DE1508885A1 - Device for continuous casting, in particular of metals - Google Patents

Description

PATENT LAWYERS

dr. w. Schalk dipl-ing. Peter Wirth 1 508885

DIPL.-ING.G. E. M. DANNENBERG · DR. V. SCHMIED-KOWARZIK

•FRANKFURT AM MAIN

CR ESCHINHEIMEII PCS. 39

June 15, 1966 Oasis 64t 527

PW / Lu / H

Koppers Company, Inc. Pittsburgh, Pa, 19, USA

Device for continuous casting, in particular of metals

The invention relates to the continuous casting of metals and more particularly to an improved method and method Device for regulating or »regulating the shape of a loop that forms a continuously cast strand.

In the continuous casting of metals and especially steel flows molten metal from a ladle first into a tundish (Tundish) and then into a vertically arranged casting mold, which is usually owed or in a vertical position and is moved around so that the cast strand does not touch the Walls of the form fixes. At the beginning of the casting process, the The bottom of the mold is temporarily closed with a sprue (cold strand) to which the cast strand adheres. Afterward the sprue and thus also the cast strand is pulled out of the mold. When the cast strand is down out of shape emerges, its solidified skin "or outer surface is thick enough to that exerted from the inside by the metal above

to withstand and to withstand a deformation by conventional strand support devices. _e The sprue runs through a group of pinch rollers, from which it is pulled out of the mold together with the cast strand hanging from it.

After passing through the pinch rollers, the cast strand is from separated from the sprue and guided in an arc to and through a number of light rollers which are deeper than the Kleraiarolls are appropriate.

The speed of rotation of the pinch rollers determines the speed with which the cast strand is withdrawn from the mold. The withdrawal speed, in turn, is related to the casting speed of the metal matched so that the riad mirror of the molten Metal can be held in the mold at a predetermined height. To the height of the Badspiegela in the casting mold more precisely Regain or to be able to regulate, a common liquid level indicator or other suitable device can be used.

Appropriately, the speed of the "iiiclitwalzen se matched to that of the pinch rollers Cfeynchronisieri ^ that the strand forms a predetermined, uniformly shaped loop which generally describes an arc of a circle. However, it is difficult to maintain an arch with the desired hadius, and there is a great risk that cracks and fine hoisting of the strand will occur or that the strand will even break when the loop

too tight or too small.

The pinch rollers exert a slight pressure aua, bo on the strand that cal change its dimensions and the strand emerging from the pinch rollers is longer than that between the pinch rollers imported strand. Therefore, the straightening rollers usually have to rotate a little faster than the pinch rollers. The relationship between the speed of the straightening rollers and that of the pinch rollers is influenced by many factors, e.g. by: Changes in the height of the bath level in the casting mold! Changes of the metallic river due to the different altitudes of the Casting mold and due to the flow properties of the molten Metal; Changes in length of the metal strand as a result of cooling

of metal and the like. Nevertheless, there is in everyone eyes or Relationship looks a certain relationship / between the speeds of the straightening rollers and the pinch rollers to achieve the desired sheet shape to adhere to the loop! this relationship between the speeds is referred to as "synchronism" in the present application «

According to the invention, the speeds of the pinch rollers and the straightening rollers are now in a device for continuous casting of metals coordinated with each other and a continuously cast strand is pulled out of the casting mold by means of the clamping rollers, then bent and guided between the straightening rollers, which bend the cast strand straight and then discharge it in a practically horizontal direction, whereby a sensing element is provided,

BATH ORIGINAL

8QS846 / Q22I

veLohes touches the strand and the shape of this between The curved loop formed by the pinch rollers and the straightening rollers is determined and the straightening rollers then regulate or regulate accordingly, to maintain the desired radius of the arc. In one embodiment of the invention, a lever is provided, which is pivotably arranged in the vicinity of the loop formed by the strand. One end of the lever is in constant position sliding contact with an outer surface of the strand in order to control or regulate the speed of the straightening rolls in this way. so that when the arch shape changes, the sole formed by the continuously cast strand, e.g. because the pinch rollers and the straightening rollers are not synchronized with each other run, the lever is pivoted and electrically operated a speed control device. This will increase the speed the straightening rollers are regulated according to the changes in the loop shape, so that the loop of the cast strand resumes its predetermined initial shape and the straightening rollers run synchronously with the pinch rollers again *

The invention is explained in more detail below with reference to the drawing, for example, which shows a schematic side view of an embodiment of the invention with a schematic representation of the electrical control or regulating maintenance.

