CN102896184B - Load reduction control method of hot straightener during reverse pass straightening - Google Patents
Load reduction control method of hot straightener during reverse pass straightening Download PDFInfo
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- CN102896184B CN102896184B CN201110212551.0A CN201110212551A CN102896184B CN 102896184 B CN102896184 B CN 102896184B CN 201110212551 A CN201110212551 A CN 201110212551A CN 102896184 B CN102896184 B CN 102896184B
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Abstract
The invention discloses a load reduction control method of a hot straightener during reverse pass straightening and belongs to the field of metal processing. The method includes: detecting the position of a steel plate, judging by combining the steel plate pass, automatically controlling the steel plate straightening speed of the straightener according to the head position of the steel plate, decreasing the straightening speed when a nose portion of the steel plate head enters the straightener, and enabling the transmission torque curve to be quite stable when the nose portion enters the straightener. By the delay triggering scheme, impact load of the nose portion of the steel plate head on a straightener outlet roll table can be effectively controlled during reverse pass straightening, transmission equipment can be protected, and loss of enterprises due to long-time shutdown is avoided. Service life of the equipment is prolonged, and comprehensive economic benefit of the enterprises is increased beneficially. The method can be widely applied to the control field of hot straightening mechanical devices.
Description
Technical field
The invention belongs to metallic plate without machining process field, particularly relate to a kind of control method of thermal straightening machine for metallic plate aligning.
Background technology
Thermal straightening machine is one of the major process unit in Baosteel Heavy Plate Mill's portion, and after being arranged in accelerated cooling device, it adopts aximal deformation value straightening schemes to carry out thermal straightening to steel plate, be used for eliminating roll after and/or the unflatness of steel plate after accelerating cooling.
The production technology of thermal straightening machine mainly according to treating the steel grade of straightening steel plate, specification, performance and the profile of steel plate, the requirement of quality determines straightening process parameter, as:
(1) straightening temperature: straightening temperature is too high, steel plate to cold bed can regenerate again wooden dipper song and waveform; Straightening temperature is too low, and yield of steel rises, and leveling effect is bad, and after rectifying, surface of steel plate residual stress is high, reduces the performance of steel, particularly cold-bending property.
(2) align passage: aligning passage depends on the leveling effect of every a time, operator will according to steel plate profile situation, rolling cycle, length of rolled piece and finishing temperature etc. because usually determining to align passage.
(3) drafts is aligned: namely aligning drafts also crosses the amount of rectifying, and its size directly affects the diastrophic curvature value of steel plates straightening.Drafts is too small, and curvature value can not meet deformation requirements, and the residue curvature of steel plate does not drop to below setting, steel plate can not be made straight even if now increase aligning passage; If drafts is too large, though aligning passage can be reduced, the accident of end roll banding may be caused.
The 5m in Baosteel Heavy Plate Mill's portion produces line 9 roller thermal straightening machine and goes into operation existing 6 years so far.
The operation initial stage, the aligning strategy of this thermal straightening machine is that (metallic plate often passes through thermal straightening machine once to 5 passage alignings, count a straightening process/number of times, be called for short " passage " in the industry), by optimization, aligning passage is reduced to 3 passages, while improving aligning rhythm, too increases the load of straightener.
To the end of the year 2006, pipe line steel starts to produce line large-scale production at this 5m, owing to containing ACC (Accelerate Cooling Control in the production technology of pipe line steel, roll rear accelerating cooling) accelerated cooling process, steel plate arrives thermal straightening machine after finishing mill rolling and ACC cooling, and the situation of head nose is very serious and general.
For this kind of steel plate, what adopted at that time is the method for aligning of " threading pattern ", namely, before steel plate arrives straightener, operative employee, by observing steel plate template, estimates the height of nose part, thus straightener roll gap is manually lifted (be generally 250mm to 300mm in advance, and thickness of slab is generally below 20mm), pass after straightener until steel plate head, then press down roll gap, steel plate latter half is aligned, until afterbody leaves straightener.When the second passage (" the anti-passage " that be namely commonly called as in the industry) and the 3rd passage aligning, more normal method for aligning is adopted to process, therefore the operating procedure when second, third passage is aligned just without " in advance straightener roll gap manually being lifted ".
