JPH0628754B2 - Application gun - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention enables a trigger to be flipped up, thereby enabling an operating section for turning on and off an operation valve for delivering a coating agent to be operated independently. , For coating guns that can improve usability.

[Conventional technology]

In a spray gun that atomizes and sprays the coating material with high-pressure air, a small amount of the trigger opens the air channel to discharge high-pressure air in advance and further trigger operation to open the coating channel. It is formed as if the coating material is atomized and ejected, whereby only the high-pressure air is ejected in advance to remove foreign matters and the like on the coated surface, and in this way, by ejecting the high-pressure air over time,
Prevents dripping of the paint.

However, when cleaning the painted surface only by blowing high pressure air, due to an error in the trigger operation,
Occasionally, the coating material may also be ejected to rather stain the surrounding area.

On the other hand, in recent years, multi-liquid mixed type coating agents such as polyester resins and epoxy resins have been frequently used as paints and adhesives.
Such a multi-liquid type coating agent is disclosed in, for example, Jitsuko Sho 60-
As disclosed in Japanese Patent No. 36377 and Japanese Utility Model Laid-Open No. 58-40254, the coating agent is mixed in advance with a mixer separately provided from the coating gun and then supplied to the coating gun. As a result, the size of the apparatus becomes large, and the coating material remaining after the work has to be washed between the mixer and the coating gun, resulting in waste of the coating material and a large scale of the apparatus. Therefore, it has been devised to provide a pump in each coating material flow path in the gun body in order to mix the coating material and improve the mixing ratio accuracy. Also, this pump is driven by a rotating machine in the coating gun, and the pump is
It comprises a movable member for delivering the coating material. However, in this coating gun, since the pump has the movable member, it is necessary to surely clean the coating material flow path including the pump after the work is completed. Therefore, the present inventors have created a cleaning liquid flow channel in the gun body in advance and sending the cleaning liquid flowing through the cleaning liquid flow channel to the coating material flow channel. Such delivery of the cleaning liquid uses the rotary machine for driving the pump as an operation source, and therefore, for cleaning, only the rotary machine is closed while closing the coating material on-off valve attached to the coating material passage. It is necessary to operate. When the coating material on-off valve is opened by mistake, the coating material flows back through the coating material on-off valve to the upstream side of the coating material flow path. Therefore, in order to prevent such backflow, the operation source is turned on and off. It was found that it is desirable to be able to operate only the operation part of.

As described above, the present invention can operate both the coating material on-off valve for opening and closing the coating material flow path and the operating on-off valve for turning on and off the operation source for delivering the coating material, and only the operating portion can be finger-operated by the flipping. It is an object of the present invention to provide an application gun that can achieve the above object by forming an operable space.

[Means for Solving the Problems]

According to the present invention, a gun main body is opened and closed by a paint opening / closing valve having one end communicating with a coating material supply device and the other end communicating with a discharge port of the gun main body and having a valve shaft protruding outside the gun main body. An operating opening / closing valve having a coating material flow path, an operation source for opening and closing an operation source for delivering the coating material in the coating material flow path, and an operating portion operable outside of the gun body by fingers, and the gun body. It is pivotally supported so that it can be flipped up and comes into contact with the valve shaft and the operating part by pulling to operate both of them, and by the flipping up, it is separated from the valve shaft and the operating part and the operating part can be operated by fingers. The coating gun is provided with a trigger capable of forming a space to be formed.

[Action]

By the trigger operation, it is possible to simultaneously operate the coating material opening / closing valve that opens and closes the coating material flow path and the operating portion of the operating opening / closing valve that opens and closes the operation source for sending the coating material in the coating material flow path. Further, since a space can be formed in front of the operating portion by flipping up the trigger, only the operating portion can be operated independently by fingers. For example, in the case of a spray gun, high pressure air is used, or a mixture of a plurality of liquids is applied. In the case of the coating material on-off valve using, the usability of the coating gun is improved by, for example, sending only the cleaning liquid into the coating material flow path.

〔Example〕

Hereinafter, the case where the coating gun 1 of the present invention is formed as a coating gun for continuously coating while mixing a two-liquid mixing type coating agent will be described with reference to the drawings.

