JPH0687022A - Take-up machine for strip - Google Patents

Abstract

PURPOSE:To surely prevent mechanical wear and scuffing of a segment from being generated by consisting an outer layer segment with small split pieces and arranging them on the inner layer segment with a suitable gap. CONSTITUTION:The mandrel of a take-up machine for a strip is constituted by connecting with an inner mechanism so that plural segments 4 can expanded/ contracted in a radical direction. Then, the segments 4 are divided into outer layer part 6 and an inner layer segment body 7 in the peripheral direction. The outer layer segments 6 are constituted of small divided pieces and they are arranged on the inner layer segment 7 with a suitable gap 10. The air layer is formed on the outer surface of the inner layer segment body. The outer layer surface of the inner layer segment body is covered integrally with a heat insulating layer. Thus, when a temperature difference occurs between the inside and the outside of the segment, the generated amount of the warp is small and the difficulty of removal of the coil from the mandrel can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mandrel for winding a strip at a high temperature, which is arranged in a line for treating the strip in a heated state such as a hot strip rolling mill or a thin wall continuous casting facility. .

[0002]

2. Description of the Related Art Conventionally, a mandrel having a wedge type expansion / contraction mechanism has been used as a hot strip winding device. The hot strip after processing such as rolling is supplied to this mandrel at a high temperature, and the hot strip is wound around a segment provided around the mandrel.

However, when a hot strip is wound by using this type of winding device, the sliding portion between the slide rod and the wedge shaft constituting the expansion / contraction mechanism by the heat input from the hot strip or the slide rod and the hollow portion. In some cases, the mandrel cannot be expanded or contracted due to seizure caused by deterioration of the grease applied between the shaft and the shaft.

When winding the hot strip,
The outer peripheral side of the segment is heated by the hot strip, and at the same time, the inner peripheral side of the segment is removed by heat transfer to the internal mechanism side of the mandrel. In this way, the segment has a temperature distribution in which the temperature on the surface side is higher than that on the inner peripheral side, and as a result, warpage is likely to occur in the thickness direction. If the segment is warped, it has an effect such that it hinders the tightening of the coil of the hot strip being wound, or the segment itself is damaged.

In order to eliminate such troubles, various structures have been conventionally developed. For example, in Japanese Patent Laid-Open No. 61-17326, a pressing piece fitted with a heat insulating material is inserted between a segment and a slide rod incorporated as a member for moving the segment in the radial direction, and the inside of the mandrel is inserted from the segment. There is disclosed a structure for suppressing heat removal from the slide rod. And
In this device, by covering the surface of the hollow shaft with a heat insulating material and incorporating a water cooling pipe, it is possible to suppress heat radiation from the segment to the hollow shaft and prevent the temperature rise of the hollow shaft.

Further, JP-A-56-47211, JP-A-56-47212, JP-A-56-47215.
The publication discloses a heat transfer sleeve fitted on the outer periphery of the segment to suppress heat transfer from the hot strip to the segment.

Further, in Japanese Patent Laid-Open No. 56-62618, a large number of support materials are provided outside the segment at intervals, and an outer layer having a shape along the outer surface of the mandrel is placed and fixed on the support material. An air layer is provided between the outer layer and the outer surface of the mandrel to suppress heat transfer from the hot strip to the segment.

Further, Japanese Patent Application Laid-Open No. 56-95416 proposes that when the hot strip is wound, the hot strip and the heat insulating material are co-wound to suppress heat conduction to the mandrel.

[0009]

Although various measures have been taken to prevent the seizure of the sliding portion and the warp of the segment due to the heat input from the hot strip, various measures have been taken. There are still many aspects that cannot be said to have sufficient functions or effects.

