CN110239104A - The method that DC inversion electro-fusion welding machine output voltage compensates automatically - Google Patents
The method that DC inversion electro-fusion welding machine output voltage compensates automatically Download PDFInfo
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- CN110239104A CN110239104A CN201910367461.5A CN201910367461A CN110239104A CN 110239104 A CN110239104 A CN 110239104A CN 201910367461 A CN201910367461 A CN 201910367461A CN 110239104 A CN110239104 A CN 110239104A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
- B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/87—Auxiliary operations or devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
- B29C66/962—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process using proportional controllers, e.g. PID controllers [proportional–integral–derivative controllers]
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- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The present invention relates to plastic conduit electric fusion welding technologies, it is desirable to provide a kind of method that DC inversion electro-fusion welding machine output voltage compensates automatically.This method comprises: expiring waveform effective voltage U according to the resistance value R of electric melting pipe fittings and inductance value L, exchange electro-fusion welding machine0With the weldingvoltage U of electric melting pipe fittingsA, calculate power factor λ when adjusting using exchange electro-fusion welding machine；Alternatively, calculating power factor λ using fitting formula；Then the output voltage of DC inverter welding machine is compensated, keeps actual DC welding process equal with AC welding power when determining welding condition on electric melting pipe fittings.By means of the invention it is also possible to effectively eliminate the power factor influence for obtaining heat practical to electric melting pipe fittings, so that welding process is met optimised process requirement, be effectively prevented the generation of weldering defect.The control method is added in existing digital welding machine in which can be convenient, and becomes with automatic compensation output voltage and prevented the novel electric melting welding machine of weldering function.
Description
Technical field
The present invention relates to the reinforced plastics such as plastic conduit electric fusion welding technology, including high density polyethylene pipe, steel wire/steel band
The electric fusion welding technology of the plastic composite pipes of enhancings such as multiple tube, glass/carbon fiber and aramid fiber.
Background technique
Compared with metallic conduit, plastic conduit and compound pipeline complex pipeline are with corrosion-resistant, flexibility is good, light-weight, service life
Long, performance such as can design at the advantages, be widely used in building water supply and drainage, pulp conveying, fuel gas transmission, oil-gas transportation, oil field gathering and transportation
And the fields such as nuclear power station cooling water conveying.Electric smelting connection is plastic tube and the most common connection type of multiple tube.
Electric fusion welding is the physics fusion process an of material: being first inserted into plastic tube to be connected or compound tube end
It is embedded in the electric melting sleeve of resistance wire, and is in close contact pipe outer surface and sleeve interior surface.Electric melting sleeve is connected to
The power supply of fixed voltage makes to bury resistance wire heating power in electric melting pipe fittings.The heat gradually polyethylene into tubing and sleeve
Material transmitting, melts outer pipe wall face and pipe fitting inner wall face gradually and is integrated.After electric fusion welding, connector Slow cooling,
Original weld interface disappears, and forms the electric fusion joint with some strength.
Electro-fusion welding machine can be divided into inverse type direct current and phase control-type AC welding set two by control mode on domestic market
Kind.Phase control-type exchanges electro-fusion welding machine (hereinafter referred to as AC welding set) and mainly uses silicon-controlled phase shifting control principle, utilizes brilliant lock
Pipe pressure regulation.The imports electro-fusion welding machine such as Italian RITMO and France modeling dragon and many domestic electro-fusion welding machines all use this scheme.Its
Advantage is: circuit is simple, easy to accomplish.The disadvantage is that: (1) volume big, quality weight: since mains frequency is 50HZ, so necessary
The bulky annular Industrial Frequency Transformer of a volume is carried on the back, increases electro-fusion welding machine overall weight, phase control-type alternating current domestic at present
For fusing soldering welder weight generally in 20KG or more, import is also not less than 17KG, causes field construction to be carried inconvenient.(2) inefficient: to become
Depressor loss is big, reduces the working efficiency of complete machine.(3) there is the interference of higher hamonic wave to power grid.
