Metal deforming – By use of roller or roller-like tool-element – With handling of – or guiding of – work or product relative to...
Reexamination Certificate
1999-07-21
2001-02-27
Butler, Rodney A. (Department: 3725)
Metal deforming
By use of roller or roller-like tool-element
With handling of, or guiding of, work or product relative to...
Reexamination Certificate
active
06192729
ABSTRACT:
FIELD OF THE INVENTION
The invention has for an object a method and device for receiving and discharging bars. The device includes a couple of adjacent parallel rotating drums for receiving bars in longitudinal advancement and discharging them by dropping them onto an underlying cooling bed in a rolling mill plant.
BACKGROUND OF THE INVENTION
The production speed presently available in steel bars hot-rolling plants is about 35 m/sec. Such speed is difficult to increase. The main cause of this is the stand-off forced by the receiving of the rolling bars downstream of a well known “flying shear machine”. A bar is sent on one side of the shear machine, and another bar on the other side into a known receiving and discharging device comprising channelled rotating drums having four externally open channels on each drum. After receiving a bar in a channel of each respective drum, the drums alternately discharge the bars downward, via rotation, onto an underlying cooling bed.
Increasing the speed of this receiving and discharging device which works very well and is reliable, was up to now practically impossible because of the time associated with rotating the drums to move the respective receiving channel from a receiving position to a discharge position at which the bar is discharged, and then using the same channel for receiving the following bar after rotation of the drums. Attempts to increase the speed were made, but produced only a solution for forwarding and discharging two bars together (SPLIT art).
This art is well described in the Italian patent in the name of the same applicant IT-83489A/88. This solution however requires discharging two bars at a time onto the underlying cooling bed with risk of tangling. Additionally, this method is complex, requiring the crossing of the channels of the two drums.
SUMMARY OF THE INVENTION
The purpose of the present invention is that of increasing the speed of the receiving and discharging device without substantially changing its structure.
The problem is solved by providing a method for operating the device for receiving and discharging bars. The device includes a couple of adjacent parallel rotating drums for receiving bars in longitudinal advancement of the bars, and then discharging the bars by dropping them onto an underlying cooling bed in a rolling mill plant. Each drum is provided with four opposite channels rotating in unison, characterized in that the method is capable of first sending two bars in logical succession into two adjacent channels of a drum and, then sending another two bars in logical succession into two adjacent channels of the adjacent drum, and while a drum receives its two bars, the other rotates and discharges its two received bars. Advantageously the discharging occurs in two progressive steps. First, a drum is rotated for a certain angle for allowing the discharge of a first bar and then, the drum is further rotated to allow the discharging of the second bar.
Thus it is possible by using each drum, to discharge one bar at a time onto the respective cooling bed underlying the drums, which cooling bed will transversely shift the different bars. Thus tangling risks can be avoided and the speed at which the bars are received and discharged can be considerably increased. The advantages are immediate, considering that by this solution it is possible to increase the production speed of the whole rolling mill plant from 35 m/sec. to 50 or 60 m/sec., while reducing the accelerations and decelerations inertia times and dead times. This is accomplished by discharging two bars from one drum and then two bars from the other drum, as opposed to a single bar from each drum.
REFERENCES:
patent: 3610437 (1971-10-01), Barakov
patent: 4054047 (1977-10-01), Sclippa
patent: 1 127 813 (1986-05-01), None
patent: 1 225 986 (1990-12-01), None
Butler Rodney A.
S.I.M.A.C. S.P.A.
Wenderoth , Lind & Ponack, L.L.P.
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