0021] S1. Test piece preparation:

[0022] Prepare the fuel receiving probe integrated test bench, hydraulic electromagnetic switch two-way current limiting valve, pulsating pressure sensor, conduit 5, conduit 6, conduit 7, conduit 8, conduit 9, conduit 10, fuel receiving probe, angle-adjustable special frame, tee joint, and external power supply.

[0023] S2. Test piece installation:

[0024] a. Install the fuel receiving probe to be adjusted onto the angle-adjustable special frame. Ensure that the installation angle of the fuel receiving probe is consistent with the frame. At the same time, use bolts to fix the fuel receiving probe to the angle-adjustable special frame.

[0025] b. Connect the dedicated sets of conduits and connect the extension chamber of the oil receiving probe through conduit seven; connect a pulsating pressure sensor to the extension hydraulic pipeline of the oil receiving probe to detect the hydraulic pressure pulsation value during the switching process of the hydraulic solenoid switch; also connect the two-way current limiting valve and the hydraulic solenoid switch;

[0026] c. The retraction chamber and unlocking chamber of the fuel receiving probe are connected through a three-way joint and then connected to the other working chamber of the hydraulic electromagnetic switch through a dedicated conduit 8. The hydraulic electromagnetic switch is connected to the hydraulic pressure power source of the fuel receiving probe comprehensive test bench;

[0027] S3. Initial unlocking force measurement:

[0028] a. After the connection is completed, the hydraulic power source of the fuel receiving probe comprehensive test bench supplies 10MPa hydraulic pressure, and the hydraulic electromagnetic switch is used to retract and extend the fuel receiving probe. Check whether the fuel receiving probe moves smoothly, and retract the fuel receiving probe into place;

[0029] b. Reduce the hydraulic power source pressure of the fuel receiving probe to less than 1 MPa, open the hydraulic solenoid switch to supply pressure to the extension chamber of the fuel receiving probe, and slowly increase the pressure of the hydraulic power source. Measure the hydraulic pressure when the fuel receiving probe begins to extend and record it as the initial unlocking pressure of the fuel receiving probe. Ensure that the initial unlocking force of the fuel receiving probe is not less than 1.4 MPa.

[0030] S4. Determine whether the bidirectional flow limiting valve meets the minimum flow rate during the retraction and extension time:

[0031] a. Increase the hydraulic power source pressure of the fuel receiving probe integrated test bench to 28MPa, and the test bench oil flow rate shall be no less than 15L / min;

[0032] b. Select flow limiting valves with different flow rates and measure the minimum flow limiting valve that meets the retraction and extension time of the fuel receiving probe. Use the minimum flow limiting valve that meets the retraction and extension time of the fuel receiving probe of 5±1s and record the flow rate of the flow limiting valve;

[0033] S5. Verify the reliability of the mechanical lock under high flow;

[0034] a. Increase the hydraulic power source pressure of the fuel receiving probe integrated test bench to 28MPa, with a fuel flow rate of no less than 15L / min, and select a two-way flow limiting valve with a flow rate of 10L / min;

[0035] b. After the receiving probe is retracted, the mechanical lock is activated. When the hydraulic solenoid switch switches from supplying pressure to the retraction chamber of the fuel receiving probe to the neutral position, check whether the fuel receiving probe is unlocked and extended. Record the peak value of the hydraulic pulsation when the hydraulic solenoid switch switches from supplying pressure to the retraction chamber to the neutral position.

[0036] S6. Adjustment of the mechanical lock of the fuel receiving probe:

[0037] a. If extension occurs during the test in step S5, increase the unlocking force by adding an adjustment washer to the rectangular spring inside the hydraulic actuator of the fuel receiving probe to ensure that the hydraulic pulse value during the switching of the hydraulic solenoid switch does not cause the fuel receiving probe to extend due to the impact;

[0038] b. If adding an adjustment shim does not resolve the rebound extension, replace the worn piston and steel ball clamp in the fuel receiving probe to adjust the situation. Unworn pistons and steel ball clamps have a relatively large travel when unlocking, and their mating areas with the steel ball are less worn, resulting in greater friction and a relatively high but stable unlocking force. Record the peak value of the hydraulic pulsation when the hydraulic solenoid switch is shifted from supplying pressure to the retraction chamber to the neutral position.

