JP2021169070A - Painting method and painting equipment for repair paint using a spray gun - Google Patents

Abstract

To provide an application method and application apparatus for a repair coating material, using a spray gun, capable of adjusting a temperature of compressed air supplied to the spray gun.SOLUTION: An application method according to the present invention includes: a step (S1) of measuring a temperature of compressed air supplied to a spray gun 4 through a hose 2 by using a thermometer 5 assembled to the spray gun 4; a step (S2) of supplying power to a heating wire 3 attached to an inside of the hose 2 to heat the inside of the hose 2 when a temperature T of the compressed air measured by the thermometer 5 is a prescribed value T1 or lower; a step (S3) of stopping power supply to the heating wire 3 (heating) when the temperature T is a prescribed value T2 or higher; a step (S4) of operating a cold air generator 10 attached to an end part of the hose 2 when the temperature T is a prescribed value T3 or higher; and a step (S5) of stopping an operation of the cold air generator 10 when the temperature T is a prescribed value T4 or lower. Each step can be performed by an application apparatus 1 according to the present invention.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method and a coating apparatus for repairing paint using a spray gun, and is particularly suitable for use in an automobile repair factory when spraying a repair (water-based or organic) paint onto a vehicle for repair. Regarding the method of painting repair paint using a gun and the painting equipment.

In recent years, due to the growing awareness of environmental protection, water-based paints called water-diluted paints and the like are being used as repair paints in automobile repair factories. Since water and alcohols are used as diluents for water-based paints, it is important to control the temperature during painting to control the evaporation rate of water, which is a diluent, in order to improve the finish quality of painting. be.

Conventionally, a spray gun called a paint gun or the like is known as a tool for spraying a water-based paint onto a repair vehicle (see, for example, Patent Document 1). The spray gun is connected to a compressed air supply source via a long (for example, about 10 m) hose or the like, and paint is sprayed from a nozzle of the spray gun by the supplied compressed air.

Japanese Unexamined Patent Publication No. 2008-043870

Generally, the compressed air supplied to the spray gun is produced by a compressor (compressed air supply source) installed in an automobile repair factory, but the compressed air immediately after production contains moisture and is hot. It is cooled in a dryer process with cooling capacity and excess water is removed. In a general automobile repair factory, painting work is performed in a painting booth partitioned by vinyl curtains or a push-pull type painting booth, and it is difficult to block the influence of outside air temperature. Therefore, the compressed air produced by the compressor is cooled by the dryer process and then supplied to the spray gun through filters, auxiliary tanks, brass air pipes, and hoses placed on the ground. It may be affected and change to a temperature that is not suitable for painting.

In order to improve the finish quality of the paint, it is necessary to paint at an appropriate temperature according to the properties of each paint. Therefore, in addition to controlling the temperature of the paint itself, it is necessary to adjust the temperature of the compressed air. is important.

The present invention has been made in view of the above problems, and provides a method and an apparatus for applying a repair paint using a spray gun, which can improve the finish quality of the coating without impairing the workability of the coating. The purpose is to provide.

The method for applying the repair paint using the spray gun according to the present invention is as follows.
The process of measuring the temperature of compressed air supplied to the spray gun through the hose with a thermometer attached to the spray gun, and
When the temperature T of the compressed air measured by the thermometer is equal to or less than a predetermined value T1, power is supplied to the heating wire installed in the hose to heat the inside of the hose.
When the temperature T of the compressed air measured by the thermometer is equal to or higher than the predetermined value T2, the step of stopping the power supply to the heating wire and the step of stopping the power supply to the heating wire.
When the temperature T of the compressed air measured by the thermometer is equal to or higher than the predetermined value T3, the step of operating the cold air generator connected to the hose and the step of operating the cold air generator.
A step of stopping the operation of the cold air generator when the temperature T of the compressed air measured by the thermometer is equal to or less than a predetermined value T4.
It is characterized by including.

The repair paint coating device using the spray gun according to the present invention is
A heating wire that is installed over the entire length of the hose and connected to an external power supply,
A cold air generator connected to the hose and
A thermometer attached to a spray gun to which the hose is connected and measuring the temperature of compressed air supplied into the spray gun via the hose.
It is characterized by having.

