JP2006068793A - On-line accelerated cooling apparatus for rolled stock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-line accelerated cooling apparatus capable of uniformly cooling the upper and back surfaces of a hot-rolled rolled stock and also preventing temperatures thereof from being deviated even in a longitudinal direction. <P>SOLUTION: The on-line accelerated cooling apparatus is provided with a vertically following-up means 16 for following up the vertical behavior of the back surface of the rolled stock W to table rolls 11A, 11B arranged in a dewatering position of cooling water in a cooling chamber. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an on-line accelerated cooling apparatus for cooling a rolled material that has been hot-rolled and being conveyed on a conveying line online with cooling water.

As a method for cooling a rolled material after hot rolling online, an accelerated cooling method employing a slit jet cooling device is known (see, for example, Patent Document 1 and Patent Document 2).
The slit jet cooling device includes an upper slit jet nozzle that blows cooling water toward the upper surface of the rolled material traveling on the conveying line, an upper draining roll provided at a predetermined interval in the downstream direction, and the rolled material. The lower slit jet nozzle which blows cooling water toward the lower surface of the nozzle and the lower draining roll provided at a predetermined interval in the downstream direction.

The cooling water sprayed from the upper slit jet nozzle to the upper surface of the rolled material once flows on the upper surface of the steel sheet and goes downstream, and is dammed on the upper surface side of the steel sheet by the upper draining roll to generate a stirring flow while generating a stirring flow. Spills from both sides of the width. Similarly, the cooling water sprayed from the lower slit jet nozzle to the lower surface of the rolled material once flows along the lower surface of the steel plate, and is dammed on the lower surface side of the steel plate by the lower draining roll. It will move away from the rolled material and cause a drop.
JP-A-62-289315 (first page to third page, FIG. 1) Japanese Patent Application Laid-Open No. 11-169941 (pages 11 to 13, FIG. 3)

In many cases, the slit jet cooling device allows the upper draining roll to move up and down freely as a countermeasure when warping has occurred in the rolled material. It is supposed to be. This prevents a gap from being generated between the upper draining roll and the rolled material, thereby preventing leakage of cooling water.
However, since the lower draining roll is usually used also by the table roll forming the conveying line, the lower draining roll (table roll) is not lifted (fixed height).

For this reason, when warping has occurred in the rolled material, a gap is generated between the rolled material and the lower draining roll, and cooling water flows into the next cooling bank (cooling water leaks). As the film thickness decreased, the cooling capacity was greatly changed.
In some cases, a pre-leveler was installed on the upstream side of the slit jet cooling device to improve the flatness of the steel sheet. However, when the thickness of the rolled material is relatively thin, the rate of occurrence and degree of warpage are high. Therefore, even after passing through the pre-leveler, although it is reduced to some extent, warping still remains (around 10 mm).

Therefore, leakage of cooling water from the gap formed between the lower draining roll (table roll) and the rolled material is an important improvement issue.
The present invention has been made in view of the above circumstances, and the upper surface and the lower surface of the hot-rolled rolled material are made uniform to each other so that no temperature deviation occurs even in the longitudinal direction thereof. An object of the present invention is to provide an on-line accelerated cooling device for rolled material.

In order to achieve the above object, the present invention has taken the following measures.
Further, the technical means for solving the problems in the present invention is an on-line acceleration in which a hot-rolled rolled material is nipped by an upper draining roll and a lower draining roll and the rolling material is conveyed while draining cooling water. In the cooling device, the lower draining roll is provided with an upper and lower follower for causing the lower draining roll to follow the vertical behavior of the lower surface of the rolled material.
Further, the technical means for solving the problems in the present invention includes a rolled material that is provided in a middle portion of a conveyance line in which a plurality of table rolls are arranged side by side, and is being hot-rolled and conveyed by the conveyance line. In the on-line accelerated cooling system for rolled material having a cooling chamber that is cooled by cooling water, the table roll follows the up-and-down behavior of the lower surface of the rolled material on the table roll disposed at the draining position for cooling water in the transfer line. An up-and-down follow-up means is provided.