For contravariant electro-fusion welding machine (hereinafter referred to as DC welder), using can switch-off power device (IGBT, IPM, GTR)
HF switch control.Power-frequency voltage is carried out full-wave rectification by it, then carries out high-frequency inversion, after high frequency transformer carries out transformation
It rectifies again, filters, finally obtain required voltage.The biggest advantage is to use high frequency transformer instead of biography for the program
The Industrial Frequency Transformer of system, for the core material of Industrial Frequency Transformer using silicon steel sheet, high frequency transformer core material is ferrite.
Ferrite is composite oxide sintered body, main component Zn, Mn etc., and magnetic conductivity is high, in certain coil turn, by little
Exciting current can have higher magnetic induction intensity, coil can bear higher applied voltage, therefore export certain power
Requirement under, core volume can be reduced, so that the weight and volume of entire welding machine be made all to greatly reduce, field is advantageous to and applies
Work and carrying.The coercivity of magnetic core is low, and hysteresis ring area is small, thus iron loss is also small.And when iron core has higher resistance
When rate, then the vortex generated is small, and iron loss is also small.So work efficiency is high for high frequency transformer, generally 90% or more, and by temperature
Influence small, price is low, and output voltage error can be controlled in ± 0.2v.Combination with the MCU controllability is good, can be according to the need of user
Seek flexibly control extension function.
In the past 10 years, domestic includes that Zhejiang University, Southeast China University, University Of Tianjin, Guangdong University of Technology etc. propose base successively
In different types of single-chip microcontroller, the inverse type direct current electro-fusion welding machine of embedded system, many producers also produce light-weight inverse
Modification direct current electro-fusion welding machine product.However live use process discovery, the electric melting pipe fittings using the welding of inverse type DC welder hold
The problems such as overflow easily occurs, causes electric fusion joint to cross weldering.Thus, the industry acceptance of plasma cutting inverter is poor, wants to safety
The fields such as higher gas pipeline are asked, phase control-type AC welding set is still generally used.
Applicant has found that this phenomenon mainly determines method and electricity by the technique of electric melting pipe fittings industry by further investigation
What the voltage output characteristics joint effect of fusion welding generated.
Electric melting pipe fittings industry uses different wiring techniques to the electric melting pipe fittings of different size, then uses 39.5V standard
The phase control-type AC welding set of voltage is welded, the weld interface intensity of the electric fusion joint by testing different weld intervals, really
Surely it is suitable for the best electric fusion welding time of the specification.For example, DN90 straight-through electric melting pipe fittings, resistance are 1.05 ohm, exploitation
The method for determining its best weld interval in the process is to be welded using the phase control-type AC welding set of 39.5V, be respectively welded 80
Then second, 90 seconds, 100 seconds, 110 seconds, 120 seconds etc. carry out destructive testing to the connector being welded, the best connector of intensity
Weld interval is defined as standard weld interval.In engineer application, unless stated otherwise, friendship is proposed under default situations
Fluid welding machine is welded, however is not also repelled and welded using DC welder.
On the other hand, the output of phase control-type AC welding set is the alternating current after copped wave, and the output of inverse type DC welder is flat
Straight direct current.Since resistance wire is helical wound on pipe fitting inner wall in electric melting pipe fittings, thus resistance wire is in addition to existing
Other than resistance, there is also certain inductance.Especially alternating current is by carrying out high-frequency harmonic after copped wave, so that the induction reactance of resistance
It greatly increases.Therefore, electric melting pipe fittings are actually to act on electric melting pipe fittings using AC welding set when determining progress weld interval
Resistance R and inductance L on, although output voltage virtual value be UIt hands over=39.5V, but since there are phase differences for electric current and voltage, make
Obtain practical active-power PHaveLess than apparent energy PDepending on, the case where being even equivalent to direct voltage output, equivalent voltage UDirectlyIt is less than
UIt hands over(39.5V)。
It may thereby determine that, weld interval determining electric melting pipe fittings, Equivalent DC are carried out using phase control-type AC welding set
Weldingvoltage should be lower than 39.5V.Therefore, it is welded according to inverse type DC welder, the direct current weldingvoltage of output is
39.5V then actually has been over the weldingvoltage when adjusting of electric melting pipe fittings weld interval, therefore welding is easy to happen to the end
Cross weldering even material spray.
