EP3100289B1 - Magnet und verfahren zur handhabung von metallblechen - Google Patents

Magnet und verfahren zur handhabung von metallblechen Download PDF

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Publication number
EP3100289B1
EP3100289B1 EP15708853.5A EP15708853A EP3100289B1 EP 3100289 B1 EP3100289 B1 EP 3100289B1 EP 15708853 A EP15708853 A EP 15708853A EP 3100289 B1 EP3100289 B1 EP 3100289B1
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EP
European Patent Office
Prior art keywords
magnet
slide
cavity
section
magnetic flux
Prior art date
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Application number
EP15708853.5A
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English (en)
French (fr)
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EP3100289A1 (de
Inventor
Reijo NÄTTI
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.)
IXTUR Oy
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IXTUR Oy
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Publication date
Priority claimed from PCT/FI2015/050014 external-priority patent/WO2015114202A1/en
Application filed by IXTUR Oy filed Critical IXTUR Oy
Publication of EP3100289A1 publication Critical patent/EP3100289A1/de
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0231—Magnetic circuits with PM for power or force generation
    • H01F7/0252—PM holding devices
    • H01F7/0257—Lifting, pick-up magnetic objects
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0231—Magnetic circuits with PM for power or force generation
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0205—Magnetic circuits with PM in general
    • H01F7/0226—PM with variable field strength
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0231—Magnetic circuits with PM for power or force generation
    • H01F7/0252—PM holding devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/04—Means for releasing the attractive force

Definitions

  • the present invention relates to a magnet and to a method for handling metal sheets according to the preambles of the appended independent claims.
  • Magnets are used in many fields of technology to perform various operations, such as to control motion, to switch electrical circuits and to move objects.
  • a magnet is typically provided with a certain functionality to change its magnetic state.
  • a magnet may comprise, for example, a coil which produces a magnetic field that is dependent on the amount and the direction of the electric current supplied to the coil.
  • the coil may be used alone, or it can be combined with a permanent magnet, whereby the coil is used to increase or decrease the magnetic field produced by the permanent magnet.
  • a magnet may comprise a movable part, the position of which determines the magnetic state of the magnet.
  • the movable part which comprises a permanent magnet, is moved relative to a body of the magnet, for example, with a magnetic force produced by a coil that is arranged to encircle the movable part.
  • the magnet of the document WO 2012/160262 is a so-called bi-stable magnet, wherein the movable part, which comprises a permanent magnet, is arranged to be movable relative to a body of the magnet between two positions. In the first position, the movable part is in contact with the body, whereby the magnetic flux generated by the permanent magnet may be directed through the body to an object to be attached. In the second position, the movable part is separated from the body so that the flow of the magnetic flux in the body is significantly reduced and thus the holding force of the magnet is almost negligible.
  • the body of the magnet comprises a coil that is arranged around the movable part. The movable part is moved between the two positions by supplying a sufficient amount of electric current through the coil in a suitable direction.
  • a problem associated with the magnet of the document WO 2012/160262 relates to the bi-stability of the magnet.
  • the magnet can only be in either of its two states and the state of the magnet is changed by moving the movable part from one stable position to the other. Consequently, the holding force of the magnet that is dependent on the position of the movable part has only two fixed values. In other words, the holding force of the magnet of the document WO 2012/160262 cannot be adjusted, which reduces the applicability of the magnet.
  • Another problem associated with the magnet of the document WO 2012/160262 relates to the second position of the movable part, i.e. to the position wherein the movable part is not in contact with the body.
  • the second position of the movable part i.e. to the position wherein the movable part is not in contact with the body.
  • either electric current must constantly be supplied to the coil, or the magnet must be provided with springs or other suitable means to push the movable part towards the second position.
  • a disadvantage is the power consumption of the coil
  • a disadvantage is the complicated structure, which may easily be damaged, thus resulting in a malfunction of the magnet.
