JPH07139556A - Connection fitting of impeller rotary shaft for molten metal treatment - Google Patents

Abstract

PURPOSE:To perform rigid installation, of a rotary shaft by providing an upper iron flange independently on or integrally with a driving shaft lower end, screwing a lower flange on an upper end of a hollow vertical rotary shaft made of fire-resistant material, fastening and fixing the flanges to each other by means of a bolt and a nut. CONSTITUTION:An upper iron flange 24 is screwed with a screw 23 of on a lower end outer periphery of an iron hollow rotary driving shaft 14. A plurality of upper longitudinal through-holes 25 are formed on an outer periphery of the upper iron flange 24. Lower longitudinal through-holes 32 are formed on a lower flange 27 correspondingly to the upper longitudinal through-holes 25. A packing 35 is inserted into a stepped portion on an upper side of an installation screw hole 29 of a tapered through-hole 30 of the lower flange 27. A screw 26 of a hollow vertical rotary shaft 11 is screwed with the installation screw hole 29, which shaft 11 is made of fire- resistant material such as carbon or ceramic. The lower flange 27 is fixed to an upper end of the hollow vertical rotary shaft 11. The lower flange is abutted against the upper iron flange 24. The upper longitudinal through-holes 25 correspond to the lower longitudinal through-holes 32. Fastening and fixation are carried out by a nut 34 through insertion of a bolt 33. substantial connection without run-out can thus be made.

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 rotating shaft for treating molten metal.

[0002]

2. Description of the Related Art In the publicly known Japanese Utility Model Laid-Open No. 63-16043, as shown in FIG. An upper iron flange c formed with a hole b is integrally formed, and the upper end of the hollow vertical rotation shaft d is made into a tapered cylinder e which is thinner toward the upper part, and a screw part i is continuously provided on the upper part of the tapered cylinder e. The taper insertion hole h of the lower flange g having several lower vertical threaded holes f formed in the outer peripheral portion is fitted to the outer periphery of the hollow vertical rotary shaft d, and the threaded portion i at the upper end of the hollow vertical rotary shaft d is the upper surface of the lower flange g. Impeller rotating shaft for treating molten metal, which is protruded into the concave portion m of the metal screw and tightened by screwing the nut j, and the upper vertical through hole b and the lower screw hole f are aligned and the bolt k is inserted and tightened. The connection fittings are illustrated.
Further, in the publicly known Japanese Utility Model Laid-Open No. 63-16043, as shown in FIG. 9 of the present application, an upper iron flange in which several upper vertical through holes b are formed in the outer peripheral portion on the lower end outer periphery of the drive shaft a. c is screwed into the upper end of the rotary shaft d to form a taper cylinder e which is thinner toward the upper end, and the taper cylinder is inserted into the taper insertion hole h of the lower flange g having several lower vertical through holes f formed in the outer peripheral portion. Then, a screw hole i is formed in the upper end portion of the rotating shaft d, and a recess m is formed in the upper surface of the lower flange g. A nut j is screwed into the screw hole i in the recess m, and the upper vertical transparent member is formed. The fitting for the impeller rotary shaft for molten metal treatment, in which the hole b and the lower vertical through hole f are aligned and the bolt k is inserted and tightened, is also illustrated.

[0003]

Of the above-mentioned known examples, the one shown in FIG. 8 only fixes the screw portion i by screwing and fixing the nut j, so that stress concentration occurs in the screw portion i during rotation.
There was a fear that the screw part i would be broken even if there was a slight runout. Also, in the case of FIG. 9, since the nut j is not screwed in sufficiently because it is in the recess m, the nut j
If the screw was not screwed in sufficiently, it could cause tremor. Further, although the screw portion i is formed on the rotating shaft d,
If the rotating shaft d is made of ceramic, the screw part i cannot be easily formed.

