JPH0414455Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a paint tank used for electrodeposition coating of automobile bodies and the like.

(Prior Art) Conventionally, in the electrocoating of automobile bodies, etc., the automobile body is generally immersed in a paint bath containing electrocoating paint (water-based paint, water-soluble resin, etc.), and then the paint is applied while being transported. This process involves applying a direct current or alternating current voltage between the tank or an electrode provided inside the tank and the car body, painting by electrophoresis, and then lifting the car body from the paint tank.

During this electrodeposition coating process, small parts temporarily or weakly attached to the car body sometimes fall off the car body due to the flow of the electrocoat paint and the vibrations of the conveyor that suspends and conveys the car body. In addition, there were cases in which the automobile body being transported collided with parts sinking to the bottom of the paint tank and was damaged. Most accidents involving small parts falling occurred when automobile bodies were immersed in electrocoating paint.

Conventionally, when an accident such as a falling small part occurs, the electrocoated paint in the paint tank is drained into a collection tank placed around the tank to temporarily empty the paint tank, and the fallen objects in the tank are removed. A common method was to remove the electrocoated paint and then return the electrocoated paint to the paint tank from the recovery tank.

(Problem that the invention aims to solve) However, with this method, it takes a very long time to remove the electrocoated paint from the outside of the tank and inject it into the tank, and maintenance and inspection of the paint tank takes a very long time. This has been a problem in trying to improve the efficiency of electrodeposition paint. On top of that,
In the above method, the collection tank is used many times,
It was also disadvantageous in terms of painting cost.

The purpose of this invention is to solve the above-mentioned problems and provide a paint tank for electrocoating that can easily remove fallen objects from the tank without having to remove or re-inject the paint in the tank. It's about doing.

(Means for Solving the Problems) The electrocoating paint tank according to the present invention has an electrocoating paint tank that is separate from a conveying means for suspending the object to be coated and transporting it into the electrocoating paint tank. Near the bottom of the tank, a plurality of mesh baskets or nets made of a material that is non-erodible to the electrodeposited paint are placed so as to substantially cover the bottom of the tank, and above the paint tank, a plurality of mesh baskets or nets made of a material that is non-erodible to the electrocoated paint are placed so that fallen objects can be taken out. The present invention is characterized in that it is provided with a lifting means for suspending each of the net baskets or nets and making it possible to pull them up above the paint tank.

The paint tank of the present invention, like conventional paint tanks, is equipped with a transport means for suspending the object to be painted (such as an automobile body) and transporting it into the electrodeposition paint tank, and separately from this, If a mesh basket or net is placed near the bottom of the tank in advance, and a foreign object falls, all you have to do is pull the mesh basket, etc. up to the top of the tank using the elevating means and take out the object caught in these, and the object will fall. It is possible to remove objects. The mesh basket etc. is then submerged in the electrodeposition paint again.

The mesh basket or mesh used in the present invention must be made of a non-erodible material that will not be eroded, dissolved, or decomposed by cationic electrocoating paint or anionic electrocoating paint, and will not cause a significant decrease in strength. Ru. For example, when filling a paint tank with cationic electrodeposition paint, the material for the mesh basket or net may be resin such as polypropylene or polyethylene, fiber reinforced resin (FRP), or resin or FRP coated on iron material, etc. In addition to the above-mentioned materials, metal materials such as iron and steel may also be used when an anionic electrodeposition paint is used. In addition, net baskets, etc. are usually made up of a collection of multiple net baskets, etc., each designed to cover a specific part of the bottom of the electrocoating paint tank, and are used to ensure the capture of fallen objects. , it is required to have a shape that can cover substantially all of the bottom surface of the paint tank used as a whole. Furthermore, the mesh size of the mesh basket etc. may be, for example, 5 meshes to 20 meshes.

