JPH06277661A - Separating device for paint sludge - Google Patents

Abstract

PURPOSE:To smoothly and efficiently suck paint sludge along with water in a pit to send out the same. CONSTITUTION:In a paint sludge separation device equipped with a separation tank 6 receiving paint sludge containing water W to subject paint sludge S to float separation in a storage process, a collection pit 8 receiving the floated paint sludge S from the separation tank 6 along with the water W of the surface layer part in the tank 6 and a sludge sending out passage 9 sucking the paint sludge S from the collection pit 8 along with the water W in the pit 8, a revolving means revolving the water W in the collection pit 8 around a vertical axial core of the pit 8 to allow the same to flow is provided. The suction port 9a of the sludge sending out passage 9 is arranged at the position being the revolving center part of the water W in the pit and immersed in the water in the pit. As the revolving means, the inflow port to the collection pit 8 is arranged so that the water W from the inflow port flows in from the position having a circular cross-sectional shape on a plan view and near to the outer periphery in the pit in the direction along the tangential direction of the inner peripheral surface of the pit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint sludge separating device used in coating equipment, and more specifically, a separating tank for inflowing paint sludge-containing water to float-separate the paint sludge during the storage process in the tank. The present invention relates to a paint sludge separating device provided with an accumulation pit for allowing floating paint sludge to flow in together with water in the surface layer of a tank, and a sludge delivery passage for sucking and delivering the paint sludge together with water in the pit from the accumulation pit.

[0002]

2. Description of the Related Art Conventionally, in a paint sludge separating device of the above type, as shown in FIGS.
The coating material sludge S that has floated in the above is overflowed from the weir D together with the water W in the surface layer of the tank to flow into the collecting pit 8, and the coating material sludge is sent out from the collecting pit 8 (generally to the sludge separating and collecting device). ), The suction port 9a of the sludge delivery path 9 is opened at the height of the surface layer of the accumulated material in the accumulation pit 8, and the suction port arrangement allows the accumulated paint sludge S in the accumulation pit 8 to smoothly move with the water W in the pit. That is, only the water W in the pit is sucked and delivered and the paint sludge S remains and accumulates in the accumulation pit 8, and conversely only the paint sludge S on the water surface is accompanied by a large amount of air. It is said that it will be sucked and delivered, and that a large amount of mixed air will lead to transport problems such as air trapping of the pump and performance deterioration of the sludge separation and recovery device in the subsequent process. It was was so as to avoid the situation.

Further, since the water level management in the accumulation pit 8 is important in this type, as shown in FIGS. 5, 6 and 7, the water level control for communicating with the accumulation pit 8 via the communication water passage L is performed. A water tank T is provided, and a water level sensor K in this water tank T
Based on the water level detection by
It was equipped with an auxiliary device for water level control such as controlling the water supply valve V for the water tank T so that the water level in the accumulation pit 8 was adjusted and maintained at an appropriate height with respect to the suction port 9a of the sludge delivery passage 9. .

[0004]

However, in the above conventional apparatus, even if the water tank T for water level control is provided, the water is accumulated due to the fluctuation of the inflow amount into the accumulation pit 8 caused by the fluctuation of the water level of the separation tank 6. The water level in the pit 8 is likely to fluctuate (especially when the capacity of the water tank for water level management T is limited by the installation conditions, etc.), and therefore the water level in the accumulation pit 8 becomes too high with respect to the intake port 9a of the sludge delivery passage 9. That the coating sludge S remains and accumulates in the accumulation pit 8 and that the water level in the accumulation pit 8 becomes too low and the coating sludge S is sucked and delivered in a large amount of air is still likely to occur. Met.

Further, since an auxiliary device for water level management such as the water tank T and the water level sensor K is provided, there is a problem that the device becomes large and complicated and the required installation space becomes large, and the device cost increases. Moreover, troubles such as the water level detection function being impaired due to adhesion and deposition of paint sludge S entering the water level control water tank T via the communication water passage L, and the communication water passage L being clogged are likely to occur. The frequency and amount of maintenance work were also large.

An object of the present invention is to solve each of the above problems by adopting a rational suction mode for the suction and delivery of paint sludge from the accumulation pit.

