WO2023223544A1 - Winding device, mandrel replacement method, and mandrel - Google Patents

Abstract

A winding device 1 comprises: a mandrel 3 including a winding drum composed of a combination of segments 30; a casing 51 in which the mandrel 3 is mounted; a holding cylinder 53, between the casing 51 and the mandrel 3, that holds the mandrel 3 and rotates coaxially with the mandrel 3; and an expanding/contracting mechanism 20 that changes an outer diameter of the winding drum 30. The mandrel 3 is integrated with the expanding/contacting mechanism 20 and configured to be insertable into and removable from the holding drum 53 in the axial direction thereof.

Description

Winding device, mandrel replacement method, and mandrel

The present disclosure relates to an apparatus for winding a metal strip.

For example, a metal strip obtained through hot rolling and cold rolling is wound up with a winding device called a carousel reel, and is transported, stored, etc. in the form of a coil. In this winding device, a mandrel is directly involved in winding up the metal strip. In the mandrel, a winding drum is constituted by, for example, a plurality of members called segments, and the metal strip is wound onto the winding drum made up of a combination of these segments.

There is, for example, Patent Document 1 as a conventional technique for changing the outer diameter of a winding drum by expanding or contracting a plurality of segments of a winding device. Further, as a conventional technique for removing a mandrel during maintenance of a rotary table coiler for winding a metal strip, there is, for example, Patent Document 2.

Korean Patent No. 102200891 Patent No. 3902292

Mandrel segments have a shorter replacement cycle, for example, 2 to 3 years, compared to other mandrel components, due to wear due to contact with metal strips, surface roughness reduction, etc. Therefore, the mandrel is required to be easily replaceable for maintenance.
However, in the mandrel disclosed in Patent Document 1, it is understood that the main shaft can only be removed when the main shaft that supports the segments is separated from the fluid pressure cylinder that expands or contracts (expands and contracts) the winding drum, which is made up of segments. be done. Therefore, in the winding device disclosed in Patent Document 1, it is not easy to remove and replace the mandrel including the cylinder.
Further, in Patent Document 2, it is necessary to remove the device behind the mandrel (inner side) and then remove the mandrel, so it is necessary to remove the device prior to removing the mandrel. Therefore, in the winding device disclosed in Patent Document 2, it is not easy to replace the mandrel.

Therefore, an object of the present disclosure is to provide a winding device equipped with a mandrel that is easy to replace.

The winding device of the present disclosure includes a mandrel that rotates around an axis and has a winding drum, a casing to which the mandrel is attached, a holder that holds the mandrel between the casing and the mandrel, and that rotates coaxially with the mandrel. It includes a cylinder and an expansion/contraction mechanism that changes the outer diameter of the mandrel.
The mandrel in the present disclosure is integrated with the expansion/contraction mechanism and is configured to be insertable into and removed from the holding cylinder in its axial direction.

In the winding device of the present disclosure, the mandrel preferably has a main shaft that rotates coaxially with the winding drum and extends in the axial direction, and a rod that moves in the axial direction to expand or expand the outer diameter of the winding drum. and a hydraulic cylinder for contraction. In this expansion/contraction mechanism, preferably, the hydraulic cylinder including the rod has a radial dimension that falls within the range of the outer diameter of the main shaft.
According to this winding device, when replacing the mandrel, the fluid pressure cylinder and rod can be removed together with the mandrel while avoiding interference with the holding cylinder, so the mandrel can be easily replaced in a short time. .

In the winding device of the present disclosure, preferably, the fluid pressure cylinder including the rod is provided inside the main shaft.
Also in this winding device, when replacing the mandrel, the fluid pressure cylinder and rod can be removed together with the mandrel without interfering with the holding cylinder, so the mandrel can be easily replaced in a short time.

In the winding device of the present disclosure, preferably, a rotational force application section that transmits rotational force from the holding cylinder to the mandrel, and a section provided between the casing and the holding cylinder and on both sides of the rotational force application section in the axial direction are preferably provided. and a set of bearings. The main shaft of the mandrel includes a first shaft portion having a cylindrical appearance at a portion facing the pair of bearings, and is configured such that the outer periphery of the first shaft portion and the inner periphery of the holding cylinder are in contact with each other.
According to this winding device, since the first shaft portion supported by the bearing has a cylindrical appearance, the moment arm against the overturning moment acting on the winding drum of the mandrel becomes longer, and the first shaft portion having a cylindrical shape The reaction force acting on the surface and the surface pressure generated thereby can be reduced. Thereby, the risk of wear and tear such as wear and deformation of the first shaft portion can be significantly reduced.

Preferably, a bush is replaceably fitted to the first shaft portion of the mandrel in the present disclosure at a position facing each of the pair of bearings.
According to this winding device, by periodically replacing the bushing when replacing the mandrel, for example, the first shaft portion is not damaged and the winding device 1 can be maintained at a small maintenance cost. In particular, the part facing the bearing is subject to high loads and is prone to wear and tear, so by making that part a replaceable bush, wear and tear on the mandrel can be reduced and durability can be improved.

Preferably, the rotational force applying part in the present disclosure is a spline in which a plurality of internal teeth provided on the inner periphery of the holding cylinder are engaged with a plurality of external teeth provided on the outer periphery of the first shaft portion of the mandrel. including.
According to this winding device, high transmission torque can be transmitted to the mandrel. In addition, when replacing the mandrel, the inner teeth of the holding cylinder and the external teeth of the first shaft part can be engaged with each other by simply rotating the mandrel slightly in the circumferential direction, so the main shaft can be easily attached to the holding cylinder. . In addition, by adopting a function sharing format in which the bush holds the radial load and the spline transmits torque, the gap between the main shaft and the holding cylinder can be minimized.

