KR100939250B1 - Method to measure the on-line roll surface temperature and thereof apparatus - Google Patents

Abstract

The present invention relates to a method and apparatus for measuring the temperature of a rolling roll in operation.

The present invention is a thermocouple +,-wire is a wear insulation material core wire processing; A body in which the wear insulating material is inserted into the spring so as to be always protruded; The body is rotated to the work roll side to include a rotating cylinder connected to the work roll surface and the wear insulation and the core and the thermocouples +,-wires connected to the work roll at the same time at the same time, the surface of the rolling roll rolling the thermocouple In this case, a metal plate having excellent thermal conductivity and elastic modulus and thermocouples attached to both ends is bent in a semicircular shape so that only this metal plate is placed in direct contact with the rolling roll surface to measure the temperature change of the rolling roll surface.

According to the present invention, a more accurate temperature measurement is possible by directly measuring the measurement sensor on the surface of the rolling roll.

Description

METHOD TO MEASURE THE ON-LINE ROLL SURFACE TEMPERATURE AND THEREOF APPARATUS

1 is a schematic view showing a general rolling process,

Figure 2 is a graph showing the temperature change for each part of a typical rolling roll,

3 is an exemplary view of an indirect roll temperature measuring apparatus using an ultrasonic sensor according to the prior art,

4 is an exemplary view showing an embodiment of the present invention device,

5 is an illustrative view showing another possible example of the device of the present invention;

Figure 6 is a reference picture of the device according to an embodiment of the present invention,

Figure 7 is a reference picture of the device according to another embodiment of the present invention,

8 is a graph of a measurement result according to an embodiment of the present invention;

9 is a graph of a measurement result according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1 .... work roll 2 .... material

3 .... nozzle 4 .... wiper

5 .... sensors 10a, b ... thermocouples +,-wire

12 .... wear insulation 14.Spring                 

16..body 18..rotating cylinder

20..Secondary roll

The present invention relates to a method and apparatus for measuring, during operation, the temperature of a cylindrical roll used for transferring or rolling a hot product in a steelmaking process, and more particularly, to a roll due to heat transferred to the roll during a high temperature material transfer process. The present invention relates to a method and apparatus for measuring the temperature of a rolling roll in operation to accurately measure the surface temperature of the roll by using a contact thermal conductivity sensor in close contact with the surface of the roll so as to understand the degree of thermal expansion.

Typically, since the rolling rolls are thermally expanded by contact with the material 2 as shown in FIG. 1, a plurality of the rolling rolls are arranged in the width direction of the work roll 1 in which the nozzles 3 are the rolling rolls for cooling thereof. After spraying the cooling water by the spray method, the injected cooling water is discharged by the wiper (4).

That is, the work roll 1 is a hot rolling process as shown in FIG. 2, the material 2 is rolled at a high temperature of 900 ° C or more and the processing energy, friction energy, etc. are generated in the process of rolling the material 2 is instantaneous The surface temperature of the roll rises above several hundred degrees Celsius, and is cooled again by a large amount of cooling water, and the temperature falls gradually within 100 degrees Celsius.                         

As a result, the thermal expansion degree of the roll changes from time to time, which causes considerable difficulty in securing the shape of the desired product. Also, the thermal expansion of the roll deteriorates the flow rate, resulting in poor production speed. Accelerating wear caused by the degradation caused a shortened roll life.

Therefore, collecting information on the thermal change of the roll is a very important issue directly related to the life of the roll as well as the product quality. Conventionally, such information collection is predicted through a numerical model or as shown in FIG. The ultrasonic sensor (5) was installed outside (1) and the displacement was measured in a non-contact manner.

However, the prediction method based on the mathematical model is capable of qualitative prediction, but it is difficult to provide actual quantitative information because it is difficult to clearly know the cooling capacity for cooling the rotating roll by spraying a lot of coolant at high pressure. In the method using (5), pure water is used as the measurement water to measure the relative distance change to the roll in the measurement water with ultrasonic waves to obtain the desired information. Due to the thermal deformation of the beam supporting the sensor 5, the relative distance is changed or the vibration of the steel sheet during the rolling process makes it difficult to measure the sensor 5, and the degree is severely affected by the quality of the cooling water. There was a problem.

The present invention has been made in view of the above-described problems of the prior art, and has been created to solve the problem. Instead of indirect methods such as a non-contact type, the measurement sensor is directly contacted with the surface of the rotating work roll to measure the temperature more accurately. It is an object of the present invention to provide a method and apparatus for measuring the temperature of a rolling roll that is being made.

