CN103752657B - A kind of control system preventing straightener roll of straightener from transshipping - Google Patents
A kind of control system preventing straightener roll of straightener from transshipping Download PDFInfo
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Abstract
The present invention relates to a kind of prevent straightener roll of straightener from transshipping control system and control method, comprise smoothing roll premature beats switching unit, input signal is automatic flattening target velocity and its actual speed of straightener roll of straightener, determine that the reduction of speed of smoothing roll adjusts a year section by the contrast of target velocity and actual speed, and produce the switching signal of smoothing roll premature beats; This system also comprises smoothing roll overload and identifies and control unit; Smoothing roll overload identifies the signal receiving smoothing roll premature beats switching unit with control unit, and pass through the Velocity Reference value reducing amount of the corresponding active smoothing roll obtained, the actual speed of smoothing roll is made to obtain corresponding reducing amount, this smoothing roll is made to exit overload with this, solve the uncontrollable problem of overload of straightener roll of straightener, improve aligning owner and rectify roller transmission mechanism service life and reduce the damage frequency of machine.
Description
Technical field
The present invention relates to electrical drive control system technical field, be specifically related to the control of straightener roll of straightener overload.
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 active smoothing roll (being numbered the second active smoothing roll, the 4th initiatively smoothing roll, the 6th initiatively smoothing roll and the 8th initiatively smoothing roll respectively), and each upper straightening roll is driven through reductor by a motor (220KW) respectively; And lower smoothing roll is passive smoothing roll (being numbered 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 respectively), 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 profile steel nine roller straightener, according to the needs of rolled piece straightening process, its second and the 4th initiatively smoothing roll be mainly rectify roller, 6th and the 8th active smoothing roll is time strong roller, the internal stresses release of rolled piece mainly completes in the Zhu Jiao district of straightener, and the Ci Jiao district of straightener has been mainly used in the smooth function of aligning rolled piece.Thus, in normal straightening process, second and the 4th the main pressure rectifying roller to rectify amount large, especially the 4th mainly rectify roller, and the pressure of the 6th and the 8th strong roller to rectify amount little.In view of the pressure amount of rectifying of section straightener primary and secondary smoothing roll 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.When not aligning premature beats, 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 the rolled piece that straightener aligning intensity is high, specification is large, the master of straightener rectifys roller and inevitably transships the phenomenon of even heavy overload, causes aligning owner to rectify low and frequent breakage in roller transmission mechanism service life.
Ma Gang great H profile steel straightener is when aligning big cross section shaped steel rolled piece (as: H300 × 300, BS305 × 305, H350 × 350, H400 × 400, H800 × 300 etc.), the master of straightener rectifys roller and there will be overload or heavy overload phenomenon, both at home and abroad so far also without any the control method about preventing straightener roll of straightener from transshipping.
Summary of the invention
In order to the uncontrollable problem of the overload solving straightener roll of straightener, the invention provides a kind of control system preventing straightener roll of straightener from transshipping, solve the uncontrollable problem of overload of straightener roll of straightener, improve aligning owner and rectify roller transmission mechanism service life and reduce the damage frequency of equipment.
Technical scheme of the present invention is: a kind of control system preventing straightener roll of straightener from transshipping, comprise: smoothing roll premature beats switching unit, input signal is automatic flattening target velocity and its actual speed of straightener second active smoothing roll, determined the stable straightening phase of smoothing roll by the contrast of target velocity and actual speed, and export corresponding smoothing roll premature beats enabling signal; This system also comprises smoothing roll overload and identifies and control unit; Smoothing roll overload identifies the actual current gathering each smoothing roll of straightener with control unit, and by each smoothing roll actual current compared with rated current, completes the identification of overload smoothing roll.The rotary pulse generator of its correspondence of overload smoothing roll identified will be enabled, thus, this rotary pulse generator will export cycle pulse signal to control counter corresponding to this smoothing roll, the output of this counter is made to increase progressively a number at each control cycle, until this smoothing roll exits overload or reaches the highest amplitude limit value of counter;
Smoothing roll overload identifies the signal receiving smoothing roll premature beats switching unit with control unit, and pass through the Velocity Reference value reducing amount of the corresponding active smoothing roll obtained, make the actual speed of smoothing roll obtain corresponding reducing amount, make this smoothing roll exit overload with this.