The holding cylinder in the present disclosure preferably includes a rotational force receiving portion to which rotational force is transmitted, and the spline is arranged close to the bearing on the winding drum side among the set of bearings.
Since the winding cylinder has considerable weight in addition to the metal strip being wound up, a considerable torsional force is required to rotate the first shaft. This torsional force is applied to the spline, but as the position where the torsional force is applied is far from the winding drum, the torsion angle generated in the second shaft portion where the winding drum is provided becomes large. Therefore, the spline is moved closer to the winding drum to suppress the twist angle. Furthermore, if the spline is provided in a portion of the holding cylinder which will be described later that has a large diameter, the torsional rigidity of that portion will be high. This suppresses torsional stress occurring in the second shaft portion.

In the winding device according to the present disclosure, preferably, support of the mandrel in the axial direction with respect to the holding tube is obtained by fastening a split ring to the holding tube.
According to this winding device, by releasing the fastening of the split-structure fixing ring, the mandrel used for maintenance is released from being restrained in the axial direction, so the mandrel can be easily pulled out from the holding cylinder. Conversely, when holding a new mandrel in the holding cylinder, the mandrel can be attached to the holding cylinder by simply inserting the mandrel into the holding cylinder and fastening the split-structure fixing ring to the holding cylinder.

In the winding device of the present disclosure, if the side from which the mandrel is pulled out is the front and the opposite side is the rear, preferably the first shaft portion of the main shaft has an outer diameter continuously or stepwise from the front to the rear. is configured to be small, and the opening diameter of the accommodation space for the first shaft portion in the holding cylinder is configured to decrease continuously or stepwise from the front to the rear.
According to this winding device, since the outer diameter of the first shaft portion 11 and the opening diameter of the storage space taper toward the rear, it is easy to insert the first shaft portion of the mandrel into the holding cylinder 53. It is.

In the winding device of the present disclosure, assuming that the side from which the mandrel is pulled out is the front and the opposite side is the rear, it is preferable that the end face of the coil made of the metal strip wound around the mandrel be directed backward along the axial direction of the mandrel. Equipped with a coil extraction mechanism that pushes the coil forward from the front.
According to this winding device, when removing the wound coil from the mandrel, the end face of the coil can be pushed from the back to the front along the axial direction of the mandrel, so the coil unwinds and becomes a telescopic shape. It is possible to prevent this from happening.

The present disclosure also provides a mandrel replacement method in which a mandrel that rotates around an axis and has a take-up cylinder is inserted into and removed from a casing in the axial direction. In this replacement method, the mandrel is held between the casing and the mandrel, and the mandrel is inserted into and removed from a holding cylinder that rotates coaxially with the mandrel. The mandrel is integrated with an expansion/contraction mechanism that changes the outer diameter of the winding cylinder, and is configured to be insertable into and removed from the holding cylinder in its axial direction.

According to the winding device of the present disclosure, the expansion/contraction mechanism that changes the outer diameter of the mandrel and the mandrel can be integrally inserted into and removed from the holding cylinder in the axial direction thereof. Therefore, according to the winding device of the present disclosure, when replacing the mandrel, the expansion/contraction mechanism can be removed together with the mandrel, so the mandrel can be easily replaced in a short time.

It is a perspective view showing a winding device concerning an embodiment. It is a front view showing a winding device concerning an embodiment. FIG. 2 is a perspective view showing a single mandrel of the winding device according to the embodiment. 1 is a plan sectional view of a winding device according to an embodiment. 5 is a partially enlarged view of FIG. 4. FIG. 6 is a partially enlarged view of FIG. 5, showing the area around the first shaft portion of the main shaft. FIG. 6 is a partially enlarged view of FIG. 5, showing the area around the second shaft portion of the main shaft. FIG. FIG. 3 is a plan cross-sectional view showing how the mandrel is pulled out in the winding device according to the embodiment. FIG. 3 is a plan view showing a fixing ring for axially supporting the mandrel according to the embodiment.

The present disclosure will be described based on preferred embodiments.
The winding device 1 according to the embodiment includes two mandrels 3A, 3B, and each mandrel 3A, 3B is responsible for expanding or reducing the outer diameter of the winding drum made of a combination of segments 30, that is, expanding or contracting the diameter. It is configured so that it can be inserted and removed integrally with the expansion/contraction mechanism 20. This insertable/removable configuration is realized by providing holding cylinders 53A, 53B as elements of the first rotating mechanism 5 between the first rotating mechanism 5 and the mandrels 3A, 3B. Since the winding device 1 has this insertable/removable structure, the mandrel can be easily replaced in a short time. Hereinafter, after explaining the configuration of the winding device 1, the effects produced by the winding device 1 will be mentioned.

[Components of the winding device 1: see Figures 1, 2, and 4]
The elements constituting the winding device 1 will be explained with reference to FIGS. 1, 2, and 4.
The winding device 1 includes a pair of mandrels 3A and 3B each winding the metal strip SR, and a first rotation mechanism 5 that rotates each of the mandrels 3A and 3B while supporting them in order to wind the metal strip SR. A second rotation mechanism 6 that rotatably supports the first rotation mechanism 5 is provided. The winding device 1 also includes a pair of reducers 7A and 7B that transmit reduced rotational force to the first rotating mechanism 5, and a main drive source that provides rotational force to each of the reducers 7A and 7B. 9A and 9B. In the winding device 1, the rotational force outputted by the main drive sources 9A and 9B is reduced in speed by the reduction gears 7A and 7B, respectively, and is transmitted to the first rotation mechanism 5. The rotational force transmitted to the first rotation mechanism 5 is converted into rotation of the mandrels 3A, 3B necessary for winding up the metal strip SR. The above-mentioned elements of the winding device 1 are made of metal materials that have required properties such as mechanical strength.

In the above, the rotation of the mandrels 3A and 3B was explained together, but in reality, for example, while one mandrel 3A is being rotated to wind up the metal strip SR, the other mandrel 3B is on standby without winding. After the winding by the mandrel 3A is completed, the metal strip SR is then wound by the mandrel 3B. That is, the winding device 1 alternately winds up the metal strip SR using the mandrel 3A and the mandrel 3B.

