KR19980084800A - Apparatus and method for diagnosing hot rolled strip entry in hot rolled down coils - Google Patents

Abstract

The present invention is a hot roll strip pull-in state diagnosis apparatus that can directly detect the impact of the strip end by directly attaching the unit roll end detector to the unit roll, the shock applied by the hydraulic device to improve the accuracy of the tracking of the strip end; It is about a method. An apparatus for diagnosing a hot rolled strip in a state according to the present invention includes: an upper pinch roll for transmitting a hot roll strip state; a pinch roll end detector for detecting an introduction of a strip end from vibration of the upper pinch roll; A pulse logic generator for measuring the speed, a unit roll for transmitting the pulled state of the hot rolled strip passing through the upper pinch roll, and a unit roll tip detector attached directly to the unit roll to detect the entry of the strip tip from the vibration; Jig is provided with a jig so that the bottom surface of the unit roll leading edge detector is parallel to the unit roll frame, the method for diagnosing the hot roll strip state according to the present invention is the unit roll arrival prediction time (C _t ) of the strip and the actual unit roll determined is less than the arrival time _(t U) absolute predetermined value is a difference (a) of or equal to that drawn strips have a fair Stage manner, it is possible to improve the accuracy of the tracking tip (Tracking) of the strip.

Description

Apparatus and method for diagnosing hot rolled strip entry in hot rolled down coils

The present invention relates to an apparatus and a method for diagnosing a hot rolled strip in a hot rolled down coil, and in particular, by attaching a unit roll end detector directly to a unit roll work side to directly detect an impact caused by a strip end and an impact applied by a hydraulic system. The present invention relates to an apparatus and method for diagnosing a hot strip stripped state in a hot rolled down coil, which can be alleviated to improve the accuracy of strip tip tracking.

The apparatus for diagnosing a hot rolled strip in a hot rolled down coil according to the related art is illustrated in FIG. 1, and FIG. 1 is a schematic view illustrating a apparatus for diagnosing a hot rolled strip in a conventional hot rolled down coil.

Referring to FIG. 1, the hot roll strip pull-in state diagnosis apparatus in the hot rolled down coiler according to the related art transmits the pull-in state of the hot roll strip 11 and leads to the next step, the upper pinch roll 12 and the upper pinch roll. A pinch roll tip detector 13 for detecting the leading of the strip from the vibration of (12), a pulse logic generator (PLG) 15 for measuring the speed of the strip from the lower pinch roll 14, Transmitting the pulled state of the hot rolled strip 11 passing through the upper pinch roll 12, and the unit roll 16 to be guided to the next step, and attached to the rear of the uni-roll frame to detect the pull-in of the strip end from the vibration The unit roll tip detector 17, the unit roll frame 18 supporting the unit roll 16, and the unit roll 16 and the unit roll frame 18 between the unit roll 16 and the unit roll frame 18. Absorb the mechanical shock of the frame 18 The spring device 19, the hydraulic device 20 for adjusting the distance between the unit roll 16 and the mandrel 29, and the opening of the unit roll 16 by the hydraulic device 20 ( A unit roll position sensor 21 for detecting the degree of open / close and a mandrel 29 for winding the strip passing through the unit roll 16.

In the conventional hot rolled down coiler configured as described above, the hot roll strip entry state diagnosis device has a front end detector for tracking the end of the strip attached to the rear of the unit roll frame. When the pressure is applied, the impact is detected by the tip detector as it is, and only the impact due to the introduction of the unit roll of the strip cannot be detected. Therefore, the reliability of the unit roll tip detector is caused.

In the prior art as described above, the impact applied by the hydraulic device acts as a noise element, and thus, the accuracy of tracking of the strip tip is reduced.

The present invention has been made to solve the above problems and to achieve an improvement.

Therefore, an object of the present invention is to directly detect the impact caused by the end of the strip, the impact applied by the hydraulic system to mitigate the impact on the hot rolled strip coil in the hot rolled down coil which can improve the accuracy of the tracking of the end of the strip An apparatus and method are provided.

1 is a schematic view showing a hot roll strip pull-in state diagnosis apparatus in a conventional hot rolled down coil.

Figure 2 is a schematic diagram showing a hot roll strip pull-in state diagnosis apparatus in a hot rolled down coil according to the present invention.

3A is a front view of a detailed installation diagram of the unit roll tip detector of FIG. 2.

