JPH1029007A - Instrument for detecting roll slip of steel strip rolling mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain and prevent the occurrence of slippage between rolls by providing a detecting means for detecting the slippage between the rolls with a pulse counter detected by a pulse detecting means. SOLUTION: When the pulse counter 6 count-integrates the pulse outputted from a work roll fitting PGW 5 and inputs a backup roll pulse PGB 2, the count value PWI is outputted to an arithmetic circuit 9 and at the same time, the count value is reset and the count integration of the PWI of the PGW outputted pulse is again repeatedly executed from zero. The arithmetic circuit 9 outputs the slippage ratio R between the rolls to a comparator 10 and a comparator 13. The comparator 10 compares an allowable slippage ratio R1 and the slippage ratio R between the rolls outputted from the arithmetic circuit 9, and when the R is larger than the allowable ratio R1, the allowable excessing signal is outputted to an alarm generator 12 to call the countermeasure for reducing the slippage between the rolls.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll / slip detecting device for a steel sheet rolling mill for detecting a roll / slip of a steel sheet rolling machine with or without an intermediate roll.

[0002]

2. Description of the Related Art Steel sheet cold rolling mills are used to improve sheet shape.
It is rarely composed of a pair of upper and lower rolls, and a four-high rolling mill equipped with a work roll in contact with the rolled material and a backup roll that suppresses deflection due to the rolling load of this work roll, or an intermediate between the work roll and the backup roll A 6-high rolling mill having rolls vertically and a multi-high rolling mill having a plurality of intermediate rolls and a plurality of backup rolls vertically are used. Then, the work roll and the intermediate roll or the backup roll are pressed against each other at a predetermined pressure, and come into contact with each other and rotate at the same circumferential speed.

Usually, the upper and lower rolls of a rolling mill are driven by an electric motor. In this case, a work roll is driven, and a backup roll or an intermediate roll is a free roll without a driving motor, and a work roll is composed of a work roll. There is a rolling mill in which a backup roll or an intermediate roll is driven by a free roll.

In the former rolling mill, since the work roll has a rolling load and receives a motor driving torque, a large torque difference or a torque transmission between the work roll and the intermediate roll or between the work roll and the backup roll is required. Does not occur.

[0005] In the latter rolling mill, a work roll having a rolling load is not directly driven by an electric motor but driven through a contact frictional force with an intermediate roll or a backup roll, and a large torque transmission is required between the rolls. Slip may occur between a work roll and an intermediate roll or between a work roll and a backup roll. If slip occurs between the rolls, the speeds of the inlet and outlet sides of the rolling mill and the strip tension become unstable, and as a result, the thickness of the sheet fluctuates. There is a drawback that the surface is scratched and the rolled material is scratched, and the roll wear becomes severe, requiring frequent roll polishing and shortening the roll life.

[0006]

As described above, in a rolling mill in which a work roll is not driven by an electric motor, roll slip is likely to occur, and the thickness of the work roll may fluctuate.
The problem that the rolled sheet itself becomes impossible, the roll surface is scratched and the rolled material is scratched, and the roll wear becomes severe, requiring frequent roll polishing and shortening the roll life was there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and it is possible to easily and easily perform a roll slip without actually measuring and setting a roll diameter for detecting inter-roll slip.
Precisely detects the occurrence of slip and warns the occurrence of slip, prevents rolling while slipping, saves and saves rolling conditions when slip occurs, makes it easy to change the next rolling condition, and prevents roll and slip occurrence It is an object of the present invention to provide a roll / slip detecting device for a steel sheet rolling mill which enables the following.

[0008]

In order to achieve the above object, a first aspect of the present invention is a roll / slip detecting apparatus for a steel sheet rolling mill having or not having a work roll, a backup roll, and an intermediate roll. A pulse detecting means for detecting a rotation speed of the work roll, and a detecting means for detecting a slip between the rolls based on a pulse count detected by the pulse detecting means.

According to a second aspect of the present invention, there is provided a roll and slip detecting device for a steel sheet rolling mill according to the first aspect, wherein
There is provided a setting means for setting a slip allowable value, and a storage means for storing the actual rolling value at the time of the occurrence of the roll slip by comparing with the allowable value set by the setting means.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a roll configuration of a four-stage steel plate rolling mill to which the present invention is applied, that is, a roll configuration of a four-stage steel plate rolling mill composed of a pair of upper and lower work rolls 4 and 4A and backup rolls 1 and 1A. ing. 17 is a steel plate.

