JP2007117938A - Coating method of vehicle body and coating booth for vehicle body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating booth for a vehicle body capable of rapidly coating the vehicle body without deteriorating the coating quality of the vehicle body. <P>SOLUTION: The coating booth 1 is constituted so as to spray coating from a coating machine 13 in the coating zone in a coating chamber 3 to coat the outer surface of the vehicle body 2. In the coating booth 1, air conditioning air A1 is allowed to flow down from the ceiling side of the coating chamber 3 and contaminated air A2 containing the coating mist over-sprayed from the coating machine 13 is discharged to the flow side of the coating chamber 3. At the time of coating, air not containing the coating is sent under pressure from an air pump 21 to be spayed on the bottom part of the vehicle body 2 through air piping 22, a flexible hole 27 and a branch pipe 23. As a result, air is supplied into the space 38 in the vehicle body 2 through the through-hole provided to the bottom part of the vehicle body 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle body painting method for painting a vehicle body such as an automobile, and a vehicle body painting booth.

  In general, when atomization is applied to the vehicle body of an automobile in a paint booth, the contaminated air containing paint mist is filled in the paint chamber due to overspray. In the painting booth, vehicle bodies having different painting colors are mixed and conveyed. Therefore, if the next vehicle body is painted while the paint mist remains in the painting chamber, there arises a problem that the coating quality is impaired by the color fog. In order to solve this problem, in conventional painting booths, air-conditioned air flows down from the air supply chamber formed in the ceiling into the painting chamber, and contaminated air containing paint mist oversprayed from the coating machine is applied to the painting chamber. The air is exhausted to an exhaust chamber formed below.

  In addition, a technique for preventing the paint mist from flowing out by forming an air curtain at the entrance / exit of the painting zone in a painting booth has been proposed (see, for example, Patent Document 1).

  In the automobile painting line, a plurality of vehicle bodies are continuously conveyed, and painting is performed with the vehicle bodies temporarily stopped in the painting zone. Then, the vehicle body that has been painted is carried out of the painting zone, and the next vehicle body is sequentially carried into the painting zone. In order to increase the operation efficiency of this painting line, it is necessary to shorten the time interval (tact time) for painting each vehicle body. However, since the vehicle body has a space inside the body (the interior space of the body), when the downflow air is supplied to the painting chamber, the paint mist oversprayed from the coating machine is drawn from the window of the vehicle body to the body. It gets into the inner space. Therefore, if the paint time interval is shortened, the paint mist inside the body cannot be exhausted sufficiently. In this case, the next vehicle body is painted with the paint mist remaining, and the problem of poor painting due to color fogging occurs.

  The inventor of the present application is examining a method of exhausting the paint mist in the interior space of the vehicle body by blowing air from below the vehicle body, but a paint booth that embodies that method has not been put into practical use.

Incidentally, Patent Document 2 discloses a painting booth in which a silencer duct is provided on the exhaust chamber side, and air supplied to the silencer duct is discharged to the bottom surface of the vehicle body in the painting chamber.
Japanese Patent Laid-Open No. 11-309396 JP-A-5-168990

  By the way, the painting booth of patent document 2 reduces generation | occurrence | production of noise by discharging | emitting air to the bottom face of a vehicle body from the muffler duct by the side of an exhaust chamber, and restricting the drift of the air in a painting chamber. Even when the paint booth having this configuration is used, it is difficult to exhaust the paint mist in the interior space of the body. Specifically, a plurality of through holes of about 5 cm are provided at the bottom of the vehicle body, but the vehicle body is carried on a carriage and is far from the muffler duct on the exhaust chamber side. Therefore, the air discharged from the muffler duct hardly enters the body internal space from the bottom through hole. Therefore, the paint mist in the interior space of the body cannot be exhausted, and the problem of poor painting cannot be solved.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle body painting method and a vehicle body painting booth that can perform painting quickly without deteriorating the painting quality of the vehicle body. Is to provide.

