JPH049103B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a spray gun for spraying ricin paint or mortar onto buildings, or painting automobiles.

(Conventional technology) Conventional spray guns open and close the paint spout.
This is done manually, regardless of air for atomizing the paint. Specifically, as shown in FIG. 6, a valve chamber 103 and a cylinder chamber 104 are formed in a gun body 101 having a grip rod 102. A nozzle chamber 105 is formed in the front part of the main body 101,
A nozzle 6 having a paint spout 107 is fitted into the nozzle chamber 105, a needle valve 108 for opening and closing the spout 107 is fitted into the nozzle 106, and air is supplied to the front of the nozzle chamber 105. Air cap 109 with spouts 110 and 111
While attaching the valve chamber 103, hold the lever 102.
The first chamber 105a and the second chamber 105 of the nozzle chamber 105 are connected to a passage 113 extending from the valve chamber 103.
An on-off valve 114 having a valve stem 115 is interposed between this passage 113 and the valve chamber 103, and an air flow rate regulating valve ( (not shown).

A spring 116 is attached to the on-off valve 114, which is normally biased in the closing direction, and the first chamber 105a is connected to the center side jet port 110 of the air cap 109, and the second chamber 105b is connected to the outside jet port 110. It is connected to the outlet 111, and is configured so that the atomization pattern of paint or the like by air can be changed by using the regulating valve.

Also, the needle valve 108 in the nozzle chamber 105
is extended rearward and plunged into the cylinder chamber 104, and the abutment body 117 is inserted and fixed into the needle valve 108, and the abutment body 117 and the cylinder chamber 10 are inserted in the cylinder chamber 104.
A spring 119 is interposed between the adjusting bolt 118 screwed into the rear end of the contact body 1.
A needle valve 108 is pushed out through the needle valve 17, and the needle valve 108 is configured to close the spout 107.

Further, an operating lever 120 is pivotally attached to the gun body 101, the valve stem 115 of the on-off valve 114 is brought into contact with the lever 120, and the contact body 117 of the needle valve 108 is opposed to each other at a predetermined interval, By swinging the operating lever 120, the valve stem 115 is first pushed, and then the abutment body 117 is pushed.

When the valve stem 115 is pushed by swinging the operating lever 120 as described above, the on-off valve 114 is opened against the spring 116, and air is ejected from the ejection ports 110 and 111. Also, after this, the abutment body 117 is pushed, which causes the needle valve 108 to open and the spout 107 to open.
Paint etc. are ejected from the spout 110,
It is atomized by air from 111.

(Problems to be Solved by the Invention) In the case of the spray gas having the above structure, the operating lever 120 is manually swung to push the contact body 117 and the needle valve 108
Since the needle valve 108 is easily moved, the needle valve 108 is easily gouged, and the smooth movement of the needle valve 108 is obstructed. However, if the pressing force by the spring 119 is weak, paint leaks from the paint spout 107, and if the pressing force by the spring 119 is strong, the swinging operation of the operating lever 120 is It becomes very heavy and causes great fatigue when working.

In addition, a gland packing is inserted into the needle valve 108 in order to seal air-filled areas and paint-filled areas.If this gland packing is tightened with a force greater than the strength of the spring 119, the needle valve 108's return movement was prevented,
In addition, paint leaks from the paint spout 107, and if the tightening force is weak, there are problems such as paint leaking from the seal and shortness of breath due to air suction.

(Means for Solving the Problems) The present invention was invented to solve the above problems, and includes a valve part having a valve chamber and a piston part having a piston chamber. is inserted so as to be able to reciprocate, and a valve device in the valve chamber controls air supply to the piston chamber to cause the piston to reciprocate, while a needle valve is provided at the front of the piston portion to open and close the piston. A nozzle portion having a paint spout and an air spout is provided, a needle valve of the nozzle portion is connected and held to the piston, and air is supplied to the air spout by a valve device in the valve chamber. The invention is characterized in that it is configured to be controlled by