Note that the front (F) and rear (R) of the winding device 1 are defined as shown in FIG. 1 and the like. That is, in the winding device 1, the side where the mandrels 3A and 3B are provided is called the front (F), and the opposite side where the main drive sources 9A and 9B are provided is called the rear (R). The front (F) corresponds to the side from which the coil CL is removed, and the rear (R) corresponds to the opposite side. However, forward (F) and backward (R) have relative meanings. Further, the length direction (L), width direction (W), and height direction (H) of the winding device 1 are defined as shown in FIG. 1 and the like. The length direction (L) and the width direction (W) are along the horizontal direction, and the height direction (H) is along the vertical direction.

[ Mandrels 3A, 3B: See Figures 3, 5, 6, and 7]
The configuration of the mandrels 3A, 3B will be described with reference to FIGS. 3, 5, 6, and 7. In addition, since the mandrel 3A and the mandrel 3B have the same configuration, hereinafter, both may be collectively referred to as the mandrel 3 and described. In addition, other elements such as the holding tubes 53A and 53B will also be collectively referred to as the holding tube 53 etc. in the following description unless it is necessary to distinguish between them.
The mandrel 3 includes a main shaft 10 that rotates by receiving a rotational force from a first rotation mechanism 5, an expansion/contraction mechanism 20 supported by the main shaft 10 that expands or contracts the diameter of the segments 30, and a plurality of winding mechanisms for winding the metal strip SR. A segment (winding cylinder) 30 is provided.

[Main shaft 10: See Figures 3, 5, and 6]
The main shaft 10 includes a first shaft portion 11 supported by a holding cylinder 53 that is an element of the first rotation mechanism 5, and a second shaft portion 15 that supports the segment 30 in relation to expanding or contracting the diameter of the segment 30. Be prepared. The main shaft 10 includes a locking groove 14 at the boundary between the first shaft portion 11 and the second shaft portion 15 into which a fixing ring 58 for positioning the mandrel 3 in the direction of the axis C with respect to the first rotation mechanism 5 is inserted. ing. Note that the direction of the axis C may be referred to as the axial direction C. The first shaft portion 11 is provided at the rear (R) of the locking groove 14, and the second shaft portion 15 is provided at the front (F) of the locking groove 14. Further, the main shaft 10 is made of a cylindrical member in which a gap is formed around the axis C from the first shaft part 11 to the second shaft part 15. Except for the portion accommodating the fluid pressure cylinder 21, this gap has the same opening diameter from the first shaft portion 11 to the second shaft portion 15. However, the outer diameter of the main shaft 10 is smaller in the second shaft part 15 than in the first shaft part 11. A rod 23 of the expansion/contraction mechanism 20 is inserted into this gap. In addition, the first shaft part 11 and the second shaft part 15 may be constructed as one body from the beginning, or may be constructed as a single body by joining after producing each separately.
The main shaft 10 is fixed so as not to rotate with respect to the holding cylinder 53 which is rotated by the rotational force of the main drive sources 9A and 9B, and rotates together with the holding cylinder 53. This rotation of the main shaft 10 causes the metal strip SR to be wound around the segment 30 provided on the main shaft 10.

[Stepwise variation in the outer diameter of the first shaft portion 11: see FIGS. 5 and 6]
The first shaft portion 11 has an outer diameter that gradually decreases from the front (F) to the rear (R). This is for convenience when removing the previously used mandrel 3 for maintenance and inserting a new mandrel 3. In other words, as shown in FIG. 5 and FIG. ), the outer diameter is set smaller in steps. Corresponding to this variation in the outer diameter of the first shaft portion 11, the opening diameter of the accommodation space AS in which the first shaft portion 11 of the holding cylinder 53 is arranged is gradually changed from the front (F) to the rear (R). is set to a small value. Note that although an example of stepwise reduction of the outer diameter and opening diameter is shown here, continuous reduction of the outer diameter and opening diameter may be adopted. In this way, the outer diameter of the first shaft section 11 is gradually reduced, so that when the first shaft section 11 is attached to the first rotation mechanism 5, the outer peripheral surface of the first shaft section 11 and the holding cylinder 53 A gap is created between the inner circumferential surface of the The portion where this gap occurs is not subject to control of the dimensional tolerance between the first shaft portion 11 and the holding cylinder 53.

[Driver side splines 12A, 12B: see Figures 5 and 6]
The first shaft portion 11 includes a driven spline 12 (12A, 12B) and bushes 13, 16. In FIG. 5, the one corresponding to the mandrel 3A is written as the driven side spline 12A, and the one corresponding to the mandrel 3B is written as the driven side spline 12B, but since the configurations of both are the same, in the following, they will be referred to as the driven spline. It is written as a side spline 12. The notations A and B may be omitted for other components as well.

The driven spline 12 transmits the rotational force from the holding cylinder 53 to the first shaft portion 11 of the main shaft 10. The driven side spline 12 and the active side spline 55 of the holding cylinder 53 constitute an example of the rotational force applying section of the present disclosure by spline fitting. The driven side spline 12 constitutes a plurality of external teeth provided on its outer periphery, and the active side spline 55 constitutes internal teeth provided on its inner periphery. Ideally, sliding in the axial direction C does not occur between the driven side spline 12 and the active side spline 55, so there is no need to consider the lifespan due to wear.

