JPH0417566Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an electrodeposition coating apparatus in which an object to be coated is placed on a hanger of a conveyor and immersed in an electrodeposition tank.

[Conventional technology]

In an automobile painting line, an automobile body to be coated is placed on a conveyor hanger and conveyed through a pretreatment process, an electrodeposition process, and a washing process in this order.

When performing electrodeposition painting by immersing the automobile body, which has been transferred to the electrodeposition process through the pretreatment process, in, for example, a cationic electrodeposition paint stored in the electrodeposition tank, the side walls in the electrodeposition tank are coated. A diaphragm electrode serving as a positive electrode is provided along the conveyor, and the car body placed on a hanger of the conveyor is connected to the negative electrode via the hanger to form an electrodeposited coating film on the surface of the car body. .

By the way, the shapes of hangers on which automobile bodies are placed and transported are known to be gate-shaped or C-shaped (see Figures 2 and 4 of Publication No. 62-9329), and which shape is adopted? However, a portion of the hanger is interposed above the automobile body, and a conveyor rail for suspending the hanger is also present.

For this reason, droplets of pre-treatment liquid or electrocoating paint adhering to the hanger may drip onto the top surface of the automobile body placed on the hanger, or lubricating oil or dirt adhering to the conveyor rail may fall and cause electrolysis. There was a risk that the paint film would be defective.

[Problem that the invention attempts to solve]

Therefore, the inventor of the present invention has devised a method for transporting the object to be coated by placing it on an L-shaped hanger, removing a part of the hanger and the conveyor rail from above the object, and removing the pre-treatment liquid and electrocoating liquid from the bottle. An attempt was made to prevent paint film defects from occurring due to falling parts, lubricating oil, dirt, etc.

In this case, the load of the object placed on the horizontal part of the L-shaped hanger, which consists of a vertical part and a horizontal part, acts in the opposite direction to the extension direction of the horizontal part, with the upper end of the vertical part serving as a fulcrum. Since this rotational force is applied, a structure is required to support the rotational force.

The structure must also be capable of supporting a moving L-shaped hanger.

Therefore, it was decided to attach a hanger support roller to the lower end of the L-shaped hanger, and to install a guide rail in the electrodeposition tank to which the support roller came into contact.

However, when a heavy automobile body is placed on an L-shaped hanger, there is a risk that the hanger support roller attached to the lower end of the hanger will be damaged. If the support roller is damaged, the L-shaped hanger will lose its support and become large. There is a risk that it will rotate in a tilted manner and collide with the side wall of the electrodeposition tank or the diaphragm electrode installed along the side wall, resulting in a serious destruction accident.

In order to prevent this, it may be possible to install a horizontal protective bar above the guide rail between the vertical part of the L-shaped hanger and the side wall of the electrodeposition tank, but in this case, the equipment cost will be increased. Not only does it increase,
The protective bar prevents the flow of current between the car body placed on the L-shaped hanger and the diaphragm electrode installed along the side wall of the electrodeposition tank, preventing the electrocoating paint from sticking to the surface of the car body. There is a risk that the rounding performance (throwing power) will decrease.

In view of the above, the present invention is designed to prevent rotation of the L-shaped hanger with the guide rail when the support roller of the L-shaped hanger that comes into contact with the guide rail in the electrodeposition bath is damaged. The purpose is to prevent accidents that destroy installed electrodes, etc.

[Means for solving problems]

In order to achieve this object, the present invention provides an electrocoating apparatus in which the object to be coated is placed on a hanger of a conveyor and immersed in an electrocoating tank, in which the hanger is formed into an L-shape consisting of a vertical part and a horizontal part. At the same time, a guide is provided in the electrodeposition bath to block the lower end of the vertical portion of the L-shaped hanger when the L-shaped hanger rotates in a direction opposite to the extending direction of the horizontal portion using the upper end of the vertical portion as a fulcrum. A rail is laid, and the L-shaped hanger is provided with a hanger support roller that abuts the guide rail.

[Effect]

According to the present invention, the hanger support roller of the L-shaped hanger that comes into contact with the guide rail installed in the electrodeposition tank is damaged, and the L-shaped hanger loses its support and moves horizontally using the upper end of the vertical part as a fulcrum. When the L-shaped hanger is tilted to rotate in a direction opposite to the extending direction of the L-shaped hanger, the lower end of the vertical portion is abutted against the guide rail to prevent further rotation of the L-shaped hanger.

This prevents an accident in which the L-shaped hanger collides with an electrode or the like installed in the electrodeposition bath. In addition, since the guide rail is designed to block the lower end of the vertical part of the L-shaped hanger, the object to be coated placed on the horizontal part of the L-shaped hanger and the electrode installed in the electrodeposition bath can be There is no risk of impeding the flow of current between the electrodeposition paint and reducing the throwing power of the electrodeposition paint.

〔Example〕

Hereinafter, embodiments of the present invention will be specifically described based on the drawings.

FIG. 1 is a front view showing an example of an electrodeposition coating apparatus according to the present invention, and FIG. 2 is an enlarged view of the main parts thereof.

In this example, the object to be coated is an automobile body W.
The hanger 2 of the conveyor C, which is loaded and immersed in the electrodeposition tank 1, has a vertical part 2a and a horizontal part 2b.
In such a manner that a part of the L-shaped hanger 2, the conveyor rail 3, etc. do not exist above the automobile body W placed on the horizontal portion 2b.
Electrodeposition paint adhering to the L-shaped hanger 2, lubricating oil adhering to the conveyor rail 3, dust, etc. are prevented from falling onto the upper surface of the automobile body W.

In addition, the left and right side walls 4R, 4 are inside the electrodeposition bath 1.
Diaphragm electrodes 5R and 5L are installed along the L, and the L-shaped hanger 2 suspended from the conveyor rail 3 rotates in a direction opposite to the extending direction of the horizontal portion 2b using the upper end side of the vertical portion 2a as a fulcrum. A guide rail 6 is provided to block the lower end of the vertical portion 2a when the vertical portion 2a is moved, and on the other hand, the L-shaped hanger 2 is provided with a hanger support roller 7 that comes into contact with the guide rail 6.

The guide rail 6 is fixed to the tips of supports 8, 8, . . . that project horizontally from below the diaphragm electrode 5L at regular intervals along the side wall 4L of the electrodeposition bath 1.

The guide rail 6 and each support 8 are made of metal whose surface is coated with an insulating coating, or of reinforced insulating plastic.

Further, a guide rail 6 fixed to the tips of the supports 8, 8, . It is laid at a height facing the vertical part 2a of the hanger 2 and the hanger support roller 7 provided on the vertical part 2a.

Note that the hanger support roller 7 is attached to a pair of upper and lower bearings 9, 9 that are formed to protrude from the lower end side of the vertical portion 2a.

When the hanger support roller 7, which supports the load of the automobile body W placed on the horizontal part 2b of the L-shaped hanger 2 and immersed in the electrocoating bath 1, is damaged, the L-shaped hanger is damaged as shown by the chain line in FIG. The lower end of the vertical portion 2a is tilted as shown in FIG.

Therefore, an accident in which the L-shaped hanger 2 collides with the side wall 4L of the electrodeposition tank 1, the diaphragm electrode 5L, etc. due to damage to the hanger support roller 7 is prevented.

Furthermore, since the guide rail 6 is laid at a position where it blocks the lower end of the vertical portion 2a of the L-shaped hanger 2, the distance between the automobile body W placed on the horizontal portion 2b of the L-shaped hanger 2 and the diaphragm electrode 4L is There is no risk of impeding the flow of current that occurs between the electrodes and reducing the coverage of the electrodeposition paint on the surface of the automobile body W.

Note that the hanger support roller 7 that comes into contact with the guide rail 6 is interposed between the vertical part 2a of the L-shaped hanger 2 and the guide rail 6, and is provided above the lower end of the vertical part 2a. By the way,
The mounting state is not limited to that shown in FIG.

[Effect of idea]

As described above, according to the present invention, since the hanger of the conveyor on which the object to be coated is placed and immersed in the electrodeposition tank is formed in an L shape, droplets of the electrodeposition paint liquid adhering to the hanger are This prevents droplets from falling onto the upper surface of the object to be coated taken out of the electrodeposition tank and causing a defective coating.

Additionally, in the electrodeposition tank, there is a guide rail that blocks the lower end of the vertical part of the L-shaped hanger when the L-shaped hanger rotates in the opposite direction to the extending direction of the horizontal part, using the upper end of the vertical part as a fulcrum. laid down, while L
Since the hanger is equipped with a hanger support roller that comes into contact with the guide rail, the L-shaped hanger with the object to be coated and immersed in the electrodeposition bath is supported by the guide rail via the hanger support roller. In addition to being able to move smoothly in the electrodeposition bath, even if the hanger support roller were to break and the L-shaped hanger was to tilt, the lower end of the vertical part of the L-shaped hanger would be directly supported by the guide rail. Since it moves in the electrodeposition tank in this state, it is prevented from colliding with the electrodes etc. installed in the electrodeposition tank and causing a breakage accident.

Furthermore, the guide rail laid inside the electrodeposition tank is
Since the lower end of the vertical part of the L-shaped hanger is designed to block the lower end of the vertical part, the current generated between the object to be coated placed on the horizontal part of the L-shaped hanger and the electrode installed in the electrodeposition bath. It has various excellent effects in that there is no risk of impeding the flow of the electrodeposition paint and reducing the throwing power of the electrodeposition paint.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of an electrodeposition coating apparatus according to the present invention, and FIG. 2 is an enlarged view of the main parts thereof. Explanation of symbols, W...Automobile body (subject to be coated),
C...conveyor, 1...electrodeposition tank, 2...L-shaped hanger, 2a...vertical part, 2b...horizontal part, 6...
Guide rail, 7...hanger support roller.

Claims (1)

[Scope of utility model registration request] In an electrodeposition coating apparatus in which the object to be coated is placed on a hanger of a conveyor and immersed in an electrodeposition tank, the hanger is formed into an L shape consisting of a vertical part and a horizontal part, and the A guide rail is installed on the L-shaped hanger to block the lower end of the vertical portion of the L-shaped hanger when the hanger rotates in a direction opposite to the extension direction of the horizontal portion using the upper end side of the vertical portion as a fulcrum. An electrodeposition coating device characterized by being provided with a hanger support roller that comes into contact with a guide rail.