CN106363030B - PC reinforcing bars electric induction driving frequency control device and method based on impedance measurement - Google Patents
PC reinforcing bars electric induction driving frequency control device and method based on impedance measurement Download PDFInfo
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- CN106363030B CN106363030B CN201610701868.3A CN201610701868A CN106363030B CN 106363030 B CN106363030 B CN 106363030B CN 201610701868 A CN201610701868 A CN 201610701868A CN 106363030 B CN106363030 B CN 106363030B
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- impedance
- reinforcing bar
- copper tube
- impedance measurement
- driving frequency
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Classifications
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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
-
- 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
-
- 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
Abstract
The present invention discloses a kind of PC reinforcing bars electric induction driving frequency control device and method based on impedance measurement, including the wire drawing machine on reinforcing bar conveyer belt is arranged, it is additionally provided with heating copper tube on the reinforcing bar conveyer belt, is respectively set that there are one the consistent current vortex impedance measurement devices of structure in the upstream and downstream of the heating copper tube；The impedance output of two current vortex impedance measurement devices is connect with two impedance inputs of controller respectively, for two current vortex impedance measurement devices respectively to the preceding impedance value with after heating of controller transmission reinforcing bar heating, the controller also controls the driving frequency of the heating copper tube induction power supply.Advantageous effect：It ensure that heating copper tube to the temperature of the heating of reinforcing bar and the uniformity of heating temperature, improves reinforcing bar rolling quality；The efficiency of heating surface is high, the entire reinforcing bar operation of rolling, simply, conveniently, reliable for operation.
Description
Technical field
The present invention relates to and structural steel defect detecting device, specifically a kind of PC reinforcing bars based on impedance measurement electricity
Excitation induced frequency control apparatus and method.
Background technology
Hot rolled ribbed bars are to press rib together through multiple tracks cold rolling tube reducing with gren rod and formed after eliminating internal stress
A kind of reinforcing bar carrying two faces or three face crescent is the most frequently used in civil construction project to increase the gripping force with concrete
One of steel.It is provided in the technical standard GB1499-91 of the existing production reinforcing bar in China, steel grade 20MnSi commonly uses outlet III
The intensity of grade reinforcing bar is 590MPa, and most domestic is II grade of reinforcing bar, and intensity only has 460MPa, foreign countries that Surge chamber height is widely used
Intensity steel, i.e. PC recessed screw threads reinforcing bar, intensity 1420MPa, it is used for 60m or less Bases in High Building Construction columns, abutment column, pipe
Stake, and railroad sleeper etc..It is directly used in prestressed concrete with steel wire, and is subject to indentation in PC steel wire surfaces.
In hot rolled ribbed bars production procedure, only an extremely important link, sensing heating are convenient for composition to sensing heating
Production line realizes mechanization production.PC reinforcing bar synchronous drivings.Power adjustment, temperature control, blowing with batch, can concentrate
It controls and operates in operation console.The most important technical parameter of induction heating technology is supply frequency.
Currently, the performance of China's electric elements is also not very stablized, inductance capacitance matching is not easy to keep transporting in the best condition
Row, the FREQUENCY CONTROL of sensing heating in hot rolled ribbed bars production procedure, also mainly according to power-adjusting power supply driving frequency,
Due to the Kelvin effect of sensing heating, hot rolled ribbed bars quickly continuous rear production, be easy to cause reinforcing bar in sensing heating in addition
Temperature field in the process is uneven, influences subsequent rolling process, and the mechanical property of hot rolled ribbed bars product is caused to reduce.
Invention content
In view of the above-mentioned problems, the present invention provides a kind of PC reinforcing bars electric induction driving frequency control dresses based on impedance measurement
It sets and method corrects swashing for heating copper tube in real time by acquiring heating copper tube upstream and downstream PC reinforcing bar impedance values in real time
Frequency is encouraged, ensures the temperature that heating copper tube heats reinforcing bar, ensures reinforcing bar internal and external temperature uniformity, improve reinforcing bar and roll matter
Amount.