[0007]

A first characteristic configuration of a paint sludge separating device according to the present invention is a separation tank for inflowing paint sludge-containing water to float-separate the paint sludge during the storage process in the tank, and from the separation tank. In a configuration in which a collecting pit for allowing the floating paint sludge to flow in together with the water in the surface layer of the tank and a sludge sending path for sucking and sending the paint sludge from the collecting pit together with the water in the pit are provided, The swirl means for swirling and flowing around the axis is provided, and the suction port of the sludge delivery passage is arranged at a position where it is immersed in the water in the swirl pit at the swirl center of the water in the pit.

Second of the paint sludge separating device according to the present invention
The characteristic configuration is that, as the turning means, an inflow port to the accumulation pit is oriented in a direction along a tangential direction of an inner peripheral surface of the pit from a position near the outer periphery inside the pit in which inflow water has a circular sectional shape in plan view. It is arranged to inflow.

Third of the paint sludge separating device according to the present invention
The characteristic structure is to provide a channel side wall for sludge accumulation guide for gradually narrowing the channel width from the side of the separation tank toward the side of the accumulation pit, and clean water is provided to the inner wall surface of the channel side wall. This is because a water discharge means for discharging clean water is provided so as to apply the water.

[0010]

In other words, in the above-mentioned first characteristic configuration, the internal water of the accumulation pit is forcibly swirled around the longitudinal axis by the swirling means, so that the paint sludge in the accumulation pit has a difference in specific gravity from water. As a result of being drawn into the swirl center and gathering, the suction port of the sludge delivery passage located at the position where the water in the pit is immersed in the water in the swivel pit at the swirl center of the pit efficiently paints sludge with the water in the pit. Inhale smoothly.

Further, in the second characteristic configuration, water flows in from a position near the outer periphery inside the pit having a circular sectional shape in a plan view in a direction along the tangential direction of the inner peripheral surface of the pit, and the water is accumulated with the inflow hydraulic force. Internal water swirling flow occurs around the vertical axis in the pit, and the swirling flow is maintained.

In the third characteristic structure, by providing the flow path side wall for sludge accumulation, the flow path width is gradually reduced from the separation tank side toward the integration pit side, thereby guiding the flow path side wall. This allows the floating paint sludge in the separation tank to efficiently flow into the accumulation pit in a highly integrated state, and the guided floating paint sludge adheres to and accumulates on the flow path side wall in contact with the flow path side wall. That
This is prevented by supplying and supplying clean water to the inner wall surface of the flow path side wall.

[0013]

[Effects of the Invention] That is, according to the first characteristic configuration of the present invention, regardless of a slight change in the water level in the accumulation pit,
The paint sludge in the accumulation pit can be smoothly and stably inhaled and delivered together with the water in the pit, and only the water in the pit is inhaled and delivered, and the paint sludge is accumulated and accumulated in the accumulation pit. Only sludge is sucked in and sent out with a large amount of air, and it is possible to effectively prevent a situation in which a large amount of air mixed in causes a transport obstacle such as air biting of the pump and a deterioration in the performance of the sludge separation and recovery device in the subsequent process. As a result, as a whole, it became possible to smoothly and stably continue the separation treatment operation of the paint sludge.

Further, since it is possible to allow some fluctuations in the water level in the accumulation pit, and to eliminate the need for a water tank for controlling the water level and auxiliary equipment such as a water level sensor as in the conventional apparatus, the apparatus can be made compact and simple, and the required installation space is required. Can be made smaller and the device cost can be reduced, and there is no adhesion or accumulation of paint sludge on the auxiliary device for water level management.
In addition, the swirling flow effectively prevents the adhesion / accumulation of paint sludge on the inner peripheral surface of the accumulation pit, so that troubles due to the adhesion / accumulation of paint sludge can be prevented, and the frequency and amount of maintenance work required can be reduced. It can be greatly reduced.

If the second characteristic structure of the present invention is adopted, since the swirling flow in the accumulation pit is formed and maintained by utilizing the hydraulic force flowing into the accumulation pit, compared to the case where the swirling flow is formed and maintained with dedicated power. The device cost can be reduced by further simplifying the device configuration and the operating cost.

If the third characteristic constitution of the present invention is adopted, the paint sludge can be efficiently accumulated from the separation tank to the accumulation pit, so that the paint sludge separation treatment from the paint sludge-containing water can be efficiently performed as a whole. Further, since it is possible to prevent the coating sludge from adhering to and depositing on the side wall of the flow path for sludge accumulation, it is possible to avoid a new maintenance work on the side wall of the flow path.

