JP5807616B2 - Looper device - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a looper device installed between rolling stands of a hot finishing mill composed of a plurality of rolling stands, and more specifically, sprays cooling water onto the back surface of a hot rolled steel sheet rolled by the hot finishing mill. The present invention relates to a looper device having a function to perform.

When manufacturing a hot-rolled steel sheet by hot rolling, iron oxide (mainly Fe0, Fe ₂ O ₃ ) is generated on the surface of the hot-rolled steel sheet in the process of rolling at a high temperature of about 1000 ° C. When the generated iron oxide is peeled off at the former stage rolling stand of the hot finishing rolling mill constituted by a plurality of rolling stands, it will be press-fitted onto the surface of the hot rolled steel sheet at the next stage rolling stand, and Occur.

  As a method of suppressing the scale wrinkling of this hot rolled steel sheet, the surface of the steel sheet is covered by spraying cooling water on the steel sheet between the rolling stands of the hot finishing mill (especially the pre-rolling stand where the temperature of the steel sheet is high). There is a way to suppress it. Regarding the steel plate surface (upper surface), the sprayed cooling water covers the steel plate surface as water on the plate, so it is possible to suppress the scale with the cooling spray between existing rolling stands. The injected cooling water rebounds immediately and there is no water on the plate, so an additional cooling device is required to suppress scale defects on the back of the steel plate. However, there are a looper device and a side guide device that suppresses meandering between the rolling stands, and it is difficult to add more cooling devices.

  For example, Patent Document 1 includes a cooling water injection unit that injects cooling water to the back surface of the steel plate in the steel plate width direction of the looper roller frame that is pivotally supported between the hot finishing mill stands. A steel plate cooler between hot finish mill stands is disclosed. The cooling water jetting means has a plane rectangular opening that is long in the width direction of the frame on the upper and lower surfaces of the looper roller frame, and a plurality of headers are integrally fixed in the width direction of the frame.

  In each header, a perforated plate orthogonal to the flow direction of the cooling water and a guide plate for guiding the cooling water are provided. A flexible tube is connected to the lower end of each header, and each flexible tube is connected to a cooling water supply tube. A swing plate pivotally supported on the upstream side of the upper opening of the frame is provided. The swing plate is supplied with cooling water to the header, and is rotated obliquely upward by the pressure of the cooling water that passes through the perforated plate and the guide plate. The upper opening is opened, and the cooling water that is discharged from the upper opening is supplied to the steel plate. It sprays in the downstream diagonal direction with respect to the back surface. When there is no cooling water supplied to the header, the upper opening is closed.

Japanese Utility Model Publication No. 61-58913

  In the steel plate cooler described in Patent Document 1, since cooling water is discharged directly from the upper opening of the frame toward the back surface of the steel plate, a large amount of cooling water is required to cover the steel plate back surface. Therefore, the cooling water pipe becomes large, and the number of flexible pipes that supply cooling water from the cooling water supply pipe to each header increases. As a result, the steel plate cooler attached to the looper device becomes large and increases in weight, which hinders the original operation of the looper device.

  Further, since the cooling water has a structure for lifting the swing plate provided in the upper opening of the frame, the durability of the swing plate becomes a problem. Furthermore, since the cooling water is discharged in a state where the swing plate provided in the upper opening of the frame is lifted, it is difficult to maintain a uniform amount of cooling water sprayed on the back surface of the steel plate, and a desired cooling state is obtained. This is difficult, and there is a concern of quality abnormalities on the back side of the steel sheet.

  Moreover, in this steel plate cooler, a flat rectangular opening that is long in the steel plate width direction of the looper roller frame is perforated, and a plurality of headers are only provided in a row in the steel plate width direction of this frame. There is a problem that it is difficult to spray over the back surface in a wide range, and it is difficult to suppress oxidation on the back surface of the steel sheet.

  Therefore, in the present invention, to provide a looper device having a function of jetting cooling water to the back surface of the steel plate, which can cool the back surface of the steel plate uniformly over a wide range without affecting the original operation of the looper device. With the goal.

  The looper device of the present invention is a looper device installed between the rolling stands of a hot finishing rolling mill composed of a plurality of rolling stands, wherein the water tank formed on the frame of the looper device, and the steel plate traveling direction of the looper device And a plurality of spray nozzles that are arranged side by side in the width direction of the steel plate and are respectively connected to the water tank unit and inject cooling water upward of the looper device.

  The looper device of the present invention includes a flexible hose between a water supply pipe and a water tank part for supplying cooling water to the water tank part, and the water supply pipe, the water tank part and the flexible hose are parallel to the rotation axis of the looper device. It is desirable that they are respectively connected by a swivel joint having a rotating shaft.

Further, the spray nozzles are arranged such that the inclination angles of the plurality of spray nozzles are 0 to 20 ° from the vertical direction to the steel plate traveling direction when the upper surface of the frame is in a horizontal state , and are arranged downstream of the steel plate traveling direction. Is characterized in that the inclination angle is gradually larger than the inclination angle of the spray nozzle arranged on the upstream side in the steel plate traveling direction .