The driven spline 12 is provided adjacent to the bush 13 between the bush 13 and the bush 16 in the direction of the axis C. That is, the spline 12 is provided at a position close to the segment 30 around which the metal strip SR is wound. Since the segment 30 has a considerable weight in addition to the metal strip SR to be wound up, a considerable torsional force is required to rotate the first shaft portion 11. This torsional force is applied to the driven spline 12, but as the position where the torsional force is applied is far from the segment 30, the torsional angle generated in the second shaft portion 15 where the segment 30 is provided increases. Therefore, the spline 12 is brought closer to the segment 30 to suppress the twist angle. Further, since the driven side spline 12 is provided at a portion of the holding cylinder 53 having a large diameter as described later, the torsional rigidity is large. Thereby, the torsional stress generated in the second shaft portion 15 is suppressed. Note that since the bushes 13 and 16 are provided at positions corresponding to the bearings BB1 and BB2, respectively, the spline 12 is arranged close to the bearing BB1 on the side closer to the segment 30.

Although a key and a keyway can be used instead of spline fitting, spline fitting is more advantageous in transmitting large rotational force. In the case of the spline 12 and the driving side spline 55, the number of teeth can be 10 or more, or even 20 or more, depending on the diameter, so that a larger rotational driving force can be transmitted. The large number of teeth facilitates positioning of the teeth of the spline 12 and the teeth of the driving side spline 55 in the circumferential direction when replacing the mandrel 3. For example, if the number of teeth is 12, the teeth of the spline 12 and the driving side spline 55 can be aligned by rotating the spline 12 by a maximum of 15 degrees.
Depending on the cross-sectional shape of the teeth, which are made up of unevenness, splines can be distinguished into square splines and involute splines. Although any form can be applied to this embodiment, an involute spline is advantageous for transmitting a larger rotational force, and it is possible to reduce radial wobbling or even if there is some wobbling. can also rotate smoothly.

[Bushes 13, 16: See Figures 5 and 6]
The bushes 13 and 16 are provided between the first shaft portion 11 and the holding cylinder 53 by being fitted into the first shaft portion 11 of the main shaft 10 . The first shaft portion 11 is provided with bushes 13 and 16 at the front (F) and rear (R), respectively, and the two bushes 13 and 16 ensure that both ends of the first shaft portion 11 are connected to the holding cylinder 53. radially supported.
Since the first shaft portion 11 is not rotatable with respect to the holding cylinder 53, the main shaft 10 cannot rotate relative to the holding cylinder 53 in principle. Since there is a gap in the circumferential direction between the first shaft part 11 and the internal teeth of the first shaft part 11, that is, a backlash in a gear, a slight sliding distance may occur between the first shaft part 11 and the holding cylinder 53. Therefore, the bushes 13 and 16 are provided on the first shaft portion 11 so that the bushes 13 and 16 and the holding cylinder 53 slide, causing wear on the bushes 13 and 16.

For example, the bushes 13 and 16 are replaceably attached to the first shaft portion 11 by shrink fitting. Therefore, when the mandrel 3 is removed from the winding device 1 together with the mandrel 3, it is replaced with new bushes 13, 16. The bushes 13 and 16 are used as sliding bearings, and are preferably made of a metal material with excellent sliding properties, such as a copper alloy or an aluminum alloy, but may also be made of a resin material or a ceramic material.
The bushes 13 and 16 are provided at positions corresponding to a pair of bearings BB1 and BB2 that respectively support holding cylinders 53 (53A, 53B), which will be described later. Note that the winding device 1 includes bearings other than the bearings BB1 and BB2, but the symbols of the other bearings are omitted to avoid complicating the drawings.

[Second shaft portion 15: see FIGS. 5, 6, and 7]
Next, the second shaft portion 15 will be explained.
The second shaft portion 15 is a hollow member that is connected to the first shaft portion 11 and extends forward (F). A wedge 25 for expanding or contracting the diameter of the segment 30 is provided around the second shaft portion 15 having an outer diameter smaller than that of the first shaft portion 11 . The wedge 25 is slidably fitted onto the outer circumferential surface of the second shaft portion 15 and expands and contracts via the fixing ring 17 further forward (F) than the front end (F) of the second shaft portion 15 . It is fixed to the rod 23 of the mechanism 20.

The wedge 25 is one of the elements of the expansion/contraction mechanism 20 and moves in the axial direction C according to the operation of the expansion/contraction mechanism 20. The wedge 25 is a member having a plurality of tapered projections in the axial direction of the second shaft portion 15, and a hollow member is formed by combining a plurality of wedges 25 in the circumferential direction of the second shaft portion 15. The wedge 25 constitutes a direct-acting cam together with the segment 30, and as the wedge 25, which corresponds to the driving joint, moves in the axial direction C, the diameter of the segment 30, which corresponds to the driven joint, increases or decreases in diameter. The configuration of the wedge 25 will be referred to in detail in the following explanation of the expansion/contraction mechanism 20. Movement in the axial direction C includes movement from the front (F) to the rear (R) and movement from the rear (R) to the front (F).

The main shaft 10 is provided with a housing chamber 19 along the direction of the axis C, which is a space in which a hydraulic cylinder 21 constituting the expansion/contraction mechanism 20 and a rod 23 connected to the hydraulic cylinder 21 are arranged. The accommodation chamber 19 includes a cylinder chamber 19A in which the fluid pressure cylinder 21 is arranged, and a rod chamber 19B in which the rod 23 is arranged. The rear (R) end of the cylinder chamber 19A is closed, but the front (F) is connected to the rod chamber 19B. The front (F) end of the rod chamber 19B is open, and the front (F) end of the rod 23 protrudes. As described above, the fluid pressure cylinder 21 and the rod 23 are provided inside the main shaft 10. The fluid pressure cylinder 21 is provided inside the first shaft portion 11 having a large diameter, and the rod 23 is provided therein from the first shaft portion 11 to the second shaft portion 15 having a small diameter. Therefore, the hydraulic cylinder 21 including the rod 23 has a radial dimension that falls within the outer diameter of the main shaft 10.

