JP5348633B2 - Air blow device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air blow device in which an air hose does not wind around a robot arm, so that it is prevented to cause defects of a coating surface due to the peeling off or falling of dust or lump stuck to the surface by rubbing the air hose with a robot arm. <P>SOLUTION: In the air blow device 1 used for preventing the secondary dropping of a coating material or washing water in the electrodeposition of an automobile body, an air blow nozzle 4 connected to the air hose 9 by a bracket 3 is attached to the distal end of the robot arm 2, and a rotary blade 5 having a nozzle head 6 is attached to the tip of the air blow nozzle. Since the air blow nozzle, to which the air hose is connected, does not rotate even when a rotary plate in the distal end part of the air blow nozzle is rotated, the air hose does not wind around the robot arm. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an air blow device for preventing secondary sagging of paint and washing water in electrodeposition coating of an automobile body, and in particular, an air blow device in which a rotating plate is rotatably attached to the tip of an air blow nozzle. About.

  In the electrodeposition coating of an automobile body, it is sent from the electrodeposition coating process as shown in FIG. 6 to a baking process through a water washing process, a saucer cutting process, and an air blowing process. That is, first, the automobile body 62 electrodeposited in the electrodeposition tank 61 in the electrodeposition coating process is sent to the water washing process and washed with the flush water 63. The washed water after washing is collected in the collection tank 64. Then, after being washed by the transfer lifter 65 through the washing water dripping step, the washing water is further removed in the air blow step.

  This is to remove the washing water adhering in the washing process after the electrodeposition coating in the sagging process, but for example, the washing water remaining in the gap between the steel plate matching parts of the door inner plate is the paint. This is because sagging occurs due to an increase in fluidity due to an increase in body temperature during baking, and a liquid pool-like electrodeposition surface defect, so-called secondary sagging, may occur at the lower end of the door. Therefore, before the automobile body is carried into the electrodeposition baking furnace, air blow by the robot 66 is performed to prevent secondary sagging of the washing water and take measures against poor coating surface. After the washing water is removed by air blow, the paint is baked by the electrodeposition baking furnace 67 as a baking process.

  Here, in the air blow process, as shown in FIG. 7, the air blow nozzle 72 attached to the tip of the robot 71 is inserted into the body chamber from the opening of the automobile body 73, and the pre-taught contents and air blow conditions are used. Air blow of the target part is implemented.

  It has been conventionally known that the washing water is removed by air blow in this way, and after the paint components are washed away by spraying pure water, the water adhering to the vehicle body is removed by the air blowing device. (For example, refer to Patent Document 1).

  Further, prevention of secondary dripping using air blow is not limited to removal of washing water, but is also carried out for prevention of secondary dripping of paint. That is, when the paint is baked in the electrodeposition baking process after the electrodeposition coating process, the paint often causes secondary sagging. Therefore, in order to prevent secondary sagging of the paint, the required number of air blow nozzles are arranged toward the part where the electrodeposition film sagging of the workpiece can occur, and cold air is blown onto the part to blow the electrodeposition film sagging. There is known a technique for removing them (see, for example, Patent Document 2).

  As described above, when air blow is performed in order to prevent secondary sagging in both washing water and paint, it is generally discharged from the air blow nozzle according to the part where the air blow is performed and the shape of the part. The air pattern is selected and used.

  For example, as shown in FIG. 8, the air blow nozzle used for air blow is a crushing nozzle 81 or a round pipe that has been processed so that the tip of the round pipe is flattened and the shape of the air discharged is flattened. A pipe nozzle 82 or the like that is used as it is and has an air discharge shape of a round pattern is used in combination.

  By the way, when air blow is used to prevent secondary sagging, an air blow nozzle is attached to the end of the robot arm with a bracket. However, air must be reliably blown to areas where washing water or paint sagging needs to be prevented. Positioning is performed by moving each axis of the robot so that the air can be discharged, and at the same time, the air blow nozzle is rotated to discharge air.

  FIG. 9 shows an operation state of an air blow nozzle at the tip of a robot arm conventionally used. Here, FIG. 9A is a diagram showing a state in which the air blow nozzle is attached to a certain position, and the two air blow nozzles 91a and 91b are attached to the tip of the robot arm 92 by a key-shaped bracket 93. Two air hoses 94a (solid line) and 94b (broken line) are connected to the air blow nozzles 91a and 91b, respectively. The air hoses 94a and 94b are fixed to the robot arm 92 by a plurality of fixing jigs 95 so as to be slidable in the longitudinal axis direction.

  Here, the air blow nozzles 91a and 91b may be rotated when the air blow nozzles 91a and 91b are directed to a portion where air is to be discharged. FIG. 9B is a view showing a state in which the air blow nozzles 91a and 91b are rotated by a certain angle as indicated by an arrow from the position of FIG. 9A. The air hose 94a is rotated along with the rotation of the air blow nozzles 91a and 91b. 94b slide along the robot arm 92 so as to wind around the tip of the robot arm 92.

  Thus, conventionally, air blow is performed to prevent secondary sagging of washing water and paint while rotating each axis of the robot arm and simultaneously rotating the air blow nozzle.

JP-A-8-187852 (paragraphs 0014 and 0015) JP-A-10-96098

  Regarding the above conventional technology, if the air blow nozzle and the air hose are directly connected, the positioning of the air hose becomes complicated when the air blow nozzle is directed to the target site, and the robot posture during air blow is determined. There was a problem that it took time to do this, and in some cases, the number of robots and the number of processes had to be increased.

  In addition, when the air blow nozzle needs to be rotated when the air blow nozzle is directed to the target part, the air hose is wound around the tip of the robot arm as shown in FIG. There was also a problem that the hose rubbed against the robot arm, and the rubbing and dust adhering to the air hose surface peeled off and dropped due to the rubbing, resulting in a defective painted surface.

  The present invention has been made to solve the above-mentioned difficulties, and the air hose does not wrap around the robot arm. Therefore, the dust and fluff that adheres to the surface of the air hose due to the air hose rubbing against the robot arm are peeled off. The present invention provides an air blowing device that does not drop and as a result does not cause defects in the painted surface.

In order to solve the above problems, a first aspect of an air blow device according to the present invention is an air blow device used for preventing secondary sagging of paint or flush water in electrodeposition coating of an automobile body, An air blow nozzle having an air hose connected by a bracket is attached to the tip of the robot arm, and a rotary plate having a nozzle head is rotatably attached to the tip of the air blow nozzle. The air blow nozzle is the fifth axis of the robot. The rotating plate is connected to the sixth axis of the robot, and is rotatable with the rotation of the sixth axis of the robot .

  A second aspect of the air blow device according to the present invention is characterized in that, in the first aspect, the nozzle head is provided with air discharge ports directed in a plurality of directions.

Furthermore, a third aspect of the air blow device according to the present invention is the first aspect, wherein the rotary plate is attached to the rotary plate, and the rotary shaft and the sixth axis of the robot are detachably connected via a coupling. It is characterized by.

  According to the present invention, the air blow nozzle to which the air hose is connected is fixed, and the air blow nozzle and the rotating plate are respectively attached to different axes of the robot. Even if the rotating plate is rotated so that air is discharged, the rotating plate will move independently of the air blow nozzle, so the air hose will not wrap around the robot arm. It is possible to provide an air blowing device in which the air hose rubs against the robot arm, and the scraped material such as dust and solids attached to the surface of the air hose falls due to the rubbing and the coating surface is not defective.

  Further, since the rotating plate is detachably attached, it is not necessary to make a large-scale modification of the entire air blowing device, and an air blowing device with extremely large cost merit can be provided.

  Hereinafter, preferred embodiments of an air blow device according to the present invention will be described with reference to the drawings.

  FIG. 1 is a view showing an air blow device of the present invention. In FIG. 1, an air blow device 1 of the present invention has an air blow nozzle 4 attached to a tip of a robot arm 2 by a bracket 3. A rotating plate 5 is attached to the tip of the air blow nozzle 4, and the rotating plate 5 can rotate about the axis in the longitudinal direction of the robot arm 2 as shown by an arrow. A nozzle head 6 is attached to the rotating plate 5.

  Here, the bracket 3 is attached to the fifth shaft 7 of the six-axis robot, and the air blow nozzle 4 is fixed by the bracket 3. On the other hand, the rotating plate 5 is rotatably attached to the sixth shaft 8 of the six-axis robot. An air hose 9 is attached by a fixing jig 10 along the robot arm 2.

  FIG. 2 is a diagram showing a six-axis robot, and FIG. 2A is an overall view thereof. As shown in FIG. 2A, the 6-axis robot can rotate from the first axis to the sixth axis as indicated by an arrow, and the direction is determined and positioned by a combination of these rotations.

  2 (b) and 2 (c) are enlarged views of the fifth and sixth axis portions of the robot tip. A bracket 3 is attached to the fifth axis 7, and the bracket 3 is used for air. The blow nozzle 4 is fixed. FIG. 2C shows a state in which the fifth axis is rotated from the state of FIG. 2B with the axis 7a (shown in FIG. 2A) indicated by a one-dot chain line as a rotation axis. The rotating plate 5 attached to the tip of the air blow nozzle 4 rotates about a shaft 8a indicated by a one-dot chain line shown in FIG.

  FIG. 3 is a diagram showing an example of the installation state of the air blow nozzle 4. In FIG. 3, the air blow nozzle 4 is attached and fixed by the bracket 3 attached to the fifth shaft 7 of the robot. A rotating plate 5 having a nozzle head 6 is attached to the tip of the air blow nozzle 4. An air hose 9 is connected to the air blow nozzle 4, and three air hoses 9a, 9b, 9c are connected as an example in FIG.

