EP0812634A1 - Carousel coiling apparatus - Google Patents

Abstract

The winder consists of a number of mandrels (21, 21') in a housing turning about a fixed support, each connected to a motor shaft (5) in bearings. Each motor has a rotor (32) and a stator (33) and is mounted in an individual frame so that each mandrel, drive shaft and rotor form an separate assembly which is interchangeable and has an axis lying parallel to that of the support. Each motor and mandrel assembly has a flat base which can be mounted on a corresponding platform on the rotary frame, the base and frame being equipped with engaging centering and fixing elements.

Description

The subject of the invention is a carousel winding machine for winding a product in a strip, usable in particular in a rolling and processing installation for metal strips.

A metal strip production installation includes various equipment, in particular for rolling, leveling, pickling or other treatments. When leaving a part of the installation, the strip must generally be wound in a reel, to be easily transported to another part or any other place of use.

A winding machine is used for this purpose, comprising a mandrel driven in rotation about its axis and on which the strip is wound to form a reel. The mandrel is provided, in a known manner, with retractable expansion means making it possible to evacuate the coil after winding and is generally associated with ancillary devices such as, for example, a belt wrapper facilitating the start of winding, and means evacuation of the wound coils.

In certain sophisticated installations, in particular those which work in continuous flow, such as coupled rolling mills or lines, it is necessary to have output equipment specially adapted to large production capacities.

In particular, as soon as a reel has reached the desired dimensions, the strip must be sheared and immediately engaged on another reel. A strip accumulator makes it possible not to stop the rolling during the change of winder, but it is obviously necessary that the time required is as short as possible.

Usually, such an installation therefore comprises two independent winders each having a belt wrapper and a reel discharge carriage. The passage of the product, after shearing, from one winder to another, is ensured by a referral system. Such an arrangement is very bulky and expensive, in particular because of the infrastructure costs which it requires.

To reduce the size of the winding installation, it has already been proposed to use, in place of the two independent winders, a single device comprising two winding mandrels mounted on a rotating frame in the shape of a drum, mounted to rotate around a central axis, each mandrel being fixed in cantilever on a drive shaft rotatably mounted on the drum around an axis parallel to the central axis thereof.

It is thus possible to successively place one or the other of the mandrels in the position for winding the strip, by simple rotation of the drum around its axis (DE-A-3346219, JP-A-61-124478).

Such a so-called "carousel" winder requires only a single wrapper and a single reel evacuation cart, which significantly reduces infrastructure costs. Furthermore, the geometry of engagement of the bands being constant, the switching device is no longer necessary.

However, to allow the positioning of one or the other of the mandrels and the separate control of the rotation of the mandrel being in the winding position, existing installations of this type are of relatively great mechanical complexity and require , in particular, to numerous pinions, drive shafts, bearings, clutches, dogs, etc.

To simplify the mechanical arrangements, it has also been proposed, in document JP-A-61.124478, to associate with each mandrel an electric motor, comprising a rotor rotating inside a stator, the latter being fixed on the drum. and the rotor being secured in rotation with the drive shaft of the mandrel.

In this way, each drive motor of a mandrel must simply be connected to a source of electrical energy, by a supply circuit which can advantageously pass through the central rotation shaft of the drum, the selective control of the rotation of one or the other of the mandrels thus being carried out easily.

Such an arrangement therefore makes it possible to eliminate the drive mechanisms of the two mandrels by replacing them with autonomous motors. However, the entire device remains quite heavy and bulky and there is a risk of overheating of the electric motors placed inside the drum.

The subject of the invention is a new arrangement which is particularly simple and light, which also makes it possible to considerably simplify the positioning of the mandrels and the maintenance of the drive assembly.

