WO2016203504A1

WO2016203504A1 - Coating carrier gas control device

Info

Publication number: WO2016203504A1
Application number: PCT/JP2015/002995
Authority: WO
Inventors: 阿部　正一; 裕司小柴
Original assignee: 有限会社ミクロコスモス
Priority date: 2015-06-16
Filing date: 2015-06-16
Publication date: 2016-12-22
Also published as: JP6095081B6; JPWO2016203504A1; JP6095081B1

Abstract

In order to allow a reduction in the amount of coating material or diluent used, the present invention comprises: a steam separation means (13) and a dehumidification and drying means (15), which act as drying mechanisms to dehumidify and dry a carrier gas (9) sent from a gas supply source unit (1); a pressure adjustment means (16) that adjusts the pressure of the carrier gas (9) such that the pressure in a spray gun (7) acting as a coating means, to which the carrier gas (9) is supplied, matches a prescribed pressure; a heating means (21) that heats the carrier gas (9) such that the temperature in the spray gun (7) acting as a coating means matches a prescribed temperature; and a warming means (23) that warms the atmosphere inside a housing provided with a space (24) that accommodates a hose (6) for supplying the carrier gas (9) to the spray gun (7) acting as a coating means.

Description

Control device for coating carrier gas

The present invention relates to a coating carrier gas control device. More specifically, the present invention relates to a technique for controlling the carrier gas for coating supplied to the coating means for performing spray coating so as to keep it in a good state.

As a conventional apparatus that performs spray painting using a spray gun as a painting means, for example, as shown in FIG. 5, compressed air from an air compressor 101 is applied to a paint tank via a pipe 102, a manual air regulator 103, and a pipe 104. The inorganic paint in the paint tank 105 is introduced into the pipe 105 and sent out to the pipe 106 by the compressed air and supplied to the spray gun 107. A pipe 108 for supplying compressed air to the spray gun 107 is provided in the pipe 102. The pressure of the compressed air supplied to the spray gun 107 is adjusted by an air regulator 108a that is branched from the pipe 108 and provided in the pipe 108 (Patent Document 1).

Japanese Patent Laid-Open No. 10-235235

However, for example, in a conventional coating apparatus such as that described in Patent Document 1, since compressed air in the surrounding atmosphere is directly supplied to the spray gun 107 as a carrier gas, the coating operation in a state including moisture is performed. Thus, the humidity state of the carrier gas (that is, compressed air) fluctuates depending on the season and work environment, so that there is a problem that unevenness (in other words, variation) is likely to occur in the finished paint.

In the conventional coating apparatus, the pressure adjustment of the compressed air is only the pressure setting of the air regulator 108a, which tends to be a high setting, and there is a problem that the paint and diluent are excessively used. Specifically, for example, compressed air of about 0.5 to 1.0 MPa is sent from the air compressor 101 so that the pressure of the compressed air in the spray gun 107 (that is, the pressure of the blowout) becomes about 0.25 MPa. Set to

Further, in the conventional coating apparatus, the coating operation is performed in the temperature state of the compressed air sent from the air compressor 101, and the temperature of the carrier gas (that is, the compressed air) varies depending on the season and the working environment. However, there is a problem in that the paint and diluent are excessively used (in other words, the yield is poor).

Further, there is a problem that excessive use of the paint and diluent causes deterioration of the working environment at the painting site and contributes to diffusion of volatile organic compounds (also expressed as VOC).

Therefore, the present invention can reduce the amount of paint and diluent used, and thus improve the working environment at the painting site and suppress the diffusion of volatile organic compounds, as well as a coating carrier gas control device. The purpose is to provide.

In order to achieve such an object, the coating carrier gas control device of the present invention has a predetermined pressure in the drying mechanism for dehumidifying and drying the carrier gas delivered from the gas supply source unit and the coating means to which the carrier gas is supplied. Pressure adjusting means for adjusting the pressure of the carrier gas so that the pressure of the carrier gas becomes equal to, a heating means for heating the carrier gas so that the temperature in the coating means becomes a predetermined temperature, and for supplying the carrier gas to the coating means Heating means for heating the atmosphere in the housing having a space for housing the hose.

Therefore, according to this coating carrier gas control device, the humidity, temperature, and pressure of the carrier gas supplied to the coating means are managed and controlled in an appropriate state, so that it is suitable for spraying paint with uniform quality. Is supplied to the coating means.

According to this coating carrier gas control device, when the carrier gas supplied to the coating means is appropriately heated, the paint blown out together with the carrier gas is heated, whereby the paint is applied to the coating. Since it becomes easy to be in an appropriate spraying state, coating is performed with a lower spraying pressure than in the past.

The coating carrier gas control device of the present invention may further include a storage unit that temporarily stores the carrier gas after passing through the drying mechanism in a pressurized state and then sends it to the pressure adjusting means. Since the carrier gas delivery pressure is smoothed, the pressure of the carrier gas blown out from the coating means, and the pressure of the paint blowout from the painting means together with the carrier gas is increased. It becomes smooth.

In the coating carrier gas control device of the present invention, the hose may be covered with a heat insulating material. In this case, since the temperature drop due to the heat radiation of the carrier gas in the hose is suppressed, The temperature drop of the blown carrier gas is suppressed, and the temperature drop of the paint blown out from the coating means together with the carrier gas is suppressed.

The control device for the coating carrier gas of the present invention may further include a device branched from the hose so that the carrier gas is blown out toward the coating means. In this case, the coating means is warmed and the coating is performed. Since the temperature is kept during the work, the temperature drop of the paint blown out from the coating means is suppressed.

The control device for the coating carrier gas of the present invention may further include a paint heating unit for storing the paint supplied to the painting means and for heating the paint before the painting operation using the atmosphere in the housing. Well, in this case, since the preheated paint is supplied to the coating means, the temperature drop as a mixture of the paint and the carrier gas when blown out from the coating means is suppressed.

The coating carrier gas control device according to the present invention includes an airflow adjustment unit including a drying mechanism and a pressure adjustment unit, a heating unit including a heating unit and a heating unit, and a storage unit, or a storage unit of these units. A moving means may be provided for any combination of a plurality of units, and in this case, the unit can be moved for each unit or for each combination of a plurality of units. Equipment can be easily moved and installed according to the location (painting site).

According to the coating carrier gas control device of the present invention, a carrier gas suitable for spraying paint and having a uniform quality can be supplied to the coating means, so that the finish of spray coating is improved. Is possible.

According to the coating carrier gas control device of the present invention, since coating can be performed with a lower spray pressure than before, it is possible to reduce the amount of paint and diluent used when spraying liquid paint. In addition, the amount of paint used in the case of spraying a powder paint can be reduced.

In addition, when the coating carrier gas control device of the present invention has a storage unit for temporarily storing the carrier gas, the coating gas blowing pressure blown from the coating means together with the carrier gas is smoothed. As a result, it is possible to prevent fluctuations in the amount of paint blown out, thereby preventing uneven coating of the paint and improving the finish of the spray painting.

When the hose is covered with a heat insulating material, the coating carrier gas control device of the present invention can suppress the temperature drop of the paint blown from the coating means together with the carrier gas. The temperature control of the paint becomes easy, and as a result, the paint temperature can be maintained in an appropriate state and good coating can be performed.

When the coating carrier gas control device of the present invention has an appliance branched from the hose, it can suppress the temperature drop of the paint blown out from the painting means, so that the temperature management of the paint is easy. As a result, it is possible to perform satisfactory coating while maintaining the temperature of the coating material in an appropriate state.

When the paint carrier gas control device of the present invention has a paint heating unit for warming the paint before the painting operation, it is a mixture of the paint and the carrier gas when blown out from the painting means. Therefore, it is possible to easily control the temperature of the coating material, and to maintain the temperature of the coating material in an appropriate state and perform good coating.

In the coating carrier gas control apparatus according to the present invention, when the moving means is provided in the units constituting the apparatus, the movement of the apparatus in accordance with the movement of the painting place (painting place) by the painting work process. -Since installation can be performed easily, it becomes possible to improve the ease of handling of the apparatus and to reduce the labor of painting work.

It is a functional block diagram (in other words, piping system diagram) showing an example of the embodiment of the control device for the coating carrier gas of the present invention. It is a figure which shows the table | surface which arranged the result of Example 1. FIG. It is a figure which shows the table | surface which arranged the result of Example 2. FIG. It is a figure which shows the table | surface which arranged the result of Example 3. FIG. It is a piping system diagram which shows the conventional coating apparatus.

Hereinafter, the configuration of the present invention will be described in detail based on an example of an embodiment shown in the drawings.

FIG. 1 shows an example of an embodiment of a coating carrier gas control device of the present invention.

The control device for the coating carrier gas of the present embodiment includes an airflow adjustment unit 10, a storage unit 4, and a heating unit 20 as a rough configuration. Then, the paint is blown out from the coating means 7 by the pressure of the carrier gas 9 supplied from the gas supply source unit 1 and subjected to necessary processing through these

units

10, 4, 20 (in other words, sprayed / discharged). ).

As the coating means 7 in the present invention, for example, a spray gun similar to a conventional spray gun for painting can be used.

Specifically, for example, it has a nozzle that sprays paint, a grip that is gripped during work, a trigger that controls the start, stop, and degree of paint blowing, a paint cup 7a, and a hose 6 connected thereto. A hand-blown spray gun (also referred to as a cup gun in terms of having a paint cup 7a) may be used.

The paint cup 7a is filled with a liquid paint (also referred to as a solvent paint) adjusted to an appropriate concentration with a diluent / solvent.

Then, when the trigger is operated, the pressurized carrier gas 9 is introduced from the hose 6 and mixed with the pressurized carrier gas 9 (in other words, the pressurized carrier gas 9 is mixed). At the same time, the paint is blown out from the nozzle (by the pressure of the pressurized carrier gas 9).

And the control apparatus of the coating carrier gas of this embodiment is the air-water separation means 13 and the dehumidification drying means 15 as a drying mechanism which dehumidifies and dries the carrier gas 9 sent from the gas supply source unit 1, and carrier gas. Pressure adjusting means 16 for adjusting the pressure of the carrier gas 9 so that the pressure in the spray gun 7 as the coating means to which 9 is supplied becomes a predetermined pressure, and the temperature in the spray gun 7 as the coating means is set to a predetermined temperature. Heating means 21 for heating the atmosphere in the housing provided with a heating means 21 for heating the carrier gas 9 and a space 24 for housing the hose 6 for supplying the carrier gas 9 to the spray gun 7 as a coating means. And have

The coating carrier gas control device of the present embodiment further stores the carrier gas 9 after passing through the steam-water separating means 13 as a drying mechanism, temporarily stored in a pressurized state and then sent to the pressure adjusting means 16. The unit 4 is provided.

The gas supply source unit 1 is for sending a carrier gas 9 used for blowing paint from a spray gun 7 as a coating means at a predetermined pressure and supplying the carrier gas 9 to the airflow adjusting unit 10.

As the carrier gas 9 in the present invention, a gas similar to the gas supplied to the conventional spray gun can be used. For example, air, inert gas, specifically air, nitrogen (N ₂ ) gas, or Helium (He) gas or the like can be used (which is supplied as a compressed gas).

Further, as the gas supply source unit 1, a mechanism is used that has a capability of delivering gas at a pressure that can cause the storage unit 4 to store the carrier gas 9 in a predetermined pressurized state.

The pressure of the carrier gas 9 delivered from the gas supply source unit 1 is not limited to a specific value. For example, the carrier gas 9 passes through the airflow adjustment unit 10 and is stored in a predetermined pressurized state. In consideration of the pressure that can be stored in 4, it is appropriately set to an appropriate value. Specifically, for example, as an example, it is appropriately set to an appropriate value in a range of about 0.50 to 1.0 MPa.

Specifically, as the gas supply source unit 1, for example, an air compressor is used, or a gas cylinder filled with a carrier gas 9 as a compressed gas, and a pressure regulator for adjusting the pressure of the gas output from the gas cylinder Or a combination of

The carrier gas 9 sent out from the gas supply source unit 1 is supplied to the airflow adjustment unit 10 through the gas input pipe 2.

In this embodiment, the allowance and restriction of the inflow of the carrier gas 9 to the airflow adjustment unit 10 are controlled by opening and closing the gas input valve 11 provided in the gas input pipe 2.

The air flow adjusting unit 10 performs a cleaning process, a water / water separation process and a dehumidifying and drying process on the carrier gas 9 supplied from the gas supply source unit 1, and a spray gun 7 through a heating unit 20 and a hose 6. This is for adjusting the pressure of the carrier gas 9 supplied to the air.

In the present embodiment, the airflow adjustment unit 10 includes a cleaning mechanism for performing a cleaning process, and a drying mechanism for performing a steam-water separation process and a dehumidifying and drying process. And it comprises the primary cleaning means 12 and the secondary cleaning means 14 as the cleaning processing mechanism, and the steam-water separating means 13 and the dehumidifying and drying means 15 as the drying mechanism.

The carrier gas 9 is first introduced into the primary cleaning means 12 provided in the airflow adjustment unit 10.

The primary cleaning means 12 is for removing contaminants such as dust in the carrier gas 9 to clean the carrier gas 9 (primary cleaning process).

The primary cleaning means 12 is not limited to a specific type or specification, and is appropriate in consideration of, for example, the degree of cleaning required when storing the carrier gas 9 in the storage unit 4. Is appropriately selected.

As the primary cleaning means 12, specifically, for example, an air filter having appropriate filtration performance (filtration degree) can be used.

The carrier gas 9 is also introduced into the steam / water separation means 13 provided in the airflow adjustment unit 10.

The air / water separation means 13 is for dehydrating the carrier gas 9 by separating and removing drains and water droplets in the carrier gas 9.

The steam-water separation means 13 is not limited to a specific type or specification, and for example, the degree of drying (dehydration) required when storing the carrier gas 9 in the storage unit 4 at a predetermined pressure. Appropriate ones are selected as appropriate.

As the steam-water separation means 13, specifically, for example, a steam-water separator having proper drain / water droplet separation / exclusion performance can be used.

Note that the foreign matter, moisture, and the like separated and removed by the primary cleaning means 12 and the air / water separation means 13 are collected, for example, in a drain pan (not shown) installed outside the airflow adjustment unit 10 and appropriately discarded. .

Further, in the example shown in FIG. 1, the air / water separation process is performed after the primary cleaning process, but the order is not limited to this, and the primary cleaning process is performed next to the air / water separation process. You may make it.

The carrier gas 9 subjected to the primary cleaning process and the steam separation process in the airflow adjustment unit 10 is sent out from the airflow adjustment unit 10 via the introduction pipe 3A and introduced into the storage unit 4.

The storage unit 4 is a carrier gas 9 in a predetermined (or within a predetermined range) pressurized state for the purpose of smoothing the delivery pressure of the carrier gas 9 and stabilizing the fluidity of the carrier gas 9. Is for temporary storage.

In particular, when an air compressor is used as the gas supply source unit 1, the carrier gas 9 sent from the air compressor is accompanied by wave fluctuations and pulsations. Thus, the wave fluctuation and pulsation are eliminated (that is, suppressed), the pressure of delivery of the carrier gas 9 is smoothed, the fluidity is stabilized, and the discharge of the paint from the spray gun 7 is stabilized.

As the storage unit 4, specifically, for example, a tank having at least strength (specifically, airtightness) that can store gas in a predetermined pressurized state may be used.

The gas pressure in the storage unit 4 is adjusted so as to be in the range of, for example, about 0.50 to 1.0 mm2 for example as an example.

The internal volume and the maximum operating pressure of the storage unit 4 are not limited to a specific size or numerical value. For example, the volume or spray gun required for performing a continuous painting operation for a certain time without trouble. In consideration of the final pressure of the carrier gas 9 supplied to 7, it is appropriately set to an appropriate size and value.

The internal volume of the storage unit 4 can be set to an appropriate size in a range of, for example, about 40 to 80 L, specifically as an example. Further, the working pressure of the storage unit 4 can be set to an appropriate numerical value within a range of, for example, about 0.50 to 1.0 kgpa, for example.

Then, by fixing the degree of opening of the delivery valve of the storage unit 4 at a constant level, the carrier gas 9 is delivered from the delivery valve of the storage unit 4 with a smooth pressure that does not vary periodically.

The carrier gas 9 sent out from the storage unit 4 is supplied again to the air flow adjusting unit 10 through the sending pipe 3B.

Then, the carrier gas 9 is introduced into the secondary cleaning means 14 provided in the airflow adjustment unit 10.

The secondary cleaning means 14 is for removing dust / impurities such as oil fine particles (oil mist) and fine solids in the carrier gas 9 to clean the carrier gas 9 (secondary cleaning treatment). .

The secondary cleaning means 14 is not limited to a specific type or specification. For example, the desired degree of cleaning as the carrier gas 9 supplied to the dehumidifying and drying means 15 and the carrier gas 9 supplied to the spray gun 7 are used. In consideration of a desirable degree of cleaning, an appropriate one is appropriately selected.

Specifically, as the secondary cleaning means 14, for example, a mist filter, a micro mist filter, and a super mist filter having appropriate dust removal / absorption performance (each of which is a mist separator, a micro mist separator, and a super mist separator, respectively) Any one of them may be used, or two or more may be used in combination.

The carrier gas 9 is then introduced into the dehumidifying and drying means 15 provided in the airflow adjusting unit 10.

The dehumidifying and drying means 15 is for removing moisture in the carrier gas 9 and dehumidifying and drying the carrier gas 9.

The dehumidifying and drying means 15 is not limited to a specific type or specification. For example, the degree of drying (dehumidifying and drying) desirable as the carrier gas 9 supplied to the spray gun 7 is considered. An appropriate one is appropriately selected.

As the dehumidifying and drying means 15, specifically, for example, an air dryer having an appropriate moisture removal performance can be used.

The carrier gas 9 is then introduced into the pressure adjusting means 16 provided in the airflow adjusting unit 10.

The pressure adjusting means 16 is configured so that the pressure of the carrier gas 9 becomes an appropriate pressure to be supplied to the spray gun 7 via the hose 6 via the heating unit 20, in other words, the carrier from the spray gun 7. This is for adjusting the pressure of the carrier gas 9 delivered to the heating unit 20 so that the blowing pressure of the gas 9 becomes appropriate.

The set pressure for delivery of the carrier gas 9 by the pressure adjusting means 16 is not limited to a specific value. For example, the carrier gas 9 is discharged from the spray gun 7 while the carrier gas 9 passes through the appropriate pressure or hose 6. An appropriate value is appropriately set in consideration of the pressure loss of the gas 9 and the like. Specifically, for example, as an example, it is appropriately set to an appropriate value in a range of about 0.3 to 0.5 MPa.

The pressure adjusting means 16 is not limited to a specific type or specification, and functions to output the carrier gas 9 sent and input from the storage unit 4 at a predetermined pressure at a predetermined constant pressure. An appropriate mechanism to be obtained is appropriately selected.

Specifically, as the pressure adjusting means 16, for example, there is a pressure regulator (also called a pressure regulating valve or a regulator) that can keep the pressure of the output gas constant even if the pressure of the input gas fluctuates. Can be used.

Then, the carrier gas 9 that has been subjected to the cleaning process, the steam separation process, and the dehumidifying drying process in the airflow adjustment unit 10 and whose pressure has been adjusted is transferred from the airflow adjustment unit 10 to the heating unit 20 via the connection pipe 5. Is sent out.

The heating unit 20 performs a heating process on the carrier gas 9 delivered from the airflow adjustment unit 10 and is connected to the spray gun 7 to provide a hose 6 for supplying the carrier gas 9 to the spray gun 7. This is to heat and keep the carrier gas 9 in the hose 6 warm.

For this reason, the heating unit 20 has a casing, and includes a heating means 21 and a heating means 23 inside the casing.

Then, the carrier gas 9 is introduced into the heating means 21 provided in the heating unit 20.

The heating means 21 adjusts the blowing temperature of the carrier gas 9 from the spray gun 7 so that the temperature of the carrier gas 9 becomes an appropriate temperature to be supplied to the spray gun 7 via the hose 6. It is for adjusting the temperature of the carrier gas 9 delivered to the hose 6 so as to be appropriate.

The set temperature of the heating process of the carrier gas 9 by the heating means 21 is not limited to a specific value, for example, while passing through an appropriate blowing temperature of the carrier gas 9 from the spray gun 7 or the hose 6 or the like. In consideration of the temperature drop of the carrier gas 9 in FIG. Specifically, for example, it is preferably set in a range of about 30 to 60 ° C., more preferably in a range of about 40 to 55 ° C., and most preferably about 50 ° C.

The heating means 21 is not limited to a specific type or specification, and an appropriate mechanism that can function to output the input carrier gas 9 at various temperatures at the above temperature is appropriately selected.

As the heating means 21, specifically, for example, a gas warmer capable of supplying a desired amount of heat to the gas according to the flow rate of the passing gas can be used.

In the present embodiment, a gas output valve 22 is provided in the piping on the output side of the heating means 21, and the allowance and limitation of the outflow of the carrier gas 9 from the heating unit 20 are controlled by opening and closing the gas output valve 22. The

The hose 6 is connected to the gas output valve 22, and the hose 6 and the spray gun 7 are connected via a coupler 8 including a socket 8A at the end of the hose 6 and a plug 8B coupled to the socket 8A.

When the gas output valve 22 is opened, the carrier gas 9 is sent from the heating means 21 to the hose 6, and the carrier gas 9 that has passed through the hose 6 is supplied to the spray gun 7.

As the hose 6, a hose having a performance capable of withstanding a predetermined pressure of the carrier gas 9 supplied to the spray gun 7 is used.

Further, it is preferable that the hose 6 has a function / mechanism for rectifying the carrier gas 9. Specifically, for example, a concave groove continuous in a spiral shape or a convex portion continuous in a spiral shape is formed on the inner peripheral surface of the hose 6, or a spiral shape (in other words, a spiral shape) in a portion near the spray gun 7 in the hose 6. Or a coil spring-like member may be mounted. As a result, the flow of the carrier gas 9 sent from the hose 6 to the spray gun 7 is adjusted, the carrier gas 9 having a stable flow is supplied to the spray gun 7, and then the paint is discharged from the spray gun 7. Is stable.

Here, in the present invention, the carrier gas 9 supplied to the spray gun 7 is heated so that the paint blown out together with the carrier gas 9 from the spray gun 7 has a predetermined temperature. By heating itself, the temperature drop of the carrier gas 9 heated by the heating means 21 can be suppressed.

Therefore, in the coating carrier gas control device of the present invention, the hose housing space 24 is secured in the casing of the heating unit 20 so that the hose 6 can be accommodated, and the hose 6 is wound or laminated. A mechanism to do this is provided.

And in order to warm the atmosphere in the housing | casing of the heating unit 20, the heating means 23 is provided in a housing | casing.

The set temperature of heating in the casing of the heating unit 20 by the heating means 23 is not limited to a specific value, and for example, appropriately suppressing a temperature drop of the carrier gas 9 while passing through the hose 6. Is properly set to an appropriate value. Specifically, for example, it is preferably set in a range of about 20 to 45 ° C., more preferably in a range of about 25 to 40 ° C., and a range of about 30 to 35 ° C. Most preferred.

The heating means 23 is not limited to a specific type or specification, and an appropriate mechanism capable of heating the atmosphere in the casing of the heating unit 20 to the above temperature is appropriately selected.

As the heating means 23, specifically, for example, an electric heater that can supply a necessary amount of heat to the atmosphere in the casing in accordance with the volume in the casing of the heating unit 20 can be used. In this case, an electric heater with a fan is preferable so that heat can be supplied while stirring the atmosphere in the housing.

In order to ensure that the atmosphere in the casing of the heating unit 20 is at an appropriate temperature (specifically, in the range of about 20 to 45 ° C.), the painting operation can be started at an appropriate time. You may make it provide the thermometer 26 which has the temperature detection part inserted in the said housing | casing and the temperature display part visible from the exterior of a housing | casing.

By housing the hose 6 in the casing of the heating unit 20, the hose 6 is also warmed by the atmosphere warmed by the heating means 23. Therefore, the hose 6 can be warmed in a shorter time than the case where the heated carrier gas 9 is warmed by passing through the hose 6, and the painting operation can be performed quickly.

In addition, by extracting the hose 6 from the casing of the heating unit 20 by a length necessary for the painting work, it is possible to minimize heat radiation from the hose 6.

In addition, in order to prevent the temperature drop due to heat radiation of the heated carrier gas 9 in the hose 6, the hose 6 is covered with a heat insulating material / heat insulating material, or a hose formed of the heat insulating material / heat insulating material is used as the hose 6. It is preferable that

In addition, in order to prevent a temperature drop due to heat radiation of the warm air atmosphere in the casing of the heating unit 20, the casing is formed of a heat insulating material or a heat insulating material, or a part or the whole of the case is covered with a heat insulating material or a heat insulating material. Is preferable.

Further, a plug 8B ′ having an exhaust port connected to the socket 8A at the end of the hose 6 and communicating with the inside of the casing of the heating unit 20 is attached to a side wall constituting the casing, and the end of the hose 6 is connected to the plug 8B ′. The carrier gas 9 delivered from the hose 6 may be introduced into the casing of the heating unit 20 by coupling the sockets 8 </ b> A.

With the above configuration, the carrier gas 9 heated by the heating means 21 and delivered to the hose 6 can be introduced into the casing of the heating unit 20 via the hose 6. As a result, it is possible to warm the atmosphere in the casing of the heating unit 20 in a shorter time than when warming only by heating, and it is possible to perform the painting work quickly.

In addition, when the carrier gas 9 delivered from the hose 6 is introduced into the casing of the heating unit 20, the atmosphere pressure in the casing rises, so the atmosphere in the casing (the hose 6) (Including the carrier gas 9 delivered from the outside) is provided. Specifically, for example, a suspension type swingable openable / closable door (for example, a pet door or a cat door) having a combination of a plate-like member and a hinge attached to the upper end of the plate-like member. It is conceivable that a small-sized one is installed in an appropriate place such as a side wall constituting the casing of the heating unit 20. As an example only, the opening for pulling out the hose 6 from the inside of the casing of the heating unit 20 may also be configured to serve as a mechanism for releasing the atmosphere in the casing to the outside.

Further, an instrument branching from the hose 6 is further provided at a position near the spray gun 7 of the hose 6 (for example, in the vicinity of the socket 8A at the end of the hose 6 in the example shown in FIG. 1) (FIG. (Not shown), the carrier gas 9 heated toward the surface of the main body of the spray gun 7 or the paint cup 7a may be blown out from the branch device.

Specifically, the device branched from the hose 6 is, for example, a Y-shaped branch pipe or tube having one end which is a single mouth and the other end which is bifurcated and has two ends (in this case) The one end is connected to the hose 6, one end of the other end is connected to the spray gun 7, and the carrier gas 9 is blown from the other end) or the Y-shaped branch pipe Or a single tube combination may be used.

When the above-described branching device is used, a cover is further provided around the body of the spray gun 7 or the paint cup 7a after an appropriate space (gap) is secured between them. The heated carrier gas 9 may be blown out and stay in the cover.

As a result, the main body of the spray gun 7, the paint cup 7a and the paint in the paint cup 7a are warmed and kept warm during the painting work, and even when the temperature at the painting site is low, Temperature management becomes easy, and it becomes possible to maintain the temperature of the paint blown out from the spray gun 7 in an appropriate range.

In addition, the coating carrier gas control device of the present invention accommodates the coating material supplied to the coating means 7 and uses the atmosphere in the casing of the heating unit 20 to warm the coating material before the coating operation. You may make it have the part 25 further.

Specifically, in the present embodiment, the paint cup 7a ′ containing the paint to be supplied to the spray gun 7 is accommodated, and the warm air atmosphere in the casing of the heating unit 20 is used to put the paint cup 7a ′. A paint heating unit 25 is provided for heating the applied paint before the painting operation.

The paint heating unit 25 may be provided adjacent to the side surface or the upper surface of the casing of the heating unit 20, or may be provided within the casing of the heating unit 20, or You may make it provide separately from the housing | casing of the heating unit 20. FIG.

When the paint heating unit 25 is provided adjacent to the side or upper surface of the casing of the heating unit 20 (the example shown in FIG. 1 is an image corresponding to this case), the side plate of the casing It is attached to the top plate and the top plate (At this time, these side plates and the top plate are used as one surface), and is configured as a box having a door that can be opened and closed on either the side surface or the top surface. It is possible.

In this case, the side plate and the ceiling of the casing are arranged so that the space in the casing of the heating unit 20 communicates with the space in the box as the paint heating section 25 so that the warm atmosphere in the casing can enter. A structure (reference numeral 25a in FIG. 1) for ventilation such as a louver or a through hole is provided at a position of the plate where the box is attached. In this case, a heat insulating material / heat insulating material may be used as a member constituting the box as the paint heating unit 25, or a part or the whole of the box may be covered with the heat insulating material / heat insulating material. preferable.

Further, when the paint heating unit 25 is provided in the casing of the heating unit 20, it is conceivable that the paint heating unit 25 is configured as a partial section in which the space in the casing is partitioned. In this case, a structure for ventilation such as a louver or a through hole is provided in the partition member constituting the compartment so that the warm atmosphere in the casing can enter the compartment as the paint heating unit 25. . In addition, an openable / closable door connected to the section as the paint heating unit 25 is provided on a side plate or a part of the top plate of the casing of the heating unit 20.

Further, when the paint heating unit 25 is provided separately from the casing of the heating unit 20, it is conceivable that the paint heating unit 25 is configured as an independent box having an openable / closable door. In this case, the casing and the box are connected to the space in the casing of the heating unit 20 and the space in the box as the paint heating unit 25 by the tubes communicating at both ends, respectively. An atmosphere is introduced into the box.

In this case, a heat insulating material / heat insulating material may be used as a member constituting the box as the paint heating unit 25, or a part or the whole of the box may be covered with the heat insulating material / heat insulating material. Preferably, the tube is covered with a heat insulating material / heat insulating material, or a hose formed of a heat insulating material / heat insulating material is used as the tube.

By heating the paint together with the paint cup 7a ′ by the paint heating unit 25 before the painting operation, the temperature of the paint blown out together with the carrier gas 9 is low even if the carrier gas 9 is heated. It is prevented that the temperature of the paint when it is blown out from the spray gun 7 is lowered, the temperature management of the paint is facilitated, and the temperature of the paint to be blown out is maintained within an appropriate range. It becomes possible.

Note that the paint heating unit 25 may store the paint in a state other than the paint put in the paint cup 7a ′.

The airflow adjustment unit 10, the storage unit 4, and the heating unit 20 described above may be a fixed type that is installed and installed for each unit or after a plurality of arbitrary units are combined. Further, it may be a movable type provided with a moving means. In the case of a movable type, it becomes a structure which can move for every unit or for every combination of a some unit, and installation of the apparatus according to the field condition is attained.

Specifically, as the moving means for making the unit movable, for example, a carriage including a pedestal on which the unit is placed and a wheel provided on the lower side of the pedestal, or a pedestal on which the unit is placed And a mechanism having a wheel provided below the pedestal and a rail with which the wheel engages.

Further, in connection with the fact that the hose housing space 24 is secured in the housing of the heating unit 20 and the hose 6 is housed, the hose 6 is pulled out from the housing of the heating unit 20 during painting work. The heating unit 20 (and other units) can be installed in a safe area away from the explosive atmosphere at the site of painting by the spray gun 7 (that is, an area having a non-explosive atmosphere). Therefore, it is not necessary to make the heating unit 20 (and other units) have a structure that satisfies the standard as an explosion-proof device, and safety can be ensured. Further, as described above, the heating unit 20 (and other units) is provided with the moving means, so that the heating unit 20 (and other units) according to the movement of the painting place (painting site) by the painting work process. The unit can be easily moved and installed.

According to the coating carrier gas control device described above, the carrier gas 9 is cleaned and dried by the airflow adjusting unit 10, and further fluidized by being temporarily stored in a pressurized state in the storage unit 4. It is delivered at a stable and smooth pressure, and is heated by the heating unit 20 and then supplied to the spray gun 7.

At this time, in the case of a liquid paint (solvent paint), the atomization temperature of the paint in the spray gun 7 is about 20 to 30 ° C. by adjusting the temperature of the heating means 21 and the delivery pressure of the pressure adjusting means 16. The spray pressure from the nozzle of the spray gun 7 is preferably in the range of about 0.15 to 0.20 MPa, and the atomization temperature of the paint is in the range of about 23 to 27 ° C and the blowout pressure. Is more preferably in the range of about 0.165 to 0.185 MPa, most preferably the atomization temperature of the paint is about 25 ° C and the blowing pressure is in the range of about 0.170 to 0.180 MPa. preferable.

In the case of a powder paint, it is preferable that the blowing pressure from the nozzle of the spray gun 7 is in the range of about 0.050 to 0.10 MPa, and the blowing pressure is about 0.065 to 0.085 MPa. More preferably, the blowing pressure is in the range of about 0.07 to 0.08 kgpa.

According to the coating carrier gas control device having the above-described configuration, it is possible to ensure a clean carrier gas 9 free from contaminants, and to keep the temperature of the carrier gas 9 within an appropriate range regardless of the season and working environment. In addition, the humidity can be maintained within an appropriate range (in other words, the carrier gas 9 can be appropriately dried), and in addition, the blowing pressure of the carrier gas 9 can be maintained within the appropriate range. That is, the three elements of the temperature, humidity, and pressure of the carrier gas 9 can be managed and controlled in an appropriate state. For this reason, compared with the conventional spray coating method in which the pressure of the carrier gas 9 is set higher because the temperature and humidity are not controlled, the amount of paint and diluent used is reduced, and the working environment at the painting site is reduced. And the diffusion of volatile organic compounds can be suppressed. Furthermore, the paint blown out from the spray gun 7 together with the carrier gas 9 can be made into a good state suitable for painting by blowing, and the quality of the finish of spray painting can be improved.

Although the above-described embodiment is an example of a preferred embodiment for carrying out the present invention, the embodiment of the present invention is not limited to the above-described embodiment, and the present invention is not deviated from the gist of the present invention. Various modifications can be made.

For example, in the above-described embodiment, the case where the coating means 7 to which the carrier gas 9 is supplied is a hand-blown spray gun, but the painting means to which the present invention can be applied is limited to the hand-blown spray gun. The present invention can be widely applied in combination with various coating means in which paint is blown out by the pressure of the carrier gas 9 (in other words, sprayed / discharged). Specifically, for example, the present invention can also be applied when the coating means to which the carrier gas 9 is supplied is an automated coating module having a mechanism in which the coating material is blown out together with the coating carrier gas.

In the above-described embodiment, the liquid paint prepared in an appropriate concentration by the diluent / solvent and put in the paint cup 7a is blown out. However, the paint to which the present invention can be applied is a liquid paint. The present invention is not limited, and the present invention can also be applied as a control device for the coating carrier gas supplied to the coating means when the powder paint is blown out from the coating means.

In the above-described embodiment, the primary cleaning means 12 and the steam / water separation means 13 are disposed on the upstream side of the storage unit 4, and the secondary cleaning means 14 and the dehumidifying and drying means 15 are disposed on the downstream side. However, the presence or absence of these

means

12, 13, 14, and 15 (in other words, the configuration of the cleaning processing mechanism and the drying mechanism of the airflow adjustment unit 10) is not limited to that in the above-described embodiment. . In other words, the airflow adjustment unit 10 is required to clean or dry (dehydrate) the carrier gas 9 to the extent required when storing the carrier gas 9 in the storage unit 4 and to supply the carrier gas 9 to the spray gun 7. As long as such cleaning or drying is achieved, the presence of the

means

12, 13, 14, 15 is appropriately determined. Can be adjusted. Specifically, for example, when an air compressor is used as the gas supply source unit 1, when the atmosphere introduced into the air compressor is clean to a certain extent or humidity is controlled, the primary cleaning means 12 and the secondary cleaning means 12 The cleaning means 14 and the air / water separation means 13 may not be disposed, and when a gas cylinder is used as the gas supply source unit 1, the gas filled in the gas cylinder has a certain condition regarding cleanliness and humidity. Even when the above conditions are satisfied, the primary cleaning means 12, the secondary cleaning means 14, and the steam-water separation means 13 may not be provided. Therefore, the cleaning processing mechanism of the airflow adjustment unit 10 may be configured only by the secondary cleaning means 14, and more specifically, the airflow adjustment unit 10 may not have the cleaning processing mechanism, The adjusting mechanism may be composed of only the dehumidifying and drying means 15.

In the above-described embodiment, the primary cleaning means 12 and the steam-water separation means 13 are disposed on the upstream side of the storage unit 4, and the secondary cleaning means 14 and the dehumidifying and drying means 15 are disposed on the downstream side (in other words, in other words). And a cleaning mechanism and a drying mechanism are arranged on both the upstream side and the downstream side of the storage unit 4), but the relationship of these

means

12, 13, 14, 15 with the storage unit 4. The arrangement position is not limited to that in the above-described embodiment. Specifically, one or both of the secondary cleaning unit 14 and the dehumidifying / drying unit 15 may be arranged on the upstream side of the storage unit 4. Therefore, the cleaning mechanism and the drying mechanism of the airflow adjustment unit 10 may be disposed only on the upstream side of the storage unit 4. When the primary cleaning means 12 and the air / water separation means 13 are disposed upstream of the storage unit 4, the secondary cleaning means 14 and dehumidifying and drying are provided between these

means

12 and 13 and the storage unit 4. Means 15 are arranged.

In the above-described embodiment, the storage unit 4 is provided, but the storage unit 4 may not be provided. In other words, even if the carrier gas 9 is not temporarily stored by the storage unit 4, at least the carrier gas 9 is dried by the dehumidifying and drying means 15, the pressure is adjusted by the pressure adjusting means 16, and the heating by the heating means 21. And, by heating the atmosphere in the casing of the heating unit 20 including the hose housing space 24 by the heating means 23, the effect of the present invention of reducing the amount of paint and diluent used can be exhibited. .

A verification example of the effect of reducing the amount of paint and diluent used by the coating carrier gas control device of the present invention will be described with reference to FIG.

In this example, hand spray painting (hand painting) by an operator using a spray gun (cup gun) was performed. The operator is a person who has sufficient experience with hand-blown painting and can perform appropriate painting work under the painting conditions in accordance with the difference in painting conditions.

In this example, a red (PG80III lead-free E05-40X red) paint of “PG80” (urethane type: main agent / curing agent = 10/1 blend) manufactured by Kansai Paint Co., Ltd. was used.

In this embodiment, first, as a comparative example 1 for comparison with the embodiment according to the present invention, it is a conventional spray coating system, and the compressed air sent from the air compressor is directly supplied to the spray gun. When used as a gas, it was painted.

For Comparative Example 1, when the discharge pressure (coating pressure) of the carrier gas and paint from the spray gun was adjusted to about 0.250 MPa, which is the conventional standard coating pressure (Comparative Example 1-1) ) And the case where the pressure was adjusted to about 0.175 MPa lower than the standard (Comparative Example 1-2).

The dilution ratio of the paint with the solvent (that is, the ratio of the weight of the solvent to the weight of the paint) is the standard for the paint used in this example in both Comparative Example 1-1 and Comparative Example 1-2. The dilution rate was set to 70 %%.

On the other hand, as Example 1 according to the present invention, the compressed air delivered from the air compressor is processed by the coating carrier gas control device of the present invention and then used as the carrier gas supplied to the spray gun. Was done. The configuration of the coating carrier gas control device according to the present invention is the same as that shown in FIG.

For Example 1 according to the present invention, when the dilution ratio of the paint with the solvent is set to 70% by weight, which is the same as Comparative Example 1 (Example 1-1), it is set to 35% by weight, which is half of Comparative Example 1. In two cases (ie, the viscosity of the paint is high; Example 1-2).

The coating pressure for both Example 1-1 and Example 1-2 was set at 0.175 MPa MPa, which is lower than the standard pressure.

In Example 1-1 and Example 1-2, the temperature of the carrier gas 9 blown out from the socket 8A at the end of the hose 6 was 25 to 30 ° C. as a result of measurement.

In this example, the number of coats (that is, the number of times the paint was applied) was basically four. However, for Comparative Example 1-2, the amount of paint blown out due to the low coating pressure was extremely small, and the quality of the finished product could not be ensured when the number of coats was four, so the number was five. . Nevertheless, the finish of Comparative Example 1-2 was poor (in other words, a finish equivalent to that of the conventional coating of Example 1-1 was not achieved).

On the other hand, in Examples 1-1 and 1-2 according to the present invention, although the coating pressure was lower than the standard, in addition, in Example 1-2, the dilution rate was small and the viscosity of the paint was low. Despite being high, the finish was good (in other words, a finish at least equivalent to the conventional coating of Example 1-1 was achieved).

In addition, the reduction rate of the amount of paint used based on the amount of paint used in Comparative Example 1-1, which is a conventional standard coating condition, is the result of the coating pressure being low in Example 1-1. In Example 1-2, the coating pressure was low and the dilution rate was small, resulting in 43 %%%.

When the coating pressure is low, the paint blown toward the target surface of the paint is blown off before reaching the target surface due to the turbulence of the airflow caused by the carrier gas that has collided with the target surface. Therefore, it is considered that the amount of the paint actually fixed on the target surface increases and the amount of diffusion decreases. That is, it was considered that the amount of paint used decreased because the ratio of the amount fixed as a coating film to the total amount of paint blown from the spray gun increased.

From the above results, according to the coating carrier gas control device of the present invention, it is possible to ensure a good finish even if the coating pressure is reduced, as compared with the conventional spray coating method, and dilution with a solvent. It was confirmed that it was possible to ensure a good finish even if the coating pressure was reduced when the rate was reduced and the viscosity of the paint was high.

From the above results, it is also possible to reduce the amount of paint and diluent used to ensure at least the same finish as in the case of conventional standard coating conditions by 30 to 40%. It was confirmed.

Another verification example of the effect of reducing the amount of paint and diluent used by the coating carrier gas control device of the present invention will be described with reference to FIG.

In this example, automatic painting by a robot was performed.

In this example, the same paint as in Example 1 was used.

In this embodiment, first, as a comparative example 2 for comparison with the embodiment according to the present invention, a conventional spray painting system is used, and compressed air sent from an air compressor is supplied as it is to a painting module of a robot. When used as a carrier gas, it was painted.

For Comparative Example 2, the dilution ratio of the paint with the solvent is set to 70% by weight, which is the standard dilution ratio for the paint used in this example, and the carrier gas, paint, etc. from the paint module of the robot The discharge pressure (painting pressure) was set to 0.250 kgpa, which is a conventional standard painting pressure.

On the other hand, as Example 2 according to the present invention, when compressed air delivered from an air compressor is processed by the coating carrier gas control device of the present invention and then used as a carrier gas supplied to a robot coating module Painting was done. The configuration of the coating carrier gas control device according to the present invention is the same as that shown in FIG.

For Example 2 according to the present invention, the dilution ratio of the paint with the solvent was set to 50% by weight, which is smaller than that of Comparative Example 2, and the coating pressure was set to 0.175% MPa, which is lower than the standard.

In Example 2, the temperature of the carrier gas 9 blown out from the socket 8A at the end of the hose 6 was 25 to 30 ° C. as a result of measurement.

Under the above-mentioned conditions, coating was performed with the same amount of paint used and the number of coatings being twice, and the film thickness of each coating in the case of Comparative Example 2 and Example 2 was measured. In both Comparative Example 2 and Example 2, the finish of the coating was good.

As a result of measuring the film thickness of the coating, Comparative Example 2 is 19.8 μm, while Example 2 is 28.7 μm, and in Example 2, the film thickness is increased by 45% by did.

Further, when a trial calculation is made based on the results of Example 2, the amount of paint used for Comparative Example 2 is less than that of Comparative Example 2 when coating with the same film thickness of 19.8 μm as in Comparative Example 2 under the conditions of Example 2. It was found that it was reduced by 31%.

From the above results, according to the coating carrier gas control device of the present invention, when the amount of paint used is the same, the coating film thickness can be increased by about 45% compared with the conventional spray coating method. It was confirmed that it was possible. That is, in other words, according to the present invention, it is possible to reduce the amount of paint and diluent used to make the coating film thickness the same as compared with the conventional spray coating method. Was confirmed.

Referring to FIG. 4, still another verification example of the effect of reducing the amount of paint and diluent used by the coating carrier gas control device of the present invention will be described.

In this example, automatic painting by a robot was performed.

In this example, the same paint as in Example 1 was used.

In this embodiment, first, as a comparative example 3 for comparison with the embodiment according to the present invention, a conventional spray painting method is used, and compressed air sent from an air compressor is supplied as it is to a painting module of a robot. When used as a carrier gas, it was painted.

For Comparative Example 3, the dilution ratio of the paint with the solvent is set to 70% by weight, which is the standard dilution ratio for the paint used in this example, and the carrier gas, paint, etc. from the paint module of the robot are set. The discharge pressure (painting pressure) was set to 0.250 kgpa, which is a conventional standard painting pressure. As for the viscosity of the paint of Comparative Example 3, the measured value at a temperature of 20 ° C. using an Iwata viscosity cup NK-2 was 11.7 seconds.

On the other hand, as Example 3 according to the present invention, when compressed air delivered from an air compressor is processed by the coating carrier gas control device of the present invention and then used as a carrier gas supplied to a robot coating module Painting was done. The configuration of the coating carrier gas control device according to the present invention is the same as that shown in FIG.

For Example 3 according to the present invention, the dilution ratio of the paint with the solvent was set to 50% by weight, which is smaller than that of Comparative Example 3, and the coating pressure was set to 0.175% MPa, which is lower than the standard. As for the viscosity of the coating material of Example 3, the measured value at a temperature of 20 ° C. using the Iwata viscosity cup NK-2 was 14.5 seconds.

Further, in Example 3, the temperature of the carrier gas 9 blown out from the socket 8A at the end of the hose 6 was 25 to 30 ° C. as a result of measurement.

Under the above conditions, coating was performed with the number of coatings being twice so that the coating film thickness was the same, and the amount of paint used in each of Comparative Example 3 and Example 3 was measured. It was done. As a result of the coating operation, the film thickness of Comparative Example 3 was 11.0 μm and the film thickness of Example 3 was 11.3 μm μm. Moreover, the finish of the coating was favorable in both Comparative Example 3 and Example 3.

As a result of the measurement of the amount of paint used, Comparative Example 3 was 43.0 gr, while Example 3 was 28.3 gr, and in contrast to Comparative Example 3, the amount of paint used was 34. Reduced by%.

From the above results, according to the coating carrier gas control device of the present invention, the amount of paint and diluent used to make the coating film thickness the same is 34 compared with the conventional spray coating method. It was confirmed that it was possible to reduce by about %%.

DESCRIPTION OF SYMBOLS 1 Gas supply source unit 2 Gas input piping 3A Introducing piping 3B Outgoing piping 4 Storage unit 5 Connection piping 6 Hose 7 Spray gun 7a Paint cup 7a 'Paint cup 8 Coupler 8A Socket 8B Plug 8B' Plug 9 Carrier gas 10 Airflow adjustment unit 11 Gas input valve 12 Primary cleaning means 13 Air-water separation means 14 Secondary cleaning means 15 Dehumidification drying means 16 Pressure adjusting means 20 Heating unit 21 Heating means 22 Gas output valve 23 Heating means 24 Hose storage space 25 Paint heating part 26 thermometer

Claims

A drying mechanism for dehumidifying and drying the carrier gas delivered from the gas supply source unit, and a pressure adjusting means for adjusting the pressure of the carrier gas so that the pressure in the coating means to which the carrier gas is supplied becomes a predetermined pressure. And an atmosphere in a housing comprising a heating unit for heating the carrier gas so that the temperature in the coating unit becomes a predetermined temperature, and a space for housing a hose for supplying the carrier gas to the coating unit And a heating means for heating the coating carrier gas control device.
2. The coating carrier gas control apparatus according to claim 1, further comprising a storage unit that temporarily stores the carrier gas after passing through the drying mechanism in a pressurized state and then sends the carrier gas to the pressure adjusting means. .
2. The coating carrier gas control device according to claim 1, wherein the hose is covered with a heat insulating material.
2. The coating carrier gas control apparatus according to claim 1, further comprising a device branched from the hose so that the carrier gas is blown toward the coating means.
The paint carrier according to claim 1, further comprising a paint heating unit for containing the paint supplied to the painting means and heating the paint before painting using the atmosphere in the casing. Gas control device.
Each of the airflow adjustment unit including the drying mechanism and the pressure adjustment unit, the heating unit including the heating unit and the heating unit, and the storage unit, or any plurality of these units 3. The coating carrier gas control device according to claim 2, wherein a moving means is provided for the combination of units.