JP4642383B2 - Automatic spraying agent for treatment agent in painting booth - Google Patents

Description

The present invention automatically sprays or supplies a treatment agent to ease bad odor generated when gas generated by evaporation of paint, solvent, etc. used in painting work is exhausted and to purify exhaust gas. It is related with the apparatus to do.

Toxic gases such as organic solvents generated in painting operations are generally processed by a painting booth that collects paint mist and exhausts clean air for the safety and environmental improvement of workers. There are various forms of painting booths depending on the means of collecting mist, but gasified gas is generally exhausted with a bad odor.

There is a deodorizing device as a method for removing harmful gases including bad odors. However, in the case of a deodorizing device accompanying a painting operation, the amount of processing becomes enormous and is limited to a special environment to be economically adopted. In other words, regardless of the standards that are harmful for air pollution prevention or environmental hygiene, unpleasant odors that are uncomfortable to humans are often a problem around the exhausted gas, and even for extremely dilute odorous gases, Its removal is necessary and the efficiency is greatly reduced. Therefore, it is used for the removal of gas with relatively high concentration that can be expected to have a deodorizing effect suitable for places with severe environmental conservation and large-scale investment.

As described above, a method called deodorization is used for the rare gas in which only odor is a problem. Generally, a chemical solution or the like neutralizes the odor that causes human discomfort and deodorizes the gas. Is called. In the case of a paint booth, in addition to the odor of paint, the rot of treated water used for collecting paint mist may be exhausted along with air with odor. There is a strong need for deodorization, including the prevention of odors.

Administration of these deodorizers, chemical treatment agents and the like must be carried out every time or periodically, but automation is desired as a method to be carried out industrially without burdening the operator. As an automatic method, it is possible to apply an existing automatic supply device such as a method of performing administration periodically or by setting a timer for the operation of the painting booth. However, more effective treatments are administered when grasping and supplying them when necessary, and as a public method for spraying deodorants, for example, the flow rate of air during spray coating and air blowing during workpiece cleaning A technique for detecting a difference and spraying a deodorant only at the time of spray coating has been proposed. (Japanese Patent Laid-Open No. 2003-1157)

According to these disclosed technologies, since the deodorizing spray is performed only when the paint is sprayed by the spray gun, that is, the flow rate of the air used is less than the flow rate during the air blow. By utilizing the small amount, the flow rate of both was set in advance, and a signal to spray the deodorant liquid was output only in the case of paint spraying with a low flow rate so as not to waste the deodorant. is there.

These devices use a detection sensor to detect the air flow rate and use a solenoid valve to control the operation of the pump for spraying deodorant, leaving danger in paint sites that handle flammable paints and solvents. ing. In addition, since comparison with air blow is a criterion for spraying deodorant liquid, it is necessary to set and manage the flow rate that is the reference for both, and it is complicated and difficult to maintain proper spraying. is there.
JP2003-1157

The present invention removes offensive odors in the painting booth, improves the work environment or the external ambient environment, efficiently uses deodorants and other necessary treatment agents according to the painting work, and The aim is to obtain equipment that can be used safely in the painting workplace. More specifically, an easy-to-handle device is provided that deodorizes the spray flow of the paint booth by spraying the deodorant according to the spray operation of the paint gun, without using electricity that induces a flammable explosion. .

In the present invention, in order to spray a deodorant without electrical control, a spraying device connected with a processing agent spray supply device operated by compressed air and a supply liquid pipe line is installed in a coating booth. An air-operated control valve that opens when the pressure drops below a preset pressure and closes when the pressure returns to a set pressure or higher is arranged in the air supply path for driving the spray device and operating the spray device. The air branched from the spray air supply path was connected to the operation air input of the control valve, and the supply device was operated when the spray gun was sprayed.

The control valve supplies the operating air of the spraying device with a mechanism that vents when the supplied pressure is below the set pressure by a spring that sets the venting pressure of the operating air pressure, and a valve that opens and closes with the pressure of the operating air・ With a means to stop, open the valve below the set pressure and close when the pressure returns to the set pressure, the spray gun stops spraying and the spraying pressure becomes full pressure, or the operation air pressure when the work is stopped When the supply is stopped, the operating air of the supply device is stopped.

The deodorant is supplied and sprayed from a processing agent supply pump operated by compressed air, preferably by a spray nozzle provided in the exhaust duct of the painting booth. Depending on the form of the painting booth, it is possible to put a deodorant and / or a processing agent such as anti-corruption into the mist processing chamber. It can also be implemented by providing an opening / closing valve on a nozzle for spraying the deodorant and the like sent from the supply device, and controlling the opening / closing with the working air.

According to the present invention, first, in order to perform the operation by air pressure without using electrical detection control, an operation valve or the like for spraying a deodorant or the like, it is possible to handle the paint in an atmosphere where there is a possibility of a flammable explosion. It can be safely used as a deodorant spray device for the painting booth used.

Also, spraying is performed automatically, and only when spraying is performed, the spraying device is operated on the deodorant and the deodorant is sprayed onto the odor exhaust section to deodorize it. It can be stopped and economically prevented. The spray control is simple and stable control can be continued because the air directly branched from the spraying air pressure of the coating gun is used as the control air and can be controlled only by the pressure fluctuation in the spraying operation.

Details will be described based on the embodiment. FIG. 1 is a block diagram showing an example of an apparatus according to an embodiment of the present invention. A coating booth 1 is an apparatus that sucks and collects paint mist that has not been applied to an object to be coated among paints sprayed by a spray gun 2. In general, the air sucked by the exhaust fan and purified air is discharged from the duct 3.
In this case, a part of the organic solvent contained in the paint or paint mist becomes a gas and is exhausted from the duct, causing a problem to the surrounding environment such as odor. A deodorant effective as a method for removing the bad odor of gas is neutralized by spraying an appropriate amount into the exhausted duct 3 to obtain a deodorizing effect. Spraying is performed by providing a nozzle 4 and supplying a deodorant from a supply device 5 provided separately.

The supply device 5 has a typical form, but is not limited thereto. In FIG. 1, a diaphragm pump 7 by air operation is used, a suction pipe 8 is connected from a deodorant container 6 provided separately on the suction side, and a discharge pipe is connected to the nozzle 4 by a supply pipe 9. The operation of the diaphragm pump 7 is driven by the operating air supplied from the air source 10 via the control valve 11.

On the other hand, the spray gun 2 is sprayed by the spray air pressure adjusted by the pressure adjusting valve 12 from the air source 10 through the spray air supply path 13. The control air 15 is branched from the middle of the blowing air supply path 13 supplied to the spray gun 2 and connected to the pilot air inlet of the control valve 11.
The control valve 11 is operated by receiving the pressure of the introduced pilot air. When the pressure becomes lower than the set pressure, the control valve 11 is evacuated to switch the operation and switch the air passage. An example of the configuration is shown in FIG. 2. The screw is adjusted by a balance with the pressure applied to the diaphragm receiving the screw.

2 is provided with an inlet A, an inlet B, and an outlet C. Normally, the inlet A is disconnected from the outlet C by a valve 21, and the inlet B communicates with the outlet C. A piston 22 that opens the valve 21 is provided. The piston 22 is pressed by a diaphragm 23. When compressed air is introduced into the diaphragm chamber 24, the piston 22 operates downward in FIG. A and the outlet C are connected, and the inlet B and the outlet C are shut off.

The diaphragm chamber 24 operates in communication with the chamber 26 of another diaphragm 25. This diaphragm 25 is provided with a setting spring 27 on the opposite side, and is displaced by the pressure introduced into the chamber 26. In addition, an air vent hole 28 is provided at the center of the diaphragm 25 and is closed when the ball 29 is pressed by pressing the setting screw 30 and released when the setting screw 30 is loosened. Since the position of the vent hole 28 is displaced in relation to the diaphragm 25, the vent pressure can be adjusted.
Therefore, when the pilot air introduced into the diaphragm chamber 24 falls below the set value, the spring 27 becomes stronger than the pressure applied to the diaphragm 25, the vent hole 28 is displaced downward, the pilot air is vented, and the diaphragm 23 is exhausted. As a result, the piston 22 is raised, and the inlet B and the outlet C are communicated by the valve 21.

With the above configuration, the compressed air adjusted by the pressure adjusting valve is sent to the spray gun 2 and full pressure is applied at the time of stoppage. In this state, the pilot air branched from the supply path 13 is introduced into the pilot air inlet of FIG. 2, and the pressure entering the diaphragm chamber 24 pushes down the valve 21 by the piston 22 so that the inlet B and the outlet C are blocked. Therefore, the compressed air to the supply device and the spray nozzle is not supplied.

When the spray gun starts spraying, the pressure in the spray air supply path 13 decreases. That is, in the blowing air supply path 13, the pressure drop occurs due to the resistance of the flow path, although it varies depending on the specifications and use conditions of the piping. At this time, the pressure in the diaphragm chamber 24 of the control valve is also reduced, the pressure of the spring 27 is increased, the diaphragm 25 is lowered, the vent hole 28 held by the ball 29 is opened, and the compressed air in the chamber 26 is vented. The pressure in the communicating diaphragm chamber 24 decreases and the piston 22 rises.

Accordingly, the valve 21 rises, shuts off the inlet A and the outlet C, and connects the inlet B and the outlet C. As a result, the diaphragm pump 7 is operated by the compressed air sent from the outlet C to the supply device 5, and supply of the deodorant in the deodorant container 6 to the nozzle 4 is started. At the same time, spraying of the deodorant is started by the nozzle 4. The deodorant is sprayed in the exhaust duct of the painting booth and neutralizes the bad odor contained in the exhaust, and exhausts without discomfort. When the spray gun 2 is stopped, the pressure in the blowing air supply passage 13 rises again, the control valve closes the vent hole 28 to switch the flow path, and shuts off the supply of working air from the outlet C and supplies it. Stop spraying from device 5 and nozzle.

As described above, in the present invention, it is possible to perform spraying by operating the nozzle of the deodorant only at the time of spray coating using the control valve that is switched by the pressure fluctuation in the spray air supply passage 13 by the operation of the spray gun. Therefore, the deodorant can be used efficiently only when spraying the paint which causes bad odor. Moreover, all operations are performed by air and can be used safely.

The deodorant was sprayed into the duct of the painting booth using the apparatus configured as described above, and the effect was confirmed. The diaphragm pump sucks the deodorant in the container by air drive and supplies it to the nozzle by pressure, and a generally known pump capable of adjusting the spray amount by setting the supply pressure is used. Similarly, when the compressed air is supplied to the nozzle, the valve is opened by the operation of an air piston or the like to perform spraying, and an apparatus having the same structure as the spray gun for painting was used.

In the case of FIG. 1, while operating air is sent from the control valve 11 and the pump 7 is operated to supply the deodorant and the atomized air is sent to the nozzle 4 and sprayed, the atomized air is not used. Even if the atomizing nozzle by the supply pressure of the pump is used, the deodorant is always supplied to the nozzle 4 as shown in FIG. 3, and the operation attached to the nozzle 4 by supplying the operating air from the control valve 11 You may comprise so that it may spray by opening a valve by piston 41. FIG. In this case, it is possible to select the spray state by variously developing within the range of the existing technology, such as using the supply air for operation as the atomizing air and using the air atomization type spray gun as the nozzle.

When the spray gun spraying pressure is 300 kilopascals in the actual painting operation, the pressure rises by about 20 kilopascals when the total pressure is applied by stopping. It was confirmed that the accuracy of the control valve can be switched reliably with a difference of 10 kilopascals, and that spraying and stopping of the deodorant is repeatedly performed in conjunction with the ON-OFF operation of the spray gun. If a small spray gun is used and the amount of air used is small and the differential pressure between the stop and spray is small, the pressure effect due to the pipe resistance should be obtained appropriately, such as making the pipe thinner accordingly. Moreover, it is only necessary to make use of existing products such as using a highly accurate control valve.

For example, the deodorizer was sprayed at a rate of 50 cc per minute in a normal coating operation with a liquid diluted 50 times with, for example, F118D # 10 manufactured by Fine Two. As a result of experimentally sucking paint spray particles of about 70 cc per minute into a paint booth operating at a displacement of 100 cubic meters per minute and observing the odor discharged from the exhaust duct, most people smelled It was improved to the extent that I did not feel it. Although the amount of spray varies depending on the paint and conditions used, it can be easily set appropriately by adjusting the nozzle ejection specifications.

In the embodiment of the present invention, since the spray of the deodorant was sprayed in synchronization with the spray of the paint, there was a concern about the problem of the solvent odor exhausted after the stop. Was not felt. If there is an effect due to the duct length or the like, it is possible to set the delay of the deodorant spray by providing a surge tank or the like in the working air piping.

Until now, spraying of deodorant has been mainly described, but the present invention can be used when spraying or spraying other chemicals in conjunction with spray gun spraying. For example, by adding an appropriate anti-corrosion agent to the treated water for mist collection according to spray coating, or by adding an aggregating agent of the incorporated paint, the chemical dosage determined according to the amount of paint used is automatically The proper amount can be supplied.

It is a block diagram showing the outline of one embodiment of the present invention. It is structure sectional drawing of the control valve which switches a flow path with a pressure difference. It is a block diagram which shows the other Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coating booth 2 Spray gun 3 Duct 4 Nozzle 5 Supply apparatus 6 Deodorant container 7 Diaphragm pump 8 Suction pipe 9 Supply pipe 10 Air source 11 Control valve 12 Pressure control valve
13 Blowing air supply path 15 Control air
21 Valve
22 Piston 23 Diaphragm 24 Diaphragm chamber
25 Diaphragm 26 Chamber 27 Spring 28 Vent hole
29 Ball 30 Setting screw 41 Operating piston A, B Inlet C Outlet

Claims (2)

A spray device connected with a processing agent spray supply device that operates with compressed air via a supply liquid line is installed in the painting booth, and the air supply passage that operates the supply device or the spray device drops below a preset pressure. In the painting booth, there is a control valve that opens when the pressure is restored and closes when the pressure returns to the set pressure or higher, and the air branched from the spray air supply path of the spray gun for painting is connected to the operation air input of the control valve. In the processing agent automatic spraying apparatus, the control valve has a valve that opens and closes upon receiving the introduced operation air pressure, and the operation air pressure receives a drag of a spring set in advance. A painting booth that has a mechanism that opens and vents the operating air pressure, opens the valve below the set pressure, and closes when the pressure returns to the set pressure Definitive treatment agent automatic spray device. 2. The processing agent automatic spraying device according to claim 1, wherein the processing agent is a deodorizing agent, and the spraying device includes a processing agent supply pump operated by compressed air and a nozzle for spraying into an exhaust duct of a painting booth.

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