[0004]

Therefore, according to the present invention, the vertical hollow rotary drive shaft 14 rotated by the drive motor 18 is formed of a refractory material such as carbon or ceramics at the lower end thereof through the connecting fitting 13. A hollow vertical rotary shaft 11 to which an impeller 12 is attached is connected, and the rotary shaft 11 is rotated by the drive motor 18 to process molten metal. A separate or integral upper iron flange 15 having a vertical through hole 25 is provided, and a lower flange 27 having a plurality of lower vertical through holes 32 formed at the outer peripheral portion is screwed onto the upper end of the rotating shaft 11 to form the upper portion. The vertical through hole 25 and the lower vertical through hole 32 are aligned with each other, and a bolt 33 is inserted through the bolt and the nut is tightened and fixed by a nut to form a connecting fitting for the impeller rotating shaft for molten metal treatment. Further, in the present invention, in the above, a through hole 28 through which gas passes is provided at the center of the lower flange 27, and the through hole 28
Screw 26 engraved on the outer periphery of the upper end of the rotary shaft 11 at the bottom of the
Mounting screw hole 29 having a diameter larger than that of the through hole 28 for screwing
And a packing 35 is fitted to the inner side of the mounting screw hole 29, and then the screw 26 portion is screwed into the mounting screw hole 29 to tighten the metal molten metal processing impeller rotating shaft connecting fitting. It is what

[0005]

An embodiment of the present invention will be described with reference to the drawings.
1 and 2, reference numeral 1 denotes a molten metal treatment tank, which has a peripheral wall 2 and a bottom wall 3 formed of a refractory material, a molten metal inlet 4 for supplying the molten metal to the molten metal treatment tank 1, and the molten metal treatment tank 1 It has a tap hole 5 for the molten metal refined by and a separation chamber 6 for the floating slag.

An inflow port 7 through which a floating slag flows into the separation chamber 6 is formed between the molten metal treatment tank 1 and the separation chamber 6, and a partition wall 8 partitions the rest except the inflow port 7. Further, the tap hole 5 is partitioned by a partition wall 10 having a communication port 9 only at a lower portion thereof so that the floating slag does not flow out to the tap port 5.

A vertical hollow rotary shaft 11 is provided at the center of the molten metal treatment tank 1, and the hollow rotary shaft 11 is provided.
An impeller 12 is attached to the lower end of the. As shown in FIG. 3, the hollow rotary shaft 11 is connected to a motor 18 via a connection fitting 13, a hollow rotary drive shaft 14, a flange unit 15, a rotary joint 16 and a chain coupling 17. That is, 19 is the molten metal treatment tank 1
The lid 19 has upper and lower through-holes 20 through which the hollow rotary shaft 11 passes, and a through-frame 20 is provided above the through-holes 20. The motor 18 is mounted downward on the frame 21.

The rotary shaft 22 of the motor 18 projects downward, and the hollow rotary shaft 11 is connected to the lower side of the rotary shaft 22 through the connecting metal fitting 13. However, the present invention provides a hollow rotary drive shaft. The structure of the portion that connects the vertical hollow rotating shaft 11 and the vertical hollow rotating shaft 11 via the connecting fitting 13 is devised.

The structure of the connecting fitting 13 will be described below with reference to FIG. A screw 23 is engraved on the outer circumference of the lower end of the hollow iron rotary drive shaft 14, and an upper iron flange 24 is screwed onto the outer circumference of the screw 23. The hollow rotary drive shaft 14 and the upper iron flange 24 may be integrally structured as shown in FIG. 5, in which case the screw 23 is unnecessary. Several upper vertical through holes 25 are formed on the outer peripheral portion of the upper iron flange 24. A screw 26 is also engraved on the outer periphery of the upper end of the hollow vertical rotating shaft 11 formed of a refractory material such as carbon or ceramics. Two
Reference numeral 7 denotes a lower flange, which forms a through hole 28 through which gas passes, and the hollow vertical rotary shaft 11 is provided below the through hole 28.
An insertion hole 30 is formed in which a mounting screw hole 29 having a diameter larger than that of the through hole 28 into which the screw 26 of FIG. Insertion hole 3
The portion below the mounting screw hole 29 of 0 is formed to have a larger diameter toward the lower portion. Below the screw 26 of the hollow vertical rotary shaft 11, a taper portion 31 having a larger diameter toward the lower portion, which fits into the tapered insertion hole 30, is formed.

