CN106734238B - A kind of control method for the automatic roll change of mm finishing mill unit - Google Patents
A kind of control method for the automatic roll change of mm finishing mill unit Download PDFInfo
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- CN106734238B CN106734238B CN201710012148.0A CN201710012148A CN106734238B CN 106734238 B CN106734238 B CN 106734238B CN 201710012148 A CN201710012148 A CN 201710012148A CN 106734238 B CN106734238 B CN 106734238B
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- roll
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Classifications
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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
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
Abstract
A kind of control method for the automatic roll change of mm finishing mill unit belongs to automatic control technology field.In the case where not changing site machinery device structure, this method realizes one-touch automatic roll change, redesign roll shifting zero control technique and the pad action sequence control of upper roller system tune, independent development step pad hydraulic mechanism speed control program and roll change buggy location position program, device action speed and position control accuracy are effectively increased, the automatic roll change working efficiency of mm finishing mill unit is significantly improved.The demand of urgent roll change under the not all rack roll change occurred in produce reality and abnormality is fully considered, optimize the control technique and step sequence action for frequently resulting in that automatic roll change is interrupted in roll change flow, it reduces field device and confirms the occurrence of link and detection device cause roll change to be delayed extremely, reduce the operation difficulty and labor intensity of operative employee, greatly improve finish rolling roll change automatic control level, effectively shorten roll changing time while significantly improve 1580 continuous hot-rolling mill annual production capacities.
Description
Technical field
This method belongs to automatic control technology field, provides automatic for mm finishing mill unit in a kind of sheet band steel strip hot continuous rolling
The control method of roll change.Roll changing time and roll change failure rate are reduced while greatly improving mm finishing mill unit roll change efficiency, favorably
In raising sheet band steel strip hot rolling producing line annual output.
Background technology
In hot rolled sheet strip production process, CVC mm finishing mill units will be carried out every 2-3 hours once under normal circumstances
Work roll changing operates, and the length of roll changing time can react the advanced degree of this hot rolling line to a certain extent；And
The time length that mm finishing mill unit replaces working roll is affected to yield, and the production capacity of hot rolled sheet output strip line is
Weigh the important evidence of a national steel level.So each hot-rolled sheet strip steel production line is desirable in guarantee mechanical equipment
The replacing construction of shortening working roll under the premise of in good condition as possible reduces production cost to achieve the purpose that improve yield.
Invention content
This method is designed to provide the control that the automatic roll change of mm finishing mill unit is used in a kind of production of sheet band steel strip hot continuous rolling
Method processed is redesigned by the method for software programming in roll change flow in the case where not changing site machinery device structure
Some control techniques and step sequence action, step pad hydraulic mechanism speed control program newly developed of laying equal stress on and roll change buggy position mark
Determine program, effectively increase device action speed and position control accuracy, significantly improves the automatic roll change working efficiency of mm finishing mill unit,
Field Force's labor intensity is reduced while roll changing time and failure rate is greatly lowered, and is produced per year to improving hot rolled sheet strip
Amount helps larger.
The automatic roll change flow of the present invention is completed with two sets of control systems, is each responsible for roll change and is prepared and automatic roll change
The technology controlling and process in two stages can finally meet finish rolling region different working modes and different number rack while realize " a key
Formula " full-automatically changing flow improves finish rolling region automatization level, reduces during fast pace rolled band steel to grinding roller efficiency
It is required that.Wherein the roll change preparation stage includes：Roll shifting is zeroed, warrant stop of spindle, HGC cylinder off-loads, and milling train is cut off the water, and kink lifts and roll change
6 steps such as it is ready to complete；Automatically the roll change stage includes：New roller moves to trolley after machine side prepares position and does pumping roller preparation, finish rolling mould
Formula switches, and guide and guard scraper plate etc. moves to roll change position, and upper and lower roll system, which does, takes out roller preparation, and trolley, which is done, takes out roller and new roller time dress work, under,
Upper roller system is moved to working position, and guide and guard scraper plate etc. moves to working position, finish rolling pattern switching, and trolley moves old roller between grinding roller.Operation
Personnel carry out roll change work according to the production schedule, and clicking roll change preparation and ACK button, control system in picture will execute automatically
Roll change full-flow process walks sequence, and realizes the automatic Calibration of roll line, and entire roll change process was controlled within 17 minutes, most soon
Into 16 minutes, reach advanced international level.
