JPH04106364U - Surface treatment bath for automobile bodies - Google Patents

Abstract

(57) [Summary] [Purpose] Air, air,
Prevents gases such as hydrogen gas and oil from accumulating and causing defective degreasing, defective chemical formation, and defective electrodeposition in those areas. [Configuration] The tank bottom 7 of the surface treatment tank has a shallow shelf a where the car body 3 placed in the tank is completely immersed in the liquid in a horizontal state;
The car body 3 coming from the shelf area a is tilted back and forth while fully immersed in the liquid, and the deep area b is used to release the air accumulated in the roof part 11 before being stored in the tank of the surface treatment tank. The vehicle body 3 can be tilted without protruding from the liquid surface without increasing the capacity of the treatment liquid or the electrocoating liquid.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention uses a pre-treatment tank that pre-treats the surface of an automobile body for painting, and a pre-treated This invention relates to a surface treatment tank such as an electrodeposition tank that performs electrodeposition coating on the surface.

0002

[Conventional technology]

On an automobile production line, automobile bodies are suspended on conveyor hangers and continuously transported. While being transported, pre-painting treatment and electrodeposition coating are applied to the body surface. Pre-treatment for painting is carried out in the degreasing liquid and coating chemical liquid stored in the pre-treatment tank. The car body is immersed in the coating, and electrodeposition is also done by dipping the car body into an electrodeposition tank. This is done by immersing the car body in the liquid.

0003 At this time, the car body entering the pre-treatment tank or electrodeposition tank is on the back side of the roof. etc., and an air pocket is created on the back side of the The exposed parts may cause poor degreasing during pretreatment, poor chemical formation such as red rust, or There was a risk of insufficient film thickness during coating. In addition, in the pre-treatment tank, oil that is degreased from the surface of the car body and floats to the surface, Gases such as hydrogen gas generated by chemical reactions accumulate on the back side of the roof, causing degreasing. In some cases, defects and chemical formation defects were caused.

0004 For this reason, when the car body enters the electroplating bath, the coating is applied to the back side of the roof. There is a method for expelling air by spraying a jet of the preparation liquid, and a method for expelling air from a car bottle placed in a pre-treatment tank. Tilt the cylinder back and forth or left and right in the center of the tank to automatically drain the gas and oil that has accumulated on the roof. A method has been proposed (Japanese Unexamined Patent Publication No. 141883/1983) that uses the buoyancy of these objects to release them.

[0005]

[Problem that the idea aims to solve]

However, the former method is suitable for cases where the movement of the automobile body passing through the electrodeposition bath is not obstructed. It is very difficult to spray a jet of paint liquid precisely at the back side of the roof from a certain point. There was a problem in that it was difficult and the equipment cost increased significantly. On the other hand, with the latter method, a part of the car body tilted back and forth in the pre-treatment tank is used. Protrudes from the surface of the degreasing liquid and coating liquid stored in the tank to obtain uniform processing conditions. I can't. Also, if this method is used in an electrodeposition bath, a part of the car body will be exposed to the paint liquid. It is not possible to obtain uniform coating conditions because the parts protrude from the surface, and uneven coating occurs in those areas. There is a risk of In addition, if you increase the volume of the paint liquid stored in the electrodeposition tank and raise the liquid level, it will automatically Even if the vehicle body is tilted forward or backward, there is no risk of part of it protruding from the liquid surface, but In this case, the amount of paint liquid used increases significantly, resulting in higher paint costs and paint costs. A new problem arises in that the turnover speed (replacement speed) is also extremely slow. Ru.

[0006] Therefore, the present invention was designed to remove the paint liquid and pretreatment liquid stored in surface treatment tanks such as electrodeposition tanks and pretreatment tanks. An automobile body immersed in the liquid can be raised above the liquid level without increasing the volume of the treatment liquid. Tilt the body fully submerged to prevent it from coming out, and remove the gas that has accumulated on the roof of the body. The technical challenge is to ensure that they can escape.

[0007]

[Means to solve the problem]

In order to solve this problem, the present invention was designed to be suspended on a conveyor hanger and transported continuously. Automotive bodies that are surface treated by being immersed in liquid stored in a tank. In surface treatment tanks for There is a shelf where the car body that has entered the tank is completely immersed in the liquid in a horizontal state, and a shelf where it can be reached from the shelf. It consists of a deep field in which the coming car body is completely immersed in the liquid while tilting forward and backward. It is characterized by

[0008]

[Effect]

According to the present invention, the automobile body placed in the surface treatment tank is shaped at the bottom of the surface treatment tank. When moving from a dry shelf area to a deep area, a car bottle that was completely submerged in liquid in a horizontal state was discovered. Tilt the roof back and forth so that it does not protrude above the liquid surface, and remove the air that has accumulated on the roof. Body etc. can be reliably escaped.

[0009] In addition, the bottom of the surface treatment tank is completely submerged with the car body tilted back and forth. One part is a deep area, and the other part is a shelf area where the car body is completely immersed in a horizontal position. Therefore, the volume of pre-treatment liquid and electrodeposition liquid stored in the tank is very small. Ru.

0010

【Example】

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a sectional view showing an example of a surface treatment tank according to the present invention.

[0011] In the embodiment, it is suspended on a conveyor hanger 2 that has a current collector that slides on the charging rail 1. The car body 3, which is continuously transported, is immersed in a paint liquid stored in a tank and then electrified. The electrodeposition bath 4 for coating is shown, and the electrodeposition bath 4 has a body entry section 5 and a body exit section 6. The bottom 7 of the tank completely immerses the car body 3 in the tank in a horizontal state in the paint liquid. A shelf a where the vehicle is placed and a car body 3 coming from the shelf a are tilted forward and backward. It is formed by a deep area b where the area is completely immersed in the paint liquid.

0012 Deep area b includes a slope 8 that forms a step between it and shelf area a, and a body extending toward shelf area a. - A slope of the body tank outlet part 6 that extends further downward than the slope 9 of the tank entry part 5. 10, and the automobile body 3, which comes in a horizontal state from the shelf a, is immersed in the paint liquid. While fully immersed, gradually tilt forward along slope 8 and drop it down, and at the same time tilt forward. While changing the automobile body 3 that is now in the tilted state to a backward tilted state, the inclined surface 10 of the body tank outlet portion 6 is It has an inversion space that can be pulled up along the

[0013] Incidentally, the slope 9 of the body entry tank 5 is designed to resist the buoyancy force that the automobile body 3 receives when entering the tank. Therefore, in order to prevent the vehicle body 3 from falling from the conveyor hanger 2, It is formed on a gentle slope where the body enters the tank at an entry angle of about 15° to 20°. The slope 10 of the tank section 6 prevents the automobile body 3 from falling due to buoyancy. A steep slope is formed on which the automobile body 3 is taken out from the tank at an exit angle of about 25° to 30°. It is.

[0014] The above is the configuration of the electrodeposition bath 4, and the function and effect thereof will be explained next. First, a car body 3 suspended on a conveyor hanger 2 and transported is placed in an electrodeposition tank 4. From the body entry tank 5 along the slope 9, to the extent that it does not fall from the conveyor hanger 2. The tank starts entering the tank at a small entry angle, and becomes in a horizontal state parallel to the shelf area a on the tank bottom 7. Completely submerged in paint liquid. When entering the tank, the roof portion 11 of the car body 3 traps air and An air pocket 12 is formed over the entire back side of the flap 11, which inhibits the formation of an electrodeposited coating film. live.

[0015] Next, it is transported in a horizontal state along the shelf a of the tank bottom 7 while completely immersed in the paint liquid. The car body 3 leans forward along the slope 8 that falls from the shelf a to the deep area b, and The air accumulated on the back side of the roof section 11 is removed from the roof section when viewed from the conveyance direction of the automobile body 3. 11, and part or most of the air is lubed. The air bubbles escape from the roof portion 11. As a result, at least on the front end side of the roof portion 11, an air pocket is formed on the back side of the roof portion 11. 12 disappears and an electrodeposition coating film is formed.

[0016] Then, the car body 3, which was tilted forward, was completely immersed in the paint liquid in a deep place b. The body is reversed inside and tilted backwards, and the body extends long at a steep angle to deep area b of the tank bottom 7. The tank is pulled up along the slope 10 of the tank section 6 at a large exit angle. As a result, the air remaining on the back side of the roof part 11 becomes bubbles from the front end side. As a result, an electrodeposited coating film is formed over the entire back side of the roof portion 11.

[0017] Note that from the rear end side of the roof portion 11, the vehicle body 3 is tilted backwards and the tank is removed. The air pocket 12 is eliminated for the first time when the rear end of the car body 3 remains in the paint liquid for a relatively long time from when it is tilted backwards until it comes out of the tank. Since it is immersed, an electrodeposition coating film of sufficient thickness can be formed on the back side. In addition, since the front end side of the roof portion 11 is discharged from the tank earlier than the rear end side, the vehicle body When the air pocket 12 is completely eliminated when the air pocket 12 is tilted backwards, there is no water in the paint liquid. Although the immersion time is short, the front end side of the car body 3 is immersed in water from the shelf a to the deep water. When moving to b, the air pocket 12 is once eliminated by leaning forward, so electrodeposition coating is possible. There is no risk of insufficient film thickness.

[0018] Therefore, in order to prevent the automobile body 3 immersed in the paint liquid from protruding from the liquid surface, Air is supplied from the back side of the roof part 11 while maintaining uniform coating conditions. It is possible to eliminate the pocket 12 and form an electrodeposited coating film of the required thickness on the entire back side of the pocket 12. can.

[0019] Further, the bottom 7 of the electrodeposition bath 4 is deep only at the portion where the automobile body 3 is tilted back and forth. The car body 3, whose other parts are horizontal, can be completely immersed in the paint liquid. Since the shelf area is shallow, the volume of paint liquid stored in the tank is also very small. You don't have to worry about it.

[0020] In addition, in the above embodiment, an electrodeposition tank was explained, but the present invention is a pre-treatment tank for painting. It can also be applied to

[0021]

[Effect of the idea]

As described above, according to the present invention, it is possible to It is not necessary to significantly increase the volume of the stored paint liquid or pre-treatment liquid. Tilt the car body fully submerged so that it does not protrude above the liquid level, and It has the excellent effect of being able to reliably release gas, etc. that has accumulated in the roof section.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a surface treatment tank according to the present invention.

[Explanation of symbols]

2...Conveyor hanger 3...Automobile body 4...electrodeposition bath 5...Body entry section 6...Body outlet part 7... Tank bottom a... shelf b...Deep area

Claims (1)

[Scope of utility model registration request] 1. A surface treatment tank for an automobile body in which an automobile body (3) suspended from a conveyor hanger (2) and conveyed continuously is immersed in a liquid stored in the tank for surface treatment, comprising: An automobile body (3) in which the tank bottom (7) from the body tank entrance part (5) to the body tank exit part (6) is in the tank.
A shelf area (a) in which the car body (3) coming from the shelf area (a) is completely immersed in the liquid in a horizontal state, and a deep area (b) in which the car body (3) coming from the shelf area (a) is completely immersed in the liquid in a state tilted forward and backward. A surface treatment bath for automobile bodies, characterized by comprising: