JPS61108419A - Telescope prevention device of hot strip mill coiling equipment - Google Patents

Abstract

PURPOSE:To improve the quality of a coil and to elevate the yield by providing a load gage respectively on both ends of both shafts of a pinch roll, also by making the rotary shaft of the mandrel of a coiler movably in the axial direction. CONSTITUTION:Load detectors 56a', 56b' and 56a, 56b are respectively arranged at both shaft ends of upper and lower pinch rolls 53. A servo valve 60 and mandrel shaft shifting position detecting device are provided further at the end of one part of a mandrel shaft 51, also a timing controlling circuit 66 is arranged. A mandrel shifting operating circuit 64 operates the shifting of the mandrel 51 based on the detecting signal of the load detectors 56a, 56b, 56a', 56b' and finds the deviation of the center position of a strip s'. This mandrel shifting quantity is inputted into a shaft locating device 63 and a feedback control is performed via the hydraulic servo valve so as to deny the deviation. Consequently the telescope of the coil is prevented and the quality and yield can be elevated.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a winding machine (coin) in a strip rolling mill equipped with a winding machine, especially a π hot strip mill.
This invention relates to a control device that prevents the coil surface shape (flatness), so-called telescope.

[Conventional technology]

Conventionally, devices of this type have been used, such as the winder of a hot strimbu mill shown in FIG. 4 and the control block shown in FIG. 5. In Figure 11g4, (1) is the coin mandrel, (2al~(2C) is the 1~ya 6 rattupar roll, (3a)~(3c144t is the air cylinder that presses the 144t spit roll towards the mandrel side, (4a)~(4
C) is the sui/da frame, (5) is the center axis of the swing motion, (6) is the buffer spring, and (7) is the upper and lower rolls that apply pressure to the strip to guide its taxis. -le, (8
] indicates a differential roller, and S indicates a string. In Figure 5, (11) is a 7-stand finishing mill (F
, ~F71 rolling rolls, (6) is an electric motor that drives each rolling roll, (6) is a speed control device for each electric motor (6), (b) is a pinch roll, (g) is a pinch roll α
→ is the drive motor, QQ is the speed control device for the motor (2), and the signal from the speed detector outputs a voltage signal corresponding to the speed of the motor (2) in charge of the final stud F7.
The speed setting signal is input via the roll diameter correction device Qυ and the advanced rate correction calculation a (a). αη is a coin,
1.1 barrel is the drive 1it11-C motive of coin αη, (to)
is the current control device for electric motor αq, and the winding tension controller (c)
is inputting a signal from

Next, the operation of the conventional device configured as described above will be explained. Strip S from finishing mills F1 to F
is Bi/Tirol Tawaraso (or (power) and then Koirama/
Rolled or rolled strips on the drell (or (1)) S tl- on the trunout table (8)
100 OFF! /1llll+, and after passing the pinch roll 04 (straddle (7)), the wrapper roll (
It is guided between 2a) to (2c) and the mandrel←η (or (1)), and winding is started. When the strip S is wound around the mandrel (17)l or (1)1, the smooth rolls (2al to (2c)
a) to (3cl) operates to prevent the occurrence of scratches on the surface of the n1 coil. Also, the winding controller (c) controls the predetermined winding according to parameters such as the outer diameter of the coil and the cross-sectional dimensions of the strip. The required torque deviation or relaxation value of the coin motor CI mark to generate the take-up tension is calculated, and this is applied to the current control device #f (1'9) to control the coin take-up tension. /The rotational speed of the Tyrol α field is as follows while the strip S exists across the rolling roll α of the finishing mill F, and the pinch roll a=++ (the total length of the strip S reaches 500~1oooom, whereas The distance between is less than ioom"tf) and there is a sheathing that is synchronized with the finishing mill speed. Furthermore, the exact distance C (is the exit strip speed of the final stand F7 of the finishing mill,
It is necessary to control the circumferential speed of the pinch roll q4 so that the □pole coincides with the roll circumferential speed of the pinch roll q4.

Therefore, in the apparatus shown in FIG. 5, the rotational speed NPR of the pinch roll q41 is calculated as shown in equation [1],
Control is based on this.

Here, N7; F, rotational speed of the stand rolling roll DPRj diameter D of the pinch roll? : Diameter of FT stand rolling roll; Advanced rate [Problems to be solved by the invention] The conventional control device is configured as described above, but the problems include strip surface scratches, scratches/grips, and top Occurrence of head marks, etc., defective winding shape (telescope), etc. As a countermeasure for this problem, hydraulic coins have been introduced in recent years, but the current situation is that no effective countermeasures have yet been taken for the poor winding shape. As shown in Figure 6, this defective winding shape means that the end faces of the coil are non-parallel, and the ends of the coil layer are uneven near the tip of the IJ tube being wound, sometimes in the center. This is the occurrence of a phenomenon called telescoping.

Such unevenness of the end position may be caused by the stress coming from the out table (1) if the guide of the width direction position of the knob S is defective, or by the gap between the upper and lower pinch rolls or the width direction of the pressing force. This is caused by unevenness and poor parallelism between the mandrel axis and the smooth roll axis or pinch roll axis, and in conventional equipment, no active countermeasures have been taken to prevent this defective winding shape. However, the process was based on experience and intuition from actual operations. For this reason, it is difficult to quickly respond to the occurrence of telescoping due to machine wear and operational red (f+ changes), which leads to a decrease in coil quality and a decrease in yield due to an increase in the amount of edge trimming. was developed to solve these problems, and actively controls the shape of the coil end face using closed-loop control to prevent the telescope phenomenon, improve coil quality, and reduce the amount of edge trimming. The purpose is to improve yield and improve workability in the next process (cold rolling mill, etc.).

[Means for solving problems]

The telescope prevention device according to the present invention is provided with load meters on both bearings of the upper and lower pinch rollers, and detects the center of the strip during coil winding based on the detected load using a stub l-1j hub center detection circuit, The present invention is characterized in that the amount of axial movement of the mandrel or the pinch roll is determined by an arithmetic circuit based on the strip center position deviation signal, and the amount of movement of the mandrel or the pinch roll is determined by a moving device.

[Effect]

In this invention, while the strip in one stroke is passing through the pinch roll, the center of the strip is monitored online from the load detected by the load detectors installed on both pinch roll bearings. Then, according to the deviation signal, move the manotrel rotating shaft 1 or 1"°-' rotating shaft 1 in the axial direction. Since closed loop (feedback) control is performed, the occurrence of telescoping phenomenon can be effectively prevented.

〔Example〕

FIG. 1 is a block diagram of a control system showing an embodiment of the present invention. In the figure, 51) is a coiled manodrel, 6
a is the coil being wound, 631 is the pinch roll, (b)
is the tape/l10-ra, <55al, (55bl is the cell that detects the presence of the strip S, (56al, (
56bl is a load detector (56a' l, (56b' l is a load detector attached to both ends of the upper pinch roll. River is a servo valve, and 61) is a load detector (56a'l) attached to both ends of the lower pinch roll. Hydraulic cylinder that operates in the direction, 6-pin mandrel shaft shift position detection device, 1 is a high-speed positioning control device for axial shift of the mandrel shaft, - is axial movement of the mandrel shaft based on the strip center position distance signal Arithmetic circuit for calculating quantities, (to)
is a circuit that detects the center position of the strip S from the load signal from each load detector, - is the detector (55al, (ss
This is a timing circuit that outputs the strip center position lock-on timing, APC control timing, winding onto the mandrel, and completion of winding from the passing signal according to b). (70) is the load signal from each load detector, σ
υ is the distance signal between the reference point and the strip center position output from the strip center position detection circuit, (72 is the movement amount signal output from the calculation circuit (the sensor), and σJ is the distance signal output from the sensor (
55a), (passing signal from 55bl, σ is a timing signal, (1) strip center position lock-on timing, (it) ApcIII (ill timing,
(U+) Consists of winding on the mandrel and winding completion signal.

In the telescoping and cope prevention device configured as described above, load detectors (56a) attached to both shafts of the pinch roll Q, (56bl, (56a' l, <5
6b' ) detected load signal F' a + F b
+F a' and F b' can be expressed by the following equations, ignoring the load of the roll itself.

Fa = P, + Q.

Fb/= pb where Pa, P b Reaction force from p strip a 14
11 or the load generated on the b side Qa, Qb; the load generated on the a side or the b side due to the strip tension / .

ΔFb =Fb -Fb' =Qb Next, the detection of the strip center position by the pinch roll 53iK will be explained with reference to FIG. In the figure, S is the strip, line C is the center of the strip, lc is the distance from line a to line C of the load detector (56al, (56a'), and this distance is the center position detection circuit (b). [Calculated using formula 4a.

