Rotary atomizing head type coating machine

Patent metadata

Field	Value
Publication number	US-10399096-B2
Application number	US-201615318569-A
Country	US
Kind code	B2
Filing date	Mar 2, 2016
Priority date	Apr 8, 2015
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

A rotary atomizing head includes an outer peripheral surface washing passage open onto an atomizing head outer peripheral surface for causing wash fluid supplied from a feed tube to flow out into an annular clearance between the rotary atomizing head and a shaping air ring. An outflow opening of an outflow passage constituting the outer peripheral surface washing passage is provided in a position closer to the backside into the annular clearance by a length dimension than a front end surface of a front ring section constituting the shaping air ring. Further, the outflow opening opens to the annular clearance in an angle that is an acute angle to the atomizing head outer peripheral surface.

First claim

The invention claimed is:

1. A rotary atomizing head type coating machine comprising:
an air motor that uses compressed air as a power source;
a hollow rotational shaft that is rotatably supported by said air motor and a tip end of which projects to a front side from said air motor;
a feed tube that extends to the tip end of said rotational shaft through in said rotational shaft and includes a paint supplying passage which supplies paint or wash fluid and a wash fluid supplying passage which supplies wash fluid;
a rotary atomizing head, a base end side of which is formed of a cylindrical section mounted to the tip end of said rotational shaft and a portion closer to a front side than said cylindrical section of which is formed of a cup section enlarged in a cup shape to spray paint from a releasing edge of said cup section;
a shaping air ring that is arranged on an outer peripheral side of said rotary atomizing head, has a ring inner peripheral surface facing an atomizing head outer peripheral surface of said rotary atomizing head with an annular clearance, and has many shaping air spurting holes on a front end surface to spurt shaping air; and
an assist air spurting hole that is provided to open to said ring inner peripheral surface of said shaping air ring and spurts assist air into said annular clearance defined between said ring inner peripheral surface and said atomizing head outer peripheral surface of said rotary atomizing head, wherein
said annular clearance is located at an outer part of said rotary atomizing head and is formed as a conical thin space enlarged from a rear side toward the front side thereof, along said ring inner peripheral surface and said atomizing head outer peripheral surface,
said rotary atomizing head is provided with an outer peripheral surface washing passage open onto said atomizing head outer peripheral surface for causing said wash fluid supplied from said wash fluid supplying passage of said feed tube to flow out into said annular clearance,
an outflow opening of said outer peripheral surface washing passage is provided in a position closer to the backside into said annular clearance than a tip end of said shaping air ring and opens into said annular clearance in an angle that is an acute angle to said atomizing head outer peripheral surface of said rotary atomizing head, and
said assist air spurting hole opens into said annular clearance at a location closer to the rear side than said outflow opening of said outer peripheral surface washing passage.

2. The rotary atomizing head type coating machine according to claim 1 , wherein
said feed tube is formed as a double tube by an inner tube that is positioned in an axis center and through which said paint or wash fluid flows and an outer tube that is positioned on an outer peripheral side of said inner tube for flow of wash fluid between the inner tube and said outer tube, and
an inflow opening of said outer peripheral surface washing passage opens in the vicinity of a front end section of said outer tube in said feed tube.

3. The rotary atomizing head type coating machine according to claim 1 , wherein
said atomizing head outer peripheral surface of said rotary atomizing head holds said annular clearance between said ring inner peripheral surface of said shaping air ring and said atomizing head outer peripheral surface to be approximately constant with a small clearance dimension.

4. The rotary atomizing head type coating machine according to claim 1 , wherein
said feed tube is formed as a double tube by an inner tube that is positioned in an axis center and through which said paint or wash fluid flows and an outer tube that is positioned on an outer peripheral side of said inner tube and opens in a position closer to the backside than a tip end of said inner tube for flow of wash fluid between the inner tube and said outer tube,
said rotary atomizing head includes:
an annular wash fluid partition wall projecting in a radial inside in a position facing a front end section of said outer tube in said feed tube;
an annular paint partition wall projecting in a radial inside in front of said wash fluid partition wall and in a position of surrounding a projecting section of said inner tube; and
a hub member positioned on a cup-shaped inner peripheral surface of said cup section in front of said paint partition wall and having a hub paint passage on an outer peripheral side through which paint flows out,
a wash fluid reservoir provided between said wash fluid partition wall and said paint partition wall for reserving the wash fluid supplied from said outer tube of said feed tube, and
a paint reservoir provided between said paint partition wall and said hub member for reserving the paint supplied from said inner tube of said feed tube,
wherein an inflow opening of said outer peripheral surface washing passage opens to said wash fluid reservoir of said rotary atomizing head.

5. The rotary atomizing head type coating machine according to claim 1 , wherein
said atomizing head outer peripheral surface of said rotary atomizing head is formed with a cylindrical surface positioned on an outer peripheral side of said cylindrical section and a conical surface positioned on an outer peripheral side of said cup section, wherein
an inflow opening of said outer peripheral surface washing passage is provided to be perpendicular to an axis line of said rotational shaft and opens in a radial inward,
said outflow opening of said outer peripheral surface washing passage is positioned in said conical surface to be perpendicular to an axis line of said rotational shaft and opens in a radial outward, and
an angle between said outflow opening and said conical surface of said atomizing head outer peripheral surface is an acute angle.

6. The rotary atomizing head type coating machine according to claim 1 , wherein
said atomizing head outer peripheral surface of said rotary atomizing head is formed with an elongated cylindrical surface positioned on an outer peripheral side of said cylindrical section and a conical surface positioned on an outer peripheral side of said cup section,
an outflow opening of said outer peripheral surface washing passage constitutes an inclined opening to open on said elongated cylindrical surface in a state of being inclined forward to said rotational shaft, and
an angle between said outflow opening and said elongated cylindrical surface of said atomizing head outer peripheral surface is an acute angle.

Assignees

• Abb Schweiz Ag

Inventors

• Yamauchi Kuniharu

Classifications

• B05B15/55

  using cleaning fluids · CPC title

• B05B5/043

  using induction-charging · CPC title

• B05B5/0426

  Means for supplying shaping gas · CPC title

• B05B5/0415

  Driving means; Parts thereof, e.g. turbine, shaft, bearings · CPC title

• B05B5/0407

  with a spraying edge, e.g. like a cup or a bell · CPC title