In the figure, an application gun 1 includes two coating material flow paths 6, 6 which are opened and closed by a coating material opening / closing valve 5 having one end communicating with a discharge port 4 of the gun body 3 and having a valve shaft 14. Operation unit 1 for turning on / off the operation source Q for delivering the coating material in the agent flow path 6
An actuating part opening / closing valve 10 including 2 and the valve shaft 1 by traction
And a trigger 15 capable of abutting against the operation portion 12 and the operation portion 12 and moving the both together and separating from the valve shaft 14 and the operation portion 12 by flipping up and forming a space in which the operation portion 12 can be operated by fingers. Further, a mixer 2 for mixing the coating material discharged from each discharge port 4 is attached to the front surface of the gun body 3.

The actuation source Q is a pump in this example, and is a pump body P interposed in the coating material flow path 6 and delivering the coating material in the flow path 6,
Rotating machine M that attaches to the gun body 3 and drives the pump body P
Formed from. Further, the rotary machine M is a fluid motor that is rotated by a fluid such as high-pressure air in this example, and the gun main body 3 has an operating opening / closing valve 1 for turning on / off the operation of the rotary machine M.
And a working fluid passage 11 for feeding high-pressure air are arranged in parallel, while a washing fluid passage 9 capable of feeding a washing fluid for washing the coating material and opened / closed by a washing fluid opening / closing valve 7 is the coating fluid It communicates with the agent flow path 6. The coating gun 1 is, in this example,
It has a symmetrical shape centering on a vertical section including its center, the air flow passage 11 is arranged on a symmetry plane, and the coating flow passage 6,
6 and the cleaning liquid flow paths 9 and 9 are bilaterally symmetrical, the following description will be given using one of the left and right flow paths 6 and 9, if necessary.

The gun body 3 includes a lower base member 23 in which a mounting portion 22 is bulged on an upper end of a handle 21, an upper base member 24 bolted to an upper surface of the lower base member 23, and a bracket 25 bolted to a front surface of the upper base member 24. And a pump case 26, which is bolted to both side surfaces of the upper base 24 and houses the pump P, and the rotating machine M is fixed to the rear surface of the upper base 24.

As shown in FIG. 6 in which the upper base member 24 is divided along the plane of symmetry, the upper base member 24 is formed by cutting out the front surface and the upper surface of the rectangular parallelepiped base portion 27.
By forming A, side wall portions 27C and 27C and a rear wall portion 27D that are continuous in a U shape are formed on both side edges and the rear edge of the thick bottom plate portion 27B.

Further, the rotating machine M straddles the bottom plate portion 27B and the rear wall portion 27D and is screwed into a recess provided on the rear surface of the symmetry plane, and its output shaft MS has an upper surface of the bottom wall portion 27B. Is notched and protrudes into the recess 27E that opens at the recess 27A, and its tip is pivotally supported by a bearing provided on the front wall of the recess 27E. A worm W, which is a transmission mechanism in this example, is screwed to the output shaft MS, and the worm W is attached to the rotary shaft 28 pivotally supported by the side wall portions 27C and 27C and is provided in the recess 27A. Engage with the worm wheel WH located.

As shown in FIG. 3, the working flow passage 11 for driving the rotating machine M has upper and lower holes 29 and 30 extending in front and rear and in parallel on the plane of symmetry of the mounting portion 22, and also below. Hole 30
The operation opening / closing valve 10 is provided at the front end of the. The actuating on-off valve 10 has a valve shaft 32 extending from a valve 31 that comes into contact with and separates from a valve seat of a valve box, and projects toward the front of the mounting portion 22 and has its tip located outside the gun body 3 and operated by fingers. A push button-like operation unit 12 is provided. The actuation on-off valve 10 is operated by pushing and pulling the operation portion 12 so that the valve 31
By moving the hole 30 and the oblique hole 34 that communicates with the periphery of the valve box of the actuating on-off valve 10, the actuating on-off valve 10 moves from the hole 30 to the oblique hole 3.
4. Open the air flow path 11 reaching the hole 29 and communicating with the rotating machine M through the hose. Further, by releasing the operating portion 12, the air flow path 11 is closed, and thus the operation opening / closing valve 10 turns on / off the rotary machine M forming the operation source Q for delivering the coating material. At the rear end of the hole 30, a connecting fitting 35 for connecting to a high pressure air source such as a compressor is attached.

