JPH1034046A - Method for collecting sludge in coating booth and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To economically collect a sludge in a liquid over- sprayed coating material caught in water, oil and the like. SOLUTION: The liquid in the coating booth is fed in circulation from a feed pipe 4 to a rotary drum 1 rotating at a high speed, The sludge in the liquid is separated by a centrifugal force and deposited on the drum inside wall. When the thickness of the deposition becomes a specified one, the feed of the liquid is stopped and the sludge is scraped-off with a spatula body integrated with a cylindrical body 6. The scraped sludge is discharged from a slit 9 into the cylindrical body 6 and discharged by a rotary screw 7. Since the cylindrical body 6 rotates about 90 deg. with a motor 19 and the spatula body can be brought into contact with and be released from the drum inside wall. This operation can be automatically controlled by properly setting the time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint booth installed in a spray painting factory for removing and recovering sludge (paint residue) mixed in a liquid such as water or oil that catches overspray paint. The present invention relates to a method and an apparatus for collecting sludge of a coating booth.

[0002]

2. Description of the Related Art Conventionally, as a painting booth, a method of catching an oversprayed paint with a wall such as a water or oilfall or catching it with a swirl of water has been widely used. The captured paint precipitates in the liquid as paint residue and becomes sludge. This sludge is manually removed from the bottom of the liquid tank (tank) using a special scoop or the like. In addition, a sludge clogged in a pump or a pipe used for circulating a liquid needs to be repaired by requesting a specialist.

[0003]

As described above, according to the conventional method of collecting sludge of a painting booth, cleaning and maintaining the performance of the painting booth require enormous labor and cost. Also, even if you actually think that cleaning is necessary, daily work is given priority and cleaning is neglected, and if you notice, the function of the painting booth can not be fulfilled, so you will have to spend valuable time cleaning work unavoidably. There was a problem. The present invention has been made in order to solve such a problem, and a method of collecting a sludge of a coating booth which can easily remove and collect sludge trapped in a liquid of the coating booth without human intervention, and The aim is to obtain a device.

[0004]

According to the present invention, there is provided a method for collecting sludge in a coating booth, wherein a liquid such as water or oil capturing the paint is fed into a rotating drum, and the paint is recovered by centrifugal force caused by high-speed rotation. The sludge is deposited on the drum wall, and after the proper landing, the supply of liquid is stopped, the spatula provided inside the drum is brought close to the drum inner wall, and the sludge is scraped off by the spatula and discharged and collected outside the drum. It is. Further, the above operations are automatically controlled at predetermined time intervals.

A sludge collecting apparatus for a coating booth according to the present invention comprises a rotating drum on which a liquid capturing a paint is fed and a sludge of the paint is deposited on an inner wall by centrifugal force. And a spatula provided for removably contacting the drum wall, and a cylindrical body for discharging the scraped sludge out of the drum with a rotary screw. Further, a control means is provided for automatically controlling the operations of feeding the liquid to the rotating drum, scraping the sludge by the spatula, and discharging the sludge by the rotating screw at predetermined time intervals.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. In FIG. 1, a rotating drum 1 has one bottom surface as shown in FIG. 3, is connected to a motor 2 by a shaft 3, and rotates at high speed. The liquid capturing the overspray paint is circulated and fed into the rotary drum 1 by the feed pipe 4.
Further, a sludge discharge mechanism 5 is provided in the rotary drum 1 in parallel with the drum shaft and close to the inner wall of the drum. As shown in FIG. 2, the sludge discharge mechanism 5 includes a cylindrical body 6 and a rotary screw 7 housed therein. As shown in FIG. 4, a spatula 8 having a length corresponding to the length of the rotary drum 1 is fixed to the cylindrical body 6.
Is connected to the inside of the cylindrical body 6 by a slit 9. Spatula 8
The saw-toothed plate 1 shown in FIG.
By mounting 2 as shown in FIG. 2, it is possible to improve the effect of scraping off a highly adhesive sludge.
Further, the slit 9 facing the spatula 8 with the slit 9 interposed therebetween.
A weir plate 10 is provided on the side of the cylinder 6 to form a funnel so that the scraped-off sludge can be easily guided into the cylindrical body 6. At the end of the cylindrical body 6, a sludge outlet 11 is provided. Further, as shown in FIG.
5 is helically welded counterclockwise and provided with a clockwise stopper 16 at the end.