FIG. 2 is a block diagram of a roll / slip detecting device according to an embodiment (corresponding to claims 1 and 2).
This is applied to the roll configuration of the four-stage steel plate rolling mill in FIG. That is, a pair of upper and lower work rolls 4 and 4 in FIG.
FIG. 2 is a configuration diagram of a roll / slip detecting device between a work roll 4 as an upper roll and a backup roll 1 of a four-stage steel plate rolling mill composed of A and backup rolls 1 and 1A.

In FIG. 1, a pulse generator (PGB) 2 directly connected to a backup roll 1 outputs one pulse per rotation. That is, one pulse is output by one rotation of the backup roll, and this pulse (PGB output pulse) becomes a count reset signal of the pulse counter 6. Pulse generator (PGW directly connected to work roll 4)
5) outputs PW pulses in one rotation. That is,
PW pulses are output to the pulse counter 6 with one rotation of the work roll. The pulse counter 6 counts and integrates the pulse (PGW output pulse) output from the work roll pulse, and when the backup roll pulse is input, outputs the count value PW1 to the initial value storage circuit 8 and the arithmetic circuit 9,
At the same time, the count value is reset and the work roll pulse is counted again from 0.

Next, the operation of the pulse counter will be described with reference to the block diagram of FIG. 2 and the waveform diagram of FIG. First, as a preparatory work for slip detection between the rolls, the backup roll drive motor 3 is driven before the start of the rolling operation while the work roll 4 and the backup roll 1 are pressed against each other with a constant pressing force.
To spin at low speed. The initial idling is performed for two or more backup rolls. During the roll idle, an initial idle signal is output to the initial value storage circuit 8. The initial value storage circuit can rewrite the stored value while the initial idle signal is being output.

After the start of idling, the count value PW1 is output to the initial value storage circuit 8 and the arithmetic circuit 9 by the first PGB output pulse, and at the same time, the count value is reset to 0 to P
Performs GW output pulse count integration. When the initial idle rotation is performed by two rotations of the backup roll, the counter 6 outputs the count value PW1 to the initial value storage circuit 8 and the arithmetic circuit 9 by the second PGB output pulse, resets the count value at the same time, and outputs PGW from 0 again. The pulse count integration is performed, the initial idle signal is reset, and the initial value storage circuit 8 stores the PGW signal during one rotation of the backup roll.
The output pulse PW0 is stored. That is, the work roll rotation amount NW0 during one rotation of the backup roll during the synchronous rotation without slip between the two rolls by rotating the backup roll 1 of the work roll 4 pressed against the rolled plate at a low speed is expressed by the formula (1). You. NW0 = PW0 / PW (1)

After the above-described preparatory operation for detecting inter-roll slip, the rolling strip passing is started. During rolling, the backup roll 1 is driven by the electric motor 3 to rotate, and the work roll 4 to be pressed against also rotates interlockingly with the backup roll 1 while receiving rolling resistance torque from the rolled material 17. The pulse counter 6 counts the pulses output from the work roll mounting PGW and integrates the backup roll pulse PG
When B is input, the count value PW1 is output to the arithmetic circuit 9, and at the same time, the count value is reset and again from 0 to PGW
The count integration of the output pulse PW1 is repeated. The work roll rotation amount NW during one rotation of the backup roll is expressed by equation (2). NW = PW1 / PW (2)

At this time, the inter-roll slip amount S during one rotation of the backup roll is expressed by equation (3). S = NW0-NW (3)

The inter-roll slip ratio R during one rotation of the backup roll at this time is expressed by the following equation (4). R = (NW0−NW) / NW0 (4)

Further, equation (5) is obtained from equations (1) and (2). R = 1−PW1 / PW0 (5) The operation circuit 9 performs the operation of the expression (5) and outputs the inter-roll slip ratio R to the comparators 10 and 13. Comparator 10
Compares the allowable slip rate R1 preset by the setting unit 11 with the inter-roll slip rate R output from the arithmetic circuit 9, and when the slip rate detection value R is larger than the allowable slip rate R1, generates an allowable excess signal. The alarm is output to the alarm generator 12 to generate an alarm, and to the operator of the rolling mill, the tension at the entrance of the rolling mill,
It is possible to prompt measures to reduce inter-roll slip by changing the delivery side tension, rolling speed, rolling pressure, upper and lower roll different peripheral speed ratio, and the like.

The comparator 13 compares the allowable slip ratio R2 preset by the setting device 14 with the inter-roll slip ratio R output from the arithmetic circuit 9, and the detected slip ratio R is larger than the allowable slip ratio R2. In this case, a permissible excess signal is output to the storage circuit 15 as a command, and the actual values of rolling conditions such as the input side tension, the output side tension, the rolling speed, the rolling pressure, the vertical roll differential speed, etc. of the rolling mill at the time of the permissible excess and the slip between rolls. The rate detection value R is stored and stored, and it becomes easy to change the next rolling condition value from the actual rolling condition value at the time of occurrence of a slip.
Enables prevention of slip occurrence.

As described above, according to this embodiment, the roll slip ratio for each rotation of the backup roll is detected during the rolling operation. The detected roll / slip ratio is input to the comparator 10 and is compared with a permissible value set by the setting device 11 to generate an alarm if the permissible value is equal to or larger than the permissible value.
Further, the actual rolling value at the time of the occurrence of the roll slip is stored and stored in the storage circuit 15 by comparing and discriminating with the allowable value set by another setting device 14.

FIG. 4 shows a roll configuration of a 6-high steel plate rolling mill to which the present invention is applied, that is, a 6-high steel rolling mill having a roll configuration having intermediate rolls 18 and 18A. In the case of the roll configuration having the intermediate rolls 18 and 18A as described above, the roll slip ratio for each rotation of the intermediate roll or the backup roll is detected during the rolling operation. It is input to the comparator 10 and compared with the allowable value set by the setting device 11 to generate an alarm if it is equal to or larger than the allowable value.
The rolling actual value at the time of the occurrence of the roll slip is stored in the storage circuit 15 by comparing and discriminating with the allowable value set by the above.

Although the present invention has been described with reference to the roll configuration of the four-high steel rolling mill shown in FIG. 1 and the roll configuration of the six-high steel rolling mill shown in FIG. 4, the same applies to a multi-high rolling mill having a plurality of intermediate rolls. Can be applied.

[0023]

As described above, the present invention (Claim 1)
According to claim 2), the roll slip can be detected easily and with high accuracy without actually measuring and setting the roll diameter, and the occurrence of slip between rolls can be suppressed or prevented. As a result, it is possible to provide an inter-roll slip detecting device that can perform stable rolling of a steel sheet with less occurrence of roll scratches and with no variation in threading speed, variation in tension on the entry side or exit side, and variation in sheet thickness.

[Brief description of the drawings]

FIG. 1 is a perspective view of a roll configuration of a four-high rolling mill to which the present invention is applied.

FIG. 2 is a block diagram of a roll slip detector of a four-high steel plate rolling mill according to an embodiment of the present invention.

FIG. 3 is a waveform chart for explaining the operation of the pulse counter of FIG. 2;

FIG. 4 is a perspective view of a roll configuration of a six-high rolling mill to which the present invention is applied.

[Explanation of symbols]

1, 1A: backup roll, 2, 5: pulse generator, 3: roll drive motor, 4, 4A: work roll,
6 pulse counter, 7 initial idle signal generator, 8 initial value storage circuit, 9 arithmetic circuit, 10, 13 comparator, 1
1, 14: setting device, 12: alarm generator, 15: storage circuit, 16: rolling performance value detector, 17: steel plate, 18, 18
A: Intermediate roll.

Claims (2)

[Claims] 1. A pulse detecting means for detecting a rotation speed of a work roll in a roll / slip detecting device of a steel plate rolling mill having or not having a work roll, a backup roll, and an intermediate roll, and the pulse detecting means. Detecting means for detecting the slip between the rolls based on the pulse count detected in the step (a). 2. A roll / slip detecting apparatus for a steel sheet rolling mill according to claim 1, wherein said setting means sets a roll / slip allowable value, and said roll / slip is determined by comparing said roll / slip with said allowable value set by said setting means. Storage means for storing the actual rolling value at the time of occurrence, a roll / slip detecting device of a steel plate rolling mill.