In addition to the above configuration, the repair paint coating device using the spray gun according to the present invention is a cable that is inserted into the hose, one end is connected to a high voltage generator, and the other end is connected to the spray gun. May have. Further, the repair paint coating device using the spray gun according to the present invention may include a heater and a cooler, and may have a tank connected to the hose.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a method for applying a repair paint and a coating apparatus using a spray gun, which can improve the finish quality of the coating without impairing the workability of the coating. That is, according to the present invention, it is possible to adjust the temperature of the compressed air for spraying the paint so as to be within a desired temperature range suitable for painting, and the influence of the outside air temperature in cold regions, outdoors, etc. Even in a place that is easily affected, the spraying work can be performed at a temperature suitable for each repair paint, and the finish quality of the paint can be improved. The hose is routed during painting work, but since the heating wire is installed inside the hose, the workability of painting is not impaired.

It is a figure which shows typically the structure of the coating apparatus of the repair paint using the spray gun which concerns on this invention. It is an enlarged view which shows typically the internal structure of the hose shown in FIG. It is a flow chart which shows the process of the coating method of the repair paint using the spray gun which is 1st Embodiment which concerns on this invention. It is a flow chart which shows the process of the coating method of the repair paint using the spray gun which is 2nd Embodiment which concerns on this invention.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings as appropriate, but the present invention is not limited to the embodiments shown in the drawings and is appropriately modified as long as the gist of the present invention is not changed. It is possible.

FIG. 1 is a diagram schematically showing a configuration and the like of a coating device 1 for repair paint using a spray gun. The coating device 1 according to the present invention is a suitable device used when spraying a water-based paint onto a vehicle (object C to be coated) to repair the coating in an automobile repair factory or the like. In the case shown in FIG. 1, the coating device 1 is connected to a brass air pipe 24 through which compressed air produced by the compressor 20 flows. As described above, the compressed air produced by the compressor 20 is dried and cooled by the dryer 21 and passes through a filter 22 for removing dust and the like, an auxiliary tank 23 for securing the amount of air, an air pipe 24 made of brass, and the like. In the process, it changes under the influence of the outside temperature. In this regard, according to the coating apparatus 1 having the following configuration, the temperature of the compressed air supplied to the spray gun 4 can be raised to a temperature suitable for spray coating of the water-based paint, and the object to be coated C can be raised. It is possible to improve the finished quality of the water-based paint sprayed on the surface.

That is, the coating device 1 is attached to the heating wire 3 which is attached to the hose 2 over substantially the entire length and is connected to the external power source, the cold air generator 10 which is connected to the hose 2, and the spray gun 4 to which the hose 2 is connected. It has a thermometer 5 that is attached and measures the temperature of compressed air that is attached and supplied into the spray gun 4 via a hose 2. Hereinafter, each configuration will be described in sequence.

The hose 2 is a flexible member made of urethane having a long length (for example, a total length of about 10 m), and a spray gun 4 is connected to the outflow side end portion 2b. In the present embodiment, the hose 2 is connected to the tank 15 described later, but the installation of the tank 15 is optional. Further, as the hose 2, for example, various air hoses can be used, but it is preferable to select a hose having excellent heat resistance.

FIG. 2 is an enlarged view schematically showing the internal configuration of the hose 2 shown in FIG. Inside the hose 2, the heating wire 3 is inserted over its substantially overall length, more specifically, inserted from the inflow side end 2a and folded back in a U shape in the vicinity of the outflow side end 2b. It is attached by. An external power source 6 is connected to the heating wire 3 via an electric wire 6a, and by operating the external power source 6, the entire inside of the hose 2 can be heated to raise or keep the compressed air in the hose 2 warm. can. As the heating wire 3, for example, a nichrome wire can be used. By attaching the heating wire 3 over substantially the entire length of a long hose (for example, a total length of about 10 m), a sufficient amount of compressed air can be heated for use in the spray gun 4. As the heating wire 3, one wound in a coil shape may be used.

