JPH0716507A - Spray gun, flow rate checking and adjusting unit for spray gun, and painting apparatus - Google Patents

Abstract

PURPOSE:To check and adjust the amount of liquid supply in hand of an operator and improve operationability of a spray gun. CONSTITUTION:A means 150 to adjust and check the amount of a liquid to be supplied for painting, for example, a hardening agent having prescribed light transmittance, is installed in an introduction part of the hardening agent and the hardening agent is supplied through the means. A monitoring pipe 45 made of light transmissive resin and having a taper flow route 45F in the inside whose cross section surface area gradually increases toward upside is installed and a float 52 whose displacement reflects the flow rate of the supplied hardening agent is set in the flow route and thus the flow rate of the hardening agent can be checked by observing the position of the float 52 by eyes. A flow route 53 to introduce the introduced hardening agent into the monitoring pipe 45, a valve 55 positioned to the flow route 53, and a knob 50 to adjust the supply amount of the hardening agent by adjusting the valve position and determining the open degree of the valve are installed in the lower part.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray gun, a spray gun flow rate confirmation and adjustment unit, and a coating apparatus.

[0002]

2. Description of the Related Art A flow meter as a means for measuring the flow rate of a fluid to be transferred is widely used in various fields. Also in the field of coating, a flow meter is provided in a supply path of a paint or other liquid used for coating. It is used for work to check and set the liquid supply amount. However, in the case of a spray gun in which the operator directly grips and performs the painting work, the liquid supply amount is checked by looking at such a flow meter, or the supply amount of the liquid supply means is adjusted based on this. Even without it, it would be convenient if such a work could be done at hand, and such demands are actually increasing.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to improve the operability of a spray gun and to downsize a coating apparatus using the spray gun. Another object of the invention is a polyester system,
It is an object of the present invention to provide a preferable configuration for constructing an external mixing type spray gun or a two-component coating apparatus using a polyurethane-based or epoxy-based coating material.

[0004]

To this end, the spray gun of the present invention is provided at a portion for introducing a liquid to be coated,
A confirmation tube, which is made of a light-transmissive material and has a tapered flow path whose cross-sectional area gradually increases upward as the introduction portion, and is housed and supplied in the flow path. The float that is displaced according to the flow rate of the liquid, the valve that is positioned with respect to the liquid inlet of the flow path, and the opening of the valve that is adjusted by adjusting the position of the valve to adjust the supply amount of the liquid. It is characterized in that it comprises a flow rate confirmation adjusting means having an adjusting member. The spray gun is
A means for introducing the coating material and the curing agent and mixing them when spraying them can be provided, and the flow rate confirmation adjusting means can be provided in association with the introduction portion of the curing agent. Further, the flow rate confirmation and adjustment unit for a spray gun of the present invention is formed of a material having a light-transmitting property, and the inside thereof has a tapered flow passage whose cross-sectional area gradually increases toward the downstream in the liquid supply direction. A pipe, a float that is displaced in accordance with the flow rate of the liquid stored and supplied in the flow path, a valve that is positioned with respect to the liquid inlet portion of the flow path, and the position of the valve that is adjusted to open the valve. It is characterized in that it has a member for adjusting the supply amount of the liquid by determining the degree, and can be attached to the liquid introduction part of the spray gun. Further, the coating apparatus of the present invention is the above spray gun and a liquid supply means for supplying the liquid, and is connected to the flow rate adjustment confirmation means of the spray gun without having a means for confirming and adjusting the flow rate. The liquid supply means is provided. The coating apparatus includes means for supplying a coating material and a curing agent, and means for mixing the coating material and the curing agent when the spray gun introduces the coating material and the curing agent and sprays the coating material and the curing agent. It can be used as a curing agent supply means.

[0005]

