A method for testing the sealing of marine steering gear

Abstract

This invention proposes a seal testing method for marine rotary vane steering gears, specifically a run-in test for steering gear seals. This test measures the functional relationship between the wear of the seal structure or seal ring and the run-in time at different PV values, thereby indirectly verifying the seal's service life. This seal testing method can be used to establish a reliable seal testing platform, allowing for the study of seal reliability and durability under various seal structure types and materials, thereby ensuring the service life of the sealing device.

Description

Technical Field

[0001] The invention relates to the field of marine rotary vane steering gears, in particular to a sealing test method for marine steering gears. Background Art

[0002] Sealing technology for rotary vane servos is a key challenge hindering their development and represents the core technology of rotary vane servos. The sealing structure and sealing materials are key factors influencing sealing performance. Whether the material selection is correct and whether the sealing structure meets the actual operating requirements of the servo requires verification through sealing tests. Without these tests, all design and selection is meaningless.

[0003] At present, the most common tests for steering gear seals are dynamic seal test and static seal test. Other tests are rarely performed and are usually only carried out in specific sealing research institutes. Summary of the Invention

[0004] To address these existing issues, the applicant has conducted research and developed a method for testing seals for marine rotary vane steering gears. This method verifies the functional relationship between seal wear and run-in time, known as a run-in test. This method effectively verifies the functional relationship between seal wear and run-in time for a seal structure or seal ring at different PV values, thereby indirectly verifying the service life of the seal.

[0005] A method for verifying the service life of a marine rotary vane steering gear seal is proposed. A functional relationship between the wear amount and the running-in time of the marine rotary vane steering gear seal at different PV values ​​is established, and the service life of the seal is calculated and verified through the functional relationship.

[0006] The technical solution further defined in the present invention is:

[0007] Furthermore, the seals were tested for wear of cylindrical pin specimens under six working conditions, including at least two required pressures of 6 MPa and 12 MPa and at least three rotational speeds of 28S65°, 14S65°, and 7S65°, and the wear amount-wear time curves were drawn.

[0008] Furthermore, the rotation speed of the rotating drum was set to 28S65°, the speed variable was controlled to be constant, and the applied pressure was changed gradually, thereby measuring the wear amount of the seal sample under the working condition of 6MPa at the speed of 28S65°;

[0009] After the polyurethane test preparation is completed and the sample surface is cleaned, the equipment is inspected and adjusted. The speed is 28S65°, the speed variable is controlled constant, the pressure is applied with a gradient change, and the wear amount of the seal sample is measured under the working condition of contact pressure of 12MPa.

[0010] After the polyurethane test preparation is completed and the sample surface is cleaned, the equipment is inspected and adjusted. The speed is 14S65°, the speed variable is controlled constant, the pressure is applied with a gradient change, and the wear amount of the seal sample is measured under the working condition of 6MPa contact pressure.

[0011] After the polyurethane test preparation is completed and the sample surface is cleaned, the equipment is inspected and adjusted. The speed is 14S65°, the speed variable is controlled constant, the pressure is applied with a gradient change, and the wear amount of the seal sample is measured under the working condition of contact pressure of 12MPa.

[0012] After the polyurethane test preparation is completed and the sample surface is cleaned, the equipment is inspected and adjusted. The speed is 7S65°, the speed variable is controlled constant, the pressure is applied with a gradient change, and the wear amount of the seal sample is measured under the working condition of contact pressure 6MPa.

[0013] After the polyurethane test preparation is completed and the sample surface is cleaned, the equipment is inspected and adjusted. The speed is controlled at 7S65°, the speed variable is constant, the pressure is applied with gradient change, and the wear amount of the seal sample under the working condition of contact pressure of 12MPa.