For example, Japanese Unexamined Patent Application Publication No. Sho 6-96 mentioned in the section of the prior art.
In the case of Japanese Laid-Open Patent Publication No. 1-17326, since the segments are integrated in the longitudinal direction of the body, the amount of thermal expansion during the heat storage of the segment is large, and a large thermal stress is generated due to the restraint at both ends of the segment and the clearance of the mechanical sliding surface can be maintained. Instead, it causes mechanical wear and galling, which causes problems in maintenance and accuracy maintenance. Further, when a temperature difference occurs between the front and back of the segment, the amount of warpage is large, and it may be difficult to take out the coil from the mandrel. In addition, not only the equipment cost is increased due to the provision of the water cooling tube, but there are many problems in terms of maintenance cost.

Further, JP-A-56-47211, JP-A-56-47212 and JP-A-56-47215.
In the one disclosed in the publication, a complicated work of attaching and detaching a heat insulating sleeve provided around the segment for each coil of the hot strip to be wound is required. For this reason, not only the work load is increased, but also it is necessary to prepare a plurality of sleeves, and therefore an obstacle in terms of equipment cost cannot be ignored.

Further, in the one disclosed in Japanese Patent Laid-Open No. 56-62618, since the segments are integrated in the longitudinal direction of the body, the amount of thermal expansion during the heat storage of the segment is large, and a large thermal stress is generated due to the restraint at both ends of the segment. Moreover, the positioning between the outer layer and the support cannot be maintained, which causes mechanical wear and galling, which causes problems in maintenance and accuracy maintenance. In addition, the amount of warpage generated when a temperature difference between the front and back of the segment occurs is large, and it may be difficult to remove the coil from the mandrel. Further, there is a problem that the support material itself is severely worn by the transmission of the strip winding force, and cannot be used for a long period of time. In addition, since it is necessary to fix a large number of supporting materials between the segment and the outer layer, not only the mechanical structure is complicated and the equipment cost is high, but also there are many maintenance problems.

Further, in the case where the hot strip and the heat insulating material are co-wound as described in JP-A-56-95416, it is necessary to remove the heat insulating material when the coil is rewound, which complicates the work. This hinders the improvement of productivity.

As described above, in any of the technologies, sufficient insulation of the segment is not achieved,
Therefore, the problem of obstacles due to the warp deformation of the segments has not been solved yet.

The problem to be solved by the present invention is to reliably prevent the generation of thermal stress and warpage of the segment due to thermal expansion without complicating the mandrel structure, and further to suppress the heat transfer from the segment to the internal mechanism. Another object of the present invention is to provide a structure that can withstand winding of a hot strip for a long time.

[0016]

SUMMARY OF THE INVENTION The present invention is a strip winder having a mandrel having a plurality of segments radially expandable and contractible and connected to an internal mechanism. The segment is divided into an outer layer portion and an inner layer segment main body in the circumferential direction, and the outer layer segment is composed of small divided pieces and arranged with an appropriate clearance. 2. A segment is divided into an outer layer part and an inner layer segment main body in the circumferential direction, an air layer is formed on the outer surface of the inner layer segment main body, and the outer layer segment is composed of small divided pieces and arranged with an appropriate clearance. It is characterized by doing. 3. A segment is divided into an outer layer part and an inner layer segment main body in the circumferential direction, a heat insulating layer is integrally formed on the outer surface of the inner layer segment main body, and the outer layer segment is composed of small divided pieces with appropriate clearance. It is characterized in that they are arranged.

[0017]

[Action]

1. The segment is divided into the outer layer part and the inner layer segment body in the circumferential direction, and the outer layer segment is composed of small pieces and arranged with appropriate clearances, so there is no constraint at both ends of the segment No thermal stress is generated due to the thermal expansion of the segment, and the small amount of thermal expansion of the small segment of the outer layer segment causes a slight displacement between the outer layer of the segment and the inner layer of the segment to cause mechanical wear and galling. Moreover, since the amount of warp generated when a temperature difference occurs between the front and back of the segment is small, it is not difficult to take out the coil from the mandrel.