  In order to solve the above-mentioned problem, in the invention according to claim 1, the outer surface of the vehicle body is painted by spraying a paint from a painting machine in the painting zone in the painting chamber, and the conditioned air is applied from the ceiling side of the painting chamber. In the vehicle body painting method in which the polluted air containing the paint mist oversprayed from the painting machine is exhausted to the floor side of the painting chamber, The vehicle body is coated on the outer surface of the vehicle body while suppressing intrusion of the paint from the window portion of the vehicle body to the interior space of the vehicle body by being supplied to the interior space of the vehicle body The gist of this is the painting method.

  According to the first aspect of the present invention, the outer surface of the vehicle body is painted by spraying the paint from the painting machine in the painting zone in the painting chamber. At the time of painting the vehicle body, a gas not containing paint is supplied to the interior space of the body through the bottom of the vehicle body. Thereby, the body internal space becomes positive pressure, and the air in the body internal space is pushed out from the window portion of the vehicle body. Therefore, the paint mist oversprayed from the coating machine is prevented from entering the body internal space from the window of the vehicle body. Even if the paint mist enters the interior space of the body, by supplying gas to the interior space of the body, the paint mist is discharged to the outside from the window of the vehicle body and further acts as a downflow air conditioner that acts inside the paint chamber. The paint mist is discharged from the painting chamber by air. If it does in this way, the paint mist oversprayed from the coating machine in the coating room can be reliably discharged from the coating room in a short time. Therefore, the painting can be performed quickly without deteriorating the painting quality of the vehicle body, and the painting efficiency can be increased.

  The invention according to claim 2 is provided with a painting room in which a painting machine for painting the outer surface of the vehicle body is provided in the painting zone, and conditioned air is allowed to flow down from the ceiling side of the painting room. In a vehicle body painting booth in which contaminated air containing oversprayed paint mist is exhausted to the floor side of the painting chamber, a gas supply source for pumping a gas not containing paint, and a pressure feed from the gas supply source A pipe that guides the generated gas to the coating zone, and an introduction port that is connected directly or indirectly to the pipe at the time of painting, and is disposed at a position protruding above the floor surface of the painting chamber The gist of the vehicle booth is characterized by comprising a gas discharge member that has a possible discharge port and blows the gas toward a through hole provided in the bottom of the vehicle body. .

  According to the invention described in claim 2, the outer surface of the vehicle body is painted by spraying the paint from the painting machine in the painting zone in the painting chamber. At the time of painting the vehicle body, a gas not containing paint is pumped by the gas supply source, led to the painting zone through the pipe, and introduced into the inlet of the gas discharge member. The discharge port of this gas discharge member is arranged at a position protruding upward from the floor surface of the painting chamber, and by blowing gas from the discharge port toward the through hole at the bottom of the vehicle body, the gas passes through the through hole. It is reliably supplied to the internal space of the body. Thereby, the body internal space becomes positive pressure, and the air in the body internal space is pushed out from the window portion of the vehicle body. As a result, the paint mist oversprayed from the coating machine is prevented from entering the body internal space from the window of the vehicle body. Even if the paint mist enters the interior space of the body, by supplying gas from the bottom through hole to the interior space of the body, the paint mist is discharged to the outside of the vehicle body and further flows down into the paint chamber. The paint mist is discharged from the painting chamber by the conditioned air. If it does in this way, the paint mist oversprayed from the coating machine in the coating room can be reliably discharged from the coating room in a short time. Therefore, the painting can be performed quickly without deteriorating the painting quality of the vehicle body, and the painting efficiency can be increased.

  According to a third aspect of the present invention, in the second aspect, the gas discharge member is fixed to a carriage for transporting the vehicle body to the painting zone, and distributes the gas introduced from the introduction port. A branch pipe that discharges from a plurality of outlets, and connects the base end of a flexible or stretchable relay pipe to the pipe, and lifts and lowers the distal end of the relay pipe using an actuator. The gist is that the leading end of the relay pipe is configured to be brought into contact with and separated from the introduction port.

  According to the third aspect of the present invention, the base end of the flexible or stretchable relay pipe is connected to the pipe, and when painting the vehicle body, the tip of the relay pipe is used using the actuator. Is raised, the leading end of the relay pipe is connected to the inlet of the gas discharge member. In this gas discharge member, the gas introduced from the inlet is distributed and sprayed from the plurality of outlets toward the bottom of the vehicle body. Since this gas discharge member is fixed to a carriage for transporting the vehicle body, each discharge port can be accurately arranged at a position corresponding to a plurality of through holes provided at the bottom of the vehicle body. Gas can be reliably supplied to the internal space of the body through the through hole. Further, after painting is completed, the tip of the relay pipe is lowered using the actuator, so that the vehicle body and the carriage can be carried out of the painting zone without contacting the relay pipe.

  According to a fourth aspect of the present invention, in the second aspect, the proximal end portion of the relay pipe having flexibility or stretchability is connected to the pipe, and the introduction port of the gas discharge member is connected to the distal end portion of the relay pipe. The gist of the invention is that the discharge port is brought into and out of contact with the through hole by moving the discharge port up and down using an actuator in a state where the discharge port is connected.

  According to invention of Claim 4, the base end part of the relay pipe which has flexibility or a stretching property is connected to piping, and the inlet of a gas discharge member is connected to the front-end | tip part of the relay pipe . At the time of painting the vehicle body, the discharge port of the gas discharge member is raised using the actuator, so that the discharge port can be brought close to the through hole at the bottom of the vehicle body. Thereby, gas can be reliably supplied to body internal space through the through-hole. Further, by lowering the discharge port of the gas discharge member using the actuator after the completion of painting, the vehicle body and the carriage can be carried out of the paint zone without contacting the gas discharge member.

  As described above in detail, according to the first to fourth aspects of the present invention, painting can be performed quickly without deteriorating the painting quality of the vehicle body.

[First Embodiment]

  Hereinafter, a first embodiment in which the present invention is embodied in a painting booth for painting a vehicle body of an automobile will be described in detail with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view showing a painting booth in the present embodiment, and FIG. 2 is a side view of the painting booth.

  As shown in FIG. 1, the painting booth 1 is used to form a coating film on the outer surface of the vehicle body 2 by spraying the paint on the vehicle body 2, and is provided in a production line for tact operation. ing. The painting booth 1 includes a painting chamber 3 for painting the vehicle body 2, an air supply chamber 4 provided on the upper side of the painting chamber 3 for supplying down-flowing conditioned air A1 to the painting chamber 3, An exhaust chamber 5 is provided below the coating chamber 3 for exhausting the air in the coating chamber 3.

  The floor portion 7 of the painting chamber 3 is formed of an insulator-like member (grating), and the floor portion 7 is provided with a conveyor 9 for conveying the vehicle body 2 placed on the carriage 8 one by one. . In the painting chamber 3, painting robots 11 are provided on both the left and right sides of the conveyor 9, and the vehicle body 2 is painted by a painting machine 13 attached to the arm 12 of the painting robot 11.

  The exhaust chamber 5 sucks the contaminated air A2 in the painting chamber 3 by a suction force of an exhaust fan (not shown). The contaminated air A2 includes paint mist oversprayed from the coating machine 13 in the coating chamber 3. In addition, an exhaust duct 15 that exhausts air purified in the exhaust chamber 5 to the outside is provided on the side wall of the exhaust chamber 5. The air discharged from the exhaust duct 15 is pumped by a fan (not shown), and is led to the air supply chamber 4 again through the air supply duct 16.

  A filter 18 is disposed in the supply chamber 4 along the ceiling surface of the painting chamber 3. Then, the air pumped into the air supply chamber 4 is caused to flow down toward the coating chamber 3 as conditioned air A1 having a predetermined wind speed (for example, 0.3 m / sec) through the filter 18.

