Introduction of stop bearing for twin screw extruder

The following is a detailed introduction to the twin-screw extruder stop bearing:

1. Working principle: The main function of the stop bearing is to withstand the axial thrust generated by the head pressure and protect the screw from damage. In twin-screw extruders, the pressure generated by the melt at the head of the screw is usually about 14MPA, and sometimes even up to more than 30MPA. This pressure forms a strong axial thrust on the screw, and the role of the stop bearing is to resist this thrust.

2. Type and characteristics: There are usually two types of double-screw extruder stop bearings: parallel double-screw extruder stop bearings and conical double-screw extruder stop bearings. Due to the center distance limitation, the parallel twin screw extruder usually uses a number of small diameter stop bearings in series, while the conical twin screw extruder uses a larger center distance and a larger thrust aligning ball bearing, which has the characteristics of large bearing capacity, low cost and convenient maintenance.

3. Design and manufacture: The design and manufacture of the stop bearing need to consider the load and axial size of the extruder to ensure the proper adjustment of the preload and bearing axial clearance. For example, the combined thrust bearing device with preload and high load capacity of the twin screw extruder in the same direction ensures the normal operation of the bearing through the preload mechanism and lubrication system.

4. Maintenance and replacement: The maintenance and replacement of the stop bearing is an important part of the daily maintenance of the twin screw extruder. Regular inspection and maintenance can extend the service life of bearings and reduce the failure rate of equipment. For example, the M4CT3068 tandem thrust cylindrical roller bearing is a bearing specially designed for twin-screw extruders, and its design and manufacture need to consider specific working conditions and load requirements.

In summary, the check bearing of the twin-screw extruder is a key part of the equipment, and its design and maintenance have a direct impact on the normal operation and efficiency of the equipment.