Operation method for coating exhaust treatment system

Patent metadata

Field	Value
Publication number	US-10512930-B2
Application number	US-201615556882-A
Country	US
Kind code	B2
Filing date	Feb 1, 2016
Priority date	Mar 11, 2015
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

Provided is an operation method for a coating exhaust treatment system that includes a filter configured to filter discharged air discharged from a coating chamber in which a coating object is spray-coated and collect overspray coating material included in the discharged air, and a powder dispersal means configured to disperse powder for forming a filter covering layer in the discharged air and form a filter covering layer made of a layer of the accumulated powder on a surface on the filter as the discharged air passes through the filter, the method including, when the number of repetitions of a first operation reaches a set number while the first operation and a second operation are being repeatedly carried out alternatingly, discarding coating material-containing powder and supplying fresh powder to a first supply tank, and when the number of repetitions of the second operation reaches the set number, discarding the coating material-containing powder and supplying the fresh powder to the second supply tank.

First claim

The invention claimed is:

1. An operation method for a coating exhaust treatment system including
a filter configured to filter discharged air discharged from a coating chamber in which a coating object is spray-coated and collect overspray coating material included in the discharged air, and
a powder dispersal means configured to disperse powder for forming a filter covering layer in the discharged air and form a filter covering layer made of a layer of the accumulated powder on a surface on the filter as the discharged air passes through the filter,
the method comprising:
in a first operation,
carrying out a first exhaust treatment step of dispersing the powder stored in a first supply tank in the discharged air using the powder dispersal means and causing the discharged air to pass through the filter, and
carrying out a first recycling step of recycling the coating material-containing powder in a relay tank using a recycling treatment portion and storing the recycled powder in a second supply tank and
a first storing step of storing the coating material-containing powder that was removed from the filter through filter cleaning treatment in the first exhaust treatment step in the relay tank after sending the coating material-containing powder in the relay tank to the recycling treatment portion in the first recycling step; and
in a second operation,
carrying out a second exhaust treatment step of dispersing the powder stored in the second supply tank in the discharged air using the powder dispersal means and causing the discharged air to pass through the filter, and
carrying out a second recycling step of recycling the coating material-containing powder in the relay tank using the recycling treatment portion and storing the recycled powder in the first supply tank and
a second storing step of storing the coating material-containing powder that was removed from the filter through filter cleaning treatment in the second exhaust treatment step in the relay tank after sending the coating material-containing powder in the relay tank to the recycling treatment portion in the second recycling step;
the method further comprising:
when the number of repetitions of the first operation reaches a set number while the first operation and the second operation are repeatedly being carried out alternatingly,
carrying out a first operation refreshing treatment of discarding the coating material-containing powder stored in the relay tank in the first storing step as powder at its usage limit, supplying fresh said powder to the first supply tank after the powder is supplied to the powder dispersal means in the first exhaust treatment step, and resetting the number of repetitions of the first operation; and
similarly, when the number of repetitions of the second operation reaches the set number,
carrying out a second operation refreshing treatment of discarding the coating material-containing powder stored in the relay tank in the second storing step as powder at its usage limit, supplying fresh said powder to the second supply tank after the powder is supplied to the powder dispersal means in the second exhaust treatment step, and resetting the number of repetitions of the second operation.

2. The operation method for a coating exhaust treatment system according to claim 1 , wherein
the number of repetitions of the second operation is set to reach the set number in the second operation carried out after the first operation in which the number of repetitions has reached the set number,
or, the number of repetitions of the first operation is set to reach the set number in the first operation carried out after the second operation in which the number of repetitions has reached the set number.

3. The operation method for a coating exhaust treatment system according to claim 1 , wherein
the number of repetitions of the second operation is set to reach the set number in the second operation carried out after the first operation in which the number of repetitions has reached approximately half of the set number,
or, the number of repetitions of the first operation is set to reach the set number in the first operation carried out after the second operation in which the number of repetitions has reached approximately half of the set number.

4. An operation method for a coating exhaust treatment system including
a filter configured to filter discharged air discharged from a coating chamber in which a coating object is spray-coated and collect overspray coating material included in the discharged air, and
a powder dispersal means configured to disperse powder for forming a filter covering layer in the discharged air and form a filter covering layer made of a layer of the accumulated powder on a surface on the filter as the discharged air passes through the filter,
the method comprising:
an exhaust treatment step of dispersing the powder stored in a supply tank in the discharged air using the powder dispersal means and causing the discharged air to pass through the filter;
a storing step of storing the coating material-containing powder that was removed from the filter through filter cleaning treatment in the exhaust treatment step in a relay tank;
a separation step of separating the coating material-containing powder in the relay tank into powder to be discarded and powder to be recycled at a set separation ratio set in advance in a fixed manner;
a discarding step of discarding the powder to be discarded that was separated in the separation step;
a recycling step of recycling the powder to be recycled that was separated in the separation step with a recycling treatment portion; and
a powder refreshing step of returning the powder recycled in the recycling step to the supply tank and supplying an amount of fresh said powder that is the same as that of the powder discarded in the discarding step to the supply tank, the steps being carried out repeatedly.

5. An operation method for a coating exhaust treatment system including
a filter configured to filter discharged air discharged from a coating chamber in which a coating object is spray-coated and collect overspray coating material included in the discharged air, and
a powder dispersal means configured to disperse powder for forming a filter covering layer in the discharged air and form a filter covering layer made of a layer of the accumulated powder on a surface on the filter as the discharged air passes through the filter,
the method comprising:
an exhaust treatment step of dispersing the powder stored in a supply tank in the discharged air using the powder dispersal means and causing the discharged air to pass through the filter;
a storing step of storing the coating material-containing powder that was removed from the filter through filter cleaning treatment in the exhaust treatment step in a relay tank;
a sorting step of sorting the coating material-containing powder in the relay tank into unsuitable powder to be discarded and suitable powder to be recycled;
a discarding step of discarding the unsuitable powder to be discarded that was sorted in the sorting step;
a recycling step of recycling the suitable powder to be recycled that was sorted in the sorting step with a recycling treatment portion; and
a powder refreshing step of returning the powder recycled in the recycling step to the supply tank and supplying an amount of fresh said powder that is the same as that of the powder discarded in the discarding step to the supply tank, the steps being carried out repeatedly.

6. An operation method for a coating exhaust treatment system including
a filter configured to filter discharged air discharged from a coating chamber in which a coating object is spray-coated and collect overspray coating material included in the discharged a

Assignees

• Taikisha Kk

Inventors

• SEKIGAWA Takuya

Classifications

• B01D2273/12

  Influencing the filter cake during filtration using filter aids · CPC title

• B05B16/00

  Spray booths (arrangements for collecting, re-using or eliminating excess spraying material in spray booths B05B14/40) · CPC title

• B05B14/435

  with means for cleaning the filters by gas flow, e.g. blasts of air · CPC title

• B05B14/437 Primary

  with means for introducing solid material into the air charged with excess material for preventing clogging of the filter · CPC title

• B05B14/10

  the excess material being particulate (for spray booths B05B14/48) · CPC title