CN100491884C - Power-frequency induction gradient temperature heating oven - Google Patents
Power-frequency induction gradient temperature heating oven Download PDFInfo
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- CN100491884C CN100491884C CNB2007100261228A CN200710026122A CN100491884C CN 100491884 C CN100491884 C CN 100491884C CN B2007100261228 A CNB2007100261228 A CN B2007100261228A CN 200710026122 A CN200710026122 A CN 200710026122A CN 100491884 C CN100491884 C CN 100491884C
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Abstract
The invention provides a line-frequency induction temperature-gradient heating furnace, which comprises a material lifting mechanism, a material pushing mechanism, a material conveying mechanism, an inductor, an electrical system. An induction coil coiled by a copper pipe is arranged outside a furnace lining, a water inlet pipe and a water outlet pipe are connected on the copper pipe, the induction coil is composed of a plurality of sections of copper pipes with different pitches and different cross section areas, each section is respectively connected with a power supply, a temperature tough adjustment region is arranged close to the material inlet end, and a temperature fine adjustment region is arranged close to the material outlet end. The induction coil of the inventive heating furnace is composed of copper pipes with different pitches and different cross section areas, and each coil has independent power adjustment and can heat with a temperature gradient curve, so as to meet the requirements of isothermal extrusion process. The invention also has the advantages of lower equipment cost, high degree of automation, low energy consumption, small temperature difference of core and surface, no burning loss, and distinct economic benefit.
Description
Technical field
The present invention relates to the heating of line-frequency induction temperature, relate in particular to a kind of line-frequency induction gradient heating furnace of large-diameter workpiece.
Background technology
As everyone knows, workpiece is heated to be gradient temperature, has certain technical meaning along the Workpiece length direction.For example, send the cylindrical aluminium workpiece or the blank of extrusion die extruding to, the end that blank is introduced into the extrusion die in the extruder requires higher temperature usually.Blank itself is squeezed in extrusion process like this, produce power conversion heating, make progressively elevated temperature of blank rear end, the extruding of realization isothermal, if blank is even heating along its longitudinal axis, the heat affecting that will be squeezed of blank rear end, it is overheated to produce, and causes extrusion die rapid wear, productivity ratio to reduce and the product quality that squeezes out descends.
A kind of method that realizes line-frequency induction gradient heating blank is along the aluminum alloy blank y direction, with the combination of many group induction coils.Each organizes the coil power supply supply frequency is 50 or 60 hertz.When induction coil when the alternating current, induction coil produces alternating magnetic field, the aluminium blank that is in this magnetic field then causes the alternation induced potential, by the electric current of its generation, because of overcoming the resistance of conductor own, is converted to heat energy and heats blank.In order to realize that along blank y direction gradient-heated, fixedly gradient-heated is the end to end from blank, adopts different power densities, form gradient-heated, adjustable gradient-heated is to adopt coil grading, and can adjust watt level separately, and realizes gradient-heated and adjust productivity ratio.
Use the power frequency power supply to help simplifying power supply, application diameter is greater than the heating blank of 80mm.It is " soaking " that the radial temperature of blank requires, and alternating current is when the conductor, along the current density on the cross-sectional area of conductor is not even distribution, maximum current density appears at the surface of conductors layer and is converted into heat energy, at the capacity of heat transmission that relies on blank itself heat energy is conducted to the temperature lower by the temperature eminence, therefore, dark more the even of radial temperature that help more of the depth of current penetration.For example, the aluminium blank that radius is 4 inches during with 60 hertz electric current the optimal penetration degree of depth be 0.8 inch, when adopting 500 hertz of intermediate frequencies, penetration depth has only 0.3 inch, for diameter greater than the suitable employing power frequency more than the 80mm.
Patent 200610083289.3 discloses the method and apparatus with a plurality of coil gradient eddy-current heating or fusing workpiece, and each in a plurality of induction coils is connected to the power supply with the tuning capacitor that is connected across the inverter input.Each inverter has pulsewidth modulation and exchanges output, and it exchanges the output Synchronization Control by the control line between all power supplys with the pulsewidth modulation of other power supply.Equipment investment is higher, and productivity ratio is low, and energy consumption is big, and automaticity is low.
Therefore designing and developing and a kind ofly have axial line-frequency induction gradient heating, adjustable power, core table and have a narrow range of temperature, do not have scaling loss, energy consumption is little, productivity ratio is high full-automatic heating furnace, will be a great technical task.
Summary of the invention
The purpose of this invention is to provide a kind of line-frequency induction gradient temperature heating oven, can realize the axial-temperature gradient heating, radial temperature is even, and the core table has a narrow range of temperature, and segmentation is adjustable separately, satisfies the isothermal extrusion technology requirement preferably by the temperature gradient curve heating.