Thus, if it is the structure which moves the table roll (namely, lower draining roll) distribute | arranged to the draining position for cooling water by an up-and-down following means, a clearance gap will generate | occur | produce between this table roll and a rolling material. Can be prevented. Therefore, leakage of the cooling water can be prevented, the upper surface and the lower surface of the rolled material can be uniformly cooled with each other, and temperature deviation can be prevented from occurring in the longitudinal direction thereof.
It should be noted that the present invention is particularly useful when a pre-leveler is installed upstream of the cooling chamber so as to adjust (improve) the flatness of the rolled material in advance.

Preferably, the vertical follow-up means has an elevating drive device that raises and lowers the table roll in the vertical direction until the support pressure of the table roll with respect to the rolled material reaches a predetermined pressure, or biasing the table roll upward It is good to have a means.
Preferably, the on-line accelerated cooling device according to the present invention may be configured as a slit jet cooling device. The slit jet cooling device includes an upper slit jet nozzle that blows cooling water toward the upper surface of the rolled material in the cooling chamber and an upper draining roll provided at a predetermined interval in the downstream direction of the rolled material. This means that a lower slit jet nozzle for blowing cooling water toward the lower surface and a lower draining roll provided at a predetermined interval in the downstream direction are provided.

  In such a slit jet cooling apparatus, a very beneficial effect is exhibited.

  According to the on-line accelerated cooling device for rolled material according to the present invention, the upper surface and the lower surface of the hot-rolled rolled material can be made uniform with each other while further preventing temperature deviation in the longitudinal direction. .

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a first embodiment of an online accelerated cooling apparatus 1 according to the present invention. This on-line accelerated cooling device 1 cools the rolled material W conveyed on the conveying line 2 after hot rolling with cooling water while running it into the cooling chamber. In the illustrated example, the slit jet cooling device is applied. It is.
Therefore, the online accelerated cooling apparatus 1 has an upper slit jet nozzle 6 that blows cooling water toward the upper surface of the rolled material W and a lower slit jet nozzle 7 that blows cooling water toward the lower surface of the rolled material W. ing. The upper and lower slit jet nozzles 6 and 7 are opposed to each other with the rolled material W interposed therebetween.

On the downstream side of the upper slit jet nozzle 6, an upper draining roll 10A is provided at a predetermined interval. An upper draining roll 10B is also provided immediately upstream of the upper slit jet nozzle 6.
The transport line 2 has a plurality of table rolls 11 arranged side by side at a predetermined interval. Among them, the arrangement interval of the table rolls 11 is separated by a predetermined distance in the cooling device 2. The table rolls 11 on both sides of this section are positioned so as to face the above-described upper draining rolls 10A and 10B. In this way, the two table rolls 11 (11A, 11B) that are vertically opposed to the upper draining rolls 10A, 10B also function as lower draining rolls.

An upper guide plate 12 is provided between the upper slit jet nozzle 6 and the upper draining roll 10 </ b> A on the downstream side thereof so as to be at a substantially constant interval from the upper surface of the rolled material W. Similarly, a lower guide plate 13 is provided between the lower slit jet nozzle 7 and the lower draining roll 11A on the downstream side thereof so as to have a substantially constant distance from the lower surface of the rolled material W.
For these reasons, the cooling water sprayed from the upper slit jet nozzle 6 onto the upper surface of the rolled material W once flows on the upper surface of the rolled material W and goes downstream, and the upper water draining roll 10A on the downstream side makes the upper surface of the rolled material W side. In this case, the dams are spilled from both sides in the width direction of the rolled material W while generating a stirring flow.

