JP6024676B2 - Metal plate transport roll device - Google Patents

Description

  The present invention relates to a transport roll device that sandwiches and conveys a metal plate with upper and lower rolls, and more specifically, a state where both ends of a roll barrel of at least one of the upper and lower rolls are in contact with a plate surface of the metal plate to be transported Thus, the present invention relates to a transport roll device that sandwiches and transports a metal plate with upper and lower rolls.

The winding equipment for winding the hot-rolled steel strip with a coiler is a table roller composed of a plurality of transport rolls for transporting the steel strip, and for guiding the steel strip to the pass line center (centering) on the table roller. A side guide, a steel strip pass line that exits the side guide is guided obliquely downward, a pinch roll that applies a winding tension (back tension) to the steel strip, and a coiler that winds the steel strip.
In winding a hot-rolled steel strip, a winding tension (back tension) is applied with a pinch roll, particularly when the tail end of the steel strip is wound. At this time, if there is a mechanical setting error in the pinch roll, meandering may occur due to the pinch roll, and winding deviation may occur in the coiler. In addition, winding deviation may occur due to side guide setting position error or conveyance position deviation of the steel strip itself.

  As a technique for preventing such winding deviation in the coiler, Patent Document 1 discloses that the steel strip is brought into contact with the steel strip to be passed through at the upstream side position of the pinch roll, and the steel strip is within the pass line plane or the pass line plane. A winding facility provided with a pressing roll that is held at a lower position than that is shown. Further, Patent Document 2 discloses a non-driving type in which a steel strip is constrained between transport rolls as a means for preventing out-of-plane deformation of the steel strip in a specific range between the side guide or between the side guide and the pinch roll. A winding facility provided with a pressing roll is shown.

JP 2009-082987 A JP 2010-240704 A

The techniques disclosed in Patent Documents 1 and 2 are very excellent techniques that can prevent the coil from slipping off by preventing out-of-plane deformation of the steel strip, but have the following problems.
The steel strip winding equipment is a combination of various devices, and the installation space of the holding roll is likely to be limited. In particular, as shown in FIG. 12, when the press roll 30 is installed inside the side guide 32 (in the figure, 31 is a table roller), the press roll having a roll barrel width narrower than the minimum set width of the side guide 32 is used. Therefore, the press roll 30 cannot press the entire width of the steel strip S. In the form of such a press roll, scum is very likely to occur in the steel strip portion where both ends of the roll barrel are in contact. When scouring occurs, the portion is not a product but is often discarded in a subsequent process, resulting in a problem that the yield of the product is lowered and an extra process of discarding is required.

  Accordingly, an object of the present invention is to provide a transport roll device that sandwiches and conveys a metal plate with the upper and lower rolls in a state where both ends of the roll barrel of at least one of the upper and lower rolls are in contact with the plate surface of the metal plate to be transported. It is an object of the present invention to provide a transport roll device capable of transporting a metal plate without causing scum caused by the roll.

In order to evaluate the cause and conditions for the occurrence of scouring, the present inventors can determine what the front and back surfaces of the steel strip S are when the steel strip S is pressed by the pressing roll 30 in the form shown in FIG. A detailed study was conducted to determine whether the stress state was reached, and as a result, the following facts were found.
(1) By pressing with the pressing roll 30, the lower table roller 31 is flexibly deformed and flattened, and the pressure for pressing the steel strip at both ends of the roll barrel of the pressing roll 30 protrudes and becomes high.
(2) In the case of a hot-rolled steel strip, when this pressure value is 100 MPa or more, slag is likely to occur.
(3) Even if the corners at both ends of the roll barrel are rounded, the pressure at the part where the rounding starts (R start position) tends to increase. It ’s difficult.

Based on the above findings, the present inventors have investigated a roll form that does not generate scouring. As a result, the rolls that are in contact with the plate surface of the metal plate conveyed by both ends of the roll barrel (in the above case, press Regarding the roll), it has been found that the occurrence of scouring can be effectively suppressed by forming the hollow barrel open at both ends of the roll barrel.
The present invention has been made on the basis of such findings and has the following gist.

