JPH047518Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention sets a bucket containing scraps into a preheating stand from above, and seals between the upper opening of the preheating stand and the outer periphery of the bucket. The present invention relates to a scrap preheating device for preheating scrap in a bucket by passing high-temperature gas into the bucket using the interior of the preheating stand as part of a passage.

[Prior Art] This type of preheating device is installed, for example, in steelmaking arc furnace equipment that melts and refines scrap using an arc, and preheats raw material scrap using high-temperature exhaust gas from the arc furnace. There is something.

Conventionally, such a scrap preheating device has a preheating stand 2 having a gasket 1 attached to the periphery of an upper opening, as shown in FIG. 4, and a hanging scrap bucket 3 is heated from above. When set in the preheating stand 2, by pressing the flange 4 on the outer periphery of the bucket 3 against the gasket 1, a seal is created between the upper opening of the preheating stand 2 and the outer periphery of the bucket 3. . After sealing the inside of the preheating stand 2 in this way, the scraps inside the bucket 3 are preheated by passing high-temperature gas into the bucket 3 using the inside of the preheating stand 2 as a part of the passage.

[Problems to be Solved by the Invention] Because the bucket cart 3 is hung and set in the preheating stand 2, each time the bucket cart 3 is set in the preheating stand 2, the position of the bucket cart 3 is slightly shifted.

In the case of the conventional preheating device as described above, in order to cope with the deviation in the set position of the bucket cart 3 in the preheating stand 2, the flange 4 of the bucket cart 3 is enlarged as shown in the figure to adjust the set position of the bucket cart 3. Regardless of the misalignment, the flange 4
hits the gasket 1 to seal the high-temperature gas. However, the bucket 3 having a large flange 4 is difficult to handle, and there is a problem that, for example, the flange 4 interferes with structures on the arc furnace and becomes a hindrance.

This invention solves these conventional problems.

[Means for solving the problem] The scrap preheating device of this invention sets a bucket containing scraps into a preheating stand from above, and seals between the upper opening of the preheating stand and the outer periphery of the bucket. In the scrap preheating device, which preheats the scrap in the bucket by passing high-temperature gas into the bucket with the inside of the preheating stand as part of the passage, a bucket is placed around the inner diameter of the upper opening of the preheating stand. A seal ring that is larger than the outer diameter of the bucket and that can be contracted to tightly contact the outer peripheral surface of the bucket when the diameter is contracted is provided so as to be movable in the horizontal direction, and is located at the periphery of the upper opening of the preheating stand along the periphery. The present invention is characterized in that an annular water tank is provided, and a downwardly extending portion located under water in the water tank is provided below the seal ring.

[Function] In the scrap preheating device of this invention, the seal ring provided at the upper opening of the preheating stand maintains a water seal between it and the preheating stand depending on the deviation of the set position of the bucket in the preheating stand. , and while moving horizontally, it contracts in diameter and comes into close contact with the outer periphery of the bucket 8, thereby always achieving a reliable gas seal.

[Example] Hereinafter, an example of this invention will be described based on FIGS. 1, 2, and 3.

1 and 2 are diagrams for explaining a first embodiment of this invention, and 5 in the figures is a preheating stand. This preheating stand 5 is provided with a gas outlet 5a on its lower side, and an annular water tank 6 is provided around the periphery of its upper opening. A seal ring 7 is provided at the top of the water tank 6 and located along the periphery of the upper opening of the preheating stand 5. The inner diameter of this seal ring 7 is larger than the outer diameter of the scrap bucket 8 set in the preheating stand 5, and is configured to be able to contract so that it comes into close contact with the outer periphery of the bucket 8 when the seal ring 7 is contracted. It is equipped with horizontal movement. Seal ring 7
A packing 9 is attached to the inner circumferential surface of.

The bucket 8 has a gas inlet 8a at its upper part, and a relatively small flange 8b is provided at its outer periphery.

The seal ring 7 in this example has circular arc structures 7a, 7b, 7c divided into four parts in the circumferential direction.
The combination of 7d forms a ring shape.
Those adjacent to each other overlap each other, and one side of the overlapping part has a long hole 7.
e, 7e, 7e, 7e are formed, and on the other side,
Pins 7 that fit into long holes 7e, 7e, 7e, 7e
f, 7f, 7f, 7f are provided. long hole 7
e, 7e, 7e, 7e are opened along the circumferential direction of the seal ring 7, and pins 7f, 7f, 7e are opened along the circumferential direction of the seal ring 7.
f, 7f are such long holes 7e, 7e, 7e,
It can be slid along 7e. Therefore,
By mutually shifting the components 7a, 7b, 7c, and 7d, the seal ring 7 itself becomes smaller or larger in diameter. Structures 7a, 7b, 7c, 7d
Pneumatic or hydraulic cylinders 7g, 7g, 7g, 7g are provided between adjacent ones of the cylinders 7g, 7g, 7g.
The seal ring 7 itself is configured to contract or expand in diameter by the expansion and contraction operations of g and 7g.

