JPH0537955U - Air cooling device - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a gas jet cooling device applied to the strip cooling zone of an ironmaking process line, which prevents damage to the product caused by strip flutter due to gas wiping in the cooling zone, It is intended to improve productivity as well as to improve productivity because it is not necessary to limit the transport speed. [Structure] The strip 1 is attached to a strip 1 transport line.
A plurality of cooling gas jet nozzles 7 are arranged on the front surfaces of the plenum 6 facing each other with the plenum 6 interposed therebetween to form an air cooling device. Several sets of non-contact displacement sensors 2 and electromagnets 3 are arranged in the strip width direction at the center of the air-cooling device in the line direction. The sensor 2 and the electromagnet 3 are connected by a control circuit, the position due to the flutter of the strip is detected by the sensor 2, and the signal is fed back to the current of the electromagnet 3 via the control circuit, and the attraction force of the electromagnet 2 is used. , The strip is moved to the target position in the central part of the air-cooling device with the largest runout, and vibration of the strip due to flutter is reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air cooling device applied to a strip cooling zone of a steelmaking process line.

[0002]

[Prior Art]

 In the steel-making process line, it is usual to convey the heated strip of steel sheet and cool it. An air cooling device cools the air.

FIG. 3 shows an example of a conventional air cooling device. 3 (a) is a side view and FIG. 3 (b) is a plan view. In these figures, the heated strip 1 is provided with a cooling gas introduced into a cooling zone (plenum) 6 arranged opposite to each other. It is cooled by injecting from.

At this time, the gas ejected from the nozzle 7 excites the strip 1 as shown in FIG. 3 (a), causing flapping (flutter), and the strip comes into contact with the transport passage to damage the product and Was causing a decline.

In addition, in order to increase the transport speed of the strip, it is necessary to increase the gas ejection amount in the cooling zone and increase the cooling speed. This increases flapping of the strip and limits the transport speed because the strip comes into contact with the transport passage.

[0006]

[Problems to be solved by the device]

 As described above, in the conventional air-cooling device, the flutter of the strip by the air-cooling device has a drawback that the product is damaged, the quality is deteriorated, and the transportation speed is limited.

An object of the present invention is to provide a new air cooling device that solves the above-mentioned problems.

[0008]

[Means for Solving the Problems]

 As an arrangement for achieving the above object, the air cooling device of the present invention is a gas jet type air cooling device comprising a plenum and a nozzle, and a plurality of strips are provided in the strip width direction at the center of the air cooling device in the line direction. A non-contact displacement sensor and an electromagnet are juxtaposed, the sensor, a control circuit for inputting the position signal of the strip detected by the sensor after subtracting it from a target value, and a signal from the control circuit is input to excite the electromagnet. It is characterized in that a drive circuit for outputting a signal and the electromagnet are connected.

[0009]

[Action]

 The air-cooling device of the present invention detects the position of the strip by the non-contact displacement sensor provided at the central position in the direction of the air-cooling equipment line, which is the most liable to be swung by the jet of the cooling gas. Subtract and output a signal to the control circuit.

Then, the control circuit outputs a signal to a drive circuit connected to the control circuit.

The drive circuit outputs an exciting current to an electromagnet connected to the exciting current.

As a result, the electromagnet generates an attractive force to move the strip to a target position, which reduces flutter on the strip due to jetting of the cooling fluid.

By the above-mentioned action, the product is not damaged and the transportation speed is not limited due to the flutter of the strip in the cooling zone, the quality of the product is improved, and the transportation speed can be increased.

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 (a) and 1 (b) show a side view and a plane of the air cooling device of the present invention, and FIG. 2 is a schematic explanatory view of a control circuit in the device of the present invention. is there.

In these figures, a plenum (cooling zone) 6 is arranged opposite to each other with the strip 1 sandwiched in the carrier line of the strip 1 in the iron-making process line, and a cooling gas jet is formed on the front surface of the plenum 6 facing each other. A large number of nozzles 7 are arranged to configure an air cooling device.