A typical device 11 for continuous casting is shown of metals, which has a tundish 13 from which an uninterrupted stream of molten

9098U / Q222

Metal 15 flows into the upper, open end of a water-cooled casting mold 17. molten metal a cast strand 19, which is continuous is withdrawn from the other end of the mold. A customary sprue or Kaitatrang (not shown) or the like is used for casting on. used, v / ie described above.

The cast strand 1.9 is withdrawn from the casting mold and arrives then to a conventional support device 21 comprising rollers or hollows, which is arranged directly below the bottom of the mold is. The outer surfaces or the skin of the strand 19 is with Cooled water that exits from conventional spray nozzles 23, which are expediently between the individual roller groups of the support device 21 are arranged. The continuous withdrawal of the strand 19 can take place in any suitable manner. With this one As shown in the example shown, the strand 19 is drawn off by means of pinch rollers or rollers 25, which are driven by an electric motor 27 will.

At a suitable distance from the pinch rollers? 25 and below this runs the strand 19 through the rollers of a subliohen straightening device 29, which in the present case has an upper roller 31 and lower rollers 33. Usually the straightener is 29 laterally offset to a vertical axis running between the pinch rollers, as the drawing shows, and the strand 19 leads in the form of a bow or a soleplate from the pinch rollers 25 to the straightening rollers 29 »The straightening device 29 is driven in the usual way by an electric motor 35.

bad original 90884670222

In conventional systems, the rotor 27 that drives the pinch rollers 25 determines the take-off speed of a strand, and the speed of the pinch roller motor is adjusted in accordance with the level of the bath level of the molten metal in the casting mold by means of a conventional lying device 28 for the The level of the bath level of the molten metal is regulated. For this purpose, for example, a liquid level detector operating with gamma rays can be used, which usually has two gamma ray detectors arranged at a distance from one another, which are directed at the casting mold and move up and down with it in order to detect fluctuations in the height of the bath level detect molten metal in the casting mold and electronically regulate the amount of molten metal that is poured into the casting mold in the unit of time. In this way, the speed of the pinch rollers and the speed at which the casting is drawn off are directly influenced by the amount of metal poured into the mold per unit of time.

The devices and devices described above are known. The strand 19 forms a "loop" in the form of an arc of a circle (usually a quadrant) which extends between the output side of the pinch rollers 25 and the input side of the high device 29. A typical loop can have a radius of about 4.90 m , but the loop radius can vary depending on the equipment used, and each individual continuous caster enables the production of

9 0 9 a 4 _6/0 2 2 2 BAD

curved strands each with an individual normal Radius of curvature.

It is generally convenient to have the radius of the loop on a predetermined \ 7ert, e.g. to about 4 »90 m». Yfenn As the radius of curvature of the loop becomes larger, the strand is said to take the form of a "tight loop" {if against it As the radius of curvature of the loop becomes smaller, the strand takes on the shape of a "loose loop".

In order to avoid a loose or a tight loop, it was previously necessary for the operating personnel of the continuous casting plant to readjust the speed of the straightening device by hand from time to time in order to match this speed more precisely to the speed of the pinch rollers eighth, that the string loop was still not too tight, too loose. therefore, the operator tried to adjust the speed of the leveling rolls by hand to make it as with that synchronize the pinch rollers to ^"11 · However, since ee as previously mentioned, are numerous factors affecting the casting speed (amount of metal per unit of time), it was almost impossible for the operator to always let the straightening rollers and the pinch rollers run "synchronously".

According to the invention, however, it is now possible to solve this synchronization problem simply and effectively in that the

909846/0222

Speed of the straightening rolls depending on the shape of the sole of the strand regulated and thereby one with the clamping rollers synchronous run is guaranteed.

