CN106363030A - Impedance measurement-based PC steel bar electric induction excitation frequency control apparatus and method - Google Patents
Impedance measurement-based PC steel bar electric induction excitation frequency control apparatus and method Download PDFInfo
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- CN106363030A CN106363030A CN201610701868.3A CN201610701868A CN106363030A CN 106363030 A CN106363030 A CN 106363030A CN 201610701868 A CN201610701868 A CN 201610701868A CN 106363030 A CN106363030 A CN 106363030A
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- reinforcing bar
- impedance
- impedance measurement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/02—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C9/00—Cooling, heating or lubricating drawing material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Induction Heating (AREA)
Abstract
The invention discloses an impedance measurement-based PC steel bar electric induction excitation frequency control apparatus and method. The apparatus comprises a wire drawing machine arranged on a steel bar conveyor belt, a heating red copper tube is also arranged on the steel bar conveyor belt, and the upstream and the downstream of the heating red copper tube are respectively provided with current vortex impedance measurement devices with the same structure; the impedance output ends of the two current vortex impedance measurement devices are respectively connected with the two impedance input ends of a controller, the current vortex impedance measurement devices respectively transmit the impedance values of steel bars before and after heating to the controller, and the controller controls the excitation frequency of a heating red copper tube induction power supply. The apparatus and the method have the advantages of guaranteeing of the steel bar heating temperature and the heating temperature uniformity of the steel bars of the heating red copper tube, improvement of the steel bar rolling quality, high heating efficiency, simplicity and convenience in the whole steel bar rolling process, and reliability in running.
Description
Technical field
The present invention relates to and structural steel defect detecting device, specifically a kind of based on impedance measurement pc reinforcing bar electricity
Excitation induced frequency control apparatus and method.
Background technology
Hot rolled ribbed bars are through the cold rolling tube reducing of multiple tracks, pressure rib formation after elimination internal stress together with gren rod
One kind carries the meniscate reinforcing bar in two faces or three faces, to increase the gripping force with concrete, is the most frequently used in civil construction project
One of steel.Specify in technical standard gb1499-91 of China's existing production reinforcing bar, steel grade is 20mnsi, commonly uses outlet
The intensity of level reinforcing bar is 590mpa, and most domestic is level reinforcing bar, and intensity only has 460mpa, abroad widely uses Surge chamber high
Intensity steel, i.e. pc recessed screw thread reinforcing bar, intensity 1420mpa, it is used for below 60m Bases in High Building Construction column, abutment column, pipe
Stake, and railroad sleeper etc..Prestressed concrete is directly used in steel wire, and in pc Steel Wire Surface indentation in addition.
In hot rolled ribbed bars production procedure, a sensing heating only extremely important link, sensing heating is easy to form
Production line, realizes mechanization production.Pc reinforcing bar synchronous driving.Power adjust, temperature control, blowing with batch, all can concentrate
In operating board control operation.The topmost technical parameter of induction heating technology is supply frequency.
At present, the performance of China's electric elements is not also very stable, and inductance capacitance coupling is difficult to keep transporting in the best condition
OK, in hot rolled ribbed bars production procedure sensing heating FREQUENCY CONTROL, also be mainly according to power-adjusting power supply driving frequency,
Due to the Kelvin effect of sensing heating, hot rolled ribbed bars quickly continuously produce afterwards in addition, easily cause reinforcing bar in sensing heating
During temperature field uneven, affect follow-up rolling process, lead to the mechanical property of hot rolled ribbed bars product to reduce.
Content of the invention
For the problems referred to above, the invention provides a kind of pc reinforcing bar electric induction driving frequency based on impedance measurement controls dress
Put and method, copper tube upstream and downstream pc reinforcing bar resistance value is heated by Real-time Collection, revise swashing of heating copper tube in real time
Encourage frequency it is ensured that heating copper tube temperature that reinforcing bar heat, it is ensured that reinforcing bar internal and external temperature uniformity, improves reinforcing bar and rolls matter
Amount.
For reaching above-mentioned purpose, the concrete technical scheme that the present invention adopts is as follows:
A kind of pc reinforcing bar electric induction driving frequency control device based on impedance measurement, including being arranged on reinforcing bar conveyer belt
Wire drawing machine, it is critical only that: be additionally provided with heating copper tube on described reinforcing bar conveyer belt, described heating copper tube upper
Trip is respectively arranged with a consistent current vortex impedance measurement device of structure with downstream；
The impedance output of two described current vortex impedance measurement devices is connected with two impedance input of controller respectively
Connect, two described current vortex impedance measurement devices transmit the resistance value before reinforcing bar heating and after heating to described controller respectively,
Described controller also control described heating copper tube induction power supply driving frequency.
