JPS6119838Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an aeration pipe device in which an aeration pipe for supplying air into an aeration tank is installed vertically, and is lifted outside the aeration tank for cleaning or other purposes. To provide an aeration pipe device which is simple and can be suitably used even in a relatively deep aeration tank. Conventionally, as this type of air diffuser device, an air pipe connected to the air diffuser pipe is divided into a plurality of pipes, and the air pipes are connected at a rotary joint part, and a cable is connected to the air diffuser pipe.
There is a cable that can be hoisted up in a folded state by pulling up the cable, but since this cable has a structure in which multiple air pipes are connected using multiple joint members, it becomes a heavy air pipe. As a result, a large power source is required for lifting, resulting in a large device, which is even more disadvantageous when the aeration tank is deep. In addition, when the air pipes are lifted, the air pipes are arranged in a staggered manner, alternating left and right, which takes up a large amount of space above the aeration tank, and as a result, workers are scattered above the aeration tank. When performing maintenance and inspection of air equipment, this work has the drawback of being extremely difficult to perform and resulting in poor workability. In addition, when lifting the air diffuser pipe with the cable as mentioned above, the lateral weight balance is not maintained, and the wire becomes slanted, causing both the air diffuser pipe and the air supply pipe to be lifted at an angle. It has the disadvantage of poor stability during frying.

Furthermore, in the past, the lower air pipe was constructed by rotatably connecting the lower air pipe to the upper air pipe, which was rotatably supported in the aeration tank, and the upper air pipe was lifted using a lifter while the lower air pipe was lifted at the same time. There is a known device that can be lifted with the lower air pipe bent in relation to the upper air pipe, but the lengths of the upper and lower air pipes are different. Because the length is maintained as it is, it cannot be lifted in a compact form,
Especially when used in a deep aeration tank, these air pipes are long and therefore unsuitable. Also, if a long air pipe is used, unless the length of the lower air pipe is shortened, even if the upper air pipe is lifted up, the diffuser pipe will not be able to be pulled up to the top of the aeration tank, and will be suspended in the middle. As a result, it becomes impossible to maintain and inspect the air diffuser pipe. However, if the length of the lower air supply pipe is shortened in this way, it is necessary to prepare a long upper air supply pipe, which has the disadvantage that the above-mentioned lifter requires a large amount of power.

In FIGS. 1 and 2, a base pipe 3 is fixedly disposed on a base 2 at the upper edge of the aeration tank 1 along the edge direction of the aeration tank 1, and a rotatable joint is connected to the base pipe 3. 4, the horizontally bent ends of the first air pipe 5 are connected. This first air supply pipe 5 is bent downward at the other end to form a vertical bent part 5a, and inserted into the aeration tank 1, and further bent horizontally in the direction of the edge, and a rotatable joint 6 is attached to the bent opening end. The upper end horizontal portion of the second air pipe 7 is connected via the upper end horizontal portion of the second air pipe 7. This second air supply pipe 7 is also bent downward, and a third air supply pipe is connected to its lower end with a diffuser pipe 10 having a plurality of aeration cylinders 10a provided with a large number of small holes through a sealing device 8 at its lower end. 9
be installed vertically.

As shown in detail in FIG. 3, the base end side of the third air pipe 9 is made air-liquid-tight and sealed by a seal packing 11 of a sealing device 8 attached to the lower end of the second air pipe 7. 2 is installed inside the air pipe 7 so as to be slidable in the axial direction. A stopper 12 is fixed to the outer periphery of the upper end of the third air pipe 9 and comes into contact with the inner end surface of the sealing device 8 to restrict downward sliding of the third air pipe 9 with respect to the second air pipe 7. Reference numeral 13 designates another stopper fixed to the lower outer periphery of the third air pipe 9, which comes into contact with the lower end surface of the sealing device 8 to restrict the amount of upward sliding of the third air pipe 9 relative to the second air pipe. Further, in order to protect the sliding part between the third air pipe 9 and the second air pipe 7 from dirt and the like, the entire sliding part is covered with a retractable cover 14 made of resin cloth or the like. This cylindrical cover 14 has a bellows shape,
The upper end opening is fitted and fixed to the outer circumference of the lower end of the second air supply pipe 7, and the lower end opening is fitted and fixed to the outer circumference of the lower end of the third air supply pipe 9, and expands and contracts as the third air supply pipe 9 slides. Furthermore, a leg piece 15 is provided on the lower surface of the aeration pipe 10 to hold the third air supply pipe 9 on the inner bottom surface of the aeration tank 1.

On the other hand, a downward protruding rod 16 is provided protruding from the horizontal bent portion at the lower end of the first air pipe 5, and a protruding rod 17 is further provided protruding horizontally near the upper end of the vertical portion of the second air pipe 7,
The first air pipe 5 and the second air pipe 7 are connected to a rotatable joint 6
When the protruding rod 17 is connected perpendicularly to the bottom of the aeration tank 1 in a straight line through the aeration tank 1, the protruding rod 17
6 to prevent the second air pipe 7 from swinging counterclockwise in FIG.