The method for aligning of above-mentioned this " threading pattern ", effectively can avoid steel plate head nose seriously to the impact of straightener inlet roller-way and drive apparatus; But when the anti-passage aligning of steel plate, owing to being the normal method for aligning of employing, aligning speed reaches 1.8m/s, and higher aligning speed still can make steel plate head nose part when entering straightener, causes great impact to straightener outlet roller-way and drive apparatus.
The adverse effect that above-mentioned this method for aligning brings mainly contains:
(1) roller table surface produces impression, thus makes surface of steel plate produce scuffing when aligning.
The reply treatment measures of production scene: need shut down and carry out online reconditioning to roller table surface, the reconditioning time is generally 15 minutes.
(2) top roller-way hanging bolt fatigue fracture is exported.
The reply treatment measures of production scene: change working roller of straightening machine, minimum 4 hours of replacing construction.
(3) export transmission frequency converter overcurrent and jump electricity.
The reply treatment measures of production scene: power transmission again after reset, the processing time is generally 5 minutes.
In view of the significant impact that above downtime can produce the performance of enterprises; if a kind of control method can be found; when anti-passage aligning; the impact of steel plate head nose to straightener outlet roller-way and drive apparatus is controlled; thus reduce this type of impact load; so not only protect the said equipment, also avoid the economic loss of shutting down for a long time and manufacturing enterprise being caused.
Summary of the invention
Technical problem to be solved by this invention is to provide load down control method when the anti-passage of a kind of thermal straightening machine is aligned; it is by detecting the position of steel plate; judge in conjunction with passage residing for steel plate; basis steel sheet head position controls the steel plates straightening speed of straightener automatically; effectively can control steel plate head nose part when anti-passage is aligned and straightener be exported to the impact load of roller-way; do not affect original rhythm of production again; on the output/efficiency of existing equipment substantially without impact, contribute to protection drive apparatus and extension device service life.
Technical scheme of the present invention is: load down control method when providing the anti-passage of a kind of thermal straightening machine to align, comprise the straightening parameters setting that thermal straightening machine PLC control system accepts upper central control system, every operating parameter setting of straightener is performed by setting value, capture setting is in the output signal of 4 gratings at thermal straightening machine two ends, the position of steel plate is judged according to its signal condition, according to the position relationship of steel plate and thermal straightening machine, control the aligning speed of thermal straightening machine, and the measured value after aligning is uploaded to upper central control system, it is characterized in that:
A, employing normal process flow carry out the 1st passage aligning treating straightening steel plate, and upload the 1st passage aligning measured value;
After B, the 1st passage aligning terminate, aligning road number of times adds 1, detects 1# ~ the 4# grating and whether is in state of activation;
If C only 4# grating is in state of activation, then carry out reception and the respective settings of the 2nd passage setting value;
Whether D, detection setting put in place, if setting puts in place, start the 2nd straightening process;
E, detect each grating and whether be in state of activation;
If F is 3#, 4# grating is all activated, starts straightener materials inside and follow the tracks of, be 0 with 3# grating, treat straightening steel plate present position and follow the trail of; Meanwhile, straightener setting speed is biting speed;
G, detect each grating and whether be in state of activation;
If H is 2#, 3#, 4# grating are all activated, then judge to treat that straightening steel plate enters straightener completely;
The setting speed of I, straightener accelerates to normal aligning speed;
J, continuation detect each grating and whether are in state of activation;
K, be in state of activation when 2#, 3# grating, when 4# grating is in OFF state, by the setting speed automatic retarding of straightener to anti-nose aligning speed;
L, again detect each grating and whether be in state of activation;
If M only 1# grating is in state of activation, when all the other gratings are OFF state, the setting speed of straightener is down to 0, and this passage aligning measured value is uploaded;
N, the 2nd passage straightening process terminate;
O, aligning road number of times add 1, then carry out the straightening process process of lower a time by normal flow.
Further, when 2#, 3# grating are in state of activation, when 4# grating is in OFF state, the setting speed of straightener is decelerated to anti-nose aligning speed by time delay.