3B is a side view of a detailed installation diagram of the unit roll tip detector of FIG. 2.

4 is a flowchart showing a method for diagnosing a hot rolled strip in a hot rolled down coil according to the present invention.

* Description of the symbols for the main parts of the drawings *

11: strip 12: upper pinch roll

13: pinch roll tip detector 14: lower pinch roll

15: pulse logic generator 22: unit roll

23: unit roll tip detector 24: jig

25: unit roll frame 26: spring device

27: hydraulic system 28: unit roll position sensor

29: mandrel

As a technical means for achieving the above object of the present invention, in the hot rolled down coiler according to the present invention, the hot roll strip pull-in state diagnosis apparatus is an upper pinch roll for transmitting the pulled state of the hot roll strip and from the vibration of the upper pinch roll A pinch roll tip detector for detecting the leading of the strip, a pulse logic generator (PLG) for measuring the speed of the strip from the lower pinch roll, a unit roll for transferring the pulled state of the hot rolled strip passing through the upper pinch roll; A unit roll tip detector attached directly to the unit roll to detect the entry of the strip tip from the vibration, a jig for the bottom surface of the unit roll tip detector to be flush with the unit frame, and a unit roll for supporting the unit roll Between the frame and the unit roll and the unit roll frame, A spring device for absorbing mechanical shock, a hydraulic device for adjusting the distance between the unit roll and the mandrel, and a unit roll position for detecting the degree of open / close of the unit roll by the hydraulic device With a sensor and a mandrel wound around the strip passing through the unit roll, the impact caused by the front end of the strip can be directly detected, and the impact applied to the hydraulic device can be alleviated to improve the accuracy of the front end tracking of the strip.

In addition, as another technical means for achieving the above technical problem, the hot roll strip pull-in state diagnosis method in the hot rolled down coiler according to the present invention and the first step of detecting the pinch roll arrival time (P _t ) of the strip; And a second step of obtaining the prediction time U _{et at} which the strip arrives from the pinch roll to the unit roll, and the pinch roll obtained in the second step on the pinch roll arrival time P _t of the strip detected in the first step. A third step of obtaining the estimated unit roll arrival time (C _t ) of the strip by adding the estimated time (U _et ) of the strip arrival to the unit roll, and a fourth detecting the unit roll arrival time (U _t ) of the actual strip. And the difference between the absolute value of the unit roll arrival time (C _t ) of the strip obtained in the third step and the unit roll arrival time (U _t ) of the actual strip detected in the fourth step is the unit roll for the hydraulic system. Yes A fifth step of determining whether the open clearance distance L considering the sex is less than or equal to a constant value A obtained by dividing the strip V by the speed V of the strip; and a value having a constant difference between the absolute values in the fifth step. A sixth step of diagnosing strip entry is appropriate if less than or equal to (A), and a seventh step of diagnosing strip entry is inappropriate if the difference in absolute value is greater than a constant value (A) in the fifth step The accuracy of tracking the tip of the strip can be improved.

Hereinafter, a configuration of a hot roll strip pull-in state diagnosis apparatus in a hot rolled down coiler according to the present invention will be described with reference to FIGS. 2, 3A, and 3B.

Figure 2 is a schematic diagram showing a hot roll strip pull-in state diagnosis apparatus in a hot rolled down coil according to the present invention, Figure 3a is a front view of a detailed installation of the unit roll tip detector of Figure 2, Figure 3b is a unit roll of Figure 2 It is a side view of the detailed installation drawing of a front end detector.

In the hot rolled down coiler according to the present invention, the hot roll strip pull-in state diagnosis apparatus transmits the pull-in state (time, speed, position) of the hot roll strip 11 and leads to the next step. A pinch roll tip detector 13 for detecting the inlet of the strip tip from the vibration of the pinch roll 12, a pulse logic generator (PLG) 15 for measuring the speed of the strip from the lower pinch roll 14, and the upper portion The unit roll 22 which transmits the pulling state (time, position) of the hot rolled strip 11 which passed through the pinch roll 12, and guides to the next stage, is directly attached to the unit roll 22, A unit roll tip detector 23 for detecting the inlet of the strip tip, a jig 24 for leveling the bottom surface of the unit roll tip detector 23 with the unit frame 25, and the unit roll 22 A unit roll frame 25 for supporting the unit roll 22 and the unit roll 22 Spring device 26 is installed between the nitro roll frame 25 to absorb the mechanical impact of the unit roll frame 25 by the strip, and for adjusting the distance between the unit roll 22 and the mandrel 29 Hydraulic device 27, a unit roll position sensor 28 for detecting the open / close degree of the unit roll 22 by the hydraulic device 27, and the unit roll 22 It consists of a mandrel 29 winding the strip passed through.

Here, reference numeral 30 in the figure denotes a unit roll support bearing, and 31 denotes a unit roll support shaft.

Hereinafter, a configuration of a method for performing a hot roll strip pull-in state diagnosis method in a hot rolled down coiler according to the present invention will be described with reference to FIG. 4.

4 is a flowchart showing a method for diagnosing a hot rolled strip in a hot rolled down coil according to the present invention.

In the hot rolled strip coil according to the present invention, a method for diagnosing a hot roll strip entry state includes a first step (41) of detecting a pinch roll arrival time (P _t ) of a strip, and a distance (D) between a pinch roll and a unit roll. The second step 42 of obtaining the predicted time U _{et at} which the strip arrives from the pinch roll to the unit roll by dividing by the speed V, and the pinch roll arrival time P _t of the strip detected in the first step. A third step (43) of obtaining the estimated unit roll arrival time (C _t ) of the strip by adding the predicted time (U _et ) that the strip reaches from the pinch roll obtained in the second step to the unit roll; A fourth step 44 of detecting the arrival time U _t , a unit roll arrival prediction time C _{t of the} strip obtained in the third step and a unit roll arrival time of the actual strip detected in the fourth step ( The absolute difference in U _t ) is the response of the unit roll to the hydraulic system. A difference between the absolute value in the fifth step 45 and the fifth step in which the open clearance distance L considering the sex is smaller than or equal to a constant value A obtained by dividing the strip V by the speed V of the strip; Is a step less than or equal to a constant value (A), the sixth step (46) for diagnosing strip stripping is appropriate, and if the difference in absolute value in the fifth step is greater than a certain value (A), diagnosing strip stripping is inappropriate. It comprises a seventh step (47).

The operation according to the hot-rolled strip pull-in state diagnosis apparatus in the hot-rolled down coiler according to the present invention configured as described above will be described in detail below with reference to FIGS. 2, 3A, 3B and 4.

Figure 2 is a schematic diagram showing a hot roll strip pull-in state diagnosis apparatus in a hot rolled down coil according to the present invention, Figure 3a is a front view of a detailed installation of the unit roll tip detector of Figure 2, Figure 3b is a unit roll of Figure 2 It is a side view of the detailed installation diagram of a front end detector, and FIG. 4 is a flowchart which shows the hot-roll strip pull-out state diagnosis method in the hot-rolled down coil by this invention.

When the strip 11 enters the upper pinch roll 12, the position of the strip is detected by the pinch roll tip detector 13 from the vertical vibration of the upper pinch roll 12, and the lower portion of the pulse logic generator (PLG) 15 The speed V of the strip is measured from the pinch roll 14. In the first step, the pinch roll arrival time P _t of the strip is detected by dividing the distance to the pinch roll by the speed V of the strip (41). The predicted time U _{et at} which the strip reaches from the pinch roll to the unit roll in the second step is calculated by Equation 1 below (42).

[Equation 1]

U _et = , D: Distance between pinch roll and unit roll, V: Strip speed

In the third step, the unit roll arrival prediction time C _t is obtained by using Equation 2 below (43).

[Equation 2]

C _t = P _t + U _et , P _t : Time to reach pinch roll of strip, U _et : Estimated time to reach strip from pinch roll to unit roll

When the strip 11 passing through the upper pinch roll 12 reaches the unit roll 22, the unit roll tip detector 23 directly attached to the unit roll 22 is released from the vibration of the unit roll 22. Detect the leading edge of the strip. The jig 24 serves to level the bottom surface of the unit roll tip detector 23 with the unit frame 25. In the fourth step, the actual unit roll arrival time U _t is detected by dividing the distance to the unit roll by the speed V of the strip (44). In the fifth step, it is determined that the strip entry is appropriate according to Equation 3 below (45).

