KR101461478B1 - Apparatus and method for measuring length of strip tail - Google Patents

Abstract

The present invention relates to an apparatus for measuring the length of a strip tail. The apparatus includes: a mandrel which uncoils a strip, wound around an outer circumferential side thereof, by rotation; a shear which is installed on one side of the mandrel and cuts the strip uncoiled from the mandrel; a pinch roll which is installed between the mandrel and the shear and changes the direction of the strip so as to make the uncoiled strip move toward the shear; and a controlling part which calculates the length of the strip tail when the strip tail is located on a mandrel distillation location (A), and drives the shear so as to cut the strip into a predetermined size.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for measuring a length of a rear end of a strip,

The present invention relates to an apparatus for measuring the length of a strip rear end, and more particularly, to a strip length measuring apparatus for measuring the length of a strip rear end portion by measuring a load current of a mandrel driving motor, a speed of a mandrel driving motor, or an expansion state of a mandrel expanded cylinder And a length measuring device for measuring a length of a rear end of the strip.

Generally, in a cold rolling process for producing a product using a hot-rolled coil, when the strip supplied to the rear end of the preceding strip and the end of the preceding strip or the line is cut to continuously feed the strip so that the continuous operation is performed, The cutting surface is welded and when the strip is welded, the rear end of the preceding strip is advanced in the reverse direction so as to flow into the welder. That is, as shown in FIG. 1, a hot-rolled coil supplied by a coil car (not shown) is mounted on a payoff reel (No. 1 POR, No. 2 POR) The leading edge of the trailing strip is cut at the shear so that the weldability is good, and then supplied to a welding machine (Laser Welder).

In the conventional strip tail cutting apparatus, when the mandrel expanded cylinder is opened after the hot-rolled coil is drawn into the pay-off reel, the length calculated from the outer diameter of the drawn hot-rolled coil is subtracted from the length calculated by the inner diameter of the coil, The length of the stem is calculated. Here, at the time of uncoiling, when the coil of one wheel wound on the uncoiler is released, the thickness of the coil is subtracted from the outer diameter of the coil, and then the above process is repeated to calculate the length of the coil.

However, in such a case, the inner air layer or scale remains between the coils wound on the uncoiler, so that the calculated stagnation length of the coils and the actual remaining length become inconsistent. Thus, when the photo sensor installed at the rear of the uncoiler senses the strip tail, the physical distance between the photo sensor and the input sheer is set as the coil length of the coil, and the strip tail is cut at the entrance shear.

For example, when the distance from the photosensor installed at the back of the uncoiler to the entrance sheath is 4890 mm, when the coil drawn into the uncoiler is completely unwound, the strip tail is cut to 0.6 mm at the entrance sheath, It is allowed within range and there is no problem. However, when 9 or more strip tails are cut at 0.6M, the distance is 5400mm, which is more than 4890mm. Therefore, a method of cutting a strip tail of a coil by a photosensor can not be applied. In this case, the length of the coil should be calculated using the outer diameter and the inner diameter of the coil wound around the uncoiler. At this time, the length of the coil can not be accurately measured due to the air layer and the scale remaining between the coils wound on the uncoiler . Therefore, the length of the coil due to the error occurs, and the length of the coil is about 1% of the total length of the entire rods, and the entire amount is scrapped.

Therefore, since the length of the strip tail of the coil can not be measured accurately, the rate of cold rolling is reduced due to an increase in the amount of hot rolled material scrap and the number of pieces of cut material is reduced to about 15 pieces. there is a problem.

Korean Utility Model Registration No. 20-0215189 (registered on March 23, 2001)

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus for measuring the length of a strip rear end portion that can accurately measure the length of a strip rear end uncoiled in a mandrel.

According to an aspect of the present invention, there is provided a stapler comprising: a mandrel for uncoiling a strip wound on an outer circumferential surface by rotation; A sheath disposed at one side of the mandrel and cutting the strip to be uncoiled from the mandrel; A pinch roll disposed between the mandrel and the sheath for switching the direction of the strip such that the uncoiled strip advances to the sheath; And a control unit for calculating the length of the rear end of the strip when the end of the strip is located at the release position A of the mandrel and driving the shear to cut the strip to a predetermined length. Device.