Purpose of the present invention is achieved through the following technical solutions:
Line-frequency induction gradient temperature heating oven, comprise storing hoisting mechanism, pusher, pass on and expect mechanism, inductor and electrical system, be arranged in the outside of furnace lining with the induction coil of copper pipe coiled, water inlet pipe and outlet pipe are connected on the copper pipe, it is characterized in that: described induction coil is made of in order the copper pipe of the different pitch different cross sections of multistage, and each section connects power supply respectively, divides coarse adjustment humidity province and fine tuning humidity province, near feed end is the coarse adjustment humidity province, is the fine tuning humidity province near discharge end.
Further, above-mentioned line-frequency induction gradient temperature heating oven, described coarse adjustment humidity province is divided into three sections of I, II, III, and I～III section copper pipe pitch is successively decreased with 1.1 ratios, and every section temperature is all independent adjustable; The fine tuning humidity province is that single hop is adjustable separately, and the copper pipe pitch is successively decreased with 1.2 ratios.
Further, above-mentioned line-frequency induction gradient temperature heating oven, three sections coil copper pipes of described coarse adjustment humidity province, wherein, I section and II section copper pipe thickness are 15mm, and mean pitch is 1.86mm, and III section copper pipe thickness is 15mm, and mean pitch is 1.70mm.The thickness of described fine tuning humidity province coil copper pipe is 12mm, and mean pitch is 1.35mm.
Again further, above-mentioned line-frequency induction gradient temperature heating oven, the internal diameter of coil copper pipe are 160～600mm.
Again further, above-mentioned line-frequency induction gradient temperature heating oven, described induction coil adopt insulation wrapping or resin-cast each other.
The outstanding substantive distinguishing features and the obvious improvement of technical solution of the present invention is mainly reflected in:
Line-frequency induction gradient heating furnace of the present invention, inductor coil adopts different pitches and different cross section copper pipe to constitute, each coil power realizes adjustable separately, the heating of satisfied temperature gradient curve, reach the heating efficiency that the fixed temperature gradient curve is 40 ℃/m, the power-adjustable inductor divides two district's multistages, and it is adjustable that crucial gradient-heated is divided into three periods whiles, gradient temperature can reach 60～120 ℃/m, has satisfied the isothermal extrusion technology requirement preferably.Equipment cost is low, automaticity is high, and less energy consumption, core table have a narrow range of temperature, do not have burning phenomenon, can also be applicable to the heating of large-size workpiece better.
Description of drawings
Below in conjunction with accompanying drawing technical solution of the present invention is described further:
Fig. 1: the structural representation of inductor of the present invention;
The D-D cutaway view of Fig. 2: Fig. 1;
The local enlarged diagram of Fig. 3: Fig. 1.
The implication of each Reference numeral among the figure: 1-three-phase furnace transformer, 2-three-phase regulator, 3-induction coil, 4-conductive plate, 5-conduction tube connector, 6-water nozzle, 7-insulating barrier, I-first section coil copper pipe, II-second section coil copper pipe, III-the 3rd section coil copper pipe, IV-the 4th section coil copper pipe.
The specific embodiment
Isothermal hot pin material is in the extrusion modling process, and mechanical energy converts heat energy to and non-homogeneous intensification.Because temperature meeting on the low side causes mould and section bar modification, causes waster.Temperature is too high can only to reduce extrusion speed, causes productivity ratio to descend.Have only the bar of suitable gradient-heated could adapt to the requirement of isothermal extrusion operation.But the bar of unlike material has different extrusion temperatures.Under different pressures and process velocity moulding situation, the intensification situation of being heated is also different, and this will have corresponding gradient-heated equipment.For this reason, mid freqency induction furnace of the present invention can be realized gradient-heated, and each coil is realized independent adjustable power, heated, satisfies isothermal extruding requirement by temperature gradient curve.Every section inductor adopts equal-wattage, different power density, is designed to multistage, divides coarse adjustment and fine tuning, feed end is coarse adjustment, and inductor divides three sections, can regulate watt level simultaneously, discharge end adds one group of short coil in addition, and fine tuning separately is convenient to adjust discharge end temperature height.
The line-frequency induction gradient heating furnace is by the storing hoisting mechanism, pusher, before pass on the material mechanism, inductor, after pass on the material mechanism, hydraulic system and power frequency electrical system etc. are partly formed, sensor structure as shown in Figure 1, induction coil 3 is made of in order the copper pipe of the different pitch different cross sections of multistage, each section connects with power supply respectively, divide coarse adjustment humidity province and fine tuning humidity province, near feed end is the coarse adjustment humidity province, near discharge end is the fine tuning humidity province, it is adjustable that the coarse adjustment humidity province is divided into three periods whiles, and the fine tuning humidity province is that single hop is adjustable separately, regulate the height of discharge end temperature.Line-frequency induction gradient heating furnace inductor internal diameter is 160～600mm, and first section coil copper pipe I, second section coil copper pipe II, the 3rd section coil copper pipe III pitch are successively decreased with 1.1 ratios, and fine tuning district the 4th section coil copper pipe IV ratio is successively decreased with 1.2.For example the internal diameter with diameter 450 * 1500mm heating furnace inductor is 520mm, and I section and II section copper pipe thickness are 15mm, and mean pitch is 1.86mm, III section copper pipe thickness is 15mm, mean pitch is 1.70mm, and IV section copper pipe thickness is 12mm, and mean pitch is 1.35mm.I, II, III section coil insert three-phase furnace transformer 1 secondary side respectively, and IV section coil inserts the secondary side of three-phase regulator 2.Conductive plate 4 is used as being connected water-cooled cable with conduction tube connector 5.As Fig. 2, water inlet pipe and outlet pipe are connected on each water route copper pipe by water nozzle 6.Induction coil adopts the insulation wrapping to handle each other, and is shown in Figure 3, and induction coil also can adopt resin-cast to handle each other, to prevent turn-to-turn short circuit.
It should be noted that the storing hoisting mechanism: hydraulic pressure lift send a material at every turn.Pusher is by hydraulic drive.Before pass on the material mechanism form by frame, dolly and chain drive system, conveying work pieces arrives each fire door.Inductor comprises induction coil, end plate, hinders closed inner bag, the compound thermal insulating layer of high strength, guide rail, water-cooling system, conducting system etc. entirely; Induction coil is designed to multistage, divides coarse adjustment and fine tuning, and feed end is coarse adjustment, divides three sections, and three phase supply can be regulated watt level simultaneously, and discharge end adds one group of short coil, and also three phase supply is regulated discharge end temperature height.Existing induction furnace inner bag generally adopts closed type or open type, and closed type efficient is low, and the present invention hinders closed inner bag entirely for open type, adopts high strength, insulation porcelain bar to hinder closing structure entirely.Big at being used for diameter, length is long, the heating furnace of the heated parts of Heavy Weight, be to adopt the knotting body not establish inner bag or add the insulation liner at present both at home and abroad with inner bag, the former is fragile, the repair and replacement difficulty, the latter is because of insulation pad insufficient strength, hold and can't stand the load of reheating, produce distortion, form bending, cause the input and output material difficulty, the present invention adopts the compound thermal insulating layer of high strength to add the closed inner bag of full resistance, bearing the fireproof insulation brick that thermic load partly serves as a contrast sufficient intensity, remainder adopts alumina silicate fiber felt, has overcome all disadvantages of prior art, long service life.Water-cooling system is made up of water inlet pipe and water outlet pipe, gate valve and filter etc., is divided into some water routes, and each water route of outlet pipe all is provided with the electric contact bimetallic thermometer, when water temperature surpasses set point of temperature, just reports to the police automatically; Water-cooling system is contained on the underframe of inductor, and for guaranteeing safety and prevent dust and be convenient to and observe that inductor is covered by the case of nonmagnetic metal frame strip lucite observation window, compensation condenser is equipped with in the inductor bottom.After pass on the material mechanism form by frame, dolly and chain drive system.The power frequency electrical system is by computer monitoring, PLC machine Automatic Control.For ease of installation and maintenance, storing hoisting mechanism, pusher, preceding pass on material mechanism, inductor, after to pass on material mechanism, power frequency electrical system be respectively independently whole.
What be worth emphasizing is, induction coil of the present invention adopts different pitches and different cross section copper pipe to constitute, reach the heating efficiency that the fixed temperature gradient curve is 40 ℃/m, the power-adjustable inductor divides two district's multistages, crucial gradient-heated district is adjustable separately, the preheating zone be divided into three sections adjustable, total gradient temperature can reach 60～120 ℃/m, the isothermal extrusion technology requirement is satisfied in the heating of realization thermograde.The induction furnace inductor all is designed to segmental averaging power is set both at home and abroad, and induction coil of the present invention adopts different pitches and different Cu tube section to combine, and is divided into multistage, and control different capacity density has the function that realizes the gradient-heated temperature curve.Gradient-heated stove both domestic and external is average segmentation, equal-wattage, adjustable separately.This method is too complicated, has increased equipment investment.Inductor of the present invention divides coarse adjustment and fine tuning, regulates each section watt level, sets up to have the heating efficiency of adjusting temperature gradient curve, realizes evenly heating and obtains desirable temperature gradient curve along its length, satisfies the isothermal extrusion operation.Coil adopts manually or automatically to be regulated, and satisfies gradient-heated, safeguards easy to use, the saving equipment investment.
Gradient-heated is the novel mode of heating that adapts to follow-up extrusion process, and the isothermal bar must have suitable gradient temperature scope could adapt to the needs of isothermal extrusion operation in the extrusion modling process.Adjust watt level according to productivity ratio and temperature gradient.Concrete debugging is to carry out on the line-frequency induction gradient heating furnace of diameter 450 * 1500mm.Put 4 aluminium ingot material in the stove, heating is sent in stepping, and when the position of the 4th material, the head of furnace charge is in heat temperature raising under the high power density, when temperature measuring mechanism records temperature, and discharging immediately.Temperature adopts the far infrared temperature measurer to measure: every data all reach technological requirement, 77.6 ℃/m of aluminium ingot axial temperature difference, radial temperature difference＜15 ℃, unit power consumption 246KW.h/t, no scaling loss or hot-spot phenomenon, guaranteed that best extrusion speed and adequate remedy aluminium ingot cause the temperature difference owing to frictional heating in extrusion process, thermograde has met the process conditions of expectation, and complete set of equipments runs well, computer, PLC regulator control system are normal, move errorlessly, opening and closing lid is normal, in the stove in order.
Prove through application in practice, gradient induction heater of the present invention, in engineer testing and the industry good result that obtained in service, better satisfied the requirement of isothermal extrusion technology, product quality and productivity ratio have been significantly improved, save the energy, reduced production cost, realized the integrated of technological equipment, can also satisfy the requirement of large-tonnage extruder extrusion process.
Below only be concrete exemplary applications of the present invention, protection scope of the present invention is not constituted any limitation.All employing equivalents or equivalence are replaced and the technical scheme of formation, all drop within the rights protection scope of the present invention.
Claims (6)
1. line-frequency induction gradient temperature heating oven, comprise storing hoisting mechanism, pusher, pass on and expect mechanism, inductor and electrical system, inductor comprises the induction coil with the copper pipe coiled, copper pipe is arranged in the outside of furnace lining, water inlet pipe and outlet pipe are connected on the copper pipe, it is characterized in that: described induction coil is made of in order the multistage copper pipe, copper pipe in every section has different pitch different cross sections, each section connects power supply respectively, divide coarse adjustment humidity province and fine tuning humidity province, near feed end is the coarse adjustment humidity province, is the fine tuning humidity province near discharge end.
2. line-frequency induction gradient temperature heating oven according to claim 1 is characterized in that: described coarse adjustment humidity province is divided into three sections of I, II, III, and each copper pipe pitch in every section is all successively decreased with 1.1 ratios, and every section temperature is all independent adjustable; The fine tuning humidity province is that single hop is adjustable separately, and the copper pipe pitch is successively decreased with 1.2 ratios.
3. line-frequency induction gradient temperature heating oven according to claim 2 is characterized in that: three sections copper pipes of described coarse adjustment humidity province, wherein, I section and II section copper pipe thickness are 15mm, mean pitch is 1.86mm, and III section copper pipe thickness is 15mm, and mean pitch is 1.70mm.
4. line-frequency induction gradient temperature heating oven according to claim 2 is characterized in that: the thickness of described fine tuning humidity province copper pipe is 12mm, and mean pitch is 1.35mm.
5. line-frequency induction gradient temperature heating oven according to claim 1 is characterized in that: the internal diameter of copper pipe is 160～600mm.
6. line-frequency induction gradient temperature heating oven according to claim 1 is characterized in that: described induction coil adopts insulation wrapping or resin-cast each other.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100261228A CN100491884C (en) | 2007-08-15 | 2007-08-15 | Power-frequency induction gradient temperature heating oven |
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| CNB2007100261228A CN100491884C (en) | 2007-08-15 | 2007-08-15 | Power-frequency induction gradient temperature heating oven |
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| CN100491884C true CN100491884C (en) | 2009-05-27 |
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Cited By (1)
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| CN102927824A (en) * | 2012-11-09 | 2013-02-13 | 广东富华重工制造有限公司 | Axis body gradient induction intermediate frequency heating furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102927824A (en) * | 2012-11-09 | 2013-02-13 | 广东富华重工制造有限公司 | Axis body gradient induction intermediate frequency heating furnace |
| CN102927824B (en) * | 2012-11-09 | 2015-07-08 | 广东富华重工制造有限公司 | Axis body gradient induction intermediate frequency heating furnace |
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