CN103817173B - A kind of straightening system and control method thereof improving steel straightener straightening capacity - Google Patents
A kind of straightening system and control method thereof improving steel straightener straightening capacity Download PDFInfo
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- CN103817173B CN103817173B CN201310752589.6A CN201310752589A CN103817173B CN 103817173 B CN103817173 B CN 103817173B CN 201310752589 A CN201310752589 A CN 201310752589A CN 103817173 B CN103817173 B CN 103817173B
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Abstract
The present invention relates to a kind of straightening system and the control method thereof that improve the straight machine straightening capacity of die steel, this control system comprises straightener, feed roller, discharge roller, control system, charging pinch roll is provided with between straightener and feed roller, discharging pinch roll is provided with between straightener and discharge roller, feed roller porch is provided with the first cold metal monitor, the second cold metal detector is provided with between feed roller and charging pinch roll, the 3rd cold metal monitor is provided with between charging pinch roll and straightener, discharging pinch rolls outlet is provided with the 4th cold metal detector, adopt and a pinch roll is respectively set before and after little H profile steel straightener, straightener charging and discharging pinch roll is made to apply certain push-and-pull stress through rolled piece to straightener roll of straightener by regulating the speed of straightener charging and discharging pinch roll, the overload problem of each smoothing roll of little H profile steel straightener is avoided with this.
Description
Technical field
The present invention relates to electrical drive control system technical field, particularly relate to the control method field of straightener straightening capacity.
Background technology
Ma Gang tri-steel rolls the large H profile steel production line of head factory and adopts overhang roll type variable pitch straightener to carry out on-line straightening to H profile steel rolled piece, this straightener has nine cantilevered smoothing rolls, and (four is upper straightening roll, five is lower smoothing roll), be staggered up and down, wherein four upper straightening rolls are that initiatively smoothing roll (is numbered 2# initiatively smoothing roll respectively, 4# is smoothing roll initiatively, 6# is smoothing roll and 8# initiatively smoothing roll initiatively), each upper straightening roll is driven through reductor by a motor (220KW) respectively, and lower smoothing roll is passive smoothing roll (is numbered the passive smoothing roll of 1# respectively, the passive smoothing roll of 3#, the passive smoothing roll of 5#, the passive smoothing roll of 7# and the passive smoothing roll of 9#), only adopt hydraulic motor power-assist.The transmission speed reducer of this large H profile steel straightener 4# active smoothing roll is in overload or heavy overload state (namely 4# active smoothing roll drive motor output torque reaches 150% motor nominal torque) in actual use often, thus, repeatedly there is the phenomenon of gear drive axle bearing and gear failure in 4# active smoothing roll reductor.
The section straightener that Ma Gang tri-steel rolls head factory little H profile steel production line is provided by Italian Da Nieli plant equipment manufacturer (DANIELI), this straightener is cantilevered ten roller straightener, 10 upper and lower interlaced arrangement of smoothing roll, below it, 5 smoothing rolls are drive roll, transmission is combined by a frequency conversion motors (400KW), and 5 smoothing rolls are non-drive driven roll above, the maximum aligning modulus of section of straightener is 220cm3.For the various H profile steel of this production line institute rolling, because modulus of section is all less than the maximum aligning modulus of section of straightener, so this straightener can complete the aligning of this production line all size kind H profile steel when nonoverload.In order to expand the rolling kind of this production line to adapt to the demand in market, at the beginning of 2012, this production line starts the such as the following corner angle of ∠ 250 × 250 × 35 specification trying to roll national grid demand.Because ∠ 250 × 250 × 18 specification modulus of section is 224.03cm3, and ∠ 250 × 250 × 35 specification modulus of section is 342.33cm3, the modulus of section of two kinds of specification angle steel is all beyond the maximum cross-section modulus of online section straightener, like this, when aligning ∠ 250 × 250 × 18 ~ ∠ 250 × 250 × 35 specification equal leg angle, the output torque of this online section straightener transmission mechanism is in overload all the time, especially when aligning ∠ 250 × 250 × 35 specification angle steel, on-line straightening owner drive motor reaches the overload of 150%, and straightener part master rectifys roll sleeve retaining mechanism frequently to be occurred damaging.It can thus be appreciated that the online section straightener of this production line does not possess the ability of aligning ∠ 250 × 250 × 18 ~ ∠ 250 × 250 × 35 specification equal leg angle.In order to make the large gauge equal leg angle of this production line institute rolling obtain stable effective aligning, Italian Danieli Off Mecc thinks that must increase one newly aligns ten larger roller straighteners of modulus of section to replace ten online roller straighteners.It is reported, the direct investment of ten roller straighteners (comprising straightener roller shell and roller sheet etc.) that a newly-increased modulus of section is larger approximately needs 2,200 ten thousand yuans, and the depreciation loss of the annex such as existing on-line straightening machine and roller shell roller sheet thereof is approximately 1,000 ten thousand yuans, and the construction of newly-increased straightener and installation need off-time of growing very much.
