KR20170009607A - Hearth roll for heat treating furnace - Google Patents

Abstract

The present invention relates to an apparatus and a method of detecting a defect in a hearth roll of a heat treating furnace capable of detecting a defect of the hearth roll in a first stage. The hearth roll is separately disposed in a heat treating furnace to support the strip, and is rotated by a driving motor connected with one side of the apparatus to detect the defect in the hearth roll of the heat treating furnace to move the strip. The apparatus of detecting the defect in the hearth roll of the heat treating furnace comprises: a driving control unit connected with the driving motor to control a driving motor depending on a set rotation speed value, delivering feedback on the actual rotation speed of the driving motor, and outputting the actual rotation speed; and a logic control unit controlling the driving control unit depending on an input value through an interface, and detecting a defect by calculating a slip value of the hearth roll from a difference between the set rotation speed value of the driving motor applied from the driving control unit and the actual rotation speed value of the driving motor output from the driving control unit.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and apparatus for detecting a hurl roll abnormality in a heat treatment furnace,

The present invention relates to a detection device and a detection method for detecting an abnormality of a hustle roll supported and transported by a steel plate in a heat treatment furnace.

For example, in a cold rolling process, a heat treatment furnace including an annealing furnace and heat treating the strip at a high temperature is an important equipment that affects the quality of the product, and serves to determine the physical properties of the product through high temperature heat treatment of the strip.

In the annealing furnace, a strip passing through the inside is supported and a plurality of hearth rolls for conveying are installed with a gap therebetween. Since the annealing furnace heats the strip at about 800 to 1600 占 폚, the hustle roll installed inside the annealing furnace is bended due to high heat during long use, resulting in an abnormality.

When the hurl roll is bent, irregular linear velocity is generated, and the surface of the strip is defected by the hunting of the strip, so management of the inner hurl roll in the annealing furnace is very important. When surface defects of the strip occur, it is necessary to find out the number of hurso rolls in the annealing furnace and to take necessary measures.

Incidentally, there are more than 150 hiras rolls inside the annealing furnace, and abnormalities may occur in various places such as a motor and a gear box constituting the driving device of the hirasu roll, and the abnormal hirasu roll is detected in a short time There is a difficulty. In addition, it is difficult to directly observe the occurrence of defects in the quality of the product due to the abnormal hustling roll because it occurs inside the annealing furnace. These factors also make it difficult to detect hairs rolls that are abnormal in the annealing furnace.

Provided is a device for detecting abnormality of a hysteresis in a heat treatment furnace and a detecting method capable of detecting an abnormality of the hysteresis roll at an early stage.

Further, there is provided a device and method for detecting a hysteresis abnormality in a heat treatment furnace capable of more accurately and quickly detecting a hysteresis roll that has an abnormality among a plurality of imaginary rolls.

Further, there is provided a hirslop abnormality detecting apparatus and a detecting method, which can more precisely detect the cause of a product defect among various components constituting a hirse roll driving apparatus.

This embodiment is an apparatus for detecting a hysteresis abnormality in a heat treatment furnace for detecting an abnormality of a hust roll which is disposed in a space inside the heat treatment furnace and supports the strip and is rotated by a driving motor connected to one side to move the strip ,

A drive control unit connected to the drive motor to control the drive motor in accordance with the set rotational speed value and to feed back the actual rotational speed of the drive motor,

The slip value of the Hus Roll is calculated from the difference between the set rotation speed value of the drive motor applied to the drive control unit and the actual rotation speed value of the drive motor output from the drive control unit according to the value input through the interface And a logic controller for detecting an abnormality.

The detection device may further include a cause determination unit connected to the logic control unit to calculate whether the slip of the hurl roll is periodic to detect a cause of the hurl roll slip.

The logic control unit may be configured to store the calculation formula (1) therein and to calculate the slip value of the huskroll from the calculation formula (1). The equation (1) may be a slip value of the hustle roll = (a set rotation speed value applied to the drive motor - an actual rotation speed value of the drive motor) / (a set rotation speed value applied to the drive motor) * 100.