  • a typical magnet according to the invention comprises a body that comprises a first and a second section made of magnetic material for directing magnetic flux to an object to be attached, the first and the second section being separated and attached to a third section of the body, which third section is made of non-magnetic material, and a slide that comprises a permanent magnet, and a first and a second pole piece attached to opposite magnetic pole surfaces of the permanent magnet, the first and the second pole piece being made of magnetic material and the slide being arranged to be movable relative to the body in order to alter the path of the magnetic flux generated by the permanent magnet.
  • the first section comprises a hole in which the slide is movably arranged, which hole opens at a first end into a first cavity of the body and at a second end into a second cavity of the body, the bottom of the first cavity being defined at least partly by the second section, the first and the second cavity contain a medium, and the magnet comprises means for transferring the medium into and out of the first and the second cavity in order to move the slide.
  • the first and the second section of the body are separated by the third section, so that inside the magnet the flow of magnetic flux between the first and the second section is insignificant.
  • An object that is arranged in contact with both the first and the second section closes the magnetic circuit, so that magnetic flux can flow between the first and the second section through the object.
  • the position of the slide determines the amount of magnetic flux that can be conducted through the object.
  • the slide is movably arranged in the hole of the first section. This means that part of the slide is always inside the hole.
  • the slide is arranged to be movable in two opposite directions, which are parallel to the longitudinal direction of the hole. The slide is moved in a first direction when it is moved towards the first cavity and in a second direction when it is moved towards the second cavity. The slide is arranged in the hole in such a manner that the second pole piece is directed towards the bottom of the first cavity.
  • the slide is moved relative to the body by transferring medium into and out of the first and the second cavity.
  • the slide is moved in the first direction.
  • the slide is moved in the second direction.
  • the first and the second cavity can be connected together through the means for transferring the medium, whereby medium can be transferred between the first and the second cavity, i.e. from one cavity to the other.
  • the means for transferring the medium can be arranged to process the first and the second cavity separately from one another.
  • the means for transferring the medium can comprise a container for each cavity for receiving the medium that has been transferred out of the cavity.
  • the holding force of the magnet depends on the position of the slide.
  • the holding force is at its minimum when the slide is at a first position, in which the permanent magnet, and at least part of the first and the second pole piece are located inside the hole.
  • magnetic flux generated by the permanent magnet is short-circuited by the first section. This means that the magnetic flux flows from one pole piece to the other mainly through a portion of the first section that surrounds the hole. The magnetic circuit is thus closed by the first section.
  • the magnetic flux is mainly directed from one pole piece to the first section, and from the first section to the other pole piece in a direction, which is essentially perpendicular to a wall of the hole. If the slide that is at the first position is moved in the first or the second direction, the permanent magnet produces a counterforce that works against the moving force and tries to pull the slide back to the first position.
  • the holding force of the magnet is at its maximum when the slide is at a second position, in which the second pole piece is in contact with the bottom of the first cavity.
  • magnetic flux generated by the permanent magnet flows efficiently through an object that is in contact with the first and the second section. Magnetic flux flows between the permanent magnet and the object through the first pole piece and the first section, and through the second pole piece and the second section.
  • the second pole piece is located outside the hole, and at least part of the first pole piece is located inside the hole.
  • the permanent magnet is located outside the hole.
  • the magnetic flux is mainly directed between the first pole piece and the first section in a direction essentially perpendicular to the wall of the hole, and between the second pole piece and the bottom of the first cavity in a direction essentially perpendicular to the bottom wall.
  • the direction of the magnetic flux to/from the second pole piece is thus turned by about 90 degrees between the first and the second position of the slide.
  • the distance between the second pole piece and the second section is preferably less than 5 mm, less than 1 mm, or less than 0.1 mm.
  • the second pole piece is in contact with the portion of the second section that defines the bottom of the first cavity.
  • the holding force of the magnet can be changed by moving the slide between the first and the second position.
