JP6003499B2 - Steel plate transport device and method for suppressing water generation on steel plate - Google Patents

Description

  The present invention relates to a steel plate transport device and a method for suppressing the occurrence of water on a steel plate.

  In general, in a steel plate (strip) processing line such as a hot rolling line, a number of pinch rolls for conveying the steel plate are installed, for example, just before a hot strip winder. And since this kind of pair of upper and lower pinch rolls needs to move the roll up and down according to the plate thickness of the steel sheet, the lower pinch roll positioned below the steel sheet and the roll are positioned, and And an upper pinch roll that can be moved up and down with respect to the lower pinch roll by a reduction device for applying a reduction load. That is, the roll chock is mounted on a roll hanger or the like housed in the housing so that the roll chock can be moved up and down, and a force is applied to the steel sheet by the rolling device via the roll chock. In addition, there are cases where a roll is driven to convey a steel plate.

  When transporting a steel sheet with such a pair of upper and lower pinch rolls, the gap between the upper pinch roll and the lower pinch roll, that is, the gap between the rolls, is usually in accordance with the thickness of the steel sheet by operating the reduction device. The upper pinch roll is rotationally driven while maintaining a predetermined value. In this case, there is a gap between the connecting portion between the reduction device and the upper pinch roll, between the upper pinch roll and the bearing, and so on. Therefore, even if the upper pinch roll is moved by a predetermined distance by the reduction device so as to maintain the gap between rolls at a predetermined value, the gap between the rolls fluctuates due to the gap described above.

  For this reason, conventionally, the pair of upper and lower pinch rolls has been provided with a gap holding mechanism for maintaining a gap between the upper pinch roll and the lower pinch roll at a predetermined value. As a conventional technique of a pair of upper and lower pinch rolls provided with an inter-gap holding mechanism, one disclosed in Patent Document 1 is known. The conventional pair of upper and lower pinch rolls described in Patent Document 1 includes a lower pinch roll positioned below the steel plate and an upper pinch roll that can be moved up and down relative to the lower pinch roll. The upper pinch roll is supported by a roll chock so as to be rotatable. The roll chock is fitted to the support member so as to be detachable, and the support member is connected to a reduction device fixed to the upper part of the housing via a connection pin. A spring is attached to the upper part of the housing, and the spring pushes the support member upward through a rod. On the other hand, both ends of the shaft of the upper pinch roll are supported so as to be rotated by an auxiliary roll chock. The auxiliary roll chock is suspended from the roll chock and is slidable in the vertical direction. That is, a spring is interposed between the roll chock and the auxiliary roll chock, and this spring supports the auxiliary roll chock so as to push it upward. In the pair of upper and lower pinch rolls configured in this way, the support member and the like are pulled upward by the spring provided in the upper portion of the housing, so that the gap at the connecting portion between the support member and the reduction device is eliminated, Since the auxiliary roll chock is pushed upward by the spring provided between the roll chock and the auxiliary roll chock, the clearance between the bearing in the roll chock and the shaft upper surface side of the upper pinch roll, and between the bearing in the auxiliary roll chock and the upper pinch roll The gap with the shaft lower surface side is eliminated.

  As described above, according to the technique described in Patent Document 1, the gap between the coupling portion and the bearing portion is eliminated, and the gap between rolls can be prevented and the gap between rolls can be accurately set. In the case where a steel plate cooling device or the like is installed in the vicinity of the outlet side, there are the following problems.

  In the following, description will be made with reference to FIG. 4 showing an example of the main member configuration centered on the roll chock. In an apparatus (steel sheet conveying apparatus) for conveying a steel plate 7 provided with a pair of upper and lower pinch rolls 11 and 12, the position of the upper pinch roll 11 is adjusted by a jack 13 and / or a cylinder 14 in accordance with the thickness of the passing steel sheet 7. When the gap between the rolls is adjusted so as to exceed the plate thickness of the steel plate 7, for example, in the hot rolling line, the (A) side steel plate 7 by the cooling water 6 ejected from the cooling water nozzle 5 installed on the (B) side. On top of this, riding water (retained cooling water) 8 is generated. That is, when the position of the upper pinch roll 11 is adjusted so that the gap between the rolls matches the plate thickness of the steel sheet and becomes slightly wide, the cooling water enters the (A) side from the gap between the steel sheet and the upper pinch roll. As a result, boarding water (retained cooling water) 8 is generated on the steel plate 7, and the boarding water evaporates, scatters or falls, causing the electrical equipment on the (A) side to malfunction. Therefore, a technique (steel plate conveying device) that does not cause any particular problems even if the gap between rolls is set to be narrower than the plate thickness of the steel plate has been desired so as to suppress the occurrence of boarding water (retained cooling water).

JP 09-182914 A

  However, in the steel plate conveying apparatus having a pair of upper and lower pinch rolls according to the prior art, there is a problem that mechanical damage is caused by the biting force of the steel plate when the gap between the rolls is narrow. That is, when the gap between the rolls is made smaller than the plate thickness of the steel plate, impact due to the biting force of the steel plate occurs, and the roll chock and / or the hydraulic system of the jack and the cylinder, the pneumatic system, etc. are damaged, There was a problem that the gap between the rolls had to be widened, and the electric water or the like on the (A) side was damaged by the water (retained cooling water) 8 generated as a result.

  The present invention has been made as a result of intensive studies to solve the above-mentioned problems, and has a mechanism for absorbing and mitigating the impact on the upper pinch roll (positioning roll). It is a dredging transport device and a method for suppressing the occurrence of water on the steel plate.

  The steel sheet conveying apparatus according to the present invention includes a pair of upper and lower pinch rolls provided with a reduction device, an upper and lower roll chock that rotatably supports a shaft portion of the pair of upper and lower pinch rolls, and a roll between the pair of upper and lower pinch rolls. A jack that holds a gap at a predetermined value, a cylinder for connecting and fixing disposed between the jack and the roll chock, and an impact generated when the steel plate is transported connected to the upper end of the jack. And a roll hanger having a mechanism for relaxing.

  The roll hanger is connected to the reduction device via a spring at an upper end, and the roll hanger is divided into two parts, and a member can be opened in a U shape around a pin provided at the top, and the roll hanger It is preferable that the shape of the contact surface of the roll chock is tapered and a spring is interposed between the bottom of the roll hanger and the roll chock.

  Furthermore, it is preferable that the mechanism for reducing the impact is a cylinder.

  Moreover, the method for suppressing the occurrence of water on the steel sheet according to the present invention is characterized in that, in the steel sheet transporting apparatus, the gap between the rolls of the pinch roll before reaching the tip of the steel sheet is set to be equal to or less than the plate thickness of the steel sheet.

  According to the present invention, it is possible to suppress mechanical breakage of the cylinder, jack or roll chock while keeping the gap between the surface of each roll and the steel plate surface at a predetermined value so as not to generate riding water (retained cooling water). There exists an effect that the apparatus failure in a steel plate conveyance apparatus can be suppressed. In particular, when applied to a pinch roll installed immediately before a hot strip winder (hot rolling mill), there is an effect that it is possible to suppress device failures including failures of electrical facilities and the like.

It is a side view which shows the steel plate conveying apparatus by embodiment of this invention. It is a side view which shows the detail of the impact mitigation mechanism in the roll hanger part of the steel plate conveying apparatus by embodiment of this invention. It is a side view which shows the steel plate conveying apparatus by other embodiment of this invention. It is a side view which shows an example of the steel plate conveying apparatus by a prior art.

  Hereinafter, preferred embodiments of a steel sheet conveying apparatus according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic explanatory diagram of an embodiment of a steel sheet conveying apparatus according to the present invention (functions, that is, drawings that are described mainly with a pinch roll gap holding mechanism and an impact mitigating mechanism). In the steel plate transport apparatus 1 employing the pinch roll gap-to-roll gap holding mechanism and the impact mitigating mechanism, the upper and lower pinch rolls 11 and 12 have upper and lower roll chocks (upper roll chock 4 that are rotatable via bearings, for example). The roll chock 4 is mounted on the jack 13 so as to be movable up and down. A connecting and fixing cylinder 14 is disposed between the jack 13 and the roll chock 4 and is built in the roll hanger 3. The cylinder 14 is not particularly limited, and a hydraulic cylinder or a pneumatic cylinder can be employed. On the other hand, the upper end of the jack 13 is fixed to the roll hanger 3. The roll hanger 3 is divided into two parts, and the roll hanger (3a, 3b) is configured to be rotatable around the upper pin 21. The roll hanger 3 is connected to the lowering device 2 via a spring 22 at the upper end, whereby the rolling force applied to the steel sheet by the lowering device 2 is transmitted to the upper pinch roll 11 via the roll chock 4 and the connecting and fixing cylinder 14. The The shape of the contact surface 31 between the roll hanger 3 and the roll chock 4 is tapered, and a reed spring 24 is interposed between the bottom of the roll hanger 3 and the roll chock 4.

  In this way, when the gap between the rolls is set to a predetermined value, when the steel plate 7 is engaged, the members 3a and 3b constituting the roll hanger 3 are opened in a U-shape as illustrated in FIG. The rolls move while opening the gap between the rolls while mitigating the impact caused by the biting, and the biting force generated when the steel plate 7 and the upper pinch roll 11 collide is absorbed by the spring 22 and / or the coupling fixing cylinder 14. can do. Accordingly, the roll chock 4, the jack 13, or the hydraulic system or pneumatic system of the connecting and fixing cylinder 14 can be prevented from being damaged, while the roll chock 4 is pressed in the vertically downward direction by the spring 22 and the spring spring 24. Therefore, the gap between the surface of each roll and the steel plate surface can be eliminated. The predetermined value is preferably −10 to −0.1 mm from the plate thickness in a general hot rolling line.

  FIG. 3 is a schematic functional explanatory diagram of another embodiment of the steel plate conveying apparatus of the present invention (similar to the above, a drawing that is explained mainly with the pinch rolls 11 and 12 between the roll holding mechanism and the impact mitigating mechanism). It is. In this embodiment, when connecting the upper part of the roll hanger and the reduction device, an impact absorbing cylinder 23 is employed instead of the spring 22 of FIG. Similarly to the above-described embodiment, when the steel plate is bitten, the members 3a and 3b constituting the roll hanger are opened in a U-shape as illustrated in FIG. 2 to alleviate the impact caused by the biting of the steel plate 7. While moving so as to open the gap between the rolls, the biting force generated when the steel plate 7 and the upper roll collide can be absorbed by the two cylinders. Accordingly, the roll chock 4, the jack 13, or the hydraulic system or the pneumatic system of the coupling fixing cylinder 14 can be prevented from being damaged, while the roll chock 4 is pressed in the vertically downward direction by the spring 24. It is possible to eliminate a gap between the roll surface and the steel plate surface during sheet passing. The predetermined value is preferably −10 to −0.1 mm from the plate thickness in a general hot rolling line.

  Therefore, the gap between the rolls of the pinch roll before reaching the front end of the steel sheet can be set to be equal to or less than the thickness of the steel sheet by the steel sheet conveying device, and the gap between the surface of each roll and the steel sheet surface in the through plate is predetermined. Since the value can be maintained, it is possible to suppress the occurrence of boarding water that causes a failure of the electrical equipment.

DESCRIPTION OF SYMBOLS 1 Steel plate conveying apparatus 2 Rolling-down apparatus 3 Roll hanger 4 Roll chock (equivalent to a roll bearing box)
5 Cooling water nozzle 6 Cooling water 7 Steel plate (strip)
8 Boarding water (Stagnant cooling water)
DESCRIPTION OF SYMBOLS 11 Upper pinch roll 12 Lower pinch roll 13 Jack 14 Connection fixing cylinder 21 Pin 22 Spring 23 Shock absorption cylinder 24 Belleville spring 31 Contact surface (between roll hanger 3 and roll chock 4)

Claims (4)

A pair of upper and lower pinch rolls equipped with a reduction device;
An upper and lower roll chock that rotatably supports a shaft portion of the pair of upper and lower pinch rolls;
A jack provided for the upper pinch roll, which holds a gap between rolls of the pair of upper and lower pinch rolls at a predetermined value;
A cylinder for connecting and fixing disposed between the jack and the upper roll chock;
A steel plate transport apparatus comprising: a roll hanger connected to an upper end portion of the jack and having a mechanism for reducing an impact generated during transport of the steel plate. The roll hanger is connected to the reduction device via a spring at the upper end of the roll hanger, and the roll hanger is divided into two parts so that a member can be opened in a square shape around a pin provided on the top. The steel plate conveying apparatus according to claim 1, wherein the shape of the contact surface of the roll chock is tapered, and a spring spring is interposed between the bottom of the roll hanger and the roll chock.   The steel plate transport apparatus according to claim 1 or 2, wherein the mechanism for reducing the impact is a cylinder.   4. The method for suppressing the occurrence of boarding water according to claim 1, wherein a gap between rolls of a pinch roll before reaching the tip of the steel sheet is set to be equal to or less than a thickness of the steel sheet.

Images