EP2759508A1 - Aimant de levage de charge avec entraînement rotatif - Google Patents

Aimant de levage de charge avec entraînement rotatif Download PDF

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Publication number
EP2759508A1
EP2759508A1 EP20130152564 EP13152564A EP2759508A1 EP 2759508 A1 EP2759508 A1 EP 2759508A1 EP 20130152564 EP20130152564 EP 20130152564 EP 13152564 A EP13152564 A EP 13152564A EP 2759508 A1 EP2759508 A1 EP 2759508A1
Authority
EP
European Patent Office
Prior art keywords
lifting magnet
rotary drive
stator
rotor
lifting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20130152564
Other languages
German (de)
English (en)
Other versions
EP2759508B1 (fr
Inventor
René Sterchi
Bernhard Naef
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Starmag AG
Original Assignee
Starmag AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Starmag AG filed Critical Starmag AG
Priority to EP13152564.4A priority Critical patent/EP2759508B1/fr
Publication of EP2759508A1 publication Critical patent/EP2759508A1/fr
Application granted granted Critical
Publication of EP2759508B1 publication Critical patent/EP2759508B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-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
    • B66C1/04—Load-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 of the type mentioned 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.
  • 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.
  • 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.
  • the user 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.
  • the user must always be in the immediate vicinity of the lifting device for operating the lifting magnet, which is also a disadvantage.
  • 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.
  • 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.
  • 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 members 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)
EP13152564.4A 2013-01-24 2013-01-24 Aimant de levage de charge avec entraînement rotatif Active EP2759508B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13152564.4A EP2759508B1 (fr) 2013-01-24 2013-01-24 Aimant de levage de charge avec entraînement rotatif

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13152564.4A EP2759508B1 (fr) 2013-01-24 2013-01-24 Aimant de levage de charge avec entraînement rotatif

Publications (2)

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EP2759508A1 true EP2759508A1 (fr) 2014-07-30
EP2759508B1 EP2759508B1 (fr) 2015-10-14

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EP13152564.4A Active EP2759508B1 (fr) 2013-01-24 2013-01-24 Aimant de levage de charge avec entraînement rotatif

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Citations (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
WO2005040031A1 (fr) * 2003-10-24 2005-05-06 Hae-Kum Ye Aimant de levage
US20120277911A1 (en) * 2011-04-29 2012-11-01 Raytheon Company Variable Strength Magnetic End Effector For Lift Systems
EP2532615A1 (fr) * 2011-06-08 2012-12-12 Starmag AG Aimant de levage doté d'un actionneur de cylindre/piston

Patent Citations (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
WO2005040031A1 (fr) * 2003-10-24 2005-05-06 Hae-Kum Ye Aimant de levage
US20120277911A1 (en) * 2011-04-29 2012-11-01 Raytheon Company Variable Strength Magnetic End Effector For Lift Systems
EP2532615A1 (fr) * 2011-06-08 2012-12-12 Starmag AG Aimant de levage doté d'un actionneur de cylindre/piston

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Publication number Publication date
EP2759508B1 (fr) 2015-10-14

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