A cooled mandrel for winding a band-type product into a coil, including a set of adjacent segments mounted to slide radially on a central shaft and fitted each of a cooling circuit having two orifices, respectively an inlet orifice and an outlet orifice, connected each, by a connection fitting havin
A cooled mandrel for winding a band-type product into a coil, including a set of adjacent segments mounted to slide radially on a central shaft and fitted each of a cooling circuit having two orifices, respectively an inlet orifice and an outlet orifice, connected each, by a connection fitting having a variable length, to a supply or exhaust duct, respectively of a heat exchanging fluid. The linking fittings corresponding to each segment are connected to a distribution part threaded on a lateral face of the shaft, wherein both ducts emerge transversally, respectively of the supply duct and the exhaust duct, which are arranged inside the central shaft.
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The invention claimed is: 1. A cooled mandrel for winding a band product into a coil, comprising a central shaft extending between a rear end connected to rotational driving means round an axis and a front end, a set of adjacent segments mounted to slide radially on said shaft and having curved ext
The invention claimed is: 1. A cooled mandrel for winding a band product into a coil, comprising a central shaft extending between a rear end connected to rotational driving means round an axis and a front end, a set of adjacent segments mounted to slide radially on said shaft and having curved external faces which connect to form a substantially cylindrical winding surface centered on the axis of the central shaft, means for controlling a variation in diameter of the winding surface, by radial sliding of said segments between an expanded position and a retracted position, and means for cooling the surface of each segment by circulating a heat exchanging fluid comprising, for each segment, a cooling circuit arranged inside said segment and having an inlet orifice and an outlet orifice of the heat exchanging fluid connected each, by means of a fitting of variable length, to a fluid supply or exhaust duct, respectively, wherein each fluid supply or exhaust duct, respectively is arranged, at least partially, inside the central shaft and fitted, close to the front end thereof, with a bent portion extending transversally to the longitudinal axis and emerging on a lateral face of said shaft via a supply or exhaust transversal orifice, respectively, which is connected sealingly, by at least one fitting of variable length, to at least one inlet or outlet orifice, respectively, of at least one segment. 2. A winding mandrel according to claim 1, wherein the fittings of variable length linking with the inlet and outlet orifices of each segment are attached to a distribution part in the form of a ring having a concave internal face threaded sealingly on a smooth bearing surface of the lateral face of the central shaft, whereon are provided at least two internal orifices which, in the threaded position of the distribution part, are aligned each with a supply or exhaust transversal orifice, respectively, opening onto said bearing surface of the central shaft, in order to form a substantially watertight connection, and an external face whereon are provided, for each segment, two external orifices, respectively supply and exhaust orifices, associated each to a means for plugging a connection fitting on an inlet or outlet orifice, respectively of the corresponding segment, each external orifice, respectively a supply or exhaust orifice, being connected to an internal orifice, respectively a supply or exhaust orifice, via at least one channel arranged, at least partially, in the distribution part. 3. A winding mandrel according to claim 2, wherein it includes, for each segment, a pair of ducts, respectively supply and exhaust ducts, arranged inside the central shaft and emerging respectively, on the lateral face of the shaft, via a pair of transversal orifices, that each pair of external orifices, respectively supply and exhaust orifices, corresponding to a segment is connected by two channels arranged in the distribution part, to a pair of internal orifices, respectively supply and exhaust orifices, and that the pairs of internal orifices corresponding to the different segments are distributed, along the internal face of the distribution part, similarly to the pairs of transversal orifices on the insertion bearing surface of the shaft, so that, in the threaded position of the distribution part, each internal orifice, respectively the supply or exhaust orifice, lies in the extension of a transversal orifice connected to a duct, respectively the supply or exhaust duct, of the central shaft. 4. A winding mandrel according to claim 3, comprising a number (n) of segments having a radial medial plane (P) and extending between two radial junction planes, said radial planes being distributed in a star form around the axis, wherein the central shaft is fitted with (n) pairs of ducts, respectively supply and exhaust ducts, extending symmetrically on both sides of each radial medial plane P and emerging each into the lateral face of the shaft via a transversal orifice having an axis parallel to said radial medial plane (P) and in that the internal orifices and external orifices of the distribution part are distributed by symmetrical pairs with respect to the radial medial plane (P) of each segment and have axes parallel to said radial medial plane and aligned with the axes of each corresponding pair of transversal orifices of the insertion bearing surface of the central shaft. 