[0039] S7. Verification of mechanical lock reliability and compatibility:

[0040] a. Using the flow limiting valve determined in step S4, increase the supply pressure of the hydraulic power source of the fuel receiving probe integrated test bench 1 to 28 MPa, with a supply flow rate of no less than 15 L / min;

[0041] b. Measure the retraction and extension time of the fuel receiving probe to see if it complies with 5±1s. At the same time, after the probe is retracted into position, the mechanical lock is switched from the hydraulic solenoid switch supplying pressure to the retraction chamber of the fuel receiving probe to the neutral position, and check whether the fuel receiving probe is unlocked and extended.

[0042] c. Record the hydraulic pulsation peak pressure when the hydraulic solenoid switch is switched to the neutral position, the retraction and extension time of the fuel receiving probe, and the mechanical lock. If there is no rebound when the hydraulic solenoid switch is switched, and the hydraulic pulsation peak pressure is less than 10L / min, it proves that the mechanical lock of the fuel receiving probe is reliable and matches the two-way flow limiting valve.

[0043] S8. Complete set of matching records:

[0044] a. If the complete set of tests in step S7 are qualified, make good records and deliver the complete set;

[0045] b. Adjusting the flow rate of the flow-limiting valve to the minimum flow rate ensures that when the system is operating normally and the hydraulic pressure changes, the throttling effect of the flow-limiting orifice can minimize the peak value of the hydraulic pulsation. Adjusting the mechanical lock unlocking force of the fuel receiving probe to the maximum flow rate ensures the reliability of the mechanical lock under extreme conditions.

[0046] c. The final complete set of delivery is to select a small flow bidirectional flow-limiting valve that meets the retraction and extension time. The flow of the flow-limiting valve is limited to reduce the impact value of the system pressure pulsation to ensure that the system works while meeting the retraction and extension time while reducing the impact of hydraulic pulsation on the mechanical lock.

[0047] The beneficial effects of the present invention are: the present invention builds a test platform for the reliability of the mechanical lock of the oil-receiving probe, and constructs a test environment for the pulsation detection of the oil-receiving probe. It can not only accurately control the test parameters, including the working fluid flow, the test flow resistance, and the test pressure, but also record the pulsation of the return oil pressure relief in real time, solving the problem that the current test method can only record the unlocking force of the probe retracted position lock and cannot detect the reliability of the mechanical lock and monitor the return oil pulsation. This can be guaranteed through testing and adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The present invention will be further described below with reference to the accompanying drawings and examples.

[0049] Figure 1 Schematic diagram of the device structure of the present invention;

[0050] Figure 2 It is a schematic diagram of the process of the present invention;

[0051] Figure 3 This is a schematic diagram of the three-dimensional structure of the fuel receiving probe comprehensive test bench of the present invention;

[0052] Figure 4 It is a schematic diagram of the three-dimensional structure of the special frame vehicle of the present invention;

[0053] Figure 5 This is a schematic diagram of the three-dimensional structure of the probe test control cabinet and computer cabinet of the present invention;

[0054] Figure 6 This is a side view of the structure of the angle-adjustable special frame vehicle of the present invention;

[0055] Figure 7 This is a schematic diagram of the angle-adjustable special frame vehicle of the present invention from a top view. DETAILED DESCRIPTION

[0056] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below.

[0057] like Figures 1 to 7 As shown, a device for testing the reliability of a mechanical lock of an oil receiving probe comprises a dedicated angle-adjustable carriage 12 capable of adjusting the assembly angle of the oil receiving probe 11, and further comprises:

[0058] The fuel receiving probe comprehensive test bench 1 has a built-in hydraulic power source. The retraction and extension time of the fuel receiving probe 11 is adjusted by setting parameters, and the flow rate of the working fluid is controlled by the variable frequency hydraulic power source.

[0059] The hydraulic electromagnetic switch 2 is connected to the fuel receiving probe integrated test bench 1 and is used for hydraulic control and reversing;

[0060] The two-way flow limiting valve 3 is connected to the hydraulic electromagnetic switch 2 through the conduit 5 to achieve dual regulation of flow rate and flow resistance;

[0061] The pulsating pressure sensor 4 is connected to the two-way flow limiting valve 3 through the conduit 6 and is connected to the extension cavity of the oil receiving probe 11 through the conduit 7, for detecting pulsating fluctuations;

[0062] The three-way connector 13 is connected to the unlocking chamber, the retraction chamber and the hydraulic electromagnetic switch 2 of the oil receiving probe 11 through the conduit 10, the conduit 9 and the conduit 8 respectively;

[0063] The external power supply 14 is connected to the hydraulic electromagnetic switch 2 to provide a dedicated direct voltage.

