EP2866234A1 - Demagnetisation coil - Google Patents

Abstract

Degaussing coil (1) for demagnetizing ferromagnetic parts, comprising a coil carrier body (2) having a tubular central portion (3) with flanges (4) adjoining them on both sides, preferably in parallel planes, with one of the coil carrier body (2), a multi-wound insulated electrical conductor forming a coil winding (25) about its central portion (3) and a multi-part cap-like coil winding cover (6) extending over the coil winding (25) between the flanges (4). The coil carrier body (2) according to the invention is composed of at least two metal profile parts (8) with a U-shaped cross-sectional shape, which are annularly mechanically connected to one another at the front side and whose bases (9) are the middle section (3) and whose legs (10) are the flanges (4). form the coil carrier body (2), wherein between the end faces (11) of the metal profile parts (8) U-shaped connecting profiles (12) are arranged and the metal profile parts (8) at least at a connecting profile (12) are electrically insulated from each other. The connecting profiles (12) are in particular formed in several pieces and comprise a middle part (17) and two identically formed side parts (16), which can be coupled together.

Description

The invention relates to a degaussing coil for demagnetizing ferromagnetic parts, comprising a coil carrier body, which has a tubular central portion with flanges adjacent thereto on both sides, preferably lying in parallel planes, with an insulated electrical conductor carried by the coil carrier body and wound several times around its central axis forms a coil winding, and with a multi-part, lid-like coil winding cover which extends over the coil winding between the flanges.

Demagnetization of ferromagnetic parts is often required in the industry to facilitate handling or coating of the parts. In addition, demagnetization prevents magnetically attractable contaminants from being absorbed by the parts. The cause of the magnetization of, for example, workpieces are very diverse.

Demagnetization, also called demagnetization, is a process by which a ferromagnetic material that has become permanent magnetic loses all or part of its magnetic polarization. Such materials are usually demagnetized by a first strong alternating magnetic field, which then gradually subsides. Demagnetization coils, also called demagnetization tunnels, which generate an alternating magnetic field in the direction of their transmission axis, are frequently used in industry for the magnetic demagnetization of ferromagnetic parts. The demagnetizing coils are operated with an alternating current of typically about 50 Hz or less, wherein the parts to be demagnetized are slowly passed through the demagnetization coil at a uniform speed.

Known demagnetization coils, with the exception of small coils, have a coil carrier body of robust cast aluminum, which carries the coil winding. This is composed for example of different sized aluminum castings. The aluminum castings are part of a modular system and can be flexibly combined into coils of different sizes. The coil carrier body in this case comprises a tubular circular or angularly formed central portion with integrally formed flanges adjoining on both sides, which extend orthogonally to the central portion around which the insulated conductor forming the coil winding is wound several times. The coil winding is externally protected by a multi-part cover-like coil winding cover, which is screwed to the flanges, the coil winding completely covering.

In the above-mentioned prior art, the coil support body made of cast aluminum is complex to produce and therefore expensive. For each size and shape of the central portion and the flanges also different molds are required, which are only expensive to produce and require a long production time. This is disadvantageous especially for customer-specific custom-made demagnetization coils, since an adaptation to the respective size and / or shape of the ferromagnetic parts to be demagnetized is usually necessary.

On this basis, the invention has for its object to propose a way that allows a fast, flexible and cost-effective production of generic Demagnetisierungsspulen.

This object is achieved by a degaussing coil for demagnetization of ferromagnetic parts with the features of claim 1. Further advantageous embodiments can be found in the dependent claims.

Thereafter, the Entmagnetisierungsspule according to the invention has a coil support body, which is composed of at least two metal profile parts with a U-shaped cross-sectional shape. The metal profile parts are mechanically connected to each other at the end in a ring-shaped manner, their bases forming the middle section and their legs forming the flanges of the coil carrier body. According to the invention, U-shaped connecting profiles are arranged between the end faces of the metal profile parts, wherein the metal profile parts are electrically insulated from each other at least at a connecting profile. The U-shaped cross-sectional shape includes metal profile members where the spacing of the legs from the base of the steel profile member is constant or increases with increasing distance from the base. The U-shaped connection profiles are adapted to the respective cross-sectional shape of the metal profile parts to be joined.

The metal profile parts are simple and inexpensive to produce, for example, from correspondingly shaped steel profiles or aluminum profiles of any length by separation, so that demagnetization coils of any size can be manufactured with little effort and thus with low production costs. The U-shaped connection profiles are universally applicable, ie, regardless of the size of the demagnetization coil to be produced unchanged. For different cross-sectional shapes of the metal profile parts, in which the central portion forming bases and / or the flanges forming legs of the metal profile parts for different lengths and winding numbers of the coil winding must be designed differently, of course, various metal profiles are required. All provided for the production of the metal profile parts metal profiles are preferably formed without elevations and / or openings. The metal profile parts are thus inexpensive to produce, very easy to edit and can stocked due to the low unit cost and the universal use of metal profiles storage. Thus, special customer requirements in terms of the shape and size of the degaussing coil can be quickly implemented. Preferably, the metal profile parts are made of non-ferromagnetic steel material or aluminum material, preferably ferromagnetic stainless steel material, wherein the non-ferromagnetic steel material due to the lower eddy currents in the magnetic field of the coil winding heats up much less than aluminum or normal ferromagnetic steel.

The metal profile parts are positively or non-positively connected with each other and / or with the connection profiles in the assembled state. Preferably, these are bolted together or riveted. In this case, arranged between the end faces of the metal profile parts connecting profiles may in principle consist of any material, but not ferromagnetic material has proven to be particularly advantageous in terms of self-heating. They are adapted to the cross-sectional shape of the metal profile parts and in engagement with these or in engagement. Since only metal profile parts with identical U-shaped cross-sectional shape are used for a degaussing coil, only connecting profiles are used, which are of identical design. At least at one of the connecting profiles, the metal profile parts connected there are electrically insulated from one another by suitable measures in order to prevent ring currents in the coil carrier body. This can be achieved for example by insulating discs, sleeves, screws or rivets at the joints.

Preferably, the connection profiles are formed in several pieces and have a central part and two identically formed side parts, which can be coupled together. This facilitates the production of the U-shaped connecting profiles and also their installation between the end faces of the U-shaped metal profile parts essential.

In a preferred embodiment of the invention, the coil winding cover on the metal profile parts associated Spulenabdeckbleche. The Spulenabdeckbleche are preferably flat, preferably arranged without or with a small distance to the coil winding and each connected to the legs of the metal profile parts, which form the flanges. In practice, a greater distance may be present because the coil carrier body is usually only as fully wound as it dictates the field strength required for demagnetizing the parts to be demagnetized. The Spulenabdeckbleche are screwed, riveted, glued or otherwise attached to the coil support body, for example.

The tubular middle section of the coil carrier body can have any desired cross-sectional shape adapted to the parts to be demagnetized. Preferably, however, a cross-sectional shape is used in which the bases and the legs of the metal profile parts are planar and have rectilinearly extending edges, so that longitudinally non-curved metal profile parts can be used, for example, steel profile bars or aluminum profile bars with a corresponding U-shaped cross-sectional shape can be produced quickly and easily in all desired lengths. Preferably, the central portion of the coil support body is formed with a rectangular cross-sectional shape, which also includes square shape, so that the end faces of the legs of the metal profile parts extend at a 45 ° angle relative to the flat sides of the bases of the metal profile parts. Of course, the coil carrier body may also have instead of four corners and three, five or more corners, with only a straight number of corners seems reasonable. The angle of the end faces of the legs of the metal profile parts relative to the flat sides of the bases of the metal profile parts can be derived from the number of corners of the coil carrier body. In general, however, not all corners of the bobbin have an identical angle between the flat sides of the bases of the metal profile parts, but meaningfully opposite each other arranged corners.

In one embodiment of the degaussing coil according to the invention, the legs of the metal profile parts have integrally formed connecting webs which protrude laterally outwards from the legs and have through holes for a screw connection to one another and to the coil cover plates. In this case, the fastening of the U-shaped connection profiles on the end faces of the metal profile parts preferably takes place by clamping the middle part of the connection profiles and by screwing the two identically formed side parts of the connection profiles with the metal profile parts, wherein the screw preferably passes through the side parts.

The end faces of the legs of the metal profile parts extend expediently at a 45 ° angle to each other. Accordingly, the connecting webs of the metal profile parts on the one hand parallel to their bases and on the other to these inclined by 45 °. In this way, in each case the same executed metal profile parts can be used for the opposite sides of the bobbin. Accordingly, demagnetization coils according to the invention having a rectangular cross-sectional shape of the middle section only need two different lengths of the metal profile parts otherwise preferably formed identically in the mold. With square cross-sectional shape of the central portion thus four identically shaped metal profile parts of the same length are used.

In a favored embodiment of the degaussing coil according to the invention, the metal profile parts are bent sheet steel blanks, preferably made of stainless steel, or beveled aluminum sheet blanks. These can be cut from flat steel sheets or aluminum sheets with all conventional techniques in a flat form, provided with the necessary through holes and then bent accordingly to produce the desired cross-sectional shape. Thus, it is possible to dispense with the stocking of steel or aluminum profile bars, if desired, since the metal profile parts required for the production of a demagnetization coil can be obtained at any time directly from available steel sheets or aluminum sheets in the respective length and shape order related can be easily and quickly produced.

In a particularly preferred embodiment of the invention, the middle part of the connecting profiles on a connecting the bases of the metal profile parts rounded contact surface for the coil winding. This improves the electrical insulation between the insulated electrical conductor of the coil winding and the end faces of the metal profile parts, which form the coil carrier body. The train of the electrical conductor during the winding process is highest at the joints between the metal profile parts, so that here the insulation must be the best. The rounding of the connection profile at this point reliably prevents the connection profile from digging into, weakening or damaging the insulation of the electrical conductor forming the coil winding. In addition, it is achieved that the coil winding in the region of the connection profiles does not undergo too sharp bending, in particular that the electrical conductor is not bent, so that cracking is reliably prevented.

Preferably, the connection profiles are plastic parts which preferably have apertures for the screw connection assigned to the passage holes of the connecting webs. Thus, the connection profiles not only visually close the gap between the end faces of the metal profile parts, but simplify the local electrical insulation between them significantly.

In the case of electrically interconnected metal profile parts, the degaussing coil according to the invention preferably has metal bushes in the openings of the connection profiles and / or in the case of electrically insulated metal profile parts plastic bushings on the through holes of the connecting webs of the metal profile parts. In this way, too strong pressure influencing of the connection profiles is reliably prevented or an electrical insulation between the abutting metal profile parts is achieved.

The demagnetization coil according to the invention for the demagnetization of ferromagnetic parts has an electrical connection device for the coil winding and a power supply cable. This is preferably arranged on one of the Spulenabdeckbleche near one of the connecting profiles and overlaps the corresponding connection profile at least partially. Thus, the electrically insulated conductor forming the coil winding can be led out particularly easily at the end faces of the metal profile parts and introduced into the electrical connection device. An adaptation of the metal profile parts at the corresponding joint is not required. For this purpose, at least the connection profile assigned to the connection device in one embodiment of the invention has a passage for the insulated conductor of the coil winding.

In a particularly preferred embodiment of the demagnetization coil according to the invention, the metal profile parts and the Spulenabdeckbleche the coil carrier body are connected to each other only at the electrical connection device associated with the connection profile electrically non-conductive. At the other connection profiles there is an electrically conductive connection between the metal profile parts and the Spulenabdeckblechen. The electrically conductive connection is achieved at the respective points by inserted into the plastic connecting profiles metal bushings in conjunction with metal screws. The electrical insulation of the metal profile parts in the region of the connection device is achieved by plastic bushes with integrally formed collars inserted into the through-holes of the metal profile parts, which isolate the penetrating metal screws electrically from the connecting webs of the metal profile parts.

In another preferred embodiment of the demagnetization coil according to the invention, the connection profile assigned to the connection device has an additional closure profile on the outside. This is arranged opposite the middle part of the corresponding connection profile and preferably has the passage for the conductor of the coil winding in the electrical connection device coil winding on. In this case, the closure profile of the connection profile overlapped by the connection device is preferably integrally formed on the connection device, which is made of plastic material, and extends to a shortened coil cover plate, which is shorter than the other coil cover plates not overlapped by the connection device. In this way, the Entmagnetisierungsspule can be completely mounted except for the connection device, wherein the ends of the coil winding are led out between the end faces of the corresponding metal profile parts. After insertion of the conductor ends in the electrical connection device, this can be used with the end profile in the associated connection profile and preferably attached to the shortened Spulenabdeckblech.

Figur 1

eine erfindungsgemäße Entmagnetisierungsspule in perspektivischer Ansicht, mit einer von einem Spulenträgerkörper getragenen Spulenwicklung, einer die Spulenwicklung abdeckenden Spulenwicklungsabdeckung und einer an der Spulenwicklungsabdeckung angeordneten elektrischen Anschlusseinrichtung für die Spulenwicklung, wobei der Spulenträgerkörper aus U-förmigen Metallprofilteilen zusammengesetzt ist;

Figur 2

die Entmagnetisierungsspule aus Figur 1 in Stirnseitenansicht;

Figur 3

die U-förmigen Metallprofilteile des Spulenträgerkörpers aus Figur 1;

Figur 4

das Verbindungsprofil aus Figur 1 (Fig. 4a), umfassend ein Mittelteil (Figur 4b) und zwei Seitenteile (Figur 4c);

Figur 5

die elektrische Anschlusseinrichtung aus Figur 1 in Seitenansicht; und

Figur 6

Detailansichten der mittels den Verbindungsprofilen verbundenen Metallprofilteile in vergrößerter Darstellung, elektrisch leitend verbunden (Figur 6a) und elektrisch isoliert verbunden (Figur 6b).

The invention will be explained in more detail with reference to an embodiment shown in the drawing. Further features of the invention will become apparent from the following description of the embodiment of the invention in conjunction with the claims and the accompanying drawings. The individual features of the invention may be implemented on their own or in several different embodiments of the invention. Show it:

FIG. 1

a degaussing coil according to the invention in perspective view, with a coil winding carried by a coil carrier body, a coil winding cover covering the coil winding and arranged on the coil winding cover electrical connection means for the coil winding, wherein the coil support body is composed of U-shaped metal profile parts;

FIG. 2

the degaussing coil off FIG. 1 in frontal view;

FIG. 3

the U-shaped metal profile parts of the bobbin body FIG. 1 ;

FIG. 4

the connection profile FIG. 1 ( Fig. 4a ), comprising a central part ( FIG. 4b ) and two side parts ( Figure 4c );

FIG. 5

the electrical connection device FIG. 1 in side view; and

FIG. 6

Detailed views of the metal profiles connected by the connection profiles in an enlarged view, electrically connected ( FIG. 6a ) and electrically isolated ( FIG. 6b ).

The FIG. 1 shows an embodiment of the degaussing coil according to the invention in a perspective view and the FIG. 2 the corresponding embodiment with a view of the front side of the degaussing coil. The demagnetization coil 1 for the demagnetization of ferromagnetic parts has a coil carrier body 2, which comprises a tubular central portion 3 with flanges 4 adjoining it on both sides, preferably in parallel planes. The coil carrier body 2 carries a multi-wound around the central portion 3 insulated electrical conductor which forms a coil winding 25. The coil winding 25 is in the FIGS. 1 . 2 not shown and only in the FIG. 5 visible, noticeable. The ends of this electrical conductor of the coil winding 25 are led into an electrical connection device 5, which is provided for connection of a power supply cable. The coil carrier body 2 is closed to the outside via a multi-part lid-like coil winding cover 6 which extends over the coil winding 25, not shown, between the flanges 4 of the coil carrier body 2. The multi-part coil winding cover 6 comprises four Spulenabdeckbleche 7, 7 ', which are arranged on the coil carrier body 2 top, bottom, right and left and are screwed several times with the two flanges 4.

In the illustrated embodiment, the tubular central portion 3 of the coil carrier body 2 has a square cross-sectional shape. The coil carrier body 2 is in the illustrated embodiment of four identically shaped metal profile parts 8 made of non-ferromagnetic steel with in Essentially composed of U-shaped cross-sectional shape, one of which in the FIG. 3 is shown in perspective view. The four steel profile parts 8 are mechanically connected to each other at the end in a ring-shaped manner, the bases 9 of which form the middle section 3 and the legs 10 of which form the flanges 4 of the coil carrier body 2. In this case, 8 U-shaped connecting profiles 12 are arranged between the end faces 11 of the steel profile parts, which are preferably made of a plastic material.

The steel profile parts 8 are produced as folded steel sheet blanks and have on their legs 10 integrally formed connecting webs 13, 13 'which project laterally outwardly from the legs 10 and through holes 14 for screwing each other and with the Spulenabdeckblechen 7, 7' have. The legs 10 of the steel profile parts 8 are orthogonal to the base 9 of the steel profile parts 8. At the end faces 11 of the steel profile parts 8, the legs 10 and the connecting webs 13 'at an angle of 45 ° inclined relative to the base 9. On the longitudinal sides 15 of Steel profile parts 8 extend the connecting webs 13 to the opposite parallel to the base 9 along the legs 10th

The U-shaped connection profiles 12 between the end faces 11 of the steel profile parts 8 are preferably made of plastic material and like the FIGS. 4a-4c show, formed in several pieces. They comprise two identically designed side parts 16 and a middle part 17, which can be coupled together, wherein the side parts 16, as in the Figure 4c can be seen, the through holes 14 of the steel profile parts 8 associated openings 18 for the screw 24 have. The middle part 17 has, like the FIG. 4b can be removed, recesses 19 for the frontal recording of the bases 9 of the steel profile parts 8. It is similar to an angle bar formed with a rounded contact surface 20 which connects the bases 9 of the adjacent steel profile parts 8 together. On the other hand, the side parts 16 of the connection profiles 12 are designed as flat strips.

The steel profile parts 8 of the demagnetization coil 1 according to the invention are connected to each other at least at one of the connection profiles 8 against each other electrically isolated. The electrically insulated connection is arranged directly on the connection device 5 in the illustrated embodiment. The Spulenabdeckbleche 7, 7 'are electrically non-electrically connected to each other at this point. In order to allow a passage of the conductor of the coil winding 25 to the electrical connection device 5, the overlapped by the connecting device 5 Spulenabdeckblech 7 'is shorter than the other three Spulenabdeckbleche 7. At the connection device 5, a closure profile 21 is formed, which the gap between the Spulenabdeckblechen 7, 7 'closes and engages in the connection profile 12. The closure profile 21 extends from the side parts 16 of the connection profile 12 up to the shortened coil cover plate 7 '.

The FIGS. 6 and 6a show the junctions of the steel profile parts 8 with the connection profiles 12 in an enlarged view, wherein the FIG. 6a the electrically insulated connection point in the region of the connection device 5 and the FIG. 6b one of the other joints illustrates. In the electrically interconnected interconnected steel profile parts 8 metal bushings 22 are arranged in the openings 18 of the side parts 16 of the connection profiles 12, where the connecting webs 13 'when screwing the steel profile parts 8 can support each other and in the electrically insulated steel profile parts 8 plastic bushings 23 to the Through holes 14 of the connecting webs 13 of the steel profile parts 8 are arranged, which prevent the respective screw 24 contact the connecting webs 13 'of the legs 10 of the steel profile parts 8.

Claims (15)

Degaussing coil (1) for demagnetizing ferromagnetic parts, comprising a coil carrier body (2) having a tubular central portion (3) with flanges (4) adjoining them on both sides, preferably in parallel planes, with one of the coil carrier bodies (2), around the middle section (3) of multiple wound insulated electrical conductors forming a coil winding (25) and with a multi-part cover-like coil winding cover (6) extending over the coil winding (25) between the flanges (4), characterized in that the coil carrier body (2) is composed of at least two metal profile parts (8) with a U-shaped cross-sectional shape which are annularly mechanically connected to each other at the front end and whose bases (9) are the middle section (3) and whose legs (10) are the flanges (4) of the Coil carrier body (2) form, wherein between the end faces (11) of the metal profile parts (8) U-shaped connecting profiles (12) are arranged and the metal profile parts (8) at least at a connecting profile (12) are electrically insulated from each other. Degaussing coil according to claim 1, characterized in that the connecting profiles (12) are formed in several pieces and a Central part (17) and two identically formed side parts (16), which can be coupled together. Degaussing coil according to claim 1 or 2, characterized in that the coil winding cover (6) the metal profile parts (8) associated Spulenabdeckbleche (7, 7 '). Degaussing coil according to one of the preceding claims, characterized in that the tubular central portion (3) of the coil carrier body (2) has a rectangular, preferably square cross-sectional shape. Degaussing coil according to one of the preceding claims, characterized in that the legs (10) of the metal profile parts (8) integrally formed connecting webs (13, 13 ') which project laterally outwardly from the legs (10) and through holes (14) for a screw connection (24) with each other and with the Spulenabdeckblechen (7, 7 '). Degaussing coil according to one of the preceding claims, characterized in that the metal profile parts (8) are formed identically in shape. Degaussing coil according to one of the preceding claims, characterized in that the metal profile parts (8) are bent sheet steel blanks or aluminum sheet blanks. Degaussing coil according to one of the preceding claims, characterized in that the central part (17) of the connecting profiles (12) has a base (9) of the metal profile parts (8) connecting rounded contact surface (20) for the coil winding (25). Degaussing coil according to one of the preceding claims, characterized in that the connecting profiles (12) are plastic parts and that the connecting profiles (12) the through holes (14) of the connecting webs (13 ') associated openings (18) for the screw (24). Degaussing coil according to claim 9, characterized in that in electrically interconnected metal profile parts (8) metal bushings (22) in the openings (18) of the connection profiles (12) and / or electrically insulated metal profile parts (8) plastic bushings (23) at the through holes (14) of the connecting webs (13 ') of the metal profile parts (8) are arranged. Demagnetization coil according to one of the preceding claims, characterized in that an electrical connection device (5) for the coil winding (25) and a power supply cable is arranged on one of the coil cover plates (7, 7 '), wherein the connection device (5) of one of the connection profiles (12 ) at least partially overlaps. Degaussing coil according to Claim 11, characterized in that at least the connection profile (12) assigned to the connection device (5) has a passage for the conductor of the coil winding (25). Degaussing coil according to claim 11 or 12, characterized in that the metal profile parts (8) and the Spulenabdeckbleche (7, 7 ') of the coil carrier body (2) only at the said electrical connection device (5) associated connection profile (12) connected to each other electrically non-conductive are. Degaussing coil according to one of claims 11 to 13, characterized in that on which the connection device (5) associated connection profile (12) outside an additional closure profile (21) is arranged. Degaussing coil according to Claim 14, characterized in that the coil cover plate (7 ') overlapped by the connection device (5) is shorter than the other coil cover plates (7), the closure profile (21) being integrally formed on the connection device (5) up to the shortened Spulenabdeckblech (7 ') extends and the gap between the Spulenabdeckblechen (7, 7') and the connecting profile (12) closes.

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