JP2002018509A - Hot run table for conveying hot steel strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot run table with which the traveling of a hot steel strip 2 is stabilized by slightly modifying an ordinary hot run table and whose maintenance cost is lower. SOLUTION: This hot run table for conveying the hot steel strip is provided with a plurality of conveying table rollers 4 having an annular groove for guiding an endless belt in the direction of the outer peripheral surface, cooling means 9 for jetting a cooling fluid 10 to the under surface of the hot strip 2 after finish rolling between the table rollers 4, the endless belt 3 a part of which in the longitudinal direction is guided in each annular groove of the conveying table rollers 4 along the longitudinal direction of the top of the hot run table and a guide 8 for guiding a part in the longitudinal direction of the endless belt in each annular groove of the table rollers 4 and also guiding other parts in the longitudinal direction of the endless belt to the outside of the hot run table.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot run table for stably transferring a hot-rolled steel strip after finish rolling to a coiler.

[0002]

2. Description of the Related Art In a generally practiced method of manufacturing a hot-rolled steel strip, a hot-rolled steel strip after finish rolling is blown with a cooling fluid while being conveyed on a hot run table to a predetermined temperature. It is cooled to a temperature and finally wound up on a coiler via a pinch roller.

However, this method has the following problems when a thin hot-rolled steel strip having a thickness of 2 mm or less is manufactured. That is, from the time the hot-rolled steel strip tip exits the finish rolling mill to the time when it is engaged with the pinch roller (the hot-rolled steel strip tip)
During the time between the end of the hot-rolled steel strip exiting the finishing mill and reaching the pinch roller (the rear end of the hot-rolled steel strip), the running of the hot-rolled steel strip on the hot run table becomes unstable. However, there is a problem that flying and waving are likely to occur. Also,
In order to suppress these phenomena, if the finish rolling speed at the tip of the hot-rolled steel strip is reduced, the temperature drop during finish rolling will increase, causing phase transformation during finish rolling, etc. The material is significantly deteriorated as compared with other parts.
Further, if the running of the leading and trailing end portion of the hot-rolled steel strip becomes unstable, winding failure, winding failure, and cooling unevenness are likely to occur.

The following are known as prior arts for stabilizing the running of a hot-rolled steel strip on a hot run table.

(A) Japanese Patent Application Laid-Open No. 56-56715 A conveying device is disclosed which clamps the tip of a hot-rolled steel strip, applies tension to the strip, and pulls it to a coiler.

(B) Japanese Patent Application Laid-Open No. Hei 4-138818 discloses an apparatus that uses a linear motor to convey an electromagnetic force to the front and rear ends of a hot-rolled steel strip.

(C) Japanese Patent Application Laid-Open No. 9-192717 A conveying device for preventing the floating of a strip by a fluid force is disclosed.

(D) Japanese Patent Application Laid-Open No. 5-185128 A threading method is disclosed in which the tip of a hot-rolled steel strip is processed into a corrugated shape to provide rigidity and stabilize traveling.

(E) Japanese Patent Application Laid-Open No. Sho 62-127102 A hot rolling equipment for steel strip in which a hot run table is inclined is disclosed.

(F) JP-A-6-269832 A plurality of belt conveyors for driving a shaft and rotating a belt are arranged in a staggered manner between a finishing mill and a coiler.
A hot run table provided with a cooling device in a gap between belt conveyors is disclosed.

(G) Japanese Patent Application Laid-Open No. H11-300408 An annular groove is formed in the outer circumferential direction of a plurality of transport table rollers adjacent in the transport direction, and an endless belt is formed between the plurality of transport table rollers via the annular groove. A hot run table having a structure in which the endless belt is wound and moved with the rotation of a transfer table roller is disclosed. With such a structure, the endless belt prevents a part of the hot-rolled steel strip from bending between the transfer table rollers, and the running of the hot-rolled steel strip is stabilized.