Several sets of non-contact displacement sensors 2 and electromagnets 3 are arranged in parallel near the central portion in the line direction of the nozzle group in the air cooling device, and the sensors 2 and electromagnets 3 are installed in the strip width direction of the strip 1. Has been done. The present embodiment shows an example in which five sets of sensors and electromagnets are arranged in the width direction.

The center of the air-cooling device in the line direction is the position where the strip 1 is most likely to vibrate due to the cooling gas sprayed from each nozzle 7 toward the strip 1, and the sensor and electromagnet are placed at that position. Is most preferred.

The sensor 2 and the electromagnet 3 detect the position of the strip 1 which causes vibration due to flutter, and the signal is fed back to the current of the electromagnet 3 to reduce the flutter of the strip 1 by the attractive force of the electromagnet. Therefore, as shown in FIG. 2, the control circuit 4 for inputting the signal from the sensor 2 is connected to the sensor 2, the signal from the circuit 4 is input to the control circuit 4, and the exciting current is output to the electromagnet 3. The drive circuit 5 is in contact.

The drive circuit 5 is connected to the electromagnet 3. Each of these circuits does not have to be directly connected to the main body of the air cooling device.

Next, the operation of the device of the present invention will be explained. The non-contact displacement sensor 2 detects the position of the strip 1 and outputs a signal subtracted from the target position value of the strip to the control circuit 4.

Next, the signal from the control circuit 4 is output to the drive circuit 5, the excitation current is output from the drive circuit 5 as an electromagnet, and the strip is moved to the target position by the attraction force of the electromagnet 3 and vibrated by flutter. Is reduced.

Further, since such a structure has an effect of reducing the flutter of the strip, it is possible to increase the injection amount of the cooling gas, increase the cooling speed, and increase the transport speed.

From the above, the flutter of the strip due to the cooling fluid was reduced, the product was not damaged and the transport speed was not limited, the quality of the product was improved, and the transport speed could be increased.

[0024]

[Effect of the device]

 As described above, according to the air cooling device of the present invention, a plurality of sensors and electromagnets are arranged in the plate width direction at the central position in the line direction of the air cooling device where the jet of cooling gas is most easily blown. With the installation, the sensor detects the position of the strip, outputs the signal subtracted from the strip position target value to the control circuit, outputs the signal to the drive circuit, and then outputs the signal from the drive circuit. The magnetizing current is output to the electromagnet, which generates an attractive force that reduces the flutter of the strip. As a result, the flutter of the strip in the cooling zone due to the cooling fluid is reduced, the strip does not come into contact with the transport passage and the product is not damaged, and the transport speed can be increased.

[Brief description of drawings]

FIG. 1 is an air cooling device according to an embodiment of the present invention, in which (a) is a side view and (b) is a plan view.

FIG. 2 is a block diagram of a control circuit in the device of the present invention.

3A is a side view and FIG. 3B is a plan view showing a conventional device.

[Explanation of symbols]

 1 Strip 2 Non-contact Displacement Sensor 3 Electromagnet 4 Control Circuit 5 Drive Circuit 6 Cooling Zone (Plenum) 7 Nozzle

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Koichi Tokiyasu 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City Mitsubishi Heavy Industries, Ltd. Hiroshima Research Institute (72) Kazumasa Mihara 4-6 Kannon Shinmachi, Nishi-ku, Hiroshima No.22 Mitsubishi Heavy Industries Ltd. Hiroshima Works

Claims (1)

[Scope of utility model registration request] 1. A gas jet type air cooling device comprising a plenum and a nozzle in an iron-making process line for transporting strips, wherein a plurality of non-contact displacement sensors are arranged in the strip width direction at the center of the air cooling device in the line direction. Electromagnets are arranged in parallel, the sensor, a control circuit for subtracting the position signal of the strip detected by the sensor from a target value and inputting the signal, and a signal from the control circuit is input to apply an excitation signal to the electromagnet. An air cooling device comprising a drive circuit for outputting and the electromagnet connected to each other.