JPH10101226A - Fine particle paint supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make paint excellent in use efficiency and supply capacity, and also facilitate color changing, moreover prevent the occurrence of impact fusion. SOLUTION: A lid part 6 is mounted on the drum can 2 for fine particle paint, and the drum can 2 is retained in an overturned or fitted condition by a holding device 1. Carrying air is supplied to a carrying hose 12 via a carrying air supplying port 17 from an air panel 18 to open a pinch valve 11 to operate a vibrator 9, and a flowing air is supplied to the air chamber 8 of the lid part 6 to make the fine particle paint in the drum can 2 flowable. This discharges the fine particle paint to the carrying hose 12 from a discharge port, positioned in the lowermost part of the overturned drum can 2, to supply the fine particle paint to a paint tank 21 by the carrying air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder paint supplying apparatus, and more particularly to a powder tank for a powder coating system for supplying powder paint from a drum maker, which is supplied and accommodated in a drum by a paint maker. To a device for transferring to

[0002]

2. Description of the Related Art Powder coating has attracted attention and has been developed as an environmentally friendly non-polluting coating method because no solvent is used. In this powder coating, the powder paint sucked from the paint tank via the paint transport hose is supplied to the powder coating gun, sprayed from the powder coating gun onto the workpiece, and deposited on the surface of the workpiece. Is done.

In order to continuously perform such powder coating, it is necessary to continuously or intermittently supply the powder coating to the coating tank so that the coating tank does not become empty. Usually, powder paint is supplied from a paint maker in a drum of 200 liters in capacity, for example. A device for directly supplying powder paint from the drum to a paint tank is disclosed in, for example, JP-A-59-74818. Is known. In this powder transfer device,
A nozzle is inserted from above into a drum can supported upright or obliquely, and powder paint is sucked up by an ejector pump connected to the upper end of the nozzle. The ejector pump forms a negative pressure in the nozzle by passing compressed air at the upper end of the nozzle, and uses this negative pressure to suck up the powder coating material from the nozzle tip to the upper end and pump it along with the compressed air. is there.

[0004]

A large amount of compressed air is required to suck up the powder paint from the inside of the drum using an ejector pump. Since the compressed air and the powder paint are mixed, a conventional cyclone is used. Used to separate the powder coating from the compressed air before supplying it to the coating gun. However, there is a problem that a part of the powder paint sucked up from the drum can is discarded together with the compressed air without being collected by the cyclone, and the use efficiency of the paint is reduced.

[0005] Further, in a system in which a powder paint is sucked up using a negative pressure by an ejector pump, the supply capacity of the paint is, for example, at most about 2 kg / min. May be. At the time of changing the color of the paint, it is necessary to clean the conveying path of the powder paint by air purging or the like, but there is also a problem that it takes time to clean the nozzle, the ejector pump, and the cyclone. Furthermore, since powder paint is pumped using a large amount of compressed air, impact fusion in which the powder paint adheres in the transport path occurs, and the transport path is blocked or the paint once adhered is transported again and painted. There is a possibility that the quality of the surface may be deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and is intended to provide a powder coating material which is excellent in paint use efficiency and supply capability, can easily change colors, and can prevent the occurrence of impact fusion. It is intended to provide a device.

[0007]

SUMMARY OF THE INVENTION A powder coating material supply device according to the present invention is a device for supplying powder coating material stored in a drum can. A lid for closing the opening of the drum can with a perforated plate having a discharge port, a holding device for holding the drum in an inverted or inclined state so that the lid faces downward, and a discharge port of the lid. The powder paint is discharged from the outlet of the lid by supplying the air for flow to the inside of the drum can through the transfer hose and the perforated plate of the lid, and the supply air is supplied into the transfer hose to supply the powder paint. And an air supply device that transports the air.

[0008] The transfer hose may be provided with a pinch valve. Further, a vibrator can be provided on the lid.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a powder coating material supply apparatus according to an embodiment of the present invention. The drum 2 is held by the holding device 1. The holding device 1 has an upright mast 3, and an arm 5 that moves up and down along the mast 3 by turning a handle 4 and that holds the drum 2. The drum 2 sandwiched between the arms 5 can be manually turned around a horizontal axis to be in an inverted state as shown in FIG.

