This invention has for object a device for the high speed discharge of bars and sections on cooling bed in hot rolling mill plants.
The speeds existing in the steel bars hot-rolling plants is of about 12 - 13 m/sec for systems with openable channel or with reciprocating movement and of about. 35 m/sec for rotating drum-channels.
Increasing this speed is difficult.
This invention is substantially intended for stock receiving and discharge devices with channels provided with openable means with reciprocating oscillating movement.
The main cause is in the stand-off forced by the receiving of the rolling bars downstream of the "flying shear", that cuts the continuous rolled section or bar stock, into pieces deviating it by sending a bar on one side and a bar on the other in a known stock receving device that receives the bar by two parallel adjacent channels.
The channels are generally openable and closable and/or provided with other movement for discharging the bars received in turn on the underlying cooling bed.
This solution is preferably intended for the production of small sections, which is penalised by roller ways and cursors, respect to bigger sections due to said speed limit.
This and other pre-existing rolling mill plants have in any way some faults and by increasing the speed there is a risk of tangling and the straightness is endangered and distortions may occur.
These faults are particularly serious and frequent, so downstream of the cooling bed (toothed plate), they must be picked up and straightened with consequent very high costs.
Purpose of the present invention is of increasing the production speed of the small sections (shaped like angles "L", and T, U sections, square sections, hexagon sections, window sections, flat-shaped, and so on.) without however endangering their straightness, avoiding screwing not accepted by the market or by machines for the subsequent processing.
This and other aims are reached as claimed by a device for receiving bars and sections and discharging them on a underlying cooling bed involving a toothed plate, in rolling mill plants, of the type which includes movable "U" shaped channels closable by covers, for the bars receiving, characterised in that it is structured by the following combined characteristics:
In this way a reliable and simple device is realized that allows an higher speed and a better work performance without damaging the material or tangling it.
Advantageously the number of said channels is two, an internal one toward said toothed plate and an external one, and in which they lay coplanar, and the internal one extends downwards with an arm to act as a momentary stop of the advancement of the bars deposited upstream by said external channel in said transfer.
In this way the system operativeness is improved .
The method for operating is advantageously concretized as follows:
Advantageously said channels are offset in height and the internal one is at an higher level than the external one and in which the respective arms are of the oscillating type, hinged on the outside and such not to interfere one respect to the other in the respective movement.
This setting allows to further improve the operativeness. The operating method is advantageously concretized as follows:
These and other advantages will appear from the following description of two preferred embodiments, with the aid of the included drawings, whose details are not to be considered as limitative but only supplied as an example.
Figure 1 is a schematic front cross sectional view on the vertical-plane of a first solution of the device for the receiving and discharging of bars according to the present invention.
Figure 2 is a schematic view of the plant of Fig. 1 in the respective phases A),B),C),D)E), of its working.
Fig. 3 is a view of a alternative solution as regards the solution of Fig.1.
Fig.4 shows the phases of the solution of Fig.3.
As disclosed by the above shown figures: by (5) the device for receiving and discharging bars in its ensemble is indicated and by (6) the underlying cooling bed.
The underlying cooling bed (6) includes a transversal translator with endless chains or endless tape or rollers herein called endless transfer means (61), upstream of a known translating system with toothed plane called cooling plate or toothed plate (62) which notoriously works comb-like to move a bar from a seat (between two teeth) to the other.
The upper placed device for the bars receiving and discharging (5) includes two parallel and adjacent channels arranged on horizontal-plane above the underlying bed 6.
Each channel is made up of an upper part as cap (51) and lower part as a real "U" shaped channel (52), the lower part (52) is movable to open and discharge the bar received on the underlying bed.
The bars are indicated by way of examples by 1,2,3,4 for locating them in logic succession of arrival, in order to understand the mechanism or receiving and discharging system.
As claimed, the invention therefore consists of two channels whose lower part, substantially "U" shaped (52), is vertically movable (or almost vertically).
These lower parts make up the true channels for alternatively receiving the bars cut to measure downstream of the rolling mill and downstream of a known flying shear not illustrated but of prior art, while the upper part (51) substantially, as said, acts as a cap.
On the channels entry two bar-brakers with rollers shaped according to the section shape are provided, not illustrated but of prior art known in this sector.
The two channels alternatively discharge the bars above the underlying transfer (61) that will carry it towards the plate (52), which will receive them by placing them one for each tooth (toothed seat).
The internal channel placed toward the plate must also retain the bar discharged from the external channel in order to space it from the bar 2, 3 and allow the plate (62) to rotate (advance in rotational movement) avoiding charging the bar 1 on the same tooth occupied by the bar 2.
For this reason the internal channel during its lowering will stop in intermediate position in order to remove the bar 2 and retain the bar 1.
By carrying out the lowering of the internal channel, the bar 1 is made free.
The lifting / lowering control of the two channels may be of different type (520):
The upper closure of the channels is supported by a longitudinal beam (50), fixed to ground by a series of columns.
As shown in Figures 2-3 the lower parts that make up the "U" shaped channels lift and lower up to being under the advancing line of the endless transfer means (61).
In this way, when they have been lowered beneath it, the bar is taken by the transfer (61) that translates it on the toothed plate (62), etc.
Figures 3 and 4 substantially show a variation in which the lower "U" shaped movable channels, are moved by oscillating arms (520).
This second solution better eases the laying on the endless transfer means (61) giving the bars also an advancing component.
In the transferring phases of Fig. 2 it can be seen that:
The cycle is repeated.
In the solution of Figs. 3, 4, it can be seen that the two channels are offset, that is they are placed at a different height and the internal one higher than the external one, the cycle instead is the following:
Of course as said the transferring device may be of any type, at the most also a tilted plane.