JP4358811B2 - Main shaft end seal structure of vertical machining center - Google Patents

Description

The present invention relates to a structure for sealing a tip end portion of a main shaft in a vertical machining center .

  For example, in a vertical machining center, a spindle end seal structure as shown in FIG. 3 is conventionally known. In this seal structure, a labyrinth 55 is formed by a seal member 52 on the main shaft 51 side and a seal member 54 on the main shaft head 53 side, and the end surfaces of the seal members 52 and 54 are covered by a lid member 56 via a slit 57, The labyrinth 55 and the lid member 56 are configured to prevent foreign matter such as cutting fluid and chips from entering, and to protect the spindle bearing 58 on the distal end side.

  However, according to the conventional seal structure, once the foreign matter enters the slit 57 or the labyrinth 55, it stays there and is not discharged to the outside. There was a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a spindle end seal structure in a vertical machining center that can discharge an invading foreign matter to the outside and exhibit an excellent sealing function for a long period of time.

In order to solve the above problems, the main shaft end seal structure according to the invention, fitted to the inner sealing member to the distal end outer periphery of the main shaft in a vertical machining center, in the circumferential tip portion of the spindle head for rotatably supporting the main shaft fitted outer side seal member, a labyrinth is formed between the seal member, with the end faces of the sealing member covering the lid member, providing a drain hole passing from the labyrinth to the outer sealing member to the distal end side of the spindle head On the other hand, the cover member is provided with a backflow prevention cover that projects outward from the outlet of the drain hole, and a number of small holes are formed in the cover to discharge the foreign matter from the drain hole. It is characterized by being discharged to the outside through the drain hole.

  According to the present invention, since the foreign matter that has entered the labyrinth is discharged from the drain hole to the outside using the rotation of the main shaft, an excellent sealing function can be exhibited for a long period of time. Further, since the cover for preventing the backflow is provided on the lid member, there is an effect that the backflow of the foreign matter can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show the seal structure of the tip of the main shaft of the vertical machining center. The spindle 1 is rotatably supported by a bearing 3 inside the spindle head 2. An inner seal member 4 is fitted on the outer periphery of the front end portion of the main shaft 1, and a pair of outer seal members 5, 5 ′ are fitted on the inner periphery of the front end portion of the main shaft head 2. A labyrinth 6 is formed between the two.

  A lid member 7 is attached to the outer seal member 5, and the end surfaces of the seal members 4, 5 are covered by the lid member 7 via the slits 8. A plurality of first drain holes 9 are provided on the outer periphery of the lid member 7, and a pair of second drain holes 10 are formed in the outer seal member 5 in an oblique shape. And it is comprised so that foreign materials, such as the cutting fluid and the chip which penetrate | invaded the slit 8 and the labyrinth 6, may be discharged | emitted from the drain holes 9 and 10 outside by rotation of the main axis | shaft 1. FIG.

  Two lids 11 for preventing backflow are fixed to the lid member 7 so as to protrude outward from the outlet of the second drain hole 10. A large number of small holes 12 (see FIG. 2) for discharging foreign matter from the second drain hole 10 are formed on the end surface and side surface of the cover 11. The outer seal member 5 is provided with a connection port 14 for the air purge pipe 13 that can be opened and closed by a plug 15, and an insertion hole 16 for the air purge pipe 13 is formed in the spindle head 2.

  The spindle head 2 is provided with a nozzle 17 that ejects cutting fluid toward the machining point and a passage 18 that supplies the cutting fluid to the nozzle 17. The outer seal member 5 of this embodiment also functions as a presser for the bearing 3.

  According to the main shaft end seal structure having the above configuration, the foreign matter that has entered the narrow gap 8 through the gap between the main shaft 1 and the lid member 7 is discharged to the outside through the first drain hole 9 by the rotation of the main shaft 1. The foreign matter that has entered the labyrinth 6 passes through the second drain hole 10 by the rotation of the main shaft 1 and is discharged to the outside from the small hole 12 of the cover 11.

  Therefore, foreign matter is less likely to stay in the labyrinth 6 or the slit 8, and there is no fear that the seal members 4, 5, 5 'are worn by the foreign matter, and an excellent sealing function can be exhibited for a long period of time. In addition, according to the configuration of this embodiment, as can be seen by comparing FIGS. 1 and 3, the existing main shaft end seal structure can be easily achieved by simply replacing the outer seal members 5, 5 ′ and the lid member 7. There is also an advantage that can be improved.

  When using a large volume of high-pressure cutting fluid, the plug 15 is removed, the air purge pipe 13 is connected to the connection port 14, and the labyrinth 6 is pressurized with high-pressure air. This makes it difficult for foreign matter to enter the labyrinth 6, and the foreign matter that has entered can be efficiently discharged to the outside through the second drain hole 10.

In addition, this invention is not limited to the said embodiment, It is also possible to implement by changing suitably the shape and structure of each part in the range which does not deviate from the meaning of this invention.

It is sectional drawing of the spindle end seal structure which shows one Embodiment of this invention. It is a front view of FIG. It is sectional drawing which shows the conventional spindle end seal structure.

Explanation of symbols

  1 ·· Main shaft 2 · · Main shaft head 3 · · Bearing 4 · · Inner seal member 5, 5 '· · Outer seal member 6 · · Labyrinth 7 · · Lid member 8 · · Slot 9 .. First drain hole, 10... Second drain hole, 11 .. Cover, 12 .. Small hole, 13 .. Air purge piping, 14.

Claims (1)

And fitting the inner seal member to the tip portion outer periphery of the main shaft in a vertical machining center, fitted outer side seal member to the peripheral tip of the spindle head for rotatably supporting the main shaft, forming a labyrinth between the seal members In addition, the end surface of each seal member is covered with a lid member, and a drain hole is provided in the outer seal member so as to pass from the labyrinth to the tip surface side of the spindle head . A vertical machining center that is provided with a cover, in which a number of small holes for discharging foreign matter from the drain hole are formed in the cover, and foreign matter that has entered the labyrinth is discharged to the outside through the drain hole by rotation of the spindle. Main shaft end seal structure.

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