JP2503430B2 - Steel plate cooling system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a steel plate cooling device used for cooling a red-hot steel plate rolled by hot rolling, for example.

[Prior Art] When manufacturing a steel sheet, a 1,200-1300 ° C red-hot slab is rolled to a thickness of about 10-100 mm with a rolling mill to form a steel sheet, and then this steel sheet still in a red-hot state is water-cooled. That is, there is a step of hardening and strengthening the steel sheet by quenching.

As a cooling device therefor, conventionally, a cooling device shown in FIGS.
The one shown in the figure is used.

In FIG. 7, reference numeral 1 is a gate-shaped frame fixed to a base 2, in which an upper roll table 3 and a lower roll table 4 are arranged.

These upper and lower roll tables 3 and 4 extend in the conveying direction of a steel plate sent from a rolling mill (not shown) and are arranged in two upper and lower stages so as to be parallel to each other. It is conveyed by being sandwiched between the roll tables 3 and 4. The upper and lower roll tables 3 and 4 have substantially the same structure.

That is, as shown in FIG. 8, the upper and lower roll tables 3 and 4 include a large number (eight in this case) of upper rolls (transport rolls) 5 ... and lower rolls (transport rolls) 6 ... Upper roll 5 ... and lower roll 6 ...
, And a spray nozzle 8 for ejecting cooling water.

The upper rolls 5 ... And the lower rolls 6 ... are arranged in the steel sheet conveying direction, and the roll shafts 5a.
It is supported by ..., 10 ... and the roll shafts 5b, 6b on the other end side.
Are attached to the drive mechanism 7.

The drive mechanism 7 includes a gear box 11 and a drive motor 12.

In the gear box 11, as shown in FIG. 8, by the rotation of one transmission shaft 11a, the upper roll 5 ... (Lower roll 6
...) rotates and a large number of gears that rotate the transmission shaft 11a are incorporated. Then, in the gear box 11, the roll shafts 5b ... (6b ...) of the upper roll 5 ... (lower roll 6 ...)
Is mounted, and the drive motor 12 connected to the outside of the gear box 11 is actuated to rotate the upper rolls 5 ... (Lower rolls 6) via the respective gears in the gear box 11. . That is, as shown in FIG. 9, one drive motor 12 drives the rotation of the entire upper rolls 5 ... And the entire lower rolls 6.

In this case, the lower rolls 6 are for transporting the steel plate, and the upper rolls 5 are mainly for pressing the steel plate from above, and the purpose for rotating the upper rolls 5 is to transport the steel plate. At the same time, it is supposed to prevent the steel plate from being scratched.

Further, the spray nozzles 8 are arranged between the upper rolls 5 and between the lower rolls 6 and are set so as to eject the cooling water toward the steel plate.

The upper and lower roll tables 3, 4 configured as described above
Among them, the lower roll table 4 is, as shown in FIG.
The bearing 10 and the gear box 11 are fixed to the base 1 by being attached thereto.

Further, one upper roll table 3 can be raised and lowered as shown in FIG. That is, the screw 13a of the lifting jack 13 which is operated by the motor is screwed into the portal frame 1, and the lower end of the screw 13a is extended between the bearing 9 on the upper roll 5 side and the gear box 11. It is connected to the lifting frame 14 that has been lifted. That is, the upper roll table 3 is in a state of being suspended from the portal frame 1 by the screw 13a of the lifting jack 13.

When the lifting jack 13 is operated, the upper roll table 3 moves up and down, whereby the distance between the upper and lower roll tables 3 and 4 can be adjusted according to the thickness of the steel plate.

The upper roll table 3 is mounted on the upper portion of the lifting frame 14 on the opposite side to which the gear box 11 is attached, that is, on the upper bearings 9 of the upper rolls 5.
The canter weight 15 is installed so that it does not lean toward the 11 side and the horizontal balance is maintained.

According to such a cooling device, the red hot steel plate sent from the rolling mill is sandwiched between the upper and lower roll tables 3 and 4, and the upper rolls 5 ... And the lower rolls 6 ... When the steel plate is continuously conveyed by rotating to, the cooling water is jetted toward the steel plate from the spray nozzles 8 arranged between the upper rolls 5 and the lower rolls 6 at this time. The steel plate is cooled.

[Problems to be Solved by the Invention] By the way, when cooling the steel sheet by the above apparatus,
As shown in the figure, when a steel plate (indicated by reference sign W) enters between the upper and lower roll tables 3 and 4, and its end is rapidly cooled by the cooling water ejected from the spray nozzles 8 ...
In some cases, the cooled portion may be distorted and slightly curved toward the upper roll table 3 side. In this case, the curved surface of the steel plate W comes into strong contact with the upper rolls 5 ...
As shown in Fig. 11, the entire upper roll table 3 is slightly lifted.

