JPH0628203Y2 - Spray gun with built-in liquid change unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION Field of the Invention The present invention relates to changing the liquid used inside a spray gun.

Problems to be Solved by Conventional Techniques and Inventions A spray gun that changes the liquid used inside a conventional spray gun has a number of liquid supply hoses and a number of liquid supply hoses added to the number of liquids used. , A hose or a hose similar to a hose or a hose for supplying an operating medium for operating a paint supply chamber in the same number of liquid supply hoses as the interior of the spray gun and an on-off valve that opens and closes each liquid supply port It was connected to hoses other than those originally required. Therefore, the number of hoses connected to the spray gun is large, and in addition to the original mechanism of the spray gun, a mechanism driven by an operating medium for operating the opening / closing valve is attached, and the mechanism of the spray gun becomes complicated. However, there is a drawback that the weight becomes heavy and the size becomes large.

Means for solving the problem The liquid valve installed in the spray gun is a check valve, and the check valve is opened and closed by changing the pressure of the liquid used,
A mechanism for adjusting the pressure of the used liquid is installed in a place other than the spray gun body.

The operation and effect of the invention The invention is a spray gun having a liquid supply port through a check valve in which the number of used liquids is added to the cleaning liquid, and the same number of liquids as the liquid supply ports are supplied and pressure is applied. The spray gun is a device independent from the spray gun for adjusting the liquid, and the structure for changing the liquid in the spray gun has one liquid supply port and one check valve. By this point, the number of hoses connected to the spray gun is reduced by the same number as the liquid supply port, the structure of the spray gun is simplified, and the increase in weight and size due to the addition of the liquid changing part can be suppressed as much as possible. .

Embodiment An embodiment of the present invention will be described below with reference to FIG. 1 in the case of using two liquids.

Check valve openings 2a, 2 are provided at the tip of the spray gun body 1.
A paint supply chamber 3 communicating with b and 2c is formed, a valve seat 4 having a valve opening 5 is fitted to the tip thereof, and a needle 6 inserted into the paint supply chamber 3 is always advanced by a mechanism not shown. Then, the valve opening 5 is closed, and the needle 6 is retracted by a mechanism (not shown) to open the valve opening 5. An atomizing air hole 8 is formed at the tip of the spray gun body 1 so as to surround the entire circumference of the valve seat 4, and the compressed air supplied through the atomizing air passage 7 is ejected. A pattern forming air hole 10 is formed in a diagonal direction centered on the valve opening 5 so that the compressed air supplied through the pattern forming air passage 9 is ejected.
The check valve seats 11a, 11b, 11c having the check valve openings 2a, 2b, 2c are fitted to the spray gun body 1 and are always in communication with the check valve openings 2a, 2b, 2c. Spring supports 12a, 12b, 12c perforated to allow free movement of the interiors 15a, 15b, 15c.
Tension coil springs 13a, 13b held by
Extension coil spring 13 retracted by the elastic force of 13c
Check valves 14a, 14 connected to a, 13b, 13c
The check valve ports 2a, 2b, 2c are closed by b, 14c, and the pressure of the liquid filled in the check valve seat interiors 15a, 15b, 15c increases, so that the check valve 14a,
14b and 14c are pressed, and tension coil springs 13a and 13b,
The check valve openings 2a, 2b and 2c are opened by advancing against the elastic force of 13c. The liquid outlets 1 of the liquid pressure adjusting devices 16a, 16b, 16c in which the check valve seat interiors 15a, 15b, 15c are installed at positions apart from the spray gun body 1 via hoses not shown.
It communicates with 7a, 17b, and 17c. The liquid pressure adjusting devices 16a, 16b, 16c are cylinders 18a, 18c.
b, 18c and always has cylinder ends 28a, 28
tension coil spring 19 held by b and 28c
The cylinder liquid side chambers 23a, 23b, 23c are large in volume by being partitioned by the pistons 20a, 20b, 20c connected to the tension coil springs 19a, 19b, 19c retracted by the elastic force of a, 19b, 19c. When compressed air is supplied to the cylinder control chambers 22a, 22b, 22c from the compressed air inlets / outlets 21a, 21b, 21c, the pistons 20a, 20b, 20c are pushed against the elastic force of the tension coil springs 19a, 19b, 19c. By advancing, the volumes of the cylinder liquid side chambers 23a, 23b, 23c are made small. The cylinder liquid side chamber 23a, 2
3b and 23c are a mechanism (not shown) and a connecting rod 24a,
Open / close valves 25a, 25 connected by 24b, 24c
b, 25c and open / close valves 26a, 26b, 26c which are opened by means of a mechanism (not shown) and are moved forward by a mechanism (not shown). Inlets 27a, 27 communicating with a pump for water supply and a hose (not shown)
It communicates with b and 27c.

The present embodiment has such a structure. The liquid A is supplied from the liquid inlet 27a, the liquid B is supplied from the liquid inlet 27b, and the cleaning liquid C is supplied from the liquid inlet 27c. On-off valve 25
Opening and closing valve opening 2 by advancing a, 25b, 25c
6a, 26b, 26c are opened, and compressed air inlet / outlet ports 21a, 2
Cylinder control chambers 22a, 22b, 2 from 1b, 21c
2c to supply compressed air to the pistons 20a, 20b, 2
0c is advanced to move the cylinder liquid side chambers 23a, 23b, 2
The volume of 3c is small, and the opening / closing valve openings 26a, 26b, 26c
The liquids A, B, and C are filled in all the communicating paths from the check valves 2a, 2b, and 2c to the check valves 25a and 25a.
Opening / closing valve openings 26a, 2a by retracting b, 25c
6b, 26c are closed and compressed air inlets / outlets 21a, 21b, 2
Compressed air in the cylinder control chambers 22a, 22b, 22c is discharged from 1c and the pistons 20a, 20b, 20c are retracted to increase the volume of the cylinder liquid side chambers 23a, 23b, 23c and from the opening / closing valve ports 26a, 26b, 26c. By making the pressure of the liquids A, B, and C filled in the paths communicating with the check valve ports 2a, 2b, and 2c negative, the force can be added to the elastic force of the tension coil springs 13a, 13b, and 13c. The check valves 14a, 14b, 14c are retracted, and the check valve opening 2
a, 2b, 2c will be closed. The opening / closing valve port 26
In the work of filling the liquids A, B, and C in all the paths communicating from the a, 26b, and 26c to the check valve openings 2a, 2b, and 2c, the backflow contamination of the impure liquid due to the liquid mixture in the paint supply chamber 3 In order to prevent the above, the needle 6 is retracted and the valve port 5 is opened, and the filling work is performed with the liquid A, B, and C at a time interval with the cleaning of the liquid C for cleaning that also serves to clean the paint supply chamber 3 and the valve port 5. Make the filling work last. In this state, the liquid B is supplied to the paint supply chamber 3 and the needle 6 is retracted so that the liquid B can be sprayed at any time. In order to spray the liquid B at any time, the open / close valve 25b is moved forward to open the open / close valve port 26b. , Compressed air is supplied from the compressed air inlet / outlet 21b to the cylinder control chamber 22b to advance the piston 20b to reduce the volume of the cylinder liquid side chamber 23b, and the pressure of the liquid B resists the elastic force of the tension coil spring 13b. The check valve 14b is moved forward, the check valve port 2b is opened, and the needle 6 is retracted to fill the coating liquid supply chamber 3 filled with the cleaning liquid C with the liquid B. The impure liquid in which the liquids B and C are mixed is discharged from the valve opening 5 until all are replaced with the liquid B. When the inside of the paint supply chamber 3 is completely replaced with the liquid B, the needle 6 is moved forward so that the liquid B can be sprayed at any time.
Then, in order to prepare for spraying the liquid A at any time by supplying the liquid A to the paint supply chamber 3 and retracting the needle 6 from this state, the on-off valve 25b is retracted to open / close the valve opening 26b. Closed, the compressed air inlet / outlet port 21b is used to discharge the compressed air in the cylinder control chamber 22b, and the piston 20b is retracted.
Of the check valve 14 is increased by increasing the volume of the liquid B and making the pressure of the liquid B negative.
b is retracted and the check valve port 2b is closed. Open / close valve 2 for cleaning the paint supply chamber 3 filled with the liquid B
