JPH0745018B2 - Mixed spray gun - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a mixing type spray gun capable of easily removing clogging of a discharge port and streamlining a coating operation of a mixing type coating agent.

[Conventional technology]

Conventionally, various paints such as polyester and polyurethane resin paints, which are solidified by mixing main ingredients and auxiliaries, and coating agents such as adhesives, have been conventionally mixed by mixing the two liquids and then spraying them using a spray gun or the like. It was However, since the mixed solution of this product passes through the spray gun, it is necessary to surely wash it after use or each time the coating material is changed to prevent malfunction of the valve mechanism and the like due to solidification inside.

In order to solve one of these problems, the inventors of the present invention, in Japanese Utility Model Laid-Open No. 60-28054, provide a second coating material flow path leading to the air outlet at the tip of the air cap, and from the outlet. A spray gun has been proposed which prevents solidification inside the gun by mixing the second coating material that is atomized and discharged and the first coating material that is discharged from the discharge port in the atomized state.

[Problems to be Solved by the Invention]

However, the main component used in such a mixed-type coating material is often a high-viscosity material that requires high-pressure ejection, and ejection failure occurs even if the ejection port is slightly clogged with foreign matter or the like. Moreover, in the case where the main agent and the auxiliary agent are mixed in the atomized discharge state, the auxiliary agent is likely to adhere to the discharge port due to divergence of the atomized auxiliary agent, dripping, etc. There is a problem that the agent and the main agent in the discharge port react with each other to cause clogging of the discharge port.

However, removal of such clogging requires time and labor such as disassembling of the nozzle fitting, which is a major problem of lowering the efficiency of the coating work.

The present invention is based on the provision of a rotatable rotary base body having a first discharge port at one end and an inflow port having a larger diameter than the first discharge port at the other end on the nozzle fitting, and the first discharge port is provided. It is an object of the present invention to provide a mixed type spray gun which can easily remove the clogging of the mixed type coating agent and greatly improve the coating work efficiency of the mixed type coating agent.

[Means for Solving the Problems]

In order to achieve the above object, the mixed spray gun of the present invention has a first coating agent atomized and discharged from a first discharge port provided in a nozzle fitting at the front end of the gun body, and a spray from a second discharge port. A mixing type spray gun that mixes with a second coating agent that is sprayed and discharged in the atomized state, the first inlet being connected to a first feeding device that feeds the first coating agent. A first opening / closing valve having a first valve shaft that opens and closes a first coating material flow path leading from the end to the nozzle fitting and a second feeding device that feeds a second coating material are connected. A second on-off valve having a second valve shaft that opens and closes a second coating material flow path from the second inlet end to the second discharge port; and a second on-off valve downstream of the second on-off valve. ,
An air flow path having one end connected to the second coating material flow path and the other end connected to a high-pressure air source, while pulling both the first valve shaft and the second valve shaft. The gold is provided on the gun body, and the nozzle fitting has the first discharge port at one end and extends from the first discharge port and has a larger diameter than the first discharge port provided at the other end. A rotary base body having a hole connecting to the inlet and capable of rotating, and rotating to reverse the first discharge port or the inflow port to communicate with the first coating fluid passage, Moreover, the second on-off valve guides the second coating material to the downstream side of the conduction position of the air flow path and supplies the high pressure from the air flow path when the second valve shaft is opened. The nozzle tube extends through the second coating material flow path that mixes with air and atomizes.

[Action]

The mixed-type spray gun configured as described above discharges the first coating agent fed through the first coating agent flow path from the first discharge port through the inflow port to perform normal coating. Can work. When clogging occurs in the hole and the first discharge port, the rotary substrate is reversed and the clogging material is discharged from the inflow port through the first discharge port together with the first coating agent. Can be removed externally.

