Measuring and testing – Blower – pump – and hydraulic equipment
Reexamination Certificate
1998-01-12
2001-03-27
Raevis, Robert (Department: 2856)
Measuring and testing
Blower, pump, and hydraulic equipment
Reexamination Certificate
active
06205853
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for testing functions of constituting devices of a painting apparatus and an apparatus for the same.
2. Related Art
The conventional paint supply device is shown in FIG.
14
. As shown in
FIG. 14
, the paint supply device B comprises an air cylinder device
101
for a pump connected to an air supply such as an external air compressor (not shown) and a pump device
102
for painting connected under the air cylinder device
101
.
In particular, a cylindrical paint tank
104
of the pump device
102
is placed under the air cylinder device
101
over a support member
103
. A cap
106
having an inlet valve
105
of a ball valve is screwed in the lower portion of the paint tank
104
. An end of a valve rod
109
connected to a piston rod
108
of a piston
107
of the air cylinder device
101
is inserted into the upper portion of the paint tank
104
. There screwed in the valve rod
109
a hooked cylindrical member
112
which has a paint exhaust hole
110
constituted by a central hole and a side hole which are communicated from the other at one end and which comprises a delivery valve
111
of a ball valve at the other end having a small diameter. A seal member
113
is placed around the hooked cylindrical member
112
so as to prevent the paint from leaking when the pump is operated.
As the air cylinder device
101
for pump is operated, the piston
107
is driven, and the valve rod
109
together with the piston rod
108
is moved vertically. Then, the paint in the external paint tank PT is sucked into the paint tank
104
, and the paint in the paint tank
104
is supplied to the spray gun
116
through the paint exhaust hole
110
, an upper room
104
a of the paint tank
104
, a pipe
114
, and a regulator
115
. It should be noted that in order to limit the vertical movement of the piston
107
, a detecting rod
117
is connected to the upper portion of the piston
107
and an engaging part
118
is placed on the detecting rod
117
, so that the position is detected by external limit switches
119
,
120
. The regulator
115
is communicated to an air supply
122
through a solenoid valve
121
for adjusting the pressure. Further, the spray gun
116
is communicated to the air supply
124
for trigger operating through a trigger solenoid valve
123
.
However, with thus constructed paint supply device B, when the paint is supplied to the spray gun
116
, if the seal property of the seal member
113
of the pump device
102
for pump is lowered, the slide resistance due to the valve rod
109
is decreased. Since the reciprocating motion per unit time of the valve rod
109
is increased to obtain the necessary reference pressure, the frequent pulsation of the paint due to the reciprocating motion of the valve rod
109
cannot be adjusted by the regulator
115
. In result, the paint pattern is disordered. Further, this fasten the wear of the piston
107
which slides in the cylinder of the air cylinder device
101
and shortens the life time of the air cylinder device
101
.
Further, when any of parts or devices in the painting apparatus is replaced by a new one after it reaches life period, the new part is assumed to work normally and placed in the painting apparatus without it is tested.
However, in practice, when the new part or device is placed in the painting apparatus, the replaced part or device frequently does not work normally. In the manufacturing line, if the operation of the devices and the painting condition are checked by eye or gauge, and the defective is found, it can be replaced by a new one again. However, the instant change of the gauge cannot be checked, which causes the defectives.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method for testing functions of painting devices of a painting apparatus and an apparatus for the same, which supply the devices having stable quality to be in stalled in the paint apparatus.
First aspect of the present invention is a method for testing functions of painting devices of a painting apparatus.
The method for testing functions of painting devices of a painting apparatus comprising an air supply source, an air motor driven by air from the air supply source, a supply pump operated by the air motor, a plurality of paint tanks each containing paint, a valve selector for switching paints to be used, a spray gun having a switching cylinder, a spray nozzle for spraying the paint, and a pressure adjusting device for adjusting the pressure applied on the paint to be sprayed of the present invention comprises 1) providing a test painting system comprising the same devices as the painting apparatus and a paint supply system having the same pipe configuration as the painting apparatus, 2) providing fluid pressure sensors between each of the constituting devices of the test painting system, 3) providing air pressure sensors between each of the constituting devices of the test painting system, 4) measuring supply fluid pressure and exhaust fluid pressure of the constituting devices by the fluid pressure sensors and the air pressure sensors, and 5) comparing the measured supply fluid pressure and the measured exhaust fluid pressure, thereby the functions of the constituting devices of the test painting system is tested.
Here, an air pressure sensor may be provided at the air motor for operating the supply pump of the test painting system and the pressure controller of the test painting system. A fluid pressure sensor is provided between the supply pump of the pain supply pump for supplying paint from the paint tank and the valve selector, between the valve selector and the pressure controller and between the pressure controller and the spray gun. Functions of the consisting devices of the test painting system are tested by measuring the fluid pressure of the paint supply side of the constituting device and the fluid pressure of the paint exhaust side of the constituting device, detecting the difference between the measured fluid pressure of the paint supply side and the measured fluid pressure of the paint exhaust side.
Further, normally operated devices may be installed in the test painting system. One of the normally operated devices is replaced by a new device to be tested. The functions of the replaced new device are tested by driving the test painting system and spraying the paint.
A painting device functional testing apparatus for testing functions of painting devices of a painting apparatus comprising an air supply source, an air motor driven by air from the air supply source, a supply pump operated by the air motor, a plurality of paint tanks each containing paint, a valve selector for switching paints to be used, a spray gun having a switching cylinder, a spray nozzle for spraying the paint, and a pressure adjusting device for adjusting the pressure applied on the paint to be sprayed of the present invention comprises 1) the same devices as the painting apparatus and a paint supply system having the same pipe configuration as the painting apparatus, 2) fluid pressure sensors provided at the paint supply side and the paint exhaust side of the supply pump, the valve selector, the pressure controller and the spray gun, and 3) air pressure sensors provided at an air supply pipe extended from the air supply source to the air motor and at an air supply pipe extended from the air supply source to the pressure controller. The functions of each device of the painting apparatus are tested by replacing one of the devices by a new device to be installed in the painting apparatus, measuring the pressure at the paint supply side and the paint exhaust side of the replaced device, and detecting the pressure variation of the replaced device.
According to the method for testing the functions of the painting device of the present invention, the paint device functional testing apparatus is constituted as same as the manufacturing line. Accordingly, the functions of every devices to be utilized in the manufacturing lin
Dei Shinji
Ogawa Masao
Honda Giken Kogyo Kabushiki Kaisha
Liniak Berenato Longacre & White
Raevis Robert
LandOfFree
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