Air sealing construct design for electric main shaft of oil grease mill

Abstract

The invention relates to a design of an air seal structure of an electric spindle used for a grease film. The air with a certain pressure enters in an annular cavity between a baffle plate 3 and a front small cover 6 through an air passage 8 arranged on a front bearing seat 7 and then reaches an annular groove through a radial slant hole, a clearance is formed between the inner circle of the baffle plate and the outer circle of a front screw cap 2, a sawtooth-shaped groove is designed on the front screw cap and corresponds to the other annular groove of the baffle plate, the pressure air forms pressure air sealing rings in the clearance and the two grooves along with the rotation of the rotating axle at high speed, and the pressure air sealing rings are used for preventing the cooling fluid and the foreign impurities from entering in the rotating axle; an O-shaped sealing ring is sealed at the sealing point among the baffle plate, a dust cap and the front bearing seat for ensuring theair tightness of running of the pressure air in the air passage; and the sawtooth shape of the front screw cap can prevent a small amount of cutting solution from infiltrating, the small amount of the cutting solution can be thrown into the other annular groove of the baffle plate along with the rotation of the front screw cap, and then is discharged outside the electric spindle through the baffle plate and a guide groove or guide hole for the dust cap, so that the reliable air tightness is provided for the high-precision running of a bearing 9.

Description

technical field [0001] The invention belongs to the technical field of electric spindle sealing, and in particular relates to a method for designing an air-tight structure of an electric spindle for grease grinding. Background technique [0002] Figure 1-2 It is a conventional structure for sealing the front end of the grease electric spindle. The bearing 9 matched with the rotating shaft 1 is lubricated with grease. The seal is protected by the special-shaped structure of the O-ring 5, the front nut 2 and the front small cover 6. The electric spindle is grinding at high speed. During the process, a large amount of grinding wheel coolant will splash on the rotating shaft and the dust cover 4 at the front end of the electric spindle. Since the internal air pressure of the electric spindle will be smaller than the outside when the electric spindle rotates at a high speed, a pressure difference will be formed. When the cooling particles and metal powder are splashed onto the f...

AI Technical Summary

Problems solved by technology

In actual use, due to the above reasons, the bearing is far from reaching the designed service life, which greatly increases the maintenance cost of the electric spindle and the user's use cost, and greatly reduces the reliability of the electric spindle. Therefore, this sealing structure is no longer suitable for the high-speed grinding of the electric spindle. cut

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