Axial seal of electric spindle

Abstract

The invention provides an axial seal of an electric spindle. The axial seal of the electric spindle is characterized in that a bearing at the front end of a rotor shaft is axially limited by a front cover, a sealing part is installed between the front cover and the bearing, and a combined sealing nut is screwed at the front shaft end of the rotating shaft; and a gap is reserved between the outer wall of the combined sealing nut and the inner wall of the front cover, the inner threads of the combined sealing nut are connected to the rotor shaft in a matched mode, outer threads are arranged on the outer wall of the combined sealing nut, and the outer threads are opposite to the rotating direction of the electric spindle. On the basis of sealing back blades in the prior art, the back spiral with the sealing effect is designed, the spiral structure can effectively transfer a small amount of cooling liquid which cannot be blocked by the dynamic seal of part of the back blades to the suctioninlets of the back blades through the back spiral structure, so that more effective sealing is achieved, and long-term effective operation of the spindle is ensured.

Description

technical field [0001] The invention relates to the field of precision machine tools, in particular to an axial seal of an electric spindle. Background technique [0002] The electric spindle used in CNC machining centers and other equipment is a highly integrated mechatronics system. The electric spindle unit is the core component of the machine tool equipment. Its technical requirements are very strict and the equipment has high precision. The optimization of the seal design of the spindle can significantly improve the durability of the electric spindle. While the spindle of the machine tool drives the tool to cut the workpiece, some equipment must start the cutting fluid flushing, cooling the tool and the workpiece. In a relatively sealed environment, cutting fluid splashes, metal shavings or metal dust, etc., may easily cause cutting fluid or other impurities to enter the internal system of the spindle. [0003] At present, most of the seal designs mainly adopt the for...

AI Technical Summary

Problems solved by technology

In a relatively sealed environment, cutting fluid splashes, metal shavings or metal dust, etc., may easily cause cutting fluid or other impurities to enter the internal system of the spindle

[0003] At present, most of the seal designs mainly adopt the form of planar and axial labyrinth seals. The disadvantages of this scheme are mainly that when a large amount of cutting fluid is flushed, the labyrinth seal cannot achieve effective isolation, and the entering coolant cannot be self-discharged. Over time, the cutting fluid will enter the bearing chamber. , resulting in failure of machine tool spindle bearings, equipment maintenance

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