(Function) The air flowing into the valve chamber flows into the head chamber side of the piston in the piston chamber through the valve device in the valve chamber, moves the piston forward, and causes the needle valve connected and supported to the piston to move the piston forward. is advanced and the paint spout is closed. In addition, by operating the valve device in the valve chamber, a part of the air in the valve chamber is sent to the nozzle section and is ejected from the air jet port. , by switching the valve device in the valve chamber to allow the paint to flow into the rod chamber side of the piston, the piston moves rearward, and the needle valve connected and supported by the piston is moved backward, thereby opening the paint spout; Paint is ejected from the ejection port, and the ejected paint is atomized by air from the air ejection port.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

In the figure, 1 is a gripping rod having an air supply pipe 2, and a valve part 3 having a valve chamber 4 is placed on the gripping rod 1.
is fixedly installed, and a piston chamber 6 is provided on this valve portion 3.
A piston part 5 having a nozzle chamber 8 is detachably attached to the front end of the piston part 5, and a nozzle part 7 having a nozzle chamber 8 is detachably attached.

The valve chamber 3 has an inlet 9, an outlet 10, and two communication ports 1, each of which communicates with the valve chamber 4.
1 and 12 are formed, and the inlet 9 is communicated with the air supply pipe 2, and the inlet 9 is connected to the air supply pipe 2.
A branch passage 13 is branched from the valve chamber 4, and the branch passage 13 is communicated with the valve chamber 4 through the communication ports 14, 15, while in the middle of the communication passage from the outlet port 10 to the valve chamber 4,
An on-off valve 17 is provided which is normally biased in the closing direction by a spring 18, and a valve stem 19 extends forward from the on-off valve 17, with the front end of the valve stem 19 protruding from the valve portion 3. Then, the valve part 3 is brought into contact with the operating lever 20 pivotally connected to the valve part 3. In addition, the valve chamber 4
Insert the piston valve 21 into the piston valve 2.
1 is configured to control communication of the communication ports 11 and 12 to the communication port 14 and the residual pressure vents 22 and 23. Note that these residual pressure vents 22, 23 and other residual pressure vents 24 are open to the outer surface of the valve portion 3, that is, to the atmosphere, and the outflow ports 10, the flow ports 11, 1
2 are connectors 10a and 1 for connecting piping, respectively.
1a and 12a are provided.

The piston portion 5 is removably attached to the valve portion 3 by a set bolt 25, and the set bolt 25 is attached using an inlet 28, which will be described later.
An inlet 28 is formed at a position opposite to the mounting hole of the piston, and a rotary operating tool such as a screwdriver is inserted into the inlet 28 through the piston chamber 6 to tighten and fix the set bolt 25 or to remove it. It is configured to do so. Further, the piston portion 5 is formed with flow ports 26 and 27 and an inflow port 28 which communicate with the piston chamber 6, and a piston 29 is inserted into the piston chamber 6, and a piston 29 is inserted into the piston chamber 6. A hollow cylindrical rod 30 is extended forward, and the front end of the rod 30 protrudes from the piston portion 5, and the center hole of the rod 30 is connected through a communication passage 31 formed in the piston 29. On the other hand, an adjusting bolt 32 is screwed into the rear wall of the piston portion 5 and held therein, and the rearward movement of the piston 29 is prevented by contacting the bolt 32. Configure to adjust and regulate. Furthermore, the above-mentioned distribution port 2
6, 27, and the inlet 28 are provided with connectors 26a, 27a, and 28a for connecting piping, respectively.

The nozzle part 7 is detachably attached to the front end of the piston part 5 by a connecting ring 33, and a nozzle 34 having a paint spout 35 is inserted into the nozzle chamber 8 of this nozzle part 7. At the same time, a needle valve 36 for opening and closing the spout 35 is inserted into the nozzle 34, and the needle valve 36
6 extends rearward and is removably connected to and held by a rod 30 extending from the piston 29 via a joint 37, while an air cap 39 is removably attached to the front end of the nozzle portion 7 by a connecting ring 38. . This air cap 39
is a plurality of air jet ports 4 arranged concentrically.
0, a plurality of air jet ports 41 arranged on a concentric circle with a diameter larger than this circle, and a pair of air jet ports 42 arranged oppositely. The air jet port 42 is communicated with a first chamber 8a formed by returning air to the nozzle chamber 8 via a communication passage 43, and the air jet port 42 is communicated with a second chamber 8b formed in the same manner via a communication passage 44. There is. The nozzle portion 7 also includes a paint supply port 45 that communicates with the nozzle chamber 8, and a paint supply port 45 that communicates with the nozzle chamber 8.
An inlet 46 communicating with the chamber 8a and the second chamber 8b is formed, and a flow rate regulating valve 47 is interposed in the communication path between the inlet 46 and the second chamber 8b. The aim is to control the amount of air supplied to change the atomization pattern of the paint. Note that the inflow port 46 is provided with a connector 46a for connecting piping.

