CN103192044A - Drive load control method and drive load control device for drawing roller - Google Patents
Drive load control method and drive load control device for drawing roller Download PDFInfo
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- CN103192044A CN103192044A CN2013101381129A CN201310138112A CN103192044A CN 103192044 A CN103192044 A CN 103192044A CN 2013101381129 A CN2013101381129 A CN 2013101381129A CN 201310138112 A CN201310138112 A CN 201310138112A CN 103192044 A CN103192044 A CN 103192044A
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Abstract
An embodiment of the invention provides a drive load control method and a drive load control device for a drawing roller of a conticaster. The method includes acquiring output torque by calculating motor parameters of the motor from the vector control frequency conversion device of the motor of each drawing roller of the conticaster; calculating real drawing power of each motor, summing real drawing power of all motors, and acquiring total real drawing power of the motors; distributing set drawing power to each motor from the total real drawing power of the motors according to set load distributing index of each motor; and controlling the real drawing power of a closed-cycle control motor of a frequency conversion device through vectors to be equal to the set drawing power for each motor. The drawing roller load can be flexibly adjusted through the drive load control method and the drive load control device.
Description
Technical field
The invention belongs to the conticaster technical field, relate in particular to a kind of transmission duty control method and device of throwing roller of conticaster.
Background technology
Straightening machine or fan-shaped section are nucleus equipments important in bloom and the slab caster, and its main effect is by the throwing roller of straightening machine or fan-shaped section continuous casting billet to be pulled out from crystallizer, the arc strand is aligned, and worn and send dummy bar.
Under common condition of work, each throwing roller rotating speed basically identical, it is in a basic balance to load.Here load refers to the throwing power to strand that the throwing roller forms.Sending under dummy ingot or some operating mode, producing fluctuation because the variation of throwing pressure causes the load of each throwing roller, because the fluctuation time is short and amplitude is little, so can disregard.But some occasion then needs to guarantee load balancing.
Fig. 1 shows a kind of scheme of the transmission load balancing of the throwing roller of realizing conticaster, and this scheme is to have adopted the softening principle of transmission device speed to realize load balancing.In actual production process, the actual linear velocity of the throwing roller that resistance of billet withdrawal is big can be less than the linear velocity of setting, produce speed difference Δ Vi between its actual linear velocity and the setting linear velocity, Δ Vi is by the integral action of frequency converter, its value increases gradually, by the softening function piece, exports a little compensation rate Δ Vseti, thereby reduce the actual set value of frequency converter, the value after the reduction is Vrefi=Vref-Δ Vseti.This moment, Vrefi can be more near the linear velocity of actual throwing, and load torque also can reduce gradually.
When utilizing the straightening machine to implement gently to depress, throwing roller place resistance of billet withdrawal increases sharply, and because each roller drafts non-uniform Distribution, each throwing roller is exerted oneself and is not waited.If adopt above-described load balancing control scheme of the prior art, the load of each straightening machine can not satisfy the requirement that in fact needed throwing roller load is adjusted flexibly with basic identical.
Summary of the invention
In view of this, the object of the present invention is to provide transmission duty control method and the device of the throwing roller of conticaster, can adjust the load of throwing roller flexibly.
For achieving the above object, one embodiment of the present of invention provide a kind of transmission duty control method of throwing roller of conticaster, comprising:
The Vector Control Frequency Conversion device of the motor of each the throwing roller from conticaster obtains the output torque of motor, and the output torque of described motor is that the vector converter device of this motor calculates according to the parameter of electric machine of this motor;
Calculate the actual throwing power of each motor, and to the actual throwing of all motors make every effort to and, obtain the total actual throwing power of all motors;
The sharing of load coefficient of setting with each motor distributes the throwing power of setting as weight for each motor in the total actual throwing power of all motors;
Actual throwing power by Vector Control Frequency Conversion device closed-loop control motor equals the throwing power set for this motor.
Preferably, the actual throwing power specific implementation of described each motor of calculating is:
Calculate the actual throwing power Facti of i motor by formula F acti=Ti*Gr/Ri;
Wherein, Ti is the actual torque of i motor, and Gr is the speed reducing ratio of motor reducer, and Ri is the radius of i throwing roller.
Preferably, the described throwing power specific implementation of setting for each motor distribution in total throwing power of all motors is:
Calculate the setting throwing power Fi of i motor by formula F i=(∑ Facti) * Kfi/ (∑ Kfi);
Wherein, Kfi is the sharing of load coefficient of i motor, and ∑ is represented summation operation.
Preferably, the sharing of load coefficient of each motor is in the interval of [1,1].
Another embodiment of the present invention also provides a kind of transmission load control unit of throwing roller of conticaster, comprising:
Output torque deriving means is used for the output torque of obtaining motor from the Vector Control Frequency Conversion device of the motor of each throwing roller of conticaster, and the output torque of described motor is that the vector converter device of this motor calculates according to the parameter of electric machine of this motor;
Throwing power computing unit be used for to calculate the actual throwing power of each motor, and to the actual throwing of all motors make every effort to and, obtain the total actual throwing power of all motors;
Set throwing power allocation units, the sharing of load coefficient that is used for setting with each motor is as weight, in the total actual throwing power of all motors, for each motor distributes the throwing power of setting, equal the throwing power of setting for this motor with the actual throwing power by Vector Control Frequency Conversion device closed-loop control motor.
According to the embodiment of the invention, can regulate separately the throwing power of each motor, thereby according to technological requirement the load of the throwing roller of conticaster be regulated arbitrarily, throwing power is equated, throwing power is not waited, and the adjustment scheme is very flexible.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a kind of scheme schematic diagram of transmission load balancing of the throwing roller of realization conticaster of the prior art;
Fig. 2 is the schematic diagram of the transmission duty control method provided by the invention conticaster control system of relying on;
Fig. 3 is the schematic diagram of transmission duty control method of the throwing roller of conticaster provided by the invention.
The specific embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
One embodiment of the invention provides a kind of transmission duty control method of throwing roller of conticaster, and Fig. 2 shows the conticaster control system that this control method operation relies on, and Fig. 3 shows the flow chart of this transmission duty control method.Please be simultaneously referring to Fig. 2 and Fig. 3, this method comprises the steps:
Step S301: the Vector Control Frequency Conversion device of the motor of each the throwing roller from conticaster, the output torque of obtaining motor.
In the present embodiment, each throwing roller has its corresponding motor, and each motor is controlled by corresponding Vector Control Frequency Conversion device again, and the vector converter device of each motor can record the parameter of electric machine of the motor of its control, and by motor mathematical model, calculate the output torque of motor.
Step S302: calculate the actual throwing power of each motor, and to the actual throwing of all motors make every effort to and, obtain the total actual throwing power of all motors.
According to the relation of power and moment, calculate the actual throwing power of each motor and can specifically calculate by following formula:
Facti=Ti*Gr/Ri
Wherein, Facti is the actual throwing power of i motor, and Ti is the actual torque of i motor, and Gr is the speed reducing ratio of motor reducer, and Ri is the radius of i throwing roller.
Like this, the total actual throwing power of all motors just can be calculated by following formula:
Total actual throwing power=∑ Facti
Step S303: the sharing of load coefficient of setting with each motor distributes the throwing power of setting as weight for each motor in the total actual throwing power of all motors.
In total throwing power of all motors, for distributing the throwing power of setting, can specifically realize by following formula by each motor:
Fi=(∑Facti)*Kfi/(∑Kfi)
Wherein, Fi is the setting throwing power of i motor, and Kfi is the sharing of load coefficient of i motor, and ∑ is represented summation operation.
Here, the sharing of load coefficient of each motor can be in the interval of [1,1].
Step S304: by the Vector Control Frequency Conversion device, adopt the mode of closed loop, the actual throwing power of control motor equals the throwing power that this motor is set.
Can regulate separately the throwing power of each motor by the method in the embodiment of the invention thus, thereby according to technological requirement the load of the throwing roller of conticaster be regulated arbitrarily, throwing power is equated, throwing power is not waited.
For example in actual production, for some special steel grade, for improving pulling rate and reducing the probability of casting billet surface generation crackle, need take to compress foundry engieering.Namely the throwing roller before strand aligning point is implemented normal throwing, gives the certain forward thrust of strand; The throwing roller is implemented braking to the strand behind the aligning point, gives the certain propulsive thrust of strand, makes strand be in pressured state in the aligning district.Therefore the control method that provides by present embodiment can realize that the load of throwing roller freely distributes, the demand of convenient various application scenarios, sharing of load coefficient that only need each motor of adjustment.
In addition, the embodiment of the invention also provides a kind of transmission load control unit of throwing roller of conticaster, and this device comprises:
Output torque deriving means is used for the output torque of obtaining motor from the Vector Control Frequency Conversion device of the motor of each throwing roller of conticaster, and the output torque of described motor is that the vector converter device of this motor calculates according to the parameter of electric machine of this motor;
Throwing power computing unit be used for to calculate the actual throwing power of each motor, and to the actual throwing of all motors make every effort to and, obtain the total actual throwing power of all motors;
Set throwing power allocation units, the sharing of load coefficient that is used for setting with each motor is as weight, in the total actual throwing power of all motors, for each motor distributes the throwing power of setting, equal the throwing power of setting for this motor with the actual throwing power by Vector Control Frequency Conversion device closed-loop control motor.
The above only is preferred embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. the transmission duty control method of the throwing roller of a conticaster is characterized in that,
The Vector Control Frequency Conversion device of the motor of each the throwing roller from conticaster obtains the output torque of motor, and the output torque of described motor is that the vector converter device of this motor calculates according to the parameter of electric machine of this motor;
Calculate the actual throwing power of each motor, and to the actual throwing of all motors make every effort to and, obtain the total actual throwing power of all motors;
The sharing of load coefficient of setting with each motor distributes the throwing power of setting as weight for each motor in the total actual throwing power of all motors;
Actual throwing power by Vector Control Frequency Conversion device closed-loop control motor equals the throwing power set for this motor.
2. method according to claim 1 is characterized in that, the actual throwing power specific implementation of described each motor of calculating is:
Calculate the actual throwing power Facti of i motor by formula F acti=Ti*Gr/Ri;
Wherein, Ti is the actual torque of i motor, and Gr is the speed reducing ratio of motor reducer, and Ri is the radius of i throwing roller.
3. method according to claim 2 is characterized in that, the described throwing power specific implementation of setting for each motor distribution in total throwing power of all motors is:
Calculate the setting throwing power Fi of i motor by formula F i=(∑ Facti) * Kfi/ (∑ Kfi);
Wherein, Kfi is the sharing of load coefficient of i motor, and ∑ is represented summation operation.
4. method according to claim 3 is characterized in that, the sharing of load coefficient of each motor is in the interval of [1,1].
5. the transmission load control unit of the throwing roller of a conticaster is characterized in that,
Output torque deriving means is used for the output torque of obtaining motor from the Vector Control Frequency Conversion device of the motor of each throwing roller of conticaster, and the output torque of described motor is that the vector converter device of this motor calculates according to the parameter of electric machine of this motor;
Throwing power computing unit be used for to calculate the actual throwing power of each motor, and to the actual throwing of all motors make every effort to and, obtain the total actual throwing power of all motors;
Set throwing power allocation units, the sharing of load coefficient that is used for setting with each motor is as weight, in the total actual throwing power of all motors, for each motor distributes the throwing power of setting, equal the throwing power of setting for this motor with the actual throwing power by Vector Control Frequency Conversion device closed-loop control motor.
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| CN2013101381129A CN103192044A (en) | 2013-04-19 | 2013-04-19 | Drive load control method and drive load control device for drawing roller |
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| CN2013101381129A CN103192044A (en) | 2013-04-19 | 2013-04-19 | Drive load control method and drive load control device for drawing roller |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104001886A (en) * | 2014-05-12 | 2014-08-27 | 中冶南方工程技术有限公司 | Continuous-casting withdrawal and straightening unit system and load distributing method |
| CN106111929A (en) * | 2016-07-25 | 2016-11-16 | 江苏联峰能源装备有限公司 | A kind of round billet continuous casting straightening motor load dynamically distributes control system and control method thereof |
| CN113523214A (en) * | 2021-06-18 | 2021-10-22 | 首钢集团有限公司 | Slab throwing force distribution method for continuous casting high-reduction process |
| CN114135443A (en) * | 2020-09-04 | 2022-03-04 | 纳博特斯克有限公司 | Output device and method, state monitoring device and method, and wind turbine |
| CN114135443B (en) * | 2020-09-04 | 2024-05-17 | 纳博特斯克有限公司 | Output device and method, state monitoring device and method, and windmill |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104001886A (en) * | 2014-05-12 | 2014-08-27 | 中冶南方工程技术有限公司 | Continuous-casting withdrawal and straightening unit system and load distributing method |
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| CN106111929A (en) * | 2016-07-25 | 2016-11-16 | 江苏联峰能源装备有限公司 | A kind of round billet continuous casting straightening motor load dynamically distributes control system and control method thereof |
| CN114135443A (en) * | 2020-09-04 | 2022-03-04 | 纳博特斯克有限公司 | Output device and method, state monitoring device and method, and wind turbine |
| CN114135443B (en) * | 2020-09-04 | 2024-05-17 | 纳博特斯克有限公司 | Output device and method, state monitoring device and method, and windmill |
| CN113523214A (en) * | 2021-06-18 | 2021-10-22 | 首钢集团有限公司 | Slab throwing force distribution method for continuous casting high-reduction process |
| CN113523214B (en) * | 2021-06-18 | 2022-09-09 | 首钢集团有限公司 | Slab throwing force distribution method for continuous casting high-reduction process |
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