The invention therefore applies, in general, to a carousel winder for winding a product in strip on one or the other of at least two winding mandrels, comprising a frame rotary mounted rotary on a fixed support around a central axis, at least two winding mandrels fixed in cantilever, each in the extension of a rotation shaft rotatably mounted on two spaced bearings carried by the rotating frame and defining an axis d winding of the mandrel parallel to and offset from the central axis of the frame, at least two motors each associated with a mandrel and each comprising a rotor and a stator fixed in rotation, respectively, on the mandrel shaft and on the rotating frame and centered on the winding axis, means for controlling the rotation of the frame around its axis for the selective positioning of one or other of the mandrels in the winding position and means for supplying energy to each motor for driving the corresponding mandrel.

According to the invention, each motor associated with a mandrel is mounted in an independent chassis on which are mounted the stator of the motor and the two centering bearings of the rotation shaft carrying the rotor and the mandrel, and the rotating frame is provided with at least two support members, each of a motor-mandrel assembly comprising a mandrel, its rotation shaft and the associated motor, each support member being associated with removable means for centering and fixing the chassis d 'Such a motor-mandrel assembly in a position for which the winding axis defined by the bearings is parallel to the central axis, each motor-mandrel assembly thus constituting an interchangeable module.

In a preferred embodiment, the chassis of each motor-mandrel assembly comprises a substantially flat base capable of being applied to a corresponding platform provided on the rotating frame and constituting the support member of the motor-mandrel assembly corresponding, said base and said platform being provided with combined centering and removable fixing members from one to the other. In particular, the rotating frame advantageously comprises at least two attachment platforms, each of a motor-mandrel assembly, which are placed symmetrically on either side of a shaft pivotally mounted on the fixed support and defining the central axis of the frame.

Preferably, the central shaft is provided, at its end turned on the side where the mandrels are placed, with a rotating support flange on which is formed a circular track resting on at least two separated rollers, the other end of the central shaft being centered in a bearing mounted on a fixed support, the relative levels of the two rollers and of the bearing being determined so that the axis of the central shaft is substantially horizontal.

According to another particularly advantageous characteristic, the support flange is provided with at least two notches each associated with a support member and each having a width at least sufficient for the passage of a mandrel when fitting an assembly motor-mandrel on said support member and the circular support ring comprises at least two fixed sectors formed on the support flange between said notches and at least two mobile sectors each formed on the chassis of a motor-mandrel assembly, said fixed and mobile sectors having the same radius of curvature so as to reconstitute a continuous circular support track after the installation of the motor-mandrel assemblies on the corresponding support members.

The chassis of the motor-mandrel assembly must, of course, be sufficiently reinforced to hold the stator, the rotation shaft and the cantilevered mandrel so as to constitute a rigid carcass capable of participating in the resistance of the whole.

Preferably, each rotation shaft can be provided with a short centering cone allowing rapid disassembly and reassembly of the mandrel and allowing the use of mandrels of different diameters and different technologies.

On the other hand, the rotor of the motor can advantageously be hooped on a sheath which is threaded on the rotation shaft and secured to it by splines for the transmission of the engine torque. However, in certain applications, the rotor can be hooped directly on the rotation shaft.

Other advantageous features are the subject of specific claims.

However, the invention will be better understood from the following description of certain particular embodiments, given by way of example and shown in the accompanying drawings.

Figure 1 is a side view of the assembly of a winder according to the invention, with partial removal of the mandrels.

Figure 2 is a view of the rear of the winder, in section along line II-II of Figure 1.

Figure 3 is a top view of the winder.

Figure 4 is a longitudinal sectional view along the line IV-IV of Figure 2.

Figure 5 is a longitudinal sectional view with partial disassembly of the mandrels or motors.

Figure 6 is a front view, along arrow VI of Figure 1.

Figures 7, 8 and 9 show the rotating frame, respectively in axial section, in top view and in front view.

Figure 10 is a detail view, in axial section, of another embodiment of a motor-mandrel assembly.

Figure 11 is a front view of the chassis of a motor-mandrel assembly.

