CN213223765U - Control system for shutdown of rolling mill - Google Patents

Abstract

The utility model discloses a control system for shutdown of a rolling mill, which comprises a rolling mill control unit, a main control unit, a plate thickness control module and an industrial control computer, the outlet and the inlet of the rolling mill working roll are both provided with a thickness gauge and also comprise an encoder for detecting the length of a rolled plate, the plate thickness control module is respectively connected with the encoder and the thickness gauge, the plate thickness control module is mutually connected with the industrial control computer and interacts data, the plate thickness control module compares the set data of the plate thickness to be rolled by the target when the length of the rolling mill working roll from the plate tail rolling line reaches the set length with the real-time data obtained from the thickness gauge, thereby sending a command of speed reduction or delayed stop to the rolling mill, the main control unit is respectively connected with the plate thickness control module and the rolling mill control unit, it receives the instruction of thick control module of board, the utility model provides a high and extravagant material's of factor of safety rolling mill control system that shuts down.

Description

Control system for shutdown of rolling mill

Technical Field

The utility model relates to a steel band production facility technical field especially relates to a control system that rolling mill shut down.

Background

When the prior reversible rolling mill is adopted to produce steel strips by cold rolling, all main performance indexes after production meet the production requirements, but the plate tail part of a rolled plate is slightly insufficient in control aspect, and the improvement space is provided. The reversible mill performs cold rolling on the steel strip for multiple times so as to meet the use requirement. According to the prior art, a control system of the thickness of a rolled plate is disclosed on a national intellectual property office website, wherein the notice number is CN106180207B, the steel plate is fed into a rolling mill for rolling, the thickness of the steel plate before and after rolling is monitored in real time by a thickness meter, and when the real-time data of the thickness of the steel plate before rolling measured by the thickness meter exceeds 2 percent but is less than 5 percent of the set data of the thickness before rolling, the rolling mill unit is decelerated for production; and when the thickness gauge measures that the real-time data of the thickness of the steel plate before rolling is 5% thicker than the set data of the thickness of the steel plate before rolling, the rolling mill unit is stopped. The rolling mill unit is decelerated or stopped only by using a thickness gauge to test the thickness of the steel plate before rolling, so that accurate stopping cannot be realized, and if the steel plate passes through a rolling line, accidents are caused, and the safety factor is low; if the calculated length is shorter than the actual length, the rolling mill stops in advance, and materials are wasted.

And calculating the length of the steel plate in rolling, wherein the length is calculated by adding the number of turns of the mandrel to the thickness data of the thickness gauge on the basis of the initial diameter of the inner ring of the mandrel being 525 mm. This calculation method has two disadvantages: firstly, the initial diameter of the inner ring is not accurate enough at 525 mm: the diameter of the expanded mandrel is 508mm, the steel plate wound on the mandrel is about 3-4 circles, the raw materials have specifications of 2.5mm, 2.75mm and 3.0mm, if the raw materials are 2.75mm thick, the thicknesses of all manufacturers are different, some manufacturers adopt positive tolerance control, some manufacturers adopt negative tolerance control, the initial diameter of the inner ring is not accurate enough, and the calculation of the diameter and the length based on the initial diameter is not accurate enough; second, hysteresis of mandrel diameter calculation: the thickness detection position of the thickness gauge has a position difference of 1-3 meters with the mandrel, the thickness of the mandrel is 1-3 meters before the diameter of the mandrel is calculated, the thickness has no large deviation under normal conditions, the calculation has no problem, and when the thickness is thicker or thinner, the calculation has deviation. Due to the calculation of the rolling length, the length error of 1 coil of steel coil can be plus or minus 5m (1 coil of 20 tons or so, if rolled to be 0.39mm thick, the length is 6000 meters, if rolled to be 0.265mm thick, the length exceeds 9500 meters), if the calculated length is longer than the actual length; the rolling mill is assumed to have the length, and passes through a rolling line, so that accidents are caused, and the safety coefficient is low; if the calculated length is shorter than the actual length, the rolling mill stops in advance, and materials are wasted.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the defects of the prior art are overcome, and the control system for stopping the rolling mill, which has high safety coefficient and can not waste materials, is provided.

In order to realize the purpose, the technical scheme of the utility model is that:

a control system for shutdown of a rolling mill comprises a rolling mill control unit, a main control unit, a plate thickness control module and an industrial control computer, wherein thickness gauges are arranged at an outlet and an inlet of a rolling mill working roll, the control system also comprises an encoder for detecting the length of a rolled plate, the plate thickness control module is respectively connected with the encoder and the thickness gauges, the plate thickness control module and the industrial control computer are mutually connected and exchange data, the plate thickness control module compares set data of the plate thickness to be rolled by a target when the length of the rolling mill working roll from a plate tail rolling line reaches the set length with real-time data obtained from the thickness gauges so as to send a command of speed reduction or delayed shutdown to the rolling mill, and the main control unit is respectively connected with the plate thickness control module and the rolling mill control unit and receives the command of the plate thickness control module.

After the structure more than adopting, compared with the prior art, the utility model has the following advantage: utilize the encoder to detect the length of rolling plate, when rolling mill worker roller reached the settlement length from last rolling line, increase a precision control, detect thickness 10% (last rolling line) on the contrary with the calibrator, delay 2 seconds and park again, if detect thickness and do not reach thickness 10% on the contrary with the calibrator, then slow down the rolling mill, it parks to delay 2 seconds again when detecting thickness 10% on the contrary with the calibrator, two adjacent rolling lines on the same side of steel sheet only have about 0.2 meters like this, the utilization ratio of material is improved, high safety factor, can not waste the material.

Preferably, the rolling mill control unit 1 comprises a frequency converter 4 and a motor 7, the frequency converter 9 is connected with the motor 7, the main control unit 2 is connected with the frequency converter 4, and the main control unit 2 receives an instruction of the plate thickness control module 3 and controls the frequency converter to adjust the rotating speed of the motor.

The encoders 5 are respectively arranged on the guide roll and the plate-shaped roll 207, and the lengths before and after rolling are different, so that the encoders are required to be arranged on the guide roll and the plate-shaped roll for detection.

The encoder 5 is an ohm dragon high-precision encoder with high precision.

The thickness gauge 206 is an X-ray thickness gauge, X-rays are emitted from the X-ray thickness gauge, the thickness gauge is a non-contact thickness gauge, the thickness gauge can adapt to severe environments of a steel rolling field, the measurement precision is high, and the X-ray thickness gauge is combined with a computer and an automation technology.

The plate thickness control module 3 stores plate thickness setting data, and can compare the plate thickness setting data to be rolled with real-time data obtained from the thickness gauge 206, thereby outputting a speed-reducing or delay-stopping command to the rolling mill.

The plate thickness control module 3 realizes the functions thereof through a plate thickness PLC.

And the thickness meter 206 delays the machine to stop the machine for two seconds when the real-time data of the thickness of the steel plate tail exceeds 10% of the set data of the thickness before rolling.

A control method of a rolling mill stop control system comprises the following steps:

firstly, a steel coil is arranged on an inlet uncoiling machine, and after the steel coil is ready, the operation starts to be rolled for the first time: starting an inlet uncoiler 101, sending the head of a steel coil to an outlet tension roller 111, pushing up a hydraulic cylinder 110 to push up to enable a rolling mill worker roller to press a steel plate, starting a rolling mill, starting a thickness gauge 206 and an encoder 5, wherein the thickness gauge 206 measures the thickness of the steel plate before and after rolling respectively, and the encoder 5 measures the length of the steel plate before and after rolling respectively;

secondly, the steel coil is wound on an outlet tension roller 111, the rolling mill stops when the plate tail of the steel coil stops near an inlet tension roller 105, the first rolling is finished, rolling lines are formed on the plate head and the plate tail of the steel coil, and the plate tail of the steel coil penetrates through the inlet tension roller 105;

and thirdly, performing multi-pass rolling later, winding the steel coil back and forth between the outlet tension roller 111 and the inlet tension roller 105, comparing set data of the thickness of the target rolled plate when the length of the steel coil rolling line from a working roller of the rolling mill reaches the set length with real-time data obtained from a thickness gauge 206, delaying the machine halt for two seconds when the real-time data of the thickness of the steel plate tail measured by the thickness gauge 206 exceeds 10% of the set data of the thickness before rolling, and decelerating when the real-time data of the thickness of the steel plate tail measured by the thickness gauge 206 does not exceed 10% of the set data of the thickness before rolling.

Compared with the prior art, the utility model has the following advantage: the control method can be used for more accurately stopping the rolling mill, the length of a rolled plate is detected by using the encoder, when a rolling mill roller is away from the last rolling line and reaches a set length, a precision control is added, the thickness gauge detects that the thickness of the rolled plate is higher than 10%, and the rolling mill is stopped after delaying for 2 seconds, if the thickness gauge detects that the thickness of the rolled plate is not higher than 10%, the rolling mill is decelerated until the thickness gauge detects that the rolled plate is higher than 10%, and the rolling mill is stopped after delaying for 2 seconds, so that two adjacent rolling lines on the same side of the steel plate are only about 0.2 m, the utilization rate of materials is improved, the safety coefficient is high, and the materials are not wasted.

Drawings

FIG. 1 is a layout diagram of a control system rolling mill for rolling mill shutdown according to the present invention;

fig. 2 is a schematic circuit diagram of a control system for rolling mill shutdown according to the present invention.

The automatic thickness measuring device comprises a rolling mill control unit 1, a rolling mill control unit 2, a main control unit 3, a plate thickness control module 4, a frequency converter 5, an encoder 6, an industrial personal computer 7, a motor 101, an inlet uncoiling machine 102, a press roll 103, a telescopic guide plate 104, a leveling machine 105, an inlet tension roll 106, a CPC 107, a wedge block 108, a backing roll 109, a work roll 110, an upward pushing hydraulic cylinder 111, an outlet tension roll 112, a press roll 206, a thickness gauge 207 and a plate roll.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

As shown in fig. 1 and 2, the utility model provides a control system for shutdown of rolling mill, which comprises a rolling mill control unit 1, a main control unit 2, a plate thickness control module 3 and an industrial control computer 6, wherein the outlet and the inlet of the rolling mill work roll 109 are provided with a thickness gauge 206, the control system also comprises an encoder 5 for detecting the length of the rolled plate, the plate thickness control module 3 is respectively connected with the encoder 5 and the thickness gauge 206, the plate thickness control module 3 and the industrial control computer 6 are mutually connected and exchange data, the plate thickness control module 3 compares the set data of the plate thickness to be rolled by the target with the real-time data obtained from the thickness gauge 206 when the length of the rolling mill work roll from the plate tail rolling line reaches the set length, thereby sending a command of slowing down or delaying shutdown to the rolling mill, the main control unit 2 is respectively connected with the plate thickness control module 3 and the rolling mill control unit 1, and receives the command of the plate thickness control module 3, the utility model has the advantages that utilize encoder 5 to detect the length of rolling the board, the rolling mill worker roller is from last one rolling line when reaching settlement length, increase a precision control, detect thickness 10% (last rolling line one) on the contrary with calibrator 206, delay 2 seconds and park again, if detect thickness with calibrator 206 and do not reach thickness 10% on the contrary, then slow down the rolling mill, delay 2 seconds and park again when detecting thickness 10% on the contrary with calibrator 206, two adjacent rolling lines on the same side of steel sheet only have about 0.2 meters like this, the utilization ratio of material has been improved, factor of safety is high, can not waste the material.

Specifically, the guide roll is provided between the thickness gauge 206 and the entrance tension roll 105, which is not shown in fig. 2, and the encoders 5 provided on the plate roll 207 and the guide roll are not shown in fig. 2, and there are two thickness gauges 206 respectively provided on both sides of the work roll 109, and as shown in fig. 2, the thickness gauge 206 provided on the left side of the work roll 109 is not shown.

As shown in fig. 2, the rolling mill comprises an inlet unwinder 101 and its press rolls 102, a telescopic guide plate 103, a leveler 104, an inlet tension roll 105, a CPC 106, a wedge 107, two back rolls 108, two work rolls 109, two push-up hydraulic cylinders 110, an outlet tension roll 111 and its press rolls 112. The telescopic guide plate 103, the leveling machine 104, the CPC 106, the two work rolls 109, the outlet tension roll 111 and the compression roll 112 thereof are sequentially arranged from the same direction gradually away from the inlet uncoiler 101, and the inlet tension roll 105 is arranged between the work roll 109 and the inlet uncoiler 101. The two work rolls 109 are arranged in parallel, a work gap is formed between the work rolls, back rolls 108 are respectively arranged on the outer sides of the two work rolls 109, wedges 107 are arranged on the back rolls 108 located above, and two push-up hydraulic cylinders 110 are arranged below the back rolls 108 located below. The entrance unwinder 101 is provided with a first-pass rolled steel plate material which slides out from between the entrance unwinder 101 and the press roll 102 thereof, passes over the telescopic guide plate 103, is flattened by the leveler 104, passes through the CPC 106, is rolled by the work gap of the two work rolls 109, and is wound up by the exit tension roll 111. The up-and-down movement of the push-up hydraulic cylinder 110 can adjust the width of the working gap, thereby adjusting the thickness of the rolled steel plate.

A control method of a rolling mill stop control system comprises the following steps:

firstly, a steel coil is arranged on an inlet uncoiling machine 101, a press roll 102 presses the steel coil, and after the steel coil is ready, the operation starts to be rolled for the first time: starting an inlet uncoiler 101, sending the head of a steel coil to an outlet tension roller 111, wherein the outlet tension roller 111 is provided with a clamping opening for clamping the head of the steel coil, the steel plate winds 2-3 circles on the outlet tension roller 111, an upward pushing hydraulic cylinder 110 pushes upwards to enable a rolling mill work roll to press the steel plate, a rolling mill is started, a thickness gauge 206 and an encoder 5 are also started, the thickness gauge 206 measures the thickness of the steel plate before and after rolling respectively, the encoder 5 measures the length of the steel plate before and after rolling respectively, the length needs to be calculated by the encoder 5 on a guide roll, and the thickness gauge 206 on the right side of the work roll 109 is used for calculating the thickness;

secondly, the steel coil is wound on an outlet tension roller 111, the rolling mill stops when the plate tail of the steel coil stops near an inlet tension roller 105, the first rolling is finished, rolling lines are formed on the plate head and the plate tail of the steel coil, and the plate tail of the steel coil penetrates through the inlet tension roller 105;

thirdly, operating to start the second pass rolling: when the length of the steel coil plate tail rolling line from a working roller of a rolling mill reaches a set length, set data of the plate thickness to be rolled in a target mode is compared with real-time data obtained from a thickness gauge 206, delay is delayed for two seconds when the real-time data of the thickness of the steel plate tail measured by the thickness gauge 206 exceeds 10% of the set data of the thickness before rolling, speed is reduced when the real-time data of the thickness of the steel plate tail measured by the thickness gauge 206 does not exceed 10% of the set data of the thickness before rolling, second-pass rolling is completed when the rolling mill stops, the length needs to be calculated by an encoder 5 on a plate-shaped roller 207, and the thickness is calculated by the thickness gauge 206 on the left side of a working roller 109;

fourthly, running and starting the third rolling: when the length of the head rolling line of the steel coil from a working roll of the rolling mill reaches a set length, set data of the thickness of a target plate to be rolled is compared with real-time data obtained from a thickness gauge 206, delay is delayed for two seconds when the real-time data of the thickness of the tail of the steel plate measured by the thickness gauge 206 exceeds 10% of the set data of the thickness before rolling, speed is reduced when the real-time data of the thickness of the tail of the steel plate measured by the thickness gauge 206 does not exceed 10% of the set data of the thickness before rolling, and the third rolling is finished when the rolling mill is stopped, the length needs to be calculated by an encoder 5 positioned on a guide roll, and the thickness is calculated by the thickness gauge 206 positioned on the right side of the working roll 109;

fifthly, running and starting fourth pass rolling, wherein the fourth pass rolling is the same as the second pass rolling;

and sixthly, starting the fifth pass of rolling, wherein the fifth pass of rolling is the same as the third pass of rolling, and the like.

Specifically, the winding length calculation formula (1) C ═ pi d; (2) l ═ C/P × P0. In the above formula, C is the circumference, d is the diameter (the diameter of a measuring wheel installed on an encoder), pi is the circumference ratio, P is the number of pulses per circle of the encoder (1000P/R), P0 is the real-time accumulated pulses output by the encoder, and L is the winding length (real-time dynamic value). The diameters of the guide roller and the plate-shaped roller 207 are respectively used as the diameters of the measuring wheels, so that the precision is high and the error is small. It does not expand like a mandrel (inlet tension roller 105 and outlet tension roller 111 expand around the steel sheet).

The above-mentioned calculation formula of the set length is: 1/2a (V2-V02)

Wherein: s is a set length

V is the current speed (when the rolling is stable, the production line is started and accelerated, and the speed is maintained when the rolling is accelerated to a certain speed, V is a certain speed)

V0＝50m/min

a is 40m/min/s (reduction ratio, i.e. 40m/min per second)

Specifically, the head of the steel coil is defined as the end of the steel coil near the outlet tension roller 111 in fig. 2, and the tail of the steel coil is defined as the end of the steel coil near the inlet tension roller 105 in fig. 2, and the left and right sides are based on fig. 2.

Specifically, in the third pass, when the length of the head rolling line of the steel coil plate from the working roll of the rolling mill reaches the set length, set data of the plate thickness to be rolled by the target is compared with real-time data obtained from the thickness gauge 206, the speed is reduced to 50m/min when the real-time data of the thickness of the tail of the steel plate measured by the thickness gauge 206 does not exceed 10% of the set data of the thickness before rolling, the standing-horse is stopped for 2 seconds (the standing-horse is stopped for 2 seconds when the time delay of 2 seconds is 2 seconds) when the real-time data of the thickness of the tail of the steel plate measured by the thickness gauge 206 exceeds 10% of the set data of the thickness before rolling), and the data of the plate thickness is compared when the second pass rolling starts to reach the set length, so that the speed of the rolling mill is controlled.

The first pass of rolling is just the movement of the plate tail of the steel coil to the plate head of the steel coil, the second pass of rolling is just the movement of the plate head of the steel coil to the plate tail of the steel coil, the third pass of rolling is just the movement of the plate tail of the steel coil to the plate head of the steel coil, the fourth pass of rolling is just the movement of the plate head of the steel coil to the plate tail of the steel coil, and the rest is done in sequence.

The reduction rate of each pass of rolling is 20-30%, and the thickness gauge 206 detects that the thickness is thicker than 10%, which indicates that the position of the steel plate on the 206 thickness gauge is thicker, and indicates that the steel plate is close to the corresponding rolling line.

Specifically, the thickness gauge 206 is spaced from the centerline of the work roll 109 by 1.9 meters, and the guide roll is spaced from the centerline of the work roll 109 by 2.5 meters.

Particularly, the utility model discloses a principle is that the long rolling line length of board tail rolling line and the long rolling line length of board of ability real-time supervision steel sheet can realize making the timely automatic deceleration of rolling mill to parking under the condition of controllable board tail or board head length, avoids the steel band to surpass because of board tail or board head length, effectively saves manufacturing cost, improves the lumber recovery.

On the basis of the above solution, if various changes or modifications of the present invention do not depart from the spirit and scope of the present invention, if they fall within the scope of the claims and the equivalent technology of the present invention, then the present invention is also intended to include these changes and modifications.

Claims (8)

1. The utility model provides a control system that rolling mill shut down, includes rolling mill control unit (1), main control unit (2), thick control module (3) and industrial control computer (6), and the export of rolling mill worker's roller all is equipped with calibrator (206), its characterized in that with the entry: the plate thickness control device is characterized by further comprising an encoder (5) used for detecting the length of a rolled plate, the plate thickness control module (3) is respectively connected with the encoder (5) and a thickness gauge (206), the plate thickness control module (3) and an industrial control computer (6) are mutually connected and interact data, the plate thickness control module (3) compares set data of the plate thickness to be rolled by a target when the length of a rolling mill working roll from a plate tail rolling line reaches the set length with real-time data obtained from the thickness gauge (206) so as to send a speed reduction or delay stop command to the rolling mill, and the main control unit (2) is respectively connected with the plate thickness control module (3) and the rolling mill control unit (1) and receives the command of the plate thickness control module (3).

2. A mill shutdown control system as claimed in claim 1, wherein: the rolling mill control unit (1) comprises a frequency converter (4) and a motor (7), the frequency converter (4) is connected with the motor (7), and the main control unit (2) is connected with the frequency converter (4).

3. A mill shutdown control system as claimed in claim 1, wherein: the encoders (5) are respectively arranged on the guide roller and the plate-shaped roller (207).

4. A mill shutdown control system as claimed in claim 1, wherein: the encoder (5) is an ohm dragon high-precision encoder.

5. A mill shutdown control system as claimed in claim 1, wherein: the thickness gauge (206) is an X-ray thickness gauge.

6. A mill shutdown control system as claimed in claim 1, wherein: the plate thickness control module (3) stores plate thickness setting data, and can compare the plate thickness setting data to be rolled with real-time data obtained from a thickness gauge (206), thereby outputting a speed reduction or delay stop command to the rolling mill.

7. A mill shutdown control system as claimed in claim 1, wherein: the plate thickness control module (3) realizes the functions through a plate thickness PLC.

8. A mill shutdown control system as claimed in claim 1, wherein: and the thickness gauge (206) measures that the real-time data of the thickness of the tail of the steel plate exceeds 10% of the set data of the thickness before rolling, and the machine is stopped with delay of two seconds.

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