The drum 2 has a cylindrical shape and is open at one end, and contains a powder coating therein.
Supplied by a paint maker with the open end closed. Instead of the lid, a lid 6 of the powder coating material supply device is attached to the opening end. As shown in FIG. 2, the lid 6 includes a circular perforated plate 7 having a diameter substantially similar to the inner diameter of the drum 2. The perforated plate 7 has a thickness of 5 to 10 μm so that air can pass therethrough but powder paint cannot pass through.
It has innumerable small holes of about m and is made of plastic or sintered metal. An air chamber 8 is formed at the back of the perforated plate 7, and a vibrator 9 that is activated by air is fixed to the back of the air chamber 8. A discharge port 10 for powder coating is formed in a part of the perforated plate 7, and a transfer hose 12 is connected to the discharge port 10 via a pinch valve 11. Further, a fastener 13 for fixing the lid 6 to the peripheral edge of the drum 2 is provided along the peripheral edge of the lid 6 so that the lid 6 does not come off even when the drum 2 is inverted.

As shown in FIG. 3, the pinch valve 11 has a cylindrical elastic member 14 such as rubber, which is formed to have substantially the same diameter as the discharge port 10 and forms a part of the transport path.
An air chamber 15 is formed on the outer periphery of the elastic member 14. By supplying the compressed air into the air chamber 15, the elastic member 14 is deformed, and the conveying path can be closed. On the downstream side of the elastic member 14, the annular porous material 1 is provided.
A transfer air supply port 17 for supplying transfer air through the transfer path 6 is formed in the transfer path.

In FIG. 1, an air panel 18 is connected to the air chamber 8 and the vibrator 9 of the lid 6, the pinch valve 11 and the transport air supply port 17, respectively, and a control unit 19 is connected to the air panel 18. Further, a cleaning device 20 for cleaning the transfer hose 12 is connected to the control unit 19. The distal end of the transfer hose 12 is connected to a paint tank 21 of the coating apparatus.

The air panel 18 constitutes the air supply device of the present invention, and has an air circuit as shown in FIG. The flow air supplied to the air chamber 8 of the lid 6 is 0.5 to 1 kgf / cm ² , the air for the vibrator supplied to the vibrator 9 is 3 to 5 kgf / cm ² , and the air for the pinch valve supplied to the pinch valve 11 is 3 kg
f / cm ^2, the transport air supplied from the conveying air supply port 17 to the conveyance path is set to the 1~2kgf / cm ^2. Here, as the electromagnetic valve 23 for controlling the supply of the flowing air and the vibrator air, an
A valve that opens in a state and closes in an OFF state in which power is shut off is used. On the other hand, the electromagnetic valve 22 for controlling the supply of the air for the pinch valve and the electromagnetic valve 24 for controlling the supply of the carrier air are, on the other hand,
A valve is used that closes in the N state and opens in the OFF state where the power is shut off. This is to prevent the supply of the carrier air from being cut off and the powder paint from clogging in the carrier hose 12 when a power failure occurs during operation.

Next, the operation of the powder coating material supply apparatus according to this embodiment will be described with reference to the timing chart of FIG. The electromagnetic valves 22 and 23 are turned off and the electromagnetic valve 24 is turned on in advance. This allows
Pinch valve air is supplied to the pinch valve 11, and the pinch valve 11 is closed.

The lid of the powder paint drum 2 supplied by the paint maker is removed, and the lid 6 is attached instead. The drum 2 with the lid 6 attached is held between the arms 5 of the holding device 1, and the handle 4 is turned to raise the drum 2 with the arms 5. When the drum 2 rises to a height that allows the drum 2 to be inverted, the drum 2 is manually rotated around a horizontal axis to be in an inverted state or an inclined state so that the lid 6 faces downward. Then, when the transport start operation is performed at time T1,
The air panel 18 is controlled by the control unit 19, and the electromagnetic valve 24 is turned off, that is, opened, so that the transfer air is supplied from the transfer air supply port 17 to the transfer hose 12 through the porous material 16.

Time T2, which is about 15 seconds after time T1
Then, the electromagnetic valve 22 is turned on, that is, closed, the supply of air for the pinch valve to the pinch valve 11 is cut off, and the pinch valve 11 is opened. Further, at time T3, which is about 15 seconds after time T2, the electromagnetic valve 23
Is turned on, that is, opened, and the flowing air is supplied to the air chamber 8 of the lid 6 and the vibrator air is supplied to the vibrator 9 so that the entire lid 6 starts to vibrate. The flowing air supplied to the air chamber 8 enters the drum 2 from the myriad of small holes of the perforated plate 7, whereby the powder paint in the drum 2 flows and is located at the bottom of the inverted drum 2. Pinch valve 1 from outlet 10
The powder coating material is discharged to the transfer hose 12 through 1.
Further, the powder paint is transported in the transport hose 12 by the transport air and supplied to the paint tank 21.