[1] An upper and lower roll is provided, and the both ends of the roll barrel of at least one of the upper and lower rolls (X) are in contact with the plate surface of the metal plate to be conveyed, and the metal plate is clamped by the upper and lower rolls. A transport roll device for transporting,
The roll (X) has a hollow structure in which portions on both ends of the roll barrel are open to the end surface of the roll barrel.

[2] The metal sheet transport roll device according to [1], wherein the lower roll is a transport roll constituting a table roller for transporting the metal plate.
[3] The metal roll transport roll device according to [1] or [2], wherein the corners of both ends of the roll barrel of the roll (X) are rounded.
[4] In the transport roll apparatus according to any one of [1] to [3], the transport roll apparatus for a metal plate is provided on an upstream side of a metal strip winding facility.

  The transport roll device of the present invention opens the both ends of the roll barrel to the end surface of the roll barrel with respect to the roll (at least one of the upper and lower rolls) contacting the plate surface of the metal plate transported by both ends of the roll barrel. By adopting a hollow structure, the both ends of the roll barrel are easily flattened when the metal plate is nipped and conveyed, and the roll surface pressure at the metal plate portion in contact with both ends of the roll barrel does not increase. It is possible to prevent the occurrence of scratches on the metal plate surface by the portion.

1 schematically shows an embodiment of a transport roll apparatus according to the present invention, and is a side view of a winding facility and its upstream region. Arrow view taken along line II-II in FIG. Sectional drawing in the roll axial direction of the upper roll which comprises the conveyance roll apparatus of FIG. Side surface of the upper roll constituting the transport roll apparatus of FIG. Sectional drawing in the roll-axis direction of the upper roll in other embodiment of the conveyance roll apparatus of this invention The front view which shows one Embodiment of the support pressure reduction means of an upper roll in the conveyance roll apparatus of FIGS. 1-4. FIG. 6 is a bottom view of the support reduction means of FIG. FIG. 6 is a side view of the supporting reduction means in FIG. The front view which shows other embodiment of the support roll-down means of an upper roll in the conveyance roll apparatus of FIGS. 1-4. Explanatory drawing which shows typically a mode that the roll barrel end part of the roll X was flattened | deformed when the metal plate was pinched and conveyed with the conveyance roll apparatus of this invention. Drawing which showed typically roll surface pressure distribution in the metal plate surface at the time of carrying out pressure conveyance of the metal plate with the conveyance roll device of the present invention. The front view which shows the conventional conveyance roll apparatus provided with the upper roll (pressing roll) whose whole roll barrel including a roll barrel end part is solid. Drawing which showed typically roll surface pressure distribution in the metal plate surface at the time of carrying out pressure conveyance of a metal plate with the conveyance roll device of FIG.

  The transport roll device of the present invention includes an upper and lower roll, and the upper and lower rolls are metal plates with both ends of the roll barrel of at least one roll X in contact with the plate surface of the metal plate to be transported. The conveying roll device includes a device having a pressing roll as an upper roll as disclosed in Patent Documents 1 and 2, for example. And in this conveyance roll apparatus, it is set as the hollow structure which open | released the part of the roll barrel both ends side of roll X (roll which touches the plate | board surface of the metal plate which both ends of a roll barrel convey) to the roll barrel end surface. .

1 to 4 schematically show an embodiment of a transport roll apparatus of the present invention, in which a transport roll apparatus A is installed in an upstream region of a hot-rolled steel strip winding facility. 1 is a side view of the winding facility and its upstream region, FIG. 2 is an arrow view along the line II-II in FIG. 1, and FIG. 3 is the roll axial direction of the upper roll constituting the transport roll device A 4 is a side view (drawing of the upper roll as seen from the roll axis direction).
The transport roll device includes an upper roll 1 and a lower roll 2 for sandwiching and transporting a steel strip (metal plate), but the transport roll device A of this embodiment is a press as shown in Patent Documents 1 and 2. The roll is an upper roll 1, and the upper roll 1 is a roll X that is in contact with the plate surface of the steel strip S conveyed by both ends of the roll barrel. That is, the roll roll width of the upper roll 1 is smaller than the width dimension of the steel strip S, so that both ends of the roll barrel 10 are in contact with the plate surface (upper surface) of the steel strip S conveyed.

Further, the lower roll 2 of the present embodiment also serves as one of the transport rolls 5 (the transport roll 5a in FIG. 1) constituting the steel strip transport table roller 3. Details of FIG. 1 will be described later.
Here, the holding roll is a rotatable roll that contacts a steel strip passing through the pass line and holds the steel strip in the pass line plane or at a position below the pass line plane. It may be a drive roll.

The upper roll 1 (the roll X in contact with the plate surface of the metal plate conveyed by both ends of the roll barrel) includes the roll barrel 10 and the roll shaft 11, but opens both ends of the roll barrel 10 to the end surface of the roll barrel. This is a hollow structure (hollow part 12). The hollow portion 12 is formed in an annular shape around the roll axis, and is configured in a cylindrical shape (cylindrical in the present embodiment) with the roll axis as a cylindrical core. That is, the length L portions of both ends of the roll in FIG. 3 are hollow except for the thickness t portion and the cylindrical core portion of the outer peripheral portion.
Thus, by making the part of the both ends side of the roll barrel 10 into the hollow structure opened to the end face of the roll barrel, both ends of the roll barrel are easily flattened when the steel strip S is nipped and conveyed. Because the roll surface pressure at the steel strip part where the part comes into contact does not increase (that is, the roll surface pressure at both ends of the roll barrel does not increase due to protrusion), the occurrence of scraping of the steel strip surface at both ends of the roll barrel should be prevented Can do.
The corner portions 14 at both ends of the roll barrel of the upper roll 1 (roll X) are configured to have a curved surface (rounded shape) with R (roundness) in order to further improve the effect of preventing the occurrence of scouring. . This R is preferably 5 mm or more.

The length L in the roll axis direction of each hollow portion 12 formed in the roll barrel 10 varies depending on the size of the upper roll 1, the roll load, and the like, but approximately 50 to 200 mm is appropriate. If the length L is less than 50 mm, the amount of flat deformation at both ends of the roll barrel when the upper roll is used may be insufficient. On the other hand, if the length L exceeds 200 mm, the length of the portion where the roll is solid is shortened, and there is a possibility that the amount of deflection deformation at both ends of the roll barrel when the upper roll is used becomes too large.
In addition, from the viewpoint of preventing out-of-plane deformation of the steel strip, it is preferable that the roll barrel width (length of the roll barrel 10) of the upper roll 1 (roll X) is large. In the winding facility, the roll barrel width needs to be less than 700 mm in order to prevent interference with the side guide. An appropriate roll barrel width may be set in accordance with the structure and size of the roller bearing portion. Further, the diameter of the upper roll 1 (roll X) is suitably about 300 to 600 mm. If the diameter is less than 300 mm, the durability of the roll may be reduced. On the other hand, if the diameter exceeds 600 mm, the facility becomes too large.
Further, the pressing load of the upper roll 1 (roll X) is preferably about 100 to 500 kgf (1 kN to 5 kN). If the pressing load is too small, the out-of-plane deformation of the steel strip cannot be prevented, and conversely if the pressing load is too large, the surface pressure may be excessive and thread may be generated.

The wall thickness t of the roll barrel portion 13 (the roll barrel portion outside the hollow portion 12) in which the hollow portion 12 is formed on the inner side also varies depending on the size of the upper roll 1 and the roll load. Is appropriate. If the wall thickness t is less than 10 mm, there is a possibility that problems such as a concern about insufficient strength and a reduction in usage cost when considering roll wear may occur. On the other hand, if the wall thickness t exceeds 30 mm, the amount of flat deformation at both ends of the roll barrel when the upper roll is used may be insufficient.
As the material of the upper roll 1, a metal material such as carbon steel S45C conventionally used is sufficient, but from the viewpoint of preventing seizure between the roll and the steel strip and reducing roll wear, Those subjected to thermal spraying are preferred.

