JPH0346556B2 - - 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 of the tank by means of beams, and then removing the beams after the tank is taken out. but,
This method has a problem in that it requires the complicated work of attaching several beams to the object with their ends aligned.

In order to deal with this problem, Japanese 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 material to be treated by a float. One conduit is provided with a valve, and the other conduit is simply opened, and the opening of the other conduit is located below the valve position of the one conduit, and the valve rises as the processing liquid level rises, allowing the material to be processed to flow. 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. In addition, since this valve is designed to open due to the pressure difference between the gas phase remaining in the hollow part of the processed material and the atmosphere, it is necessary for the gas phase to exist at the tip of the valve for operation. Not only is this not reliable, but it is also undesirable to leave a gaseous phase portion inside the treated material in order to operate the valve, as this may result in unpainted portions of the treated material.

(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 object immersed in a processing tank with a recess opening downward, between the inside and outside of the object. The air inlet tube is attached to the workpiece so that one end opens upward into the workpiece, and the other end is located above the surface of the electrodeposited liquid outside the workpiece. a swing arm that is movably attached to the object to be treated and extends between the inside and outside of the object; a float that is attached to the swing arm outside the object and floats on the surface of the electrodeposition liquid; When the electrodeposition liquid tank is taken out, the inner side end of the air introduction pipe is caused by the swinging of the swinging arm as the float moves as the electrodeposition liquid level lowers relative to the object to be processed. It is characterized by being provided with a mechanism for opening the section.

Effects and Effects of the Present Invention According to the present invention, one end of the air introduction tube attached to the object to be treated is opened to the inside of the object to be treated, and the other end, that is, the outside side of the object to be treated, protrudes above the surface of the liquid to be treated. , atmospheric or forced air is introduced. The swinging arm is attached to the object to be treated so that it can swing freely, and a float that floats on the surface of the processing liquid is attached to the arm portion that extends to the outside of the object to be processed. The swing arm swings as the relative position between the object and the liquid level changes. The swing arm opens an opening on the inside of the air introduction pipe in response to this swing. In other words, when the processed material is discharged from the tank, the float moves downward when the processing liquid level decreases relative to the processed material, and the swinging arm swings accordingly to open the opening of the air introduction pipe. Air is introduced into the hollow part of the processed material. As a result, negative pressure is not applied to the processed material when it is taken out of the tank, and deformation of the processed material due to the negative pressure is prevented. The mechanism for opening this one end may be, for example, a structure in which a check valve is provided at the inner tip of the air introduction pipe. In this case, the valve body is biased in the closing direction by a spring, and the material to be processed is immersed in the air. When the valve is open, one end of the air inlet tube is closed.

In this structure, the swinging fulcrum of the swinging arm is located at the inner end, and when the float moves downward during unloading, the entire arm moves downward and the lower surface of the arm hits the protrusion at the tip of the valve body. The valve is pushed open and air is introduced.

Further, as a structure for opening the inside of the air introduction tube, a sealing mechanism may be provided on the swing arm, and this sealing mechanism may close or open the opening at the inside end of the air introduction tube. In this case, the swinging fulcrum of the swinging arm is located at the center of the arm, and the inner part and the outer part move in contrast to this fulcrum. Therefore, when the object to be treated is immersed and completely immersed, the outer part to which the float is attached is in an upwardly swung position, while the inner part is in a downwardly swung position and the air introduction pipe is in a swung position. The opening at the inner end is closed by a sealing mechanism. When the tank is discharged, the liquid level is relatively lowered, so the outer part of the arm swings downward. On the other hand, the inner part swings upward and away from the opening of the air introduction tube, and the end is opened so that air can be introduced. The air introduction device of the present invention has a simple structure, and can reliably prevent deformation of the processed material due to the negative pressure that is applied when unloading the tank.

(Example) Hereinafter, an example in which the present invention is applied to electrodeposition coating will be described with reference to the drawings.

FIG. 1 shows a part of the cross section of the treated 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, there is a U-shaped air introduction pipe 1 extending from the inside of the panel 12 to the outside.
4 is arranged, and its inner side extends upward inside the panel. A valve 18 is attached to the inner tip, and the valve 18 includes a valve body 20, a valve body 22 having a protrusion 22a on the upper side, and a spring 24. The valve body 22 is closed by the spring 24. It is biased in the direction of the valve and blocks the air flow opening provided in the valve body. The air introduction pipe 14 extends above the liquid level 10a on the outside of the panel 12 and is open to the atmosphere. The air introduction pipe 14 is attached to the roof panel 12 in the following manner. That is, a magnet 26 is attached to the lower surface of the roof panel 12 by magnetic force, and a hinge mechanism 28 is attached to the magnet 26.
One end of the bracket 30 is swingably attached through the bracket 30, and the other end of the bracket 30 is connected to the air introduction pipe 1.
It is fixed near the inner bend of 4. A hand vise 3 is further installed in the center of the air introduction pipe 14.
The air introduction pipe 14 is fixed to the roof panel 12 by clamping the side end of the roof panel 12 with the other end of the hand vise.

The swinging arm 34 is attached to a magnet 26 that is attached inside the inner end of the air introduction pipe 14, and one end is swingably attached to another hinge mechanism 36 that is provided integrally with the hinge mechanism 28. It is being The swinging arm 34 is approximately U-shaped and extends from the inside of the roof panel 12 to the outside, and the electrodeposition liquid surface 10a is attached to the outside end via a bracket 38.
A float 40 floating above is attached.

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 40 is in the upper position, and therefore the swing arm 34 is in the upward swing position. At this time,
The protrusion 2 of the valve body 22 at the inner end of the air introduction pipe 14
2a is apart from the contact piece 34a on the lower surface of the arm 34, the valve 18 is in a closed state due to the action of the spring 24, and no air is introduced into the recessed portion 12a of the panel 12.

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 40 moves downward as the liquid level 10a relatively decreases. As a result, the swinging arm 34 swings downward around the support shaft 42, and the contact piece 34a provided on the lower surface of the swinging arm 34 comes into contact with the protrusion 22a of the valve body 22.
Push this down against the spring force. Therefore, the air flow opening 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 opening operation of the valve 18 is reliable because the buoyancy of the float 40 is used to swing the arm in response to the drop in the liquid level.

In FIG. 3, another embodiment of the invention is shown with the front part of the roof panel 12 in longitudinal section.

In this example, one end of a bracket 30 is fixedly attached to a magnet 26 attracted to the lower surface of the roof panel 12, and the center portion of the air introduction pipe 14 is fixed to the other end of the bracket 30.
Fixedly attached to panel 12. The swinging arm 34 is supported by the bracket 30 at the center so as to be swingable around a support shaft 44.
The inner side and the outer side of the support shaft 44 of No. 4 move in contrast. A seal member 46 is provided at the inner end of the swing arm 34 . During immersion when the panel 12 is fully submerged, the float 40, that is, the outer end of the swing arm 34 is in the upward swing position, so the inner side of the swing arm is in the lower position, and the seal member 46 is the air introduction pipe 14
The opening at the inner end is closed. When the roof panel 12 is removed from the tank, the liquid level 10 is lowered as shown in FIG.
Since a decreases, the outer side of the swing arm 34 swings downward, and the inner side swings upward. As a result, the sealing member 46 separates from the inner end of the air introduction pipe 14, and air is introduced into the recessed portion 12a of the roof panel 12 through the opening.

In the above example, since the opening operation of the air introduction pipe is performed by swinging the arm using the buoyancy of the float 40, the recessed portion of the roof panel 12
Air can be reliably introduced regardless of the magnitude of the negative pressure acting on 2a.

[Brief explanation of drawings]

Fig. 1 is a partial cross-section of the roof panel immersed in the electrodeposited liquid and the installation state of the air introduction pipe according to the embodiment of the present invention, and Fig. 2 is the same as Fig. 1 when the tank is taken out. A similar diagram, FIG. 3, 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, 26
... Magnet, 30 ... Bracket, 34 ... Swinging arm, 40 ... Float.

Claims (1)

[Claims] 1. An air introduction device for introducing air into a immersed object immersed in a processing tank with a depression opening downward, which extends between the inside and outside of the object and has one end inside the object. An air introduction pipe that opens upward and is attached to the object to be treated so that the other end is located above the liquid level outside the object; a swinging arm that extends over the object, a float that is attached to the swinging arm outside the object to be treated and floats on the liquid surface; and a mechanism for opening an end of the air introduction pipe inside the processed material by swinging a swinging arm in response to movement of a float in response to a decrease in air flow to the processed material. Introduction device.