JPS5835318Y2 - spray gun - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a spray gun for mixing and atomizing two types of solutions for painting.

When spray painting a two-component paint, if the viscosity increases due to mixing the two components, use a spray gun that mixes the two components in advance and then transfers them through the spray gun. If a spray gun that mixes two liquids is used, the atomization performance tends to deteriorate, making it impossible to perform a smooth painting job.

This drawback is particularly noticeable when the two components undergo a curing reaction by mixing.

As a spray gun that overcomes these drawbacks, a spray gun with a special structure as shown below is commercially available under the trade name "erzetzkl" from Richard Tschitzpel of West Germany.

In other words, with this commercially available spray gun, the curing agent is ejected from the center of the spray gun, the paint is ejected concentrically from around the curing agent, and air is ejected from the outside of the paint, causing it to harden after being ejected from the spray gun. The agent and paint are mixed and atomized by air.

However, this spray gun has the disadvantage that the flow rate of the curing agent ejected from the center cannot be easily adjusted, so that the viscosity of the paint cannot be controlled to an appropriate level when it arrives at the object to be coated.

Furthermore, this spray gun has a drawback in that the curing agent that has accumulated in the center of the spray gun flows out after the completion of painting and contaminates the object to be coated.

In order to provide a spray gun free of the above-mentioned drawbacks, the present inventor previously disclosed the interior of the first pipe body for supplying the first solution as disclosed in Utility Application No. 51-113005 (Utility Model Application No. 53-31059). a second tube forming a conical surface and supplying the second solution; and a third tube supplying air to atomize the first and second solutions supplied from the first tube and the second tube. a needle valve that is movable relative to the first tube and cooperates with the conical surface to control supply of the first solution; I suggested a spray gun provided.

(In this invention, it is generally preferable that the first solution supplied from the first tube be used as a curing agent or a thickening solvent, and the second solution supplied from the second tube be used as a paint.

This is because the flow rate of the paint is usually much higher than the flow rate of the thickening solution.

However, if the ratios are approximately equal, the first solution may be used as a coating material and the second solution may be used as a curing agent or thickening solvent.

) However, the spray gun of the previous invention has a drawback in that after the spray gun is used, the paint that has accumulated inside the gun mixes with the curing agent and hardens and clogs the outlet hole of the first tube for discharging the curing agent.

On the other hand, it is not preferable in terms of atomization characteristics to make the first tube outlet large in diameter to prevent clogging.

The present invention provides a spray gun capable of removing the above-mentioned clogging, in which the tip of the first tube has a small inner diameter, and the tip of the needle valve has a tip with a diameter smaller than the inner diameter of the tip of the first tube. A small-diameter tip member that loosely fits into the section is provided protrudingly.

With this configuration, even if the small inner diameter tip of the first tube becomes clogged for some reason after the spray gun is used, the small diameter tip and needle valve will be moved relative to the first tube when the spray gun starts to be used next time. The first solution can be supplied from the first tube by moving the first solution to the second tube.

Furthermore, as an embodiment of the present invention, it is also possible to make the first tube movable in its axial direction.

In this case, the needle valve is also movable, and by fixedly installing the needle valve, the needle valve can be moved relative to the first tube in its axial direction.

Alternatively, the outer surface of the distal end of the movable first tube may be formed into a conical shape so that the supply of the second solution can be controlled in cooperation with a concave conical surface formed on the inner surface of the second tube.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a front sectional view of the first embodiment of the present invention;
The figure shows the left half of the left side view of FIG.

In FIG. 1, a through hole 1a is bored on the central axis of the spray gun body 1, a cylindrical recess 1b is formed continuously at the left end of the through hole 1a, and a cylindrical cylinder is formed continuously at the right end of the through hole 1a. A recessed portion 1C is formed.

The first tube body 5 of the present invention is slidably and hermetically fitted into the through hole 1a and the cylinder recess 1C.

That is, the first tube body 5 includes a piston portion 5a that fits into the cylinder recess 1C and a rod portion 5b extending leftward from the piston portion 5a.
A sealing member such as an O-ring 11, 13 or the like is attached to each of the cylinders 11 and 13b, and the cylinder recess 1C and the through hole 1a are sealed and fitted.

A tapered conical surface 5C is formed at the tip of the rod portion 5b.