  FIG. 4 is a diagram showing details of the air blow nozzle 4. In FIG. 4, the air blow nozzle 4 is provided with air introduction pipes 11a, 11b, and 11c, and is connected to the air hoses 9a, 9b, and 9c shown in FIG. 3 at the air intake ports 12a, 12b, and 12c. It has become. A rotary plate 5 is attached to the tip of the air blow nozzle 4, and the rotary plate 5 is connected to a rotary shaft 14 via a sixth shaft 8 and a coupling 13 of the robot, and by rotation of the sixth shaft 8 of the robot. It can be rotated.

  The air blow nozzle 4 is fixed by the bracket 3 attached to the fifth shaft 7 of the robot, and the rotary plate 5 is connected to the rotary shaft 14 via the coupling 13 to the sixth shaft 8 of the robot. Since the air blow nozzle 4 and the rotation plate 5 are separated, the air blow nozzle 4 does not rotate even when the rotation plate 5 rotates, and therefore the air hoses 9a, 9b, 9c also do not rotate. Therefore, the phenomenon that the air blow nozzle rotates and the air hose wraps around the tip of the robot does not occur as in the prior art.

  Further, since the rotary plate 5 is connected to the rotary shaft 14 via the coupling 13 to the sixth shaft 8 of the robot, the rotary plate 5 can be easily replaced by removing the coupling 13. Therefore, for example, it is possible to prepare a plurality of rotating plates to which various nozzle heads are attached, and replace them efficiently and appropriately according to the target air discharge direction.

  FIG. 5 is a diagram showing details of the rotating plate 5. 5A is an exploded view, FIG. 5B is a front view, and FIG. 5C is a side view. In FIG. 5A, the rotating plate 5 is attached to the rotating shaft 14, and the rotating shaft 14 is connected to the sixth axis of the robot in a state separated from the air blow nozzle 4. Therefore, even if the rotary plate 5 rotates, the air blow nozzle 4 does not rotate.

  A nozzle head 6 is fixed to the rotating plate 5, and the nozzle head 6 rotates together with the rotating plate 5. As shown in FIGS. 5B and 5C, the nozzle head 6 has, for example, an air discharge port 6a in which the air discharge direction is oblique to the surface of the rotating plate 5, and a right angle to the surface (robot The air discharge port 6b that is parallel to the surface (downward in FIG. 5A) is provided.

  Note that the number and direction of the air discharge ports are not limited to the present embodiment, and a type of nozzle head suitable for the number, direction, pressure conditions, and the like is selected according to the portion where the air is to be discharged. Can do.

  As described above, the air blow device of the present invention does not rotate the air blow nozzle to which the air hose is connected even if the rotation plate at the tip rotates, so the air hose does not wrap around the robot arm, The air hose is rubbed against the robot arm, and dust and bumps adhering to the surface are peeled off. Therefore, since the robot can be taught without worrying about the air hose being rubbed, the operation efficiency of the robot is improved.

  In addition, since the rotating plate having the nozzle head can be easily replaced, it is not necessary to make a major modification of the entire air blowing device, and an air blowing device with extremely large cost merit can be provided.

  The air blowing device of the present invention is effective in preventing secondary sagging of the washing water after washing with the secondary sagging and rinsing water of the paint in electrodeposition coating, and by using an air blow for removing fines, for example. It can be widely applied to various methods that can be performed.

It is the figure which showed the air blow apparatus of this invention. It is a figure showing a 6-axis robot. It is a figure showing an example of the attachment condition of the air blow nozzle in the air blow apparatus of this invention. It is a figure showing the detail of the air blow nozzle in the air blow apparatus of this invention. It is a figure showing the detail of the rotating plate attached to the air blow nozzle in the air blow apparatus of this invention. It is a figure explaining the electrodeposition coating process of a motor vehicle body. It is a figure explaining the method of an air blow. It is a figure which shows the example of the conventional air blow nozzle. It is a figure showing the operating condition of the conventional air blow nozzle.

1 ... Air blow device 2 ... Robot arm 3 ... ... Bracket 4 ... Air blow nozzle 5 ... Rotating plate 6 ... ..... Nozzle heads 6a, 6b, 6c ..... Air discharge port 7 ..... 5th axis of robot 8 ... ············ 6th axis 9 of robot ·················· Air hose 10 Fixing jigs 11a, 11b, 11c... Air introduction pipes 12a, 12b, 12c... Air intake 13...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Rolling shaft

Claims (3)

An air blow device used to prevent secondary sagging of paint or flush water in the electrodeposition coating of automobile bodies, with an air blow nozzle attached with an air hose by a bracket at the tip of the robot arm. A rotary plate having a nozzle head is rotatably attached to a tip of the air blow nozzle, the air blow nozzle is fixed to the fifth axis of the robot by the bracket, and the rotary plate An air blower characterized in that it is connected to six axes and is rotatable with the rotation of the sixth axis of the robot .   The air blowing device according to claim 1, wherein the nozzle head is provided with air discharge ports directed in a plurality of directions. The rotating plate rotating shaft is attached to the rotary shaft and the air blowing apparatus according to claim 1 wherein the sixth axis, characterized in that it is detachably connected via a coupling of the robot.

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