As shown in the drawing, the device or the sensing element for plotting the shape of the strand loop comprises an elongated mill arm or lever 45 ¹ EUf which is pivotably attached at 45 'to a holder 47 which is located near the cast strand 19 The lever 43 'is attached and arranged in such a way that its one end 49', as a rule and according to the drawing, the right end, slides with constant slight friction over the outer surface of the bent strand 19. A counterweight 51ι which is in a suitable manner on the can be attached to the other end of the lever 43 'feet, for example welded, enables the lever 43' to be held in pivotable, sliding contact with the surface of the string 19 in a simple manner.

Near the counterweight 51, a bracket 53 is attached to the underside of the lever 43 'approximately at the position shown, and a End of a connecting rod 54 is pivotally connected by means of a pin to the bracket 53, while the other end of this Rod is attached to one end of a roller chain 55.

At a suitable distance from the lever 43 'and below it, a further support device with a platform 59 is provided, on which a conventional device 61 for generating electrical signals is arranged, here as a differential transformer,

909846/0222

BATH ORIGINAL

60 is formed with a movable core 62. The output signal of the "transformer is placed on a potentiometer 39 and" changes ε calibrate according to the displacement of the core 62 from a liull- or middle position. The device 61 for generating the;

Signals is provided with a sprocket 63 to which the Roller chain 55 is guided around below and then runs upwards and over a loosely entrained sprocket 65 $ the sprocket is stored in a suitable manner on the platform 59.

The free end of the roller chain 55 depends on the loosely entrained Chain wheel 65 from downwards into a tubular guide 67, which is attached to the platform 59 and from this naoh below protrudes. The tubular guide 67 is closed at its lower end, preferably by means of a screwed-on cover plate 69.

In the tubular guide 67 there is a cylindrical one Counterweight 71 attached to the free end of the downwardly hanging roller chain 55 More attached to the counterweight Arm 73 protrudes through an elongated slot 74 in the wall of the tubular guide 67 and has a at its end Contactor 75 on. This contactor 75 interacts with awei electrical switches 77 and 79 B, which are attached to the support device 59 at a vertical distance from one another, When the sprocket 63 rotates and the counterweight 71 in the tubular guide 67 is calibrated near the top. moved near the bottom, In this way the contactor 75 comes with one of the switches

90984670222

BAD ORIGlNM-

77 and 79 in contact and turns on the te meet switch.

As can be seen from the drawing, whenever the loop formed by the strand 19 changes from its normal quarter-circle shape deviates, the lever 43 'is pivoted about its pivot point 45', since the counterweight 51 the end 49 of the lever 45 'in constant sliding contact with the loop holds, without consideration on the shape of the loop. For example, when the loop becomes loose, end 49 'rotates clockwise the roller chain 55 runs counterclockwise around the sprocket 63 and the counterweight 71 about the pivot point 45 ′ moves up in guide 67. When the sprocket 63 rotates, the core 62 moves out of its central position to the transformer winding so that an electrical signal is generated. The transformer 60 is preferably designed in such a way that that it does not emit an output signal when the core closes in its normal center position. Furthermore, the transformer 60 a small area (a so-called dead zone) on both sides of the zero position in which no signal is generated. He generates a positive output signal when the core is on the one side of that dead zone and a negative output when it is on the other side.

As shown in the drawing, the motor 35 is used by a conventional one Servo amplifier 36 corresponding to those starting from a signal chain Signals controlled; The signal chain includes signals

909846/0222 ORIGINAL BATHROOM

a potentiometer 37 from a tachometer driven by the motor 35 (Tachometer generator) 38 | the signal at the potentiometer 39 from Different ialtransformat οι * 60 | ittid signals either from a potentiometer 41> which the output signal from a with the tachometer (tachogenerator) 42 connected to the motor 27, or from a potentiometer 43 "which receives a reference or comparison signal from a corresponding source" The size of the Signal at potentiometer 43 and thus also the speed of the motor 35 depends on the position of a sliding contact 44, which is set by hand by means of an adjusting knob 45. Depending on the position of an arm 46, the motor 35 is either from Motor 27 or regulated or controlled by the reference signal source 43. The speedometer 42 is mechanically connected to the motor 27 in the usual manner

