JPH0640628A - Loop detecting device - Google Patents

Abstract

PURPOSE:To provide a loop detector which is applicable to a slit machining line for a web, and can individually detect the looping state of all strap material hanging down into a pit. CONSTITUTION:A guide rail 13 is arranged above a pit 5 in a state where it crosses at a right angle to the travelling direction of a strap material 4, and a laser echo type loop detector 9 is attached to a travelling body 14 self- advancing along the guide rail 13. A drive controller 12 controls the operating state of driving mechanisms 11,11 for a winding reel 7 and a slitter 3 on a detection signal sent from the loop detector.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loop detection device for loop control in a slitting line for a metal, paper or plastic web.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 56-37935 discloses a prior art of a loop detecting device of this type. There, as shown in FIG. 5, a light emitter 32 and a light receiver 33 are arranged in a state orthogonal to the transfer direction of the strip 31 with a slit strip 31 hanging in the pit 30 interposed therebetween, and these detectors are arranged. By detecting the state of the optical path between them by the light receiver 33, it is determined whether or not the group of strips 31 is within the proper hanging range. The light receiver 33 is formed by arranging a large number of photosensitive elements arranged in a vertically long row, and detects the minimum loop amount of the group of strips 31 and the maximum of the group of strips 31 depending on the presence or absence of signal output of each photosensitive element. Loop amount is being detected.

[0003]

Such a conventional loop detecting apparatus detects a group of strips at a time, and detects that the loop amount of the group decreases below a minimum limit value. , Only detecting that the loop amount of the group increases beyond the maximum limit value. That is, when the height difference between the loop amounts of the group of strips becomes large, some strips cannot be detected.
For example, the strip material reaches the bottom wall of the pit and scratches the surface, or a state in which only a specific strip material has an excessive tension is applied.

If the maximum limit loop position and the minimum limit loop position are detected in parallel, the abnormality of the group of strips can be surely detected, but the photodetector in the form of detecting the interruption of the optical path. It is difficult to do this in. At least two photo detectors must be installed above and below the pit,
The cost increases accordingly. In addition, the light transmitter and light receiver in the pit must be installed with sufficient margin at a position far away from the traveling belt material, which requires the pit width to be widened and the pit construction cost is high. The maintenance of the light receiver is also troublesome.

An object of the present invention is to obtain a loop detecting device capable of accurately detecting individual loop states of the entire strip by improving the detection form of the loop portion.

[0006]

SUMMARY OF THE INVENTION The present invention is a loop detection device provided with a loop detector 9 for detecting the loop state of a group of slit strips 4 hanging in a pit 5. The non-contact distance measuring device is arranged so as to be oriented toward the loop portion 4a of the strip 4, so that the detection medium of the loop detector 9 can be reciprocally displaced while intersecting the traveling direction of the group of strips 4, The loop detector 9 is the scanning mechanism 1
It is required to support 0.

Specifically, the scanning mechanism 10 comprises a group of strips 4
The guide rail 13 is arranged in a state substantially orthogonal to the traveling direction, and the traveling body 14 that transfers the loop detector 9 along the guide rail 13. Further, the scanning mechanism 10 includes a support base 19 provided at a position facing the loop portion 4a of the strip 4 and an operation tool 20 mounted on the support base 19 to reciprocally rotate the loop detector 9. There is.

[0008]

The loop detector 9 is reciprocally moved or reciprocally rotated by the scanning mechanism 10 so that the projected detection medium is applied to each strip 4
While traversing, the vertical position of the loop portion 4a is detected as a quantity. Therefore, in the state where all the strips 4 are crossed,
The loop amount of all the strips 4 will be detected individually.
When the drive control device 12 controls the operating states of the drive mechanisms 11 and 11 'of the take-up reel 7 and the slitter 3 based on the detection results and the comparison results obtained as described above, the group of strips 4 moves up and down. It is possible to prevent exceeding the limit position and falling into an abnormal loop state. Furthermore, it is possible to predict the loop state in advance from the change tendency of the loop amount and take a countermeasure corresponding to the prediction result.

[0009]

According to the present invention, the loop detector 9 is operated by the scanning mechanism 10 to detect the individual loop states of all the strips 4 as substantial amounts. The suitability of the loop state of each strip 4 can be detected, and further by continuously comparing the detection results, the change tendency of each strip 4 and the change tendency of the whole can be clearly known. Therefore, by performing drive control of the drive mechanisms 11 and 11 'based on the above detection results and comparison results, it is possible to eliminate the abnormal loop state of one group of the strips 4 and to perform slit processing of the web 2. It can be done efficiently without interruption. Further, since the loop state of each strip 4 can be predicted in advance from the change tendency of the loop amount, even if there is a large difference in the loop amount of the group of strips 4 by performing a restoration process based on this prediction result. By winding each strip 4 in an appropriate state, it is possible to eliminate the occurrence of defects due to an abnormal loop state during slit processing, winding defects, and the like.

[0010]

1 to 4 show an embodiment in which the loop detecting device according to the present invention is applied to a slit processing line for rolled steel sheets. In FIG. 1, the wide web 2 continuously fed from the rewinding device 1 is divided into strips 4 having a predetermined width by the slitter 3, and then the winding device 6 is passed through the pits 5.
To be wound up. In general, the web 2 is extremely slight during rolling, but becomes thinner as it gets closer to both sides with the maximum thickness in the width center portion. Therefore, although the take-up reels 7 provided corresponding to the respective strips 4 are driven at the same rotation speed, a difference occurs in their peripheral speeds, and a difference in the winding amount occurs between the individual strips 4. To do. A pit 5 is provided to absorb this difference in the winding amount, and a loop control device is provided.

The loop control device includes a loop detection device A for detecting the loop state of the strip 4 hanging in the pit 5,
The winding mechanism 6 comprises a drive mechanism 11, a drive mechanism 11 'for the slitter 3, and a drive control device 12 for controlling the operating states of the drive mechanisms 11 and 11' based on the detection signal from the loop detector 9. . The take-up reel 7 is rotationally driven by the drive mechanism 11.

The loop detection device A includes a loop detector 9
And a scanning mechanism 10 for moving the same. Of these, the loop detector 9 is a commercially available laser echo type distance measuring device, and projects a laser beam (detection medium) from the light projecting window toward the bottom of the loop portion 4a of the band 4. The laser beam reflected by the loop section 4a is detected by the light receiving section in the light projecting window, and the arrival time difference at the light receiving section between the reference beam and the reflected laser beam emitted at the same time from the laser beam to the bottom of the loop section 4a. The distance of is detected as a substantial amount.

The scanning mechanism 10 includes a guide rail 13 arranged above the pit 5 in a state orthogonal to the traveling direction of the group of strips 4, and a traveling body 1 which is self-propelled along the guide rail 13.
4 and a column 15 that supports the guide rail 13, and the loop detector 9 is mounted on the traveling body 14. As shown in FIG. 2, the traveling body 14 can travel back and forth in the left-right direction across the entire opening width of the pit 5, whereby the loop detector 9
Is a loop portion 4a of a group of strips 4 that hang down into the pit 5.
The vertical position of the loop portion 4a can be detected by passing right above the bottom of the loop portion 4a. When the laser beam cannot be projected on the bottom of the loop portion 4a due to the equipment, the laser beam is projected on the proper place of the loop portion 4a which is off the bottom of the loop portion 4a.
Alternatively, the loop amount may be calculated by a calculator using the weight, span, tension, and the like as factors.

The drive control device 12 recognizes the vertical position of the loop portion 4a of each strip 4 from the traveling signal of the traveling body 14 and the output signal of the loop detector 9, and determines whether or not the entire loop state is appropriate and whether each loop state is proper. Whether or not the portion 4a is within the upper and lower limit positions is determined and displayed. In addition, the detection results for several times are stored, and these are compared with the latest detection results, and the individual strips 4
Recognize the changing tendency of the loop state and the changing tendency of the whole. Based on this recognition and the determination, the drive mechanism 11
11 'is controlled to be accelerated or decelerated, or the driving torque is changed to a large or small value. Further, the drive control device 12 predicts in advance that the loop portion 4a exceeds the upper and lower limit positions and falls into an abnormal loop state from the change tendency of the loop state, and is provided in the vicinity of the corresponding take-up reel 7 or slitter 3. Blink the indicator. Alternatively, in the case of the winding device 6 capable of individually controlling the driving state of the winding reel 7, the corresponding winding reel 7 is accelerated or decelerated so that the strip 4 can be wound in an appropriate winding state. .