Here, the upper guide plate 12 is cut off from the upper surface of the rolled material W by the surplus portion of the cooling water that is blocked by the upper draining roll 10A and causes a stirring flow. There is an effect of restricting to a predetermined value.
Similarly, the cooling water sprayed from the lower slit jet nozzle 7 to the lower surface of the rolled material W once flows along the lower surface of the rolled material W, and is dammed on the lower surface side of the rolled material W by the lower draining roll 11A on the downstream side. It comes to be stopped, it leaves | separates from the rolling material W, producing a stirring flow here, and comes to fall.

Here, the lower guide plate 13 keeps the cooling water flow along the lower surface of the rolled material W to a certain degree of water retention (prevents water from immediately falling from the lower surface of the rolled material W) and is blocked by the lower draining roll 11A. Of the cooling water that causes the stirring flow, an excess portion is cut off from the lower surface of the rolled material W, and as a result, the amount of cooling water that contacts the lower surface of the rolled material W is regulated to a predetermined value.
From these things, the contact state of the cooling water between the upper and lower surfaces of the rolled material W becomes substantially equal, and the upper surface and the lower surface of the rolled material W are uniformly cooled.
The upper water draining rolls 10A and 10B are provided with upper vertical follower means 15, and the upper water draining rolls 10A and 10B can be moved up and down by the upper vertical water follower means 15, respectively. Correspondingly, the lower draining rolls 11A, 11B are provided with lower vertical follower means 16, and the lower draining rolls 11A, 11B can also be moved up and down by the lower vertical follower means 16, respectively.

The lower vertical follow-up means 16 includes an elevating drive device 20. This elevating drive device 20 uses, for example, a fluid pressure cylinder 21 such as a single-acting hydraulic cylinder so that its telescopic rod 22 extends upward and downward to support the lower draining rolls 11A and 11B on its upper end side. Is. The telescopic rod 22 is driven to extend (raise) or freely contract (lower) by a hydraulic circuit (not shown).
The fluid pressure cylinder 21 is set so that the upper surfaces of the lower draining rolls 11A and 11B are at the same level as or lower than the transport support level of the transport line 2 when the telescopic rod 22 contracts most. . That is, the lower draining rolls 11 </ b> A and 11 </ b> B are pressed down on the rolled material W within a predetermined range while moving up and down following the up-and-down behavior of the lower surface of the rolled material W caused by the warp generated in the rolled material W.

This hydraulic circuit is provided with a sensor 23 for detecting the lower surface level of the rolled material W on the upstream side of the lower slit jet nozzle 7, preferably on the further upstream side of the lower draining roll 11 </ b> B arranged upstream. Based on the detection signal from the sensor 23, the hydraulic pressure for driving extension is supplied to the fluid pressure cylinder 21.
The hydraulic circuit is provided with pressure detecting means (not shown) such as an oil level gauge so that the load pressure acting on the telescopic rod 22 can be detected, and by limiting the detected load pressure to a predetermined value. The support pressure of the lower draining rolls 11A and 11B with respect to the rolled material W is maintained within a predetermined range, and it is possible to prevent the rolled material W from being incurred with defects such as scratches, dents and bends. In addition, when this load pressure is sensed and the load pressure decreases sharply, the lower surface of the rolled material W and the table roll 11A are separated from each other and a telescopic rod 22 is projected so as to eliminate such a gap. You may make it make it.

The upper vertical follow-up means 15 has a fast-forward mechanism 30 and a lift drive device 31. The raising / lowering drive device 31 is substantially the same in structure, except that the vertical relationship with the lower vertical follow-up means 16 is reversed. That is, the fluid pressure cylinder 32 is used so that the telescopic rod 33 extends and contracts downward to support the upper draining rolls 10A and 10B on the lower end side. The telescopic rod 33 is driven to extend (lower) or freely contract (up) by a hydraulic circuit (not shown).
Therefore, the upper draining rolls 10 </ b> A and 10 </ b> B are pressed down on the rolled material W within a predetermined range while moving up and down following the up and down behavior of the upper surface of the rolled material W caused by the warp generated in the rolled material W.

The rapid feed mechanism 30 is formed by appropriate driving tools and mechanisms such as a ball screw, a fluid pressure cylinder, a winding transmission, a link mechanism, and the like, and moves the fluid pressure cylinder 32 of the elevating drive device 31 up and down as it is. Yes.
In the on-line accelerated cooling apparatus 1 of the first embodiment having such a configuration, after the hot rolling, the rolled material W that has been subjected to flatness adjustment (improvement) by a pre-leveler in advance is conveyed to the rolled material W. When transported into the cooling chamber of the online accelerated cooling device 1 by the line 2, the upper draining rolls 10 </ b> A and 10 </ b> B that have been in the upper standby state until then are predetermined by the operation of the fast feed mechanism 30 of the upper vertical follow-up means 15. To a position (for example, a rolled material thickness of -5 mm), and is substantially in contact with the upper surface of the rolled material W.

Further, at this time, the rolling material W is naturally in contact with the lower surface of the rolling material W, with the lower draining rolls 11A and 11B also serving as the table roll 11 forming the transport line 2.
In this way, the rolled material W is blown out from the upper slit jet nozzle 6 and the lower slit jet nozzle 7 while being conveyed in the cooling chamber in a manner sandwiched between the upper and lower draining rolls 10A and 10B and the lower draining rolls 11A and 11B. Although cooling is performed by the cooling water, it is assumed here that, for example, as shown in FIG. 1 (B), the rolled material W has a warp 50 that rises like a mountain.

  In this case, the fluid pressure cylinder 32 (fluid damper) provided in the lift drive device 31 of the upper vertical follow-up means 15 works as follows. That is, when the first upward slope 51a on the upper surface side of the warp 50 of the rolled material W has progressed, the telescopic rod 33 freely contracts into the fluid pressure cylinder 32 along the slope, and the upper draining rolls 10A and 10B. Rises while maintaining a predetermined rolling load with respect to the rising slope 51a. Thereafter, the telescopic rod 33 extends freely following the downward slope 51b of the warp 50, and the upper draining rolls 10A, 10B descend while holding a predetermined reduction load with respect to the downward inclination 51b, and always the upper draining roll 10A. , 10B moves up and down in contact with the upper surface of the rolled material W.

  On the other hand, with respect to the raising / lowering drive device 20 of the lower vertical follow-up means 16, by controlling the fluid pressure cylinder 21, the telescopic rod 22 is extended following the upward slope 52a on the lower surface side of the warp 50, and the lower draining roll 11A, 11B is raised and raised in a state of being substantially in contact with the slope 52a. Thereafter, the telescopic rod 22 is controlled and contracted following the downward slope 52b of the warp 50, thereby lowering the lower draining rolls 11A and 11B so as to substantially contact the downward slope 52b. That is, the lower water draining rolls 11A and 11B are moved up and down by controlling and driving the fluid pressure cylinder 21.

Thus, even when the warp 50 is generated in the rolled material W, not only between the upper draining rolls 10A and 10B and the rolled material W, but also between the lower draining rolls 11A and 11B and the rolled material W. However, it is possible to prevent gaps from occurring. Therefore, leakage of the cooling water can be prevented, and the rolled material W is supplied with the cooling water under the same conditions regardless of whether it is the upper surface or the lower surface of the rolled material W, so that the same stirring state is obtained.
Therefore, the hot-rolled rolled material W is uniformly cooled on the upper surface and the lower surface, and no temperature deviation occurs in the longitudinal direction of the upper surface and the longitudinal direction of the lower surface.

FIG. 2 shows a second embodiment of the online accelerated cooling device 1 according to the present invention. The online accelerated cooling device 1 of the second embodiment is most different from the first embodiment in that the lower vertical follow-up means 16 has a biasing means 60 (spring) that generates a rising biasing force. In the point. That is, since the elevating drive device 20 employed in the first embodiment is not required, the lower vertical follow-up means 16 does not require a hydraulic circuit and has a very simple configuration.
The spring 60 is set so that the upper surface of each roll floats slightly (about 10 mm or less) from the transport support level of the transport line 2 when the lower draining rolls 11A and 11B are not subjected to the load from the rolled material W. It is preferable to leave.