2. A segment is divided into an outer layer part and an inner layer segment body in the circumferential direction, an air layer is formed on the outer surface of the inner layer segment body, and the outer layer segment is composed of small divided pieces and arranged with a proper clearance. Since there is no constraint at both ends of the segment, thermal stress due to thermal expansion of the segment does not occur during heat storage, and since the amount of thermal expansion of the small segment of the outer layer segment is small, there is a small gap between the segment outer layer and the segment inner layer body. There is little misalignment, no mechanical wear or galling occurs, and the amount of warpage when there is a temperature difference between the front and back of the segment is small, so there is no difficulty in removing the coil from the mandrel.

Further, when the outer layer segment is heated by the hot strip, the heat transfer to the inner layer segment body is suppressed by the presence of the air layer having a small heat transfer coefficient, so that the outer layer segment is heated to a high temperature and the inner layer segment body is cooled to a low temperature. As a result, the heat transfer from the inner layer segment main body to the internal mechanism side of the mandrel is suppressed, and the sliding part between the slide rod and the wedge shaft, which constitutes the expansion / contraction mechanism, or between the slide rod and the hollow shaft. It is possible to operate without causing the baking due to the deterioration of the applied grease and the expansion and contraction of the mandrel.

Further, since the generation of the temperature gradient in the thickness direction of the outer layer segment and the inner layer segment main body is suppressed, the warp deformation of the segment is prevented. Since the air layer is integrally formed on the surface of the inner layer segment, which is a permanent component, the mechanical structure is simpler, the cost is lower, and maintenance is easier than when a large number of support materials are fixed or the outer layer segment, which is a consumable component, is formed. Excel.

3. A segment is divided into an outer layer part and an inner layer segment main body in the circumferential direction, a heat insulating layer is integrally formed on the outer surface of the inner layer segment main body, and the outer layer segment is composed of small divided pieces with appropriate clearance. Since the two ends are not constrained at both ends of the segment, thermal stress due to thermal expansion of the segment does not occur when heat is accumulated, and the thermal expansion amount of the small segment of the outer layer segment is small, so the segment outer layer and segment inner layer body There is little gap between them, mechanical abrasion and galling do not occur, and the amount of warpage when the temperature difference between the front and back of the segment occurs is small, so it is not difficult to take out the coil from the mandrel. .

Further, when the outer layer segment is heated by the hot strip, heat transfer to the inner layer segment body is suppressed by the heat insulating layer, so that the outer layer segment can be kept at a high temperature and the inner layer segment body can be kept at a low temperature. As a result, heat transfer from the inner layer segment body to the internal mechanism side of the mandrel is suppressed, and the grease applied between the slide rod and wedge shaft that make up the expansion / contraction mechanism and between the slide rod and the hollow shaft deteriorates. It is possible to operate without causing the seizure due to, and without making the expansion and contraction of the mandrel impossible.

Further, since the generation of the temperature gradient in the thickness direction of the outer layer segment and the inner layer segment main body is suppressed, the warp deformation of the segment is prevented. Since the heat insulating layer is integrally formed on the outer surface of the inner layer segment, it is more excellent in preventing deterioration of the heat insulating layer and in maintainability than simply sandwiching the heat insulating material.

[0024]

1 is a longitudinal sectional view of a mandrel of a winding device, and FIG. 2 is a longitudinal sectional view taken along a plane orthogonal to the axis of the mandrel. The mandrel 1 is a segment type that has been conventionally used, and a wedge shaft 3 is inserted into a hollow shaft 2 so as to be movable in the axial direction thereof. Four segments 4 are arranged on the outer circumference of the mandrel 1, and the inner circumference side of each is connected to the hollow shaft 2 so that they can be moved in the radial direction.