Further, when described 2#, 3# grating are in state of activation, when 4# grating is in OFF state, and aligning road number of times is when being 2, triggers signal to reduce the speed, start the computation delay time, after reaching delay time, the setting speed of straightener is reduced to anti-nose aligning speed.
Concrete, above-mentioned delay time is:
Delay time=(9 meters/normally align speed)-lead
Wherein, 9 meters is between 1#, 2# grating or 3#, distance between 4# grating, and lead is for be down to aligning speed from normal aligning speed
headthe required time, described aligning speed
headfor anti-nose aligning speed.
Lead described in it is determined by following method:
at
2/2＝(V
2-V
1)
That is:
Wherein, a is straightener acceleration, is the device parameter of straightener; Aligning speed head is anti-nose aligning speed.
Further, described delay time to the time delay that whole straightening process produces is:
T=(1-K
anti-nose) * 5.36/ (K
anti-nose* v
aligning)
Wherein, K
anti-nosethe coefficient obtained according to the change of contrast driving torque during debugging, K
anti-nosebe 0.5, v
aligningfor normally aligning speed.
Concrete, when described 1#, 2# grating are in state of activation and activate, when 3#, 4# grating are in OFF state, then judge to treat that the nose part of straightening steel plate head enters straightener.
Further, described biting speed is normally align speed 80%.
Further, described anti-nose aligning speed is
Aligning speed
head=normal aligning speed * K
anti-nose
Wherein, 0<K
anti-nose<1,
K described in it
anti-noseobtain according to the change of contrast driving torque during debugging.
Concrete, described K
anti-nosebe 0.5.
Compared with the prior art, advantage of the present invention is:
1. the technical program is by controlling the control method of aligning speed according to the position of steel plate during anti-passage aligning, and when can effectively reduce anti-passage aligning, steel plate head nose part is to the impact load of straightener outlet roller-way;
2., before steel plate head nose part enters straightener, aligning speed lowers by this control method automatically, and when making nose part enter straightener, driving torque curve is very steady;
3. take the scheme of Time-delayed trigger, aligning rhythm can not be affected, on the output/efficiency of existing equipment substantially without impact, contribute to protection drive apparatus and extension device service life.
Accompanying drawing explanation
Fig. 1 is the arrangement schematic diagram of existing straightener and each grating thereof;
Fig. 2 is the normal straightening process schematic flow sheet of existing straightener;
Fig. 3 is the anti-passage straightening process schematic flow sheet of the technical program;
The process flow diagram of time delay reduction of speed subcycle when Fig. 4 is anti-passage aligning;
Fig. 5 is the PAD data/signal schematic representation of original straightener;
Fig. 6 is the PAD data/signal schematic representation of straightener after transformation;
Fig. 7 is the PDA data/signal schematic representation of the whole process of thermal straightening machine anti-passage aligning in embodiment.
In figure, 1 ~ 4 is 1# ~ the 4# grating, and 5 and 6 is first, second pyrometer, and 7 is steel plate logistics direction, and 8 is thermal straightening machine.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described.
In Fig. 1, in order to set forth conveniently, in this manual, with the head of the production logistics direction of steel plate definition steel plate and afterbody, in like manner, define the front-end and back-end of thermal straightening machine with the production logistics direction of steel plate, therefore left side is front end (or being called for short entrance) in the drawings, right side is rear end (or being called for short outlet).
In the front-end and back-end of existing thermal straightening machine 8, the production logistics direction 7 being respectively arranged with the first pyrometer 5,1# grating 1,2# grating 2,3# grating 3,4# grating 4 and the second pyrometer 6, figure light plate is from left to right.
The relation of actual field position between each detection part in figure: 1# grating distance straightener inlet 9 meters, 2# grating distance straightener inlet 0 meter, 3# grating distance straightener exports 0 meter, and 4# grating distance straightener exports 9 meters.
Straightening machine body length is 5.36 meters.
When positive passage (odd-times) is aligned, steel plate is from left to right by straightener, accepts straightening processing; When anti-passage (even-times) is aligned, steel plate is from right to left by straightener, accepts straightening processing, therefore has in the industry positive and negative road to take second place title.
