CN102226638A - Induction-type tank welding seam drying and heating device - Google Patents
Induction-type tank welding seam drying and heating device Download PDFInfo
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- CN102226638A CN102226638A CN2011100778902A CN201110077890A CN102226638A CN 102226638 A CN102226638 A CN 102226638A CN 2011100778902 A CN2011100778902 A CN 2011100778902A CN 201110077890 A CN201110077890 A CN 201110077890A CN 102226638 A CN102226638 A CN 102226638A
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Abstract
The invention discloses an induction-type tank welding seam drying and heating device which comprises a heating circuit and a heating body, wherein the heating body comprises a bottom frame, an upper cover, a temperature sensor, a fan, microcrystalline glass, a coil plate and a magnetic block; and the heating circuit comprises an induction heating inverter major loop and a control circuit. In the device provided by the invention, the high-frequency induction vortex thermal effect technology is applied to the tank welding seam drying device first domestically, and the technologies of embedded-type loop control, full-cavity shield thick film integrated circuit design, electromagnetic compatible design and the like are integrated first, and a full-cavity shield structure design technology of metal outer shell shield, multi-layer printed board, twisted shield cable, embedded molding magnetic strips and the like is adopted first.
Description
Technical field
The present invention relates to tank body heater field, be specially a kind of induction type can seam drying and heating device.
Background technology
Metal can is one of the most frequently used packaged form, is widely used in industry-by-industries such as food, chemical industry, medicine.Can seam coating stoving process is a requisite critical process in the metal system jar production process.At present, mainly adopt natural gas, liquefied gas heating, drying device, resistance wire current-carrying heating, drying device, defectives such as ubiquity heater life-span weak point, inefficiency, energy consumption height, percent defective height, work control accuracy difference.
Summary of the invention
The purpose of this invention is to provide a kind of induction type can seam drying and heating device, low with the heater efficient that solves prior art, energy consumption is high, the problem of work control accuracy difference.
In order to achieve the above object, the technical solution adopted in the present invention is:
Induction type can seam drying and heating device, it is characterized in that: include heater circuit and heater body, described heater body comprises underframe, and cover loam cake at the underframe top, described loam cake is provided with temperature sensor, described loam cake, the space that underframe surrounds constitutes the air channel, described underframe one end is as air inlet, be positioned at described air inlet place the blower fan of air outlet towards described air channel is installed, be installed with devitrified glass on the described underframe frame wall, a plurality of be one another in series or coil panel in parallel is distributed on the devitrified glass of described frame wall arranged, and the upper surface of each coil panel all posts magnet piece;
Described heater circuit comprises eddy-current heating inverter major loop, control circuit, described eddy-current heating inverter major loop comprises filter circuit successively, the AC/DC three-phase bridge is controlled rectifier circuit not, DC/DC chopper circuit device circuit, the DC/AC full-bridge inverter circuit, the series resonance load circuit, described control circuit comprises the closed control circuit based on DSP, the output of DSP in the described control circuit inserts the filter circuit of eddy-current heating inverter major loop, and the coil panel in the described heater body leads to lead-in wire and inserts in the series resonance load circuit in the eddy-current heating inverter major loop.
Described induction type can seam drying and heating device is characterized in that: heater circuit, heater body place different metal shells respectively separately.
Described induction type can seam drying and heating device is characterized in that: described eddy-current heating inverter major loop, control circuit are arranged on the printed circuit board (PCB) of different layers respectively separately, and adopt full cavity shielding thick film circuit technique thick film integrated respectively.
Described induction type can seam drying and heating device is characterized in that: the high frequency cable line interface of the lead-in wire that the coil panel in the described heater body is drawn by band shielding inserts in the series resonance load circuit in the described eddy-current heating inverter major loop.
Described induction type can seam drying and heating device is characterized in that: the filter circuit of described eddy-current heating inverter major loop is a M formula low pass filter.
Described induction type can seam drying and heating device is characterized in that: described AC/DC three-phase bridge not controlled rectifier circuit is made of the power diode three-phase commutation bridge.
Described induction type can seam drying and heating device is characterized in that: described DC/AC full-bridge inverter circuit is made of the triode full-bridge circuit.
The alternative existing natural gas of the present invention, liquefied gas heating, drying equipment, resistance wire current-carrying heating, drying equipment.Its key technology is that high-frequency induction vortex heat technology is applied to the can seam drying unit, on circuit design, and technology such as integrated embedded Control, high-frequency inversion, the design of full cavity shielding thick film integrated circuit, EMC Design; In the frame for movement design, adopt full cavity shielding construction design, efficiently solve the electromagnetic radiation of high frequency induction heater to environment.
Theoretical foundation of the present invention comprises: the law of electromagnetic induction, Lenz's law, Joule's law, the Kelvin effect of high frequency electric, kindred effect, ring-around.Placed the magnetic force line cutting in high-frequency alternating magnetic field formation magnetic field to be in the tank body magnetisable material in magnetic field by the tank body of oven dry heating, according to Faraday's electromagnetic induction law, produce the eddy current of inducting on perpendicular to magnetic line of force tank body cross section, eddy current forms heat energy to the tank body heating, drying according to joule heating effect of current in the impedance that conduction tank body material presents.
Advantage of the present invention is:
(1) takes the lead at home high-frequency induction vortex heat technology is applied to the can seam drying unit, adapt to the growth requirement of tank body production line high-speed, low consumption, environmental protection, automation and safety in production.
(2) technology such as integrated embedded closed-loop control, the design of full cavity shielding thick film integrated circuit, EMC Design that take the lead at home, both eliminated the influence of high-frequency electromagnetic interference to control circuit, realize multi-parameter closed loop feedback such as power, temperature, time again, automatically regulate tank body heating-up temperature and penetration depth, operating accuracy is controlled at ± 1% in.
(3) take the lead in adopting full cavity shielding construction designing technique such as metal shell shielding, multilayer board, stranded shielded cable, produced by insert molding magnetic stripe at home, can prevent effectively that electromagnetism from leaking outside, solve the electromagnetic radiation of high frequency induction heater to environment, and the electromagnetic interference problem of the interior circuit of solution machine.
Description of drawings
Fig. 1 is heater body structural representation among the present invention.
Fig. 2 is a heater circuit theory diagram of the present invention.
Fig. 3 is heater circuit figure of the present invention.
Fig. 4 is a heater switch board structure chart.
The specific embodiment
As shown in Figure 1.Heater body 1 includes underframe 2 and covers on loam cake 3 on the underframe 2, and 2 of loam cake 3 and underframes are surrounded by the air channel; The air inlet position in air channel is equipped with blower fan 4, in the air outlet subtend air channel of blower fan 4.Be installed with devitrified glass on the underframe 2 frame walls, arranged distribution has some coil panels in series or in parallel with each other 5 on the devitrified glass, and the upper surface of each coil panel 5 all posts magnet piece.On the loam cake 3 temperature sensor is installed.
In the course of work, tank body is placed on the driving-belt, is transported to the other end of driving-belt from an end of driving-belt, in the process that is transferred, constantly is heated the body heating, and then reaches the effect with weld seam oven dry on the tank body.
As Fig. 2, shown in Figure 3.Heater circuit comprises eddy-current heating inverter major loop, control circuit, eddy-current heating inverter major loop comprises filter circuit, AC/DC three-phase bridge not controlled rectifier circuit, DC/DC chopper circuit device circuit, DC/AC full-bridge inverter circuit, series resonance load circuit successively, wherein filter circuit is a M formula low pass filter, AC/DC three-phase bridge not controlled rectifier circuit is made of the power diode three-phase commutation bridge, and the DC/AC full-bridge inverter circuit is made of the triode full-bridge circuit.Control circuit comprises the closed control circuit based on DSP, the output of DSP in the control circuit inserts the filter circuit of eddy-current heating inverter major loop, and the coil panel in the heater body leads to lead-in wire and inserts in the series resonance load circuit in the eddy-current heating inverter major loop.
As shown in Figure 4, be provided with a plurality of movements 7 in the cabinet 6, the cabinet top is equipped with display board 8, and heater circuit is whole to be integrated in the movement 7 of cabinet 6.
Theoretical foundation of the present invention comprises: the law of electromagnetic induction, Lenz's law, Joule's law, the Kelvin effect of high frequency electric, kindred effect, ring-around.
Placed the magnetic force line cutting in high-frequency alternating magnetic field formation magnetic field to be in the tank body magnetisable material in magnetic field by the tank body of oven dry heating, according to Faraday's electromagnetic induction law, produce the eddy current of inducting on perpendicular to magnetic line of force tank body cross section, eddy current forms heat energy to the tank body heating, drying according to joule heating effect of current in the impedance that conduction tank body material presents.
Eddy-current heating inverter major loop is a resonant network, and it is made up of inductance L, capacitor C and equivalent resistance R, the intrinsic frequency of resonant tank
By parameter L, C decision,
=
In heating process, because of causing the physical characteristic parameter of heating object and equiva lent impedance, variations in temperature changes, make the intrinsic frequency of load circuit
Change, and be a nonlinear system, if this moment eddy-current heating inverter major loop operating frequency
Untimely tracking
, switching frequency is with the off-resonance frequency, and eddy-current heating inverter major loop will be operated in the hard switching state, at high frequency, under the high-power situation, power device bears very high electric stress, loss increases, and causes the security and the reliability decrease of eddy-current heating inverter major loop.Simultaneously, because voltage and current homophase not, power factor is low, does not reach peak power output, and the efficient of power supply and capacity utilization rate reduce.For this reason, must adopt the frequency-tracking control technology, make the operating frequency of eddy-current heating inverter major loop
In the resonant tank intrinsic frequency
Near, promptly
=
, this moment voltage and electric current homophase, power factor is approximately 1, the output of acquisition peak power, switching device also is operated in ZVS, ZCS commutation states, and loss reduces, simplify switching device additional absorption circuit, helped high frequencyization, the high capacity of high-frequency induction heating power.
Adopt digital signal processor DSP to realize phase-locked and frequency-tracking,, when the output impedance and the load of power supply reach coupling, in load, can obtain peak power and export according to the electrotechnics principle.Induction heating power is in heating process, and load impedance changes because of variations in temperature, is refracted to elementary equiva lent impedance and also changes.Simultaneously, specific heating power supply heats different loads (workpiece object), and load is refracted to elementary equiva lent impedance also very big-difference.Because above-mentioned two kinds of situations change the resonant frequency of resonant network, equivalent load changes, if untimely adjusting makes induction heating power and load matched, power supply just can not be in load Maximum Power Output, cause operating efficiency to reduce, the security of power supply also can descend.It is similar whether this phenomenon and frequency follow the tracks of.
It is that skewer is gone into transformer between power supply and load that load impedance mates modal way, by changing the no-load voltage ratio of coupling transformer, realizes the load impedance coupling,
=
, n is that transformer is first, inferior turn ratio,
,
Be respectively first, inferior impedance.The limitation that the load matched that adopts transformer tapping to change turn ratio realization induction heating power has it to use, at first be more extensive, not meticulous, do not reach the matching precision requirement, when secondly being the tap conversion, the converter that needs a constant volume is as control contactor.Adopting electronic technology to realize the automatic load coupling, is the only way of modern induction heating power development.With respect to the transformer matched load, circuit structure is simple, and weight and volume is little, and coupling available digital processor is finished, and realizes digitlization, high precision coupling.The electronics automatic load mates the density (PDM) of the driving control impuls that can pass through adjusting eddy-current heating inverter and regulates the phase shift ways such as (PSM) that the converter bridge switching parts power device drives control impuls, reaches automatic coupling.
Among the present invention, the high frequency cable line interface of the lead-in wire that the coil panel in the heater body is drawn by band shielding inserts in the series resonance load circuit in the described eddy-current heating inverter major loop.
Among the present invention, leak outside, cause electromagnetic pollution, for the interference of electromagnetism in the minimizing machine, adopted the shielding construction design simultaneously, comprise design contents such as metal shell shielding, multilayer board, stranded shielded cable, produced by insert molding magnetic stripe circuit for preventing electromagnetism.
Among the present invention, heater circuit, heater body place different metal shells, particularly heater circuit to use full cavity electromagnetic shielding respectively separately, by metal shell shielding electromagnetic wave.
Among the present invention, eddy-current heating inverter major loop, control circuit are arranged on the printed circuit board (PCB) of different layers respectively separately, the components and parts of control circuit and eddy-current heating inverter major loop are installed in respectively on two printed circuit boards, adopt two-sided or multilayer board as far as possible, reduce lead-in wire and connect.Connect as the needs lead-in wire, should adopt stranded shielded cable, avoid the electromagnetic interference of forceful electric power the weakness circuit.Control will be away from layout with power connection wire, and the ground that the Power Groud line current does not allow to flow through control circuit forms the loop.
Among the present invention, coil panel generally has a segment distance from the output interface of heater circuit in use.The lead-out wire of coil panel need adopt the high frequency cable line interface of band shielding, can reduce loss on the one hand, can prevent high frequency radiation in addition.Coil panel periphery produced by insert molding magnetic stripe.The one, be the magnetic line of force formation low-resistance closed-loop path of coil panel, reduce the scattering or the leakage field of magnetic flux, improve the efficient of electromagnetic oven.The 2nd, can avoid the magnetic flux scattering to cause near peripheral magnetic conductor hardware to generate heat because of forming inductive loop.The 3rd, play a part fixing, support heater coil.
The coil panel parts are heavier, need be installed on the firm member.Answer the position relative fixed after the coil panel shaping, non-deformable, loose, tilt, fastening reliable, avoid causing in transportation and the use loosening, be out of shape, come off, influence adds thermal effect and maybe can't use.
Coil panel and be heated heat-resisting, thermal insulation layer between the workpiece.Shape, curvature want consistent, and evenly, closely, air-gap separation is regulated suitably, to obtain maximal efficiency.
Coil panel is as the part of eddy-current heating inverter major loop series resonance load circuit, under the series resonance situation, voltage on it is Q times of eddy-current heating inverter major loop input voltage, and the voltage peak-to-peak value VL=± 1.5kV of coil panel is about 3kV during peak power.Therefore require the fixed coil dish insulating materials and around fixed component, gap want to bear required withstand voltage.Also need waterproof and moisture preventive measure in addition,, the possibility that punctures takes place in order to avoid dielectric strength reduces.
The present invention during the assembling of working face hardware, must add waterproof grommet, prevents to leak and soaks heater circuit and heater body, reduces electric insulation, adopts metal shell to prevent electromagnetic leakage simultaneously.
Among the present invention, eddy-current heating inverter major loop, control circuit adopt full cavity shielding thick film circuit technique thick film integrated respectively.Thick film integrated circuit is to adopt on the potsherd insulating bodies at main control module, adds the integrated circuit that components and parts such as semiconductor integrated circuit constitute.Eddy-current heating inverter major loop adopts full cavity shielding thick film circuit technique, and thick film integrated (the about 70*30*12mm3 of appearance and size) makes the complete machine line seldom, stops the influence of high-frequency electromagnetic interference to power control system.The shielding of cavity external application metal aluminum foil, circuit safety is reliable, and stability is high.
Among the present invention, filter circuit is by inductance coil, the ∏ type L C low pass filter that capacitor is formed, the qualification that it is based on noise band is used for realizing to Noise Suppression, only allow the electric current of power frequency 50Hz to pass through, to other High-frequency Interference noises application qualification attenuation in various degree, the noise frequency difference, noise is different by the attenuation of wave filter, noise attentuation or rejection are not unique for specific line filter thus, and the attenuation of noise on each frequency considered in design, to satisfy wave filter in the interference noise frequency range of a broad, obtain higher and satisfied attenuation, finally reach electromagnetic compatibility requirements.Be suitable for line filter of the present invention, what the present invention adopted is M formula low pass filter, can suppress high-frequency noise.
Among the present invention, in induction heating power, the control mode of rectification circuit mainly is a not controlled rectifier circuit of AC/DC three-phase bridge, utilizes forward conduction, the reverse blocking voltage natural commutation of power diode, need not any control executive circuit.Adopt three-phase not control rectification, the harmonic voltage, the harmonic current that produce are more much smaller than IGCT full-controlled rectifier device, to the pollution of electrical network with influence little, need not to take special harmonic wave control measure in the net side, and the AC/DC three-phase bridge controlled rectifier circuit is not simple, in modern induction heating power, use general.When adopting the AC/DC three-phase bridge not during controlled rectifier circuit, power adjusting is by the frequency modulation Power Regulation, promptly changes the triggering frequency of inverter power switching device, promptly so-called PFM Power Regulation.
Among the present invention, the DC/DC chopper circuit is realized power adjusting and frequency-tracking, its advantage be simple in structure, control is convenient, power factor is high, harmonic wave is little, relatively little to electric network pollution, and can under upper frequency, work.
Among the present invention, DC/AC full-bridge inverter circuit industry induction heating power requires to have big power output, especially for metal heat treatmet, induction heating powers such as melting, power output at hundreds of kW to thousands of kW.Though the DC/AC full-bridge inverter circuit is more complicated slightly than half-bridge circuit, but at the device for power switching of selecting for use with the half-bridge same size, when promptly electric current was identical, full-bridge converter can obtain 2 times of power outputs to half-bridge circuit, therefore, the present invention adopts the full-bridge inverter circuit structure.
Among the present invention, adopt of the load of series resonance (SRC) load circuit as eddy-current heating inverter major loop.
Control circuit of the present invention mainly is according to induction power supply Power Regulation mode, adopts the power closed-loop control (Power Regulation of inversion side) based on DSP, is frequency modulation Power Regulation (PFM).Gather input and output electric current, input voltage, phase place in real time; power device, coil panel and resonant capacitance temperature; data such as leakage current realize over-current detection and protection, functions such as input line voltage overvoltage and under-voltage protection, input electric network source open-phase protection, overtemperature protection, earth leakage protective.
Claims (7)
1. induction type can seam drying and heating device, it is characterized in that: include heater circuit and heater body, described heater body comprises underframe, and cover loam cake at the underframe top, described loam cake is provided with temperature sensor, described loam cake, the space that underframe surrounds constitutes the air channel, described underframe one end is as air inlet, be positioned at described air inlet place the blower fan of air outlet towards described air channel is installed, be installed with devitrified glass on the described underframe frame wall, a plurality of be one another in series or coil panel in parallel is distributed on the devitrified glass of described frame wall arranged, and the upper surface of each coil panel all posts magnet piece;
Described heater circuit comprises eddy-current heating inverter major loop, control circuit, described eddy-current heating inverter major loop comprises filter circuit successively, the AC/DC three-phase bridge is controlled rectifier circuit not, DC/DC chopper circuit device circuit, the DC/AC full-bridge inverter circuit, the series resonance load circuit, described control circuit comprises the closed control circuit based on DSP, the output of DSP in the described control circuit inserts the filter circuit of eddy-current heating inverter major loop, and the coil panel in the described heater body leads to lead-in wire and inserts in the series resonance load circuit in the eddy-current heating inverter major loop.
2. induction type can seam drying and heating device according to claim 1 is characterized in that: heater circuit, heater body place different metal shells respectively separately.
3. induction type can seam drying and heating device according to claim 1, it is characterized in that: described eddy-current heating inverter major loop, control circuit are arranged on the printed circuit board (PCB) of different layers respectively separately, and adopt full cavity shielding thick film circuit technique thick film integrated respectively.
4. induction type can seam drying and heating device according to claim 1 is characterized in that: the high frequency cable line interface of the lead-in wire that the coil panel in the described heater body is drawn by band shielding inserts in the series resonance load circuit in the described eddy-current heating inverter major loop.
5. induction type can seam drying and heating device according to claim 1 is characterized in that: the filter circuit of described eddy-current heating inverter major loop is a M formula low pass filter.
6. induction type can seam drying and heating device according to claim 1 is characterized in that: described AC/DC three-phase bridge not controlled rectifier circuit is made of the power diode three-phase commutation bridge.
7. induction type can seam drying and heating device according to claim 1 is characterized in that: described DC/AC full-bridge inverter circuit is made of the triode full-bridge circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011100778902A CN102226638A (en) | 2011-03-30 | 2011-03-30 | Induction-type tank welding seam drying and heating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100778902A CN102226638A (en) | 2011-03-30 | 2011-03-30 | Induction-type tank welding seam drying and heating device |
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| CN102226638A true CN102226638A (en) | 2011-10-26 |
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| CN2011100778902A Pending CN102226638A (en) | 2011-03-30 | 2011-03-30 | Induction-type tank welding seam drying and heating device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104815787A (en) * | 2015-04-23 | 2015-08-05 | 合肥顺昌电磁感应科技有限公司 | Metal can coating electromagnetic induction automatic drying heating device |
| CN111466073A (en) * | 2017-12-19 | 2020-07-28 | 维斯塔斯风力系统集团公司 | Method for operating a plurality of chopper circuits |
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| CN1047276C (en) * | 1990-11-30 | 1999-12-08 | 苍鹭技术股份有限公司 | Induction dryer and magnetic separaior |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104815787A (en) * | 2015-04-23 | 2015-08-05 | 合肥顺昌电磁感应科技有限公司 | Metal can coating electromagnetic induction automatic drying heating device |
| CN111466073A (en) * | 2017-12-19 | 2020-07-28 | 维斯塔斯风力系统集团公司 | Method for operating a plurality of chopper circuits |
| CN111466073B (en) * | 2017-12-19 | 2023-08-15 | 维斯塔斯风力系统集团公司 | Method for operating a plurality of chopper circuits |
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Application publication date: 20111026 |