[0012]

However, the above-mentioned prior arts (A) to (G) have the following problems.

(A) JP-A-56-56715 It is not useful for stabilizing the running of the rear end of the hot-rolled steel strip. Also,
It is difficult to control the speed of the traveling vehicle that transports the hot-rolled steel strip, and the equipment cost is large.

Unless the temperature of the hot-rolled steel strip is below the Curie point, it cannot be used. That is, if the temperature is not lower than the Curie point, an electromagnetic force cannot be applied and a desired effect cannot be obtained. Also, the equipment cost is large.

(C) Japanese Unexamined Patent Application Publication No. 9-192717 In some cases, runout instability may occur at a position other than the leading end, but when applied to a position other than the leading end of a hot-rolled steel strip, interference with cooling water may occur. Inevitable. Further, even when the hot-rolled steel strip is used only at the leading end, it is difficult to detect the tip of the hot-rolled steel strip and control the spraying of the fluid.

(D) Japanese Unexamined Patent Publication No. 5-185128 In some cases, the instability of run-out running may occur from a portion other than the leading end, but it can be applied only to the leading end of a hot-rolled steel strip. That is, there is only an effect of preventing the floating of the forefront part. Also, it is difficult to bite into a coiler. Even if a straightening machine is provided in front of the coiler, it will not completely return to its original shape due to springback.

(E) JP-A-62-127102 This is applicable only when a hot run table is newly provided.

(F) JP-A-6-2699832 If a normal hot-run table is modified and a belt as described in JP-A-6-2699832 is applied to the transfer table roller, the distance between the transfer table rollers is increased. The cooling water from the cooling nozzle to the lower surface of the hot-rolled steel strip is blocked by about half, and the cooling capacity is insufficient. For this reason, it is necessary to increase the cooling capacity and to extend the hot run table, which eventually increases the equipment cost. The same applies when a new hot run table is provided.
In addition, the belt is in constant contact with the hot-rolled steel strip at a high temperature, so that the belt is severely worn. For this reason, frequent inspection and replacement of the belt is required, which increases maintenance costs. Further, the hot-rolled steel strip may come into contact with the edge of the belt, and a flaw may be generated on the surface of the hot-rolled steel strip.

(G) JP-A-11-300408 The problems (A) to (F) described above can be solved. However, from the following points, a long line stoppage is required to install or replace the endless belt. There is a problem of needing.

(1) When a roller chain or a metal belt is used as the belt for the endless belt, it is relatively easy to connect both ends of the belt at the place of attachment to form an endless belt. When the lower surface of the hot-rolled steel strip comes into contact with the endless belt made of such a material, there is an extremely high risk of generating a flaw in the contact portion. For this reason, materials such as a roller chain and a metal belt are unsuitable as a belt for an endless belt.

(2) On the other hand, when a non-metallic rope having high heat resistance is used as the belt for the endless belt, the problem of scratches on the lower surface of the hot-rolled steel strip can be avoided. However,
When connecting both ends of the rope to form an endless belt, the diameter of the connected portion is twice or more larger than the diameter of the non-connected portion in a method that simply ties the both ends of the rope. Therefore, it is extremely difficult to cause the connecting portion having a diameter twice or more as large as that on the transport table roller to travel with the rotation of the transport table roller. In order to solve this problem, the connection method must be such that the diameter of the connecting part of the rope is the same as the diameter of the non-connecting part. Even for highly skilled workers, it takes about ten to several hours to several days, and every time the endless belt is replaced, the line must be stopped during this time, resulting in a drastic reduction in line operation rate. become.

On the other hand, if the endless belt is formed by connecting the ropes in a ring beforehand, the time required for connecting the ropes when exchanging the endless belt is unnecessary. Since the endless belt cannot be attached unless the line is once removed, the line must be stopped for several ten hours to several days, which is not practical.