  Moreover, it is desirable for the plurality of spray nozzles to continuously discharge a small amount of cooling water even when the steel plate is not flowing.

  According to the looper device of the present invention, the frame itself of the looper device is used as a water tank portion, and the cooling water in the water tank portion is sprayed upward from the plurality of spray nozzles arranged side by side in the steel plate traveling direction and the steel plate width direction. Therefore, the steel plate back surface can be uniformly cooled over a wide range, and oxidation of the steel plate back surface can be suppressed to obtain a high-quality product. In addition, since the spray nozzle is used, only a small amount of cooling water is supplied to the aquarium, and the cooling water piping is small, which can prevent the weight of the looper device from increasing, affecting the original operation of the looper device. Will not affect.

  A flexible hose is provided between the water supply pipe for supplying cooling water to the water tank section and the water tank section. Thus, the load on the looper device during the rotation of the looper device can be reduced.

  A plurality of spray nozzles can be inclined from 0 to 20 ° in the steel plate traveling direction from the vertical direction, so that the spray area of cooling water sprayed from the spray nozzles at the standby position of the looper device is widened. By adjusting, it is possible to efficiently cool the front end of the steel plate where the occurrence of quality abnormality is remarkable, and to obtain a high-quality product.

  Since multiple spray nozzles continue to discharge a small amount of cooling water even when the steel plate is not flowing, it becomes possible to prevent foreign matter from entering from the tip of the spray nozzle when the steel plate is not flowing. In addition, an opening / closing mechanism such as a conventional swing plate is not necessary at the tip of the spray nozzle.

It is sectional drawing which shows the looper apparatus vicinity of the hot finishing rolling mill in embodiment of this invention. It is a side view of the looper apparatus of FIG. It is a top view of the looper apparatus of FIG. It is a front view of the looper apparatus of FIG. It is AA sectional drawing of FIG. It is a figure which shows the injection area of the cooling water injected from each spray nozzle of the looper apparatus in this embodiment, Comprising: (a) is a top view which shows the steel plate back surface in a looper standby position, (b) is a side surface of (a). FIG. It is a figure which shows the injection area of the cooling water injected from each spray nozzle of the looper apparatus in this embodiment, Comprising: (a) is a top view which shows the steel plate back surface in a looper control position, (b) is a side surface of (a). FIG. It is a figure which shows the injection area of the cooling water injected from each spray nozzle of the looper apparatus as a comparative example, Comprising: (a) is a top view which shows the steel plate back surface in a looper standby position, (b) is a side view of (a) FIG. It is a figure which shows the injection area of the cooling water injected from each spray nozzle of the looper apparatus as a comparative example, Comprising: (a) is a top view which shows the steel plate back surface in a looper control position, (b) is a side view of (a) FIG.

  FIG. 1 is a cross-sectional view showing the vicinity of a looper device of a hot finishing rolling mill according to an embodiment of the present invention. In FIG. 1, a looper device 1 according to an embodiment of the present invention is installed between rolling stands of a hot finishing rolling mill (between rolling stands F1 and F2 in the illustrated example). The looper device 1 is a device in which a looper roller 4 is rotatably supported on a frame 3 that rotates in the vertical direction about a rotating shaft 2, and the looper roller 4 is pressed against the steel sheet S between the rolling stands. The tension of the steel sheet S is adjusted.

  2 is a side view of the looper device of FIG. 1, FIG. 3 is a plan view, and FIG. 4 is a front view. The inside of the frame 3 of the looper device 1 in the present embodiment is configured as a water tank portion 5 that is filled with cooling water. The water tank unit 5 is provided with a plurality of spray nozzles 6 that inject the cooling water in the water tank unit 5 toward the upper side of the looper device 1. A plurality of skid rails 7 are juxtaposed on the upper surface of the frame 3 in the width direction of the steel sheet S (the left-right direction in FIG. 3), and the spray nozzle 6 is interposed between the plurality of skid rails 7. The steel plates S are arranged side by side in the traveling direction and the width direction so as not to protrude from the upper surface.

  5, the spray nozzle 6 is provided with an inclination of 0 to 20 ° from the vertical direction to the traveling direction of the steel sheet S when the upper surface of the frame 3 is in a horizontal state. ing. In the present embodiment, each spray nozzle 6 is set such that the inclination angle sequentially increases from 0 °, 10 °, 15 °, and 20 ° from the rear side in the traveling direction of the steel sheet S to the front side. Yes.

  The water tank 5 and the water supply pipe 10 for supplying cooling water to the water tank 5 are connected by a flexible hose 8. The water supply pipe 10 and the flexible hose 8 are connected by a swivel joint 9 having a rotation axis parallel to the rotation axis 2 of the looper device 1. Similarly, the water tank unit 5 and the flexible hose 8 are connected by a swivel joint 9 having a rotation axis parallel to the rotation axis 2 of the looper device 1.

  In the looper device 1 configured as described above, the frame 3 itself of the looper device 1 is used as a water tank portion 5 that functions as a cooling water header, and the cooling water in the water tank portion 5 is arranged side by side in the traveling direction and the width direction of the steel sheet S. By spraying from the plurality of spray nozzles 6 above the looper device 1, the back surface of the steel plate S can be uniformly cooled in a wide range, and thus the oxidation of the back surface of the steel plate S can be suppressed to obtain a high-quality product. Is possible.

  Since the spray nozzle 6 can spray uniformly over a wide range with a small amount of water, the amount of cooling water supplied to the water tank 5 may be small, and an increase in the weight of the looper device 1 can be prevented. Therefore, the looper device 1 does not affect the original operation of the looper device 1. In particular, in the looper device 1, the swivel joint 9 is rotated by a rotation axis parallel to the rotation axis 2 of the looper device 1 and the flexible hose 8 is bent during the rotation operation of the looper device 1. The load on the looper device 1 during the rotating operation is reduced.

  Next, in the looper device 1 according to the present embodiment, the point that the plurality of spray nozzles 6 are provided to be inclined by 0 to 20 ° in the traveling direction of the steel sheet S from the vertical direction will be described. FIG. 6 is a view showing the spraying area of the cooling water sprayed from each spray nozzle 6 of the looper device 1 in the present embodiment. FIG. 6A is a looper standby position (from the horizontal state of the upper surface of the frame 3 upward 4). ... Is a plan view showing the rear surface of the steel plate at a position inclined by 8 °, and (b) is a side view of (a). FIG. 7A is a plan view showing the rear surface of the steel plate at the looper control position (similarly tilted upward by 20 °), and FIG. 7B is a side view of FIG. 8 and 9 show a case in which the inclination angles of the spray nozzles 6 of the looper device 1 are all 0 ° as a comparative example corresponding to FIGS. 6 and 7.

  Comparing FIG. 6 (a) and FIG. 8 (a), the looper device 1 in the present embodiment is sprayed onto the back surface of the steel sheet S of the cooling water sprayed from each spray nozzle 6 at the looper standby position. Is getting wider. Moreover, even if FIG. 7 (a) is compared with FIG. 9 (a), the looper apparatus 1 in this embodiment is the back surface of the steel plate S of the cooling water sprayed from each spray nozzle 6 in a looper control position. The spray area is wide.

  Thus, in the looper apparatus 1 in this embodiment, the inclination angle of each spray nozzle 6 is changed in the range of 0 to 20 °, and the cooling water sprayed from the spray nozzle 6 at the standby position of the looper apparatus 1 is injected. By adjusting the area to be wide, it is possible to obtain a high-quality product even at the front end portion of the steel sheet where the occurrence of quality abnormality is remarkable. Here, the adjustment is made so that the spraying area at the standby position is wide. The looper device 1 is at the standby position until the steel plate tip passes between the rolling stands and engages with the next stand, and from there the steel plate tip This is for injecting cooling water into the part.

  In the looper device 1 in the present embodiment, a small amount of cooling water is continuously discharged from each spray nozzle 6 even when the steel sheet S is not flowing. Thereby, it can prevent that a foreign material penetrate | invades from the front-end | tip of each spray nozzle 6 in the state which the steel plate S is not flowing, and the opening-and-closing mechanism like the conventional swing plate is unnecessary at the front-end | tip of the spray nozzle 6. FIG.

  The looper apparatus of the present invention is useful as a looper apparatus installed between rolling stands of a hot finishing rolling mill composed of a plurality of rolling stands, and in particular, cooling of the back surface of a hot rolled steel sheet rolled by a hot finishing rolling mill. It is suitable as a looper device having a function.

S Steel plate F1, F2 Rolling stand 1 Looper device 2 Rotating shaft 3 Frame 4 Looper roller 5 Water tank 6 Spray nozzle 7 Skid rail 8 Flexible hose 9 Swivel joint 10 Water supply piping

Claims (3)

A looper device installed between rolling stands of a hot finishing rolling mill composed of a plurality of rolling stands,
A water tank formed on the frame of the looper device;
Wherein are arranged side by side on the upper surface of the frame to a steel sheet traveling direction and the steel plate width direction of the looper device, the cooling water is connected to each of the water tank unit have a plurality of spray nozzles for injecting upward of the looper device,
The inclination angle of the plurality of spray nozzles is 0 to 20 ° from the vertical direction to the steel plate traveling direction when the upper surface of the frame is in a horizontal state,
And the inclination angle of the spray nozzle arranged on the downstream side in the steel plate traveling direction becomes sequentially larger than the inclination angle of the spray nozzle arranged on the upstream side in the steel plate traveling direction.
A looper device characterized by that . A flexible hose is provided between a water supply pipe for supplying cooling water to the water tank part and the water tank part,
The looper device according to claim 1, wherein the water supply pipe, the water tank section, and the flexible hose are respectively connected by a swivel joint having a rotation axis parallel to the rotation axis of the looper device. The looper device according to claim 1 or 2 , wherein the plurality of spray nozzles continuously discharge a small amount of the cooling water even when the steel plate is not flowing.

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