CN101920320A - Direct drive crystallizer vibration generator device and vibration method thereof - Google Patents

Abstract

The invention discloses a direct drive crystallizer vibration generator device, wherein a driving device comprises a low-speed large-torsion direct drive motor. A rotating shaft of the direct drive motor is rigidly connected to a center shaft of an eccentric shaft. The rotation speed of the direct drive motor is controlled by a control device at real time. The invention also discloses a vibration method of the device. The control device controls the direct drive motor to drive the eccentric shaft to rotate. An angular velocity omega of the direct drive motor is as follows: K equal to 192*pi*2f3/(1-alpha)*(1+alpha)3, epsilon equal to -48pi*alpha f2/(1-alpha)*(1+alpha)2, and alpha equal to 4/(2-T1), wherein T is vibration period, T1 is descending period, f is frequency and t is time. A transmission system in the invention is greatly simplified, the structure is compact, the direct drive motor only runs on a single direction without changing the other mechanical structure of the traditional crystallizer vibration generator device, the service life is prolonged, and the whole structure has the advantages of big bearing capability, strong anti-compact property, high reliability, and the like.

Description

Directly drive crystallizer vibration generator device and method for oscillating thereof

Technical field

The present invention relates to the crystallizer vibration generator device that a kind of metallurgical continuous casting is used, especially a kind of crystallizer vibration generator device.The invention still further relates to a kind of method for oscillating of crystallizer vibration generator device.

Background technology

Mold oscillation is one of core technology of continuous casting steel machine, and its generating means is the heart component of mold oscillation, is continuous casting worker's research object for many years always.Especially in recent years, the crystallizer form of popular non-sinusoidal oscillation progressively.Because this technology is to improving casting speed, improving aspect such as slab quality and have positive effect, the generating means of mold oscillation mechanism has become professional person's research focus especially, has occurred the multiple crystallizer vibration generator device that can realize non-sinusoidal oscillation thus in the industry.Realize non-sinusoidal oscillation, its generating means must be that have can programme controlled kinetic control system.At present, the generating means on continuous casting industry mold oscillation roughly has following several:

1. the Mechanical Driven sinusoidal vibration generating means that generally uses, i.e. the most traditional vibration generating arrangement of forming by parts such as AC asynchronous motor, reductor and eccentric shafts.This vibration generating arrangement is simple in structure, and running is reliable, uses large in number and widely distributed in the continuous casting, but owing to can only do sinusoidal vibration, can not do non-sinusoidal oscillation, casting speed, slab surface quality can not get further raising, more and more can not satisfy the technological requirement of modern continuous casting.

2. the Mechanical Driven non sine vibration generating arrangement promptly adds the mechanical driving device that can produce non-sinusoidal oscillation, again as non-circular gear or anti-parallelogram mechanism or the like in above-mentioned mechanically operated apparatus structure.This Mechanical Driven non sine vibration generating arrangement, because in traditional Mechanical Driven, increased transmission link again one, the drives structure volume is increased, complex structure, and having reduced the stationarity of mold oscillation and the precision of motion, single moving wave shape can not onlinely be regulated again, so using value is little.

3. the crystallizer vibration generator device that drives of servo hydraulic cylinder.

4. the crystallizer vibration generator device that drives of servo electric jar.

The 3rd kind of servo hydraulic cylinder and the 4th kind of crystallizer vibration generator device that servo electric jar drives, but its drive form programme-control can both realize non-sinusoidal oscillation, and can online as requested adjusting, this two speciogenesis device is a principal mode of carrying out the mould non-sinusoidal vibration at present.But in actual applications, servo hydraulic cylinder exists the shortcoming that system complex, maintenance capacity are big, the input valency is high; The shortcoming that servo electric jar exists is, the up-down vibration of crystallizer, it is the frequent realization of just changeing, reverse by servomotor, and the quality of crystallizer vibration platform is bigger, and this frequent rotating brings influence inevitably for the response speed and the tracking accuracy of the curves such as displacement, speed of mold oscillation, so, design to shake table must meet certain requirement, like this, just is subjected to some restriction in applying.

Summary of the invention

Technical problem to be solved by this invention provides a kind of continuous cast mold vibration generating arrangement and method for oscillating thereof, wherein continuous cast mold vibration generating arrangement claimed structure is simply compact, the reliability height, the method for oscillating of its realization can comprise the multiple mode of vibration of sine or non-sinusoidal oscillation, can its vibrational waveform of online adjusting.

For solving the problems of the technologies described above, the technical scheme that the present invention directly drives crystallizer vibration generator device is, the involving vibrations platform, described shake table is connected on the eccentric part of eccentric shaft by connecting rod, a drive unit drives the eccentric shaft rotation makes described shake table vibrate, described drive unit comprises the direct driving motor of a slow-speed of revolution, high pulling torque, the rotating shaft of described direct driving motor and the central shaft of described eccentric shaft are rigidly connected, and the rotating speed of described direct driving motor is controlled in real time by a control device.

The present invention also provides a kind of method for oscillating that adopts above-mentioned direct driving crystallizer vibration generator device to realize, its technical scheme is, described control device control direct driving motor drives described eccentric shaft and rotates, and the rotational angular ω of described direct driving motor is:

$\mathrm{\&omega;}=\left\{\begin{array}{cc}\mathrm{\&pi;}/T_1& 0\&le;t\&le;T_1\\ 1/2{\mathrm{<figure-callout\; id="2"\; label="Kt"\; filenames="H2009100574359E0000011.png"\; state="\{\{state\}\}">Kt</figure-callout>}}^2+\mathrm{\&epsiv;t}+\mathrm{\&pi;}/T_1& T_1\&le;t<T\end{array}\right.;$

K＝192*π*2f ³/(1-α)*(1+α) ³；

ε＝-48π*αf ²/(1-α)*(1+α) ²；

α＝4/(2-T ₁)；

Wherein, T is the vibration period, T ₁Be decline cycle, f is a frequency, and t is the time.

Transmission system is simplified greatly among the present invention, and compact conformation must not change other frame for movements of present traditional mould vibration device, and direct driving motor is as long as press folk prescription to running, prolong service life, overall structure has that bearing capacity is big, anti-impact force strong, the reliability advantages of higher.

Description of drawings

The present invention is further detailed explanation below in conjunction with drawings and Examples:

Fig. 1 directly drives the structural representation of crystallizer vibration generator device for the present invention;

Fig. 2 gets schematic diagram for the present invention directly drives the crystallizer vibration generator device motion structure;

Fig. 3 is the displacement and the linear velocity curve of mechanism shown in Figure 2;

Fig. 4 directly drives the displacement and the linear velocity curve of the non-sine motion of crystallizer vibration generator device realization for the present invention;

Fig. 5 is the curve of angular speed in the motion shown in Figure 4;

Fig. 6 and Fig. 7 are the curve map of the non-sinusoidal oscillation of employing different parameters realization.

The specific embodiment

The invention provides a kind of direct driving crystallizer vibration generator device, involving vibrations platform 4, described shake table 4 is connected on the eccentric part of eccentric shaft 2 by connecting rod 3, a drive unit drives eccentric shaft 2 rotations makes described shake table 4 vibrate, described drive unit comprises the direct driving motor 1 of a slow-speed of revolution, high pulling torque, the central shaft of the rotating shaft of described direct driving motor 1 and described eccentric shaft 2 is rigidly connected, and the rotating speed of described direct driving motor 1 is controlled in real time by a control device.

The present invention also provides a kind of method for oscillating that adopts the direct driving crystallizer of above-mentioned direct driving crystallizer vibration generator device realization, and described control device control direct driving motor drives described eccentric shaft and rotates, and the rotational angular ω of described direct driving motor is:

$\mathrm{\&omega;}=\left\{\begin{array}{cc}\mathrm{\&pi;}/T_1& 0\&le;t\&le;T_1\\ 1/2{\mathrm{<figure-callout\; id="2"\; label="Kt"\; filenames="H2009100574359E0000011.png"\; state="\{\{state\}\}">Kt</figure-callout>}}^2+\mathrm{\&epsiv;t}+\mathrm{\&pi;}/T_1& T_1\&le;t<T\end{array}\right.;$

K＝192*π*2f ³/(1-α)*(1+α) ³；

ε＝-48π*αf ²/(1-α)*(1+α) ²；

α＝4/(2-T ₁)；

Wherein, T is the vibration period, T ₁Be decline cycle, f is a frequency, and t is the time.

The present invention directly drives crystallizer vibration generator device and adopts advanced direct driving technologies, promptly comes crystallization control device vibration generating arrangement with Direct Driving System.Direct driving motor and control system have been comprised among the present invention.Existing mould vibration device all adopts AC induction motor as drive motors, and the operation principle of asynchronous machine (induction machine) is that the rotating excitation field by stator produces induced-current in rotor, produces electromagnetic torque, does not directly produce magnetic field in the rotor.Therefore, the rotating speed of rotor must be less than with leg speed.Do not have this difference, promptly revolutional slip does not just have rotor inductive currents, therefore is called asynchronous machine yet.AC induction motor rotating speed height, good speed adjustment features, but its output torque is little, must can drive load by reducing gear.Revolutional slip owing to asynchronous machine is that its discreteness is very big by the manufacturing process decision of motor simultaneously, and the variation of load directly influences rotating speed of motor, the accurate high-speed motion control of very difficult realization.And stud with permanent magnet in the rotor of the synchronous motor that is adopted among the present invention, after the motor transient starting finishes, motor changes normal operation over to, the stator rotating excitation field drives the rotor that studs with permanent magnet and carries out synchronous operation, this moment, rotating speed of motor formed strict corresponding relationship according to the number of poles and the motor input supply frequency of motor, and rotating speed is not influenced by load and other factors.Synchronous motor has characteristics such as the slow-speed of revolution, high pulling torque, overload capacity are strong, response is fast, the characteristic linearity is good, torque fluctuations is little, is applied to can directly drive load among the present invention and saves under drive gear, realizes accurate movement control.Described direct driving motor is the permanent excitation magnetic synchronization motor of a kind of multipole logarithm, it does not need to pass through reducing gear, just can be directly and load be rigidly connected, in technical solution of the present invention, it can not need reductor and shaft coupling, directly be connected with the eccentric shaft of shake table, described eccentric shaft is connected with shake table by connecting rod, so just formed a complete driving-chain: the rotatablely moving of described direct driving electric rotating machine, just described eccentric shaft rotatablely moves, rotatablely moving of described eccentric shaft by described connecting rod, drives described shake table and converted up-down vibration to.Because rotating ratio i=1, described eccentric shaft whenever revolves and turns around, and described shake table is just finished a vibration period.Direct driving electric rotating machine described here is controlled by kinetic control system, and kinetic control system comprises, motion controller and driving governor.Kinetic control system is integrated in factory's electric control system by communication modes, described kinetic control system is accepted technological order and the on-the-spot technological parameter that factory's electric control system is sent, kinetic control system is according to technological order, control algolithm by the advanced person generates the multiple oscillating curve that comprises sine or non-sinusoidal oscillation, and the direct driving electric rotating machine that is attached thereto according to the oscillating curve control of on-the-spot technological parameter and generation, thereby drive the oscillating curve motion of vibrating device according to appointment.If realize the non-sine motion, as long as just can realize by the angular speed that changes eccentric shaft uplink interval and downlink interval.For example, up angular speed is made as at the uniform velocity, descending angular speed is made as parabolic, and equate, eliminate sudden change at upper and lower dead-centre position angular speed.

Prior mechanical continuous cast mold vibration generating arrangement reduces rotating speed because the existence of reducing gear need be connected to motor on the reducing gear by the parts of shaft joint by reducing gear, improves moment of torsion, drives eccentric shaft then and rotates.If just carry out sinusoidal vibration, as long as the eccentric shaft uniform rotation just can, prior mechanical continuous cast mold vibration generating arrangement can be finished, but for non-sinusoidal oscillation, needing eccentric shaft to make speed change rotates, and the frequency of velocity variations is very high, and in the prior mechanical continuous cast mold vibration generating arrangement, because can there be the surplus in the cooperation each other in the gear in the reducing gear, and the reducing gear middle gear has inertia, this can cause motor can't drive the non-sinusoidal oscillation that eccentric shaft is expected accurately, in addition in the process of carrying out variable motion, can constantly bump between the gear, quicken the wearing and tearing of parts, shorten service life.And the present invention directly drives eccentric shaft by adopting direct driving motor; not only reduced the mechanical realization on the crystallizer vibration generator device, also eliminated reducing gear, both satisfied modern continuous casting process requirement the adverse effect that non-sinusoidal oscillation produces; reduce impact again, protected plant equipment.

The present eccentric shaft-driven mould vibration device that on continuous casting industry mould vibration device, generally uses, it generally is the method that adopts uniform motion, as shown in Figure 2, when l/r was enough big, the moving displacement that C is ordered was similar to sine curve, with the A point is initial point, the displacement S that C is ordered, the curve of speed V as shown in Figure 3, displacement S ≈ r*cos ω t wherein, speed V ≈-r*sin ω t, wherein ω is an angular speed, and t is the time.

This motor pattern is sinusoidal vibration, is not non-sinusoidal oscillation, and consequently slab surface quality can not get improving.Along with the development of continuous casting technology, a kind of non-sinusoidal oscillation pattern has appearred, as shown in Figure 4 and Figure 5, i.e. the speed V that moves downward of crystallizer ₁Greater than upward speed V ₂(V ₁＞V ₂), equation is as follows:

$\left\{\begin{array}{cc}{V}_1=-r*{\mathrm{\&omega;}}_1*\sin {\mathrm{\&omega;}}_1\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="H2009100574359E0000031.png"\; state="\{\{state\}\}">t</figure-callout>}& 0\&le;t<T_1\\ {\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="H2009100574359E0000011.png"\; state="\{\{state\}\}">V</figure-callout>}}_2=-r*{\mathrm{\&omega;}}_2*\sin ({\mathrm{\&omega;}}_{2}t+\mathrm{\&pi;})& T_1\&le;t<T\end{array}\right..$

Express the rugged range degree of non-sinusoidal cuve among the present invention with deviation proportion:

α＝ΔT/T/4＝4*ΔT/T，

Wherein: Δ T=T/ (2-T ₁), the summit of non-sinusoidal cuve with deviation angle with sinusoidal wave summit of cycle is:

$\mathrm{\&Delta;\&theta;}=\frac{\mathrm{\&Delta;T}}{T}*2\mathrm{\&pi;}=\mathrm{\&pi;}/2*\mathrm{\&alpha;}.$

Among the present invention,

$\mathrm{\&omega;}=\left\{\begin{array}{cc}{\mathrm{\&omega;}}_1=\mathrm{\&pi;}/T_1& 0\&le;t<T_1\\ {\mathrm{\&omega;}}_2=1/2{\mathrm{<figure-callout\; id="2"\; label="Kt"\; filenames="H2009100574359E0000011.png"\; state="\{\{state\}\}">Kt</figure-callout>}}^2+\mathrm{\&epsiv;t}+\mathrm{\&pi;}/T_1& T_1\&le;t<T\end{array}\right.;$

K＝192*π*2f ³/(1-α)*(1+α) ³；

ε＝-48π*αf ²/(1-α)*(1+α) ²；

α＝4/(2-T ₁)；

Traditional vibration mode is difficult to realize above ω ₁With ω ₂Between transformation, main cause is will produce great acceleration in the transition process, and plant equipment is impacted, and rotary inertia is crossed ambassador's transition process and is difficult to finish in the time that requires.In the vibration of the present invention, shake table is to approach uniform motion when rising, and is sinusoidal motion when descending, and does not have saltus step continuously at A point and B point place angular speed curve, both can satisfy non-sinusoidal oscillation, can avoid generation equipment to impact again.

Frequency of the present invention is got 2.8Hz, and deviation proportion α gets 0.25, and its curve movement as shown in Figure 6; Frequency is got 3.2Hz, and deviation proportion α gets 0.01, and its curve movement as shown in Figure 7.

In sum, the present invention simplifies the transmission system of continuous cast mold vibration generating arrangement greatly, and structure is compacter, must not change other frame for movements of present traditional mould vibration device, directly drive electric rotating machine as long as by the one direction running, greatly prolong service life, and overall structure has that bearing capacity is big, anti-impact force is strong, high reliability.

Claims (3)

1. one kind directly drives crystallizer vibration generator device, the involving vibrations platform, described shake table is connected on the eccentric part of eccentric shaft by connecting rod, a drive unit drives the eccentric shaft rotation makes described shake table vibrate, it is characterized in that, described drive unit comprises the direct driving motor of a slow-speed of revolution, high pulling torque, and the rotating shaft of described direct driving motor and the central shaft of described eccentric shaft are rigidly connected, and the rotating speed of described direct driving motor is controlled in real time by a control device.

2. direct driving crystallizer vibration generator device according to claim 1 is characterized in that, described direct driving motor is the permanent excitation magnetic synchronization motor of multipole logarithm.

3. method for oscillating that adopts the direct driving crystallizer that direct driving crystallizer vibration generator device as claimed in claim 1 or 2 realizes, it is characterized in that, described control device control direct driving motor drives described eccentric shaft and rotates, and the rotational angular ω of described direct driving motor is:

$\mathrm{\&omega;}=\left\{\begin{array}{cc}\mathrm{\&pi;}/T_1& 0\&le;t\&le;T_1\\ 1/2{\mathrm{Kt}}^2+\mathrm{\&epsiv;t}+\mathrm{\&pi;}/T_1& T_1\&le;t<T\end{array}\right.;$

K＝192*π*2f ³/(1-α)*(1+α) ³；

ε＝-48π*αf ²/(1-α)*(1+α) ²；

α＝4/(2-T ₁)；

Wherein, T is the vibration period, T ₁Be decline cycle, f is a frequency, and t is the time.

Images