The apparatus includes a driving motor connected to the mandrel and providing a rotational driving force to the mandrel to rotate the mandrel; Further comprising a speed sensor connected to the driving motor and configured to transmit a measurement speed at which the rotation speed of the driving motor is measured, wherein the control unit determines that the difference between the measured speed and the predetermined speed, , It can be determined that the end of the strip is located at the release position (A) of the mandrel.

The length measuring device of the strip rear end portion is connected to the mandrel and provides a rotational driving force to the mandrel so as to rotate the driving motor. A power supply connected to the driving motor and supplying power to the driving motor; And a current sensor connected to the drive motor and the power supply unit and measuring a load current which is a current flowing from the power supply unit to the drive motor, wherein the control unit controls the load current, It can be determined that the end of the strip is located at the release position A of the mandrel.

In addition, the mandrel may include a central axis that is longitudinally movable; A third segment disposed around the central axis and extending or contracting in a lateral direction with respect to the longitudinal direction of the central axis as the central axis moves; A plate disposed on an outer circumferential surface of the center shaft and disposed at a predetermined position of the center shaft; And a distance sensor installed at one side of the central axis for measuring and transmitting the distance to the plate, wherein when the distance from the distance sensor to the plate is less than a predetermined distance, Is located at the release position (A) of the mandrel.

The apparatus further comprises a drive motor connected to the mandrel and providing rotational driving force to the mandrel to rotate the mandrel, A power supply connected to the driving motor and supplying power to the driving motor; A speed sensor connected to the driving motor for transmitting a measuring speed measuring a rotating speed of the driving motor; And a current sensor connected to the drive motor and the power supply unit and measuring a load current, which is a current flowing from the power supply unit to the drive motor, wherein the mandrel includes: a center shaft movable in the longitudinal direction; A third segment disposed around the central axis and extending or contracting in a lateral direction with respect to the longitudinal direction of the central axis as the central axis moves; A plate disposed on an outer circumferential surface of the center shaft and disposed at a predetermined position of the center shaft; And a distance sensor installed at one side of the central axis for measuring and transmitting the distance to the plate, wherein the control unit determines that the difference between the measured velocity transmitted from the velocity sensor and the predetermined velocity is equal to or greater than a first reference value Wherein when the difference between the load current transmitted from the current sensor and a predetermined value is equal to or less than a second reference value and the distance from the distance sensor to the plate is greater than a predetermined distance, It can be determined that it is located at the release position A. [

The mandrel may include a first segment having a first inclined surface on an outer circumferential surface, the inclined surface being formed in a longitudinal direction of the central axis, the first segment being coupled to the center axis; And a second segment fixedly installed around the first segment and having a second inclined surface having an inclination the same as the first inclined surface on the inner circumferential surface, wherein the third segment is coupled to the periphery of the second segment And the first inclined surface moves along the second inclined surface by the movement of the central axis so that it can expand or contract in the transverse direction with respect to the longitudinal direction of the central axis.

The first segment has a plurality of first slant projections protruded from the outer circumferential surface, the second segment has a plurality of second slant projections protruding from the inner circumferential surface, and the first slant surface and the second slant surface May be formed at one end of each of the first slant projection and the second slant projection.

In addition, the apparatus for measuring the length of the rear end of the strip includes: a cylinder having one end opened and having a moving hole for adjusting the pressure of the inner space; A piston installed in the internal space of the cylinder and movable in the longitudinal direction of the cylinder due to the pressure of the internal space; And a driving pump connected to the moving hole and adjusting a pressure of the inner space by introducing or discharging gas or fluid into the inner space through the moving hole.

The effect of the length measuring device of the strip rear end according to the present invention will be described as follows.

First, there is an advantage that the rate of cold rolling can be improved by accurately measuring the length of the ridge of the strip tail.

Second, by accurately measuring the length of the ridge of the strip tail, it is possible to reduce the handling time on the entry side, thereby improving the productivity.

