CN109351784A - It is a kind of to be related to the loop control method on hot-strip head - Google Patents
It is a kind of to be related to the loop control method on hot-strip head Download PDFInfo
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- CN109351784A CN109351784A CN201811299078.2A CN201811299078A CN109351784A CN 109351784 A CN109351784 A CN 109351784A CN 201811299078 A CN201811299078 A CN 201811299078A CN 109351784 A CN109351784 A CN 109351784A
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- loop
- head
- loop control
- height
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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
- B21B37/48—Tension control; Compression control
- B21B37/50—Tension control; Compression control by looper control
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- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The present invention is suitable for hot-rolling mill Control Technology of Dancer field, it provides and a kind of is related to the loop control method on hot-strip head, this method comprises the following steps: S1, controlling and receiving when stinging steel signal of downstream rack transmission in PLC, loop plays set using fixed torque；S2, after the completion of playing set, judge whether the PI height closed-loop control into head loop, if being judged as YES, looper height is adjusted in the PI height closed-loop control based on head loop；S3, after being adjusted by height of the PI height closed-loop control to loop, judge whether to need to compensate strip steel head flow, if being judged as YES, then increase the speed correction amount of upstream stand, a kind of flow-compensated control function of thermometal is added in control method, the loss of head flow is compensated in time by quickly adjusting loop length, can be effectively improved the drawing down of generation of the hot rolled strip head in finishing mill crossing process and the problem of rolling brokenly.
Description
Technical field
The invention belongs to hot rolling mill loopers control technology field, provides and a kind of be related to the tower-loop control side on hot-strip head
Method.
Background technique
During hot strip rolling, loop plays an important role to the formation of continuous rolling relationship and stabilization.In the operation of rolling,
Although looper height control is not completed by looper itself, but the speed by adjusting forebay and rear frame main transmission
What degree was realized, looper itself only provides tension for strip, but the control of loop back roll lifted and contact strip is by living
What set control was completed itself.
Hot-tandem unit generally has 7 racks, 6 loopers, which loop corresponds to which rack i.e. 4# loop
Corresponding 4# rack, which is then 5# rack.In the production process of continuous hot-rolling mill, how strip steel head to be allowed to exist
Stablizing threading in 7 rack finishing mills is that hot rolling produces the technical problem faced.Usual strip steel head meeting in crossing process
There is following problem: end narrowing, sideslip and rolling brokenly, causes the influence factor of these consequences very much, but most direct shadow
Sound is the destruction of the second flow balance between rack, shows strip rising for crossing process between milling train and covers and draw steel phenomenon, most often
What is seen is the long range drawing down of strip steel head, and when the flow deviation of rack is more than a certain range, or even steel scrap occurs.
Summary of the invention
The embodiment of the present invention provide it is a kind of be related to the loop control method on hot-strip head, to the set amount of strip steel head and
Tension is accurately controlled, and can be effectively improved the drawing down of generation of the hot rolled strip head in finishing mill crossing process and be rolled brokenly and ask
Topic.
The invention is realized in this way a kind of be related to the loop control method on hot-strip head, this method includes as follows
Step:
S1, when stinging steel signal of downstream rack transmission is controlled and received in PLC, loop plays set using fixed torque；
S2, after the completion of playing set, judge whether that the PI height closed-loop control into head loop is based on if being judged as YES
Looper height is adjusted in the PI height closed-loop control of head loop；
S3, after being adjusted by height of the PI height closed-loop control to loop, judge whether to need to strip steel head
Flow compensates, if being judged as YES, increases the speed correction amount of upstream stand.
Further, the fixed torque is determined based on the thickness of rolling steel grade and rolling steel grade.
Further, be based on condition (1) to determine whether into head loop PI height closed-loop control, condition (1) tool
Body is as follows:
1a, loop angle change rate be less than setting change rate；
1b, hydraulic cylinder output pressure be greater than pressure preset；
1c, the set time is played more than time threshold；
If meeting condition (1) either condition, that is, enter the PI height closed-loop control for playing set in head.
Further, be based on condition (2) to determine whether into head loop PI height closed-loop control, condition (2) tool
Body is as follows:
2a, loop amount of angular deviation be greater than drift angle residual quantity preset value；
2b, loop tension departure are greater than tension residual quantity preset value；
If meeting the either condition in condition (2), increase the speed correction amount of upstream stand, to supplement strip steel head
Flow loss.
Further, if two conditions in condition (2) are not satisfied, the PI height closed-loop control based on head loop
Looper height is adjusted, the control that set is played on head is terminated.
Loop control method provided by the invention based on hot-strip head has following advantageous effects:
A kind of flow-compensated control function of thermometal is added in control method, by adjusting loop length quickly come in time
The loss for compensating head flow can be effectively improved the drawing down of generation of the hot rolled strip head in finishing mill crossing process and roll brokenly
Problem.
