WO2021033760A1

WO2021033760A1 - Removal system

Info

Publication number: WO2021033760A1
Application number: PCT/JP2020/031551
Authority: WO
Inventors: 石田浩三; 小池俊彦; 中島寿雄; 崎田賢治; 三輪朋孝
Original assignee: 株式会社大気社
Priority date: 2019-08-21
Filing date: 2020-08-21
Publication date: 2021-02-25
Also published as: JP6931429B2; JPWO2021033760A1

Abstract

Provided is a removal system capable of reducing running costs by using a dry-type filter material. A removal system 20 for mist-like paint contained in the exhaust of a painting booth 12 comprises: a ventilator 32 that sucks in air that is inside the painting booth 12; a dry-type filter material 23 that is disposed between the painting booth 12 and ventilator 32, allows air, sucked in by the ventilator 32 from the painting booth 12, to pass therethrough, and captures mist-like paint contained in that air; and a separation mechanism 36 that separates, from the filter material 23, paint sediment that has formed from the mist-like paint captured by the dry-type filter material 23.

Description

Removal system

The present invention relates to a system for removing mist-like paint contained in the exhaust of a painting booth.

In painting equipment where automobile painting, parts painting, and other general painting is performed, the painting object was sprayed for painting at the painting booth where the painting target is spray-painted, but it did not adhere to the painting target. A removal system is provided to collect the mist-like paint.

As disclosed in Patent Document 1, a conventional removal system collects a filter by circulating an endless belt-like filter (filter medium) between a collection space and a removal action position. The exhaust from the painting booth is filtered at the part that moves in the collection space to collect the mist-like paint in the exhaust, and the collected mist-like paint is removed from the filter by cleaning when moving the removal action position. , It is configured to remove mist-like paint in the exhaust from the painting booth.

By the way, since the mist-like paint strongly adheres to the surface of the filter due to its adhesive force, in the removal system disclosed in Patent Document 1, the mist-like paint is moved in the cleaning liquid at the removal action position and adheres to the filter. By cleaning the constituent paint slag, clogging of the filter is eliminated.

However, cleaning the filter using the cleaning liquid consumes a large amount of water, and it is necessary to treat the wastewater to a standard suitable for the environment, and improvement is required in that the running cost is high.

Japanese Unexamined Patent Publication No. 07-400143

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a removal system capable of reducing running costs by using a dry filter medium.

The feature configuration of the removal system according to the present invention for achieving the above object is a removal system for mist-like paint contained in the exhaust of the painting booth, the blower sucking the air in the painting booth, and the painting booth. A dry filter medium that is arranged between the air and the blower, ventilates the air sucked into the blower from the painting booth, and collects the mist-like paint contained in the air, and is collected by the filter medium. The point is that it is provided with a separation mechanism for separating the paint slag composed of the mist-like paint from the filter medium.

According to the above configuration, the paint residue collected on the dry filter medium can be easily separated by the separation mechanism. Since a dry filter medium is used in the removal system, it is not necessary to configure a cleaning tank or the like as in the case of using a wet filter medium, so that the space of the separation booth can be saved. It is possible to lower the floor of the painting booth. Cost reduction is also possible because the degree of freedom in the layout of the painting booth is increased.

Since equipment such as a pump that injects washing water is not required as in the case of using a wet filter medium, energy saving is possible, and as in the case of using a wet filter medium for waste from a separation booth. In addition, since cleaning drainage is not generated, running costs can be reduced.

It is preferable that the separation mechanism is provided with a laser blasting means or a dry ice blasting means.

The laser blasting means is configured to emit laser light from a laser oscillator with respect to the paint residue collected on the filter medium. The paint residue irradiated with the laser beam is instantly melted, evaporated, and thermally destroyed and separated from the filter medium.

Further, the dry ice blasting means is configured to inject granular dry ice from a nozzle with compressed air and collide with a paint residue adhering to a filter medium. The collision of dry ice sprayed at high speed causes the paint residue to heat shrink, causing minute cracks at its interface to reduce its adhesive strength, and the dry ice that has entered the gap between the paint residue and the filter medium sublimates. The paint slag is separated from the filter media, sometimes as the volume expands.

In the present invention, it is preferable that the separation mechanism is provided with a physical means that physically acts on the paint residue.

According to the above configuration, the separation mechanism can separate the paint residue from the filter medium by the physical action of physical means.

For example, in the above-mentioned laser blasting means and dry ice blasting means, the paint slag is separated instantaneously, but according to the laser blasting means, a local physical change occurs in the irradiated portion of the laser beam, and the dry ice is dried. According to the blasting means, a local physical change occurs in the impacted portion of the dry ice. Therefore, the laser blasting means and the dry ice blasting means can function as physical means.

Other physical means include scraping of paint slag by contact with a scraper and peeling means such as spraying high-pressure fluid onto the paint slag.

The physical means is not limited to one that exerts only a physical action on the paint residue, and can exert other actions, for example, a thermal action described later, in addition to the physical action. May be good.

In the present invention, it is preferable that the separation mechanism is provided with a thermal means that thermally acts on the paint residue.

According to the above configuration, the separation mechanism can easily reduce the adhesive force of the paint residue adhered to the filter medium by the thermal action by the thermal means, so that the adhesive force of the paint residue remains strong. Compared with the case where the paint residue is separated from the filter medium, the paint residue can be easily separated from the filter medium.

As the thermal means, heating means and cooling means can be preferably exemplified. The heating means is configured to heat the paint residue adhering to the filter medium by conduction, convection, or radiation, such as a halogen heater or an induction heater. As a result, the paint residue is heat-cured and its adhesive strength is reduced.

The cooling means is configured to cool the paint slag adhering to the filter medium by conduction, convection, or radiation, such as an ultra-low temperature roller, ultra-low temperature air cooling, and ultra-low temperature gas spraying. As a result, the paint residue is cooled and solidified (vitrified), and its adhesive strength is reduced.

The thermal means is not limited to one that exerts only a thermal action on the paint residue, and may be one that can exert other actions, for example, a physical action, in addition to the thermal action. ..

That is, in the laser blasting means and the dry ice blasting means, the paint slag is separated instantaneously, but according to the laser blasting means, the temperature rises locally and rapidly on the irradiated portion of the laser beam, and the dry ice blasting is performed. According to the means, a local and rapid temperature drop can occur at the impacted part of the dry ice. Therefore, the laser blasting means and the dry ice blasting means can also function as thermal means.

In the present invention, it is preferable that the separation mechanism is provided with a curing and solidifying means for heat-curing or cooling-solidifying the paint residue.

According to the above configuration, the separation mechanism can heat-cure or cool-solidify the paint slag adhering to the filter medium by the curing and solidifying means to reduce the adhesive force, so that the adhesive force of the paint slag is strong. As it is, the paint slag can be easily separated from the filter medium as compared with the case where the paint slag is separated from the filter medium.

The curing and solidifying means may be one capable of heat-curing or cooling-solidifying the paint residue and exerting other actions, for example, a thermal action. Therefore, as the curing and solidifying means, the above-mentioned heating means and cooling means can be exemplified.

The paint residue may be heat-cured or cooled and solidified by a curing and solidifying means, and then the paint residue may be separated from the filter medium by a physical means, for example, a peeling means as described above.

In the present invention, it is preferable that the separation mechanism includes a vibration applying means for separating the paint residue from the filter medium by vibrating the filter medium.

According to the above configuration, the separation mechanism can separate the paint residue from the filter medium by vibrating the filter medium by the vibration applying means.

In the present invention, the filter medium is configured in the shape of an endless belt wound around a plurality of rotating rollers, and is provided with a roller drive mechanism for driving at least one of the plurality of rotating rollers. Is suitable.

According to the above configuration, since the filter medium is formed in the shape of an endless belt, the filter medium can be used by circulating it between the paint collecting area and the coating separating area. In addition, when constructing the filter medium into an endless belt shape, it is natural that one sheet is formed in an endless shape by connecting both ends, and the paint collection area and the paint separation area are formed while a plurality of sheets are arranged in an endless shape. Also includes those configured to be cyclically moved. As such a configuration, an example can be exemplified in which a plurality of panel filters are arranged without a gap along the moving direction. The panel filter is a frame in which a filter medium is held.

In the present invention, the differential pressure detecting unit capable of detecting the pressure difference between the primary side and the secondary side of the filter medium and the rotating roller by the roller driving mechanism according to the pressure difference detected by the differential pressure detecting unit. It is preferable that a drive control mechanism for changing the rotation speed of the vehicle is provided.

According to the above configuration, when the pressure loss of the filter medium exceeds a predetermined value, the drive control mechanism can increase the rotation speed of the rotating roller to increase the moving speed of the filter medium and promptly promote the separation of the paint slag from the filter medium. It becomes.

The drive control mechanism can change the rotation speed of the rotating roller according to the situation of spray painting on the object to be coated in the painting booth. It is also possible to control the rotating roller to stop when the painting booth is not painted. The drive control mechanism can also control the movement and stop of the rotating roller in conjunction with the movement and stop of the object to be conveyed conveyor and the coating machine.

In the present invention, the filter medium is composed of a plurality of sheets, and each of the filter media has a paint collection region for collecting the mist-like paint by the filter medium and a paint separation region for separating the paint residue from the filter medium. The moving mechanism is provided, and the moving mechanism moves the filter media adjacent to each other in the paint collecting region in a state of being arranged without a gap along the moving direction, and the moving mechanism is adjacent to the paint separating region. It is preferable that the filter medium is configured to move in a state where a gap is formed along the moving direction.

Although it is a plurality of filter media, it can be used like an endless belt-shaped filter medium in a section where mist-like paint is collected. In addition, unlike the panel filter described above, in the coating separation region, each filter medium can be moved depending on the mode in which there is a gap between adjacent ones. Therefore, the number of filter media can be reduced as compared with the example of the panel filter in which the paint collecting area and the paint separating area are circulated and moved while being arranged in an endless manner.

In the present invention, the differential pressure detecting unit capable of detecting the pressure difference between the primary side and the secondary side of the filter medium and the moving of the filter medium by the moving mechanism according to the pressure difference detected by the differential pressure detecting unit. It is preferable that a movement control mechanism for changing the speed is provided.

According to the above configuration, when the pressure loss of the filter medium exceeds a predetermined value, the movement control mechanism can increase the moving speed of the filter medium and promptly promote the separation of the paint residue from the filter medium.

The movement control mechanism can change the moving speed of the filter medium according to the situation of spray painting on the object to be coated in the painting booth. It is also possible to control the filter medium to stop moving when it is not painted in the painting booth. The movement control mechanism can also control the movement or stop of the filter medium in conjunction with the movement or stop of the object to be conveyed conveyor or the coating machine.

In the present invention, it is preferable that a recovery unit for collecting the paint residue separated from the filter medium is provided below the separation mechanism.

According to the above configuration, the paint residue separated from the filter medium can be collected by the collection unit, so that the operator does not need to manually collect the paint residue.

The collection unit includes a bucket that can store paint residue, a conveyor mechanism that can carry the paint residue, and a suction means that can suck in mist-like paint, vaporized gas of the paint residue, dust, and the like. It can be illustrated.

In the present invention, it is preferable that the recovery unit is provided with a slag amount detection unit capable of detecting the amount of the recovered paint slag.

According to the above configuration, the amount of paint slag collected by the slag detection unit can be detected, so that the removal status of paint slag can be grasped.

In the present invention, it is preferable that the collecting unit is provided with a bucket and a transport mechanism for transporting the bucket.

According to the above configuration, the collection unit can be configured by a simple structure called a bucket. In addition, the bucket can be transported and replaced by the transport mechanism. Examples of the transport mechanism include manual transport by workers and automatic transport by a conveyor mechanism or an automatic guided vehicle.

In the present invention, it is preferable that the recovery unit is provided with a suction means capable of sucking the vaporized gas of the paint residue and the dust of the paint residue.

According to the above configuration, it is possible to recover the vaporized gas of the paint residue and the dust of the paint residue generated when the filter medium is separated from the filter medium by the separation mechanism.

In the present invention, it is preferable that the recovery unit is provided with an air supply means capable of supplying air or an inert gas.

According to the above configuration, it is possible to prevent the harmful effect caused by the temperature of the recovery part rising too much due to the action of the heating means, especially when the separation mechanism is provided with the heating means that thermally acts on the paint residue. it can.

In the present invention, the rotation speed of the motor of the blower is changed according to the air volume detecting unit capable of detecting the air volume inside the suction duct of the blower and the air volume inside the suction duct detected by the air volume detecting unit. It is preferable that a possible air volume control mechanism is provided.

According to the above configuration, the air volume control mechanism determines the degree of clogging of the filter medium according to the detection result by the air volume detection unit, and rotates the motor of the blower so that the suction air volume by the blower is maintained at a predetermined value. Control the speed.

In the present invention, it is preferable that the exhaust duct of the blower is provided with a secondary filter capable of collecting mist-like paint having a smaller particle size than the mist-like paint that can be collected by the filter medium.

According to the above configuration, the mist-like paint that was not collected by the filter medium can be collected by the secondary filter.

FIG. 1 is a schematic view of a removal system according to an embodiment of the present invention. FIG. 2 is an explanatory diagram of the collection unit. FIG. 3 is a schematic view of a removal system according to another embodiment of the present invention. FIG. 4 is a schematic view of a removal system according to still another embodiment of the present invention. FIG. 5 is a schematic front view of the removal system according to still another embodiment of the present invention. FIG. 6 is a schematic side view of a removal system according to still another embodiment of the present invention. FIG. 7 is a schematic plan view of a removal system according to still another embodiment of the present invention.

Hereinafter, embodiments of the removal system according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, the coating equipment 10 applies mist-like paint from the tunnel-shaped coating booth 12 and the exhaust inside the coating booth 12 including the mist-like paint in order to paint while moving the object to be coated 11. It has a removal system 20 for removing and discharging.

In the painting booth 12, a transport device 13 is installed to transport the object to be coated 11 along the longitudinal direction of the coating booth 12, and paint is applied to the object to be coated 11 transported by the transport device 13 beside the transfer device 13. A coating device 14 for spraying is installed.

The ceiling of the painting booth 12 is provided with an air supply unit 15 for ventilation air whose temperature and humidity are controlled. The floor surface of the painting booth 12 is composed of a work floor 16 having a ventilation opening. The work floor 16 is composed of, for example, grating or the like.

Excess mist-like paint generated by spray painting on the object to be coated 11 by the coating device 14 in the painting booth 12 is exhausted downward through the ventilation opening of the work floor 16 together with the air in the painting booth 12. .. Since the excess mist-like paint is exhausted in this way, the coating quality of the object to be coated 11 is kept high, and the working environment in the painting booth 12 is kept good.

The removal system 20 separates and recovers the filter device 21 that collects the mist-like paint from the air in the painting booth 12 that is exhausted through the work floor 16 and the mist-like paint that is collected by the filter device 21. The device 22 and the like are provided.

The filter device 21 has an endless belt-shaped filter medium 23. The filter medium 23 is made of a material such as stainless steel or a porous sintered metal, and is formed by connecting both ends of a single net-like material having breathability and a ability to collect mist-like paint. There is. Further, the filter medium 23 is made of a material that can withstand the separation treatment of the mist-like paint by the separation / recovery device 22 described later.

Below the work floor 16 of the painting booth 12, there is a collection space 24 as a paint collection area for collecting mist-like paint from the air of the painting booth 12 exhausted through the work floor 16 by the partition 26. It is partitioned into a separation space 25 as a paint separation region for separating the paint residue composed of the collected mist-like paint from the filter medium 23.

The filter medium 23 is the length of the coating booth 12 in front of and behind the moving direction of the filter medium 23, and is wound around a plurality of rotating rollers 27 arranged outside the collection space 24 and the separation space 25. They are arranged along the direction. A support roller for supporting the filter medium 23 between the adjacent rotary rollers 27 is appropriately provided between the plurality of rotary rollers 27.

At least one of the plurality of rotating rollers 27 around which the filter medium 23 is wound is a drive roller that can be driven by a motor 28 as a roller drive mechanism via a known power transmission mechanism composed of, for example, a chain and a sprocket. It is configured to work.

By driving the motor 28, the filter medium 23 is circulated and moved in the collection space 24 and the separation space 25. In the present embodiment, the moving direction of the filter medium 23 in the collecting space 24 is a direction along the moving direction of the object to be coated 11 in the painting booth 12.

The motor 28 is drive-controlled by the drive control mechanism 29. The drive control mechanism 29 can move the filter medium 23 continuously or intermittently by continuously or intermittently driving the motor 28. Further, the drive control mechanism 29 is configured to be able to drive / stop the motor 28 according to the start / stop of the painting process in the painting booth 12.

The section 26 for partitioning the collection space 24 is provided with

passage ports

30 and 31 through which the filter medium 23 passes. Further, the collection space 24 is provided with a suction duct 33 of the blower 32 that sucks the air exhausted from the painting booth 12 through the work floor 16 through the filter medium 23. Since the suction of the blower 32 creates an air flow toward the collection space 24 at the

passage ports

30 and 31, the possibility that the exhaust gas from the painting booth 12 leaks to the outside through the

passage ports

30 and 31 is reduced. ing. The collection space 24 is provided with a differential pressure detecting unit (not shown) capable of detecting the pressure difference between the primary side and the secondary side of the filter medium 23.

The suction duct 33 of the blower 32 is provided with an air volume detecting unit (not shown) capable of detecting the internal air volume. As the pressure loss increases due to the adhesion of the mist-like paint to the filter medium 23, the amount of air passing through the suction duct 33 decreases. The air volume control mechanism controls the rotation speed of the motor of the blower 32 so that the suction air volume by the blower 32 is maintained at a predetermined value according to the detection result of the air volume detection unit.

The exhaust duct 34 of the blower 32 is provided with a secondary filter 35 capable of collecting mist-like paint having a smaller particle size than the mist-like paint that can be collected by the filter medium 23.

The drive control mechanism 29 described above is configured so that the rotation speed of the motor 28 can be changed according to the pressure difference detected by the differential pressure detecting unit.

When the pressure loss of the filter medium 23 becomes equal to or higher than a predetermined value, the drive control mechanism 29 increases the rotation speed of the motor 28 to increase the moving speed of the filter medium 23, and separates the paint residue from the filter medium 23 by the separation / recovery device 22 described later. It is possible to prompt quickly. Further, when the drive control mechanism 29 increases the rotation speed of the motor 28 in response to an increase in the pressure loss of the filter medium 23, for example, the pressure in the suction duct 33 continues to exceed the set value, the filter medium 23. Cleaning is done.

The air exhausted from the painting booth 12 through the work floor 16 by the suction of the blower 32 is filtered when passing through the portion of the filter medium 23 moving in the collection space 24 in the thickness direction. The mist-like paint in the exhaust gas is collected by the filter medium 23.

The mist-like paint is removed by the filter medium 23, and the purified air is discharged to the outside of the system through the exhaust duct 34. Alternatively, after the greenhouse temperature is appropriately adjusted, the air is returned to the painting booth 12 via the air supply unit 15 as ventilation air.

By the way, the mist-like paint has adhesiveness and adheres to the filter medium 23. Since there is a risk that the pressure loss of the filter medium 23 will increase and the collection efficiency will decrease due to the paint residue composed of the mist-like paint adhering to the filter medium 23, such a paint residue needs to be separated from the filter medium 23.

In order to separate and recover the paint residue adhering to the filter medium 23 from the filter medium 23, a separation and recovery device 22 is provided in the separation space 25.

The separation / recovery device 22 is provided with a separation mechanism 36 that separates the paint residue from the filter medium 23.

The separation mechanism 36 is provided with a laser blasting means (hereinafter, referred to as reference numeral 36). The laser blasting means 36 is configured to emit laser light from a laser oscillator. As a result, the paint residue adhering to the filter medium 23 is instantly melted, evaporated, and thermally destroyed and separated from the filter medium 23. In the laser blasting means 36, the paint slag is separated instantaneously, but according to the laser blasting means 36, a local and rapid temperature rise occurs in the irradiated portion of the laser beam, so that the laser blasting means 36 It functions as a physical means and a thermal means. The output of the laser light emitted from the laser transmitter of the laser blasting means 36 is configured to be adjustable according to the operating status of the painting booth 12, that is, the amount of mist-like paint generated and the moving speed of the filter medium 23. There is.

Below the laser blasting means 36, a collecting unit 37 for collecting the paint residue separated from the filter medium 23 is provided.

The collection unit 37 includes a bucket 38 capable of accommodating the paint residue and a suction means 41 capable of sucking the vaporized gas of the paint residue and the dust of the paint residue.

The paint residue separated from the filter medium 23 falls into the bucket 38 and is stored. The bucket 38 is mounted on an automatic guided vehicle 39 as a transport mechanism, and the automatic guided vehicle is automatically controlled based on a predetermined program, and the bucket 38 containing the paint residue and the empty bucket 38. The 38 can be transported and replaced. The transport mechanism is not limited to an automatic guided vehicle, and may be a conveyor mechanism such as a belt conveyor that can carry a bucket 38 on it. Further, the transfer is not limited to automatic transfer, and may be manual transfer by an operator.

The collection unit 37 includes a slag amount detection unit 40 that can detect the amount of paint slag collected in the bucket 38. The slag amount detecting unit 40 is composed of a level sensor capable of detecting the bulk of the paint slag collected in the bucket 38. The slag amount detecting unit 40 may be a weight sensor capable of detecting the weight of the paint slag collected in the bucket 38.

Since the amount of paint slag collected in the bucket 38 can be detected by the slag amount detecting unit 40, the removal status of the paint slag from the filter medium 23 can be indirectly grasped.

The suction means 41 includes a chamber 42 that covers the separation space 25, and a suction duct 43 that is branched and connected to the suction duct 33 of the blower 32. The suction duct 33 and the suction duct 43 are appropriately provided with air volume adjusting dampers (not shown). The chamber 42 is provided with

passage ports

44 and 45 through which the filter medium 23 passes. The vaporized gas of the paint slag and the dust of the paint slag generated when the paint slag is removed from the filter medium 23 by the laser blasting means 36 are sucked into the blower 32 through the suction duct 43 and exhausted to the outside of the system.

The filter medium 23 that collects the mist-like paint contained in the exhaust of the painting booth 12 is circulated and supplied after the paint residue is separated by the laser blasting means 36, and is used again for collecting the mist-like paint.

Since the separation mechanism 36 includes the laser blasting means 36 that thermally acts on the paint residue, the solvent concentration and the powder concentration in the air increase in addition to the temperature of the paint residue by irradiating the paint residue with the laser. However, there is a risk of problems occurring. Therefore, as shown in FIG. 2, the recovery unit 37 preferably includes an air supply means 46 capable of supplying air or an inert gas. By providing the air supply means 46, the temperature of the paint slag, the solvent concentration in the air, and the powder concentration can be kept within an appropriate range.

The air supply means 46 includes a blower 47 that supplies air or an inert gas inside the chamber 42, and an air supply duct 48 that is connected to the discharge port of the blower 47. The air supply means 46 may be configured so that the air supply amount can be changed according to the amount of air sucked by the suction means 41, the temperature of the paint slag, the solvent concentration in the air, the powder concentration, and the like.

[Another Embodiment]
Hereinafter, another embodiment of the removal system according to the present invention will be described. In the description of another embodiment, the configurations having the same functions as those of the other embodiments are designated by the same reference numerals in the description and the drawings, and the above description can be incorporated.

FIG. 3 shows a removal system according to another embodiment. Also in the other embodiment, the lower part of the work floor 16 of the painting booth 12 is a paint collecting area for collecting mist-like paint from the air of the painting booth 12 exhausted through the work floor 16 by the partition 26. It is divided into a collection space 24 and a separation space 25 as a paint separation region for separating the paint slag composed of the collected mist-like paint from the filter medium 23.

When the filter medium 23 is circulated and moved in the collection space 24 and the separation space 25, the filter medium 23 is configured to reciprocate inside the collection space 24. In the other embodiment, since the filter medium 23 reciprocates in the collection space 24, the separation space 25 is provided not below the collection space 24 but on the side thereof.

In the other embodiment, the direction of movement of the filter medium 23 in the collection space 24 is opposite to the direction of movement of the object to be coated 11 in the coating booth 12 on the upstream side of the filter medium 23. Reference numeral 23 denotes a direction along the moving direction of the object to be coated 11. However, this may be reversed.

The filter medium 23 can collect the mist-like paint on the outer peripheral surface on the outward route, and can collect the mist-like paint on the inner peripheral surface on the return route. On the return route, the filter medium 23 can collect paint residue in a state where the flow path of the filter medium 23 is narrowed due to clogging due to collection on the outward route, so that a mist-like paint having a smaller particle size can be efficiently collected. Can be collected. Since the mist-like paint collected on the outward route adheres to the filter medium 23 by the time it reaches the return route, the paint residue of the filter medium 23 moves to the downstream side even if the filter medium 23 is ventilated in the opposite direction on the return route. There is no risk of scattering.

Since the paint residue adheres to the outer peripheral surface and the inner peripheral surface of the filter medium 23, in the separation space 25, the laser blasting means 36 is provided so as to correspond to the outer peripheral surface and the inner peripheral surface respectively in order to separate them. It is preferable to be provided.

Further, in the collection space 24, on the downstream side of the filter medium 23, a mist-like paint having a smaller particle size than the mist-like paint that can be collected by the filter medium 23 can be collected in parallel with the filter medium 23 on the return path. The next filter 35 is provided. The secondary filter 35 is composed of a roll filter made of a wire mesh having a finer mesh than the filter medium 23.

If the configuration is provided in the exhaust duct 34 of the blower 32 as in the secondary filter 35 shown in FIG. 1, there is a risk that the pressure loss will increase due to the decrease in the passing wind speed. On the other hand, by providing the secondary filter 35 on the downstream side of the filter medium 23 inside the collection space 24 instead of the exhaust duct 34, the degree of reduction in the passing wind speed can be alleviated, so that the pressure loss is reduced. There is no risk of it becoming expensive.

Since the secondary filter 35 is made of wire mesh, the paint residue can be separated and reused by, for example, a laser blasting means 36, similarly to the filter medium 23. As described above, since the paint residue is collected on the outer peripheral surface and the inner peripheral surface of the filter medium 23, the load on the secondary filter 35 is reduced, so that the life of the secondary filter 35 is extended. ..

FIG. 4 shows a removal system according to a further alternative embodiment. In the other embodiment, the filter device 21 has an endless belt-shaped filter medium 23, but the filter medium 23 is endlessly formed by arranging a plurality of panel filters 49 along the moving direction. It is configured.

The panel filter 49 is composed of a frame body 50 made of stainless steel or the like and a filter medium 23 held by the frame body 50, and the frame body 50 of each panel filter 49 is wound around a plurality of rotating rollers 27. Each panel filter circulates along the longitudinal direction of the paint booth 12 in a manner attached to a belt or chain (not shown).

The filter medium 23 configured in this way is also circulated and moved in the collection space 24 and the separation space 25, and at that time, the filter medium 23 is circulated and moved so as to reciprocate inside the collection space 24. Also in the other embodiment, since the filter medium 23 reciprocates in the collection space 24, the separation space 25 is provided not below the collection space 24 but on the side thereof.

Further, since the paint residue adheres to the outer peripheral surface and the inner peripheral surface of the filter medium 23, a laser blasting means 36 may be provided so as to correspond to each of the outer peripheral surface and the inner peripheral surface in order to separate them. preferable.

FIG. 5, FIG. 6 and FIG. 7 show a removal system according to a further alternative embodiment. In the removal system according to the other embodiment, the filter medium 23 is composed of a plurality of sheets, and a plate 51 extending in the front-rear direction along the moving direction is provided on the peripheral edge of the back surface of each filter medium 23.

Further, along the longitudinal direction of the painting booth 12, the collection space 24 provided below the coating booth 12 and the separation space 25 provided laterally in the horizontal region with the collection space 24 are moved so as to circulate. The mechanism is arranged. The moving mechanism is composed of a transport roller mechanism 52 provided on the left and right along the moving direction.

The plate 51 provided in the filter medium 23 travels along the transport roller mechanism 52, so that the filter medium 23 circulates between the collection space 24 and the separation space 25. At that time, the transport roller mechanism 52 moves the adjacent filter media 23 in the collection space 24 in a state of being arranged in a state of being arranged without a gap along the moving direction, and in the separation space 25, the adjacent filter media 23 are moved along the moving direction. Is moved in the state where. The separation space 25 is provided with a laser blasting means 36.

The

passage ports

30 and 31 of the collection space 24 are provided with an opening / closing door 53 that opens and closes each time each filter medium 23 passes through. Similarly, the

passage ports

44 and 45 provided in the chamber 42 covering the separation space 25 are also provided with opening / closing doors 54 that are opened and closed each time each filter medium 23 passes through.

Also in the other embodiment, it is preferable that the collection space 24 is provided with a secondary filter 35 made of a roll filter made of a wire mesh having a finer mesh than the filter medium 23 on the downstream side of the filter medium 23.

In the other embodiment, the pressure difference detecting unit capable of detecting the pressure difference between the primary side and the secondary side of the filter medium 23 and the filter medium 23 by the transport roller mechanism 52 according to the pressure difference detected by the differential pressure detecting unit. A movement control mechanism (not shown) for changing the movement speed may be provided.

The movement control mechanism controls the transport roller mechanism 52, and when the pressure loss of the filter medium 23 becomes a predetermined value or more, the movement speed of the filter medium 23 can be increased, and the separation of the paint residue from the filter medium 23 can be promoted quickly. .. Further, the movement control mechanism can change the moving speed of the filter medium 23 according to the situation of spray coating on the object to be coated 11 in the coating booth 12. Further, when the coating booth 12 is not painted, the filter medium 23 can be controlled to stop moving. The movement control mechanism can also control the movement or stop of the filter medium 23 in conjunction with the movement or stop of the object to be conveyed conveyor or the coating machine.

In the above-described embodiment, the configuration in which the laser blasting means 36 is provided in the separation mechanism 36 has been described, but the present invention is not limited to this. The separation mechanism 36 may be configured to reduce or while reducing the adhesive force of the paint slag adhering to the filter medium 23, and is a physical means that physically acts on the paint slag, the paint slag. A thermal means that thermally acts on the paint, or a curing and solidifying means that heat-cures or cools and solidifies the paint slag may be provided.

Therefore, for example, the separation mechanism 36 may be provided with dry ice blasting means. The dry ice blasting means is configured to cause granular dry ice to collide with an object to be coated from a nozzle by compressed air. As a result, the temperature of the paint slag is rapidly lowered and heat shrinks, and minute cracks are generated at the interface to reduce the adhesive strength. Further, the paint residue is separated from the filter medium 23 as the volume of the dry ice that has entered the gap between the paint residue and the filter medium 23 expands when sublimated. That is, the dry ice blasting means functions not only as a physical means but also as a thermal means.

As the thermal means, a heating means and a cooling means may be provided. For example, the heating means heats the paint residue adhering to the filter medium 23 by conduction, convection, or radiation like a halogen heater or an induction heater, and heat-hardens the paint residue to reduce its adhesive force. It may be configured in. That is, the heating means functions not only as a thermal means but also as a curing and solidifying means.

For example, the cooling means cools and solidifies the paint slag by cooling the paint slag adhering to the filter medium 23 by conduction, convection, or radiation, such as an ultra-low temperature roller, ultra-low temperature air cooling, or an extremely low temperature gas spray. It may be configured to reduce its adhesive strength. That is, the cooling means functions not only as a thermal means but also as a curing and solidifying means.

As the physical means, a peeling means for separating the paint residue from the filter medium 23 by physical contact may be provided. Examples of the peeling means include scraping with a scraper and injection of a high-pressure fluid. In this case, the above-mentioned heating means or cooling means may be provided on the upstream side of the filter medium 23 in the moving direction, and the peeling means may be provided on the downstream side.

Further, the separation mechanism 36 may include a vibration applying means for separating the paint residue from the filter medium 23 by vibrating the filter medium 23.

In any case, if the separation mechanism 36 is configured to separate the paint slag adhering to the filter medium 23 from the filter medium 23 by any of the above-mentioned means or a combination of the above-mentioned means. Good.

In the above embodiment, the separation mechanism 36 is installed at one place in the circulation path of the filter medium 23, but the separation mechanism 36 may be installed at a plurality of places along the circulation path of the filter medium 23. At that time, each of the separation mechanisms 36 may be provided with a laser blasting means 36 so that the emission intensity of each laser beam may be different, or the mechanism for separating the paint residue from the filter medium 23 may be different for each separation mechanism 36. It may be configured.

In the above-described embodiment, the filter medium 23 is configured to move in the longitudinal direction of the coating booth 12, but this is not the case. The filter medium 23 may be configured to move in the lateral direction of the painting booth 12. At that time, a plurality of filter media 23 may be provided.

In the above-described embodiment, the collection unit 37 is configured to include the bucket 38 and the suction means 41, but this is not the case. For example, the collection unit 37 may be a conveyor mechanism such as a belt conveyor on which paint residue can be carried.

In the above-described embodiment, the structure in which the filter medium 23 is circulated and moved by the power of the motor 28 has been described, but the present invention is not limited to this. The filter medium 23 may be circulated and moved by the human power of a worker.

The above-described embodiments are all examples of the present invention, and the description does not limit the present invention, and the specific configuration of each part can be appropriately modified and designed within the range in which the effects of the present invention are exhibited. is there.

10: Painting equipment 11: Object to be coated 12: Painting booth 13: Conveyor device 14: Coating device 15: Air supply unit 16: Work floor 20: Removal system 21: Filter device 22: Separation and recovery device 23: Filter material 24: Collection Space 25: Separation space 26: Section 27: Rotating roller 28: Motor (roller drive mechanism)
29: Drive control mechanism 30: Passage port 31: Passage port 32: Blower 33: Suction duct 34: Exhaust duct 35: Secondary filter 36: Separation mechanism (laser blasting means)
37: Collection unit 38: Bucket 39: Automatic guided vehicle (transport mechanism)
40: Slag detection unit 41: Suction means 42: Chamber 43: Suction duct 44: Passage port 45: Passage port 46: Air supply means 47: Blower 48: Air supply duct 49: Panel filter 50: Frame 51: Plate 52 : Transport roller mechanism 53: Open / close door 54: Open / close door

Claims

A system for removing mist-like paint contained in the exhaust of a painting booth.
A blower that sucks in the air inside the painting booth,
A dry filter medium arranged between the coating booth and the blower to ventilate the air sucked from the coating booth into the blower to collect the mist-like paint contained in the air.
A removal system including a separation mechanism for separating a paint residue composed of the mist-like paint collected by the filter medium from the filter medium.
The removal system according to claim 1, wherein the separation mechanism is provided with a physical means that physically acts on the paint residue.
The removal system according to claim 1 or 2, wherein the separation mechanism is provided with a thermal means that thermally acts on the paint residue.
The removal system according to any one of claims 1 to 3, wherein the separation mechanism is provided with a curing and solidifying means for heat-curing or cooling and solidifying the paint residue.
The removal system according to any one of claims 1 to 4, wherein the separation mechanism includes a vibration applying means for separating the paint residue from the filter medium by vibrating the filter medium.
The filter medium is formed in the shape of an endless belt wound around a plurality of rotating rollers.
The removal system according to any one of claims 1 to 5, further comprising a roller drive mechanism for driving at least one of the plurality of rotary rollers.
A differential pressure detection unit that can detect the pressure difference between the primary side and the secondary side of the filter medium,
The removal system according to claim 6, further comprising a drive control mechanism for changing the rotation speed of the rotating roller by the roller drive mechanism according to the pressure difference detected by the differential pressure detection unit.
The filter medium is composed of a plurality of sheets.
Each of the filter media is provided with a moving mechanism for circulating and moving a paint collecting region for collecting the mist-like paint by the filter media and a paint separating region for separating the paint residue from the filter media.
In the paint collecting region, the moving mechanism moves the adjacent filter media in a state of arranging them along the moving direction without a gap, and in the paint separating region, the adjacent filter media have a gap along the moving direction. The removal system according to any one of claims 1 to 5, which is configured to move in a moved state.
A differential pressure detection unit that can detect the pressure difference between the primary side and the secondary side of the filter medium,
The removal system according to claim 8, further comprising a movement control mechanism that changes the moving speed of the filter medium by the moving mechanism according to the pressure difference detected by the differential pressure detecting unit.
The removal system according to any one of claims 1 to 9, wherein a collection unit for collecting the paint residue separated from the filter medium is provided below the separation mechanism.
The removal system according to claim 10, wherein the collecting unit is provided with a slag amount detecting unit capable of detecting the amount of the collected paint slag.
The removal system according to claim 10 or 11, wherein the collection unit is provided with a bucket and a transport mechanism for transporting the bucket.
The removal system according to any one of claims 10 to 12, wherein the collecting unit is provided with a suction means capable of sucking the vaporized gas of the paint residue and the dust of the paint residue.
The removal system according to claim 13, wherein the recovery unit is provided with an air supply means capable of supplying air or an inert gas.
An air volume detection unit that can detect the air volume inside the suction duct of the blower, and
The invention according to any one of claims 1 to 14, further comprising an air volume control mechanism capable of changing the rotation speed of the motor of the blower according to the air volume inside the suction duct detected by the air volume detecting unit. Removal system.
According to any one of claims 1 to 15, the exhaust duct of the blower is provided with a secondary filter capable of collecting mist-like paint having a smaller particle size than the mist-like paint that can be collected by the filter medium. The removal system described.