The scope of application and load capacity of plum coupling

The scope of application and performance characteristics of plum coupling

1、梅花联轴器主要适用于起动频繁、正反转、中、中等扭矩和要求高性的工作场合，例如：冶金、矿山、石油、化工、起重、运输、轻工、纺织、水泵、风机等。工作环境温度-35℃～+80℃，传递公称扭矩25～12500Nm，许用转速1500～15300r/min。

2. Compared with other couplings, plum couplings have the following characteristics:

(1) The structure is simple, the radial dimension is small, the weight is light, and the moment of inertia is small, which is suitable for medium occasions.

(2) It has large axial, radial and angular compensation capabilities.

(3) Polyurethane elastic elements are resistant to wear and oil, with large bearing capacity, good service life and stability.

(4) The coupling does not need lubrication, the maintenance workload is small, and it can run continuously for a long time.

(5) Stable work, with good damping, buffering and electrical insulation properties.

3. The plum blossom coupling is mainly composed of two protruding teeth that are closely meshed and subjected to radial compression to transmit torque. When the two axes are relatively offset, the elastic element undergoes corresponding elastic deformation, which plays a role of automatic compensation.

The bearing capacity of plum coupling is an important manifestation:

(1) The cross section of the plum petals of the plum blossom coupling is usually circular, which can improve the uniformity of the load distribution on the working surface, and can transmit large 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.

(2) The plum blossom coupling has two structural forms: casting material and steel material.Steel materials are more suitable for high-load drive units, such as rolling mills, elevators, and spline bushings.Torque range: 5Nm--35000Nm.

(3) 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, this phenolic resin is often used to make semi-couplings.

(4) The plum blossom coupling has torsional elasticity, shock absorption, maintenance-free, compact design and low inertia.

(5) The structure of the plum blossom coupling is simple, the number of parts is small, the radial dimension is small, and there is no need for lubrication; the elastic element has a relatively good bearing capacity under pressure.Except for the double-flange plum coupling, when replacing the vulnerable plum-shaped elastic parts, the half coupling must be moved axially.This kind of coupling has the corresponding compensation ability for the relative deviation of the two shafts.

Due to its small radial size and moment of inertia, no gap, good vibration reduction, cushioning effect, and axial, radial and angular compensation, plum-shaped elastic couplings are widely used in metallurgy, petroleum, chemical industry, and cranes. And other industries, especially the middle working conditions with frequent starting and forward and reverse rotation.Although the plum blossom flexible coupling has good misalignment compensation capabilities, the misalignment of the coupling still produces additional force and torque on the rotor and bearing system, and these additional forces often bring serious consequences.

The quincunx elastic coupling transmits torque mainly through the engagement of the convex teeth of the two halves of the coupling and the quincunx-shaped elastic body.There is no gap between the protruding teeth and the elastic body. When the axes of the two rotors are relatively offset, the elastic element will deform correspondingly, which plays a role of automatic compensation.

As the coupling is rotating, the relative offset direction and offset 5 will periodically change for each elastic body, which is not convenient for mechanical analysis. The author took the relative offset along the elastic body and the rotation line. The direction, along the elastomer.