A medium-speed grinding spindle air seal device

Abstract

The invention discloses a spindle air-sealing device of a medium-speed mill. The spindle air-sealing device is characterized by comprising a shell, wherein a spindle is arranged at the center part of the bottom surface of the shell; the lower end of the spindle partially penetrates out of the bottom surface of the shell; a mill plate is fixed at the top end of the spindle; a circular ring is fixed on the lower end face of the mill plate; the outer side of the spindle inside the shell is sleeved with a jacket; the bottom end of the jacket is fixed on the bottom surface of the shell; the top end of the jacket does not contact the lower end face of the mill plate; a fixed ring is fixed at the lower end of the jacket. The spindle air-sealing device is simple in structure, a high-elasticity foam sealing ring is compressed to deform in installation, and elastically compensates a sealing body of an outer sealing ring all the time, so that cold air in a cavity defined by the spindle and jacket does not leak outside; the outer sealing ring plays dual sealing effects after an inner sealing ring is damaged. The service life of the overall spindle air-sealing device is prolonged, and safe and efficient operation of equipment is ensured.

Description

technical field [0001] The invention relates to the technical field of shaft sealing, in particular to an air sealing device for a medium-speed grinding main shaft. Background technique [0002] The medium-speed roller disc coal mill is a kind of equipment used to make coal powder. It drives the grinding disc to rotate through the vertical rotating shaft with a diameter of about 2m, and the grinding disc drives the rotatable grinding roller. The grinding disc and the grinding roller move relatively, and the grinding The coal is pulverized, and the pulverized coal is taken away by the 300°C high-temperature hot air blown from bottom to top, thus completing the pulverization process. In the production process, in order to prevent hot air from entraining pulverized coal from leaking from the main shaft, two sealing methods are adopted. 1. Carbon fiber high-temperature packing seal, but this kind of material is inelastic, and the large-diameter vertical rotating shaft is ec...

AI Technical Summary

Problems solved by technology

1. Carbon fiber high-temperature packing seal, but this kind of material is inelastic, and the large-diameter vertical rotating shaft is eccentric, and hot air and a large amount of coal powder are often blown out; 2. Medium-speed mill base seal (ZL 2010 20160274.4) improved Although the sealing device effectively solves the problem of powder leakage and air leakage, due to the high internal temperature, the grinding disc swings left and right, the gap between the inner seal and the grinding disc increases, and coal powder leaks into the outer seal, causing wear between the outer seal and the shaft, which not only destroys the outer seal, but also Worn spindle produces leaks

Images