JP2561538B2 - Pretreatment equipment for electrodeposition coating - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electrodeposition coating pretreatment apparatus used for pretreatment of electrodeposition coating of automobile bodies, that is, water washing, hot water washing, degreasing, chemical conversion treatment, and the like. .

(Prior Art) Conventionally, this type of pretreatment apparatus has a pipe and related equipment for cyclically supplying a liquid required for the pretreatment, such as cleaning water, hot water, degreasing water, and a phosphate solution. It is composed of a large pretreatment tank provided, and a moving mechanism for immersing, moving, and pulling up the automobile body, which is an object to be treated, in the pretreatment tank while supporting it with a hanger.

(Problems to be solved by the invention) Therefore, in the operation of such a pretreatment device, a small amount of fine metal powder, mainly iron fine powder, produced in cutting, polishing, etc. in a pre-treatment step, It is empirically known that, although it is carried in a quantity, it is carried together with an automobile body, and is mixed and accumulated in each tank for pretreatment as it is. The presence of such fine metal powders makes the effects of each pretreatment insufficient, adversely affects the electrodeposition coating in the next step, and eventually causes the quality deterioration of the final coated product (automobile). Therefore, all the mixed metal fine powder,
It was required to be removed, preferably during the pretreatment stage.

Generally, as a means for removing the fine metal powder in the tank, various methods such as a method using magnetic adsorption can be considered, but any method has a disadvantageous effect on the action of each pretreatment. Must not be In particular, the above-mentioned means should not be accompanied by another side effect that deteriorates the quality of the finished processed product in addition to the effect of removing the fine metal powder. Further, it should not be a removing device or the like that hinders the movement of the article to be processed (vehicle body). Needless to say, it is desirable that the newly provided means for removing the fine metal powder is economically advantageous.

The present invention has been made in consideration of the above circumstances, and its object is to be able to successfully remove the fine metal powder mixed in the tank outside the tank, and further to perform the pretreatment,
An object of the present invention is to provide a pretreatment device for electrodeposition coating, which has no disadvantages or adverse effects on the quality of treated products and the movement of treated products.

(Means for Solving the Problem) According to the present invention, when a large amount of fine bubbles is generated to fill the inside of the tank, the fine metal powder contained in the tank also floats up as the bubbles rise. It was completed focusing on the fact.

That is, the gist of the present invention is, in a pretreatment apparatus for electrodeposition coating, which is immersed in a pretreatment tank while supporting an object to be treated, moved, and pulled up, is arranged at the bottom of the treatment area of the pretreatment tank. The upper part of the pretreatment tank is provided with a fine foam generating means consisting of a foam generating pipe and a supply device of compressed air or pressurized water connected to the pipe, and two foam partition plates which respectively divide the inlet tank area, the processing area and the outlet tank area. In addition, the foam partition plate is provided with a gate that can be opened and closed at a portion through which the shaft of the moving hanger of the article to be processed passes, and the pretreatment device for electrodeposition coating is characterized in that.

The pretreatment device of the present invention is provided with a fine bubble generating means and a bubble partition plate in addition to the conventional basic configuration of the device.

The pretreatment tank is composed of an inlet tank area and an outlet tank area, and a processing area for performing the pretreatment, and further, the operation of this apparatus removes fine metal powder floating along with bubbles on the liquid surface,
Those provided with an overflow port for recovery are preferable.

The fine bubble generating means includes a bubble generating tube and a compressed air or pressurized water supply device. The bubble generating tube is preferably a tube provided with a large number of fine nozzles and is appropriately branched only at the bottom of the treatment area of the pretreatment tank, but is provided at the bottom of the inlet area or the outlet area. Absent. The compressed air supply device may be composed of, for example, an ordinary air compressor, and the pressurized water supply device may be a normally used one composed of a pressurized tank, a pump, an air supply source and its piping, and the like. And as such means,
Usually, those capable of generating fine bubbles having a diameter of about 5 mm or less, preferably about 0.1 to 2 mm are used.

Two foam partition plates are provided in the upper part of the pretreatment tank, one plate separating the input tank area and the processing area and the other plate separating the processing area and the discharge tank area. Each foam partition plate can be freely opened and closed in a portion through which the axis of the moving hanger of the article to be treated (automobile body) passes, for example, in the central part if it is a so-called C hanger, or in the tank wall side if it is an L hanger. It is equipped with a gate. The gate may be normally closed and opened when passing through the hanger shaft, and may be manual or automatic. Alternatively, for example, the partition plate may be formed by cutting out a passage portion of the hanger shaft and attaching two rubber plates on both sides of the cutout so as to partially overlap each other.

(Operation) In the present invention, by operating the fine bubble generating means, compressed air or pressurized water is supplied to the bubble generating tube at the bottom of the pretreatment tank, and a large amount of fine bubbles are blown into the tank to fill the inside of the tank. Therefore, the fine metal powder mixed in the tank together with the article to be treated is floated on the tank surface as the fine bubbles rise,
Floats on the surface and accumulates. Therefore, the suspended matter can be removed by overflow or the like.

The apparatus of the present invention is provided with the foam generating tube only at the bottom of the processing area, and is provided with two partition plates for partitioning the surface area of the processing area corresponding to the bottom from the inlet tank area and the outlet tank area. That is, the fine bubbles generated from the bubble generation tube are floated only on the surface of the processing area. Therefore, it is possible to avoid contact between the treated product and the floating bubbles containing metal in the entry area and the exit area, which may result in deterioration of the quality of the final product, such as leaving bubbles on the surface of the treated product. Don't get up

Further, since the device of the present invention is provided with the gate that can be opened and closed, it is possible to pass the moving hanger without hindrance, and thus it is possible to ensure the smooth continuous movement of the article to be processed.

(Example) Hereinafter, the Example of this invention is described with reference to drawings.

As shown in FIG. 1 and FIG. 2, the pretreatment apparatus of the embodiment comprises a pretreatment tank 1 for washing with water, washing with hot water, degreasing, chemical conversion, etc., and a car hanger (Fig. It is provided with a mechanism for carrying it in the direction of the arrow R while supporting it by not shown), immersing it in the entry area of the pretreatment tank 1, moving it to the treatment area, and pulling it up from the exit area. In the figure, 14 and 15 indicate the entrance and exit locations of the article to be treated.

The apparatus according to the embodiment has the fine bubble generating means 2 having the above-described conventional configuration.
Is added. The means 2 comprises a bubble generating tube 3 provided with a large number of small diameter nozzles, which is appropriately branched at the bottom of the treatment area, and which is connected to a pressurized water supply device 4 outside the tank. The device 4 has both the air and water supply pipes connected to the pressure tank 5
, Which is to prepare pressurized water there. In the figure,
6 indicates a pressure gauge, and 7 indicates a pump.

Further, in the present apparatus, a foam partition plate 8 is provided on the upper part of the pretreatment tank to separate the entrance tank area and the treatment area, and a foam partition plate 9 is provided to separate the treatment area and the exit tank area. Each of the partition plates 8 and 9 has a notch in the center thereof, and two rubber sheets are partially overlapped and attached to both ends of the notch to form gates 11 and 12 that can be freely opened and closed. Become.

Further, the pretreatment tank 1 is provided with an overflow portion 13 on the side of the treatment area so that the in-tank liquid can be overflowed and collected from an elongated port on the side wall of the upper portion of the tank. The recovered liquid is then supplied to a stirring riser (not shown) or the like separately provided in the tank, so that the treatment liquid is circulated and used. In the figure, l
Indicates the liquid level of the bath liquid.

Thus, when the apparatus is moved, by operating the means 2, pressurized water is supplied from the apparatus 4 to the bubble generation tube 3, and the fine bubbles 10 are blown out to fill the processing area. Then, as the bubbles rise, the fine metal powder mixed in the tank is also floated up and begins to float on the surface of the tank in the processing area, after which the floating material flows in the direction of arrow f, Recovered in 13. Therefore, the fine metal powder in the tank could be removed well, and no trace of fine bubbles was left on the surface of the article A to be treated.

(Effect of the invention) As described above, the electrodeposition coating pretreatment device of the present invention is
By providing a means for filling the fine bubbles in the treatment area of the pretreatment tank, the fine metal powder mixed in the pretreatment tank is floated on the surface of the tank as the bubbles rise and is floated by overflow or the like. Objects can be removed outside the bath.
In addition, the treated product can avoid contact with floating bubbles containing metal components in the entry and exit areas, and therefore no traces of bubble adhesion will remain on the surface of the treated product. Does not affect the quality of the product. Further, the action of the pretreatment itself is not affected at all. Further, the function of the partition plate with a gate allows a moving hanger or the like to pass through without any hindrance, thus ensuring a smooth continuous movement of the article to be processed.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an electrodeposition coating pretreatment apparatus of an embodiment of the present invention, and FIG. 2 is a plan view showing a pretreatment tank of the apparatus of FIG. In the figure, 1 ... Pretreatment tank 2 ... Fine bubble generation means 3 ... Bubble generation tube 4 ... Pressurized water supply device 5 ... Pressurized tank 8, 9 ... Foam partition plate 10 ... Fine bubbles 11, 12 …… Gate R …… Movement direction of the product to be treated f …… Flow direction of treated water l …… Water level of treated water

Claims (1)

(57) [Claims] 1. A bubble generating tube disposed at the bottom of a treatment area of a pretreatment tank in a pretreatment apparatus for electrodeposition coating, which immerses, moves, and pulls up a pretreatment tank while supporting an article to be treated. And a fine bubble generating means consisting of a compressed air or pressurized water supply device connected to the pipe, and provided in the upper part of the pretreatment tank, two foam partition plates for partitioning the inlet tank area, the processing area and the outlet tank area, respectively. In addition, the foam partition plate is provided with a gate that can be opened and closed in a portion through which the shaft of the moving hanger of the article to be processed passes, and a pretreatment device for electrodeposition coating.