JPH0345950Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a method for immersing the cap-shaped body in a treatment liquid in a treatment tank and pulling it up when surface treating a cap-shaped body such as a truck cab. This invention relates to an improvement of a cap-shaped body immersion device in liquid.

[Technical background of the invention and its problems]

After press-forming the truck cab and assembling it by welding,
In order to perform surface treatments such as cleaning, degreasing, chemical formation, or electrodeposition, it is necessary to repeatedly immerse the cab in the treatment solution of a treatment tank such as a washing tank or an electrodeposition tank (usually about 7 times). .

By the way, since the truck cab is a cap-shaped body, when it is hung from a hanger and immersed in the processing liquid, the air from the lower surface of the roof, which is the top of the cab, does not escape and remains there, giving buoyancy to the cab. There is a risk that the cab will float up and fall off the hanger, and the lower surface of the roof portion does not come into contact with the treatment liquid over a wide area, making surface treatment impossible. Therefore, it is necessary to remove the air accumulated under the roof of the cab immersed in the processing liquid by some means.

FIG. 6 shows a conventionally used cap-shaped body immersion device in liquid. One end of a snorkel 2, which is a tubular body curved in an approximately U-shape, is rotatably supported on a hanger 1 for hanging a truck cab A, which is a cap-shaped body. A float 3 is attached to the other end, and as the cab A is lowered into the liquid, the snorkel 2 rotates around the pivot point, and the other end enters the cab A and hits the bottom surface of the roof section a of the cab A. It was designed so that they were in contact with each other.

When the cab A is above the liquid level of the processing liquid, the snorkel 2 hangs down from the pivot shaft and is outside the cab A, but when the cab A is submerged in the liquid, the float 3 The snorkel 2 rotates clockwise around the axis due to the buoyancy of the snorkel 2, and the other end opening of the snorkel 2 collides with the lower surface of the roof part a and opens into the air pocket 4 on the lower surface of the roof a. The air is discharged into the atmosphere through the tube of the snorkel 2.

Therefore, the air from the lower surface of the roof part a can be discharged, and there is no need to operate the snorkel 2 in the liquid, resulting in good workability.

However, such a configuration has the following drawbacks. That is, the above hanger 1
For example, the robot moves in the direction of the white arrow in the figure and conveys the cabs A to the processing tank one after another.
A water flow is generated in the treatment liquid in the direction of the solid arrow, which is opposite to the direction of travel of the hanger 1, and has an effect on the cab A and the snorkel 2. Cab A is quite heavy, so the influence of the water flow is minimal, but the snorkel 2 itself is an extremely lightweight tube body and the float 3, which is a resistance element, is integrally provided. Strongly affected by water currents. Therefore, the snorkel 2 rotates in the direction of the water flow, and as shown by the two-dot chain line in the figure, the other end opening of the snorkel 2 often comes off from the air pocket 4, making it impossible to discharge the air in the air pocket 4. . At the same time, the cab A may come off the hanger 1 due to the buoyancy of the air.

If conveyance of the hanger 1 is stopped for a while while the cab A is immersed in the processing liquid, this problem will disappear, but it will take a considerable amount of time until the force of the water flow disappears, and productivity will decrease.

[Purpose of invention]

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to reliably exhaust the air accumulated under the top of the cap-shaped body while it is being transported using hangers, thereby allowing the processing process to proceed. It is an object of the present invention to provide a device for immersing a cap-shaped body in liquid without causing damage.

[Summary of the idea]

That is, in the present invention, a cap-shaped body such as a truck cab is suspended by a hanger and transported in a predetermined direction, and the cap-shaped body is immersed in a processing liquid in a processing tank and then pulled up. A snorkel curved in a substantially U-shape is rotatably supported at the end in the direction of travel, and one end of the snorkel enters the cap-shaped body and extends to the lower surface of the top of the cap-shaped body, and has an air vent hole. , the other end extends from the cap-shaped body in the traveling direction and projects upward from the level of the processing liquid, and the end extending from the cap-shaped body of the snorkel is magnetically attracted by a magnet, so that the snorkel A liquid drain hole is bored at the bottom of the curve of the snorkel, and this liquid drain hole is closed by a float valve body when the snorkel is in the treatment liquid, and is opened when the snorkel protrudes from the treatment liquid. This is a cap-shaped submersion device.

[Example of idea]

Hereinafter, one embodiment of the present invention will be described based on the drawings. Figure 1 shows the state in which the cap-shaped body A is pulled up from the processing tank by the cap-shaped body submersion device, and Figure 2 shows the state in which the cap-shaped body A is immersed in the processing liquid in the processing tank. The reference numeral 10 in the figure is a hanger conveyor, which is a transport mechanism, and is disposed above a plurality of processing tanks (not shown) that contain a plurality of types of processing liquids. Hangers 11 are suspended from the hanger conveyor 10 at predetermined intervals so that the hangers 11 can be conveyed in the direction shown by the white arrow in the figure. The hanger 11 is provided with a suspension mechanism 12 for removably suspending the cab A, and also has a snorkel 13, only the end of which in the transport direction will be described later. A magnet 14 is magnetically attracted to the lower surface of the roof portion a of the cab A.

Next, the snorkel 13 will be explained. It consists of a tube that is curved into a roughly U-shape.
A float valve body 15 is provided at the curved bottom portion 13a. A bracket 16 provided at the end of the hanger 11 in the transport direction rotatably supports a midway portion of one of the extending pipe portions 13b of the snorkel 13 via a pin 16a. The length of the open end of the extending pipe portion 13b is set such that it protrudes upward from the liquid level S of the processing liquid even when the cab A is immersed in the processing liquid. The other extending pipe portion 13c is inserted into the cab A through an opening such as a window fitting portion formed in the cab A, and extends to the lower surface of the roof portion a. Since the magnet 14 is magnetically attracted to the lower surface of the roof part a,
The open end of the extending pipe portion 13c is also magnetically attracted to the magnet 14 and closed. Incidentally, as shown in an enlarged view in FIG. 3, a plurality of air vent holes 17 are formed in the upper part of the extending pipe portion 13c.
The float valve body 15 is shown enlarged in FIGS. 4 and 5. FIG. 4 shows the state when the lowest curved part 13a of the snorkel 13 is in the treatment liquid, and FIG. 5 shows the state when the lowest curved part 13a is pulled up from the treatment liquid. this is,
A cylindrical valve box 18 with a bottom attached to the snorkel 13
A valve seat plate 19 that closes the upper opening of the valve box 18 and is directly fixed to the peripheral wall of the snorkel 13, and a rubber material that is fixed only to the two opposite side edges to the lower surface of the valve seat plate 19. It consists of a valve 20 made of a flexible material and a float 21 connected to this valve 20. A plurality of drain guide holes 22 are formed in the upper and bottom walls of the valve box 18, respectively. In the valve seat plate 19 and the curved bottom portion 13a of the snorkel 13, drain holes 23, 23 are respectively formed so as to communicate with each other.

Therefore, as shown in FIG. 1, even when the cab A is above the processing liquid, the end of the extending pipe portion 13c of the snorkel 13 remains magnetically attracted to the magnet 14. When suspending the cab A from the hanger 11 or removing it from the hanger 11, the snorkel 13 is forcibly separated from the magnet 14 and rotated about the pin 16a as shown by the chain double-dashed line in the figure. .

As shown in Fig. 2, when the cab A is immersed in the processing liquid, the air inside the roof part a has no place to escape.
An air pocket K is formed on this lower surface. The magnet 14 and the extending pipe portion 13c of the snorkel 13 are
It is located in this air pocket K. At the same time, the float 21 of the float valve body 15 generates buoyancy and floats up, forcibly pushing up the valve 20 and closing the drain holes 23, 23. However, since the extending tube portion 13c of the snorkel 13 remains magnetically attracted to the magnet 14, the air in the air pocket K is sucked in from the air vent hole 17, and passes through the inside of the snorkel 13 tube to the extending tube portion 13b. is discharged into the atmosphere from the open end of the Note that by the time the float 21 of the float valve body 15 generates buoyancy and floats up, the liquid drain guide hole 22...
Although the processing liquid enters the snorkel 13 tube through the liquid drain holes 23, 23, the amount of intrusion is only small because it is for a very short time, and there is no problem with air bleeding.

As the cab A is transported, a water flow is generated in the processing liquid in the direction shown by the solid arrow in FIG. 2, that is, in the opposite direction to the transport direction. However, since the snorkel 13 is located at the end of the cab A in the transport direction, and the extending pipe portion 13c in the direction in which the water flow is directed is magnetically attracted to the roof portion a, the snorkel 13 receives the water flow and strengthens the roof portion. a
Fixed. In other words, the snorkel 13 does not separate from the cab A, and the air can be reliably exhausted from the air pocket K.

When the cab A is pulled up from the processing liquid, the float 21 of the float valve body 15 loses its buoyancy.
It descends to the bottom of the valve body 18. At the same time, the valve 20 opens the drain holes 22 and 23, so the snorkel 1
The processing liquid that has entered the three pipes is discharged to the outside of the valve box 18.

In the above embodiment, the truck cab A
Although the device is immersed in the processing liquid, it goes without saying that the present invention is not limited to this, and can be widely applied as a cap-shaped device, that is, a device for immersing a device in which air accumulates on the lower surface of the top. .

[Effect of idea]

As explained above, according to the present invention, the air accumulated on the bottom surface of the top can be reliably removed while the cap-shaped body immersed in the processing liquid is being transported and without being affected by the water flow that occurs during transport. This has the effect that it can be discharged without damaging the cap-shaped body processing process.

[Brief explanation of drawings]

Figures 1 to 5 show an embodiment of the present invention, Figures 1 and 2 are schematic vertical cross-sectional views of a cap-shaped body immersion device in liquid in different states, and Figure 3 is a snorkel immersion device. FIGS. 4 and 5 are partially enlarged views, and FIGS. 4 and 5 are vertical cross-sectional views of the float valve body in different states. FIG. 6 is a schematic vertical cross-sectional view of a cap-shaped dipping device showing a conventional example of the present invention. . A... Cap-shaped body (truck cab), 11... Hanger, a... Top part (roof part), 13... Snorkel, 13a... Curved bottom, 13b, 13c...
...Extension pipe portion, 17...Air vent hole, 14...Magnet, 23...Liquid vent hole, 15...Float valve body.

Claims (1)

[Scope of utility model registration request] A hanger for suspending and transporting a cap-shaped body such as a truck cab in a predetermined direction, immersing the cap-shaped body in a processing liquid in a processing tank, and pulling it up; One end part enters into the cap-shaped body and extends to the lower surface of the top of the cap-shaped body, and has an air vent hole, and the other end extends from the cap-shaped body in the direction of travel and allows processing liquid to flow through the cap-shaped body. a snorkel curved in a substantially U-shape that protrudes upward from the liquid level; a magnet that magnetically attracts the end of the snorkel extending into the cap-shaped body; and a liquid perforated at the bottom of the curved part of the snorkel. Immersion of a cap-shaped body in liquid, characterized by comprising a drain hole and a float valve body that closes the drain hole by buoyancy when the snorkel is in the treatment liquid and opens it when the snorkel protrudes from the treatment liquid. Device.