JPH11244772A - Applicator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently remove sludge at a low cost with the generation of bubbles controlled by forming the amount of a killer agent to be supplied from a killer agent supply adjusting means to a sludge pool automatically adjustably corresponding to a coating operation implementation condition detected by a coating operation implementation condition detecting means. SOLUTION: A coating operation implementation condition detecting means UNT for detecting a coating operation implementation condition in a coating booth, killer agent supply adjusting means 35, 36, 36D which was formed so as to enable to adjust the supply of a killer agent to a sludge pool 20 continuously or intermittently, and supply adjusting/controlling means 51, 52 are provided. Corresponding to a coating operation implementation condition detected by the means UNT, the amount of the killer agent to be supplied from the means 35, 36, 36D to the sludge pool 20 is formed automatically adjustably. In this way, the killer agent in a proper amount corresponding to the operation/stop of coating, the variation of a coating load, and others can be supplied automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for recovering paint mist-containing wastewater from a painting booth for painting a work to a sludge pool and supplying a killer agent in the sludge pool to promote the granulation of sludge. The present invention relates to a coating device formed to be capable of removing sludge.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional coating apparatus. In the coating booth 10, a downstream air flow is formed from the upper static pressure chamber to the lower drainage collection unit 14, and the work (object to be coated) W is transported by a conveyor in a predetermined direction (perpendicular to the paper in FIG. 4). ) Is conveyed continuously or intermittently. Paint is sprayed onto the work W, for example, from a robot type coating machine 15 to apply the paint.

[0003] The paint mist at this time rides downstream, is captured by the water film flow on the water film forming plate 12, and is collected as a paint mist-containing wastewater by the wastewater collecting part 14. The water film forming liquid is supplied from the water supply gutters 13 on both sides.
The liquid for forming a water film circulates and uses a part of the liquid in the sludge pool 20.

[0004] The collected paint mist-containing wastewater Q is collected in a sludge pool 20 and supplied to a chemical replenishing means 3.
Granulation of the sludge is promoted by the action of the killer agent replenished from the killer agent tank 31 and the sludge-containing liquid Q
Becomes

[0005] The killer agent is primarily a chemical agent for reducing the adhesiveness of the paint (for example, JP-A-1-16447).
No. 2). In FIG. 4, reference numeral 32 denotes a caustic soda tank for neutralization, and reference numeral 33 denotes a defoamer tank.

[0006] The sludge-containing wastewater Q whose granulation has been promoted is
The water is pumped by the pump 23 and supplied to the centrifugal separator 40. The separated sludge S is discarded using the lower carriage 45, and the separated liquid (Q) is returned to the sludge pool 20.

In the case where the killer agent is of the floating type instead of the sedimentation type, the suction port 22 of the pump 23 is provided near the liquid surface.
The essence of sludge treatment does not change.

By the way, since the paint mist has relatively high tackiness and the killer is a kind of surfactant,
Bubble B on the surface of the sludge-containing liquid Q in the sludge pool 20
Is easy to occur. The larger the difference between the height of the painting booth 10 and the sludge pool 20 (for example, 20 meters), the more vigorously generated. If this is left unchecked, problems such as scattering to the surroundings occur, which is not preferable from an environmental problem.

Therefore, in order to minimize the generation and growth of bubbles B, it is preferable to replenish the killer agent according to the situation while monitoring the sludge pool 20. However, since the sludge pool 20 and the painting booth 10 are often 100 meters apart, for example, it is difficult to grasp the painting operation status, the time lag is large, and the burden of dedicated staffing is large. Reasonable operation is very difficult.

Therefore, conventionally, from the viewpoint of improving sludge capture efficiency as the primary purpose, when the coating booth 10 is being started (formation of a downstream, formation of a water film by liquid circulation), the killer is always stopped. The operation of continuously supplying the agent to the sludge pool 20 is being attempted.

[0011]

However, according to the conventional method based on this concept, the continuous and continuous replenishment amount of the killer agent tends to increase. Thus, the opportunity to administer the antifoam increases and the dosage increases. When the painting booth 10 is activated and the painting operation is not being performed or the painting load is small, regardless of the original purpose of sludge removal, the generation of foam B is promoted and the use of an antifoaming agent is suppressed. There is a strong possibility that such a situation will be contradictory both logically and practically. This not only raises the cost of coating but also is environmentally unfriendly.