The wedge shaft 3 has a wedge surface 3a on its peripheral surface.
Are arranged, and the radial position of each segment 4 is set by utilizing the movement in the axial direction and the inclination of the wedge surface 3a. Such a radial movement of the segment 4 is performed via a slide rod 5 incorporated between the wedge shaft 3 and the segment 4, and the slide rod 5 changes its position in the radial direction by the movement of the wedge surface 3a. The position of segment 4 is determined by.

Each segment 4 makes direct or indirect contact with each of the slide rod 5, the wedge shaft 3 and the hollow shaft 2 which are connected to the inner peripheral side thereof, and when the hot strip is wound around the segment 4, these segments are connected to these members. Heat transfer occurs. The segment 4 itself is provided with a heat insulating structure for suppressing such heat transfer and making the temperature distribution in the thickness direction of the segment 4 uniform.

FIG. 3 shows an example in which a segment is divided into an outer layer segment and an inner layer segment main body 7 in the circumferential direction, and the outer layer segment is composed of small divided pieces 6 and arranged in an array with a proper clearance 10. It is a perspective view.

FIG. 4 shows that a segment is divided into an outer layer segment and an inner layer segment body 7 in the circumferential direction, an air layer 9 is formed on the outer surface of the inner layer segment body 7, and the outer layer segment is composed of small divided pieces 6. FIG. 3 is a perspective view of a main part showing an example of forming an array with an appropriate clearance 10.

In FIG. 5, a segment is divided into an outer layer segment and an inner layer segment main body 7 in the circumferential direction, an insulating layer 8 is integrally formed on the outer surface of the inner layer segment main body 7, and the outer layer segment is divided into small pieces 6. FIG. 6 is a perspective view of a main part showing an example of forming and arranging with an appropriate clearance.

The segment 4 is divided into an outer layer segment and an inner layer segment main body 7 in the circumferential direction, and the outer layer segment is composed of small-divided pieces 6 and arranged with an appropriate clearance 10. With this configuration, even if the outer layer segment accumulates heat, since there is no constraint at both ends of the segment, thermal stress is not generated due to thermal expansion of the segment during heat accumulation, and the amount of thermal expansion of the outer layer segment subdivision piece 6 is very small. Therefore, the deviation between the outer layer segment 6 and the inner layer segment main body 7 is minimal, and mechanical wear and galling do not occur. Furthermore, since the amount of warpage generated when a temperature difference between the front and back of the segment occurs is small, it is not difficult to remove the coil from the mandrel.

Further, by forming the air layer 9 on the outer surface of the inner layer segment body 7, the number of surfaces where the outer layer segment 6 and the inner layer segment body 7 directly contact each other is reduced. Air layer 9
Is integrally formed on the outer surface of the inner layer segment body 7 which is a permanent component, so when a large number of supporting materials are fixed between the outer layer segment 6 and the inner layer segment body 7 or when it is formed on the outer layer segment 6 which is a consumable item. It has a simpler mechanical structure, lower cost, and better maintainability. The air layer 9 may be knurled or dimpled.

Further, the heat insulation layer 8 is integrally formed on the outer surface of the inner layer segment body 7 so that the outer layer segment 6 and the inner layer segment body 7 do not come into direct contact with each other. The heat insulating layer 8 may be formed by applying heat-resistant wool in conformity with the shape of the outer surface of the inner layer segment body 7, but ceramics such as alumina or zirconia may be sprayed or chemically treated on the outer surface of the inner layer segment body 7. It is more preferable to integrally form the heat insulating layer 8 from the viewpoint of preventing deterioration of the heat insulating layer 8 and improving maintainability.

