Fluid handling – Processes – Cleaning – repairing – or assembling
Reexamination Certificate
1999-10-13
2001-07-24
Lee, Kevin (Department: 3753)
Fluid handling
Processes
Cleaning, repairing, or assembling
C222S590000, C222S600000
Reexamination Certificate
active
06263897
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a slide valve plate (hereinafter sometimes referred to simply as “plate”), and in particular, a slide valve plate suited to re-use (recycle) and a method of making the same.
2. Description of the Related Art
Conventionally, a new plate for controlling the discharging amount of a molten metal from a molten metal vessel is in general mainly composed of a stationary plate and a movable plate which are secured by metal fixtures to a lower part of the molten metal vessel, and the movable plate is secured with a nozzle at its lower part.
The movable plate is slidingly contacted to the stationary plate, so that orifices formed therein are made agree to discharge the molten metal, or are made disagree to control or stop the issue of the metal.
The plate suffers serious damages by the molten steel while using, and recently from economical pointview, it has eagerly been demanded for its re-using, and there have already been proposed several methods therefor.
FIG. 4
shows a plate capable of re-using. For example, the orifices are especially seriously damaged in the movable plate S or the stationary plate K of the used plate and are hollowed out in circle by a boring process so as to form a through hole
42
into which a cylindrical straight ring
43
is engaged and inserted. Then, the sliding face of the plate is ground to fall into tolerance of the same smoothness as that of a new plate. As a cushioning plate to be furnished to a non-sliding face of the plate, the same cushioning plate as a firstly used cushioning plate is re-used. In
FIG. 4
, numerals
41
,
42
and
44
represent a plate main body, a through hole, an orifice, respectively.
However, according to this method, there was a risk that the straight ring
43
fitted in the through hole
42
would slip out while working.
For improving such matter, when re-producing the through hole of the movable plate S, the overall orifices of the molten metal in the plate are hollowed out, and a cylinder having a ring shaped jaw part is inserted therein and fixed with a mortar (JP-A-5-200531).
As the method disclosed in JP-A-5-200531 inserts the cylinder having the ring shaped jaw part in the hollowed parts and fixes with the mortar, the cylinder can advantageously be prevented from slipping out as happening conventionally, but when removing the cylinder having the damaged ring shaped jaw part and inserting a cylinder having a new ring shaped jaw part so as to fix with the mortar, problems involved are that it is difficult to remove the cylinder of the damaged jaw part, and at the same time the plate itself might be injured.
Especially, when the connection between the jaw part and the plate is cancelled, the plate is injured so that a grinding amount of the plate is increased by the injured amount, and such a problem occurs that difficulty is increased in grinding the sliding face of the plate to fall into tolerance of the same smoothness as that of a new one.
Further, by increasing of the grinding amount, the thickness of the plate is decreased and accordingly the strength thereof is lowered.
The invention has been realized in view of such problems.
SUMMARY OF THE INVENTION
It is an object of the invention to offer a slide valve plate where it is easy to remove a sleeve having a damaged jaw part with less breakage in the plate face and injury in the edge part of the through hole, and it is easy to grind the plate face for re-using of the plate.
In view of re-using the plate, inventors of this patent application made investigations and studies on conditions of connecting and separating of the sleeve having the jaw part and the plate, and have found the followings and accomplished the invention.
(1) With respect to damages in the plate caused when separating the sleeve and the plate, the damage caused in a part corresponding to the sleeve has less problems in the grinding work for removing the damage and re-using in comparison with the damages caused in the part corresponding to the jaw part and in the edge of the through hole.
(2) With respect to the connection between the sleeve and the plate, even if an extent of the connection at the jaw part is weak but if it is strong at the sleeve, the connection is sufficient as a whole.
That is, the inventive slide valve plate for controlling an amount of a molten metal flowing, comprising a slide valve plate main body having a through hole (penetrating hole) at a part corresponding to a molten metal orifice and a sleeve having a jaw part to be fitted in the through hole, is characterized by interposing a releasing member between the surface of the plate main body and/or the vicinity of an edge of the through hole and the jaw part of the sleeve and/or the vicinity of the jaw part (a first aspect of the invention) . This is a subject matter of the invention, and in particular, the invention is preferably characterized in that the releasing member is a parchment paper (a second aspect of the invention).
Further, the inventive method of making a slide valve plate for controlling an amount of a molten metal flowing, comprising the slide valve plate main body having a through hole at a part corresponding to a molten metal orifice and the sleeve having the jaw part, is characterized by comprising the steps of:
A. turning upward an injured sliding face of a used slide valve plate, punching the sleeve having the jaw part through the through hole, and adjusting the through hole after having punched the sleeve through the through hole;
B. setting a releasing member at a part corresponding a jaw part of a new sleeve and/or the vicinity of the edge part of the through hole, around the through hole of the surface of the used plate main body after having punched the sleeve through the through hole, otherwise coating or blowing a solution for forming the releasing member, and thereafter fitting the new sleeve in the through hole of the plate main body, and joining and integrating (integrally joining) them with a mortar; and
C. grinding the face of an opposite side to the injured sliding face of the used plate fitted with the new sleeve so as to form a new sliding face (a third aspect of the invention).
The above steps define the inventive items.
Still further, the inventive method of making a slide valve plate for controlling an amount of a molten metal flowing, comprising a slide valve plate main body having a through hole at a part corresponding to a molten metal orifice and the sleeve having the jaw part to be fitted in the through hole, is characterized by comprising the steps of: setting a releasing member at a part corresponding a jaw part of a new sleeve and/or the vicinity of the edge part of the through hole, around the through hole of a new slide valve plate main body, otherwise coating or blowing a solution for forming the releasing member; and thereafter fitting the new sleeve in the through hole of the plate main body and joining and integrating them with a mortar (a fourth aspect of the invention).
The above steps define the further inventive items.
REFERENCES:
patent: 5020703 (1991-06-01), McQuillen, Jr. et al.
patent: 5284278 (1994-02-01), Waltenspuhl
patent: 5529227 (1996-06-01), Yoshikawa et al.
patent: 5730892 (1998-03-01), Niwa et al.
Saeki Tsunenobu
Yoshimura Yuji
Lee Kevin
Shinagawa Refractories Co. Ltd.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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