By providing the rotary substrate in this manner, the clogging material can be easily discharged without needing to disassemble and clean the nozzle fitting, and the coating work efficiency can be improved. Moreover, since it is possible to instantly discharge the clogging material, especially when the coating material is an adhesive, it is possible to prevent the generation of defective products caused by the coating material hardening on the work surface due to the interruption of the coating, improving the yield and improving the product quality. Can also be improved. The second on-off valve is
It extends in the second coating material channel which is guided to the downstream side of the conduction position of the air channel and the second coating material channel and is mixed with the high pressure air fed from the air channel to be atomized. By providing the nozzle tube, it is possible to prevent the second coating material from flowing into the upstream side of the tip of the nozzle tube, which is useful for preventing clogging of the air flow path and the second coating material flow path.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

In the figure, the mixed spray gun 1 includes a first opening / closing valve 12 for opening and closing a first coating material flow path 10 leading to a nozzle fitting 3 at the front end of a gun body 2 and a second discharge port 6 provided in the nozzle fitting 3.
And a second opening / closing valve 19 for opening / closing the second coating material flow path 16 communicating with the second coating material flow path 16, while one end on the downstream side of the second opening / closing valve 19 is connected to the second coating material flow path 16. A first coating agent having an air flow path 40, which is pressure-fed from the first feeding device 7 and is atomized and ejected in an airless manner from a first ejection port 5 provided in the nozzle fitting 3; The second high-pressure air which is pressure-fed from the feeder 13 and flows through the air flow path 40 is atomized inside the second coating material flow path 16 and is discharged from the second discharge port 6. The coating material is mixed in the atomized discharge state.

As shown in FIG. 3, the gun body 2 has a cutout 41 on the lower surface of the center.
It has a pistol shape in which a handle 43 is formed at the rear end of the body portion 42 provided with a first inlet end 9 for screwing a first coating nipple 44 on the lower surface of the front end of the body portion 42 of the gun body 2. And a second coating fluid passage 16 leading to a second inlet end 15 where the second coating nipple 86 is screwed at the lower end of the handle 43.

The first coating material flow passage 10 is composed of a vertical hole 45 extending from the first inlet end 9 and an inner hole 46 opening at the front end of the body portion 42.
The first coating agent flow path 10 is connected to the central hole 47 of the nozzle fitting 3 that is attached to the nozzle 42 via the cap nut 39, and
It is opened and closed by the on-off valve 12 of.

The first on-off valve 12 has a valve seat fitting 49 which has a guide hole concentric with the inner hole 46 and is screwed into the inner hole 46, and a first valve shaft 11 which opens the guide hole with the backward movement. The first valve shaft 11 closely penetrates a seal fitting 50 that closes the rear portion of the inner hole 46, and a piston 52 that slides in an air chamber provided at an upper end of a handle 43 is attached to a rear end of the first valve shaft 11. The air chamber is a through hole provided in the handle 43.
It is formed by a tubular metal piece 55 attached to 53.

The through hole 53 is a stepped hole having a small diameter portion in the front through a step, and the tube fitting 55 includes a base tube 56 and a cap 57 screwed to the rear end.

The base cylinder 56 has a peripheral groove 59 for passing high pressure air and a second peripheral groove 60 for passing a second coating agent on a peripheral surface which is tightly fitted into the through hole 53 via a sealing material, and the cap 57 is provided. And the stepped portion of the through hole 53. Further, the base cylinder 56 has the piston at the center thereof.
A guide hole 61 for slidably holding 52 is provided, and the air hole is formed by the guide hole 61 and the inner hole of the cap 57. An air vent hole is provided in the cap 57, and an adjusting screw 63 having an adjusting shaft 62 protruding forward is screwed into the rear end of the cap 57 so that the adjusting screw 63 can move forward and backward. The first valve shaft 11 is urged forward by a spring piece interposed between the piston 52 and the cap 57 to move forward, and is pivotally supported by the gun body 2 so as to be swingable and the notch portion 41.
The plate portion of the trigger 20 hanging between them engages with the front end of the piston 52 so that the trigger 20 is pulled to directly pull and retract.
The guide hole of the valve seat fitting 49 is the central hole of the nozzle fitting 3.
Continue to 47.