Summary of the invention
The present invention is directed to little H profile steel production line online section straightener aligning ∠ 250 × 250 × 18 ~ ∠ 250 × 250 × 35 specification equal leg angle time institute produced problem, the present invention have devised a kind of straightening system and the control method thereof that improve steel straightener straightening capacity, a pinch roll is respectively set before and after little H profile steel straightener, by regulating straightener charging, the speed of discharging pinch roll makes straightener charging, discharging pinch roll applies certain push-and-pull stress through rolled piece to straightener roll of straightener, avoids the overload problem of each smoothing roll of little H profile steel straightener with this.。
The technical solution adopted in the present invention is: a kind of straightening system improving section straightener straightening capacity, comprise straightener, feed roller, discharge roller, control system, charging pinch roll is provided with between straightener and feed roller, be provided with discharging pinch roll between straightener and discharge roller, be provided with the second cold metal detector between feed roller and charging pinch roll, discharging pinch rolls outlet is provided with the 4th cold metal detector.
Described control system comprises: straightener overload monitoring means, gather straightener transmission actual current, and actual current is compared with straightener permissible overload offset current sum with straightener transmission rated current, monitor straightener with this and whether be in overload; Charging pinch roll load condition monitoring means, gather into charging material pinch roll transmission actual current, and actual current is compared with charging pinch roll permissible overload offset current sum with charging pinch roll transmission rated current, monitor charging pinch roll with this and whether be in overload; Discharging pinch roll load condition monitoring means, gather discharging pinch roll transmission actual current, and actual current is compared with discharging pinch roll permissible overload offset current sum with discharging pinch roll transmission rated current, monitor charging pinch roll with this and whether be in overload; Straightener light condition monitoring means, gathers straightener transmission actual current, and with straightener transmission rated current and straightener underloading, actual current is judged that the difference of offset current is compared, monitor straightener whether be in light condition with this; Charging pinch roll reference speed correction controls switching unit, and input signal is the cold metal detector before charging pinch roll, the cold metal detector after discharging pinch roll, charging pinch roll drive failures and straightener manual manipulation mode.When cold metal detector or cold metal detector pick up and charging pinch roll transmission fault-free and straightener non-manual mode of operation time, charging pinch roll reference speed correction controls to drop into; Charging pinch roll reference speed correction control unit, receives the signal that charging pinch roll reference speed correction controls switching unit, straightener overload monitoring means, charging pinch roll load condition monitoring means and straightener light condition monitoring means.When straightener is in overload, charging pinch roll is in non-overloaded state, this control unit will increase charging pinch roll reference speed correction value gradually until straightener exits overload or charging pinch roll reference speed correction value reaches amplitude limit value; Discharging pinch roll reference speed correction controls switching unit, and input signal is the cold metal detector before charging pinch roll, the cold metal detector after discharging pinch roll, discharging pinch roll drive failures and straightener manual manipulation mode.When cold metal detector or cold metal detector pick up and discharging pinch roll transmission fault-free and straightener non-manual mode of operation time, discharging pinch roll reference speed correction controls to drop into; Discharging pinch roll reference speed correction control unit, receives the signal that discharging pinch roll reference speed correction controls switching unit, straightener overload monitoring means, discharging pinch roll load condition monitoring means and straightener light condition monitoring means.When straightener is in overload, discharging pinch roll is in non-overloaded state, this control unit will increase discharging pinch roll reference speed correction value gradually until straightener exits overload or discharging pinch roll reference speed correction value reaches amplitude limit value.