An object of the present invention is to provide a coating apparatus capable of removing sludge at a high efficiency and at a low cost while suppressing the generation of bubbles by minimizing the supply of a killer agent in accordance with the specific situation of the coating operation. Is to do.

[0013]

SUMMARY OF THE INVENTION According to the present invention, a paint mist containing wastewater from a paint booth for painting a work is collected in a sludge pool, and a killer agent is supplied in the sludge pool to granulate the paint mist. In a coating apparatus formed so as to be capable of removing sludge while accelerating, a coating operation execution state detecting means for detecting a coating operation execution state in the coating booth, and adjusting the supply of the killer agent to the sludge pool continuously or intermittently. A killer agent replenishment adjusting means formed so as to be capable of automatically adjusting the amount of the killer agent replenishment to the sludge pool from the killer agent replenishment adjusting means according to the coating operation state detected by the coating operation state detecting means. This is a coating device formed in

In this invention, the painting operation state detecting means always detects the painting operation state in the painting booth, for example, always. Then, the killer agent replenishment adjusting means automatically adjusts the replenishment amount of the killer agent to be supplied to the sludge pool to an optimum replenishment amount according to the painting operation execution state detected by the painting operation execution state detecting means. Therefore, if the killer agent replenishment adjusting means is set so that the amount of the killer agent can be continuously or intermittently adjusted in the sludge pool according to the painting operation (painting load, etc.), the operation of the coating can be started / stopped. It is possible to automatically replenish an appropriate amount of a killer agent without excess or deficiency according to the fluctuation of the paint load and the like.

Therefore, sludge can be removed at a high efficiency and at a low cost while suppressing the generation of bubbles by minimizing the supply of a killer agent in accordance with the specific situation of the painting operation. It can be wiped out and the opportunity and dose of administration of the antifoam can be minimized.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the entire configuration of an embodiment of the present invention, FIG. 2 is a side view of a coating booth, and FIG. 3 is a timing chart for explaining an example of supply adjustment of a killer agent.

This coating apparatus has the same basic configuration and functions as those of the conventional example (FIG. 4).
A coating operation execution state detecting means (15UNT) for detecting a coating operation execution state within 0; and a replenishing killer agent supply adjusting means (35) formed so that the supply of the killer agent to the sludge pool 20 can be adjusted continuously or intermittently. , 36, 36D),
Supply adjustment control means (51, 52); killer agent supply adjustment means (35, 36, 3) in accordance with the coating operation state detected by the coating operation state detection means (15UNT).
6D), the amount of the killer agent supplied to the sludge pool 20 can be automatically adjusted.

Parts common to those in the conventional example (FIG. 4) are denoted by the same reference numerals, and description of those parts is simplified or omitted.

In FIG. 2, a setting room 18 is provided on the near side (right side in FIG. 2) of the painting booth 10 and on the front side (left side).
Is provided with a preheat furnace 19. In the painting booth 10, a plurality of robotic automatic painting machines 15 are provided. Each robot-type automatic coating machine 15 can apply a water-soluble paint to a work (vehicle) W which is continuously or intermittently transported in the transport direction X by the transport conveyor 16 and via the carriage to apply the coating. .

Prior to the coating operation, the downstream and the liquid circulation, that is, the coating booth 10 is to be started (started up).

In FIG. 1, in this embodiment, a drive control panel 50 includes a control unit (CPU 51, ROM 52, R
AM53), keyboard (KB) 54, display (IN
D) 55, input / output ports (I / O) 56, 57, interface (I / F) 58 for coating machine control panel 15 UNT
And an interface (I / F) 59 for the transport conveyer control panel 16UNT so that the entire coating apparatus can be driven and controlled by an appropriate amount in a timely manner. Note that equipment for downstream, liquid circulation, and the like are not shown.