[0014] Furthermore, after the polyurethane test equipment is completed and the sample surface is cleaned, the equipment is inspected and adjusted, a predetermined speed is set, the speed variable is controlled to be constant, the pressure is applied with a gradient change, and finally the preset contact pressure is reached. The test steps are as follows:

[0015] 1) Measure the original data of the polyurethane sample according to relevant tests and product standards, such as the mass, length, width and glossiness of the sample before the test;

[0016] 2) Check the wear device, calibrate the wear device level, and add or apply hydraulic oil to the inside of the rotating roller;

[0017] 3) Use the heating system to preheat the rotating roller to reach the sample environment temperature of 70°C;

[0018] 4) Install the polyurethane sample on the mounting arm and adjust the contact position with the rotating roller;

[0019] 5) Lower the mounting arm, gently contact the sample with the rotating drum turntable, adjust the wear machine equipment, and adjust the load and speed to the specified values;

[0020] 6) Set and control the contact pressure level and the rotating roller speed value;

[0021] 7) Turn on the rotary switch to rotate the rotary roller and wear the sample according to the designed time;

[0022] 8) When the designed wear time is reached, stop the equipment, take out the sample and weigh the wear amount using an electronic analytical balance;

[0023] 9) Draw a point diagram of wear amount-wear time based on the test measurement data, and fit the data to the wear amount-wear time function and curve.

[0024] Furthermore, the rotating drum was set to a low speed and low pressure condition of 28s65° and a contact pressure of 6MPa. The wear degree of the specimen was low. The wear interval under this condition was 48h. The overall wear cycle of the specimen under this condition was about 250h.

[0025] Furthermore, when using ductile iron rotating rollers, the roller surface is polished smooth using a grinding machine before the test to ensure that the grinding surface and side edges of the roller turntable are not sharp or rough, and there are no defects in the curvature radius.

[0026] Furthermore, when the exposed end of the polyurethane specimen is about to be worn out, the exposed length of the specimen on the mounting arm should be adjusted in time to avoid loss of test data and damage to the testing machine.

[0027] Furthermore, the wear residue in the rotating roller should be cleaned on time, and the working status of the wear testing machine and the wear status of the sample should be checked on time.

[0028] The beneficial effects of the present invention are as follows:

[0029] The present invention is easy to assemble and has a simple test method. By simulating the six common operating conditions of the above-mentioned steering gears, the functional relationship between the wear amount and the wear time is obtained, which indirectly verifies the service life of the seal. By understanding the service life, improvements can be made in the material selection and structural optimization of the steering gear seal, thereby improving the sealing performance of the steering gear and extending the service life of the steering gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The test specimen is a polyurethane cylindrical pin specimen.

[0031] Figure 2 The test specimen is a ductile iron friction disc.

[0032] Figure 3 The test equipment is a friction and wear testing machine.

[0033] Figure 4 Rotating roller for test equipment.

[0034] Figure 5 The experimental equipment is a micro electronic analytical balance.

[0035] The technical solutions adopted in the present invention are as follows:

[0036] 1. Test equipment

[0037] The test equipment includes: friction and wear tester, tester heating system, D&T micro electronic analytical balance (see Figure 3 、 Figure 4 、 Figure 5 )

[0038] 2. Test Materials

[0039] Polyurethane cylindrical pin specimen, ductile iron friction disc, hydraulic oil medium (see Figure 1 、 Figure 2 )

[0040] 3. Test Environment

[0041] The working environment of the servo seal is normally below 70℃ (limit temperature) in the hydraulic oil. Considering the most unfavorable wear conditions, the specimen environment temperature (i.e. the temperature of the specimen infiltrated by the oil) in this wear test will be controlled at 70℃. The specimen wear amount is measured at normal room temperature.

[0042] (1) Sample environment: immersion in 70°C hydraulic oil, with pressure applied.

[0043] (2) Laboratory environment: room temperature 20±5℃, humidity 65±5%.

[0044] 4. Test methods

[0045] Its further technical solution is:

[0046] The wear test of the sealing polyurethane material sample will be carried out under the required two pressures (6MPa, 12MPa) and three rotation speeds (28S65°, 14S65°, 7S65°), a total of 6 working conditions, to measure the wear of the polyurethane material cylindrical pin sample and draw the wear amount-wear time curve.

