JPH0693500A - Pre-treatment device for coating car body - Google Patents

Abstract

PURPOSE:To surely remove iron powders, etc., sticking to the floor surface of a car body when the car body is cleaned after chemical conversion-treated. CONSTITUTION:At an outlet part of a dipping bath 15 for cleaning the chemical conversion-treated car body B, a cleaning liquid is discharged toward the floor surface through a nozzle 23 when the car is kept inclined. The cleaning liquid flows together with the iron powders, etc., along the inclined floor surface and is discharged to the outside. Consequently, the iron powders, etc., are surely removed from the floor surface of the car body B passing through the dipping bath 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pretreatment device for an automobile body as an article to be coated, which has a degreasing step and a chemical conversion treatment step and is electrodeposited.

[0002]

2. Description of the Related Art An automobile body coating process usually has an undercoating process by electrodeposition coating, and an intermediate coating and a topcoating process mainly by electrostatic coating, respectively. Is carried out in advance in a pretreatment process before being carried into the coating process. This pre-treatment process removes oils adhering to the vehicle body and forms a chemically stable inorganic film on the steel plate surface, inactivates the steel plate surface and imparts rust prevention power, and at the same time Is a process for helping adhesion with
It has a degreasing process for removing oil adhering to the vehicle body and a chemical conversion treatment process for forming a chemical conversion treatment film on the article to be coated. The chemical conversion treatment step has a chemical conversion treatment tank containing a chemical conversion agent such as sodium phosphate and a dip tank for cleaning the vehicle body after passing through the chemical conversion treatment tank. This is due to the fact that the entire volume of Automotive Engineering Vol. 19
Pp. 193 to 198, published by Sankaido on April 20, 2014, item 8.2 "Coating process".

[0003]

In the dip tank in this chemical conversion treatment step, sludge may float on the surface, and sludge may remain on the floor surface of the vehicle body when passing through the dip tank. Although the car body has passed through the degreasing process before the chemical conversion treatment process, iron powder may remain on the floor surface of the car body before the chemical conversion treatment process. If a vehicle body in which sludge, iron powder, etc. remain on the floor is carried into the coating process, there is a problem that the coating quality will not be good. Therefore, the present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to enable to reliably remove sludge, iron powder and the like in the dip tank of the vehicle body after passing through the chemical conversion treatment tank. To do.

[0004]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a pretreatment device for painting an automobile body for performing a pretreatment such as oil removal on a vehicle body carried into a painting device. After the chemical conversion treatment, the dip tank containing the cleaning liquid for cleaning the vehicle body after cleaning with the cleaning liquid sprayed by the spray nozzle, and after the vehicle body is suspended and conveyed and the vehicle body is immersed in the dip tank Conveyance means for inclining the vehicle body at the outlet of the dip tank, and a jet flow are provided so as to directly hit the floor surface of the vehicle body in the inclined state at the outlet, and the liquid is supplied at a flow rate larger than that of the spray nozzle. A pretreatment device for coating an automobile body having a jet nozzle for jetting.

[0005]

The vehicle body is immersed in the dip tank, and is inclined upward at the outlet of this tank. Under this condition, the cleaning liquid is sprayed from the nozzle toward the floor surface of the vehicle body. The sprayed cleaning liquid flows downward along the inclined floor surface, and at the same time, iron powder and the like remaining on the floor surface are discharged to the outside. As a result, iron powder or the like does not remain on the vehicle body that has passed through the dip tank, and the coating quality in the subsequent coating process is improved.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing an embodiment of the pretreatment apparatus of the present invention. As shown in FIG. 1 and FIG. 2, the pretreatment apparatus of the present invention includes a chemical conversion treatment step 11 and a spray-type cleaning along a conveyor 10 that conveys a vehicle body B, which is an object to be coated, in a suspended state. Steps 12 and 13 and a dip-type washing step 14 are arranged, and the vehicle body B after the assembly is completed in the vehicle body assembly line is conveyed to each step by the conveyor 10 in this order and processed.
A degreasing process (not shown) is arranged on the upstream side of the chemical conversion treatment process 11.

The washing step 14 has a dip tank 15, and the vehicle body B after passing through the spray type washing steps 13 and 14 is tilted so that the tip of the vehicle body B faces downward. It is carried into the dip tank 15 and is carried out in a posture inclined in the opposite direction. FIG. 1 shows a state in which the vehicle body B is inclined at the outlet of the dip tank 15 with its tip end facing upward. In the cleaning process 14, a spray nozzle 21 is provided at the tip of a cleaning water supply pipe 20 having a pump P, and the cleaning liquid is sprayed from the spray nozzle 21 to the left and right side surfaces of the vehicle body B. Such nose spray slur 21 has been used conventionally, and for example, about 2 liters of cleaning liquid per minute is sprayed onto the side surface of the vehicle body. Further, in the present invention, as shown in FIG. 2 and FIG. 3, injection nozzles 23 are provided corresponding to the left and right sides of the vehicle body B. As shown in FIG. The cleaning liquid is spouted on the floor surface of the vehicle body B. As shown in FIG. 3, these injection nozzles 23 are adapted to be ejected from both sides of the vehicle body B to the floor surface of the vehicle body B through the openings of the portions to which the left and right doors of the vehicle body are attached. .

For example, FIGS. 4 and 5 are views showing a part of the floor surface of the vehicle body B, and iron powder adheres as indicated by a point A in FIG. Assuming that the vehicle body B is inclined at the outlet of the dip tank 15 in the present invention as shown in FIGS. 1 and 2, the injection nozzle 2 is directed directly toward the floor surface.
Iron powder and the like are reliably removed by the cleaning liquid sprayed from 3. The iron powder and the like are discharged outside together with the cleaning liquid flowing on the inclined floor surface. The liquid in the dip tank 15 is supplied to each of the injection nozzles 23 from a liquid circulation path 24 having a pump Pa. Further, as shown in FIG. 5, when it is used so that the jet flow from the injection nozzle 23 acts on a recessed portion (for example, a bead for floor reinforcement or a spare tire house) C formed on the floor surface of the vehicle body B, Iron powder, sludge, spatter, etc. are effectively removed. When one thick nozzle 23 is used, it becomes difficult to eject the jet stream aiming at this portion. According to the experiment, for one vehicle body B, about 2 nozzles from each of the two injection nozzles 23 and about 3 nozzles per minute
When a cleaning liquid with a flow rate of 00 liters was directly sprayed onto the floor surface, about 90% of the iron powder remaining on the floor surface was removed as compared with the conventional case where only 500 cc / min was used per bottle. It was

[0009]

As described above, according to the present invention, the vehicle body is tilted at the outlet of the dip tank for cleaning after passing through the chemical conversion treatment step. As a result of spraying the cleaning liquid, iron powder and the like remaining on the floor surface of the vehicle body will be reliably washed away. This has improved the coating quality in the subsequent coating process.

[Brief description of drawings]

FIG. 1 is a schematic view showing a pretreatment apparatus for coating according to an embodiment of the present invention,

FIG. 2 is a schematic side view showing a state in which the vehicle body has reached the outlet of the dip tank,

3 is a schematic front view of FIG. 2,

FIG. 4 is a plan view showing a state where iron powder remains on the floor surface of the vehicle body,

5 is a sectional view taken along line 5-5 in FIG.

[Explanation of symbols]

10 ... Conveyor (conveying means), 11 ... Chemical conversion treatment step, 1
4 ... Washing process, 15 ... Dip tank, 21 ... Spray nozzle, 23 ... Injection nozzle, B ... Car body.

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[Procedure amendment]

[Submission date] October 14, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

For example, FIGS. 4 and 5 are views showing a part of the floor surface of the vehicle body B, and iron powder adheres as indicated by a point A in FIG. Assuming that the vehicle body B is inclined at the outlet of the dip tank 15 in the present invention as shown in FIGS. 1 and 2, the injection nozzle 2 is directed directly toward the floor surface.
Iron powder and the like are reliably removed by the cleaning liquid sprayed from 3. The iron powder and the like are discharged outside together with the cleaning liquid flowing on the inclined floor surface. The liquid in the dip tank 15 is supplied to each of the injection nozzles 23 from a liquid circulation path 24 having a pump Pa. Further, as shown in FIG. 5, when it is used so that the jet flow from the injection nozzle 23 acts on a recessed portion (for example, a bead for floor reinforcement or a spare tire house) C formed on the floor surface of the vehicle body B, Iron powder, sludge, spatter, etc. are effectively removed. In the case of using a thick one nozzle 23, ease ejecting jets aimed at this part Kunar.

Claims (1)

[Claims] 1. A pretreatment apparatus for painting an automobile body, which performs pretreatment such as oil removal on a vehicle body carried into a painting apparatus, after washing with a washing liquid sprayed by a spray nozzle after chemical conversion treatment. A dip tank containing a cleaning liquid for cleaning the vehicle body, and a transportation means for suspending and transporting the vehicle body and dipping the vehicle body in the dip tank and then inclining the vehicle body at an outlet of the dip tank. A pretreatment device for painting an automobile body, comprising: a jet nozzle that is provided so that a jet flow directly impinges on a floor surface of the vehicle body that is inclined at the outlet portion, and jets a liquid at a flow rate larger than that of the spray nozzle. .