This standard specifies the terms, classification, technical requirements, test methods, inspection rules, signs, packaging, storage and transportation of air springs for railway vehicles.
This standard applies to new air springs for railway vehicles. Air springs for other rail vehicles such as subways, light rails, and trains can be referred to for use.
skills requirement:
1, the use of air springs at ambient temperature -40 °C -50 °C.
2, air springs should be able to adapt to the requirements of the vehicle operating environment.
3, the common maximum working pressure of air spring is 0.5MPa.
4. The cross-section of the air spring capsule, the thickness of the inner layer, the middle layer, and the outer layer of the longitudinal section, the density, the angle and the cord evenness of the ply should meet the design requirements, and the position of the ply should be the part with the greatest force.
5. The vertical and horizontal stiffness of air springs should meet the requirements of users; air springs with damping devices should have damping values ​​that meet the requirements of users.
6. The internal pressure of the air spring should not be lower than 2.0 MPa.
7. In the air spring airtightness test, under the pressure of 0.5MPa, after the pressure is stable, the pressure is maintained for 10min, the internal pressure drop should not exceed 0.01MPa, or there is no continuous bubble; in the low temperature airtightness test , Pressure 10min, internal pressure drop should not exceed 0.02MPao.
8. No leakage and abnormal deformation phenomenon should be applied to the air spring horizontal large displacement test without bolster structure bogie.
9. After the air spring fatigue test is over, the appearance of the air spring should not be abnormal such as bulges or cracks. The surface of the rubber bladder should not be worn out until the cord is exposed.
Air spring characteristic test:
1. Vertical static stiffness test The air spring is placed at a standard height and filled with compressed air of 0.1 MPa, 0.2 MPa, 0.3 MPa, 0.4 MPa, and 0.5 MPa. At each air pressure, the vibration frequency is set to 0.02 Hz. 30mm (or according to the specific structure and size) the load and displacement relationship in the vertical stroke, thereby determining the vertical static stiffness of the air spring.
The test was conducted in the absence of additional air chambers and additional air chambers.
2. Lateral static stiffness test: The air spring is kept at a standard height, filled with compressed air of 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa, and 0.5MPa. At each air pressure, the vibration frequency is set to 0.02Hz. 30mm - 30~ horizontal stroke within the load and displacement relationship, thereby determining the horizontal static stiffness of the air spring.
The test is carried out with a combination of two air springs. It can also be done with a single air spring.
3. Vertical dynamic stiffness and damping coefficient test The air spring is kept at a standard height and filled with compressed air of 0.1 MPa, 0.2 MPa, 0.3 MPa, 0.4 MPa, and 0.5 MPa. Under each air pressure, the amplitude of the air spring is taken as 10mm, frequency is 0.5Hz-3Hz vertical vibration, draw a load-displacement curve, which determines the vertical dynamic stiffness and damping coefficient of the air spring.
The test was conducted in the absence of additional air chambers and additional air chambers.
4. Lateral dynamic stiffness test The air spring is kept at a standard height, filled with compressed air of 0.1 MPa, 0.2 MPa, 0.3 MPa, 0.4 MPa, and 0.5 MPa. Under each air pressure, the air spring has an amplitude of 10 mm and the frequency is 0.5Hz-V1Hz horizontal vibration, draw a load-displacement curve, which determines the horizontal dynamic stiffness of the air spring.
The test can be performed with two air spring combinations, or with a single air spring.
For more details, please contact: Jinan Zhongchuang Industrial Testing System Co., Ltd. Technical Department
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