Also, a through hole 5 is formed from the right end of the piston portion 5a to the rod portion 5b.
d, and the through hole 5d is formed into a conical surface 5e corresponding to the conical surface 5C at the tapered conical surface 5C, and a through hole with a small inner diameter is formed at the tip of the first tube 5 continuously from the conical surface 5e. 5
f and communicates with the left end of the first tube body 5.

After the compression spring 7 is attached to the right side of the piston portion 5a, a lid member 9 provided with a screw 9a that engages with a screw 1d provided on the spray gun body 1 is screwed and fastened.

A communication hole 9b located coaxially with the through hole 5d of the first tubular body 5 and having the same diameter, and a cylinder recess 9C communicating with the communication hole 9b are formed in the lid member 9.

The piston part 19a and the rod part 1 are connected to the through hole 5d of the first tube body 5, the communication hole 9b of the lid member 9, and the cylinder 4 part 9C.
The needle valve moving member 19 consisting of 9b is attached to the O ring 15.
．． 17 etc., and are slidably and sealingly fitted.

The conical surface 5 of the first pipe body 1 is connected to the left side of the needle valve moving member 19 via the connecting rod 21 so that the outer surface 23a is tapered into a conical shape.
The needle valve 23 corresponding to e is fixed, and the needle valve 23
A small inner diameter through hole 5f formed in the first tube body 5 at the tip of the
A tip small diameter member 25 having a smaller diameter is protruded and loosely fitted into the through hole 5f.

After attaching the compression spring 21 to the right end of the needle valve moving member 19, connect the screw 27a of the second lid member 27 to the screw 9d of the lid member 9.
Screw together.

A screw 27b is provided at the center of the second lid member 27, and a screw member 29 for restricting the retreat of the needle valve moving member 19 is screwed into the screw 27b.

Cylinder recess 1C of spray gun body 1 and lid member 9
Compressed air supply holes le and 9e are formed in the cylinder recess 9C, respectively, and communicated with a compressed air supply source (both not shown) via a compressed air supply pipe and a compressed air regulating valve, respectively.

When compressed air is supplied to the cylinder recesses 1c and 9c, the compressed air pressure pushes the piston parts 5a and 19a to the right in the figure, thereby moving the first pipe body 5 and the needle valve moving member 19 to the right, On the other hand, by stopping the supply of compressed air, the first pipe body 5 and the needle valve moving member 19 are moved to the left by the compression springs 7 and 21.

The movement timing of the first pipe body 5 and the needle valve moving member 19 can be moved independently of each other or in a predetermined relationship by controlling the supply of compressed air.

Furthermore, by forming a conical surface as shown or an annular cut (not shown) at the left end of the piston portions 5a, 19a, the pistons 5a, 19a that have moved to the left end can easily start moving rightward. It becomes possible.

The screw member 29 limits the rightward movement amount of the needle valve moving member 19.

The screw 31a of the second tube 31 is screwed into the screw 1f formed at the end of the cylindrical recess 1b of the spray gun body 1, and the second tube 31 is concentrically fastened to the first tube 5.

The second tube 31 has a conical surface 31 b and a conical surface 31 at the tip.
A disc-shaped collar 31 d has a small-diameter cylindrical portion 31 C continuous to b and is equipped with an atomizing compressed air supply hole 31 e.
has.

Also, inside the second tube body 31, there are a large cylindrical portion 31f, a conical portion 31g, and a small cylindrical portion 31, which approximately correspond to the external shape of the second tube body 31.
It forms h.

After installing the cylindrical separator 33 with a collar between the second tube 31 and the spray gun 1, the second tube 31 is screwed together to form two annular spaces 37 and 39.

The annular spaces 37, 39 communicate with a compressed air supply source (not shown) through compressed air supply holes 41a, 41b, 43 formed in the spray gun body 1, respectively.

Screw the screw 46 into the spray gun body 1 to open the compressed air supply hole 4.
The amount of compressed air supplied from 1a to the outer annular space 37 can be adjusted.

Small holes 33 a are equally spaced in the brim of the separator 33 to serve as holes for the air to flow out from the outer annular space 37 .

A first solution supply hole 1g is bored in the spray gun body 1, and a small hole 5g is bored in the rod portion 5b of the first tube 5, which communicates with the through hole 5d from the outside.