[0047] First, the speed of the rotating drum was set to 28S (65°), the speed variable was controlled to be constant, and the applied pressure was changed gradiently. The wear amount of the polyurethane sample under the working conditions of 6MPa and 12MPa at the speed of 28S (65°) was measured respectively.

[0048] Furthermore, after the polyurethane test equipment is completed and the sample surface is cleaned, the equipment is inspected and adjusted. The test steps for a speed of 28s (65°) and a contact pressure of 6MPa are as follows:

[0049] 1) Measure the original data of the polyurethane sample according to relevant tests and product standards, such as the mass, length, width and glossiness of the sample before the test;

[0050] 2) Check the wear device, calibrate the wear device level, and add or apply hydraulic oil to the inside of the rotating roller;

[0051] 3) Use the heating system to preheat the rotating roller to reach the sample environment temperature of 70°C;

[0052] 4) Install the polyurethane sample on the mounting arm and adjust the contact position with the rotating roller;

[0053] 5) Lower the mounting arm, gently contact the sample with the rotating roller turntable, adjust the wear machine equipment, and adjust the load and speed to the specified values;

[0054] 6) Set and control the contact pressure to 6 MPa, and set the rotating roller speed to 28S (65°) (2.32° / s);

[0055] 7) Turn on the rotary switch to rotate the rotary roller and wear the sample according to the designed time;

[0056] 8) When the designed wear time is reached, stop the equipment, take out the sample and weigh the wear amount using an electronic analytical balance;

[0057] 9) Due to the low speed and low pressure conditions of the working condition of 28s 65° and contact pressure 6MPa, the degree of wear of the specimen is relatively low. The wear volume interval under this working condition is 48h, and the overall wear cycle of the specimen under this working condition is about 250h.

[0058] 10) When using ductile iron rotating rollers, the roller surface should be polished smooth with a grinding machine before testing, and ensure that the grinding surface and side edges of the roller turntable are not sharp or rough, and there are no defects in the curvature radius;

[0059] 11) When the exposed end of the polyurethane specimen is about to be worn out, the exposed length of the specimen on the mounting arm should be adjusted in time to avoid loss of test data and damage to the testing machine;

[0060] 12) Clean the wear residue in the rotating roller on time, and check the working status of the wear tester and the wear status of the sample on time;

[0061] 13) Draw a point diagram of wear amount-wear time based on the test measurement data, and fit the data to the wear amount-wear time function and curve.

[0062] Furthermore, after the polyurethane test preparation is completed and the sample surface is cleaned, the equipment is inspected and adjusted, and the test steps for the rotation speed of 28s (65°) and the contact pressure of 12MPa are the same as above;

[0063] Furthermore, after the polyurethane test preparation is completed and the sample surface is cleaned, the equipment is inspected and adjusted, and the test steps for the rotation speed of 14s (65°) and the contact pressure of 6MPa are the same as above;

[0064] Furthermore, after the polyurethane test preparation is completed and the sample surface is cleaned, the equipment is inspected and adjusted, and the test steps for the rotation speed of 14s (65°) and the contact pressure of 12MPa are the same as above;

[0065] Furthermore, after the polyurethane test preparation is completed and the sample surface is cleaned, the equipment is inspected and adjusted, and the test steps for the rotation speed 7s (65°) and contact pressure 6MPa are the same as above;

[0066] Furthermore, after the polyurethane test preparation is completed and the sample surface is cleaned, the equipment is inspected and adjusted, and the test steps for the speed 7s (65°) and contact pressure 12MPa are the same as above;

[0067] The above are simulation tests conducted under the six common working conditions of servos, which can effectively simulate the functional relationship between wear amount and wear time in wear tests.