In order to achieve the above objectives, the specific technical solution that the present invention uses is as follows：
A kind of PC reinforcing bars electric induction driving frequency control device based on impedance measurement, including be arranged on reinforcing bar conveyer belt
Wire drawing machine, key is：It is additionally provided with heating copper tube on the reinforcing bar conveyer belt, in the upper of the heating copper tube
Swim the current vortex impedance measurement device that structure is consistent there are one being respectively set with downstream；
The impedance output of two current vortex impedance measurement devices connects with two impedance inputs of controller respectively
It connects, the impedance value before two current vortex impedance measurement devices are heated to controller transmission reinforcing bar respectively and after heating,
The controller also controls the driving frequency of the heating copper tube induction power supply.
By above-mentioned design, under the drive of wire drawing machine, reinforcing bar is pulled to be driven on the reinforcing bar conveyer belt, the heating
The impedance of the current vortex impedance measurement device detection reinforcing bar of copper tube upstream, determines the initial excitation frequency of the heating copper tube
Rate, the reinforcing bar impedance after the current vortex impedance measurement device detection heating in the heating copper tube downstream, and calculate steel at this time
The required driving frequency of muscle, and the driving frequency of the setting to heating copper tube is corrected in real time, to ensure the heating temperature of reinforcing bar
The uniformity of degree and heating temperature improves reinforcing bar rolling quality, and whole process is not necessarily to artificially check the temperature of detection reinforcing bar, just
It can realize the real-time detection to reinforcing bar rolling quality, it is simple and convenient, it uses manpower and material resources sparingly.
It further describes, encoder is additionally provided on the reinforcing bar conveyer belt, the encoder also connects with the controller
It connects, the transmission speed for measuring reinforcing bar；The controller is also connect with the wire drawing machine, the drawing for controlling the wire drawing machine
Silk speed；The downstream of the heating copper tube is additionally provided with Infrared Surface temperature-detecting device, the Infrared Surface temperature detection
Device is also connect with the controller, for transmitting rebar surface temperature data.
Using the above scheme, the encoder monitors reinforcing bar transmission speed in real time, and transmission speed is sent to control
Device, controller can control the drawing speed of wire drawing machine again, and entire speed control realizes feedback control；Infrared Surface temperature simultaneously
Temperature signal can be sent to controller by detection device in real time in real time, realize the monitoring of temperature real-time tracking, it is ensured that heating copper tube
Heating actual temperature, lost caused by prevent that damaging from occurring in heating copper tube；It ensure that reinforcing bar in the reinforcing bar operation of rolling
Rolling temperature and speed, improve reinforcing bar rolling quality and rolling reliability.
It further describes, the current vortex impedance measurement device includes impedance-driven device, impedance probe, impedance survey
Device is measured, the alternating current that the impedance-driven device generates drives the impedance probe to generate alternating magnetic field, in steel
Current vortex signal is generated on reinforcing bar on muscle conveyer belt, the impedance measurement device is according to current vortex signal is generated on reinforcing bar, in fact
When detect reinforcing bar impedance value, the impedance measurement device is connect with the controller, for transmitting reinforcing bar impedance value.
Using the above scheme, impedance-driven device generate alternating driving voltages driving impedance detector generate exciting current from
And alternating magnetic field is generated, current vortex signal is generated in tested rebar surface, current vortex generates dynamic magnetic field, realizes impedance probe
Detection to reinforcing bar impedance value, impedance measurement device realizes that the transmission of impedance value, whole process are participated in without artificial, convenient fast
It is prompt.
It further describes, the impedance-driven device is alternation driving device, and the impedance-driven device includes successively
Crystal oscillator, digital frequency synthesizer, DAC converter, the operational amplifier of connection, the input termination of the crystal oscillator
The alternating current output end of AC power, the operational amplifier is connect with the impedance probe.
Using the above scheme, crystal oscillator, digital frequency synthesizer and DAC converter generate the sinusoidal letter of certain frequency
Number, the impedance of driving impedance detector detection reinforcing bar, easy to use after power amplifier, reliable for operation.
It further describes, the impedance probe includes the refractory ceramics skeleton and excitation coil of helical structure, institute
The refractory ceramics skeleton that reinforcing bar conveyer belt passes through helical structure is stated, is wound in the spiral skeleton of the refractory ceramics skeleton
There are the excitation coil, the alternating current output end of the ac power input end of the excitation coil and the impedance-driven device
Connection.