" threading pattern " method for aligning that existing aligning production technology adopts, when the first passage, before steel plate arrives straightener, operative employee, by observing steel plate template, estimates the height of nose part, thus is manually lifted by straightener roll gap in advance, pass after straightener until steel plate head, press down roll gap again, steel plate latter half is aligned, until afterbody leaves straightener.
When the second passage (" the anti-passage " that be namely commonly called as in the industry) and the 3rd passage aligning, more normal method for aligning is adopted to process, therefore the operating procedure when second, third passage is aligned just without " in advance straightener roll gap manually being lifted ".
The method for aligning of above-mentioned this " threading pattern ", effectively can avoid steel plate head nose seriously to the impact of straightener inlet roller-way and drive apparatus; But when the anti-passage aligning of steel plate, owing to being the normal method for aligning of employing, aligning speed reaches 1.8m/s, and higher aligning speed still can make steel plate head nose part when entering straightener, causes great impact to straightener outlet roller-way and drive apparatus.
According to on-the-spot PAD (Process Data Acquisition, process data acquisition system) measured data analysis, torque peak at that time can reach about 5000Nm, causes very large impact to straightener outlet roller-way and drive apparatus.
In Fig. 2, when adopting present " threading pattern " method for aligning to start to align, first thermal straightening machine PLC control system initializes, when detecting that the first high temperature (is commonly called as in respect of during output signal and is activated, lower same), illustrate and treat strong steel plate setting in motion from left to right, prepare to enter thermal straightening machine.
Thermal straightening machine PLC control system superior central control system sends request, receives aligning model setting value, and performs every operating parameter setting of straightener by setting value.
When 1# grating is activated, illustrates and treat that strong steel plate has entered the working range of thermal straightening machine, straightener starts to carry out straightening process step.
When 1#, 2# grating are all activated, start straightener materials inside and follow the tracks of, be 0 position with 2# grating, material present position is followed the tracks of; It is biting speed (biting speed is normally align speed 80%) by the Speed Setting of straightener simultaneously.
When 1#, 2#, 3# grating be activated or 2#, 3# grating be activated (for until the shorter situation of strong plate size) time, judge that steel plate is in straightener inside completely, now the setting speed of straightener be promoted to normal aligning speed.
When only having 4# grating to be activated, illustrate that steel plate leaves straightener completely, then this straightening process terminates, and the speed of straightener is down to 0; The measured value of this straightening process is uploaded, waits for the straightening parameters setting of lower a time.
Above-mentioned this straightening process, because aligning speed is a steady state value, the tilting (nose be namely commonly called as) treating strong steel plate tail can be caused, consequently when the anti-passage aligning of steel plate, because aligning speed reaches 1.8m/s, higher aligning speed can make steel plate head nose part when entering straightener, causes great impact to straightener outlet roller-way and drive apparatus.
Fig. 3 is the anti-passage straightening process schematic flow sheet of the technical program.
The mentality of designing of this straightening process flow process/control method, based on meeting following 2 requirements:
1, validity.When new control method will guarantee to effectively reduce anti-passage aligning, steel plate head nose part is to the impact load of straightener outlet roller-way, and measurement index is the actual torque that outlet roller-way frequency converter is uploaded.
2, rhythm of production is not affected.Because slab portion 5m product line is that Stand Mill is produced, rhythm of production is very fast, and new control method can not affect original rhythm of production, reduces output.
As shown in the figure, the first half of the anti-passage straightening process of the technical program is substantially identical with normal straightening process, its difference is when steel plate head nose part reverse (namely in Fig. 1 from right to left) enters straightener, automatically aligning speed is lowered, now the speed of straightener is biting speed, after oppositely entering straightener completely until strong steel plate, straightener accelerates to normal aligning speed, when 4# grating is in OFF state, 2#, when 3# grating is in state of activation, the setting speed of straightener is down to anti-nose aligning speed, until 1# grating is activated, when all the other gratings are all in OFF state, judge that steel plate shifts out straightener completely, this passage straightening process terminates.
In Fig. 4, further, in the technical process shown in Fig. 3, when 2#, 3# grating are in state of activation, when 4# grating is in OFF state, and when aligning road number of times is 2, trigger signal to reduce the speed, start the computation delay time, after reaching delay time, the setting speed of straightener is reduced to anti-nose aligning speed.
