DE1228646B - Method and device for the transport of billets through a pusher furnace - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

C21d

German class: 18 c-9/70

Number: 1228 646

File number: M 55430 VI a / 18 c

Filing date: January 15, 1963

Opening day: November 17, 1966

The invention relates to a method and a device for the transport of billets, especially those of more than 10 m in length, through a pusher furnace, in the direction of the individual billets their longitudinal axis are pushed in. The billets 5 are heated in the pusher furnace and wander through these lying against one another in the direction transverse to their longitudinal axis until they reach the desired temperature and have reached the ejection position in which they are ejected from the oven.

Pusher furnaces of the type mentioned and the known methods for transporting the heat material over the Pusher soles have generally proven themselves well in the past, provided the billet length is a does not exceed a certain level. With the billets used in modern wire or fine steel mills however, over 10 m in length, difficulties in ejecting were increasingly encountered the stick. As the weight of the finished bundles increases by up to 1000 kg, they can be reached in the pusher furnace Billets to be heated up to a length of 30 m. However, billet lengths of over 10 m result as a result the high weight of the stick and the large frictional resistance when ejecting it the stick bends upwards or to the exposed side and often bends so much that that it can only be removed from the furnace with great difficulty and for further processing becomes unusable. The amount of effort required to remove a bent billet Time and costs are increased by the fact that the downstream rolling mill is also in this time must be stopped. There is also the risk that the billets, which have a temperature of over 1000 ° C, melt together when warping or bending a billet, so that under certain circumstances an entire furnace batch, but at least several billets, cannot be used for rolling and must be removed from the oven. Bringing in and out such long billets is so far only in walking beam ovens, in particular those described in French patent 1150 693 Design, possible without difficulties.

The object underlying the invention is now the warping and bending of the Billets, especially those of more than 10 m in length, when ejected from the tried and tested To avoid pusher furnaces and thus their susceptibility to failure as well as the downtimes of the downstream To reduce wire lines considerably or to eliminate them entirely.

This object is achieved in that the knotting method and device for transport
of billets through a pusher furnace

Applicant:

Morgan Construction Company,

Worcester, Mass. (V. St. A.)

Representative:

Dr. H. Maeckler, lawyer,

Düsseldorf, Bleichstr. 14th

Named as inventor:

Paul E. Smith, Worcester, Mass. (V. St. A.)

Claimed priority:

V. St. v. America January 26, 1962 (168 970)

pel is not transported through the pusher furnace in a straight shape, as has been the case up to now, but with a slight curvature will. In detail, the solution is that the billets during the transverse transport through the furnace interior in an approximately vertical and an approximately horizontal plane be bent so that, seen in the direction of transport, the two ends of a stick his Run ahead of the middle section or lie higher than it. By bending the pusher furnace in this way traversing billet is achieved that every billet brought into the push-in position during against its ejection movement by means of an ejection rod pressing against its rear end face the also curved side surface of the adjacent stick is pressed, whereby the thereby resulting increased frictional resistance at the same time prevents bending of the billet upwards. The counterforce resulting from the frictional resistance is, moreover, still due to the inventive Bending of the billet down supported, so that even if the frictional resistance should not be sufficient, the stick must first compensate for this oppositely directed arc before he can bend freely upwards. The same way is due to the opposite

609 727/311

Pre-curvature of the billet also bends horizontally in the direction of the free side of the billet avoided.

The device for carrying out the method according to the invention essentially consists of a pusher type furnace of the type described above, but in which the individual adjacent According to the invention, the ram different from the desired pre-bending of the billet in the horizontal have corresponding lengths. In addition, according to the invention, the stove hearth is corresponding the desired bending of the billet in the vertical pan-shaped, whereby he, in the direction of the transverse transport of the billet, is inclined slightly upwards.

The invention is illustrated below using an exemplary embodiment in the drawing Pusher furnace according to the invention explained in more detail. It shows

F i g. 1 shows a horizontal cross section of the furnace,

F i g. 2 shows a vertical longitudinal section along the line 2-2 in FIG. 1 and

F i g. 3 is a vertical cross-section along the line 3-3 in FIG. 1.

The pusher furnace according to the invention has side walls 12 and 14 and end walls 16 and 18 is located in the end wall 16 in the immediate vicinity of the side wall 12, a push-in opening for billets 22 to be heated. The billets 22 are driven by a ram 24 and a motor 30 Rollers 28 of a reciprocating loading device 26 driven via a gear 32 fed.

On the other side of the end wall 16, i.e. in the immediate vicinity of the side wall 14, has the pusher furnace 10 has a further opening 34 through which the ram 36 of an ejector 38 into the Furnace arrives and during its movement the foremost of those lying on the sole 40 of the pusher furnace 10 Ejects stick. For this purpose, the pusher furnace 10 has an ejection opening opposite the opening 34 42, through which the respectively exiting billet in the rolling guide 44 of the first stand 46 a continuous wire .or. Feineisenstrasse arrives.