[Expansion/contraction mechanism 20: See Figures 5, 6, and 7]
Next, the expansion/contraction mechanism 20 will be explained.
The expansion/contraction mechanism 20 includes a fluid pressure cylinder 21 as a drive source that moves the wedge 25 in the axial direction C, and a rod 23 that moves in the axial direction C relative to the fluid pressure cylinder 21. The fluid pressure cylinder 21 is housed in the cylinder chamber 19A, and the rod 23 is inserted into the rod chamber 19B. The rod 23 protrudes from the front (F) end of the rod chamber 19B, and is connected to and fixed to the wedge 25 via the fixing ring 17 at this protruding portion. The hydraulic or pneumatic hydraulic cylinder 21 is only one example of a drive source for moving the wedge 25 in the axial direction C, and other drive sources for moving the wedge 25, such as a direct-acting electric motor, may also be used.

The wedge 25 includes a plurality of cam protrusions 26, each of which extends in the circumferential direction. The plurality of cam protrusions 26 are provided over substantially the entire length of the wedge 25 in the direction of the axis C. For example, each cam projection 26 has a shape in which the diameter continuously increases from the rear (R) to the front (F), and the diameter decreases sharply from the apex of the diameter. The outer peripheral surface of the portion where the diameter increases constitutes a cam surface 27 that contacts and slides with the cam surface 37 of the segment 30 during diameter expansion or diameter contraction.

When, for example, hydraulic oil is supplied to the hydraulic cylinder 21 and the rod 23 is moved rearward (R), that is, moved backward, the wedge 25 fixed to the rod 23 at the front (F) end also moves backward. Then, the cam projection 26 pushes up the segment 30, thereby expanding the diameter of the segment 30. When the rod 23 is moved forward (F) from the expanded state, that is, moved forward, the diameter of the segment 30 is reduced.

[Segment 30: See Figures 3 and 7]
The segments 30 are arranged to surround the second shaft portion 15 with the wedge 25 in between. In this embodiment, as an example, the winding drum is configured by surrounding the second shaft portion 15 with four segments 30. The center angle of each segment 30 having an arcuate cross section is 90°, but when the outer peripheral surfaces of four segments 30 are connected, the cross section becomes circular.
Each segment 30 is connected to the second shaft portion 15 of the main shaft 10 so as to be displaceable in its radial direction. By displacing the segments 30 radially outward, the outer diameter of the winding drum specified by the outer peripheral surface of the segments 30 expands, and by displacing the segments 30 radially inward from that position, the winding drum expands. The outer diameter is reduced.

In the segment 30, the outer circumferential surface 31 is an arcuate surface with an equal diameter in the direction of the axis C, and the inner circumferential surface 32 is formed with a plurality of cam grooves 36 into which the respective cam protrusions 26 of the wedge 25 fit. . For example, each cam groove 36 has a shape in which the diameter continuously increases from the rear (R) to the front (F), and the diameter decreases steeply from the apex of the diameter. The inner circumferential surface 32 of this portion where the diameter increases constitutes a cam surface 37 that contacts and slides on the cam surface 27 of the wedge 25 during diameter expansion or diameter contraction.

[First rotation mechanism 5: see Figures 1, 5, and 6]
Next, the first rotation mechanism 5 will be explained.
The first rotation mechanism 5 holds the mandrels 3A, 3B and transmits the rotational force from the main drive sources 9A, 9B to the mandrels 3A, 3B.
The first rotation mechanism 5 includes a casing 51, a pair of holding cylinders 53A and 53B provided at intervals in the width direction (W) of the casing 51, a main pinion 54A provided in each of the holding cylinders 53A and 53B, 54B. The main pinions 54A and 54B are examples of rotational force receiving parts in the present disclosure.

Main drive shafts 77A and 77B that transmit the rotational force from the reducers 7A and 7B are arranged so as to pass through the casing 51 from the front and rear. The main drive shafts 77A, 77B are arranged at the center of the casing 51 in the width direction (W), and the holding cylinders 53A, 53B are arranged on both sides of the main drive shafts 77A, 77B in the width direction (W). The main drive shafts 77A, 77B are rotatably supported by a plurality of bearings relative to the casing 51.

The holding cylinder 53A holds the mandrel 3A in a removable manner, and the holding cylinder 53B holds the mandrel 3B in a removable manner. At the time of replacement, the mandrels 3A, 3B are removed from the holding cylinders 53A, 53B, and new mandrels 3A, 3B that have been maintained are attached to the holding cylinders 53A, 53B.

The holding cylinders 53A and 53B are supported in the radial direction of the casing 51 by bearings BB1 and BB2, which are rotatable relative to the casing 51, respectively. A pair of bearings BB1 and BB2 are provided at the front (F) and rear (R) of each of the holding cylinders 53A and 53B.
The mandrels 3A, 3B are restrained in the front-rear direction by a cylindrical fixing ring 57 whose rear (R) end in the axial direction C is fixed to the casing 51, and whose front (F) end in the direction of the axis C is The front and rear directions are restrained by a cylindrical fixing ring 58 that can be inserted into and removed from the casing 51. In this way, the mandrels 3A, 3B are restrained from moving in the front-rear direction by the fixing ring 57 and the fixing ring 58. As shown in FIG. 9, the fixing rings 58, 58 having a half-split structure are fixed to the front (F) ends of the holding cylinders 53A, 53B by fastening means BL such as bolts while being inserted into the locking grooves 14. be done. When replacing, the fastening means BL and fixing rings 58, 58 are removed. Then, the mandrels 3A, 3B are no longer restricted to the front (F), so the mandrels 3A, 3B can be pulled out.

A main pinion 54A is fitted into the holding cylinder 53A, and a main pinion 54B is fitted into the holding cylinder 53B. The main pinion 54A meshes with a main gear 81A fitted to the main drive shaft 77A at the rear (R), and the main pinion 54B meshes with a main gear 81B fitted to the main drive shaft 77B at the front (F). Further, the holding cylinder 53A is provided with a main spline 55A that meshes with the driven spline 12A, and the holding cylinder 53B is provided with a main spline 55B that meshes with the driven spline 12B.

