CN104923567B - Method for identifying and monitoring slippage of engagement of strip head into frame during finish rolling of hot rolled strip - Google Patents
Method for identifying and monitoring slippage of engagement of strip head into frame during finish rolling of hot rolled strip Download PDFInfo
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- CN104923567B CN104923567B CN201410097913.XA CN201410097913A CN104923567B CN 104923567 B CN104923567 B CN 104923567B CN 201410097913 A CN201410097913 A CN 201410097913A CN 104923567 B CN104923567 B CN 104923567B
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- strip
- strip steel
- finish rolling
- pinch roll
- skidding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B33/00—Safety devices not otherwise provided for; Breaker blocks; Devices for freeing jammed rolls for handling cobbles; Overload safety devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The invention provides a method for identifying and monitoring the slippage of the engagement of a strip head into a frame during the finish rolling of a hot rolled strip. The method is implemented by a computer real-time monitoring system and includes determining the strip position by means of electrical tracking signals to make the strip head reach to a first finish rolling frame; determining the flying shear slippage; determining the slippage if the running speed of a pinch roll contacted with the strip is zero, and then stopping the strip; and determining based on the pinch roll speed change condition and continuous time: the strip normally runs if the running speed of the strip in the pinch roll is between an upper limit value and a lower limit value, slippage occurs if the strip running speed is lower than the normally set lower limit value, and the computer system performs alarm display when the slippage continuous time exceeds the tolerable threshold value. The computer system gives a determination on the slippage, calculates the slippage time in real time, outputs alarm information, automatically stops steel feeding when a condition is satisfied, and prevents the accident extension.
Description
Technical field
The present invention relates to a kind of hot-strip monitoring method when finish rolling, in particular relate to a kind of hot-strip
During finish rolling strip steel head nip frame skid identification and monitoring method.
Background technology
As it is shown in figure 1, the layout of existing hot rolling line includes: walking beam furnace 1, roughing mills 2,
Optimization cutting system 3, four link type flying shear 4, De-scaling box 5, finish rolling tandem mill 6, section cooling equipment 7,
Coiling machine 8；Corresponding hot rolling technology flow process substantially has heating, roughing, finish rolling, the operation such as batches.First
According to rolling scaduled, plate slab 50 ' is loaded walking beam furnace 1 according to order.Slab 50 ' is heated to work
After the target temperature that skill specifies, it is transported to roughing mills 2.Roughing mills is by the slab of 200-250mm
50 ' rollings are the intermediate blank 50 of 38-60mm " after, enter finishing mill by the measurement of optimization cutting system 3
Group 6.First pass through four link type flying shear 4 before this and excise its irregularities end to end, subsequently into De-scaling box
5 carry out de-scaling, then the finish rolling tandem mill 6 formed through F1 to F7 frame is rolled into 1.2-25.4mm thickness
Finished strip 50.Strip steel goes out after F7 frame through section cooling equipment 7, and its temperature is cooled to the temperature of regulation
Degree, is finally admitted to coiling machine 8 and coils into coil of strip.
In iron and steel enterprise's hot rolling continuous rolling production line, strip steel through roughing rolling becoming intermediate blank 50 ', due in
Between base 50 " unqualified thickness reason, the reason such as absolute altitude is unreasonable and nose shape is bad, strip steel head is in finish rolling
First frame F1 there will be skidding of nipping.Stinging people and skidding is that bite condition can not meet, and rolled piece can not be stung smoothly
The phenomenon entered.The realization of biting, contacts the effect determined that rubbed.People's rolled piece stung by roll to be made
The horizontal component horizontal component more than normal pressure N of tangential friction force T must be made, as shown in Figure 2.The most satisfied
Condition: Tcos α～> N sin α, along with the increase of nip angle α, the horizontal component of normal pressure N increases, and rubs
The horizontal component of wiping power reduces, and the operation of rolling becomes unstable, easily occurs skidding.
The many factors of actual influence nip angle α, mainly has intermediate blank 50 " thickness, frame reduction ratio, roller
Footpath, roller surface state etc..After skidding, generally slip time is within several seconds, then
Rolled piece typically can be nipped milling train.Owing to skidding, strip steel stops before milling train, as it is shown on figure 3, in De-scaling box
Water 57 is cooled down before the de-scaling water of 2# descaling header 55 and frame in the de-scaling water of 1# descaling header 53, De-scaling box
Can make strip steel local temperature rapid drawdown formed cold spot, in the follow-up operation of rolling it may happen that rise set, draw steel,
The problems such as dimension overproof, easily cause breaking, steel scrap accident.
At present the strip steel head identification judgment mode that frame skids of nipping is by operational observations, therefore exist below
Shortcoming: degree of detection is low: skidding and be difficult to find, slip time not can determine whether；Poor reliability, is i.e. easy to send out
Raw erroneous judgement, causes intervening delayed or transition intervention；Potential risk is big: skids and is not found after steel easily
There is steel scrap.
Summary of the invention
When it is an object of the invention to provide a kind of hot-strip finish rolling strip steel head nip frame skid knowledge
Not and monitoring method, strip steel can be monitored in real time nip skidding export warning message in time, with Accident prevention.
During the hot-strip finish rolling of the present invention, strip steel head is nipped the identification and monitoring method that frame skids, and passes through
Real-time monitoring of computer system is implemented, and identification and the monitoring method of this skidding comprise the following steps:
Utilize electrically tracking signal that strip steel position is judged, to meet strip steel head arrival finish rolling the first machine
Frame；
Flying shear is skidded and judges: the pinch roll speed of service vanishing contacted with the strip is judged as skidding,
Now make strip steel out of service；
Judge according to pinch roll velocity variations situation and persistent period: the strip speed between pinch roll
Between upper lower limit value, then strip steel is properly functioning；If strip speed is less than the normal lower limit set
Then skid；Carry out reporting to the police aobvious when the persistent period of skidding exceedes the threshold value computer-chronograph system that can bear
Show.
When skidding occurs, pinch roll speed threshold value is 0～0.5m/s.
Described pinch roll speed threshold value is set as 0.25m/s.
The persistent period threshold value that skids is set as 0.1～10s.
Described skidding persistent period threshold value is set as 3s.
The method of the present invention also include by computer system output warning message after carrying out alarm indicator in terms of
Calculation machine control system carries out stopping rolling operation, to carry out subsequent treatment.
The invention has the beneficial effects as follows: the invention provides in real time monitoring strip steel and nip the method skidded, i.e. by
Computer system air exercise slides into row judgement, and calculates in real time to slip time, and exports warning message,
Being automatically stopped into steel when meeting condition, Accident prevention is magnified.Specifically, the invention have the advantages that
Reducing personnel labor intensity: have alarm screen to highlight, operation only needs primary part observation warning message；
Reliability is high: by computer monitoring and control, in addition human assistance monitoring, can avoid erroneous judgement, leakage
Sentence and intervene not in time；
Reduce risk: taking the lead skidding can effectively be detected, and system automatically controls, reduce risk and the thing of steel scrap
Therefore extension.
Accompanying drawing explanation
Fig. 1 is Band by Hot-rolling production-line arrangement schematic diagram figure；
When Fig. 2 is hot-strip finish rolling strip steel head nip frame skid schematic diagram；
Fig. 3 is that schematic diagram arranged by hot-strip finishing mill, it is shown that the situation that strip steel skids in finishing mill；
Fig. 4 is the curve chart of the velocity amplitude exception that in Fig. 3, strip steel causes when skidding in finishing mill；
When Fig. 5 is the hot-strip finish rolling of one embodiment of the invention strip steel head nip frame skid identification
Flow chart with monitoring method.
Detailed description of the invention
For the above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing to this
Bright detailed description of the invention elaborates.Firstly the need of explanation, the present invention be not limited to following specifically
Embodiment, those skilled in the art should be from the spirit that following embodiment is embodied to understand this
Bright, each technical term spirit based on the present invention can make broadest understanding.Identical or phase in figure
As component use the same reference numerals to represent.
During the hot-strip finish rolling of one embodiment of the invention, strip steel head is nipped the identification and prison that frame skids
Prosecutor method, is implemented by real-time monitoring of computer system, as it is shown in figure 5, the identification of this skidding and monitoring side
Method comprises the following steps:
Utilize electrically tracking signal that strip steel position is judged, to meet strip steel head arrival finish rolling the first machine
Frame F1；
Flying shear skidding warning function is made to start: skidding flying shear crop judges, such as the folder contacted with the strip
Sending roller speed of service vanishing to be skidding, now strip steel is out of service；
Judge according to 2# pinch roll 56 (Fig. 3) velocity variations situation and persistent period: between 2# pinch roll 56
Strip speed between bound, then strip steel is properly functioning；If strip speed is less than normal
The lower limit 0.25m/s set then skids；When skidding, the persistent period exceedes the threshold value 3S that can bear
Computer-chronograph system output warning message, to carry out alarm indicator, to realize the monitoring skidded of nipping, and leads to
Cross computer control system to carry out stopping rolling operation, carry out subsequent treatment.According to process condition, skidding is held
Continuous time gate threshold value is set as 0.1～10s.
In conjunction with each figure to nip skidding identify and monitoring process be specifically described, to become apparent from understanding this
Bright feature.
First, strip steel 56 speeds of service of 2# pinch roll after flying shear crop are set: the finish rolling of speed of service V=
First frame linear velocity V1 × slide coefficient k afterwards；2# pinch roll sets the speed of service more than 0.5m/s；
After the head of strip steel 50 is sheared system shearing, makes strip steel enter according to speed of service V set and remove
Squama case 5 (Fig. 1): as it is shown on figure 3, through 1# pinch roll 51,1# water collector 52,1# descaling header
53, water 57 and last is cooled down before 2# water collector 54,2# descaling header 55,2# pinch roll 56, frame
Strip steel head arrives the working roll entrance 58 of the first frame F1 (Fig. 1)；
The skidding next, it is determined that whether strip steel nips: as shown in Figure 4, the strip steel between 2# pinch roll 56 runs speed
Degree is between bound, then strip steel is properly functioning；If strip speed is less than the normal lower limit set
Then skid；When skidding occurs, 2# pinch roll 56 speed threshold value is 0～0.5m/s, may be set to
0.25m/s；
Carry out alarm indicator when the persistent period of skidding exceedes the threshold value computer-chronograph system that can bear, and lead to
Cross computer control system to carry out stopping rolling operation, carry out subsequent treatment；The persistent period threshold value that skids sets
It is set to 0.1～10s, may be set to 3s.
The principle of the inventive method further explained below and details.
1, slip Analysis
First having to judge strip steel position, strip steel head to be met arrives F1, utilizes and electrically follows the tracks of letter
Number realize.
Secondly, skidding flying shear and judge, when strip steel skids, strip steel is out of service, now contacts with the strip
Pinch roll speed of service vanishing, this is the essential difference run with normal strip steel, rely on this point permissible
Judge whether skidding.
Again, the persistent period of skidding be judged, owing to strip steel head with roll friction but is not nipped,
Now roll-force is the least compared with when normally nipping, and according to size and the persistent period of roll-force, can fight each other
The sliding time judges.Judge also dependent on the persistent period that pinch roll speed is zero.
2, nip skid monitoring method
Control principle:
2# pinch roll speed can set according to certain speed after flying shear crop, and setting principle is:
Strip steel is according to speed of service V=finish rolling the first frame linear velocity V1 × slide coefficient k afterwards set；
2# pinch roll setting speed all can be more than 0.5m/s under normal circumstances.Owing to having between pinch roll and strip steel
Certain pressure exists, if occurring strip steel to skid, 2# pinch roll speed can be caused after strip steel is out of service to become
Change.
Refer to Fig. 3, after the head of strip steel 50 is sheared, strip steel enters according to speed of service V set and removes
Squama case, successively through 1# pinch roll 51,1# water collector 52,1# descaling header 53,2# water collector 54,
Water 57 is cooled down before 2# descaling header 55,2# pinch roll 56, frame.Last strip steel head arrives the first frame
F1 working roll entrance 58.