Then, a gap is created between the steel plate W and the upper and lower rolls 5 ..., 6 ..., As shown in FIG. 12, the steel plate W advances while lifting the upper rolls 5 ... In this case, the number of the upper rolls 5 ... Which the curved portion contacts is one or two.

By the way, since the drive motor 12 on the upper roll 5 side has a capacity for rotating the eight upper rolls 5 ... As described above, only one or two upper rolls 5 ...
, The force of the drive motor 12 for rotating the eight rolls is concentrated on the one or two upper rolls 5 ..., and the upper rolls 5 ... Try to.

However, since the upper rolls 5 are strongly pressed by the steel plate W, they are slower than the rotation of the lower rolls 6 and the braking action acts on the steel plate W.

For this reason, a large load is applied to the roll shaft 5b and the transmission shaft 11a, so that the roll shaft 5b and the transmission shaft 11a of the upper rolls 5 must be made rigid so as to withstand this. . That is, it was an excessive facility in preparation for the steel sheet W to be curved.

[Means for Solving Problems] The present invention has been made to solve the above problems, in which a large number of transport rolls are arranged in two upper and lower stages, and between the upper and lower transport rolls. The steel plates are continuously conveyed by rotating the rolls sandwiching the steel plates, and at this time, the steel plates are cooled by a fountain discharged from spray nozzles arranged between the upper rolls and between the lower rolls. In the cooling device, a drive motor for rotating the rolls,
Each upper roll or two adjacent upper rolls as one set is provided for each set and connected to one end side of the upper roll, and each upper roll is independently or two by the drive motor. The feature is that one set of upper rolls is driven independently of the other set of upper rolls.

[Operation] Since the drive motor only needs to rotate one or two upper rolls, the capacity of these drive motors may be extremely small.

According to this, a small drive motor with a small capacity,
If you deploy the upper roll for every one or two,
For example, when the steel plate enters between the upper and lower roll tables and is cooled, the steel plate slightly bends, and even if this curved portion makes strong contact with the upper roll, the drive motor will not be able to resist the steel plate. Almost no force to convey is generated, and the upper roll simply rotates following the conveyed steel plate.

Therefore, since the load from the drive motor is hardly applied to the roll shaft of the upper roll, the strength of the roll shaft can be reduced.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In this embodiment, the drive mechanism for rotating the upper rolls 5 is changed in the prior art cooling device shown in FIGS. 7 to 9, and the drive mechanism will be described below. . The same components as those in the conventional example are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, as shown in FIGS. 2 and 3, every two upper rolls 5 ... Which are adjacent to each other, that is, every other one, every other roll shaft 5b. 21 is connected. Further, a gear box 22 is connected to the roll shafts 5b of the upper roll 5 on the side not connected to the drive motor 21. The gear box 22 and a gear incorporated in the speed reducer 20 are transmitted to the gear box 22. Belt 23 is stretched over.

As a result, as shown in FIG. 3, the two upper rolls 5
Are set as one set, and when each drive motor 21 is operated, the upper rolls 5 are independently rotated for each set.

According to the steel plate cooling apparatus of the present embodiment configured as described above, since the drive motor 21 only needs to rotate the two upper rolls 5 ..., the capacity of these drive motors 21 is the same as that of the conventional drive motors. It can be smaller than

Therefore, for example, if the steel plate enters between the upper and lower roll tables 3 and 4 and is cooled, and the steel plate slightly bends, even if the upper rolls 5 make strong contact, the steel plate will be conveyed against this. Almost no force is generated, and the steel plate simply rotates following the conveyed steel plate.

Therefore, since the load from the drive motor 21 is hardly applied to the roll shaft 5b on the upper roll 5 side, the strength of the roll shaft 5b can be reduced.

Further, the drive motor 21 can be downsized due to the decrease in capacity, and since it is only necessary to deploy this small drive motor 21 via the speed reducer 20, the device itself can be made compact, and therefore the equipment can be made compact. The weight can be reduced.

4 and 5 show another embodiment of the present invention.

In this embodiment, one reducer 30 is provided for each of the upper rolls 5 ...
The drive motor 31 is attached via the above so that the upper rolls 5 ... Can be independently rotated.

According to the present embodiment, the drive motor 31 need only rotate one upper roll 5, so that its capacity may be half that of the drive motor 21 of the above embodiment. For this reason, the roll axis
The strength of 5b can be further reduced, and the equipment can be made smaller and lighter.

FIG. 6 is a diagram showing still another embodiment of the present invention.

In this embodiment, the universal joint 40 penetrating to the outside of the portal frame 1 is attached to the roll shaft 5b of the upper roll 5 ...
And a drive motor 42 is connected to the protruding end of the universal joint 40 via a speed reducer 41 fixed to the gate-shaped frame 1.

In this case, make two sets of upper rolls 5 ... One set, one set for each set, and use the universal joint 4 as shown above.
0, a speed reducer 41 and a drive motor 42 are provided, and a transmission belt (not shown) is passed between the speed reducer 41 and the roll shaft 5b so that one drive motor 42 rotates two upper rolls 5 ... Alternatively, the universal joint 40, the speed reducer 41 and the drive motor 42 are provided for each of the upper rolls 5 so that one drive motor 42 rotates one upper roll 5.

