CN1047276C

CN1047276C - Induction dryer and magnetic separaior

Info

Publication number: CN1047276C
Application number: CN92103528A
Authority: CN
Inventors: 罗伯特·A·史伦吉
Original assignee: Grey Heron Technology Co ltd
Current assignee: Grey Heron Technology Co ltd; Heron Technologies Inc
Priority date: 1990-11-30
Filing date: 1992-05-11
Publication date: 1999-12-08
Anticipated expiration: 2007-05-11
Also published as: EP0776146B1; EP0583242A4; EP0583242A1; DE69132177T2; EP0583242B1; EP0776146A3; JPH06510622A; CN1080454A; DE69128096D1; WO1992009397A1; ZA923420B; EP0776146A2; DE69132177D1; DE69128096T2

Abstract

The present invention relates to a device used for heating a cover of a metal tank in an induction mode. The device comprises core bodies which have high magnetic conductivity and low electric conductivity, wherein the core bodies are provided with at least two pole parts whose magnetic properties are opposite, and the pole parts point to a transport path of a cover of each metal tank. High frequently alternating current is exerted on windings of the core bodies, and therefore, ac heating current is induced in the cover of the metal tank. The inner part of the cover of the metal tank is fully heated so that moisture is removed. The core bodies can form an E shape. The core bodies can be positioned along each longitudinal position of the transport path and/or around each radial position of the transport path to become into a mould train. The present invention can also comprise a temperature controller of a closed circuit in order to prevent an article sealed in each metal tank from being overheated in case of accidental stop of a production line.

Description

Electromagnetic induction heating device

The present invention relates to a kind of method that heats or otherwise handle metal object, be particularly related to the method and apparatus of handling metal cover or closure with induction mode heating or other modes, for drying, curing or other purposes, be used for making keeping a space therebetween and promoting these objects along a path.

It is circular that the closure of metal beverage container is generally, and has a flange perimeter that is called crimping.These closures system usually are made from aluminum or steel, and crimping then is used for via an operating of contacts this closure being appended to tank body.For helping to form sealing integrity between tank body and closure, usual way is for applying the connection pearl of sealer in this crimping when this closure is made.Dissimilar coatings also selectively or usually is applied to the metal can closure for for example repairing damaged coating of various other purposes.

A problem that takes place in this manufacture process is the curing or the drying of these coatings.Recently water base sealer being used for the existing institute of Container Industry increases, and these sealers are possible must to be reached ten talentes and be dried to acceptable state so that this closure is applied to a metal can.With regard to the coating of solvent, this is not serious problem, because this volatile solvent can evaporate rapidly, and degree of drying generally can put on a metal can with closure in 24 to 48 hours.

In the past, metal can closure system is usually heated by infrared radiation or Convective Heating method, assists drying or solidification process.These systems, particularly convection heating system tend to big, heavy the reaching owing to lacking effective energy of workload makes operating cost too high.

The metal can closure is any heater that is transported to two kinds of methods usually.These closures can transport with a conveyor belt, and in the case, closure is flat to crouch on belt, has on the side direction of coating, maybe can be stacked in a track or the cage, becomes contact face-to-face mutually.In the latter's situation, each closure ties up on the direction that becomes traversed by with its surface and is pushed through this device.The latter's device is disclosed in No. the 4th, 333,246, the United States Patent (USP) awarding to Sullivan.

In two kinds of orientations, the transporting velocity of drying device and length system through select with guarantee each can closure when this device occurs in the coating existing sufficient water content be discharged from.If but production line is because of certain reason or get clogged somehow and stop, then problem can take place, in this case, the comparable original stop that longer time is arranged of the metal can closure in heater, thereby make its superheated and may damage.The mechanism of no closed-loop path provides and has been used for handling this kind situation.But,, also will be difficult to enough promptly stop heating process to avoid infringement even be provided with this kind mechanism for infrared system and high temperature contracurrent system.Really the convection heating system of existing lower temperature can be avoided the danger of superheated cover, must be enough to cause damage because of it is never hot, but these lower temperatures also makes us needing long drying time and long transport path satisfactorily.

Many heaters that are used for the metal can lid closure exist another problem that produces because of the speed of transfer pot closure by heater in the prior art.The metal can lid closure is constantly to produce under the two-forty of 1,600 of about per minute, and this requirement is passed through heater with the speed of two-forty.Especially conveyor belt is transported system, when moving with this speed, the metal cover very easily flies away from belt.For avoiding this situation to take place, the heater of prior art generally includes vacuum equipped or permanent magnet is tightly inhaled closure on belt.This kind vacuum equipped may expend very big and bulky.

Known method with some kinds of metal objects of high-frequency induction heating.For example be presented to people's such as Nuns United States Patent (USP) the, 4,673, No. 781, this patent applies AC magnetic field to hardware, thereby induce eddy current in hardware by twine the coil that is connected with alternating current on magnetic core, reaches the purpose of heating.And for example, be presented to people's such as Curtin No. the 4th, 582,972, United States Patent (USP), this patent is arranged a plurality of magnetic core coils along the workpiece stroke, and utilizes the chain type mobile device to make workpiece pass through the alternating magnetic field that is produced by magnetic core coil, realizes the induction heating to bonding jumper.But, be not applied to the manufacturing of metal can closure so far as yet.Consult No. the 4th, 339,645, United States Patent (USP) for example awarding to Mi Le (Miller), award to No. the 4th, 481,397, the United States Patent (USP) of Ma Ruiersi (Maurice); Award to No. the 4th, 296,294, uncle gram thing (Beckert) United States Patent (USP) and award to No. the 4th, 849,598, the United States Patent (USP) of Nuo Jiake (Nozaki).Though the some systems that disclosed in these documents can be used for heating of metal jar closure, be not best method.Particularly for example these systems may be very big and heavy, needs water cooling, reaches the poor efficiency owing to the unnecessary consumption of magnetic flux.Each coil of the induction heating equipment of prior art is also moulding very carefully usually, shifts to guarantee suitable energy.

Purpose of the present invention is providing the metal can closure firing equipment that can overcome above-mentioned some or whole shortcomings.

One object of the present invention is, a kind of metal can closure heater is provided, and this device can more effectively carry out induction heating to the metal can closure, reduces the loss of magnetic flux.

Another object of the present invention is, a kind of metal can closure heater is provided, and this device utilizes a magnetic field that the metal can closure is separated in transmission path effectively.

To achieve these goals, the invention provides a kind of electromagnetic induction heating device, it comprises: a plurality of covers, cover are face-to-face mutually, and have applied compound-material on the cover; One nonconducting supporter, supporter is configured to, and when when supporter transmits cover with aspectant relation, is used to support cover; One AC power; One electric conductor, electric conductor links to each other with AC power, and fully near supporter, so that in supporter, produce AC magnetic field; An and transmitting device, transmitting device transmits cover along supporter with aspectant relation, and make cover pass through AC magnetic field, thereby in cover, induce electric current, to the cover induction heating, and thus to being applied to the compound-material heating on the cover, wherein transmitting device transmits cover along holder with the face-to-face way of contact.

The present invention also provides a kind of electromagnetic induction heating device, and it comprises: a plurality of covers, cover are face-to-face mutually, and have applied compound-material on the cover; One nonconducting supporter, supporter is configured to, and when when supporter transmits cover with aspectant relation, is used to support cover; One AC power; One electric conductor, electric conductor links to each other with AC power, and fully near supporter, so that in supporter, produce AC magnetic field; One transmitting device, transmitting device transmits cover along supporter with aspectant relation, and makes cover pass through AC magnetic field, thereby induces electric current in cover, to the cover induction heating, and thus to being applied to the compound-material heating on the cover; With a magnet, magnet is used for producing a magnetic field in supporter, makes cover separate shared magnetic field effectively.

The present invention uses nonconducting supporting construction to provide path by magnetic field for the metal cover of face-to-face contact, and because supporting construction itself is non-conductive, so magnetic field is not influenced, has reduced the loss of magnetic flux.Supporting construction and electric conductor are fully approaching, can produce induction heating magnetic field in the stroke that the metal cover passes through, and cover is effectively heated.Especially, when supporting construction adopts circular pipe, because of its cross sectional shape is identical with the metal cover, so help transmitting cover.In addition, circular pipe has improved the efficient of induction heating for winding around provides a desirable surface.

The present invention also utilizes permanent magnet to produce magnetic field in supporting construction, and the cover of the face-to-face relation of one-tenth that transmits is therein effectively separated.

The present invention is special with it, specific embodiment is illustrated, and with reference to each accompanying drawing, in the accompanying drawings,

Fig. 1 is the side view of apparatus of the present invention.

Fig. 2 is the figure of the plurality of magnetic line of force that produced in key diagram 1 shown device.

Fig. 3 is the top view of a metal can sealing among magnetic core shown in Fig. 1 and Fig. 1.

Fig. 4 is the front elevation of another specific embodiment of the present invention.

Fig. 5 is the top view of device shown in Figure 4 along straight line 5-5 intercepting.

Fig. 6 and 7 is respectively the side view and a cross section of another specific embodiment of the present invention.

Fig. 8 and 9 has illustrated promotion technology of the present invention.

Figure 10 and 11 is the side view according to device of the present invention, is used for representing its each characteristic.

Figure 12 is the top view of the part of apparatus of the present invention, can unite use with for example conveyor belt shown in Fig. 1.

Fig. 1 represents induction drying device of the present invention.This device comprises a series of E shape magnetic cores 10,12 and 14 that are arranged in different lengthwise positions along the length of a transport path 16.Each magnetic core has the parallel fork thigh 22 and 24 in central authorities parallel fork burst 20 and two outsides.Each magnetic core system because of following reason with separately gap 26 and 28 at longitudinal subdivision.Each fork stock index of the parallel fork thigh 20,22,24 of each E shape magnetic core is to transport path 16.

One conveyor belt 40 places the top of each magnetic core 10,12 and 14, and by by the motor of symbol 42 expressions and the rotation of roller, constantly moves forward on the longitudinal direction of landline 16.Thing 50 flat crouching on conveyor belt 40 are closed in a series of metal potting, and owing to the motion of conveyor belt 40 moves forward along transport path.As shown in the figure, each metal can closure 50 rests on its crimping 52 that stretches downwards from the main surface of closure.Before placing on the conveyor belt 40, will be placed in these crimpings by dry coating connection pearl (not shown).

Each E shape magnetic core 10,12 or 14 central authorities fork stock do not use the coil 60,62 or 64 that is made of lead 66 to twine.The opposite end of lead 66 is connected to an AC power 68.Coil 62 is to twine from the rightabout of coil 60, and coil 64 is that rightabout from coil 62 twines.The reason of using different coil windings directions is obviously as can be known.

Fig. 2 has shown the phase place at alternating current source 68, and coil 60,62 and 64 is together with magnetic core 10,12 and 14 magnetic flux paths that produced.When this AC power 68 during at its positive half cycle, in coil 60, produce an induced field, its arctic is at central authorities' fork strand free end of magnetic core 10, and the South Pole is in this coil end opposite (bottom).But, magnetic core 10,12 and 14 all is high magnetic conductivity, therefore has such magnetic line of force, and they send from the bottom of coil 60, walk to then the parallel fork in magnetic core 10 liang of outsides strands 22 and 24 near.

Can produce two flux circuits thus.One loop from the arctic 20 extend and stride across air-gap to the South Pole 22 and the substrate of wounded core 10 be back to the arctic 20 again.Another 20 extends across another space of E shape magnetic core and the South Pole 24 that arrives from the arctic, returns the arctic 20 with the substrate of opposite direction wounded core 10.Because the shape of magnetic core 10,20 magnetic lines of force of crossing over space to the South Pole 24 generally are curved line from the arctic.Because the orientation and the position of magnetic core 10, these curved lines pass transport path 16 again, and finally metal can closure 50 by the time pass each closure.Therefore, we can say, the shape of magnetic core 10, orientation and position have been concentrated the magnetic line of force in the magnetic field that is produced from coil 60 in itself, make it pass through landline 16.Characteristics of the present invention have been improved the energy coupling efficiency that enters metal can closure 50 from AC power 68 greatly, and aspect the winding of coil 60 or shaping without any special accuracy requirement.

Because the above-mentioned axial clearance 26 and 28 between the

magnetic core

10 and 12 and 12 and 14 can obtain extra efficient.As previously mentioned, the winding direction of coil 62 on fork thigh in centre among the E shape magnetic core 12 is opposite with the winding direction of magnetic core 10 and 14.Therefore, when the outside of E shape magnetic core 10 fork thigh 22 and 24 was magnetic south, 22 and 24 on E shape magnetic core 12 outsides fork thigh was the arctic.Magnetic core 12 and 14 s' relation also is like this.Therefore the magnetic flux path that is produced except between the fork thigh of each independent magnetic core, every pair also produces an arc magnetic flux path in addition between the most adjacent outside fork thigh of magnetic core.

AC power 68 is vibrated about 20 KHz, thereby makes magnetic field that coil and magnetic core produce also with identical hunting of frequency.When metal can closure 50 when transport path 16 moves, also produce alternating current in it with same hunting of frequency.20 KHz are to select as best fundamental frequency for the appropriate heating that obtains the metal can closure.Because skin effect, to know as everybody, lower frequency will be responded to the induced current that gos deep into the metal can closure, and the electric current that upper frequency is inducted is then more shallow.Best AC power 68 is enough flexibly and can be in the frequency of thousands of hertz of each direction changes, so that size, shape, material content, and the energy exchange efficient of the best is arranged about magnetic core 10, the 12 various metal can closures 50 all different with 14 position.

Fig. 3 shows the top view of an E shape magnetic core and the metal can closure 50 that one is selected for use.As seen from the figure, the width of magnetic core 10 with the direction of transport path 16 traversed bies on wideer than the diameter of metal can closure 50.In general, for guaranteeing that all parts of metal can sealing 50 are heated, magnetic core 10 maximum expected width with workpiece at least is identical.

As previously mentioned, magnetic core 10,12 and 14 should be made by the material of high permeability, does maximum comprising with the magnetic line of force that coil 60,62 and 64 is produced.Each magnetic core also should have low electric conductivity, with the energy loss that prevents that magnetic core internal cause induction by current from being produced.Ferrite is the suitable material that reaches these purposes.Similarly, conveyor belt 40 should be made by non-conductive material.

As seen, can do various variations to the specific embodiment shown in Fig. 1,2 and 3.For example, connect though three coils 60,62 and 64 are shown as with same AC power 68, the also available power supply that separates is all powered to a certain coil or coil.As another example, each magnetic core can have different orientations, but still makes flux concentrating pass through transport path 16.Another example though each magnetic core shown in Fig. 1 only has around the winding of the parallel fork of central authorities strands 20, obviously can increase winding in the other direction in addition, place the parallel fork in the outside strands 22 and 24 around.Each winding also can place each magnetic core base portion around.Other shape or magnetic core also belong to feasible.For example a U-shaped magnetic core also can be worked, as long as the position of this magnetic core and orientation can make the magnetic line of force concentrate by transport path 16.

The modularize of the structure of the induction heating equipment shown in Fig. 1-3 provides adaptability widely to the configuration of each magnetic core.For example, only depend on to add or remove magnetic core, can easily increase or reduce the length of the transport path that heating of metal jar and closure passed through.For example, because the variation of water content in the rapid change of production line or the coating to be dried may produce this needs.As another example, in many cases, when workpiece entered heater assembly, may wish increased its temperature more slowly, and when the workpiece advanced downstream, then wished to increase sharply temperature.This can be realized by following straightforward procedure: promptly, make the upstream magnetic core far away from transport path, and make a fairly large number of downstream magnetic core nearer from transport path.

Obviously, the present invention is not limited to the metal can closure, also can share with other device, and best (but not necessarily) uses smooth conductivity workpiece.Many other change also clearly.

Figure 12 is the top graph of the different embodiment of device of the present invention, has wherein omitted magnetic core 10,12 and 14.This device comprises a support 350, on this support, in the face of and along transport path 16 a plurality of spirality windings of configuration continuously.The conveyor belt 40 (Fig. 1) that is loaded with metal cover 50 is not shown among Figure 12.Each winding 352 is interconnected in heterogeneous mode, and particularly every tertiary winding all links together.The three-phase of AC power 68 (Figure 12 does not show) is connected to three phase place A, B and the C of winding respectively.As the embodiment of Fig. 1, the embodiment of Figure 12 moves metal can closure 50 along transport path, produce higher-order of oscillation eddy current therein.Use the leggy winding to be suitable for providing as shown in figure 12 hereinafter with the motive force that is explained in more detail.If promote to be by certain other device for example a conveyor belt that moves provide, then only need a single phase configuration.

As previously mentioned, the problem of the metal can closure drying device of prior art is when production line gets clogged for a certain reason or stops, and this device has superheated so that damage the tendency of the metal can closure in the heater.Even be provided with the device of closing heater when production line stops, heating still can continue the long time.

According to an aspect of the present invention, be provided with the temperature controller of closed-loop path for metal cover 50.Especially as shown in Figure 1, a temperature sensor 80 (using infrared ray (IR) transducer usually) can be set near transport path 16, to detect the temperature of closure 50.If temperature is higher than in a predetermined temperature, AC power 68 is promptly closed automatically.Can stop all electric currents of metal can closure of flowing through like this, thereby prevent immediately that almost closure is overheated.

Do not resemble the fault that production line stops even not existing, temperature detection also can be used as the part of the closed-loop path temperature controller of Induction heater normal running, for example, we know, place a kind of special water base sealant in the crimping 52 when closure 50 reaches temperature 150-220F, fully heating reaches 98% solid in 10 minutes.Therefore, the system for detecting temperature of closed-loop path can be included in an induction drier, this system detects the temperature of metal can closure individually, and closes AC power 68 when the limit temperature is faced in each closure arrival.Use this method, can adapt to different size, thickness, the closure of position or orientation even be in the Continuous Flow of closure, does not need to change the structure of induction drying nest in the production line yet.

Holding device

The conveyor belt 40 of Fig. 1 moves very fast usually, so that the metal can closure of per minute drying about 1,600.Under this speed, often make each closure skid off conveyor belt 40, unless hold it on the original position with certain holding device.And also should comprise a kind of holding device, in order to offset in each winding the magnetic repulsion between induced current in the electric current and metal can closure.

As previously mentioned, the metal can closure normally is made from aluminum or steel.For aluminum metal can closure, holding device can be made into air-breathing device of each perforation of a kind of belt 40 from conveyer downwards.But, this kind vacuum plant may be expensive and bulky, if may, preferably avoid using.Therefore, for the jar closure of steel (or other ferromagnetic substances) system, with magnetic core 10,12 and 14 and coil 60,62 and 64 this holding device is provided itself.That is to say,, make and also each closure is inhaled to conveyor belt 40 by magnetic force except that closure 50 internal induction suitable current to each magnetic core location and orientation.The repulsion that magnetic core 10,12 and 14 location and orientation should make this magnetic attraction produce greater than the power supply of inducting.

Available embodiment:

Shown in Fig. 4 and Fig. 5 is the available embodiment of induction type drying device manufactured according to the present invention, and wherein the metal can closure is stacked face-to-face, and with the direction of the main surperficial traversed by of each closure on pushed and pass through heater.

Fig. 4 represents the front elevation of this device, and Fig. 5 represents along the perspective view of Fig. 4 straight line 5-5 intercepting.For making diagram clear, Fig. 5 has omitted one group of magnetic core, i.e. magnetic core 120 and direct each magnetic core in its back.In this device, each the metal can closure 100 in piling up is placed on pair of

guide rods

102 and 104 in upright mode.Other is provided with two

guide rods

106 and 108 and in order to assistance each closure is remained on its position.These four guide rods 102,104,106 and the 108 common transport paths 110 that limit stacked closure 100.Though each closure 100 is shown as mutual separation in Fig. 5, this is only convenient for showing, otherwise can't watch each part of this device.In fact, each metal cover system props up (contact) mutually, and as its shape permission, each cover is nested with mutually.Use this mode, the whole cover that piles up can only be used from this power of piling up the rear end and advance along transport path 110.

In three different radial positions a plurality of E shape magnetic cores 120,122 and 124 are arranged around transport path 110.Each magnetic core 120,122 and each magnetic core of 124 have coil 126,128 and 130 separately, twine in the central on the fork strand in the described mode of relevant Fig. 1 device.These three magnetic cores 120,122 and 124 are fixed (not shown) on the framework, and described framework is also on guide rod 102,104,106 and 108.Adopting said method, these three magnetic cores 120,122 and 124 form a relevant interior module (only AC power exception) of machine, and can place along any lengthwise position of the length of transport path 110.These modules also can join in the induction heater or from this heater and remove as required according to the variation needs of any specific production line.Comprise that in each module the AC power of opening in a minute can obtain other modularize.

As shown in Figure 5, the special induction drying device of this kind comprises three modules, and they are arranged on three continuous lengthwise positions along the length direction of transport path 110.Particularly, this module that is right after visible module back in Fig. 4 comprises by

respective coil

136 and 138

magnetic cores

132 and 134 that twine.For making example clear, Fig. 5 has omitted radial position three magnetic core identical with magnetic core 120 (Fig. 4).Similarly, comprise that the 3rd module of magnetic core 142 and 144 (being wound with coil 146 and 148 respectively) longitudinally is positioned at the back of

magnetic core

132 and 134 along transport path 110.Equally, Fig. 5 has omitted radial position three magnetic core identical with magnetic core 120 (Fig. 4).

Coil is wrapped in along on central authorities' fork thigh of the continuous magnetic core of E shape of the longitudinal axis layout of transport path 110, and winding direction is opposite, and each magnetic core is separated from each other with the reason identical with above-mentioned Fig. 2.In addition, guide rod 102,104,106 and 108 is made by for example electrically non-conductive material such as plastic cement or pottery.

During operation, the metal can closure is handled with selective coating, and shifts above-mentioned rear end of piling up onto with magnet-wheel or other devices (not shown) usually.With each new metal can closure heap deliver to pile up the rear end action effectively with the whole width that pushes a metal can closure forward that piles up.Gan Zao each closure is then removed from the front end that this piles up with identical speed.

When AC magnetic field that each closure produces by each magnetic core shown in Fig. 4 and 5 and coil, produce high-frequency ac current in each closure, thereby with as above-mentionedly heat each closure about the similar identical mode of installing among Fig. 1.Fig. 4 and 5 also represents another characteristics, and promptly each magnetic core can form and the workpiece similar shapes at the end of fork thigh, is maximum so that make the magnetic flux by cover.These characteristics are respectively by the fork thigh end 150,152 of E shape magnetic core 120,122 and 124 and 154 arc the expression.

The same with the device among Fig. 1, the device in Fig. 4 and 5 comprises AC power 168, so that pass through the hunting of frequency of the electric current of each winding with about 6-20 KHz.The closed-loop path temperature controller can be included in the infrared temperature detector 180 in addition, and if be scheduled to threshold value when above when the temperature of each lid increases to one, then close this AC power.The consideration item of installing among above-mentioned relevant Fig. 1 and the remainder of variation also are applicable to the device of Fig. 4 and 5.

Another embodiment

When metal cover or other are essentially that the en plaque object moves and during by a drying or solidification equipment, wish to make it separated from each other, with allow air enter workpiece all each partly.The United States Patent (USP) of above-mentioned Sullivan has been narrated a technology that a series of workpiece that will just advance along a track with face-to-face relation are separated for the 4th, 333, No. 246 on traversed by workpiece first type surface direction.In this patent case, workpiece is pushed over the curved path that track limited by a constant width, is pivoted on than near the part of the workpiece the short radius with permission, thereby partly taking place than near the workpiece the major radius fan-shaped separating.Sullivan uses this track, when heated air is pointed to each part of separating, each cover is partly separated.

Above-mentioned Sullivan technology has some major defects.The first, though the some of each workpiece is separated with other workpiece, near another that workpiece always arranged partly (than short radius partly) contacts other workpiece.These workpiece only become fan-shaped scattering, but not real the separation.Therefore, for example, if solidify the coating that is applied on the cover selectively with this device, this device only can be used for optionally having applied coating, but the place that coating applies is not near the periphery that each lid may contact with each other.In addition, advance power of each lid to produce pressure on the part that each lid contacts with each other along track, this pressure can soften and/or damage metal or its coating that respectively covers.Again, this kind Sullivan device only can produce limited separation between the scallop of each metal cover is divided, because in the bigger separation requirement track tighter curve is arranged, then the device that each lid need be advanced along this track has bigger strength and stronger material.Because identical reason, this technology can not be used in long transport path, even each curve remains when very shallow also like this.Moreover it is good that the Sullivan technology can not cover work at the metal can with draw ring, because these covers are not done good being nested with, and if each cover contact, then scratch mutually.

As everyone knows, a plurality of magnets that move in a magnetic field will launch with the shared whole available magnetic fields of equalization.But, this technology is not used in the device of heating of metal beverage can cover so far as yet, because in the past, may need with the expensive magnetic material with very high Curie temperature.

Fig. 6 has shown the end view (part is cut) that keeps the induction type heater of steel (or other ferromagnetism) beverage can lid 100 separation with permanent magnet.Fig. 7 has then shown the cross section of same device.These metal covers place on pair of

guide rods

202 and 204 with terminal phase previous mode, and two

guide rods

206 and 208 are arranged in addition in order to assist keeping each closure on its original position.These four guide rods 202,204,206 and 208 limit the transport path that this piles up closure 100 together.Guide rod 202,204,206 and 208 be axially located along within the conduit 220 surface different peripheral positions on.For example pottery or polytetrafluoroethylene are made by electrically non-conductive material for guide rod and conduit.Preferably this conduit 220 is gone back thermal insulation, and its reason can be from hereinafter learning.In certain embodiments, can omit guide rod 202,204,206 and 208, its function itself is replaced by conduit 220.

Be installed on conduit 220 outer surfaces for inductive distribution 222, this distribution is connected with as shown in Figure 1 AC power 68.Above-mentioned distribution comprises the parallel zone of four helixes 223, and each is regional facing to the arc that is slightly less than 1/4th on conduit 220 peripheries, and extends (wishing to heat) along the total length of this pipe in this pipe in fact.The TURP that available various known technology satisfies in the power supply changes demand, and allows distribution to have than high current-carrying capacity.As needs modularize or other purposes, also distribution 222 can be set to the distribution group of a series of axial adjacency.

It should be noted that to be used to replace helix 223, above-mentioned distribution 222 can be made the single multiturn coil (not shown) that twines conduit 220.But, the magnetic force that this layout is inducted is tending towards each metal cover is rotated around a diameter, and makes it be difficult to keep the direction traversed by of its positive planar orientation and transport path.And this device has as described below, undesirable trend to the heating of permanent magnet separator.

This pipe 220 has hole such as 224 along the diverse location of its total length, so that metal cover internal ventilation.Air can be via these hole circulations to remove moisture, cooling or other processing.These holes 224 are avoided in the winding of helix 223.It is inboard in the alternating current impression magnetic field of this point to have influenced this pipe like this, but all heating process is not subjected to significant impact.Because above-mentioned distribution in fact still extends along the overall length that this manages sensed heating.

Be positioned at helix 223 four regional gaps and along the length of this pipe 220 machine-direction oriented be many rail bar magnets 230.For illustration is clear, only provide in the many rail bar magnets 230 among Fig. 6.The orientation of permanent magnet 230 is managed 220 peripheries along this magnetic north pole and South Pole alternately is provided.Show four permanent magnets 230 among Fig. 7, but can use any number greater than 1.And permanent magnet 230 can maybe can be set as axial adjacent segments respectively along the length of this pipe, modularize to be provided or to supply other purposes.

Fig. 6 and 7 device also comprise a vibrator 240 (only shown in Figure 6), mechanically make permanent magnet 230 axial vibrations.

In the operation, when the metal cover 100 of a given number during at this pipe inboard, these covers are attempted equal five equilibrium and are used the magnetic field that is produced along each permanent magnet 230 of this length of tube.Friction is overcome by mechanical vibrator 240, and vibrator makes magnet 230 vibrations, and makes the magnetic field axial vibration of its generation thus.Vibration frequency can be about 60 hertz, and its wavelength also respectively covers interbody spacer and will lack.Vibrate available additive method and obtain, guide rod 202,204 for example is installed, 206 and 208 on bend, makes it do axial vibration, or original magnetic force vibration in the counter magnetic field of use coil 222.Another kind method is to twine a coil (not shown) around this pipe 220, to provide especially in order to vibrate the slower oscillating magnetic field of metal cover 100.If vibration and transmission direction traversed by also belong to effectively.

The metal cover is placed the inboard of this pipe 220, and with the magnetic field that permanent magnet 230 is produced cover is separated, a high frequency AC magnetic field is supplied to distribution 222.Thereby in each metal cover of this pipe inboard, produce a high frequency AC magnetic field.This magnetic field produces eddy current, with to the heating of metal cover and make its drying.

People know that though high temperature induces in cover 100 inside own, it is chilly that distribution 222 still keeps.Needn't carry out water-cooled to the less induction coil of the number of turn.Again because high temperature only limits to crown cap 100 itself usually, and because permanent magnet 230 in fact in the outside, magnetic field that helix 223 is produced, the expensive magnet that permanent magnet can replace the high-curie temperature material to make with the ceramagnet of cheapness.Shown permanent magnet though should also be noted that Fig. 6 and 7, also available interchange or direct current magnet replace, to realize at interval.

Only otherwise apply other strength, the metal covers 100 in this pipe 220 will separate, with the magnetic field of shared permanent magnet 230 generations.Also can provide a motive force or thrust unit, so that each lid moves along transmission path 210 in the vertical.A method that applies this kind strength is that this pipe that tilts is so that its entrance point is higher than the port of export.The method application of weight is so that the distribution of each cover is crooked along the length of this pipe.So cover its interval when the port of export moves is more approaching.Arrive maximumly when tightening density in the exit when respectively covering, the magnetic field that permanent magnet 230 produced is no longer strong must to be enough to overcome the most approaching outlet of lid and to fall gravity trend when from this pipe.Therefore, for the metal cover that specifies number in desiring to be placed on pipe and for the appointment magnetic field that magnet produced at interval, can determine a crown cap added this tube inlet and another lid falls the inclination angle that from this pipe.Therefore can keep by the continuous flow of induction drier cover.

Each covers 100 also available additive methods it is promoted by pipe 220, mechanically a lid is removed from the outlet of this pipe when for example adding new a lid at every turn.For example, Fig. 8 has shown a upstream conveyor belt 250, and it is delivered to accumulation device 252 on the magnetic force with each cover 100, and this accumulation device regularly joins a new cover 100 import of this pipe 220.Each when adding this new cover, accumulation device 254 promptly removes this cover in the exit of this pipe 220 under the magnetic force, and is placed on the downstream conveyor belt 256, so that further processing.Each cover that adds is to import and when outlet removes another cover, and each cover of all the other in this pipe is then adjusted its lengthwise position automatically, the magnetic field that is produced with the shared permanent magnet 230 of equalization (demonstration among Fig. 8).Also can use a rotating knife (not shown) to replace accumulation device 254 down, remove independent cover to manage 220 ports of export from this.

The other method that pushes the metal covers along transport path 210 in this pipe 220 is, makes each cover move some as a linear pattern induction motor.If helix 223 is for example three to be connected, and provide the AC power 68 of three-phase, suppose that then each spiral linear system suitably separates, then one in each cover 100 specifies lid will be repeated to be attracted to next trip helix, and repelled by last helix when the phase place rotation of current source 68.Helix 223 can connect with the displacement of any required number of turn.

Another way is for providing a thrust unit, and this method increases the heterogeneous propelling coil of separation of this pipe 220 of winding, in order to promote cover 100 along the transport paths in this pipe 220.Show a three-phase (A, B, C) propelling coil 260 among Fig. 9.This propelling coil 260 can be in lower frequency (for example 60 a hertz) operation down.The propelling coil that separates has following shortcoming, and promptly it need add distribution, but advantageously heats and independence that the function that promotes can keep responding to.Therefore the propelling coil of available separation (for example 260) makes each cover keep moving, even makes it pass through not wish to take place a part of conduit 220 of induction heating.This feature is particularly useful when repairing the coating drier, for example the metal cover can be moved past the induction heating part of this pipe, then by the hot-air soaking part of this pipe, then passes through the cooling segment of same pipe.In this kind system, the some that available propelling coil 260 twines these pipes, and only partly be provided with induction distribution 222 at the induction heating of this pipe.

Propelling coil should not use the same some at this pipe 220 that induction heating will take place, because unwanted electric current may be brought out in the magnetic field that the irritability distribution is produced in propelling coil, and vice versa.

If desired, can assist any above-mentioned promotion technology by on purpose disposing separator magnet 230.For example, in Figure 10, two permanent magnets 230 are shown as from managing 220 and turn to its port of export to tilt.This can reduce in the pipe of the port of export and separates magnetic field, thereby allows cover to have more closely at interval towards the port of export direction of this pipe.Control cover 100 can be used for any purpose on demand along this technology of managing the density of 220 length each points.For example, where face need be simplified the process that this pipe port of export removes cover if palpus is in office, and then this technology comes in handy.

The present invention handles in the design of equipping at the metal cover great elasticity.For example because permanent magnet 230 (Fig. 6 and 7) does not need to have high-curie temperature, these magnets can be made with a flexible material.Allow to use a swan-neck 220 as shown in Figure 11 like this.Pipe 300 in Figure 11 though mainly be level, has 90 ° bending in import department, vertically goes straight up to import in order to form one.The import of pipe 300 directly places the top of a conveyor belt 302, and conveyor belt is carried to its position with each cover 100.Each metal cover is by permanent magnet 304 (only showing two among Figure 11) one by one in the suction pipe 300, and follows the bending of this pipe.For example 222 (Fig. 6 and 7) of one induction distribution can be set on pipe 300, or only be located on its part as shown in Figure 11.This technology can effectively be got rid of the needs to accumulation device on.Then can get rid of the needs of accumulation device down in the similar bending in the exit of this pipe 300.

Aluminum cover and body are nonferromagnetic because of it, may do the separation of magnetic force with for example 230 interval magnet (Fig. 6 and 7).But, because aluminum cover and itself are conducted eddy current therein because of this wiring of managing on 220 outsides, 222 heating of responding to generation that still are subjected to connecting up of aluminum cover.Promotion characteristics of the present invention also are applicable to the aluminum workpiece, because the eddy current that brings out in workpiece produces a magnetic field, there is the repellency tendency in this magnetic field to 222 magnetic fields that produced of connecting up.Therefore workpiece forms a linearity motor that repels with wiring 222, along inboard this workpiece that vertically advances of this pipe 220.Moreover though with regard to the magnet workpiece, the magnetic attraction of 223 pairs of workpiece of helix may must break through the magnetic repulsion that is produced by force, and this is also untrue in aluminum metal cover.Therefore the aluminum workpiece will inwardly be repelled with substantial consistency from all sides of this pipe, forces its central authorities that enter this pipe, thereby makes friction reduce to irreducible minimum when workpiece vertically advances.To minimize to for example needs of vibrator 240 like this.The heterogeneous linear advancement motor that the workpiece of aluminum also can be formed by the polyphase windings (Fig. 9) of for example 260 expressions is advanced.

By certain embodiments the present invention has been described, and has had many variations in its scope.

Claims

1. electromagnetic induction heating device, it comprises:

One AC power;

One electric conductor, described electric conductor links to each other with described AC power, produces AC magnetic field;

It is characterized in that, also comprise:

A plurality of covers, described cover is face-to-face mutually, and has applied compound-material on the cover;

One nonconducting supporter, above support is configured to, and when when above support transmits described cover with aspectant relation, is used to support described cover, and described electric conductor is fully near above support, so that produce described AC magnetic field in above support; With

One transmitting device, described transmitting device transmits described cover along above support with aspectant relation, and make described cover by described AC magnetic field, thereby in described cover, induce electric current, to described cover induction heating, and thus to being applied to the described compound-material heating on the described cover, wherein

Described transmitting device transmits described cover along described holder with the face-to-face way of contact.

2. equipment as claimed in claim 1 is characterized in that, described transmitting device comprises that one is used for transmitting with aspectant relation along above support the means of described cover.

3. equipment as claimed in claim 2 is characterized in that described transmission means comprises a magnet-wheel, and described magnet-wheel promotes described cover along above support with aspectant relation.

4. electromagnetic induction heating device, it comprises:

One AC power;

It is characterized in that, also comprise:

One nonconducting supporter, above support is configured to, and when when above support transmits described cover with aspectant relation, is used to support described cover, and described electric conductor is fully near above support, so that produce AC magnetic field in above support;

One transmitting device, described transmitting device transmits described cover along above support with aspectant relation, and make described cover by described AC magnetic field, thereby in described cover, induce electric current, to described cover induction heating, and thus to being applied to the described compound-material heating on the described cover; With

One magnet, described magnet are used for producing a magnetic field in above support, make described cover separate shared described magnetic field effectively.