EP2759508B1 - Load-lifting magnet with rotary drive - Google Patents

Load-lifting magnet with rotary drive Download PDF

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Publication number
EP2759508B1
EP2759508B1 EP13152564.4A EP13152564A EP2759508B1 EP 2759508 B1 EP2759508 B1 EP 2759508B1 EP 13152564 A EP13152564 A EP 13152564A EP 2759508 B1 EP2759508 B1 EP 2759508B1
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EP
European Patent Office
Prior art keywords
load
lifting magnet
rotary drive
lifting
stator
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EP13152564.4A
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German (de)
French (fr)
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EP2759508A1 (en
Inventor
René Sterchi
Bernhard Naef
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Starmag AG
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Starmag AG
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/04Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by magnetic means

Definitions

  • the present invention relates to a lifting magnet with a rotary drive according to the preamble of claim 1 and the use of such a lifting of suitable load.
  • Lifting magnets are for example from the GB 1,213,962 known.
  • This document discloses a lifting magnet with a stator and underlying rotor, each having a permanent magnet.
  • the permanent magnets form parts of a magnetic circle.
  • the GB 1,213,962 teaches that the rotor can be rotated manually by means of a handle by 180 ° between an off rest position and a working position switched on. The disadvantage here is that sometimes considerable force is necessary to move the lever. In the working position, a workload can be recorded. An applied load in this case influences the magnetic circuit in such a way that a force for transferring the handle becomes smaller.
  • a lifting magnet of the type mentioned is known from EP 2 532 615 A1 known.
  • the present invention is therefore based on the object to provide a lifting magnet or lifting magnet of the type mentioned, which is safely switchable without contact to the workload.
  • a lifting magnet for frictionally receiving magnetic load comprises: at least one stator with a first permanent magnetic element, at least one rotor associated with the stator with a second permanent magnetic element and at least one contact element for receiving the load, wherein the at least one rotor by means of a rotary drive relative to the stator from a receiving position in which is provided by the first and second permanent magnetic element, a magnetic force for receiving the load on the contact element, in a release position in which the magnetic force the load releasably reduced, is rotatable, characterized in that the first permanent magnetic element of the stator in the main direction of the magnetic force on the load to the second permanent magnetic element of the rotor connects and between the second permanent magnetic element of the rotor and the contact element is located.
  • the first and second permanent magnetic elements are preferably substantially identical elements, which are installed so that they give by rotation relative to each other a changed resulting magnetic field on the contact element. It is preferred that the rotary drive is a hydraulic rotary drive. Thus, this requires no electrical leads and is easy to use.
  • the lifting magnet is operated without power and without a lifting cylinder. It is further preferred that a first axis of the rotary drive in the axial direction to a second axis of the rotor connects and the rotary drive is preferably mounted directly on the second axis. This makes a compact and stable construction possible. It is further preferred that the rotary drive is offset from the horizontal center of the stator in the longitudinal direction of the lifting magnet on the rotor, so that in the longitudinal direction of the stator in the direction of the rotary drive, in the region below the rotary drive to the plane of the contact element, a free space over preferably an entire depth or width of the lifting magnet consists. Thus, the rotary actuator is better protected against impacts from below.
  • the rotor, the stator and preferably also the contact element are substantially the same length in the longitudinal direction of the lifting magnet. So the space in the lifting magnet is optimally used.
  • the rotary drive is surrounded by a protective cover, which protects the rotary drive against impacts from below, wherein the protective cover in the longitudinal direction of the lifting magnet is preferably formed obliquely upward tapering in the longitudinal direction, without filling the free space.
  • the protective cover is substantially U-shaped and surrounds the rotary drive from below. Further, it is advantageous if this protective cover with profile legs, the rotary drive also extends beyond the top and in the longitudinal direction of the lifting magnet to provide improved protection.
  • stator is rotatable 180 degrees relative to the rotor.
  • extremes of the magnetic loop i. minimum and maximum magnetic field
  • the full power spectrum of the active circuit can be used. Due to the use of a rotary drive this is possible because there are no dead points in the mechanics.
  • the lifting magnet has a housing around the magnet unit formed of rotor and stator.
  • this housing is U-shaped and surrounds the magnet unit from above.
  • the housing is not ferromagnetic, behaves magnetically passive, and mechanically protects the magnet unit and allows to mount on top a flange or suspension for mounting the lifting magnet.
  • the cover is a molded, stable sheet.
  • the housing in the region facing away from the contact element has a preferably trough-shaped reinforcing element over the rotor, which extends over the depth or width and the length of the housing and is fastened thereto in order to increase the mechanical stability.
  • This tub is preferably reinforced by arranged in the tub ribs and bolted to the upwardly facing surface of the stator and against the profile legs of the housing cover.
  • the lifting magnets are connected via at least one beam or sheet-like support member to a lifting magnet unit, wherein it is preferred that the lifting magnets are in particular mounted horizontally rotatable on the support member. It is particularly preferred that two lifting magnets are fastened to a support element, for example a steel frame, by means of a suspension device, wherein the suspension device is set up to rotate the lifting magnets about a vertical direction as a rotation axis.
  • the present invention also relates to a use of the lifting magnet as described above or a lifting magnet unit as described above for receiving magnetic load and, after any movement of the lifting magnet together with the load, for subsequent release of the load.
  • this lifting magnet or this lifting magnet unit can be used for vacuum cleaner-like collection of scattered on the ground magnetic small parts.
  • the contact surface of the switched-magnet is guided in a small height of about 5 to 25 centimeters above the ground, such that the magnetic small parts of the effect of the magnetic circuit are exposed and pulled to the contact surface and reach the plant.
  • the optimal distance to the ground depends on the strength of the magnetic circle and the weight of the small parts. If an intended number of small parts adhere to the contact surface, the user guides the magnet to a predetermined location and switches off the magnet, whereupon the small parts are released and fall to the ground due to gravity.
  • Figures 1 and 2 show, in a perspective view from above or below, a preferred embodiment of the inventive lifting magnet 1.
  • the lifting magnet 1 shown is suitable for use on construction sites, for example.
  • the lifting magnet 1 is substantially cuboid and dimensioned so that payloads of about 50 to 1500 kilograms or more, depending on the embodiment, can be moved.
  • a typical longitudinal extent of the lifting magnet 1 is about 25 to 100 centimeters, depending on lifting capacity and design.
  • Preferred embodiments are a lifting magnet 1 with a longitudinal extent of about 50 centimeters and a lifting capacity of up to 1000 kilograms and a lifting magnet 1 with a longitudinal extent of about 100 centimeters and a lifting capacity of up to 2000 kilograms (safety factor 3).
  • the lifting magnet 1 has a housing 3 with a housing cover 30, GeHousestimrentn 34b and two contact elements 35.
  • the housing 3 is preferably made of non-magnetic material, in particular metal or plastic and surrounds a magnetic rotor 20 and a magnetic stator 10 (s. Fig. 6 ).
  • the housing cover 30 is of U-shaped cross-sectional shape and overlaps with lateral profile legs rotor 20 and stator 10 from above.
  • the flat planes Profile legs extend substantially to the lower end of the stator 10, where the abutment elements 35 are mounted.
  • the housing cover 30 has rounded top edges 32, between which a flat top surface 33 extends, the latter connecting the two profile legs.
  • the housing 3 is preferably detachably fastened via screw connections 31 on the lifting magnet 1, in particular on the stator 10.
  • the top surface 33 has threaded holes 33a, which serve to attach a suspension 5 of the lifting magnet 1 (s. Fig. 8 ).
  • At front end surfaces of the stator 10 frame 34 are screwed with central recess 34a.
  • the housing cover 30 surrounds these frames 34, wherein the frame 34 and the housing cover 30 are preferably welded firmly.
  • a rotary drive 40 is connected to the end face of the housing wall 34b.
  • the rotary drive 40 is hydraulic, so needs no electrical leads and is surrounded by a protective cover 4.
  • the protective cover 4 is U-shaped with a bottom element 43 and two projecting profile legs 44, 45 and surrounds the rotary drive 40 from below.
  • the protective cover 4 adjoins the housing limiting wall 34b and extends longitudinally beyond the rotary drive 40.
  • the profile legs 44, 45 extend with their free end portion to above the rotary drive 40 upwards.
  • the protective cover 4 thus surrounds or overlaps the rotary drive 40 in a protective manner against impacts from all directions, in particular from below and the side (left, right in FIG Fig. 1 ).
  • a strut 46 is mounted, which the two upper corners of the freestanding end portions of the profile legs 44, 45th combines. This strut 46 provides further protection for the rotary drive 40 and stabilizes the protective cover 4 mechanically.
  • the strut 46 is rounded in the longitudinal direction and upwards.
  • the protective cover is completely closed at the front and / or at the top.
  • the protective cover 4 surrounds the rotary drive 40 completely or completely. These designs protect the rotary drive 40 better, but are heavier.
  • the embodiment with open end according to Figs. 1, 2 has on a rotational axis 42 of the rotary drive 40 a rotatably mounted display element 47 in the form of a pointer.
  • This pointer 47 is visible from the outside by a user of the device 1 through the open end of the protective cover 4 and indicates the instantaneous relative arrangement between the stator 10 and rotor 20 at.
  • the pointer 47 thus serves as a rotational position indicator of the rotor 20.
  • the rotational position indicator may also include a scale over which the pointer 47 wipes or to which the pointer 47 indicates, which facilitates the reading of the current rotational position.
  • the abutment elements 35 which are spaced transversely to the longitudinal direction, are structured with a plurality of lattice-like intersecting grooves.
  • This profiling increases the investment stability of the payload on the contact element 35.
  • Such profiling is optional and particularly advantageous if the payload is dusty or has pebble-like contaminants on the outside. Thanks to this profiling, said impurities can be displaced in grooves of the profiling. The unwanted air gap between payload and contact element 35 due to the contamination is thereby reduced and the magnetic payload can come closer to the active circuit, whereby the performance of the lifting magnet 1 is better utilized.
  • smooth abutment elements 35 are provided.
  • the abutment member 35 may be made of hard material such as steel, preferably ferromagnetic material.
  • the contact element can be coated with a damping layer, for example of rubber. It is conceivable to attach profiled rubber profiles to the contact surface.
  • the damping layer has an advantageous effect on the stability of the system and reduces the noise emission during load absorption. How out Fig. 6 it can be seen, the contact elements 35 are bolted to the stator 10.
  • a cover 35b closes the gap between the two Plant elements 35 such that a longitudinal recess 35c in the downwardly directed contact surface, which is spanned by the contact elements 35, is formed. This stabilizes the installation of the payload and allows it to come closer to the magnet unit 10, 20 in the middle region, whereby an acting force due to the magnetic circuit is increased.
  • FIGS. 3 and 4 show the lifting magnet 1 according Figs. 1, 2 , where in Fig. 3
  • the housing cover 30 and in Fig. 4 further also the rotary drive 40 are omitted.
  • Fig. 3 the lateral outer surface of the stator 10 is visible.
  • the stator 10 extends upwardly from the abutment element 35 substantially over the entire width or depth of the lifting magnet 1 parallel to the profile legs of the housing cover 30 and tapers in the region in which the rotor 20 is arranged (see also FIG Fig. 6 ).
  • threaded holes 13 are provided for the screw 31 for fixing the cover 30.
  • the cover 30 fits snugly in sections against the stator 10.
  • a trough 36 is mounted, which is preferably fastened to the stator 10, in particular festschraubbar and extends over the entire length of the stator 10 and the width of the lifting magnet 1.
  • mounting holes 38 are provided for screw with nuts.
  • transversely extending ribs 37 are provided in the longitudinal direction at regular intervals between the mounting holes 38, which fill the cross-sectional shape of the trough 36, thus segmenting the trough 36 and thus mechanically stiffening and stabilizing the entire lifting magnet 1. How out Fig. 6 can be seen, the trough 36 has similar curves as the housing cover 30.
  • the trough 36 has recesses 36a in the bottom area, in which corresponding or corresponding nubs of the ribs 37 engage. These serve to position the ribs 37 in the tub 36 before the ribs 37 and the tub 36 are welded.
  • FIG. 4 shows that the rotary drive 40 is pushed directly onto a shaft 22 of the stator 10. This direct coupling allows a simple and robust construction.
  • FIG. 5 shows a longitudinal cross section in the middle by the lifting magnet 1. It is in the lower Area a first permanent magnetic element 11 which is fixedly arranged in the stator 10 (s. Fig. 6 ) recognizable. Vertically above it is a second permanent magnetic element 21 of the rotor 20.
  • the two permanent magnetic elements 11, 21 are cuboidal, extend substantially over the entire length of the stator 10 and rotor 20 and are of the same construction.
  • the rotor 20 is arranged in the upper region of the stator 10, where it is rotatably mounted.
  • the rotor 20 extends in the stator 10 substantially over its entire length.
  • Fig. 5 is also shown how the shaft 22 of the rotor 20 engages in the rotary drive 40, wherein an axis 42 of the rotary drive coincides with the axis of the shaft 22.
  • FIG. 6 (BB cut, s. Fig. 5 ) it can be seen that the first permanent-magnetic element 11 is fixed in the center of the stator 10. And the second permanent magnetic element 21 is located directly above.
  • the stator 10 essentially consists of two halves, which surround the rotor 20 on each side, said halves having recesses into which the rotor 20 engages.
  • the stator 10 is designed such that it projects the rotor 20 still tapering above and forming a triangular cross-section and down the rotor 20 more than upwardly projecting two feet provides, the abutment elements 35 and the cover 35b.
  • the stator 10 and the rotor 20 are made of magnetic, in particular ferromagnetic material and form with the magnets 11, 21, the magnetic circuit, which provides a magnetic force for receiving the load on the contact element depending on the relative position of the two magnets (recording position) or the magnetic force releasably reduces the load (release position).
  • FIG. 7 shows a cross section through an end portion of the lifting magnet 1 (AA section, s. Fig. 5 )
  • the rotary drive 40 is arranged at a distance from the contact element 35. This clearance of the rotary drive 40 upwards creates a free space 15 below the rotary drive 40. This free space 15 extends below the protective cover 4 from the housing wall 34b to the outside and the width or depth of the lifting magnet 1. As in particular from Fig. 5 can be seen, the protective cover extends away from the housing end wall 34b obliquely upward. This Free space is therefore about 5 to 25 centimeters high and as wide or deep as the lifting magnet 1. The displacement of the rotary drive 40 upwards, ie away from the ground, when the lifting magnet 1 is in operation, protects the rotary actuator 40 in addition to punches.
  • FIG. 8 shows a lifting magnet unit 2 with two lifting magnets 1, which are connected via a support member 4.
  • the lifting magnets 1 are individually connected via plates 51 which are screwed onto the top surfaces 33 of the housing 3 of the lifting magnet 1, and an articulated suspension 5 to the support member 4.
  • the suspensions 5 are guided through a slot 4 a through the support element 4 and above positively locked.
  • a distance in the longitudinal direction of the support member 4 between the lifting magnet 1 is selectable and adjustable.
  • the support element 4 can be coupled with a cable or excavator arm or the like.
  • a payload magnetic 6, a double T-bar is shown.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)

Description

TECHNISCHES GEBIETTECHNICAL AREA

Die vorliegende Erfindung betrifft einen Hebemagneten mit einem Drehantrieb gemäss Oberbegriff des Anspruchs 1 und die Verwendung eines solchen zum Heben von geeigneter Last.The present invention relates to a lifting magnet with a rotary drive according to the preamble of claim 1 and the use of such a lifting of suitable load.

STAND DER TECHNIKSTATE OF THE ART

Lasthebemagnete sind beispielsweise aus der GB 1,213,962 bekannt. Diese Druckschrift offenbart einen Lasthebemagneten mit einem Stator und darunter liegenden Rotor, welche jeweils einen Permanentmagneten aufweisen. Eine derartige Bauart erlaubt, eine Vorrichtung mit kompakten Abmessungen bereitzustellen. Die Permanentmagnete bilden hierbei Teile eines magnetischen Wirkkreises. Die GB 1,213,962 lehrt, dass der Rotor manuell mittels eines Handgriffes um 180° zwischen einer ausgeschalteten Ruhelage und einer eingeschalteten Arbeitslage drehbar ist. Nachteilig ist hierbei, dass teils erheblichem Kraftaufwand notwendig ist, um den Hebel umzulegen. In der Arbeitslage kann eine Arbeitslast aufgenommen werden. Eine anliegende Last beeinflusst den magnetischen Wirkkreis hierbei nun derart, dass eine Kraft zum Umlegen des Handgriffs kleiner wird. Derartige manuelle Lasthebemagnete sind also oft erst in Kontakt mit einer bestimmungsgemässen Last schaltbar, da die ansonsten benötigte Kraft zum Umlegen des Hebels die Muskelkraft eines Benutzers Ă¼bersteigt oder aber ein freihängender Lasthebemagnet in Reaktion auf den Schaltversuch ungĂ¼nstig verschwenkt wird. Bei einem freihängenden Lasthebemagneten dieser Bauform, kann es somit vorkommen, dass die benötigte Kraft zum Umlegen des Hebels derart gross ist, dass sich der gesamte freihängende Lasthebemagnet wegdreht, bevor der Rotor die gewĂ¼nschte Lage erreicht. Um eine Reaktionsbewegung des Lasthebemagneten aufgrund einer Reaktionskraft auf eine Krafteinwirkung durch den Benutzer auf den Hebel zu vermeiden, muss der Benutzer der hervorgerufenen Reaktionsbewegung entgegenwirken, was nachteilig umständlich, aufwändig und risikoreich ist. Zudem muss der Benutzer zur Betätigung des Hebemagneten stets in unmittelbarer Nähe der Hebevorrichtung sein, was ebenfalls ein Nachteil istLifting magnets are for example from the GB 1,213,962 known. This document discloses a lifting magnet with a stator and underlying rotor, each having a permanent magnet. Such a design allows to provide a device with compact dimensions. The permanent magnets form parts of a magnetic circle. The GB 1,213,962 teaches that the rotor can be rotated manually by means of a handle by 180 ° between an off rest position and a working position switched on. The disadvantage here is that sometimes considerable force is necessary to move the lever. In the working position, a workload can be recorded. An applied load in this case influences the magnetic circuit in such a way that a force for transferring the handle becomes smaller. Such manual lifting magnets are therefore often only in contact with a normal load switchable because the otherwise required force for moving the lever exceeds the muscle power of a user or a freely suspended lifting magnet is pivoted unfavorable in response to the switching attempt. In a free-hanging lifting magnet of this design, it may thus happen that the force required to move the lever is so large that the entire free-hanging lifting magnet rotates away before the rotor the desired Location reached. To avoid a reaction movement of the lifting magnet due to a reaction force on a force applied by the user to the lever, the user must counteract the evoked reaction movement, which is disadvantageous cumbersome, consuming and risky. In addition, the user must always be in the immediate vicinity of the lifting device for operating the lifting magnet, which is also a disadvantage

Ein Lasthebemagnet der Eingangs gennanten Art ist aus der EP 2 532 615 A1 bekannt.A lifting magnet of the type mentioned is known from EP 2 532 615 A1 known.

DARSTELLUNG DER ERFINDUNGPRESENTATION OF THE INVENTION

Der vorliegenden Erfindung liegt also die Aufgabe zu Grunde, einen Lasthebemagneten bzw. Hebemagneten eingangs genannter Art anzugeben, welcher ohne Kontakt zur Arbeitslast sicher schaltbar ist.The present invention is therefore based on the object to provide a lifting magnet or lifting magnet of the type mentioned, which is safely switchable without contact to the workload.

Diese und weitere Aufgaben werden durch einen Hebemagneten nach Anspruch 1 gelöst, wobei der Hebemagnet zur kraftschlĂ¼ssigen Aufnahme von magnetischer Last umfasst: mindestens einen Stator mit einem ersten permanentmagnetischen Element, mindestens einen dem Stator zugeordneten Rotor mit einem zweiten permanentmagnetischen Element und mindestens ein Anlageelement zur Aufnahme der Last, wobei der mindestens eine Rotor mittels eines Drehantriebs relativ zum Stator aus einer Aufnahmeposition, in welcher durch das erste und zweite permanentmagnetische Element eine magnetische Kraft zur Aufnahme der Last am Anlageelement zur VerfĂ¼gung gestellt ist, in eine Freigabeposition, in welcher die magnetische Kraft die Last freigebend reduziert ist, rotierbar ist, dadurch gekennzeichnet, dass das erste permanentmagnetische Element des Stators in Hauptwirkrichtung der magnetischen Kraft auf die Last an das zweite permanentmagnetischen Element des Rotor anschliesst und zwischen dem zweiten permanentmagnetischen Element des Rotors und dem Anlageelement liegt.These and other objects are achieved by a lifting magnet according to claim 1, wherein the lifting magnet for frictionally receiving magnetic load comprises: at least one stator with a first permanent magnetic element, at least one rotor associated with the stator with a second permanent magnetic element and at least one contact element for receiving the load, wherein the at least one rotor by means of a rotary drive relative to the stator from a receiving position in which is provided by the first and second permanent magnetic element, a magnetic force for receiving the load on the contact element, in a release position in which the magnetic force the load releasably reduced, is rotatable, characterized in that the first permanent magnetic element of the stator in the main direction of the magnetic force on the load to the second permanent magnetic element of the rotor connects and between the second permanent magnetic element of the rotor and the contact element is located.

Das erste und das zweite permanentmagnetische Element sind vorzugsweise im Wesentlichen baugleiche Elemente, welche so eingebaut sind, dass sie durch Verdrehen relativ zueinander ein verändertes resultierendes Magnetfeld am Anlageelement ergeben. Es ist bevorzugt, dass der Drehantrieb ein hydraulischer Drehantrieb ist. Somit benötigt dieser keine elektrischen Zuleitungen und ist einfach in der Anwendung.The first and second permanent magnetic elements are preferably substantially identical elements, which are installed so that they give by rotation relative to each other a changed resulting magnetic field on the contact element. It is preferred that the rotary drive is a hydraulic rotary drive. Thus, this requires no electrical leads and is easy to use.

Es ist also bevorzugt, dass der Hebemagnet stromfrei und ohne Hubzylinder betreibbar ist. Es ist weiter bevorzugt, dass eine erste Achse des Drehantriebs in axialer Richtung an eine zweite Achse des Rotors anschliesst und der Drehantrieb vorzugsweise direkt auf die zweite Achse montiert ist. Dadurch ist eine kompakte und stabile Bauweise möglich. Es ist weiterhin bevorzugt, dass der Drehantrieb versetzt zur horizontalen Mitte des Stators in Längsrichtung des Hebemagneten am Rotor anschliesst, sodass in Längsrichtung vom Stator in Richtung des Drehantriebs, im Bereich unterhalb des Drehantriebs zur Ebene des Anlageelements hin, ein Freiraum Ă¼ber vorzugsweise eine gesamte Tiefe bzw. Breite des Hebemagneten besteht. Damit ist der Drehantrieb besser vor Schlägen von unten geschĂ¼tzt. Vorzugsweise sind der Rotor, der Stator und vorzugsweise auch das Anlageelement im Wesentlichen gleich lang in Längsrichtung des Hebemagneten. So ist der Raum im Hebemagneten optimal genutzt.It is therefore preferred that the lifting magnet is operated without power and without a lifting cylinder. It is further preferred that a first axis of the rotary drive in the axial direction to a second axis of the rotor connects and the rotary drive is preferably mounted directly on the second axis. This makes a compact and stable construction possible. It is further preferred that the rotary drive is offset from the horizontal center of the stator in the longitudinal direction of the lifting magnet on the rotor, so that in the longitudinal direction of the stator in the direction of the rotary drive, in the region below the rotary drive to the plane of the contact element, a free space over preferably an entire depth or width of the lifting magnet consists. Thus, the rotary actuator is better protected against impacts from below. Preferably, the rotor, the stator and preferably also the contact element are substantially the same length in the longitudinal direction of the lifting magnet. So the space in the lifting magnet is optimally used.

In einer Weiterbildung ist der Drehantrieb mit einer Schutzabdeckung umgeben, welche den Drehantrieb gegen Schläge von unten schĂ¼tzt, wobei die Schutzabdeckung in Längsrichtung des Hebemagneten vorzugsweise in Längsrichtung schräg nach oben zulaufend geformt ist, ohne den Freiraum auszufĂ¼llen. Vorteilhafterweise ist die Schutzabdeckung im Wesentlichen U-förmig und umgreift den Drehantrieb von unten. Weiter ist es vorteilhaft, wenn diese Schutzabdeckung mit Profilschenkeln den Drehantrieb auch nach oben und in Längsrichtung des Hebemagneten Ă¼berragt, um verbesserten Schutz zu bieten.In a further development, the rotary drive is surrounded by a protective cover, which protects the rotary drive against impacts from below, wherein the protective cover in the longitudinal direction of the lifting magnet is preferably formed obliquely upward tapering in the longitudinal direction, without filling the free space. Advantageously, the protective cover is substantially U-shaped and surrounds the rotary drive from below. Further, it is advantageous if this protective cover with profile legs, the rotary drive also extends beyond the top and in the longitudinal direction of the lifting magnet to provide improved protection.

Es ist bevorzugt, dass der Stator relativ zum Rotor um 180 Grad rotierbar ist. Damit sind die Extrema des magnetischen Wirkkreises, d.h. minimales und maximales Magnetfeld, einsetzbar und das volle Leistungsspektrum des Wirkkreises ist einsetzbar. Aufgrund der Verwendung eines Drehantriebes ist dies möglich, da keine Totpunkte in der Mechanik existieren.It is preferred that the stator is rotatable 180 degrees relative to the rotor. Thus, the extremes of the magnetic loop, i. minimum and maximum magnetic field, can be used and the full power spectrum of the active circuit can be used. Due to the use of a rotary drive this is possible because there are no dead points in the mechanics.

Es ist bevorzugt, dass der Hebemagnet ein Gehäuse um die Magneteinheit gebildet aus Rotor und Stator aufweist. Vorzugsweise ist dieses Gehäuse U-förmig und umgreift die Magneteinheit von oben. Vorzugsweise ist das Gehäuse nicht ferromagnetisch, verhält sich magnetisch passiv, und schĂ¼tzt die Magneteinheit mechanisch und erlaubt, auf der Oberseite einen Flansch oder eine Aufhängung zur Montage des Hebemagneten anzubringen. Vorzugsweise ist die Abdeckung ein geformtes, stabiles Blech.It is preferred that the lifting magnet has a housing around the magnet unit formed of rotor and stator. Preferably, this housing is U-shaped and surrounds the magnet unit from above. Preferably, the housing is not ferromagnetic, behaves magnetically passive, and mechanically protects the magnet unit and allows to mount on top a flange or suspension for mounting the lifting magnet. Preferably, the cover is a molded, stable sheet.

Es ist weiter bevorzugt, dass das Gehäuse im dem Anlageelement abgewandten Bereich Ă¼ber dem Rotor ein vorzugsweise wannenförmiges Verstärkungselement aufweist, welches sich Ă¼ber die Tiefe bzw. Breite und die Länge des Gehäuses erstreckt und an diesem befestigt ist, um die mechanische Stabilität zu erhöhen. Diese Wanne ist vorzugsweise mittels in der Wanne angeordneter Rippen verstärkt und auf die nach oben weisende Fläche des Stators und gegen die Profilschenkel der Gehäuseabdeckung verschraubt.It is further preferred that the housing in the region facing away from the contact element has a preferably trough-shaped reinforcing element over the rotor, which extends over the depth or width and the length of the housing and is fastened thereto in order to increase the mechanical stability. This tub is preferably reinforced by arranged in the tub ribs and bolted to the upwardly facing surface of the stator and against the profile legs of the housing cover.

In einer Weiterbildung sind die Hebemagneten Ă¼ber mindestens ein balken- oder flächenartiges Tragelement zu einer Hebemagneteinheit verbunden, wobei bevorzugt ist, dass die Hebemagneten insbesondere horizontal rotierbar am Trageelement befestigt sind. Besonders bevorzugt ist, dass zwei mittels einer Aufhängevorrichtung an einem Trageelement, bspw. einem Stahlrahmen befestigte Hebemagneten umfasst sind, wobei die Aufhängevorrichtung eingerichtet ist, die Hebemagneten um eine Lotrichtung als Drehachse zu rotieren.In a further development, the lifting magnets are connected via at least one beam or sheet-like support member to a lifting magnet unit, wherein it is preferred that the lifting magnets are in particular mounted horizontally rotatable on the support member. It is particularly preferred that two lifting magnets are fastened to a support element, for example a steel frame, by means of a suspension device, wherein the suspension device is set up to rotate the lifting magnets about a vertical direction as a rotation axis.

Die vorliegende Erfindung betrifft auch eine Verwendung des Hebemagneten wie oben beschrieben oder einer Hebemagneteinheit wie oben beschrieben zur Aufnahme von magnetischer Last und, nach einer allfälligen Bewegung des Hebemagneten mitsamt der Last, zur anschliessenden Freigabe der Last.The present invention also relates to a use of the lifting magnet as described above or a lifting magnet unit as described above for receiving magnetic load and, after any movement of the lifting magnet together with the load, for subsequent release of the load.

Besonders vorteilhaft kann dieser Hebemagnet oder diese Hebemagneteinheit zur staubsaugerartigen Sammlung von auf dem Boden zerstreut liegenden magnetischen Kleinteilen eingesetzt werden. Hierzu wird die Anlagefläche des eingeschalteten Magneten in einer geringen Höhe von etwa 5 bis 25 Zentimeter Ă¼ber den Boden gefĂ¼hrt, derart, dass die magnetischen Kleinteile der Wirkung des magnetischen Wirkkreises ausgesetzt sind und zur Anlagefläche gezogen und dort zur Anlage gelangen. Die optimale Distanz zum Boden hängt von der Stärke des magnetischen Wirkkreises und dem Gewicht der Kleinteile ab. Haftet eine beabsichtigte Anzahl von Kleinteilen an der Anlagefläche, so fĂ¼hrt der Benutzer den Magneten zu einem vorbestimmten Ort und schaltet den Magneten aus, worauf die Kleinteile freigegeben und auf Grund der Gravitation zu Boden fallen.Particularly advantageous this lifting magnet or this lifting magnet unit can be used for vacuum cleaner-like collection of scattered on the ground magnetic small parts. For this purpose, the contact surface of the switched-magnet is guided in a small height of about 5 to 25 centimeters above the ground, such that the magnetic small parts of the effect of the magnetic circuit are exposed and pulled to the contact surface and reach the plant. The optimal distance to the ground depends on the strength of the magnetic circle and the weight of the small parts. If an intended number of small parts adhere to the contact surface, the user guides the magnet to a predetermined location and switches off the magnet, whereupon the small parts are released and fall to the ground due to gravity.

Weitere AusfĂ¼hrungsformen sind in den abhängigen AnsprĂ¼chen angegeben.Further embodiments are given in the dependent claims.

KURZE BESCHREIBUNG DER ZEICHNUNGENBRIEF DESCRIPTION OF THE DRAWINGS

Bevorzugte AusfĂ¼hrungsformen der Erfindung werden im Folgenden anhand der Zeichnungen beschrieben, die lediglich zur Erläuterung dienen und nicht einschränkend auszulegen sind. In den Zeichnungen zeigen:

Fig. 1
eine perspektivische Ansicht von oben auf eine bevorzugte AusfĂ¼hrungsform des erfindungsgemässen Hebemagneten;
Fig. 2
den Hebemagneten nach Fig. 1 mit Gehäuse in einer perspektivischen Ansicht von unten;
Fig. 3
den Hebemagneten nach Fig. 1 in einer weiteren perspektiven Ansicht ohne Gehäuse mit sichtbarem Drehantrieb;
Fig. 4
den Hebemagneten nach Fig. 1 ohne Gehäuse und ohne Drehantrieb;
Fig. 5
einen Längsschnitt durch den Hebemagneten nach Fig. 1;
Fig. 6
einen Querschnitt durch einen mittleren Abschnitt B-B des Hebemagneten nach Fig. 1;
Fig. 7
einen Querschnitt durch einen vorderen Abschnitt A-A des Hebemagneten nach Fig. 1; und
Fig. 8
eine Traverse mit zwei Hebemagneten nach Fig. 1, welche eine Hebemagneteinheit bilden.
Preferred embodiments of the invention will be described below with reference to the drawings, which are given by way of illustration only and are not to be interpreted as limiting. In the drawings show:
Fig. 1
a perspective view from above of a preferred Embodiment of the lifting magnet according to the invention;
Fig. 2
the lifting magnet after Fig. 1 with housing in a perspective view from below;
Fig. 3
the lifting magnet after Fig. 1 in another perspective view without housing with visible rotary drive;
Fig. 4
the lifting magnet after Fig. 1 without housing and without rotary drive;
Fig. 5
a longitudinal section through the lifting magnet according to Fig. 1 ;
Fig. 6
a cross section through a central portion BB of the lifting magnet according to Fig. 1 ;
Fig. 7
a cross section through a front portion AA of the lifting magnet according to Fig. 1 ; and
Fig. 8
a traverse with two lifting magnets behind Fig. 1 which form a lifting magnet unit.

BESCHREIBUNG BEVORZUGTER AUSFĂœHRUNGSFORMENDESCRIPTION OF PREFERRED EMBODIMENTS

Figuren 1 und 2 zeigen, in einer perspektivischen Ansicht von oben bzw. unten, eine bevorzugte AusfĂ¼hrungsform des erfindungsgemässen Hebemagneten 1. Der gezeigte Hebemagnet 1 ist geeignet fĂ¼r die Nutzung auf Baustellen bspw. als Halteelement an einem Krankabel zum Transport von magnetischen Platten oder Trägern. Der Hebemagnet 1 ist im Wesentlichen quaderförmig und so dimensioniert, dass Nutzlasten von etwa 50 bis 1500 Kilogramm oder mehr, je nach AusfĂ¼hrungsform, bewegt werden können. Eine typische Längsausdehnung des Hebemagneten 1 beträgt etwa 25 bis 100 Zentimeter, je nach Hebeleistung und Bauart. Bevorzugte AusfĂ¼hrungsformen sind ein Hebemagnet 1 mit einer Längsausdehnung von etwa 50 Zentimeter und einer Hebeleistung von bis zu 1000 Kilogramm und ein Hebemagnet 1 mit einer Längsausdehnung von etwa 100 Zentimeter und einer Hebeleistung von bis zu 2000 Kilogramm (Sicherheitsfaktor 3). Der Hebemagnet 1 weist ein Gehäuse 3 mit einer Gehäuseabdeckung 30, Gehäusestimwänden 34b und zwei Anlageelementen 35 auf. Das Gehäuse 3 ist vorzugsweise aus nicht magnetischem Material gefertigt, insbesondere Metall oder Kunststoff und umgibt einen magnetischen Rotor 20 und einen magnetischen Stator 10 (s. Fig. 6). Die Gehäuseabdeckung 30 ist von U-förmiger Querschnittsgestalt und Ă¼bergreift mit seitlichen Profilschenkeln Rotor 20 und Stator 10 von oben. Die flächig ebenen Profilschenkel reichen bis im Wesentlichen ans untere Ende des Stators 10, wo die Anlageelemente 35 angebracht sind. Die Gehäuseabdeckung 30 weist oben gerundete Längskanten 32 auf, zwischen welchen sich eine ebene Deckfläche 33 erstreckt, wobei letztere die beiden Profilschenkel verbindet. Das Gehäuse 3 ist Ă¼ber Schraubverbindungen 31 am Hebemagneten 1, insbesondere am Stator 10, vorzugsweise lösbar befestigt. Die Deckfläche 33 weist Gewindelöcher 33a auf, welche der Befestigung einer Aufhängung 5 des Hebemagneten 1 dienen (s. Fig. 8). An stirnseitigen Endflächen des Stators 10 sind Rahmen 34 mit mittiger Ausnehmung 34a angeschraubt. Die Gehäuseabdeckung 30 umgreift diese Rahmen 34, wobei die Rahmen 34 und die Gehäuseabdeckung 30 vorzugsweise fest verschweisst werden. An der oberen Querverbindung der Rahmen 34 sind nach oben abstehende Noppen bzw. Eingriffselemente 39a angebracht, welche in entsprechende Ausnehmungen 39b der Gehäuseabdeckung 30 (s. Fig. 6) eingreifen, wenn die Abdeckung 30 Ă¼ber die Rahmen 34 gestĂ¼lpt wird, womit die Rahmen 34 formschlĂ¼ssig in Längsrichtung in der Gehäuseabdeckung 30 zur Verschweissung arretierbar sind. Diese Eingriffselemente 39a dienen also als Positionierungshilfe fĂ¼r den Schweissvorgang. Die Gehäuseabdeckung 30 und die daran angeschweissten Rahmen 34 werden sodann Ă¼ber den Stator 10 mit einer Wanne 36 (s. unten) gestĂ¼lpt und am Stator 10 und mit den Gehäusestimwänden 34b fest verschraubt. Die Gehäusestimwand 34b, an welche sich die Schutzabdeckung 4 anschliesst, wirkt als Flansch fĂ¼r die Schutzabdeckung 4, mittels welchem die Schutzabdeckung 4 am Gehäuse 3 bzw. am Stator verschraubt ist. Figures 1 and 2 show, in a perspective view from above or below, a preferred embodiment of the inventive lifting magnet 1. The lifting magnet 1 shown is suitable for use on construction sites, for example. As a holding element on a crane cable for the transport of magnetic plates or carriers. The lifting magnet 1 is substantially cuboid and dimensioned so that payloads of about 50 to 1500 kilograms or more, depending on the embodiment, can be moved. A typical longitudinal extent of the lifting magnet 1 is about 25 to 100 centimeters, depending on lifting capacity and design. Preferred embodiments are a lifting magnet 1 with a longitudinal extent of about 50 centimeters and a lifting capacity of up to 1000 kilograms and a lifting magnet 1 with a longitudinal extent of about 100 centimeters and a lifting capacity of up to 2000 kilograms (safety factor 3). The lifting magnet 1 has a housing 3 with a housing cover 30, Gehäusestimwänden 34b and two contact elements 35. The housing 3 is preferably made of non-magnetic material, in particular metal or plastic and surrounds a magnetic rotor 20 and a magnetic stator 10 (s. Fig. 6 ). The housing cover 30 is of U-shaped cross-sectional shape and overlaps with lateral profile legs rotor 20 and stator 10 from above. The flat planes Profile legs extend substantially to the lower end of the stator 10, where the abutment elements 35 are mounted. The housing cover 30 has rounded top edges 32, between which a flat top surface 33 extends, the latter connecting the two profile legs. The housing 3 is preferably detachably fastened via screw connections 31 on the lifting magnet 1, in particular on the stator 10. The top surface 33 has threaded holes 33a, which serve to attach a suspension 5 of the lifting magnet 1 (s. Fig. 8 ). At front end surfaces of the stator 10 frame 34 are screwed with central recess 34a. The housing cover 30 surrounds these frames 34, wherein the frame 34 and the housing cover 30 are preferably welded firmly. At the upper cross-connection of the frame 34 upwardly projecting nubs or engagement elements 39 a are mounted, which in corresponding recesses 39 b of the housing cover 30 (s. Fig. 6 ) engage when the cover 30 is slipped over the frame 34, whereby the frame 34 are positively locked in the longitudinal direction in the housing cover 30 for welding. These engagement elements 39a thus serve as a positioning aid for the welding process. The housing cover 30 and the frame 34 welded thereto are then slipped over the stator 10 with a trough 36 (see below) and firmly screwed to the stator 10 and to the housing control walls 34b. The Gehäusestimwand 34 b, to which the protective cover 4 adjoins acts as a flange for the protective cover 4, by means of which the protective cover 4 is screwed to the housing 3 and the stator.

An das kastenförmige Gehäuse 3 schliesst sich stirnseitig an die Gehäusestimwand 34b ein Drehantrieb 40 an. Der Drehantrieb 40 ist hydraulisch, braucht also keine elektrischen Zuleitungen und ist von einer Schutzabdeckung 4 umgeben. Die Schutzabdeckung 4 ist U-förmig mit einem Bodenelement 43 und zwei davon abstehenden Profilschenkeln 44, 45 und umgreift den Drehantrieb 40 von unten. Die Schutzabdeckung 4 schliesst sich an die Gehäusestimwand 34b an und erstreckt sich in Längsrichtung bis Ă¼ber den Drehantrieb 40 hinaus. Die Profilschenkel 44, 45 erstrecken sich mit ihren freien Endabschnitt bis Ă¼ber den Drehantrieb 40 nach oben. Damit umgibt bzw. Ă¼bergreift die Schutzabdeckung 4 den Drehantrieb 40 schĂ¼tzend vor Schlägen aus allen Richtungen, insbesondere von unten und der Seite (links, rechts in Fig. 1).On the box-shaped housing 3, a rotary drive 40 is connected to the end face of the housing wall 34b. The rotary drive 40 is hydraulic, so needs no electrical leads and is surrounded by a protective cover 4. The protective cover 4 is U-shaped with a bottom element 43 and two projecting profile legs 44, 45 and surrounds the rotary drive 40 from below. The protective cover 4 adjoins the housing limiting wall 34b and extends longitudinally beyond the rotary drive 40. The profile legs 44, 45 extend with their free end portion to above the rotary drive 40 upwards. The protective cover 4 thus surrounds or overlaps the rotary drive 40 in a protective manner against impacts from all directions, in particular from below and the side (left, right in FIG Fig. 1 ).

An der stirnseitigen Ă–ffnung der Schutzabdeckung 4 ist eine Strebe 46 angebracht, welche die beiden oberen Ecken der freistehenden Endabschnitte der Profilschenkel 44, 45 verbindet. Diese Strebe 46 bietet weiteren Schutz fĂ¼r den Drehantrieb 40 und stabilisiert die Schutzabdeckung 4 mechanisch. Die Strebe 46 ist in Längsrichtung und nach oben abgerundet.At the frontal opening of the protective cover 4, a strut 46 is mounted, which the two upper corners of the freestanding end portions of the profile legs 44, 45th combines. This strut 46 provides further protection for the rotary drive 40 and stabilizes the protective cover 4 mechanically. The strut 46 is rounded in the longitudinal direction and upwards.

In einer alternativen AusfĂ¼hrungsform ist die die Schutzabdeckung stirnseitig und/oder oben vollständig geschlossen. In einer Weiterbildung umgibt die Schutzabdeckung 4 den Drehantrieb 40 also vollständig bzw. vollflächig. Diese Ausbildungen schĂ¼tzen den Drehantrieb 40 besser, sind allerdings schwerer.In an alternative embodiment, the protective cover is completely closed at the front and / or at the top. In a development, the protective cover 4 surrounds the rotary drive 40 completely or completely. These designs protect the rotary drive 40 better, but are heavier.

Die AusfĂ¼hrungsform mit offener Stirnseite gemäss Figs. 1, 2 weist auf einer Drehachse 42 des Drehantriebs 40 ein drehfest angebrachtes Anzeigeelement 47 in Form eines Zeigers auf. Dieser Zeiger 47 ist von einem Benutzer des Geräts 1 von aussen durch die offene Stirnseite der Schutzabdeckung 4 sichtbar und zeigt die momentane relative Anordnung zwischen Stator 10 und Rotor 20 an. Der Zeiger 47 dient also als Drehpositionsanzeige des Rotors 20. Die Drehpositionsanzeige kann auch eine Skala umfassen, Ă¼ber welche der Zeiger 47 wischt oder auf welche der Zeiger 47 anzeigt, was das Ablesen der aktuellen Drehposition erleichtert.The embodiment with open end according to Figs. 1, 2 has on a rotational axis 42 of the rotary drive 40 a rotatably mounted display element 47 in the form of a pointer. This pointer 47 is visible from the outside by a user of the device 1 through the open end of the protective cover 4 and indicates the instantaneous relative arrangement between the stator 10 and rotor 20 at. The pointer 47 thus serves as a rotational position indicator of the rotor 20. The rotational position indicator may also include a scale over which the pointer 47 wipes or to which the pointer 47 indicates, which facilitates the reading of the current rotational position.

Wie aus den Figs. 1, 2 ersichtlich, sind die Anlageelemente 35, welche quer zur Längsrichtung beabstandet sind, mit einer Vielzahl von sich gitterartig kreuzenden Nuten strukturiert. Diese Profilierung erhöht die Anlagestabilität der Nutzlast am Anlageelement 35. Eine solche Profilierung ist optional und insbesondere dann vorteilhaft, wenn die Nutzlast staubig ist oder kieselähnliche Verunreinigungen auf der Aussenseite aufweist. Dank dieser Profilierung können besagte Verunreinigungen in Ritzen der Profilierung verlagert werden. Der unerwĂ¼nschte Luftspalt zwischen Nutzlast und Anlageelement 35 auf Grund der Verunreinigung wird dadurch vermindert und die magnetische Nutzlast kann näher an den Wirkkreis treten, wodurch die Leistung des Hebemagneten 1 besser ausgenutzt wird.Like from the Figs. 1, 2 As can be seen, the abutment elements 35, which are spaced transversely to the longitudinal direction, are structured with a plurality of lattice-like intersecting grooves. This profiling increases the investment stability of the payload on the contact element 35. Such profiling is optional and particularly advantageous if the payload is dusty or has pebble-like contaminants on the outside. Thanks to this profiling, said impurities can be displaced in grooves of the profiling. The unwanted air gap between payload and contact element 35 due to the contamination is thereby reduced and the magnetic payload can come closer to the active circuit, whereby the performance of the lifting magnet 1 is better utilized.

In einer anderen bevorzugten AusfĂ¼hrungsform sind glatte Anlageelemente 35 vorgesehen. Das Anlageelement 35 kann aus Hartmaterial wie Stahl, vorzugweise aus ferromagnetischem Material gefertigt sein.In another preferred embodiment, smooth abutment elements 35 are provided. The abutment member 35 may be made of hard material such as steel, preferably ferromagnetic material.

Zudem kann das Anlageelement mit einer Dämpfschicht, bspw. aus Gummi, Ă¼berzogen sein. Es ist denkbar, profilierte Gummiprofile an der Anlagefläche anzubringen. Die Dämpfschicht wirkt vorteilhaft auf die Anlagestabilität und reduziert die Lärmemission bei der Lastaufnahme. Wie aus Fig. 6 ersichtlich ist, sind die Anlageelemente 35 fest mit dem Stator 10 verschraubt. Eine Abdeckung 35b verschliesst den Spalt zwischen den beiden Anlageelemente 35 derart, dass eine längsverlaufende Vertiefung 35c in der nach unten gerichteten Anlagefläche, welche durch die Anlageelemente 35 aufgespannt wird, entsteht. Dies stabilisiert die Anlage der Nutzlast und lässt diese im Mittelbreich näher an die Magneteinheit 10, 20 treten, womit eine wirkende Kraft aufgrund des magnetischen Wirkkreises vergrössert ist.In addition, the contact element can be coated with a damping layer, for example of rubber. It is conceivable to attach profiled rubber profiles to the contact surface. The damping layer has an advantageous effect on the stability of the system and reduces the noise emission during load absorption. How out Fig. 6 it can be seen, the contact elements 35 are bolted to the stator 10. A cover 35b closes the gap between the two Plant elements 35 such that a longitudinal recess 35c in the downwardly directed contact surface, which is spanned by the contact elements 35, is formed. This stabilizes the installation of the payload and allows it to come closer to the magnet unit 10, 20 in the middle region, whereby an acting force due to the magnetic circuit is increased.

Figuren 3 und 4 zeigen den Hebemagneten 1 gemäss Figs. 1, 2, wobei in Fig. 3 Ă¼bersichtshalber die Gehäuseabdeckung 30 und in Fig. 4 weiter auch noch der Drehantrieb 40 weggelassen sind. FIGS. 3 and 4 show the lifting magnet 1 according Figs. 1, 2 , where in Fig. 3 For the sake of clarity, the housing cover 30 and in Fig. 4 further also the rotary drive 40 are omitted.

In Fig. 3 ist die seitliche Aussenfläche des Stators 10 sichtbar. Der Stator 10 erstreckt sich vom Anlageelement 35 im Wesentlichen Ă¼ber die gesamte Breite bzw. Tiefe des Hebemagneten 1 parallel zu den Profilschenkel der Gehäuseabdeckung 30 nach oben und verjĂ¼ngt sich im Bereich, in welchem der Rotor 20 angeordnet ist (s. auch Fig. 6). Im unteren Teil des Stators 10 sind Gewindelöcher 13 fĂ¼r die Schraubverbindungen 31 zur Befestigung der Abdeckung 30 vorgesehen. Im unteren Teil des Stators 10, im Bereich der Schraubverbindungen 31, schmiegt sich die Abdeckung 30 abschnittsweise parallel verlaufend an den Stator 10 an.In Fig. 3 the lateral outer surface of the stator 10 is visible. The stator 10 extends upwardly from the abutment element 35 substantially over the entire width or depth of the lifting magnet 1 parallel to the profile legs of the housing cover 30 and tapers in the region in which the rotor 20 is arranged (see also FIG Fig. 6 ). In the lower part of the stator 10 threaded holes 13 are provided for the screw 31 for fixing the cover 30. In the lower part of the stator 10, in the region of the screw connections 31, the cover 30 fits snugly in sections against the stator 10.

Oben auf dem Stator 10 ist eine Wanne 36 angebracht, welche vorzugsweise auf dem Stator 10 befestigbar, insbesondere festschraubbar ist und sich Ă¼ber die gesamte Länge des Stators 10 und die Breite des Hebemagneten 1 erstreckt. An den seitlich nach oben stehenden Wänden der Wanne 36, welche im Wesentlichen senkrecht und parallel zu den Profilschenkeln der Abdeckung 30 verlaufen, sind Befestigungslöcher 38 fĂ¼r Schraubverbindungen mit Muttern vorgesehen. In der Wanne 36 sind in Längsrichtung in regelmässigen Abständen zwischen den Befestigungslöcher 38 quer verlaufende Rippen 37 angebracht, welche die Querschnittsform der Wanne 36 ausfĂ¼llen, die Wanne 36 somit segmentieren und damit den gesamten Hebemagneten 1 mechanisch versteifen und stabilisieren. Wie aus Fig. 6 ersichtlich ist, weist die Wanne 36 ähnliche Rundungen wie die Gehäuseabdeckung 30 auf. Zudem ist in Fig. 6 ersichtlich, dass die Wanne 36 im Bodenbereich Ausnehmungen 36a aufweist, in welche korrespondierende oder entsprechende Noppen der Rippen 37 eingreifen. Diese dienen der Positionierung der Rippen 37 in der Wanne 36, bevor die Rippen 37 und die Wanne 36 verschweisst werden.On top of the stator 10, a trough 36 is mounted, which is preferably fastened to the stator 10, in particular festschraubbar and extends over the entire length of the stator 10 and the width of the lifting magnet 1. At the laterally upstanding walls of the tub 36, which extend substantially perpendicular and parallel to the profile legs of the cover 30, mounting holes 38 are provided for screw with nuts. In the trough 36, transversely extending ribs 37 are provided in the longitudinal direction at regular intervals between the mounting holes 38, which fill the cross-sectional shape of the trough 36, thus segmenting the trough 36 and thus mechanically stiffening and stabilizing the entire lifting magnet 1. How out Fig. 6 can be seen, the trough 36 has similar curves as the housing cover 30. Moreover, in Fig. 6 it can be seen that the trough 36 has recesses 36a in the bottom area, in which corresponding or corresponding nubs of the ribs 37 engage. These serve to position the ribs 37 in the tub 36 before the ribs 37 and the tub 36 are welded.

Figur 4 zeigt, dass der Drehantrieb 40 direkt auf eine Welle 22 des Stators 10 geschoben ist. Diese direkte Kopplung erlaubt eine einfache und robuste Bauweise. FIG. 4 shows that the rotary drive 40 is pushed directly onto a shaft 22 of the stator 10. This direct coupling allows a simple and robust construction.

Figur 5 zeigt einen Längsquerschnitt mittig durch den Hebemagneten 1. Es ist im unteren Bereich ein erstes permanentmagnetisches Element 11, welche fest im Stator 10 angeordnet ist (s. Fig. 6) erkennbar. Senkrecht darĂ¼ber befindet sich ein zweites permanentmagnetisches Element 21 des Rotors 20. Die beiden permanentmagnetischen Elemente 11, 21 sind quaderförmig, erstrecken sich im Wesentlichen Ă¼ber die gesamte Länge des Stators 10 bzw. Rotors 20 und sind von gleicher Bauweise. Anhand von Fig. 5 und Fig. 6 ist erkennbar, dass der Rotor 20 im oberen Bereich des Stators 10 angeordnet ist, wo er drehbar gelagert ist. Der Rotor 20 erstreckt sich im Stator 10 im Wesentlichen Ă¼ber dessen gesamte Länge. FIG. 5 shows a longitudinal cross section in the middle by the lifting magnet 1. It is in the lower Area a first permanent magnetic element 11 which is fixedly arranged in the stator 10 (s. Fig. 6 ) recognizable. Vertically above it is a second permanent magnetic element 21 of the rotor 20. The two permanent magnetic elements 11, 21 are cuboidal, extend substantially over the entire length of the stator 10 and rotor 20 and are of the same construction. Based on Fig. 5 and Fig. 6 it can be seen that the rotor 20 is arranged in the upper region of the stator 10, where it is rotatably mounted. The rotor 20 extends in the stator 10 substantially over its entire length.

In Fig. 5 ist zudem dargestellt, wie die Welle 22 des Rotors 20 in den Drehantrieb 40 eingreift, wobei eine Achse 42 des Drehantriebs mit der Achse der Welle 22 Ă¼bereinstimmt.In Fig. 5 is also shown how the shaft 22 of the rotor 20 engages in the rotary drive 40, wherein an axis 42 of the rotary drive coincides with the axis of the shaft 22.

In Figur 6 (B-B-Schnitt, s. Fig. 5) ist erkennbar, dass das erste permanentmagnetische Element 11 hochkant mittig im Stator 10 fixiert ist. Und sich das zweite permanentmagnetische Element 21 direkt oberhalb befindet. Der Stator 10 besteht im Wesentlichen aus zwei Hälften, welche den Rotor 20 von je einer Seite umgeben, wobei diese Hälften Ausnehmungen aufweisen, in welche der Rotor 20 eingreift. Der Stator 10 ist so ausgebildet, dass er den Rotor 20 noch oben sich verjĂ¼ngend und einen dreiecksartigen Querschnitt bildend Ă¼berragt und nach unten den Rotor 20 weiter als nach oben Ă¼berragend zwei FĂ¼sse bereitstellt, welche die Anlageelemente 35 und die Abdeckung 35b aufweisen. Der Stator 10 und der Rotor 20 sind aus magnetischen, insbesondere ferromagnetischem Material und bilden mit den Magneten 11, 21 den magnetischen Wirkkreis, welcher je nach relativer Stellung der beiden Magneten eine magnetische Kraft zur Aufnahme der Last am Anlageelement zur VerfĂ¼gung stellt (Aufnahmeposition) oder die magnetische Kraft die Last freigebend reduziert (Freigabeposition).In FIG. 6 (BB cut, s. Fig. 5 ) it can be seen that the first permanent-magnetic element 11 is fixed in the center of the stator 10. And the second permanent magnetic element 21 is located directly above. The stator 10 essentially consists of two halves, which surround the rotor 20 on each side, said halves having recesses into which the rotor 20 engages. The stator 10 is designed such that it projects the rotor 20 still tapering above and forming a triangular cross-section and down the rotor 20 more than upwardly projecting two feet provides, the abutment elements 35 and the cover 35b. The stator 10 and the rotor 20 are made of magnetic, in particular ferromagnetic material and form with the magnets 11, 21, the magnetic circuit, which provides a magnetic force for receiving the load on the contact element depending on the relative position of the two magnets (recording position) or the magnetic force releasably reduces the load (release position).

Figur 7 zeigt einen Querschnitt durch einen Endabschnitt des Hebemagneten 1 (A-A-Schnitt, s. Fig. 5) FIG. 7 shows a cross section through an end portion of the lifting magnet 1 (AA section, s. Fig. 5 )

Auf Grund der Anordnung des zweiten permanentmagnetischen Elements 21 Ă¼ber dem ersten permanentmagnetischen Element 11 ist der Drehantrieb 40 in Abstand zu Anlageelement 35 angeordnet. Durch dieses Versetzen des Drehantriebs 40 nach oben entsteht ein Freiraum 15 unterhalb des Drehantriebs 40. Dieser Freiraum 15 erstreckt sich unterhalb der Schutzabdeckung 4 von der Gehäusestimwand 34b nach aussen und Ă¼ber die Breit oder Tiefe des Hebemagneten 1. Wie insbesondere aus Fig. 5 erkennbar ist, verläuft die Schutzabdeckung von der Gehäusestirnwand 34b weg schräg nach oben. Dieser Freiraum ist also etwa 5 bis 25 Zentimeter hoch und so breit oder tief wie der Lasthebemagnet 1. Die Verlagerung des Drehantriebs 40 nach oben, d.h. weg vom Erdboden, wenn der Hebemagnet 1 in Betrieb ist, schĂ¼tzt den Drehantrieb 40 zusätzlich vor Schlägen.Due to the arrangement of the second permanent-magnetic element 21 over the first permanent-magnetic element 11, the rotary drive 40 is arranged at a distance from the contact element 35. This clearance of the rotary drive 40 upwards creates a free space 15 below the rotary drive 40. This free space 15 extends below the protective cover 4 from the housing wall 34b to the outside and the width or depth of the lifting magnet 1. As in particular from Fig. 5 can be seen, the protective cover extends away from the housing end wall 34b obliquely upward. This Free space is therefore about 5 to 25 centimeters high and as wide or deep as the lifting magnet 1. The displacement of the rotary drive 40 upwards, ie away from the ground, when the lifting magnet 1 is in operation, protects the rotary actuator 40 in addition to punches.

Figur 8 zeigt eine Hebemagneteinheit 2 mit zwei Hebemagneten 1, welche Ă¼ber ein Tragelement 4 verbunden sind. Die Hebemagneten 1 sind einzeln Ă¼ber Platten 51, welche auf den Deckflächen 33 der Gehäuse 3 der Hebemagneten 1 angeschraubt sind, und eine gelenkige Aufhängung 5 mit dem Tragelement 4 verbunden. Die Aufhängungen 5 sind durch einen Schlitz 4a durch das Tragelement 4 gefĂ¼hrt und oberhalb formschlĂ¼ssig arretierbar. Durch diese Art der Aufhängung ist eine Distanz in Längsrichtung des Tragelements 4 zwischen den Hebemagneten 1 wählbar und einstellbar. Ăœber ein Kopplungselement 4b kann das Tragelement 4 mit einem Kabel oder Baggerarm oder Dergleichen gekoppelt werden. Zu illustrativen Zwecken ist eine magnetische Nutzlast 6, ein Doppel-T-Träger, dargestellt. BEZUGSZEICHENLISTE 1 Hebemagnet2 Hebemagneteinheit 33a Gewindelöcher 34 Rahmen 3 Gehäuse 34a Ausnehmung 4 Tragelement 34b Gehäusestirnwand 4a Schlitz 35 Anlageelement 4b Kopplungselement 35b Abdeckung 5 Aufhängung 35c Vertiefung 6 Nutzlast 36 Wanne 10 Stator 36a Ausnehmung 11 erstes permanentmagn. Element 37 Rippen 38 Befestigungslöcher 13 Gewindelöcher 39a Noppen 15 Freiraum 39b Ausnehmung 20 Rotor 40 Drehantrieb 21 zweites permanentmagn. Element 42 Achse von 40 43 Schutzabdeckung 22 Achse von 20 44, 45 Profilschenkel 30 Gehäuseabdeckung 46 Strebe 31 Schraubverbindung 47 Anzeigeelement 32 Gebogene Kante 33 Deckfläche FIG. 8 shows a lifting magnet unit 2 with two lifting magnets 1, which are connected via a support member 4. The lifting magnets 1 are individually connected via plates 51 which are screwed onto the top surfaces 33 of the housing 3 of the lifting magnet 1, and an articulated suspension 5 to the support member 4. The suspensions 5 are guided through a slot 4 a through the support element 4 and above positively locked. By this type of suspension, a distance in the longitudinal direction of the support member 4 between the lifting magnet 1 is selectable and adjustable. Via a coupling element 4b, the support element 4 can be coupled with a cable or excavator arm or the like. For illustrative purposes, a payload magnetic 6, a double T-bar, is shown. LIST OF REFERENCE NUMBERS 1 Lifting magnet2 lifting magnet unit 33a threaded holes 34 frame 3 casing 34a recess 4 supporting member 34b Housing end wall 4a slot 35 contact element 4b coupling element 35b cover 5 suspension 35c deepening 6 payload 36 tub 10 stator 36a recess 11 first permanentmagn. element 37 ribs 38 mounting holes 13 threaded holes 39a burl 15 free space 39b recess 20 rotor 40 rotary drive 21 second permanent magnet. element 42 Axis of 40 43 protective cover 22 Axis of 20 44, 45 profile leg 30 housing cover 46 strut 31 screw 47 display element 32 Curved edge 33 cover surface

Claims (14)

  1. Load-lifting magnet (1) for the force-fitted uptake of a magnetic load comprising: at least one stator (10) having a first permanently magnetic element (11), at least one stator (10) associated to the rotor (20) having a second permanently magnetic element (21) and at least one docking element (35) for taking up the load, whereby the at least one rotor (20) is rotatable by means of a rotary drive (40) relative to the stator (10) from an uptake position in which a magnetic force for the uptake of the load at the docking element (35) is provided by the first and second permanently magnetic element (21) into a release position, in which the magnetic force is load-releasingly reduced, characterized in that, the first permanently magnetic element (11) of the stators (10) connects to the second permanently magnetic element (21) of the rotor (20) in the main direction of the action of the magnetic force onto the load and lies between the second permanently magnetic element (21) of the rotor (20) and the docking element (35).
  2. Load-lifting magnet (1) according to claim 1, characterized in that, the rotary drive (40) is a hydraulic rotary drive (40).
  3. Load-lifting magnet (1) according to claim 1 or 2, characterized in that, the load-lifting magnet (1) can be operated without current and without lifting cylinders.
  4. Load-lifting magnet (1) according to one of the claims 1 to 3, characterized in that, a first axis (42) of the rotary drive (40) connects to a second axis (22) of the rotors (20) in axial direction and the rotary drive (40) is preferably directly mounted on the second axis (42).
  5. Load-lifting magnet (1) according to one of the claims 1 to 4, characterized in that, the rotary drive (40) connects to the rotor (20) shifted with respect to the stator (10) in longitudinal direction of the load-lifting magnet (1), such that in the longitudinal direction of the stator (10) in direction of the rotary drive (40), in the region below the rotary drive (40) towards the plane of the docking element (35), a clearance (15) exists across preferably an entire depth or breadth of the load-lifting magnet (1).
  6. Load-lifting magnet (1) according to one of the claims 1 to 5, characterized in that the rotor (20), the stator (10) and also preferably the docking element (35) are of the same length in longitudinal direction of the load-lifting magnet (1).
  7. Load-lifting magnet (1) according to one of the claims 1 to 6, characterized in that, the rotary drive (40) is surrounded by a protective covering (4), which protects the rotary drive (40) against impacts from below, whereby preferably the protective covering (4) encloses the rotary drive (40) from below and is formed into a tapered shape towards the top in longitudinal direction of the load-lifting magnet (1).
  8. Load-lifting magnet (1) according to one of the claims 1 to 7, characterized in that, the stator (10) is rotatable by 180 degrees relative to the rotor (20).
  9. Load-lifting magnet (1) according to one of the claims 1 to 8, characterized in that, the load-lifting magnet (1) exhibits a casing (30) constituted by the rotor (20) and stator (10) around the magnet unit (10, 20).
  10. Load-lifting magnet (1) according to claim 9, characterized in that, the casing (30) exhibits a preferably tub-shaped reinforcing element (36) in the region above the rotor (20) on the far side of the docking element (35), whereby this tub (36) is preferably reinforced by means of ribs (37) arranged within the tub (36).
  11. Load-lifting magnet unit comprising a plurality of load-lifting magnets (1) according to one of the claims 1 to 10, characterized in that, the load-lifting magnets (1) are connected across at least one bar- or surface-like bearing element (4).
  12. Load-lifting magnet unit according to claim 11, characterized in that, the load-lifting magnets (1) are rotatably fixed to the at least one bearing element.
  13. Load-lifting magnet unit according to one of the claims 11 or 12, characterized in that, two load-lifting magnets (1) fixed to a bearing element by means of a suspension device are comprised, whereby the suspension device is configured to rotate the road-lifting magnets (1) around a vertical direction.
  14. Use of a load-lifting magnet (1) according to one of the claims 1 to 10 or a load-lifting magnet unit according to one of the claims 11 to 13 for the taking up of a magnetic load and, after an eventual movement of the load-lifting magnet (1) including the load, for the subsequent release of the load.
EP13152564.4A 2013-01-24 2013-01-24 Load-lifting magnet with rotary drive Active EP2759508B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13152564.4A EP2759508B1 (en) 2013-01-24 2013-01-24 Load-lifting magnet with rotary drive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13152564.4A EP2759508B1 (en) 2013-01-24 2013-01-24 Load-lifting magnet with rotary drive

Publications (2)

Publication Number Publication Date
EP2759508A1 EP2759508A1 (en) 2014-07-30
EP2759508B1 true EP2759508B1 (en) 2015-10-14

Family

ID=47681692

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13152564.4A Active EP2759508B1 (en) 2013-01-24 2013-01-24 Load-lifting magnet with rotary drive

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EP (1) EP2759508B1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1213962A (en) 1969-03-06 1970-11-25 Eriez Mfg Company Turn-off permanent magnet
KR20030086562A (en) * 2003-10-24 2003-11-10 ́˜ˆí•´ê¸ˆ Apparatus for switching adsorptive magnetic power for magnetic adsorber
US8977398B2 (en) * 2011-04-29 2015-03-10 Sarcos Lc Multi-degree of freedom torso support for a robotic agile lift system
EP2532615A1 (en) * 2011-06-08 2012-12-12 Starmag AG Lifting magnet with cylinder/piston actuator

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