JPH0947701A - Wet coating booth - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To reduce the labor required for cleaning work by making it possible to easily remove the paint even if the paint adheres to the grating which is the floor surface of the coating room, because it does not stick firmly. It is an issue. In a wet coating booth configured such that paint particles oversprayed from a coating machine (4) are brought into contact with water to be collected by the water, the coating chamber (Z) includes: The riser pipe (13) for spraying cleaning water onto the grating (2) spread on the floor is arranged at a position where it does not interfere with the work, and the painting work is interrupted on the riser pipe (13). A cleaning water supply means (15) for supplying water containing a tack-free treatment agent as cleaning water at this time was provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is designed so that paint particles sprayed from a coating machine and oversprayed without adhering to an object to be coated are brought into contact with water to be collected by the water. Wet coating booth.

[0002]

2. Description of the Related Art A coating booth is provided with a dry coating booth for collecting paint particles contained in exhaust gas with a filter, and a venturi portion formed at the bottom of a coating chamber and an exhaust tower. There is a wet coating booth that collects water by bringing it into gas-liquid contact with a washing shower device. this house,
The dry coating booth has the advantage that the equipment is simple and the initial cost is low because it does not require water washing equipment, but the filter is prone to clogging, and if clogging occurs, replace the filter to secure an appropriate exhaust air volume. Since maintenance work must be performed frequently, there is a problem that running costs increase. On the other hand, the wet coating booth has to be equipped with a facility for bringing the paint particles into contact with water in a gas-liquid manner, and thus has the disadvantage of increasing the size and increasing the initial cost, but it removes the paint particles contained in the exhaust gas. Therefore, there is no need for a filter for this, and therefore, there is an advantage that the cost required for maintenance can be reduced because clogging does not occur, and at the same time, it can be used continuously for a long time while maintaining a constant exhaust air volume. .

FIG. 3 shows an example of a Venturi type wet coating booth. For example, a water film plate 33 is formed on one side of a conveyor 31 for transporting an object to be coated W along a transport direction, and a water film plate 33 is formed in a grid pattern. Below the floor formed by the grating 34, a water tank 35 for collecting the water flowing down the water film plate 33.
Are formed. Further, an exhaust tower 37 is formed on the back side of the water film plate 33, a fan 38 is arranged on the upper end side thereof, and a gap between the lower end portion of the water film plate 33 and the water surface of the water tank 35 is a venturi. The water formed in the portion 36 and flowing down the water film plate 33 is atomized in the venturi portion 36 and comes into gas-liquid contact with the paint particles contained in the exhaust gas, and then the water droplets are arranged in the exhaust tower 37. It collides with the baffles 39, 39 and is collected in the water tank 35. After the water in the water tank 35 is filtered by a filter 40 such as a wire mesh,
A water film is formed by being pumped up by a pump 41 and overflowing from an overflow gutter 42 provided above the water film plate 33.

According to this coating booth, the paint particles sprayed from the coater 32 and oversprayed without adhering to the article W are partially collected by the water film flowing on the water film plate 33. At the same time, the remaining part is sucked into the exhaust tower 37 from the venturi part 36 together with the exhaust gas, and is brought into gas-liquid contact with the atomized water in the venturi part 36 to be collected, so that a filter for removing paint particles is unnecessary. Next to
Therefore, since clogging does not occur, the cost required for maintenance can be reduced, and at the same time, it can be used continuously for a long time while maintaining a constant exhaust air volume.

[0005]

However, if the oversprayed paint particles come into contact with the surface of the grating 34 before being sucked into the venturi portion 36 together with the exhaust gas, or if the paint particles fall onto the grating 34 due to the weight of the paint particles, There is a problem in that the paint adheres and deposits on the grating 34, making it difficult to walk and hindering the painting work. For this reason, the grating 34 is cleaned at regular intervals, but the paint adhered to the surface of the grating 34 is firmly adhered and cannot be easily removed. Moreover, the grating 34 is formed on the entire floor surface. There are dozens to dozens of them, and since each piece is made of metal and is quite heavy, cleaning work is very troublesome and time-consuming.

Further, since the painting work cannot be performed while the grating 34 is removed, the cleaning work is performed on a day when the painting work is off. However, when the painting work cannot be interrupted for a long time, the grating 34 is removed. You have to prepare two sets and wash one while using the other,
In this case, there has been a problem that it is necessary to secure a storage space for many cleaned gratings 34 in a limited factory. Therefore, it is a technical object of the present invention to reduce the labor required for cleaning work by making it possible to easily remove the paint even if the paint adheres to the grating so that the paint is not firmly fixed.

[0007]

In order to solve this problem, the present invention is designed to collect paint particles oversprayed from a coating machine by bringing the paint particles into contact with water. In the wet coating booth, in the coating room, a riser pipe for spraying cleaning water against the grating spread on the floor is arranged at a position where it does not interfere with the work, and the coating work is performed on the riser pipe. It is characterized in that it is provided with a wash water supply means for supplying water containing the anti-tacking treatment agent as wash water when interrupted.

According to the present invention, when the painting operation is interrupted, water containing the tack-free treatment agent is sprayed as cleaning water onto the grating, so that the surface of the grating is coated with the tack-free treatment agent. Will be done.
Therefore, the paint particles oversprayed from the coating machine react with the tack-free treatment agent even if they adhere to the grating and are tack-free treated. It hardens to peel off easily. Therefore, the coating which has been made tack-free on the surface of the grating can be easily removed only by rubbing it with a metal brush or giving a light impact.

Even when a large amount of paint adheres from the paint which is hard to peel off,
When the painting work is interrupted, the water containing the anti-adhesion treatment agent in the water tank is repeatedly sprayed as cleaning water, so the anti-adhesion agent contained in the cleaning water makes the coating non-adhesive, and the coating firmly adheres. There is nothing to do. In addition, since the cleaning water is sprayed on the grating when the painting operation is interrupted, even if the water bounces off the grating and scatters around, there is no object to be coated in the coating booth, so the cleaning water does not affect the object to be coated. It does not adhere to cause coating failure.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below based on the embodiments shown in the drawings. FIG. 1 is a front view showing an example of a wet coating booth according to the present invention, and FIG. 2 is a plan view thereof.

In this example, the present invention is applied to a Venturi type wet coating booth 1, in which a water tank 3 is formed under a grating 2 which is a floor surface of a coating room Z, and is oversprayed from a coating machine 4. The paint particles are collected by bringing the water film plate 6 and the Venturi portion 7 into contact with water in a gas-liquid manner. The coating booth 1 has a water film plate 6 formed on one side thereof along the conveying direction of the conveyor 5 that conveys the coating object W, and the back side of the water film plate 6 discharges air from which the paint components have been removed. The exhaust tower 8 is formed. The exhaust tower 8 is provided with an exhaust fan F on the upper end side thereof,
On the lower end side, a venturi part 7 for atomizing the water flowing down the water film plate 6 is formed between the lower end part of the water film plate 6 and the water surface of the water tank 3, and water drops contained in the exhaust gas are formed between them. Baffle plates 9, 9 ... Which are collided and removed are provided.

Further, the grating 2 is a unit type metal sill that is laid on the floor surface, and is formed in a lattice shape so as not to interfere with the exhaust gas flowing from the coating room Z to the underfloor to ensure air permeability. ing. Then, in the water tank 3 formed on the plate of the grating 2, the paint particles collected by the water film are non-adhesive treated to be aggregated and floated or settled as paint residue. The water containing the treating agent is stored, and the water filtered by the filter 10 such as a wire net arranged in the water tank 3 is pumped up by the pump 11 and overflowed on the water film plate 6. The water film is formed by overflowing from the gutter 12. On the other hand, in the coating chamber Z, a riser pipe 13 for spraying cleaning water onto the grating 2 is arranged at a position that does not interfere with work, such as near the wall surface on the back side of the operator, and Reference numeral 13 is connected to the water tank 3 via a cleaning water supply pipe 14 having a pump (cleaning water supply means) 15 interposed therein.

Reference numeral 16 denotes a drive control device for activating the pump 15 when the coating work is interrupted to supply the water containing the detackifying treatment agent in the water tank 3 as cleaning water, and to the input side thereof. , A synchronous pulse oscillator 18 that generates a pulse in synchronization with the movement of the conveyor 5, and an optical sensor 1 that is installed at the entrance of the coating chamber Z and detects that the article W to be coated has been loaded.
9 is connected to a switch 20 for confirming and operating the presence or absence of an operator. The pulse signal input from the synchronous pulse oscillator 18 is used to identify whether the conveyor 5 is stopped or not. Whether or not there is an object W to be coated in the coating room Z is discriminated from the detection signal and the pulse signal, and it is judged from the switch signal from the switch 20 that there is no worker in the coating room Z. Then, when the conveyor 5 is stopped and it is determined that there is no object W to be coated in the coating chamber Z and there is no worker, the pump 15 is started for a certain period of time to flow the water in the water tank 3 to the riser pipe. 13 and the water containing the tack-free treatment agent is sprayed onto the grating 2.

Reference numeral 21 is a replenishment port for replenishing the anti-tackifying agent in the water tank 3, which is formed on the inlet side of the pump 15 and is activated by pouring the pump 15 into the water tank 3. , The grating 2 from the riser pipe 13
After being sprayed on, it flows into the water tank 3 and is replenished.

The above is an example of the configuration of the present invention, and its operation will be described below. First, when the main switch (not shown) is turned on before the start of coating, the pump 11 rotates,
The water in the water tank 3 is circulated and supplied to the overflow gutter 12 to form a water film on the water film plate 6. When it is confirmed that there is no worker in the coating room Z and the switch 20 is operated, at this time, since the conveyor 5 is still stopped, there is no pulse signal input from the synchronous pulse oscillator 18, and the optical sensor 19 Also, since there is no input of the detection signal of the object W to be coated, it is judged that there is no object W to be coated in the coating chamber Z, and the pump 1
5 is operated for a fixed time (for example, 5 minutes), and the water in the water tank 3 filtered by the filter 10 is sprayed from the riser pipe 13 onto the grating 2, so that the grating 2 is coated with the anti-tacking agent. . Even if the tack-free treatment agent dries on the surface of the grating 2, when the paint adheres, it reacts with the paint and the paint is tack-free treated.

When the coating is started here, of the coating particles sprayed from the coating machine 4, those which have not been adhered to the object W to be coated due to overspray rise up in the coating chamber Z,
Part of the paint is collected by the water film flowing on the water film plate 6, and the paint particles not collected by the water film flow toward the Venturi section 7 along with the flow of the exhaust gas, or on the grating 2 due to its own weight. To fall. At this time, the paint particles that have come into contact with the surface of the grating 2 or have fallen onto the grating 2 before being sucked into the venturi part 7 are
However, since the surface of the grating 2 is coated with the anti-adhesion treating agent, the paint reacts with the anti-adhesion treating agent and is easily de-adhered so that the paint is easily adhered to the surface of the grating 2. Does not stick firmly.

Even if the switch 20 is erroneously operated during the coating work, the synchronous pulse oscillator 18 outputs a pulse signal because the conveyor 5 is moving at that time, and the object W to be coated is placed in the coating chamber Z. Since the detection signal is output from the optical sensor 19 every time it is loaded into the container, the pump 15 is not started, and therefore, the cleaning water does not spout from the riser pipe 13 during coating and a coating failure does not occur. Further, even when the conveyor 5 is stopped, when it is determined that the object W to be coated, which has been finally brought into the coating chamber Z, is inside the coating chamber Z, that is, the optical sensor 19 coats the object W to be coated. When it is detected that the workpiece W has been loaded into the chamber Z, and the pulse signal sufficient for the workpiece W to pass through the coating chamber Z is not output from the synchronous pulse oscillator 18, the workpiece W is placed in the coating chamber Z. As a result, it is determined that the cleaning water is not sprayed onto the grating 2 even if the switch 20 is operated.

Then, for example, when finishing the coating of the last article W to be coated in the morning and taking a lunch break for about one hour, all the articles W are carried out of the coating chamber Z, and the conveyor 5 is moved. When the switch 20 is operated after confirming that there is no worker in the coating room Z in the stopped state, the pump 15 is started and the cleaning water is sprayed from the riser pipe 13 to the grating 2. In this way, the tack-free treatment agent is repeatedly sprayed on the surface of the grating 2 every time the coating operation is interrupted, so that even if a large amount of paint adheres, the paint is tack-free and easily peels off. Set in.

Then, after a predetermined period of use, the paint is coated with a grating 2 by rubbing it with a metal brush or applying a light impact.
Since it is hardened in a state where it can be easily peeled off, it can be easily removed. Furthermore, when replenishing the water-free tank 3 with the tack-free treatment agent, it may be poured from the replenishing port 21 while the pump 15 is activated. In this case, the tack-free treatment agent is supplied from the riser pipe 13 to the grating 2 After being sprayed on, the water tank 3 is replenished.

As described above, the anti-tackifying agent is repeatedly sprayed on the grating 2, and the paint adhering to the surface of the coating 2 can be easily removed because it is hard to be peeled off without being firmly fixed. You can continue to use it without removing the grating 2 for a period of time, even when removing the grating 2 from the floor surface for cleaning.
The paint is not solidified on the surface, so it can be easily removed.

In the above description of the embodiment, the case where the present invention is applied to a simple wet coating booth that guides exhaust gas to the side has been described. However, like a tunnel coating booth for coating an automobile body, the ceiling of a coating chamber is used. Wet coating booth of the type that sucks the conditioned air supplied from
It can be applied to any conventionally known wet coating booth. Further, the means for bringing the paint particles into gas-liquid contact with water is not limited to the Venturi method, but a washing shower method of spraying water with a riser pipe, or water flowing down a wire mesh arranged in the exhaust tower, and the exhaust gas Conventionally known gas-liquid contacting means such as a tray gas-liquid contacting method in which gas-liquid contact is made when passing through a wire net can be adopted.

Further, the case where the pump 11 for feeding the water in the water tank 3 to the overflow gutter 12 and the pump 15 for feeding the water to the riser pipe 13 are individually provided has been described, but one pump can be used as well. Alternatively, an on / off valve may be provided in the cleaning water supply pipe 14 so that the valve is opened for a certain period of time when the painting operation is interrupted. Furthermore, the cleaning water sprayed on the grating 2 is not limited to the case of using the water in the water tank in which the tack-free treatment agent is mixed, and the tack-free treatment agent to be replenished in the water tank may be directly sprayed to the grating 2. You may

[0023]

As described above, according to the present invention, water containing a detackifying treatment agent is repeatedly sprayed as a cleaning agent from a riser pipe onto a grating attached to a floor surface, and the coating material adhered to the surface thereof. Since it is hard to peel off without sticking firmly, it can be easily removed by rubbing with a metal brush or applying a light shock while the grating is attached to the floor surface, so remove the grating for a long time It has a very excellent effect that it can be continuously used without being used, and that even when it is removed and washed, the paint adhered to the surface thereof does not harden, so that the labor required for the washing operation can be remarkably reduced.

[Brief description of drawings]

FIG. 1 is a front view of a wet coating booth according to the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is a front view showing a conventional device.

[Explanation of symbols]

 1 ... Wet coating booth Z ... Painting room 2 ... Grating 3 ... Water tank 4 ... Coating machine 5 ... Conveyor 6 ... Water film plate 13 ... Riser pipe 14 ...・ Cleaning water supply pipe 15 ... Pump (cleaning water supply means) 16 ... Drive control device

Claims (1)

[Claims] 1. A wet coating booth configured to collect paint particles oversprayed from a coating machine (4) by contacting the gas with water to form a wet coating booth in the coating chamber (Z). , The riser pipe (13) for spraying cleaning water onto the grating (2) spread on the floor is arranged at a position where it does not interfere with the work, and the painting work is interrupted on the riser pipe (13). A wet coating booth comprising a cleaning water supply means (15) for supplying water containing an anti-tacking treatment agent as cleaning water when the cleaning is performed.