Fluid sprinkling – spraying – and diffusing – Slinger or splasher; or deflector rotated relative to effluent – Disc impeller type or bowl-like slinger or deflector
Reexamination Certificate
2001-08-22
2003-02-04
Derakshani, Philippe (Department: 3754)
Fluid sprinkling, spraying, and diffusing
Slinger or splasher; or deflector rotated relative to effluent
Disc impeller type or bowl-like slinger or deflector
C239S700000, C239S703000, C222S135000
Reexamination Certificate
active
06513729
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a two-package-mixing discharging device having a discharger for being supplied with two liquids individually fed under pressure and discharging a mixture of the liquids, and a two-package-mixing coating device for individually supplying a base compound and a hardener to respective passages in a dual-tube nozzle in a rotary atomizing head, mixing the base compound and the hardener with each other, and atomizing and discharging the mixture toward an object to be coated.
2. Description of the Related Art
There has been used a two-package-mixing coating (discharging) device for mixing a base compound and a hardener with each other and discharging the mixture to coat an object such as an automotive body or the like. One known two-package-mixing supplying device as such a two-package-mixing coating device is disclosed in Japanese utility model registration publication No. 2506381, for example.
The disclosed two-package-mixing supplying device will be described below with reference to
FIG. 7
of the accompanying drawings.
As shown in
FIG. 7
, a base compound X and a hardener Y are stored in respective reservoir tanks
1
a,
1
b
in which there are disposed ends of respective pressure-feed passages
2
a,
2
b.
The pressure-feed passages
2
a,
2
b
have other ends connected to respective inlet ports of a mixer
3
whose outlet port is connected to a coating gun
4
. Gear pumps
5
a,
5
b
are connected respectively in the pressure-feed passages
2
a,
2
b.
The gear pump
5
a
is connected to an air motor
8
by a speed reducer
6
, and the gear motor
5
b
is connected to the air motor
8
by a speed changer
7
.
For setting a mixing ratio for the base compound X and the hardener Y, the speed changer
7
is used to adjust the rotational speed of the gear pump
5
b
for delivering the hardener Y. Then, the air motor
8
is energized to rotate at a predetermined rotational speed, operating the gear pumps
5
a,
5
b
to supply the base compound X and the hardener Y respectively from the reservoir tanks
1
a,
1
b
to the mixer
3
at a given rate. The base compound X and the hardener Y are mixed with each other by the mixer
3
, and the mixture is supplied to the coating gun
4
, from which the mixture is applied to an object to be coated (not shown).
Since the main compound X and the hardener Y are supplied from the reservoir tanks
1
a,
1
b
directly to the gear pumps
5
a,
5
b,
the amounts of the main compound X and the hardener Y that are discharged from the gear pumps
5
a,
5
b
tend to vary depending on variations in the pressures which are usually applied to deliver the main compound X and the hardener Y from the reservoir tanks
1
a,
1
b
in the coating site. When the discharged amounts of the main compound X and the hardener Y vary, the mixing ratio for the base compound X and the hardener Y in the mixer
3
also varies, causing properties, such as color, hardness, etc. of the coating on a coated object such as an automotive body to be unstable. Therefore, the properties of the produced coating fail to be uniform.
Another known two-package-mixing coating device is disclosed in Japanese laid-open patent publication No. 2000-126654, for example.
As shown in
FIG. 8
of the accompanying drawings, the disclosed two-package-mixing coating device has a coating machine
1
c
comprising an inner tube
2
c,
an outer tube
3
c
disposed coaxially around the inner tube
2
c,
a rotatable shaft
4
c
disposed coaxially around the outer tube
3
c,
a bell cup
5
c
mounted on the tip end of the shaft
4
c,
and a lid
6
c
mounted on the tip end of the bell cup
5
c.
The inner tube
2
c
is supplied with a base compound
7
c,
and the space between the inner tube
2
c
and the outer tube
3
c
is supplied with a hardener
8
c.
When the bell cup
5
c
is rotated at a high speed by an air motor or the like, the base compound
7
c
supplied to the inner tube
2
c
and the hardener
8
c
supplied to the space between the inner tube
2
c
and the outer tube
3
c
are mixed into a coating mixture, which is discharged as an atomized mist from a gap
9
c
between the bell cup
5
c
and the lid
6
c
and applied to an object to be coated.
The base compound
7
c
and the hardener
8
c
are individually supplied to the bell cup
5
c
while being isolated from each other by the dual-tube structure. The base compound
7
c
is introduced from the inner tube
2
c
into the bell cup
5
c
in the direction indicated by the arrow H, whereas the hardener
8
c
is introduced from the space between the inner tube
2
c
and the outer tube
3
c
into the bell cup
5
c
in the direction indicated by the arrow H. Inasmuch as the base compound
7
c
and the hardener
8
c
are injected into the bell cup
5
c
in the same direction, the base compound
7
c
and the hardener
8
c
may possibly fail to blend sufficiently with each other even though they are guided along the inner shape of the lid
6
c.
When the base compound
7
c
and the hardener
8
c
do not blend sufficiently with each other, the mixed state of the base compound
7
c
and the hardener
8
c
tends to vary, resulting in unstable properties of the produced coating.
The base compound
7
c
is less liable to change its viscosity upon exposure to air and water. However, the hardener
8
c
quickly hardens when it contacts air and water. Therefore, the hardener
8
c
tends to be deposited and hardened on the tip end
2
d
of the inner tube
2
c.
If a hardened deposit exists on the tip end
2
d
of the inner tube
2
c,
then it causes a change in the discharged amount and direction of the hardener
8
c,
making properties of the produced coating unstable.
With the disclosed two-package-mixing coating device shown in
FIG. 8
, because the base compound
7
c
and the hardener
8
c
are individually supplied to the bell cup
5
c
while being isolated from each other by the dual-tube structure, the base compound
7
c
and the hardener
8
c
start to be mixed with each other only after they are discharged into the bell cup
5
c.
However, no attempt is made to design the bell cup
5
c
to improve the mixed state of the base compound
7
c
and the hardener
8
c,
e.g., to specify the distance T from the lid
6
c
to the tip end of the bell cup
5
c.
Therefore, the base compound
7
c
and the hardener
8
c
are uncontrollably mixed with each other. As a result, the base compound
7
c
and the hardener
8
c
may not be mixed sufficiently with each other, causing properties, such as color, hardness, etc. of the produced coating to be unstable.
SUMMARY OF THE INVENTION
It is a general object of the present invention to provide a two-package-mixing discharging device which is of a simple structure capable of mixing two liquids individually fed under pressure reliably at a desired mixing ratio.
A major object of the present invention is to provide a two-package-mixing coating device which is of a simple structure capable of mixing a base compound and a hardener reliably in a desired mixed state for effectively improving properties of a produced coating.
A two-package-mixing discharging device according to the present invention has first and second liquid supply passages for supplying first and second liquids fed under pressure from respective first and second liquid supplies to a discharger. The first and second liquid supply passages have first and second gear pumps for delivering the first and second liquids under pressure to the discharger, and liquid pressure control means disposed upstream of the first and second gear pumps.
The liquid pressure control means are capable of controlling the first and second liquids to be supplied to the first and second gear pumps, respectively, under respective predetermined pressures. The first and second gear pumps can thus discharge the first and second liquids at stable rates, so that the first and second liquids can be mixed with each other reliably at a desired mixing ratio.
A two-package-mixing coating device according to the p
Nozaki Hiroyoshi
Ochiai Hiroshi
Taguchi Hidenori
Tokin Shinobu
Derakshani Philippe
Honda Giken Kogyo Kabushiki Kaisha
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