As shown in FIG. 4, the nozzle fitting 3 includes a base 65 having a protruding portion 65B bulging on the front surface of the collar portion 65A that is locked to the cap nut 39, and the base 65 has steps 66A and 66B. While the stepped hole 66 opens at the front opening 67 on its front surface, the stepped hole 66
A joint cylinder 69 that is locked at the step 66A and has a connection hole 69A is fitted in the 66, and the rotary base 29 is housed between the step 66B and the joint cylinder 69.

The rotating base 29 has a substantially spherical shape with both ends cut along a plane,
A first discharge port 5 is opened at one end, and a hole portion 27 extending from the first discharge port 5 and connecting to an inflow port 26 having a diameter larger than that of the first discharge port 5 provided at the other end is transparently provided. It Although the hole 27 is formed as a tapered hole in this example, it may be formed in various shapes such as a stepped hole.

Therefore, in this example, the connection hole 69A and the hole 27 allow the first
The central hole 47 communicating with the coating fluid channel 10 is formed.

The rotating base 29 has a spherical peripheral surface, the front opening 67, and the connecting hole 69.
The respective dimensions are set so that A and A can be brought into close contact with each other, and the rotatably held by the holding means 70.

The holding means 70 includes a rotary shaft 71 that is locked in a locking hole 29A at the upper end of the rotary base 29, and a flange 71A peripheral surface of the rotary shaft 71 that is bulged on the upper surface of the protruding portion 65B and loosely fits the flange. A cylindrical portion 72 having a stepped hole 72A that engages with the lower surface of 71A,
The rotation cylinder comprises a holding cylinder 73 that is inserted into the cylindrical portion 72 and holds the flange 72A in place, and an operation cap 75 that loosely fits the upper end of the holding cylinder 73 and projects the lever piece 75A to one side. The shaft 71 and the operation cap 75 are integrally rotatably fixed via a nut fitting 76. Therefore, the first discharge port 5 and the inflow port 26 can be repositioned by rotating the rotary base 29 by the finger operation of the lever piece 75A. As a result, for example, the first coating agent is solidified, latent impurities, etc.
When the discharge port 5, the hole 27 or the inflow port 26 is clogged, the solidification, impurities and the like can be discharged to the outside of the gun together with the first coating agent by performing the position change.

The base 65 of the nozzle fitting 3 has the second discharge ports 6, 6
A coating material sub-channel 16A leading to the is formed. Note that the coating sub-channel 1
6A cooperates with a coating material main channel 16B, which will be described later, provided in the gun body 2 to form the second coating material channel 16, and as shown in FIGS. A semicircular hole concave groove 78 provided on the rear surface of the collar portion 65A, and a guide hole 81 having one end open at both ends of the concave groove 78 and the other end extending forward is opened at a projecting piece 80 on the front surface of the protruding portion 65B. The guide hole 81 communicates with the second discharge port 6 of the nozzle piece 82 screwed onto the projecting piece 80. The second
The second coating agent discharged from the discharge ports 6, 6 and the first coating agent discharged from the first discharge port 5 intersect in the front of the nozzle fitting 3 and are mixed with each other. 6 and 6 are formed so as to be inclined inward with respect to each other. The groove 78 is a seal piece 83A.
Seal ring that attaches to the base body 65 with screw fittings 83 having
It is closed by 85 and is connected to the coating material main flow path 16B of the gun body 2 by the joint pipe 85A of the seal ring 85.

As shown in FIG. 3, the coating material main flow path 16B has a vertical hole 88 extending from the second inlet end 15 at the lower end of the handle to an inner hole 90 above the handle 43.
Through the second opening / closing valve 19, the nozzle tube 99 extending from the second opening / closing valve, the front portion of the inner hole 90, and the guide hole 89, and is electrically connected to the joint pipe 85.

The second opening / closing valve 19 is slidably held forward and backward by closely penetrating the valve cylinder 91 screwed into the small diameter portion of the inner hole 90 and the mounting nut 93 at the rear end of the inner hole 90. A second valve shaft having a second valve shaft 17 and biased forward by a spring piece 92 interposed between a washer at the front portion of the second valve shaft 17 and the mounting nut 93.
When the front end of the valve 17 comes close to the valve cylinder 91, the main coating fluid channel 16B, that is, the second coating fluid channel 16 is opened and closed.