Described straightener overload monitoring means and straightener light condition monitoring means include " the overproof detection of two-way numerical value " functional block of straightener transmission actual current, and the signal that " the overproof detection of two-way numerical value " functional block exports issues " forward position time delay " functional block.
Described charging pinch roll load condition monitoring means comprises " the overproof detection of two-way numerical value " functional block of charging pinch roll transmission actual current; Described discharging pinch roll load condition monitoring means comprises " the overproof detection of two-way numerical value " functional block of discharging pinch roll transmission actual current.
The straightener permissible overload offset current of described straightener overload monitoring means setting is 10% of straightener rated current; The straightener underloading that described straightener light condition monitoring means sets judges that offset current is as 30% of straightener rated current.
A kind of control method improving the straightening system of section straightener straightening capacity, it is characterized in that, the method comprises the following steps: step one, first straightener overload monitoring means obtains the overload status information of straightener drive motor, and by obtained overload status information through forward position delay function block time delay, if described overload status information still exists after time delay, then show that straightener transmission mechanism is in stable state overload; Step 2, when straightener be in stable state overload, straightener machine charging pinch roll is in non-overloaded state, and the second cold metal detector pick up time, straightener machine charging pinch roll increases, until straightener exits overload or straightener machine charging pinch roll is in full load condition gradually to the stress that pushes away that each smoothing roll of described straightener applies; When straightener be in stable state overload, straightener machine discharging pinch roll is in non-overloaded state, and the 4th cold metal detector pick up time, straightener machine discharging pinch roll increases, until straightener exits overload or straightener machine discharging pinch roll is in full load condition gradually to the tension that each smoothing roll of described straightener applies; Step 3, when straightener be in light condition, straightener machine charging pinch roll is in full load condition, and the second cold metal detector and the 4th cold metal detector all pick up time, straightener machine charging pinch roll reduces, until straightener machine charging pinch roll drive motor exits full load condition or straightener reaches full load condition gradually to the stress that pushes away that each smoothing roll of described straightener applies; Step 4, when straightener be in light condition, straightener discharging pinch roll is in full load condition, and the second cold metal detector and the 4th cold metal detector all pick up time, straightener discharging pinch roll reduces, until straightener discharging pinch roll drive motor exits full load condition or straightener reaches full load condition gradually to the tension that each smoothing roll of described straightener applies.
The time of described forward position delay function block time delay is greater than the time of straightener raising speed.
Beneficial effect of the present invention is: for little H profile steel straightener, active smoothing roll due to this straightener adopts combination transmission, namely a drive motor drives multiple active smoothing roll, the premature beats of smoothing roll cannot be realized by the speed optimizing each initiatively smoothing roll of straightener, adopt and a pinch roll is respectively set before and after little H profile steel straightener, straightener charging pinch roll and discharging pinch roll is made to apply certain push-and-pull stress through rolled piece to straightener roll of straightener by regulating the speed of straightener charging pinch roll and discharging pinch roll, the overload problem of each smoothing roll of little H profile steel straightener is avoided with this.
Accompanying drawing explanation
Fig. 1 is the structure chart of the straightening system improving steel straightener straightening capacity.
Fig. 2 is the structure chart of the control system of the straightening system improving steel straightener straightening capacity.
Wherein, 1 aligns rolled piece for waiting, 2 is charging pinch roll, and 3 is straightener, and 4 is discharging pinch roll, and 5 is feed roller, and 6 is discharge roller, and 7 is the first cold metal detector, and 8 is the second cold metal detector, and 9 is the 3rd cold metal detector, and 10 is the 4th cold metal detector.
Detailed description of the invention
Contrast accompanying drawing below, by the description to embodiment, the specific embodiment of the present invention is as the effect of the mutual alignment between the shape of involved each component, structure, each several part and annexation, each several part and operation principle, manufacturing process and operation using method etc., be described in further detail, have more complete, accurate and deep understanding to help those skilled in the art to inventive concept of the present invention, technical scheme.
For the heavy overload problem that Ma Gang little H profile steel straightener occurs at aligning ∠ 250 × 250 × 18 ~ ∠ 250 × 250 × 35 specification equal leg angle, when keeping existing on-line straightening machine constant, a pinch roll is respectively increased in the front and back of existing section straightener, as shown in Figure 1, a kind of straightening system improving steel straightener straightening capacity, comprise straightener 3, feed roller 5, discharge roller 6, control system, charging pinch roll 2 is provided with between straightener and feed roller 5, discharging pinch roll 4 is provided with between straightener and discharge roller 6, the second cold metal detector 8 is provided with between feed roller 5 and charging pinch roll 2, discharging pinch roll 4 outlet is provided with the 4th cold metal detector 10.By regulating the speed of these two pinch rolls, making pinch roll produce push-and-pull action by rolled piece to each smoothing roll of straightener, alleviating the transmission output torque of each smoothing roll roll shaft of straightener with this, namely alleviate the output torque of straightener transmission mechanism.Adopt in this way, straightener charging pinch roll 2 and discharging pinch roll 4 also suitably can improve the bending resistance square ability of each smoothing roll while alleviating straightener each smoothing roll transmission output torque, can avoid the heavy overload problem of straightener geartrain components thus.For straightener charging pinch roll 2 and discharging pinch roll 4, no matter its structure, as long as can apply certain to push away stress or tension to rolled piece under rolled piece clamped condition.Straightener charging pinch roll 2 and discharging pinch roll 4 can adopt identical structure, and usual pinch roll is driven through reductor by adjustable frequency motor, and the size of pinch roll variable-frequency electric acc power depends on push-and-pull stress and the speed of required pinch roll.After selected good straightener charging pinch roll 2 and discharging pinch roll 4, how to utilize straightener charging pinch roll 2 and discharging pinch roll 4 to improve the straightening capacity of existing on-line straightening machine, we devise a kind of control system improving section straightener straightening capacity independently, and its Control system architecture figure as shown in Figure 2.