In addition, the elevating means used in the present invention may be of any structure as long as it is equipped with a rope, a plastic chain, etc., and can be used to suspend and raise and lower the net basket or net, and may be a gear motor mechanism or a pulley. Mechanisms, etc. can be used. A preferred elevating means is one in which two parallel rails are installed above the paint tank in the longitudinal direction of the tank, and a predetermined number of chain blocks are attached to the rails so as to be movable along the rails. This is advantageous in that the net basket or the member (chain block) for pulling up the net can be stored in place when not in use.
Furthermore, if the lifting mechanism for electrodeposition coating electrodes, which has conventionally been installed above the paint tank, is used in combination as a lifting means, there is no need to provide new equipment, which is very preferable in terms of installation space and cost.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 indicates a paint tank used for cationic electrodeposition coating of automobile bodies, etc., and the tank is filled with a cationic electrodeposition paint 2. The paint tank 1 has an inner surface lined with vinyl chloride resin or fiberglass, and plate-shaped diaphragm electrodes 5 and ferrite electrodes 6, 6 are hung on both longitudinal walls. Figure 1). Note that 7, 7 indicates piping for circulating and supplying the polar liquid into the inside of the diaphragm electrode 5, and 8
indicates a safety shelf.

The paint tank 1 is provided with a transport means 9 such as a conveyor above it in the longitudinal direction of the tank, and therefore, first, the object to be painted 10, for example, an automobile body that has been subjected to chemical conversion treatment, water washing, etc., is transferred to the transport means 9. Hanging, tank 1
The front side of the diaphragm electrode 5 is immersed, and then, while being immersed as it is, it is conveyed in the longitudinal direction by the means 9 (in the direction of arrow P in Fig. 3), and at this time, a predetermined DC voltage is applied to the diaphragm electrode 5... By depositing the electrodeposition paint 2 on the object 10 between the objects 10 and then pulling the object 10 up from the rear side of the tank 1, an electrodeposited product is obtained. After that, baking treatment of electrodeposition coating, etc. is performed.

Furthermore, the paint tank 1 of the embodiment has a
FRP mesh basket 3... (mesh size 5 to 20 meshes) is appropriately sunk. The net basket 3 has ropes 11, 11a, and 11b connected to its four corners, respectively. Further, above the paint tank 1, two parallel rails 12, 12 are provided horizontally in the longitudinal direction of the tank 1, and on each rail 12, a chain block 4 as a lifting means moves along the rails. It can be installed freely.

Therefore, when electrocoating automobile bodies,
The ropes 11a and 11b of the net basket 3 are hung outside the paint tank 1, and the chain block 4...
... are gathered together at one end of the rail 12. When maintenance and inspection of the paint tank or when an accident occurs in which a small part or the like falls, each chain block 4 is first moved along the rail 12 in the direction of arrow A to just above each mesh basket 3, and then By lowering the chain of the block 4, hooking the ropes 11a and 11b on both the front and back sides of the net basket 3, respectively, and raising the chain of the block 4 to pull the net basket 3 above the paint tank 1, Fallen objects can be taken out while the electrodeposition paint 2 is kept in the paint tank 1.

(Effects of the invention) The electrocoating paint tank of the present invention has a non-erodible mesh basket or net suspended from the bottom of the tank to the top of the tank so that it can be raised and lowered, allowing the electrocoating paint in the tank to be removed from the tank. Fallen objects in the tank can be easily taken out without having to perform the long-time work of removing and returning them to the tank, which greatly reduces maintenance and inspection work time. In addition, the time required for interruption of electrodeposition coating work due to falling objects is reduced, and the productivity of coated products is significantly improved. Additionally, the need for recovery tanks is reduced;
In some cases, equipment such as large recovery tanks may become unnecessary, leading to a reduction in painting (equipment) costs.

[Brief explanation of drawings]

Fig. 1 shows a paint tank according to an embodiment of the present invention (see Fig. 1).
2 is a plan view showing the paint tank of the embodiment, and FIG. 3 is a schematic sectional view of the paint tank of the embodiment. In the figure, 1...paint tank, 2...electrodeposition paint, 3...
Net basket, 4...chain block.

Claims (1)

[Scope of utility model registration request] Separately from the transport means for suspending the object to be coated and conveying it into the electrocoating paint tank, a plurality of mesh baskets made of a material that is non-corrosive to the electrocoating paint are placed near the bottom of the electrocoating paint tank. Alternatively, a net is sunk so as to substantially cover the bottom surface of the tank, and a lifting means is provided above the paint tank for suspending and lifting the net basket or net, respectively, to the top of the paint tank when removing fallen objects. A paint tank for electrodeposition coating, which is characterized by the following: