JPH0343238Y2 - - 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 transported through the pretreatment process to the electrodeposition 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 L-shaped hanger, which consists of a vertical part and a horizontal part, is moved in the opposite direction to the extension direction of the horizontal part, with the upper end of the vertical part as a fulcrum, due to the load of the object placed on the horizontal part. Because of the applied rotational force, 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 performing two-stage energization control in cationic electrodeposition in which the electrode installed in the electrodeposition tank is used as the positive electrode and the coated object placed on the hanger is used as the negative electrode, the electrode installed in the electrodeposition tank and the L-shaped hanger are Since it is necessary to maintain insulation between the L-shaped hanger and the guide rail that supports the L-shaped hanger, the support that fixes the guide rail must be an insulator.

However, for example, when considering the strength of a guide rail that supports an L-shaped hanger on which a heavy object, such as an automobile body, is placed, it is necessary to use a metal rail with an insulating coating on the surface. It is not preferable for the support to be made of metal. This is because even if both the metal rail and the metal support are coated with insulation, when they are bolted together, the insulation between them is broken by the bolts, so the hanger support roller of the L-shaped hanger is This is because when the insulating coating applied to the surface of the metal rail comes off due to contact, a short circuit occurs between the L-shaped hanger and the electrodeposition tank via the support.

In addition, the length and shape of the supports vary depending on the width of the electrodeposition tank and the structure inside the tank, so if the entire support is made individually from insulating plastic, the molding cost will increase. , equipment costs will be extremely high.

In addition, since the guide rail is expected to be frequently attached and detached for inspection, if the support that fixes the guide rail is integrally molded with plastic, it will not be necessary to frequently attach and detach the bolts that fix the guide rail. There is a risk that the bolt may become loose due to cracking or immediate wear of the screw thread that engages the bolt.

[Means for solving problems]

The present invention was developed with the aim of solving the above-mentioned problems.In an electrocoating apparatus in which the object to be coated is placed on a hanger on a conveyor and immersed in an electrodeposition tank, the hanger is placed in a vertical portion. and a horizontal part, and a hanger support roller is provided on the lower end side, and a guide rail that supports the L-shaped hanger by bringing the hanger support roller into contact with it is provided protruding into the electrodeposition tank. The support consists of an insulating reinforced plastic column fixed to the electrodepositing tank and a metal column coated with an insulating coating fixed to the tip of the column. It is characterized by

[Effect]

According to the present invention, the L-shaped hanger carrying the object to be coated moves smoothly inside the electrocoating bath while being supported by the guide rail laid inside the electrocoating bath via the hanger support roller provided on the lower end side. pass through.

At this time, the support that fixes the guide rail has a structure in which a metal support is fixed to the tip of an insulating reinforced plastic support that is fixed to the electrodeposition tank, and the hanger support roller of the L-shaped hanger Even if the insulating coating on the surface of the guide rail that comes into contact with the plate comes off due to abrasion or impact, the reinforced plastic strut that forms part of the support between the L-shaped hanger and the electrodeposition tank will ensure that the area remains intact. Since it is maintained in a well-insulated state, it does not interfere with two-stage energization control.

In addition, since the tip of the support that fixes the guide rail is formed of a metal support, even if the guide rail is frequently attached and detached for inspection, the bolts that fasten the guide rail to the support will not loosen. There is no risk of it happening.

Furthermore, the support is standardized by unifying the length and shape of reinforced plastic struts, which are expensive to mold, and the length and shape of metal struts, which can be manufactured relatively easily and inexpensively, are adjusted to the width of the electrodeposition tank. By appropriately changing the design according to the structure inside the tank, it can be applied to any electrodeposition tank, so the equipment cost can be kept low.

〔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.
The part of the conveyor flail 3 of the L-shaped hanger 2 is formed above the automobile body W placed on the horizontal portion 2b so that the conveyor flail 3 and the like are not present.
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 a hanger support roller 6 provided on the lower end side of the vertical portion 2a of the L-shaped hanger 2 is brought into contact with the L-shaped hanger 2 so that the guide rail 7 It has been laid down.

This guide rail 7 is made of a metal rail whose surface is coated with an insulating coating, and is fixed with a bolt 9 to the tip of a support 8 that projects horizontally from a side wall 4L in the electrodeposition tank.

The support 8 also includes an insulating reinforced plastic column 8a that is directly fixed to the side wall 4L of the electrodeposition tank 1 with a bolt 10, and an insulating coating that is connected and fixed to the tip of the column 8a with a bolt 11. It is composed of a metal support column 8b.

Thus, the L-shaped hanger 2 carrying the automobile body W passes through the electrodeposition bath 1 while being supported by the guide rail 7 via the hanger support roller 6 provided at the lower end thereof.