  • the position of the slide is steplessly adjustable by transferring medium into and out of the first and the second cavity. Because the slide can be moved continuously between the first and the second position, the holding force can be set at a desired value by positioning the slide at a suitable position.
  • the holding force can be increased by moving the slide in the first direction, i.e. towards the second position.
  • the holding force can be decreased by moving the slide in the second direction, i.e. towards the first position.
  • the sections of the body may have various forms and sizes.
  • the sections of the body can be formed of one or more parts.
  • the sections of the body can be arranged within each other in such a manner that the first section surrounds the third section, which surrounds the second section.
  • the third section can be a sleeve that is arranged around the second section that can be cylindrical.
  • the first and the second section of the body are made of magnetic material that is suitable for conducting magnetic flux. Magnetic material of the first and the second section is ferromagnetic material, such as iron, nickel, cobalt or their alloys.
  • the third section is made of non-magnetic material, which can be paramagnetic material, such as resin, brass or aluminium, or diamagnetic material, such as acid-proof steel or stainless steel.
  • the slide has a sandwich structure, wherein the permanent magnet is arranged between the first and the second pole piece.
  • the first and the second pole piece are attached to different poles of the permanent magnet and are made of magnetic material so that the magnetic flux generated by the permanent magnet may be conducted through them.
  • Magnetic material of the first and the second pole piece is ferromagnetic material, preferably iron.
  • the permanent magnet can be, for example, a neodymium magnet, an alnico magnet or a samarium-cobalt magnet.
  • the first and the second pole piece can be, for example, disc-shaped and have the same diameter.
  • the permanent magnet can be, for example, disc-shaped and have the same diameter as or smaller diameter than the first and the second pole piece.
  • the thickness of the permanent magnet is smaller than the thickness of the first pole piece and the thickness of the second pole piece. The use of thicker pole pieces prevents the magnetic flux from saturating.
  • the permanent magnet may consist of one or more magnet pieces arranged in one or more layers.
  • the permanent magnet can, for example, be formed of sector pieces arranged in one layer in such a manner that the same poles of the sector pieces are disposed on the same side of the permanent magnet.
  • the number of sector pieces can be, for example, 2, 3, 4-6, or 7-10.
  • the permanent magnet can alternatively be formed of magnet pieces arranged one on the other.
  • the magnet pieces can be arranged one on the other in such a manner that ferromagnetic discs are arranged between the magnet pieces and the different poles of the magnet pieces are arranged to face each other.
  • the slide and the hole are cylindrical.
  • the slide and the hole can, however, have other forms, such as rectangular.
  • the diameter of the slide is only slightly smaller than the diameter of the hole, whereby the wall of the hole can efficiently support the slide while it is moved between the first and the second position.
  • the diameter of the hole can be, for example, less than 10 mm, 10-50 mm, 50-200 mm or 200-500 mm.
  • the diameter of the slide can be, for example, less than 2 mm, less than 1 mm, less than 0.5 mm, less than 0.1 mm or 0.005-0.5 mm smaller than the diameter of the hole.
  • the thickness of the slide is preferably larger than the depth of the hole.
  • the thickness of the slide can be, for example, less than 3 mm, 3-5 mm, 5-10 mm, 10-100 mm or 100-500 mm.
  • the first and the second cavity may have various forms and volumes.
  • the first cavity is cylindrical and its diameter is at least equal to the diameter of the hole.
  • the bottom of the first cavity is defined partly or totally by the second section, whereas the wall of the first cavity may be defined partly or totally by the third section, or by some other section of the body.
  • the depth of the first cavity is smaller than the thickness of the slide, whereby the slide may extend, at its second position, from the bottom of the first cavity into the hole.
  • the magnet according to the invention is suitable for moving objects and can thus be used as a lifting magnet.
