The plum blossom elastic coupling has a simple structure, a small number of parts, a small radial dimension, and no need for lubrication; the elastic element has a high pressure bearing capacity.Except for the double-flange plum blossom elastic coupling, the half coupling must be moved axially when replacing the vulnerable plum blossom elastic parts.This kind of coupling has a certain ability to compensate the relative deviation of the two shafts.
The cross-section of the plum petals of the plum elastic coupling is usually circular, which can improve the uniformity of the load distribution on the working surface, and can transmit a larger torque, but the elasticity is slightly reduced.It can also be made into a rectangle or fan shape.When the coupling is working, the plum petals are squeezed, and only half of the plum petals carry work.
Plum-shaped elastic parts are generally made of polyester polyurethane (hardness code a), or cast nylon (hardness code b), the former has a lower bearing capacity than the latter.The semi-coupling and flange connection materials are 45 steel or ZG70-500. In the chemical industry, for anti-corrosion purposes, this phenolic resin is often used to make semi-couplings.
The plum blossom elastic coupling has torsional elasticity, shock absorption, maintenance-free, compact design and low inertia.
1. The plum blossom elastic coupling can transmit torque and rotation angle, and absorb the safety deviation of the shaft. When the installation deviation exceeds the allowable value, it may cause vibration or shorten the life of the coupling. Therefore, ensure that the deviation is adjusted properly.
2. Deviations do not only occur in equipment assembly. Vibration, thermal expansion, bearing wear, etc. during the working process can cause deviations.Therefore, it is recommended to adjust the axial deviation to less than 1/3 of the maximum value.
3. There are three kinds of shaft deviation, namely radial deviation, angular deviation and axial deviation.Please adjust the deviation so that it is lower than the allowable value listed in the specification table of each product.
4. The maximum deviation tolerance listed in each product refers to the case where only one deviation exists. When two or more deviations exist at the same time, the allowable value should be less than 1/2 of the maximum deviation in each specification table.
The diaphragm coupling can withstand various deviations, and is most suitable for correcting deflection and axial deviation, but its ability to deal with eccentricity is relatively poor, because the spiral groove must be bent in two different directions at the same time, which will cause great Internal pressure, leading to premature damage to the coupling.Although the long spiral groove coupling can easily bend under various deviations, it has the same effect on the rigidity of the coupling under the torsional load.Excessive swing clearance under torsional load will affect the accuracy of the coupling and weaken its overall performance.Spiral groove type application place: Because of its poor processing ability, it is most suitable for low torque applications, especially in connection with encoders and other lighter instruments.Parallel groove type: Parallel groove type elastic coupling usually has 3 to 5 grooves to cope with the problem of low torque rigidity.Parallel grooves take into account that the cut grooves can be shortened without reducing the ability to withstand deviations. The short cut grooves can increase the torque rigidity of the coupling and overlap, so that it can withstand considerable torque.Parallel groove application: This performance makes it suitable for light-load applications.
The semi-coupling of the diaphragm coupling is connected to the coupling through the diaphragm. The diaphragm is embedded in the hole between the semi-coupling and the outer sleeve to transmit torque and bear radial force, which can compensate the speed of the reducer. The angular displacement between the output shaft and the axis of the reel is similar to the elastic pin gear coupling.
Use and maintenance of diaphragm coupling:
1. Before installing the diaphragm coupling, clean the end faces of the two shafts and check the fit of the key grooves on the end faces of the diaphragm coupling;
2. After the diaphragm coupling is installed, all screws must be checked. If they are found to be loose, they must be tightened. Repeat this for several shifts to ensure that they will not loosen;
3. When the diaphragm coupling is in operation, check whether the diaphragm coupling is abnormal. If any abnormality occurs, it must be repaired;
4. Diaphragm couplings must take appropriate safety precautions at various locations where personal and equipment accidents may be caused by the operating diaphragm couplings;
5. In order to prevent the fretting wear of the diaphragm at high-speed operation, causing the diaphragm bolt hole to crack and damage, the diaphragm coupling can be coated with a solid lubricant such as molybdenum disulfide or the diaphragm The surface is treated with anti-friction coating; high-speed diaphragm coupling;
6. The diaphragm coupling should avoid long-term overloading and operation accidents.