JPS627407Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a paint supply device that supplies a fixed amount of powder paint to a coating machine (gun).

Conventionally, the powder coating was supplied to the ejector integrated with the hopper at the bottom of the hopper, instead of flowing with air, it was supplied by a stirrer or vibration installed inside the hopper, and this ejector supplied a fixed amount to the gun. In the feeding device, the ejector and the inside of the hopper are always in communication, which causes the following problems.

Even when the paint supply to the paint sprayer is stopped, the paint in the hopper enters the ejector, so an abnormally larger amount than the normal supply amount is supplied to the paint sprayer at the beginning of discharge, resulting in so-called pulsation, which can cause surface defects and paint loss. was occurring.

If pressure loss is high in the paint tube that connects the ejector and the paint sprayer because the tube is long or has a small diameter, some of the cleaning air may It sometimes flowed back into the hopper, impeding the cleaning effect. If the cleaning effect is significantly inhibited, the powder paint remaining in the tube at the beginning of discharge will be supplied at the same time as described above, and an abnormally larger amount than the normal supply amount will be supplied to the coating machine, causing the coated surface to deteriorate. A defect had occurred.

This invention is intended to solve the above-mentioned drawbacks, and by closing the paint passage between the hopper and the ejector when powder paint is not being supplied to the coating machine, paint will not enter the ejector from the hopper except when the paint is being supplied. The object of the present invention is to provide a powder paint supply device that can prevent this from occurring and at the same time prevent the cleaning effect from decreasing due to backflow of cleaning air.

That is, the powder coating supply device of the present invention includes a pinch valve in the coating passage between the hopper and the ejector, opens the pinch valve only when powder coating is being supplied, and communicates the hopper with the ejector, and at other times. The feature is that the pinch valve is closed to block the paint passage.

Hereinafter, the device of the present invention will be explained in more detail using the drawings.

FIG. 1a shows a supplying device for the paint of the present invention.
A is a sectional view taken along the line a, and b is a sectional view taken along the line b-b of a.

In the figure, 1b is a hopper pyramid, and 2 is a plate-shaped mounting member connected to the lower end outlet of the hopper pyramid 1b by welding.

The mounting member 2 has a paint passage hole 2a having the same diameter as the discharge port of the hopper pyramid portion 1b, and threaded holes (screw holes) 2b, 2b, . . . , which are opened at predetermined positions.

Reference numeral 4 denotes a box-shaped body for the interior of the pinch valve that is connected to the lower surface of the mounting member 2, and the end surface that opens on the upper surface of the body 4 is circular and has the same diameter as the paint passage hole 2a provided in the mounting member 2, and is directed downward. A paint passage 4a having a tapered shape and a cylindrical space (pinch valve interior space) 4b connected to the lower end of the paint passage 4a and penetrating to the lower surface of the body 4 are arranged in series in the height direction of the body 4. ing.

The body 4 is provided with an air passage 4c having one end open to the body side wall and the other end opening to the interior space 4b. 4d is a groove for attaching an O-ring provided on the upper surface of the body 4; 4e;
Reference numeral 4e denotes a hole for attaching a screw that penetrates in the height direction and is provided at a predetermined location on the body main body.

The pinch valve 5 includes flanges 5b extending outward at both longitudinal ends of the substantially cylindrical main body 5a.
5c, the length of the side peripheral wall thereof is slightly shorter than the height of the interior space 4b, and the outer diameter of the flanges 5b, 5c is the same diameter as the inner peripheral surface of the interior space 4b. shall be.

The sleeve 6 has flanges 6b and 6c extending inward at both longitudinal ends of the substantially cylindrical main body 6a.
The length of the side wall is the same as the length of the side wall between the flanges 5b and 5c of the pinch valve 5, and the outer diameter of the sleeve 6 is the same as the length of the side wall of the pinch valve 5. The shape has the same diameter as the outer diameter of the flanges 5b and 5c of the pinch valve 5. This sleeve 6 has one flange 5b of the pinch valve 5 and one flange 6 of the sleeve 6.
b, and the other flange 5c and the other flange 6c are engaged with each other to form an appropriate space between the outer circumferential surface of the pinch valve body 5a and the inner circumferential surface of the sleeve body 6a, and are assembled to the pinch valve 5. It is being

Therefore, the pinch valve 5 and the sleeve 6 as a whole form a cylindrical body with a diameter that can come into contact with the inner peripheral surface of the interior space 4b, and the cylindrical body formed by the pinch valve 5 and the sleeve 6 is The flange 5b of the pinch valve 5 is the interior space 4b
Interior space 4 of body 4 until it touches the top surface
b Insert from below. As a result, the pinch valve 5 is installed inside the body 4, and the inner peripheral surface of the pinch valve 5 forms a paint passage 5d communicating with the paint passage 4a provided above the body 4. Further, at this time, the air passage 4c opened in the body 4 and the opening 6d provided in the peripheral wall on the side of the sleeve 6 are made to communicate with each other.