Therefore, the problem to be solved in the present invention is, how to be welded using DC inverter welding machine to electric melting pipe fittings, even if
The welding parameter of electric melting pipe fittings is adjusted with AC welding set, can also be simulated the effect of electric melting pipe fittings AC welding, is unlikely to
Weldering occurred.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a kind of DC inversion electro-fusion welding machine
The method that output voltage compensates automatically.It, can be automatic if the welding condition of electric melting pipe fittings is determined based on AC welding
A certain amount of output voltage is compensated, so that the power for welding direct current is equal with the active power of AC welding, to guarantee straight
The consistency of fluid welding termination process and AC welding process.
To solve the above problems, the technical solution adopted by the present invention is that, a kind of DC inversion electro-fusion welding machine output electricity is provided
Press the method compensated automatically, comprising the following steps:
(1) the power factor λ of the exchange electro-fusion welding machine for adjusting welding condition is obtained
Expire waveform effective voltage U according to the resistance value R of electric melting pipe fittings and inductance value L, exchange electro-fusion welding machine0And electric melting pipe fittings
Weldingvoltage UA, calculate power factor λ when adjusting using exchange electro-fusion welding machine；Wherein it is effective to expire waveform for exchange electro-fusion welding machine
Voltage U0Refer to full waveform of exchange (AC) the 220V voltage of exchange electro-fusion welding machine input after transformer pressure-reducing before non-copped wave
The virtual value of voltage；
(1.1) output voltage virtual value is calculated
According to the instantaneous value of exchange electro-fusion welding machine output chopping voltage:
And effective voltage calculation formula, output voltage virtual value is calculated:
Each symbol in above-mentioned formula:
U (t) is output voltage instantaneous value, V；U0For full waveform effective voltage after welding machine decompression, V；K is random natural number,
Dimensionless；θ is the copped wave angle for exporting chopping voltage, rad；ω=2 π f, rad/s, wherein f is that (alternating current is ac frequency
50Hz)；UmFor output voltage virtual value, V；T is time, s；π is pi, dimensionless；
(1.2) complex-exponential function form is converted voltages into
The complex-exponential function form conversion of Fourier transformation is carried out to output voltage:
Wherein,It is the corresponding Fourier Transform Coefficients of k ω, j
For imaginary unit；tan-1For the inverse function of tan, i.e. arctan, value range (- π, π)；
a0=0
In formula: a-1, b-1, a0, b0, ak, bkIt is Fourier Transform Coefficients, k is natural number；
(1.3) complex impedance is converted into complex-exponential function form
Wherein,It is the corresponding Fourier Transform Coefficients of k ω；
Each symbol in above-mentioned formula:
Z is the complex impedance of electric melting pipe fittings；R is electric melting pipe fittings resistance value, Ω；L is electric melting pipe fittings inductance value, H；
(1.4) calculating current virtual value
The complex-exponential function form of electric current are as follows:
According to the calculation formula of current effective value, current effective value is calculated are as follows:
Each symbol in above-mentioned formula:
I (t) is the instantaneous value for exporting electric current, A；imFor the virtual value for exporting electric current, A；i(t)ReIndicate electric current plural form
Real part；T is ac period, s (alternating current 0.02s)；
(1.5) apparent energy and active power are calculated
Apparent energy are as follows:
Active power are as follows:
Each symbol in above-mentioned formula: SP is apparent energy, W；RP is active power, W；U(t)ReIndicate voltage plural number shape
The real part of formula；
(1.6) power factor is calculated
Power factor is the ratio between welding machine active power and apparent energy:
In above-mentioned formula: λ is power factor；
(2) output voltage of DC inverter welding machine is compensated
In order to make actual DC welding process and AC welding power phase when determining welding condition on electric melting pipe fittings
Deng, to welding when DC inversion electro-fusion welding machine output voltage compensate:
Wherein, the equal equation of electric melting pipe fittings bonding power is as follows during guaranteeing two:
Voltage compensation is determined by following formula:
In formula, P is the bonding power of electric melting pipe fittings in welding process；UDPass through voltage compensation for DC inversion electro-fusion welding machine
Actual output voltage afterwards, V；UAFor AC welding voltage, V as defined in electric melting pipe fittings welding procedure；λ is to be calculated by step (1)
The power factor of acquisition.
The present invention also provides a kind of methods that DC inversion electro-fusion welding machine output voltage compensates automatically, including following step
It is rapid:
(1) the power factor λ of the exchange electro-fusion welding machine for adjusting welding condition is calculated using fitting formula:
λ=[A1·ke 2+A2·ke+A3]·[B1·ke 3+B2·ke 2+B3·ke+B4]
A in formula1、A2、A3、B1、B2、B3、B4It is coefficient；ueFor the pressure regulation coefficient in welding process；keFor inductive resistance
Than；The expression formula of each coefficient is as follows:
In formula, R is electric melting pipe fittings resistance value, Ω；L is electric melting pipe fittings inductance value, H；U0Expire waveform for exchange electro-fusion welding machine
Effective voltage；UAFor the weldingvoltage of electric melting pipe fittings；
(2) output voltage of DC inverter welding machine is compensated
In order to make actual DC welding process and AC welding power phase when determining welding condition on electric melting pipe fittings
Deng, to welding when DC inversion electro-fusion welding machine output voltage compensate:
Wherein, the equal equation of electric melting pipe fittings bonding power is as follows during guaranteeing two:
Voltage compensation is determined by following formula:
In formula, P is the bonding power of electric melting pipe fittings in welding process；UDPass through voltage compensation for DC inversion electro-fusion welding machine
Actual output voltage afterwards, V；UAFor AC welding voltage, V as defined in electric melting pipe fittings welding procedure；λ is to be calculated by step (1)
The power factor of acquisition.
In the present invention, before the operation for executing step (1), first according to the welding condition types of electric melting pipe fittings, to being
It is no to need to carry out output voltage compensation and confirmed；It is carried out if electric melting pipe fittings are specified using DC voltage (usually DC 39.5V)
Welding, then without carrying out additional output voltage compensation；If electric melting pipe fittings are carried out using alternating voltage (usually AC 39.5V)
Welding, then need to compensate output voltage.
Invention further provides the DC inversion electro-fusion welding machines with output voltage automatic compensation function, including are used for
Load the processor of control function module；It is loaded in the processor and compensates mould automatically for realizing the output voltage of preceding method
Block；The electro-fusion welding machine further includes the resistance measuring circuit that processor is connected to by conducting wire, for measuring the resistance of electric melting pipe fittings
Value；Selection key for compensating to output voltage is equipped on the operation panel of electro-fusion welding machine, for right before welding
The selection key that electric melting pipe fittings resistance R is measured, and expire waveform effective voltage U for input AC electro-fusion welding machine0And electricity
The input interface of fusion tube part inductance value L.
Compared with prior art, beneficial effects of the present invention:
1, by means of the present invention, for using exchange electro-fusion welding machine to adjust the electric melting pipe fittings of welding condition, and
When actual welding uses DC inversion electro-fusion welding machine, compensated by the output voltage of DC inversion electro-fusion welding machine, Ke Yiyou
The power factor influence for obtaining heat practical to electric melting pipe fittings is eliminated on effect ground, so that welding process is met optimised process requirement, effectively
Ground prevented the generation of weldering defect.
2, control method of the present invention is added in existing digital welding machine in which can be convenient, and becoming has
Automatic compensation output voltage and the novel electric melting welding machine for preventing weldering function.
Detailed description of the invention
Fig. 1 is that the present invention has the function of the welding process figure of voltage automatic compensating DC welder.
Specific embodiment
It is that computer technology is being welded the present invention relates to the automatic welder technology of electric melting pipe fittings firstly the need of explanation
A kind of application of technical field.During realization of the invention, the application of multiple software function modules can be related to.Applicant
Think, such as after reading over application documents, accurate understanding realization principle and goal of the invention of the invention, is combining existing public affairs
In the case where knowing technology, the software programming technical ability that those skilled in the art can grasp completely with it realizes the present invention.It is aforementioned
Software function module includes but is not limited to: the automatic compensating module of output voltage, control function module etc., all the present patent application files
Category this scope referred to, applicant will not enumerate.
In the present invention, before welding electric melting pipe fittings using DC inversion electro-fusion welding machine, first have to judge whether to need
Carry out output voltage compensation.It is welded, is not necessarily to using DC voltage (usually DC 39.5V) if electric melting pipe fittings are specified
Carry out additional output voltage compensation；If electric melting pipe fittings are welded using alternating voltage (usually AC 39.5V), need pair
Output voltage compensates.
For the electric melting pipe fittings of AC welding technique, the electric melting pipe fittings are being carried out using DC inverter welding machine to weld preceding survey
Measure its resistance value R, inductance value L.According to the resistance value R of electric melting pipe fittings, inductance value L, exchanging electro-fusion welding machine expires waveform effective voltage
U0, electric melting pipe fittings weldingvoltage UAThis four parameters, which can be calculated, is tested to obtain welding procedure ginseng by exchange electro-fusion welding machine
Power factor λ during number.
Power factor is calculated according to the following formula:
λ=[A1·ke 2+A2·ke+A3]·[B1·ke 3+B2·ke 2+B3·ke+B4]
A in formula1、A2、A3、B1、B2、B3、B4It is coefficient；ueFor the pressure regulation coefficient in welding process；keFor inductive resistance
Than；The expression formula of each coefficient is as follows:
Electric smelting when in order to make the bonding power in actual DC welding process on electric melting pipe fittings and determine welding condition
AC welding power on pipe fitting is equal, and the output voltage of DC inversion electro-fusion welding machine compensates when to welding.Guarantee two
The equal equation of electric melting pipe fittings bonding power is as follows in the process:
In formula, P is the bonding power of electric melting pipe fittings in welding process；UDPass through voltage compensation for DC inversion electro-fusion welding machine
Actual output voltage afterwards, V；UAFor the weldingvoltage that electric melting pipe fittings are tested by exchange electro-fusion welding machine, V；λ is electric melting pipe fittings
The power factor during welding condition is adjusted by exchange electro-fusion welding machine.
Voltage compensation is then determined by following formula:
Since power factor λ is consistently less than 1, it can be seen that if AC welding voltage U used in adjusting welding procedureA=
39.5V, then direct current weldingvoltage UDCertainly less than 39.5V.So the output voltage of DC inversion electro-fusion welding machine should be according toIt compensates, the heat for preventing electric melting pipe fittings from obtaining is excessive to cause weldering defect.
Realize the specific implementation step of the automatic compensation function of DC inverter welding machine output voltage are as follows:
(1) judge whether to need to carry out output voltage compensation
It is welded if electric melting pipe fittings are specified using DC voltage (such as DC 39.5V), without carrying out additional output electricity
Pressure compensation；
If electric melting pipe fittings are welded using alternating voltage (such as AC 39.5V), need to compensate output voltage,
Newly-increased voltage compensation key is pressed on the operation panel of welding machine, and the control system of welding machine is converted to voltage compensation program, then
It carries out the following steps and realizes welding；
(2) parameter input is carried out before welding
Before electro-fusion welding machine is connect with electric melting pipe fittings, the inductance value L of electric melting pipe fittings to be welded is obtained using multimeter measurement.
Then electro-fusion welding machine and electric melting pipe fittings are attached, before welding starts, carry out parameter input operation:
Inputted on the operation panel of welding machine determine electric melting pipe fittings technological parameter when exchange electro-fusion welding machine used expire waveform and have
Imitate voltage U0, electric melting pipe fittings weldingvoltage UAAnd the inductance value L of electric melting pipe fittings.
(3) resistance measurement before welding
After electro-fusion welding machine and electric melting pipe fittings complete connection, the resistance measurement key added on pushing operation panel, welding machine
The voltage of 3~5V will be exported, and measure the voltage on sealing wire, current value, available electric melting pipe fittings is initial according to the following formula
Resistance value
In formula, RfFor the initial resistivity value of electric melting pipe fittings, Ω；U0To measure obtained sealing wire both end voltage value, V；I0For
Current value on sealing wire, A；
(4) the control stage in welding process
Welding machine is inputted according to above-mentioned parameter and resistance value R, the inductance of resistance measurement stage available electric melting pipe fittings
Value L, exchange electro-fusion welding machine expire waveform effective voltage U0, electric melting pipe fittings weldingvoltage UAIf can be calculated Deng four parameters
Power factor λ when being welded using exchange electro-fusion welding machine, according still further toTo the output electricity of DC inverter welding machine
Pressure compensates, and realizes the automatic compensation function of DC inverter welding machine output voltage.
In order to realize the above functions, it needs to improve existing electro-fusion welding machine measuring circuit, operation panel:
(1) increase the selection key compensated to output voltage on operation panel；
(2) the preceding measuring circuit to electric melting pipe fittings resistance R of welding is added in measuring circuit；
(3) increase resistance measurement key on operation panel；
(4) electro-fusion welding machine of increasing exchanges on operation panel expires waveform effective voltage U0, electric melting pipe fittings inductance value L input
Interface.
Specific embodiment 1:
The DN200 middle wealth electric melting pipe fittings led directly to are welded with DC inversion electro-fusion welding machine in this example, the electric smelting pipe
The welding condition of part is by waveform effective voltage U full after transformation0The exchange electro-fusion welding machine of=92V determines that weldingvoltage is
39.5V.Entire welding process is as follows:
(1) judge whether to need to carry out output voltage compensation
It checks the welding condition type of certain straight-through brand electric melting pipe fittings of DN200, is welded for alternating voltage.In welding machine
Operation panel on press newly-increased voltage compensation key, the control system of welding machine is converted to voltage compensation program；
(2) parameter input is carried out before welding
Before electro-fusion welding machine is connect with electric melting pipe fittings, the inductance value L of electric melting pipe fittings to be welded is obtained using multimeter measurement
=310.6uH.Then electro-fusion welding machine and electric melting pipe fittings are attached, before welding starts, carry out parameter input operation:
Inputted on the operation panel of welding machine determine electric melting pipe fittings technological parameter when exchange electro-fusion welding machine used expire waveform and have
Imitate voltage U0The weldingvoltage U of=92V, electric melting pipe fittingsAThe inductance value L=310.6uH of=39.5V and electric melting pipe fittings.
(3) resistance measurement before welding
After electro-fusion welding machine and electric melting pipe fittings complete connection, the resistance measurement key added on pushing operation panel, welding machine
The voltage of 3~5V will be exported, and measure the voltage on sealing wire, current value, available electric melting pipe fittings is initial according to the following formula
Resistance value
In formula, RfFor the initial resistivity value of electric melting pipe fittings, Ω；U0To measure obtained sealing wire both end voltage value, V；I0For
Current value on sealing wire, A；
(4) the control stage in welding process
Welding machine is inputted according to above-mentioned parameter and the resistance value R=1.15 of resistance measurement stage available electric melting pipe fittings
Ω, inductance value L=310.6uH, exchange electro-fusion welding machine expire waveform effective voltage U0The weldingvoltage U of=92V, electric melting pipe fittingsA=
Four parameters such as 39.5V bring power factor fitting formula into, are welded if can be calculated using exchange electro-fusion welding machine
Power factor λ=0.9487 when connecing, according still further toThe output voltage of DC inverter welding machine is carried out
The automatic compensation function of DC inverter welding machine output voltage, the welding electricity of actual DC inverter electro-fusion welding output are realized in compensation
Press UD=38.5V.
Specific embodiment 2:
The DN450 middle wealth electric melting pipe fittings led directly to are welded with DC inversion electro-fusion welding machine in this example, the electric smelting pipe
The welding condition of part is by waveform effective voltage U full after transformation0The exchange electro-fusion welding machine of=92V determines that weldingvoltage is
60V.Entire welding process is as follows:
(1) judge whether to need to carry out output voltage compensation
It checks the welding condition type of certain straight-through brand electric melting pipe fittings of DN450, is welded for alternating voltage.In welding machine
Operation panel on press newly-increased voltage compensation key, the control system of welding machine is converted to voltage compensation program；
(2) parameter input is carried out before welding
Before electro-fusion welding machine is connect with electric melting pipe fittings, the inductance value L of electric melting pipe fittings to be welded is obtained using multimeter measurement
=500.8uH.Then electro-fusion welding machine and electric melting pipe fittings are attached, before welding starts, carry out parameter input operation:
Inputted on the operation panel of welding machine determine electric melting pipe fittings technological parameter when exchange electro-fusion welding machine used expire waveform and have
Imitate voltage U0The weldingvoltage U of=92V, electric melting pipe fittingsAThe inductance value L=500.8uH of=60V and electric melting pipe fittings.
(3) resistance measurement before welding
After electro-fusion welding machine and electric melting pipe fittings complete connection, the resistance measurement key added on pushing operation panel, welding machine
The voltage of 3~5V will be exported, and measure the voltage on sealing wire, current value, available electric melting pipe fittings is initial according to the following formula
Resistance value
In formula, RfFor the initial resistivity value of electric melting pipe fittings, Ω；U0To measure obtained sealing wire both end voltage value, V；I0For
Current value on sealing wire, A；
(4) the control stage in welding process
Welding machine is inputted according to above-mentioned parameter and the resistance value R=1.05 of resistance measurement stage available electric melting pipe fittings
Ω, inductance value L=500.8uH, exchange electro-fusion welding machine expire waveform effective voltage U0The weldingvoltage U of=92V, electric melting pipe fittingsA=
Four parameters such as 60V bring power factor fitting formula into, are welded if can be calculated using exchange electro-fusion welding machine
When power factor enter=0.9323, according still further toThe output voltage of DC inverter welding machine is carried out
The automatic compensation function of DC inverter welding machine output voltage, the welding electricity of actual DC inverter electro-fusion welding output are realized in compensation
Press UD=57.9V.
Claims (5)
1. a kind of method that DC inversion electro-fusion welding machine output voltage compensates automatically, which comprises the following steps:
(1) the power factor λ of the exchange electro-fusion welding machine for adjusting welding condition is obtained
Expire waveform effective voltage U according to the resistance value R of electric melting pipe fittings and inductance value L, exchange electro-fusion welding machine0With the weldering of electric melting pipe fittings
Meet voltage UA, calculate power factor λ when adjusting using exchange electro-fusion welding machine；Wherein exchange electro-fusion welding machine expires waveform effective voltage
U0Refer to having for full waveform voltage of the alternating current 220V voltage of exchange electro-fusion welding machine input after transformer pressure-reducing before non-copped wave
Valid value；
(1.1) output voltage virtual value is calculated
According to the instantaneous value of exchange electro-fusion welding machine output chopping voltage:
And effective voltage calculation formula, output voltage virtual value is calculated:
Each symbol in above-mentioned formula:
U (t) is output voltage instantaneous value, V；U0For full waveform effective voltage after welding machine decompression, V；K is random natural number, immeasurable
Guiding principle；θ is the copped wave angle for exporting chopping voltage, rad；ω=2 π f, rad/s, wherein f is ac frequency；UmHave for output voltage
Valid value, V；T is time, s；π is pi, dimensionless；
(1.2) complex-exponential function form is converted voltages into
The complex-exponential function form conversion of Fourier transformation is carried out to output voltage:
Wherein,It is the corresponding Fourier Transform Coefficients of k ω, j is void
Number unit；tan-1For the inverse function of tan, i.e. arctan, value range (- π, π)；
a0=0
In formula: a-1, b-1, a0, b0, ak, bkIt is Fourier Transform Coefficients, k is natural number；
(1.3) complex impedance is converted into complex-exponential function form
Wherein,It is the corresponding Fourier Transform Coefficients of k ω；
Each symbol in above-mentioned formula:
Z is the complex impedance of electric melting pipe fittings；R is electric melting pipe fittings resistance value, Ω；L is electric melting pipe fittings inductance value, H；
(1.4) calculating current virtual value
The complex-exponential function form of electric current are as follows:
According to the calculation formula of current effective value, current effective value is calculated are as follows:
Each symbol in above-mentioned formula:
I (t) is the instantaneous value for exporting electric current, A；imFor the virtual value for exporting electric current, A；i(t)ReIndicate the reality of electric current plural form
Number part；T is ac period, s；
(1.5) apparent energy and active power are calculated
Apparent energy are as follows:
Active power are as follows:
Each symbol in above-mentioned formula: SP is apparent energy, W；RP is active power, W；U(t)ReIndicate voltage plural form
Real part；
(1.6) power factor is calculated
Power factor is the ratio between welding machine active power and apparent energy:
In above-mentioned formula: λ is power factor；
(2) output voltage of DC inverter welding machine is compensated
It is right in order to keep actual DC welding process equal with AC welding power when determining welding condition on electric melting pipe fittings
The output voltage of DC inversion electro-fusion welding machine compensates when welding:
Wherein, the equal equation of electric melting pipe fittings bonding power is as follows during guaranteeing two:
Voltage compensation is determined by following formula:
In formula, P is the bonding power of electric melting pipe fittings in welding process；UDIt is DC inversion electro-fusion welding machine after voltage compensation
Actual output voltage, V；UAFor AC welding voltage, V as defined in electric melting pipe fittings welding procedure；λ is to be calculated to obtain by step (1)
Power factor.
2. a kind of method that DC inversion electro-fusion welding machine output voltage compensates automatically, which comprises the following steps:
(1) the power factor λ of the exchange electro-fusion welding machine for adjusting welding condition is calculated using fitting formula:
λ=[A1·ke 2+A2·ke+A3]·[B1·ke 3+B2·ke 2+B3·ke+B4]
A in formula1、A2、A3、B1、B2、B3、B4It is coefficient；ueFor the pressure regulation coefficient in welding process；keFor inductive resistance ratio；Respectively
The expression formula of coefficient is as follows:
In formula, R is electric melting pipe fittings resistance value, Ω；L is electric melting pipe fittings inductance value, H；U0It is effectively electric to expire waveform for exchange electro-fusion welding machine
Pressure；UAFor the weldingvoltage of electric melting pipe fittings；
(2) output voltage of DC inverter welding machine is compensated
It is right in order to keep actual DC welding process equal with AC welding power when determining welding condition on electric melting pipe fittings
The output voltage of DC inversion electro-fusion welding machine compensates when welding:
Wherein, the equal equation of electric melting pipe fittings bonding power is as follows during guaranteeing two:
Voltage compensation is determined by following formula:
In formula, P is the bonding power of electric melting pipe fittings in welding process；UDIt is DC inversion electro-fusion welding machine after voltage compensation
Actual output voltage, V；UAFor AC welding voltage, V as defined in electric melting pipe fittings welding procedure；λ is to be calculated to obtain by step (1)
Power factor.
3. method according to claim 1 or 2, which is characterized in that before the operation for executing step (1), first according to electric smelting
The welding condition type of pipe fitting, to whether needing to carry out output voltage compensation and confirm；It is used if electric melting pipe fittings are specified
DC voltage is welded, then without carrying out additional output voltage compensation；If electric melting pipe fittings are welded using alternating voltage,
It then needs to compensate output voltage.
4. method according to claim 1 or 2, which is characterized in that electric melting pipe fittings are tested by exchange electro-fusion welding machine
Weldingvoltage UAValue be 39.5V.
5. a kind of DC inversion electro-fusion welding machine with output voltage automatic compensation function, including for loading control function module
Processor；It is characterized in that, be loaded in the processor output voltage for realizing method as claimed in claim 1 or 2 from
Dynamic compensating module；The electro-fusion welding machine further includes the resistance measuring circuit that processor is connected to by conducting wire, for measuring electric smelting pipe
The resistance value of part；It is equipped with the selection key for compensating to output voltage on the operation panel of electro-fusion welding machine, is used for
Selection key that electric melting pipe fittings resistance R is measured before welding, and for input AC electro-fusion welding machine to expire waveform effectively electric
Press U0With the input interface of electric melting pipe fittings inductance value L.
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