According to the present invention, there is provided a spray gun in which an operator directly grips and performs a coating operation, and the operator can confirm the liquid supply amount at his / her hand or adjust the liquid supply amount based on the confirmation. Therefore, the operability of the spray gun can be improved, and the coating apparatus using the spray gun can be downsized. Also, when constructing an external mixing type spray gun or two-component coating device using polyester, polyurethane or epoxy paint, it is possible to easily confirm and adjust the amount of the curing agent mixed with the paint. become.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. FIG. 1 and FIG. 2 are a side view and a magnified view of a main part of a spray gun according to an embodiment of the present invention, a part of which is shown in section. In these figures, 1 is an air cap attached to the tip of the spray gun by a cap 7, and side air holes 1S for forming an elliptical injection pattern on the inner surfaces of a pair of corners projecting from this.
have. Reference numeral 2 denotes an inner cap attached to the inside of the air cap 1 at the tip of the spray gun, which is located in front of the paint nozzle 4 and concentric with the paint nozzle 4, and its air passage has a central air hole 2C near the tip of the paint nozzle 4. And the compressed air is guided to the mixing air hole 2M provided facing the injection shaft. Here, the central air hole 2C has a function of creating a vacuum state for sucking up the coating material as the main agent and the curing agent from the coating material nozzle 4, and is positioned concentrically with the tip of the coating material nozzle 4. Also, a mixing air hole 2M
Has a function of appropriately mixing the paint and the curing agent mixed in the compressed air ejected from the central air hole 2C, and in this example, the paint nozzle and the hardener are provided at a position of the tip of the paint nozzle at a position orthogonal to the ejection axis and in the ejection axis direction. Two pieces are provided facing each other in two directions spaced apart from each other. Needless to say, the disposition position, disposition direction, and disposition number of the mixing air holes 2M can be appropriately determined. The paint nozzle 4 is configured to be capable of spraying a paint as a main component and a curing agent, and has a double structure. That is, the hollow first needle valve 18 is inserted inside the paint nozzle tip opening so as to open and close the paint nozzle tip opening.
The second needle valve 12 is provided in the hollow portion of the first needle valve 18 so that the tip opening of the needle valve 18 can be opened and closed. Then, in the space between the inner wall of the paint nozzle 4 and the first needle valve, the paint as the first liquid is supplied from the paint nipple 42 side, while in the space between the inner wall of the first needle valve 18 and the second needle valve 12. Means that the hardening agent as the second liquid is introduced from the hardening agent nipple 43 side through the opening 180 provided in the first needle valve 18, and first, the relative position of the second needle valve 12 with respect to the first needle valve 18. The hardener is sprayed with the opening of the first needle valve tip opening by the manual operation, and then the paint is sprayed with the opening of the paint nozzle tip opening by the operation of the first needle valve 18. . As described above, the first needle valve 18 has a valve function for opening and closing the paint injection port, and also has a function as a nozzle for opening and closing the curing agent injection port by the second needle valve 12.

A tip body 11 houses the paint nozzle 4, the first and second needle valves 18 and 12, the air cap 1 and the inner cap 2 are attached, and the paint is supplied through the paint hose 42P. Of the hardening agent supplied through the paint nipple 42 for introducing the liquid into the gap between the inner wall of the paint nozzle 4 and the first needle valve, and the flow rate confirmation unit described later, and the inner wall of the first needle valve 18 and the second needle. A hardening agent nipple 43 for introducing into a gap with the valve 12 is attached. The tip body 11 can be attached to and detached from the spray gun main body 100 having a configuration substantially similar to that of a known spray gun main body by the cover 16, and the compression provided in the spray gun main body 100 can be performed by the attachment. The air ports 109C and 109P of the air passage 109 are communicated with the compressed air passage 111 for blowing and the compressed air passage 113 for pattern in the tip body 11, respectively. 15 is the first
A packing case that can receive the sliding movement of the needle valve 18 and that is provided between the attachment portions of the paint nipple 42 and the curing agent nipple 43 and that seals between the coating material supply path and the curing agent supply path. V-seal and O-ring are placed. Further, in relation to this packing case, a discharge passage 120 having an opening at the bottom is formed in the tip body 11, and even if a paint or a curing agent leaks in the packing case portion, the discharge passage 120 is formed. The drainage is performed so that the leaked liquid does not reach the supply path for the curing agent or paint. In addition, since the operator can visually check the state of the discharge path 120 to check the presence or absence of leakage, it is possible to easily recognize the maintenance time of the packing case or the spray gun. Further, in connection with the discharge path 120, a means for preventing the dripping of the leaked liquid or a means for facilitating the confirmation of the presence or absence of the leak may be provided.