As shown in FIG. 1, FIG. 3, and FIG. 4, the coating material flow path 6 includes a connecting fitting 36 for connecting one end to a coating material supply device (not shown) via a hose. Further, as shown in FIG. 4, the coating material flow path 6 includes a hole portion 37 in which the connection fitting 36 is provided,
A hole 37 and a small-diameter hole 39 extending upward at a right angle are provided, which are shown by the alternate long and short dash line in the figure and shown in the lower part of FIG.
The hole 39 is continuous with the hole 40 of the upper base 24.

The hole portion 40 extends from the lower surface of the bottom plate portion 27B upward to the side wall portions 27C and 27C, and the hole portion 40 extends to the side wall portion 27B.
It is connected to a lateral hole 47 communicating with a pump chamber 46 formed in the pump case 26 attached to each outer surface of C.

In the pump chamber 46, the pump members G1 and G2 of the pump body P are provided.
Is stored. In this example, the pump body P is the pump member G.
A rotary pump, which is a gear pump using gears as 1 and G2, is formed. As the rotary pump, a trochoid pump, a vane pump using one disc body, a screw pump or the like can be used in addition to the gear pump.

One of the pump members G1 and G1 is detachably screwed to the rotary shaft 28. The outer periphery of the other pump member G2 is guided by the inner surface of the pump chamber 46 and is driven. Further, the pump case 26 is pump-coupled to the upper base 24 as described above, so that the pump P can be easily replaced by removing the pump case 26. At the time of replacement, the discharge amount of the pump body P can be changed by using pump members G1 and G2 having different pitch radii and different modules and changing the width dimension, and the pump members G1 of the left and right pump bodies P can be changed. By being attached to the same rotary shaft 28, the correct ratio of the coating material can be always delivered.

The lateral hole 47 forms a suction port in the pump chamber 46, and the side wall portion 27C is provided with a lateral hole 50 serving as a discharge port of the pump chamber 46. The lateral hole 50 is formed on the front surface of the side wall portion 27C. The hole 51 communicates with a hole 52 provided on the rear surface of the bracket 25 while communicating with the hole 51 that opens.

In the bracket 25, a protrusion 55 to which the mixer 2 is attached is formed on the inner surface of a square base portion 53, and the hole portion 52 is provided with the protrusion 5 through an inwardly extending hole portion 56.
5 is connected to a small hole 57 communicating with the discharge port 4 at the tip. Therefore, the coating material flow path 6 is
The other end communicates with the discharge port 4 through the holes 37, 39, 40, the lateral hole 47, the pump chamber 46, the lateral hole 50, the holes 51, 52, 56, and the small hole 57, while the coating fluid passage 6 is provided. Is opened and closed by the coating material opening / closing valve 5 provided in the hole 37.

As shown in FIG. 4, the coating material opening / closing valve 5 includes an inner surface of the mounting portion 22 of the lower base body 23 that forms the gun body 3 in a valve 59 that contacts and separates from a valve seat of a valve box screwed into the hole portion 37. A valve stem 14 is airtightly projecting from the valve stem. Therefore, by pushing and pulling the valve shaft 14 against the spring on the back surface of the valve 59, the large diameter portion of the back portion of the hole portion 37 and the tip thereof and the small diameter portion communicating with the hole portion 39 can be electrically connected and closed by releasing. Thus, the coating material flow path 6 is divided into an upstream portion 6A between the coating material on-off valve 5 and the connecting fitting 36 and a downstream portion 6B between the discharge port 4. The connection fitting 36 is connected to a coating material supply device (not shown) via a hose.