The coating machine control panel 15UNT includes a control unit (5
1, 52, 53), the driving of each coating machine 15 can be controlled. Also, this coating machine control panel 15UNT
Can also detect the number of painting machines 15 and the painting load that are actually being driven at that time. That is, a specific painting operation execution state is detected from the painting state actually applied to the workpiece W, and a painting operation execution state detection signal S15 corresponding to the detected painting operation execution state is output to the control unit (51, 52, 53). can do.

The transport conveyer control panel 16UNT can control the drive of the transport conveyer 16 based on a command from the control section (51, 52, 53). The transport conveyor control panel 16UNT can detect the actual transport speed and transport mode (continuous or intermittent) of the transport conveyor 16 at that time. In other words, the painting operation execution state is detected from the transfer state of the workpiece W, and the painting operation execution state detection signal S16 corresponding to the detected painting operation execution state is transmitted to the control unit (51, 52, 52).
53).

That is, in this embodiment, the coating operation execution state detecting means for detecting the coating operation execution state in the coating booth 10 is formed from the coating machine control panel 15UNT and the transport conveyor control panel 16UNT. In consideration of the form of the work W, the type of coating, and the like, any one of them can be selectively used. This selection is made by the display 55
Is performed using the keyboard 54 while visually confirming the above.

The coating operation execution state detecting means includes a coating machine control panel 15UNT and a transport conveyor control panel 16UNT.
A control unit for adding a drive control signal to T (51, 52, 53)
Of the drive control program stored in the ROM 52
The progress of the coating operation may be detected indirectly using the progress.

That is, the coating operation execution state detecting means includes killer agent supply adjusting means (35, 36, 3) for adjusting the supply of the killer agent to the sludge pool 20 continuously or intermittently.
What is necessary is just to select suitably from the relationship with the structure and function of 6D).

In this embodiment, the killer agent replenishment adjusting means is formed by the solenoid circuit 36D shown in FIG. 1 and the on-off valve 35 with the solenoid, and when the excitation (opening) signal S1 of the solenoid 36 is inputted, the on-off valve is opened. 35 is opened so that the killer agent can be automatically replenished from the killer agent tank 31 to the sludge pool 20. In this connection, the coating operation execution state detecting means is turned ON-OFF as shown in FIG. A method of outputting a painting operation execution state detection signal S15 (S16) as a signal was adopted.

Further, in this embodiment, in order to enable more appropriate automatic replenishment of the replenishment amount, replenishment adjustment control means (CPU 51, ROM 52) is provided, and FIG.
As shown in (B), the painting operation execution state detection signal S15
When the set operation time T has elapsed since the output of (S16), the solenoid 36 is excited (O
N) It is formed to output the signal S1.

The set operation time T and the set replenishment time t
Are managed by a clock circuit built in the CPU 51, and each value can be set and changed using a keyboard 54.

As shown in FIG. 3C, the excitation (ON) signal S1 is formed so as to be continuously output during the period in which the painting operation execution state detection signal S15 (S16) is being output. Is also good. In this case, the diameter of the on-off valve 35 is changed as shown in FIG.
It should be smaller than in case (B).

It is to be noted that the killer agent replenishment adjusting means comprises, for example, a logic circuit or the like, and the valve (35) is a flow rate adjusting valve.
Output the opening degree adjustment signal (S1) proportional to the time length of (S16) or the level of the signal level to automatically adjust the supply amount of the killer agent while adjusting the opening degree of the flow control valve, and the like. It can also be implemented as the configuration of In this way, the same replenishment amount can be adjusted without directly providing the replenishment adjustment control means (CPU 51, ROM 52).

According to the coating apparatus of this embodiment, the coating booth 10 is started. Downstream is established,
A water film is formed on the water film forming plate 12 by the liquid circulation. That is, the standby state of the painting operation is established.

At this stage, since the coating operation execution state detection means (coating machine control panel 15UNT) does not output the coating operation execution state detection signal S15, the supply adjustment control means (CPU 51, ROM 52) and the killer agent supply adjustment means ( 35, 36, 36D) do not work. That is, the sludge pool 20 is not replenished with an extra killer agent.

Therefore, even if the liquid circulation is performed by driving the pump 23, or even if the wastewater containing the paint mist vigorously flows from the painting booth 10 at a high place to the sludge pool 20 at a low place, the excess of the killer agent Since it is not in a state, generation of bubbles B is very small. Therefore, it is not necessary to administer an antifoaming agent. Environmentally friendly.