5c is moved forward to open the opening / closing valve opening 26c, compressed air is supplied from the compressed air inlet / outlet 21c to the cylinder control chamber 22c to move the piston 20c forward, and the volume of the cylinder liquid side chamber 23c is made small. The check valve 14c is advanced against the elastic force of the tension coil spring 13c, the check valve port 2c is opened to supply the cleaning liquid C to the paint supply chamber 3 filled with the liquid B, and the needle The impure liquid in which the liquids B and C are mixed is discharged from the valve port 5 until the interior of the paint supply chamber 3 is cleaned by retracting 6. When the inside of the paint supply chamber 3 is completely washed, the opening / closing valve 25c is moved backward to close the opening / closing valve port 26c, the compressed air in the cylinder control chamber 22c is discharged from the compressed air inlet / outlet 21c, and the piston 20c is moved backward. Cylinder fluid side chamber 23c
Of the check valve 1 by increasing the volume of the liquid C and making the pressure of the liquid C negative to add to the elastic force of the tension coil spring 13c.
4c is retracted and the check valve port 2c is closed. Subsequently, the on-off valve opening 26 is opened by advancing the on-off valve 25a.
a is opened, compressed air is supplied from the compressed air inlet / outlet 21a to the cylinder control chamber 22a to advance the piston 20a, the volume of the cylinder liquid side chamber 23a is made small, and the elastic force of the tension coil spring 13a is made by the pressure of the liquid A. Against this, the check valve 14a is moved forward, the check valve port 2a is opened, and the needle 6 is retracted to fill the paint supply chamber 3 filled with the cleaning liquid C with the liquid A. The impure liquid in which the liquids A and C are mixed is discharged from the valve port 5 until the entire inside of the liquid is replaced with the liquid A. When the entire interior of the paint supply chamber 3 is replaced with the liquid A, the needle 6 is moved forward so that the liquid A can be sprayed at any time. In this way, the liquid used in the spray gun is changed. As described above, in the present invention, the liquid valve installed in the spray gun is a check valve, the volume change mechanism is installed in the liquid path other than the spray gun body, and the opening / closing valve is installed on the upstream side. The number of hoses connected to the spray gun is smaller than that of the conventional one by the number of liquids in spite of the fact that the liquid changer used is built into the spray gun, and the structure of the spray gun is simple and light.

In the embodiment, the volume changing mechanism is a cylinder type, but it is obvious that this can be replaced by another mechanism such as a diaphragm type, and both are within the scope of the present invention.

[Brief description of drawings]

 FIG. 1 is a partially cutaway sectional view of an embodiment of the present invention. 1: Spray gun body 2a, 2b, 2c: Check valve port 3: Paint supply chamber, 5: Valve port 6: Needle 16a, 16b, 16c: Liquid pressure adjusting device 20a, 20b, 20c: Piston 25a, 25b, 25c : Open / close valve

Claims (1)

[Scope of utility model registration request] 1. A plurality of liquids are pressurized in a plurality of liquid valves, one of the liquid valves is activated and one of the plurality of liquids is pressure-fed to a liquid atomizing nozzle, and the liquid atomizing nozzle is provided. With a spray gun with a built-in liquid changer, which is atomized by and sprayed on the object to be coated,
The liquid valve is composed of a check valve, and "opens / opens" the liquid at locations other than on the spray gun main body on the upstream side of the multiple liquid pressure feeding paths.
A spray gun with a built-in liquid changer, characterized in that an on-off valve for performing "closing" is provided, and a volume changing mechanism for causing a volume change is provided in communication with a downstream portion of the on-off valve.