[0017]

EXAMPLES Next, examples will be described.

FIG. 1 shows a coating facility and a paint sludge treatment facility incidental to the coating facility. Reference numeral 1 denotes a coating booth. In the coating booth 1, below the coating chamber 2, there is runoff water W from a downflow pan 3. The paint mist removing device 5 for purifying the exhaust air A by causing the paint mist in the exhaust air A to be captured by the water W by passing the exhaust air A from the coating chamber 2 in a confluent state at high speed through the throttle channel 4. Is provided.

Reference numeral 6 denotes a separation tank for receiving the water W (water containing paint mist) in which the paint mist is trapped on one side of the tank via the flow path 7. In this separation tank 6, the content of the paint contained in the storage process in the tank is Is floated and separated as paint sludge S, and the floated paint sludge S is caused to flow into the accumulation pit 8 together with the water W in the surface layer of the tank through the bottom shallow passage 6a on the other side of the tank.

Paint sludge S accumulated in the accumulation pit 8
Is sucked into the sludge delivery passage 9 together with the water W in the pit and sent by pumping to the sludge separation / collection device 10, while the water W in the lower layer after the paint sludge S has been floated and separated in the separation tank 6. It is returned to the downflow pan 3 in the paint mist removing device 5 by pumping via 11 and reused as water for catching paint mist.

In the sludge separating / collecting apparatus 10, the collecting tank 1
0a and the buoyancy of air bubbles in the sludge effectively cause the paint sludge S to float up and accumulate on the water surface in the tank, and the floated and accumulated paint sludge S is removed to the outside of the tank by the scraping device 10b. It is taken out and collected and sent to an appropriate post-treatment step.

The purified water W after the paint sludge S has been floated and separated in the recovery tank 10a is returned to one side of the separation tank 6 through the flow path 12. It

As shown in FIG. 2, on the other side of the separation tank 6, that is, on the side where the accumulation pits 8 are continuously arranged, sludge accumulation guides are slantly arranged so that the width of the passage becomes smaller toward the accumulation pits 8. The flow path side walls 13 are provided on both sides of the separation tank 6, and by the guide of the flow path side walls 13, the floating paint sludge S in the separation tank 6 is caused to efficiently flow into the accumulation pit 8 in a highly integrated state. There is.

Further, as shown in FIGS. 2 and 4, a plurality of water supply passages 14a are provided for the guide passage side wall 13.
By once colliding the clean water Ws discharged from the collision plate 14b with the collision plate 14b, the clean water Ws after the collision is applied to the inner wall surface of the flow path side wall 13 in a state of being uniformly dispersed over the entire length of the flow path side wall 13. It is equipped with a water discharge device 14 for attaching the floating paint sludge S to be guided.
It is possible to prevent the particles from adhering to and depositing on the side wall 13 of the channel due to contact with the side wall 13 of the channel.

As shown in FIGS. 2 and 3, the integrated pit 8
Is formed into a bottomed cylindrical shape having a circular cross-sectional shape in plan view, while the coating sludge S is fed from the accumulation pit 8 to the pit water W.
The suction port 9a of the sludge delivery passage 9 which is sucked and delivered together is opened upward on the axis of the pit cylinder at the bottom of the pit.

The inlet 15 from the separation tank 6 to the accumulation pit 8 formed at the downstream end of the guide flow path side wall 13 has an inflow water W from the inlet 15 as shown in FIG. Are arranged and formed so as to flow into the integrated pit 8 in a direction along the tangential direction of the inner peripheral surface of the integrated pit from the position near the outer periphery inside the integrated pit, whereby the inflow hydraulic force from the inflow port 15 An internal water swirling flow around the axis of the pit cylinder is formed and maintained in the collecting pit 8.

In other words, by causing the swirling flow described above, the paint sludge S in the accumulation pit 8 is collected in a state of being drawn into the swirling center portion (that is, the pit cylindrical shaft core portion),
As a result, the paint sludge S is efficiently and smoothly sucked together with the water W in the pit through the suction port 9a of the sludge delivery passage 9 arranged at the position where the water is dipped in the water in the turning pit at the turning center.

