JP3245251B2 - Metal fittings for impeller rotating shaft for molten metal processing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal fitting for an impeller rotary shaft for treating molten metal.

[0002]

2. Description of the Related Art In the prior art, Japanese Utility Model Laid-Open Publication No. 64-41100, a motor is disposed above a vertical through hole formed in a lid, and a rotating shaft 2 is rotated by the motor.
8 is connected to a vertical hollow rotary shaft 1 of refractory via a connection fitting, the hollow rotary shaft 1 is suspended from the through hole to face the molten metal treatment tank, and an impeller is provided at a lower end of the hollow rotary shaft 1. 4, the connection fitting comprises an upper fitting 29 attached to the rotating shaft 28 side and the hollow rotating shaft 1
A description is given of a connection fitting of an impeller rotary shaft for molten metal processing formed by a lower fitting 8 attached to the side and connecting the upper fitting 29 and the lower fitting 8 to each other.

[0003]

The connection fittings of the rotary shaft of the known impeller for processing molten metal are upper and lower connection fittings 8, 29.
There are problems that the shaft may be bent and attached, that the shaft may run out during rotation, that gas may leak, and that the shaft cannot be rotated at high speed when the shaft runs out. When the upper and lower connection fittings 8 and 29 are connected, the bolt 30 is inserted into a slightly larger vertical hole formed in the upper and lower connection fittings 8 and 29 and tightened with a nut. Since it is difficult to accurately match the vertical holes formed in the connection fittings 8 and 29, they may be mounted with a misalignment and bend, there may be a core runout during rotation, and gas may leak if the packing is misaligned, High speed rotation is not possible when there is runout.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention is to enable the upper and lower connection fittings to be accurately connected by a simple method without misalignment.

[0005]

According to the present invention, a motor 18 is provided at a position above a vertical through hole 19 formed in a lid 18.
A vertical hollow rotary shaft 11 made of a refractory is connected to a rotary shaft 21 rotated by the motor 18 via a connection fitting 13, and the hollow rotary shaft 11 is suspended from the through hole 19 to form a molten metal treatment tank. 1, the impeller 12 is attached to the lower end of the hollow rotary shaft 11, wherein the connection fitting 13 is an upper fitting 22 attached to the rotary shaft 21 side.
And a lower metal fitting 24 attached to the hollow rotary shaft 11 side. The upper metal fitting 22 has a vertical gas passage 25 provided at the center thereof and the gas passage 25 formed at the lower surface thereof.
And the lower metal fitting 24 has a left and right split structure,
When it is tightened and integrated from the left and right sides, it has a perfect circular truncated conical tapered projection 30 centered on the axis of the hollow rotary shaft 11 on the upper surface, and the tapered projection 30 is inserted into the tapered recess 26. This is a connection metal fitting for the rotary shaft of the impeller for molten metal processing, which is fitted from below to tighten and couple the upper metal fitting 22 and the lower metal fitting 24 together.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings.
1 and 2, reference numeral 1 denotes a molten metal processing tank, which has a peripheral wall 2 and a bottom wall 3 formed of a refractory material, an inlet 4 for supplying molten metal to the molten metal processing tank 1, and a molten metal processing tank 1. And a separation chamber 6 for floating slag.

[0007] An inflow port 7 through which floating scum flows into the separation chamber 6 is formed between the molten metal processing tank 1 and the separation chamber 6, and the other than the inflow port 7 is partitioned by a partition wall 8. In addition, the tap hole 5 is partitioned by a partition wall 10 which is a communication port 9 only at a lower portion so that floating slag does not flow into the tap hole 5.

In the center of the molten metal treatment tank 1, a vertical hollow rotary shaft 11 is provided.
The impeller 12 is attached to the lower end of the. The hollow rotary shaft 11 is connected to a motor 17 via a connection fitting 13, a flange unit 14, a rotary joint 15, and a chain coupling 16 as shown in FIG.
That is, reference numeral 18 denotes a cover of the molten metal treatment tank 1,
8 is formed with upper and lower through holes 19 through which the hollow rotary shaft 11 passes.
0 is provided, and a motor 17 is mounted downward on the upper part of the tower frame 20.

The rotary shaft 21 of the motor 17 projects downward, and the hollow rotary shaft 11 is connected to the lower portion of the rotary shaft 21 via the connection fitting 13. Is devised.

Hereinafter, the structure of the connection fitting 13 will be described with reference to the drawings. The connection fitting 13 is an upper and lower set of an upper fitting 22 and a lower fitting 24. The upper fitting 22 is formed of a material such as iron, and is entirely cylindrical. The lower end of the upper fitting 22 swells laterally to form an upper flange 23 integrally therewith. The flange portion 23 has a considerable vertical thickness, and has a circular disk shape when viewed from above. On the lower surface side of the upper flange portion 23, a circular truncated conical tapered recess 2 centered on a gas passage 25 provided at the center.
6 are formed. The peripheral wall of the tapered recess 26 forms a tapered surface 27 having a smaller diameter toward the upper part. The upper collar 2
A vertical hole 28 for bolt insertion is provided at a position outside the third tapered recess 26.

The lower bracket 24 has a left and right split structure, and is composed of a left block a and a right block b.
A half-split tapered projection 30 that fits tightly below the tapered recess 26 formed at the top of the half-split cylinder 29;
When the half-split tapered projection 30 is fitted into the tapered recess 26, a half-split lower flange 31 that abuts on the lower surface of the upper flange 23, and a left block a and a right block b are joined together from the left and right sides. And left and right protruding pieces 32 that come into contact with each other in order to be integrated with the lower metal fitting 24. A horizontal hole 33 for bolt insertion is formed in the protruding piece 32, and a vertical hole 34 that matches the vertical hole 28 is formed in the lower half flange 31. 35 is a bolt and 36 is a nut.

[0012]

Next, the operation will be described. A tower frame 20 is assembled above the through hole 19 of the lid 18 over the through hole 19, and a motor 17 is mounted on the upper part of the tower frame 20.
The upper bracket 22 is attached to the lower part of the unit 1 via the rotary joint 15 and the flange unit 14. Also, the left block a and the right block b, which are divided into two pieces, are abutted from the left and right sides at the upper end of a separately prepared refractory vertical hollow rotary shaft 11, and the left block a has a left protrusion. The piece 32 and the right protruding piece 32 of the right block b are aligned from the left and right sides, the lateral holes 33, 33 formed in each protruding piece 32, 32 are matched, a bolt 35 is inserted, and a nut 36 is screwed and tightened. In other words, the protruding pieces 32, 3 of the left block a and the right block b
2 are facing each other with some gap, so the lower bracket 2
4 is firmly attached to the vertical hollow rotary shaft 11.

In this case, the upper end of the vertical hollow rotary shaft 11 is positioned slightly lower than the upper end of the half-split tapered projection 30.

Next, a packing material 37 made of a refractory is placed on the upper end of the vertical hollow rotary shaft 11 and
4 together with the lower surface of the upper flange portion 23, and the upper tapered projection 30 of the lower metal fitting 24 is fitted into a truncated conical tapered recess 26 formed on the lower surface of the upper flange portion 23. When the vertical hole 28 formed in the lower metal fitting 23 is aligned with the vertical hole 34 of the lower flange 31 of the lower metal fitting 24, a bolt 35 is inserted from above and tightened with a nut 36, the tapered projection 30 of the lower metal fitting 24 becomes a tapered concave portion. As the nut 36 is tightened, the axes of the two are aligned by the action of the tapered surface 27 and the tapered projection 30 as the nut 36 is tightened. When the tightening is completed, the bend is corrected and rotated. However, there is no center swing and no gas leakage is obtained by the action of the packing material 37, and a precise product is obtained without any trouble.

[0015]

The connection fittings of the known impeller rotary shaft for molten metal processing are characterized in that when connecting the upper and lower connection fittings, the shaft may be bent, the rotation may cause a center runout, and gas leakage. However, there is a problem that high-speed rotation may not be possible when there is runout of the core.