5. A winding mandrel according to any one of claims 2, 3 and 4 wherein the lateral face of the central shaft and a mating internal face of the distribution part are in the form of cylinders whereof the revolution is centered on the axis of the central shaft and having the same diameter, within the assembly clearance, and that the distribution part is mounted slidingly on the insertion bearing surface of the shaft with interposition of at least two annular sealing joints, on both sides of the aligned orifices. 6. A winding mandrel according to claim 5, wherein the external face of the distribution part includes a plurality of connection facets, whereof the quantity is equal to the number (n) of segments, fitted each with a pair of external orifices, respectively supply and exhaust orifices, connected to a pair of orifices, respectively inlet and outlet orifices, of the corresponding segment, by a pair of fittings of variable length having each an internal end and an external end attached respectively to a facet of the distribution part and on a connection facet of the segment whereon are provided the inlet and outlet orifices of the fluid. 7. A winding mandrel according to claim 6, wherein the ends, respectively internal and external ends, of the fittings of each pair are attached respectively on the connection facets of the distribution part and of the segment, by two plates forming respectively an internal flange and an external flange. 8. A winding mandrel according to claim 7, wherein the external flange for fastening is each pair of fittings on each segment is attached to an intermediate plate attached itself to the connection facet of the segment by screws engaging from the outside. 9. A winding mandrel according to any one of claims 2, 3 and 4 comprising a number (n) of segments and wherein the central shaft extends between a rear portion connected to means for driving said shaft into rotation round its axis, and a front portion for supporting the segments, wherein the radial sliding of the segments is controlled by a rack-device comprising a tubular sheath mounted to slide axially on the front portion of the central shaft and whereon are arranged at least (n) faces tilted with respect to the axis, co-operating each with a mating tilted face of a corresponding segment, for controlling, respectively, the expansion or the retraction of the mandrel by sliding the sheath between two positions, respectively a retracted position and an extended position, under the action of a control rod mounted slidingly parallel to the axis of the central shaft and prolonged beyond a front end thereof in order to be attached to a linking member with the tubular sheath, extending transversally before the front end of the central shaft. 10. A winding mandrel according to claim 9, wherein the tubular sheath mounted slidingly on the central shaft extends substantially, in its forward position, up to the bearing surface for inserting the distribution part, and is prolonged, beyond the latter, by at least two arms running each between two pairs of connection fittings between the distribution part and both corresponding adjacent segments, each arm being attached, by a front end, to the transversal member linking with the sliding control rod. 11. A winding mandrel according to claim 10, comprising (n) segments surrounding the central shaft, wherein the distribution part comprises (n) watertight connection facets, each of a pair of connection fitting, between which are arranged (n) slipping faces forming each a sliding rest for an arm controlling the tubular sheath. 12. A winding mandrel according to claim 11, wherein the external face of the distribution part has a polygonal shape, the connection facet of the fittings being planar. 13. A winding mandrel according to claim 10, wherein the transversal linking member between the control rod and the sheath is composed of a massive part, fitted with a central recess which, at least in a rear position of the control rod, is mounted on a centering bearing surface, arranged between the front end of the central shaft and the insertion bearing surface of the distribution part. 14. A winding mandrel according to claim 13, wherein, the control rod being mounted slidingly in an axial bore of the central shaft, the central recess of the transversal linking member, is closed towards the front by a bottom whereon is attached the front end of the control rod. 15. A winding mandrel according to claim 14, wherein the linking member is prolonged, towards the front, by a protruding portion forming a axle journal centered on the axis of the central shaft and liable to rest, by means of a bearing, on a fixed portion. 16. A winding mandrel according to claim 9, further comprising a protection cover, attached removably to the linking member and extending towards the rear, in order to cap the assembly thereof. 17. A winding mandrel according to claim 16, wherein each segment is prolonged towards the front by a curved plate having a diameter slightly smaller than that of the cover in order to reach thereinside with a possibility of longitudinal sliding to form a substantially continuous protection. 