[Other Embodiments] Next, other embodiments will be listed.

(1) In the above-mentioned embodiment, the inflow hydraulic power of the water W flowing from the inflow port 15 into the accumulation pit 8 is utilized to
Although the swirling flow around the vertical axis is formed in the accumulation pit 8, instead of this, the accumulation pit is formed by means such as rotating the blade body in the water in the pit or rotating the accumulation pit 8 itself. A swirl flow around the axis of the vertical axis may be formed in the swirl 8, and various forms of swirling means for swirling and flowing the internal water W in the accumulation pit 8 around the axis of the vertical axis may be used.
The configuration can be applied.

(2) Further, the inflow water W is made to flow into the integrated pit 8 from a position near the outer circumference inside the integrated pit in a direction along the tangential direction of the inner peripheral surface of the integrated pit, whereby the integrated pit 8 is formed.
A configuration may be adopted in which a plurality of inflow ports 15 that form a swirling flow around the longitudinal axis are provided side by side in the circumferential direction of the integrated pit 8.

(3) The suction port 9a of the sludge delivery passage 9 is
If it is a position where it is immersed in the water in the turning pit at the turning center of the water W in the pit, it can be arranged and formed not only at the bottom of the accumulation pit 8 but also in various positions. In some cases, the suction port 9a is formed at the turning center. The height may be adjustable.

(4) Further, the bottom of the accumulation pit 8 is formed in an inverted conical shape, and the suction port 9 of the sludge delivery passage 9 is formed at the lower top thereof.
You may employ the structure which provides a.

(5) Side wall 13 for guiding sludge accumulation
In the case of providing the water discharge means 14 for discharging and supplying the clean water Ws to the inner wall surface of the above, its specific configuration is not limited to the configuration disclosed in the above-mentioned embodiment,
In addition, various configuration changes are possible.

(6) Side wall 13 for guiding sludge accumulation
The water discharge means 14 for supplying clean water Ws to the
It may be configured by a nozzle in which the water Ws is made into a flat plate shape and directly sprayed onto the inner wall surface of the flow path side wall 13.

(7) A means for blowing water into the pit may be provided so as to accelerate the swirling flow in the accumulation pit 8 or to generate the swirling flow by itself.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

[Fig. 1] Structure diagram of coating equipment and sludge treatment equipment

FIG. 2 is an enlarged view of a plan view.

FIG. 3 is an enlarged vertical sectional view of an integrated pit portion.

FIG. 4 is an enlarged cross-sectional view of a side wall portion of a guide channel.

FIG. 5 is a vertical sectional view showing a conventional example.

FIG. 6 is a plan view showing a conventional example.

FIG. 7 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 6 Separation Tank 8 Accumulation Pit 9 Sludge Delivery Channel 9a Suction Port 13 Flow Path Side Wall 14 Water Discharge Means 15 Inlet S Paint Sludge W Water

Claims (3)

[Claims] 1. A separation tank (6) for inflowing paint sludge-containing water (W) to float and separate the paint sludge (S) during the storage process in the tank, and the floating paint sludge (S) from the separation tank (6). Accumulated pit (8) through which the water flows in together with the water (W) in the surface layer in the tank, and a sludge delivery path (a) through which the paint sludge (S) is sucked and delivered together with the water (W) in the pit from the accumulated pit (8). 9) provided with a swirling means for swirling and flowing the internal water (W) of the accumulation pit (8) around the vertical axis, and the suction port (9) of the sludge delivery passage (9). 9a) is a paint sludge separating device arranged at a position where the water (W) in the pit is swung at the center of swirling and is immersed in the water in the swivel pit. 2. The inflow water (W) from the inlet (15) to the accumulation pit (8) as the turning means.
2. The paint sludge separating apparatus according to claim 1, wherein the paint sludge is arranged so as to flow in a direction along the tangential direction of the inner peripheral surface of the pit from a position near the outer periphery inside the pit having a circular sectional shape in plan view. 3. A flow passage side wall (13) for sludge accumulation guide is provided which gradually reduces the width of the passage from the separation tank (6) side toward the accumulation pit (8) side. The paint sludge separating device according to claim 1 or 2, further comprising water discharge means (14) for discharging and supplying the clean water (Ws) to the inner wall surface of the road side wall (13).