Analysis of Coupling And Off Axis Protection Device for Twin Screw Granulator

Coupling is an important connecting device between the main motor of the extruder and the gearbox. Currently, nylon rod couplings and safety couplings are commonly used on the market. Nylon rod couplings have a simple mechanical structure and low cost, but the torque is not accurate. They rely entirely on the shear force of the torque greater than that of the nylon rod. When the nylon rod is cut off, it needs to be reattached;

Nylon rod coupling

The safety coupling sets torque through friction force, which is more expensive than ordinary couplings. However, it can set a larger detachment torque, which is accurate and easy to reinstall after detachment.

safety coupling

During the production process of the extrusion granulator, if there is too much material or foreign objects in the cylinder, and the coupling does not detach, it may damage the screw core shaft; The safety coupling can set a larger off-axis torque to protect the screw core shaft, so it has been increasingly applied; When the torque of the safety coupling is too large and the shaft is disengaged, if the feeder is not notified in time to stop and continue to operate, it will cause blockage of the feed in the extruder. When restarting, cleaning the screw is time-consuming and laborious. Therefore, we have designed a safety coupling shaft disengagement detection and protection device. By detecting and calculating the current of the host and the speed of the gearbox input shaft, once the shaft is disengaged, the feeder will be stopped immediately to prevent blockage and waste of raw materials.

NANJING HAISI is professional manufacturer of Twin Screw Granulator, we supply Twin Screw Extruder, Single Screw Extruder, Plastic Recycling Extruder, Two Stage Extruder, Lab Scale Machinery, Mixing and Feeding Machine, Cooling and Pelletizing Machine, Crushing Machine and so on.