By above-mentioned design, under the drive of wire drawing machine, reinforcing bar is pulled to be driven on described reinforcing bar conveyer belt, described heating
The current vortex impedance measurement device of copper tube upstream detects the impedance of reinforcing bar, determines the initial excitation frequency of described heating copper tube
Rate, the reinforcing bar impedance after the current vortex impedance measurement device detection heating in described heating copper tube downstream, and calculate now steel
Driving frequency required for muscle, and the driving frequency of the setting of heating copper tube is revised in real time, to ensure the heating temperature of reinforcing bar
Degree and the uniformity of heating-up temperature, improve reinforcing bar rolling quality, and whole process need not artificially check the temperature of detection reinforcing bar, just
Enable the real-time detection to reinforcing bar rolling quality, simple and convenient, use manpower and material resources sparingly.
Further describe, described reinforcing bar conveyer belt is additionally provided with encoder, described encoder is also with described controller even
Connect, for measuring the transfer rate of reinforcing bar；Described controller is also connected with described wire drawing machine, for controlling drawing of described wire drawing machine
Silk speed；The downstream of described heating copper tube is additionally provided with Infrared Surface temperature-detecting device, described Infrared Surface temperature detection
Device is also connected with described controller, for transmitting rebar surface temperature data.
Using such scheme, described encoder real-time monitoring reinforcing bar transfer rate, and transfer rate is sent to control
Device, controller can control the drawing speed of wire drawing machine again, and whole speed controlling realizes feedback control；Infrared Surface temperature simultaneously
Temperature signal can be sent to controller by detection means in real time in real time, realize the monitoring of temperature real-time tracking it is ensured that heating copper tube
Heating actual temperature, occur damaging and the loss that causes to prevent from heating copper tube；Ensure that reinforcing bar in the reinforcing bar operation of rolling
Rolling temperature and speed, improve reinforcing bar rolling quality and rolling reliability.
Further describe, described current vortex impedance measurement device includes impedance-driven device, impedance probe, impedance survey
Amount device, the alternating current that described impedance-driven device generates drives described impedance probe to produce alternating magnetic field, thus in steel
Current vortex signal is produced on the reinforcing bar on muscle conveyer belt, described impedance measurement device produces current vortex signal according on reinforcing bar, real
When detect reinforcing bar resistance value, described impedance measurement device is connected with described controller, for transmitting reinforcing bar resistance value.
Using such scheme, impedance-driven device produce alternating driving voltages driving impedance detector produce exciting current from
And produce alternating magnetic field, produce current vortex signal in tested rebar surface, current vortex produces dynamic magnetic field, realize impedance probe
Detection to reinforcing bar resistance value, impedance measurement device realizes the transmission of resistance value, and whole process need not artificially participate in, convenient fast
Prompt.
Further describe, described impedance-driven device is alternation driving means, described impedance-driven device is included successively
The crystal oscillator of connection, digital frequency synthesizer, dac transducer, operational amplifier, the input termination of described crystal oscillator
Alternating current power supply, the alternating current outfan of described operational amplifier is connected with described impedance probe.
Using such scheme, crystal oscillator, digital frequency synthesizer and dac transducer produce the sinusoidal letter of certain frequency
Number, after power amplifier, driving impedance detector detects the impedance of reinforcing bar, easy to use, reliable.
Further describe, described impedance probe includes refractory ceramics skeleton and the excitation coil of helical structure, institute
State the refractory ceramics skeleton that reinforcing bar conveyer belt passes through helical structure, the spiral skeleton of described refractory ceramics skeleton is wound around
There is the alternating current outfan of described excitation coil, the ac power input end of described excitation coil and described impedance-driven device
Connect.
Using such scheme, refractory ceramics skeleton can be high temperature resistant, can simultaneously serve as the winding skeleton of excitation coil,
Excitation coil, under the driving of impedance-driven device, measures reinforcing bar resistance value, convenient and reliable.
Further describe, described impedance measurement device includes signal amplifier, the programmable automation controller being sequentially connected
Device, low pass filter, adc transducer, digital fourier transformation device, described digital fourier transformation device real part outfan with
Imaginary part outfan is all connected with described controller through integrated chip interface, the impedance signal input of described signal amplifier and institute
The impedance signal outfan stating impedance probe connects.