The inflow side end 2a of the hose 2 is fitted into one end (hose connection hole 7b) of a cylindrical connecting member 7 branched in a T shape. The T-shaped connector 7 includes a terminal 7a, a hose connecting hole 7b into which the hose 2 is fitted, and a connecting pipe connecting hole 7c. The terminal 7a is sealed so that compressed air does not flow out, and is provided with an insertion port for electric wires 6a and 11b so that it can be electrically connected to the outside. The end of the heating wire 3 is connected to the terminal 7a and is attached to the inside of the hose 2 through the hose connection hole 7b. The heating wire 3 is operated by operating an external power source 6 detachably connected to the terminal 7a. Can be powered. Further, a connecting pipe 8 connected to the compressed air supply source side is connected to the connecting pipe connecting hole 7c, and the compressed air supplied via the air pipe 24 operates the pressure valve 25 and the valve 16 described later. As a result, the compressed air flows into the hose 2 through the connecting pipe connecting hole 7c and the hose connecting hole 7b (the flow of compressed air is indicated by an arrow in FIG. 2).

The spray gun 4 is an instrument widely used in the field of painting, which can spray paint from the nozzle 4b by pulling the trigger 4a. A hose connection hole 4c is provided in the handle portion of the spray gun 4, a container 9 containing water-based paint is attached to the gun body portion, and one end is a hose inside the handle portion and the gun body portion. A compressed air supply passage 4d that opens into the connection hole 4c and the other end opens into the nozzle 4b is formed. Further, a paint supply passage is formed in the gun body portion so that one end communicates with the container 9 and the other end communicates with the nozzle 4b. By operating the trigger 4a to open and close the compressed air supply passage 4d, compressed air can be obtained. The mixed water-based paint can be sprayed toward the object to be coated C.

The cold air generator 10 is an instrument capable of cooling and discharging the inflow air, and is connected to the hose 2 by being attached to the connecting pipe 8. As the cold air generator 10, for example, a cold air generator (trade name “jet cooler”) manufactured by Nippon Seiki Co., Ltd. can be used. The cold air generator 10 may be attached to the inflow side end 2a of the hose 2 or the connecting member 7.

A sensor unit 5a constituting the thermometer 5 is incorporated in the lower end side of the handle portion of the spray gun 4, and the compressed air supplied into the spray gun 4 (compressed air supply passage 4d) through the hose 2 The temperature T can be measured. The thermometer 5 includes a sensor unit 5a and a display unit 5b, and the measurement result is displayed on the display unit 5b.

According to the present invention having the above configuration, since the thermometer 5 is attached to the spray gun 4, the paint is sprayed by operating the heating wire 3 or the cold air generator 10 while checking the temperature measurement result. The compressed air can be adjusted to stay within the desired temperature range, and even in places that are easily affected by the outside air temperature, such as cold regions and outdoors, spraying work can be performed at a temperature suitable for each repair paint. Can be done. The compressed air whose temperature is regulated in the hose 2 stays in the hose 2 in which the heating wire 3 is incorporated until it is injected through the spray gun 4 when the trigger 4a is pulled, and is affected by the outside air temperature. Hard to receive. Further, although the hose 2 is routed during the painting work, since the heating wire 3 is mounted inside the hose 2, the workability of the painting is not impaired.

According to the present invention having the above configuration, it is possible to provide a repair paint coating device 1 using a spray gun, which can improve the finished quality of coating without impairing the workability of coating.

When electrostatic coating is performed using the coating apparatus according to the present invention, it may have the following configuration. That is, when a so-called electrostatic gun is used as the spray gun 4, the coating device 1 is inserted into the hose 2, one end is connected to the high voltage generator 11, and the other end is connected to the spray gun 4. You may have twelve twelve. By inserting the cable 12 for electrostatic coating into the hose 2 in this way, the workability is improved without interfering with the painting work as compared with the case where the cable 12 is wired separately from the hose 2. In the present embodiment, one end of the cable 12 is detachably connected to the terminal 7a of the T-shaped connector 7, and the other end is connected to the spray gun 4 through the hose 2. The cable 12 is coated with a heat resistant material. The high voltage generator 11 includes a ground wire 11a and an electric wire 11b connected to the cable 12 via a terminal 7a. By operating the high voltage generator 11, electric power for electrostatic coating can be generated. It can be supplied to the spray gun 4 via the cable 12. It is also possible to perform electrostatic coating using the spray gun 4 by making the spray gun 4 made of metal and connecting the cable 12 to the spray gun 4 to charge the spray gun 4.