Fig. 1 is an overall process view of a facility for cold-rolling a hot-rolled coil.
2 is a configuration diagram of an apparatus for measuring the length of a rear end of a strip according to an embodiment of the present invention.
3 is a control block diagram of an apparatus for measuring the length of a strip rear end according to an embodiment of the present invention.
4 is a control block diagram of a power section of an apparatus for measuring the length of a strip rear end according to an embodiment of the present invention.
5 is a view illustrating a state in which a mandrel is contracted according to an embodiment of the present invention;
FIG. 6 illustrates a state in which a mandrel is expanded according to an embodiment of the present invention. FIG.
7 is a view showing a state where an end of a strip S is positioned at a release position A according to an embodiment of the present invention.
8 is a view showing the load current measured by the drive motor according to the present embodiment.
9 is a view showing the rotational speed measured by the drive motor according to the present embodiment.
10 is a view showing a distance measured by the distance sensor when the mandrel is expanded according to the present embodiment;
11 is an output view showing a state where the end of the strip S is sensed according to an embodiment of the present invention.

First, when a coil in which the strip S is wound is drawn into the mandrel 100, the mandrel 100 is extended to seat the coil on the mandrel 100. Thereafter, the trailing end of the preceding coil and the leading end of the trailing coil are joined by a welder.

When a tension is applied to the mandrel 100, the coils wound around the mandrel 100 are slightly loosened by driving the driving motor, and the end of the strip S is positioned at the release position A of the mandrel 100 do. Here, the release position A of the mandrel 100 is a state in which the strip S wound on the mandrel 100 is not overlapped with each other, for example, the strip S is wound once around the outer peripheral surface of the mandrel 100 State.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an apparatus for measuring the length of a strip rear end according to the present invention will be described with reference to the accompanying drawings.

2 to 7, the apparatus for measuring the length of the strip rear end according to the present embodiment includes a mandrel 100, a driving motor 200, a speed sensor 300, a power source 400, a current sensor 500, (600), a pinch roll (700), and a control unit (800).

Referring to FIG. 2, the mandrel 100 is for coiling or uncoiling the strip S, which coils the strip S by rotating in one direction and rotates in the other direction And uncoils the strip wound on the outer circumferential surface of the mandrel 100. The strip S to be unwound from the mandrel 100 is moved to the sheath 600 via the pinch roll 700.

The drive motor 200 is connected to the mandrel 100 and provides a rotational driving force to the mandrel 100 to rotate the mandrel 100.

The speed sensor 300 is connected to the driving motor 200 and transmits to the controller 800 a measured speed at which the rotational speed of the driving motor 200 is measured.

Referring to FIG. 4, the power supply unit 400 is connected to the drive motor 200, and supplies power to the drive motor 200. Specifically, the power supply unit 400 supplies AC power to the converter 410, and the converter 410 connected to the power supply unit 400 converts the AC power into DC power and outputs the DC power to the inverter 420, Converts the DC power supplied from the converter 410 to a rated AC power for driving the drive motor 200, and supplies the rated AC power to the drive motor 200.

The current sensor 500 is electrically connected to the drive motor 200 and the power supply unit 400 and measures a load current that is a current flowing from the power supply unit 400 to the drive motor 200 and transmits the measured load current to the control unit 800.

5 and 6, the mandrel 100 includes a central shaft 110, a first segment 120, a second segment 130, a third segment 140, a case 150, a cylinder (not shown) 160, a drive pump 170, a plate 180, and a distance sensor 190.

The center shaft 110 is movable in the longitudinal direction of the center shaft 110 and a piston 112 is connected to one end of the center shaft 110. The piston 112 is connected to the inner space P In the longitudinal direction of the cylinder 160. As shown in Fig.

The first segment 120 is coupled to the center axis 110 and has a first inclined face 124, which is an inclined face formed in the longitudinal direction of the central axis 110, on the outer peripheral face. The first segment 120 may have a plurality of first slanting protrusions 122 protruding from the outer circumferential surface and the first slanting surface 124 may be formed at one end of the first slanting protrusion 122.