Reference numeral 7 denotes an ejector connected to the lower surface of the body 4, and a convex portion 7a is provided at the center of the upper surface of the ejector 7. By inserting it into the lower end space, the pinch valve 5 is pressed and fixed from below. Further, a paint passage 7b provided in the height direction of the ejector opens approximately in the center of the convex portion 7a of the ejector 7, and this convex portion 7a is used as the interior space 4 of the body 4.
By inserting the pinch valve into the inner peripheral surface of the pinch valve 5, the paint passage 5d and the paint passage 7b formed by the inner circumferential surface of the pinch valve 5 are well positioned. The ejector 7 may be of a commonly used structure, and the ejector 7 may have a structure commonly used.
The lower end is connected to a paint hose 8 that is perpendicular to the paint passage 7b and supplies paint to a coating machine (not shown).
Also, at the rear of the connection between the paint hose 8 and the paint passage 7b, there is an air inlet 7 that is blown in from the outside.
c is open. 7d, 7d are the body 4
communicates with screw mounting holes 4e and 4e provided in
A screw attachment hole passing through the ejector 7 in the height direction is shown.

In order to assemble each part of the above configuration, a plate-shaped mounting member 2 is fixed to the lower end of the hopper pyramid part 1b by welding, and a body with a pinch valve 5 and a sleeve 6 installed inside the interior space 4b is attached to the lower surface of this mounting member 2. 4 and then insert the convex portion 7a of the ejector 7 from below into the lower part of the interior space 4b to bring the ejector 7 into contact with the body 4,
Through holes 4e, 4e and 7d, 7 for each screw attachment
d and the screw holes 2b, 2b are communicated with each other.
Insert long screws 9, 9 having large-diameter threaded parts 9a, 9a at their tips into the communicating screw holes, respectively, and screw the threaded parts 9a into the threaded holes 2a of the mounting member 2, The lower ends of the screws are tightened with the knurls 10 to assemble and fix each member.

The paint discharged from the lower end of the hopper is formed by the paint passage hole 2a of the mounting member 2, the tapered opening 4a of the body 4, the paint passage 5d formed by the inner peripheral surface of the pinch valve, and the paint passage 7d of the ejector 7. The paint falls into the ejector 7 through a paint passage opened in the height direction.

In the figure, reference numeral 3 denotes an O-ring housed in an O-ring mounting groove 4d provided on the upper surface of the body 4.

FIG. 2 is a side view showing the entire powder coating material supplying device equipped with an ejector having a coating material supply passage having a pinch valve interposed therebetween as shown in FIG. 1.

As shown in the figure, 1 is a hopper with an upper box-shaped main body 1a and a lower truncated pyramid part 1 connected thereto.
A pinch valve interior body 4 and an ejector 7 are attached to the lower end discharge port of the pyramidal portion 1b via an attachment member 2.

On the top surface of the box-shaped hopper body 1a, there is a hopper 1
Paint inlet 1 large enough to easily supply paint to
A lid 12 with 1 open is provided. Lid 12
is fixed to the hopper 1, for example, with bolts (not shown), and an upper lid 14 having a handle 13 is placed above the paint inlet 11.

An ejector 7 is attached to the outlet of the truncated pyramidal part 1b connected to the lower part of the box-shaped body 1a of the hopper via the pinch valve interior body 4. Paint supply tube 8 connected to (not shown)
is connected. On the other hand, an air hose 15 for supplying and exhausting air for pinch valve operation is connected to the body 4.
An air hose 1 is connected to an air passage 4c opened in the side wall, and is used to supply air to the ejector 7 for controlling the amount of powder paint discharged and for cleaning.
6 is connected. Further, a vibrator mounting plate 17 is joined to the side surface of the pyramidal portion 1b by welding, and a vibrator 18 is mounted approximately in the center of this mounting plate 17.

The hopper 1 having the above structure is elastically supported by fixing a protrusion 1c provided on the outer periphery of the side wall of the main body 1a and a frame 19 via a coil spring 20.
When 8 is activated, it vibrates slightly.

The hopper 1 is made of stainless steel SUS304, for example, and has a main body 1a and a pyramidal portion 1b formed into a predetermined size and shape, and then integrated by welding. The lid 12, paint inlet 11, and upper lid 14 are also made of the same material and assembled by welding. As the vibrator 18, a vibrator model V-20B manufactured by Shinko Electric Co., Ltd. was used. The pinch valve interior body 4 and the main body of the ejector 7 are made of aluminum or resin such as polyethylene, the pinch valve 5 is made of natural rubber, and the sleeve 6 is made of brass or the like.

