How to choose coupling and connection?

Couplings have a wide range of uses, and they can be usefully used in many occupations.Its primary use is to connect equipment and motors. What is its selection method? If we are interested in this, let's take a look at which ones.

Coupling selection method and connection

Selection method of coupling:

① Allowable additional torque-is the allowable value of torque accepted when the coupling is actually used.

②Allowable torque-is the critical value of coupling damage during use.

③Allowable speed-It is necessary to determine that the speed of the motor is within this range when selecting the model.

④ Allowable migraine-the allowable value of the axis parallel error of the two shafts.

⑤ Allowable deflection angle-the allowable value of the mutual viewpoint formed between two axes.

⑥ Allowable axial error-the allowable value of the displacement for the axial movement of the two axes.

When starting, stopping, and switching between forward rotations, the electrical timing applies a load greater than the torque of the motor to the coupling. Therefore, when selecting the coupling, the additional torque of the coupling should be greater than the torque of the motor.

Coupling is a mechanical part used to connect two shafts (driving shaft and driven shaft) in different tissues so that they can rotate together to transmit torque.In high-speed and heavy-duty power transmission, some couplings have the effects of buffering, damping and improving the dynamic functions of the shafting.The coupling is composed of two halves, which are separately connected with the driving shaft and the driven shaft.The general power machine is mostly connected with the working machine by means of a coupling.Therefore, sometimes in the process of equipment coupling, we must pay attention to the errors that appear in the process of shaft and shaft coupling.The coupling is composed of two halves, which are separately connected with the driving shaft and the driven shaft.The general power machine is mostly connected with the working machine by means of a coupling.Therefore, sometimes in the process of equipment coupling, we must also pay attention to the errors that appear in the process of connecting the shaft to the shaft. It has a beautiful appearance and good corrosion resistance. It does not need to go through the appearance of plating and other surface treatments, but to play the inherent appearance function. A kind of steel in many aspects, it is generally called stainless steel.High alloy steels such as 13 chromium steel and 18-chromium nickel steel represent functions.Analyzed from the metallographic point of view, because stainless steel contains chromium, a very thin chromium film is formed on the surface. This film is separated from the oxygen intruding into the steel and has a corrosion resistance effect.

In order to comply with the basic general specifications of the coupling, the chain coupling uses a common chain, which meshes with two side-by-side sprockets with the same number of teeth. The main difference between chain couplings of different structure types is the choice of different chains. The common ones are double rows. Roller chain couplings, single-row roller chain couplings, toothed chain couplings, nylon chain couplings, etc.The chain coupling has a simple structure (composed of four pieces), convenient assembly and disassembly, no need to move the connected two shafts when disassembling, compact size, light weight, certain compensation capabilities, low requirements for equipment accuracy, reliable operation, It has a long life and low cost. It is widely used in various important structural parts in quenching and tempering treatment, especially those connecting rods, bolts, gears and shafts that operate under alternating loads.The rectangular spline is characterized by high centering accuracy and good centering stability.Regarding the taper hole is related to the general shaft to facilitate the disassembly of the equipment, the key link is safe and reliable. The coupling is a mechanical part used to connect the two shafts (the driving shaft and the driven shaft) in different organizations to rotate together to transmit torque.In high-speed and heavy-duty power transmission, some couplings have the effects of buffering, damping and improving the dynamic functions of the shafting.

Working principle of coupling

The working principle of the coupling: the rotation of the prime mover drives the swing arm to rotate, and it is thrown out under the effect of centrifugal force. As the motor speed increases, the positive pressure of the three centrifugal conflict blocks on the swing arm on the conflict wheel is also increasing. Large, the conflict torque gradually increases and drives the load to move

The working principle of the coupling: the rotation of the prime mover drives the swing arm to rotate, and it is thrown out under the effect of centrifugal force. As the motor speed increases, the positive pressure of the three centrifugal conflict blocks on the swing arm on the conflict wheel is also increasing. Large, the conflict torque gradually increases and drives the load to work. Under severe overload or locked-rotor conditions, the load end torque is greater than the conflict torque, and the centrifugal force suffered by the centrifugal conflict block decreases, resulting in a reduction in the force of the slider, and the coupling Play the effect of overload maintenance. When the equipment load suddenly increases or decreases, the conflict block and the conflict wheel produce intermittent relative movement, which constitutes an alternating impact load, which repeatedly impacts the output sleeve of the coupling and the input of the reducer The joint surface of the shaft cooperation is like a heavy hammer hitting the joint surface countless times, and then the joint surface and the key pin are damaged. To effectively improve the operating conditions of the equipment, the joint equipment of the electromechanical equipment must be modified.

Coupling is an important component of electromechanical equipment. Improper selection will affect the operating conditions of the equipment, and even cause equipment failure. The selection of the coupling must be based on the operating function of the equipment (power, speed, impact, oscillation, Load changes, drag system requirements), operating environment (ambient temperature, environmental humidity) and many other factors, according to scientific, reasonable, applicable, and economical criteria, select the applicable site coupling, and then lay an outstanding foundation for the equipment and operation The coupling will not show the phenomenon of output shaft sleeve keyway flatness and key damage, the equipment runs without noise, no vibration, no impact, all operating targets are normal, and the equipment failure rate is significantly reduced. And the large torque value of the coupling is low Due to the overturning torque of the motor, the motor can be protected from overload. If an overload occurs or even "stuck", it can be unloaded by itself, and then the motor and transmission organization can be maintained.

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