An object of the present invention is to solve the above-mentioned problems of the prior art and to make a minor modification of a normal hot run table,
An object of the present invention is to provide a hot run table capable of stabilizing the running of a hot-rolled steel strip and having a low maintenance cost.

[0024]

In the apparatus disclosed in Japanese Patent Application Laid-Open No. H11-300408, the present inventors contribute to stabilization of running of a thin hot-rolled steel strip on a hot run table by using an endless belt. Focusing on the point that only the belt part running on the upper surface of the table roller, it is not necessary to guide the other belt parts along the table roller, The belt part other than the belt part that has been used is structured so as to be guided to the outside of the hot run table, so that the endless belt can be attached and detached without removing the table roller. is there.

That is, the hot run table of the present invention has the following features. (1) A plurality of transport table rollers having an annular groove for an endless belt guide in the outer circumferential direction, and cooling means for spraying a cooling fluid between the transport table rollers on the lower surface of the hot-rolled steel strip after finish rolling. An endless belt whose part in the longitudinal direction of the belt is guided into each annular groove of the plurality of transport table rollers along the longitudinal direction of the hot run table upper surface; A guide device for guiding the inside of each annular groove of the table roller and guiding another portion of the endless belt in the longitudinal direction to the outside of the hot run table, the hot run table for transporting a hot-rolled steel strip.

(2) The depth a of the annular groove formed on the transfer table roller and the thickness b of the endless belt are configured to satisfy a> b, and the endless guide guided into the annular groove on the upper surface of the hot run table. The hot run table for transporting a hot-rolled steel strip according to the above (1), wherein the upper surface of the belt is positioned lower than the upper surface of the transport table roller constituting the material transport surface.

(3) The above (1) or (2), wherein the endless belt is provided with two or more endless belts, and the transport table roller is provided with two or more annular grooves for guiding the endless belt. Hot run table for conveying hot rolled steel strip.

(4) The hot run table for transporting a hot-rolled steel strip according to any one of the above (1) to (3), further comprising a tension control device for controlling the tension of the endless belt.

(5) A plurality of table roller groups each including a plurality of adjacent transport table rollers and sharing at least one endless belt are provided, and the adjacent table roller groups share one transport table roller. The hot run table for transporting a hot-rolled steel strip according to any one of the above (1) to (4), characterized in that:

[0030]

1 to 4 show an embodiment of a hot run table according to the present invention. FIG. 1 is a side view,
2 is a plan view, FIG. 3 is a front view, and FIG. 4 is a front view of a transport table roller.

The hot run table of the present embodiment comprises a plurality of transport table rollers 4 arranged at appropriate intervals between the finishing mill 1 and a pinch roller 5 provided on the side of the coiler 6, and the transport table rollers. 4, a cooling means 9 for spraying a cooling fluid 10 on the lower surface of the hot-rolled steel strip 2 after finish rolling, and an endless belt whose part in the belt longitudinal direction is guided along the longitudinal direction of the hot run table upper surface. 3, a guide device 8 for guiding the endless belt 3 into and out of the hot run table, and a tension control device 7 for controlling the tension of the endless belt 3.

As shown in FIG. 4, each of the transport table rollers 4 has an annular groove 40 for guiding the endless belt 3 in the outer circumferential direction at the center of the roller body. The annular groove 40 has, for example, an arc-shaped cross section, and is configured to satisfy a> b when the depth of the groove 40 is a and the thickness of the endless belt 3 is b, and is guided into the annular groove 40. The upper surface of the endless belt 3 is located below the upper surface of the transfer table roller 4 constituting the material transfer surface. Here, the difference between the depth a of the annular groove 40 and the thickness b of the endless belt 3 (a
-B) is a case where a part of the hot-rolled steel strip 2 is
In order to prevent the bent portion of the hot-rolled steel strip from coming into contact with the endless belt 3 when the sheet is bent, the length thereof is suppressed to 20 mm or less, preferably 10 m.
m or less.