[Equation 3]

│ C _t -U _t │ ≤ A, C _t : Estimated time of unit roll arrival of strip, U _t : Time of arrival of unit roll of actual strip, A: Constant value

The constant value (A) is obtained by dividing the open clearance distance (L) by considering the responsiveness of the unit roll to the hydraulic system by the speed (V) of the strip, and the constant value (A) in the facility of the present invention It used at the speed (V) of 200 mm / strip. In step 6, if the difference between the absolute value of the fifth step is less than or equal to the constant value A, the strip insertion is appropriate (46). In the seventh step, the difference between the absolute values is constant in the fifth step. If greater than the value A, the strip entry is diagnosed as inappropriate (47). The spring device 26 is installed between the unit roll 22 and the unit roll frame 25 supporting the unit roll 22 to absorb mechanical shock of the unit roll frame 25 by the strip, and the hydraulic device 27 adjusts the distance between the unit roll 22 and the mandrel 29, and the unit roll position sensor 28 opens / closes the unit roll 22 by the hydraulic device 27. Detect the degree of close. The mandrel 29 winds up the strip passing through the unit roll 22.

In the drawings referred to in the present invention, components having substantially the same configurations and functions in the prior art and the present invention have the same reference numerals.

According to the present invention as described above, by attaching a unit roll tip detector directly to the unit roll work side to directly detect the impact caused by the strip tip, to mitigate the impact applied by the hydraulic device, thereby reducing the tracking of the tip of the strip Improved accuracy has the effect of promoting a smooth winding operation.

In addition, another effect according to the present invention can contribute to the improvement of the initial winding degree because it is possible to compare and analyze the adequacy of the strip winding control in the case of winding the hot rolled strip by tracking the position of the tip only by the tip detector of the current pinch roll. .

The above description is merely a description of one embodiment of the present invention, the present invention can be variously modified and modified within the scope and configuration of the technical idea.

Claims (4)

In the hot roll strip pull-in state diagnosis apparatus in the hot rolled down coil, An upper pinch roll 12 which transmits the pulling state (time, speed, position) of the hot rolled strip 11 and leads to the next step, A pinch roll tip detector 13 for detecting the leading of the strip tip from the vibration of the upper pinch roll 12; A pulse logic generator (PLG) 15 for measuring the speed of the strip from the lower pinch roll 14, Deliver the drawing state (time, position) of the hot rolled strip 11 passed through the upper pinch roll 12, The unit roll 22 leading to the next step, A unit roll tip detector 23 attached directly to the uni-roll 22 to detect the entry of the strip tip from the vibration; Jig (24) such that the bottom surface of the unit roll tip detector (23) is flush with the unit frame (25), A unit roll frame 25 supporting the unit roll 22, A spring device (26) installed between the unit roll (22) and the unit roll frame (25) to absorb mechanical impact of the unit roll frame (25) by a strip; Hydraulic device 27 for adjusting the distance between the unit roll 22 and the mandrel 29, A unit roll position sensor 28 for detecting an open / close degree of the unit roll 22 by the hydraulic device 27; Hot rolled strip pull-in state diagnosis apparatus in the hot rolled down coil characterized in that it comprises a mandrel (29) winding the strip passing through the unit roll (22). In the hot-rolled strip pulley coil diagnostic method, A first step 41 of detecting the pinch roll arrival time P _t of the strip, A second step 42 of obtaining the predicted time U _{et at} which the strip arrives from the pinch roll to the unit roll by dividing the distance D between the pinch roll and the unit roll by the strip speed V; The pin roll roll arrival time P _t of the strip detected in the first step is added to the predicted time U _{et at} which the strip arrives from the pinch roll to the unit roll obtained in the second step. A third step 43 of obtaining C _t ), A fourth step 44 of detecting the actual unit roll arrival time U _t of the strip; The difference between the absolute value of the unit roll arrival time (C _t ) of the strip obtained in the third step and the unit roll arrival time (U _t ) of the actual strip detected in the fourth step is less than or equal to a constant value (A). A fifth step 45 of judging, A sixth step 46 for diagnosing strip entry is appropriate if the difference in absolute values in the fifth step is less than or equal to a constant value A; And a seventh step (47) of diagnosing strip inadequateness when the difference in absolute value is greater than a predetermined value (A) in the fifth step. The method according to claim 2, wherein the constant value (A) is obtained by dividing the open clearance distance (L) in consideration of the responsiveness of the unit roll to the hydraulic system by the speed (V) of the strip. Method of diagnosing hot rolled strip entry in air. 4. A method according to claim 2 or 3, wherein said constant value (A) is a speed (V) of 200 mm / strip.