  As shown in FIGS. 1 and 2, in the exhaust chamber 5 in the present embodiment, an air pump 21 as a gas supply source that pumps air (air) that does not contain paint, and air fed from the air pump 21 are fed. An air pipe 22 is provided as a pipe leading to the painting zone R1 of the vehicle body 2 in the painting chamber 3. The air pump 21 may be provided outside the exhaust chamber 5 instead of inside. A gas such as an inert gas (such as nitrogen or argon) can be used in place of air (air), but air is also preferable from the viewpoint of cost.

  Further, a branch pipe 23 as a gas discharge member is fixed to the carriage 8 for conveying the vehicle body 2. The branch pipe 23 has an introduction port 24 for introducing air, and a plurality of discharge ports 25 and 26 for distributing and discharging the air introduced from the introduction port 24. The inlet 24 of the branch pipe 23 is indirectly connected to the air pipe 22 of the exhaust chamber 5 via a flexible hose 27 as a relay pipe having flexibility or stretchability.

  Specifically, as shown in FIG. 3, the flexible hose 27 has a proximal end connected to the air pipe 22 and a distal end connected to a piston rod 29 of an air cylinder 28 as an actuator. The air cylinder 28 is driven by supplying air from the air pipe 22 through a valve (not shown). When the air cylinder 28 is driven, the tip of the flexible hose 27 is moved up and down by the vertical movement of the piston rod 29. 3A shows a state where the tip of the flexible hose 27 is lowered, and FIG. 3B shows a state where the tip of the flexible hose 27 is raised. By driving the air cylinder 28 to raise the tip of the flexible hose 27, the tip of the flexible hose 27 is connected to the inlet 24 of the branch pipe 23 on the cart 8 side.

  In the present embodiment, guide members 31 and 32 are provided at the connection portion between the inlet 24 of the branch pipe 23 and the flexible hose 27 to prevent air leakage by bringing the respective openings into close contact. These guide members 31 and 32 are soft members made of resin, rubber, or the like, and are formed so that the opening area increases toward the end. Further, the guide member 31 on the flexible hose 27 side serving as the air supply side is formed smaller than the guide member 32 on the introduction port 24 side of the branch pipe 23. Thereby, the guide member 31 on the flexible hose 27 side is pressed against the guide member 32 on the introduction port 24 side to facilitate close contact.

  As shown in FIG. 2, the plurality of discharge ports 25 and 26 of the branch pipe 23 project toward the bottom of the vehicle body 2, and the discharge port 25 arranged on the inner side is the bottom of the vehicle body 2. It abuts on the edge (floor surface) of the through hole 34 provided on the (floor) (see FIG. 4). A soft guide member 35 made of resin, rubber, or the like is provided at the tip of the discharge port 25 in order to ensure adhesion with the vehicle body 2 (floor surface). Further, the discharge port 26 located on the outer side of the branch pipe 23 protrudes toward the wheel housing 36 of the vehicle body 2. The flow rate of the air A0 discharged from each discharge port 25 of the branch pipe 23 is such that the contaminated air containing the paint mist does not enter the body internal space 38 from the window 37 of the vehicle body 2. It is set as appropriate based on the opening area and the downflow air flow rate in the painting chamber 3.

  Next, a method for painting the vehicle body 2 in the present embodiment will be described.

  First, the conveyor 9 is driven to transport the vehicle body 2 placed on the carriage 8, and the vehicle body 2 is temporarily stopped in the painting zone R <b> 1 in the painting chamber 3. Thereafter, the air cylinder 28 is driven to expand and contract, the tip of the flexible hose 27 is raised and connected to the inlet 24 of the branch pipe 23 (see FIG. 3B). As a result, the air A0 pumped from the air pump 21 to the air pipe 22 is introduced into the branch pipe 23 via the flexible hose 27, and the air A0 is discharged from the discharge ports 25 and 26 of the branch pipe 23.

