JP2005329342A - Sludge recovery apparatus from treated liquid for coating booth - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple apparatus capable of stably recovering the sludge in the coating booth without plugging suspended in a treated liquid layer as an apparatus by which the sludge is scooped with a simple means and is fed to a dehydration means effectively and surely. <P>SOLUTION: A recovery vessel (measure) rocking up and down is arranged in a part of a water tank, a partition is provided in the middle of the vessel to divide the vessel into an upper and a lower part, an automatic opening and closing valve is provided in the partition part and when the recovery vessel is pulled up, a sludge mixed liquid in the tightly closed lower part chamber is fed to a dehydration means by the force of compressed air. The recovery vessel repeats the continuous up and down movement. The sludge confined by the automatic opening and closing valve opened and closed with the movement is recovered intermittently continuously with the treated liquid. The compressed air supplied to the sludge mixed liquid in the recovery vessel is jetted into the liquid to effectively mix the sludge mixed liquid in recovery vessel to stir and pulverize the sludge. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to an apparatus that collects spray mist such as paint in a water washing booth in spray coating and collects the liquid level of a water tank in a wet paint booth and paint sludge floating in the liquid.

In the painting workplace, it is important to collect the excess mist of paint sprayed from the spray gun, etc. onto the object to protect the work environment and prevent air pollution. It is indispensable from the problem. Therefore, a painting booth is used at the painting site. Many of the painting booths use a fan or the like to create an air flow toward the painting chamber and introduce surplus mist, and the processing liquid such as water or oil stored in the water tank crosses the air current in the painting chamber by a pump or the like. A device is used that forms a liquid film or a shower that collides, collects excess paint mist by contact with the processing liquid, and takes it into a water tank.

In addition, there is a wet painting booth in which a processing liquid in a water tank is drawn using the suction force of the fan itself, and paint mist is collected by a liquid film or vortex and taken into the water tank. In these wet coating booths, management and processing of the contaminated processing liquid that takes in and stores paint is always a problem from the viewpoint of preventing water pollution and processing industrial waste. Therefore, a paint sludge collecting device has been proposed so far, in which paint sludge is separated from the contaminated reservoir liquid, the treatment liquid is purified, and this can be reused in the wet paint booth.

Regarding the paint sludge recovery device, there are a paint sludge collection system for wet paint booths disclosed in Japanese Patent Application Laid-Open No. 10-113857 by the applicant of the present invention, and a sludge recovery structure for a water washing paint booth disclosed in Japanese Patent Application Laid-Open No. 2000-325842. In the inventions of these applications, as an effective method for sucking and collecting the paint sludge stored in the water tank of the wet coating chamber together with the treatment liquid, means for collecting the sludge or means for making it easy to collect is disclosed. Yes. Paint sludge is mixed in the water tank in various forms depending on the type of paint used and the amount of spray, floats in a dispersed state on the liquid surface, matte on the liquid surface, floats in a lump, liquid It is classified into those that suspend in it and those that settle. These forms can be changed to some extent depending on the treatment agent mixed in water or the like, but it is virtually impossible to change each time depending on the paint used and the amount used, and any form is desirable. It is desirable to use a device that can be recovered.

The conventional recovery device described above is not suitable for allowing sludge floating as a mat or lump on the liquid surface to flow into the recovery container, and the paint accumulates as a lump. Further, even if these are finely dispersed by the crushing means, many bubbles on the liquid level generated during crushing are taken in, and a new problem occurs that the pumping function is impaired in the conventional submersible pump.

In addition, there is a method of replacing the submersible pump with a pump that sucks the treatment liquid mixed with sludge with a positive displacement pump, but in this case the suction force is limited to atmospheric pressure at the maximum, and fluidity is achieved by sufficient stirring. If it is not in a good state, clogging in the suction path is likely to occur, and in order to perform reliable recovery, sludge mixed by recovery must be finely pulverized and constantly stirred so as to obtain an average mixed state.

Various methods of mixing agitation have been proposed, but mechanical agitators are inevitable in terms of installation and maintenance due to costs and burdens on workers, and the agitation by jet flow is premised on stable suction by a pump. For this reason, it is not suitable for a mixed liquid of sludge in which large lumps are easily formed.

Under such circumstances, as a facility that enables recovery regardless of the form of sludge, Japanese Patent Application Laid-Open No. 11-290864 provides a separate wastewater treatment tank to allow the wastewater mixed with sludge to flow in intermittently, and to treat the treatment agent. Although a technique for processing by a method such as adding water is shown, a significant increase in installation location and cost is inevitable, such as the need to add a dedicated processing tank in terms of equipment. Many painting booths used for general purposes are required as equipment installed in small-scale painters and painting processes, and more simple and easy-to-handle devices are desired.
JP-A-8-084947 JP 10-1113587 A Japanese Patent Laid-Open No. 11-290864 JP 2000-325842 A

The present invention provides a device that can effectively take in paint sludge floating in a water tank regardless of its properties by a treatment agent put into a water tank of a wet coating booth and reliably feed it to a sludge treatment apparatus. For this purpose, an apparatus for reliably collecting sludge is provided, and a collection system that can easily collect paint sludge with a long-term maintenance is provided.

In an apparatus for collecting sludge suspended in a water tank of a paint booth that uses a processing liquid to collect paint mist, the present invention provides a collection container that swings up and down in the tank, and the collection container is provided with a partition in the middle. The valve is divided into upper and lower chambers, and a valve that opens and closes according to the vertical movement of the collection container is disposed in this partition. As a result, the sludge taken into the upper chamber when the valve is opened is sent to the lower chamber, and the compressed air sent into the lower chamber when the valve is closed is surely sent out to the dehydration means provided separately from the collection port of the collection container. .

The collection container is arranged so that the top opening of the upper chamber is immersed in the processing liquid when descending, and sludge on the liquid level flows in, and when it rises, it moves up and down so that it comes out on the liquid level. An air cylinder was used. The on-off valve body that contacts and separates from the opening provided in the partition is fixed to the outside in the lower chamber, and is opened and closed by the vertical movement of the collection container.

A recovery port is provided at the bottom of the lower chamber, and sludge is recovered by connecting to an external detreatment water means. A separate compressed air jet is provided in the lower chamber to send compressed air whose pressure has been adjusted. When the room agitation and the on-off valve are closed, the sludge mixture is pumped. If necessary, the working air to the driving air cylinder can be supplied by an adjustable time means, and the sludge collection interval can be arbitrarily controlled.

In the water tank of the wet painting booth, there is a collection container whose upper opening appears above and below the liquid level, and the sludge that has flowed into the collection container by scooping up the sludge floating on the liquid level when it rises is collected when it descends When it rises again, it closes the on-off valve and forcibly pumps it with the compressed air that has been sent in, so that sludge can be reliably recovered. The collection container can be moved up and down at an arbitrary interval by an air cylinder, and sludge collection can be efficiently driven in accordance with the work amount. Also, as the pressure feeding means for sending out the sludge, the compressed air safe for fire and explosion can be used, and the lower chamber can be stirred at the same time, so that the pressure feeding can be facilitated with certainty.

According to this apparatus, the sludge mixed processing liquid pumped up in the recovery container is automatically confined in the pressurizing chamber and forcedly compressed with compressed air, so that a recovery apparatus with a simple structure, low cost and easy maintenance can be obtained. . In addition, since sludge is forcibly sent together with the treatment liquid, the dehydration processing means can separate and collect only sludge with a collection bag made of filter cloth such as hemp bags, and can be disposed of easily. The nature is also high.

Further, the sludge flowing into the collection container will be described in detail with respect to the effects of details such as a shape in which sludge floating on the liquid surface is taken in a wide range and collected in the collection container.

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the entire collection device installed in the water tank of the painting booth. The recovery container 1 of the recovery apparatus is shown in a state where it is sinked in a water tank showing only the liquid level A of the processing liquid stored by taking in the sludge. The recovery container is divided into an upper chamber 3 and a lower chamber 4 by a partition 2 in the middle in the middle, and an opening 5 is formed in the partition 2, and a valve body 6 for opening and closing the opening 5 is fixed to the outside. The valve is attached to the tip of the valve stem and is positioned on the lower chamber 4 side with its vertical position regulated, and is closed when the collection container 1 is in the sunk position in FIG. 1, and the collection container 1 as shown in FIG. When the valve body 6 is in the raised position, the valve body 6 stays at substantially the same position to open.

As shown in FIG. 3 as viewed from the left in FIG. 1, the collection container 1 has a plate-like plate 7 attached to a box-shaped container with wings spread on both sides of the upper chamber 3. As a result, the sludge floating on the plates 7 on both sides is scooped up together with the treated water. For this reason, sludge floating near the liquid surface in a large area is taken in, and the valve body 6 is separated from the opening 5 by the collection container 1 rising together with the plate 7, and the sludge in the upper chamber 3 is lower than the opened opening 5. It flows into the chamber 4. The sludge on the plate 7 is slightly inclined toward the center, flows into the upper chamber 3 and then flows into the lower chamber 4 from the opening 5.

A recovery port 8 is opened at a position near the bottom of the lower chamber 4, and is connected to a separately provided dehydration processing means through a hose (not shown) from a connected joint 9. In another position, an air injection port 10 through which compressed air flows into the lower chamber 4 is provided, and separately adjusted compressed air is fed into the air injection port 10. When compressed air is injected from the air injection port 10 into the lower chamber 4, the processing liquid mixed with sludge is efficiently stirred, sludge pulverized, and mixed by the injection pressure.

When the recovery container 1 descends and the opening 5 is closed by the valve body 6, the compressed air pressurizes the lower chamber 4 and sends sludge in the lower chamber 4 to the dehydration processing means side together with the processing liquid. While the sludge is reliably sent out, the movement of the collection container 1 is controlled by the air cylinder 25 so that the valve body 6 is kept closed.

Although the movement of the collection container 1 is not limited to this example, the pin 28 fixed to the frame body 26 is supported by the moving frame 22 in a state where both sides are suspended by the support 21 as shown in FIG. As described above, the collection cylinder 1 is repeatedly moved up and down by the air cylinder 25 that drives the links 23 and 24 while maintaining the level. The vertical movement and valve opening / closing timing can be easily performed by controlling the supply of compressed air to the air cylinder.

On the other hand, the valve body 6 is attached to the lower end of a valve rod 27 that is pivotally supported in a variable angle state on a frame 26 that is fixed in the same manner as the fulcrum. The shape and material of the valve body 6 are used so that the valve body 6 can be easily fitted into the valve opening portion 5 and brought into close contact therewith. In this example, a flexible rubber material is used as a dome-shaped valve body.

With the above configuration, when the air cylinder 25 is operated from the state where the entire recovery container 1 is submerged in the water tank in the state of FIG. 1 and is lifted together with the moving frame 22, the sludge on the recovery container 1 and the plate 7 is liquid level. The valve body 6 is supported by the fixed frame body 26 and the valve opening 5 is opened, and the processing liquid containing the sludge soaked up flows into the lower chamber. Thereafter, when the collection container 1 is lowered, the valve body 6 is closed, and the lower chamber 4 sealed by the compressed air sent from the air jet 10 is in a pressurized state, and the sludge flowing into the lower chamber is dehydrated all together with the processing liquid. Transferred to processing means.

The dewatering treatment means for the transferred sludge is not limited within the scope of the present invention, but even a simple draining bag using only a filter cloth can be used for separating and removing sludge. For example, according to the configuration of the present invention, the timing of feeding into the dehydration processing means can be arbitrarily set by the up-and-down movement by the operation of the air cylinder, and the amount of sludge fed at one time is within the range of the volume of the lower chamber. It can be easily applied to simple dehydrating means having limitations, and can be applied to various cases.

Further, the compressed air from the air injection port is not limited to the time of pressure feeding, and has an effect of stirring the processing liquid by being always or when necessary, which leads to stable recovery. The position and shape of the injection port, and the injection method are not particularly limited, but it is generally provided on the opposite side where the stirring effect can be expected without directly flowing into the recovery port 8.

It is the block diagram which looked at the collection | recovery apparatus which shows one Example of this invention from the side, and is a block diagram when a collection container is in water. It is a block diagram when a collection container raises in FIG. It is the figure which looked at the collection device of Drawing 1 from the left front.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Collection container 2 Partition 3 Upper chamber 4 Lower chamber 5 Opening part 6 Valve body 7 Plate 8 Collection port 9 Joint 10 Air injection port 21 Support tool 22 Moving frame 23, 24 Link 25 Air cylinder 26 Frame 27 Valve rod

Claims (5)

In a device that collects turbid suspended sludge in a water tank of a painting booth that uses a processing liquid to collect paint mist, a recovery container that swings up and down is provided in the water tank, and a partition is provided in the middle of the recovery container. Divided into chambers, the partition is provided with a valve that opens and closes according to the vertical movement of the collection container, and the lower chamber discharges compressed air jets that pressurize the chamber and the contained sludge mixed processing liquid A sludge recovery device provided with a recovery port. 2. The sludge recovery apparatus according to claim 1, wherein the recovery container is moved up and down so that the opening at the upper end is submerged in the processing liquid at the time of lowering and comes out above the liquid level at the time of rising, and an air cylinder is used as the driving means. The sludge collection device according to claim 1, wherein the on-off valve body is fixed to the outside in the lower chamber and is opened and closed by the vertical movement of the collection container. The sludge recovery device according to claim 1, wherein the recovery port is connected to a dehydrating means, and the outlet of the compressed air is connected to an air supply source capable of adjusting pressure. 3. The sludge collecting apparatus according to claim 2, wherein the working air to the driving air cylinder is supplied by a time-limit means that can be arbitrarily adjusted.

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