Using the above scheme, refractory ceramics skeleton with high temperature resistant, can simultaneously serve as the winding skeleton of excitation coil,
Excitation coil measures reinforcing bar impedance value under the driving of impedance-driven device, convenient and reliable.
It further describes, the impedance measurement device includes sequentially connected signal amplifier, programmable automation controller
Device, low-pass filter, ADC converters, digital fourier transformation device, the digital fourier transformation device real part output end with
Imaginary part output end is connect through integrated chip interface with the controller, the impedance signal input terminal of the signal amplifier and institute
State the impedance signal output end connection of impedance probe.
Using the above scheme, it when measuring reinforcing bar impedance value, calculates and operates without artificial, the survey to impedance may be implemented
Amount, and the calculating of impedance value real part imaginary part may be implemented, the monitoring to the reinforcing bar operation of rolling is realized, electric current is detected in real time and oozes
Saturating depth improves reinforcing bar rolling quality.
A kind of PC reinforcing bars electric induction driving frequency control method based on impedance measurement, includes the following steps：
S1：Initialization, enables n=1；
S2：The controller controls the wire drawing machine work, makes reinforcing bar start to transmit on reinforcing bar conveyer belt, and obtain institute
State the upstream impedance value Z of the current vortex impedance measurement device detection of heating copper tube upstream1=R1+jX1, and hindered according to the upstream
Anti- value calculates the setting driving frequency f of the heating copper tuben-1, enter step S3；
S3：The controller (5) obtains current vortex impedance measurement device (4) detection in described heating copper tube (3) downstream
Downstream impedance value Z2=R2+jX2, and this moment required excitation of the heating copper tube (3) is calculated frequently according to the downstream impedance value
Rate fn, wherein n=1,2,3 ..., enter step S4；
S4：Calculate frequency increment Δ f=fn-fn-1, and control the setting driving frequency f of the heating copper tube (3)n-1=
fn, and n=n+1 is enabled, delay m s, wherein m >=0 enters step S5；
S5：Judge whether wire drawing machine (2) is stopped, if so, control terminates；Otherwise return to step S3.
Using the above method, according to the reinforcing bar impedance value of heating copper tube upstream detection for the first time, to confirm heating red copper
The initial firing frequency of pipe corrects heating copper tube in real time then further according to the impedance value of heating copper tube detected downstream
Driving frequency keeps the reinforcing bar operation of rolling more reliable and more stable, improves the quality of reinforcing bar rolling.
It further describes, is according to the method that impedance value seeks the heating copper tube driving frequency：
A1：Determine reinforcing bar radius r and electricalresistivityρ；
A2：According to formulaWith acquisition impedance value Z=R+jX, magnetic conductivity is acquiredWith
ConductivityWherein L is inductance value；
A3：According to formulaDriving frequency f is acquired, Δ is electric current penetration radius.
Using the above method, it is only necessary to measure the radius of reinforcing bar, you can according to the impedance value of measurement, calculate reinforcing bar resistance
Rate, conductivity, magnetic conductivity are more than or equal to reinforcing bar radius further according to electric current penetration radius, calculate driving frequency.
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
Impedance value is detected, and to carry out control amendment to the driving frequency for heating copper tube, ensure that heating copper tube to reinforcing bar
Heating temperature and heating temperature uniformity, improve reinforcing bar rolling quality；Encoder, controller, wire drawing simultaneously
Reinforcing bar transmit process is formed closed loop, Real-time Feedback, adjustment reinforcing bar transmission speed by machine；Whole process only needs to measure steel
The radius of muscle, you can control and calculate the driving frequency of heating copper tube by controller, the efficiency of heating surface is high, improves and is heated
Reinforcing bar inside and outside Uniformity of Temperature Field, improves reinforcing bar rolling quality, makes the reinforcing bar operation of rolling, simply, conveniently, reliable for operation.
Description of the drawings
Fig. 1 is the controling device structure diagram 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.
