What Industries Are Magnetic Powder Clutches Commonly Used In?

The magnetic particle clutch is based on the electromagnetic principle and the use of magnetic powder to transmit torque, with the excitation current and the transmission torque is basically a linear relationship, in the case of irrelevance to the slip difference, it can transmit a certain torque, with fast response, simple structure, no pollution, no noise, no impact vibration energy saving and other advantages, is a multi-purpose, superior performance of the automatic control element.

Magnetic powder clutches are classified according to shaft type: dual-shaft magnetic particle clutch, inner shell rotary hollow shaft magnetic particle clutch and shell rotary hollow shaft magnetic particle clutch.

Due to the above characteristics, magnetic particle clutches and brakes have been widely used in papermaking, printing, plastics, rubber, textile, printing and dyeing, wire and cable, metallurgy and other related coiling processing industries in unwinding and winding tension control. In addition, the magnetic particle clutch can also be used for buffer starting, overload protection, speed regulation, etc. Magnetic particle clutch is commonly used in industries such as paperwork machinery, bag-making machinery, papermaking machinery, etc., so the requirements for the clutch for the use of such products are relatively high, because as an overloader, it can be used in mining hoisting machinery and other equipment, which can make the prime mover start without load, gradually load, and improve the load capacity of the equipment;

What are the working methods of magnetic particle clutches:
The working mode of magnetic particle clutch can be divided into: energized combination and power-off combination. The magnetic particle clutch controls the engagement and disengagement of the clutch by the power on and off of the coil. Magnetic particle clutch can be divided into: dry single-plate magnetic clutch, dry multi-plate magnetic clutch, wet multi-plate magnetic clutch, magnetic particle clutch, differential magnetic clutch, etc. Among them, the dry single-piece magnetic particle clutch: when the coil is energized, the magnetic attraction "armature" plate is generated, and the clutch is in the engaged state; When the coil is de-energized, the "armature" springs back and the clutch is in a disengaged state. Because there is no mechanical connection between the main and driven parts, there is no wear and tear, no magnetic particle leakage, no impact, and the speed can be changed by adjusting the excitation current, and it is used as a continuously variable transmission. The main disadvantage of a differential magnetic particle clutch is that the eddy currents in the rotor generate heat, which is proportional to the speed difference. The efficiency is very low when running at low speed, and the efficiency value is the main speed ratio of the driven shaft, that is, η=n2/n1.

Advantages of dual-shaft magnetic particle clutch:
1. High efficiency: Because the dual-shaft magnetic particle clutch uses a magnetic field to transmit power, it has a very high energy efficiency, and it can convert power more efficiently than the traditional mechanical clutch at the same power.
2. Good stability: The torque adjustability of the dual-shaft magnetic particle clutch is very good, and it can be adjusted according to different use needs, which can make its working state more stable, so as to better ensure the safety and stability of the work.
3. Low noise: The traditional mechanical clutch increment has a fixed friction loss, so it is easy to produce noise when in use, while the dual-shaft magnetic particle clutch uses a magnetic field to transmit force, which will not produce similar noise, which can make the working environment quieter.
4. Lightweight and easy to use: Due to the use of magnetic transmission, the dual-shaft magnetic particle clutch is smaller in size and lighter in weight than the traditional mechanical clutch, which can reduce the pressure of manual operation and is also convenient for handling and installation.

Precautions for the installation and use of dual-shaft magnetic particle clutch:
1. Before installation, carefully check whether the various parts of the dual-shaft magnetic particle clutch are in good condition, whether there are defects or deformations, and if there is a problem, it should be dealt with or replaced in time.
2. During installation, it is necessary to ensure that the bearing end face of the biaxial magnetic particle clutch should be perpendicular to the direction of rotation of the shaft, and maintain the consistency of the axis during installation.
3. The magnetic particle clutch should be fixed in the mechanical structure to ensure that its position is stable and not easy to move or shake.
4. During operation, to ensure good lubrication of the clutch, you can choose to use special grease or oil to ensure the normal operation of the machinery.
5. In order to ensure the safe operation of the dual-shaft magnetic particle clutch, it needs to be fully tested and adjusted before operation to ensure that its working parameters meet the requirements and are reliably connected to the mechanical system.
6. Dual-shaft magnetic particle clutches should be checked regularly during use, especially some parts and seals that are easy to wear, to determine whether they need to be replaced or maintained.

Advantages of hollow shaft magnetic particle clutch:
When the excitation current of the hollow shaft magnetic powder clutch remains unchanged, the hollow shaft magnetic powder clutch can stably convey a constant torque, and the torque conveyed is not affected by the differential slip speed between the transmission and the follower, that is, there is no difference between the static torque and the dynamic torque, and if the characteristics are applied to tension control, the user only needs to adjust the size of the excitation current, and the required torque can be accurately controlled and communicated, so as to achieve the purpose of controlling the coil tension simply and effectively.

Precautions for the installation and use of hollow shaft magnetic particle clutch:
1. Before the formal operation or after the device is moved, in order to produce smooth torque, it can be operated as evenly as possible: in the state of no excitation, the driving side should rotate at a high speed (below 1800rpm) for about 1 minute, and the excitation current should be set at 1/4-1/5 of the rated rate, on the one hand, the driving side should be rotated, and on the other hand, it would be opened in 5 seconds, turned off in 10 seconds, and excitation about 20 times.
2. When using bolts to fix the shaft end inserted into the magnetic particle clutch of the hollow shaft, in order to avoid the bearing inside the magnetic particle clutch from being subjected to abnormal load, please reserve a certain axial clearance on the elastic coupling.
3. When the pulley is driven, in order to avoid the bearing inside the magnetic particle clutch from receiving additional load, the load must be controlled within the allowable range.
4. Try to use an elastic coupling to connect the input side and the shaft, and the concentricity and straight angle of each shaft must be controlled within the allowable range of the elastic coupling used.
5. In order to avoid the braking of the heat dissipation stator and not to cause additional impact (i.e., load) on the bearing inside the magnetic powder clutch of the hollow shaft, try to set up the side holes and clearances of the cage as far as possible, and do not tighten them in the axial direction.

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