CN105598408A - AC (Alternating current) servo drive cast iron bar horizontal continuous caster control system - Google Patents

Abstract

The invention relates to the technical field of horizontal continuous caster control and particularly discloses an AC (alternating current) servo drive cast iron bar horizontal continuous caster control system. The system is characterized by comprising a PLC (programmable logic controller) and an AC servo system connected with the PLC, wherein the AC servo system is connected with an AC servo motor; the AC servo motor is connected with a speed reducer and a billet drawing roller; the AC servo motor and the PLC are connected through a photoelectric encoder; the photoelectric encoder is connected with the AC servo system; and the PLC is also connected with a touch screen. The system disclosed by the invention has the following advantages: the 131072P/r pulse of the servo motor is driven, the positioning accuracy of the system is high, control on uniform billet drawing step (the length of each billet drawing is consistent) is realized, and the billet drawing quality and the bar forming rate are improved. The control precision error of the drawing distance and reversing quantity does not exceed 0.1mm, and the pause time is controlled within 0.1s.

Description

The cast iron profile material horizontal caster control system that a kind of AC servo drives

Technical field

The present invention relates to horizontal caster control technology field, refer to especially the cast iron that a kind of AC servo drivesSection bar horizontal caster control system.

Background technology

The control accuracy of the drive system of cast iron horizontal continuous caster and throwing parameter is to guarantee cast iron horizontal continuous caster operationFurther high efficiency and the key factor of casting billet quality, casting billet quality depends on the parameter of strand velocity correlationThe control of (draw, rise amount, time of mid-stop and frequency of billet withdrawal etc.), these controls require equipment to hold exactlyThe drawing-in motion of row technological design, is easy to regulate the technological parameter that adapts to each stage billet withdrawing technology in distraction procedure,The particularly synchronism of the repeatability of drawing-in motion and multiple roll servo-drive.

At present, in China what realize that the control of horizontal caster throwing mainly adopts is hydraulic servo or direct currentServo-control system, this type systematic exists control accuracy not high (draw, rise amount), cause each draw,Rise amount inconsistent (step pitch inequality), affects casting billet quality, or causes matter density to decline, and even may produceThe accident of raw " bleedout ".

Therefore the control system that adopts high pulling torque high accuracy drive system and optimization is to realize the control of high-quality throwingNecessary condition, AC frequency conversion servo-control system is the ideal equipment of cast iron profile material horizontal caster control,The control accuracy and the reliability that have improved system, both overcome hydraulic servo control system stability and synchronismPoor, to be difficult to maintenance shortcoming, has avoided again DC servo control system rectification circuit complexity, direct current generator machineThe deficiency that tool commutator is easy to wear.

Summary of the invention

The object of this invention is to provide the cast iron profile material horizontal caster control system that a kind of AC servo drives,It is to provide high power AC servo horizontal caster system. Meet horizontal casting servo drive system moving,Static characteristic quality requirements: realize the quick tracing property of conticaster control and accurately locate, special multiple roll motorSynchronization Control.

To achieve these goals, the present invention has adopted following technical scheme: a kind of AC servo drivesCast iron profile material horizontal caster control system, is characterized in that, comprises that PLC controller and PLC controller connectThe AC servo connecing, connects AC servo motor in described AC servo, this AC servo motorUpper connection reductor and throwing roller; Between described AC servo motor and PLC controller, pass through photoelectric encoderConnect; Described photoelectric encoder is connected with described AC servo, on described PLC controller, is also connected withTouch-screen.

Beneficial effect of the present invention is: adopts after said system, drives the pulse of servomotor 131072P/ circle,System accuracy is high, realizes evenly (length of each throwing the is consistent) control of throwing step pitch, has improved and has drawnThe quality of base and the ratio of briquetting of section bar. Draw journey and anti-pushing volume control accuracy error to be no more than 0.1mm, when time-outBetween be controlled in 0.1s.

System is made up of HMI touch-screen, PLC controller and AC servo control system, and wherein PLC is responsible forCarry out related process control and logic control; Gathering conticaster key point temperature and throwing material, excellent footpath pushes awayCalculate the drawing parameter of optimization, generate servo-drive pulse train, control AC servo by technological requirementCarry out intermittent movement, because servo-drive system works in mode position, ensured the operation of throwing roller fixed length, drawJourney amount equates.

AC frequency conversion servo-control system has improved control accuracy and the reliability of system, has both overcome hydraulic pressure and has watchedThe shortcoming that takes stability of control system and poor synchronization, is difficult to maintenance, has avoided again DC servo control systemRectification circuit complexity, direct current generator mechanical rectification deficiency easy to wear.

Brief description of the drawings

In order to be illustrated more clearly in embodiment of the present invention technical scheme, required in describing embodiment belowThe accompanying drawing using is briefly described, apparently, the accompanying drawing in the following describes be only the present invention forBe illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below by p-embodiment or existingIn technical description, the accompanying drawing of required use is briefly described, for those of ordinary skill in the art,Do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is horizontal caster AC servo control program block diagram;

Fig. 2 is horizontal caster throwing control mode schematic diagram;

Fig. 3 is that the multistage pipeline of PTO/PWM generator is realized servomotor lifting frequency and constant-speed operation curveFigure;

Fig. 4 is servo controller main contactor Based Intelligent Control block diagram.

Wherein, in Fig. 2, T1-T3 is drawing time and rate curve, and T4 is idle hours, and T5 is during for counter pushing awayBetween, T6 pushes away idle hours for counter.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearlyChu, intactly description, obviously, described embodiment is only the present invention's part embodiment, instead ofWhole embodiment. Based on the embodiment in the present invention, those of ordinary skill in the art are not making creationThe every other embodiment obtaining under property work prerequisite, belongs to the scope of protection of the invention.

The cast iron profile material horizontal caster control system that a kind of AC servo as shown in Figure 1 drives, its featureBe, comprise the AC servo that PLC controller is connected with PLC controller, described AC servoUpper connection AC servo motor, connects reductor and throwing roller on this AC servo motor; Described AC servoBetween motor and PLC controller, be connected by photoelectric encoder; Described photoelectric encoder and described AC servoSystem connects, and on described PLC controller, is also connected with touch-screen.

As shown in Figure 2, a throwing cycle maximum is divided into 6 part: T1-T3 by throwing control modeFor drawing time and rate curve, T4 is idle hours, and T5 pushes away the time for counter, and T6 pushes away idle hours for counter.The throwing strategic point of horizontal casting is in the drawing stage, and its T1 and T3 time are respectively the acceleration of pulling rollsTime and braking time, play a crucial role to casting billet quality.

Drawing process implementation method

In conjunction with the technological requirement of Fig. 2, the present invention adopts the PTO/PWM in PLC (Siemens s7-200 series)The multistage pipeline function of generator realizes the control of billet withdrawing technology curve. The motion of servomotor is divided into and is addedSpeed, constant speed and decelerating phase. Adopt the 3 depot siding figure of Fig. 3 to can be good at realizing servomotor operation songLine, the drawing time that T is one-period, T1, T3 lifting frequency time.

The umber of pulse of supposing the every circle of servomotor is N, and the rotating speed of motor is V, the r/m of unit, and the drawing time ist，

The expression formula of motor rotation frequency is:

$f=\frac{v}{60}\×N---\left(1\right)$

The umber of pulse of motor within preset time is n:

$n=f\·t=\frac{v}{60}\×N\×t---\left(2\right)$

The umber of pulse n1 of lifting frequency range:

n₁＝(F_max-F_min)/ΔF(3)

The umber of pulse of constant frequency section is n2:

n₂＝n-2n₁(4)

AC servo driver main power source, by contactor connecting and disconnecting, must first be connected before normal operation,After out of service, should disconnect, but in horizontal casting control system especially manually in running, notWhen disconnected crawl moves, cause main contactor frequent movement, may cause very large impact to servo-driver,If but always connect and do not move, affect the life-span of the large electric capacity of driver major loop. For this problem originallyInvention has proposed main power source contactor intelligence and has postponed control algolithm, well addresses the above problem:

Basic thought of the present invention is: while automatically operation, main contactor is connected always, while changing into manual running statusAutomatically disconnect contactor. When operating for the first time drawing or push button manually time, connect main contactor, and openBegin regularly, if next drawing or push operation and control interval last time time timing disconnect main connecingTentaculum, otherwise remove the current timing of timer, main contactor continues to connect. Its workflow is shown in Fig. 4Shown in.

The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, not all at thisWithin bright spirit and principle, any amendment of doing, be equal to replacement, improvement etc., all should be included in thisWithin bright protection domain.

Claims (1)

1. the cast iron profile material horizontal caster control system that AC servo drives, is characterized in that, comprisesThe AC servo that PLC controller is connected with PLC controller, connects and exchanges in described AC servoServomotor, connects reductor and throwing roller on this AC servo motor; Described AC servo motor and PLCBetween controller, connect by photoelectric encoder; Described photoelectric encoder is connected with described AC servo,On described PLC controller, be also connected with touch-screen.