[0064] The fuel receiving probe integrated test bench 1 can control the retraction and extension time of the fuel receiving probe 11 to be within 5±1s.

[0065] Specifically, the fuel receiving probe comprehensive test bench 1 is composed of a probe test control cabinet 101, a computer cabinet 102, a special frame vehicle 103, a hydraulic pump station 104, a pressurized oil tank 105, and a gas cylinder vehicle 106 arranged on the special frame vehicle 103.

[0066] Specifically, the angle-adjustable special frame vehicle 12 is composed of a vehicle body 121 , supporting legs 122 , movable casters 123 , a chuck 124 , an adjusting nut 125 , and a tightening device 126 .

[0067] Specifically, the fuel receiving probe comprehensive test bench 1 can provide two working environments: hydraulic and fuel. The built-in hydraulic power source can provide variable frequency pressure. By setting, the retraction and extension time of the probe can be adjusted to ensure that the retraction and extension time of the oil receiving probe 11 is controlled within 5±1s, thereby realizing adjustable flow of the working fluid.

[0068] Specifically, during the test, the pressure supply port of the hydraulic power source is connected to the inlet chamber of the hydraulic electromagnetic switch 2, and the return oil chamber of the hydraulic power source is connected to the return oil chamber of the hydraulic electromagnetic switch 2. The hydraulic electromagnetic switch 2 is provided with a dedicated DC voltage of 27±0.5V by the external power supply 14, which can realize hydraulic control and reversing during the working process.

[0069] The hydraulic electromagnetic switch 2 is a three-position four-way special electromagnetic switch.

[0070] Specifically, the working chamber of the hydraulic electromagnetic switch 2 is connected to the conduit 5 5 , and the conduit 5 5 is connected to the bidirectional flow limiting valve 3 . The use of bidirectional flow limiting valves 3 of different specifications can bidirectionally adjust the flow rate and flow resistance of the working fluid during the working process.

[0071] Specifically, the working chamber of the hydraulic electromagnetic switch 2 is connected to the conduit eight 8, the conduit eight 8 is connected to the three-way joint 13, the three-way joint 14 is connected to the retraction chamber of the oil receiving probe 11 through the conduit nine 9, and the conduit ten 10 is connected to the lowering position lock and unlock chamber of the oil receiving probe 11.

[0072] The two-way flow limiting valve 3 controls the flow rate of the working fluid in the range of 3 to 10 L / min during the test.

[0073] Specifically, the two-way flow limiting valve 3 is connected to the conduit 6, and the conduit 6 is connected to the pulsation pressure sensor 4. The pulsation pressure sensor 4 can monitor the pressure pulsation during the conversion process of the hydraulic electromagnetic switch 2 in real time and record the pressure pulsation curve; the conduit 7 connects the pulsation pressure sensor 4 and the extension cavity of the fuel receiving probe 11.

[0074] The external power supply 14 provides a dedicated DC voltage of 27±0.5V for the hydraulic electromagnetic switch 2.

[0075] The pulsating pressure sensor 4 is placed 550 mm away from the oil receiving probe 11 extending out of the cavity.

[0076] The catheter five 5, catheter six 6, catheter ten 10, catheter nine 9, catheter eight 8, and catheter seven 7 are all made of 1Cr18Ni10Ti material with a diameter of φ6mm. Compared with other rubber catheters, the purpose of using 1Cr18Ni10Ti is to ensure the flow resistance and pressure pulsation stability of the test environment. At the same time, the six catheters use special lengths and curved shapes to achieve a specific pulsation test environment, ensuring the accuracy and stability of the pulsation monitoring test environment.

[0077] The tilt angle of the angle-adjustable special frame vehicle 12 is controlled between 55° and 60°.

[0078] Specifically, the oil receiving probe 11 is fixed on a special angle-adjustable frame 12 to ensure that the tilt angle of the probe is controlled within the range of 55° to 60° during the test, thereby achieving angle adjustment and controllability.