If the speed of the motor 27 increases, so will the signal at the potentiometer 41 and thus also the signal fed to the amplifier are greater. Accordingly, the engine 35 runs at greater speed until the signal from tachometer 38 cancels the signal from tachometer 42. The relationship between the speed of the motor 35 and the speed of the motor 27 can be adjusted by adjusting a sliding contact 49 of the potentiometer 37 can be easily adjusted or changed with the aid of a button 50. On the other hand, if the arm 46 is the one the contacts touches, so the constant signal on the potentiometer 43 is fed to the amplifier 36, the motor 35 runs with it constant speed so that the output of the tachometer

BATH ORIGINAL

909046/0222

A.

the reference signal cancels. Regardless of whether the engine is now 35 the motor 27 follows or whether the motor 35 with a predetermined Speed is driven, the speed of the motor is according to the invention in each pail as a function of the shape of the Strand 19 formed loop regulated or corrected and the curvature of the loop kept constant in this way. to For this purpose, the potentiometer 3 · naoh measure of the deviation of the curvature of the loop formed by the strand 19 from a predetermined or previously set arc shape generates a correction signal.

If now when pouring the screed from your normal or prescribed Deviates arc shape, the feeler arm 43 'speaks

909846/0222 bad omginal

this change and is pivoted about its center of gravity 45 '. Then the roller chain 55 rotates the sprocket 63 and the output signal of the transformer 60 is changed. This change in the output signal either becomes that of the motor 27 (by means of of the saohometer 42) or the reference provided by the signal generator 43 * signal is added to or subtracted from it, and duroh the increase or decrease of the output signal, the speed of the for driving the straightening device serving motor 35 either increased or decreased © that the loop returns to its normal form is traced back.

For example, if the sight is rolling in relation to the pinch rollers run too fast, the loop becomes too "tight". The output signal from the signal generating device 43 then becomes negative and the speed of the motor 35 for the straightening rolls is reduced. The loop then loosens and resumes its normal position Shape.

It has already been mentioned that the straightening rolls are somewhat faster as the pinch rollers run when the speed of the rioht rollers is matched to that of the pinch rollers. With the help of the speed setting device 45 »50 for the straightening rolls its speed can be set manually, advantageously within the limits of minus 10 to plus 25 percent of the speed of the pinch rollers.

As soon as the system is put into operation and then the The beginning of the strand 19 has emerged from the pinch rollers

the upper calibration roller 31 is raised so that the strand 19 between the rollers 31 and 33 can arrive. When the upper roller 31 is raised, it opens a roller entry limit switch 87, whose open position is shown in dashed lines in the drawing.

After the strand 19 has entered the calibration device 29, The upper roller is lowered again in the usual way and the roller entry limiting so-holder 87 is closed; the closed one Position is shown in solid lines in the drawing. The two limiting so-holders 77 and 79 are normally open. Of the The upper limit holder 77 is connected to an electrical power supply 101 via a heater E2, the lower limit switch 79 is also connected to the power supply 101 and is also in series with the roller entry limit switch 87 and a Heiais El.

With the limit switch 79 for the upper value are on Alarm horn 103 and a contact or switching element El-3 of the Eelais El connected in parallel. There is a contact parallel to contact HI-3 t or switching element R2-1 of relay H2.

If now the loop deviates from its normal shape and becomes "tight", the feeler arm or lever 43 'pivots counterclockwise its pivot point 45 'and the contactor 75 actuates the lower one Limit switch 79 and closes it. It will Eelais El is connected to voltage and its contact El-I is open,

9 O 9 8 A 6 / O 2 2 2. _v BAD ORIGINAL

whereupon the contact IH is separated from voltage. Duroh that When the contact Ml is switched off, a contact Ml-I opens in the circle of the Riohtwalzenmotor 35 and thereby holds the straightening device 29 at. At the same time, the contact Rl-3 in the circle for the alarm horn 103 is closed and an alarm signal sounds.

Although the straightening rollers are stopped at this moment, the pinch rollers continue to run. The strand 19 continues from the The pinch rollers off and the loop loosens and returns to its normal shape. As soon as the loop starts to get loose, the feeler arm pivots 4-3 'clockwise and that Counterweight 71 moves up in guide 67. The arm 73 and contactor 75 also move up and down release the lower limit so-holder 79, which is opened in the process. The relay Rl is again separated from the voltage and the Contact Ml applied to voltage, the contact Ml-I being closed. When contact Ml-I is closed, current flows in the straightening roller motor 35, which then starts the straightening device 29 again, so that the strand 19 continues through the continuous casting device 11 can run.

