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The core and the application of high frequency induction heating furnace technology
Along with the electronic?technology?rapid,?the original?use of?high frequency induction furnace?furnace?power?feelingbroad?has been set?solid state circuit?static variable frequency power supply?gradually?sweep.?High frequency induction furnace?has been widely used?in?cast iron,?casthomework?and?she?agglutination?and so on,?and because it issuitable for?batch?(batch)?work?on?molten metalsolidification?and?stirring force?adjustable?characteristic,make?its application in?steel?smelting?and nonferrous metalconsolidation?heat-resistant alloy?has?a shrinking.
The principle of medium frequency furnace
Induction furnace is the?application of electromagnetic induction?principle?to transfer the energy?to?the charge of metal,?electricity?can?transform?into?a resistance heating mode?heat energy?to?have a fever?and melted?metal charge.Power solid state?medium frequency furnace?is a fixedfrequency power supply?for?power semiconductor devices,usually?a?AC-DC-AC inverter?and?AC – DC?inverter?two.?Soto?feel?heating,?must meet two?conditions: one is the?use of alternating current;?two is the?required?heating?the object is metal?materials.
High frequency?induction heating furnace?according to the organization,?the crucible?type?(i.e.,?occasionallyfurnace)?and?groove type?(i.e.,?deliberately?furnace)?two categories,?the?first?is?used,?heat preservation andpouring.?While?high frequency furnace?frequency?range?to0.05-10KHZ,?mainly?applied to the steel?and non-ferrous metal?smelting and?heat preservation.?The use ofintermediate frequency?electric furnace?interests?feeling:
(1)?high power density,?high speed,?convenient?batchmelting,?suitable for?energy saving?of aggregation;
(2)?using sensitive and?convenient?operation,?suitable for the?constantly changing the?agglutination?metal varietiesplace;
(3)?determines the?power?frequency,?the?intermediate frequency?electric furnace?is more suitable for lightfeeling?of non-ferrous metal?melting;
(4)?because of?the high power density,?no phase?equilibriumapparatus,?small?civil?charges;
(5)?the intermediate frequency?electric furnace?molten metalfeeling?exists only?a “overheating”?situation,?which in thefield of metallurgy?popular;
(6)?way of?automatic?control?equipment,?if?feel?frequencyfurnace operation?to?the diagnosis?and?monitoring of furnace condition?can be?obtained by summing?machine,?greatly reducing the?rest?strength,?improve the?task?to.
High frequency?induction furnace?is?high,?has the function of?adjustable frequency,?low noise,?small size,?light weight,?simple installation,?maintenance?simple?controlmany?benefits,?I plant?began to?application of intermediate frequency?furnace?to?find?gold and silver recovery?processproduction?in 2001,?and got?very good effect,?in practicehave accumulated?good?teaching.?At present?in the?gold and silver?beads,?condensation,?quenching?effect?to accept,alloy?melting,?assaying and sampling?and other aspects ofthe?work?for?suitable for their own?color,?successfullycompleted?more?streamlined?students?create?task.?However,the use of?intermediate frequency?electric furnace?in recent years?feeling,?also have?some questions.?If?according to the material?difference?resolution?crucible materials,models;?selection of?lining?and?refractory raw materialsand?furnace building?skills;?improve?work?conditions such as?revocation of?dust,?noise?and temperature?rise;?silicon rectifier?and thyristor?converter?equipped with?task?occurs when the?harmonic current and?harmonic. The?pollution of the grid,?and?how to improve the?power?factor?and so on.?As usual?if?feel?furnace?manufacturers?equipment?production,has?a variety of?concerns,?such as cooling?water pressure is low,?the water temperature is too high?pressure and temperature?concerns,?over current and short?of concern for the people,?owe?voltage?concerns,?lack of?pity,?cruciblefurnace leakage?and main circuit?grounding?annotation?etc..
But?we should?also?pay attention to?the following pointswhen in use:
(1)?the boot?operation before?should first?visit?the value of the supply voltage?and the?three-phase?equilibrium;
(2)?the connection?of electrical contact?search carefully,especially the?SCR?reactor,?water-cooled cable?electriccapacitor,?etc.;
(3)?open?water?circulating cooling water?system?to check the?host,?furnace body?water?operation and?adhere tocertain;
(4)?lining sintering?and?baking?to reduce?electromagnetic stirring?and persuaded the?corrosion to the?lining,?to?low power operation?(Fei Teng?voltage)?for a period of time,the?heating?furnace?homogeneous;
(5)?in normal operation,?but also?should?patrol?operationequipment,?rated?water temperature in each?Road?branch,there are?instructions?can also be composed of?sound?changedecisive?equipment?can be normal;
(6)?may be appropriate to?reduce?high frequency furnace?to discontinue the use?of cooling water,?but not?closed?cooling water,?otherwise?the?coil and?lining?heat?insulating layergrinding;
(7)?in the melting?dominate,?no?(A)?found?lining?of serious damage,?continued?melting;?(B)?cooling water?stop running;?(C),?the furnace body?is equipped with?no?good grounding;?(D)?in electric?power?and do not?have?safeprotection?when?charging,?French?ramming?solid charge,sampling,?adding a small amount of?alloy,?temperature,?slagand other?homework;?although,?daily maintenance and?testwork by?medium frequency induction furnace?as?should pay attention to?equipment,?in particular?to be?anti?moisture,acid proof,?alkali?gases?erosion on?electronic components,send?all kinds of hazards,?resist the?affairs?and ensuresafety in?production?for a long time.