Further, as shown in FIGS. 1 and 2 (b), the second valve shaft 17 has nut fittings 95A and 95B screwed to a projecting portion 17A protruding rearward from the mounting nut 93. The other end of the operating shaft 22 extending to the side edge of the trigger 20 is fixed to a holding plate 96 loosely fitted between 95A and 95B, passing through a guide hole 97A provided at the bulging portion 97 of the gun body 2 side. To do.

The guide hole 97A is formed by a central hole of a guide cylinder 98 that is screwed into the inner hole of the bulging portion 97, and the actuating shaft 22 is held by a spring piece between the front snap ring 94 and the guide cylinder 98. It is biased forward with the plate 96.

Therefore, in this example, the nut fittings 95A, 95B and the holding plate 96 form a linking portion 25 that links the projecting portion 17A and the operating shaft 22, and the pulling of the trigger 20 causes the operating shaft 22 to move backward. The second valve shaft 17 can be retracted. Also, the linking portion 25
Can adjust the operating shaft 22 back and forth by screwing back and forth of the nut fittings 95A and 95B, and can change the backward movement distance and the backward movement timing of the second valve shaft 17 with respect to the pulling of the trigger.

Further, a nozzle pipe 99 is fitted forward in the valve cylinder 91 of the second opening / closing valve 19. The nozzle tube 99 has the inner hole 90.
The inner hole 90 extends inward and terminates in the front, and the inner hole 90 around the nozzle tube 99 is an end portion of the nozzle tube 90, which is one of the air channels 40 having one end electrically connected to the second coating agent channel 16. Form a part.
As described above, one end of the air flow path 40 is electrically connected to the second coating material flow path 16 at the front end of the nozzle tube 99 on the downstream side of the second opening / closing valve 19.

The air passage 40 is provided with an air nipple 10 provided at the lower end of the handle 43.
Air opening / closing valve 10 provided at the upper part of the handle 43 from 0 through the guide hole 101
It is electrically connected to the inner hole 90 through a hole 103 that accommodates 2 and a guide hole 105. The air opening / closing valve 102 includes a valve box 106 and a valve rod 107, and a hole 103 through which the guide hole 105 communicates with a valve seat 107A of the valve rod 107 coming into contact with or separating from a valve seat at the rear end of the valve box 106. Front chamber and guide hole
You can open and close the air passage 40 by opening and closing the rear chamber where 101 communicates,
Moreover, the push shaft portion of the valve rod 107 is projected toward the trigger 20 by the spring piece of the rear chamber.

However, the mixed spray gun 1 has the first coating nipple 44.
A well-known first feeding device 7 for feeding a first coating material such as a main agent under high pressure through the second coating material nipple 86 and a second coating material such as an auxiliary agent.
Is connected to a second feeding device 13 for low pressure feeding the coating material, and the air nipple 100 is connected to the high pressure air source AC.

Therefore, the air on-off valve 102 is first opened by the pulling operation of the trigger 20, and the high pressure air is discharged from the air passage 40 to the second coating material passage 16 on the downstream side of the second on-off valve 19 through the second discharge port 6. , The second on-off valve 19 is opened after spraying from the nozzles 6 and 6, and the liquid second coating agent flowing through the vertical hole 88 and the nozzle tube 99 is mixed with the high-pressure air flowing forward around the nozzle tube 99. Then, it is atomized and discharged from the second discharge ports 6, 6. At this time, the second coating agent does not flow into the upstream side of the tip of the nozzle pipe 99, that is, the second opening / closing valve 19 side, and prevents clogging of the air passage and the second coating passage. To help.

Further, the trigger 20 can open the first opening / closing valve 12 almost at the same time as the opening of the second opening / closing valve 19, and as a result, the first coating material flow path.
10. Through the center hole 47, the first coating material is accurately mixed with the first coating material atomized and discharged from the first discharge port 5. Further, by opening the trigger 20, it is possible to reversely operate and stop the operation. Since the atomized state has a property of liquefying by cross-collision, the first and second atomized coating agents may be mixed so that the mixing position intersects with the front surface of the article to be coated. It is preferable to appropriately set the diffusion angles of the first and second coating materials and the inward inclination angles of the second ejection ports 6 and 6.