Claims

1. A method for verifying the service life of a marine rotary vane steering gear seal, characterized by: Establish a functional relationship between the wear and running-in time of marine rotary vane steering gear seals at different PV values, and verify the service life of the seals through calculation of the functional relationship; The seal is tested for wear of cylindrical pin specimens under six working conditions, namely, at least two required pressures of 6 MPa and 12 MPa and at least three required rotational speeds of 28S65°, 14S65°, and 7S65°, and the wear amount-wear time curve is drawn. The rotating drum speed was set to 28S65°, the speed variable was kept constant, and the applied pressure was changed gradually. The wear of the seal specimens under the working condition of 6MPa at the speed of 28S65° was measured. After the polyurethane test preparation is completed and the sample surface is cleaned, the equipment is inspected and adjusted. The speed is 28S65°, the speed variable is controlled constant, the pressure is applied with a gradient change, and the wear amount of the seal sample is measured under the working condition of contact pressure of 12MPa. After the polyurethane test preparation is completed and the sample surface is cleaned, the equipment is inspected and adjusted. The speed is 14S65°, the speed variable is controlled constant, the pressure is applied with a gradient change, and the wear amount of the seal sample is measured under the working condition of 6MPa contact pressure. After the polyurethane test preparation is completed and the sample surface is cleaned, the equipment is inspected and adjusted. The speed is 14S65°, the speed variable is controlled constant, the pressure is applied with a gradient change, and the wear amount of the seal sample is measured under the working condition of contact pressure of 12MPa. After the polyurethane test preparation is completed and the sample surface is cleaned, the equipment is inspected and adjusted. The speed is 7S65°, the speed variable is controlled constant, the pressure is applied with a gradient change, and the wear amount of the seal sample is measured under the working condition of contact pressure 6MPa. After the polyurethane test preparation is completed and the sample surface is cleaned, the equipment is inspected and adjusted. The speed is controlled at 7S65°, the speed variable is constant, the pressure is applied with gradient change, and the wear amount of the seal sample under the working condition of contact pressure of 12MPa.

2. The method for verifying the service life of a marine rotary vane steering gear seal according to claim 1, characterized in that: After the polyurethane test equipment is completed and the sample surface is cleaned, the equipment is inspected and adjusted, the predetermined speed is set, the speed variable is controlled to be constant, the pressure is applied in a gradient change, and the test steps to finally reach the preset contact pressure are as follows: 1) Measure the original data of the polyurethane sample in accordance with relevant tests and product standards, including the mass, length, width and gloss of the sample before the test; 2) Check the wear device, calibrate the wear device level, and add or apply hydraulic oil to the inside of the rotating roller; 3) Use the heating system to preheat the rotating roller to reach the sample environment temperature of 70°C; 4) Install the polyurethane sample on the mounting arm and adjust the contact position with the rotating roller; 5) Lower the mounting arm, gently contact the sample with the rotating roller turntable, adjust the wear machine equipment, and adjust the load and speed to the specified values; 6) Set and control the contact pressure level and the rotating roller speed value; 7) Turn on the rotary switch to rotate the rotary roller and wear the sample according to the designed time; 8) When the designed wear time is reached, stop the equipment, take out the sample and weigh the wear amount using an electronic analytical balance; 9) Draw a point diagram of wear amount-wear time based on the test measurement data, and fit the data to the wear amount-wear time function and curve.

3. The method for verifying the service life of a marine rotary vane steering gear seal according to claim 1, characterized in that: The rotation speed of the rotating drum is set to 28s65° and the contact pressure is 6MPa. The wear measurement interval under this working condition is 48h, and the overall wear cycle of the sample under this working condition is 250h.

4. The method for verifying the service life of a marine rotary vane steering gear seal according to claim 2, characterized in that: When using ductile iron rotating rollers, use a grinding machine to grind the roller surface smooth before testing to ensure that the grinding surface and side edges of the roller turntable are not sharp or rough, and there are no defects in the curvature radius.

5. The method for verifying the service life of a marine rotary vane steering gear seal according to claim 2, characterized in that: When the exposed end of the polyurethane specimen is about to be worn out, adjust the exposed length of the specimen on the mounting arm in time.

6. The method for verifying the service life of a marine rotary vane steering gear seal according to claim 2, characterized in that: Clean the wear residue in the rotating roller on time, and check the working status of the wear testing machine and the wear status of the sample on time.

Images