If a loose loop occurs instead of a tight loop, the feeler arm pivots clockwise about pivot point 45 ^f and arm 73 lifts contactor 75 until it comes into contact with upper limit switch 77 and this flow flows. As a result, the relay R1 is energized, its contact R1-I is closed and the alarm horn 103 sounds.

909846/0222 ORIGINAL BATHROOM

When the loop is to be released, the operating personnel is made aware of the sounding of the alarm horn and can use the track system Manually control "until the cause leading to the formation of a loose loop has been eliminated 1st

Also in the so-called Soalt Diagram is a device provided for switching off the alarm signal, which consists of a manually operated push-button device with a push-button holder 105 and the associated relays and contacts or switching elements. Assume that the signal 103 sounds because the loop is closed is tight or too loose; then the operator first manually presses the push button switch 105, whereby the relay RJ is energized and is switched to permanent voltage by closing its contact R3-1 (self-suspension). With each of the in question Coming loop forms the contact Rl-2 or the contact R2-2 is already closed beforehand if either the relay Rl or the relay R2 was connected to voltage, as already mentioned before. Thus, by manually operating the pressure, it s 105 that Horn 103 silenced

Manual shutdown is advisable for various reasons of the alarm horn. First, the operator becomes aware of incorrect operation of the casting plant Secondly, the operating personnel press the push button 105 by hand to switch off the alarm signal! and finally, the operator must operate the caster if necessary operate manually and eliminate the causes that triggered the alarm signal

909846 / Q222 bad OBiQiNAL

.. Horraalweie · the feeler arm is constantly in contact with the strand. Contact! Deviations from the predetermined shape of the sole will be detected by the sensor arm, whereupon the signal generator in the ■ is switched on manner described above, so that the straightening rollers and the pinch rollers run synchronously again.

From the drawing it can be seen that close to the pivot point 45 'a Ansohlag 107 is provided. This stop is used to limit the counterclockwise movement of the lever and prevents the counterweight 71 from striking against the screwed-on de-icing plate 69 and possibly damaging it. if For example, the loop is extremely tight, the lever 43 'rotates counterclockwise so far that the counterweight 71 almost reaches the bottom of the tubular guide 67. At the same time, the contactor 75 touches the lower switch and the lever almost comes into contact with the soleplate. As already mentioned, when the lower entrance switch is pressed and closed 79 the straightening rollers stopped. The pinch rollers run however, continue and pull the casting or the strand out of the mold so that the loop returns to its normal shape. After expiration After a predetermined period of time, the straightening rollers are restarted and then again with the pinch rollers synchronized or matched to this.

In another embodiment of the invention, the sensing element or the feeler arm 43 'also by another scanning device

909846/022

that does not touch the strand, e.g. a phdboelectric cell, gamma rays or another with Radiation damping working device suitable. It goes without saying that each of these scanning devices is associated with the signal generating device 61 connected, which are then blamed in4 # r " Way works to regulate the speed of the Riohtwalzen.

The person skilled in the art recognizes that the device according to the invention is too Adjusting the loop shape easily and in a simple manner to automatically regulate and control the shape of a loop formed by a curved, continuously cast strand can be used or modified or adapted. This device for adjusting the loop shape can form an integral part of the continuous casting plant, so that it does not What is more necessary is that the operating staff constantly adjusts or readjusts the speed of the straightening rolls in order to adjust the straightening rolls to run synchronously with the pinch rollers. In addition, the device according to the invention is much more effective and more powerful than the previously customary and manually operated devices for adjusting the sole loop shape and maintaining it the synchronous operation of the straightening rollers and pinch rollers.

BATH ORIGINAL 909848/0222

Claims (11)

Koppers Company, Inc. Pittsburg, Pa., USA Oasis 64: 527 Patent claims ) Gate direction for continuous casting, preferably of metals, with (e.g. by an electric motor) drivable pinch rollers for pulling the cast strand from a casting mold and with a drive (e.g. electric motor) that is separate from the drive of the pinch rollers for straightening the cast S-fcrang, the runs in a loop, preferably in a circular arc, from the pinch rollers to the straightening rollers, characterized by sensing or sonic scanning devices (43 *) which respond to changes in the shape of the loop of the strand (19), and by devices (36j 37, 38j 39i 61 j 4.1 »42, 27 or 43) for regulating the speed of the straightening rollers, (31,33)» whereby the sensing or scanning devices and the control devices connecting or connecting to one another. Are transfer means (54 »55,63) arranged and formed so that the sensing or Abtasteinriohtungen asynchronous with respect to the clamping rollers (25) or not matched running the Riohtwalzen and upon a change of the adjustable or predetermined F _o rm of the Strangsohleife Activate the control devices for the straightening rollers in such a way that the straightening rollers are again adjusted to the speed of the pinch rollers in the specified manner or run synchronously with the pinch rollers. 2. Apparatus according to claim 1, characterized in that the sensing device has a pivotably mounted sensing arm (43 ') which is held with its one end (49 ¹ ) *, for example by means of a counterweight (51) arranged at its other end, in constant contact with the bent strand (19) and around the Changes in the curved or "sole loop shape of the strand corresponding angles about its pivot axis (45 ¹ ) can be pivoted. 3. Apparatus according to claim 1, characterized in that the scanning device (43 ¹ , 45 ', 51) is a device operating with rays, for example gamma rays, and preferably with a photocell. 4 · Device according to claim 1, characterized in that the control devices (36 | 37, 38f 39, 6lj 41, 42, 27 or 43) for the calibration rollers (31, 33) a signal generating device (61) connected to a power source, preferably one differential transformers provided with a movable core (62) (60, and reference signal generating means (27, 42 | 43 | 37, 49). 5, device according to one of the preceding claims, characterized in that the connecting or transmission means, which connect the sensing device (sensing arm 43 ^f ) with the signal generating device (differential transformer 60, 62) of the control devices, have a transmission link (sprocket 63) which on the one hand with the feeler arm (43 *) and 9098 * 6/0222 _B ad original on the other hand with the movable core (62) of the differential transformer or 8 (6O ^ is in operative connection in such a way that the changes in the loop shape of the strand (19) corresponding deflections of the sensor arm (43 ') into corresponding displacements of the transformer core (62) with respect to the magnetic field of the transformer (60) and in corresponding generated thereby electrical correction signals can be translated, the correction signals either to the value of a predetermined or adjustable reference signal added or subtracted from this and the speed of the drive motor (35) of the straightening rollers (31, 33) in accordance with the sum or difference correction signal thus obtained is increased or decreased until the straightening rollers (31, 33) run synchronously with the pinch rollers (25) again or the speed of the straightening rollers is matched to the speed of the pinch rollers » 6. Device naol> one of the preceding claims, characterized characterized in that one with the drive motor (35) of the straightening rollers (31, 33) operatively connected potentiometer "(37» '49 »50) is provided, by means of which the speed of the Straightening roller drive motor (35) to any ratio to the speed of the drive motor (27) of the pinch rollers (25), preferably to one between the limit values minus $ 10 and plus 2556 the ratio of the speed of the pinch rollers, is optionally adjustable. 7. Device according to one of claims 4 to 6, characterized in that that the signal generating device (61) a has limited responsiveness, and one of the or Abtaateinrichtung (4-3 ', 45', 51) or the connection ■ or transmission means (54 »55, 63) such controlled (by means of 71, 73» 75) limit switch (79) is provided, that when the predetermined response range of the signal generating device is exceeded when the loop of the strand (19) is stretched too much ("tight loop"), del? · Drive motor (35) of the straightening rollers (31, 33), preferably by means of a switching contact (MI-I) actuated by a relay (R 1), is switched off. 8. Apparatus according to claim 7, characterized in that the Circuits assigned to the limiting so-holder (79) contain an acoustic alarm device (103) which can be actuated by the latter, by means of which an alarm signal is triggered if the loop of the cast strand (19) is stretched too much, ("tight loop"). 9 · Device for continuous casting, preferably of metals, with (e.g. by an electric motor) drivable pinch rollers for Withdrawal of the cast strand from a casting mold and with a drive separate from the drive of the clamping rollers (e.g. Electric motor) having straightening rollers for straightening the cast strand, which is in a loop, preferably in an arc from the pinch rollers to the straightening rollers, preferably according to one of claims 1 to 8, characterized by a pivotable on a first carrier (47) BATH ORIGINAL 909846/0222 attached sensor arm (43 ¹ ) »which with one end (49 ^f ) touches the. loop-shaped bent strand (19)} on the» mill arm (43 ¹ ) engaging means (51), the leg, the ■ strand touching end (49 ' ) keep in constant contact with the strand loop a signal-emitting device arranged on a second carrier (59) connection or transmission means (54, 55, 63) # the linriohtuns between the feeler arm (43 ') and the signals emitting form an operative connection in such a way that they activate the signal-emitting device in accordance with deviations of the strand sole from a predetermined or adjustable loop shape} by means of two normally open limit switches (77, 79) arranged at a distance from one another on the second carrier (59) )} through a. with the IPühlerarm (43 *) in operative connection stationary contact element (75) which is with one of the two limit switches (77 and 79) in switching division engageable when the Pühlerarm is deflected over a predetermined or _e adjustable angle addition} with by a an electrical energy source and with the signal-emitting device in operative connection transformer (60, 62} that the voltage of the signal-emitting device is lower than the voltage of the energy source} a normally energized first switching element, which is within the circuit of the energy source with the drive motor (35) of the straightening rollers (31,33) is connected} an alarm horn (103), which via a normally BATH ORIGINAL 9098 ^ 6/0222 open second switching element connected to the energy source Tension-lying first link via a normally Vtferbinden sohlossent's third link with the energy source «and Connection means that connect the normally open first delimitation bracket to the energy source via a first contact connect, whereby the first “Eelais” is the normally closed third Sohaltgüeä operated so that when the loop det . The strand deviates from its specified # the set shape and if 4tr feelseram according to this deviation is pivoted enough »around the normally open Close the first switch, the first heat on voltage placed and the normally closed third switching element is opened, whereupon the normally tensioned first holding member is disconnected from tension, eo that the circuit «Wipe the generator and the straightening roller drive motor open and dt * straightening rolls are stopped, with the same Moment the normally open second hold-open link is closed and the alarm horn sounds. 10. Apparatus according to claim 9, characterized in that devices for restarting the straightening rollers (31, 33) are provided, and that these devices have means, which open the closed first switch, which is normally open, again after the strand solenoid receives its from the given I ^ rm deviating £ orm has changed, whereby the The first relay is disconnected from the voltage, the first sohalt member 9098 ^ 8/0222 8AD ORiGiMAL voltage is applied and the current in the circuit between the generator and the straightening rolls flows again, so that the drive motor of the straightening rolls starts up again, 11. The device according to claim 9jdaduroh characterized in that Connection means are provided which the alarm horn (103) via a normally open fourth relay with the Connect energy source, and that further · connection means are provided that the »wide normally open So holder via a wide »Selai» al "! De? Connect intrgieauelle, which is normally open · fourth · fielai · actuated, whereby, if 41 · Strangsohleit · given by their · », baw, β ing "et hurried form deviates, and when the -hühlerarm (43 ') according to this deviation far enough swings and the normally open "wide Sehalt · * aohliess, dft ·" wide Ralaia put on tension, the fourth contact geaohloiaen and the alarm horn rings out an alarm signal. ■ ' 12. Device according to claim 11, characterized in that means for interrupting an alarm signal detected by the alarm horn (103) are provided which have a push-button switch (105) which is connected via a third relay to the energy source, which furthermore have a fifth switching element, which is parallel to the pushbutton switch between the poles of the power source, and which have a sixth Sohaltglied, which is in series with the third relay, that when the pushbutton _{switch is closed, the third H 6} IaIs connected to voltage and the BATH ORIGSMAL 909846/0222 fifth contact; is closed, the sixth switching element is closed when the first heat is applied. 13o device according to claim 11, characterized in that Means for interrupting an alarm signal generated by the alarm horn (IO3) are provided, the 'a push-button switch (105), which is connected via a third relay to the energy source, which is also connected to a fifth Have a holding link that is parallel to the push-button switch awisohen the poles of the energy source, and which have a seventh switching element) so in series with the third relay is, if when closing the pushbutton switch * (105) iaa third relay is connected to voltage and the fifth contact gate is closed, the seventh Sohalt member is closed when the second relay is on Tension is applied. The patent attorney BATH 909846/0222