The lower flange 27 is formed with a lower vertical through hole 32 which matches the upper vertical through hole 25 formed on the outer peripheral portion of the upper iron flange 24, and the upper vertical through hole 25 and the lower vertical through hole 3 are formed.
Insert bolt 33 into 2 and tighten with nut 34. Three
Although 5 is a packing and 36 is an O-ring annular groove, the annular groove 36 may not be provided.

[0011]

The impeller 12 is attached to the lower end of the hollow vertical rotary shaft 11. Next, the packing 35 is inserted into and fixed to the stepped portion above the mounting screw hole 29 at the back of the tapered insertion hole 30 of the separately formed lower flange 27, and the screw 26 portion formed on the upper end of the hollow vertical rotary shaft 11 is fixed. Is fitted into the tapered insertion hole 30 of the lower flange 27 and rotated as shown in FIG.
The screw 26 of the hollow vertical rotary shaft 11 is screwed into the mounting screw hole 29 at the back, and the lower flange 27 can be fixed to the upper end of the hollow vertical rotary shaft 11. In this case, as shown in FIG. 7, the screwing is performed by holding the hollow vertical rotary shaft 11 with a vise and rotating the lower flange 27 with a tool while visually checking the packing 35 from above. Since it suffices, it can be easily and easily screwed.

In this way, the lower flange 27 fixed to the hollow vertical rotary shaft 11 is either the upper iron flange 24 screwed to the lower end of the hollow rotary drive shaft 14 or the hollow rotary drive shaft 1.
4 is brought into contact with the lower surface of the upper iron flange 24 that is integrally bulged at the lower end of 4, and the upper vertical through hole 25 and the lower vertical through hole 32 are aligned, and then the bolt 33 is inserted and tightened with the nut 34. Fix it.

When the drive motor 18 is energized in this state, the hollow rotary drive shaft 14 is rotated, the hollow vertical rotary shaft 11 is rotated through the connecting fitting 13, and the molten metal is stirred by the impeller 27. Hydrogen gas and non-metallic inclusions contained in are removed.

[0014]

As described above, among the known examples, the one shown in FIG. 8 only fixes the screw j by screwing the nut j into the screw i. There was a fear that the screw part i would be broken due to the runout. Further, in the case of FIG. 9, since it is inside the recess m, the nut j may not be screwed sufficiently, and when the nut j is not screwed sufficiently, runout may occur. Further, although the screw portion i is formed on the rotating shaft d, if the rotating shaft d is made of ceramic, the screw portion i cannot be easily formed. However, the present invention is based on the drive motor 1
8 is connected to the lower end of a vertical hollow rotary drive shaft 14 which is made of a refractory material such as carbon or ceramics and has an impeller 12 attached to the lower end thereof via a connecting fitting 13. 11 for rotating the molten metal by rotating the driving motor 18 with the driving motor 18, a separate or integral upper iron flange 1 in which several upper vertical through holes 25 are formed in the outer peripheral portion at the lower end of the driving shaft 14.
5, a lower flange 27 having several lower vertical through holes 32 formed in the outer peripheral portion is screwed into the upper end of the rotary shaft 11 to align the upper vertical through hole 25 with the lower vertical through hole 32. Is used as a connecting fitting for an impeller rotary shaft for molten metal treatment, in which a bolt 33 is inserted and tightened and fixed by a nut 34, and in particular, several lower vertical through holes are provided on the upper end of the rotary shaft 11 in the outer peripheral portion. Since the lower flange 27 formed with 32 is attached by screwing, since the rotary shaft 11 and the lower flange 27 are screwed together, it is far more robust than the known nut fixing. There is no sway. The rotary shaft 11 and the lower flange 27 can be screwed together easily and securely because one of them can be held with a vise and the other can be rotated with a tool. Further, it is inexpensive because it is not necessary to separately manufacture the nut as is known. Further, in the present invention, in the above, a through hole 28 through which gas passes is provided at the center of the lower flange 27, and a screw 26 engraved on the outer periphery of the upper end of the rotary shaft 11 is screwed into the lower portion of the through hole 28. A mounting screw hole 29 having a diameter larger than that of the through hole 28 is engraved, and a packing 35 is fitted to the back side of the mounting screw hole 29, and then the screw 26 portion is screwed into the mounting screw hole 29 and tightened. Since it is used as the connecting fitting of the impeller rotating shaft for treating the molten metal, the packing 35 on the back side can be tightened while looking, and therefore the assembly and replacement are easy.

