US-12617053-B2 - Mist collector and machine tool

US12617053B2US 12617053 B2US12617053 B2US 12617053B2US-12617053-B2

Abstract

A mist collector includes: a filter that collects mist; a nozzle including an ejection port capable of ejecting a coolant, the nozzle being disposed to cause the ejection port to be opposite to the filter; and a motor that causes the filter to move, to cause a position on the filter to which the ejection port is opposite to change.

Inventors

Kosuke Yamamoto
Kenjiro IGA
Masahiro Kosuge

Assignees

DMG MORI CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20200827

Claims (7)

1 . A mist collector comprising: a filter that collects mist; a nozzle including a first ejection port capable of ejecting a fluid, the nozzle being disposed to cause the first ejection port to be facing the filter; and a drive portion that causes at least one of the filter and the nozzle to move, to cause a position on the filter to which the first ejection port is opposite to change, wherein the drive portion drives at least one of the filter and the nozzle to: cause a relative speed of the relative movement between the filter and the nozzle to be a first speed, when mist is collected by the filter; and cause the relative speed of the relative movement between the filter and the nozzle to be a second speed that is slower than the first speed, when fluid is ejected from the first ejection port toward the filter.
2 . The mist collector according to claim 1 , wherein the nozzle is fixed, and the drive portion causes the filter to move.
3 . The mist collector according to claim 1 , wherein the filter has a disk shape centered on a predetermined axis, and includes a filter surface orthogonal to the predetermined axis, and the drive portion causes the filter to rotate about the predetermined axis.
4 . The mist collector according to claim 3 , further comprising a fan that generates an airflow passing through the filter, wherein the drive portion causes the fan to rotate while the drive portion causes the filter to rotate.
5 . The mist collector according to claim 1 , wherein an airflow passes through the filter in a flow direction, and the nozzle is disposed on a downstream side of the filter in the flow direction.
6 . A machine tool comprising: a cover body that defines a machining area; and the mist collector according to claim 1 that is connected to the cover body and into which mist generated in the machining area is guided.
7 . A mist collector comprising: a filter that collects mist; a nozzle including a first ejection port capable of ejecting a fluid, the nozzle being disposed to cause the first ejection port to be facing the filter; and a drive portion that causes at least one of the filter and the nozzle to move, to cause a position on the filter to which the first ejection port is opposite to change, wherein the nozzle includes a second ejection port, and the first and second ejection ports arranged along a radial direction of the predetermined axis.

Description

TECHNICAL FIELD The present invention relates to a mist collector and a machine tool. BACKGROUND ART For example, Japanese Utility Model Laying-Open No. H6-36742 (PTL 1) discloses a mist scattering prevention device for a machine tool. The device includes an overall cover provided with an opening portion, an automatic opening and closing cover disposed in the opening portion, a plurality of discharge ports and a plurality of suction ports provided on two respective opposite sides of the opening portion, and a mist collection device connected to the suction ports via a duct. When the automatic opening and closing cover is opened, an air curtain is formed by providing airflows from the discharge ports toward the suction ports. CITATION LIST Patent Literature PTL 1: Japanese Utility Model Laying-Open No. H6-36742 SUMMARY OF INVENTION Technical Problem As disclosed in PTL 1 described above, a mist collector is known which is used for collecting mist generated in a machining area. When a workpiece is machined using a coolant in a machine tool, the coolant heated by heat generated along with the machining becomes a mist form (mist). Discharge of such oil mist to the outside of the machine tool leads to a cause of contaminating the inside of a factory. The mist collector is thus installed in the machine tool. The mist collector is provided with a filter for collecting the oil mist. However, it is assumed that the mist collector receives, in addition to the oil mist, fine chips and the like that are generated along with workpiece machining and that then flow into the mist collector. The fine chips and the like may thus cause clogging of the filter. This may impair efficient collection of the oil mist. It is therefore an object of the present invention to solve the above problem, and particularly, to provide a mist collector that can prevent clogging of a filter, and a machine tool that includes such a mist collector. Solution to Problem A mist collector according to the present invention includes: a filter that collects mist; a nozzle including an ejection port capable of ejecting a fluid, the nozzle being disposed to cause the ejection port to be opposite to the filter; and a drive portion that causes at least one of the filter and the nozzle to move, to cause a position on the filter to which the ejection port is opposite to change. According to the mist collector configured as described above, the fluid is ejected from the ejection port toward the filter while the position on the filter to which the ejection port is opposite is caused to change by causing at least one of the filter and the nozzle to move by the drive portion. This can clean the filter and prevent clogging of the filter. Preferably, the nozzle is fixed. The drive portion causes the filter to move. According to the mist collector configured as described above, it is possible to prevent clogging of the filter with a simple configuration by configuring the nozzle to be a fixed type. Preferably, the filter has a disk shape centered on a predetermined axis, and includes a filter surface orthogonal to the predetermined axis. The drive portion causes the filter to rotate about the predetermined axis. The nozzle is disposed to cause the ejection port to be opposite to the filter surface. According to the mist collector configured as described above, it is possible to reduce the mist passing through the filter by causing the filter to rotate, when the mist is collected by the filter. This allows the mist to be efficiently collected by the filter. It is also possible to change the position on the filter to which the ejection port is opposite by causing the filter to rotate, when the fluid is ejected from the ejection port toward the filter surface. This allows the filter to be efficiently cleaned. Preferably, the nozzle includes a plurality of the ejection ports arranged along a radial direction of the predetermined axis. According to the mist collector configured as described above, it is possible to eject the fluid toward a wider area of the filter surface, along with the rotation of the filter. Preferably, the mist collector further includes a fan that generates an airflow passing through the filter. The drive portion causes the fan to rotate while the drive portion causes the filter to rotate. According to the mist collector configured as described above, it is possible to make the configuration of the mist collector simple by sharing the drive portion for the rotation of the filter and for the rotation of the fan. Preferably, the drive portion drives at least one of the filter and the nozzle to cause a relative speed between the filter and the nozzle to be a first speed, when the mist is collected by the filter, and to cause the relative speed between the filter and the nozzle to be a second speed that is slower than the first speed, when the fluid is ejected from the ejection port toward the filter. According to the mist collector configured as descr