[0079] A testing method for a reliability testing device for a mechanical lock of an oil receiving probe, the specific steps of which are as follows:

[0080] S1. Test piece preparation:

[0081] Prepare the fuel receiving probe integrated test bench for testing: 1. Hydraulic electromagnetic switch 2. Two-way current limiting valve 3. Pulsating pressure sensor 4. Conduit 5 5. Conduit 6 6. Conduit 7 7. Conduit 8 8. Conduit 9 9. Conduit 10 10. Fuel receiving probe 11. Special angle-adjustable stand 12. T-joint 13. External power supply 14.

[0082] S2. Test piece installation:

[0083] a. Install the oil receiving probe 11 to be adjusted onto the angle-adjustable special frame 12. Ensure that the installation angle of the fuel receiving probe is consistent with the frame. At the same time, use bolts to install the oil receiving probe 11 onto the angle-adjustable special frame 12 for fixation.

[0084] b. Connect the dedicated sets of conduits, connecting the extension chamber of the oil receiving probe 11 via conduit 7; connect a pulsating pressure sensor 4 to the extension hydraulic line of the oil receiving probe 11 to detect the hydraulic pressure pulsation value during the switching process of the hydraulic solenoid switch 2; also connect the two-way current limiting valve 3 and the hydraulic solenoid switch 2;

[0085] c. The retraction chamber and unlocking chamber of the oil receiving probe 11 are connected via a tee joint 13 and then connected to the other working chamber of the hydraulic electromagnetic switch 2 via a dedicated conduit 88. The hydraulic electromagnetic switch 2 is connected to the hydraulic pressure power source of the fuel receiving probe integrated test bench;

[0086] S3. Initial unlocking force measurement:

[0087] a. After the connection is completed, the hydraulic power source of the fuel receiving probe comprehensive test bench 1 supplies a hydraulic pressure of 10 MPa, and the hydraulic electromagnetic switch 2 is used to retract and extend the fuel receiving probe 11. Check whether the fuel receiving probe 11 moves smoothly, and retract the fuel receiving probe 11 into place;

[0088] b. Reduce the hydraulic power source pressure of the fuel receiving probe 11 to less than 1 MPa. Open the hydraulic solenoid switch 2 to supply pressure to the extension chamber of the fuel receiving probe 11. At the same time, slowly increase the pressure of the hydraulic power source. Measure the hydraulic pressure when the fuel receiving probe begins to extend. Record this as the initial unlocking pressure of the fuel receiving probe 11. Ensure that the initial unlocking force of the fuel receiving probe 11 is no less than 1.4 MPa.

[0089] S4. Determine whether the bidirectional flow limiting valve meets the minimum flow rate during the retraction and extension time:

[0090] a. Increase the hydraulic power source pressure of the fuel receiving probe integrated test bench 1 to 28MPa, and the test bench oil flow rate shall be no less than 15L / min;

[0091] b. Select flow limiting valves with different flow rates and measure the minimum flow limiting valve that meets the retraction and extension time of the fuel receiving probe 11. Use the minimum flow limiting valve that meets the retraction and extension time of the fuel receiving probe 11 by 5±1s and record the flow rate of the flow limiting valve;

[0092] S5. Verify the reliability of the mechanical lock under high flow;

[0093] a. Increase the supply pressure of the hydraulic power source of the fuel receiving probe integrated test bench 1 to 28MPa, with a fuel flow rate of no less than 15L / min, and select a two-way flow limiting valve with a flow rate of 10L / min;

[0094] b. After the receiving probe 11 is retracted and mechanically locked, check whether the fuel receiving probe is unlocked and extended when the hydraulic solenoid switch 2 switches from supplying pressure to the retraction chamber of the fuel receiving probe 11 to the neutral position. Record the peak value of the hydraulic pulsation when the hydraulic solenoid switch 2 switches from supplying pressure to the retraction chamber to the neutral position.

[0095] S6. Adjustment of the mechanical lock of the fuel receiving probe:

[0096] a. If extension occurs during the test in step S5, increase the unlocking force by adding an adjustment washer for the rectangular spring in the hydraulic actuator of the fuel receiving probe to ensure that the hydraulic pulse value during the switching of the hydraulic solenoid switch 2 does not cause the fuel receiving probe to extend due to the impact;

[0097] b. If adding an adjustment shim does not resolve the rebound extension, adjust the situation by replacing the worn piston and steel ball clamp in the fuel receiving probe 11. Unworn pistons and steel ball clamps have a relatively large travel when unlocking, and their mating areas with the steel ball are less worn, resulting in greater friction and a relatively large but stable unlocking force. Record the peak value of the hydraulic pulsation when the hydraulic solenoid switch is shifted from supplying pressure to the retraction chamber to the neutral position.