  Then, in a state where the air A0 is sprayed from the discharge ports 25 and 26 of the branch pipe 23 to the bottom of the vehicle body 2 in this way, the paint is sprayed from the coating machine 13 to the outer surface of the vehicle body 2 to perform coating. . At the time of painting, the conditioned air A2 including the paint mist oversprayed from the coating machine 13 in the painting chamber 3 is caused to flow into the painting chamber 3 from the air supply chamber 4 formed on the ceiling. The gas is exhausted to an exhaust chamber 5 formed below the painting chamber 3. Here, since the air A0 blown from each discharge port 25 of the branch pipe 23 is supplied to the body internal space 38 through the through hole 34 at the bottom of the body, the paint mist oversprayed from the coating machine 13 is supplied to the body internal space 38. Intrusion is suppressed. Further, since the air A0 is blown from the discharge ports 26 of the branch pipes 23 to the wheel housing 36 where the down-flow conditioned air A1 in the painting chamber 3 is difficult to act, the paint mist that has entered the space of the wheel housing 36 is surely obtained. Exhausted.

  And after completion | finish of coating, the front-end | tip of the flexible hose 27 is lowered | hung by driving and contracting the air cylinder 28, and it separates from the inlet 24 of the branch pipe 23 (refer Fig.3 (a)). Thereafter, the conveyor 9 is driven to carry out the painted vehicle body 2 from the painting zone R1 of the painting chamber 3, and to carry the unpainted vehicle body 2 into the painting zone R1 of the painting chamber 3, and the vehicle body. 2. Paint 2

  In this way, in the painting booth 1 of the present embodiment, the paint mist oversprayed from the painting machine 13 is discharged in a short time, so that it is possible to paint each vehicle body 2 of different colors sequentially with a fast tact. Thus, the problem that the coating quality is impaired by the color fog is solved.

  Incidentally, as another method for preventing paint color fogging, a method of sucking and exhausting paint mist (contaminated air) that has entered the body internal space 38 using a suction device is conceivable. It is difficult to completely recover the spread paint mist in a short time. Furthermore, since the paint adheres to the suction port of the suction device, a separate cleaning process for the suction port is required to maintain the recovery efficiency. Therefore, a method of collecting the paint mist inside the vehicle body using the suction device is not practical.

  As described above in detail, according to the present embodiment, the following effects can be obtained.

  (1) In the painting booth 1 according to the present embodiment, the vehicle body 2 is discharged from each discharge port 25 of the branch pipe 23 fixed to the carriage 8 over the entire period from the start to the end of painting of the vehicle body 2. Air A0 is blown toward the through hole 34, and the air A0 is supplied to the body internal space 38 through the through hole 34. As a result, the body internal space 38 becomes positive pressure, and the air in the body internal space 38 is pushed out from the window portion 37 of the vehicle body 2. As a result, the paint mist oversprayed from the coating machine 13 is prevented from entering the body internal space 38 from the window 37 of the vehicle body 2. Further, even if the paint mist enters the body internal space 38, by supplying the air A 0 to the body internal space 38, the paint mist is discharged to the outside of the vehicle body 2 and further acts in the painting chamber 3. The paint mist is discharged from the coating chamber by the conditioned air A1 of the flow. If it does in this way, the paint mist oversprayed from the coating machine 13 in the coating chamber 3 can be reliably discharged | emitted from the coating chamber 3 in a short time. Therefore, the vehicle body 2 can be painted quickly without deteriorating the coating quality. Specifically, in the painting booth 1, the tact time can be shortened to about 1 minute, and the painting efficiency of the vehicle body 2 can be increased.

  (2) In the painting booth 1 of the present embodiment, at the start of painting of the vehicle body 2, the distal end portion of the flexible hose 27 is raised using the air cylinder 28, and the distal end portion introduces the branch pipe 23. The air A0 that is connected to the port 24 and is introduced from the introduction port 24 is distributed and discharged from the plurality of discharge ports 25 and 26 to the bottom of the vehicle body 2. Since the branch pipe 23 is fixed to the carriage 8 for transporting the vehicle body 2, the discharge ports 25 are accurately arranged at positions corresponding to the plurality of through holes 34 provided at the bottom of the vehicle body 2. The air A0 can be reliably supplied to the body internal space 38 through the through holes 34. After the painting is finished, the tip of the flexible hose 27 is lowered using the air cylinder 28, so that the vehicle body 2 and the carriage 8 can be carried out from the painting zone R1 without contacting the flexible hose 27. it can.