Therefore, the first solution is supplied from the first solution supply source (not shown) into the through hole 5d through the first solution supply hole 1g and the small hole 5g.
solution is supplied.

The position of the small hole 5g is such that the first tube body 5 is removed from the first solution supply hole 1g when moving to the left.

Further, a second solution supply hole 1h is communicated with the cylindrical recess 1b of the spray gun body 1, so that a second solution supplied from a second solution supply source (not shown) is transferred to the first pipe body 5. and the second
It is designed to be supplied between the tube bodies 31.

The third tubular body 45 has a cup shape, consisting of a cylindrical portion 47 and a disk portion 49 formed at the bottom of the cylindrical portion 47, and has a pair of corner portions 48 in the upper and lower directions continuous with the cylindrical portion 47 to the left. The protruding cylindrical portion 47 has a collar 47a on its outer periphery, and a total of four pattern-forming pressurized air injection holes 47b are provided on the inner surface of the tip side of the corner portion 48, two on the vertical line and two on the upper and lower sides, respectively, as shown in FIG.
The jet hole 47b communicates with the base of the collar 47a through a small axial hole 47C.

The small diameter cylindrical portion 31 of the second tube body 31 is attached to the disk portion 49.
A circular hole 49a is bored into which the cylindrical member d is loosely fitted with a small gap, and air jet holes 49b for preventing rebound are formed equidistantly around the circular hole 49a.

Referring again to FIG. 1, the collar 47a of the third tube 45 is held by a coupling 51 in the shape of a cap nut with a hole, and the screw 51a of the coupling 51 is formed on the left outer side of the spray gun body 1. The third tube 45 is positioned concentrically with the first tube 5 and the second tube 31 by screwing the third tube 45 into the screw 11 .

As a result, the circular 7L49a of the third tube and the second tube 3
An annular slit-shaped gap 47 between the small diameter cylindrical portion 31C of 1
Pressure air from the inner annular space 39 described above is ejected through d to atomize the first and second solutions.

Further, compressed air from the outer annular space 37 is ejected through the ejection hole 47b to form a pattern of the paint spray.

Next, the operation of the first embodiment will be explained.

The first solution supply hole 1g and the second solution supply hole 1h of the spray gun body 1 are communicated with the first and second solution supply sources, respectively.

The first pipe body 5 and the needle valve moving member 19 are connected to the compression spring 7
, 21 to the left and open the first solution supply hole 1g.
The small hole 5g connected to the hole 5g is removed from the hole 1g, and the conical surface 5C of the first tube 5 is in contact with the conical portion 31g of the second tube 31, and both the first and second solutions are discharged from the spray gun. Does not leak.

Next, by supplying predetermined compressed air from the compressed air supply holes le, 9e, and 43, the first pipe body 5 and the needle valve moving member 19 move to the right against the pressing force of the compression spring 7.21. The first solution passes through the first solution supply hole 1g and the small hole 5g, and the second solution ejected from the small diameter through hole 5f of the first tube body 5 flows from the second solution supply hole 1g to the first tube body. 5 and the second pipe body 31, and is atomized by the pressurized air from the ejection gap 47d, and the spray pattern is formed by the pressurized air from the ejection hole 47b.

By adjusting the compressed air pressure supplied from the compressed air supply hole 9e, the needle valve moving member 19 can be moved to move the needle valve 23 relative to the first pipe body 5. The flow rate of the first solution can be adjusted by changing the gap between 23a and the conical part 5e of the first tube 5, and by eliminating the gap at all, it is possible to prevent the first solution from flowing out.

Further, the maximum flow rate of the first solution can be restricted by restricting rightward movement of the needle valve moving member 19 by the screw member 29.

By making the tip of the first tube 5 have a small inner diameter, the first melt can be ejected with desired atomization characteristics.

In addition, as a countermeasure against clogging due to the small inner diameter of the tip of the first tube, a small diameter tip member 25 is provided protruding from the tip of the needle valve 23, so even if the small diameter through hole 5f at the tip of the first tube 5 is Even if a blockage occurs while the spray gun is not in use, this blockage will be removed as the needle valve 23 moves and the small diameter tip member 2 is removed.
5, the first solution can be mechanically removed and the first solution can be smoothly ejected when the spray gun is used next time.

