What is a coupling?Let you understand the principle of coupling in one minute

   What is a coupling?

    Coupling refers to a device that connects two shafts or a shaft and a rotating part, and rotates together in the process of transmitting movement and power, and does not disengage under normal conditions.Sometimes used as a safety deviceprevent The connected parts bear excessive load, which plays a role of overload protection.

According to different working conditions, the coupling needs to have the following performance:

1. Removability.The mobility of the coupling refers to the ability to compensate for the relative displacement of the two rotating components.Factors such as manufacturing and installation errors between the connected components, temperature changes during operation and load deformation, etc., are all correct Portability is required.The movable performance compensates or relieves the additional load between shafts, bearings, couplings and other parts caused by the relative displacement between the rotating components.

2. Buffering.For occasions where the load is frequently started or the working load changes, the coupling must have elastic elements that can buffer and reduce vibration to protect the prime mover and the working machine.Little or no damage.

Coupling principle

  Now take the coaxial magnetic drive coupling as an example to illustrate its working principle.The magnetic drive coupling is composed of an outer magnet, an inner magnet and an isolation cover.Both the inner and outer magnets are magnetized in the radial direction and the magnetization direction is opposite The permanent magnets are composed of opposite permanent magnets. The permanent magnets are alternately arranged in the circumferential direction with different polarities and fixed on the low-carbon steel steel ring to form a magnetic disconnection conjoined body.The isolation cover is made of non-ferrite

(Thus it is non-magnetic) high-resistance material, generally austenitic stainless steel.In the static state, the N pole (S pole) of the outer magnet and the S pole (N pole) of the inner magnet Attracting each other and forming a straight line, the torque is zero at this time.When the outer magnet rotates under the drive of the power machine, the inner magnet is still in a static state due to the friction force and the resistance of the transmission part at the beginning. At this time, the outer magnet The body begins to deviate from the inner magnet by a certain angle. Due to this angle, the N pole (S pole) of the outer magnet has a pulling effect on the S pole (N pole) of the inner magnet, and the N pole (S pole) of the outer magnet ) Internal magnet The former N-pole (S-pole) has a pushing effect, so that the inner magnet has a tendency to follow the rotation. This is the working principle of the push-pull magnetic circuit of the magnetic coupling.When the N pole (S pole) of the outer magnet is just at the inner magnet When between the two poles (S pole and N pole) of the device, the push-pull force generated reaches the maximum, which drives the inner magnet to rotate.During the transmission process, the isolation cover separates the outer magnet from the inner magnet, and the magnetic field lines pass through the isolation cover to connect the outer magnet.

The power and movement of the magnet are transmitted to the inner magnet, thus realizing a non-contact sealed transmission