As the main drive shafts 77A and 77B rotate, the holding tube 53A is rotated via the main pinion 54A and the main gear 81A, or the holding tube 53B is rotated via the main pinion 54B and the main gear 81B. . By rotating the holding cylinder 53A, the mandrel 3A is rotated through the main spline 55A and the driven spline 12A, and by rotating the holding cylinder 53B, the mandrel 3B is rotated through the main spline 55B and the driven spline 12B.

The main pinions 54A, 54B of the holding cylinders 53A, 53B receive rotational force from the main drive shafts 77A, 77B. The driven side splines 12A, 12B are arranged close to the bearing BB1 on the side of the winding drum made up of the segment 30, which is remote from the main pinions 54A, 54B, of a pair of bearings BB1, BB2 that support the holding cylinders 53A, 53B. be done. This position corresponds to a region where the diameters of the first shaft portion 11 and the holding cylinder 53 are large.

[Second rotation mechanism 6: see Figures 1 and 2]
Next, the second rotation mechanism 6 will be explained.
The second rotation mechanism 6 rotatably supports the first rotation mechanism 5. The second rotation mechanism 6 rotates the first rotation mechanism 5 so that when one mandrel 3A completes winding up a predetermined amount of metal strip SR, the other mandrel 3B can start winding up the metal strip SR. Specifically, in FIG. 1, the first rotation mechanism 5 is rotated by 180 degrees so that the mandrel 3A reaches the position of the mandrel 3B and the mandrel 3B reaches the position of the mandrel 3A.

The second rotation mechanism 6 includes a pedestal 61, and a main drive gear 63 and an idle roller 65 provided on the pedestal 61 at intervals in the width direction (W). A driven gear 59 of the first rotating mechanism 5 is mounted on the main driving gear 63 and the idle roller 65.
The main gear 63 rotates clockwise, for example, by a rotating electric machine (not shown). The main drive gear 63 has a plurality of teeth on its outer peripheral surface, and the teeth of the main drive gear 63 mesh with the teeth of the driven gear 59. The idle roller 65 is rotatably supported by the pedestal 61 via a bearing (not shown). The idle roller 65 has a flat outer peripheral surface.

When the winding of the metal strip SR by the mandrel 3A is completed and the main drive gear 63 is rotated, the first rotation mechanism 5 is rotated via the driven gear 59 that meshes with the main drive gear 63. At this time, the idle roller 65 is rotated as the driven gear 59 rotates. When the mandrel 3B reaches the previous position of the mandrel 3A, the rotation of the main drive gear 63 is stopped.

[ Reducer 7A, 7B: See Figures 1 and 4]
Next, the reduction gears 7A and 7B will be explained.
The reducer 7A decelerates the rotation of the main drive source 9A and transmits it to the holding cylinder 53A, and the reducer 7B decelerates the rotation of the main drive source 9B and transmits it to the holding cylinder 53B.

The reducer 7A includes a gear case 71A, a first reduction gear 73A rotatably supported by the gear case 71A via a bearing, and a second reduction gear 74A rotatably supported by the gear case 71A via a bearing. and a third reduction gear 75A rotatably supported by the gear case 71 via a bearing. The first reduction gear 73A and the second reduction gear 74A mesh with each other, and the second reduction gear 74A and the third reduction gear 75A mesh with each other. A drive shaft 91A of the main drive source 9A is coaxially fixed to the first reduction gear 73A, and a main drive shaft 77A extending to the first rotation mechanism 5 is coaxially fixed to the third reduction gear 75A. As described above, the main pinion 54A is coaxially fixed to the main drive shaft 77A.

The reducer 7B includes a gear case 71B, a first reduction gear 73B rotatably supported by the gear case 71B via a bearing, and a second reduction gear 74B rotatably supported by the gear case 71 via a bearing. and. The first reduction gear 73B and the second reduction gear 74B mesh with each other. A drive shaft 91B of the main drive source 9B is coaxially fixed to the first reduction gear 73B, and a main drive shaft 77B extending to the first rotation mechanism 5 is coaxially fixed to the second reduction gear 74B. As described above, the main pinion 54B is coaxially fixed to the main drive shaft 77B.

The main drive shaft 77A and the main drive shaft 77B both have a cylindrical shape, and the main drive shaft 77A is provided in a gap inside the main drive shaft 77B. A support shaft 79 whose both ends are fixedly supported is provided in the gap inside the main drive shaft 77A. The main drive shaft 77B is rotatable around the support shaft 79, and the main drive shaft 77A is rotatable around the main drive shaft 77B.

[ Main drive sources 9A, 9B: see Figures 1 and 4]
When the metal strip SR is wound up by the mandrel 3A, the main drive source 9A is driven, and this rotational force is transmitted to the speed reducer 7A via the drive shaft 91A. The rotational force transmitted to the speed reducer 7A is transmitted to the main drive shaft 77A, and further rotates the mandrel 3A via the main pinion 54A and the main spline 55A. At this time, the main drive source 9B has stopped operating.

When the metal strip SR is wound up by the mandrel 3B, the main drive source 9B is driven, and this rotational force is transmitted to the speed reducer 7B via the drive shaft 91B. The rotational force transmitted to the reducer 7B is transmitted to the main drive shaft 77B, and further rotates the mandrel 3B via the main pinion 54B and the main spline 55B. At this time, the main drive source 9A has stopped operating.

[Replacing mandrel 3: See Figure 6]
Next, the operation of exchanging the mandrel 3 will be explained.
To replace the mandrel 3B for maintenance, for example, the fixing ring 58 is first removed. When the fixing ring 58 is removed, the mandrel 3B is no longer restrained toward the front (F), so by moving the mandrel 3B toward the front (F), the mandrel is removed from the holding cylinder 53B of the first rotation mechanism 5. 3B can be extracted. After inserting a new mandrel 3B for replacement into the holding cylinder 53B of the first rotation mechanism 5, the fixing ring 58 is fixed to the holding cylinder 53B by the fastening means, thereby completing the replacement work of the mandrel 3B. Maintenance such as replacing the segments 30 is performed on the extracted mandrel 3B.