The endless belt 3 has a portion in the belt longitudinal direction guided along the longitudinal direction of the upper surface of the hot run table into each annular groove 40 of the plurality of transport table rollers 4, and the other portion extends outside the hot run table. Guided by the guide device 8.

The endless belt 3 can be made of, for example, organic or inorganic fibers having high heat resistance. The cross section of the endless belt 3 is not limited to a belt shape, but may be any shape such as a square shape or a circular shape (that is, a rope shape). In this respect, the rope shape is most preferable. The width or diameter of the endless belt 3 is preferably smaller from the viewpoint of not blocking the cooling fluid, but preferably has a certain width or diameter from the viewpoint of strength and durability. A width or diameter of about 20 mm, preferably about 5 to 10 mm is appropriate.

The guide device 8 guides a part of the longitudinal direction of the endless belt 3 into each annular groove 40 of the plurality of table rollers 4 as shown in FIGS. The other parts are guided to the outside of the hot run table. The vertical guide sheaves 80a and 80b provided below the transport table rollers 4 on the entrance side and the exit side of the hot run table, respectively. Horizontal guide sheaves 82a and 82b provided on the side, intermediate guide sheaves 81a and 81b provided between the vertical guide sheave 80a and the horizontal guide sheave 82a, and between the vertical guide sheave 80b and the horizontal guide sheave 82b, respectively. It is composed of

According to such a guide device 8, the endless belt 3 is moved from the hot run table exit side to the guide sheave 80.
b, 81b, 82b, 82a, 81a, and 80a are sequentially guided to the hot run table entrance side. Further, the portion of the endless belt 3 between the horizontal guide sheaves 82b and 82a has a linear shape substantially parallel to the endless belt 3 guided on the hot run table.

The tension control device 7 applies tension to the endless belt 3 at a substantially intermediate position between the horizontal guide sheaves 82b and 82a. For example, the tension control device 7 includes a pressing roller 70 that engages with the belt 3 and presses it. And a cylinder device 71 for holding the pressing roller 70 and moving the pressing roller 70 forward and backward with respect to the endless belt 3.

The cooling means 9 sprays a cooling fluid 10 made of, for example, water or air or a mixture thereof on the lower surface of the hot-rolled steel strip 2 after finish rolling at least at a portion between the transfer table rollers 4. In this example, a header 90 is arranged along the width direction of the hot-rolled steel strip, and a plurality of nozzles 9 are provided at appropriate intervals along the longitudinal direction of the header 90.
It consists of one.

Next, the operation and operation of the hot run table of the above embodiment will be described. As shown in FIG. 4, the endless belt 3 is guided into the annular groove 40 of the transport table roller 4 on the upper surface of the hot run table as shown in FIG. 4, and is rotated by the frictional force with the inner surface of the annular groove 40. It travels along with it. This friction force is adjusted by the tension control device 7.

Hot-rolled steel strip 2 finish-rolled by finishing mill 1
Is transported on a hot run table to a pinch roller 5 as shown in FIG. Further, as shown in FIG. 4, the upper surface of the endless belt 3 guided into the annular groove 40 on the upper surface of the hot run table is positioned lower than the upper surface of the transfer table roller 4 constituting the material transfer surface. Therefore, only when a part of the hot-rolled steel strip 2 bends between the transfer table rollers 4, the endless belt 3 contacts the hot-rolled steel strip 2 and pushes the hot-rolled steel strip 2 upward to travel. Stabilize. When the hot-rolled steel strip 2 is running normally, the hot-rolled steel strip 2 does not contact the endless belt 3.

When the endless belt 3 is worn, for example, and it is time to replace the belt, the tension control device 7 releases the tension applied to the belt to loosen the tension of the endless belt 3, and then moves the endless belt 3 to the transport table. The belt is removed from the annular groove 40 of the roller 4 and each guide sheave, a new endless belt 3 is mounted on the annular groove 40 of the transport table roller 4 and each guide sheave, and the belt is exchanged only by applying tension to the belt by the tension controller 7. finish.