Other configurations and operational effects are substantially the same as those of the first embodiment.
By the way, this invention is not limited to each above-mentioned embodiment, It can change suitably according to embodiment.
For example, the lower vertical follow-up means 16 may be provided only for the lower draining roll 11 </ b> A on the downstream side of at least the lower slit jet nozzle 7.
In the first embodiment, the fluid pressure cylinder 21 employed in the lifting drive device 20 of the lower vertical follow-up means 16 may be other than hydraulic (water pressure, air pressure, etc.). Instead of the fluid pressure cylinder 21, a motor-driven mechanical type may be used.

In the second embodiment, the biasing means 60 of the lower vertical follow-up means 16 may employ a fluid spring (such as an air spring) in addition to a coil spring or a leaf spring.
In both the first embodiment and the second embodiment, one of the table rolls 11 is used as a draining roll and is movable up and down so as to be in contact with the lower surface of the rolled material W, but separately from the table roll 11A There is no problem even if a draining roll is provided and the draining roll is movable up and down. That is, it is preferable that the vertically following means 16 is provided in a draining roll provided separately.

It is the side view which showed 1st Embodiment of the online accelerated cooling device which concerns on this invention, Comprising: (A) is before operation | movement, (B) is at the time of operation | movement. It is the side view which showed 2nd Embodiment of the online accelerated cooling device which concerns on this invention, Comprising: (A) is before operation | movement, (B) is at the time of operation | movement.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Online acceleration cooling apparatus 2 Conveyance line 6 Upper slit jet nozzle 7 Lower slit jet nozzle 10A Upper draining roll 10B Upper draining roll 11 Table roll 11A Lower draining roll 11B Lower draining roll 16 Vertical follow-up means 20 Lifting drive apparatus 60 Energizing means

Claims (5)

In an on-line accelerated cooling device that conveys the rolled material (W) while holding the hot-rolled rolled material (W) between the upper draining roll (10A) and the lower draining roll (11A) and draining the cooling water. ,
The lower draining roll (11A) is provided with vertical follower means (16) for causing the lower draining roll (11A) to follow the vertical behavior of the lower surface of the rolled material (W). Online accelerated cooling system. The rolling material (W) during hot rolling, which is provided in the middle of the conveyance line (2) in which a plurality of table rolls (11) are arranged side by side, and is conveyed by the conveyance line (2) is cooled with cooling water. In an on-line accelerated cooling device for rolled material having a cooling chamber for cooling,
The table roll (11A) arranged at the draining position for cooling water in the transport line (2) has a vertical follower for causing the table roll (11A) to follow the vertical behavior of the lower surface of the rolled material (W). (16) is provided, The on-line accelerated cooling apparatus of the rolling material characterized by the above-mentioned.   The up-and-down following means (16) has an elevating drive device (20) that elevates and lowers the table roll (11A) up and down until the support pressure of the table roll (11A) with respect to the rolled material (W) reaches a predetermined pressure. The on-line accelerated cooling device for rolled material according to claim 1 or 2, characterized in that   The on-line acceleration of the rolling material according to claim 1 or 2, wherein the vertical follow-up means (16) has a biasing means (60) for biasing the table roll (11A) upward. Cooling system.   The cooling chamber has an upper slit jet nozzle (6) for blowing cooling water toward the upper surface of the rolled material (W) and an upper draining roll (10A) provided at a predetermined interval in the downstream direction, A slit jet cooling device comprising a lower slit jet nozzle (7) for blowing cooling water toward the lower surface of the rolled material (W) and a lower draining roll (11A) provided at a predetermined interval in the downstream direction. It is comprised as follows. The online accelerated cooling apparatus of the rolling material in any one of Claims 1-4 characterized by the above-mentioned.

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