A stopper 19 is provided at the rear end of the first needle valve 18 so as to be able to receive the sliding movement of the second needle valve 12 and engage with the step portion 12S provided on the second needle valve 12. is there. Reference numeral 20 is a spring for urging the first needle valve 18 in the direction of closing the paint outlet, and the spray gun body 1
00 and the stopper 19. Reference numeral 21 is a rod connected to the second needle valve 12 and extends to the rear of the spray gun. Reference numeral 28 denotes a spring receiver further connected to the rod 21, and receives a spring 34 for urging the rod 21 or the second needle valve 12 in the direction of closing the hardener outlet. Reference numeral 33 is a paint adjusting knob, which is the second needle valve 1 after the step portion 12S and the stopper 19 are engaged.
It is used to regulate the amount of paint to be sprayed by regulating the amount of displacement of the first needle valve 18 with respect to the paint nozzle 4 by regulating the displacement amount of 2. In the air nipple provided at the lower end of the grip of the spray gun body 100,
An air hose connected to a compressed air supply source (not shown) such as a compressor is attached, and the compressed air introduced into the air nipple is compressed air passages 101, 103, 105 in the main body.
And 107 to the air passage 109. 37
Is an air valve that can open and close the air passage 105, 38 is a seat portion of the air valve, and 36 is an air valve 37.
5 is a spring that urges in the closing direction of 5. Reference numeral 40 denotes an air amount adjusting device, which includes a valve body 40V positioned with respect to the air passage 103, and a knob 40T for adjusting the compressed air supply amount by adjusting the position of the valve body 40V to determine the opening degree. have. Further, in the air passage 109, a valve body 29V positioned with respect to the air passage outlet 109P communicating with the spray pattern adjusting air passage 113,
Knob 2 for adjusting the pattern compressed air supply amount by adjusting the position of valve body 29V and determining the opening degree
A pattern adjusting device 29 having 9T is provided.

Reference numeral 130 is a trigger attached to a rotary shaft 131 on the upper part of the main body, which engages with an operating rod 37R of the air valve 37, and a rod of the paint valve mechanism in the middle of the engaging position and the rotary shaft. It is connected to 21. Then, along with the operation, the air valve 37 is opened against the biasing force of the spring 36, and the second needle valve 12 to the first needle valve 18 are operated against the biasing force of the spring 34 or the spring 20. . In this example, a means 150 for adjusting and confirming the amount of the curing agent is attached to the curing agent nipple 43, and the curing agent is supplied through the means 150. Reference numeral 45 denotes a flow rate confirmation tube attached to the curing agent nipple 43, which is transparent or semitransparent, that is, made of resin or the like having a predetermined light transmittance. A tapered channel 45F having a cross-sectional area gradually increasing upward is formed therein,
A float 52 that is displaced according to the flow rate of the curing agent supplied is housed in the flow path. Further, a scale 45S is provided on the outer wall of the confirmation tube 45, and the flow rate of the curing agent can be confirmed by visually observing the scale position of the float 52. Also, the confirmation tube 45
An indicator ring 46 is attached to the outer wall of S so as to be displaceable along the outer wall, and by setting the desired flow rate position, the deviation of the float position from that position can be confirmed to adjust the flow rate. You can The scale 45S may be drawn or engraved on the outer wall of the confirmation tube 45, or may be an uneven portion formed at the same time when the confirmation tube 45 is molded. In this case, it can also be used as a locking portion of the indicator ring 46. At the bottom of the confirmation tube 45, a tube portion 51 to which a curing agent hose is attached and which introduces the curing agent supplied from the hose, and a confirmation tube 45 which confirms the introduced curing agent
Flow path 53, a valve 55 positioned with respect to the flow path 53, and a knob 50 for adjusting the supply amount of the curing agent by adjusting the position of the valve body 55 to determine its opening. A flow rate controller is provided. Also. The tube portion 51 is supported by a stay 56 attached to the gun gripping portion to reinforce the attachment.

In the above construction, the operator makes the tip of the gun face the object to be coated in order to perform the desired coating, and the trigger 130
Is operated, the air valve 37 is opened against the urging force of the spring 36, and the second needle valve 12 to the first needle valve 18 are retracted against the urging force of the spring 34 to the spring 20 to paint and cure. Although the agent is injected, the air valve rod engaging portion is rotated by the rotary shaft 13 from the rod coupling portion of the paint valve mechanism.
Since the position is far from 1, the displacement amount is large and only compressed air is first injected at the beginning of the operation, and then the second needle valve 12 is retracted with respect to the first needle valve 18 to open the hardener outlet. , The curing agent spouts. The trigger 130 is further squeezed, and the second needle valve 12 is moved to the first needle valve 1
When it is further retracted with respect to 8, the second needle valve 12
The step portion 12S of the first needle valve engages with the step portion 12S of the first needle valve.
The needle valve 18 retracts with respect to the paint nozzle, the paint outlet is opened, and the paint is also sprayed. At this time,
Since compressed air having the same pressure as the blowing central air hole 2 is applied from the mixing air hole 2M in two directions that intersect with the injection axis and do not intersect with each other, the paint and the curing agent mixed in the jet stream are atomized. , Mixed properly and painted. On the other hand, when the operator releases the operation of the trigger 130, the air valve 37 is closed by the urging force of the spring 36, and the second needle valve 12 or the first needle valve 18 is opened by the urging force of the spring 34 or the spring 20. The injection of the paint and the curing agent is stopped by moving forward, but in the initial stage, the first needle valve 18 is integrated with the second needle valve 12 and moves forward with respect to the paint nozzle, and the paint outlet is first closed to prevent the paint. Injection is stopped. After the second needle valve 18 reaches the closed position of the paint outlet, the second needle valve 12 advances with respect to the first needle valve 18 to close the hardener outlet, and the air valve is further urged by the spring 36. 37 will be blocked. As described above, in this example, the curing agent is sprayed prior to the coating material at the start of coating and the spraying of the coating material is stopped prior to the curing agent at the end of coating, so that only the coating material is not sprayed onto the object to be coated.

Further, when the flow of the curing agent occurs with the injection of the curing agent, the force exerted on the float 52 by the fluid (curing agent) flowing in the confirmation pipe flow passage 45F whose cross-sectional area gradually increases upward and the float 52. Since the float 52 substantially stops at the position where the gravity acting on the
The amount of the curing agent can be confirmed by visually observing the float 52 through the tube wall. FIG. 3 shows an example of the configuration of a two-component coating apparatus constructed by using the above spray gun. Reference numeral 200 denotes a spray gun which is shown in its entirety in FIG. 1, and is attached to an air hose 170H attached to an air nipple 170 provided in a compressed air introduction portion of an air passage formed in a gun grip portion and a paint nipple 42. The compressed air supply source 300 including an air compressor and the paint through the hardened material hose 51H attached to the hardened material nipple 51 provided in the pipe portion 51 of the paint hose 42H and the hardener amount adjustment confirmation means 150, respectively. It is connected to a paint supply source 400 as a first liquid supply means including a container, a paint tank and the like, and a pressure tank type curing agent supply source 500 as a second liquid supply means. Here, since the amount of the main component paint to be supplied is large and its viscosity is also high, the paint supply source 400 in this embodiment is used.
Include, for example, DPS-90 manufactured by Iwata Paint Co., Ltd.
A paint pump such as X can be used. For example, the paint hose 42H is connected to an air pump that operates by receiving compressed air from the compressed air supply source 300, a member that is connected to a hose that sucks up the paint stored in the paint container according to the operation, and the paint hose 42H. And a necessary adjusting means such as a pressure reducing valve. In addition, in the present embodiment, the paint generally does not have optical transparency, and the flow rate confirmation tube 45
The paint hose 42H is not directly compatible with the gun 200
Therefore, a known flow meter 410 is attached to the paint pressure feed path to the gun 200 to adjust the paint supply amount. However, if a paint having a light transmissive property such that the float 52 can be confirmed through the tube wall of the flow rate confirmation tube 45 as described above is used,
The flow meter 410 and the like described below can be omitted. On the other hand, since the amount of the curing agent to be supplied to the paint is small and the viscosity thereof is low, the curing agent supply source 500 in this embodiment is, for example, PT series manufactured by Iwata Coating Machine Industry Co., Ltd. It is possible to use a pressure tank that pressurizes the inside of the container according to the introduction of the compressed air and thereby pressure-feeds the stored liquid. Alternatively, a combination of a curing agent container and a diaphragm pump may be used. Further, in the present embodiment, since the curing agent applied to the polyurethane-based or epoxy-based coating material or the like generally has a light-transmitting property, it is easily adapted to the flow rate confirmation tube 45, and a curing agent amount adjusting means is provided. Since it is attached to the gun 200 itself, there is no need to provide a flow meter or adjusting means in association with the hardener source 500.

According to the above embodiment, since the two liquids are properly mixed at the tip of the spray gun,
Even when using polyurethane-based or epoxy-based paint, problems such as incomplete curing do not occur,
Therefore, after mixing with a mechanical stirrer, the mixture is supplied to a spray gun, or a static mixer or the like is provided in the supply path to the spray gun, etc., to perform mixing in the process of supplying paint. By eliminating such a configuration, the two-component coating device can be made compact and inexpensive. Further, it is possible to easily and promptly deal with the change of the paint such as the color change. Furthermore, on the supply side of the coating agent to the spray gun,
As shown in FIG. 3, it is sufficient to substantially dispose only the paint supply source 400 and the curing agent supply source 500, and they occupy a small space. Therefore, they are housed in a common housing or the like.
Alternatively, they can be mounted on a common trolley, in which case the workability of painting can be further improved. Further, since the paint to which the curing agent is added cures in a comparatively short time, conventionally, at the time of resuming after the work is stopped, it is necessary to discard and wash the paint at least in the paint supply passage downstream from the mixing section. Therefore, waste of paint and complicated work are required, and since thinner of organic solvent is used for cleaning,
Although it was impossible to effectively reduce the amount of organic solvent used,
In this embodiment, such a problem does not occur. Further, in this embodiment, the gun main body 100 itself has a structure substantially similar to that of a known spray gun main body portion, so that a required portion such as the intermediate body 11 is attached to the tip end portion of the external mixing type. It is easy to construct a spray gun for two-component coating, and such a form is also included in the scope of the present invention. Further, as is apparent from FIG. 1, since the flow rate confirmation adjusting means 150 of the present embodiment is in the form of a unit that can be attached to and detached from the nipple on the gun side, it can be attached and detached as necessary, or as desired. It can also be installed later. In addition, the above is an example in which the light transmittance of the curing agent is used to facilitate confirmation or adjustment of the flow rate when externally mixed two-component coating is performed using a polyester-based, polyurethane-based, or epoxy-based coating material. However, the form of the gun to which the present invention is applied is not limited to the above-mentioned configuration, and it goes without saying that it can be effectively applied to various forms of the gun as long as a liquid having a required light transmittance is used. Is. That is, in the flow rate confirmation adjusting means as described above, the liquid to be ejected is 1
Whether it is a liquid or two or more liquids, it can be provided in association with a liquid having a required light transmittance.

[0013]

As described above, according to the present invention,
In a spray gun in a form where the operator directly grips and paints, check the liquid supply amount at the operator's hand,
Or, since the liquid supply amount can be adjusted based on this, it is possible to improve the operability of the spray gun and to downsize the coating apparatus using the spray gun. Also, when constructing an external mixing type spray gun or two-component coating device using polyester, polyurethane or epoxy paint, it is possible to easily confirm and adjust the amount of the curing agent mixed with the paint. become.

[0014]

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of a spray gun of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a schematic diagram showing a configuration example of a two-liquid coating apparatus configured using the spray gun of FIG.

[Explanation of symbols]

1 Air Cap 2 Inner Cap 2C Center Air Hole 2M Mixing Air Hole 4 Paint Nozzle 7,16 Cover 12 Second Needle Valve 15 Packing Case 18 First Needle Valve 19 Stopper 20, 34, 36 Spring 21 Rod 29 Pattern Adjuster 33 Paint control knob 37 Air valve 40 Air amount control device 41 Air nipple 42 Paint nipple 43 Curing agent nipple 45 Flow rate confirmation tube 45F Flow path 45S Scale 46 Indication ring 50 Flow rate control knob 55 Valve 100 Spray gun body 101, 103, 105, 107, 109, 111, 1
13 air passage 120 discharge passage 130 trigger 150 flow rate confirmation adjusting means

Claims (5)

[Claims] 1. A taper shape which is provided at an introduction portion of a liquid to be used for coating and is made of a material having a light-transmitting property, and has a cross-sectional area gradually increasing upward as the introduction portion. A confirmation tube in which a flow path is formed, a float that is displaced in accordance with the flow rate of the liquid stored and supplied in the flow path, a valve positioned with respect to the liquid inlet portion of the flow path, and a valve of the valve. A spray gun comprising: a flow rate confirmation adjusting means having a member for adjusting the position to determine the opening degree and adjusting the supply amount of the liquid. 2. A means for introducing a coating material and a curing agent and mixing them when they are jetted, and the flow rate confirmation adjusting means is provided in association with the introduction portion of the curing agent. The spray gun according to claim 1. 3. A confirmation tube formed of a material having a light-transmitting property and having a tapered flow path formed therein, the cross-sectional area of which gradually increases toward the downstream in the liquid supply direction, and a confirmation tube in the flow path. A float that is displaced according to the flow rate of the liquid that is stored and supplied, a valve that is positioned with respect to the liquid inlet of the flow path, and a valve that is positioned by adjusting the position of the valve to determine the opening degree of the liquid. A flow rate confirmation and adjustment unit for a spray gun, which has a member for adjusting a supply amount and can be attached to a liquid introduction portion of the spray gun. 4. The spray gun according to claim 1, and a liquid supply means for supplying the liquid, which is connected to the flow rate adjustment confirmation means of the spray gun without a flow rate confirmation and adjustment means. A coating apparatus comprising: the liquid supply means. 5. A means for supplying paint and a curing agent is provided, and a means for mixing the paint and the curing agent when the spray gun introduces and sprays the paint and the curing agent is provided. The coating device according to claim 4, wherein the coating device is a means for supplying a curing agent. [0001]