When clogging occurs in the first discharge port 5, the hole 27, and the inflow port 26, the lever piece 75A is rotated by finger operation, and the first discharge port 5 and the inflow port of the rotary base 29 are connected. 26 and the reverse position and pull the trigger 20 to move the first coating agent through the first coating material flow path, the first discharge port 5 and the hole 27.
Discharge from 26. Since the inflow port 26 is formed to have a diameter larger than that of the first discharge port 5, the clogging material can be easily and reliably discharged to the outside together with the first coating material.

In this example, since the second coating material is supplied in a liquid state to the tip of the nozzle tube 99 by providing the air flow path 40, for example, the second coating material is mixed with air in advance and atomized, and then the pipe or the like is used. There is no liquid pool that is likely to occur due to liquefaction of the second coating agent in the feed passage, such as when feeding the gun through the feed passage,
Although it is possible to use the second coating agent and mix the first coating agent with high precision by eliminating the need for blown air, the second coating agent can be provided by high-pressure pressure feeding without providing the air passage 40. May be configured so as to be atomized and discharged in an airless manner.

〔The invention's effect〕

As described above, the first discharge port and the inflow port, which are communicated with each other by the hole, are provided at both ends, and the first discharge port or the inflow port is reversed by rotation to communicate with the first coating material flow path. By using the rotating substrate, it is possible to instantly discharge and remove the clogging at the discharge portion of the first coating agent, which is likely to occur in the spray gun that mixes the mixed type coating agent in the atomized discharge state, and the cleaning work is abolished. It is possible to improve the coating work efficiency. Further, it is possible to prevent defective products due to hardening of the coating material on the surface of the work caused by interruption of coating due to clogging, and it is possible to improve yield and improve coating quality.

[Brief description of drawings]

FIG. 1 is a side view of the present invention, FIGS. 2 (a) and 2 (b) are front views and partial plan views thereof, FIG. 3 is a sectional view thereof, and FIG. 4 is an exploded perspective view showing a nozzle fitting. FIG. 5 is a rear view showing the nozzle fitting, and FIGS. 6 to 7 are sectional views thereof. 2 ... Gun body, 3 ... Nozzle metal fitting, 5 ... First discharge port, 6 ... Second discharge port, 7 ... First feeder, 9 ... First inlet end, 10 ...... First coating fluid passage, 11 ...... First valve shaft, 12 ...... First on-off valve, 13 ...... Second feeder, 15 ...... Second inlet end, 16 ...... Second coating material flow path, 17 ... second valve shaft, 19 ... second on-off valve, 20 ... trigger, 26 ... inflow port, 27 ... hole, 29 ... rotating substrate.

Claims (1)

[Claims] 1. A first coating agent atomized and discharged from a first discharge port provided in a nozzle fitting at a front end of a gun body, and a second coating agent atomized and discharged from a second discharge port. A mixing type spray gun for mixing in an atomized state, the first coating agent communicating with the nozzle fitting from a first inlet end to which a first feeder for feeding the first coating agent is connected. A first on-off valve having a first valve shaft for opening and closing a flow path, and a second
A second valve shaft that opens and closes a second coating fluid passage communicating with the second discharge port from a second inlet end to which a second feeding device for feeding the second coating material is connected. 2 on-off valves and one end is second
An air flow path that is connected to a second coating material flow path downstream of the on-off valve and has the other end connected to a high-pressure air source, the first valve shaft and the second valve shaft. A trigger for pulling together is provided on the gun body, and the nozzle fitting is provided with the first discharge port at one end, and extends from the first discharge port and extends from the first discharge port provided at the other end. Also has a hole connecting to the large-diameter inlet port and is rotatable, and the rotation causes the first discharge port or the inlet port to be reversed to communicate with the first coating fluid passage. The second coating material flow path extends from the second opening / closing valve in the air flow path and terminates, and the end point is the air flow path being the second coating material flow path. A mixing type spray gun having a nozzle tube which is connected to the nozzle and forms one end.