The logic controller may be configured to determine a hysteresis error when the slip value of the hysteresis obtained from the equation (1) is 2% or more.

The cause determining unit may be configured to store the calculation formula (2) therein and to calculate whether or not the periodicity of the hill roll slip is calculated based on whether the calculation formula (2) is satisfied. Equation (2) is the line speed at the time of hirsch roll slip occurrence * Hirsch roll slip occurrence 1 cycle = circumferential length of the hirsch roll

The detecting method of this embodiment is a method of detecting a hysteresis error in a heat treatment furnace for detecting an abnormality of a hust roll which is disposed in the heat treatment furnace at an interval and supports the strip and is rotated by a driving motor connected to one side, In this case,

Detecting the actual rotation speed of the drive motor with respect to the set rotation speed applied by the drive motor, and checking whether the hustle roll is slip from the difference between the set rotation speed value and the actual rotation speed value to detect an abnormality .

The abnormality detection step may include calculating whether the slip value of the hurl roll is equal to or greater than 2%. If the hurl roll slip value is equal to or greater than 2%, it may be determined that the hurl roll is equal to or greater than the hurl roll.

The detecting method may further include determining whether the slip of the abnormal hurl roll is periodic when the slip value of the hurl roll is 2% or more.

The detecting method may further include detecting a cause of the hustle roll slip when the slip of the hust roll is periodic.

In the abnormality detection step, the hustle roll slip value can be obtained from the equation (1). The equation (1) may be a slip value of the hustle roll = (a set rotation speed value applied to the drive motor - an actual rotation speed value of the drive motor) / (a set rotation speed value applied to the drive motor) * 100.

In the periodicity determination step, whether or not the periodicity of the Hurslol slip can be obtained from the establishment of the equation (2). Equation (2) is the line speed at the time of hirsch roll slip occurrence * Hirsch roll slip occurrence 1 cycle = circumferential length of the hirsch roll

The detecting method may further include a step of judging the abnormality of the driving motor when the arithmetic expression (2) is satisfied in the periodicity judging step, and judging that the abnormality of the driving motor is abnormal when the arithmetic expression (2) is not established .

As described above, according to this embodiment, it is possible to minimize the quality defects of the product by replacing the hurl roll which is abnormal in time, by detecting the hurl roll abnormality in the annealing furnace in an early stage.

In addition, it is possible to more quickly and accurately detect and correct the HEROS roll having an abnormality among a large number of HEROS rolls provided in the annealing furnace. Therefore, it is possible to minimize the time required for replacing and handling the hurl roll, and maximizing the productivity.

In addition, it is possible to precisely detect the abnormally generated portion among many components constituting the hurs roll driving device such as the hurs roll, the driving motor and the bearing, and to correct the cause of the above precisely.

Fig. 1 is a schematic view showing a huss roll abnormality detecting apparatus in a heat treatment furnace according to the present embodiment.
FIG. 2 is a schematic flowchart showing a process of detecting a huss roll abnormality in the heat treatment furnace according to the present embodiment.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the following description, the present embodiment describes a husk roll installed in an annealing furnace as an example of a heat treatment furnace. The present invention is not limited thereto and can be applied to all of the Hus rolls installed in all the heat treatment furnaces under the high temperature environment including the annealing furnace.

Fig. 1 is a schematic view showing a huss roll abnormality detecting apparatus in a heat treatment furnace according to the present embodiment.

As shown in Fig. 1, the strip S which is loosely moved in the inlet roll 10 is heat-treated through the annealing furnace 30 and then coiled to the outlet roll 20. In the interior of the annealing furnace (30), a plurality of horseshoes (40) are arranged with an interval. A drive motor 50 is connected to the end of the rotary shaft of each hustle roll 40. The driving motor 50 drives the Hus ' roll 40 to rotate according to the set control value. The horseshoe roll 40 supports the lower end of the strip S and rotates at a constant speed to move the strip.

If an abnormality occurs in the husk roll portion or the driving portion during the operation of the annealing furnace (30), the husk roll slip may occur and cause a defect on the surface of the strip. The horseshoe roll portion in the following description refers to the horseshoe roll itself, the horseshoe roll itself such as a horseshoe roll, a bearing, a driving motor, a joint, a gearbox, etc., And the driving part means a constituent part of the driving motor, such as a driving motor and a gear box.

 The detecting apparatus of the present embodiment can detect the abnormality of the hurl roll at an early stage and minimize surface strip defects caused by hurl roll abnormality.

To this end, the detection device 60 of the present embodiment includes a drive control unit 62 connected to the drive motor 50 for controlling the drive motor in accordance with a set rotational speed value and for feedback-outputting the actual rotational speed of the drive motor, The drive control unit 62 is controlled according to the value input through the interface 66 and the set rotation speed value of the drive motor applied to the drive control unit 62 and the actual rotation speed of the drive motor output from the drive control unit 62 And a logic control unit 64 for calculating a slip value of the hurl roll from the difference in the speed values and detecting an abnormality.

The interface 66 is connected to the logic controller 64 and provides a setting screen and an operation switch for communication between the logic controller 64 and the operator of the apparatus. A signal is input to the logic controller 64 through the interface 66 to set the rotational speed of the driving motor to a predetermined value. In addition, the value calculated by the logic control unit 64 is outputted through the interface 66. [ Thus, the operator can confirm whether or not each of the hurs rolls is abnormal through the interface 66.

As shown in FIG. 1, the drive control unit 62 is connected to a drive motor of each huselol, and drives the drive motor 50 according to a control signal output from the logic control unit 64. The drive control unit 62 includes an ASR (Automatic Speed Regulator) therein. The drive control unit 62 applies an output signal corresponding to the set rotation speed value applied from the logic control unit 64 to the drive motor, To the logic controller (64).

The logic control unit 64 controls the entire apparatus for driving the horseshoe roll. The logic controller 64 is connected to the drive controller 62 and applies a control signal to the drive controller 62 according to the rotation speed value of the drive motor set via the interface 66. The logic controller 64 receives the actual rotation speed value of the drive motor from the drive control unit 62 and calculates the deviation between the set rotation speed value and the actual rotation speed value. And outputs to the outside through the interface 66 whether or not each hurse roll is abnormal.

The present apparatus can detect whether or not each of the hurs rolls is slip through a deviation between the set rotation speed value and the actual rotation speed value of the drive motor calculated by the logic controller 64. [

The logic controller 64 stores an arithmetic expression (1) for calculating whether or not the hustle slip is internally stored as internal data. Thus, the logic controller 64 calculates the slip value of the Hus Roll from the arithmetic expression (1) previously stored therein.

In the present embodiment, the calculation formula (1) is based on the slip value of the hustle roll = (the set rotation speed value applied to the drive motor - the actual rotation speed value of the drive motor) / (the set rotation speed value applied to the drive motor) 100. * Denotes multiplication. The logic control unit 64 may be configured to determine the abnormality of the Hus Roll if the slip value of the Hus Roll obtained from the equation (1) is 2% or more. When the reference value is lower than 2%, the usable hus-roll is also required to be repaired or replaced. When the hus-roll is set higher than 2%, the hus- It is not detected early and quality defect of the strip occurs.

The detection device 60 further includes a cause determination unit 68 connected to the logic control unit 64 to calculate whether the slip of the hurl roll is periodic to diagnose the cause of the hurl slip more accurately .

The apparatus can more precisely diagnose and confirm whether the hysteresis slip problem confirmed by the logic control unit 64 through the cause determination unit 68 is caused by any of the components of the driving apparatus of the hurs roll .

