MXPA00004538A - Carousel winding reel - Google Patents

Abstract

Carousel winding reel (10) for thin or very thin strip/sheet, up to 0.5 mm, hot rolled and leaving in a continuous strip from a rolling train at speeds of20 metres per second and more, the reel (10) comprising a pair of mandrels (11a, 11b) arranged with their respective axes parallel to each other (12a, 12b) and associated with a structure (13) able to rotate around a longitudinal axis (14) substantially between the axes (12a, 12b), the rotatable structure (13) including a front body side (28a) and a rear body side (28b), the mandrels (11a, 11b) including alternatively a position of winding and a stand-by position, the mandrels (11a, 11b) and the rotatable structure (13) cooperating with respective drive means and with a beam structure (17) attached to the floor, wherein the drive means of the mandrels (11a, 11b) consist of respective motors (15a, 15b) each of which is arranged coaxially with the respective mandrel (11a, 11b) and is positioned between the said body sides (28), the motors (15) including a stator (215) and a rotor (115), the body sides (28) including the seatings (29) of the main bearings (18) of the rotor (115), the stator (215) being connected to at least one body side (28) by anti-torsion means (27).

Description

CARROUSEL EMBACKED REEL FIELD OF THE INVENTION This invention relates to a carrousel reel for hot rolled strip / sheet, as stipulated in the main claim. The winding reel according to the invention is applied to the output of a finishing train in a continuous hot rolling line for thin / thin or very thin sheet, up to 0.5 millimeters, with output speeds that can reach 20 meters per second and more.

BACKGROUND OF THE INVENTION [0002] In the field of flat product lamination, there is an increasingly noticeable tendency on the part of builders to seek solutions for the high efficiency production of thin and ultra-thin laminate material that leaves the finishing train at every speed. older times The thinner the strip, the greater must be the speed at which it leaves the finishing train; This is due to the fact that it is necessary to maintain the rolling temperature and the winding temperature within well-defined fields, both for technological and metallurgical reasons. It is well known that there is a growing demand from users of strip and sheet finished with a thickness of less than 1 millimeter, up to as little as 0.5 to 0.6 millimeters, because these values offer two possibilities: laminate can be eliminated in cold, and the hot rolled product can be used directly, or after curing. This solution uses thicknesses of more than 0.6 millimeters. The rolling passes in the cold rolling mills can be reduced, and also any intermediate heat treatments can be reduced. In this case, thicknesses of less than 0.5 and even as little as 0.1 millimeters are used. The competition between the production companies is linked, not only to the quality of the final product, but also to the speed with which the strip / sheet can be extracted from the finishing train, and rolled over the respective collection elements. The higher the speed, the higher the production. _ _ In the light of the fact that there are increasingly more and more endless milling systems, including in hot rolling mills, it has become evident that one of the main obstacles against obtaining, in a highly efficient and continuous way, of speeds greater than 10 meters per second up to as much as 20 meters per second and more, is the winding of the strip / sheet as it leaves the finishing train. For this purpose, the state of the art has developed a winding reel of the rotating type, which is placed at the exit of the finishing train, and is called a carousel reel. The winding reel includes at least two mandrels that exchange their working position in an alternate and continuous manner, ie the position in which they wind the strip as it leaves the finishing train, and the position in which they wait for the next strip. With this solution, the winding conditions are always the same, regardless of which mandrel the strip is wound on. This does not happen in conventional coilers, where slight differences in performance (which are difficult to compensate, because they have origins that can not be controlled), as well as differences in the trajectory followed by the strip, can cause different winding conditions, which have an effect on the geometric quality of the coil, and on the metallurgical quality of the strip. In the winding cycle of the carousel winding reel, after the strip has started to wind on the first mandrel in the working position, and a desired number of spirals have been rolled up, the spool rotates, and, while that the first mandrel continues and the winding is completed, the second mandrel is placed in the working position while waiting for the next strip.

At this point a cutting element intervenes; This is placed between the finishing train and the entrance to the rewinder reel, and cuts the strip to size with respect to the continuous laminate, and consequently, obtains coils of a finished weight. The carousel winding reel, as is known in the state of the art, therefore, includes a pair of winding mandrels associated with a supporting structure which is governed by a suitable driving mechanism to make it rotate through an arc. at least 180 ° C, with the effect of effecting variations in the position of the mandrels according to the passage of the winding cycle. In the state of the art, the drive mechanisms for the mandrels include complex kinematisms with off-axis motors fixed to the floor that provide movement by means of kinematic chains that include respective transmission gears, or that use transmission systems with a universal joint or similar. Although these proposals of the state of the art are satisfactory for particular and limited applications, they have not proved to be sufficiently efficient in hot rolling mills, where the radiation of the strip can cause thermal deformations of the structure, and where it is necessary start rolling at the same operating speed, something that never happens in cold rolling mills. Moreover, these solutions do not obtain high productivity winding cycles with extremely high output speeds of the strip / sheet from the finishing train, speeds of up to 20 meters per second and more, which current technology can achieve, and with the Even more reduced thickness of the strip, as required by the market. The limitations of the proposals known in the state of the art refer to the resistance to tensions of a mechanical, heat, and electrical nature, given the violent slopes of acceleration / deceleration to which the mandrels are subjected during the preparatory steps to the winding and at the end of the winding. To be more exact, the mandrel is subjected to a high torsional tension due to the axial distance with respect to the motor. Other drawbacks relate to the complexity of arming-disarming, the difficulty of maintenance operations, the premature wear of the most delicate components of the kinematic chain, and other problems. Japanese Patent Number JP-A-61.124478 teaches that each arrow of each mandrel is associated with an electric motor, the solid stator being made with the rotating structure. When extracting the arrow from the mandrel, it operates on. bearings in the rotating structure, it is possible to remove the electric motor once the state of the rotating structure has been disconnected. This teaching is interesting, but there are considerable problems related to the daily maintenance of the mandrel, which is the object of frequent maintenance work, and maintenance that is not routine engine. Moreover, there are problems in configuring the coaxial rotor and stator, and in configuring the coaxial chuck and rotor shaft. European Patent Number EP-A-0, 812, 634, precisely to reduce the typical problems of the Japanese Patent Number JP-A-61, 124478, teaches that the rotating structure must have seats on which the complete electric motors are applied with the enclosures. The enclosure supports the main ball bearings of the rotor, and the assembly structure allows to extract the mandrel, remove the rotor alone, and also with the mandrel, and disarm the enclosure to also remove the stator. This solution is also interesting, but it has drawbacks, such as the greater weight caused by the engine enclosures, the alignment of the main bearings of the rotor, the reduced rigidity of the structure, because the force of stretching of the blade or strip it is supported by the individual enclosure, the connection between the enclosure and the rotating structure when there are continuous vibrations and tensions, the centrifugal force that is discharged on the enclosure and on the fastening elements. The present applicants have designed, tested, and incorporated this invention to overcome the drawbacks of the state of the art, and to achieve other advantages, as will be shown later herein.

COMPENDIUM OF THE INVENTION The invention is stipulated and characterized in the main claim, while the dependent claims describe other characteristics of the invention. The purpose of the invention is to provide a winding reel, specifically designed to coil in hot strip / thin sheet at a high speed, that is, at speeds higher than 10 meters per second to more than 20 meters per second, suitable to ensure high performance, greater torque transmitted, reliability, high productivity, efficiency, low maintenance, and high resistance to mechanical and heat stresses. The winding reel according to the invention has a pair of mandrels that rotate about their own longitudinal axis, and associated with a structure that can rotate about an axis substantially between the axes of the mandrels.

The rotation of the structure during the winding cycle, as in a conventional system, serves to bring the two mandrels alternately from the working position to the standby position, and vice versa, to obtain coils of a finished weight of the strip that leaves the finishing train continuously and at a high speed. The mandrels have respective motors mounted on the longitudinal axis of the mandrel. The motors are of the type with an axial cavity in which the arrow of the related mandrel, connected torsionally, is inserted; they are immediately configured immediately after the rotating structure that supports the mandrels and places them in a circumferential manner. The motors extend symmetrically on one side and the other of the axis of rotation of the rotating structure, which cooperates with the impulse element, which places the structure and rotates it. _ According to the invention, the rotors are supported by bearings that are housed in seats made on both sides of the body of the rotating structure; the sides of the body are placed in front of and behind the rotor, and in contact with it. In this way, it is possible to have a rigid and stable structure. The stator is connected torsionally to one side of the body, for example the front side of the body, or to a bar element connecting the two sides of the body. The seat for the bearings is made in order to cooperate with a lid type element that connects stably with the underlying base attachment element; the lid type element and the underlying base together form one side of the body. This solution maintains a high structural rigidity of the system, and at the same time makes it possible to dismantle both the mandrel and the rotor plus the stator together. According to a variant, the stator is divided in two lengthwise, so that when the stator is opened, that is, by dismantling one of its parts, it is possible to remove the rotor without dismantling the entire stator. The axial position of the motors connected to the respective arrows of the mandrel, and also the proximity to the position of the maximum load, minimizes the forces and mechanical stresses for the transmission of movement, even when there are extremely steep slopes of acceleration / deceleration. In fact, the connection of the motor and the mandrel is extremely compact and torsionally rigid. This solution simplifies and lightens the structure, and makes it extremely easy and quick to maintain or replace any components, or even the mandrel itself.

According to one embodiment of the invention, the means for circumferentially positioning the rotating structure consist of a motor element configured on the axis of rotation of the structure. According to a variant, the circumferential positioning element consists of a motor element with an axis orthogonal to the axis of rotation, and connected to the rotating structure by means of a kinematic chain with beveled gears, or with an endless screw. According to a further variant, the circumferential positioning element consists of a motor element with an axis remaining on a plane parallel to, but misaligned from, the axis of rotation of the structure, and cooperating with the intermediate element for transmit movement.

BRIEF DESCRIPTION OF THE DRAWINGS The attached figures are given as a non-restrictive example, and show two preferred embodiments of the invention as follows: Figure 1 shows a side view of a first embodiment of the carousel winding reel according to the invention. Figure 2 shows a partial cross section of a variant of Figure 1. Figure 3 is a front view from "A" ^ of the variant shown in Figure 1. Figure 4 shows a variant of the axial motor shown in Figure 1.

DETAILED DESCRIPTION OF THE PREFERRED MODE The carousel winding reel 10 for hot winding according to the invention is shown in two possible variants in Figures 1 and 2. The spool 10 has a rotation axis and placement 14, and two mandrels rotary, lia and 11b, including respective longitudinal axes 12a and 12b, and mounted cantilevers with respect to a rotary structure 13. The axis of rotation and positioning 14 is between the two axes 12a and 12b. _ - In accordance with the invention, each chuck lia, 11b is axially associated with a respective drive motor, respectively 15a and 15b. Each pulse motor 15a, 15b consists of a rotor 115 and a stator 215. The stator 215 is made torsionally attached to the rotating structure 13 by an anti-torsion element 27, which is connected to the stator 215 by the connecting element 36. The anti-torsion element 27 can be of the type of bridge, which connects the body sides 28a and 28b of the rotating structure 13, or can be associated with one side of the body 28 or the other. The seats 29a and 29b of the main bearings 18a, 18b are on the sides of the body 28a and 28b. The seats 29 are obtained in a manner substantially orthogonal to the joint plane 34 between the lid-type element 30 and the base 31, the cap-type element 30 being made temporarily solid with the base 31 by the joining element, to form one side of the body 28 or the other. The bearings 18a and 18b cooperate directly with the rotor 115, place it, and support it. In order to remove the motor 15, the first stator 215 must be disconnected from the anti-twist element 27, and then the lid-type elements 30 corresponding to the bearings of a rotor 115 must be dismantled. The rotor 115 has an axial seat 33 suitable to receive the arrow 16 of the mandrel 11, holding it torsionally, but leaving it free to slide axially. The rear hydraulic element 32 axially holds the arrow 16, and gives it the hydraulic and command functions it needs; the rear hydraulic element 32 includes a conventional element for axially holding-detaching the arrow 16, and for providing the necessary services and commands. In the case shown in Figures 1 and 3, the front side of the body 28a is located on rollers 37, and the rotary structure 13 is supported at the rear, by means of a support 38, which supports the arrow connected to the motor 19, which serves to circumferentially position the rotating structure 13, and consequently, the mandrels 11. The position of the motors 15a, 15b on an axis with the respective mandrels Ia, 11b, and directly holding the mandrel arrows 16a, 16b in a position of close proximity, ensures an extremely efficient transmission of movement, resistant to mechanical, heat, and electrical stresses, including violent, in a structure that is easy to maintain and disarm. The motor 19 allows the rotating structure 13 to rotate to carry the mandrels 11b, 11b, in accordance with the winding cycle step, from the winding position to the standby position, and vice versa. The inclusion of the motor 19 coaxial with the axis of rotation of the rotating structure 13, and directly holding the rotation arrow without intermediate elements, to transmit the movement, such as gears, joints, etc., ensures a high resistance to mechanical stresses, and an efficient transmission of movement. Figure 2 shows an example of the quick release / joint elements 21, and the assembly bushings 22 for quick replacement of the chucks 11b, 11b.

Figure 1 shows the vertical support member 23 which supports the reel 20 once the winding is finished, and the related trolley 25 for extracting the reel 20 from the reel. An additional support element may also be included that cooperates with the outer end of the mandrel shaft, and not shown herein; It is used to support the weight of the coil 20 as it is rolled in. the final position. In the variant shown in Figure 2, the motor 19, which causes the rotating structure 13 to rotate, is placed on an axis parallel to, but not coincident with, the longitudinal axis of rotation 14 of the structure itself, and transmits the movement. thereto by means of a transmission gear 24 and a sprocket 26. According to a further variant, the motor 19 has an axis orthogonal to the longitudinal axis 14 of the rotating structure 13. Figure 4 shows a variant of the motor 15 , wherein the stator 215 is in two halves (215a and 215b); the two halves are joined reciprocally, and are placed by means of a connection box 35, also of two halves 35a and 35b. In this case, the anti-torsion element 27 can be placed in any position, for example 127, also in relation to the half-body of the connection box 35.

Claims (3)

1. A reel of thin or very thin carousel winding for strip / sheet up to 0.5 millimeters, hot rolled, and which comes out as a continuous strip from a rolling mill at speeds of 20 meters per second and more, comprising the spool (11 ) a pair of mandrels (11a, 11b) configured with their respective parallels to one another (12a, 12b), and associated with a structure (13) capable of rotating around a longitudinal axis (14) substantially between the axes (12a, 12b), including the rotating structure (13) a front side of the body (28a) and a rear side of the body (28b), including the mandrels (lia, 11b) alternately a coiling position and a waiting position, cooperating the mandrels (lia, 11b) and the rotating structure (13) with the respective impulse elements and with a beam structure (17) attached to the floor, wherein the driving element of the mandrels (lia, 11b) consists of respective motors (15a, 15b), each of which is coaxially configured with the respective mandrel (lia, 11b), and it is placed between the sides of the body (28), the motors (15) including a stator (215) and a rotor (115), the winding reel being characterized in that each of the sides of the body (28) comprises a central base element (31), and two removable lid elements (30) associated therewith, and in that the seats (29) for the main bearings (18) of the rotor (115) of each motor (15a, 15b) are partially made in the central base element (31), and partially in the two removable lid elements (30). The winding reel as in claim 1, characterized in that the rotors (115) include an axial cavity associated with the respective arrow (16) of the mandrel (11), the association being torsionally stable and axially movable. 3. The winding reel as in claim 1 or 2, characterized in that the planes of conjunction (34) of the cover elements (30) with the central base element (31), are substantially parallel between them and with the longitudinal axis The winding reel as in claim 3, characterized in that the joint plane _ (34) divides the seats (29) of the main bearings (18) 1 into two substantially coinciding halves 5. The winding reel as in any claim from 1 to 4 inclusive, characterized in that the drive element of the rotating structure (13) consists of a motor element (19) coaxial with the longitudinal axis of rotation (14) of the rotating structure (13). 6. The winding reel as in any of claims 1 to 4 inclusive, characterized in that the drive element of the rotating structure (13) consists of a motor element (19) configured with its axis parallel to, and aligned from, the longitudinal axis of rotation (14) of the rotating structure (13). The winding reel as in any of claims 1 to 4 inclusive, characterized in that the drive element of the rotating structure (14) consists of a motor element (19) configured with its axis orthogonal to the longitudinal axis of rotation ( 14) of the rotating structure (13).