JP2000334513A - Method for controlling loop of metallic strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically execute the loop control of a metallic strip, especially, tail-end management. SOLUTION: A cutting equipment 10 for cutting the metallic strip 11 into a certain shape while continuously threading the strip is provided with a side trimmer 14 and shear 15. An inlet-side loop 27 and outlet-side loop 28 are respectively formed on the inlet and outlet sides of the side trimmer 14. A loop 29 for stopping and cutting is formed on the inlet side of the shear 15. As for each loop, loop control is executed by detecting the amount of sag with ultrasonic sensors 21, 22, 23 when the strip is usually threaded and the threading of the metallic strip 11 is executed in the state where the strip can be largely sagged in pits 24, 25, 26. When the residual amount of the metallic strip 11 which is wound around a coil 12 is reduced, the control is changed to upper limit loop control using the ultrasonic sensors 21, 22, 23, an inlet-side loop table 31, outlet-side loop table 32 and loop table 33 for stopping and cutting are elevated and reduce the amount of bend of the metallic strip 11 at the time of passing through the bottom.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of controlling a loop of a metal strip for controlling the amount of droop of a loop provided partially in a threading path when processing is performed by continuously passing a metal strip.

[0002]

2. Description of the Related Art When performing various processes, such as cutting, while continuously passing a metal band, a loop for partially hanging the metal band is provided. For example, in a side trimmer that adjusts the width while cutting the metal strip continuously in the plate direction, if the tension of the metal strip increases, the cutting blade may be chipped. It must be provided so that tension is not applied. Further, in a shearing device such as a shear for cutting a metal strip by a predetermined length to obtain a fixed length material, it is necessary to temporarily stop the passing of the metal strip at the time of shearing. Even when it is necessary to stop the passing of the metal strip or to change the passing speed, the passing speed of the entire device is kept constant, and partial fluctuations are handled by increasing or decreasing the amount of droop in the loop. . In order to perform such an adjustment in a larger range, a looper device or the like may be provided. The looper device welds, for example, the end of one coil of the metal strip to the beginning of the coil of the next metal strip,
It is provided in a case where the metal strip is continuously passed as a whole. In equipment that processes a metal strip in units of coils, simple speed adjustment is performed by forming a loop without providing a looper device.

FIG. 9 shows a loop 2 in the middle of a metal strip 1 passing plate.
Is shown, and a schematic configuration for controlling the amount of droop is shown. The loop 2 is formed as a pit 3 in a recess formed by excavating the floor 4 downward. The lower end of the loop 2 is formed between the bottom surface 5 of the pit 3 and the floor surface 4. The amount of droop of the loop 2 is detected by detecting the light emitted from the projectors 6a and 6b installed in the pit 3 by the light receivers 7a, 7b and 7
Light receivers 7a to 7c that receive light at c, 7d, and 7e and receive light
According to the position of e, the amount of loop can be obtained by capturing the light-shielded state due to the amount of droop of the loop 2.

At the time of normal sheet passing, the loop table 8 is lowered to perform optical loop control in the pit 3.
The amount of droop of the loop 2 is detected by detecting the light-shielded state of the loop 2 based on the amount of light emitted from the projectors 6a and 6b provided on the side surfaces of the pit 3 and received by the light receivers 7a to 7e. Is controlled.

[0005]

When the metal strip 1 is passed through the loop 2 as shown in FIG. 9, the coils of the metal strip are not welded to each other. When passing, it is necessary to reduce the amount of droop. The bottom portion of the coil cannot be supported on both the upstream side and the downstream side of the pit 3, and the downstream side falls into the pit 3. At the time of such coil bottom removal, the metal strip 1 may hang down along the wall surface at a steep angle, and may be bent or deformed. For this reason, when passing through the bottom portion, the amount of hanging of the loop 2 is reduced, and the loop table 8 is raised from the bottom surface 5 of the pit 3 so that the amount of drop of the metal strip 1 is reduced.