The cause determination unit 68 stores the operation formula (2) for determining the cause as internal data. Therefore, the cause determining unit 68 has a structure for calculating whether or not the hysteresis slip is periodic by checking whether the arithmetic expression (2) previously stored therein is satisfied. In the present embodiment, the calculation formula (2) may be a line speed at the time of the occurrence of the hurl slip, or 1 period of the occurrence of the hurl roll slip = the circumferential length of the hurl roll. * Denotes multiplication. The reason determining unit 68 determines that the slip of the hurl roll is periodic when the calculation formula (2) is established, and when the calculation formula (2) is not established, the reason determination unit (68) It is judged that the slip is aperiodic. The equation is satisfied when the line speed at the time of the slip of the slip roll * the value of the slip at the slip of the slip is equal to the circumferential length of the slip of the slip, It means that the value of the period does not match the circumferential length value of the hustle roll.

The cause determiner 68 checks whether the period of the slip of the slip is regular or not through the calculation formula (2), and if the slip of the slip finally occurs, the cause of the slip is the cause of the slip, . Also, the cause determination unit 68 outputs that the cause of the hustle roll slip is the driving portion such as the drive motor or the gear box when the hustle roll slip is aperiodic. The logic control unit 64 receives the output signal of the cause determination unit 68 and displays the specific cause of the overload via the interface 66. For example, when the hurl roll itself is bent by the banding, the convex portion has a high linear velocity and the concave portion rotates relatively slowly, resulting in a Hurst roll slip at a constant cycle. Therefore, the cause determination unit 68 determines whether the cause of the hurdle roll is caused by the periodicity analysis of the hurl roll slip or not, such as the deterioration of the drive motor or the mechanical problem of the spindle, .

Hereinafter, a process of early detection of the hurl roll abnormality of the present embodiment will be described with reference to FIG.

The driving motor is controlled and driven according to the line speed set through the interface 66 and the rotational speed of the husel roll to transfer the strip inside the annealing furnace 30. [

During the annealing process, the actual rotation speed value of the drive motor, that is, the actual rotation speed value of the hustle roll, is continuously monitored and fed back (S100)

The logic controller 64 calculates a deviation between the set rotation speed value applied to the drive motor and the actual rotation speed value in the annealing process to check whether the slip of the hurl roll is abnormal (S110)

The logic controller calculates (computes) the actual rotation speed value of the drive motor / (the set rotation speed value applied to the drive motor) * 100 (the set rotation speed value applied to the drive motor - the actual rotation speed value of the drive motor) The slip value of the Hus Roll can be obtained.

The logic controller 64 may be configured to determine an error of the hysteresl roll when the slip value of the hurl roll obtained from the equation (1) is 2% or more. (S120) If the reference value is lower than 2%, it is necessary to repair or replace the usable hurs roll. If the reference value is higher than 2%, the hurs roll abnormality can not be detected early and the quality defect of the strip Lt; / RTI >

The logic controller 64 judges that the slip value of the calculated hurl roll is not less than the hurl roll slip when the calculated slip value is 2% or more.

The reason determining unit 68 determines the cause of the hurl roll slip or not by checking the periodicity of the hurl roll slip. (S130) ), It is possible to determine whether the circumferential length of the hurl roll is periodic by calculating whether the circumferential length of the hurl roll is equal to one cycle of the line speed * hurl roll slip occurrence when the hurl roll slip occurs. For example, if the diameter of the hustle roll is 150 mm, the circumference length is 0.471 m (3.14 * 0.15 m). If the 1 cycle value of occurrence of hunting according to the hurl roll slip is A and the line speed at the occurrence of the hurl slip is B, the value of A * B is compared with 0.471m, and it is judged that the hurl roll slip is periodic. On the contrary, if the value of A * B is different from 0.471 m, it is judged that the husk roll slip is aperiodic (S140)

The method of the present embodiment finally determines the cause of the abnormality of the Hus Roll Slip by judging whether or not the Hus Roll Slip is periodic. That is, if the detected hurdle roll slip is more than cycle, it is determined that the cause of the hurl roll slip is in the hurl roll or in the hurl roll portion such as the bearing (S150) It is determined that the cause of the hustle roll slip is in the driving portion of the driving motor, the gear box, etc. (S160)

As described above, according to the present embodiment, it is possible to detect whether or not an abnormality has occurred in each of the hurls, and it is possible to specifically confirm the cause of the abnormality.