In Figures 1 and 2, there is shown, respectively in side view and in rear view, the assembly of a winding installation according to the invention comprising a rotating frame 1 rotatably mounted around an axis 10 , normally horizontal, and carrying, in the example shown, two motor-mandrel assemblies 2, 2 ′ which are fixed to the rotary frame 1, symmetrically on either side of the axis of rotation 10.

Each motor-mandrel assembly 2, 2 'comprises a motor 3, 3' for rotating a shaft 5, 5 ', centered on an axis 20, 20' parallel to the central axis 10 of the frame and on which is mounted cantilever a mandrel which has been shown partially in Figure 1.

As shown in Figures 7, 8 and 9, the rotating frame 1 forms a mechanically welded assembly comprising a tubular shaft 11 fixed, at one of its ends, on a flange 13 perpendicular to the axis 10 of the shaft 11, and two plates 12, 12 ', parallel to each other and to the axis 10, welded to the flange 13 and to the central shaft 11, respectively along two diametrically opposite generatrices. Each plate 12, 12 'forms a support platform for a motor-mandrel assembly 2, 2' carrying a mandrel 21, 21 'which extends in overhang on the opposite side, passing through an opening in the flange 13.

On the side of the winding, the frame 1 is supported on two separated rollers 41, 41 'rotatably mounted around horizontal axes on a fixed support 4, by means of a circular bearing track 14 formed on the periphery flange 13.

At its opposite end, the central shaft 11 is carried by a bearing 42 mounted on a fixed base 43 formed on the foundation, and whose axis is placed at the desired level relative to the rollers 41, 41 'so that the axis 10 of the central shaft 11 is substantially horizontal.

Along the support track 14 is fixed a ring gear 44 on which meshes a pinion 41 'attached to one of the support rollers 41 and driven in rotation by an auxiliary motor 45 which thus controls the pivoting of the frame 1 around the axis 10 for the establishment of one or the other of the mandrels 21, 21 ′ in the winding position.

To maintain the frame 1 in each of these two angular positions, the flange 13 is provided with two diametrically opposite stops 18 cooperating with a removable locking member 46 consisting, for example, of two articulated jaws 46 mounted on the fixed support 4 and actuated by cylinders.

However, in the preferred embodiment shown in the figures, the flange 13 comprises, two walls 13a, 13b welded to the plates 12, 12 ', perpendicular to the axis 10 and forming two circular segments spaced apart, each limited towards the inside by a straight edge 15 and towards the outside by a circular edge 16, so as to provide two large notches A1, A2 in the flange 13. The stops 18 for blocking the frame 1 each advantageously consist of two plates welded to the gussets 17 and projecting from track 14.

Each segment-shaped wall 13a, 13b is reinforced by ribs and the rigidity of the assembly is ensured by four triangular or trapezoidal gussets 17 each extending in the extension of a plate 12, 12 ', on both sides and d 'other of it, and welded, respectively on the walls 13a, 13b.

The tube 11, the two plates 12, 12 'and the two segments 13a, 13b thus form a rigid carcass of mechanically welded steel comprising two compartments A1, A2 with rectangular section each limited by a plate 12, 12' and by the edges rectilinear 15a, 15b perpendicular to the latter of the two parts and in which can integrate the two motor-mandrel assemblies 2, 2 '.

As can be seen, in particular in FIG. 10, each motor-mandrel assembly 2 comprises a rotation shaft 5 on which the mandrel 21 is fixed in cantilever and which is rotated by a motor 3 placed in a chassis rigid 6 in the form of a cage comprising a cylindrical side wall 61 on which is fixed the stator 31 of the motor 3 and two flanges, respectively front 62 and rear 63. The rotor 32 of the motor 3 is fixed on the rotation shaft 5 which is carried by two bearings 51, 52 mounted respectively in circular orifices centered on the axis 20 of the assembly and formed respectively on the two 62, 63 of the chassis 6. The assembly forms a carcass strong enough to ensure the maintenance, in service, of the shaft 5 carrying the mandrel 21, the side wall 61 being itself reinforced by radiating ribs 64.