The nozzle section 7 described above is used when applying general paint to automobiles, etc., and when spraying ricin paint or mortar onto buildings, a nozzle section 7' as shown in FIG. 5 is used. This nozzle part 7' for buildings is removably attached to the front end of the piston part 5 by means of a connecting ring 33', similar to that for general painting, and the nozzle chamber 8' in this nozzle part 7' is A nozzle cap 34' having a paint spout 35' is fitted into the front opening, and a needle valve 36' having an air jet passage 36'a in the center is inserted into the nozzle chamber 8'. , the needle valve 36' is configured to close the spout 35', and the needle valve 36' extends rearward to be detachable from the rod 30 extending from the piston 29 via a joint 37'. Configure to maintain connection. 45' in the figure
is the paint supply port.

The spray gun of the present invention is constructed as described above, and when painting an automobile or the like, the nozzle part 7 is used, the nozzle part 7 is attached to the front end of the piston part 5 as shown in the figure, and the needle is attached to the front end of the piston part 5. valve 36
is connected and held to the rod 30, and a paint supply pipe extending from a paint tank (not shown) is connected to the paint supply port 45 of the nozzle part 7, and the paint in the tank is forcedly filled into the nozzle chamber 8 from the supply port 45. let

Connector 1 of outlet 10 in one valve part 3
0a and the connector 46a of the inlet 46 in the nozzle part 7, and the connectors 11a, 1 of the flow ports 11, 12 in the valve part 3.
2a and the flow ports 26, 27 in the piston portion 5
Connect the connectors 26a and 27a with pipes,
In addition, the air supply pipe 2 is connected to an air source (not shown) not shown.

Thus, the pressurized air from the air source is transferred to the supply pipe 2.
flows into the valve chamber 4 via the inlet 9, and
The air flows into the back pressure chamber side of the piston valve 21 in the valve chamber 4 through the branch passage 13 and the communication port 15, and pushes the piston valve 21 forward to direct the air from the inflow port 9 to the branch passage 13 and the communication port. Piston 29 in piston chamber 6 via port 14, flow port 12, and flow port 27
The piston 29 is sent to the back pressure chamber side and the piston 29 is pushed forward. At this time, the rod chamber side of the piston 29 is opened to the atmosphere via the communication port 26, the communication port 11, and the residual pressure release port 22.
9 is allowed to move forward, the needle valve 36 is advanced forward via the rod 30, and the nozzle 34
The paint spout 35 is closed.

In this state, grip and operate the operating lever 20,
When the on-off valve 17 in the valve chamber 4 is pushed against the spring 18 to open the on-off valve 17, the air in the valve chamber 4 flows from the outflow port 10 through the inflow port 46 to the first nozzle chamber 8. The air flows into the chamber 8a and the second chamber 8b, and is ejected from the air outlets 40, 41, 42 of the air cap 39 via the communication passages 43, 44. Next, the operation lever 20 is further squeezed and operated to push the piston valve 21 in the valve chamber 4 rearward via the on-off valve 17, and thereby the piston 2
The back pressure chamber side of the piston 29 is opened to the atmosphere through the circulation port 27, the circulation port 12, and the residual pressure release port 23, and the air from the branch passage 13 is introduced into the rod chamber side of the piston 29 through the circulation port 11 and the circulation port. 26, this piston 29 is pushed rearward, the needle valve 36 is moved rearward through the rod 30, and the nozzle 3
4 is opened, and the paint in the nozzle chamber 8 is jetted out. The paint ejected from the ejection port 35 is atomized by the air ejected from the ejection ports 40, 41, and 42, and the atomization pattern is as follows.
The flow rate adjustment valve 47 is changed, for example, the adjustment valve 4
When the flow rate of air ejected from the jet port 42 is reduced in step 7, the paint is atomized in a circular shape, and as the air flow rate increases, the atomization pattern of the paint becomes elliptical.