Technical scheme is as follows：
1, roll shifting zero control：7 rolling mill of mm finishing mill unit was required for executing roll shifting flyback action in the roll change preparation stage, by
In the presence of mechanical frames amount, after working roll alters back to zero position, often will appear shaft end clamping plate, there are machineries to connect with working roll bearing block
Tactile phenomenon, contact generation frictional force it is excessive cause shaft end clamping plate that cannot normally execute opening action, it is subsequent to influence
Working roll takes out roller action.The roll shifting direction of the upper and lower working roll of CVC milling trains is basically unchanged in produce reality, in conjunction with reality
The condition of production redesigns roll shifting zero control technique.In the roll change preparation stage, if triggering roll shifting zero order, works at this time
Roller can alter back to zero position first, and then execution top working roll is just altering 30mm, bottom working roll is born and alters 30mm, then executes again and alters back to zero
The action of position.After increasing the above-mentioned short stroke amount of altering, the influence that milling train mechanical frames amount is zeroed to roll shifting can be completely eliminated, it can be effective
Prevent shaft end clamping plate stuck the phenomenon that can not executing opening action after roll shifting cylinder position back to zero.
2, one-touch full-automatically changing：When executing roller replacing operation, post personnel can be chosen by upper operation screen
Arbitrarily need the rack of execution roller replacing operation, selected rack that will execute the technique step sequence of roll change preparation successively in F1-F7.
Redesign chain control logic, after arbitrary rack completes roll change warming-up exercise, to rolling state and kink location status into
Row judges, if condition meets, direct triggering inlet of rolling mill, outlet guide and scraper plate is moved to the step sequence action such as roll change position, at this time
It will not be in rolling mode by milling train or roll change pattern is limited, is avoided that rolling mill hydraulic device action rate is different in this way
It walks out of the situation that existing roll change waits for occur, finish rolling region entirety roll changing time can be saved to a certain extent.
The condition satisfaction refers to that milling train is in rolling mode, and previous machine frame loop is raised under roll change preparation state
Position.
During triggering roll change warning order, after 7 rolling mills, which are fully completed roll change warming-up exercise, walks sequence, finish rolling region behaviour
Operation mode switches to roll change state by as-rolled condition automatically, does not have to post personnel and is carrying out artificial live determining and operation, normally
In the case of milling train operating mode switching will guide and guard scraper plate act during complete, such as a certain rolling mill due to detection device failure
Cause operating mode that can not switch, we design the request button for increasing and executing roller replacing operation under abnormal condition, post personnel
After scene determines that equipment state meets the switching of milling train operating mode, this button and confirmation operation are clicked, rolling mode may be implemented
The remaining step sequence that switching and milling train continue to execute automatic roll change dynamic is done.Field device confirms ring during this function can reduce roll change
The case where milling train waits for during section and rolling mode switching, and be automatically performed roll changing system control and controlled by the PAC of GE
Device is switched to the PLC controller of SIEMENS, reduces Manual operation link, shortens roll changing time.When there are some special circumstances,
Such as：Milling train piling of steel, failure, maintenance or temporary changes production order etc., when needing to carry out roller replacing operation temporarily, control system is same
Sample can be automatically performed roll change task according to when time roll change task situation.
3, roll change buggy location position：In order to shorten roll changing time, we retrofit to live roll change buggy motor, and
Redesign trolley position calibration method.Cancel the method repeatedly demarcated during original carriage walking, using only in milling train
Preceding progress roll change buggy location position.Limit switch is installed by milling train, the signal sent out when limit switch returns and roll changing carriage
Stroke engineering value is less than 200mm and just allows to trigger calibrating procedure, when roll change buggy torque is more than 73% and roll change after program triggering
Trolley physical location is less than 80mm, then it is assumed that bottom working roll has been entirely enclosed in milling train at this time, provides roll change and ceases and desist order, and will work as
Preceding bogie encoder actual value marks zero as correction value for position.The method improves the success rate of trolley Zero calibration, and
Effectively reduce the influence that zero migration controls small truck position.
4, upper roller system tune pad action sequence control：The core control portions of this method are upper roller system timing control and step pad
Speed control is first carried out in conjunction with field device situation and actual production demand in executing upper roller system tune pad action process
Machine working roller balance cylinder is retracted, and is then executed top backing up roll and is fallen action, design is after top backing up roll falls command triggers in method
It is delayed by 5S, then judges whether top backing up roll balance bar pressure value is less than 25Bar, top backing up roll balance cylinder position, which moves down, is
It is no more than 400mm, if above three decision condition is satisfied by, field device has had step pad tune filler strip completely at this time
Part, so top backing up roll lowering action will be interrupted, triggering executes step pad locking cylinder opening action；If above three judges item
Part does not meet always, and upper backup roll will execute always lowering action, and after triggering falls into place signal, control system also allows
Carry out the action of step pad tune pad.
After step pad locking cylinder is opened in place, by proportioning valve direction valve speed control program newly developed by ladder
Pad moves to setting position by current location.Mathematic interpolation is carried out to setting position and physical location first, passes through the positive and negative of difference
Relationship determines the aperture direction of proportioning valve, to influencing the mobile side of live step pad.Then to setting position and actual bit
The difference set takes absolute value, and is compared with ascending, descending speed position deviation threshold value by position deviation absolute value, when position deviation is exhausted
Ratio valve opening is opened by certain slope to amplitude limit value when being more than the threshold value of setting to value, can reach rushed in reduction machinery in this way
In the case of move the purpose of step pad rapidly；When position deviation absolute value is less than given threshold, step pad will execute deceleration
Control program, the adjusting of ratio valve opening at this time will be influenced by deviation, with deviation be multiplied by fixed proportionality coefficient come
Realize slope control when reduction of speed.The method equally can reduce it is mechanical rush also can be rapid and smooth completion thin tail sheep control.
Amplitude limit value involved in above-mentioned step pad proportional valve control program, threshold value and proportionality coefficient can according to on-site actual situations into
Row is adjusted, and can preferably meet live actual production demand, and newly-designed control program is average compared with original controls technique to be reduced
Roll changing time was at 40 seconds or more.
The threshold value is the ascending, descending speed position deviation threshold for the step pad that technical staff debugs out according to mechanical performance
Value.
The benefit of the present invention is to have fully considered under the not all rack roll change occurred in produce reality and abnormality tightly
The demand of anxious roll change optimizes and frequently results in automatic roll change interruption control technique and step sequence action, reduction scene in roll change flow
Equipment confirms the occurrence of link and detection device cause roll change to be delayed extremely, reduces operation difficulty and the labour of operative employee
Intensity greatly improves finish rolling roll change automatic control level, effectively shorten roll changing time while significantly improve 1580 hot continuous rollings
Machine annual production capacity.
Description of the drawings
Fig. 1 is one-touch automatic roll change control principle drawing.
Fig. 2 is roll change buggy location position control principle drawing.
Fig. 3 is that upper roller system tune pads action sequence control principle drawing.
Specific implementation mode
By taking the automatic roll change of finish rolling F3 racks as an example：
After operative employee's click roll change prepares and clicks ACK button, F1-F7 milling trains will execute roll change and prepare flow, work as execution
When being zeroed step sequence to roll shifting, the apc_ctrl programs of PAC plate form control devices alter back to zero position first by F3 operation roll of mill is controlled, so
Top working roll completion is just altering and is altering the action of back to zero position after 30mm afterwards, and bottom working roll will complete negative alter and alter back to zero position after 30mm and act, really
Recognize F3 to complete after above-mentioned roll shifting technique returns to zero-bit for the second time, roll shifting zero is completed, and follow-up roll change warming-up exercise is continued to execute.When
After L2, L3 kink lift signal return in place, roll changing system control temporarily will give Siemens S7-400 control at this time, use
It is moved to the sequential control of roll change position in execution F3 racks entrance, outlet guide and scraper plate, when L1-L6 kinks all lift in place
After, mm finishing mill unit operating mode will be switched to roll change state by as-rolled condition automatically, and the control of roll changing system is all handed over
It is controlled to Siemens S7-400, to complete follow-up whole roll change actions.
Guide and guard are moved to scraper plate after roll change position and Siemens Control device is obtained when time roll change whole control, and F3 milling trains will
It does upper roller system adjustment and takes out roll bar part to meet.When going to top backing up roll and falling action, as long as meeting lowering time is more than 5S
And pressure, displacement reach given threshold, stopping is fallen action by top backing up roll, is directly carried out adjusting pad action, is adjusted pad process certainly
It is dynamic to calculate setting position and current position difference, and step pad is completed according to certain lifting speed slope according to difference and modulates roll change
The control of position.Top backing up roll, which will execute, at this time rises order, since above three decision condition is added, shortens falling for backing roll
Down stroke, so support roller also shortens the time when executing vertical motion.
Up-down rollers system adjust after, roll change buggy by execute take out roller and dress roller flow, return load working roll during,
It first checks for whether limit position by milling train machine returns, then judges whether roll change buggy current location is less than 80mm, if above-mentioned
Condition is satisfied by, and will determine that whether roll change buggy current torque reaches the 73% of nominal torque, as condition all meets, then it is assumed that
Bottom working roll is installed in place, and will provide 0 speed command of roll change buggy, and zero program of trigger position mark, current trolley coding at this time
Device engineering value will participate in calculating as the correction value of Zero calibration.
Claims (2)
1. a kind of control method for the automatic roll change of mm finishing mill unit, it is characterised in that：
Step 1: roll shifting zero control：In roll change preparation stage, triggering roll shifting zero order, working roll can alter back first at this time
Zero-bit, then execution top working roll is just altering 30mm, bottom working roll is born and alters 30mm, then executes the action for altering back to zero position again；
Step 2: one-touch full-automatically changing：Chain control logic is redesigned, when arbitrary rack completes roll change warming-up exercise
Afterwards, rolling state and kink location status are judged, condition meets, and by direct triggering inlet of rolling mill, outlet guide and scrapes
Plate moves to the step sequence action of roll change position, will not be in rolling mode by milling train at this time or roll change pattern is limited；
The condition satisfaction refers to that milling train is in rolling mode, and previous machine frame loop lifts in place under roll change preparation state；
During triggering roll change warning order, after milling train, which is fully completed roll change warming-up exercise, walks sequence, finish rolling region operation mode
Automatically roll change state is switched to by as-rolled condition；
Step 3: roll change buggy location position：Limit switch is installed by milling train, when the signal that limit switch is sent out returns and changes
Roller garage journey engineering value is less than 200mm and just allows to trigger calibrating procedure, after program triggering when roll change buggy torque more than 73% and
Roll change buggy physical location is less than 80mm, then it is assumed that and bottom working roll has been entirely enclosed in milling train at this time, provides roll change and ceases and desist order, and
Current bogie encoder actual value is marked zero as correction value for position；
Step 4: the pad action sequence control of upper roller system tune：In executing upper roller system tune pad action process, top working roll is first carried out
Compensating cylinder is retracted, and is then executed top backing up roll and is fallen action, is delayed by 5S after top backing up roll falls command triggers, then sentences
Whether disconnected top backing up roll compensating cylinder pressure value is less than 25Bar, and whether top backing up roll balance cylinder position moves down more than 400mm, if
Above three decision condition is satisfied by, and will interrupt top backing up roll lowering action, and triggering executes step pad locking cylinder opening action；Such as
Fruit above three decision condition does not meet always, and upper backup roll will execute always lowering action, when triggering fall into place signal with
Afterwards, control system also allows to carry out the action of step pad tune pad；
After step pad locking cylinder is opened in place, step pad is moved to by setting position by current location by proportioning valve direction valve
It sets；Mathematic interpolation is carried out to setting position and physical location first, the aperture of proportioning valve is determined by the positive-negative relationship of difference
Direction；Then it takes absolute value to the difference of setting position and physical location, it is inclined by position deviation absolute value and ascending, descending speed position
Poor threshold value is compared, and when position deviation absolute value is more than ascending, descending speed position deviation threshold value, ratio valve opening presses certain slope
It opens to amplitude limit value；When position deviation absolute value is less than ascending, descending speed position deviation threshold value, step pad will execute control journey of slowing down
Sequence, the at this time adjusting of ratio valve opening will be influenced by deviation, be multiplied by fixed proportionality coefficient with deviation to realize drop
Slope control when fast；
The ascending, descending speed position deviation threshold value is the ascending, descending speed position deviation for the step pad for debugging out according to mechanical performance
Threshold value.
2. control method as described in claim 1, it is characterised in that：It is described during triggering roll change warning order, increase
The request button of roller replacing operation is executed under abnormal condition；A certain rolling mill causes operating mode can not due to detection device failure
Switching is clicked this button and confirmation operation, is realized after post personnel on site determines that equipment state meets the switching of milling train operating mode
Rolling mode switches and milling train continues to execute the remaining of automatic roll change and walks sequence action.
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| CN201710012148.0A CN106734238B (en) | 2017-01-08 | 2017-01-08 | A kind of control method for the automatic roll change of mm finishing mill unit |
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| CN107214198B (en) * | 2017-06-23 | 2018-11-30 | 邯钢集团邯宝钢铁有限公司 | Hot fine rolling roll change buggy position automatic Calibration control method |
| CN107745011A (en) * | 2017-10-16 | 2018-03-02 | 河钢股份有限公司承德分公司 | Roll change control method, apparatus and system |
| CN108126984A (en) * | 2017-11-30 | 2018-06-08 | 马鞍山钢铁股份有限公司 | The control method of H-Beam Rolling Mill roughing mills mill roll trolley regional location identification |
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| CN113458146B (en) * | 2020-03-31 | 2022-08-16 | 宝山钢铁股份有限公司 | Near-control operation method and operation equipment for roll changing area of hot rolling leveling line |
| CN111570531B (en) * | 2020-05-22 | 2021-03-16 | 东北大学 | Control method for online roll changing of full-continuous hot-rolling thin strip line rolling mill |
| CN111822511A (en) * | 2020-06-19 | 2020-10-27 | 南京钢铁股份有限公司 | Roll changing method of old three-roll mill |
| CN112139256B (en) * | 2020-08-28 | 2022-04-01 | 北京科技大学设计研究院有限公司 | Relative position change zero position determination method based on rolling mill pressure zero adjustment |
| CN113458147B (en) * | 2021-07-28 | 2023-03-14 | 重庆钢铁股份有限公司 | Semi-automatic roll changing control method and device |
| CN114453423A (en) * | 2022-01-12 | 2022-05-10 | 首钢京唐钢铁联合有限责任公司 | Zero position automatic calibration method and system for hot rolling roll changing trolley |
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