[0098] S7. Verification of mechanical lock reliability and compatibility:

[0099] a. Using the flow limiting valve determined in step S4, increase the supply pressure of the hydraulic power source of the fuel receiving probe integrated test bench 1 to 28 MPa, with a supply flow rate of no less than 15 L / min;

[0100] b. Measure the retraction and extension time of the fuel receiving probe 11 to see if it complies with 5±1s. At the same time, after the probe 11 is retracted into position and the hydraulic solenoid switch 2 switches from supplying pressure to the retraction chamber of the fuel receiving probe to the neutral position, check whether the fuel receiving probe is unlocked and extended.

[0101] c. Record the peak hydraulic pulsation pressure when the hydraulic solenoid switch 2 is switched to the neutral position, the retraction and extension time of the fuel receiving probe 11, and the mechanical lock's absence of rebound when the hydraulic solenoid switch is switched. If the peak hydraulic pulsation pressure is less than 10 L / min, this indicates that the fuel receiving probe's mechanical lock is reliable and matches the two-way flow limiting valve.

[0102] S8. Complete set of matching records:

[0103] a. If the complete set of tests in step S7 are qualified, make good records and deliver the complete set;

[0104] b. Adjusting the flow rate of the flow-limiting valve to the minimum flow rate ensures that when the system is operating normally and the hydraulic pressure changes, the throttling effect of the flow-limiting hole can minimize the peak value of the hydraulic pulsation. Adjusting the mechanical lock unlocking force of the fuel receiving probe 11 to the maximum flow rate ensures the reliability of the mechanical lock under extreme conditions.

[0105] c. The final delivery system features a low-flow, bidirectional flow-limiting valve 3 that meets the retraction and extension timeframe. This valve flow limit reduces the system's pressure pulsation impact, ensuring the system operates within the retraction and extension timeframe while minimizing the impact of hydraulic pulsation on the mechanical lock. Furthermore, the mechanical lock reliability under hydraulic pulsation conditions is ensured, ensuring that hydraulic shock conditions and mechanical lock unlocking conditions do not overlap repeatedly, ensuring optimal system matching. This ensures both the retraction and extension timeframe and reduces abnormal wear caused by excessive mechanical lock unlocking force. The reliability of the oil receiving probe is ensured by the test methods used in the constructed test rig.

[0106] The specification of the bidirectional flow limiting valve 3 is 8L / min-10L / min.

[0107] The test hydraulic power source is 0-28MPa, 15L / min.

[0108] The present invention builds a test platform for the reliability of the mechanical lock of the oil receiving probe and constructs a test environment for the pulsation detection of the oil receiving probe. It can not only accurately control the test parameters, including the working fluid flow rate, test flow resistance, and test pressure, but also record the pulsation of the return oil pressure relief in real time.

[0109] It solves the problem that the current test method can only record the unlocking force of the probe tube in the retracted position and cannot simulate the actual working conditions to detect the reliability of the mechanical lock and monitor the influence of the return oil pressure pulsation value during the conversion of the hydraulic electromagnetic switch. It ensures the optimal matching state of the mechanical lock, which not only guarantees the retraction and extension time, but also reduces the impact of hydraulic pressure pulsation. At the same time, it optimizes the upper limit of the mechanical lock unlocking force adjustment and reduces the abnormal wear problem caused by excessive mechanical lock unlocking force.

[0110] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and description merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A reliability test device for a mechanical lock of an oil receiving probe, characterized by: It includes a special angle-adjustable frame vehicle (12) capable of adjusting the assembly angle of the oil receiving probe (11), and further includes: The fuel receiving probe integrated test bench (1) has a built-in hydraulic power source, which adjusts the retraction and extension time of the fuel receiving probe (11) by setting parameters, and controls the flow rate of the working fluid by using a variable frequency hydraulic power source; A hydraulic electromagnetic switch (2) is connected to the fuel receiving probe integrated test bench (1) and is used for hydraulic control and reversing; A two-way flow limiting valve (3) is connected to the hydraulic electromagnetic switch (2) via a conduit (5) to achieve dual regulation of flow rate and flow resistance; A pulsation pressure sensor (4) is connected to the two-way flow limiting valve (3) through a conduit six (6) and is connected to the extension cavity of the oil receiving probe (11) through a conduit seven (7) for detecting pulsation fluctuations; The three-way connector (13) is connected to the unlocking chamber, the retraction chamber and the hydraulic electromagnetic switch (2) of the oil receiving probe (11) through the conduit ten (10), the conduit nine (9) and the conduit eight (8); The external power supply (14) is connected to the hydraulic electromagnetic switch (2) to provide a dedicated DC voltage.