[Brief description of drawings]

FIG. 1 is an overall plan view of a molten metal processing apparatus.

FIG. 2 is a vertical sectional side view of FIG.

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

FIG. 4 is a vertical sectional view of a main part.

FIG. 5 is a second embodiment diagram.

FIG. 6 is an exploded sectional view of a hollow vertical rotary shaft and a lower flange.

FIG. 7 is a tightened state diagram of the hollow vertical rotation shaft and the lower flange.

FIG. 8 is a first known example diagram.

FIG. 9 is a second known example diagram.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Melt processing tank, 2 ... Peripheral wall, 3 ... Bottom wall, 4 ...
… Spa outlet, 6… separation chamber, 7… inlet, 8… partition wall, 9…
Communication port, 10 ... Partition wall, 11 ... Vertical hollow rotating shaft, 12 ...
Impeller, 13 ... Connection fitting, 14 ... Hollow rotary drive shaft, 1
5 ... Flange unit, 16 ... Rotary joint,
17 ... Chain coupling, 18 ... Motor, 19 ...
Lid, 20 ... Through hole, 21 ... Turret frame, 22 ... Rotating shaft, 23
… Screw, 24… Upper iron flange, 25… Upper vertical through hole,
26 ... Screw, 27 ... Lower flange, 28 ... Through hole, 29 ...
Mounting screw hole, 30 ... Insertion hole, 31 ... Tapered portion, 32 ...
Lower vertical through hole, 33 ... Bolt, 34 ... Nut, 35 ... Packing, 36 ... Annular groove for O-ring.

Claims (2)

[Claims] 1. A hollow vertical rotary shaft 11 which is made of a refractory material such as carbon or ceramics at a lower end of a vertical hollow rotary drive shaft 14 which is rotated by a drive motor 18 and has a lower end to which an impeller 12 is attached. In which the rotating shaft 11 is rotated by the drive motor 18 to process the molten metal, a separate body in which several upper vertical through holes 25 are formed in the outer peripheral portion at the lower end of the drive shaft 14 or The rotary shaft 11 is provided with an integral upper iron flange 15.
A lower flange 27 having a plurality of lower vertical through holes 32 formed on the outer peripheral portion is screwed into the upper end of the nut, and the upper vertical through hole 25 and the lower vertical through hole 32 are aligned with each other to insert a bolt 33 into the nut. Connection fitting for the impeller rotating shaft for molten metal processing, which is fixed with 34. 2. The lower flange 2 according to claim 1.
A through hole 28 through which a gas passes is provided at the center of 7, and a screw 26 having a diameter larger than that of the through hole 28 into which a screw 26 engraved on the outer periphery of the upper end of the rotating shaft 11 is screwed at a lower portion of the through hole 28. And a packing 35 is fitted to the inner side of the mounting screw hole 29, and then the screw 26 portion is screwed into the mounting screw hole 29 to tighten the metal molten metal processing impeller rotating shaft connecting fitting. .