JP2639610B2 - Loop detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loop detecting device for controlling a loop in a slit processing line of a metal, paper or plastic web.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 56-37935 discloses a conventional loop detecting apparatus of this type. In this case, as shown in FIG. 5, a light emitter 32 and a light receiver 33 are arranged in a state orthogonal to the transport direction of the band material 31 with the band material 31 after the slit hanging down into the pit 30 interposed therebetween. 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 an appropriate hanging range. The light receiver 33 is formed by arranging a large number of photosensitive elements in a vertically long row, and detects the minimum loop amount of the group of strips 31 according to the presence or absence of signal output of each photosensitive element, and detects the maximum amount of the group of strips 31. The loop amount is being detected.

[0003]

Such a conventional loop detecting apparatus detects a group of strips at once, and detects that the loop amount of the group decreases beyond a minimum limit value. , Either detecting that the amount of loops in the group increases beyond the maximum limit. That is, when the difference between the loop amounts of a group of strips becomes large, strips that cannot be detected occur.
For example, the band material has reached the bottom wall of the pit, causing abrasion on the surface, or a state in which only a specific band material is subjected to excessive tension.

If the detection of the maximum limit loop position and the minimum limit loop position is performed in parallel, the abnormality of the group of strips can be surely known. It is difficult to do this. Photodetectors must be provided at least two places above and below the pit,
The cost increases accordingly. In addition, the transmitter and receiver in the pit must be installed at a sufficient distance from the moving strip, so that the pit width must be increased, and the pit construction cost increases. Maintenance of the receiver is also troublesome.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a loop detecting device capable of accurately detecting an individual loop state of an entire band by improving a detection form of a loop portion.

[0006]

According to the present invention, there is provided a loop detecting apparatus provided with a loop detector for detecting a loop state of a group of slit strips hanging in a pit. A non-contact type distance measuring device arranged at the bottom of the loop portion 4a of the material 4; and a reciprocating displacement in a state where the detection medium of the loop detector 9 intersects the traveling direction of the group of the band materials 4. In order to be able to do so, it is required that the loop detector 9 is supported by the scanning mechanism 10 above or below the loop portion 4a of the strip 4.

More specifically, the scanning mechanism 10 includes a group of strips 4.
And a traveling body 14 that transports 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 operating tool 20 mounted on the support base 19 and reciprocatingly rotating the loop detector 9. I have.

[0008]

The detection medium from the loop detector 9 is applied to each band 4
The light is projected from above or below the loop portion 4a. Therefore,
The loop detector 9 is reciprocally moved or reciprocated by the scanning mechanism 10 so that the projected detection medium causes each of the strips 4 to move .
While crossing in a state perpendicular to the traveling direction , the loop portion 4
The vertical position of a is detected as a quantity. Therefore, when all the strips 4 are crossed, the loop amounts of all the strips 4 are individually detected. When the drive control device 12 controls the operating states of the take-up reel 7 and the drive mechanisms 11 and 11 ′ of the slitter 3 based on the detection results and the comparison results obtained as described above, the group of strips 4 It is possible to prevent an abnormal loop state from being reached beyond the limit position. Furthermore, it is possible to predict a 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. It is possible to detect whether or not the loop state of each band 4 is appropriate, and by continuously comparing the detection results, it is possible to clearly know the changing tendency of each band 4 and the overall changing tendency. Therefore, by performing drive control of the drive mechanisms 11 and 11 ′ based on the above-described detection results and comparison results, it is possible to eliminate a group of the strips 4 from entering an abnormal loop state and to perform the slit processing of the web 2. It can be performed efficiently without interruption. Furthermore, since the loop state of each band 4 can be predicted in advance from the change tendency of the loop amount, recovery processing is performed based on this prediction result, so that even if there is a large difference in the loop amount of the group of band 4 In addition, by winding each strip 4 in an appropriate state, it is possible to eliminate the occurrence of a defect or a winding defect due to an abnormal loop state at the time of slitting.

[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 a rolled steel sheet. In FIG. 1, a wide web 2 continuously fed from a rewinding device 1 is cut into a strip 4 having a predetermined width by a slitter 3, and then is passed through a pit 5 to a winding device 6.
It is wound up. Generally, the web 2 is extremely small at the time of rolling, but becomes thinner as approaching to both sides with the thickness at the center in the width being maximum. Therefore, although the take-up reels 7 provided corresponding to the respective strips 4 are driven at the same rotational speed, a difference occurs in the peripheral speed, and a difference in the winding amount between the individual strips 4 occurs. I do. A pit 5 is provided to absorb the difference in winding amount, and a loop control device is provided.