While the illustrative embodiments of the present invention have been shown and described, various modifications and alternative embodiments may be made by those skilled in the art. Such variations and other embodiments will be considered and included in the appended claims, all without departing from the true spirit and scope of the invention.

30: annealing furnace 40: Hus Roll
50: drive motor 60: detection device
62: drive control unit 64: logic control unit
66: interface 68: cause determination unit

Claims (12)

An apparatus for detecting an anomaly of a heat treatment furnace in a heat treatment furnace for detecting an abnormality of a hustle roll which is disposed at an interval in a heat treatment furnace and supports a strip and is rotated by a driving motor connected to one side to move a strip,
A drive control unit connected to the drive motor to control the drive motor in accordance with the set rotational speed value and to feed back the actual rotational speed of the drive motor,
The slip value of the Hus Roll is calculated from the difference between the set rotation speed value of the drive motor applied to the drive control unit and the actual rotation speed value of the drive motor output from the drive control unit according to the value input through the interface And a logic controller
And a hysteresis detector for detecting a hysteresis error in the heat treatment furnace. The method according to claim 1,
Wherein the logic control unit stores the calculation formula (1) in the inside and calculates the slip value of the Hus Roll from the calculation formula (1).
(1) is the slip value of the hustle roll = (set rotation speed value applied to the drive motor - actual rotation speed value of the drive motor) / (set rotation speed value applied to the drive motor) * 100] . 3. The method of claim 2,
Wherein the logic control unit judges the abnormality of the hust roll when the slip value of the hust roll obtained from the equation (1) is 2% or more. 4. The method according to any one of claims 1 to 3,
Further comprising a cause determination unit coupled to the logic control unit to calculate whether the slip of the hurl roll is periodic to detect a cause of the hurl roll slip. 5. The method of claim 4,
Wherein the cause determination unit stores the calculation formula (2) therein and calculates whether or not the period of the hirlslip is calculated based on whether the calculation formula (2) is established.
The above equation (2) is [line speed at the time of occurrence of hurl slip occurrence * one cycle of hurl roll slip occurrence = circumferential length of hurl roll]. A method for detecting an anomaly of a heat treatment furnace in a heat treatment furnace for detecting an abnormality of a hustling roll which is disposed at an interval in a heat treatment furnace and supports the strip and is rotated by a driving motor connected to one side to move the strip,
A rotational speed detecting step of detecting an actual rotational speed of the drive motor with respect to a set rotational speed applied to the drive motor,
An abnormality detecting step of detecting an abnormality by checking whether the hustle roll is slip from the difference between the set rotation speed value and the actual rotation speed value
And the hue roll abnormality detection method. The method according to claim 6,
Wherein the abnormality detecting step includes a step of calculating whether the slip value of the hurl roll is 2% or more, and when the hurl roll slip value is 2% or more, the hurdle roll abnormality determination is performed. 8. The method of claim 7,
Wherein, in the abnormality detection step, the hustle roll slip value is obtained from an arithmetic expression (1).
(1) is the slip value of the hustle roll = (set rotation speed value applied to the drive motor - actual rotation speed value of the drive motor) / (set rotation speed value applied to the drive motor) * 100] . 9. The method of claim 8,
Wherein the detection method further comprises a periodicity determination step of determining whether the slip of the abnormal hurl roll is periodic when the slip value of the hurl roll is 2% or more. 10. The method according to any one of claims 6 to 9,
Wherein the detecting method further comprises detecting a cause of the occurrence of the hurl roll slip when the slip of the hurl roll is periodically detected. 11. The method of claim 10,
Wherein, in the periodicity determination step, whether or not the periodicity of the hurs roll slip is determined is determined based on whether the equation (2) is satisfied.
The above equation (2) is [line speed at the time of occurrence of hurl slip occurrence * one cycle of hurl roll slip occurrence = circumferential length of hurl roll]. 12. The method of claim 11,
(2) is determined to be equal to or greater than the hysteresis side, and when the arithmetic expression (2) is not satisfied, it is determined to be equal to or higher than the drive motor side, Detection method.

Images