Detailed description of the invention
Fig. 1 is the PI height closed-loop control schematic diagram of head loop provided in an embodiment of the present invention；
Fig. 2 is the looper height control schematic diagram provided in an embodiment of the present invention that flow supplementary functions are added.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Set process is played in strip steel head threading loop, plays set power by the thickness selection loop of steel grade and rolling steel grade
A kind of flow-compensated control function of thermometal is added later in square, this function is mended in time by way of quickly adjusting loop length
The problem of repaying the loss of the flow on head, improving head steady rolling.
In embodiments of the present invention, the tower-loop control side based on hot-strip head specifically comprises the following steps:
S1, it builds the set stage: controlling and receiving when stinging steel signal of downstream rack transmission in PLC, loop uses fixed torque
Set is played, the fixed torque in the embodiment of the present invention is determined based on the thickness of rolling steel grade and rolling steel grade；
When the frame that PLC controller receives downstream machine transmission stings steel signal, loop starts head and builds set, not in contact with arriving
When strip, set is played using fixed torque.It establishes steel grade-steel grade thickness-and plays set torque parameter list, based on steel grade and roll steel grade
Thickness selects torque numerical value, different steel grades and thickness to play set torque using different.
S2, after the completion of playing set, judge whether that the PI height closed-loop control into head loop is based on if being judged as YES
Looper height is adjusted in the PI height closed-loop control of head loop；
In embodiments of the present invention, be based on condition (1) to determine whether into head loop PI height closed-loop control, item
Part (1) is specific as follows: 1a, loop angle change rate be less than setting change rate, such as set change rate value as 2.0deg/s；
1b, hydraulic cylinder output pressure be greater than pressure preset, pressure preset 55KN；1c, set time are more than time threshold, when
Between threshold value be 850ms；If meeting condition (1) either condition, that is, enter the PI height closed-loop control for playing set in head, if condition (1)
In three conditions be not satisfied, then it is abnormal to illustrate that the rolling of steel occurs, is steel scrap；
PI height control principle drawing as shown in Figure 1, loop height, that is, upstream and downstream rack metal flow equilibrium valve, be by
What set amount was adjusted, and set amount regulated value is realized by the speed correction amount Δ V of upstream stand, the speed correction amount of upstream stand
Δ V such as formula (1):
Wherein, Δ LREFTo set set amount, Δ L is actual set amount, is obtained by angular encoder survey calculation, and δ L is deviation set
Amount, the i.e. difference of actual set amount and setting set amount, s are the complex variable in transmission function, KPGain is controlled for ratio；KIFor integral
Gain is controlled, master control gain K is addedTAnd angle offset flow gain KC, KP、KI、KTAnd KCIt is empirical parameter, according to life
The debugging effect of producing line determines.
S3, after being adjusted by height of the PI height closed-loop control to loop, judge whether to need to strip steel head
Flow compensates, if being judged as YES, increases the speed correction amount of upstream stand.
Based on condition (2) to determine whether into head loop PI height closed-loop control, condition (2) is specific as follows: 2a,
The amount of angular deviation of loop is greater than drift angle residual quantity preset value；2b, loop tension departure are greater than tension residual quantity preset value；If meeting
Either condition in condition (2), then further revise the speed of upstream stand, to supplement the flow damage of strip steel head
It loses, if two conditions in condition (2) are not satisfied, looper height is carried out based on the PI height closed-loop control of head loop
It adjusts.
Head flow damages caused by the set amount that the PI of conventional height is adjusted is unable to satisfy because of reasons such as thickness setting deviations
When mistake, judges whether that flow-compensated function is added in selection by the condition (2) of setting, the looper height of flow supplementary functions is added
Control principle drawing is as shown in Figure 2.The parameter setting of condition (2) is specifically as shown in table 1:
The parameter setting table of 1 condition of table (2)
When the angular deflection residual quantity of loop is greater than 1.0 degree or loop tension greater than 2.0mpa, that is, judge use condition
When for ON, that is, the set amount for entering flow-compensated function is adjusted.In this adjusting method, following new control gain: K is addedTHFor stream
Amount compensation master gain；KPHFor flow-compensated proportional gain；KIHFor flow-compensated integral gain, then the speed of the upstream stand exported
Amendment measurement Δ V, the speed correction amount Δ V of upstream stand such as formula (2):
Wherein, KTH、KPHAnd KIHIt is empirical parameter, δ L is set amount deviation, s is complex variable in transmission function；By big
Gain increases the acceleration ratio of upstream stand, reaches compensating flowrate loss, reduces the effect for drawing steel tension.
When the angular deflection residual quantity of loop is less than or equal to drift angle residual quantity preset value or loop tension less than or equal to tension
Deviation preset value, that is, when judging use condition for OFF (highly entering stable state to control), control gain recovery to normal value, upstream
The speed correction amount Δ V of rack is then based on formula (1) and is calculated, and terminates head and plays set control, controls into middle part stable state.
Loop control method provided by the invention based on hot-strip head has following advantageous effects:
1. playing set process in strip steel head threading loop, power is covered for different steel grade specifications and rising for thickness selection loop
Square.
2. a kind of flow-compensated control function of thermometal is added in control method, by quickly adjust loop length come and
When compensate head flow loss, can be effectively improved generation of the hot rolled strip head in finishing mill crossing process drawing down and roll
Broken problem.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (5)
1. a kind of be related to the loop control method on hot-strip head, which is characterized in that described method includes following steps:
S1, when stinging steel signal of downstream rack transmission is controlled and received in PLC, loop plays set using fixed torque；
S2, after the completion of playing set, judge whether the PI height closed-loop control into head loop, if being judged as YES, be based on head
Looper height is adjusted in the PI height closed-loop control of loop；
S3, after being adjusted by height of the PI height closed-loop control to loop, judge whether to need to strip steel head flow
It compensates, if being judged as YES, increases the speed correction amount of upstream stand.
2. being related to the loop control method on hot-strip head as described in claim 1, which is characterized in that the fixed torque is
It is determined based on the thickness of rolling steel grade and rolling steel grade.
3. being related to the loop control method on hot-strip head as described in claim 1, which is characterized in that based on condition (1) come
Judge whether the PI height closed-loop control into head loop, condition (1) is specific as follows:
1a, loop angle change rate be less than setting change rate；
1b, hydraulic cylinder output pressure be greater than pressure preset；
1c, the set time is played more than time threshold；
If meeting condition (1) either condition, that is, enter the PI height closed-loop control for playing set in head.
4. being related to the loop control method on hot-strip head as described in claim 1, which is characterized in that based on condition (2) come
Judge whether the PI height closed-loop control into head loop, condition (2) is specific as follows:
2a, loop amount of angular deviation be greater than drift angle residual quantity preset value；
2b, loop tension departure are greater than tension residual quantity preset value；
If meeting the either condition in condition (2), increase the speed correction amount of upstream stand, to supplement the flow of strip steel head
Loss.
5. being related to the loop control method on hot-strip head as claimed in claim 4, which is characterized in that if in condition (2)
Two conditions are not satisfied, then looper height is adjusted in the PI height closed-loop control based on head loop, terminate head and rise
The control of set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811299078.2A CN109351784B (en) | 2018-11-02 | 2018-11-02 | Loop control method for hot-rolled strip steel head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811299078.2A CN109351784B (en) | 2018-11-02 | 2018-11-02 | Loop control method for hot-rolled strip steel head |
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| CN109351784A true CN109351784A (en) | 2019-02-19 |
| CN109351784B CN109351784B (en) | 2021-01-26 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110385344A (en) * | 2019-07-26 | 2019-10-29 | 首钢集团有限公司 | A kind of control method and device of the adaptive set amount of hot continuous rolling mill loop |
| CN110961469A (en) * | 2019-12-19 | 2020-04-07 | 北京首钢股份有限公司 | Method and device for controlling stability of strip steel head |
| CN111992588A (en) * | 2019-05-27 | 2020-11-27 | 宝山钢铁股份有限公司 | Method for controlling cold-rise of sleeve of strip steel layer |
| CN112872055A (en) * | 2020-11-26 | 2021-06-01 | 冶金自动化研究设计院 | Rod and wire loop non-dead-zone loop opening control method |
| CN113083911A (en) * | 2021-03-31 | 2021-07-09 | 北京首钢股份有限公司 | Rolling process control method |
| CN113732080A (en) * | 2021-07-23 | 2021-12-03 | 阳春新钢铁有限责任公司 | Control system and method for looping head to get big loop |
| CN113909307A (en) * | 2021-08-30 | 2022-01-11 | 北京首钢自动化信息技术有限公司 | Loop control method and device |
| CN114453432A (en) * | 2022-01-06 | 2022-05-10 | 首钢京唐钢铁联合有限责任公司 | Control method and device for strip steel finish rolling equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111992588A (en) * | 2019-05-27 | 2020-11-27 | 宝山钢铁股份有限公司 | Method for controlling cold-rise of sleeve of strip steel layer |
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| CN112872055A (en) * | 2020-11-26 | 2021-06-01 | 冶金自动化研究设计院 | Rod and wire loop non-dead-zone loop opening control method |
| CN113083911A (en) * | 2021-03-31 | 2021-07-09 | 北京首钢股份有限公司 | Rolling process control method |
| CN113083911B (en) * | 2021-03-31 | 2023-01-10 | 北京首钢股份有限公司 | Rolling process control method |
| CN113732080A (en) * | 2021-07-23 | 2021-12-03 | 阳春新钢铁有限责任公司 | Control system and method for looping head to get big loop |
| CN113909307A (en) * | 2021-08-30 | 2022-01-11 | 北京首钢自动化信息技术有限公司 | Loop control method and device |
| CN113909307B (en) * | 2021-08-30 | 2024-03-15 | 北京首钢自动化信息技术有限公司 | Loop control method and device |
| CN114453432A (en) * | 2022-01-06 | 2022-05-10 | 首钢京唐钢铁联合有限责任公司 | Control method and device for strip steel finish rolling equipment |
| CN114453432B (en) * | 2022-01-06 | 2023-12-01 | 首钢京唐钢铁联合有限责任公司 | Control method and device for strip steel finish rolling equipment |
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