The second segment 130 is fixedly installed around the first segment 120 and is formed in the longitudinal direction of the central axis 110 and has the same inclination angle as the first inclined surface 124 of the first segment 120 Two inclined surfaces 134 are formed on the inner peripheral surface. The second segment 30 may have a plurality of second slanting protrusions 132 protruding from the inner circumferential surface and the second slanting surface 134 may be formed at one end of the second slanting protrusion 132.

The third segment 140 is coupled to the second segment 130 and is disposed around the second segment 130 and moves with the second segment 130. 6, when the central axis 110 moves in the direction of the piston 112, the first inclined projection 122 of the first segment 120 is inclined with respect to the second inclined plane 122 of the second segment 130, The outer diameter of the second segment 130 is laterally extended with respect to the central axis 110 and the outer diameter of the third segment 140 coupled to the second segment 130 The outer diameter is expanded at the same time. 5, when the central axis 110 moves in the direction opposite to the direction of the piston 112, the first slanting protrusion 122 of the first segment 120 is moved in the direction of the second segment 130 The outer diameter of the second segment 130 is reduced in the transverse direction relative to the central axis 110 and the third segment 140 coupled to the second segment 130 ) Is also reduced at the same time.

The case 150 is fixed to one side of the cylinder 160. The case 150 is provided with a distance sensor 190 for measuring the distance from the plate 180 to be described later.

The cylinder 160 is installed at one side of the case 150 and has one end opened and a moving hole 162 for adjusting the pressure of the internal space P of the cylinder 160 at the other side. A piston 112 is installed in the internal space P of the cylinder 160 and the piston 112 is movable in the longitudinal direction of the cylinder 160 by the pressure of the internal space P.

The driving pump 170 is connected to the moving hole 162 and the gas or the fluid is introduced into or discharged from the inner space P of the cylinder 160 through the moving hole 160, ). That is, the drive pump 170 controls the piston 112 to move the piston 112 in the longitudinal direction of the cylinder 160 by increasing or decreasing the pressure of the internal space P of the cylinder 160.

The plate 180 is fixed to the outer circumferential surface of the center shaft 110 and is disposed between the case 150 and the piston 112 and is movable along with the center shaft 110 in the longitudinal direction of the center shaft 110 Do.

The distance sensor 190 is installed in the case 150 and measures a distance between the plate 180 and the distance sensor 190. The distance sensor 190 may transmit the measured distance to the controller 900 to be described later.

Referring to FIG. 7, the sheath 600 is installed on one side of the mandrel 100 and cuts the strip S which is uncoiled from the mandrel 100. Specifically, the shear 600 cuts the strip S of a predetermined length of the length of the rear end of the strip S. For example, the rear end portion of the strip S may be cut more than 9 pieces at 0.6 [m].

The pinch roll 700 is provided between the mandrel 100 and the shear 600 and is configured to change the direction of the strip S so that the strip S uncoiled in the mandrel 100 advances to the shear 600 .

The control unit 800 calculates the length of the rear end of the strip S using the following equation 1 when the end of the strip S is located at the release position A of the mandrel 100. [ Here, the release position A of the mandrel 100 refers to the position where the strip S wound on the mandrel 100 is no longer overlapped with the end of the strip S to be tailed out. At this time, the strip S is once wound on the outer peripheral surface of the mandrel 100, and the wound length will be? * D.

 [Equation 1]

 L =? * D + L? 1 + L?

Where L is the length of the rear end of the strip S, D is the diameter of the mandrel 100, L1 is the distance from the release position A of the mandrel 100 to the pinch roll 700, Is the distance from roll 700 to sheer 600.

The control unit 800 determines that the end of the strip S is located at the release position A of the mandrel 100 when the difference between the measured velocity transmitted from the velocity sensor 300 and the predetermined velocity is equal to or greater than the reference value do. This is because the measurement speed 17 and the predetermined speed are kept constant in the state where the strip S is coiled on the mandrel 100 but the end of the strip S is positioned at the release position A of the mandrel 100 The measurement speed 17 is gradually decreased due to the speed control characteristic of the mandrel 100 from the point of time when it is positioned. 9, when the strip S is coiled on the mandrel 100, the predetermined speed is 60 [mpm] and the measured speed 17 is 60 [mpm] The predetermined speed is 60 [mpm] at the position where the end of the strip S is located at the release position A of the mandrel 100, but the measurement speed 17 is 30 [mpm] . Accordingly, the controller 800 determines that the end of the strip S is located at the release position A of the mandrel 100 when the difference between the predetermined speed and the measurement speed is 30 [mpm] or more.

When the difference between the load current transmitted from the current sensor 500 and the preset value is equal to or smaller than the reference value, the control unit 800 determines that the end of the strip S is located at the unlocked position A of the mandrel 100 do. This is because when the strip S is wound on the mandrel 100, the driving motor 200 is in a loaded state and when the end of the strip S is positioned at the unlocking position A of the mandrel 100, Is converted into a no-load state. When the drive motor 200 is in a no-load state, the load current becomes almost constant. 8, the load current of the drive motor 200 varies 10% to 100% depending on the material to be loaded, in the case where the drive motor 200 is in a load state. However, The load current of the drive motor 200 varies to about 7% because the drive motor 200 is in a no-load state.

When the distance from the plate 180 received from the distance sensor 190 is equal to or greater than a preset value, the control unit determines that the end of the strip S is located at the unlocking position A of the mandrel 100 . For example, as shown in FIG. 10, the distance measured by the distance sensor 190 when the coil (wound strip S) is drawn into the mandrel 100 and the third segment 140 is expanded is 766 mm, The distance measured by the distance sensor 190 expands by 10 mm at 776 mm when the end of the movable contact S comes to the unlocking position A of the mandrel 100.

This is because the third segment 140 is extended and fixed to the inner circumferential surface of the wound strip S after the strip S is drawn into the mandrel 100 and the strip S wound on the mandrel 100 is released Start. When the end of the strip S comes to the release position A, the expansion force acting on the inner circumferential surface of the strip S wound around the mandrel 100 is extended to the mechanical extension length by the inertia.

As a result, the present invention accurately detects the time when the end of the strip S is located at the release position of the mandrel, so that the length of the strip tail can be accurately measured.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

100: mandrel 110: center axis
112: piston P: inner space
120: first segment 122: first oblique projection
124: first inclined surface 130: second segment
132: second oblique projection 134: second oblique surface
140: third segment 150: case
160: cylinder 162: moving hole
170: drive pump 180: plate
190: Distance sensor 200: Drive motor
300: speed sensor 400:
500: Current sensor 600: Shear
700: pinch roll 800: control unit

Claims (9)