In the powder coating supply device having the above configuration, the upper lid 1
4 and feed the powder paint into the hopper 1 through the paint inlet 11. After charging, the vibrator 18 is activated to slightly vibrate the hopper 1. At this time, the pinch valve 5 connects the air hose 15 to the body 4.
Air is blown into the space formed between the outer peripheral surface of the pinch valve 5 and the inner peripheral surface of the sleeve 6 through the air passage 4c and the opening 6a of the sleeve 6 (in the figure).
Since the paint passage 5d is blocked, paint does not enter into the ejector 7.

In response to a supply command from another system to the coating machine (not shown), the air for closing the pinch valve 5 is discharged from the air hose 15 (indicated by arrow y in the figure), and the pressure applied to the outer circumference of the pinch valve 5 is released. , the paint passage 5d is opened. After that, ejector 7
Air is sent to the hopper 1 through an air hose 16 (indicated by an arrow _z1 in the figure), and the powder paint in the hopper 1 is sucked by the Ventury effect, and a fixed amount of paint is supplied to the coating machine through the paint hose 8. At this time, the pinch valve 5 may be opened and the air supplied to the ejector 7 at the same time.

During the above operation, the hopper 1 is constantly vibrating slightly due to the operation of the vibrator 18, so as long as the vibrator 18 is operated, the paint in the hopper is continuously sent through the paint passage to the ejector 7 below. It will be done.

In response to a paint supply stop command from another system to the paint sprayer, pinch valve operation air is sent through the air hose 15 to the space between the pinch valve 5 and the sleeve 6, the pinch valve 5 is closed, and the paint passage 5d is cut off. Ru.

Thereafter, air for cleaning the paint remaining in the paint hose 8 is sent to the ejector 7 via the hose 16 (indicated by arrow _z2 in the figure), and the inside of the paint hose 8 is cleaned for a certain period of time. After the paint supply is finished, the vibrator 18 is stopped.

The device of the present invention is not particularly limited to the above description, and the body 4 may have a cylindrical shape. Further, as the ejector 7, a commonly used commercially available product can be used.

FIG. 3 shows the results of measuring changes over time in the discharge amount in the conventional device and the device of the present invention using an epoxy powder coating. In the figure, the solid line shows the discharge amount of the inventive supply device, and the broken line shows the change in the discharge amount of the conventional device. As is clear from Fig. 3, with the conventional device, an amount of 44 g/10 seconds is supplied during the initial 0 to 10 seconds of discharge, which is approximately 2.4 times the stable supply amount of 18 g/10 seconds. Ta. On the other hand, with the device of the present invention, a stable amount was supplied from the beginning.

As is clear from the above description, the powder paint supply device of the present invention supplies paint into the ejector only when paint is being supplied, and the pinch valve is closed at other times, so no excess paint enters the ejector. Therefore, when supplying paint again, an abnormally large amount will not be supplied to the coating machine. Therefore, defects on the coated surface of the object to be coated and loss of paint do not occur.

Furthermore, since the paint passage is closed by the pinch valve during paint hose cleaning, the paint hose can be efficiently cleaned without the cleaning air flowing back into the hopper. In addition, even if the paint hose is long or has a large diameter and there is a large pressure loss when blowing cleaning air, the inside of the hose can be sufficiently cleaned and any residual paint inside the paint hose can be completely removed, so painting can be restarted. At the same time, there is no problem of an abnormally large amount of paint being supplied to the coating machine, unlike in conventional devices. Therefore, occurrence of defects in the coated surface of the object to be coated can be prevented.

In addition, since the device of the present invention uses a pinch valve to open and close the paint passage, the opening and closing operations are easy and there is no problem of clogging with powder paint that occurs with other on-off valves. Furthermore, since the pinch valve is made of rubber, it serves as a sealing material in the coating passage, and powder paint does not leak to the outside.

[Brief explanation of the drawing]

Figure 1a is a sectional view taken along the line b-b showing the main parts of the powder coating supply device of the present invention;
The figure is a side view showing the entire powder coating material supplying device of the present invention, and FIG. 3 is a graph showing changes over time in the discharge amount of the device of the present invention and the conventional device. In the figure, 1... hopper, 1b... hopper truncated pyramid part, 2... mounting member, 4... pinch valve interior body, 4b... interior space, 5...
Pinch valve, 6...Sleeve, 7...Ejector, 8...Paint hose, 15, 16...Air hose.

Claims (1)

[Scope of utility model registration request] A pinch valve is installed in the paint passage between the hopper and the ejector, and the pinch valve is opened only when powder paint is supplied to communicate the hopper and the ejector, and at other times, the pinch valve is closed to block the paint passage. A powder coating supply device characterized by: