JPH0346557B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a method for removing the processed material from the processing liquid tank when performing immersion treatment such as electrodeposition coating on the processed material having a downwardly opening depression. It relates to a device that introduces air into the hollow part when taking out the tank.

(Prior art) In a process in which the object to be coated is immersed in a processing liquid tank such as an electrodeposition liquid tank, when the immersed object is removed from the electrodeposition liquid tank, the roof of the automobile body is If the object to be treated has a shape that has a recess that opens downward, negative pressure may act on this portion, causing the object to be deformed. Conventionally, deformation has been prevented by supporting the parts that are likely to be deformed due to negative pressure when the tank is taken out by immersing them in the tank, and then removing the beams after the tank is taken out. However, this method has a problem in that it requires a complicated operation of locking several beams inside the object while aligning both ends of the beams.

In order to deal with this problem, Utility Model Application Publication No. 55-87359 provides two conduits arranged side by side, and one end of the conduit is arranged so as to float inside the processed material using a float. One conduit is provided with a valve, and the other conduit is simply opened, and the opening of the other conduit is positioned below the valve position of the one conduit, and the valve rises as the level of the processing liquid rises, allowing the material to be treated to An intake/exhaust device is disclosed that is configured to close when struck. With this device,
Trapped air generated in the material to be treated when entering the tank is discharged through a simply opened conduit, and when the space inside the material to be processed becomes negative pressure when leaving the tank, the above valve opens and air is introduced, thereby causing the material to be treated to deformation is prevented. However, with this structure, the float can move inside the object, so depending on the position of the float, the valve may come into contact with the inner surface of the object and be pressed by the buoyancy of the float.
Even if negative pressure is applied when draining the tank, the valve may not open and air may not be introduced.

(Object of the present invention) Therefore, the object of the present invention is to introduce air into the immersed material, which can prevent the action of negative pressure on the immersed material during removal from the tank and reliably prevent deformation of the material. The purpose is to provide equipment.

(Structure of the present invention) The structure of the present invention is an air introduction device for introducing air into a immersed material immersed in a processing tank with a recess opening downward. A substantially U-shaped air introduction tube is arranged facing upward and the other end is arranged to open above the liquid surface outside the object to be treated, and the air introduction tube is swingably attached to the object to be treated. A float is attached to the other end of the air introduction tube to float on the liquid surface outside the material to be treated and keep the opening above the liquid surface at all times, and a float is attached to the other end of the air introduction tube. On the side, the one end is moved in response to the swinging of the air introduction pipe due to the relative movement of the float, which corresponds to the relative lowering of the liquid level with respect to the material to be processed when the material to be processed exits the liquid tank. It is characterized by being equipped with an opening mechanism.

Effects and Effects of the Present Invention According to the present invention, as the immersed material is taken out from the processing tank, when the liquid level of the processing liquid is lowered to the outside of the material to be processed, the float,
That is, the other end of the air introduction tube connected to this moves downward. Since the air introduction tube is swingably attached to the processing object, one end of the air introduction tube disposed inside the processing object moves upward or downward as the other end moves downward. In the present invention, a mechanism is provided to open one end of the tube when the one end moves upward or downward, so when the float moves downward when taking out the processed material, one end opens and the air introduction tube opens. Air is introduced into the recessed part of the material to be treated. As a result, negative pressure is not applied to the processed material when it is discharged from the tank, and deformation of the processed material due to the negative pressure is prevented. The mechanism for opening this one end may be of a valve type, for example. In this case, the valve body is biased in the closing direction by a spring, and when the material to be treated is immersed, the valve, that is, one end of the air introduction pipe is closed.

In this structure, the air introduction pipe is attached to the processed material so that when the other end moves downward, one end moves upward, and when the tank is discharged, the one end moves upward, and the protrusion of the valve body at the tip of the pipe moves upward. When it hits the inside surface of an object, the valve is pushed open and air is introduced. Also,
The mechanism for opening one end may be a structure in which a suction cup is provided at one end, and in this case, the air introduction pipe is attached to the object to be treated so that when the other end moves downward, the one end also moves downward. During immersion, the suction cup is in close contact with the inner surface of the recessed part of the object to be treated, and one end is closed. When the liquid level drops when the tank is discharged, the air introduction pipe as a whole moves downward. At this time, the suction cup is separated from the inner surface of the object and one end is left open, allowing air to be introduced into the recessed portion. This air introduction device has a simple structure and can reliably prevent deformation of the processed material due to the negative pressure that is applied when the tank is taken out.

EXAMPLES Hereinafter, examples in which the present invention is applied to electrodeposition coating will be described with reference to the drawings.

FIG. 1 shows the front part of a longitudinal section of the object 12 immersed in the electrodeposition liquid 10. As shown in FIG.
In this example, the object to be processed 12 is a roof panel of an automobile body, and has a recessed portion 12a at the lower front. Below the roof panel 12, the panel 12
A U-shaped air introduction pipe 14 is arranged extending from the inside to the outside, and the inside side thereof extends upward inside the panel. There is a valve 18 at the inner tip.
The valve 18 includes a valve body 20, a valve body 22 having a protrusion 22a on the upper side, and a spring 24, and the valve body 22 is biased in the closing direction by the spring 24. It blocks the air vent provided in the valve box. The air introduction pipe 14 is connected to the panel 1
2, and a float 28 is attached in the middle via a bracket 26. The float 28 is floating above the electrodeposition liquid surface 10a, and its outer tip is held at a fixed position above the electrodeposition liquid surface 10a, with an opening at the tip open to the atmosphere. A holder 30 is attached to the center of the air introduction pipe 14, and the holder 30 is fixed to the roof panel 12 by clamping the front end of the roof panel 12. The holder 30 is provided with a hinge mechanism 32, and the air introduction pipe 14 can swing freely around a support shaft 34 of the hinge mechanism 32.

The roof panel 12 is immersed in the electrodeposition liquid 10 and the first
When it is completely submerged as shown in the figure, the liquid level 10a
is above roof panel 12, so panel 1
No negative pressure is acting on 2. In this state, the float 28 is in the upper position, and the outer side of the air introduction pipe 14 is held in an upwardly swung position by the buoyancy of the float. At this time, the inner side is in a downwardly swung position and is away from the roof panel 12. Therefore, the valve 18 is in a closed state due to the action of the spring 24, and the recessed portion 12a of the panel 12 is closed.
No air is introduced.

When the roof panel 12 is pulled up from the electrodeposition liquid 10 and removed from the tank, as shown in FIG. 2, when the roof panel 12 begins to rise above the liquid level 10a, negative pressure begins to act on the recessed portion 12a of the panel 12.
In this case, in this example, the float 28 moves downward as the liquid level 10a relatively decreases. As a result, the outside side of the air introduction pipe 14 swings downward,
In contrast, the inner side swings upwards. When the inner side swings upward and the protrusion 22a on which the valve body 22 of the valve 18 is provided hits the lower surface of the roof panel 12, the protrusion 22a is pushed by the panel 12, and the valve body 22 resists the biasing force of the spring 24. and move downward. As a result, the air flow port of the valve box 20 is opened, and air is introduced into the recessed portion 12a of the panel 12 through the air introduction pipe 14. Therefore, when the tank is taken out, no negative pressure is applied to the recessed portion 12a, and deformation of the roof panel 12 is prevented. The valve 18 is opened using the buoyancy of the float 28 in response to a drop in the liquid level, so the operation is reliable.

Another embodiment of the invention is shown in FIGS. 3 and 4.

FIG. 3 shows a part of the cross section of the roof panel 12 immersed in the electrodeposition liquid 10, and in this example, the air introduction pipe 14 swings in the lateral plane. It is attached to the roof panel 12 by a retainer 31.

The holder 31 includes a magnet 33 that attracts the lower surface of the roof panel 12 and an L-shaped bracket 35. One end of the L-shaped bracket 35 is fixed to the center of the air introduction pipe 14, and the other end is attached to a hinge. Mechanism 37
It is connected to the magnet 33 via a support shaft 39, and is able to swing freely around a support shaft 39. A flexible tube 41 is connected to the inner end of the air introduction pipe 14, and a flap-shaped suction cup 43 that expands upward is attached to the flexible tube 41. This suction cup 43 is attached to the roof panel 12
In the state shown in FIG. 3, in which the panel is immersed in the electrodeposition liquid 10 and completely submerged, it is adsorbed to the lower surface of the panel 12, blocking air.

When the float 28 moves downward during unloading, the air introduction tube 14 swings downward around the support shaft 39, and the suction cup 43 moves away from the bottom surface of the panel 12, opening the tip of the air introduction tube 14 and allowing air to flow out. Hollow part 12
introduced into a. Therefore, the same effect as the previous example can be obtained in this example as well.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of the roof panel immersed in the electrodeposition liquid and a diagram showing the installation state of the air introduction pipe according to one embodiment of the present invention, and FIG. FIG. 3 is a diagram similar to FIG. 1 of another embodiment, and FIG. 4 is a diagram similar to FIG. 2 of another embodiment. Explanation of symbols, 10...electrodeposition liquid, 12...roof panel, 14...air introduction pipe, 18...valve, 28
... Float, 30 ... Holder, 41 ... Flexible tube, 43 ... Suction cup.

Claims (1)

[Claims] 1. In an air introduction device for introducing air into a immersed object immersed in a processing tank with a depression opening downward, one end is placed inside the object to be treated and the other end is placed inside the object to be immersed. The air introduction pipe is provided with a substantially U-shaped air introduction pipe arranged so as to open above the external liquid level, and the air introduction pipe is swingably attached to the material to be treated. A float that floats on the liquid surface outside of the material to be treated and keeps the opening always above the liquid level is attached to the end side, and a float is attached to the one end side of the air introduction pipe to allow the material to exit the liquid tank. A mechanism is provided for opening the one end in response to the swinging of the air introduction pipe caused by the relative movement of the float corresponding to the liquid level lowering relative to the object to be treated. Air introduction device to immersed materials.