Further, on the lower surface of the base end side of the first air pipe 5, there is a projecting plate 1 having a pin through hole 18a, as shown in detail in FIG.
8 is provided in a protruding manner, and this projecting plate 18 is engaged with a projecting plate 19 having a pin through hole 19a which is provided in an upwardly projecting manner from the base 2.
By inserting a pin 20 through 19a, rotation of the first air pipe 5 with respect to the base pipe 3 is prevented.

Next, a hook 23 is fixedly provided at the lower end of the third air pipe 9, and a fixture 25 is attached to the hook 23 from the lifting drive device 21 to the vertically bent portion 5a of the first air pipe 5. The lower end of the cable 22, which extends downward by passing around the guide roller 24 attached thereto, is connected. Furthermore, a locking tool 26 is fixed at a suitable position between the hook 23 of the cable 22 and the guide roller 24, and the lifting drive device 21
By winding up the cable 22, the proximal end of the third air pipe 9 is placed in a position where the locking tool 26 and the fixture 25 are engaged when the third air pipe 9 is housed in the second air pipe 7, and both metal fittings are engaged with each other. By inserting pins 27 into pin holes 25a and 26a drilled in pin holes 25 and 26, respectively, the cable 22 is substantially fixed with the fixture 25.

In addition, the fixture 25 is provided with a limit switch 28 for stopping the first stage of lifting that senses the contact of the locking tool 26, and the base 2 is provided with a limit switch 28 for stopping the first stage of lifting that senses the contact of the first air pipe 5. A limit switch 29 for stepwise stopping is provided. Numeral 30 is a hook-shaped locking tool fixed to the side surface of the base 2, and is adapted to hook the locking portion 22a at one end of the cable 22.

The operation of this device with the above configuration is as follows.

When lifting the air diffuser, first remove the locking part 22a of the cable 22 from the locking tool 30 of the base 2,
The locking portion 22a is connected to the lifting drive device 21. And the first air pipe 5 and the projecting plates 18, 1 of the base 2
A pin 20 is inserted into the cable 9, and the lifting drive device 21 is driven to wind up the cable 22 while the first air pipe 5 is fixed to the base 2. In this case, the protrusion 17 of the second air pipe 7 is the same as the protrusion 16 of the first air pipe 6.
The cable 2 is held vertically by hitting the
Only the third air pipe 9 connected to the lower end of the pipe 2 with a hook 23 is lifted up. Therefore, the base end of the third air pipe 9 slides on the sealing device 8, and the second air pipe 7
stored inside. After this, when the locking device 26 fixed to the cable 22 engages with the fixing device 25 fixed to the first air pipe 5 and comes into contact with the limit switch 28 for stopping the first stage of lifting, the limit switch 28 is activated. The driving of the lifting power device 21 is temporarily stopped.

Next, the metal fittings 2 of the first air pipe 5 and the cable 22 are
5 and 26 to fixedly connect the cable 22 to the fixture 25 of the first air pipe 5, and connect the first air pipe 5 and the projecting plates 18, 19 of the base 2.
After that, the pin 20 inserted in the pin 20 is pulled out, and the lifting drive device 21 is then driven again. Then, the first
The air supply pipe 5 is rotated counterclockwise in FIG. 1 about the axis of the base pipe 3 via the rotatable joint 4 with the base pipe 3, and is lifted out of the aeration tank 1.
At this time, the cable 22 is attached to the hook 2 of the third air pipe 9.
3 and the fixture 25 of the first air pipe 5, the second air pipe 7 is moved as the first air pipe 5 rotates while the third air pipe 9 is housed. It hangs down from the rotary universal joint 6 due to its own weight, and is placed above the aeration tank 1 while causing relative rotation in the clockwise direction in FIG. It will be salvaged. After this, the first air pipe 5 is lifted and the limit switch 2 for stopping the second stage is activated.
9, the limit switch 29 is actuated to stop the lifting drive 21 and complete the entire operation. At this time, air pipes 5, 7, 9
The diffuser pipe 10 and the like are in the state shown by the two-dot chain line in FIG.

In this way, the aeration pipe 10a and the like can be taken out of the aeration tank 1 and inspection, repair, replacement, etc. can be performed on the upper edge of the aeration tank 1.