On the other hand, the two front 62 and rear 63 flanges of the chassis 6 are provided, respectively, with rectilinear sides 621, 631 placed in the same plane parallel to the axis 20, which define a flat base for the chassis 6, capable to be applied to one of the platforms 12, 12 ′ when the motor-mandrel assembly is placed in the corresponding compartment A1, A2, as shown in particular in FIGS. 4 and 5.

The chassis 6 of each motor-mandrel 2 2 'assembly can be removably attached to the corresponding platform 12, 12' simply by four bolts allowing rapid assembly and disassembly.

In this way, each motor-mandrel assembly comprising a chassis 6 carrying the motor 3, its rotation shaft 5 with these two bearings and, optionally, a mandrel 21 fixed at the end of the shaft constitutes an interchangeable winding module which can be mounted indifferently in one or other of the compartments A1, A2 of the central frame 1 which is perfectly symmetrical.

In the preferred example shown in the figures, the bolts 7 for fixing the chassis 6 are fixed to the four angles of each support platform 12, 12 ′ and extend vertically so as to engage in corresponding bores 71 formed at the base of the two flanges 62, 63 of the chassis 6, symmetrically on either side of the median plane passing through the axis 20.

As shown in Figure 2, the rear flange 63 is simply provided with an enlarged base so that the bolts 7 engaging in the bores 71 formed at its two ends open to the outside to allow the installation of nuts tightening 72.

On the other hand, the front flange 62 shown in FIG. 11 comprises two lateral sides 623 perpendicular to the lower side 621 and in which notches 65 are formed.

At least over part of their height, for example above the notches 65, the lateral sides 623, 623 ′ are spaced a distance slightly greater than the distance between the edges 15a, 15b of the two segments and are provided of grooves 66 which engage on said segments to ensure the centering of the chassis and its attachment to the flange 13 during the installation of the chassis 6 on the platform 12. The heads of the bolts 7 open into the notches 65 to allow the tightening of the bolts 72.

Preferably, the fixing platform 12 is provided, on the side opposite the mandrels, with a central stud 18 placed in the median plane passing through the axis 10 and which engages in a corresponding bore in the rear flange 63 of the chassis 6 to guarantee the centering of the latter on the plate 12 in a position for which the axis 20 of the mandrel 21 and of the rotation shaft 5 is strictly parallel to the central axis 10 of the rotating frame 1 in the position of work of the motor-mandrel assembly.

Furthermore, the upper side 622 of the front flange 62 opposite the base 621 has a circular profile of the same radius as the external edges 16a, 16b of the two segments 13a, 13b, so as to reconstitute a circular flange after the installation of the frames 6, 6 'in the openings A1, A2.

The support track 14 is therefore formed of four parts, respectively two fixed parts 14a, 14b and two movable parts 14c, 14'c each consisting of a curved profile in the form of a circular sector and fixed respectively along the external sides 16a , 16b of the two segments 13a, 13b and on the curved side 622 of the chassis 6 of each motor-mandrel assembly 2, 2 '. Said fixed and movable parts are connected tangentially to produce a continuous circular track 14 after the installation and fixing of the frames 6, 6 'of the two motor-mandrel assemblies 2, 2' on the platforms 12, 12 'of the frame 1.

Similarly, the ring gear 44 is divided into two fixed sectors 44a, 44b and two mobile sectors 44c, 44'c fixed respectively along the four corresponding parts of the circular track 14 so as to be placed in the extension of each other to reconstitute a circular crown 44 meshing with the pinion 41 '.

It should be noted the lightness and great simplicity of the central frame 1 in mechanically welded construction which, after blocking the bolts 7 forms a compact assembly with the chassis 6 of, 6 ′, the latter simply in front be sufficiently reinforced so as to constitute a carcass, sufficiently resistant to participate in the rigidity of the assembly.