  (3) Since the air supply path can be shared by using the branch pipe 23 having the plurality of discharge ports 25 and 26 as in the present embodiment, it is necessary to provide an air cylinder 28 for each of the discharge ports 25 and 26. Absent. Therefore, the complexity of the equipment in the painting chamber 3 can be avoided.

  (4) In the case of the present embodiment, since the air A0 is blown from the discharge port 26 of the branch pipe 23 toward the wheel housing 36 of the vehicle body 2, the paint mist that has entered the space of the wheel housing 36 is surely discharged. can do.

  (5) In the case of the present embodiment, the air cylinder 28 as an actuator operates based on the air supplied from the air pump 21, so there is no need to separately prepare a gas supply source for the air cylinder 28. In addition to the air cylinder 28, a hydraulic cylinder or an electric motor may be used as the actuator. However, since a general paint contains a flammable solvent, the use of the air cylinder 28 as in the present embodiment eliminates the need for an explosion-proof structure as in the case of using an electric motor, and thus is practically preferable. .

(6) In the case of the present embodiment, the air cylinder 28 and the flexible hose 27 are arranged at positions directly below the vehicle body 2, so that the paint hardly adheres to them and cleaning is performed to remove dirt. Maintenance costs such as work can be reduced.
[Second Embodiment]

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  The painting booth 1 of the present embodiment is different from the first embodiment in the piping configuration on the downstream side of the air piping 22, and other configurations are the same as those in the first embodiment. Hereinafter, the piping configuration will be described in detail.

  As shown in FIG. 5, at the position corresponding to the through hole 34 on the vehicle body 2 side and the position corresponding to the wheel housing 36, the base ends of the plurality of flexible hoses (relay pipes) 41 and 42 are the air pipes 22. It is connected to the. As shown in FIGS. 5 and 6, the flexible hose 41 at the position corresponding to the through hole 34 is shorter than the flexible hose 42 at the position corresponding to the wheel housing 36, and the tip portion thereof is an air nozzle (gas discharge member) 43. Are connected to the inlet 44. The flexible hose 41 is connected to the piston rod 29 of the air cylinder 28. By driving the air cylinder 28 to raise and lower the discharge port 45 of the air nozzle 43, the discharge port 45 contacts the through hole 34. It has come to be separated. 6A shows a state in which the distal end portion of the flexible hose 41 is lowered, and FIG. 6B shows a state in which the distal end portion of the flexible hose 41 is raised. Further, a soft guide member 46 made of resin, rubber, or the like is provided at the discharge port 45 of the air nozzle 43 in order to ensure adhesion with the vehicle body 2 (floor surface).

  The piston rod 29 of the air cylinder 28 is also connected to the flexible hose 42 at a position corresponding to the wheel housing 36, and the discharge port 47 of the flexible hose 42 is raised and lowered by driving the air cylinder 28. Yes.

  In the painting booth 1 configured as described above, when the vehicle body 2 is stopped in the painting zone R1 in the painting chamber 3, the discharge ports 45 of the air nozzles 41 are raised by the air cylinders 28, thereby The outlet 45 is brought into contact with the periphery of the through hole 34 on the vehicle body 2 side. As a result, the air A 0 is reliably supplied from the discharge port 45 of the air nozzle 43 to the body internal space 38 through the through hole 34. Further, by raising the discharge port 47 of each flexible hose 42 by each air cylinder 28, the discharge port 47 is brought close to the wheel housing 36. Thereby, the air A0 is reliably blown from the discharge port 47 of the flexible hose 42 to the space of the wheel housing 36.