Concrete, above-mentioned delay time is:
Delay time=(9 meters/normally align speed)-lead
Wherein, 9 meters is between 1#, 2# grating or 3#, distance between 4# grating, and lead is for be down to aligning speed from normal aligning speed
headthe required time.
Above-mentioned lead is determined by following method:
at
2/2＝(V
2-V
1)
That is:
Wherein, a is straightener acceleration, is the device parameter of straightener; Aligning speed
headfor anti-nose aligning speed.
Further, above-mentioned delay time to the time delay that whole straightening process produces is:
T=(1-K
anti-nose) * 5.36/ (K
anti-nose* v
aligning)
Wherein, K
anti-nosebe 0.5, v
aligningfor normally aligning speed.
Concrete, when described 1#, 2# grating are in state of activation and activate, when 3#, 4# grating are in OFF state, then judge to treat that the nose part of straightening steel plate head enters straightener.
Further, described biting speed is normally align speed 80%.
Further, described anti-nose aligning speed is:
Aligning speed
head=normal aligning speed * K
anti-nose
Wherein, 0<K
anti-nose<1,
K described in it
anti-noseobtain according to the change of contrast driving torque during debugging.
Concrete, described K
anti-nosebe 0.5.
Due to " how arranging trigger condition in PLC control device " and " how arranging delay function module in its control program ", all can find detailed description of the invention in it programmes handbook or description, and the PLC control device of different manufacturer, its special programmable device is all had to supply as random annex, therefore on existing apparatus, how to realize above-mentioned Time-delayed trigger and the method for carrying out time delay, no longer describe at this.
In other words, in the technical program, when straightener starts anti-passage aligning, for steel plate tail still by normal aligning flow process aligning, namely after the second passage has set, steel plate tail has entered straightener with biting speed, when afterbody goes out straightener, namely, when 2# grating activates, straightener speed accelerates to normal aligning speed.Be activate from 2# grating, 3# grating with former control logic difference, the moment that 4# grating extinguishes simultaneously rises, and after time delay a period of time, automatically aligning speed is reduced to anti-nose aligning speed, namely
Aligning speed
head=normal aligning speed * K
anti-nose
Wherein, 0<K
anti-nose<1
K
anti-noseobtain according to the change of contrast driving torque during debugging.
Wherein, delay function is the distance because of there being 9 meters between 3# grating and 4# grating, for when reducing anti-nose, speed of aligning reduces the negative effect to aligning rhythm brought, triggers the method for the technical program to this segment distance after taking time delay.
Straightener given by Fig. 5 improves shown in the PDA data of front original technique, in figure alphabetical A place (time shaft is 06:40:00 to 06:40:05), 3#, 4# grating extinguish, now treat that the head of strong steel plate enters straightener, from last group driving torque curve of its bottom, its peak-peak reaches about 5000Nm.
Visible, before the technical program is implemented, for the steel plate that head nose is serious, during the 1st passage aligning, take the method that head allowed, when anti-passage aligning, due to aligning speed, the nose part of steel plate head causes very large impact when entering straightener to straightener outlet roller-way and drive apparatus, and according to PDA data analysis, torque peak at that time reaches about 5000Nm.
Fig. 6 is the straightener PDA data after adopting the technical program, as we know from the figure, alphabetical A ' place is marked in figure, before head nose part enters straightener, aligning speed reduces to 0.8m/s (biting speed) by 1.6m/s, then at last group driving torque at mark letter b ' place, be basically stable at about 1000Nm.
After using the technical program, according to the steel plate position that Grating examinations arrives, before steel plate head nose part enters straightener, automatically aligning speed is lowered, at present, through debugging, K
anti-nose=0.5, namely normally align the half of speed.According to the on-the-spot PDA data analysis after implementing, when nose part enters straightener, driving torque curve is very steady, remains on about 1000Nm, fullys meet aforementioned invention object and expected design.
