The Function of Bearing Housings in a Double Roller Granulator

The bearing housings of a double roller press granualtors are the supporting bases of the main shaft of the pressure rollers. They bear the alternating loads throughout the extrusion process and primarily perform four core functions: positioning, load bearing, limiting, and installation. These functions directly determine the accuracy of the roller gap and the stability of the equipment. First, load bearing. The instantaneous extrusion during granulation generates enormous extrusive force. The material's reaction force is entirely transmitted to the bearing housings through the main shaft. The entire weight of the bearings and main shaft, as well as the extrusion impact load, are borne by the bearing housings, preventing the shaft from being suspended and deformed, and ensuring the roller skin adheres closely to the extrusion molding process. Second, precise positioning and limiting. A fixed bearing housing on one side locks the axial displacement of the main shaft, while a movable bearing housing on the other side slides laterally with a hydraulic cylinder to adjust the roller gap, ensuring that the two pressure rollers operate in parallel and do not shift. The installation datum of the bearing housings determines the coaxiality of the two rollers; positioning deviations will result in uneven roller surface contact and uneven particle thickness. Third, protecting the bearings and storing lubrication space. The bearing housing encloses the bearing and, with the help of oil seals and labyrinth seals, isolates it from dust, moisture, and fine fertilizer powder, preventing these particles from entering the bearing and causing ball bearing wear and seizing. The housing has pre-installed oil channels and grease fittings to hold lubricating grease, continuously supplying oil to the bearing for cooling. Fourth, the entire machine is fixed and vibration-damped. The bearing housing is secured to the machine frame base with anchor bolts, dispersing and transmitting the extrusion vibration to the frame, buffering the instantaneous impact of large hard objects entering the roller, and reducing overall machine vibration. Daily lack of lubrication, damaged seals, and loose anchor bolts can cause bearing overheating, housing bore wear, and uneven wear of the pressure roller, resulting in a significant decrease in forming rate. Proper maintenance of the bearing housing is key to extending the service life of the roller skin and bearings.

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