However, according to the present invention, the motor 18 is provided above the vertical through hole 19 formed in the lid 18, and the refractory is connected to the rotating shaft 21 rotated by the motor 18 via the connection fitting 13. Vertical hollow rotating shaft 11 of
The hollow rotary shaft 11 is suspended from the through hole 19 to face the molten metal treatment tank 1, and an impeller 12 is attached to a lower end of the hollow rotary shaft 11.
Is formed of an upper fitting 22 attached to the rotating shaft 21 side and a lower fitting 24 attached to the hollow rotating shaft 11 side. The upper fitting 22 has a vertical gas passage 25 provided at the center thereof, A circular truncated conical tapered recess 26 centered on the gas passage 25 formed on the lower surface;
The lower metal fitting 24 has a right and left split structure. When the lower metal fitting 24 is tightened and integrated from the left and right sides, a circular truncated conical tapered projection 30 centered on the axis of the hollow rotary shaft 11 is provided on the upper surface thereof. The upper metal fitting 22 has a lower surface of the upper metal fitting 22 because the tapered projection 30 is fitted into the tapered concave portion 26 to form a connecting metal fitting for the rotation shaft of the impeller for molten metal processing, which tightens and connects the upper metal fitting 22 and the lower metal fitting 24. A circular truncated cone-shaped tapered recess 26 formed around a gas passage 25 provided at the center thereof, and a lower metal fitting 24 confronting the recess 26 has a circular truncated cone formed on the upper surface thereof. A tapered projection 30 is formed, and the tapered projection 30 is fitted into the tapered recess 26 to form an upper fitting 22 and a lower fitting 24.
So that

The more the shaft is tightened, the more the bending of the shaft is naturally corrected. There is no run-out when rotating. There is no gas leakage because it can be completely packed. Since there is no bending and there is no core runout during rotation,
Since it can be rotated at high speed, the degassing effect is large. This has the effect.

[Brief description of the drawings]

FIG. 1 is a plan view of a molten metal processing tank.

FIG. 2 is a longitudinal sectional view of a molten metal processing tank.

FIG. 3 is a side view of a main part.

FIG. 4 is a partial cross-sectional side view of an upper fitting.

FIG. 5 is a side view of a lower metal fitting.

6 is a right side view of FIG.

FIG. 7 is a left block side view of the lower bracket.

FIG. 8 is a side view of a connected state of an upper fitting and a lower fitting.

FIG. 9 is a sectional view taken along line AA.

FIG. 10 is a sectional view taken along line BB.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Molten processing tank, 2 ... Peripheral wall, 3 ... Bottom wall, 4 ... Mouth entrance, 5
… Tap hole, 6… Separation room, 7… Inlet, 8… Partition wall, 9…
Communication port, 10: partition wall, 11: vertical hollow rotary shaft, 12 ...
Impeller, 13: Connection fitting, 14: Flange unit,
15: rotary joint, 16: chain coupling, 17: motor, 18: lid, 19: through hole, 2
0: tower frame, 21: rotating shaft, 22: upper bracket, 23: upper flange, 24: lower bracket, 25: gas passage, 26: tapered recess, 27: tapered surface, 28: vertical hole, 29: half crack Cylinder, 30: half-cut tapered projection, 31: half-cut lower flange, 32: projecting piece, 33: horizontal hole, 34: vertical hole, 35: bolt, 36: nut, 37: packing material.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F27D 23/04 B01F 15/00 C22B 9/00

Claims (1)

(57) [Claims] 1. A vertical through-hole 1 formed in a lid 18.
9, a motor 18 is disposed at a position above
A vertical hollow rotary shaft 11 made of a refractory is connected to a rotary shaft 21 that rotates by a connecting fitting 13, and the hollow rotary shaft 11 is suspended from the through hole 19 to face the molten metal processing tank 1, and In the one in which an impeller 12 is attached to the lower end of the rotating shaft 11, the connection fitting 13 is connected to the rotating shaft 2.
The upper metal fitting 22 is formed by an upper metal fitting 22 mounted on one side and a lower metal fitting 24 mounted on the hollow rotary shaft 11 side. The upper metal fitting 22 has a vertical gas passage 25 provided at the center thereof and the lower metal fitting formed on the lower surface thereof. A circular truncated conical tapered recess 26 centered on the gas passage 25;
Has a right-and-left split structure, and has a right circular truncated cone-shaped tapered projection 30 centered on the axis of the hollow rotary shaft 11 on the upper surface when integrated by tightening from the left and right sides. A connection fitting for an impeller rotary shaft for molten metal processing, in which a tapered projection 30 is fitted into the tapered recess 26 from below and the upper fitting 22 and the lower fitting 24 are fastened and connected.