Sealing structure design for electric main shaft of oil fog mill

Abstract

A leakproof structure design of an electric main shaft used for an oil mist mill is that a part at front end of the electric main shaft is divided into a revolving part and a motionless part. The revolving part comprises a rotating shaft 1 and a front screw cap 2; the motionless part comprises a front small cover 3, a dust cover 4, a front bearing block 6 and a newly designed baffle 8. Small clearance fit is adopted between the revolving part and the motionless part, with the radial clearance being between 0.4 and 0.6mm and the axial clearance being between 0.5 and 1mm. The axial length of the front screw cap is lengthened and a water splash groove and a labyrinth seal structure are designed along the axial length. A convex groove of the structure is used for mechanically sealing the front small cover, while another lengthened convex groove thereof is used for tightly fixing an inner ring of a bearing 7. The baffle is arranged on the water splash groove and half the width of the baffle can be blocked in the water splash groove but does not revolve with the front screw cap; a water splash recessed groove is designed at the lower end of the half width; and another half width of the baffle closely leans against the head face of the front small cover. The dust cover and the front bearing block adopt an O-shaped sealing ring 5 for sealing. With a drain hole being arranged at the lower end, the sealing ring has good sealing effect and long service life.

Description

Technical field [0001] The invention belongs to the technical field of electric spindle sealing, and particularly relates to a sealing structure design of an electric spindle for oil mist milling. Background technique [0002] The oil mist electric spindle needs to be equipped with an oil mist generator and connected to the electric spindle. The oil mist generator generates a clean pressure oil mist airflow of about 0.3Mpa to enter the bearing part of the electric spindle for lubrication. See the conventional sealing structure of the oil mist electric spindle Figure 1-3 . [0003] When the electric spindle is running normally, the oil mist is continuously supplied to the bearing at a certain pressure, and most of the generated pressure exhaust gas is discharged from the gap between the front small cover and the front nut. The leakage of the exhaust gas also prevents the external generation during the grinding process. Falling abrasive particles, metal powder and cutting fluid at...

AI Technical Summary

Problems solved by technology

However, in order to improve efficiency in actual production, the splash pressure of the electric spindle cutting fluid is greater than the exhaust gas pressure, and the conventional sealing structure still cannot meet the ideal requirements, so a more effective protective structure needs to be considered

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