Consider the distance having 9 meters between straightener outlet 3# and 4# grating in the technical program, too early this control method of triggering can affect aligning rhythm, therefore takes the scheme of Time-delayed trigger, and the aligning time that therefore this control method is more multiplex than former control method is:
T=(1-K
anti-nose) * 5.36/ (K
anti-nose* v
aligning)
Wherein 5.36 is the fuselage entire length of straightener, works as K
anti-nosewhen=0.5,
T=5.36/v
aligning=5.36/1.8=2.98 second.
And finishing mill and thermal straightening machine distance have 125m, the speed of roller-way conveying steel plate is 5m/s, needs 25 seconds, additional 2.98 seconds can be digested completely from finishing mill to thermal straightening machine, therefore can not affect aligning rhythm, meet the aforementioned requirement that must not affect existing apparatus rhythm of production.
Embodiment:
The technical program is produced line thermal straightening machine at the 5m in the slab portion of applicant place enterprise and is implemented, and obtains good Expected Results.
Now for time straightening process of in production process, in conjunction with the data/signal schematic representation (see Fig. 7) of PDA, this control method is illustrated.
What Fig. 7 showed is the whole process that the anti-passage of thermal straightening machine is aligned, and it can be divided into 7 stages:
1. the 1st passage aligns end, and only 4# grating activates, and according to the setting of model specification value roll gap, roller, inlet/outlet roller, straightener region roller table speed becomes-1.44m/s (biting speed=normal aligning speed * 80%) from+1.8m/s;
2. 3#, 4# grating activates, and now steel plate tail enters straightener;
3. 2#, 3#, 4# grating activates, and now steel plate tail goes out straightener, and straightener setting speed rises to normal aligning speed 1.8m/s;
4. 1#, 2#, 3# grating activate, 4# grating extinguish, now the condition of signal to reduce the speed meets, start computation delay, aligning and setting speed constant;
5. time delay arrives, and aligning speed reduces to anti-nose speed, namely normally aligns speed * K
anti-nose=0.9m/s;
6. 1#, 2# grating activates, and 3#, 4# grating extinguishes, and steel plate head nose part enters straightener and aligns;
7. only 1# grating activates, and steel plate leaves straightener completely, uploads measurement actual achievement, the lower passage setting of request simultaneously.
The defining of each grating numbering in the present embodiment, steel plate head/afterbody sees above state in word relevant and describes.
Shown in Figure of description 5 ~ 7, PDA data/signal schematic representation is the sectional drawing of picture shown in existing equipment PDA device display screen, therefore the implication of result is prior art shown in the definition of its parameters and curve thereof, those skilled in the art all can understand result shown in the diagram implication of indices and curve, therefore is no longer described in further detail at this.
The technical program is when the anti-passage straightening steel plate of thermal straightening machine; checkout equipment and the control technology of straightener aligning speed is controlled according to the position of steel plate head; use this manufacturing technique method; can effectively control/reduce impact load during anti-passage straightening steel plate head; not only extend service life of equipment; reach the object of protection drive apparatus, the loss that long-time/frequent shutdown also can be avoided to cause enterprise, contribute to the overall economic efficiency improving enterprise.
The present invention can be widely used in the control field of thermal straightening class mechanical device.
Claims (10)
1. load down control method when the anti-passage of thermal straightening machine is aligned, comprise the straightening parameters setting that thermal straightening machine PLC control system accepts upper central control system, every operating parameter setting of straightener is performed by setting value, capture setting is in the output signal of 4 gratings at thermal straightening machine two ends, the position of steel plate is judged according to its signal condition, according to the position relationship of steel plate and thermal straightening machine, control the aligning speed of thermal straightening machine, and the measured value after aligning is uploaded to upper central control system, it is characterized in that:
A, employing normal process flow carry out the 1st passage aligning treating straightening steel plate, and upload the 1st passage aligning measured value;
After B, the 1st passage aligning terminate, aligning road number of times adds 1, detects 1# ~ the 4# grating and whether is in state of activation;
If C only 4# grating is in state of activation, then carry out reception and the respective settings of the 2nd passage setting value;
Whether D, detection setting put in place, if setting puts in place, start the 2nd straightening process;
E, detect each grating and whether be in state of activation;
If F is 3#, 4# grating is all activated, starts straightener materials inside and follow the tracks of, be 0 with 3# grating, treat straightening steel plate present position and follow the trail of; Meanwhile, straightener setting speed is biting speed;
G, detect each grating and whether be in state of activation;
If H is 2#, 3#, 4# grating are all activated, then judge to treat that straightening steel plate enters straightener completely;
The setting speed of I, straightener accelerates to normal aligning speed;
J, continuation detect each grating and whether are in state of activation;
K, be in state of activation when 2#, 3# grating, when 4# grating is in OFF state, by the setting speed automatic retarding of straightener to anti-nose aligning speed;
L, again detect each grating and whether be in state of activation;
If M only 1# grating is in state of activation, when all the other gratings are OFF state, the setting speed of straightener is down to 0, and this passage aligning measured value is uploaded;
N, the 2nd passage straightening process terminate;
O, aligning road number of times add 1, then carry out the straightening process process of lower a time by normal flow.
2. load down control method during passage aligning anti-according to thermal straightening machine according to claim 1, it is characterized in that when 2#, 3# grating are in state of activation, when 4# grating is in OFF state, the setting speed of straightener is decelerated to anti-nose aligning speed by time delay.
3. load down control method during passage aligning anti-according to thermal straightening machine according to claim 2, it is characterized in that when described 2#, 3# grating are in state of activation, when 4# grating is in OFF state, and aligning road number of times is when being 2, trigger signal to reduce the speed, start the computation delay time, after reaching delay time, the setting speed of straightener is reduced to anti-nose aligning speed.
4. load down control method during passage aligning anti-according to thermal straightening machine according to claim 3, is characterized in that described delay time is:
Delay time=(9 meters/normally align speed)-lead
Wherein, 9 meters is between 1#, 2# grating or 3#, distance between 4# grating, and lead is for be down to aligning speed from normal aligning speed
headthe required time, described aligning speed
headfor anti-nose aligning speed.
5. load down control method during passage aligning anti-according to thermal straightening machine according to claim 4, is characterized in that described lead is determined by following method:
at
2/2＝(V
2-V
1)
That is:
Wherein, a is straightener acceleration, is the device parameter of straightener; Aligning speed
headfor anti-nose aligning speed.
6. load down control method during passage aligning anti-according to thermal straightening machine according to claim 3, is characterized in that described delay time to the time delay that whole straightening process produces is:
T=(1-K
anti-nose) * 5.36/ (K
anti-nose* v
aligning)
Wherein, K
anti-nosethe coefficient obtained according to the change of contrast driving torque during debugging, K
anti-nosebe 0.5, v
aligningfor normally aligning speed.
7. load down control method during passage aligning anti-according to the thermal straightening machine described in claim 1 or 2, it is characterized in that when described 1#, 2# grating are in state of activation and activate, when 3#, 4# grating are in OFF state, then judge to treat that the nose part of straightening steel plate head enters straightener.
8. load down control method during passage aligning anti-according to thermal straightening machine according to claim 1, is characterized in that described biting speed is normally align speed 80%.
9. load down control method during passage aligning anti-according to thermal straightening machine according to claim 1, is characterized in that described anti-nose aligning speed is
Aligning speed
head=normal aligning speed * K
anti-nose
Wherein, 0<K
anti-nose<1,
K described in it
anti-noseobtain according to the change of contrast driving torque during debugging.
10. load down control method during passage aligning anti-according to thermal straightening machine according to claim 9, is characterized in that described K
anti-nosebe 0.5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110212551.0A CN102896184B (en) | 2011-07-27 | 2011-07-27 | Load reduction control method of hot straightener during reverse pass straightening |
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|---|---|---|---|
| CN201110212551.0A CN102896184B (en) | 2011-07-27 | 2011-07-27 | Load reduction control method of hot straightener during reverse pass straightening |
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| Publication Number | Publication Date |
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| CN102896184A CN102896184A (en) | 2013-01-30 |
| CN102896184B true CN102896184B (en) | 2015-03-04 |
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| CN107790504B (en) * | 2016-08-30 | 2019-08-20 | 林州凤宝管业有限公司 | Tandem mill peak clipping control method for rolling |
| CN112547841A (en) * | 2019-09-25 | 2021-03-26 | 宝山钢铁股份有限公司 | Speed control method and device for working roll of pre-straightening machine |
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