With such a structure, even if the outer layer segment 6 is heated by the hot strip when the hot strip is wound, the heat insulation layer 8 or the air layer 9 is provided so that the outer layer segment 6 is transferred to the inner layer segment body 7. Heat transfer is low. Therefore, the inner layer segment body is maintained at a low temperature, and the temperature gradient in the thickness direction is small. Therefore, the warp of the inner layer segment body 7 is suppressed. Further, the outer layer segment 6 is maintained at a high temperature, and a temperature gradient in the thickness direction is less likely to occur. Therefore,
The warp of the outer layer segment 6 is also suppressed. further,
Since the inner layer segment main body 7 is maintained at a low temperature, there is no heat conduction from the inner layer segment main body 7 to the internal mechanism side of the mandrel 1, and the sliding portion between the slide rod 5 and the wedge shaft 3 constituting the expansion / contraction mechanism and the slide rod. It is possible to operate the mandrel 1 without causing expansion or contraction of the mandrel 1 without causing seizure due to deterioration of the grease applied between the hollow shaft 5 and the hollow shaft 2.

[0034]

According to the present invention, the segment is divided into the outer layer portion and the inner layer segment main body in the circumferential direction, and the outer layer segment is composed of small divided pieces and is arranged with an appropriate clearance. Since there is no restraint of heat generation, thermal stress does not occur due to thermal expansion of the segment during heat storage, and since the amount of thermal expansion of the small segment of the outer layer segment is small, the deviation between the segment outer layer and the segment inner layer body is minimal and mechanical No wear or galling occurs, and the amount of warpage generated when a temperature difference between the front and back of the segment occurs is small, so it is not difficult to remove the coil from the mandrel.

Further, by forming an air layer 9 on the outer surface of the inner layer segment body 7, the surface where the outer layer segment 6 and the inner layer segment body 7 are in direct contact is reduced, and the heat insulating layer 8 is formed on the outer surface of the inner layer segment body 7. The outer layer segment 6 and the inner layer segment body 7 are formed by integrally forming the coating.
In order to prevent direct contact between the outer layer segment and the hot strip, the outer layer segment has a high temperature distribution, and the inner layer segment body does not have a large temperature gradient in the thickness direction at low temperature. Operates without seizure due to deterioration of grease applied between the slide rod and wedge shaft or between the slide rod and the hollow shaft that make up the mechanism, and the mandrel cannot be expanded or contracted. be able to. Further, since the warp deformation of the segment is prevented, the coil can be wound tightly and the segment itself is not damaged.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a mandrel of a winding device of the present invention.

2 is a vertical cross-sectional view of the mandrel of FIG.

FIG. 3 is a perspective view of a main part showing an example in which a segment is circumferentially divided into an outer layer segment and an inner layer segment main body, and the outer layer segment is composed of small-divided pieces and arranged in an array with an appropriate clearance.

[Fig. 4] A segment is divided into an outer layer segment and an inner layer segment body in the circumferential direction, an air layer is formed on the outer surface of the inner layer segment body, and the outer layer segment is composed of small divided pieces with proper clearances. FIG. 6 is a perspective view of a main part showing an example of forming an array by means of an array.

[Fig. 5] A segment is divided into an outer layer segment and an inner layer segment body in the circumferential direction, a heat insulating layer is integrally formed on the outer surface of the inner layer segment body, and the outer layer segment is composed of small divided pieces to provide a proper clearance. FIG. 6 is a perspective view of a main part showing an example of placing and arranging.

[Explanation of symbols]

 1 Mandrel 2 Hollow Shaft 3 Wedge Shaft 4 Segment 5 Slide Rod 6 Outer Layer Segment 7 Inner Layer Segment Body 8 Insulation Layer 9 Groove Air Layer 10 Clearance 11 Mounting Bolt

Claims (3)

[Claims] 1. A winder for a strip having a mandrel connected to an internal mechanism so as to be capable of expanding and contracting a plurality of segments in a radial direction, wherein the segment is circumferentially divided into an outer layer portion and an inner layer segment body. A strip winding machine characterized in that the outer layer segment is composed of small pieces and arranged on the inner layer segment with a proper clearance. 2. The strip winding machine according to claim 1, wherein an air layer is formed on the outer surface of the inner layer segment body. 3. The winder for strips according to claim 1, wherein the outer surface of the inner layer segment main body is integrally formed with a heat insulating layer.