JPS5916618A - Cooling device of thick steel plate - Google Patents

Abstract

PURPOSE:To cool uniformly a thick steel plate throughout the whole surface, by arranging, in the conveying direction, plural cooling units constituted of cooling headers which have plural pairs of upper and lower rolls and many nozzles and are arranged at the upper and lower parts of the steel plate, and making a group of the upper rolls of each cooling unit independently movable in the vertical direction. CONSTITUTION:Cooling units 1-3, each of which is constituted of plural pairs of rolls 6, 7 pressing a thick steel plate M from its upper and lower sides and arranged along the conveying direction of the plate M, cooling headers 30 arranged at the upper and lower parts of the plate M and extended to the plate- width direction, and many nozzles 42 facing to the surfaces of plates provided along the front side direction of the headers 30. The units 1-3 are arranged along the conveying direction, and a group 9 of the upper rolls of each cooling unit is made vertically movable. Then the operation is performed by selecting proper cooling units to form a prescribed cooling pattern, and the cooling units being stayed in suspension are retreated by the group 9 of upper rolls.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device used for online cooling of high-temperature metal materials, particularly hot-rolled thick steel plates.

In recent plate manufacturing processes, reduction of alloying elements,
For the purpose of heat-saving treatment, development of new steel types, etc., research into the so-called temper cooling process, which combines condrol rolling with forced cooling immediately after rolling, has been active, and is already being put into practical use.

The cooling equipment applied to this process has characteristics that are compatible with the multi-product manufacturing that is a feature of the thick plate manufacturing process, and at the same time has the characteristics of online cooling equipment that is installed immediately after the rolling mill or immediately after the hot straightening machine. It has to be something. Therefore, the cooling equipment must meet the following conditions: 1. It must have cooling performance and controllability suitable for the applied process. 2. It must have excellent uniformity in cooling the material to be cooled vertically and in the direction of the plate.
Variations in material quality between plates and deterioration of steel plate shape due to cooling are kept to a minimum. 3. Hot steel plates are frequently passed through the line without cooling, so in that case, evacuation, bypass or other methods should be used. The cooling system can be protected. 4. It is installed in the most important line of the factory, so there are few failures, and it is a compact facility with excellent maintainability. 2. As equipment for cooling hot thick steel plates, for example, 4
No. 7-46641 is known.

The technology disclosed herein relates to a roller pressure quench system, in which a hot thick steel plate is conveyed while being restrained between upper and lower rollers, and a liquid refrigerant is supplied to both the upper and lower surfaces of the thick steel plate. It is hardened. However, this equipment is related to the above-mentioned fine-temperature cooling process, and if this equipment is applied to the above-mentioned online cooling equipment, it is necessary to improve the equipment that adjusts the cooling conditions, and the above-mentioned Conditions 3 and 4 have drawbacks, and improving them will require a moderate increase in investment costs.

This invention was made to solve the above-mentioned problems in cooling thick steel plates, and aims to protect the main parts of the cooling device and provide a cooling device for thick steel plates that is easy to maintain. .

The cooling device of the present invention has a plurality of upper and lower roll pairs and a large number of nozzles, and a cooling unit is constituted by cooling water lugs arranged above and below a thick steel plate. A plurality of cooling units are arranged along the conveying direction, and the upper roll set of each cooling unit can be moved up and down independently.

In the apparatus configured as described above, a required cooling unit is selected and operated according to the cooling pattern. The pair of rolls are driven to rotate and clamp the thick steel plate from above and below. Therefore, the upper and lower roll pairs function to partition the cooling line along the conveyance direction, restrain the thick steel plate, and advance the thick steel plate.

Cooling water is injected from the nozzle of the cooling header to cool the thick steel plate. At this time, since the cooling line is partitioned into pairs of rolls as described above, the thick steel plate is cooled within each partition. Also, in this invention, a plurality of cooling units are arranged as described above. By doing so, the cooling line is divided into multiple cooling zones. Therefore, by selecting and operating an appropriate cooling unit and stopping all three other cooling units, a desired cooling pattern can be obtained. At this time, the upper roll set of the cooling unit that is inactive is retracted upwardly, independently of those of the other cooling units. The lower roll set remains in the unrolling position and acts as a transport roll.

When a thick steel plate passes through a cooling unit that is inactive, if the rolls are not retracted, the rolls will squeeze the hot thick steel plate, and the rolls are likely to be damaged. If a warped steel plate enters a cooling unit that is not in use, it may hit the first roll and damage the roll. However, by retracting the upper roll set to one side as in the present invention, damage to the rolls can be prevented. Although the nozzle is slightly away from the thick steel plate, it is desirable that the nozzle on the "-" side be retracted upward together with the two-roll set.

Furthermore, in a cooling device for thick steel plates, many pairs of rolls, nozzles, etc. are arranged adjacent to each other, making it difficult to maintain and inspect the device. However, by retracting the upper roll set upward, maintenance and inspection of the rolls, nozzles, and other attached devices becomes significantly easier.

Examples of the present invention will be described below.

FIG. 1 and FIG. 2 show an example of the cooling device of the present invention, and are a side view and a front view of the device, respectively.

As shown in the drawing, the cooling device consists of three cooling units 1°2.3 arranged along the cooling line.

Each of the cooling units )], 2, 3 is equipped with seven roll pairs 5, and the roll pairs 5 consist of an upper roll 6 and a lower roll 7.

The upper rolls 6 are arranged in sets for each cooling unit (1, 2, 3), and are attached to a gate-shaped frame 9 provided so as to straddle the cooling unit so as to be movable up and down. That is, each cooling unit) 1. , 2.

3 is provided with an elevating frame 11 consisting of a vertical beam 12 extending in the conveyance direction and a horizontal beam 13 perpendicular to the beam.

A threaded rod 16 is connected to the vertical beam 12 via a joint 15. On the other hand, a screw mechanism 18 including a worm gear, a screw sleeve, etc. (not shown) driven by a motor 17 is provided at the top of the portal frame 9, and a screw rod 16 is fitted into this screw mechanism 18. Therefore, by driving the motor 17, the elevating frame 11 moves up and down using the guides 19 provided on the posts 10 of the portal frame 9 as a guide. The upper roll 6 is attached to the cross beam 13 via a bearing stand 21, and is rotationally driven by a motor 22 with a reduction gear.

The lower roll 7 is supported by a stand 25 extending in the conveying direction, and is rotationally driven by a motor 26 with a speed reducer.

Cooling water headers 29 and 30 are arranged on one side and below each roll pair 5, respectively. Both ends of the upper cooling water header 29 are connected to cooling water supply pipes 32, respectively. The cooling water supply pipe 32 is a flexible pipe 3 as shown in FIG.
3 and a slip type fitting 34. Flexible tube 3
3 is -F, which absorbs the eccentricity of the lower tube.

The slide type pipe joint 34 has a double pipe structure consisting of an inner pipe 35 and an outer pipe 36, and a packing 37 and an O-ring 38 are inserted between the two pipes 35 and 36. When the elevating frame 11 moves up and down, the inner tube 35 moves up and down while keeping watertight with respect to the outer tube 36. Lower cooling water header 3
Both ends of the cooling water headers 29 and 30 are connected to fixed cooling water supply pipes (not shown) that do not include flexible pipes, etc. A large number of nozzles 41 are installed along the longitudinal direction of the cooling water headers 29 and 30, that is, the width direction of the plate. , 42 are provided. The nozzle 41 faces the upper surface of the plate, and the nozzle 42 faces the lower surface of the plate.

The cooling device configured as described above is connected immediately after the rolling mill or hot straightening machine.

Next, a method of cooling a thick steel plate using the above cooling device will be explained.

First, select the cooling unit (1.2.3) to be operated. Which cooling unit to operate depends on the temperature 9 dimensions of the thick steel plate M,
Determined by cooling rate, rolling speed, etc. In this embodiment, first and second cooling units 1 and 2 are operated. The roll gap of the operating cooling unit 1.degree. 2 is set according to the thickness of the thick steel plate M. The cooling unit 3 that is inactive is retracted sufficiently upward so that the upper roll 6 and nozzle 41 are not affected by heat from the thick steel plate M. That is, when the lifting frame 11 is raised by driving the motor 17, the upper roll 6, the cooling water header 29. The set of nozzles 41 moves up as one and is withdrawn from the cooling line.

In the above state, the thick steel plate M is passed through the cooling device and cooled while being conveyed. Cooling water is separated (roll vs. 5)
0 interval) toward the thick steel plate M in a turbulent state.
, 42. The cooling water is injected to such an extent that it flows sufficiently to cover the upper and lower surfaces of the thick steel plate M.

This invention is not limited to the above embodiments.

For example, the number of roll pairs per cooling unit or the number of cooling units may be greater or less than that of the embodiment. Further, the upper roll may not be entirely driven to rotate, but may be partially driven. Furthermore, the lifting device may use a pneumatic or hydraulic cylinder instead of an electric motor.

[Brief explanation of drawings]

FIG. 1 is a side view showing an example of the cooling device of the present invention, and FIG.
1 is a front view of the apparatus shown in FIG. 1, and FIG. 3 is an enlarged vertical sectional view of a cooling water supply pipe of the apparatus shown in FIG. 1. 1.2.3... Cooling unit, 5... Roll pair, 6
゜7...roll, 9...gate frame, 11...
Lifting frame, 17, 22. 26... Motor, 29
, 30... Ladder to cooling, 32... Cooling water supply pipe, 41, 42... Nozzle, M... Thick steel plate. Patent applicant representative patent attorney Tomoyuki Yabuki (and 1 other person)

Claims (1)

[Claims] A plurality of rotatably driven roll pairs arranged along the transport direction of the thick steel plate, which clamp and press the thick steel plate from above and below, and a ladder arranged above and below the thick steel plate and extending to the cooling water extending in the width direction of the plate; A plurality of cooling units, which are provided along the longitudinal direction of the cooling water header and include a large number of nozzles facing the plate surface, are arranged along the conveying direction, and independently control the upper roll set in each cooling unit. A thick steel plate cooling device that can be moved up and down.