Below such a seal ring 7 is a water tank 6.
A downwardly extending portion is provided which is located in the water.

In the case of this example, floats 10, 10, 10, and 10 are provided below each of the constituent bodies 7a, 7b, 7c, and 7d of the seal ring 7 as the downwardly extending portions thereof. The seal ring 7 can freely move in the horizontal direction while floating in the water tank 6 due to the buoyancy of these floats 10, 10, 10, 10. The edge of the water tank 6 has a sliding surface 6a with the seal ring 7.
is formed.

Next, the effect will be explained.

Hanging bucket 8 containing scraps,
Set it into the preheating stand 5 from above.
Each time the bucket is set, the set position of the bucket 8 is slightly shifted. When the bucket bag 8 is set, the seal ring 7 is floating on the water in the water tank 6 while its diameter is expanded, and the bucket bag 8 is passed through the inside of the ring with plenty of room. The position of the seal ring 7 in its diameter-expanded state is indicated by a two-dot chain line in FIG. In the figure, the expanded diameter position of the left side portion of the seal ring 7 is indicated by a two-dot chain line. Naturally, the portion of the seal ring 7 on the right side in the figure is located on the outside, symmetrically with the left side portion. The seal ring 7 is not in a completely floating state, but is in a state in which it lightly touches the sliding surface 6a of the water tank 6, and its posture is stable.

After setting the bucket 8, the diameter of the seal ring 7 is reduced as shown by the solid line in FIG. A seal is formed between the opening and the outer periphery of the bucket 8.

At this time, the seal ring 7 reliably seals the space between the bucket bag 8 and the outer periphery of the bucket bag 8, regardless of the deviation of the set position of the bucket bag 8 within the preheating stand 5. That is, the seal ring 7 itself automatically moves in the horizontal direction depending on the position of the bucket bag 8 and contracts its diameter, so that it comes into close contact with the outer circumference of the bag bag 8.

Thereafter, high-temperature gas is introduced into the bucket 8 from the gas inlet 8a at the top of the bucket 8 to preheat the scrap inside. After preheating the scrap, the gas exits from below the bucket 8 and is led out from the gas outlet 5a of the preheating stand 5. A water seal is maintained between the seal ring 7 and the upper opening of the preheating stand 5. That is, the float 10 located underwater in the water tank 6 has a so-called water seal structure, and regardless of the movement of the seal ring 7 in the horizontal direction, it always seals between the seal ring 7 and the preheating stand 5. There is. Further, since the seal ring 7 and the bucket 8 are sealed, the gas inside the preheating stand 5 does not leak to the outside.

In this way, regardless of the misalignment of the set position of the bucket 8 in the preheating stand 5, and without increasing the size of the flange 8b of the bucket 8,
A reliable gas seal is provided.

FIG. 3 shows another embodiment of this invention.

In the case of this embodiment, a plate 11 is provided on the lower side of the seal ring 7 as a downwardly extending portion of the seal ring 7 located underwater in the water tank 6, and the seal ring 7 itself is provided on the edge of the water tank 6. Equipped with horizontal movement in all directions. Seal ring 7 to water tank 6
For example, it is possible to use an omnidirectionally movable trolley 12 as a means for mounting on the edge of the vehicle.

[Effects of the invention] As explained above, in the scrap preheating device of this invention, the seal ring maintains a water seal between the bucket and the preheating stand in response to a deviation in the set position of the bucket in the preheating stand. In addition, since the diameter is reduced while moving horizontally, the seal ring can be kept in close contact with the outer periphery of the bucket, regardless of the misalignment of the bucket in the preheating stand, and without providing a large flange on the bucket. A gas seal can be achieved.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams for explaining one embodiment of this invention; Figure 1 is a partially cutaway front view;
FIG. 2 is a plan view of the seal ring. FIG. 3 is a longitudinal cross-sectional view of the main parts for explaining another embodiment of this invention. FIG. 4 is a schematic configuration diagram for explaining a conventional example. 5... Preheating stand, 6... Water tank, 7... Seal ring, 8... Bucket, 10... Float (downward extending part), 11... Plate (downward extending part).

Claims (1)

[Scope of utility model registration request] Place the bucket containing the scraps into the preheating stand from above, seal between the upper opening of the preheating stand and the outer periphery of the bucket, and then use the inside of the preheating stand as part of the passageway to introduce hot gas into the bucket. In a scrap preheating device that preheats scrap in a bucket by passing the scrap through the periphery of the upper opening of the preheating stand, the inner diameter is larger than the outer diameter of the bucket and when the diameter is reduced, it comes into close contact with the outer peripheral surface of the bucket. A seal ring whose diameter can be reduced is provided so as to be movable in the horizontal direction, an annular water tank is provided along the periphery of the upper opening of the preheating stand, and below the seal ring,
A scrap preheating device characterized in that a downwardly extending portion is provided which is located under water in the water tank.