In addition, when suspending the air diffuser device, the drive device 2
1 is reversed to relax the cable 22, the first air pipe 5 is moved to the rotatable joint 4 due to the load at its tip.
At the same time, the second air pipe 7 is suspended from the rotary joint 6 with the first air pipe 5 into the aeration tank 1, and the second air pipe 7 is suspended from the rotary joint 6 with the first air pipe 5. When the trachea 5 is rotated to the position where the projecting plate 18 of the air pipe 5 and the projecting plate 19 of the base 2 engage, the projecting rods 16 and 17 of the first air pipe 5 and the second air pipe 7 are mutually engaged. abutting and those air pipes 5
Relative rotation in the clockwise and counterclockwise directions is stopped in FIG. It becomes a state. In this state, pins 20 are inserted into the pin holes 18a and 19a of the projecting plate 18 of the first air pipe 5 and the projecting plate 19 of the base 2, respectively.
is inserted, and the first air pipe 5 is fixedly supported on the base 2. After this, the first air pipe 5 and the metal fittings 2 of the cable 22 are
5, 26 are removed, and the drive device 21 is reversed to loosen the cable 22, the third air pipe 9 slides on the sealing device 8 by its own weight and closes the air diffuser pipe 10. lowers until the leg piece 15 touches the bottom of the aeration tank 1. When this leg piece 15 comes into contact with the bottom of the aeration tank 1, the cables 22 are completely let out from the drive device 21, so the drive device 21 is stopped and the cables 22 are pulled out from the drive device 21. Remove the locking part 22a that is the end, and attach the base 2.
The cable 22 is fixed to the locking tool 30 of the aeration tank 1.
Hold it so it doesn't fall inside. Then, the drive device 21 is moved, and other aeration pipe devices installed in large numbers in the aeration tank 1 are lifted up in the same manner, and necessary inspections, repairs, etc. are performed.

The present invention has a configuration in which the third air pipe is telescopically connected to the second air pipe as described above.
Even if the aeration tank is deep, the third air supply pipe can be easily expanded to accommodate it, and unlike conventional systems, it does not require many joint members to connect the divided air supply pipes, resulting in a smaller weight. , the lifting drive device does not require a large power source, and the overall size of the device can be prevented.

In addition, when lifting or lowering the air diffuser device into or out of the aeration tank, the third air pipe is stored inside the second air pipe, and these air pipes function as if they were one air pipe.
This is because the second air pipe remains in this stowed state, and as the first air pipe rotates, it hangs down due to its own weight and is lifted or suspended. , there is no fear that the lateral weight balance is not maintained as in the past, and lifting or hanging can be carried out in a stable state, and the length of the third air pipe is long enough to accommodate the third air pipe within the second air pipe. Therefore, the first air pipe can be made shorter, and the rotation locus of the tip of the first air pipe becomes a circle with a small radius.For example, even if the width of the aeration tank top opening is narrow, there will be no interference with the top opening edge of the aeration tank. In addition, even when the aeration pipe device is pulled up above the aeration tank, the height of the device overhanging the aeration tank is short; for example, the ceiling of the space where the aeration tank is installed is low. The aeration pipe device can be reliably brought to an appropriate position for easy maintenance and inspection without any hindrance, and for the above reasons, it can be used as an aeration pipe device in aeration tanks under all conditions. It is wide. Furthermore, in this invention,
Since a retractable cover is provided around the sliding part of the second air pipe and the third air pipe, it is possible to prevent dirt from adhering to the sliding part and prevent smooth sliding, and it is possible to lift the device. This has the advantage that the third air pipe can be reliably and stably stored during hanging.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a side view of the device, Fig. 2 is a front view of the same, and Fig. 3 is an enlarged sectional view of the sliding part between the air diffuser pipe and the air supply pipe. , 4th
The figure is an enlarged sectional view of the engagement portion between the base air pipe and the base. 1...Aeration tank, 2...Base, 3...Base pipe,
4, 6... Rotatable joint, 5... First air pipe, 7
...Second air pipe, 8...Sealing device, 9...Third
Air supply pipe, 10... Air diffuser pipe, 14... Cylindrical cover,
21... Lifting drive device, 22... Cable, 24
... Guide roller, 25 ... Fixing tool, 26 ... Locking tool.

Claims (1)

[Scope of utility model registration request] A base pipe horizontally fixed to the upper edge of the aeration tank, a proximal end connected to one end of the base pipe via a rotary joint, and a distal end movable inside and outside the aeration tank. a first air pipe bent into an L-shape; a third air pipe, which has a leg piece at its tip that contacts the aeration tube and the bottom of the aeration tank, and whose base end side is slidably inserted into the second air pipe in its axial direction; , which covers the sliding parts of the second air pipe and the third air pipe, and has openings at the upper and lower ends that are fitted and fixed to the outer periphery of the second air pipe and the third air pipe, respectively. a cylindrical cover;
When each of the air pipes is vertically installed in a straight line in the aeration tank, the first air pipe and the second air pipe are brought into contact with each other to prevent relative rotation of the first air pipe and the second air pipe with respect to the direction in which the first air pipe extends outside the aeration tank. a set of protrusions fixedly provided on the first air pipe and the second air pipe for regulation, a lower end connected to the lower part of the third air pipe, and the other end connected to each of the air pipes; a lifting drive device for winding up the other end of the cable and lifting each of the air pipes onto the upper edge of the aeration tank; A fixing device capable of fixing the first air pipe to the base pipe so as not to rotate relative to the base pipe while the air pipe is vertically installed in the aeration tank, and after the cable is hoisted by a certain amount by a lifting drive device. An aeration pipe device for an aeration tank, comprising: a locking tool capable of fixing the middle of the cable to the outside of the bent portion of the first air supply pipe.