2. The oil probe mechanical lock reliability testing device according to claim 1, characterized in that: The fuel receiving probe integrated test bench (1) can control the retraction and extension time of the fuel receiving probe (11) to be within 5±1s.

3. The oil probe mechanical lock reliability testing device according to claim 1, characterized in that: The hydraulic electromagnetic switch (2) is a three-position four-way special electromagnetic switch.

4. The oil probe mechanical lock reliability testing device according to claim 1, characterized in that: The two-way flow limiting valve (3) controls the flow rate of the working fluid in the range of 3 to 10 L / min during the test.

5. The oil probe mechanical lock reliability testing device according to claim 1, characterized in that: The external power supply (14) provides a dedicated DC voltage of 27±0.5V for the hydraulic electromagnetic switch (2).

6. The oil probe mechanical lock reliability testing device according to claim 1, characterized in that: The distance between the pulsating pressure sensor (4) and the oil receiving probe (11) extending out of the cavity is 550 mm.

7. The oil probe mechanical lock reliability testing device according to claim 1, characterized in that: The catheter five (5), catheter six (6), catheter ten (10), catheter nine (9), catheter eight (8), and catheter seven (7) are all made of 1Cr18Ni10Ti material and have a diameter of φ6mm.

8. The oil probe mechanical lock reliability testing device according to claim 1, characterized in that: The tilt angle of the angle-adjustable special frame vehicle (12) is controlled between 55° and 60°.

9. The oil probe mechanical lock reliability testing device according to claim 1, characterized in that: The specification requirement of the bidirectional flow limiting valve (3) is 8L / min-10L / min.