A mandrel for uncoiling a strip wound on the outer circumferential surface by rotation;
A sheath disposed on one side of the mandrel, the sheath cutting the uncoiled strip from the mandrel;
A pinch roll installed between the mandrel and the sheath for switching the direction of the strip such that the uncoiled strip advances into the sheath;
The length of the rear end of the strip is calculated when the end of the strip is located at the release position A of the mandrel where the strips wound on the mandrel do not overlap with each other, And a controller
The mandrel
A longitudinally movable central axis;
A third segment installed around the central axis and extending or contracting in a lateral direction with respect to the longitudinal direction of the central axis as the central axis moves;
A plate disposed on an outer circumferential surface of the center shaft and disposed at a predetermined position of the center shaft;
And a distance sensor installed at one side of the central axis for measuring and transmitting the distance to the plate,
Wherein the controller determines that the end of the strip is located at the release position (A) of the mandrel when the distance from the plate to the plate is greater than a predetermined distance. . The method according to claim 1,
The length measuring device at the rear end of the strip
A drive motor coupled to the mandrel and providing a rotational driving force to the mandrel for rotation;
And a speed sensor connected to the driving motor and transmitting a measuring speed at which the rotational speed of the driving motor is measured,
Wherein the controller determines that the end of the strip is located at the release position (A) of the mandrel when the difference between the measured speed and the predetermined speed transmitted from the speed sensor is greater than or equal to a reference value. Length measuring device. The method according to claim 1,
The length measuring device at the rear end of the strip
A drive motor coupled to the mandrel and providing rotational drive force to the mandrel for rotation;
A power supply connected to the driving motor and supplying power to the driving motor;
And a current sensor connected to the drive motor and the power supply unit for measuring a load current that is a current flowing from the power supply unit to the drive motor,
Wherein the control unit determines that the end of the strip is located at the release position (A) of the mandrel when the difference between the load current and the preset value transmitted from the current sensor is less than or equal to a reference value. Length measuring device. delete A mandrel for uncoiling a strip wound on the outer circumferential surface by rotation;
A sheath disposed on one side of the mandrel, the sheath cutting the uncoiled strip from the mandrel;
A pinch roll installed between the mandrel and the sheath for switching the direction of the strip such that the uncoiled strip advances into the sheath;
The length of the rear end of the strip is calculated when the end of the strip is located at the release position A of the mandrel where the strips wound on the mandrel do not overlap with each other, ;
A drive motor coupled to the mandrel and providing rotational drive force to the mandrel for rotation;
A power supply connected to the driving motor and supplying power to the driving motor;
A speed sensor connected to the drive motor for transmitting a measurement speed at which the rotation speed of the drive motor is measured;
And a current sensor connected to the drive motor and the power supply unit and measuring a load current that is a current flowing from the power supply unit to the drive motor,
The mandrel
A longitudinally movable central axis;
A third segment installed around the central axis and extending or contracting in a lateral direction with respect to the longitudinal direction of the central axis as the central axis moves;
A plate disposed on an outer circumferential surface of the center shaft and disposed at a predetermined position of the center shaft;
And a distance sensor installed at one side of the central axis for measuring and transmitting the distance to the plate,
Wherein the control unit determines that the difference between the measured speed and the preset speed transmitted from the speed sensor is equal to or greater than a first reference value and the difference between the load current transmitted from the current sensor and a predetermined value is equal to or less than a second reference value, Wherein the controller determines that the end of the strip is located at the release position (A) of the mandrel when the distance from the plate to the plate is greater than a predetermined distance. The method according to claim 1 or 5,
The mandrel
A first segment coupled to the periphery of the central axis, the first segment having a first inclined surface on an outer circumferential surface, the inclined surface being formed in the longitudinal direction of the central axis; And
And a second segment fixedly installed around the first segment and having a second inclined surface having an inclination equal to that of the first inclined surface on an inner circumferential surface thereof,
Wherein the third segment is coupled to the second segment and extends or contracts in the transverse direction with respect to the longitudinal direction of the central axis by moving the first inclined surface along the second inclined surface by movement of the central axis A length measuring device for measuring the length of the rear end of the strip. The method of claim 6,
Wherein the first segment has a plurality of first slant projections projecting from an outer circumferential surface of the first segment,
Wherein the second segment has a plurality of second slant projections projecting from an inner circumferential surface of the second segment,
Wherein the first inclined surface and the second inclined surface are formed at one ends of the first inclined projection and the second inclined projection, respectively. The method according to claim 1 or 5,
The length measuring device at the rear end of the strip
A cylinder which is opened at one end and has a moving hole for adjusting the pressure of the internal space;
A piston installed in an inner space of the cylinder and movable in the longitudinal direction of the cylinder due to the pressure of the inner space;
And a driving pump connected to the moving hole and adjusting a pressure of the inner space by introducing or discharging gas or fluid into the inner space through the moving hole. An uncoiling step in which the strip wound on the outer circumferential surface of the mandrel is uncoiled;
A measuring step of measuring a distance between a distance sensor provided at a predetermined position of the central axis of the mandrel and a plate provided at one side of the central axis; And
And a determination step of determining that the strip is located at the release position (A) of the mandrel where the end of the strip is not overlapped with the strip wound on the mandrel when the distance is equal to or greater than a predetermined value Way.

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