The coating device 1 may optionally include a heater 13 and a cooler 14, and may have a tank 15 to which the hose 2 is connected. By providing such a tank 15, the temperature of the compressed air supplied to the hose 2 can be raised or cooled even in the tank 15, and when used in combination with the heating wire 3 or the like, the compressed air supplied to the spray gun 4 can be compressed. The temperature of the air can be adjusted in a shorter time.

The tank 15 is a hollow body, and is provided with an air supply hole 15a and an exhaust hole 15b. An air pipe 24 is connected to the air supply hole 15a, and compressed air can be filled and accommodated in the tank 15 by operating the pressure valve 25. Further, a connecting pipe 8 is connected to the exhaust hole 15b, and by operating the valve 16, compressed air in the tank 15 can be pumped toward the hose 2 through the connecting pipe connecting hole 7c. A heater 13 (for example, a sheathed heater) and a cooler 14 that are generally used are incorporated in the tank 15.

Next, a method of applying the repair paint using the spray gun according to the present invention will be described.

FIG. 3 is a flow chart showing a process of a method of applying a repair paint using a spray gun according to the first embodiment, in which the temperature of compressed air supplied to the spray gun 4 through the hose 2 is measured. A heating wire installed in the hose 2 when the temperature T of the compressed air measured by the thermometer 5 is equal to or less than a predetermined value T1 in the step (S1) of measuring with the thermometer 5 attached to the spray gun 4. Power is supplied to the heating wire 3 (heating) in the step (S2) of supplying power to 3 to heat the inside of the hose 2 and when the temperature T of the compressed air measured by the thermometer 5 is equal to or higher than a predetermined value T2. ), And a step of operating the cold air generator 10 attached to the end of the hose 2 when the temperature T of the compressed air measured by the thermometer 5 is equal to or higher than a predetermined value T3 (S3). S4) and a step (S5) of stopping the operation of the cold air generator 10 when the temperature T of the compressed air measured by the thermometer 5 is equal to or less than a predetermined value T4. Each step can be carried out by the coating apparatus 1 described above. Hereinafter, each step (S1 to S5) will be described.

<S1> First, the temperature of the compressed air supplied to the spray gun 4 through the hose 2 is measured by a thermometer 5 attached to the spray gun 4.

<S2> In this step, it is determined whether or not the temperature T of the compressed air measured by the thermometer 5 is a predetermined value T1 or less, and if the temperature T is a predetermined value T1 or less, the external power source 6 is turned on. It is operated to supply electric power to the heating wire 3 to heat the inside of the hose 2. The predetermined value T1 is set according to the properties of the water-based paint, the injection distance to the object to be coated C, and the like (for example, T1 = 13 ° C.). The supplied electric power is set according to the target temperature, the length of the heating wire 3, and the like.

<S3> In this step, it is determined whether or not the temperature T is equal to or higher than the predetermined value T2, and if the temperature T is equal to or higher than the predetermined value T2, the power supply (heating) to the heating wire 3 is stopped. The predetermined value T2 is set at a temperature higher than T1 according to the properties of the water-based paint (for example, T2 = 20 ° C.).

<S4> In this step, it is determined whether or not the temperature T of the compressed air measured by the thermometer 5 is a predetermined value T3 or more, and when the temperature T is a predetermined value T3 or more, the end of the hose 2 The cold air generator 10 attached to is operated. The predetermined value T3 is set according to the properties of the water-based paint and the like. By setting T2 <T3, the power supply (heating) to the heating wire 3 incorporated in the hose 2 is stopped during the execution of this step (S4).

<S5> In this step, it is determined whether or not the temperature T of the compressed air measured by the thermometer 5 is a predetermined value T4 or less, and when the temperature T is a predetermined value T4 or less, the cold air generator 10 is used. Stop operation. The predetermined value T4 is set at a temperature lower than T3 according to the properties of the water-based paint and the like.

If the painting work is continuing after the completion of the S5 step, the process returns to the S1 step after an arbitrary time, and each step (S1 to S5) is re-executed. By repeatedly executing these steps (S1 to S5), the temperature of the compressed air supplied to the spray gun 4 is adjusted. In the case shown in FIG. 3, the steps S1, S2, S3, S4 and S5 are executed in the order, but the execution order of the steps S2 to S5 does not matter (for example, the steps S4 and S5 precede the steps S2 and S3). May be executed, or S2, S4, S3, and S5 steps may be executed in this order.) As long as the temperature T is equal to or less than the predetermined value T1, the power is supplied to the heating wire 3, that is, as long as the heating state in the hose 2 continues and the temperature T is equal to or less than the predetermined value T3, the operation of the cold air generator 10 That is, the cooled state of the compressed air continues. According to the coating method according to the present embodiment, the compressed air for spraying the coating material can be adjusted so as to be within a desired temperature range, and the coating material can be applied at a temperature suitable for coating the water-based coating material.