In response to the operation command, the control units (51, 52, 5)
3) The coating machine control panel 15UNT and the conveyor control panel 16U are connected via the respective interfaces (I / F) 58 and 59.
A drive control signal is given to NT.

The transport conveyer control panel 16UNT drives and controls the transport conveyer 16 to start transporting the workpiece W in the transport direction X. After the start of this transfer, the coating machine control panel 15UNT
However, the drive control of each robot-type coating machine 15 causes each machine (15) to apply a predetermined pattern to the work W that has reached (elapsed) the corresponding area.

Here, the painting operation execution state detection signal S15 is output from the painting operation execution state detection means (coating machine control panel 15UNT) selected in this embodiment. Then, the replenishment adjustment control means (CPU 51, ROM 52)
The counting of the elapsed time corresponding to the set operation time T shown in FIG. During this time, wastewater containing paint mist is
It is flowing to a sludge pool 20 far away from the painting booth 10.

Thus, when the elapsed time becomes equal to the set operation time T, the solenoid circuit 36
An excitation (ON) signal S1 is output to D. Therefore,
The solenoid 36 forming the killer agent replenishment adjusting means together with the solenoid circuit 36D is excited, and the on-off valve 35
Open only for the set replenishment time t in (B). That is, the killer agent is adjusted and supplied to the sludge pool 20.

At this time, the paint mist-containing wastewater from the painting booth 10 flows into the sludge pool 20. Therefore, the killer agent efficiently promotes the granulation of the sludge in the wastewater. Since the killer agent corresponding to the amount of paint mist-containing wastewater flowing in the set operation time T is supplied, the generation of bubbles B can be minimized.

If the coating operation is continued, the supply adjustment control means (CPU 51, ROM 52) counts the elapsed time again after the set supply time t has elapsed as shown in FIG. When it becomes equal to the operation time T, the killer agent is supplied again for the set supply time t.

[0041]

According to the present invention, the supply amount of the killer agent to the sludge pool can be automatically adjusted from the killer agent supply adjusting means in accordance with the painting operation state detected by the painting operation state detecting means. Since it is a coating apparatus, it is possible to automatically replenish the killer agent without any excess or deficiency according to the start / stop of the coating, the fluctuation of the coating load, and the like. Therefore,
By minimizing the supply of killer agent according to the situation of painting operation, it is possible to remove sludge at high efficiency and at low cost while suppressing the generation of foam, and it is possible to eliminate the monitoring staff of the sludge pool and to remove the defoamer. Dosage opportunities and dosages can also be minimized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of an embodiment of the present invention.

FIG. 2 is a side view of the painting booth.

FIG. 3 is a timing chart for explaining an example of supply adjustment of a killer agent.

FIG. 4 is a diagram for explaining a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Painting booth 15 Robot type coating machine 15UNT Painting control panel (painting operation state detection means) 16 Conveyor 16UNT Transport conveyor control panel (painting operation state detection means) 20 Sludge pool 30 Chemical replenishment means 31 Killer agent tank 35 Open / close valve (Killer agent supply adjusting means) 36 Solenoid (killer agent supply adjusting means) 36D solenoid circuit (killer agent supply adjusting means) 40 Centrifuge 50 Drive control board 51 CPU 52 ROM 53 RAM 54 Keyboard 55 Display B Bubble Q Sludge ( Wastewater containing paint mist) S Sludge W Work X Work transfer direction

Claims (1)

[Claims] A sludge pool is formed so that wastewater containing paint mist from a painting booth for painting a work is collected in a sludge pool and a killer agent is supplied in the sludge pool to promote granulation of sludge and remove sludge. A coating operation execution state detecting means for detecting a coating operation execution state in the coating booth; and a killer agent supply adjustment formed so as to be capable of adjusting the supply of the killer agent to the sludge pool continuously or intermittently. Means for automatically adjusting the supply amount of the killer agent to the sludge pool from the killer agent supply adjusting unit according to the coating operation state detected by the coating operation state detection unit.