CN103752657A - Control system for preventing straightening roll of straightener from overload - Google Patents
Control system for preventing straightening roll of straightener from overload Download PDFInfo
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Abstract
The invention relates to a control system for preventing a straightening roll of a straightener from overload and a control method thereof. The control system comprises a straightening roll overload control switching unit. An input signal includes the automatic straightening target speed and the actual speed of the straightening roll of the straightener, the speed reducing load adjusting section of the straightening roll is determined by comparing the target speed with the actual speed, and a straightening roll overload control switching signal is generated. The system further comprises a straightening roll overload recognition and control unit. The straightening roll overload recognition and control unit receives the signal of the straightening roll overload control switching unit and enables the actual speed of the straightening roll to obtain corresponding reduction quantity by acquiring the speed reference value reducing quantity of the corresponding driving straightening roll to enable the straightening roll to quit the overload state. The control system solves the problem that the overload state of the straightening roll of the straightener cannot be controlled, the service life of a main straightening roll transmission mechanism of the straightener is prolonged, and the machine breakdown frequency is reduced.
Description
Technical field
The present invention relates to Electrified Transmission control technology field, be specifically related to the control of straightener roll of straightener overload.
Background technology
Ma Gang tri-steel roll the large H type steel production line of head factory and adopt cantilever roll-type variable pitch straightener to carry out on-line straightening to H shaped 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 active smoothing roll (being numbered respectively initiatively initiatively initiatively smoothing roll of smoothing roll and the 8th of smoothing roll, the 6th of the second active smoothing roll, the 4th), and each upper straightening roll is driven through reductor by a motor (220KW) respectively; And lower smoothing roll is passive smoothing roll (being numbered respectively the first passive smoothing roll, the 3rd passive smoothing roll, the 5th passive smoothing roll, the 7th passive smoothing roll and the 9th passive smoothing roll), only adopt hydraulic motor power-assist, this straightener roll of straightener arranges that schematic diagram is illustrated in fig. 1 shown below.The transmission speed reducer of each active smoothing roll is level Four speed change, and the structural representation of reductor is illustrated in fig. 2 shown below.
For Ma Gang great H shaped steel nine roller straighteners, according to the needs of rolled piece straightening process, its second and the 4th initiatively smoothing roll be the main roller of rectifying, the the 6th and the 8th active smoothing roll is time strong roller, the internal stresses release of rolled piece mainly completes in straightener Zhu Jiao district, and straightener Ci Jiao district has been mainly used in the smooth function of aligning rolled piece.Thus, in normal aligning process, second and the 4th the main pressure of rectifying roller to rectify amount large, especially the 4th mainly rectify roller, and that the pressure of the 6th and the 8th strong roller is rectified amount is little.In view of the pressure of section straightener primary and secondary smoothing roll, rectify amount and not only can not carry out uniform distribution according to the size of aligning load, and the strong amount of the pressure of part smoothing roll may be almost nil under some operating mode.In the situation that not aligning overload control, whether the especially main roller of rectifying of straightener roll of straightener is in overload, depend on the state of rolled piece straightening process completely, when straightener is aligned the rolled piece that intensity is high, specification is large, the master of straightener rectifys the phenomenon that roller inevitably there will be overload even seriously transship, causes aligning low and frequent breakage in the strong roller transmission mechanism of owner service life.
Ma Gang great H section straightener is when the large section profiled bar rolled piece of aligning (as: H300 × 300, BS305 × 305, H350 × 350, H400 × 400, H800 × 300 etc.), the master of straightener rectifys roller and there will be overload or the phenomenon of seriously transshipping, both at home and abroad so far also without any the control method about preventing straightener roll of straightener overload.
Summary of the invention
In order to solve the uncontrollable problem of overload of straightener roll of straightener, the invention provides a kind of control system that prevents straightener roll of straightener overload, solved the uncontrollable problem of overload of straightener roll of straightener, improved aligning owner and rectified roller transmission mechanism service life and reduce the damage frequency of equipment.
Technical scheme of the present invention is: a kind of control system that prevents straightener roll of straightener overload, comprise: smoothing roll overload is controlled switching unit, input signal is initiatively automatic flattening target velocity and its actual speed of smoothing roll of straightener second, by the contrast of target velocity and actual speed, determine the stable aligning stage of smoothing roll, and export corresponding smoothing roll overload and control enabling signal; This system also comprises the identification of smoothing roll overload and control module; The identification of smoothing roll overload gathers the actual current of the each smoothing roll of straightener with control module, and compares with rated current by each smoothing roll actual current, completes the identification of overload smoothing roll.Its corresponding rotary pulse generator of the overload smoothing roll identifying will be enabled, thus, this rotary pulse generator will be exported cycle pulse signal to control counter corresponding to this smoothing roll, make the output of this counter increase progressively a number at each control cycle, until this smoothing roll exits overload or reaches the highest amplitude limit value of counter;
The identification of smoothing roll overload and control module reception smoothing roll overload are controlled the signal of switching unit, and by the Velocity Reference value reducing amount of corresponding active smoothing roll obtaining, make the actual speed of smoothing roll obtain corresponding reducing amount, with this, make this smoothing roll exit overload.
The identification of described smoothing roll overload comprises and gathers corresponding initiatively LVM " the overproof detection of two-way numerical value " functional block, the BBF rotary pulse generator of smoothing roll actual current with control module, multiple LVM " the overproof detection of two-way numerical value " functional block parallel connection, sends to corresponding BBF rotary pulse generator one by one by signal after treatment; The specified armature supply I of input signal
nset value with electric current allowable deviation the input M and the HY that access respectively LVM " the overproof detection of two-way numerical value " functional block, the active smoothing roll actual current signal of collection accesses the input X of corresponding LVM " the overproof detection of two-way numerical value " functional block simultaneously; LVM " the overproof detection of two-way numerical value " the output QU of functional block accesses respectively the input EN of corresponding BBF rotary pulse generator, the input T that pulsewidth setting value accesses respectively BBF rotary pulse generator sends cycle pulse signal by output Q after the computing of BBF rotary pulse generator.
The described cycle pulse deration of signal is 100 milliseconds, and the cycle is 200 milliseconds.
Described smoothing roll overload sets with control module and also comprises CTR " bidirectional counter " functional block and MUL " multiplier " functional block, in this unit, many groups cycle pulse signal of many group rotary pulse generators output accesses respectively the input IU of corresponding CTR " bidirectional counter " functional block, the control signal of smoothing roll overload control switching unit accesses respectively the input R of CTR " bidirectional counter " functional block, the output Y of CTR " bidirectional counter " functional block accesses respectively the input X1 of MUL " multiplier " functional block one to one, the decrement signal of each circulation reference speed correction is input to respectively the input X2 of MUL " multiplier ", MUL " multiplier " output Y exports total reference speed correction value
control active smoothing roll one to one.
Described smoothing roll overload control switching unit comprise SUB " subtracter " functional block, NCM " numeric ratio " functional block, RSR " rest-set flip-flop that reset terminal R is preferential " functional block, PDF " after along time delay " functional block and OR ' or ' door; The initiatively automatic flattening target velocity of smoothing roll drive motor of straightener second
as input signal, be input to respectively input X1 and the X2 of SUB " subtracter " functional block with its actual speed (nact.R2), the output Y of SUB " subtracter " functional block accesses the X1 input of two groups of NCM " numeric ratio " functional block simultaneously, two group of second active smoothing roll drive motor velocity deviation fiducial value is input to respectively the X2 input of two groups of NCM " numeric ratio " functional block, the input S of output QU access RSR " rest-set flip-flop that reset terminal R the is preferential " functional block of one group of NCM " numeric ratio " functional block, the input R of output QL access RSR " rest-set flip-flop that reset terminal R the is preferential " functional block of one group of NCM " numeric ratio " functional block, the output Q of RSR " rest-set flip-flop that reset terminal R is preferential " functional block and time delayed signal be input I and the T of PDF " after along time delay " functional block respectively, the output Q access OR ' of PDF " after along time delay " functional block or ' the input I1 of door, OR ' or ' door input I2 be straightener manual manipulation mode signal input part, OR ' or ' door input I3 be the straightener control system fault-signal input, OR ' or ' door input I4 be ' 0 ' signal.