However, it is checked whether or not the metal strip 1 is pulled out from the coil and the bottom portion is approaching. Also, in the range from the floor level (FL) to the pass line (PL), the optical band is used for optical detection from interference by the coil. Since it is difficult to install the light emitter and the light receiver, the process of passing the bottom portion of the coil by lowering the amount of droop of the loop 2 to approach the pass line (PL) and raising the loop table 8 is performed manually. Doing so is an obstacle to automation.

If the loop table 8 is not lifted when performing a stop cut by a shearing device or the like, the amount of droop of the loop at the bottom portion becomes large, and there is a possibility that bending deformation may occur. In addition, when a thick plate is cut by a shearing device, since the thick plate has a large weight, the amount of drop from the side wall of the pit increases, and quality abnormalities due to breakage tend to occur.

It is an object of the present invention to provide a metal band loop control method that can easily perform automatic control so that the amount of metal band droop in a loop falls within an appropriate range.

[0009]

SUMMARY OF THE INVENTION The present invention is an equipment for processing a metal strip while continuously passing the metal strip, wherein a pit is provided in a passing path of the metal strip to partially pass the metal strip through a pass line. In the loop control method of the metal band which controls the amount of droop of the loop, a distance sensor capable of detecting the distance to the surface of the metal band in a non-contact manner is provided at the position of the pit on the passing plate route. And controlling the supply speed of the metal band so that the detected amount falls within a predetermined range while detecting the amount of droop of the metal band by the distance sensor. Is the way.

[0010] According to the present invention, in a facility for performing processing by continuous passing of a metal strip, a pit is provided in a passing path, and a loop is formed by partially hanging the metal strip from a pass line. The amount of droop in the loop of the metal strip is detected by a non-contact type distance sensor arranged corresponding to the position of the pit. Since the supply speed of the metal strip is controlled so that the detection value of the amount of droop of the metal band falls within a predetermined range, the supply speed is reduced if the amount of droop is large, and the supply speed is increased if the amount of droop is small. Thus, automatic control can be easily performed so that the supply speed becomes appropriate. Since the amount of droop of the metal strip is detected as the distance from the top of the pass line to the surface of the metal strip by the distance sensor, there is no need to increase the mounting space, and there is no interference due to mounting, so the coil loop from the pass line to the lower limit of the pit The state can be measured, and the droop amount can be accurately detected over a wide range of the droop amount.

Further, in the present invention, a loop table capable of ascending and descending displacement is installed in the pit, the distance sensor is an ultrasonic distance sensor, and the control by detecting the amount of drooping is performed by controlling a coil of a metal band. In a predetermined tail end range, the loop table is raised to a preset position, and for a metal strip excluding the tail end range, the loop control is performed based on the droop amount detection while the loop table is lowered. Is performed.

According to the present invention, a loop table capable of ascending and descending is installed in the pit, and a loop control is performed by detecting a droop amount of the ultrasonic distance sensor with respect to a predetermined tail end range of the metal band coil. Accordingly, it is possible to automate the process of hanging the loop control amount and raising the loop table to a preset position, and passing the bottom portion of the coil. For the metal strip excluding the tail end range, the loop table is lowered and the loop control based on the detection of the droop amount in a wide range is performed, so that it is possible to perform quick threading and efficient loop control. it can. Since the detection of the amount of droop of the loop is performed by an ultrasonic distance sensor from above, it is impossible with a combination of a projector and a receiver installed on the side of the pit,
Detection when the loop amount is small can also be easily and accurately performed.

Further, in the present invention, the pits are provided on an entrance side and an exit side of a side streamer for cutting the metal band in the direction of the plate to adjust the width.

According to the invention, pits are provided on the entrance and exit sides of the side streamer for cutting the metal band in the direction of the plate and adjusting the width, and the ultrasonic distance sensor detects the amount of droop of the metal band. Based on the above, the loop control is performed so that the loop amount is within a certain range, so that a metal band loop is formed on the entrance side and the exit side of the side streamer, and the predetermined tail end of the coil of the metal band is determined. By loop control based on the droop amount detection by an ultrasonic distance sensor or the like for the range, the droop amount of the loop and the loop table are raised to a preset position, and the processing of passing the side streamer of the bottom portion of the coil, It can be automated, and no tension is applied to the side streamer, so that the cutting of the side streamer can be stably continued.

