Guidelines for Performance And Reliability Testing of Rotary Joints

To assess the sealing performance and reliability of rotary joints, the following aspects can be considered:

1、 Testing sealing performance

①　Leakage rate detection:

Leakage rate refers to the amount of dielectric material leaked from a joint per unit time.  It can be measured using specialized leak rate testing equipment, typically in units of cm ³/(s · Pa) or mL/min.  A lower leakage rate indicates better sealing performance.

②　Leakage pressure test:

Leakage pressure refers to the pressure value at which the connector leaks.  A certain pressure can be applied to the joint through a pressure testing device and observed for any leakage.  A higher leakage pressure indicates that the joint has good compressive strength.

③　Airtightness or liquid tightness test:

Inject gas or liquid into the rotary joint and control a certain pressure to observe if there is any leakage at the joint.  This can be accomplished through visual inspection or the use of a leak detector.

④　Immersion test:

Soak the rotary joint in the medium and observe for any bubbles to determine if the joint is leaking.  This testing method is particularly effective for detecting small leaks.

2、 Assess reliability

①　Durability testing:

Simulate actual usage conditions and conduct long-term operation tests on the rotary joint to observe its sealing performance and stability.  Durability testing can reveal the wear and performance degradation of joints during long-term use.

②　Temperature cycling test:

Load and unload tests on rotating joints under different temperature conditions to evaluate their temperature resistance performance.  This helps ensure that the joint can maintain good sealing performance in high or low temperature environments.

③　Torque test:

Measure the response and stability of rotary joints under different torques.  Torque testing can reveal the deformation and sealing performance changes of joints under stress.

④　Vibration test:

Simulate vibration conditions in actual working environments and conduct vibration tests on rotating joints.  This helps evaluate the sealing performance and stability of the joint under vibration conditions.

3、 Other testing items

①　Appearance inspection:

Check the appearance of the rotary joint for completeness, no cracks, scratches, deformation, or other issues.  This helps identify potential manufacturing defects or damages.

②　Dimensional inspection:

Measure the geometric dimensions of the rotary joint, such as length, width, thickness, etc., to ensure that it meets the design requirements.  Dimensional deviation may lead to a decrease in sealing performance.

③　Material testing:

Perform chemical analysis or mechanical property testing on the material of the rotary joint to ensure that it meets the specified material standards.  The quality of materials directly affects the sealing performance and reliability of joints.

4、 Follow relevant standards and specifications

When judging the sealing performance and reliability of rotary joints, relevant industry standards and specifications should also be followed.  For example, reference can be made to standards related to rotary joints such as JB/T, which specify the terminology and definitions, structural types, technical parameters, inspection methods, and other requirements for rotary joints.

In summary, by comprehensively utilizing various detection methods, evaluation methods, and following relevant standards and specifications, the sealing performance and reliability of rotary joints can be comprehensively judged.  This will help ensure the stability and safety of the rotary joint in practical applications.