Universal shaft is also called universal coupling. Universal coupling A mechanical part used to connect two shafts (drive and driven) in different mechanisms to rotate together to transmit torque. Coupling industry as an important part of China's general machinery industry, its products as the basic parts of major technical equipment, widely used in metallurgy, mining, lifting, construction machinery, automobile, paper making, textile, nonferrous metals, shipbuilding and other industries.

I. Classification of main products in the universal shaft industry:

There are many structural types of universal coupling, such as: cross shaft type, ball cage type, ball fork type, convex block type, ball pin type, ball hinge type, ball hinge plunger type, three pin type, three fork type, ball pin type, hinge rod type, etc. The most commonly used is the cross shaft type, followed by the ball cage dragon, in practical application according to the size of the transfer of torque is divided into heavy, medium, light and small.

II. Principle and characteristics of cardan axis:

The universal coupling makes use of the characteristics of its mechanism, so that the two axes are not the same axis, the existence of the axis Angle can realize the continuous rotation of the two axes connected, and reliable transmission of torque and movement. Universal coupling is the biggest characteristics: its structure has a large angular compensation capacity, compact structure, high transmission efficiency. The Angle between two axes of universal coupling with different structure types is different, generally between 5° and 45°. The cardan shaft is a mechanical part used to connect two shafts (driving shaft and driven shaft) in different mechanisms and make them rotate together to transfer torque. In the high speed and heavy load power transmission, some couplings also have the function of buffering, damping and improving the dynamic performance of shafting. The coupling consists of two halves connected with the drive shaft and the driven shaft respectively. The general power machine is connected with the working machine by means of a coupling.

III. Elements in the operation of the cardan shaft:

1. Before the official start of the device, the two sides need to be cleaned, and then the key ports on both sides of the universal shaft need to be matched, and then tighten the screws, and then do not slide loose and other conditions.

2. When the universal shaft is in operation, it is easy to cause problems with people and devices, so each place needs to use more suitable protection means.

3. After assembly, after operating as usual for a circle, it is necessary to check whether there is a screw. If the situation occurs, it needs to be tightened twice, so that the universal shaft will not be loose.

4. When operating, we should carefully pay attention to whether there is any strange situation in the universal shaft device, such as getting hot and shaking. If this situation occurs, it needs to be repaired as soon as possible.

Causes of common failures

Fault 1: Unbalance of drive shaft

The main reason is that the drive shaft sag or bending phenomenon due to collision.

Fault two: the drive shaft is loose

The main reason is that there is no maintenance operation in accordance with the requirements of the provisions, so that the wear of the drive shaft is aggravated, and then the phenomenon of loose.

Fault 3: Cross shaft is damaged

Drive shaft in the process of operation, if the load is too large, coupled with the generated centrifugal force, will make the cross shaft broken or damaged