[Removal of coil CL from mandrel 3: See Figures 4 and 5]
A coil CL formed by winding the metal strip SR around the mandrel 3 is extracted from the mandrel 3.
In order to extract the coil CL from the mandrel 3, a cart (not shown) is used, for example. That is, the cart is moved to the mandrel 3 to receive the coil CL, and then the diameter of the mandrel 3 is reduced to release the restraint of the coil CL, and then the cart is moved to extract the coil CL from the mandrel 3. During this extraction, it is necessary to prevent the coil CL from becoming telescopic, and the coil CL may be difficult to remove from the mandrel 3. In order to cope with these problems, the winding device 1 includes a coil CL extraction assisting mechanism 100. The extraction auxiliary mechanism 100 includes a pressing plate 101 that contacts the rear (R) side of the coil CL and presses the coil CL, and a drive that moves the pressing plate 101 from a standby position shown by a solid line to an extraction position shown by a chain line. A source 103 is provided.

When extracting the coil CL from the mandrel 3, the extracting assist mechanism 100 advances the pressing plate 101, which has activated the drive source 103, from the standby position to the extracting position. By doing so, the extraction auxiliary mechanism 100 can cope with problems when the coil CL is extracted from the mandrel 3.

[Effects produced by the winding device 1]
According to the winding device 1, the expansion/contraction mechanism 20 that changes the outer diameter of the mandrel 3 can be inserted into and removed from the holding cylinder 53 in the axial direction as one body with the mandrel 3. Therefore, according to the winding device 1 of the present disclosure, when replacing the mandrel 3, the expansion/contraction mechanism 20 can be removed together with the mandrel, so the mandrel 3 can be easily replaced in a short time.

According to the winding device 1, the fluid pressure cylinder 21 including the rod 23 has a radial dimension that falls within the outer diameter of the main shaft 10, and the fluid pressure cylinder 21 including the rod 23 has a radial dimension that falls within the outer diameter of the main shaft 10. Provided inside. Therefore, according to the winding device 1, when replacing the mandrel 3, the fluid pressure cylinder 21 and the rod 23 can be removed together with the mandrel 3 while avoiding interference with the holding cylinder 53, so that it is possible to remove the fluid pressure cylinder 21 and the rod 23 together with the mandrel 3 in a short time. You can easily replace the mandrel.

According to the winding device 1, the first shaft portion 11 supported by the bearings BB1 and BB2 via the holding cylinder 53 has a cylindrical appearance. Therefore, according to the winding device 1, the moment arm of the overturning moment acting on the winding drum made of the segments 30 of the mandrel 3 becomes longer, and the reaction force acting on the cylindrical first shaft portion 11 and the surface generated thereby. pressure can be reduced. Thereby, the risk of wear and tear of the first shaft portion 11, such as wear and deformation, can be significantly reduced.

According to the winding device 1, the first shaft portion 11 of the mandrel 3 is fitted with the bushes 13 and 16 in a removable manner at positions facing the pair of bearings BB1 and BB2, respectively. Therefore, according to the winding device 1, by periodically replacing the bushes 13 and 16 when replacing the mandrel 3, for example, the first shaft portion 11 can be prevented from being damaged and the winding device can be wound with a small maintenance cost. The device 1 can be maintained. Particularly, the parts facing the bearings BB1 and BB2 are subject to high loads and are prone to wear and tear, so by replacing these parts with replaceable bushes 13 and 16, wear and tear on the mandrel 3 can be reduced and durability can be improved.

According to the winding device 1, a spline consisting of the driven side spline 12 and the active side spline 55 is applied as the rotational force applying section. Splines have high transmission torque. Furthermore, when replacing the mandrel 3, the inner teeth of the holding tube 53 and the outer teeth of the first shaft portion 11 can be engaged with each other by simply rotating the mandrel slightly in the circumferential direction. It is easy to Further, by adopting a function sharing format in which the bushes 13 and 16 hold the radial load and the spline transmits torque, the gap between the first shaft portion 11 of the main shaft 10 and the holding cylinder 53 can be minimized.

According to the winding device 1, the holding cylinder 53 includes the main pinion 54, which is a rotational force receiving portion to which rotational force is transmitted, and the driven side spline 12 is connected to the main pinion 54 from the segment 30 of the pair of bearings BB1 and BB2. It is arranged close to the bearing BB1 on the side of the winding drum.
Here, since the segment 30 (winding drum) has a considerable weight in addition to the metal strip SR to be wound up, a considerable torsional force is required to rotate the first shaft portion 11. This torsional force is applied to the driven spline 12, but as the position where the torsional force is applied is far from the segment 30, the torsional angle generated in the second shaft portion 15 where the segment 30 is provided increases. Therefore, the winding device 1 brings the driven side spline 12 closer to the segment 30 to suppress the twist angle. Further, since the driven side spline 12 is provided in a region of the holding cylinder 53 having a large diameter, its torsional rigidity is high.

According to the winding device 1, since the outer diameter of the first shaft portion 11 and the opening diameter of the storage space AS taper toward the rear (R), the mandrel is attached to the holding cylinder 53 when replacing the mandrel 3. It is easy to insert the first shaft portion 11 of No. 3.

According to the winding device 1, since the coil extraction auxiliary mechanism 100 that presses the end face of the coil CL is provided, it is possible to prevent the coil CL from unwinding and forming a telescopic shape when the coil CL is extracted from the mandrel 3. , it is possible to prevent the coil CL from becoming difficult to pull out. .

