Patent Application
20170191566
Technical Field
The present invention relates to processing machines and more particularly to an aerosol-based bearing isolator for an attachment head of a machine tool.
Description of Related Art
Machine tools, such as lathes, milling machines, and drilling machines, are in wide use by contemporary factories to process work piece. Various machine tools operate in their respective processing modes. For example, lathes are dedicated to processing round work piece, milling machines to processing surfaces of work piece, and drilling machines to drilling holes in work piece.
A conventional attachment head always comprises a spindle and the spindle is mounted on the attachment head to clamp a processing tool for processing a workpiece. To minimize the effect of high heat generations by the processing point between the processing tool and work piece, the conventional machine tool always provides cutting fluid. The cutting fluid is sprayed onto a processing point between the processing tool and the workpiece to cool them. Because of high compressed of the cutting fluid, the cutting fluid is bounced back from the work piece; as a result, the attachment head is spattered with the cutting fluid inevitably. To prevent the cutting fluid from accumulating in the attachment head, a bearing isolator of the attachment head is equipped with a drainage mechanism for draining the cutting fluid from the attachment head. However, under specific processing conditions, the attachment head would be needed to tilt. For example, if an attachment head has rotating function on its spindle axis, the attachment head spindle can be rotated in multi-angle to process and thus the spindle is needed to change its angle more than 90 degrees in some cases of processing condition, which the spindle axis is over horizontal axis. Furthermore, when the spindle is not rotating, the cutting fluid is accumulated at below part of the bearing oil seal by gravity, after that the cutting fluid overflows the bearing isolators and intrude into the bearing of the spindle, thereby it damages the spindle of the attachment head.
Accordingly, it is imperative to overcome the aforesaid drawback of the prior art.
It is an objective of the present invention to provide an aerosol-based bearing isolator for an attachment head of a machine tool to prevent a cutting fluid from accumulating in an oil seal under any processing conditions.
In view of this, the present invention provides an aerosol-based bearing isolator for an attachment head of a machine tool. The aerosol-based bearing isolator comprises: a sealing element with having an axial hole centrally and having a compressed air path and a plurality of compressed air export channels, with the compressed air path disposed on an outer circumferential surface of the sealing element, and the compressed air export channels each having an end exposed from the compressed air path and thus being in communication with the compressed air path and an outside; and a compressed air guiding element having a compressed air import hole with an end exposed from an inner lateral surface of the compressed air guiding element to form an opening thereon, wherein the inner lateral surface of the compressed air guiding element abuts against the outer circumferential surface of the sealing element, thereby allowing the compressed air import hole to be in communication with the compressed air path.
In an embodiment, the compressed air path has its head and tail connected to each other and has a substantially V-shaped cross section.
In an embodiment, the compressed air export channels disposed on the sealing element are spaced apart equidistantly.
In an embodiment, the compressed air import hole of the compressed air guiding element is connected to an air compressor.
In an embodiment, the sealing element has an inner member and an outer member, wherein the compressed air path and the compressed air export channels are disposed on the outer member, wherein a gap is disposed between the inner member and the outer member, and the gap forms an annular opening on a lateral surface of the sealing element, wherein the compressed air export channels are in communication with the gap.
In an embodiment, a groove is disposed on the inner lateral surface of the compressed air guiding element and is in communication with the compressed air import hole and the compressed air path of the sealing element.
Therefore, given a compressed air compressed, a cutting fluid never accumulates in the sealing element under any processing conditions to disadvantageously compromise the operation of the sealing element.
To render the objectives, features and advantages of the present invention more comprehensible, the present invention is illustrated with diagrams and described hereunder.
Referring to
An axial hole 18 is centrally disposed at the sealing element 12. The sealing element 12 has an inner circumferential surface 20 which faces the axial hole 18. The sealing element 12 has an outer circumferential surface 22 which faces inner circumferential surface 38 of compressed air guiding element 14. The sealing element 12 further has two lateral surfaces 24, each of which adjoins the inner circumferential surface 20 and the outer circumferential surface 22. The sealing element 12 essentially comprises an inner member 26 and an outer member 28 as shown in
Referring to
Referring to
Referring to
Hence, the fact that the attachment head spindle capable of multi-angle processing can rotate and thus change its processing angle by more than 90 degrees, coupled with the air compressor's providing compressed air to a sealing element continuously, prevents a cutting fluid from reaching the sealing element to disadvantageously compromise the operation of the attachment head spindle capable of multi-angle processing.