Using such scheme, when measuring reinforcing bar resistance value, need not artificially calculate and operate, it is possible to achieve the survey to impedance
Amount, and can realize resistance value real part imaginary part calculate it is achieved that monitoring to the reinforcing bar operation of rolling, real-time detection electric current oozes
Depth thoroughly, improves reinforcing bar rolling quality.
A kind of pc reinforcing bar electric induction driving frequency control method based on impedance measurement, comprises the following steps:
S1: initialization, makes n=1；
S2: described controller controls described wire drawing machine work, makes reinforcing bar start transmission on reinforcing bar conveyer belt, and obtains institute
State the upstream resistance value z of the current vortex impedance measurement device detection of heating copper tube upstream1=r1+jx1, and hindered according to this upstream
Anti- value calculates setting driving frequency f of described heating copper tuben-1, enter step s3；
S3: described controller (5) obtains current vortex impedance measurement device (4) detection in described heating copper tube (3) downstream
Downstream resistance value z2=r2+jx2, and this moment required excitation frequency of described heating copper tube (3) is calculated according to this downstream resistance value
Rate fn, wherein n=1,2,3 ..., enter step s4；
S4: calculate frequency increment δ f=fn-fn-1, and control setting driving frequency f of described heating copper tube (3)n-1=
fn, and make n=n+1, time delay m s, wherein, m >=0, enter step s5；
S5: judge whether wire drawing machine (2) quits work, if so, control and terminate；Otherwise return to step s3.
Using said method, according to the reinforcing bar resistance value of heating copper tube upstream detection for the first time, to confirm to heat red copper
The initial firing frequency of pipe, then further according to the resistance value of heating copper tube detected downstream, to revise heating copper tube in real time
Driving frequency, makes the reinforcing bar operation of rolling more reliable and more stable, improves the quality of reinforcing bar rolling.
Further describe, according to the method that resistance value seeks described heating copper tube driving frequency be:
A1: determine reinforcing bar radius r and electricalresistivityρ；
A2: according to formulaWith acquisition resistance value z=r+jx, try to achieve pcrmeabilityWith
Electrical conductivityWherein l is inductance value；
A3: according to formulaTry to achieve driving frequency f, δ is electric current penetration radius.
Using said method it is only necessary to measure the radius of reinforcing bar, you can according to the resistance value of measurement, calculate reinforcing bar resistance
Rate, electrical conductivity, pcrmeability, are more than or equal to reinforcing bar radius further according to electric current penetration radius, driving frequency are calculated.
Beneficial effects of the present invention: current vortex impedance measurement device is set on reinforcing bar rolling conveyer belt, in real time to reinforcing bar
Resistance value is detected, thus being controlled revising the driving frequency of heating copper tube it is ensured that heating copper tube is to reinforcing bar
Heating temperature, and the uniformity of heating-up temperature, improve reinforcing bar rolling quality；Encoder, controller, wire drawing simultaneously
Machine, reinforcing bar transmit process is formed closed loop, Real-time Feedback, adjustment reinforcing bar transfer rate；Whole process only needs to measure steel
The radius of muscle, you can by controller control with the driving frequency that calculates heating copper tube, the efficiency of heating surface is high, it is heated to improve
Reinforcing bar inside and outside Uniformity of Temperature Field, improves reinforcing bar rolling quality, makes the reinforcing bar operation of rolling, simple, convenient, reliable.
Brief description
Fig. 1 is the control device structural representation of the present invention；
Fig. 2 is the system control block figure of the present invention；
Fig. 3 is the current vortex impedance measurement device control block diagram of the present invention；
Fig. 4 is the control method control flow chart of the present invention.
In figure 1. reinforcing bar conveyer belt, 2. wire drawing machine, 3. heats copper tube, 4. current vortex impedance measurement device, 41. impedances are driven
Dynamic device, 41a. crystal oscillator, 41b. digital frequency synthesizer, 41c.dac transducer, 41d. operational amplifier, 42. impedances
Detector, 42a. refractory ceramics skeleton, 42b. excitation coil, 43. impedance measurement devices, 43a. signal amplifier, 43b. can
Programming gain amplifier, 43c. low pass filter, 43d.adc transducer, 43e. digital fourier transformation device, 43f. integrated chip
Interface, 5. controller, 6. encoder, 7. Infrared Surface temperature-detecting device.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment and operation principle of the present invention is described in further detail.
Can be seen that a kind of pc reinforcing bar electric induction driving frequency control device based on impedance measurement from Fig. 1 and Fig. 2, bag
Include the wire drawing machine 2 being arranged on reinforcing bar conveyer belt 1, heating copper tube 3 is additionally provided with reinforcing bar conveyer belt 1, in heating red copper
The upstream and downstream of pipe 3 is respectively arranged with a consistent current vortex impedance measurement device 4 of structure；Two current vortex impedance measurements
The impedance output of device 4 is connected with two impedance input of controller 5 respectively, 4 points of two current vortex impedance measurement devices
Do not transmit the resistance value before reinforcing bar heating and after heating to controller 5, controller 5 also controls heating copper tube 3 induction power supply
Driving frequency.
Can be seen that from Fig. 1 and Fig. 2 and encoder 6 is additionally provided with reinforcing bar conveyer belt 1, encoder 6 is also with controller 5 even
Connect, for measuring the transfer rate of reinforcing bar；Controller 5 is also connected with wire drawing machine 2, for controlling the drawing speed of wire drawing machine 2；Plus
The downstream of hot copper tube 3 is additionally provided with Infrared Surface temperature-detecting device 7, Infrared Surface temperature-detecting device 7 also with controller 5
Connect, for transmitting rebar surface temperature data.
From figure 3, it can be seen that current vortex impedance measurement device 4 includes impedance-driven device 41, impedance probe 42, impedance
Measurement apparatus 43, the alternating current driving impedance detector 42 that impedance-driven device 41 generates produces alternating magnetic field, thus in steel
On reinforcing bar on muscle conveyer belt 1 produce current vortex signal, impedance measurement device 43 according on reinforcing bar produce current vortex signal, in real time
Detection reinforcing bar resistance value, impedance measurement device 43 is connected with controller 5, for transmitting reinforcing bar resistance value.
From fig. 3 it can also be seen that impedance-driven device 41 is alternation driving means, impedance-driven device 41 includes connecting successively
The crystal oscillator 41a that connects, digital frequency synthesizer 41b, dac transducer 41c, operational amplifier 41d, crystal oscillator 41a
Input termination alternating current power supply, the alternating current outfan of operational amplifier 41d is connected with impedance probe 42.
From fig. 3 it can also be seen that impedance probe 42 includes refractory ceramics skeleton 42a and the excitation coil of helical structure
42b, reinforcing bar conveyer belt 1 passes through the refractory ceramics skeleton 42a of helical structure, in the spiral skeleton of refractory ceramics skeleton 42a
On be wound with excitation coil 42b, the alternating current output of the ac power input end of excitation coil 42b and impedance-driven device 41
End connects.
From fig. 3 it can also be seen that impedance measurement device 43 includes signal amplifier 43a, the programmable-gain being sequentially connected
Amplifier 43b, low pass filter 43c, adc transducer 43d, digital fourier transformation device 43e, in digital fourier transformation device
The real part outfan of 43e is all connected with controller 5 through integrated chip interface 43f with imaginary part outfan, the resistance of signal amplifier 43a
Antinoise signal input is connected with the impedance signal outfan of impedance probe 42.
From fig. 4, it can be seen that a kind of pc reinforcing bar electric induction driving frequency based on impedance measurement as claimed in claim 2 controls
Method, comprises the following steps:
S1: initialization, makes n=1；
S2: controller 5 controls wire drawing machine 2 to work, and makes reinforcing bar start transmission on reinforcing bar conveyer belt 1, and it is purple to obtain heating
The upstream resistance value z of current vortex impedance measurement device 4 detection of copper pipe 3 upstream1=r1+jx1, and according to this upstream resistance value meter
Calculate setting driving frequency f of heating copper tube 3n-1, enter step s3；
S3: controller 5 obtains the downstream resistance value z of current vortex impedance measurement device 4 detection in heating copper tube 3 downstream2
=r2+jx2, and this moment required driving frequency f of heating copper tube 3 is calculated according to this downstream resistance valuen, wherein n=1,2,
3 ..., enter step s4；
S4: calculate frequency increment δ f=fn-fn-1, and control setting driving frequency f of heating copper tube 3n-1=fn, and make
N=n+1, time delay 30s, enter step s5；
S5: judge whether wire drawing machine 2 quits work, if so, control and terminate；Otherwise return to step s3.
According to the method that resistance value seeks heating copper tube 3 driving frequency it is wherein:
Determine reinforcing bar radius r and reinforcing bar electricalresistivityρ, wherein resistivity is reinforcing bar eigenvalue,
According to formulaWith acquisition resistance value z=r+jx, try to achieve pcrmeabilityAnd conductance
RateWherein l is inductance value；
According to reinforcing bar internal driving value z=r+jx so that it may according to formulaCalculate and lead
Body is in the electrical conductivity of different frequency and pcrmeability, when frequency is relatively low, that is, during ω → 0, formula
Can approximate representation be:Impedance (the r of each measurement point correspondingi,xi), easily measurement pc reinforcing bar
Electrical conductivity ρ and magnetic permeability μ it may be assumed that
Further according to formulaTry to achieve driving frequency f, δ is electric current penetration radius, electric current permeates
Radius is more than or equal to reinforcing bar radius.
The operation principle of the present invention:
System power supply, opens wire drawing machine 2, the upstream current vortex impedance measurement device 4 primary detection pc steel of heating copper tube 3
The resistance value of muscle, calculates the initial firing frequency of heating copper tube 3 according to this resistance value, when reinforcing bar is from reinforcing bar conveyer belt 1,
When passing through heating copper tube 3, heating copper tube 3 heats to reinforcing bar, passes through the electricity in hot copper tube 3 downstream when reinforcing bar first time
During vortex impedance measurement device 4, the resistance value of reinforcing bar after current vortex impedance measurement device 4 detection heating, further according to this resistance value,
When assuming that electric current penetration radius are more than or equal to reinforcing bar radius, calculate the driving frequency needing to load now heating copper tube 3, if
Driving frequency frequency and original upload driving frequency that this needs loads, then controller revise heating copper tube 3 in real time
Load driving frequency；Hereafter at regular intervals, in the present embodiment, every 30s, the current vortex resistance in heating copper tube 3 downstream
Anti- measurement apparatus 4 detect to reinforcing bar resistance value at this, revise in real time and adjust；
During measurement resistance value, the impedance-driven device of current vortex impedance measurement device 4 41 is by power supply through crystal
After agitator 41a, digital frequency synthesizer 41b, dac transducer 41c, operational amplifier 41d are processed, form alternating current and drive
The excitation coil 42b of impedance probe 42 forms alternating magnetic field, thus producing current vortex letter on the reinforcing bar of reinforcing bar conveyer belt 1
Number, impedance measurement device 43 produces current vortex signal according on reinforcing bar, converts the electrical signal to digital signal, and realizes resistance value
Real part, imaginary part separate, real-time detection reinforcing bar resistance value.
Claims (8)
1. a kind of pc reinforcing bar electric induction driving frequency control device based on impedance measurement, including being arranged on reinforcing bar conveyer belt (1)
On wire drawing machine (2) it is characterised in that: heating copper tube (3) is additionally provided with described reinforcing bar conveyer belt (1), described plus
The upstream and downstream of hot copper tube (3) is respectively arranged with a consistent current vortex impedance measurement device (4) of structure；
The impedance output of two described current vortex impedance measurement devices (4) two impedance input with controller (5) respectively
Connect, two described current vortex impedance measurement devices (4) are respectively to before described controller (5) transmission reinforcing bar heating and after heating
Resistance value, described controller (5) also control described heating copper tube (3) induction power supply driving frequency.
2. the pc reinforcing bar electric induction driving frequency control device based on impedance measurement according to claim 1, its feature exists
In: encoder (6) is additionally provided with described reinforcing bar conveyer belt (1), described encoder (6) is also connected with described controller (5), uses
Transfer rate in measurement reinforcing bar；
Described controller (5) is also connected with described wire drawing machine (2), for controlling the drawing speed of described wire drawing machine (2)；
The downstream of described heating copper tube (3) is additionally provided with Infrared Surface temperature-detecting device (7), described Infrared Surface temperature inspection
Survey device (7) to be also connected with described controller (5), for transmitting rebar surface temperature data.
3. the pc reinforcing bar electric induction driving frequency control device based on impedance measurement according to claim 1, its feature exists
In: described current vortex impedance measurement device (4) includes impedance-driven device (41), impedance probe (42), impedance measurement device
(43) alternating current that, described impedance-driven device (41) generates drives described impedance probe (42) to produce alternating magnetic field, from
And current vortex signal is produced on the reinforcing bar on reinforcing bar conveyer belt (1), described impedance measurement device (43) produces according on reinforcing bar
Current vortex signal, real-time detection reinforcing bar resistance value, described impedance measurement device (43) is connected with described controller (5), for passing
Send reinforcing bar resistance value.
4. the pc reinforcing bar electric induction driving frequency control device based on impedance measurement according to claim 3, its feature exists
In: described impedance-driven device (41) is alternation driving means, the crystal that described impedance-driven device (41) inclusion is sequentially connected
Agitator (41a), digital frequency synthesizer (41b), dac transducer (41c), operational amplifier (41d), described crystal oscillator
(41a) input termination alternating current power supply, the alternating current outfan of described operational amplifier (41d) and described impedance probe
(42) connect.
5. the pc reinforcing bar electric induction driving frequency control device based on impedance measurement according to claim 3, its feature exists
In: described impedance probe (42) includes refractory ceramics skeleton (42a) and the excitation coil (42b) of helical structure, described steel
Muscle conveyer belt (1) passes through the refractory ceramics skeleton (42a) of helical structure, in the spiral of described refractory ceramics skeleton (42a)
Described excitation coil (42b), the ac power input end of described excitation coil (42b) and described impedance-driven are wound with skeleton
The alternating current outfan of device (41) connects.
6. the pc reinforcing bar electric induction driving frequency control device based on impedance measurement according to claim 3, its feature exists
In: signal amplifier (43a) that the inclusion of described impedance measurement device (43) is sequentially connected, programmable gain amplifier (43b), low
Bandpass filter (43c), adc transducer (43d), digital fourier transformation device (43e), in described digital fourier transformation device
(43e) real part outfan is all connected with described controller (5) through integrated chip interface (43f) with imaginary part outfan, described letter
The impedance signal input of number amplifier (43a) is connected with the impedance signal outfan of described impedance probe (42).
7. a kind of pc reinforcing bar electric induction driving frequency control method based on impedance measurement as claimed in claim 2, its feature
It is: comprise the following steps:
S1: initialization, makes n=1；
S2: described controller (5) controls described wire drawing machine (2) work, makes reinforcing bar start transmission upper in reinforcing bar conveyer belt (1), and
Obtain the upstream resistance value z that the current vortex impedance measurement device (4) of described heating copper tube (3) upstream detects1=r1+jx1, and
Calculate setting driving frequency f of described heating copper tube (3) according to this upstream resistance valuen-1, enter step s3；
The current vortex impedance measurement device (4) that s3: described controller (5) obtains described heating copper tube (3) downstream detects down
Trip resistance value z2=r2+jx2, and this moment required driving frequency of described heating copper tube (3) is calculated according to this downstream resistance value
fn, wherein n=1,2,3 ..., enter step s4；
S4: calculate frequency increment δ f=fn-fn-1, and control setting driving frequency f of described heating copper tube (3)n-1=fn, and
Make n=n+1, time delay ms, wherein, m >=0, enter step s5；
S5: judge whether wire drawing machine (2) quits work, if so, control and terminate；Otherwise return to step s3.
8. the pc reinforcing bar electric induction driving frequency control method based on impedance measurement according to claim 7, its feature exists
In: according to the method that resistance value seeks described heating copper tube (3) driving frequency be:
A1: determine reinforcing bar radius r and electricalresistivityρ；
A2: according to formulaWith acquisition resistance value z=r+jx, try to achieve pcrmeabilityAnd electrical conductivityWherein l is inductance value；
A3: according to formulaTry to achieve driving frequency f, δ is electric current penetration radius.
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| CN201610701868.3A CN106363030B (en) | 2016-08-22 | 2016-08-22 | PC reinforcing bars electric induction driving frequency control device and method based on impedance measurement |
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| CN201610701868.3A CN106363030B (en) | 2016-08-22 | 2016-08-22 | PC reinforcing bars electric induction driving frequency control device and method based on impedance measurement |
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Cited By (1)
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| CN109526081A (en) * | 2018-12-27 | 2019-03-26 | 邵阳高华工贸实业有限公司 | A kind of induction heating equipment and method for reinforcing bar production |
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| CN109526081A (en) * | 2018-12-27 | 2019-03-26 | 邵阳高华工贸实业有限公司 | A kind of induction heating equipment and method for reinforcing bar production |
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| CN106363030B (en) | 2018-08-03 |
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