10. A testing method using the oil probe mechanical lock reliability testing device according to any one of claims 1 to 9, characterized in that: The specific steps are as follows: S1. Test piece preparation: Prepare the fuel receiving probe integrated test bench (1), hydraulic electromagnetic switch (2), two-way flow limiting valve (3), pulsating pressure sensor (4), conduit five (5), conduit six (6), conduit seven (7), conduit eight (8), conduit nine (9), conduit ten (10), fuel receiving probe (11), angle-adjustable special frame (12), three-way connector (13), and external power supply (14); S2. Test piece installation: a. Install the oil receiving probe (11) to be adjusted on the angle-adjustable special frame (12), ensuring that the installation angle of the oil receiving probe (11) is consistent with that of the angle-adjustable special frame, and use bolts to install the oil receiving probe (11) on the angle-adjustable special frame (12) for fixing; b. Connect the dedicated sets of conduits and connect the extension chamber of the oil receiving probe (11) through conduit seven (7); connect the pulsating pressure sensor (4) to the extension hydraulic pipeline of the oil receiving probe (11) to detect the hydraulic pressure pulsation value during the switching process of the hydraulic electromagnetic switch (2); and simultaneously connect the two-way flow limiting valve (3) and the working chamber of the hydraulic electromagnetic switch (2); c. The retraction chamber and the unlocking chamber of the oil receiving probe (11) are connected through a three-way joint (13) and then connected to the other working chamber of the hydraulic electromagnetic switch (2) through a dedicated conduit eight (8). The hydraulic electromagnetic switch (2) is connected to the hydraulic power source of the fuel receiving probe integrated test bench (1); S3. Initial unlocking pressure measurement: a. After the connection is completed, the hydraulic power source of the fuel receiving probe integrated test bench (1) supplies a pressure of 10 MPa, and the hydraulic electromagnetic switch (2) is used to retract and extend the fuel receiving probe (11), and check whether the fuel receiving probe (11) moves smoothly, and retract the fuel receiving probe (11) into place; b. Reduce the pressure of the hydraulic power source of the oil receiving probe (11) to less than 1 MPa, open the hydraulic electromagnetic switch (2) to supply pressure to the extension chamber of the oil receiving probe (11), and slowly increase the pressure of the hydraulic power source. Measure the hydraulic pressure when the oil receiving probe (11) begins to extend and record it as the initial unlocking pressure of the oil receiving probe (11). Ensure that the initial unlocking pressure of the oil receiving probe (11) is not less than 1.4 MPa. S4. Determine the minimum flow rate of the two-way flow limiting valve to meet the retraction and extension time: a. Increase the hydraulic power source pressure of the fuel receiving probe integrated test bench (1) to 28MPa, and the test bench oil flow rate shall not be less than 15L / min; b. Select flow limiting valves with different flow rates and measure the minimum flow rate of the flow limiting valve that satisfies the retraction and extension time of the oil receiving probe (11); use the minimum flow rate of the flow limiting valve that satisfies the retraction and extension time of the oil receiving probe (11) of 5±1s and record the flow rate of the flow limiting valve; S5. Verify the reliability of the mechanical lock under high flow; a. Increase the hydraulic power source pressure of the fuel receiving probe integrated test bench (1) to 28 MPa, with a fuel flow rate of no less than 15 L / min, and select a two-way flow limiting valve with a flow rate of 10 L / min; b. After the oil receiving probe (11) is retracted into place, when the mechanical lock switches from supplying pressure to the retraction chamber of the oil receiving probe (11) to the neutral position, check whether the oil receiving probe (11) is unlocked and extended, and record the peak value of the hydraulic pulsation when the hydraulic electromagnetic switch (2) supplies pressure to the retraction chamber and switches to the neutral position; S6. Adjustment of the mechanical lock of the oil receiving probe: a. If the extension occurs during the test in step S5, increase the unlocking force by adding an adjustment washer to the rectangular spring in the hydraulic actuator of the oil receiving probe to ensure that the hydraulic pulse value during the switching of the hydraulic electromagnetic switch (2) does not cause the oil receiving probe to extend due to the impact; b. When adding an adjustment gasket cannot solve the rebound extension problem, the worn piston and steel ball clamp in the oil probe (11) are replaced for adjustment. The unworn piston and steel ball clamp have a relatively large movement stroke when unlocking. At the same time, the matching parts with the steel ball are less worn, the friction force is greater, and the unlocking force value is relatively large while being relatively stable. The peak value of the hydraulic pulsation when the hydraulic electromagnetic switch supplies pressure to the retraction chamber and switches to the neutral position is recorded; S7. Verification of mechanical lock reliability and compatibility: a. Using the flow limiting valve with the flow rate determined in step S4, increase the hydraulic power source pressure of the fuel receiving probe integrated test bench (1) to 28 MPa, with the oil flow rate not less than 15 L / min; b. Measure whether the retraction and extension time of the oil receiving probe (11) complies with 5±1s. At the same time, after the oil receiving probe (11) is retracted into place, when the mechanical lock of the hydraulic electromagnetic switch (2) switches from supplying pressure to the retraction chamber of the oil receiving probe (11) to the neutral position, check whether the oil receiving probe (11) is unlocked and extended; c. Record the peak pressure of hydraulic pulsation when the hydraulic electromagnetic switch (2) is switched to the neutral position. The retraction and extension time of the oil receiving probe (11) is 5±1s. The mechanical lock does not rebound when the hydraulic electromagnetic switch is switched. The peak pressure of hydraulic pulsation is less than 10L / min. This proves that the mechanical lock of the oil receiving probe is reliable and matches the two-way flow limiting valve. S8. Complete set of matching records: a. If the mechanical lock reliability and compatibility verification test in step S7 is qualified, record it and deliver it as a complete set; b. Adjusting the flow value of the flow limiting valve according to the minimum flow can ensure that when the hydraulic pressure changes during the normal operation of the system, the throttling effect of the flow limiting hole can minimize the peak value of the hydraulic pulsation; adjusting the mechanical lock unlocking force of the oil receiving probe (11) according to the maximum flow can ensure the reliability of the mechanical lock in extreme conditions; c. The final set of delivery is to select a small flow bidirectional flow limiting valve (3) that meets the retraction and extension time. Limit the flow of the flow limiting valve to reduce the impact value of the system pressure pulsation, ensure that the system works while meeting the retraction and extension time, and reduce the impact of hydraulic pulsation on the mechanical lock.

Images