Described smoothing roll overload identifies LVM " the overproof detection of the two-way numerical value " functional block, the BBF rotary pulse generator that comprise with control unit and gather corresponding initiatively smoothing roll actual current, multiple LVM " the overproof detection of two-way numerical value " functional block is in parallel, and the signal after process is sent to one_to_one corresponding BBF rotary pulse generator; The specified armature supply I of input signal
naccess input M and HY of LVM " the overproof detection of two-way numerical value " functional block respectively, the input X of LVM " the overproof detection of the two-way numerical value " functional block of the active smoothing roll actual current signal access correspondence of collection with electric current allowable deviation setting value simultaneously; The output QU of LVM " the overproof detection of two-way numerical value " functional block accesses the input EN of corresponding BBF rotary pulse generator respectively, width sets value accesses the input T of BBF rotary pulse generator respectively, after the computing of BBF rotary pulse generator, send cycle pulse signal by output Q.
The described cycle pulse deration of signal is 100 milliseconds, and the cycle is 200 milliseconds.
Described smoothing roll overload sets and also comprises CTR " bidirectional counter " functional block and MUL " multiplier " functional block with control unit, many groups cycle pulse signal that in this unit, many group rotary pulse generators export accesses the input IU of corresponding CTR " bidirectional counter " functional block respectively, the control signal of smoothing roll premature beats switching unit accesses the input R of CTR " bidirectional counter " functional block respectively, the output Y of CTR " bidirectional counter " functional block accesses the input X1 of MUL " multiplier " functional block one to one respectively, the decrement signal of each circulation reference speed correction is input to the input X2 of MUL " multiplier " respectively, MUL " multiplier " output Y exports total reference speed correction value
control active smoothing roll one to one.
Described smoothing roll premature beats switching unit comprise SUB " subtracter " functional block, NCM " numeric ratio comparatively " 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 automatic flattening target velocity of straightener second active smoothing roll drive motor
input X1 and X2 of SUB " subtracter " functional block is input to respectively as input signal 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 comparatively " functional block simultaneously, two group of second active smoothing roll drive motor velocity deviation fiducial value is input to the X2 input of two groups of NCM " numeric ratio comparatively " functional block respectively, the output QU of one group of NCM " numeric ratio comparatively " functional block accesses the input S of RSR " rest-set flip-flop that reset terminal R is preferential " functional block, the output QL of one group of NCM " numeric ratio comparatively " functional block accesses the input R of RSR " rest-set flip-flop that reset terminal R is preferential " functional block, input I and T of the output Q of RSR " rest-set flip-flop that reset terminal R is preferential " functional block and time delayed signal PDF " after along time delay " functional block respectively, the output Q of PDF " after along time delay " functional block access OR ' or ' the input I1 of door, OR ' or ' the input I2 of door is straightener manual manipulation mode signal input part, OR ' or ' the input I3 of door is the straightener control system fault-signal input, OR ' or ' the input I4 of door is ' 0 ' signal.
Prevent the control method that straightener roll of straightener transships, the steps include:
Step 1, smoothing roll premature beats switching unit gather the automatic flattening actual speed of straightener second active smoothing roll driving motor, and actual speed and target velocity contrast.Consider that the reference speed of four, straightener active smoothing roll driving motor in automatic flattening process is all identical, and acceleration and deceleration simultaneously.Like this, when the difference of the second initiatively smoothing roll driving motor reference speed and actual speed is less than 10 revs/min, illustrate that straightener second active smoothing roll is close to stablizing automatic flattening speed, again after 500 millisecond time-delay, initiatively smoothing roll is also close to stablizing automatic flattening speed for straightener the 4th, and at this moment smoothing roll premature beats switching unit drops into smoothing roll premature beats; And when second initiatively smoothing roll driving motor reference speed is greater than 100 revs/min with the difference of actual speed, illustrates straightener be in throwing steel after falling-rate period, at this moment smoothing roll premature beats switching unit closedown smoothing roll premature beats;
Step 2, smoothing roll overload identifies the actual current gathering each active smoothing roll with control unit, 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, smoothing roll overload identifies and control unit determines that this smoothing roll is in overload; When the actual current of certain active smoothing roll is less than or equal to the difference of its rated current and electric current allowable deviation setting value, smoothing roll overload identifies and control unit determines that this smoothing roll transships not at overload or exited overload;
Step 3, determine overload active smoothing roll after, smoothing roll overload sets and makes the continuous reduction of speed of this active smoothing roll with control unit by output reference speed correction, until it exits overload or has reached maximum allow reduction of speed amount;
When the target velocity of active smoothing roll and the difference of actual speed are more than 100 turns of per minutes in described step 1, then think that straightener is in the falling-rate period after aligning.
In described step 2 when actual armature current value is greater than specified armature current value 5%, then this active smoothing roll is overload initiatively smoothing roll.
In described step 3 in smoothing roll premature beats process, the decrement of speed correction is each time set to 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 by rolled piece to it, the active smoothing roll transshipped is made to exit overload like this, at the active smoothing roll transshipped 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 identifies and control unit adopts 4 " the overproof detection of two-way numerical value " functional block JJGC01 ~ JJGC04; In order to prevent making smoothing roll actual linear velocity and rolled piece translational speed have big difference because of smoothing roll premature beats, cause smoothing roll wear extent excessive thus, realize the maximal rate correction quantitative limitation to each active smoothing roll premature beats by the counting forward higher limit limiting " bidirectional counter " functional block relevant to each active smoothing roll premature beats.
The present invention has following good effect: smoothing roll premature beats switching unit can prevent this straightener roll of straightener premature beats function occur miscarrying during smoothing roll raising speed into situation, whom this smoothing roll premature beats program adopts transship the Controlling principle of whose reduction of speed to realize the premature beats of each active smoothing roll, can realize the maximal rate correction quantitative limitation to each active smoothing roll premature beats by the counting forward higher limit limiting " bidirectional counter " functional block relevant to each active smoothing roll premature beats.The incremental change of speed correction each time in suitable setting smoothing roll premature beats process, can improve the speed of smoothing roll premature beats.
Accompanying drawing explanation
Fig. 1 Ma Gang great H profile steel straightener roll of straightener arranges schematic diagram;
Fig. 2 Ma Gang great H profile steel straightener is smoothing roll speed reducer structure schematic diagram initiatively;
The Control system architecture figure that Fig. 3 prevents section straightener smoothing roll from transshipping.
Detailed description of the invention
1-3 illustrates present embodiment by reference to the accompanying drawings.As in Fig. 3, LVM is " the overproof detection of two-way numerical value " functional block, and as X >=M+HY, QU is ' 1 ', and as M-HY < X < M+HY, QU keeps ortho states, and as X≤M-HY, QU is ' 0 '; SUB is " subtracter " functional block; NCM is " numeric ratio comparatively " functional block, and as X1 > X2, QU is ' 1 ', and as X1=X2, QE is ' 1 ', and as 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 be ' 1 ', R is ' 0 ', Q is ' 1 ', QN is ' 0 ', when S is ' 1 ', when R is ' 1 ', Q is ' 0 ', QN is ' 1 ', when S is ' 0 ', when R is ' 0 ', Q and QN keeps ortho states, when S is ' 0 ', when R is ' 1 ', Q is ' 0 ' QN is ' 1 '; OR is ' or ' door; BBF is rotary pulse generator, and pulse width is T, the pulse period is 2T; 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, SV is the setting value of counter, LU and LL is respectively the bound of counter, 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 units, and namely smoothing roll premature beats switching unit and smoothing roll overload identify and control unit.Output torque when smoothing roll drive motor band carries carries primarily of smoothing roll with and accelerates moment of torsion and rolled piece and align moment of torsion two parts and form, and this two parts moment of torsion all can make smoothing roll drive motor be in overload.Smoothing roll with carries acceleration moment of torsion and belongs to dynamic torque, only just there will be at smoothing roll boost phase.In view of the needs of straightening process and equipment, in straightener is in all the time under automated manner " until steel---band steel accelerates (about 1.2 seconds)---steady and continuous aligning (about 6.6 seconds)---rolled piece throw tail then slow down---treats steel " such On The Cycle Working Process, straightener roll of straightener drive motor carries needs that the dynamic overload occurred between accelerated period is straightening process and equipment for straightening allows at of short duration with, this smoothing roll with carries and accelerates the moment of torsion of moment of torsion mainly required for the acceleration of smoothing roll transmission mechanism body, 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 gear reduction mechanism does not transmit this part moment of torsion in boosting velocity procedure, this that is, even if smoothing roll drive motor carries in boosting velocity procedure at with and is in overload, smoothing roll transmission speed reducer also may not be in overload or heavy overload state, in addition, consider that this straightener roll of straightener premature beats is mainly used in controlling the overload of smoothing roll mechanical transmission mechanism (i.e. smoothing roll transmission speed reducer).So, without the need to considering the dynamic overload during the of short duration raising speed of smoothing roll in this straightener roll of straightener premature beats program.
In order to prevent from this straightener roll of straightener premature beats function from occurring during smoothing roll raising speed miscarrying into, in this straightener roll of straightener premature beats program, devise smoothing roll premature beats switching unit, this unit is made up of JJGC09 ~ JJGC14 functional block.The initiatively automatic flattening target velocity of smoothing roll drive motor
with its actual speed (n
act.R2) input X1 and X2 of JJGC09 is input to as input signal, the output Y of JJGC09 accesses the X1 input of JJGC10 and JJGC11 respectively, 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 output QU of JJGC10 accesses the input S of JJGC12, the output QL of JJGC11 accesses the input R of JJGC12, the input I of output Q and the JJGC13 of JJGC12 is connected, the rear along delay time of setting 500 milliseconds is held at the T of JJGC13, the output Q of JJGC13 accesses the input I1 of JJGC14, 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 automatic flattening target velocity of straightener second active smoothing roll drive motor
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 that the raising speed stage of the second active smoothing roll is close to terminating, but, consider that straightener the 4th active smoothing roll belongs to main and rectifys roller, its aligning load is larger, under same raising speed speed, time needed for its drive motor raising speed to straightener automatic flattening target velocity will far above the speed up time required for the second active smoothing roll, both differences about 500 milliseconds, so, using second initiatively the complete signal of smoothing roll raising speed again after 500 millisecond time-delay as the input signal of straightener roll of straightener premature beats.In view of each smoothing roll aligning load is different by the difference along with the deflection treated before aligning rolled piece aligning in periodicity straightening process, so, the premature beats data smoothing roll premature beats data obtained in a straightening process (i.e. each active smoothing roll aligning speed correction) can not aligned as later rolled piece.For this reason, in this control unit, using second, initiatively the automatic flattening target velocity of smoothing roll drive motor and the difference of its actual speed are greater than 100 revs/min as judging that straightener has been in the falling-rate period after aligning, and the premature beats of each smoothing roll of straightener is excised with this signal, be set to zero by each smoothing roll premature beats data, such smoothing roll premature beats program produces corresponding smoothing roll premature beats data by according to new actual straightening load condition.Under manual aligning mode, consider that in straightening process, smoothing roll may exist frequent acceleration and deceleration, and the tensile stress formed by rolled piece between each smoothing roll in acceleration and deceleration process is normally unstable, like this, the tensile stress being difficult between each smoothing roll be formed by rolled piece in manual acceleration and deceleration process realizes premature beats.In addition, consider that the former piece rolled pieces of manual aligning mode mainly after changing kind or specification adopt when aligning, very little use in normal continuous straightening process can be said.So under manual aligning mode, this smoothing roll premature beats program is in excision state.
Identify and control unit for the smoothing roll overload in smoothing roll premature beats program, this unit is the core cell in smoothing roll premature beats program, and it is made up of JJGC01 ~ JJGC08 and JJGC15 ~ JJGC22 functional block.I
nand 5%I
naccess input M and HY of JJGC01 ~ JJGC04 respectively, 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 the input EN of JJGC05 ~ JJGC08 respectively, 100 milliseconds are set respectively at the input T of JJGC05 ~ JJGC08, the output Q of JJGC05 ~ JJGC08 accesses the input IU of JJGC15 ~ JJGC18 respectively, the output Q of JJGC14 accesses the input R of JJGC15 ~ JJGC18 respectively, the output Y of JJGC15 ~ JJGC18 accesses the input X1 of JJGC19 ~ JJGC22 respectively, the input X2 of JJGC19 ~ JJGC22 is set as-3 revs/min respectively, the output Y of JJGC19 ~ JJGC22 is as the speed correction of corresponding active smoothing roll
be respectively
Whom this smoothing roll premature beats program adopts transship the Controlling principle of whose reduction of speed to realize the premature beats 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 by rolled piece to it, the active smoothing roll transshipped is made to exit overload like this, at the active smoothing roll transshipped 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 the overload identification of 4, straightener active smoothing roll respectively.When initiatively there is overload in smoothing roll for any one, namely when the actual armature supply of smoothing roll DC Transmission motor is 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, the rotary pulse generator (BBF) relevant with this smoothing roll premature beats will be enabled, output width is 100 milliseconds (being slightly less than the cycle period of smoothing roll premature beats program) by the output Q of this rotary pulse generator, cycle is the cycle pulse of 200 milliseconds, because the counting forward pulse input end of the output Q of this rotary pulse generator " bidirectional counter " functional block relevant with corresponding smoothing roll premature beats is connected, like this, the count value of corresponding " bidirectional counter " functional block exports Y will be increased gradually, and export in the process of Y increase in the count value of this " bidirectional counter " functional block, smoothing roll premature beats unit exports the speed correction of corresponding active smoothing roll to
(≤0) will increase thereupon, like this, the aligning speed actual value of corresponding active 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 exits overload, the QU output of now corresponding with this smoothing roll premature beats " the overproof detection of two-way numerical value " functional block will become ' 0 ' state, and the rotary pulse generator controlled by this functional block QU output because of its enable signal be ' 0 ' state and blocking, and the count value of " bidirectional counter " functional block relevant to this smoothing roll premature beats exports Y, and will to maintain initial value constant, like this, smoothing roll premature beats unit exports the speed correction of this active smoothing roll to
also will remain unchanged, this completes the premature beats of overload smoothing roll.
In order to prevent making smoothing roll actual linear velocity and rolled piece translational speed have big difference because of smoothing roll premature beats, cause smoothing roll wear extent excessive thus, realize the maximal rate correction quantitative limitation to each active smoothing roll premature beats by the counting forward higher limit limiting " bidirectional counter " functional block relevant to each active smoothing roll premature beats.Consider that this straightener roll of straightener premature beats program about 2 program cycle cycles (about 200 milliseconds) refresh a smoothing roll premature beats speed correction, so, in order to improve the speed of smoothing roll premature beats, the incremental change (as 3 revs/min) of suitably speed correction each time in setting smoothing roll premature beats process.
The control system that the present invention prevents straightener roll of straightener from transshipping and control method thereof have dropped into use on Ma Gang great H profile steel nine roller straightener; Since this straightener roll of straightener overload controlling method comes into operation, not there is not continuous straightening overload problem in each initiatively smoothing roll of Ma Gang great H profile steel straightener, practical effect obvious again.
Claims (9)
1. the control system preventing straightener roll of straightener from transshipping, comprising:
Smoothing roll premature beats switching unit, input signal is automatic flattening target velocity and its actual speed of straightener roll of straightener, determine that the reduction of speed of smoothing roll adjusts a year section by the contrast of target velocity and actual speed, and produce the switching signal of smoothing roll premature beats;
It is characterized in that: this system also comprises smoothing roll overload and identifies and control unit;
Smoothing roll overload identifies the actual current gathering each smoothing roll of straightener with control unit, and by each smoothing roll actual current compared with rated current, complete the identification of overload smoothing roll, the rotary pulse generator of its correspondence of overload smoothing roll identified will be enabled, this rotary pulse generator will export cycle pulse signal to control counter corresponding to this smoothing roll, the output of this counter is made to increase progressively a number at each control cycle, until this smoothing roll exits overload or reaches the highest amplitude limit value of counter;
Smoothing roll overload identifies the signal receiving smoothing roll premature beats switching unit with control unit, and pass through the Velocity Reference value reducing amount of the corresponding active smoothing roll obtained, make the actual speed of smoothing roll obtain corresponding reducing amount, make this smoothing roll exit overload with this.
2. control system according to claim 1, it is characterized in that: described smoothing roll overload identifies LVM " the overproof detection of the two-way numerical value " functional block, the BBF rotary pulse generator that comprise with control unit and gather corresponding initiatively smoothing roll actual current, multiple LVM " the overproof detection of two-way numerical value " functional block is in parallel, and the signal after process is sent to the BBF rotary pulse generator connected one to one with LVM " the overproof detection of two-way numerical value " functional block; The specified armature supply I of input signal
naccess input M and HY of LVM " the overproof detection of two-way numerical value " functional block respectively, the input X of LVM " the overproof detection of the two-way numerical value " functional block of the active smoothing roll actual current signal access correspondence of collection with electric current allowable deviation setting value simultaneously; The output QU of LVM " the overproof detection of two-way numerical value " functional block accesses the input EN of corresponding BBF rotary pulse generator respectively, cycle pulse deration of signal setting value accesses the input T of BBF rotary pulse generator respectively, after the computing of BBF rotary pulse generator, send cycle pulse signal by output Q.
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 2, it is characterized in that: described smoothing roll overload identifies and control unit also comprises CTR " bidirectional counter " functional block and MUL " multiplier " functional block, many groups cycle pulse signal that in this unit, many group rotary pulse generators export accesses the input IU of corresponding CTR " bidirectional counter " functional block respectively, the control signal of smoothing roll premature beats switching unit accesses the input R of CTR " bidirectional counter " functional block respectively, the output Y of CTR " bidirectional counter " functional block accesses the input X1 of MUL " multiplier " functional block one to one respectively, the decrement signal of each circulation reference speed correction is input to the input X2 of MUL " multiplier " respectively, MUL " multiplier " output Y exports total reference speed correction value
control active smoothing roll one to one, wherein
be the second active smoothing roll reference speed correction value,
be the 4th initiatively smoothing roll reference speed correction value,
be the 6th initiatively smoothing roll reference speed correction value,
it is the 8th active smoothing roll reference speed correction value.
5. control system according to claim 1, is characterized in that: described smoothing roll premature beats switching unit comprise SUB " subtracter " functional block, NCM " numeric ratio comparatively " 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; automatic flattening target velocity and its actual speed of straightener second active smoothing roll drive motor are input to input X1 and X2 of SUB " subtracter " functional block respectively as input signal, the output Y of SUB " subtracter " functional block accesses the X1 input of two groups of NCM " numeric ratio comparatively " functional block simultaneously, two group of second active smoothing roll drive motor velocity deviation fiducial value is input to the X2 input of two groups of NCM " numeric ratio comparatively " functional block respectively, the output QU of one group of NCM " numeric ratio comparatively " functional block accesses the input S of RSR " rest-set flip-flop that reset terminal R is preferential " functional block, the output QL of one group of NCM " numeric ratio comparatively " functional block accesses the input R of RSR " rest-set flip-flop that reset terminal R is preferential " functional block, the output Q of RSR " rest-set flip-flop that reset terminal R is preferential " functional block and time delayed signal access input I and T of PDF " after along time delay " functional block respectively, the output Q of PDF " after along time delay " functional block access OR ' or ' the input I1 of door, OR ' or ' the input I2 of door is straightener manual manipulation mode signal input part, OR ' or ' the input I3 of door is the straightener control system fault-signal input, OR ' or ' the input I4 of door is ' 0 ' signal.
6. the control method preventing straightener roll of straightener from transshipping, is characterized in that, the steps include:
Step 1, smoothing roll premature beats switching unit gathers the automatic flattening actual speed of straightener second active smoothing roll driving motor, and actual speed and target velocity contrast, initiatively smoothing roll has four, be respectively the first active smoothing roll, second active smoothing roll, 3rd active smoothing roll and the 4th initiatively smoothing roll, the reference speed of four active smoothing roll driving motors is all identical, and acceleration and deceleration simultaneously, when the difference of the second initiatively smoothing roll driving motor reference speed and actual speed is less than 10 revs/min, straightener second active smoothing roll is close to stablizing automatic flattening speed, again after 500 millisecond time-delay, straightener the 4th active smoothing roll is close to stablizing automatic flattening speed, at this moment smoothing roll premature beats switching unit drops into smoothing roll premature beats, and when second initiatively smoothing roll driving motor reference speed is greater than 100 revs/min with the difference of actual speed, straightener is in the falling-rate period after throwing steel, smoothing roll premature beats switching unit closedown smoothing roll premature beats,
Step 2, smoothing roll overload identifies the actual current gathering each active smoothing roll with control unit, 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, smoothing roll overload identifies and control unit determines that this smoothing roll is in overload; When the actual current of certain active smoothing roll is less than or equal to the difference of its rated current and electric current allowable deviation setting value, smoothing roll overload identifies and control unit determines that this smoothing roll transships not at overload or exited overload;
Step 3, determine overload active smoothing roll after, smoothing roll overload sets and makes the continuous reduction of speed of this active smoothing roll with control unit by output reference speed correction, until it exits overload or has reached maximum allow 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 more than 100 revs/min, then think that straightener is in the falling-rate period after aligning.
8. control method according to claim 6, is characterized in that: in described step 2 when actual current value is greater than load current value 5%, then this active smoothing roll is overload initiatively smoothing roll.
9. control method according to claim 6, is characterized in that: in described step 3 in smoothing roll premature beats process, and the decrement of speed correction is each time set to 3 revs/min.
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| CN106734382B (en) * | 2016-12-19 | 2019-02-19 | 马钢(集团)控股有限公司 | The driving torque limiting control method of section straightener with front and back pinch roller |
| 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 |
| CN109240229B (en) * | 2018-09-12 | 2020-12-01 | 马鞍山钢铁股份有限公司 | Control method for straightening zero correction of straightening roll axial process of section steel straightening machine |
| CN109821933B (en) * | 2019-03-05 | 2020-07-17 | 攀钢集团攀枝花钢钒有限公司 | Method for automatically optimizing straightening interference torque |
| CN110315139B (en) * | 2019-07-25 | 2020-11-10 | 马鞍山钢铁股份有限公司 | Monitoring system for bearing degradation state of sliding seat bearing wheel on section steel saw machine |
| CN112422021B (en) * | 2020-11-09 | 2022-12-23 | 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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| US6976900B2 (en) * | 2004-03-05 | 2005-12-20 | United States Steel Corp. | Automatic roll data acquisition system |
| CN202141930U (en) * | 2011-06-29 | 2012-02-08 | 天津赛瑞机器设备有限公司 | Control system of straightening machine for six-roller steel pipe |
| CN103056199B (en) * | 2012-09-26 | 2015-06-03 | 攀钢集团攀枝花钢钒有限公司 | Method and system for adjusting and controlling speed of strengthening roll of horizontal roll type straightening machine |
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