Introduce:

The serpentine spring coupling is a structural metal coupling that transmits torque by means of a serpentine spring. It has good vibration damping performance, long service life, large load fluctuation, easy starting; transmission, running, low noise, good lubrication, simple structure, convenient assembly and disassembly, and large installation deviation is allowed. Although the serpentine coupling has so many features and advantages, many brother units have changed it. As the user unit of serpentine spring coupling, our company did not imitate it, but used it, and received good results. Two 3D-T34/13.5 high-pressure pumps have been running smoothly since they were put into use in 1997.

The serpentine spring coupling should pay attention to the following aspects in use:

1. Installation alignment, reasonable deviation control

Although the serpentine spring coupling allows a large installation deviation, it should also be within the specified value during installation.

(1) For the alignment of the gap and angular deviation between the two-lobed couplings, measure the gap between the two-lobed couplings every 90° during installation, and the difference between the maximum value and the minimum value shall not exceed 0.38mm.

(2) Correction of radial deviation. Use a straightedge to place on the two-petal coupling, measure it every 90°, and check with a match ruler. The radial deviation does not exceed 0.38mm.

2. Select the appropriate lubricating grease

The temperature of the oil injection point is ≥150°C, which can resist centrifugal force, has separation stability, no impurities, and does not corrode carbon steel and nitrile rubber. Lithium-based grease is better.

3. Fill with sufficient amount of grease

Sufficient grease is important for the coupling to work, and it is recommended to check it once a year. Grease with a dry grease gun until excess grease escapes in the hole.

The failure mode of the coupling is related to the type of the coupling, and also related to the working conditions of the coupling, which can be summed up.

Couplings have three main modes of failure:

1. Some components in the coupling are damaged due to insufficient fatigue strength or short-term overload, resulting in interruption of the two-axis connection. For example, the rubber element in the rubber elastic coupling is fatigue-fractured or the bonding surface with the metal is torn off under the action of variable stress. Another example is that the pins and bolts in the rigid coupling are cut off.

2. The writing elements in the coupling are deformed too much or severely worn during work. Although in this case, the connection of the two shafts is not interrupted, the performance of the coupling is significantly deteriorated, the additional dynamic load of the transmission system increases sharply, or serious noise occurs, and even the shaft system vibrates. If in this case, continue to run, it will also cause damage to other components of the transmission system. Therefore, it is generally necessary to stop the machine for inspection, replace the relevant components, and re-adjust.

3. The abnormal operation of certain components in the coupling causes failure of other parts adjacent to the coupling. For example, the rubber element in the tire coupling, if the torsional elastic deformation is too large, or under the action of centrifugal force, due to the shortening of the axial dimension, a large additional axial load will be generated on the two halves of the coupling, making the two shafts The bearing load increases, reducing the service life of the bearing. For example, some couplings are damaged because the relative displacement of the two shafts exceeds the allowable value, resulting in additional bending moments on the two bearings, and finally the stress exceeds the allowable value.