The method of making the hollow structure which open | released the part of the both ends side of the roll barrel 10 to the roll barrel end surface is arbitrary, For example, the method of cutting a roll barrel from a roll barrel end surface, The method of shrink-fitting a ring-shaped member to a roll axis | shaft Etc. can be taken.
The hollow portion 12 is normally formed in a cylindrical shape having a roll axis as a cylindrical core, and the thickness t of the roll barrel portion 13 (the roll barrel portion outside the hollow portion 12) is constant. For example, you may form so that the thickness t of the roll barrel part 13 may incline in the roll axis direction.
FIG. 5 shows an embodiment (a cross-sectional view in the roll axis direction) of the upper roll 1 (roll X) in that case, and the roll barrel portion 13 has a thickness t that becomes thinner toward the end of the roll barrel. (Thus, the thickness of the hollow portion 12 increases toward the end of the roll barrel). According to such a structure, the flat deformation amount of both ends of the roll barrel can be ensured while ensuring the rigidity of the roll barrel portion 13.

In the winding equipment shown in FIG. 1 and the equipment on the upstream side, a table roller 3, a pinch roll 6 and a coiler 7 comprising a plurality of transport rolls 5 (drive rolls) are provided in this order from the upstream side of the line. The side guide 4 is provided. The width of the side guide 4 is set with a slight margin (wider than the material width) with respect to the width of the steel strip S to be passed.
In the transport roll apparatus A of the present embodiment, among the transport rolls 5 constituting the table roller 3, the transport roll 5a at the downstream end position of the side guide 4 configures the lower roll 2 (that is, the transport roll 5a is the lower roll 2). The upper roll 1 (roll X), which is a pressing roll for preventing out-of-plane deformation of the steel strip, is provided inside the side guide on the transport roll 5a (lower roll 2). Since this press roll (upper roll 1) is provided inside the side guide 4, the roll barrel width is smaller than the width of the steel strip S, and both ends of the roll barrel are on the upper surface of the steel strip S as shown in FIG. Touch.
In addition, this press roll (upper roll 1) is the inner position of the side guide 4 and close to the side guide downstream end of the transport rolls 5 constituting the table roller 3 as in the present embodiment. It is preferable to install on the conveyance roll 5a.

There is no particular restriction on the support structure of the upper roll 1 that is a presser roll, but when both ends of the upper roll 1 are supported by independent support reduction means, the deviation (difference) of the reduction load in the steel strip width direction is different. Since the moment due to the load may become a new meandering factor, the upper roll 1 is preferably in any one of the following forms (a) and (b).
(A) The upper roll 1 is supported by a single support reduction means.
(A) The upper roll 1 is brought into contact with the steel strip by its own weight without being supported by the supporting pressure reduction means.

  In the case of the form (a), the support reduction means includes a single roll support that rotatably supports the upper roll 1 and a lower end pivotally attached to the center in the longitudinal direction of the roll support. It is preferable to have a support pressure reduction arm that holds the support so as to be swingable in the vertical direction with the pivot portion as a fulcrum. In such a support pressure reduction means, since the roll support can swing in the vertical direction, the upper roll 1 can freely tilt in the vertical direction, and even if there is a wedge in the steel strip S, along this Since it can incline, it is hard to produce the differential load in a steel strip width direction especially.

FIGS. 6 to 8 show an embodiment in which the upper roll is supported by such a support reduction means (elevating device), FIG. 6 is a front view, FIG. 7 is a bottom view, and FIG. 8 is a side view. It is.
The support pressure reducing means 15 has roll bearing portions 18 at both ends, and a roll support body 16 that rotatably supports both ends (roll shaft 11) of the upper roll 1 by the both roll bearing portions 18, and a lower end portion thereof. The roll support 16 is composed of a support reduction arm 17 pivotally attached to the center in the longitudinal direction of the roll support 16, and the roll support 16 can swing in the vertical direction in the steel strip width direction with the support attachment arm 17 as a fulcrum. Is held in. In order to pivotally support the support reduction arm 17 at the center of the roll support 16 in the longitudinal direction, support shafts 19 are provided on both sides of the center of the roll support 16 in the longitudinal direction. The bracket 20 at the lower end is pivotably supported. The support reduction arm 17 is provided with a reduction mechanism 21 such as a cylinder device.