Further, in the present invention, the pit is provided at an entrance side of a shearing device for cutting the metal band by temporarily stopping the passage of the metal band.

According to the present invention, even if stop cutting for cutting and stopping the metal band temporarily by the shearing device is repeated, a change in the threading speed is absorbed by the loop provided on the input side of the shearing device, and Loop control based on the detection of the amount of droop by an ultrasonic distance sensor or the like with respect to the predetermined tail end range of the coil of the band, the amount of droop of the loop and the loop table are raised to a preset position, and the bottom portion of the coil Can be automated to prevent the pit from dropping, and a continuous threading can be maintained as a whole equipment.

[0017]

FIG. 1 shows a schematic configuration of a cutting equipment 10 for performing loop control according to an embodiment of the present invention. FIG. 2 shows a plan arrangement of the cutting equipment 10 of FIG. The cutting equipment 10 is used to cut a metal strip 11 such as a stainless steel strip into a certain width and length to obtain a fixed length material. The metal strip 11 is a payoff reel as the coil 12 (abbreviated as “Po / R” in the drawing).
13, pulled out, adjusted in the width direction by the side trimmer 14, and cut in the length direction by the shear 15. In the threading path of the metal strip 11, an input pinch roll (abbreviated as "P / R" in the drawing) 16 provided on the upstream side of the side streamer 14, and an output pinch roll 17 provided on the downstream side, An entry leveler 18 provided upstream of the side pinch roll 16 and an exit leveler 19 provided upstream of the exit pinch roll 17 are arranged and controlled by the control device 20. Ultrasonic sensors 21 and 22 are disposed above the pass line (hereinafter, may be abbreviated as “PL”) of the metal strip 11 on the entrance side and the exit side of the side streamer 14, respectively. An ultrasonic sensor 23 is disposed above a pass line of the metal band 11 between the output pinch roll 17 and the shear 15. Below the ultrasonic sensors 21, 22, 23, pits 24, 25, 2
6 are formed, and the metal band 11 is hung down to form the entrance loop 27, the exit loop 28, and the stop cut loop 29, respectively. During normal threading, the amount of droop may be adjusted by optical control as shown in FIG. 9 for the entrance side loop 27, the exit side loop 28, and the stop cut loop 29.

The entry pit 24 and the entry pinch roll 16
Between them, the entrance shear 30 is arranged, and when the coil 12 is divided, the metal strip 11 is cut. The cutting of the metal band 11 is performed in order to rewind the remaining metal band 11 to the payoff reel 13 side when the length required for the fixed length material cut by the shear 15 corresponds to the length in the middle of the coil 12. Do.

When the metal strip 11 is cut by the entrance shear 30 or when the front part of the metal strip 11 of the coil 12 is pulled out, the bottom portion, which is the tail end of the metal strip 11, is passed along the pass line. Will be. Especially pit 2
In the areas of 4, 25 and 26, during normal passing, the center part is suspended by supporting on both sides of the entry side and the exit side, but when the bottom part passes, support only on the exit side And the bottom portion may hang down from the side wall surface on the exit side of the pits 24, 25, 26 at a sharp angle, and bend or break. Therefore, each pit 24, 25, 2
6 are provided on the bottom surface of the entrance side loop table 31, the exit side loop table 32 and the stop cut loop table 33.
Is provided, and when the bottom portion passes, it is raised to limit the amount of droop of the bottom portion of the metal strip 11.

In order to control each part of the cutting equipment 10 in accordance with the passage of the bottom of the metal strip 11, the entrance of the entrance leveler 19, the exit of the entrance loop 27, the entrance of the side streamer 14, and the exit of the side streamer 14. Entry level of exit leveler 19, exit leveler 19
A bottom detector 34, 35, 36, 37, 38 is provided between the output pinch roll 17 and the output pinch roll 17, and optically detects the passage of the bottom portion of the metal strip 11. In order to confirm whether or not the metal strip 11 is pulled out from the coil 12 and approaches the bottom portion, the ITV camera 3 is used.
9 is provided to capture an image of the payoff reel 13.
The metal band 11 is supplied to the shear 15 via a pinch roll 40.
Is supplied.

FIG. 3 shows a range of loop control in each of the pits 24, 25, and 26. The pass line (P
L), the control is performed so as to hang down to near the bottom line (GL) as shown by the imaginary line during normal passing.
When the bottom portion passes, the loop table (not shown) is raised, and the range up to the floor level (FL) is set as a range in which the hanging portion of the loop of the metal strip 11 does not touch the surface of the loop table. Perform upper limit loop control as a loop. As the ultrasonic sensors 21, 22, and 23, for example, an ultrasonic distance sensor commercially available as UD-300 series from Keyence Corporation can be used.
This ultrasonic distance sensor can set a minimum value and a maximum value as a distance measurement target within a measurement range, and can extract a maximum value from the minimum value as an analog current output of 4 to 20 mA.

FIGS. 4 and 5 show the ultrasonic sensor 2 of FIG.
The relationship between the output current from the ultrasonic sensors 21 and 22 and the control voltage of the supply speed of the metal strip 11 when controlling the input side loop 27 and the output side loop 28 by 1 and 22 is shown. The supply speed of the entry-side loop 27 is controlled by controlling the speed of the entry-side pinch roll 16. The supply speed of the exit loop 28 is controlled by controlling the speed of the side streamer 14.

FIG. 6 shows an overall control procedure when a fixed length material is cut out from the metal strip 11 using the cutting equipment 10 shown in FIG. Processing of the metal strip 11 is started from step a1. In step a2, it is determined whether or not the remaining winding amount of the coil 12, that is, the length of the metal strip 11 estimated to remain in the coil 12 is equal to or less than a predetermined value L. to decide. The predetermined value L is
For example, it is 25 m. The length of the metal strip 11 remaining in the coil 12 is determined by the pay-off reel 13 of the cutting equipment 10.
It is measured in the process of manufacturing the coil 12 to be mounted on the device. It can be calculated by subtracting the length from which the metal strip 11 is drawn out from the total length of the coil 12. However, since it is expected that there is a measurement error or a measurement error, the reference length L is set as a length that allows for a margin. Further, even when the remaining winding length of the coil is longer than L, for example, when the remaining winding length becomes 60 m, a warning is issued to the operator in charge of the operation of the cutting processing equipment 10 by voice, and Is I
The video of the payoff reel 13 is monitored by the TV camera 39,
It can also be checked whether the metal strip 11 is actually near the end.

If it is detected in step a2 that the bottom portion of the coil 12 is approaching, in step a3, the passing speed of the metal strip 11 is reduced. Step a4
Then, using the ultrasonic sensor 22, the loop control in the output side loop 28 that hangs down near the bottom line (GL) as shown in FIG. 3 is changed to the upper limit loop control. Step a
In step 5, the side streamer speed is reduced to reduce the amount of droop of the metal strip 11 in order to perform the upper limit loop control.
In step a6, as a result of the side streamer speed deceleration,
It waits until the amount of droop of the metal strip 11 in the exit loop 28 rises to the upper limit loop control position. Next, in step a7, the upper limit loop control in the output side loop 28 is started.

Next, in step a8, the ultrasonic sensor 21 is used to change the loop control of the entry side loop 27 drooping to near the bottom line (GL) as shown in FIG. 3 to the upper limit loop control. In step a9, the speed of the entry pinch roll 16 is reduced in order to reduce the amount of hanging of the metal strip 11. At step a10, the control waits until the amount of droop of the entry loop 27 reaches the upper limit loop control position. Step a
At 11, the upper limit loop control in the entry loop 27 is started, and preparation for the bottom portion of the coil 12 to pass through the entry loop 27 and the exit loop 28 is completed at step a12.

FIG. 7 shows a procedure for passing the bottom portion of the coil 12 of the metal strip 11 through the cutting equipment 10 which has been prepared for passing the bottom portion in the procedure shown in FIG. When the bottom portion of the coil 12 of the metal strip 11 is reached in step b1, the bottom detector 34 of FIG. In step b3, the entrance leveler 18 lowers the metal strip 11,
The entrance leveler 18 secures the tension previously secured by the payoff reel 13. Next, in step b4, the upper limit loop control of the entrance loop 27 is stopped, and step b5
To raise the entry-side loop table 31 to the pass line position. In step b6, the bottom detector 35 shown in FIG. 1 detects bottom bottom detachment in which the coil bottom portion passes through the entry pinch roll 16. Thereby, it is confirmed that the coil bottom has passed through the entrance side leveler 18,
In step b7, the pressure of the entrance-side leveler 18 is stopped to release. Next, in step b8, the outlet loop table 32 is raised to a position where the bottom surface of the outlet loop 28 under the upper limit loop control is not touched.

In step b9, the bottom of the coil at the entry side of the side streamer 14 is detected by the bottom detector 36 shown in FIG. In step b10, the upper limit loop control in the output side loop 28 is stopped. Step b
At 11, the exit side loop table 32 is raised to the pass line position. In step b12, the passing speed of the metal strip 11 is increased, and the bottom portion of the metal strip 11 comes out of the side streamer 14 and passes on the output side loop table 32. In step b13, the bottom detector 37 detects the missing bottom of the coil bottom on the entrance side of the exit leveler. In step b14, the exit leveler 19 is opened, and in step b15, the bottom detector 38 is turned on by the exit leveler 1.
If the bottom of the coil bottom is detected with respect to No. 9, the entry side line is stopped in step b16, and the procedure of passing the coil bottom is ended in step b17.

FIG. 8 shows the stop cut loop 2 of FIG.
9 shows a configuration related to the embodiment. Stop cut is shear 1
5, a metal strip 11 continuously wound as a coil 12
Is sheared into a plate of the order length, for example. For example, a case of shearing to a length of 2 m will be described.

When the metal strip 11 corresponding to the entire length of the line of the cutting equipment 10 is pulled out from the coil 12 and is continuously transported, the metal strip 11 is sent out from the position of the shear 15 to a length of 2 m from the position of the shear 15 by the pinch roll 40. Then, the feeding by the pinch roll 40 is stopped until the shearing by the shear 15 is completed. While the conveyance of the metal band 11 is stopped by the pinch roll 40, the metal band 11 is accumulated in a direction in which the amount of droop of the stop cut loop 29 increases, and the metal band 11 on the upstream side of the stop cut loop 29 is accumulated. Is continued. When the shearing by the shear 15 is completed, the metal band 11 accumulated as the stop cutting loop 29 is simultaneously sent out by the pinch roll 40, and the following operations are repeated. At this time, if the threading speed of the metal strip 11 fed by the pinch roll 40 is set to be higher than the threading speed of the entire cutting equipment 10, the amount of droop of the stop-cut loop 29 when the pinch roll 40 passes is reduced. The operation which decreases and increases when stopped is repeated. In accordance with the amount of droop detected by the ultrasonic sensor 23. The feeding speed of the pinch roll 40 is adjusted, and loop control is performed so that the stop cut loop 29 is formed within an appropriate range.

When the bottom portion of the metal strip 11 passes through the stop cut loop 29, the passing speed is reduced, so that the upper limit loop control similar to the entry loop 27 and the exit loop 28 is performed. The stop-cut loop table 33 is raised to prevent a drop when passing through the bottom.

The amount of loop droop of the metal strip 11 can be detected optically in a non-contact manner using a laser or the like instead of the ultrasonic sensors 21, 22, 23. Also,
Optical detection and ultrasonic detection can be combined. As the metal band 11, not only stainless steel but also many types such as ferrous and non-ferrous can be applied. In addition, not only cutting, but also surface treatment and drilling can be performed.

[0032]

As described above, according to the present invention, since the distance sensor automatically controls the supply speed so that the amount of droop of the metal band in the loop is within a predetermined range, it is possible to easily set an appropriate droop. A quantity of loops can be formed to process the metal strip.

Further, according to the present invention, a loop table is provided in the pit, and when a predetermined tail end range of the coil of the metal band is passed through, the loop table is raised to a preset position. . Even if the loop table is raised, if the path of the ultrasonic wave generated from the ultrasonic sensor and reflected on the surface of the metal band is secured, the droop amount of the metal band is accurately detected, and the tail end range passes smoothly. Can be adjusted to

Further, according to the present invention, when the width of the metal strip is adjusted by the side streamer, an appropriate loop can be formed on the entrance side and the exit side so that tension is not applied.

According to the invention, when the metal strip is temporarily stopped by the shearing device to cut the metal strip, a loop is formed on the entrance side to absorb the influence of the stop of the metal strip. Can be done.

[Brief description of the drawings]

FIG. 1 is a simplified side view showing a schematic configuration of a cutting equipment 10 that performs loop control according to an embodiment of the present invention.

FIG. 2 is a simplified plan view showing an arrangement state of each element of the cutting processing equipment 10 of FIG.

FIG. 3 is a simplified cross-sectional view showing a configuration related to loop control by the ultrasonic sensors 21, 22, and 23 of FIG.

FIG. 4 is a graph showing a relationship between a detection amount of the ultrasonic sensor 21 and a control amount of the entry pinch roll 16 in the upper limit loop control performed in the entry loop 27 of FIG.

FIG. 5 is a graph showing the relationship between the detection amount of the ultrasonic sensor 22 and the speed control of the side streamer 14 during the upper limit loop control in the exit loop 28 of FIG.

FIG. 6 is a flowchart showing a procedure for changing a loop control method in preparation for the passage of a bottom portion in the cutting processing equipment 10 of FIG. 1;

FIG. 7 is a flowchart showing a control procedure when the cutting processing equipment 10 of FIG. 1 passes a bottom portion.

8 is a simplified side cross-sectional view showing a configuration for controlling a stop cut loop 29 in the cutting equipment 10 of FIG.

FIG. 9 is a simplified cross-sectional view showing a configuration for conventional optical loop control.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cutting processing equipment 11 Metal strip 12 Coil 13 Payoff reel 14 Side trimmer 15 Shear 16 Inlet pinch roll 17 Outlet pinch roll 18 Inlet leveler 19 Outlet leveler 20 Control device 21, 22, 23 Ultrasonic sensor 24, 25, 26 Pit 27 Incoming loop 28 Outgoing loop 29 Stop cut loop 31 Incoming loop table 32 Outgoing loop table 33 Stop cut loop table 40 Pinch roll

Claims (4)

[Claims] 1. A facility for processing a metal strip while continuously passing the metal strip, wherein a pit is provided in a passing path of the metal strip, and a loop is formed by partially hanging the metal strip from a pass line. A method of controlling a loop of a metal strip for controlling a hanging amount of a loop, wherein a distance sensor capable of detecting a distance to a surface of the metal strip in a non-contact manner is disposed above a position of a pit of a passing plate path; While detecting the amount of droop of the metal band with a sensor,
A method for controlling a loop of a metal band, comprising controlling a supply speed of the metal band such that the detected amount falls within a predetermined range. 2. A loop table capable of ascending and descending is installed in the pit, the distance sensor is an ultrasonic distance sensor, and the control by detecting the amount of drooping is performed by a predetermined tail of a coil of a metal strip. In the end range, the loop table is raised to a preset position, and the loop control based on the droop amount detection is performed on the metal band excluding the tail end range with the loop table lowered. 2. The method for controlling a loop of a metal strip according to claim 1, wherein: 3. The loop control of a metal strip according to claim 1, wherein the pits are provided on an entrance side and an exit side of a side trimmer for adjusting a width by cutting the metal strip in a plate passing direction. Method. 4. The pit according to claim 1, wherein the pit is provided on an entrance side of a shearing device that cuts the metal band by temporarily stopping a metal band passing plate. Loop control method for metal strip.