  Then, the coating is performed by spraying the paint from the coating machine 13 to the outer surface of the vehicle body 2 in a state where the air A0 is sprayed from the bottom of the vehicle body 2 to the inside from the discharge ports 45 and 47. After the completion of the coating, the air cylinder 28 is driven to lower the discharge ports 45 and 47. Thereby, the vehicle body 2 can be carried out from the coating zone R1 without contacting the flexible hose 42 or the air nozzle 43.

  Even with this configuration, air A0 can be reliably supplied to the body internal space 38 through the through-hole 34 as in the first embodiment, and the paint mist oversprayed from the coating machine 13 can be supplied. Intrusion into the body internal space 38 is suppressed. In addition, by blowing air A0 toward the wheel housing 36, the paint mist that has entered the space of the wheel housing 36 can be reliably discharged. Therefore, the paint mist in the painting chamber 3 can be reliably discharged from the painting chamber 3 in a short time, and the vehicle body 2 can be painted quickly without deteriorating the painting quality.

  Further, in the case of the painting booth 1 of the present embodiment, since the carriage 8 is not provided with a branch pipe, the manufacturing cost of the carriage 8 can be suppressed. That is, in the first embodiment, when the size of the vehicle body 2 and the position of the through hole 34 are different depending on the vehicle type, it is necessary to change the piping configuration of the branch pipe 23 of the carriage 8. This must be done for the trolley 8. On the other hand, in this Embodiment, what is necessary is just to change the installation position of the air cylinder 28 or the flexible hoses 41 and 42 according to a vehicle type, and can respond to a vehicle type change easily.

  Further, in the case of the present embodiment, since an air supply path (passage composed of the flexible hose 42 and the air nozzle 43) is provided for each through hole 34, one of the air supply paths is clogged or the air cylinder 28 is broken. Even in the case of the failure, the air A0 can be reliably supplied to the body internal space 38 from another air supply path.

  In addition, you may change each embodiment of this invention as follows.

In the second embodiment, the flexible hose 41 is raised by the air cylinder 28 and the discharge port 45 of the air nozzle 43 is in close contact with the through hole 34. However, the present invention is not limited to this. The discharge port 45 of the air nozzle 43 may be disposed at a position close to the through hole 34. That is, it is sufficient if the discharge port 45 of the air nozzle 43 is disposed at a position protruding above the floor surface of the painting chamber 3 and capable of supplying the air A0 to the body internal space 38 through the through hole 34. . On the contrary, the flexible hose 41 is raised by the air cylinder 28 so that the discharge port 45 of the air nozzle 43 is inserted into the through hole 34 and the air A0 is discharged from the body internal space 38. Good. However, with this configuration,
Since it is necessary to increase the amount of rise of the flexible hose 41, it can be said that the configuration of the above embodiment is more practical.

  In each of the above embodiments, the flexible hoses 27 and 41 are used as the relay pipes. However, instead of this, a bellows-structured pipe, a sleeve-like extendable pipe, or the like may be used.

  In the above embodiment, in order to connect the discharge port 45 of the air nozzle 43 to the through hole 34, the air cylinder 28 is used to raise the tip of the flexible hose 41. However, the present invention is not limited to this. is not. Specifically, by using an actuator such as an air cylinder 28, the relay pipe that falls down and is in contact with the floor portion 7 is erected and is made perpendicular to the floor portion 7, so that the discharge port is formed in the through hole 34. You may comprise so that it may connect.

  In each of the above embodiments, the air pump 21 as a gas supply source is provided in the exhaust chamber 5, but the present invention is not limited to this. For example, a gas cylinder as a gas supply source may be fixed to the carriage 8, and gas may be blown from the discharge ports 25 to the through holes 34 through the branch pipes 23 fixed to the carriage 8. That is, the gas supply source may be fixed or movable.

  In each of the above-described embodiments, the painting booth 1 for painting the vehicle body 2 of the automobile is embodied. However, the painting booth for painting the vehicle body such as a bus or a train may be embodied.

  Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the respective embodiments described above are listed below.

  (1) The vehicle body painting method according to claim 1, wherein the gas is blown from the discharge port over the entire period from the start to the end of the painting.