By moving the first tube 5, the gap between the conical surface 5C at the tip of the first tube 5 and the conical portion 31g of the second tube 31 can be changed, and the flow rate of the second solution can be adjusted. Side 5
By colliding C with the conical portion 31g, it is possible to prevent the second solution from flowing out.

Next, a second embodiment of the present invention will be described with reference to FIG.

The second embodiment shown in FIG. 3 is the same as the first embodiment shown in FIG. 1 in many respects, so the same parts are given the same numbers and their explanation will be omitted.

In the second embodiment, unlike the needle valve 23 of the first embodiment, the needle valve 123 is fixedly supported, and its conical surface 123a is in the opposite direction to have a shape that widens toward the end, and a conical surface 113a that cooperates with the conical surface 123a of the needle valve 23. An annular valve seat member 113 having an annular shape is provided in the through hole 5d of the rod portion of the first tube body 5 using a suitable fastening member such as a machine screw 115.

After screwing the screw 19a on the right end of the needle valve moving member 19 into the screw of the lid member 109 and fixing it with the nut 111, the lid member 1
09 screw 109a to the spray gun body 1 screw 1d
Screw and tighten.

In the second embodiment, when compressed air is supplied from the compressed air supply hole 1e, the first tube 5 moves to the right against the pressure of the compression spring 7.

As a result, even if the small inner diameter portion of the tip of the first tube 5 is clogged, the small diameter tip member 25 fixed to the tip of the needle valve 123 can be moved by the relative movement between the first tube 5 and the small diameter tip member 25. The first solution is removed and the first solution can be ejected without any problem.

In addition, by moving the first tube body 5 to the right, a predetermined gap is formed between the conical surface 123a of the needle valve 123 and the conical surface 113a of the valve seat member 113 fixed to the first tube body, and the first solution is spread in a predetermined amount. It flows out at a flow rate.

At the same time, a predetermined gap is formed between the conical surface 5C of the first tube 5 and the conical portion 31g of the second tube 31, and the second solution flows out at a predetermined flow rate.

By changing the compressed air pressure supplied from the compressed air supply hole 1e, the flow rate ratio of the first and second solutions can be easily changed.

Further, after the use of the spray gun is finished, the conical surface 123a of the needle valve 123 and the conical surface 113a of the valve seat member 113 are closed and/or the small hole 5g connected to the first solution supply hole 1g is closed, so that the first solution is removed. supply was stopped and the first
The supply of the second solution is stopped due to the blockage between the conical surface 5C of the tube 5 and the conical part 31 of the second tube 31, and the supply of the second solution is stopped.
mixing of the solutions is prevented.

In the present invention, the needle valve is movable relative to the first pipe body, and the tip of the needle valve is provided with a small diameter member that loosely fits into the small inner diameter part of the tip of the first pipe body, so the spray gun Even if the tip of the first pipe body becomes clogged during the pause, the clog can be easily removed when the spray gun starts to be used next time, and the spray gun can be smoothly started to use.

[Brief explanation of drawings]

1 is a front sectional view of a first embodiment of the present invention, FIG. 2 is a left half of the left side view of FIG. 1, and FIG. 3 is a front sectional view of a second embodiment of the present invention. 1...Spray gun body, 5...1st
Pipe body, 31... Second pipe body, 45... Third pipe body, 23, 123... Needle valve, 25.
...Small diameter member at the tip.

Claims (1)

[Scope of utility model registration request] 1. A conical surface is formed inside the first tube for supplying the first solution, a second tube for supplying the second solution, and first and second tubes supplied from the first tube and the second tube. A third tube for supplying air for atomizing the solution is arranged concentrically with the first tube, and is movable relative to the first tube and cooperates with the conical surface to atomize the first solution. In a spray gun in which a needle valve for controlling the supply of water is provided in a first tube, the tip of the first tube has a small inner diameter, and the tip of the needle valve has a needle valve with a smaller inner diameter than the tip of the first tube. A spray gun characterized by having a small-diameter tip member protruding from the inner diameter tip portion that fits loosely. 2. The first tube is movable in its axial direction, and the outer surface of its distal end is formed into a conical shape, which cooperates with a concave conical surface formed on the inner surface of the second tube to supply the second solution. A spray gun according to claim 1 of the utility model registration, which is controllable.