JPH0220299B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a coating gun, and more particularly to a coating gun characterized by a cleaning mechanism for a filter built into the coating gun.

(Prior art) Paint guns usually have a built-in filter for filtering paint to prevent dust, foreign matter, etc. from getting mixed in and adhering to the paint film, but the filter can become clogged with long-term use. In such cases, the filters have traditionally been cleaned by running cleaning fluid instead of paint, or by removing them from the paint gun. However, with the former method, although the paint can be washed away, clogging cannot be eliminated, and with the latter method, not only is the work complicated, but cleaning is likely to be incomplete. I had a problem.

(Purpose) The present invention was made to solve this problem, and its purpose is to provide a new paint gun that can be easily and reliably cleaned with the filter attached to the paint gun. It's about making suggestions.

(Structure) Therefore, the details of the present invention will be explained below based on examples.

FIG. 1 shows an embodiment of the present invention, in which a coating gun body designated by reference numeral 1 in the figure has a cylindrical filter 13 built into its holder 2, and a cylindrical filter 13 at the lower end of the holder 2. The paint flowing in from the paint inlet 12 is filtered here and then supplied to the paint nozzle source chamber 15 located upstream of the needle valve 16 via the paint guide pipe 14. is provided with an air introduction passage 22 and a ventilation valve 23, and an air inlet 21 at the lower end of the holder 2.
The pressurized air flowing in from the paint nozzle 17 is guided through the above-mentioned ventilation valves 2 and 3 to the annular jet nozzle 24 that opens around the paint nozzle 17, and the pressurized air is jetted out from there. It is configured to attract and spray the paint.

By the way, in the coating gun main body 1 configured as described above, a flow path communicating with the cleaning liquid inlet 32 is provided in, for example, the paint nozzle source chamber 15 of the path leading from the filter 13 to the paint nozzle 17.
A cleaning liquid supply hose 36 is connected to a quick coupling 31 with a check valve provided at the cleaning liquid inlet 32, and when cleaning the filter 13, a cleaning liquid tank is connected to the cleaning liquid tank as shown in FIG. 3
The cleaning liquid in the paint nozzle chamber 15 can be introduced into the paint nozzle source chamber 15 through a filter 34 and a pressure pump 35.

In addition, the reference numeral 3 in the figure is a trigger for opening and closing the needle valve 16 and the ventilation valve 23, and 11 is a check valve for connecting a paint supply hose (not shown) during painting and a drain hose 41 during cleaning. Each figure shows a quick-fitting joint.

Next, a method of cleaning the filter 13 based on the above-described apparatus will be explained.

If the filter 13 becomes clogged due to long-term use, connect the cleaning fluid supply hose 36 to the quick coupling 31 provided at the cleaning fluid inlet 32 as shown in FIG. 2, and connect it to the paint inlet 12. The paint supply hose that had been installed is removed, and a drain hose 41 with a plug 42 for releasing the non-returning action of the joint 11 is connected thereto, and the pressure pump 35 is operated. As a result, the cleaning liquid in the cleaning liquid tank 33 enters the paint nozzle source chamber 15 from the cleaning liquid inlet 32, and further flows into the filter 13 from the direction opposite to the flow direction of the paint through the paint guide pipe 14, and the paint on the mesh Dust, foreign matter, etc. adhering to the inflow side surface are washed off together with the paint, and these are discharged from the drain hose 41 to the outside.

If the trigger 3 is pulled during this cleaning process, the cleaning liquid will be ejected from the paint nozzle 17, and this part can be cleaned at the same time by the flow of the cleaning liquid at this time. It can be effectively used when painting.

What is shown in FIGS. 3 and 4 is another embodiment of a painting gun equipped with two paint filters, and the holder 2 includes two rapid joints 11a,
11b, paint inlet 12a, 12b, cylindrical filters 13a, 13b, paint guide tubes 14a, 14b
is connected to the common paint nozzle source chamber 15, and this paint nozzle source chamber 15 is provided with a flow path that communicates with the cleaning liquid inlet 32. A cleaning liquid supply hose 36 is connectable to the joint 31 .

In this painting gun, one of the filters, for example 13a, that is suitable for the application and the paint is selected, and the paint supply hose is connected to the quick coupling 11a that communicates with this filter to perform painting. If you subsequently apply another coating or unclog this filter 13a, use the previously connected rapid joint 11a.
Remove the paint supply hose from and connect the drain hose 41a with a plug 42 for releasing the non-returning action of the joint 11a, while connecting the cleaning fluid supply hose 36 to the quick joint 31 provided at the cleaning fluid inlet 32. Then, the cleaning liquid in the cleaning liquid tank 33 is sent to the paint nozzle source chamber 15, and further, the cleaning liquid is flowed in the opposite direction to the flow of the paint toward the filter 13a used earlier to remove the paint or paint that has adhered there. Wash off dust, etc. and discharge. In addition, if necessary, as shown in Figure 4, both joints 1
Waste liquid hoses 41a and 41b are connected to 1a and 11b to simultaneously clean the two filters 13a and 13b.

The one shown in FIG. 5 is provided with check valves 18a and 18b in each of the paint guide pipes 14a and 14b extending from each filter 13a and 13b for paint filtering to the paint nozzle source chamber 15. Valve 1
Quick couplings 19a, 19b with check valves are provided between 8a, 18b and filters 13a, 13b,
The cleaning liquid supply hoses 36 can be connected individually, and the quick coupling 19 communicates with one or both of the filters 13a and 13b to be cleaned.
By connecting one or both of the cleaning liquid supply hoses 36a, 36b to a, 19b, the required filters 13a, 13b are cleaned.

In addition, in this painting gun, the check valve 18
By providing the parts a and 18b, it also has the function of preventing paint from entering other paint guide tubes 14 and filters 13.

(Effects) As described above, according to the present invention, since the cleaning liquid is flowed in the direction opposite to the flow direction of the paint through the paint filtration filter while it is attached to the paint gun, the filter is cleaned. Not only can cleaning the filter be done extremely easily and quickly, but by flowing the cleaning liquid in the opposite direction, it is possible to effectively remove dust, foreign matter, etc. adhering to the surface of the mesh on the paint inflow side, completely clogging the filter. can be resolved.

Moreover, when cleaning the filter, all you need to do is connect the necessary tubes to the pipe ends of the paint guide tube and the separate cleaning liquid inflow tube, which makes cleaning work extremely easy. By pulling the trigger, the nozzles can be cleaned at the same time, and color change painting with a single paint gun is also facilitated.

[Brief explanation of drawings]

Figures 1 and 2 are a side view and a circuit diagram of a painting gun that is an embodiment of the present invention, Figures 3 and 4 are a side view and a circuit diagram of another painting gun, and Figure 5 is a side view and a circuit diagram of another painting gun. It is a circuit diagram about a painting gun. 1... Paint gun, 3... Trigger, 12... Paint inlet, 13... Filter, 15... Paint nozzle source chamber, 22... Air introduction path, 31... Rapid disconnection, 3
2...Cleaning liquid inlet, 33...Cleaning liquid tank, 4
1...Drainage hose.

Claims (1)

[Claims] 1 At the inflow end of the paint guide pipe that communicates with the paint nozzle source chamber via a built-in filter, a connection part is provided that can switch and connect the paint supply pipe and the drain pipe;
A cleaning liquid inflow pipe is installed separately in the paint nozzle source chamber,
A painting gun comprising a connection part connected to a cleaning liquid supply pipe via a check valve at the inflow end of the pipe.