Refer to Fig. 4, when strip steel normally produces, strip speed is between upper lower limit value, if strip steel
Skid, 2# pinch roll blocked rotation, the speed of service can decline to a great extent, and less than the normal lower limit set
Value.
So, the velocity perturbation to 2# pinch roll is monitored, it is possible to realize the automatic identification of skidding.
Analyzing with practical conditions, when skidding occurs, 2# pinch roll velocity variations can reach below 0.5m/s.Cause
This can judge whether skidding by the abnormal speed situation of pinch roll.Continue simultaneously for skidding
Time is shorter, and this block strip steel Local cooling time is short, is not enough to impact product quality and stability,
Can continue to produce.But according to practical experience, if the persistent period of skidding reaches more than 3s, can cause serious
Impact, so carrying out alarm indicator, and by meter when the persistent period of skidding exceedes the threshold value that can bear
Calculation machine control system carries out stopping rolling operation.
Decision logic:
Following condition occurs i.e. to be judged as that frame is skidded simultaneously.Concrete threshold value can produce the equipment of line according to difference
It is set with process characteristic.
After being judged as skidding, computer system carries out alarm indicator, and is automatically stopped into steel, operation carry out
Subsequent treatment.
Hereinafter a concrete application example is illustrated.
The identification of the hot continuous rolling skidding of the present invention and monitoring method, produce at hot rolling mill 2050 and implement, specifically on line
Parameter is as follows:
The invention provides in real time monitoring strip steel to nip the method skidded, i.e. slided into row by computer system air exercise
Judge, and calculate in real time to slip time, and export warning message, be automatically stopped when meeting condition
Entering steel, Accident prevention is magnified.Specifically, the invention have the advantages that
Reducing personnel labor intensity: have alarm screen to highlight, operation only needs primary part observation warning message；
Reliability is high: by computer monitoring and control, in addition human assistance monitoring, can avoid erroneous judgement, leakage
Sentence and intervene not in time；
Reduce risk: taking the lead skidding can effectively be detected, and system automatically controls, reduce risk and the thing of steel scrap
Therefore extension.
The present invention by computer system automatic decision, monitor and control, solve manual monitoring labor intensity high,
Poor reliability and erroneous judgement are failed to judge etc. not enough, reduce steel scrap risk, effectively raise the production of hot-strip
Stability.All there is Similar Problems owing to hot continuous rolling produces line, therefore the present patent application technology can be at steel industry
Hot continuous rolling produces and comes into operation on line, has the biggest application and popularization value.
Should be understood that after the above-mentioned teachings having read the present invention, those skilled in the art can be to this
Invention makes various changes or modifications, and these equivalent form of values fall within the application appended claims equally and limited
Scope.
Claims (6)
1. during hot-strip finish rolling strip steel head nip frame skid identification and a monitoring method, by meter
Calculation machine real-time monitoring system is implemented, it is characterised in that identification and the monitoring method of this skidding comprise the following steps:
Utilize electrically tracking signal that strip steel position is judged, to meet strip steel head arrival finish rolling the first machine
Frame；
Flying shear is skidded and judges: the pinch roll speed of service vanishing contacted with the strip is judged as skidding,
Now make strip steel out of service；
Judge according to pinch roll velocity variations situation and persistent period: the strip speed between pinch roll
Between upper lower limit value, then strip steel is properly functioning；If strip speed is less than the normal lower limit set
Then skid；Carry out reporting to the police aobvious when the persistent period of skidding exceedes the threshold value computer-chronograph system that can bear
Show.
During hot-strip finish rolling the most according to claim 1 strip steel head nip frame skid identification and
Monitoring method, it is characterised in that when skidding occurs, pinch roll speed threshold value is 0～0.5m/s.
During hot-strip finish rolling the most according to claim 2 strip steel head nip frame skid identification and
Monitoring method, it is characterised in that described pinch roll speed threshold value is set as 0.25m/s.
During hot-strip finish rolling the most according to claim 1 strip steel head nip frame skid identification and
Monitoring method, it is characterised in that the persistent period threshold value that skids is set as 0.1～10s.
During hot-strip finish rolling the most according to claim 4 strip steel head nip frame skid identification and
Monitoring method, it is characterised in that described skidding persistent period threshold value is set as 3s.
During hot-strip finish rolling the most according to claim 1 strip steel head nip frame skid identification and
Monitoring method, it is characterised in that also include by computer system output warning message to carry out alarm indicator
Rear computer control system carries out stopping rolling operation, to carry out subsequent treatment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410097913.XA CN104923567B (en) | 2014-03-17 | 2014-03-17 | Method for identifying and monitoring slippage of engagement of strip head into frame during finish rolling of hot rolled strip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410097913.XA CN104923567B (en) | 2014-03-17 | 2014-03-17 | Method for identifying and monitoring slippage of engagement of strip head into frame during finish rolling of hot rolled strip |
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| CN104923567A CN104923567A (en) | 2015-09-23 |
| CN104923567B true CN104923567B (en) | 2017-01-11 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107020299B (en) * | 2016-01-29 | 2019-05-28 | 宝山钢铁股份有限公司 | A kind of tail portion lamination identification monitoring method of hot rolling coiler |
| CN106077082B (en) * | 2016-06-21 | 2018-08-24 | 江苏永钢集团有限公司 | Reinforcing bar skids cataclasm judgment method on a kind of high-speed rod |
| CN106077805A (en) * | 2016-07-27 | 2016-11-09 | 山西太钢不锈钢股份有限公司 | Hot continuous rolling is for the control method of strip steel flying shear head shear rate |
| CN108838212B (en) * | 2018-06-29 | 2020-12-15 | 首钢京唐钢铁联合有限责任公司 | Control method of hot rolling roughing mill |
| CN109092906B (en) * | 2018-11-08 | 2019-11-05 | 东北大学 | A kind of on-line tuning method of five Stands Cold Tandem Mills group slipping phenomenon |
| CN109967532B (en) * | 2019-03-25 | 2021-09-14 | 山东钢铁股份有限公司 | Method for preventing hot-rolled strip finishing mill group from slipping |
| CN113492154B (en) * | 2020-03-20 | 2022-10-21 | 宝山钢铁股份有限公司 | Hot rolling flying shear shearing control method based on multi-speed detection compensation |
| CN113798928B (en) * | 2020-06-16 | 2023-01-20 | 上海梅山钢铁股份有限公司 | Working roller grinding method for preventing four-roller roughing mill from slipping |
| CN112872045B (en) * | 2021-01-13 | 2022-06-10 | 湖南华菱涟源钢铁有限公司 | Alarming method and device for strip steel in coiling process and electronic equipment |
| CN113042546B (en) * | 2021-02-25 | 2022-08-19 | 首钢京唐钢铁联合有限责任公司 | Method and device for tracking strip steel head |
| CN114798766B (en) * | 2022-06-08 | 2023-05-30 | 新余钢铁股份有限公司 | Fault processing method for rolling mill signal |
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| CN101271321A (en) * | 2007-03-21 | 2008-09-24 | 上海宝钢工业检测公司 | Early warning device and method for slip of strip steel tension roller units |
| CN101745552A (en) * | 2008-11-28 | 2010-06-23 | 上海宝钢工业检测公司 | Method for detecting scratch position of strip steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08309434A (en) * | 1995-05-16 | 1996-11-26 | Nippon Steel Corp | Coiling method for strip in coiling equipment |
| JP5801042B2 (en) * | 2010-10-13 | 2015-10-28 | 三菱アルミニウム株式会社 | Hot rolling method |
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|---|---|---|---|---|
| CN101271321A (en) * | 2007-03-21 | 2008-09-24 | 上海宝钢工业检测公司 | Early warning device and method for slip of strip steel tension roller units |
| CN101745552A (en) * | 2008-11-28 | 2010-06-23 | 上海宝钢工业检测公司 | Method for detecting scratch position of strip steel |
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