  (2) The vehicle body painting booth according to claim 2, wherein the gas discharge member further blows the gas toward a wheel housing at a bottom portion of the vehicle body.

  (3) In Claim 3, the actuator operates before starting the painting to raise the tip of the relay pipe, and lowers the tip of the relay pipe after the painting is completed. A painting booth for vehicle bodies.

  (4) The vehicle body coating according to claim 4, wherein the actuator operates before starting the painting to raise the discharge port, and lowers the discharge port after the painting is finished. booth.

  (5) The vehicle body painting booth according to claim 3 or 4, wherein the actuator is an air cylinder that operates by being supplied with gas from the gas supply source.

The schematic sectional drawing which shows the painting booth of 1st Embodiment. The side view of the painting booth of 1st Embodiment. (A) is the state which lowered | hung the front-end | tip part of the flexible hose, (b) is explanatory drawing which shows the state which raised the front-end | tip part. Explanatory drawing which shows the through-hole and discharge outlet of the bottom part of a vehicle body. The side view of the painting booth of 2nd Embodiment. (A) is the state which lowered | hung the front-end | tip part of the flexible hose, (b) is explanatory drawing which shows the state which raised the front-end | tip part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Painting booth 2 ... Vehicle body 3 ... Painting chamber 8 ... Carriage 13 ... Coating machine 21 ... Air pump as a gas supply source 22 ... Air piping as piping 23 ... Branch pipe as gas discharge member 24 ... Inlet 25, 26 ... Discharge port 27 ... Flexible hose as relay pipe 28 ... Cylinder as actuator 34 ... Through hole 37 ... Window 38 ... Body internal space 41, 42 ... Flexible hose as relay pipe 43 ... Air nozzle 44 as gas discharge member 44 ... Inlet 45, 47 ... Discharge port A0 ... Air as gas A1 ... Air-conditioned air A2 ... Contaminated air R1 ... Paint zone

Claims (4)

In the paint zone in the paint room, paint was sprayed from the paint machine to paint the outer surface of the vehicle body, and air-conditioned air was allowed to flow down from the ceiling side of the paint room, including paint mist oversprayed from the paint machine In a vehicle body painting method in which polluted air is exhausted to the floor side of the painting room,
By supplying gas that does not contain paint to the interior space of the vehicle body via the bottom of the vehicle body, the exterior surface of the vehicle body is suppressed while preventing the paint from entering from the window portion of the vehicle body to the interior space of the vehicle body. A method of painting a vehicle body, characterized by performing painting. The painting room is equipped with a painting room with a painting machine for painting the outer surface of the vehicle body, and air conditioned air is allowed to flow down from the ceiling side of the painting room, and the paint mist oversprayed from the painting machine is included. In the vehicle body painting booth that exhausts contaminated air to the floor side of the painting room,
A gas supply source for pumping gas without paint,
Piping for leading the gas pumped from the gas supply source to the coating zone;
At least an inlet that is connected directly or indirectly to the pipe at the time of painting, a discharge port that can be disposed at a position protruding above the floor surface of the painting chamber, A vehicle booth for painting a vehicle, comprising: a gas discharge member that blows the gas toward a through hole provided in a bottom portion. The gas discharge member is a branch pipe that is fixed to a carriage for transporting the vehicle body to the paint zone, distributes the gas introduced from the introduction port, and discharges the gas from a plurality of discharge ports.
A proximal end portion of a flexible or stretchable relay pipe is connected to the pipe, and the distal end portion of the relay pipe is moved up and down using an actuator, whereby the distal end portion of the relay pipe is brought into contact with and separated from the introduction port. The vehicle body painting booth according to claim 2, wherein the vehicle body painting booth is configured to allow the vehicle body to paint.   In a state where the base end portion of the flexible or stretchable relay pipe is connected to the pipe, and the introduction port of the gas discharge member is connected to the distal end portion of the relay pipe, the discharge port is configured using an actuator. The vehicular body painting booth according to claim 2, wherein the discharge port is configured to be moved up and down so as to be brought into contact with and separated from the through hole.

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