In fig. 2, LVM is " the overproof detection of two-way numerical value " functional block, as X >=M+HY, QU is ' 1 ', QL is ' 0 ', as M-HY < X < M+HY, QU and QL keeps ortho states, and as X≤M-HY, QU is ' 0 ' QL is ' 1 '; CTR is " bidirectional counter " functional block, IU and ID is respectively forward backward counter pulse input end, R and S is respectively reset terminal and the setting end of counter, and SV is the setting value of counter, LU and LL is respectively the bound of counter, and Y is counter output; BBF is rotary pulse generator, and pulse width is T, the pulse period is 2T; OR is OR-gate; AND is AND gate; NOT is inverter; PDE is " forward position time delay " functional block; MUL is " multiplier " functional block.The control system of this raising section straightener straightening capacity its design and control thought as follows:
This control program formed primarily of eight control units, i.e. the straightener overload monitoring means of functional block TXJJNC01 and TXJJNC02 formation, the straightener charging pinch roll 2(that functional block TXJJNC03 is formed is called for short PR1) load condition monitoring means, the straightener discharging pinch roll 4(that functional block TXJJNC04 is formed is called for short PR2) load condition monitoring means, the straightener light condition monitoring means that functional block TXJJNC05 and TXJJNC06 is formed, functional block TXJJNC07, TXJJNC08, TXJJNC10, TXJJNC12, TXJJNC14, the PR1 reference speed correction control unit that TXJJNC20 and TXJJNC22 is formed, functional block TXJJNC07, TXJJNC09, TXJJNC11, TXJJNC13, TXJJNC15, the PR2 reference speed correction control unit that TXJJNC21 and TXJJNC23 is formed, functional block TXJJNC16, the PR1 reference speed correction that TXJJNC17 and TXJJNC18 is formed controls switching unit and functional block TXJJNC16, the PR2 reference speed correction that TXJJNC17 and TXJJNC19 is formed controls switching unit.Utilize straightener charging pinch roll 2 and discharging pinch roll 4 to realize the load regulation and control of straightener transmission mechanism, to improve the straightening capacity of straightener, first this must judge whether straightener transmission mechanism is in overload.So, in this control program, be provided with straightener transmission mechanism overload monitoring means.Under automated manner, the speed control method of straightener and straightener charging pinch roll 2 and discharging pinch roll 4 is: rolled piece with low speed (i.e. threading speed) by straightener and pinch roll, when workpiece front end leaves straightener discharging pinch roll 4, straightener and charging pinch roll 2 thereof and discharging pinch roll 4 synchronous raising speed are to normally aligning speed, and when rolled piece afterbody departs from straightener discharging pinch roll 4, straightener and charging pinch roll 2 thereof and discharging pinch roll 4 are synchronously decelerated to rolled piece threading speed, wait for that next root rolled piece threading is aligned.Consider that straightener and charging pinch roll 2 and discharging pinch roll 4 thereof only had for 2 seconds usually by threading speed raising speed to time of normal aligning speed, and in the process that straightener accelerates, because the coefficient of sliding friction variation between smoothing roll and rolled piece is larger, cause straightener load torque fluctuation larger, like this, the regulation and control of dynamic load in short-term of straightener programmable logic controller (i.e. PLC) have been difficult to.So this control program does not consider the load regulation and control in the of short duration boosting velocity procedure of straightener, and the straightener transmission mechanism overload monitoring means set up in control program is only monitored the overload of straightener under stable state aligning speed.First this straightener overload monitoring means obtains the overload status information of straightener drive motor by two-way numerical value overproof measuring ability block TXJJNC01, and by this overload status information through forward position delay function block TXJJNC02 time delay 3 second (being greater than the speed up time of straightener), if this overload status information still exists after this section of time delays, then show that straightener transmission mechanism is in stable state overload.When straightener is in overload (namely straightener drive motor electric current is more than or equal to 110% motor rated current), straightener charging pinch roll 2(is called for short PR1) be in non-overloaded state (namely PR1 drive motor electric current is less than or equal to 95% motor rated current), and before PR1 heat inspection (2#CMD) pick up time, in PR1 reference speed correction control unit, the output state of ' with door ' functional block TXJJNC08 is ' 1 ', make rotary pulse generator functional block TXJJNC12 in this unit enable, at this moment, if PR1 reference speed correction controls the output of switching unit, (i.e. the output of functional block TXJJNC18) state is ' 1 ', then the counter function block TXJJNC20 of PR1 reference speed correction control unit starts forward accumulated counts, make PR1 reference speed correction value thus
increase gradually, like this, PR1 is increased, until straightener exits overload (namely straightener drive motor electric current is less than or equal to 90% motor rated current) or PR1 drive motor is in full load condition (namely PR1 drive motor electric current is more than or equal to 105% motor rated current) the stress that pushes away that each smoothing roll of straightener applies gradually by rolled piece.In like manner, when straightener is in overload, straightener discharging pinch roll 4(is called for short PR2) be in non-overloaded state, and PR2 after heat inspection (4#CMD) pick up time, in PR2 reference speed correction control unit, the output state of ' with door ' functional block TXJJNC09 is ' 1 ', make rotary pulse generator functional block TXJJNC13 in this unit enable, at this moment, if PR2 reference speed correction controls switching unit, output state is ' 1 ', then the counter function block TXJJNC21 of PR2 reference speed correction control unit starts forward accumulated counts, make PR2 reference speed correction value thus
increase gradually, like this, PR2 is increased, until straightener exits overload or PR2 drive motor is in full load condition (namely PR2 drive motor electric current is more than or equal to 105% motor rated current) the tension that each smoothing roll of straightener applies gradually by rolled piece.When straightener is in light condition (namely straightener drive motor electric current is less than or equal to 70% motor rated current), PR1 is in full load condition, and before PR1 heat inspection (2#CMD) and PR2 after heat inspection (4#CMD) all pick up time, in PR1 reference speed correction control unit, the output state of ' with door ' functional block TXJJNC10 is ' 1 ', make rotary pulse generator functional block TXJJNC14 in this unit enable, at this moment, if PR1 reference speed correction controls switching unit, output state is ' 1 ', then the counter function block TXJJNC20 of PR1 reference speed correction control unit starts reverse accumulated counts, PR1 reference speed correction value is made to reduce gradually thus, like this, PR1 is reduced the stress that pushes away that each smoothing roll of straightener applies gradually by rolled piece, until PR1 drive motor exits full load condition (namely PR1 drive motor electric current is less than or equal to 95% motor rated current) or straightener reaches full load condition (namely straightener drive motor electric current reaches 100% motor rated current).Equally, when straightener is in light condition, PR2 is in full load condition, and before PR1 heat inspection (2#CMD) and PR2 after heat inspection (4#CMD) all pick up time, in PR2 reference speed correction control unit, the output state of ' with door ' functional block TXJJNC11 is ' 1 ', make rotary pulse generator functional block TXJJNC15 in this unit enable, at this moment, if PR2 reference speed correction controls switching unit, output state is ' 1 ', then the counter function block TXJJNC21 of PR2 reference speed correction control unit starts reverse accumulated counts, PR2 reference speed correction value is made to reduce gradually thus, like this, PR2 is reduced the tension that each smoothing roll of straightener applies gradually by rolled piece, until PR2 drive motor exits full load condition (namely PR2 drive motor electric current is less than or equal to 95% motor rated current) or straightener reaches full load condition.It can thus be appreciated that, controlled by section straightener and the tensile stress between its charging pinch roll 2 and discharging pinch roll 4, the straightening capacity of section straightener can be improved.
Implementation result: Ma Gang tri-steel rolls the large H profile steel production line of head factory and adopts overhang roll type variable pitch straightener to carry out on-line straightening to H profile steel rolled piece, this straightener has nine cantilevered smoothing rolls, and (four is upper straightening roll, five is lower smoothing roll), be staggered up and down, wherein four upper straightening rolls are that initiatively smoothing roll (is numbered 2# initiatively smoothing roll respectively, 4# is smoothing roll initiatively, 6# is smoothing roll and 8# initiatively smoothing roll initiatively), each upper straightening roll is driven through reductor by a motor (220KW) respectively, and lower smoothing roll is passive smoothing roll (is numbered the passive smoothing roll of 1# respectively, the passive smoothing roll of 3#, the passive smoothing roll of 5#, the passive smoothing roll of 7# and the passive smoothing roll of 9#), only adopt hydraulic motor power-assist.The transmission speed reducer of this large H profile steel straightener 4# active smoothing roll is in overload or heavy overload state (namely 4# active smoothing roll drive motor output torque reaches 150% motor nominal torque) in actual use often, thus, repeatedly there is the phenomenon of gear drive axle bearing and gear failure in 4# active smoothing roll reductor.In view of large H profile steel aligning owner rectifys the problem existing for roller, we realize the premature beats of smoothing roll by the speed optimizing each initiatively smoothing roll of straightener, solve the overload problem of straightener roll of straightener thus.And for little H profile steel straightener, due to the initiatively smoothing roll employing combination transmission of 5, this straightener, namely a drive motor drives 5 initiatively smoothing rolls, the premature beats of smoothing roll cannot be realized by the speed optimizing straightener each active smoothing roll.In view of the overload form of little H profile steel straightener roll of straightener is substantially identical with the overload form of large H profile steel straightener roll of straightener, so, can adopt completely and a pinch roll is respectively set before and after little H profile steel straightener, by regulating the speed of pinch roll before and after straightener to make pinch roll before and after straightener apply certain push-and-pull stress through rolled piece to straightener roll of straightener, avoid the overload problem of each smoothing roll of little H profile steel straightener with this.
Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.
Claims (6)
1. one kind is improved the straightening system of steel straightener straightening capacity, comprise straightener (3), feed roller (5), discharge roller (6), it is characterized in that, this system also comprises control system, charging pinch roll (2) is provided with between straightener and feed roller (5), discharging pinch roll (4) is provided with between straightener and discharge roller (6), the second cold metal detector (8) is provided with between feed roller (5) and charging pinch roll (2), discharging pinch roll (4) outlet is provided with the 4th cold metal detector (10), described control system comprises:
Straightener overload monitoring means, gathers straightener transmission actual current, and is compared with straightener permissible overload offset current sum with straightener transmission rated current by actual current, monitor straightener whether be in overload with this;
Charging pinch roll load condition monitoring means, gather charging pinch roll (2) transmission actual current, and actual current is compared with charging pinch roll permissible overload offset current sum with charging pinch roll transmission rated current, monitor charging pinch roll (2) with this and whether be in overload;
Discharging pinch roll load condition monitoring means, gather discharging pinch roll (4) transmission actual current, and actual current is compared with charging pinch roll permissible overload offset current sum with discharging pinch roll transmission rated current, monitor discharging pinch roll (4) with this and whether be in overload;
Straightener light condition monitoring means, gathers straightener transmission actual current, and with straightener transmission rated current and straightener underloading, actual current is judged that the difference of offset current is compared, monitor straightener whether be in light condition with this;
Charging pinch roll reference speed correction controls switching unit, and input signal is the 4th cold metal detector (10), charging pinch roll (2) drive failures and straightener manual manipulation mode after front the second cold metal detector (8) of charging pinch roll (2), discharging pinch roll (4); When the second cold metal detector (8) or the 4th cold metal detector (10) examine and charging pinch roll (2) transmission fault-free and straightener non-manual mode of operation time, charging pinch roll reference speed correction controls to drop into;
Charging pinch roll reference speed correction control unit, receives the signal that charging pinch roll reference speed correction controls switching unit, straightener overload monitoring means, charging pinch roll load condition monitoring means and straightener light condition monitoring means; When straightener is in overload, charging pinch roll is in non-overloaded state, this control unit will increase charging pinch roll reference speed correction value gradually until straightener exits overload or charging pinch roll reference speed correction value reaches amplitude limit value;
Discharging pinch roll reference speed correction controls switching unit, and input signal is the 4th cold metal detector (10), discharging pinch roll (4) drive failures and straightener manual manipulation mode after front the second cold metal detector (8) of charging pinch roll (2), discharging pinch roll (4); When the second cold metal detector (8) or the 4th cold metal detector (10) examine and discharging pinch roll (4) transmission fault-free and straightener non-manual mode of operation time, discharging pinch roll reference speed correction controls to drop into;
Discharging pinch roll reference speed correction control unit, receives the signal that discharging pinch roll reference speed correction controls switching unit, straightener overload monitoring means, discharging pinch roll load condition monitoring means and straightener light condition monitoring means; When straightener is in overload, discharging pinch roll is in non-overloaded state, this control unit will increase discharging pinch roll reference speed correction value gradually until straightener exits overload or discharging pinch roll reference speed correction value reaches amplitude limit value.