In FIG. 1, a rotary screw 7 is rotated by a motor 17. The cylindrical body 6 has the lever 13 and the link 1
8. Can be rotated about 90 degrees by the motor 19. The discharge port 11 of the cylindrical body 6 is located at a position where the spatula 8 opens downward when the sludge is being scraped off at the uppermost position, and the discharge pipe 20 is located below the discharge port 11. Rotating drum 1
A conduit 22 is connected to a liquid receiver 21 that receives the residual liquid from the container. As described above, stainless steel or the like is desirable as the material of the member that comes into contact with the trapping liquid or the sludge.

Next, the operation will be described. The liquid in the coating booth is circulated and supplied from the supply pipe 4 into the rotating drum 1 rotating at a high speed by a pump. The sludge mixed in the liquid is separated and adheres to the inner wall of the rotating drum 1 by centrifugal force, and the remaining liquid overflows into the liquid receiver 21 and returns from the conduit 22 to the tank. When the landing of the sludge reaches a predetermined thickness, the supply of the liquid is stopped, and the process proceeds to scraping the sludge by the spatula 8. The cylindrical body 6 includes the lever 13, the link 18, and the motor 1
FIGS. 7 and 8 show a change in the relative position between the tip of the spatula 8 and the inner wall of the rotating drum 1 when the spatula 8 is rotated by about 90 degrees according to FIG. When the liquid is being supplied from the supply pipe 4, the tip of the spatula 8 is separated from the upper inner wall of the rotating drum 1, and the deposition of the sludge proceeds in the state of FIG. When scraping off the sled, the motor 19 is operated to move the cylinder 6 to about 90
Rotate degrees. In this process, the sludge is peeled off from the inner wall of the rotating drum 1 where the spatula 8 is rotating, and the state shown in FIG. 8 is obtained. The above operations of the spatula 8 are performed at appropriate time intervals.

The sludge peeled off with the spatula 8 is the spatula 8
, Along the dam plate 10, into the cylindrical body 6 from the slit 9, and is sequentially sent out to the discharge port 11 by the rotating rotary screw 7, and is collected from the discharge pipe 20. The sludge is pushed out from the inside of the cylindrical body 6 and discharged. At this time, the compression effect of the rotary screw 7 is added, and the sludge has an advantage that the liquid content is further reduced. Further, in actuality, although not shown, the entire structure is provided by providing an automatic control device for controlling the operation time of each motor, a cover for preventing the liquid from splashing, and an outer cover for preventing mechanical noise and danger.

Next, the automatic operation will be described with reference to specific numerical examples. It is necessary to change and adjust the conditions of the automatic operation depending on the properties of the liquid and the amount of the sludge in the coating booth. As an example, the diameter of the rotating drum 1 is 240 mm, the depth is 240 mm, and the rotation speed is 1400 r / min. The diameter of the rotary screw 7 is 48 mm, and the number of rotations is 30 r / min. The inner diameter of the feed pipe 4 is 16 mm, and the flow rate of the liquid through the feed pipe 4 is about 30 l.
/ Min, and the rotating drum 1 and the rotating screw 7 always rotate. The supply of the liquid by the supply pipe 4 stops in 30 minutes, and after the stop, the position of the lever 13 is changed to the motor 19.
(At a rotation speed of 5 r / min), the rotation of the spatula 8 is stopped at a position where the tip of the spatula 8 approaches the upper inner wall of the rotating drum 1 to 0.5 mm or less, that is, a position shown in FIG. In this state, three minutes have passed. During this time, the sludge deposited on the inner wall of the rotating drum 1 is discharged from the discharge port 11 to the outside via the discharge pipe 20 and collected in a can or the like. After a lapse of 3 minutes, the position of the lever 13 is again rotated by 90 degrees by the motor 19, and stops at the position where the tip of the spatula 8 is separated from the inner wall of the rotating drum 1, that is, the position shown in FIG. At this time, since the spatula 8 is oriented horizontally or obliquely upward, the sludge remaining on the spatula 8 does not fall. Then feed pipe 4
Of the liquid is restarted by the operation of the pump motor. The repetition of this operation cycle is performed by automatic control, and the operation is performed continuously.