11c=□−・・・・・・・・・・・・・・・[4]1
+(ΔFm/ΔFb 1 Here, l is the distance between both load detectors (56a), (56bl, and the obtained distance lc corresponds to the signal συ,
This is an amount that changes from moment to moment during winding.

On the other hand, in the timing control circuit 1ti61, a timing signal as shown in FIG. 6 is generated. In the figure, 85
5a + 555b is the load detector (55a1. (b5
b) (7) ``Signal signal'' 74a is the timer time TD that is started on S55.
6574b is a pulse signal that is output during step 2, and is used for the lock-on timing of the center position and distance lc. 6574b is a signal that is output at the falling edge of 855□ from the completion of lock-off (that is, the falling edge of S73.). , during this time the arithmetic circuit +6t'i
Calculate the mandrel shift amount (7) with l. Also, 574
(is a signal that is output from the falling edge of 55511 to the falling edge of 8555, and holds the mandrel shift amount σ2 output from the arithmetic circuit during this period.

Therefore, the arithmetic circuit calculates the center position distance 1ct71) by 5
Lock-on distance lc0 at lock-on timing of 741
Then, the deviation Δlc of the center position distance from the lock-on value can be obtained from equation [5].

Δlc = llc −1co ・・・・・・・・・
......[5] And the on period of 574b,
In the arithmetic circuit +667, the deviation ΔlC is output to the mandrel shaft positioning device k+l13) with the same polarity as the mandrel shaft shift amount via the controller, and the positioning device t63) detects the mandrel shaft t5 by the position sensor 6z.
1) Since the current position is not returned, the hydraulic servo valve 6o
Operate I to shift the master/drel shaft hydraulic cylinder Tfil.
closed loop (feedback) control is performed to cancel the telescope caused by the deviation Δllc. Next, when 574b turns off, the shift amount at this point is held until 574c turns off, and S7. c After turning off, it returns to the position before winding started.

In the above embodiment, the mandrel shaft was moved 7 feet in the axial direction to compensate for the stript center position deviation Δlc, but the rotational axes of the mandrel (511 and pinch roll ■) are parallel to each other. Therefore, it is possible to compensate for the deviation Δlc by shifting the pinch roll axis in the axial direction.Alternatively, it is possible to compensate not only for the deviation Δlc due to uneven installation of the mandrel or pinch roll, etc. , between the mandrel and the pinch roll, etc., a new telescope correction roll may be provided to compensate for the deviation ΔlC.

〔Effect of the invention〕

As explained above, this invention monitors the center position deviation of the strip on the pinch rolls over almost the entire period during coil winding, moves the mandrel or pinch rolls in the axial direction according to the deviation, and winds the coil. Since the end face shape is controlled in a closed loop, the quality of the coil can be improved, the amount of edge trimming can be reduced, the yield can be improved, and workability in the next process (cold rolling mill, etc.) can be improved. There is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a telescope prevention device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of strip center position distance detection in a bar/challenge, and FIG. 6 is a time chart of timing signals. FIG. 4 is a block diagram of a conventional hot strip mill winder, FIG. 5 is a control block diagram thereof, and FIG. 6 is a perspective view and a side view showing the telescope phenomenon. In the figure, (1), 5υ are coiler mandrels, 52 is a coil being wound, (7), α41, 53) are pinch rolls, (s), t54) are table rollers, (55a)
, (55b) is a strip detector/su, (56a),
(56bl, (56a' 1. (56b') is a load detector, the plane is a hydraulic servo valve, 6υ is a hydraulic cylinder,
16 is a shift position detection device, l is a high-speed positioning device,
1b51 is a strip center position detection device, and 1661 is a timing control circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) In a hot strip mill winding equipment consisting of a pinch roll and a winder, each load cell is installed at both ends of both shafts of the pinch roll, and the center of the strip during coil winding is detected from the load signal from the load cell. It is characterized by comprising a detection circuit that detects the position, a device that moves the mandrel rotating shaft of the winding machine in the axial direction, and a calculation circuit that calculates the amount of movement of the mandrel based on the strip center position deviation signal. Telescope prevention device for hot strip mill winding equipment. (2) A device for moving the pinch roll rotating shaft in the axial direction, a conventional mandrel, and an arithmetic circuit that calculates the amount of movement of the pinch roll based on the strip center position deviation signal. A telescope prevention device for hot strip mill winding equipment as claimed in claim 1.