At this time, the support 8 that fixes the guide rail 7 is formed of a support 8a integrally formed of insulating reinforced plastic and a metal support 8b coated with insulation, so that the hanger support roller 6 is Even if the insulating film coated on the surface of the guide rail 7 peels off due to impact or abrasion when they come into contact, the reinforced plastic support column 8a will still provide insulation between the L-shaped hanger 2 and the electrodeposition bath 1. maintained in condition.

Therefore, there is no fear that a short circuit will occur between the L-shaped hanger 2 and the electrodeposition tank 1, which will interfere with the two-stage energization control.

In addition, since the tip of the support 8 that fixes the guide rail 7 with the bolt 9 is formed of a metal support 8b, there is a risk that the bolt 9 will come loose even if the guide rail 7 is frequently attached and detached for inspection or the like. There is no.

Furthermore, the support 8 can be uniformly mass-produced with reinforced plastic struts 8a having the same size and shape, thereby saving manufacturing costs such as mold costs.
Metal support 8 that can be manufactured relatively easily and inexpensively
By processing b into a size and shape that corresponds to the width of the electrodeposition tank 1 and the structure inside the tank, it can be applied to any type of electrodeposition tank, so that the equipment cost does not increase.

For example, as shown in FIG.
When installing in a curved state, supports 8 of various lengths are required, but the reinforced plastic struts 8a can all be of the same length to save molding costs.

In addition, the reason why the guide rail 7 is curved is as follows.
L-shaped hanger 2 supported by the guide rail 7
automatically tilts the automobile body W placed on the horizontal part 2b of the L-shaped hanger 2,
This is to remove air that has entered the body and prevent defective electrodeposition due to adhesion of air bubbles.

Next, FIG. 4 is an enlarged view of main parts showing another embodiment of the present invention, in which the support 8 is a pair of reinforced plastic columns 8a fixed vertically to the side wall 4L of the electrodeposition tank 1, 8a and a metal support 8b supported by these two support supports 8a and 8a, and the strength of the support 8 as a whole is increased. As a result, the heavy automobile body W
Hanger support roller 6 of L-shaped hanger 2 carrying
Even if the guide rail 7 is in contact with the guide rail 7, it can be supported reliably.

Furthermore, as shown in FIG. 4, if an insulating plate 12 made of insulating plastic is attached along the surface of the guide rail 7 that the hanger support roller 6 comes into contact with, only the insulating plate 12 can be replaced periodically. There is an advantage that there is no need to replace the expensive guide rail 7 whose surface is coated with insulation.

[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.

In addition, a guide rail is installed in the electrocoating tank to support the L-shaped hanger by making contact with the hanger support roller provided at the lower end of the L-shaped hanger. The L-shaped hanger immersed in the tank can smoothly move within the electrodeposition tank.

In addition, part of the support that fixes the guide rail installed in the electrodeposition tank is formed of an insulating reinforced plastic column, and the L-shaped hanger is in contact with the guide rail via a hanger support roller. Since the reinforced plastic column maintains complete insulation from the electrodeposition bath, even if the insulating coating of the guide rail peels off, it will not interfere with the two-stage energization control.

In addition, since the tip of the support that fixes the guide rail is made of a metal post, the bolts that fasten the guide rail to the support will not loosen even if the guide rail is frequently attached and detached for inspection. There is no risk of this happening.

Furthermore, the support is standardized by unifying the length and shape of reinforced plastic struts, which are expensive to mold, and the length and shape of metal struts, which can be manufactured relatively easily and inexpensively, are adjusted to the width of the electrodeposition tank. By changing the design appropriately according to the structure inside the tank, it can be applied to any electrodeposition tank. It has various excellent effects such as low equipment costs.

[Brief explanation of the drawing]

Figure 1 is a front view showing an example of the electrodeposition coating device according to the present invention, Figure 2 is an enlarged view of its main parts, Figure 3 is a perspective view of a guide rail fixed to a support, and Figure 4 is the invention according to the present invention. FIG. 3 is an enlarged view of main parts showing another embodiment. 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 ... Hanger support roller, 7 ... Guide rail, 8 ...
Support, 8a...Insulating reinforced plastic support, 8b...Insulating coated metal support.

Claims (1)

[Scope of utility model registration request] In an electrocoating apparatus in which an object to be coated is placed on a hanger of a conveyor and immersed in an electrodeposition bath, the hanger is formed into an L shape consisting of a vertical part and a horizontal part,
A hanger support roller is provided on the lower end side, and a guide rail that supports the L-shaped hanger by bringing the hanger support roller into contact with it is fixedly laid at the tip of the support protruding into the electrodeposition bath. An electrodeposition coating apparatus, wherein the support is comprised of an insulating reinforced plastic column fixed to the electrodeposition tank and an insulating coated metal column fixed to the tip of the column.