The above object of the present invention, in the method for measuring the surface temperature of the rolling roll during the material rolling, wrapped the thermocouples of the insulation and exposed forms of each other in the temperature measurement, and then rolling them by the force of the elastic body during the temperature measurement The surface of the rolling roll and the wear insulation material and the thermocouple wired at the same time are always in direct contact with each other, or the metal plate with excellent thermal conductivity and elastic modulus and the thermocouple attached at both ends is bent in a semicircular shape so that only this metal plate is in direct contact with the surface of the rolling roll. It is achieved by providing a method for measuring the temperature of a rolling roll in operation, which is arranged to measure the change in temperature of the surface of the rolling roll.

In addition, the above object of the present invention, in the apparatus for measuring the surface temperature of the rolling roll during the material rolling, the thermocouple +,-wire which is a sensor, the wear insulation material core wire processing; A body in which the wear insulating material is inserted into the spring so as to be always protruded; It is achieved by providing a temperature measuring device of the working roll roll, characterized in that the body is rotated to the work roll side and comprises a rotating cylinder connected to the work roll surface and the thermocouple +, wire is always in contact with the work roll. .

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

The present invention is configured to be able to measure the temperature change of the roll surface in direct contact with the surface while being driven with the work roll to verify the accuracy of the temperature measurement of the work roll.

 According to the present invention, when the coolant is not sprayed on the work roll, the measured temperature is attached to the surface of the work roll and appears to be about 5 ° C. higher than the temperature of the rotating work roll. In consideration of the fact that it can be measured accurately, the length of the measuring sensor to be in constant contact with the work roll to ensure that the constant contact with the work roll during the measurement to ensure that even long-term use even if worn.

In addition, the outside (end) of the sensor is wrapped in the same material as bakelite to further increase the accuracy of the measurement, by adding an elastic means on the end side of the sensor to facilitate the absorption of some vibration.

In the configuration of the apparatus, as shown in Fig. 4, a heat insulating material 12 for wear is provided in which the thermocouples + and-wires 10a and b, which are sensors, are core wired; The wear insulating material 12 is inserted into the body 16 so as to be always protruded by the spring 14; The body 16 is connected to the rotary cylinder 18 to be rotated to the work roll (1) side is installed so that the surface of the work roll (1) and the thermocouples +,-element wires (10a, b) are always in contact.

That is, according to the exemplary embodiment of the present invention, the thermocouples + and-wires 10a and b, which are planted in the wear insulator 12, are in contact with the work roll 1 at the same time as the heat insulator 12, It is configured to perform a temperature measuring operation by directly contacting the work roll 1 while being worn together by rotation.

Thus, when the work roll 1 is driven, the body 16 is rotated at an angle by the operation of the rotation cylinder 18 so that the thermocouples + and-wires 10a, which are the ends of the surface of the work roll 1 and the wear insulator 12, are worn. When the cooling water is sprayed through the nozzle 3 in contact with b, the temperature change of the surface of the work roll 1 can be accurately measured.

Figure 5 shows another possible example according to the present invention, by varying the shape of the body (16 ') to have a wide trapezoidal cross-sectional shape of the end thereof, and to form a recess groove in the center of the semi-circular wear insulation ( 12 '), the front end surface of the wear insulation material 12', that is, the thermal conductivity and elastic modulus is excellent, and the both sides of the metal plate on which the thermocouples +,-wires (10a, b) are arranged in a semi-circular shape, the workpiece Arranged in contact with the roll (1), a pair of rotatable auxiliary rolls (20) next to them to enable a smooth measurement by the rolling contact with the work roll (1), the measurement process of Figure 4 Same as the example.

Here, in another possible example of the present invention, the wear insulating material 12 ′ is a metal plate in which thermocouples + and-wires 10a and b are wired without directly contacting the work roll 1 and the work roll 1. It is configured to be installed in contact.

For reference, FIGS. 6 and 8 are photographs showing an example of a measuring device having the structure as shown in FIG. 4 and waveform diagrams showing the measuring process and the measurement result thereof; 7 and 9 are photographs showing an example of a measuring apparatus having the structure shown in FIG. 5 and waveform diagrams showing the measuring process and the measurement result thereof.

As described in detail above, according to the present invention, more accurate temperature measurement is possible by directly measuring the measurement sensor on the surface of the rolling roll.

Claims (5)

delete delete In the device for measuring the surface temperature of the rolling roll during material rolling, A metal plate having excellent thermal conductivity and elastic modulus; A body 16 for fixing the metal plate; And a rotation cylinder 18 which rotationally drives the body 16 to the work roll 1 side such that the metal plate is in contact with the surface of the work roll 1. The metal plate is provided with thermocouples + and-wires 10a and b, which are sensors, are wired on both sides and bent in a semicircular shape, and the thermocouples + and-wires 10a and b are not in contact with the work roll 1 and the metal plate. Temperature measuring device of the working roll, characterized in that only the direct contact with the work roll (1). delete The method of claim 3, On both sides of the metal plate a pair of auxiliary rolls (20) in rolling contact with the work roll (1) is installed, the temperature measuring device of the working rolling roll.

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