According to such a device, the speed reducer 41 and the drive motor
Since 42 is fixed to the portal frame 1, the weight of the upper roll table 3 is greatly reduced. Therefore, a lifting jack for lifting the upper roll table 3
The power consumption of 13 can be reduced and the lifting frame
It has the advantage that it is not necessary to install the counterweight 15 on the 14. Further, it goes without saying that the same effects as those of the two embodiments described above are provided.

It should be noted that, for example, a structure in which a motor is incorporated in a hollow roll has been put into practical use as a driving roller in a roll conveyor, and such a motor-incorporated roller is used as an upper roll in a steel plate cooling device according to the present invention. It may be considered to use it as a lower roll or a lower roll, but applying such a motor-incorporated roller to a steel plate cooling device according to the present invention makes it possible to obtain strength and rigidity of the roll, heat resistance and water resistance of the built-in motor, and maintenance. There is a problem in terms of sex. That is, such a roller with a built-in motor would be suitable when it is applied to a roller conveyor or the like that does not receive a significant load, but by sandwiching a steel plate, a large load is applied, and the roller is exposed to high temperatures and cooled. The water is sprinkled,
It cannot be applied as a steel plate conveying roll in a steel plate cooling device used under severe conditions.

Also, it may be possible to deploy the drive motor between the rolls instead of deploying it laterally, in which case the drive motor is directly exposed to the radiant heat of the steel sheet,
This is also not preferable because the cooling water is directly sprinkled on the drive motor.

From these points, in the present invention, the drive motor is connected to one end side of the upper roll, and therefore the drive motor is naturally arranged on the side of the upper roll, so that the upper roll itself should have great strength and rigidity. In addition to being able to do so, it is also advantageous in securing heat resistance, water resistance, and maintainability of the drive motor.

[Effects of the Invention] As described above, according to the steel plate cooling apparatus of the present invention, the drive motor for rotating the upper roll is provided with the upper roll 1
Each upper roll or two adjacent upper rolls as one set is provided for each set and connected to one end side of the upper roll, and each upper roll is independently driven by the drive motor, or two
Since the upper rolls of one set are driven independently of the upper rolls of the other set, the following effects can be obtained.

Since the drive motor only needs to rotate one or two upper rolls, these drive motors may have a very small capacity as compared with conventional drive motors, and can be miniaturized.

According to this, if a small drive motor is provided for every one or two rolls on the upper roll, when the steel plate enters between the upper and lower roll tables and is cooled, the steel plate slightly bends. Even if the curved part makes strong contact with the upper roll, the drive motor hardly generates a force to convey the steel plate against this, and the upper roll simply follows the conveyed steel plate and simply rotates. .

Therefore, since the load from the drive motor is hardly applied to the roll shaft of the upper roll, the strength of the roll shaft can be reduced.

As described above, the size and weight of the equipment can be reduced.

By arranging the drive motor on the side of the upper roll and connecting it to one end side, it is possible to give the upper roll sufficient strength and rigidity, as well as the heat resistance, water resistance, and maintainability of the drive motor. But it is advantageous.

[Brief description of drawings]

1 to 3 are views showing an embodiment of the present invention, in which FIG. 1 is a sectional arrow view thereof, FIG. 2 is a plan view of an upper roll table in FIG. 1, and FIG. FIG. 1 is a drive system diagram of the upper and lower roll tables, FIGS. 4 and 5 are views showing another embodiment of the present invention, and FIG. 4 is a plan view of the upper roll table, and FIG. Is a drive system diagram of the upper and lower roll tables, and FIG. 6 is a sectional arrow view showing another embodiment of the present invention. 7 to 9 are views showing a conventional technique, FIG. 7 is a sectional view thereof, FIG. 8 is a plan view of the roll table, and FIG. 9 is a view of upper and lower roll tables. A drive system diagram, and FIGS. 10 to 12 are diagrams for explaining the problems of the conventional technique. 5 ... Top roll, 6 ... Bottom roll, 8 ... Spray nozzle, 21, 31, 42 ... Drive motor.

Claims (1)

(57) [Claims] 1. A large number of transport rolls are arranged in two upper and lower stages,
By sandwiching the steel plate between these upper and lower transport rolls and rotating each roll, the steel strip is continuously transported,
At this time, in a steel plate cooling device that cools a steel plate with a fountain ejected from a spray nozzle arranged between each upper roll and between each lower roll, a drive motor for rotating each upper roll is provided with one upper roll. Each pair or two adjacent upper rolls are set as one set and are connected to one end side of the upper rolls, and each upper roll is individually or individually set by the drive motor. A cooling device for a steel sheet, characterized in that the roll is driven independently of the upper roll of the other set.