[Configuration replacement, etc.]
Although the preferred embodiments of the present disclosure have been described above, the configurations mentioned in the above embodiments can be selected or replaced with other configurations without departing from the gist of the present disclosure.
For example, in the expansion/contraction mechanism 20, the fluid pressure cylinder 21 is used as a drive source for expanding or contracting the diameter of the segment 30. However, in the present disclosure, there is no restriction on the drive source as long as the segment 30 can be expanded or contracted in diameter, and other drive sources such as a direct-acting electric motor can be used.
In addition, in the winding device 1, the reducers 7A and 7B are interposed between the main drive sources 9A and 9B and the first rotation mechanism 5, but the drive sources having the function equivalent to the reducers 7A and 7B are It can also be used.

1 Winding device 3, 3A, 3B Mandrel 5 First rotation mechanism 6 Second rotation mechanism 7A, 7B Reducer 9A, 9B Main drive source 10 Main shaft 11 First shaft portion 12 Driven side spline 13, 16 Bush 14 Locking groove 15 Second shaft portion 17 Fixing ring 19 Accommodation chamber 19A Cylinder chamber 19B Rod chamber 20 Expansion/contraction mechanism 21 Fluid pressure cylinder 23 Rod 25 Wedge 26 Cam protrusion 27 Cam surface 30 Segment 31 Outer circumferential surface 32 Inner circumferential surface 36 Cam groove 37 Cam surface 51 Casing 53, 53A, 53B Holding cylinder 54A, 54B Main pinion 55A, 55B Drive side spline 57, 58 Fixed ring 59 Driven gear 61 Frame 63 Main drive gear 65 Idle roller 71, 71A, 71B Gear case 73A, 73B First reduction gear 74A, 74B Second reduction gear 75A Third reduction gear 77A, 77B Main drive shaft 79 Support shaft 81A, 81B Main gear 91A, 91B Drive shaft 100 Extraction auxiliary mechanism 101 Pressing plate 103 Drive source A1 First area A2 Second area A3 Third region BB1, BB2 Bearing C Axis F Front R Rear H Height direction L Length direction W Width direction SR Metal strip CL Coil

Claims (12)

1. a mandrel that rotates around an axis and has a winding cylinder and an expansion/contraction mechanism that changes the outer diameter of the winding cylinder;
   a casing to which the mandrel is attached;
   a holding cylinder that holds the mandrel between the casing and the mandrel and rotates coaxially with the mandrel;
   The winding device according to claim 1, wherein the mandrel is configured to be inserted into and removed from the holding cylinder in the axial direction thereof, integrally with the expansion/contraction mechanism.
   
2. In claim 1,
   The mandrel is
   comprising a main shaft that rotates coaxially with the winding drum and extends in the axial direction,
   The expansion/contraction mechanism is
   comprising a fluid pressure cylinder that expands or contracts the outer diameter of the winding cylinder by moving the rod in the axial direction;
   The fluid pressure cylinder including the rod has a radial dimension that falls within an outer diameter of the main shaft.
   
3. In claim 2,
   The fluid pressure cylinder including the rod is a winding device provided inside the main shaft.
   
4. In claim 2 or claim 3,
   a rotational force applying part that transmits rotational force from the holding cylinder to the mandrel;
   a set of bearings provided between the casing and the holding cylinder and on both sides of the rotational force applying section in the axial direction,
   The main axis of the mandrel is
   a first shaft portion having a cylindrical appearance in a portion facing the pair of bearings;
   A winding device configured such that an outer circumference of the first shaft portion and an inner circumference of the holding cylinder are in contact with each other.
   
5. In claim 4,
   A winding device, wherein bushes (13, 16) are replaceably fitted to the first shaft portion of the mandrel at positions facing each of the pair of bearings.
   
6. In claim 4 or claim 5,
   The rotational force applying portion includes a spline in which a plurality of internal teeth provided on the inner periphery of the holding cylinder are engaged with a plurality of external teeth provided on the outer periphery of the first shaft portion of the mandrel. , winding device.
   
7. In claim 6,
   The holding cylinder includes a rotational force receiving part to which rotational force is transmitted,
   The said spline is arrange|positioned close to the said bearing on the said take-up cylinder side among a set of said bearings, and is a winding device.
   
8. In any one of claims 1 to 7,
   A winding device, wherein support of the mandrel in the axial direction with respect to the holding tube is obtained by fastening a split ring to the holding tube.
   
9. In any one of claims 4 to 7,
   If the side from which the mandrel is pulled out is the front, and the opposite side is the rear,
   The first shaft portion of the main shaft has an outer diameter that decreases continuously or stepwise from the front to the rear,
   In the winding device, the accommodation space for the first shaft portion in the holding tube has an opening diameter that decreases continuously or stepwise from the front to the rear.
   
10. In any one of claims 1 to 9,
    If the side from which the mandrel is pulled out is the front, and the opposite side is the rear,
    A winding device comprising a coil extraction auxiliary mechanism that pushes an end face of a coil made of a metal strip wound around the mandrel from the rear toward the front along the axial direction of the mandrel.
    
    
11. A mandrel exchanging method in which a mandrel that rotates around an axis and has a winding cylinder is inserted into and removed from a casing in the axial direction, the method comprising:
    The mandrel is held between the casing and the mandrel, and the mandrel is inserted into and removed from a holding cylinder that rotates coaxially with the mandrel,
    A method for replacing a mandrel, characterized in that the mandrel is configured to be able to be inserted into and removed from the holding cylinder in the axial direction thereof, integrally with an expansion/contraction mechanism that changes the outer diameter of the winding cylinder.
    
12. A mandrel that rotates around an axis and has a take-up cylinder,
    an expansion/contraction mechanism having a fluid pressure cylinder that expands or contracts the outer diameter of the winding cylinder by moving a rod in the axial direction;
    a main shaft that rotates coaxially with the winding drum and extends in the axial direction;
    The mandrel, wherein the hydraulic cylinder including the rod has a radial dimension that falls within an outer diameter of the main shaft.

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