A control method that prevents straightener roll of straightener overload, the steps include:
Step 1, smoothing roll overload are controlled switching unit and are gathered the initiatively automatic flattening actual speed of smoothing roll driving motor of straightener second, and actual speed and target velocity contrast.The reference speed of considering four active smoothing roll driving motors of straightener in automatic flattening process is all identical, and acceleration and deceleration simultaneously.Like this, when the difference of the second active smoothing roll driving motor reference speed and actual speed is less than 10 revs/min, the initiatively approaching automatic flattening speed of stablizing of smoothing roll of straightener second is described, again after 500 millisecond time-delay, straightener the 4th initiatively smoothing roll also approaches and stablizes automatic flattening speed, and at this moment smoothing roll overload control switching unit input smoothing roll overload is controlled; And when the difference of the second active smoothing roll driving motor reference speed and actual speed is greater than 100 revs/min, the straightener falling-rate period after throwing steel is described, at this moment smoothing roll overload is controlled switching unit and is closed the control of smoothing roll overload;
Step 2, the identification of smoothing roll overload and control module gather the actual current of each active smoothing roll, and compare with the rated current of smoothing roll driving motor respectively, when the actual current of certain active smoothing roll is more than or equal to its rated current and electric current allowable deviation setting value sum, the identification of smoothing roll overload determines that with control module this smoothing roll is in overload; When certain is when initiatively the actual current of smoothing roll is less than or equal to the difference of its rated current and electric current allowable deviation setting value, the identification of smoothing roll overload and control module determine that this smoothing roll transships not at overload or exited overload;
Step 3, determine after the active smoothing roll of overload, smoothing roll overload sets with control module and makes the continuous reduction of speed of this active smoothing roll by output reference speed correction value, until it exits overload or has reached maximum, allows reduction of speed amount;
In described step 1, when the initiatively target velocity of smoothing roll and the difference of actual speed exceed 100, turn per minute, think the falling-rate period of straightener after aligning.
In described step 2, when actual armature current value is greater than specified armature current value 5%, this active smoothing roll is initiatively smoothing roll of overload.
In described step 3, in smoothing roll overload control procedure, the decrement of speed correction is each time made as 3 revs/min.
The active smoothing roll of overload is when reduction of speed, its upstream and downstream initiatively smoothing roll will produce push-and-pull action to it by rolled piece, make like this active smoothing roll of overload exit overload, overload active smoothing roll once exit overload, this smoothing roll stops reduction of speed, and keep the speed in this moment until rolled piece aligning is complete, for this reason, this smoothing roll overload identification adopts 4 " the overproof detection of two-way numerical value " functional block JJGC01～JJGC04 with control module; In order to prevent controlling smoothing roll actual linear velocity and rolled piece translational speed are had big difference because of smoothing roll overload, cause thus smoothing roll wear extent excessive, by limiting the counting forward higher limit of controlling relevant " bidirectional counter " functional block to each active smoothing roll overload, realize the maximal rate correction quantitative limitation that each active smoothing roll overload is controlled.
The present invention has following good effect: smoothing roll overload control switching unit can prevent this straightener roll of straightener overload control function during smoothing roll raising speed, occur miscarrying into situation, whom this smoothing roll overload control program adopts transship the control principle of whose reduction of speed and realizes the overload control of each active smoothing roll, by limiting the counting forward higher limit of controlling relevant " bidirectional counter " functional block with each active smoothing roll overload, can realize each active smoothing roll is transshipped to the maximal rate correction quantitative limitation of control.The incremental change of suitably setting speed correction each time in smoothing roll overload control procedure, can improve the speed that smoothing roll overload is controlled.
Accompanying drawing explanation
Fig. 1 Ma Gang great H section straightener smoothing roll is arranged schematic diagram;
Fig. 2 Ma Gang great H section straightener is smoothing roll speed reducer structure schematic diagram initiatively;
Fig. 3 prevents the control system structure chart of section straightener smoothing roll overload.
The specific embodiment
1-3 explanation present embodiment by reference to the accompanying drawings.In Fig. 3, LVM is " the overproof detection of two-way numerical value " functional block, and when X >=M+HY, QU is ' 1 ', and when M-HY < X < M+HY, QU keeps ortho states, and when X≤M-HY, QU is ' 0 '; SUB is " subtracter " functional block; NCM is " numeric ratio " functional block, and when X1 > X2, QU is ' 1 ', and when X1=X2, QE is ' 1 ', and when X1 < X2, QL is ' 1 '; PDF is " after along time delay " functional block; RSR is " rest-set flip-flop that reset terminal R is preferential " functional block, when S is that ' 1 ', R is while being ' 0 ', Q is that ' 1 ', QN is ' 0 ', when S is ' 1 ', when R is ' 1 ', Q is that ' 0 ', QN is ' 1 ', when S is ' 0 ', when R is ' 0 ', Q and QN keep ortho states, when S is ' 0 ', when R is ' 1 ', Q is that ' 0 ' QN is ' 1 '; OR is ' or ' door; BBF is rotary pulse generator, and pulse width is that T, pulse period are 2T; CTR is " bidirectional counter " functional block, IU and ID are respectively forward backward counter pulse input end, R and S are respectively the reset terminal of rolling counters forward value and set end, SV is the setting value of counter, LU and LL are respectively the bound of rolling counters forward value, when the count value of counter reaches higher limit, QU is ' 1 ', otherwise QU is ' 0 '; MUL is " multiplier " functional block.
This control program mainly comprises two control modules, and smoothing roll overload is controlled switching unit and the identification of smoothing roll overload and control module.Output torque when smoothing roll drive motor band carries mainly by smoothing roll with, carries acceleration moment of torsion and rolled piece aligning moment of torsion two parts form, and this two parts moment of torsion all can make smoothing roll drive motor in overload.Smoothing roll with carries acceleration moment of torsion and belongs to dynamic torque, only at smoothing roll boost phase, just there will be.In view of the needs of straightening process and equipment, straightener is in all the time in " until steel---band steel accelerates (approximately 1.2 seconds)---steady and continuous aligning (approximately 6.6 seconds)---rolled piece slows down after throwing tail---is treated steel " such On The Cycle Working Process under automated manner, it is that needs and the equipment for straightening of straightening process allows that straightener roll of straightener drive motor carries at of short duration with dynamic overload that the accelerating period occurs, this smoothing roll with carries and accelerates moment of torsion is mainly that smoothing roll transmission mechanism body accelerates needed moment of torsion, especially the acceleration moment of torsion of smoothing roll drive motor self, this part moment of torsion is the main body that smoothing roll transmission mechanism body accelerates moment of torsion, and smoothing roll transmission speed reducer structure does not transmit this part moment of torsion in boosting velocity procedure, this that is to say, even if smoothing roll drive motor carries in boosting velocity procedure in overload at with, smoothing roll transmission speed reducer also may not be in overload or serious overload, in addition, consider that this straightener roll of straightener overload control is mainly used in controlling the overload of smoothing roll mechanical transmission mechanism (being smoothing roll transmission speed reducer).So, in this straightener roll of straightener overload control program without the dynamic overload during considering the of short duration raising speed of smoothing roll.
For prevent this straightener roll of straightener overload control function during smoothing roll raising speed, occur miscarrying into, in this straightener roll of straightener overload control program, designed smoothing roll overload and controlled switching unit, this unit is comprised of JJGC09～JJGC14 functional block.The initiatively automatic flattening target velocity of smoothing roll drive motor
with its actual speed (n
act.R2) as input signal, be input to input X1 and the X2 of JJGC09, the output Y of JJGC09 accesses respectively the X1 input of JJGC10 and JJGC11, 100 revs/min of velocity deviation setting values are input to the X2 input of JJGC10, 10 revs/min of velocity deviation setting values are input to the X2 input of JJGC11, the input S of the output QU access JJGC12 of JJGC10, the input R of the output QL access JJGC12 of JJGC11, the output Q of JJGC12 is connected with the input I of JJGC13, T at JJGC13 holds the rear along delay time of 500 milliseconds of settings, the input I1 of the output Q access JJGC14 of JJGC13, I2 is as straightener manual manipulation mode signal input part, I3 is the straightener control system fault-signal input, the input I4 of JJGC14 is ' 0 '.
This element is by the initiatively automatic flattening target velocity of smoothing roll drive motor of straightener second
with its actual speed (n
act.R2) difference judge whether straightener is in the raising speed stage, equally as shown in Figure 3, when both speed differences are less than 10 revs/min, show the second initiatively approaching end of raising speed stage of smoothing roll, but, consider that straightener the 4th active smoothing roll belongs to the main roller of rectifying, its aligning load is larger, under same raising speed speed, its drive motor raising speed to the required time of straightener automatic flattening target velocity will be far above the second active smoothing roll needed raising speed time, both differ approximately 500 milliseconds, so, using the second input signal that initiatively the complete signal of smoothing roll raising speed is controlled as straightener roll of straightener overload after 500 millisecond time-delay again.In view of each smoothing roll aligning load in periodicity aligning process by the difference of the deflection along with before rolled piece aligning to be aligned and difference, so, the smoothing roll overload obtaining can not be controlled to data (being each active smoothing roll aligning speed correction value) as rolled piece is aligned overload control data later in aligning process once.For this reason, in this control module, the second automatic flattening target velocity of active smoothing roll drive motor and the difference of its actual speed are greater than to 100 revs/min as judging the straightener falling-rate period after aligning, and the overload control of excising the each smoothing roll of straightener with this signal, be about to each smoothing roll overload control data and be set to zero, smoothing roll overload control program will produce according to new actual straightening load condition corresponding smoothing roll overload and control data like this.Under manual aligning mode, consider that in aligning process, smoothing roll may exist frequent acceleration and deceleration, and the tensile stress forming by rolled piece between each smoothing roll in acceleration and deceleration process is normally unsettled, like this, the tensile stress that is difficult to form by rolled piece between each smoothing roll in manual acceleration and deceleration process is realized overload and is controlled.In addition, consider that manual aligning mode is mainly to adopt, and can say very little use in normal continuous straightening process when former rolled piece alignings that change after kind or specification.So under manual aligning mode, this smoothing roll overload control program is in excision state.
For the identification of smoothing roll overload and control module in smoothing roll overload control program, this unit is the core cell in smoothing roll overload control program, and it is comprised of JJGC01～JJGC08 and JJGC15～JJGC22 functional block.I
nand 5%I
naccess respectively input M and the HY of JJGC01～JJGC04, signal I simultaneously
r2.actthe input X of access JJGC01, signal I
r4.actthe input X of access JJGC02, signal I
r6.actthe input X of access JJGC03, signal I
r8.actthe input X of access JJGC04, the output QU of JJGC01～JJGC04 accesses respectively the input EN of JJGC05～JJGC08, at the input T of JJGC05～JJGC08, set respectively 100 milliseconds, the output Q of JJGC05～JJGC08 accesses respectively the input IU of JJGC15～JJGC18, the output Q of JJGC14 accesses respectively the input R of JJGC15～JJGC18, the output Y of JJGC15～JJGC18 accesses respectively the input X1 of JJGC19～JJGC22, the input X2 of JJGC19～JJGC22 is set as respectively-3 revs/min, the output Y of JJGC19～JJGC22 is as the speed correction value of corresponding active smoothing roll
be respectively
Whom this smoothing roll overload control program adopts transship the control principle of whose reduction of speed and realizes the overload control of each active smoothing roll.The active smoothing roll of overload is when reduction of speed, its upstream and downstream initiatively smoothing roll will produce push-and-pull action to it by rolled piece, make like this active smoothing roll of overload exit overload, overload active smoothing roll once exit overload, this smoothing roll stops reduction of speed, and keeps the speed in this moment until rolled piece aligning is complete.For this reason, this smoothing roll overload recognition unit adopts 4 " the overproof detection of two-way numerical value " functional block JJGC01～JJGC04 to complete respectively 4 initiatively overload identifications of smoothing roll of straightener.When there is overload in any one active smoothing roll, be that the actual armature supply of smoothing roll DC Transmission motor is while being greater than its specified armature supply 5%, the QU output of " the overproof detection of two-way numerical value " functional block of its correspondence will become ' 1 ' state, like this, controlling relevant rotary pulse generator (BBF) with this smoothing roll overload will be enabled, it is 100 milliseconds (being slightly less than the cycle period of smoothing roll overload control program) that the output Q of this rotary pulse generator will export width, cycle is the cycle pulse of 200 milliseconds, the counting forward pulse input end of controlling relevant " bidirectional counter " functional block with corresponding smoothing roll overload due to the output Q of this rotary pulse generator is connected, like this, the count value output Y of corresponding " bidirectional counter " functional block will increase gradually, and in the process increasing at the count value output Y of this " bidirectional counter " functional block, smoothing roll overload control module exports the speed correction value of corresponding active smoothing roll to
(≤0) will increase thereupon, like this, the corresponding initiatively aligning speed actual value of smoothing roll drive motor will decline thereupon, this smoothing roll drive motor armature supply (or output torque) also will decline thereupon simultaneously, when this smoothing roll drive motor armature supply is less than its specified armature supply 5%, this smoothing roll has exited overload, the QU output of now controlling corresponding " the overproof detection of two-way numerical value " functional block with this smoothing roll overload will become ' 0 ' state, and the rotary pulse generator that is subject to the control of this functional block QU output blocks for ' 0 ' state because of its enable signal, and it is constant that the count value output Y of " bidirectional counter " functional block relevant to this smoothing roll overload control will maintain initial value, like this, smoothing roll overload control module exports the speed correction value of this active smoothing roll to
also will remain unchanged, complete thus the overload control of overload smoothing roll.
In order to prevent controlling smoothing roll actual linear velocity and rolled piece translational speed are had big difference because of smoothing roll overload, cause thus smoothing roll wear extent excessive, by limiting the counting forward higher limit of controlling relevant " bidirectional counter " functional block to each active smoothing roll overload, realize the maximal rate correction quantitative limitation that each active smoothing roll overload is controlled.Consider that this straightener roll of straightener overload approximately 2 program cycle cycles of control program (approximately 200 milliseconds) refreshes smoothing roll overload control rate correction value one time, so, in order to improve the speed of smoothing roll overload control, suitably set the incremental change (as 3 revs/min) of speed correction each time in smoothing roll overload control procedure.
The present invention prevents that control system and the control method thereof of straightener roll of straightener overload from having dropped into use on Ma Gang great H shaped steel nine roller straighteners; Since this straightener roll of straightener overload controlling method comes into operation, there is not continuous straightening overload problem in the each initiatively smoothing roll of Ma Gang great H section straightener again, and practical effect is obvious.
Claims (9)
1. a control system that prevents straightener roll of straightener overload, comprising:
Smoothing roll overload is controlled switching unit, input signal is automatic flattening target velocity and its actual speed of straightener roll of straightener, the reduction of speed tune of determining smoothing roll by the contrast of target velocity and actual speed carries a section, and produces the switching signal that smoothing roll overload is controlled;
It is characterized in that: this system also comprises the identification of smoothing roll overload and control module;
The identification of smoothing roll overload and control module gather the actual current of the each smoothing roll of straightener, and compare with rated current by each smoothing roll actual current, complete the identification of overload smoothing roll, its corresponding rotary pulse generator of the overload smoothing roll identifying will be enabled, this rotary pulse generator will be exported cycle pulse signal to control counter corresponding to this smoothing roll, make the output of this counter increase progressively a number at each control cycle, until this smoothing roll exits overload or reaches the highest amplitude limit value of counter;
The identification of smoothing roll overload and control module reception smoothing roll overload are controlled the signal of switching unit, and by the Velocity Reference value reducing amount of corresponding active smoothing roll obtaining, make the actual speed of smoothing roll obtain corresponding reducing amount, with this, make this smoothing roll exit overload.
2. control system according to claim 1, it is characterized in that: the identification of described smoothing roll overload comprises and gathers corresponding initiatively LVM " the overproof detection of two-way numerical value " functional block, the BBF rotary pulse generator of smoothing roll actual current with control module, multiple LVM " the overproof detection of two-way numerical value " functional block parallel connection, sends to corresponding BBF rotary pulse generator one by one by signal after treatment; The specified armature supply I of input signal
nset value with electric current allowable deviation the input M and the HY that access respectively LVM " the overproof detection of two-way numerical value " functional block, the active smoothing roll actual current signal of collection accesses the input X of corresponding LVM " the overproof detection of two-way numerical value " functional block simultaneously; LVM " the overproof detection of two-way numerical value " the output QU of functional block accesses respectively the input EN of corresponding BBF rotary pulse generator, the input T that pulsewidth setting value accesses respectively BBF rotary pulse generator sends cycle pulse signal by output Q after the computing of BBF rotary pulse generator.
3. control system according to claim 2, is characterized in that: the described cycle pulse deration of signal is 100 milliseconds, and the cycle is 200 milliseconds.
4. control system according to claim 1, it is characterized in that: described smoothing roll overload sets with control module and also comprises CTR " bidirectional counter " functional block and MUL " multiplier " functional block, in this unit, many groups cycle pulse signal of many group rotary pulse generators output accesses respectively the input IU of corresponding CTR " bidirectional counter " functional block, the control signal of smoothing roll overload control switching unit accesses respectively the input R of CTR " bidirectional counter " functional block, the output Y of CTR " bidirectional counter " functional block accesses respectively the input X1 of MUL " multiplier " functional block one to one, the decrement signal of each circulation reference speed correction is input to respectively the input X2 of MUL " multiplier ", MUL " multiplier " output Y exports total reference speed correction value
control active smoothing roll one to one.
5. control system according to claim 1, is characterized in that: described smoothing roll overload control switching unit comprise SUB " subtracter " functional block, NCM " numeric ratio " functional block, RSR " rest-set flip-flop that reset terminal R is preferential " functional block, PDF " after along time delay " functional block and OR ' or ' door; The initiatively automatic flattening target velocity of smoothing roll drive motor of straightener second
with its actual speed (n
act.R2) as input signal, be input to respectively input X1 and the X2 of SUB " subtracter " functional block, the output Y of SUB " subtracter " functional block accesses the X1 input of two groups of NCM " numeric ratio " functional block simultaneously, two group of second active smoothing roll drive motor velocity deviation fiducial value is input to respectively the X2 input of two groups of NCM " numeric ratio " functional block, the input S of output QU access RSR " rest-set flip-flop that reset terminal R the is preferential " functional block of one group of NCM " numeric ratio " functional block, the input R of output QL access RSR " rest-set flip-flop that reset terminal R the is preferential " functional block of one group of NCM " numeric ratio " functional block, the output Q of RSR " rest-set flip-flop that reset terminal R is preferential " functional block and time delayed signal be input I and the T of PDF " after along time delay " functional block respectively, the output Q access OR ' of PDF " after along time delay " functional block or ' the input I1 of door, OR ' or ' door input I2 be straightener manual manipulation mode signal input part, OR ' or ' door input I3 be the straightener control system fault-signal input, OR ' or ' door input I4 be ' 0 ' signal.
6. a control method that prevents straightener roll of straightener overload, is characterized in that, the steps include:
Step 1, smoothing roll overload is controlled switching unit and is gathered the initiatively automatic flattening actual speed of smoothing roll driving motor of straightener second, and actual speed and target velocity contrast, initiatively smoothing roll has four, be respectively the first active smoothing roll, the second active smoothing roll, initiatively smoothing roll of the 3rd active smoothing roll and the 4th, the reference speed of four active smoothing roll driving motors is all identical, and acceleration and deceleration simultaneously, when the difference of the second active smoothing roll driving motor reference speed and actual speed is less than 10 revs/min, straightener the second active smoothing roll is in stablizing automatic flattening speed, again after 500 millisecond time-delay, straightener the 4th active smoothing roll is in stablizing automatic flattening speed, at this moment smoothing roll overload is controlled switching unit and is dropped into the control of smoothing roll overload, and when the difference of the second active smoothing roll driving motor reference speed and actual speed is greater than 100 revs/min, the falling-rate period of straightener after throwing steel, smoothing roll overload is controlled switching unit and is closed the control of smoothing roll overload,
Step 2, the identification of smoothing roll overload and control module gather the actual current of each active smoothing roll, and compare with the rated current of smoothing roll driving motor respectively, when the actual current of certain active smoothing roll is more than or equal to its rated current and electric current allowable deviation setting value sum, the identification of smoothing roll overload determines that with control module this smoothing roll is in overload; When certain is when initiatively the actual current of smoothing roll is less than or equal to the difference of its rated current and electric current allowable deviation setting value, the identification of smoothing roll overload and control module determine that this smoothing roll transships not at overload or exited overload;
Step 3, determine after the active smoothing roll of overload, smoothing roll overload sets with control module and makes the continuous reduction of speed of this active smoothing roll by output reference speed correction value, until it exits overload or has reached maximum, allows reduction of speed amount.
7. control method according to claim 6, is characterized in that: in described step 1 when second initiatively the target velocity of smoothing roll and the difference of its actual speed exceed 100 revs/min, think the falling-rate period of straightener after aligning.
8. control method according to claim 6, is characterized in that: in described step 2, when actual armature current value is greater than specified armature current value 5%, this active smoothing roll is initiatively smoothing roll of overload.
9. control method according to claim 6, is characterized in that: in described step 3, in smoothing roll overload control procedure, the decrement of speed correction is each time made as 3 revs/min.
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| CN201310753390.5A CN103752657B (en) | 2013-12-31 | 2013-12-31 | A kind of control system preventing straightener roll of straightener from transshipping |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN106734382A (en) * | 2016-12-19 | 2017-05-31 | 马钢(集团)控股有限公司 | The driving torque limiting control method of the section straightener with front and rear pinch roll |
| CN109240229A (en) * | 2018-09-12 | 2019-01-18 | 马鞍山钢铁股份有限公司 | The control method of section straightener straightening roll axial direction technique aligning zero correction |
| CN109821933A (en) * | 2019-03-05 | 2019-05-31 | 攀钢集团攀枝花钢钒有限公司 | The method of Automatic Optimal aligning interference torque |
| CN110315139A (en) * | 2019-07-25 | 2019-10-11 | 马鞍山钢铁股份有限公司 | A kind of monitoring system of section steel sawing machine upper saddle bearing wheels bearing deterioration state |
| CN112422021A (en) * | 2020-11-09 | 2021-02-26 | 马鞍山钢铁股份有限公司 | Control method for preventing overload of variable frequency motor lifted by cantilever crane |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN106734382A (en) * | 2016-12-19 | 2017-05-31 | 马钢(集团)控股有限公司 | The driving torque limiting control method of the section straightener with front and rear pinch roll |
| CN109240229A (en) * | 2018-09-12 | 2019-01-18 | 马鞍山钢铁股份有限公司 | The control method of section straightener straightening roll axial direction technique aligning zero correction |
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| CN110315139A (en) * | 2019-07-25 | 2019-10-11 | 马鞍山钢铁股份有限公司 | A kind of monitoring system of section steel sawing machine upper saddle bearing wheels bearing deterioration state |
| CN112422021A (en) * | 2020-11-09 | 2021-02-26 | 马鞍山钢铁股份有限公司 | Control method for preventing overload of variable frequency motor lifted by cantilever crane |
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