Outside the pusher furnace 10 is at a distance from the side wall 12 of a motor 50 via a Gear 52 and a longitudinal shaft 54 driven billet pusher arranged. The propshaft 54 is coupled to a push rod 56 and 58 at both ends. The push rods 56 and 58 can be moved by means of the gears 59, which convert the rotary movement of the shaft into a Converts linear movement in a plane lying perpendicular to the side wall 12 of the furnace. A traverse 16 is rigidly connected to the push rods 56, 58 and has a plurality of adjacent ones in a row Plungers 52 which are guided horizontally in bearings 54. Each tappet 52 protrudes through a its cross-section corresponding opening 66 in the side wall 12 into the furnace interior.

According to the invention, the plungers 62 each have different lengths, the length of the Push rods, starting from the center of the side wall 12, in the direction of the end walls 16, 18 on both sides increases. Accordingly, the free ends 68 of the outermost plunger 62 are in the largest Distance from the inside 67 of the side wall 12, so that one of the free ends 68 of the tappet sleeve 62 connecting line has an arcuate curvature.

As can be seen from FIG. 2 results, the hearth 40 of the pusher furnace 10 has a concave shape so that its Middle part 70 is lower than its two end walls 16 and 18 adjacent side parts 72 and 74. The free end of the ejector 36 presses the end 76 of the billet 22 and pushes it through the outlet opening 42 into the roller guide 44 of the roll stand 46.

Before actuation of the plunger 62 by the billet pusher 48, the free ends 68 of the The plunger is at a greater or lesser distance from the side wall 12 (FIG. 3). The cold sticks will introduced into the furnace by the ram 24 in such a way that they are at a distance from the side wall 12 come. As soon as the motor 50 rotates the longitudinal shaft 54 via the transmission 52 and thus the bumpers 56, 58 given a transverse movement, the plungers 62 are moved via the cross member 60 at the same time so that while the cold billet is moved in the direction of transport of the furnace. Meet in the process the outermost plunger 62 first on the stick, so that this during its movement is curved at right angles to the longitudinal axis of the furnace.

In this way, all the cold billets entering the furnace are made equal by the ram 62 Curved wisely and at the same time the billets in front of them moved forward in the transport direction.

As a result of the concave curvature of the furnace hearth 40, each billet 22 is curved downwards, so that its ends 76 and 78 are higher than its central part. The ejector 36 is with the loading device 26 synchronized, so that for each cold billet charged, a heated billet is ejected from the furnace.

After passing through the furnace, the billets have a temperature of around 1100 ° C and tend when the ejector 36 acts on their rear end to curvature in the direction of concave surface. However, when ejected, the billet is pushed in by the weight in the direction of transport The stick behind him prevented from bending. To each stick in closer To maintain contact with one another, the oven range 40 can move from the side wall 12 towards the side wall 14 be inclined (Fig. 3). The force of gravity acting on the billets then acts in the rams 62 against.

The tendency of the billets to move downwards when ejected due to their arched shape to bend, effective resistance is opposed by the concave hearth. To this Manner, any inclination of the cudgel to move in one or the other of its two directions to bend out arcuate curvature, prevented. In addition, there is an undesirable deflection this also prevents the stick from initially bending out of the normal straight line Would have to overcome direction and return to its straight, linear form before either could move upwards or in the opposite direction to its curvature. Thus permitted a device according to the invention with different ram lengths of the billet pushing device and a concave oven hearth

Use of billets over 10 m in length without the risk of bending out during ejection the billet consists of the pusher furnace.

Claims (4)

Patent claims: 1.Procedures for the transport of billets, especially those longer than 10 m, by a pusher furnace, characterized in that the billets (22) during the transverse transport through the furnace interior (40) in an approximately vertical and an approximately horizontal plane are each bent in such a way that that, seen in the direction of transport, the two ends of a stick run ahead of its central part or higher than this. 2. Apparatus for performing the method according to claim 1, on pusher furnace with a Row of, which effect the transverse transport of the billets through the furnace, in their longitudinal axis and retractable plungers, characterized in that the individual plungers (62) different in the row, corresponding to the desired bending of the billets in the horizontal Have lengths. 3. Apparatus for performing the method according to claim 1 and claim 2, characterized in that the furnace hearth is trough-shaped according to the desired bending of the billet in the vertical. 4. Apparatus according to claim 3, characterized in that the furnace hearth, in the direction of the Cross transport of the billet seen, is arranged inclined slightly rising. Considered publications: German Patent Nos. 948 937, 888 407; German interpretative documents No. 1 024 541,
008 764; French patent specification No. 702 084,
150 693; British patent specification number 120 225. 1 sheet of drawings 609 727/311 11.66 © Bundesdruckerei Berlin