1. reinforcing bar conveyer belt in figure, 2. wire drawing machinees, 3. heating copper tubes, 4. current vortex impedance measurement devices, 41. impedances are driven
Dynamic device, 41a. crystal oscillators, 41b. digital frequency synthesizers, 41c.DAC converters, 41d. operational amplifiers, 42. impedances
Detector, 42a. refractory ceramics skeletons, 42b. excitation coils, 43. impedance measurement devices, 43a. signal amplifiers, 43b. can
Program gain amplifier, 43c. low-pass filters, 43d.ADC converters, 43e. digital fourier transformation devices, 43f. integrated chips
Interface, 5. controllers, 6. encoders, 7. Infrared Surface temperature-detecting devices.
Specific implementation mode
Specific embodiment and working principle of the present invention will be described in further detail below in conjunction with the accompanying drawings.
A kind of PC reinforcing bars electric induction driving frequency control device based on impedance measurement is can be seen that from Fig. 1 and Fig. 2, is wrapped
The wire drawing machine 2 being arranged on reinforcing bar conveyer belt 1 is included, heating copper tube 3 is additionally provided on reinforcing bar conveyer belt 1, in heating red copper
The upstream and downstream of pipe 3 is respectively set that there are one the consistent current vortex impedance measurement devices 4 of structure；Two current vortex impedance measurements
The impedance output of device 4 is connect with two impedance inputs of controller 5 respectively, and two current vortex impedance measurement devices 4 divide
Impedance value before not transmitting reinforcing bar heating to controller 5 and after heating, controller 5 also control heating 3 induction power supply of copper tube
Driving frequency.
It can be seen that from Fig. 1 and Fig. 2 and be additionally provided with encoder 6 on reinforcing bar conveyer belt 1, encoder 6 also connects with controller 5
It connects, the transmission speed for measuring reinforcing bar；Controller 5 is also connect with wire drawing machine 2, the drawing speed for controlling wire drawing machine 2；Add
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
Connection, 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
Measuring device 43, the alternating current driving impedance detector 42 that impedance-driven device 41 generates generate alternating magnetic field, in steel
Current vortex signal is generated on reinforcing bar on muscle conveyer belt 1, impedance measurement device 43 is according to current vortex signal is generated on reinforcing bar, in real time
Reinforcing bar impedance value is detected, impedance measurement device 43 is connect with controller 5, for transmitting reinforcing bar impedance value.
From fig. 3 it can also be seen that impedance-driven device 41 is alternation driving device, impedance-driven device 41 includes connecting successively
Crystal oscillator 41a, digital frequency synthesizer 41b, DAC converter 41c, the operational amplifier 41d connect, crystal oscillator 41a
Input terminate AC power, the alternating current output end of operational amplifier 41d connect with impedance probe 42.
From fig. 3 it can also be seen that impedance probe 42 includes the refractory ceramics skeleton 42a and 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 ac power input end of excitation coil 42b is exported with the alternating current of impedance-driven device 41
End connection.
From fig. 3 it can also be seen that impedance measurement device 43 includes sequentially connected signal amplifier 43a, programmable-gain
Amplifier 43b, low-pass filter 43c, ADC converter 43d, digital fourier transformation device 43e, in digital fourier transformation device
The real part output end of 43e is connect through integrated chip interface 43f with controller 5 with imaginary part output end, the resistance of signal amplifier 43a
Antinoise signal input terminal is connect with the impedance signal output end of impedance probe 42.
From fig. 4, it can be seen that a kind of PC reinforcing bars electric induction driving frequency control based on impedance measurement as claimed in claim 2
Method includes the following steps：
S1：Initialization, enables n=1；
S2：Controller 5 controls wire drawing machine 2 and works, and reinforcing bar is made to start to transmit on reinforcing bar conveyer belt 1, and it is purple to obtain heating
The upstream impedance value Z that the current vortex impedance measurement device 4 of 3 upstream of copper pipe detects1=R1+jX1, and according to the upstream impedance value meter
Calculate the setting driving frequency f of heating copper tube 3n-1, enter step S3；
S3：Controller 5 obtains the downstream impedance value Z that the current vortex impedance measurement device 4 in 3 downstream of heating copper tube detects2
=R2+jX2, and this moment required driving frequency f for heating copper tube 3 is calculated according to the downstream impedance valuen, wherein n=1,2,
3 ..., enter step S4；
S4：Calculate frequency increment Δ f=fn-fn-1, and control the setting driving frequency f of heating copper tube 3n-1=fn, and enable
N=n+1, be delayed 30s, enters step S5；
S5：Judge whether wire drawing machine 2 is stopped, if so, control terminates；Otherwise return to step S3.
Wherein it is according to the method that impedance value seeks heating 3 driving frequency of copper tube：
Determining reinforcing bar radius r and reinforcing bar electricalresistivityρ, wherein resistivity is reinforcing bar eigenvalue,
According to formulaWith acquisition impedance value Z=R+jX, magnetic conductivity is acquiredAnd conductance
RateWherein L is inductance value；
According to reinforcing bar internal driving value Z=R+jX, so that it may according to formulaIt calculates
Conductor different frequency conductivity and magnetic conductivity, when frequency is relatively low, i.e. when ω → 0, formulaCan approximate representation be：The resistance of corresponding each measurement point
Anti- (Ri,Xi), it is easy to measure the conductivity ρ and magnetic permeability μ of PC reinforcing bars, i.e.,：
Further according to formulaDriving frequency f is acquired, Δ is electric current penetration radius, electric current infiltration
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, heats the 4 primary detection PC steel of upstream current vortex impedance measurement device of copper tube 3
The impedance value of muscle calculates the initial firing frequency of heating copper tube 3 according to the impedance value, when reinforcing bar is from reinforcing bar conveyer belt 1,
When across heating copper tube 3, heating copper tube 3 heats reinforcing bar, when reinforcing bar passes through the electricity in 3 downstream of hot copper tube for the first time
When being vortexed impedance measurement device 4, the impedance value of reinforcing bar after the detection heating of current vortex impedance measurement device 4, further according to the impedance value,
Assuming that when electric current penetration radius is more than or equal to reinforcing bar radius, the driving frequency that the needs of heating copper tube 3 at this time load is calculated, if
The driving frequency frequency of needs load is differed with original upload driving frequency, then controller corrects 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 3 downstream of heating copper tube
Anti- measuring device 4 is detected reinforcing bar impedance value at this, corrects and adjusts in real time；
During measuring impedance value, the impedance-driven device 41 of current vortex impedance measurement device 4 is by power supply through crystal
After oscillator 41a, digital frequency synthesizer 41b, DAC converter 41c, operational amplifier 41d processing, alternating current driving is formed
The excitation coil 42b of impedance probe 42 forms alternating magnetic field, to generate current vortex letter on the reinforcing bar of reinforcing bar conveyer belt 1
Number, impedance measurement device 43 converts the electrical signal to digital signal, and realize impedance value according to current vortex signal is generated on reinforcing bar
Real part, imaginary part separation, in real time detect reinforcing bar impedance value.
Claims (6)
1. a kind of PC reinforcing bars electric induction driving frequency control device based on impedance measurement, including be arranged in reinforcing bar conveyer belt (1)
On wire drawing machine (2), it is characterised in that：It is additionally provided with heating copper tube (3) on the reinforcing bar conveyer belt (1), adds described
The upstream and downstream of hot copper tube (3) is respectively set that there are one the consistent current vortex impedance measurement devices (4) of structure；
The impedance output of two current vortex impedance measurement devices (4) respectively with two impedance inputs of controller (5)
Connection, before two current vortex impedance measurement devices (4) are heated to the controller (5) transmission reinforcing bar respectively and after heating
Impedance value, the controller (5) also control the driving frequency of described heating copper tube (3) induction power supply；
The impedance of the current vortex impedance measurement device detection reinforcing bar of the heating copper tube upstream, determines the heating copper tube
Initial firing frequency, the reinforcing bar impedance after the current vortex impedance measurement device detection heating in the heating copper tube downstream, and count
The required driving frequency of reinforcing bar at this time is calculated, and the driving frequency of the setting to heating copper tube is corrected in real time；
Encoder (6) is additionally provided on the reinforcing bar conveyer belt (1), the encoder (6) also connect with the controller (5),
Transmission speed for measuring reinforcing bar；
The controller (5) also connect with the wire drawing machine (2), the drawing speed for controlling the wire drawing machine (2)；
The downstream of the heating copper tube (3) is additionally provided with Infrared Surface temperature-detecting device (7), the Infrared Surface temperature inspection
It surveys device (7) also to connect with the controller (5), for transmitting rebar surface temperature data；
The current vortex impedance measurement device (4) includes impedance-driven device (41), impedance probe (42), impedance measurement device
(43), the alternating current that the impedance-driven device (41) generates drives the impedance probe (42) to generate alternating magnetic field, from
And current vortex signal is generated on the reinforcing bar on reinforcing bar conveyer belt (1), the impedance measurement device (43) generates according on reinforcing bar
Current vortex signal detects reinforcing bar impedance value in real time, and the impedance measurement device (43) connect with the controller (5), for passing
Send reinforcing bar impedance value.
2. PC reinforcing bars electric induction driving frequency control device based on impedance measurement according to claim 1, feature exist
In：The impedance-driven device (41) is alternation driving device, and the impedance-driven device (41) includes sequentially connected crystal
Oscillator (41a), digital frequency synthesizer (41b), DAC converter (41c), operational amplifier (41d), the crystal oscillator
The input of (41a) terminates AC power, alternating current output end and the impedance probe of the operational amplifier (41d)
(42) it connects.
3. PC reinforcing bars electric induction driving frequency control device based on impedance measurement according to claim 1, feature exist
In：The impedance probe (42) includes the refractory ceramics skeleton (42a) and excitation coil (42b) of helical structure, the steel
Muscle conveyer belt (1) passes through the refractory ceramics skeleton (42a) of helical structure, in the spiral of the refractory ceramics skeleton (42a)
The excitation coil (42b), ac power input end and the impedance-driven of the excitation coil (42b) are wound on skeleton
The alternating current output end of device (41) connects.
4. PC reinforcing bars electric induction driving frequency control device based on impedance measurement according to claim 1, feature exist
In：The impedance measurement device (43) includes sequentially connected signal amplifier (43a), programmable gain amplifier (43b), low
Bandpass filter (43c), ADC converters (43d), digital fourier transformation device (43e), in the digital fourier transformation device
The real part output end of (43e) is connect through integrated chip interface (43f) with the controller (5) with imaginary part output end, the letter
The impedance signal input terminal of number amplifier (43a) is connect with the impedance signal output end of the impedance probe (42).
5. a kind of controlling party of PC reinforcing bars electric induction driving frequency control device based on impedance measurement as described in claim 1
Method, it is characterised in that：Include the following steps：
S1：Initialization, enables n=1；
S2：The controller (5) controls wire drawing machine (2) work, and reinforcing bar is made to start to transmit on reinforcing bar conveyer belt (1), and
Obtain the upstream impedance value Z of current vortex impedance measurement device (4) detection of described heating copper tube (3) upstream1=R1+jX1, and
The setting driving frequency f of the heating copper tube (3) is calculated according to the upstream impedance valuen-1, enter step S3；
S3：The controller (5) obtains under current vortex impedance measurement device (4) detection in described heating copper tube (3) downstream
Swim impedance value Z2=R2+jX2, and this moment required driving frequency for heating copper tube (3) is calculated according to the downstream impedance value
fn, wherein n=1,2,3 ..., enter step S4；
S4：Calculate frequency increment Δ f=fn-fn-1, and control the setting driving frequency f of the heating copper tube (3)n-1=fn, and
Enable n=n+1, delay m s, wherein m >=0 enters step S5；
S5：Judge whether wire drawing machine (2) is stopped, if so, control terminates；Otherwise return to step S3.
6. the controlling party of PC reinforcing bars electric induction driving frequency control device based on impedance measurement according to claim 5
Method, it is characterised in that：It is according to the method that impedance value seeks described heating copper tube (3) driving frequency：
A1：Determine reinforcing bar radius r and electricalresistivityρ；
A2：According to formulaWith acquisition impedance value Z=R+jX, magnetic conductivity is acquiredAnd conductivityWherein L is inductance value；
A3：According to formulaDriving frequency f is acquired, 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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| 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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| 钢棒生产线感应加热过程的数值及实验研究;赵前哲;《中国博士学位论文全文数据库 工程科技Ⅰ辑》;20131130;第12-17页 * |
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