This invention relates generally to hot rolling mills producing bars and other like long products, and is concerned in particular with pouring reels employed to receive and form such products into cylindrical coils.
Current pouring reels operate as the name implies. A bar product is effectively poured or fed via a nozzle into a rotating tub having radially spaced inner and outer walls defining an annular chamber closed at its lower end by a fixed tub bottom. The tub runs at a synchronous velocity to that of the entering bar.
The nozzle is positioned such that when the bar enters the annular chamber, it contacts the outer tub wall at a tangent angle and then runs on the inner tub wall to form a spiral which accumulates as a cylindrical coil that starts at the tub bottom and forms itself vertically upward to fill the tub.
Such conventional pouring reels operate satisfactorily at bar delivery speeds up to and including about 16 m/sec. At higher speeds, however, the bar entering the tub is subjected to excessively high centripetal forces, which prevent the bar from feeding to the bottom of the tub as intended. The coil thus forms erratically and non-uniformly, with a lower than desired density. In extreme cases, the height of the low density coil is such that it spills out from the tub, creating both production problems and safety issues.
Also, in order to direct the product downwardly towards the tub bottom, the delivery nozzle is of necessity inclined at a relatively steep delivery angle, typically on the order of 50°. As a result, the tail end of the bar sticks up from the top of the coil at the same angle and must be pushed flat before the coil can be subjected to further processing.
Broadly stated, the objective of the present invention is to provide an improved pouring reel which avoids or at least substantially mitigates the above described problems.
In an exemplary embodiment of the present invention to be described hereinafter in greater detail, a pouring reel for forming a hot rolled long product into an annular coil comprises a central mast lying on a vertical axis. A cylindrical tub surrounds and cooperates with the central mast to form an annular tub chamber. A coil plate defines a bottom of the tub chamber. The central mast, cylindrical tub and coil plate are rotatable in unison about the vertical axis. An entry nozzle has a delivery end arranged to direct the product downwardly into the tub chamber for accumulation on the coil plate as a series of superimposed rings forming the coil. The coil plate is movable downwardly along the vertical axis and relative to the central mast and the cylindrical tub to accommodate the increasing height of the coil being formed in the tub chamber.
Vertically traversable conveying elements are circumferentially spaced around and extend vertically along the interior surface of the cylindrical tub. The conveying elements are traversed downwardly and synchronously with the descending coil plate. Preferably, this is achieved by coupling the conveying elements to the coil plate, although equivalent results may be achieved by separate drive mechanisms.
As herein employed, the term “conveying elements” is intended to be broadly construed to include various vertically extending and longitudinally traversable elements, including for example conveyor chains, conveyor belts, etc.
The conveying elements may comprise the inner runs of endless chains or belts arranged to extend between upper and lower idlers carried by the cylindrical tub.
The endless chains or belts may have outer return runs extending vertically along the exterior surface of the cylindrical tub.
The conveying elements may be received in and be traversable along guide channels in the interior surface of the cylindrical tub.
The conveying elements may project radially inwardly from the interior surface of the cylindrical tub.
Downward movement of the coil plate may also serve to maintain a substantially constant distance between the delivery end of the nozzle and the top of the coil being formed in the tub chamber.
The entry nozzle may be arranged at an angle of between 25° and 35°, and preferably at an angle of 30°, with respect to the horizontal.
These and other features and attendant advantages of the present invention will now be described in further detail with reference to the accompanying drawings.
An exemplary embodiment of a pouring reel in accordance with the present invention is generally depicted at 10 in
With reference additionally to
A cylindrical tub 18 projects upwardly from the outer edge of base 16. The tub surrounds and cooperates with the mast 14 to form an annular chamber 20. A coil plate 22 defines a bottom of the annular chamber. As can be best seen in
The central mast 14, cylindrical tub 18 and coil plate 22, together with the base 16, are rotatable in unison about the vertical axis A. Typically, such rotation will be at a synchronous velocity to that of the product entering the pouring reel, with the nozzle 12 being inclined as shown in
In addition to being rotatable, the coil plate 22, is vertically adjustable along axis A and relative to the central mast 14 and cylindrical tub 18. Such vertical adjustment may be achieved by an axially reciprocal central shaft 26. During a coil forming cycle, the coil plate 22 is gradually lowered to accommodate the increasing height of a coil being formed in chamber 20, while also maintaining a substantially constant distance between the delivery end of the nozzle 12 and the top of the growing coil.
Vertically traversable conveying elements 28 are circumferentially spaced around the interior surface of the cylindrical tub. With reference to
The inner conveyor runs serving as the conveying elements may include face plates 36 that project radially inwardly as at 38 from the interior surface of the tub 16, and are thus positioned to be contacted by the entering product being urged radially outwardly by centripetal forces.
As the coil forms, the coil plate will descend at the correct rate selected to prevent the coil from spilling out of the top of the tub 18. The rate of descent will vary depending on product size and the delivery speed of the rolling mill.
The centripetal forces that might otherwise prevent the coil from forming uniformly from the fixed bottom of a conventional pouring reel tub are now employed advantageously. If and when the product is subjected to high centripetal forces when handling products at delivery speeds exceeding about 16 m/sec, the vertically traversable conveying elements 28 connected to the coil plate 22 will move the product in contact therewith in the correct direction allowing the next ring to be formed in an orderly manner.
Controlling the rate of coil plate descent controls coil formation. If a tight dense coil is required, the coil plate and conveying elements are moved downwardly at a slower rate. On the other hand, if a more open coil is required, the rate of descent can be increased, thus potentially leaving a small gap between each subsequent ring formed against the descending liner elements.
This application is a 371 of PCT Application No. PCT/US2016/066620 filed Dec. 14, 2016, which claims priority to provisional application Ser. No. 62/277,103 filed Jan. 11, 2016, the contents of which are incorporated herein by reference.
Filing Document | Filing Date | Country | Kind |
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PCT/US2016/066620 | 12/14/2016 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
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WO2017/123374 | 7/20/2017 | WO | A |
Number | Name | Date | Kind |
---|---|---|---|
434190 | Matteson | Aug 1890 | A |
3618871 | Gilvar | Nov 1971 | A |
3955773 | Blinn | May 1976 | A |
5823456 | Bordignon | Oct 1998 | A |
20070063088 | Schlichter | Mar 2007 | A1 |
20090249852 | Shore | Oct 2009 | A1 |
Number | Date | Country |
---|---|---|
2057899 | May 1972 | DE |
2057899 | May 1972 | DE |
S5011960 | Feb 1975 | JP |
S50100464 | Aug 1975 | JP |
S5571862 | May 1980 | JP |
S6336917 | Feb 1988 | JP |
S63140725 | Jun 1988 | JP |
2011516272 | May 2011 | JP |
2009123685 | Oct 2009 | WO |
Entry |
---|
International Search Report issued in related PCT Application No. PCT/US2016/066620 dated Mar. 22, 2017. |
Office Action issued by the Japanese Patent Office dated Oct. 21, 2019 in related Japanese Patent Application No. 2018-536102. |
Office Action issued by the European Patent Office dated Jan. 30, 2020 in related European Patent Application No. 16822335.2. |
Number | Date | Country | |
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20200261956 A1 | Aug 2020 | US |
Number | Date | Country | |
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62277103 | Jan 2016 | US |