When the powder coating was supplied using the transfer hose 12 having a diameter of 25 mm, a transfer amount of about 10 kg / min was obtained.

At the end of the supply of the powder coating material, the electromagnetic valve 23 is turned off at time T4 to stop the supply of the flowing air and the vibrator air.
At time T5 when about 5 seconds have elapsed, the electromagnetic valve 22 is turned off.
In this state, the air for the pinch valve is supplied to the pinch valve 11, and the pinch valve 11 is closed. Further, at time T5
At a time T6 when about 15 seconds have elapsed since the start of the operation, the electromagnetic valve 24 is turned on, and the supply of the conveying air is stopped.

When the color of the paint is changed, after the supply of the powder paint is completed as described above, the drum 2 is returned to the upright state, the lid 6 is removed from the drum 2, and the tip of the transfer hose 12 is moved. The cleaning unit 20 is driven by the control unit 19 by inserting the unit into the cleaning device 20, and cleaning air is blown from the cleaning device 20 into the transfer hose 12. As can be seen from FIG. 3, the vicinity of the pinch valve 11 and the discharge port 10 connected to the transfer hose 12 has almost no complicated shape protruding into the transfer path. Is easily removed. Further, the perforated plate 7 of the lid 6 and its peripheral portion are cleaned by air blow.

After the cleaning is completed as described above, the lid 6 is placed on the drum containing the powder paint to be coated next.
Apply and paint.

Although not shown, the paint tank 21
Is provided with a sensor for detecting the upper limit position of the powder paint. When the sensor detects that the powder paint in the paint tank 21 is full, the control unit 19 stops the supply of the powder paint. Is done. The operation at the time of this stop is the same as the operation at times T4 to T6 in the above-described timing chart of FIG. Further, the control unit 19 determines that the upper limit position detection sensor is in the OFF state, that is, the paint tank 2
After a certain period of time has passed after 1 is not full,
The operation at times T1 to T3 in the timing chart of FIG. 5 is performed, and the supply of the powder paint is started. The controller 19 is provided with a selector switch for starting / stopping the operation of the powder coating material supply apparatus. Normally, when the operation is started, the supply stop / start is automatically controlled by turning on / off a sensor for detecting an upper limit position. I do.

In the timing chart of FIG. 5, the intervals between times T1, T2 and T3,
Although the intervals between T5 and T6 are all set to about 15 seconds, the present invention is not limited to this, and the time intervals can be appropriately selected according to the transport amount or the like.

[0023]

As described above, according to the present invention, since no cyclone is used, the use efficiency of the paint is improved, the supply capacity is large, and the color of the paint can be easily changed. Further, it is possible to prevent the conveyance path from being blocked due to the occurrence of impact fusion, and prevent the quality of the painted surface from deteriorating.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a powder coating material supply device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a lid used in the embodiment.

FIG. 3 is an enlarged cross-sectional view showing a main part of a lid used in the embodiment.

FIG. 4 is a diagram showing an air circuit of an air panel used in the embodiment.

FIG. 5 is a timing chart showing the operation of the powder paint supply device according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Holding device 2 Drum can 3 Mast 4 Handle 5 Arm part 6 Cover part 7 Perforated plate 8, 15 Air chamber 9 Vibrator 10 Discharge port 11 Pinch valve 12 Transport hose 13 Fastener 14 Elastic member 16 Porous material 17 Transport air supply port 18 Air panel 19 control unit 20 cleaning device 21 paint tank 22-24 electromagnetic valve

Claims (3)

[Claims] 1. A device for supplying a powder coating material contained in a drum can, wherein the opening portion of the drum can is closed with a perforated plate mounted on the opening portion of the drum can and having an outlet for powder coating material formed therein. A lid, a holding device that holds the drum in an inverted state or an inclined state such that the lid faces downward, a transfer hose connected to a discharge port of the lid, and a perforated plate of the lid. An air supply device that supplies powder air from the outlet of the lid by supplying air for flow to the inside of the drum and supplies transport air into the transport hose to transport the powder paint. A powder paint supply device characterized by the above-mentioned. 2. The apparatus according to claim 1, further comprising a pinch valve provided on the transfer hose. 3. The device according to claim 1, wherein the lid has a vibrator.