18. A winding mandrel according to any one of claims 2, 3 and 4, wherein each segment comprises an internal portion supporting means controlling the radial sliding and an external portion in the form of a cylindrical sector, of welded construction and comprising two curved plates, respectively internal and external, spaced apart from one another in order to provide a free space divided, by at least one wall parallel to the axis, into at least two chambers, respectively supply and exhaust chambers, wherein emerge, respectively, an inlet orifice and an outlet orifice of heat exchanging fluid, arranged in the internal plate of the segment, at an end thereof, said chambers being communicated at the other end of the segment. 19. A winding mandrel according to any one of claims 2, 3 and 4, wherein each segment comprises an internal portion supporting means controlling the axial sliding and an external portion in the form of a cylindrical sector, composed of a curved plate in the thickness whereof are provided a plurality of channels parallel to the axis of the mandrel and distributed over the whole surface of the segment in two series, respectively a supply series and an exhaust series, emerging each, at a front end of the segment, into a distribution chamber integral with the segment and fitted with an inlet orifice or an outlet orifice, respectively of the fluid, the channels of both series being connected to one another, at a rear end of the segment, by a common distribution chamber. 20. A winding mandrel according to claim 10, comprising a number (n) of segment and wherein each arm controlling the sliding of the sheath is attached, by a front end, to a rear face of the transversal member linking with the control rod, charactericed in that wherein it includes a circuit for lubrication, at least, tilted faces controlling the sliding of the segments comprising, for each tilted face, at least one grease outlet orifice, situated at the exit of a pipework extending along the sheath and prolonged by a portion along at least one arm controlling the sliding up to a supply orifice placed on the front end of said arm and connected, by fastening the linking member on said arm, on a watertight connection tubing, carried by the linking member, and connected to a pressurised grease infeed means. 21. A winding mandrel according to claim 20, wherein each connection tubing of the lubrication circuit is arranged on a rear face of the linking member, whereon applies the front end of the corresponding control arm of the sheath and is placed at the exit of a conduit extending, at least partially, inside the linking member, up to a grease infeed orifice. 22. A winding mandrel according to claim 21, wherein the control rod is centered on the axis of the mandrel and attached, by a front end on a transversal part forming the linking member with the sheath, wherein the front end of the control rod is fitted with a cylindrical bearing surface which is inserted into a mating bore arranged at the center of the linking member and wherein emerges at least one grease inlet orifice connected by a conduit to the connection tubing carried by the linking member, and that the control rod is fitted with at least one channel extending longitudinally between a rear orifice connected to the grease infeed means and a front orifice arranged on the insertion bearing surface of the control rod, and communicating with the grease inlet orifice emerging into the bore of the linking part, after inserting the control rod therein. 23. A winding mandrel according to claim 22, wherein the bearing surface for inserting the control rod is fitted with at least one groove which, in the inserted position of the control rod, is situated by the grease infeed orifice opening onto the central bore, said groove being surrounded by two annular sealing joints. 24. A winding mandrel according to claim 20 further comprising at least two series of tilted faces controlling the radial displacement, respectively, of each segment, centered on two mean transversal planes spaced apart longitudinally, each segment being associated with a face of each series, wherein the lubrication circuit comprises, for each series of tilted faces, at least one pipework extending along a control arm, from a supply orifice placed on the front end of said arm up to a fork placed at said series of tilted faces, from which said pipework is divided into at least two branches emerging each into an outlet orifice arranged on one of the tilted faces of said series. 25. A winding mandrel according to claim 22, wherein the tilted faces controlling the radial sliding of the segments are distributed into at least two groups associated each a lubrication circuit, that the control rod is fitted with at least two longitudinal channels. emerging each into a groove of the insertion bearing surface, that the central bore of the linking part is fitted with at least two groups of orifices coinciding, in the inserted position, each with a groove of the insertion bearing surface, and connected each to a connection tubing, that and wherein the tubular sheath carries at least two groups of pipeworks associated respectively with said groups of tilted faces, each pipework extending along a control arm, from a supply orifice connected to one of the connection tubings, up to at least one grease outlet orifice emerging into at least one tilted face of the corresponding group, and wherein the mandrel is associated with a centralised lubrication system for controlling the pressurised introduction of grease, alternately, in either duct of the control rod and the lubrication of either group of tilted faces.
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Mazodier Fran.cedilla.ois,FRX ; Rollet Claude,FRX, Coiler spindle for winding a band-type product and its use.
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