FIG. 4 is a flow chart showing the steps of the method of applying the repair paint using the spray gun according to the second embodiment, and in addition to the above steps (S1 to S5), each of the following steps (S6). , S7), that is, when the temperature T of the compressed air measured by the thermometer 5 is equal to or less than a predetermined value T5, the heater 13 attached to the tank 15 to which the hose 2 is connected is operated to operate the tank 15. It includes a step of heating the inside (S6) and a step of stopping the operation of the heater 13 (S7) when the temperature T of the compressed air measured by the thermometer 5 is equal to or higher than a predetermined value T6. The predetermined values T5 and T6 are set according to the heating capacity of the heating wire 3 and the like.

The above steps (S6 to S7) are executed after the temperature measuring step (S1), but the execution order of the steps S2 to S7 does not matter. For example, when the heater 13 is used as an auxiliary to the heating wire 3, T1 <T5 and T2 <T6 are set, and as shown in FIG. 4, the S6 step is executed after the S2 step, and S7 The S3 step may be executed after the step. As long as the temperature T is equal to or lower than the predetermined value T5, the operation of the heater 13, that is, the heating state in the tank 15 continues. According to the coating method including the above steps (S1 to S7), the temperature of the compressed air supplied to the spray gun 4 is adjusted by using the heating wire 3 attached to the hose 2 and the heater 13 attached to the tank 15. The temperature can be raised.

The present invention is not limited to the above-described embodiment or embodiment, and various modifications can be made without departing from the spirit of the invention. For example, the present invention can be applied to repair paints other than water-based paints.

The present invention can be used as a method for applying a repair paint using a spray gun or as a device for applying a repair paint using a spray gun.

1 Painting device 2 Hose 2a Inflow side end 2b Outflow side end 3 Heating wire 4 Spray gun 4a Trigger 4b Nozzle 4c Hose connection hole 4d Compressed air supply passage 5 Thermometer 6 External power supply 7 Connector 7a Terminal 7b Hose connection hole 7c Connection pipe connection hole 8 Connection pipe 9 Container 10 Cold air generator 11 High voltage generator 12 Cable 13 Heater 14 Cooler 15 Tank 15a Air supply hole 15b Exhaust hole 16 Valve 20 Compressor 21 Dryer 22 Filter 23 Auxiliary tank 24 Air piping 25 Pressure valve C Object to be coated

Claims (4)

The process of measuring the temperature of compressed air supplied to the spray gun through the hose with a thermometer attached to the spray gun, and
When the temperature T of the compressed air measured by the thermometer is equal to or less than a predetermined value T1, power is supplied to the heating wire installed in the hose to heat the inside of the hose.
When the temperature T of the compressed air measured by the thermometer is equal to or higher than the predetermined value T2, the step of stopping the power supply to the heating wire and the step of stopping the power supply to the heating wire.
When the temperature T of the compressed air measured by the thermometer is equal to or higher than the predetermined value T3, the step of operating the cold air generator connected to the hose and the step of operating the cold air generator.
A step of stopping the operation of the cold air generator when the temperature T of the compressed air measured by the thermometer is equal to or less than a predetermined value T4.
A method of applying a repair paint, which comprises. A heating wire that is installed over the entire length of the hose and connected to an external power supply,
A cold air generator connected to the hose and
A thermometer attached to a spray gun to which the hose is connected and measuring the temperature of compressed air supplied into the spray gun via the hose.
A repair paint coating device using a spray gun, which is characterized by having. The apparatus for applying a repair paint using a spray gun according to claim 2, further comprising a cable inserted into the hose, one end connected to a high voltage generator, and the other end connected to the spray gun. .. The apparatus for applying a repair paint using a spray gun according to claim 2 or 3, further comprising a heater and a cooler, and having a tank connected to the hose.

Images