  • the magnet can be used, for example, as follows to move an object from one location to another. First, an attachment surface of the magnet is arranged in contact with an object in such a manner that the first and the second section are in contact with the object. Next, the holding force of the magnet is increased by moving the slide in the first direction until the magnet is attached to the object. And then, the object is moved with the magnet to a desired location, in which the magnet is detached from the object by moving the slide in the second direction until the object is detached from the magnet.
  • An advantage of the magnet according to the invention is that its holding force is steplessly adjustable and the holding force can be adjusted easily. Another advantage of the magnet is that it consumes very little energy for maintaining the holding force constant. Still another advantage of the magnet is that the slide can stay in place at the first and the second position even without the use of the medium, with the help of the magnetic field produced by the permanent magnet. When the slide is at the first or the second position, the magnet does not need any energy. Still another advantage of the magnet is its simple structure that makes the magnet very robust and reliable. Still another advantage of the magnet is that the demagnetization of the permanent magnet can be avoided by arranging the slide at its first position, when the magnet is not in use. Still another advantage of the magnet is that its holding force is minimal when the magnet is OFF, i.e. when the slide is at the first position.
  • the magnet comprises a sealing ring attached around the slide or attached to the wall of the hole.
  • the sealing ring divides the airtight space inside the body into two portions and prevents the medium from flowing between said portions.
  • the sealing ring makes it easier to create a sufficient pressure difference and enables moving the slide efficiently.
  • the sealing ring can be made of, for example, silicone, ethylenepropylene, polyurethane, nitrile-butadiene rubber or acetal plastics, or their compounds.
  • the sealing ring is attached to a groove in the first pole piece.
  • the sealing ring is attached to the first pole piece in such a position that the sealing ring stays inside the hole at all positions of the slide.
  • the slide comprises a cap attached on top of the first pole piece for holding the sealing ring in place.
  • the cap may comprise a groove in which the sealing ring is installed.
  • the groove is preferably located close to the first pole piece.
  • the groove may also be arranged to the cap and/or the first pole piece so that the sealing ring is hold in place between the cap and the first pole piece.
  • the cap can be made of magnetic or non-magnetic material.
  • the means for transferring the medium into and out of the first and the second cavity comprises a first and a second conduit integrated into the body, a first end of the first conduit being in communication with the first cavity and a first end of the second conduit being in communication with the second cavity.
  • Medium can be transferred into and out of the first and the second cavity through the first and the second conduit, respectively.
  • the first end of the first conduit is arranged to the bottom of the first cavity
  • the first end of the second conduit is arranged to the bottom of the second cavity.
  • Second ends of the conduits may be in communication with each other so that the medium that has been transferred out of one cavity can be transferred into the other cavity.
  • the magnet may comprise a plurality of first and second conduits. The number of the first and the second conduits can be, for example, 2-4, 5-10 or 10-30.
  • a second end of the first conduit and a second end of the second conduit open outside the magnet.
  • the first and the second conduit thus extend through the body.
  • the means for transferring the medium into and out of the first and the second cavity comprises a pneumatic or a hydraulic system coupled to the second end of the first conduit and the second end of the second conduit.
  • the means for transferring the medium into and out of the first and the second cavity comprises a pump coupled to the second end of the first and the second conduit.
  • the pump can be configured to transfer medium in two directions, whereby the medium can be transferred from the first cavity into the second cavity, and vice versa.
  • the means for transferring the medium into and out of the first and the second cavity may comprise two pumps, the first pump being coupled to the second end of the first conduit and the second pump being coupled to the second end of the second conduit.
  • the pump can be a hydraulic pump or a pneumatic pump, such as a piston pump, a screw pump or a gear pump. It is also possible to use an existing hydraulic or pneumatic system coupled to the second ends of the conduits for transferring the medium into and out of the cavities.
  • the means for transferring the medium into and out of the first and the second cavity comprises a first pipe coupled between the pump and the second end of the first conduit, and a second pipe coupled between the pump and the second end of the second conduit.
  • the medium is gas or liquid.
  • a suitable gas for the magnet is, for example, air.
  • Suitable liquids for the magnet are, for example, oil and water.
  • the liquid that is used also functions as a lubricant, reducing the friction between the slide and the wall of the hole.
  • the body comprises a fourth section that defines the wall and the bottom of the second cavity, the fourth section being made of non-magnetic material.
  • the fourth section is attached to the first section. Because the fourth section is made of non-magnetic material, the slide cannot attach to it.
  • Non-magnetic material of the fourth section can be paramagnetic material, such as aluminium or plastic, or diamagnetic material, such as acid-proof steel.
  • the magnet can be manufactured, for example, as follows. First, a circular groove is machined into a second end of a circular block of magnetic material, the circular groove extending from the second end towards the first end. Next, the circular groove is filled with non-magnetic liquid material, which is hardened into solid form, and a bore, which is concentric with the circular groove, is drilled into the block from its first end towards the second end. The diameter of the bore is at least the inner diameter, but less than the outer diameter of the circular groove. The sum of the depth of the bore and the depth of the circular groove is larger than the thickness of the circular block. Then, a conduit is drilled for the first cavity, and a slide is inserted to the bore.
  • a cover having a conduit for the second cavity and being made of non-magnetic material is attached to the first end of the block to cover the bore.
  • the inner part of the machined block corresponds to the second section
  • the outer part corresponds to the first section
  • the intermediate part corresponds to the third section
  • the cover corresponds to the fourth section.
  • the first section defines the second cavity of the body.
  • the magnet comprises a magnetic flux sensor configured to measure magnetic flux density in the first section, and means for determining the position of the slide based on the measured magnetic flux density.
  • a magnetic flux sensor it is meant a transducer that varies its output voltage and/or current in response to magnetic flux density. Since the path of the magnetic flux in the first section is dependent on the position of the slide, the position of the slide can be determined from the output voltage and/or current of the magnetic flux sensor.
  • the means for determining the position of the slide may comprise, for example, a comparator circuit for providing, as a response to the output voltage and/or current of the magnetic flux sensor, an output signal identifying whether the slide is at the first or the second position.
  • the magnetic flux sensor may also be configured to indicate the position of the slide directly as a binary output. The magnetic flux sensor may also be used to detect whether an object is attached to the magnet or not.
  • the magnetic flux sensor can be arranged inside the first section, or attached on its surface.
  • the magnetic flux sensor is arranged inside the portion of the first section that surrounds the hole.
  • the magnet may comprise a plurality of magnetic flux sensors, which are configured to measure magnetic flux densities in different spatial locations and/or directions.
  • the magnetic flux sensors can be configured to measure magnetic flux densities in orthogonal and/or opposite directions.
  • the number of magnetic flux sensors can be, for example, 2, 3, or more than 3.
  • the magnetic flux sensor is one of the following: a Hall sensor, an AMR magnetometer, a MEMS sensor or reed relay.
  • the slide comprises a guiding rod extending to a bore in the bottom of the first cavity.
  • the guiding rod which extends in the longitudinal direction of the hole, may be arranged to extend partly or completely through the slide.
  • the guiding rod is preferably dimensioned in such a manner that part of the guiding rod stays in the bore all the time.
  • the purpose of the guiding rod is to reduce the movement of the slide in other directions than the longitudinal direction of the hole.
  • the guiding rod is made of non-magnetic material, which can be paramagnetic material, such as resin, brass or aluminium, or diamagnetic material, such as acid-proof steel or stainless steel.
  • the magnet comprises a coil attached to the body, the coil being configured to generate a magnetic force that increases or decreases the holding force of the magnet depending on the direction of electric current that is supplied to the coil.
  • the coil is preferably arranged inside the third section in such a manner that the coil encircles the slide at least partly, when the slide is at the second position.
  • the coil is used to change the holding force of the magnet, when the slide is at its second position.
  • the magnet comprises means for supplying electric current to the coil.
  • the means for supplying electric current may comprise, for example, a battery that is connected to the coil via a control unit.
  • the control unit is configured to control the amount and the direction of electric current supplied to the coil.
  • the control unit may comprise one or more operating switches for using the magnet, and/or a wireless receiver for receiving control commands from a remote controller.
  • the control unit may also comprise one or more indicator lights for indicating the status of the magnet, and/or a wireless transmitter for transmitting the status information to the remote controller.
  • the coil is configured to generate a magnetic force for moving the slide towards the first or the second position depending on the direction of electric current that is supplied to the coil.
  • the position of the slide can be changed with an electric current pulse that has a certain duration, magnitude and polarity.
  • the duration and the magnitude of the electric current pulse that is needed to move the slide from the first position to the second position, and vice versa are highly dependent of the structure and the size of the magnet.
  • the polarity of the electric current pulse depends on the direction to which the slide needs to be moved. Typically, the duration of an electric current pulse is 30-300 ms.
  • the present invention also relates to a method for handling metal sheets with a magnet according to the invention.
  • a typical method according to the invention comprises placing the magnet according to the invention on an uppermost metal sheet of a stack of metal sheets, increasing the holding force of the magnet by moving the slide towards the uppermost metal sheet, lifting the magnet, and decreasing the holding force of the magnet by moving the slide away from the uppermost metal sheet until a predetermined number of metal sheets remains attached to the magnet.
  • An advantage of the method according to the invention is that it enables to lift a desired number of metal sheets from a stack of metal sheets. It also enables to detach metal sheets from the magnet one by one.
  • the method comprises, after the step of decreasing the holding force of the magnet, increasing again the holding force of the magnet by moving the slide towards the uppermost metal sheet. This ensures that the metal sheets remain attached to the magnet while the magnet with the predetermined number of metal sheets is moved from one location to another.
  • Fig. 1 illustrates a cross-sectional view of a magnet according to an embodiment of the invention.
  • the magnet 100 comprises a cylindrical body 101 that comprises at its one end an attachment surface 102, which is meant to be arranged in contact with an object to be attached.
  • the body 101 comprises a first and a second section 103, 104 made of magnetic material.
  • the first and the second section 103, 104 are attached together with a third section 105 of the body 101, which third section 105 is made of non-magnetic material.
  • the third section 105 has the form of a sleeve and is attached around the second section 104 that is cylindrical.
  • the first section 103 is attached around the third section 105.
  • the first section 103 comprises a hole 106 that opens at a first end into a first cavity 107 of the body 101 and at a second end into a second cavity 108 of the body 101.
  • the first and the second cavity 107, 108 are cylindrical and contain liquid.
  • the bottom of the first cavity 107 is defined by the second section 104, and the wall of the first cavity 107 is defined by the third section 105.
  • the bottom and the wall of the second cavity 108 are defined by a fourth section 109 of the body 101.
  • the fourth section 109 is made of non-magnetic material.
  • the magnet 100 comprises a slide 110 that is movably arranged in the hole 106 of the first section 103.
  • the slide 110 is cylindrical and comprises a permanent magnet 111 and a first and a second pole piece 112, 113 that are attached to opposite magnetic pole surfaces of the permanent magnet 111.
  • the second pole piece 113 is directed towards the bottom of the first cavity 107.
  • the slide 110 comprises a sealing ring 125 that is attached around the first pole piece 112.
  • the slide 110 comprises a guiding rod 114 that extends from the second pole piece 113 to a bore 115 in the bottom of the first cavity 107.
  • the guiding rod 114 and the bore 115 are dimensioned in such a manner that part of the guiding rod 114 stays in the bore 115 all the time.
  • the position of the slide 110 is changed by transferring liquid from one cavity to the other.
  • the magnet 100 comprises a first and a second conduit 116, 117 that are integrated into the body 101.