2. straightening system according to claim 1, it is characterized in that: described straightener overload monitoring means and straightener light condition monitoring means include " the overproof detection of the two-way numerical value " functional block gathering straightener transmission actual current, the signal that " the overproof detection of two-way numerical value " functional block exports issues " forward position time delay " functional block.
3. straightening system according to claim 1, is characterized in that: described charging pinch roll (2) load condition monitoring means comprises " the overproof detection of two-way numerical value " functional block of charging pinch roll (2) actual current; Described discharging pinch roll (4) load condition monitoring means comprises " the overproof detection of the two-way numerical value " functional block gathering discharging pinch roll (4) actual current.
4. straightening system according to claim 1, is characterized in that: the straightener permissible overload offset current of described straightener overload monitoring means setting is 10% of straightener rated current; The straightener underloading that described straightener light condition monitoring means sets judges that offset current is as 30% of straightener rated current.
5. a kind of control method improving the straightening system of steel straightener straightening capacity according to claim 1-4 any one, it is characterized in that, the method comprises the following steps:
Step one, first straightener overload monitoring means obtains the overload status information of straightener drive motor, and by obtained overload status information through forward position delay function block time delay, if described overload status information still exists after time delay, then show that straightener transmission mechanism is in stable state overload;
Step 2, when straightener be in stable state overload, straightener discharging pinch roll (4) is in non-overloaded state, and the second cold metal detector (8) examine time, straightener discharging pinch roll (4) increases, until straightener exits overload or discharging pinch roll (4) is in full load condition gradually to the tension that each smoothing roll of described straightener applies; Step 3, when straightener be in light condition, straightener charging pinch roll (2) is in full load condition, and the second cold metal detector (8) and the 4th cold metal detector (10) all examine time, straightener charging pinch roll (2) reduces, until charging pinch roll (2) exits full load condition or straightener reaches full load condition gradually to the stress that pushes away that each smoothing roll of described straightener applies;
Step 4, when straightener be in light condition, discharging pinch roll (4) is in full load condition, and the second cold metal detector (8) and the 4th cold metal detector (10) all examine time, discharging pinch roll (4) reduces, until discharging pinch roll (4) exits full load condition or straightener reaches full load condition gradually to the tension that each smoothing roll of described straightener applies.
6. control method according to claim 5, is characterized in that: the time of described forward position delay function block time delay is greater than the time of straightener raising speed.
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| CN104148391A (en) * | 2014-07-16 | 2014-11-19 | 洛阳鼎锐材料科技有限公司 | Short-process hot tension rolling equipment and process for alloy steel pipes |
| CN105511509B (en) * | 2016-01-05 | 2018-12-25 | 内蒙古包钢钢联股份有限公司 | A kind of multi-roll straightening machine load balance control method |
| CN106694630A (en) * | 2016-12-19 | 2017-05-24 | 马钢(集团)控股有限公司 | Profile steel straightening machine and control method thereof |
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| DE3241995A1 (en) * | 1981-11-13 | 1983-05-26 | Sumitomo Metal Industries, Ltd., Osaka | METHOD FOR CORRECTING ROLLED MATERIAL |
| JP3443036B2 (en) * | 1999-05-20 | 2003-09-02 | 住友重機械工業株式会社 | Roller leveler crowning correction method and crowning device |
| CN2491150Y (en) * | 2001-07-04 | 2002-05-15 | 安泰科技股份有限公司 | Reinforcing steel straightener |
| CN1693000A (en) * | 2005-02-18 | 2005-11-09 | 中冶连铸技术工程股份有限公司 | Roller group of bending and straightening machine for band steel and said straightening machine |
| JP2012171005A (en) * | 2011-02-24 | 2012-09-10 | Jp Steel Plantech Co | Roller leveler and straightening method of metal plate |
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