The total length of the web 2 is 500 to 5000.
m, the feed rate is 30 to 300 m / min, and as described above, the loop depth due to the difference in the thickness of the web 2 in the width direction, that is, the distance from the running surface of the strip 4 to the bottom of the loop portion 4a is Reach 5-8 m depending on web length. In order to absorb this, the depth of the pit 5 is set to 2 to 12 m. Further, in order to cope with an unexpected abnormal loop state, dancer rollers 17 are provided corresponding to the strips 4 at both ends where the loop depth becomes particularly large, so that the strips 4 can be lifted. Reference numeral 18 is a guide roller provided above the opening edge of the pit 5.

The loop detection device A having the above-mentioned configuration
Monitors the loop state of each strip 4 while reciprocating the loop detector 9 along the guide rail 13. Therefore, an abnormality in the loop state can be individually detected for all the strips 4, and it is possible to predict in advance that the strip 4 will fall into an abnormal loop state and take a recovery measure. For example, in the situation where the loop depth at both ends in the width direction approaches the limit value,
A sheet material for increasing the thickness can be wound together with the strip material 4 to increase the coil peripheral speed and reduce the loop depth.

FIG. 3 shows another embodiment in which the scanning mechanism 10 is changed. This is a specification in which the guide rail 13 and the traveling body 14 are arranged at the bottom of the pit 5, and the loop detector 9 that reciprocates along with the traveling body 14 detects the loop portion 4a of each strip 4 from the lower surface side. Has become. Furthermore, as another embodiment, the guide rail 13 may be arranged in a corner of the bottom wall in a state of being inclined.

FIG. 4 shows another embodiment in which the scanning mechanism 10 is further modified. The scanning mechanism 10 is composed of a gate-shaped support base 19 straddling the upper part of the pit 5 and an operation tool 20 provided in the center of the support base 19, and the loop detector 9 attached to the operation tool 20 serves as a shaft 21. The upper and lower positions of the loop portion 4a of each strip 4 are detected by reciprocally rotating around. Although details of the operation tool 20 are not shown, a mechanism equivalent to the swinging mechanism of the fan can be applied.

In addition to the above, the loop detector 9 may be a rangefinder other than the embodiment as long as it is a non-contact type rangefinder, and for example, an ultrasonic echo type rangefinder using ultrasonic waves as a detection medium is applied. it can. The loop detector 9 may be directly moved by a rodless cylinder.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of the overall principle.

FIG. 2 is a vertical sectional front view showing a relationship between a scanning mechanism and pits.

FIG. 3 is a vertical sectional front view showing another embodiment of the present invention in which the scanning mechanism is changed.

FIG. 4 is a vertical sectional front view showing still another embodiment of the present invention in which the scanning mechanism is changed.

FIG. 5 is an explanatory diagram showing a conventional loop detection device.

[Explanation of symbols]

 2 web 3 slitter 4 strip material 4a loop part 5 pit 7 take-up reel 9 loop detector 10 scanning mechanism 11 drive mechanism 12 drive control device 13 guide rail 14 traveling body

Claims (3)

[Claims] 1. A loop detector comprising a loop detector 9 for detecting a loop state of a group of slit strips 4 hanging in a pit 5, wherein the loop detector 9 is directed toward a loop portion 4a of the strip 4. The scanning mechanism 10 includes a loop detector 9 so that the loop detector 9 can be reciprocally displaced while the detection medium of the loop detector 9 intersects with the traveling direction of the group of strips 4. A loop detection device which is supported. 2. A guide rail 13 in which the scanning mechanism 10 is arranged in a state of being substantially orthogonal to the traveling direction of the group of strips 4.
The loop detection device according to claim 1, further comprising: a traveling body 14 that transports the loop detector 9 along the guide rail 13. 3. The scanning mechanism 10 comprises a loop portion 4a of the strip material 4.
Support table 19 provided at a position facing the
The loop detection device according to claim 1, further comprising an operation tool 20 mounted on the operation device for rotating the loop detector 9 in a reciprocating manner.