As shown in FIGS. 1 and 4, the cleaning liquid flow path 9 has a hole through which one end communicates with a cleaning liquid supply device (not shown) and a connection fitting 62 provided on the rear surface of the mounting portion 22 is screwed. 63
And a hole 64 that intersects the hole 63 at a right angle. The inner end of the hole 64, that is, the other end of the cleaning liquid flow path 9 is the downstream portion 6B of the coating flow path 6 and the opening / closing of the coating material. It communicates with the vicinity of the valve 5.

Further, the hole portion 64 has a step having a small diameter in the inner depth thereof, and the hole 64 is opened and closed by screwing it in and out of the step to open and close the cleaning liquid passage 9. Is provided.

The cleaning liquid on-off valve 7 has a screw type valve shaft, and instead of the operation on-off valve 10 and the paint on-off valve 5 described above, the one operated by a push button or a trigger, or the opening. It is also possible to use a device provided with an appropriate locking means for locking in a state.

The mixer 2 has an appropriate agitator 7 for mixing the coating material inside a cylindrical body 71 having a tapered portion at the front end.
2 is provided, and the mixer 2 can be detachably attached to the protrusion 55 of the bracket 25.

Further, the valve shafts 14 and 14 of the coating material on-off valve 5 and the operating portion 12 of the air on-off valve 10 can be flipped up by the trigger 1
5 can be used.

The trigger 15 is a protrusion 23 provided at the front end of the lower substrate 23.
The front edges of the arm pieces 73, 73 attached to both sides of A and extending downward beyond the operating portion 12 are connected by a joint piece 74 below the height position of the operating portion 12. The pieces 73, 73 can press the valve shaft 14 of the coating material on-off valve 5 and the joint piece 74 can push and pull the operation portion 12 to operate. At the front end of the protrusion 23A that pivotally supports the trigger 15, in this embodiment, a side surface thereof is biased outward by a spring and a part thereof is provided, as schematically shown in FIGS. The ball 75 protruding from the side surface and the trigger 1 that is locked to the ball 75 when the trigger 15 is flipped up.
The trigger 15 can be held in the flipped-up state by providing the locking tool 16 composed of the recessed portion 76 provided in 5. Therefore, since the front portion of the operating portion 12 can be held in an open state, the operating portion 12 can be freely operated by fingers, and only the working flow passage 11 can be freely opened and closed.

It should be noted that, instead of such a locking tool 16, for example, it may be formed by using a screw or the like provided on the trigger 15 and abutting the protruding portion 23A in the flipped-up state, or a spring piece locked in the flipped-up state. Using the locking tool 1
6 can also be formed.

However, one end of the coating material flow path 6 is connected to a coating material supply device (not shown) via a hose that engages with the connection fitting 36. As the coating material supply device, in addition to the one that pumps the coating material under pressure, a device that does not have a pumping device or a device that has a small pressure feeding pressure can be used. Also the working flow path 11
A high-pressure air source (not shown) such as a compressor is connected to the connecting fitting 35. Further, the cleaning liquid flow path 9 is connected to a cleaning liquid supply device (not shown) by a connection fitting 62. As the cleaning liquid supply device, in addition to a pressure-feeding type, a device with low pressure-feeding pressure and a device that does not pressure-feed can be used.

Next, the trigger 15 is operated. By operating the trigger 15, the valve shaft 14 of the coating material opening / closing valve 5 and the operating portion 12 of the actuation opening / closing valve 10 are pulled. As a result, the high-pressure air from the high-pressure air source flows into the rotary machine M through the working flow path 11, and the rotary machine M
To rotate. Therefore, the rotary shaft 28 is driven via the worm W and the worm wheel WH of the output shaft MS to rotate the pump bodies P on both sides of the rotary shaft 28. At the same time, the coating material flow path 6 is opened so that the coating material from the coating material supply device flows into the pump chamber 46 from the lateral hole 47 and is discharged from the lateral hole 50 as the pump body P rotates. By this, the discharge ports 4 and 4 are fed into the mixer 2. In addition, the pump member G1 of each pump body P is attached to the same rotary shaft 28 and rotates the same, so that two coating agents are
The mixture is fed into the mixer 2 at a constant ratio, and the mixture is discharged from the tip thereof while being mixed by the mixer 2.