Further, in this embodiment, in order to allow the upper roll 1 to reduce the steel strip width direction as evenly as possible, in the vertical direction, the pivot axis position of the upper roll 1 and the support reduction arm 17 (support shaft 19). ) Are made to coincide with each other so that the rolling load by the support rolling arm 17 does not cause a component force other than the rolling direction.
As described above, the upper roll 1 constituting the press roll is supported symmetrically by the single support reduction means 15, more specifically, the roll support 16 and the support reduction arm 17 that holds the roll support 16. Since the steel strip S can be uniformly reduced in the width direction by supporting it with the support reduction means 15 provided with the above, a moment due to a deviation (differential load) of the reduction load in the width direction of the steel strip may occur. Can be prevented. Further, as described above, the roll support 16 can swing in the vertical direction with the support shaft 19 (the pivoting portion) as a fulcrum, and the upper roll 1 can freely tilt in the vertical direction. The differential load in the width direction is particularly difficult to occur.

FIG. 9 is a front view showing another embodiment in the case where the upper roll is supported by the support pressure reducing means, as in FIGS. 6 to 8.
In this embodiment, the center of the pivoting position (supporting shaft 19) of the supporting pressure lower arm 17 with respect to the roll support 16 is located above the roll axis of the upper roll 1.
In such a structure, the roll axis of the upper roll 1 and the center of the pivoting position (support shaft 19) of the support reduction arm 17 do not coincide with each other in the vertical direction. It is preferable that the vertical distance k between the roll axis of the upper roll 1 and the center of the pivoting position of the support pressure lower arm 17 (support shaft 19) is as small as possible. Specifically, the distance is preferably equal to or less than the distance corresponding to the roll diameter of the upper roll 1.
Other configurations are the same as those of the embodiment of FIGS.

In addition, examples of the form (b) include the following.
(I) A pair of elevating guides are provided on both sides of the pass line, and the roll shafts at both ends of the upper roll 1 or the roll bearings supporting the roll shafts are held by the pair of elevating guides so as to be slidable in the vertical direction. Things to make
(II) The upper roll 1 is rotatably supported by a support arm that is rotatable in the vertical direction.
Thus, the upper roll 1 that abuts (contacts) the steel strip S with its own weight can tilt along the wedge even when the steel strip S has a wedge. Hard to occur.

  Moreover, in order to obtain such an effect more appropriately, it is preferable to have a structure in which the upper roll 1 can tilt as freely as possible in the vertical direction. In this sense, in the form (I), it is preferable to provide an appropriate play between the lifting guide and the roll-side member guided by the lifting guide. Similarly, in the form of (II) above, (1) both ends of the upper roll 1 are supported by a pair of independent support arms (one pair of support arms are not connected by a rigid body), (2) A play is provided in the support portion of the upper roll 1 by the support arm to expand the tilt range of the upper roll 1 in the vertical direction. (3) The tilt range of the upper roll 1 in the vertical direction at the base end of the support arm. It is preferable to employ one or more structures, such as providing play to expand

  In the above, although the conveyance roll apparatus which uses the upper roll 1 (roll X) as the pressing roll for preventing the out-of-plane deformation of the steel strip has been described, the present invention is “a roll barrel of at least one of the upper and lower rolls. Any device can be used as long as it is a “conveying roll device that sandwiches and conveys a metal plate with upper and lower rolls in a state where both ends are in contact with the plate surface of the metal plate to be conveyed”. For example, as a device to be applied, a pinch roll of a winding device of a hot-rolled coil, a pinch roll in a heat treatment line of various metal strips, a pinch roll of an annealing line of a cold-rolled steel strip, and a material conveying material in a shear line of a thick plate Examples thereof include a pinch roll and a buckling prevention roll in a hot-rolling sizing press, but are not limited thereto.

In general, at least one of the upper and lower rolls of the transport roll apparatus A of the present invention is a drive roll, but the upper and lower rolls may be non-drive rolls. In this case, the metal plate is moved by the driving force of the driving conveying roll upstream or / and downstream of the conveying roll apparatus A. From the viewpoint of preventing scratches, both the upper and lower rolls are preferably driven rolls.
Moreover, in embodiment mentioned above, an upper roll turns into roll X which contact | connects the plate | board surface of the metal plate which the both ends of a roll barrel convey (namely, roll roll width is smaller than the plate width of the metal plate conveyed). However, the lower roll may be the roll X, and both the upper and lower rolls may be the roll X.
Therefore, in the conveyance roll apparatus provided with the roll X which contacts the plate | board surface of the metal plate which the both ends of a roll barrel convey, the following aspects can be considered as a combination of an up-and-down roll, for example.
・ Upper roll: Roll X, Lower roll: Conveying roll constituting table roller ・ Upper roll: Roll X, Lower roll: Normal roll ・ Upper roll: Roll X, Lower roll: Roll X
・ Upper roll: Normal roll, Lower roll: Roll X

  FIG. 10 schematically shows a state where the end of the roll barrel of the upper roll 1 (roll X) is flattened when the metal plate is nipped and conveyed by the conveyance roll apparatus of the present invention as shown in FIG. (In FIG. 10, hatching of the roll cross section is omitted.) FIG. 11 schematically shows the roll surface pressure distribution on the metal plate surface at that time. Moreover, FIG. 12 is a conveyance roll apparatus (conventional apparatus) provided with the upper roll 1 (pressing roll) in which the entire roll barrel including the end portion of the roll barrel is solid, and FIG. The roll surface pressure distribution in the metal plate surface at the time of pinching conveyance is shown typically.

  In the conventional apparatus of FIG. 12, as shown in FIG. 13, the roll surface pressure becomes large at the R start position where the rounding of the end of the roll barrel starts, and creases are likely to occur at this portion. On the other hand, since the roll barrel end portion of the upper roll 1 is deformed flat as shown in FIG. 10, the transport roll device of the present invention has a roll surface at a portion where the roll barrel end portion is in contact as shown in FIG. The pressure is not particularly large. For this reason, generation | occurrence | production of the scraping in a roll barrel edge part position can be prevented.

In the hot rolling steel strip winding facility of the embodiment shown in FIGS. 1 to 4, the normal steel strip having a thickness of 2 mm and a width of 1000 mm was transported and wound. The upper roll 1 (pressing roll) of the transport roll apparatus A of the present invention has a diameter of 450 mm and a roll barrel width of 300 mm, and the length L of the hollow portion 12 formed at the both ends of the roll barrel is 100 mm, and the roll barrel portion. The wall thickness t of 13 was 15 mm, and the R dimension of the corner portion 14 was 10 mm (example of the present invention).
For comparison, a solid roll having a diameter of 450 mm, a roll barrel width of 300 mm, and an R dimension of 10 mm was used as the upper roll, and the same conveyance and winding as described above were performed (comparative example).

In both the inventive example and the comparative example, after the leading end of the steel strip was wound around the coiler, the nipping conveyance by the conveying roll apparatus A of the present invention and the conveying roll apparatus of the comparative example was started. The force for pressing the steel strip with the upper roll (pressing roll) was 300 kgf.
As a result, in the example of the present invention, no particularly problematic wrinkles occurred on the front and back surfaces of the steel strip, and a coil having a good front and back surface property and a good winding shape was obtained. On the other hand, in the comparative example, the winding shape of the coil is good, but the ridge extending in the longitudinal direction to the parts (two places on both ends) pinched by the end part (R start position) of the upper roll (pressing roll) Because there were countless occurrences, it was not a first-class product.

DESCRIPTION OF SYMBOLS 1 Upper roll 2 Lower roll 3 Table roller 4 Side guide 5, 5a Conveyance roll 6 Pinch roll 7 Coiler 10 Roll barrel 11 Roll shaft 12 Hollow part 13 Roll barrel part 14 Corner part 15 Support pressure lowering means 16 Roll support body 17 Support pressure lower arm 18 Roll bearing part 19 Support shaft 20 Bracket 21 Rolling mechanism X Roll A Transport roll device S Steel strip

Claims (2)

From the upstream side of the line, a table roll comprising a plurality of transport rolls, a pinch roll and a coiler are provided in this order, and a transport roll device installed in a facility provided with a side guide on the table roller,
A non-driving type upper roll disposed inside the side guide and a lower roll serving also as one of the transport rolls constituting the table roller , both ends of the roll barrel of the upper roll being transported metal plate It is a transport roll device that sandwiches and transports a metal plate with upper and lower rolls while in contact with the surface ,
The upper roll has a hollow structure in which portions on both ends of the roll barrel are open to the end face of the roll barrel. The metal roll transport roll device according to claim 1, wherein the corners of both ends of the roll barrel of the upper roll are rounded.

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