FIG. 5 is a plan view showing another embodiment of the hot run table of the present invention. If the width center line of the hot-rolled steel strip 2 is almost directly above the endless belt 3, one endless belt 3 is located at the center in the width direction of the transfer table roller 4 as shown in FIG.
Is a hot run table with a guided structure.
Can be stabilized, but when the width center line of the hot-rolled steel strip 2 is shifted due to meandering of the hot-rolled steel strip 2, the running of the hot-rolled steel strip 2 becomes unstable. So hot rolled steel strip 2
Endless belt 3 to stably support the width direction of
It is desirable to provide more than two symmetrically. FIG. 5 shows one embodiment.

The hot run table of the embodiment shown in FIG. 5 comprises a plurality of transfer table rollers 4 arranged at appropriate intervals from the finishing mill 1 to a pinch roller 5 provided on the side of the coiler 6. Transport table roller 4
A cooling means 9 for spraying a cooling fluid 10 onto the lower surface of the hot-rolled steel strip 2 after finish rolling, and an endless belt 3A whose part in the belt longitudinal direction is guided along the longitudinal direction of the hot run table upper surface. , 3B, guide devices 8A, 8B for guiding the endless belts 3A, 3B into and out of the hot run table, respectively, and tension control devices 7A, 7B for controlling the tension of the endless belts 3A, 3B, respectively.

Each of the transport table rollers 4 has annular grooves 40A and 40B formed symmetrically with respect to the center of the transport table roller 4 in the width direction.
A and 3B are respectively guided in the annular grooves 40A and 40B along the longitudinal direction of the upper surface of the hot run table. The configurations of the endless belts 3A and 3B, the annular grooves 40A and 40B of the conveying table roller for guiding them, the guide devices 8A and 8B, and the tension control devices 7A and 7B are the same as those in the embodiment shown in FIGS. It is. Therefore, the same reference numerals are given and detailed description is omitted. The same applies to the operation and operation.

FIG. 6 is a plan view showing another embodiment of the hot run table of the present invention. In the hot run table of the present invention, one endless belt 3 does not need to be guided by all the transport table rollers 4 in the longitudinal direction of the hot run table. The endless belt 3 may be guided for each table roller group. However, in this case, in order to eliminate discontinuous portions of the endless belt 3 in the longitudinal direction of the hot run table, adjacent table roller groups must share at least one transport table roller 4. FIG. 6 shows one embodiment. FIG. 6 shows only the transport table roller 4 and the endless belt 3 guided in the hot run table.

In the embodiment shown in FIG. 6, one table roller group X (Xa to Xc) is constituted by four transport table rollers 4 arranged adjacent to each other in the longitudinal direction of the hot run table.
And the adjacent table roller group X
Share one transfer table roller 4. That is, in the example of FIG. 6, the adjacent table roller groups Xa and X
b shares the transport table roller 4a, and the adjacent table roller groups Xb and Xc share the transport table roller 4b. And each of these table roller groups
The transport table roller 4 constituting X is formed with annular grooves 40A and 40B at symmetrical positions around the center position in the width direction of the transport table roller 4, and for each such table roller group, FIG. Two similar endless belts 3A and 3B, a guide device (not shown) for guiding these endless belts into and out of the hot run table, and a tension control device (not shown) for controlling the tension of the endless belt are provided. .

The endless belts 3A and 3B, the guide device,
Details of the tension control device and the like are the same as in the embodiment shown in FIG.

In the hot run table of such an embodiment, repairs for troubles such as breakage of the endless belt can be completed by one table roller group.
It will be very easy to handle. FIG.
This is the same as the embodiment shown in FIG.

According to the hot run table of the present invention, when a part of the hot-rolled steel strip 2 bends between the transfer table rollers 4, the endless belt 3 comes into contact with the hot-rolled steel strip 2 and 2 is pushed upward, the leading end of the thin hot-rolled steel strip 2 (between the end of the hot-rolled steel strip leaving the finishing mill 1 and the bite of the pinch roller 5) and the rear end (hot-rolled steel strip) (From the time when the rear end of the belt exits the finishing mill 1 to the time when the belt reaches the pinch roller 5), the transport speed can be increased, and the time required for mounting the endless belt 3 can be increased. Can be greatly reduced, and a decrease in the operation rate can be prevented.

[0050]

As described above, according to the present invention,
By slightly modifying the ordinary hot run table, the running of the hot rolled steel strip on the hot run table can be stabilized, and the time required for installing or replacing the endless belt can be greatly reduced.

In particular, in the hot run table of the present invention,
The run-out running of the leading end and the trailing end of the thin hot-rolled steel strip is stabilized, so that the finishing rolling speed can be increased, and the productivity is improved and the deterioration of the material of the leading end is prevented.
In addition, unsuccessful winding, poor winding, or uneven cooling does not occur, and the line stoppage for installing or replacing the endless belt is greatly reduced, thereby reducing the operating rate of the hot-rolled steel strip manufacturing equipment, It is possible to dramatically improve productivity.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a hot run table of the present invention.

FIG. 2 is a plan view showing an embodiment of the hot run table of the present invention.

FIG. 3 is a front view showing an embodiment of the hot run table of the present invention.

FIG. 4 is a front view of a transport table roller in one embodiment of the hot run table of the present invention.

FIG. 5 is a plan view showing another embodiment of the hot run table of the present invention.

FIG. 6 is a plan view showing another embodiment of the hot run table of the present invention.

[Explanation of symbols]

 Reference Signs List 1 finishing mill 2 hot-rolled steel strip 3, 3A, 3B endless belt 4 transport table roller 40, 40A, 40B transport table roller annular groove 5 pinch roller 6 coiler 7, 7A, 7B tension control device 70 pressing roller 71 cylinder device 8 , 8A, 8B Guide device 80a, 80b Vertical guide sheave 81a, 81b Intermediate guide sheave 82a, 82b Horizontal guide sheave 9 Cooling means 90 Header 91 Nozzle 10 Cooling fluid

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoichi Honashiki 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Sadanori Imada 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. F-term (reference) 3F103 AA05 BA01 BA12 BC17 EA15

Claims (5)

[Claims] 1. A plurality of transport table rollers having an annular groove for endless belt guide in an outer peripheral direction, and a cooling fluid for spraying a cooling fluid to a lower surface of a hot-rolled steel strip after finish rolling between the transport table rollers. A cooling means, an endless belt whose part in the longitudinal direction of the belt is guided into each annular groove of the plurality of transport table rollers along the longitudinal direction of the upper surface of the hot run table, and the part in the longitudinal direction of the endless belt. A guide device for guiding the inside of each annular groove of the plurality of table rollers and guiding the other part of the endless belt in the longitudinal direction to the outside of the hot run table. table. 2. The endless belt guided in the annular groove on the upper surface of the hot run table, wherein the depth a of the annular groove formed on the conveying table roller and the thickness b of the endless belt satisfy a> b. The hot run table for hot rolled steel strip conveyance according to claim 1, wherein an upper surface of the hot run steel strip conveyance is located below an upper surface of a conveyance table roller constituting a material conveyance surface. 3. The hot-rolled steel strip according to claim 1, comprising two or more endless belts, and the transport table roller having two or more annular grooves for guiding the endless belt. Hot run table for transportation. 4. The hot run table for transporting a hot-rolled steel strip according to claim 1, further comprising a tension control device for controlling the tension of the endless belt. 5. A plurality of table roller groups comprising a plurality of adjacent transport table rollers and sharing at least one endless belt, wherein the adjacent table roller groups share one transport table roller. The hot run table for transporting a hot-rolled steel strip according to any one of claims 1 to 4, characterized in that: