CN105586493A - Position detection and control method for consumable electrode of electric slag furnace - Google Patents

Abstract

The invention discloses a position detection and control method for a consumable electrode of an electric slag furnace. The position detection and control method for the consumable electrode of the electric slag furnace comprises the following steps that firstly, a numerical simulation model is established through a finite element method; secondly, the temperature of the top end of the consumable electrode is detected in real time through a temperature sensor, and the heat current at the top end of the consumable electrode is detected in real time through a heat current sensor; thirdly, the position of the consumable electrode is calculated through a particle swarm optimization algorithm; fourthly, a position curve of the consumable electrode is displayed and recorded; and fifthly, the position of the consumable electrode is adjusted in real time. According to the position detection and control method for the consumable electrode of the electric slag furnace, the steps are simple, using is convenient, and the input cost is low; the position of the consumable electrode of the electric slag furnace is tracked rapidly, and the control precision is high; when the electrode is aligned to the furnace by an operator, the actual position numerical value of the electrode is directly displayed through a displayer, watching before the furnace and practical manual box alignment are not needed, and the casting quality and the production efficiency are improved.

Description

A kind of position probing of electroslag furnace consutrode and control method

Technical field

The present invention relates to electroslag remelting industrial circle, especially relate to a kind of position of electroslag furnace consutrodePut Detection & Controling method.

Background technology

In ESR Process, the electric energy to casting quality, consumption and production efficiency have the greatest impactLink is the control to electrode. Due to the carrying out along with fusing, electrode constantly shortens and steel ingot is gone up graduallyRise, in order to ensure that molten speed and current stabilization need real-time adjusting electrode height in setting value. If electrodeDecrease speed is excessively slow, can produce arc discharge, and current fluctuation is very large, and Electroslag Process is destroyed; If electricUtmost point decrease speed is too fast, will cause the short circuit phenomenon of electrode and metal bath. Thereby electrode position controlSystem is an important control parameter in reflow process, is also the requisite control loops of all electroslag furnacesJoint.

The solid-liquid interface forming in fusion process due to electroslag furnace consutrode bottom cannot be straightConnect measurement, cause consutrode position to be difficult to accurately judgement. Traditional consutrode position control method,Have plenty of by operating personnel and watch in stokehold with actual hands-on case is completed, have plenty of employingThe autocontrol method of controlling based on conventional PID, the employing fuzzy control having replace conventional PID to control,But all cannot reach rapid tracking, the object of accurately controlling.

Summary of the invention

Technical problem to be solved by this invention is, for above-mentioned deficiency of the prior art, to provide onePosition probing and the control method of planting electroslag furnace consutrode, its step is simple and easy to use, can be rightConsutrode current location is carried out real-time tracking and is automatically regulated.

For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of electroslag furnace consutrodePosition probing and control method, it is characterized in that, comprise the following steps:

Step 1, sets up numerical simulation model: the fusion process of electroslag furnace consutrode is that a heat passesLead problem, first the differential equation of heat conduction problem is carried out to discretization, then at given boundary conditionLower employing FInite Element solves the described differential equation, thereby sets up numerical simulation model; DescribedThe input quantity of numerical simulation model is the position of the solid-liquid interface that produces in comsumable melt processPut, and its output quantity is the heat flow value of melting solid part end not; The described differential equation is:

In formula, T is the temperature field of its solid portion of solid material in melting process; When t isBetween, x is solid portion length;

Program corresponding to described numerical simulation model writes processor by keyboard, and described processor is by instituteState numerical simulation model and deposit in memory, described processor respectively with described keyboard and memory phaseConnect;

Step 2, signals collecting and processing: adopt temperature sensor to enter the temperature on consutrode topRow detects in real time; Adopt heat flow transducer to detect in real time the hot-fluid on consutrode top; DescribedTemperature sensor and heat flow transducer are transferred to filter circuit by the temperature detecting and hot-fluid respectively, filterWave circuit carries out described temperature and heat flow signal to transmit through signal isolation circuit after bandpass filtering treatmentGive analog-digital converter, described in analog-digital converter is transferred to the signal receiving after analog-to-digital conversion processProcessor; Described temperature sensor and heat flow transducer all join with filter circuit, described filter circuit,Signal isolation circuit, analog-digital converter and processor join successively; Install on the top of described consutrodeHave clamper, described temperature sensor and heat flow transducer are installed on described clamper;

Step 3, consutrode position calculation: artificial circuit module is by calling in described memoryNumerical simulation model obtains hot-fluid simulation value, and processor detects heat flow transducer the actual hot-fluid obtainingValue and described hot-fluid simulation value, as input signal, adopt optimized algorithm to count described input signalCalculate and export the solid-liquid interface position signalling forming after the bottom fusing of described consutrode; Described excellentThe object function of changing algorithm employing is:

$J={\left|\right|y_1-y_2\left|\right|}^2+k{\left|\right|\frac{\mathrm{ds}}{\mathrm{dt}}\left|\right|}^2$

In formula, y₁For the measured value of hot-fluid, y₂For the simulation value of hot-fluid, s is consutrode solid liquid phaseBecome interface location, k is adjustment factor;

Described artificial circuit module is joined with memory and processor respectively;

Step 4, consutrode position curve shows and record: described processor is by described solid-liquid phase changeThe position curve at interface shows in real time on display, and prints with for future reference by printerAsk; Described display and printer all join with described processor;

Step 5, consutrode position is adjusted in real time: described processor is by described consutrode solid liquid phaseBecome interface location signal real-time Transmission to controller, controller drives frequency converter according to described position signallingWork, frequency converter is controlled the rotating speed of lifting motor, and lifting motor drives described consutrode to doElevating movement, until be positioned at correct position; Described processor, controller, frequency converter and lifting motorJoin successively, described lifting motor is connected by turn-screw with described clamper.

The position probing of above-mentioned a kind of electroslag furnace consutrode and control method, is characterized in that: described excellentChange algorithm is particle swarm optimization algorithm.

The position probing of above-mentioned a kind of electroslag furnace consutrode and control method, is characterized in that: described tuneThe value of joint coefficient k is 0.3.

The position probing of above-mentioned a kind of electroslag furnace consutrode and control method, is characterized in that: described placeReason device is the embedded microprocessor that inside is integrated with solid-liquid interface position tracking software.

The position probing of above-mentioned a kind of electroslag furnace consutrode and control method, is characterized in that: described controlDevice processed is PLC.

The present invention compared with prior art has the following advantages: step is simple, easy to use, drop into intoThis is low; To electroslag furnace consutrode position follow the tracks of rapidly, control accuracy is high; Operator is at electrode pair stoveTime, display directly demonstrates electrode physical location numerical value, without grasping with actual starting soon in stokeholdDo case, improved casting quality and production efficiency.

Below by drawings and Examples, technical scheme of the present invention is described in further detail.

Brief description of the drawings

Fig. 1 is flow chart of the present invention.

Detailed description of the invention

As shown in Figure 1, the present invention includes following steps:

Step 1, sets up numerical simulation model: the fusion process of electroslag furnace consutrode is that a heat passesLead problem, first the differential equation of heat conduction problem is carried out to discretization, then at given boundary conditionLower employing FInite Element solves the described differential equation, thereby sets up numerical simulation model; DescribedThe input quantity of numerical simulation model is the position of the solid-liquid interface that produces in comsumable melt processPut, and its output quantity is the heat flow value of melting solid part end not; The described differential equation is:

In formula, T is the temperature field of its solid portion of solid material in melting process; When t isBetween, x is solid portion length;

Program corresponding to described numerical simulation model writes processor by keyboard, and described processor is by instituteState numerical simulation model and deposit in memory, described processor respectively with described keyboard and memory phaseConnect;

Step 2, signals collecting and processing: adopt temperature sensor to enter the temperature on consutrode topRow detects in real time; Adopt heat flow transducer to detect in real time the hot-fluid on consutrode top; DescribedTemperature sensor and heat flow transducer are transferred to filter circuit by the temperature detecting and hot-fluid respectively, filterWave circuit carries out described temperature and heat flow signal to transmit through signal isolation circuit after bandpass filtering treatmentGive analog-digital converter, described in analog-digital converter is transferred to the signal receiving after analog-to-digital conversion processProcessor; Described temperature sensor and heat flow transducer all join with filter circuit, described filter circuit,Signal isolation circuit, analog-digital converter and processor join successively; Install on the top of described consutrodeHave clamper, described temperature sensor and heat flow transducer are installed on described clamper;

Step 3, consutrode position calculation: artificial circuit module is by calling in described memoryNumerical simulation model obtains hot-fluid simulation value, and processor detects heat flow transducer the actual hot-fluid obtainingValue and described hot-fluid simulation value, as input signal, adopt optimized algorithm to count described input signalCalculate and export the solid-liquid interface position signalling forming after the bottom fusing of described consutrode; Described excellentThe object function of changing algorithm employing is:

$J={\left|\right|y_1-y_2\left|\right|}^2+k{\left|\right|\frac{\mathrm{ds}}{\mathrm{dt}}\left|\right|}^2$

In formula, y₁For the measured value of hot-fluid, y₂For the simulation value of hot-fluid, s is consutrode solid liquid phaseBecome interface location, k is adjustment factor;

Described artificial circuit module is joined with memory and processor respectively;

Step 4, consutrode position curve shows and record: described processor is by described solid-liquid phase changeThe position curve at interface shows in real time on display, and prints with for future reference by printerAsk; Described display and printer all join with described processor;

Step 5, consutrode position is adjusted in real time: described processor is by described consutrode solid liquid phaseBecome interface location signal real-time Transmission to controller, controller drives frequency converter according to described position signallingWork, frequency converter is controlled the rotating speed of lifting motor, and lifting motor drives described consutrode to doElevating movement, until be positioned at correct position; Described processor, controller, frequency converter and lifting motorJoin successively, described lifting motor is connected by turn-screw with described clamper.

In the present embodiment, described optimized algorithm is particle swarm optimization algorithm.

In the present embodiment, the value of described adjustment factor k is 0.3.

In the present embodiment, described processor is that inside is integrated with solid-liquid interface position tracking softwareEmbedded microprocessor.

In the present embodiment, described controller is PLC.

The above, be only preferred embodiment of the present invention, not the present invention imposed any restrictions, everyAny simple modification, change and the equivalent structure above embodiment done according to the technology of the present invention essenceChange, all still belong in the protection domain of technical solution of the present invention.

Claims (5)

1. the position probing of electroslag furnace consutrode and a control method, is characterized in that, comprise withLower step:

Step 1, sets up numerical simulation model: the fusion process of electroslag furnace consutrode is that a heat passesLead problem, first the differential equation of heat conduction problem is carried out to discretization, then at given boundary conditionLower employing FInite Element solves the described differential equation, thereby sets up numerical simulation model; DescribedThe input quantity of numerical simulation model is the position of the solid-liquid interface that produces in comsumable melt processPut, and its output quantity is the heat flow value of melting solid part end not; The described differential equation is:

In formula, T is the temperature field of its solid portion of solid material in melting process; When t isBetween, x is solid portion length;

Program corresponding to described numerical simulation model writes processor by keyboard, and described processor is by instituteState numerical simulation model and deposit in memory, described processor respectively with described keyboard and memory phaseConnect;

Step 2, signals collecting and processing: adopt temperature sensor to enter the temperature on consutrode topRow detects in real time; Adopt heat flow transducer to detect in real time the hot-fluid on consutrode top; DescribedTemperature sensor and heat flow transducer are transferred to filter circuit by the temperature detecting and hot-fluid respectively, filterWave circuit carries out described temperature and heat flow signal to transmit through signal isolation circuit after bandpass filtering treatmentGive analog-digital converter, described in analog-digital converter is transferred to the signal receiving after analog-to-digital conversion processProcessor; Described temperature sensor and heat flow transducer all join with filter circuit, described filter circuit,Signal isolation circuit, analog-digital converter and processor join successively; Install on the top of described consutrodeHave clamper, described temperature sensor and heat flow transducer are installed on described clamper;

Step 3, consutrode position calculation: artificial circuit module is by calling in described memoryNumerical simulation model obtains hot-fluid simulation value, and processor detects heat flow transducer the actual hot-fluid obtainingValue and described hot-fluid simulation value, as input signal, adopt optimized algorithm to count described input signalCalculate and export the solid-liquid interface position signalling forming after the bottom fusing of described consutrode; Described excellentThe object function of changing algorithm employing is:

$J={\left|\right|y_1-y_2\left|\right|}^2+k{\left|\right|\frac{\mathrm{ds}}{\mathrm{dt}}\left|\right|}^2$

In formula, y₁For the measured value of hot-fluid, y₂For the simulation value of hot-fluid, s is consutrode solid liquid phaseBecome interface location, k is adjustment factor;

Described artificial circuit module is joined with memory and processor respectively;

Step 4, consutrode position curve shows and record: described processor is by described solid-liquid phase changeThe position curve at interface shows in real time on display, and prints with for future reference by printerAsk; Described display and printer all join with described processor;

Step 5, consutrode position is adjusted in real time: described processor is by described consutrode solid liquid phaseBecome interface location signal real-time Transmission to controller, controller drives frequency converter according to described position signallingWork, frequency converter is controlled the rotating speed of lifting motor, and lifting motor drives described consutrode to doElevating movement, until be positioned at correct position; Described processor, controller, frequency converter and lifting motorJoin successively, described lifting motor is connected by turn-screw with described clamper.

2. according to the position probing of a kind of electroslag furnace consutrode claimed in claim 1 and controlling partyMethod, is characterized in that: described optimized algorithm is particle swarm optimization algorithm.

3. according to position probing and the control of a kind of electroslag furnace consutrode described in claim 1 or 2Method, is characterized in that: the value of described adjustment factor k is 0.3.

4. according to position probing and the control of a kind of electroslag furnace consutrode described in claim 1 or 2Method, is characterized in that: described processor is that inside is integrated with solid-liquid interface position tracking softwareEmbedded microprocessor.

5. according to position probing and the control of a kind of electroslag furnace consutrode described in claim 1 or 2Method, is characterized in that: described controller is PLC.