The loop control device includes a loop detection device A for detecting a loop state of the band material 4 hanging in the pit 5,
It comprises a drive mechanism 11 constituting the winding device 6, a drive mechanism 11 'for the slitter 3, a drive control device 12 for controlling an operation state of the drive mechanisms 11 and 11' based on a detection signal of the loop detector 9, and the like. . The take-up reel 7 is driven to rotate by a drive mechanism 11.

The loop detector A includes a loop detector 9
And a scanning mechanism 10 for moving this. Among them, the loop detector 9 is a commercially available laser echo type distance measuring device, which projects a laser beam (detection medium) from the light projecting window toward the bottom of the loop portion 4a of the strip 4. The laser beam reflected by the loop portion 4a is detected by the light receiving portion in the light projecting window, and from the arrival time difference in the light receiving portion between the reference beam and the reflected laser beam emitted simultaneously with the laser beam, from the bottom of the loop portion 4a. Is detected as a substantial quantity.

The scanning mechanism 10 includes a guide rail 13 disposed above the pit 5 in a state perpendicular to the traveling direction of the group of strips 4, and the traveling body 1 running along the guide rail 13.
4 and a support 15 for supporting 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 reciprocate in the left-right direction across the entire opening width of the pit 5, and thereby the loop detector 9
Is a loop 4a of a group of strips 4 hanging down into the pit 5
, The upper and lower positions of the loop portion 4a can be detected .

The drive control unit 12 recognizes the vertical position of the loop portion 4a of each band 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 is appropriate. A determination is made as to whether or not the unit 4a is within the upper and lower limit positions. Furthermore, the detection results for several times are stored, and these are compared with the latest detection results, and the individual band materials 4 are compared.
The change tendency of the loop state and the overall change tendency are recognized. Based on this recognition and the determination, the drive mechanism 11
11 'is subjected to acceleration / deceleration control, 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 will exceed the upper and lower limit positions and falls into an abnormal loop state from the tendency of change of the loop state, and is provided near the corresponding take-up reel 7 and the slitter 3. Blinking indicator. Alternatively, in the case of the winding device 6 in which the driving state of the winding reel 7 can be individually controlled, the corresponding winding reel 7 is accelerated / decelerated so that the band material 4 can be wound in an appropriate winding state. .

The total length of the web 2 is 500 to 5000.
m, the feed speed is 30 to 300 m / min. 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 It reaches 5-8 m depending on the 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 is particularly large, so that the strips 4 can be lifted. Reference numeral 18 denotes a guide roller provided above the opening edge of the pit 5.

The loop detecting device A having the above configuration
Monitors the loop state of each strip 4 while reciprocating the loop detector 9 along the guide rail 13. Therefore, abnormalities in the loop state can be individually detected for all the strips 4, and it is possible to predict in advance that the strips 4 will fall into an abnormal loop state, and to take a recovery measure. For example, in a 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 band material 4, and the coil peripheral speed can be increased to reduce the loop depth.

FIG. 3 shows another embodiment in which the scanning mechanism 10 is modified. 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 4 reciprocating along with the traveling body 14 detects the loop portion 4a of each strip 4 from the lower surface side. Has become. As still another embodiment, the guide rail 13 may be arranged at a corner of the bottom wall in a state of being inclined obliquely.

FIG. 4 shows another embodiment in which the scanning mechanism 10 is further modified. The scanning mechanism 10 is constituted by a gate-shaped support base 19 straddling the upper part of the pit 5 and an operation tool 20 provided at the center of the support base 19. By reciprocating around, the vertical position of the loop 4a of each band 4 is detected. Although details of the operation tool 20 are not shown, a mechanism equivalent to a swing mechanism of a fan can be applied.

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

[Brief description of the drawings]

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

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

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

FIG. 4 is a longitudinal sectional front view showing still another embodiment of the present invention in which a 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 4a Loop 5 Pit 7 Take-up reel 9 Loop detector 10 Scanning mechanism 11 Drive mechanism 12 Drive controller 13 Guide rail 14 Running body

Claims (3)

(57) [Claims] 1. A loop detecting device comprising a loop detector 9 for detecting a loop state of a group of slit strips 4 hanging down in a pit 5, wherein the loop detector 9 is located at the end of a loop 4a of the strip 4. The loop detector 9 is made of a non-contact type distance measuring device arranged at the bottom so that the detection medium of the loop detector 9 can reciprocate in a state intersecting the running direction of the group of strips 4. A loop detecting device which is supported by a scanning mechanism 10 above or below a loop portion 4 a of a material 4. 2. A guide rail 13 in which the scanning mechanism 10 is disposed substantially perpendicular to the running direction of the group of strips 4.
The loop detection device according to claim 1, further comprising: a traveling body that transports the loop detector along the guide rail. 3. The scanning mechanism 10 includes a loop portion 4a of the band material 4.
And a support 19 provided at a position facing the
2. The loop detection device according to claim 1, further comprising: an operation tool mounted on the device for reciprocatingly rotating the loop detector.