CN1080454A

CN1080454A - Induction dryer and magnetic separtor

Info

Publication number: CN1080454A
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: 1994-01-05
Anticipated expiration: 2007-05-11
Also published as: DE69132177D1; DE69128096T2; CN1047276C; DE69132177T2; EP0776146B1; EP0776146A2; JPH06510622A; EP0776146A3; ZA923420B; EP0583242B1; DE69128096D1; WO1992009397A1; EP0583242A4; EP0583242A1

Abstract

Be used for the device of induction heating metal cover, comprise each heart body of high permeability and low electric conductivity, these heart bodies have at least two utmost point portions that magnetic is opposite, all point to a transport path of each metal cover.High-freq AC current puts on the winding of these heart bodies, thereby the interchange heating current of inducting in the metal cover, and it is fully heated to drive off moisture.These heart bodies can be E shape, and can place along each lengthwise position of this transport path and/or around each radial position of this transport path and become module.The temperature controller that also can comprise the closed-loop path to prevent just in case production line meet accident stop the time each metal can closure overheated.

Description

Induction dryer and magnetic separtor

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.The coating of different shaped class 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 solid 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 can accept drying so that in 24 to 48 hours closure is put on a metal can well.

In the past, metal can closure system is usually heated at assistance drying or solidification process by infrared radiation or Convective Heating method.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, in the case, sealing is flat crouch on the belt with a cated side on, maybe can be stacked in a track or the cage, the contact that becomes contact face-to-face is in the latter's situation mutually, and 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 it is too heated and may damage.Provide in the mechanism of no closed-loop path and be used for managing this kind situation, but,, also will be difficult to enough stop rapidly heating process to avoid infringement even be provided with this kind mechanism for infrared system and high temperature contracurrent system.The convection heating system of existing really lower temperature can be avoided the danger of superheated cover, and because of not hot must being enough to thereafter causes damage, but these lower temperatures to need satisfactorily also to make us the lower drying time and the transport path of length.

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

Some kinds of metal objects are prior art with high-frequency induction heating, but are 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 and 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 heater that can overcome above-mentioned some or whole shortcomings.

According to the present invention, to put it briefly, the metal can closure is to place a higher-order of oscillation magnetic field to give induction heating, this magnetic field is to be produced by the induction coil of wire-wound at a high permeability and low electric conductivity heart body.The shape of heart body and orientation are to be made for to make the opposite the two poles of the earth of its magnetic in a concentrated manner from the route guidance magnetic flux of coil edge by the metal can closure.

The metal can closure can transport along the transport path by this magnetic field, and face-to-face relation that can straight or mutual one-tenth piles up on a belt conveyor and orientation.If if flat crouch on a conveyor belt and the metal can closure comprises ferromagnetic materials, then the vertical conveyer of each heart body below is concentrated magnetic flux line and entered this transport path, thereby divided by outside the induction mode heating, and keep closure on belt with magnetic force.Can need above-mentioned huge vacuum system like this.

Aspect another characteristics of the present invention, oversensitive physical efficiency is producing many oscillating magnetic fields along the different longitudinal position of transport path and/or near the different radial positions transport path.This magnetic field generation device is modularity rapidly, thereby is fit to the change needs of each specific production line easily.

In another characteristics of the present invention, be provided with the device that detects metal cover temperature and control again with closed-loop path temperature to the jar closure.If temperature surpasses a predetermined critical then closes this heater.

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 some magnetic flux lines of being produced in the key diagram 1 described device.

Fig. 3 is the top view together with each heart body of thing of metal can sealing among Fig. 1 shown in Fig. 1.

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

Fig. 5 is the top view of Fig. 4 center line 5-5.

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 is used for illustrating 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 centre of

form bodies

10,12 and 14 that place along the different lengthwise position of the length of a transport path 16.Each heart body has the

parallel jaw

22 and 24 in a central parallel jaw 20 and two outsides.Each heart system because of following reason with separately gap 26 and 28 at longitudinal subdivision.Each jaw of the

parallel jaw

20,22,24 of each E centre of form body is to point to transport path 16.

One conveyor belt 40 is the tops that place each

heart body

10,12 and 14, and be by symbol be 42 the expression motors and the rotation of roller, on the longitudinal direction of landline 16, constantly move forward.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 Figure 4, each metal can closure 50 is to rest on its crimping 52 that stretches downwards from the main surface of closure.Will dry coating bead (not shown) can before placing on the conveyor belt 40, be placed on these crimpings.

The one E centre of

form body

10,12 or 14 central jaw are to twine with lead 66 and coil 60,62 or 64.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 is presented at a phase coil 60,62 and 64 of alternating current source 68 together with

heart body

10,12 and 14 magnetic flux paths that produced.When this alternating current source 68 during at its positive half cycle, in coil 60, produce an induced field, its arctic in the central jaw free end of heart body 10 and the South Pole in this coil end opposite (bottom).But,

heart body

10,12 and 14 respectively is high magnetic conductivity, comprises the magnetic flux line that sends from coil 60 bottoms and they are carried near the two outsides

parallel jaw

22 and 24 of heart body 10 effects yet have.

Can produce two flux circuits by this.One loop from the arctic 20 extend and stride across air-gap to the South Pole 22 and the substrate that encircles rotating core body 10 be back to the arctic 20 again.Another 20 extends across another space of E centre of form body and the South Pole 24 that arrives from the arctic, returns the arctic 20 with the substrate that encircles rotating core body 10 in the other direction.Because the shape of

heart body

10,20 magnetic lines of force of crossing over space to the South Pole 24 generally are curved line from the arctic.Owing to the orientation and the position of heart body 10, these curved lines pass through transport path 16 again, and pass through each metal can closure 50 at last when it passes through.Therefore, we can say, the shape of heart body 10, orientation and position concentrate the magnetic line of force in the magnetic field that is produced from coil 60 by landline 16 in itself.Characteristics of the present invention have been improved greatly from AC power 68 and are entered the energy coupling efficiency of metal can closure 50 and do not require the winding of coil 60 or any special accuracy of shaping.

Because

heart body

10,12, and the above-mentioned axial clearance 26 and 28 between 12,14 can obtain extra efficient.As previously mentioned, coil 62 is to be wound on the central jaw of E centre of form body 12 with the direction opposite with the winding of heart body 10 and 14.Therefore, no matter when the outside of E centre of form body 10 divides

jaw

22 and 24 to be magnetic south, and so, E centre of form body 12 outside

jaws

22 and 24 are the arctic.This relation to

heart body

12 and 14 also belongs to truly, and therefore except the magnetic flux path that is produced by each independent heart body, an other arc magnetic flux path is to divide jaw to produce by every pair of outside in abutting connection with heart body.

AC power 68 is vibrated about 20 kilo hertzs of sesames, thereby makes magnetic field that coil and heart body produced also at identical hunting of frequency.When they also produce the alternating current of same hunting of frequency when transport path 16 moves in it at metal can closure 50.The number of 20 kilo hertzs of sesames is to select for the suitable degree of depth of metal can closure heating and as best fundamental frequency.Because the top layer 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 also to change the frequency of thousands of He Zhi flexibly in each direction, so that size can have the energy exchange efficient of the best with, shape, material content and with

heart body

10,12 and the 14 all different various metal can closures 50 in position that are as the criterion.

Fig. 3 shows the top view of an E centre of form body and the metal can closure 50 that one is selected for use.As seen the width of heart body 10 with the direction of transport path 16 traversed bies on be wide than the diameter of metal can closure 50.In general, for guaranteeing that all parts of metal can sealing 50 are heated, heart body 10 should be identical with greatest expected work package width at least.

As previously mentioned,

heart body

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 heart body also should have low electric conductivity, with the energy loss that prevents that the heart body internal cause induction by current from being produced.The ferrite magnet is the suitable material that reaches these purposes.Similarly, conveyor belt 40 should be made by non-conductive material.

As seen, Fig. 1, the various variations of the specific embodiment shown in 2,3 and 3 are possible.For example, connect though three coils 60,62 and 64 are shown as with same AC power 68, all available power supplys that separates of a certain or this coil replace power supply.As another example, though will flux concentrating pass through transport path 16, each heart body still can have different orientations.Another example, though each heart body shown in Fig. 1 only has the winding around central parallel jaw 20, increase in addition in the other direction winding can place outside

parallel jaw

22 and 24 around.Each winding also can place each heart body base portion around.Other shape or heart body also belong to feasible.For example a U-shaped heart body also can be worked, as long as this heart body is placed and be oriented to place with flux concentrating by transport path 16.

The modularize of expression induction heating equipment structure can provide elasticity widely to the configuration of each heart body among Fig. 1-3.For example, only depend on adding or remove heart body, can increase or reduce the length that metal can and closure heat the transport path of being produced easily.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 work package entered heater assembly, may wish increased its temperature more slowly, and when the work package advanced downstream, then wishing more promptly increases.This can by configuration upstream heart body (or each heart body) in the place of the big distance of distance transport path and more alms giver's body down realize in the place of distance transport path small distance.

Obviously as can be known, the present invention is not limited to the metal can closure, and also can share with other device, preferably not necessarily uses smooth conductivity work package.Many other change also clearly.

Figure 12 is the top graph of the different embodiment of device of the present invention, wherein omits

heart body

10,12 and 14.This device comprises a support 350, this above support to and follow transport path 16 continuously a plurality of spiral shells of configuration execute shape winding system.Be loaded with conveyor belt 40(Fig. 1 of metal cover 50) be not shown among Figure 12.Each helical spring 350 is interconnected in heterogeneous mode, and particularly each the 3rd spring all links together.AC power 68(Figure 12 does not show) three-phase system be connected to helical spring three phase place A, B and C.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.The use to the leggy helical spring as shown in figure 12 is to be suitable for providing 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 and damage or destroys the interior metal can closure tendency of heater.Close the device of heater even be provided with one at line stop time, it is one disgusting long-time that heating still can continue.

According to characteristics of the present invention, be the temperature control that metal cover 50 is provided with the closed-loop path.Particularly shown in Figure 1, can be arranged near the of transport path 16 for a temperature sensor 80 of infrared ray (IR) transducer commonly used 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.

Detect the part of the closed-loop path temperature controller that also can be used as the Induction heater normal running even without resembling invalid temperature that production line stops, for example, we are known to know, place the water base sealant of a kind of special water base sealing 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 a closed-loop path can be included an induction drier in, and 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, different size, thickness, position or directed closure, even can be accommodated in the structure that does not change production line induction drying nest in the Continuous Flow of each closure.

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 that a kind of holding device is 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, can be made into a kind of with air by air-breathing downwards holding device of each perforation in the belt 40 of conveyer.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, diligently

body

10,12 and 14 and coil 60,62 and 64 this holding device is provided itself.Still place and orientation except that each heart body closure 50 internal inductions produce suitable current, also each closure is inhaled to conveyor belt 40 with magnetic force.It is bigger than offsetting the power supply of inducting and producing required repulsion that

heart body

10,12 and 14 location and orientation should make this magnetic attraction.

Available embodiment:

Shown in Fig. 4 and Fig. 5 is the available embodiment of induction type drying device manufactured according to the present invention, wherein metal can sealing system face in the face of stacked 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 center line 5-5.One group of heart body be heart body 120 and directly each heart system of its back in Fig. 5, omit so that illustrate clear.In this device, each metal can closure 100 in piling up stops 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, whole folded cover can be only by advancing along transport path 110 from this folded rear end power.

In three different radial positions a plurality of E centre of form bodies 120,122 and 124 are arranged around transport path 110.Each heart body 120,122 and each heart body of 124 have coil 126,128 and 130 separately, twine in the central separately in the described mode of the device of relevant Fig. 1 on.These three heart bodies 120,122 and 124 be attached to not shown and end bay in guide rod 102,104, the framework on 106 and 108.Adopting said method, these three heart bodies 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 change needs of any specific production line.Other modularize can be obtained by the separately AC power that is included in each module.

As shown in Figure 5, the special induction drying device of this kind comprises along three modules at three continuous lengthwise position places of transport path 110.Particularly, this module that is right after visible module back among Fig. 4 comprises the

heart body

132 and 134 by

respective coil

136 and 138 windings.Place heart body 120(Fig. 4) a three-core body of same radial position being omitted of Fig. 5, so that example is clear.Similar ground comprises that the

heart body

142 and 144 that is wound with

respective coil

146 and 148 is in the back that vertically is positioned at

heart body

132 and 134 along transport path 110.Moreover, with heart body 120(Fig. 4) the three-core body that is arranged in same radial position omits at Fig. 5.

Winding divides each coil of jaw to twine in the opposite direction along the central authorities of the continuous heart body of each E shape of the longitudinal axis of transport path 110, and each heart body with on be set forth in the mutually same reason of Fig. 2 and separate mutually.In addition, guide rod 102,104,106 and 108 is to be made by the non-conductive material of for example 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.Each new metal can closure heap delivered to pile up the rear end be that action effectively pushes the whole width that reaches 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 heart body shown in Fig. 4 and 5 and coil, high-frequency ac current promptly results from each closure, thus 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 heart body can be similar to the work package shape in the end formation of minute jaw, so that make the magnetic flux by cover be maximum.These characteristics are respectively by the branch jaw end 150,152 of E centre of form body 120,122 and 124 and 154 arc the expression.

Because use the device among Fig. 1, an AC power 168 is to be included in the device of Fig. 4 and 5, so that pass through the hunting of frequency of the electric current of each winding with about 6-20 kilohertz sesame.The closed-loop path temperature controller can be included in the infrared temperature detector 180 in addition, and if increase to a predetermined threshold value when above when the temperature of each lid, 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, then wish to make its separated from each other with allow air enter work package all each partly.The technology that a series of activities part that will just advance along a track with face-to-face relation on the main surface direction of traversed by work package of the 4th, 333, No. 246 narrations of the United States Patent (USP) of above-mentioned Sullivan is separated.In this patent case, work package is pushed into by the curved path that track limited by a constant width, swings on than near the work package each several part the short radius scope with permission, thereby than near each part the major radius taking place fan-shaped separating.Above-mentioned patentee uses this track crime, 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 first work package separate with other work packages, another of work package commonly used partly (near each than short radius partly) contact other work package.These work packages only become fan-shaped scattering, but not real the separation.Therefore, if this device is used to solidify selectivity, and apply coating on cover, for example, this device only can selectivity be used for applying the place of coating, and near the periphery that can not may contact with each other for each lid.In addition, the pressure on the part that is contacted with each other really by each lid that power caused that advances each lid along track can soften and/or damages metal or its coating that respectively covers.Again, this kind Sullivan device only can become the limited separation of generation between fan-shaped part at each metal cover, because tighter curve in the crime of bigger separation requirement track, 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.

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

Fig. 6 shows that the use Permanent magnet carries out the end view (part is cut) of the device of induction type heating to keep steel (or other ferromagnetism things) system beverage can lid 100.Fig. 7 then shows the cross section of same device.These metal covers with end in opposite directions mode stay on pair of

guide rods

202 and 204, and two

guide rods

206 and 208 are arranged in addition in order to assist to keep each closure on its original position.These four guide rods 202,204,206 and 208 limit the transport path of this folded closure 100 together.Guide rod 202,204,206 and 208 tie up to along variant peripheral position on a conduit 220 inner surfaces and give axial location.For example pottery or polytetrafluoroethylene are made by non-conductive material in each guide rod and this conduit system.Best also this thermal insulation of this conduit 220, its reason can be known from reed hereinafter.Guide rod 202,204,206 and 208 can omit in some instantiations, and its function itself is replaced by conduit 220.

Be installed on conduit 220 outer surfaces for inductive distribution 222, this distribution system is connected with alternating current as shown in fig. 1 former 68.Above-mentioned distribution comprises the parallel zone that four spiral shells are executed line 223, and each regional subtend is slightly less than four minutes one arc and extends (enforcement in this pipe is desired by heating system) along the total length of this pipe in fact conduit 220 peripheries.Can use various known technology high current carrying energy to be arranged with electron exchange demand and the permission distribution that satisfies the power supply supply.If desire to have modularize or other purposes, also distribution 222 can be set to the distribution group of a series of axial adjacency.

Should notice that spiral shell executes the replacement of line 223, above-mentioned distribution 222 can be used as the single multiturn coil (not shown) that twines this pipe 220.But this device magnetic force of inducting is more than each metal cover is rotated around a diameter, and makes it be difficult to keep the direction traversed by orientation of its front at transport path.And this device the permanent separator magnetite of following described undesirable heating arranged super to.

This pipe 220 is along each hole that has on the variant position of its total length such as 224, with routine metal cover internal ventilation.Air can be via these hole circulations to remove moisture, cooling or other processing.Helix 223 twines in these holes 224.It is inboard in the alternating current impression magnetic field of this point to influence this pipe like this, but all heating process is not subjected to significant impact.Because in fact still extending, above-mentioned distribution is used for this pipe total length of induction heating.

Be positioned at four regional gaps of helix 223 and be many rail bar magnetites 230 along the length portrait orientation of this pipe 220.One that only provides many rail bar magnetites 230 among Fig. 6 in clear with illustration.The orientation of Permanent magnet 230 can be managed the magnetite arctic and the South Pole that 220 peripheries replace along this.Show four Permanent magnets 230 among Fig. 7, but can use any number more than 1.And permanet magnet 230 can maybe can be set as axial adjacent segments modularize to be provided or to supply other purposes respectively along the length of this pipe.

Fig. 6 and 7 device comprise that also a vibrator 240(is only shown in Figure 6), mechanically vibrate at axial permanet magnet 230.

In the operation, when the metal cover 100 of a given number is during at this pipe inboard, these covers are attempted equal five equilibrium and are used the magnetic field that is produced along each permanet magnet 230 of this length of tube.Friction is overcome by mechanical vibrator 240, this make magnetite 230 vibration and thus permanet magnet in the magnetic field that axially produces.Vibration frequency can be about 60 He Zhi, and wavelength also respectively covers interbody spacer and will lack.Vibrate available additive method and replace reaching such as guide rod 202,204,206 and 208 is installed and on bend, make it do axial vibration, or use original magnetic force vibration in the counter magnetic field of coil 222.Another can the person of selecting for use be along this pipe 220 twine coils (not shown) with provide especially in order to vibration metal cover 100 than slow oscillation magnetic field.If vibration and the direction traversed by that carries out also belong to effectively.

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

Though people know that high temperature ties up in of cover 100 itself and induce that it is chilly that distribution 222 still keeps.The water-cooled of the induction coil of few number of turn is also inessential.Again because high temperature only limits to crown cap 100 itself usually, and because permanet magnet 230 in fact in the outside, magnetic field that helix 223 is produced, the expensive magnetite that permanet magnet can replace the high-curie temperature material to make with the ceramic magnet of cheapness.Though should also be noted that permanet magnet is to be presented in Fig. 6 and 7, also available interchange or direct current magnetite replace to realize at interval.

Only otherwise apply other strength, the metal cover 100 in this pipe 220 will be separately with the magnetic field of shared permanet magnet 230 generations.Can provide a motive force or thrust unit so that each lid moves along route 210 in the vertical.A method that applies this kind strength is to tilt this pipe 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 pipe lid its interval when the port of export moves is more approaching.When respectively covering in the maximum deflation of exit arrival density, the no longer strong gravity trend that must be enough to overcome the most approaching outlet and fall the lid that from this pipe in the magnetic field that permanet magnet 230 produced.Therefore, with regard to the metal cover that specifies number in desiring to be placed on pipe immediately and with regard to the appointment magnetic field that magnetite produced at interval, an inclination angle can by no matter when a crown cap be added into the inlet of this pipe, another lid is then fallen and determine by 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 shows that a upstream conveyor belt 250 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 and is placed on the downstream conveyor belt 256 so that further processing under the magnetic force.Each cover that adds is to import and when outlet removes another cover, each cover of in this pipe all the other then adjust automatically its lengthwise position distribute among permanet magnet 230(Fig. 8 with equalization show) magnetic field that produced, accumulation device 254 removes independent cover to manage 220 ports of export from this also can to use a revolving force (not shown) to replace down.

Another method that pushes the metal covers along transport path 210 in this pipe 220 is to make each cover move some as a linear pattern induction motor.If helix 223 is for example three to be connected, and the alternating current of supply three-phase, can suppose that then each spiral linear system suitably separates, 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 the number of turn of any needs.

Another way is for providing a thrust unit, and this manages the heterogeneous propelling coil of 220 1 separation to its method in order to add a winding, to promote cover 100 along transport path in this pipe 220, a demonstration three-phase (A, B, C) propelling coil 260 among Fig. 9.This propelling coil 260 can for example be operated under 60 He Zhi in a lower frequency.One propelling coil that separates has following shortcoming.Be that it need add distribution in addition, but advantageously heat and independence that the function that promotes can keep responding to.Therefore each cover can for example 260 be kept moving by a propelling coil that separates, even in the some of this pipe 220 by not wishing induction heating.This feature is particularly useful when repairing the coating drier, for example the metal cover can be moved through the induction heating part of this pipe, then by the hot-air soaking part of this pipe, follows the part cooling of same pipe.In this kind system, the some of this pipe maybe can be wound with propelling coil 260, and only partly is provided with induction distribution 222 at the induction heating of this pipe.

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

The reliable separation device magnetite 230 autotelic configurations if desired time of any above-mentioned promotion technology are assisted.For example, in Figure 10, what two of each permanet magnet 230 were shown vertical 220 turns 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 turn to the port of export of this pipe, so that have more closely at interval.Control can be used for any purpose on demand along this technology of managing cover 100 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 can great elasticity.For example because permanet magnet 230(Fig. 6 and 7) do not need to have high-curie temperature, these magnetites can be made with a flexible material.For example allowing like this, the swan-neck 220 of person shown in Figure 11 uses.Though the pipe 300 in Figure 11 mainly is a level, there is 90 ° bending vertically to go straight up to import in import department to form one.The import system of pipe 300 directly places on the conveyor belt 302, and each cover 100 is carried to its position.Each metal cover system is by only showing two among permanet magnet 304(Figure 11) one by one in the suction pipe 300, and follow the bend of this pipe, for example 222(Fig. 6 and 7 of an 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 and promptly then can get rid of the needs of accumulation device once in the similar bending in the exit of this pipe 300 needs that rise mouthful.

Aluminum cover and body are nonferromagnetic because of it, may do the separation of magnetic force with for example 230 interval magnetite (Fig. 6 and 7).But, because aluminum cover and itself be because of this wiring of managing on 220 outsides guarantees to conduct therein eddy current, 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 work package, because the eddy current that brings out in work package produces the magnetic field that 222 magnetic fields that produced of connecting up is had the repellency tendency.Therefore work package forms a linearity motor that repels with wiring 222, along inboard this work package that vertically advances of this pipe 220.Moreover though with regard to magnet sex work spare, work package may must break through the magnetic repulsion that is produced by force to the magnetic attraction of helix 223, and this is also untrue in aluminum metal cover.Therefore the aluminum work package will inwardly be repelled with substantial consistency from all each sides of this pipe, forces its central authorities that enter this pipe, thereby makes friction reduce to irreducible minimum when work package vertically advances.Like this with one for example the needs of 240 vibrator minimize.The work package of aluminum also can for example be shown as 260 the heterogeneous linear advancement motor that group (Fig. 9) forms of scratching by a polyphase windings and be advanced.

The present invention is with the certain specific embodiments relevant with it explanation, and manyly can change in its scope.

Claims

1, a kind of device to conductive metal jar closure heating is characterized in that comprising:

Generation device is in order to produce the magnetic field by this object; And

Oscillation device in order to the intensity in this magnetic field that vibrates, thereby produces induced current in this conductive metal jar closure.

2, a kind of device to a series of conductivity object heating is characterized in that comprising:

The inductive distribution;

Bringing device in order to this electric induction distribution is applied an alternating current, and makes this distribution produce one first oscillating magnetic field; And

The magnetic force thrust unit is used for promoting above-mentioned object with magnetic force and passes through this first oscillating magnetic field along a transport path.

3, a kind of in order to handle the device of a plurality of ferromagnetic metal jar closures, it is characterized in that comprising

In order to handle the device of this closure; And

Magnetic device has at interval above-mentioned closure with magnetic means.