Coating mist collection apparatus

Patent metadata

Field	Value
Publication number	US-9616453-B2
Application number	US-201414406702-A
Country	US
Kind code	B2
Filing date	Oct 3, 2014
Priority date	Dec 10, 2013
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

Powder is sprayed uniformly and favorably from a powder nozzle into processing target air. In a coating mist collection apparatus, coating mist in processing target gas is collected by filters in a state in which a coating mist trapping filter covering layer made up of an accumulated layer of powder is formed on the surface of the filters. The coating mist collection apparatus is provided with a powder dispersion means that obtains a uniform powder concentration in the air in sealed powder tanks by dispersing the powder stored in the tanks in a uniform floating dispersed state, and is provided with a spray air conveying means that supplies the powder in the floating dispersed state in the powder tanks along with carrier air to powder nozzles through powder supply passages.

First claim

The invention claimed is:

1. A coating mist collection apparatus comprising:
a filter that collects coating mist contained in processing target air discharged from a coating chamber; and
a powder nozzle that is arranged in an air guiding passage that guides processing target air to the filter, and sprays powder into the processing target air passing through the air guiding passage,
due to the processing target air, wherein the powder sprayed by, the powder nozzle is contained in a dispersed state, being passed through the filter, the coating mist in the processing target gas being collected by the filter in a state wherein a coating mist trapping filter covering layer made up of an accumulated powder layer is formed on a surface of the filter,
wherein a powder dispersion apparatus is provided for obtaining a uniform powder concentration in air in a sealed powder tank by dispersing powder stored in the tank in a uniform floating dispersed state, and
an ejector is provided for supplying the powder in the floating dispersed state in the powder tank along with carrier air to the powder nozzle through a powder supply passage in parallel with the uniformization of the powder concentration by the powder dispersion apparatus.

2. The coating mist collection apparatus according to claim 1 ,
wherein a filter regenerating apparatus is provided for regenerating the filter by causing the powder containing the coating mist to fall from the surface of the filter, and a receiving hopper is provided for receiving the powder containing the coating mist that falls from the surface of the filter,
the powder tank is arranged below the receiving hopper in a state, wherein an interior of the receiving hopper and an interior of the powder tank are in communication with each other through a powder discharge opening formed in a bottom portion of the receiving hopper, and wherein
a partition door is provided for opening and closing the powder discharge opening, and due to an opening operation of the partition door, the powder containing the coating mist that has accumulated in the receiving hopper is caused to fall into the powder tank through the powder discharge opening and stored therein, and the powder tank with powder stored therein is sealed by a closing operation of the partition door.

3. The coating mist collection apparatus according to claim 2 ,
wherein a discharge air conveying arrangement is provided for discharging the powder containing the coating mist stored in the powder tank from the powder tank along with carrier air through a powder discharge passage, and
a fresh powder air conveying arrangement is provided for supplying fresh powder not containing the coating mist along with carrier air to the powder tank through a fresh powder supply passage.

4. The coating mist collection apparatus according to claim 2 , wherein a discharge air conveying arrangement is provided for discharging the powder containing the coating mist stored in the powder tank from the powder tank along with carrier air through a powder discharge passage,
a fresh powder air conveying arrangement is provided for supplying fresh powder not containing the coating mist along with carrier air through a fresh powder supply passage, and
a valve is provided for switching the supply passage connected to the powder nozzle between the powder supply passage from the powder tank and the fresh powder supply passage.

5. The coating mist collection apparatus according to claim 3 , wherein a controller is provided for automatically executing powder recovery wherein, at a set recovery time interval, a partition door is opened and the accumulated powder containing the coating mist in the receiving hopper is caused to fall into the powder tank, and
in addition to executing the powder recovery, the controller automatically executes powder refreshing wherein, each time a coating work quantity in the coating chamber reaches a set threshold work quantity, or each time the number of times the partition door has opened reaches a set threshold number of times, the powder containing the coating mist in the powder tank is discharged through the powder discharge passage by the discharge air conveying arrangement, and a predetermined amount of fresh powder is supplied through the fresh powder supply passage by the fresh powder air conveying arrangement.

6. The coating mist collection apparatus according to claim 1 ,
wherein a filter regenerating apparatus is provided for regenerating the filter by causing the powder containing the coating mist to fall from the surface of the filter, and a receiving hopper is provided for receiving the powder containing the coating mist that falls from the surface of the filter,
a vacuum apparatus is provided for returning the powder containing the coating mist accumulated in the receiving hopper along with carrier air to the powder tank through a powder reflux passage,
a discharge air conveying arrangement is provided for discharging the powder containing the coating mist stored in the powder tank from the powder tank along with carrier air through the powder discharge passage, and
a fresh powder air conveying arrangement is provided for supplying fresh powder not containing the coating mist along with carrier air to the powder tank through a fresh powder supply passage.

7. The coating mist collection apparatus according to claim 6 , wherein a controller is provided for automatically executing powder recovery wherein, at a set recovery time interval, the accumulated powder containing the coating mist in the receiving hopper is returned to the powder tank by the vacuum apparatus, and
in addition to executing the powder recovery, the controller automatically executes powder refreshing wherein, each time a coating work quantity in the coating chamber reaches a set threshold work quantity, or each time the number of times powder has been returned by the vacuum apparatus reaches a set threshold number of times, the powder containing the coating mist in the powder tank is discharged through the powder discharge passage by the discharge air conveying arrangement, and a predetermined amount of fresh powder is supplied to the powder tank through the fresh powder supply passage by the fresh powder air conveying arrangement.

8. The coating mist collection apparatus according to claim 7 , wherein when a coating target object processing count in the coating chamber reaches a set threshold processing count, the controller determines that the coating work quantity in the coating chamber has reached the set threshold work quantity, and executes the powder refreshing.

9. The coating mist collection apparatus according to claim 7 , wherein the controller sets a powder load value corresponding to a coating target object coating condition in the coating chamber for each coating target object coating task, and integrates the powder load value in the coating target object coating task as coating target objects are successively coated, and when the integrated value of the powder load value has reached a set threshold integrated value, the controller determines that the coating work quantity in the coating chamber has reached the set threshold work quantity, and executes the powder refreshing.

10. The coating mist collection apparatus according to claim 9 , wherein the controller sets the powder load value based on any one of the type of coating target object, the type of coating material used on the coating target object, the type of coating task performed on the coating target object, and the coating target object coating location, or a combination of two or more of any of these.

11. The coating mist collection apparatus according to claim 6 ,
wh

Assignees

• Taikisha Kk

Inventors

• Sakita Kenji

Classifications

• Y02P70/10

  Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working · CPC title

• B01D46/42

  Auxiliary equipment or operation thereof · CPC title

• B05B15/0412

  Operations & Transport · mapped topic

• B05B15/002

  Operations & Transport · mapped topic

• B01D46/0068

  Operations & Transport · mapped topic