On the other hand, when spraying ricin paint, mortar, etc. onto a building, a nozzle section 7' is used, and instead of the nozzle section 7, this nozzle section 7' is attached to the front end of the piston section 5.
Connecting and holding the needle valve 36' to the rod 30,
and the connector 10 of the outlet 10 in the valve part 3
a and the connector 28a of the inlet 28 in the piston portion 5 are connected by a pipe.

In this way, when the on-off valve 17 is opened in the same manner as above,
The air in the valve chamber 4 flows from the outlet 10 to the inlet 2.
8. The paint is ejected from the paint spout 35' of the nozzle cap 34' through the communication passage 31, the center hole of the rod 30, and the air jet passage 36'a, and the paint spouted from the spout 35' is granulated. . Note that the opening and closing of the jet port 35' by the needle valve 36' is performed in the same manner as described above, so a description thereof will be omitted.

In the present invention, air is supplied to the piston chamber 6 through the branch passage 13, but instead of this, a flow passage 4 is provided in the piston valve 21 as shown in FIG.
8 and from the flow path 48 to flow paths 11 and 12.
It may also be supplied to the piston chamber 6 via.
In addition, the residual pressure vents 22, 23 in the previously described embodiments,
24 may be communicated with the inside of the grip lever 1 via a residual pressure release passage 45 as shown in the figure. 6th
In the figure, 50, 51, 52 are the residual pressure vent 22,
It is a blind pin that closes the openings of 23 and 24, and 5
Reference numeral 9 denotes an air vent hole formed at the bottom of the grip lever 1.

Further, in the embodiments described above, the structure of the nozzle portions 7, 7' includes the paint spout 35, the air spout 40,
Any structure may be used as long as it includes 41 and 42.

In addition, the outflow port 10, the inflow port 26, 46, and the distribution port 1
The communication between 1 and 12 and the flow ports 26 and 27 is not limited to pipe connection using a connector as in the embodiment. For example, communication passages may be formed in each part and communicated as each part is installed. You may also do so.

(Effects of the Invention) As explained above, in the spray gun according to the present invention, the needle valve is connected and supported by the piston of the piston portion, and the reciprocating movement of the piston causes the needle valve to move, that is, open and close. The opening and closing operations of this needle valve can be performed extremely smoothly, and the needle valve can reliably close the paint spout to prevent paint leakage from the paint spout. This is done by a valve device inside the valve chamber, which makes the operation extremely light and easy, and reduces operator fatigue.

In addition, the gland packing can be strongly tightened to seal air-filled areas and paint-filled areas where the needle valve penetrates.In other words, when the gland packing is tightened strongly, the air pressure acting on the valve device or the air pressure receiving area By increasing the value, it is possible to overcome the resistance caused by the tightening of the gland packing and ensure the opening/closing operation of the needle valve.

Moreover, in the present invention, the needle valve is connected and supported by a piston, and the reciprocating movement of the piston causes the needle valve to move forward or backward to open and close the paint spout. Compared to a needle valve that is moved by a grip operation, the amount of movement (stroke) of the needle valve can be increased, and the paint spout can be opened wide, allowing high Even viscous paint can be reliably ejected.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing one embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a rear view thereof, Fig. 4 is a sectional view taken along the line A-A in Fig. 1, and Fig. 5 is a sectional view thereof. FIG. 6 is a longitudinal sectional view of a main part showing another embodiment, and FIG. 7 is a longitudinal sectional view of a conventional example. 3... Valve part, 4... Valve chamber, 5... Piston part,
6...Piston chamber, 7...Nozzle section, 17...Opening/closing valve, 21...Piston valve, 29...Piston,
35, 35'... Paint spout, 36, 36'... Needle valve, 40, 41, 42... Air spout.

Claims (1)

[Claims] 1. A valve part having a valve chamber and a piston part having a piston chamber, a piston is fitted into the piston chamber so as to be able to reciprocate, and a valve device in the valve chamber controls air supply to the piston chamber, While the piston is configured to reciprocate, a nozzle portion having a paint spout and an air spout that are opened and closed by a needle valve is provided at the front of the piston, and the needle valve of this nozzle portion is connected to the piston. 1. A spray gun characterized in that the spray gun is configured to be connected and held to the air outlet, and the air supply to the air outlet is controlled by a valve device in the valve chamber.