At the end of the work, the cleaning liquid opening / closing valve 7 is opened and the trigger 15 is flipped up.
By holding the flip-up state by 6, the front of the operation portion 12 of the operation opening / closing valve 10 can be opened and only the operation portion 12 can be operated by fingers. As a result, high-pressure air is sent to the rotary machine M to drive the pump bodies P, P. The coating material on-off valve 5 is closed, so that the cleaning liquid flowing in the cleaning liquid flow 9 is sent to the coating material flow path 6 in the vicinity of the coating material opening / closing valve 5. Further, the cleaning liquid flows through the downstream portion 6B of the coating material flow path 6 and flows into the mixer 2 through the discharge port. As a result, the next work is facilitated by cleaning the downstream portion 6B such as the pump body P together with the mixer 2.

In addition, in the coating gun 1 of the present invention, as the rotating machine M,
An electric motor can be used, and in that case, a switch for turning the electric motor on and off can be used as the operation on-off valve instead of the operation on-off valve 10. The coating gun 1 can also be formed as a spray gun that atomizes and sprays the mixed coating material. At this time, an appropriate air flow path can be branched from the working flow path 11 and the mixed coating material can be formed by atomizing and spraying. In addition, a large number of coating fluid passages are provided and pump bodies P are provided for each.
By interposing, it is possible to discharge while mixing a larger number of coating materials. Further, the application gun 1 can be variously modified such that high pressure air is used as the operation source Q and the high pressure air is ejected to atomize and eject the coating material in the coating material flow path. .

〔The invention's effect〕

As described above, the coating gun of the present invention includes a valve shaft of a coating material opening / closing valve that opens and closes the coating material flow path by towing, and an operating portion of an operating opening / closing valve that opens and closes an operation source for sending the coating material in the coating material flow path. While operating together with, since it is equipped with a trigger that can be separated from the operating portion by flipping up and form a space in which the operating portion can be operated by fingers, only the operating portion can be reliably operated independently. For example, in the case of an air spray gun whose operation source is high-pressure air, only high-pressure air can be sprayed without erroneous operation, which is convenient for cleaning the painted surface. Further, in the case of the coating gun using the multiple liquid mixture type coating agent as disclosed in the present embodiment, it is possible to enhance the usability such that only the cleaning liquid can be sent to the coating agent flow path.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a front view showing a part of it in section, and FIG. 3 is a cross-sectional view of a part of FIG. FIG. 4 is a sectional view illustrating a coating material on-off valve and a cleaning liquid flow path, FIG. 5 is a sectional view showing a part of the coating material flow path, and FIG. 6 is an exploded perspective view. 2 ... Mixer, 3 ... Gun body, 4 ... Discharge port, 5 ... Coating material opening / closing valve, 6 ... Coating material flow path, 7 ... Cleaning solution opening / closing valve, 9 ... Cleaning solution flow path, 10 ... ... Actuating on-off valve, 11 ... Air flow path, 12 ... Operating part, 14 ... Valve shaft, 15 ... Trigger, M ... Rotating machine, MS ... Output shaft, P ... Pump body, Q ... … Source of actuation.

Claims (3)

[Claims] 1. A gun body is opened and closed by a paint opening / closing valve having one end communicating with a coating material supply device and the other end communicating with a discharge port of the gun body and having a valve shaft protruding outside the gun body. An opening / closing valve having a coating material flow path, an operation source for turning on and off the coating material in the coating material flow path, and an operating section operable by fingers to the outside of the gun body; It is pivotally supported so that it can be flipped up on the main body and comes into contact with the valve shaft and the operating part by pulling to operate both together, and by flipping up the valve shaft and the operating part are separated from each other and the operating part can be operated by fingers. A coating gun that is provided with a trigger that can form a space to be used. 2. The coating gun according to claim 1, wherein the actuating source is a pump which is interposed in the coating material flow passage and delivers the coating material in the coating material flow passage. 3. The coating gun according to claim 1, wherein the actuation source is high-pressure air for delivering the coating material by atomizing and ejecting the coating material in the coating material flow path.