As indicated above, each motor-mandrel assembly forms an interchangeable module which can be disassembled as a block and transported to the workshop for maintenance.

However, according to other advantageous arrangements of the invention, each motor-mandrel assembly is produced in a way allowing easy disassembly of the different parts, either in the workshop or directly on the winder, as shown schematically on the Figures 4 and 5 which are views in longitudinal section through an axial plane showing the assembly of the winder and the methods of disassembly of certain parts.

Each mandrel 21, which may be of known type, is provided at its base with a fixing plate 22 extended by a centering cone 23 which can engage in a corresponding conical recess 53 of the rotation shaft 5, which has a flared end so as to constitute a flange 54 on which is applied the fixing plate 22 of the mandrel, the assembly being secured, in a conventional manner, by screws.

Keys 26 which engage in corresponding grooves of the conical recess 53 secure the rotation of the centering cone 23 with the rotation shaft 5.

In a conventional manner, the shaft 5 is provided with an axial bore through which passes a rod 24 for controlling the operations of the mandrel, actuated by a control mechanism 25 fixed on the rear end of the shaft 5.

The centering cone 23 advantageously has a length which is small enough so that the corresponding conical space 53 of the shaft 5 extends only over a length of the latter corresponding substantially inside the front bearing 51 so as not to reduce the resistance of the central part of the shaft 5 carrying the rotor 32 of the motor 3.

In the case of Figures 4 and 5, where the mandrel 21 is fixed by the plate 22 on a flange 54, the latter blocks the front bearing 51 which, if necessary, must therefore be removed from the rear. This is why, the rotor 32 of the motor is hooped on a tubular sleeve 33 which is threaded on the central part of the shaft 5. Splines 34 are formed on the sleeve 33 to engage in corresponding grooves of the shaft 5 so as to secure the rotation 32 of the rotor 32 with the shaft 5.

Furthermore, the front bearing 51 is housed in an orifice made in the front flange 62, the diameter of which must be slightly greater than the diameter of the rotor 32 to allow passage of the latter.

Thus, it is possible to disassemble from the front, for maintenance, the assembly of the shaft 5 carrying the rotor 32, the front bearing 51 and the mandrel 21, the chassis 6 remaining fixed on the frame 1 with the stator 31 as shown in Figure 5.

However, as shown for the lower assembly 2 ′, it is also possible to leave in the chassis 6 the assembly of the motor 3 and of the shaft 5, by simply removing the mandrel 21 ′, for example for replace it with a mandrel of another type or another dimension.

The winder which has been shown in Figures 4 and 5 is suitable for winding very thin products, for example tin.

However, thanks to the use of interchangeable modules, the installation can be adapted to the winding of more resistant products, for example thin steel sheets, without modifying the supporting frame 1, the mounting of each motor-mandrel assembly being simply adapted to the forces to be collected for the winding.

In particular, in order not to excessively reduce the cross section of the central part of the shaft 5, the rotor 32 can be shrunk directly onto the shaft as shown in FIG. 10.

In this case, the bearing 51 must be dismantled from the front and the mandrel fixing flange is formed on a separate ring 55 fixed by screws on the front end of the shaft 5.

However, other characteristics of the invention shown in the drawings have particular advantages.

For example, the use of a tube 11 to constitute the central shaft of the rotating frame 1 makes it possible to pass inside this tube the electric cables for power supply and for controlling the motors 3, 3 ′ as well. that the hydraulic fluid passage pipes for the control of expansion and shrinking of the mandrels and the lubrication of the bearings, which can be assembled on the rear end of the central shaft 11 and connected to means for supplying fluid by a rotary joint 27.

Likewise, the electric cables supplying the motors 3 are connected to a manifold 35 disposed at the rear end of the shaft 11, in the axis of the hydraulic connector 26.

In this regard, it should be noted that one can advantageously use asynchronous motors for driving the mandrels. In this way, in fact, no supply is to be provided for the rotors which, as we have seen, are fixed on the rotation shaft of each assembly and disassemble therewith.

If the internal cross section of the tubular shaft 11 is sufficient, this can be used for forced ventilation of the motors, the ventilation air being forced into the central tube 11 and passing into corresponding orifices provided in the tube 11, the fixing plate 12 and the wall 61 of the chassis for cooling the engine by evacuating through an annular space formed between the front flange 62 and the corresponding end of the side wall 61 which is connected to the front flange by gussets 65 placed in the extension of the ribs 64.

However, in the embodiment shown in the figures, ventilation is ensured by an annular box 8 connected by sheaths 81 to the casings of the two motors, as shown in Figures 3, 4 and 5, the central tubular shaft 11 is simply used for the passage of the electrical supply cables connected to the manifold 35 and the hydraulic pipes connected to the rotary connector 26.

The ventilation box 8, which is fixed in rotation is limited by a tubular side wall 82 and two flanges 83, 84 each provided with a central orifice for passage of the shaft 11.

The rear flange 83 is integral with the wall 82 and associated with a sliding joint 83 ′ ensuring sealing with the shaft 11.

The front flange 84 is fixed on the shaft 11 and therefore rotates with the latter. This is why it is provided, on its periphery, with an annular seal 84 'applied against the wall 82 to ensure sealing.

The box 8 has a ventilation circuit opening into an orifice 80 formed on the rear flange 83 or the side wall 82.

On the front flange 84, which rotates with the shaft 11, two diametrically opposite orifices are formed on which two sheaths 85, 85 ′ are connected, opening into two lateral boxes 86, 86 ′ fixed respectively on the platforms 12, 12 ′, on either side of the central axis 10 and each provided with two branches which open at the base of the two compartments A1, A2 into which the chassis 6 of the two motor-mandrel assemblies are threaded.

Each branch 86 is provided with a curved outlet end 87 on which the chassis 6 of a motor-mandrel assembly is applied, during the laying of the latter, and which opens into an orifice 88 formed in the tubular wall 61, for example between two ribs 64.

The air introduced under pressure into the annular box 8 is thus discharged inside the chassis 6 of the engine and escapes through the annular space 65 formed between the external wall 61 and the front flange 62 of the chassis 6.

Of course, the invention is not limited to the details of the embodiments which have just been described by way of simple example, and which could be the subject of variants, without departing from the protective framework defined by the claims. .

For example, if the use of asynchronous motors for controlling the rotation of the mandrels of electric motors makes it possible to simplify the feeding, other types of motor could also be employed. Moreover, these motors could also be powered by hydraulic or pneumatic energy as soon as the power necessary for winding can be obtained.

In addition, it is particularly advantageous to fix each motor-mandrel assembly on a simple platform by means of four bolts, but the support members of the motor-reduction units could, however, be produced in another way.

In addition, it would be possible, if necessary, to make a winder carrying more than two motor-mandrel assemblies, the rotating frame being able, for example, to be provided with three platforms angularly offset by 120 °.

Similarly, other arrangements could be envisaged for the mounting of the motor, in particular the production of the rotation shaft and the bearings, the fixing of the mandrel and its control system, any type of mandrel which can be used.

The reference signs inserted after the technical characteristics mentioned in the claims, have the sole purpose of facilitating the understanding of the latter, and in no way limit their scope.

Claims (20)

Carousel winder for winding a strip product on one or the other of at least two winding mandrels, comprising a rotating frame (1) rotatably mounted on a fixed support (4) around a central axis (10), at least two winding mandrels (21) fixed in cantilever, each in the extension of a rotation shaft (5) rotatably mounted on two spaced bearings (51,52) carried by the rotating frame (1) and defining a winding axis (20) of the mandrel parallel to the central axis (10) of the frame (1) and eccentric relative to the latter, and at least two motors (3) each associated with a mandrel (21) and each comprising a rotor (32) and a stator (33) centered on the winding axis (20), means (44) for controlling the rotation of the frame (1) around of its axis (10) for the selective positioning of one or the other of the mandrels in the winding position and of the means (35) of energy supply to each motor (3) for driving the mandrel (21) corresponding, characterized in that each motor (3) associated with a mandrel (21) is mounted in an individual chassis (6) on which are mounted the stator (31) of the motor (3) and the two centering bearings of the 'rotation shaft (5), so that each mandrel (2), its rotation shaft (3) and the associated motor constitute an independent motor-mandrel assembly (2) and that the rotating frame is provided with at least two support members, each of such a motor-mandrel assembly (2, 2 ') each associated with removable means for centering and fixing the chassis (6), in a position for which the winding axis (20 ) defined by the bearings (51, 52) is parallel to the central axis (10), each motor-mandrel assembly thus constituting an interchangeable module. Winder according to claim 1, characterized in that the chassis (6) of each motor-mandrel assembly (2) comprises a base (62), (631) substantially flat capable of being applied to a corresponding platform (12) formed on the rotating frame (11) and constituting the support member of the corresponding motor-mandrel assembly, said base (621, 631) and said platform (12) being provided with conjugated members (73, 74, 7, 71 ) centering and removable fixing of one on the other. Winder according to claim 2, characterized in that the rotating frame (1) comprises a central shaft (11) pivotally mounted on the fixed support (4) around an axis (40) and on which at least two are rigidly fixed platforms (12, 12 ') placed symmetrically on either side of said central shaft (11) and each constituting a support member for a motor-mandrel assembly (2, 2'). Winder according to one of the preceding claims, characterized in that the rotary frame (1) comprises at least one flange (13) fixed to one end of the central shaft (11) perpendicular to it and on which is formed a circular support track (14) centered on the axis (10) of the shaft (11) and rolling on at least two separated rollers (41) rotatably mounted on the fixed support (4) each around an axis parallel to the central axis (10) of the frame (1). Winder according to claim 4, characterized in that the central shaft (11) is associated with a single rotating support flange (13) fixed on one of the ends turned towards the side of the mandrels, and the other end being carried by a bearing (42) mounted on a fixed support (43) spaced at a level such that the axis (10) of the shaft (11) is horizontal. Winder according to one of claims 4 and 5, characterized in that the support flange (13) is provided with at least two notches (A1, A2) each associated with a support member (12) and each having a width at least sufficient for the passage of a mandrel (21) when installing a motor-mandrel assembly (2) on said support member (12) and that the circular support track (14) comprises at at least two fixed sectors (14a, 14b) formed on two parts (13a, 13b) of the support flange and extending between said notches (A1, A2) and at least two mobile sectors (14c, 14'c) each provided on the chassis (6) of a motor-mandrel assembly (2), said fixed and mobile sectors having the same radius of curvature so as to reconstitute a continuous circular track after the installation of the motor-mandrel assemblies (2, 2 ') on the corresponding support members (12, 12 '). Winder according to claim 6, characterized in that the rotating frame (1) comprises two parallel plates (12, 12 ') fixed on either side of the central shaft (11) and each forming a fixing platform d '' a frame (6) of a motor-mandrel assembly (2, 2 '), that the support flange (13) comprises two spaced apart parts (13a, 13b) in the form of circular segments, each having a circular outer edge (16a, 16b) on which is provided a fixed sector (14a, 14b) of the support track (14) and an internal edge (15a, 15b) perpendicular to the two parallel platforms (12, 12 ') and that the chassis (6) of each motor-mandrel assembly (2, 2 ') comprises, on the side of the mandrel (21), a flange (62) limited by two parallel edges (623, 623 ') perpendicular to the base (621) of the flange (62) and whose spacing corresponds, apart from play, to the width of the notch (A1, A2 ) between the parallel internal edges of the two support segments of the flange (13), the parallel edges (623, 623 ') of the flange (62) of each motor (6) being provided with grooves (66), capable of s' slidingly engage on the corresponding internal edges (15a, 15b) of the two segments (13a, 13b) when installing a motor-mandrel assembly (2) on the corresponding platform (12) of the frame (1). Winder according to claim 7, characterized in that each platform (12, 12 ') is provided with a centering member (73) cooperating with a conjugate member formed on the rear flange (63) of each motor (6) for centering the motor-mandrel assembly (2) on the platform (12) in a position for which the axis (20) of the rotation shaft (15) is strictly parallel to the axis (10) of the frame (1). Winder according to one of the preceding claims, characterized in that each mandrel (21) is provided with a fixing plate (22) capable of being applied to a flange (54, 55) formed at the front end of the rotation shaft (5). Winder according to claim 9, characterized in that the flange (54) consists of a flared part formed on the corresponding end of the rotation shaft (5). Winder according to claim 9, characterized in that the flange (54) consists of an annular piece removably attached to the corresponding end of the rotation shaft (5). Winder according to one of the preceding claims, characterized in that each mandrel (21) is provided, at one end for fixing on the rotation shaft (5), with a conical centering part (23) capable of s '' engage in a corresponding conical recess (53) of the rotation shaft (5) and extending over a sufficiently short length so that the conical recess (53) covers substantially the same length as the corresponding bearing (51) of the shaft (5), conjugate members (26) for securing in rotation being interposed between said centering part (23) and the conical recess (53). Winder according to one of the preceding claims, characterized in that the rotor (32) of the motor (3) is shrunk onto a tubular sleeve (33) capable of being threaded onto the rotation shaft (5) and provided with splines (34) cooperating with corresponding grooves of the shaft (5) for securing the latter in rotation with the sleeve (33) and the rotor (32). Winder according to one of claims 1 to 12, characterized in that the rotor (32) is hooped directly on the rotation shaft (5). Winder according to one of the preceding claims, characterized in that the central shaft (11) of the frame (1) consists of a tube in which are arranged the power supply circuits of the motors (3, 3 ' ) and the mandrel control (21, 21 '). Winder according to one of the preceding claims, characterized in that the chassis (6) of the motor (3) forms a rigid carcass comprising a front flange (62) and a rear flange (63) respectively carrying the two bearings (51, 52) of the rotation shaft (5) and connected by a tubular wall (61) provided with reinforcement fins (64) and on which the stator (31) of the motor (3) is fixed. Winder according to claim 16, characterized in that the front bearing (51) of the shaft (5) turned towards the side of the mandrel (21) is housed in an opening in the front flange (62) of the chassis (6) and having a diameter slightly greater than that of the rotor (32) to allow the mold 5 to be removed from the block with said rotor (32) passing through said orifice. Winder according to claim 16, characterized in that a space (65) is left between one of the flanges (62) of the chassis and the corresponding end of the tubular wall (61), at least over part of the periphery thereof, to allow the evacuation of cooling air introduced into the interior of said chassis (6) through at least one inlet orifice (88) formed in said tubular wall (61) and capable of being connected , when fitting the chassis (6) on a circuit (87) carried by the frame (1) and into which is cooled cooling air. Winder according to claims 15 and 18, characterized in that, when the chassis (6) is placed on the frame (1), the inlet orifice (88) is applied to the on a corresponding orifice formed on the 'central tubular shaft (11) of the frame (1) and inside which is discharged the cooling air. Winder according to claim 18, characterized in that the frame (1) is associated with an annular box (8) surrounding an end of the central shaft (11) opposite the support flange (13) and comprising a fixed part (82, 83) provided with a pressure air inlet orifice (80) and a movable part (84) fixed on the central shaft (11), with interposition of sliding seals (83 ', 84') between the fixed and mobile parts and that said mobile part (84) is provided with at least one outlet orifice to which is connected at least one sheath (85, 86) carried by the frame (1) and having an outlet end (87) on which the air inlet orifice (88) of the frame (6) is applied to the placing the latter on the frame (1).

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