[0011]

As is apparent from the above description, according to the present invention, the liquid in which the overspray paint is captured is fed into the rotating drum, and the paint residue is centrifugally separated and deposited on the drum wall. Since the sludge is scraped off with a spatula and collected, the manpower and cost required for maintenance of the painting booth can be significantly reduced, and the economical effect and the rationalizing effect on the environment are extremely large. In addition, paint sludge separated and recovered from liquids is easy to dispose of as industrial waste, and it is convenient to dispose of it when wastewater recycling technology is developed in the future. Is also very effective.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of the present invention.

FIG. 2 is a perspective view of a sludge discharge mechanism in FIG.

FIG. 3 is a perspective view of the rotating drum in FIG. 1;

FIG. 4 is a perspective view of a cylindrical body in FIG. 2;

FIG. 5 is a perspective view of the sawtooth plate in FIG. 2;

FIG. 6 is a perspective view of the rotary screw in FIG. 2;

FIG. 7 is a schematic diagram for explaining the operation of one embodiment of the present invention.

FIG. 8 is a schematic diagram for explaining the operation of one embodiment of the present invention.

[Explanation of symbols]

1 rotating drum 10
Weir plate 2, 17, 19 Motor 11
Outlet 4 Feeding pipe 12
Sawtooth plate 5 Sludge discharge mechanism 13
Lever 6 Cylindrical body 18
Link 7 Rotating screw 20
Drainage tube 8 spatula 21
Liquid receiver 9 Slit 22
conduit

Claims (5)

[Claims] 1. A liquid capturing an oversprayed paint is fed into a rotating drum rotating at a high speed, and a sludge of the paint is deposited on an inner wall of the rotating drum by centrifugal force. A method for recovering a coating spice, wherein the spatula installed in the rotating drum is stopped and brought close to the inner wall of the rotating drum, and the sludge is scraped off by the spatula and discharged out of the rotating drum. 2. The sludge recovery of a coating booth according to claim 1, wherein the feeding of the liquid, the contact and separation of the spatula with the inner wall of the rotary drum, and the discharge of the sludge are automatically controlled at predetermined time intervals. Method. 3. A rotating drum on which a liquid capturing the oversprayed paint is fed and a sludge of the paint is deposited on an inner wall by centrifugal force by high-speed rotation, and is installed in the rotating drum in parallel with a drum axis. Then, the spatula body which can be brought into contact with and separated from the inner wall of the rotary drum and scrapes off the piled-up sludge, and the scraped-off sludge which accommodates a rotary screw and is fed through a slit, is moved out of the rotary drum. A sludge collection device for a painting booth that has a cylindrical body to discharge. 4. A rotary drum in which a liquid capturing the oversprayed paint is fed and a sludge of the paint is deposited on an inner wall by centrifugal force caused by high-speed rotation, and a saw-toothed plate is arranged in parallel with the rotary drum. A spatula that is installed parallel to the drum axis and is capable of coming into contact with and separating from the upper inner wall of the rotating drum and scraping off the deposited sludge, and a slit that houses a rotating screw and forms a funnel shape together with a weir plate And a cylindrical body for guiding the scraped sludge fed through the outside of the rotary drum to the outside of the rotary drum. 5. A control means for automatically controlling supply of a liquid to a rotating drum, contact and separation of a spatula with an inner wall of the rotating drum, and operation of a rotating screw at predetermined time intervals. The sludge collecting device for a coating booth according to claim 3 or 4.