  • the first conduit 116 is used for transferring liquid into and out of the first cavity 107
  • the second conduit 117 is used for transferring liquid into and out of the second cavity 108.
  • the first and the second conduit 116, 117 are connected to a pump 118 with a first and a second pipe 119, 120, respectively.
  • the pump 118 liquid can be transferred from one cavity to the other so that the slide 110 is moved from one position to the other.
  • the position of the slide 110 is determined with a magnetic flux sensor 121 that is arranged inside the first section 103, close to the hole 106.
  • the magnet 100 comprises a coil 122 that is arranged to generate a magnetic force for increasing or decreasing the holding force of the magnet 100 depending on the direction of electric current that is supplied to the coil 122.
  • the coil 122 is arranged inside the third section 105 and partly around the first cavity 107.
  • the magnet 100 comprises a battery 123 that is connected via a control unit 124 to the coil 122.
  • the control unit 124 controls the amount and the direction of electric current supplied from the battery 123 to the coil 122.
  • Fig. 2 illustrates the magnetic field generated by the magnet of fig. 1 , when the slide 110 is at a position where the permanent magnet 111, and part of the first and the second pole piece 112, 113 are located inside the hole 106.
  • FIG. 3 illustrates the magnetic field generated by the magnet of fig. 1 , when the slide 110 is at a position where the second pole piece 113 is located outside the hole 106, and the permanent magnet 111 and the first pole piece 112 are located inside the hole 106.
  • Fig. 4 illustrates the magnetic field generated by the magnet of fig. 1 , when the slide 110 is at a position where the second pole piece 113 is in contact with the bottom of the first cavity 107.
  • the second pole piece 113 and the permanent magnet 111 are located outside the hole 106, and part of the first pole piece 112 is located inside the hole 106. Essentially all of the magnetic field lines pass from the first pole piece 112 to the second pole piece 113 through the first and the second section 103, 104, and through the metal sheet 200. At this position of the slide 110, the holding force is maximal, and therefore the magnet 100 is tightly attached to the metal sheet 200.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Electromagnets (AREA)

Claims (15)

  1. Magnet (100), umfassend:
    - einen Körper (101), der einen ersten und einen zweiten Abschnitt (103, 104), aus magnetischem Material gefertigt, umfasst, um magnetischen Fluss auf ein zu befestigendes Objekt (200) zu richten, wobei der erste und der zweite Abschnitt (103, 104) getrennt und an einem dritten Abschnitt (105) des Körpers (101) befestigt sind, wobei der dritte Abschnitt (105) aus nicht-magnetischem Material gefertigt ist und
    - ein Gleitstück (110), das einen Permanentmagneten (111) und ein erstes und ein zweites Polstück (112, 113) umfasst, die an entgegengesetzten Magnetpolflächen des Permanentmagneten (111) befestigt sind, wobei das erste und das zweite Polstück (112, 113) aus magnetischem Material gefertigt sind und das Gleitstück (110) eingerichtet ist, relativ zum Körper (101) beweglich sein, um den Weg des vom Permanentmagneten (111) erzeugten magnetischen Flusses zu verändern;
    dadurch gekennzeichnet, dass:
    - der erste Abschnitt (103) ein Loch (106) umfasst, in dem das Gleitstück (110) beweglich angeordnet ist, wobei das Loch (106) an einem ersten Ende in einen ersten Hohlraum (107) des Körpers (101) und an einem zweiten Ende in einen zweiten Hohlraum (108) des Körpers (101) mündet, wobei der Boden des ersten Hohlraums (107) zumindest teilweise durch den zweiten Abschnitt (104) definiert ist,
    - der erste und der zweite Hohlraum (107, 108) ein Medium enthalten und
    - der Magnet (100) ein Mittel (116, 117, 118, 119, 120) zum Übertragen des Mediums in den ersten und den zweiten Hohlraum (107, 108) hinein und aus dem ersten und zweiten Hohlraum heraus umfasst, um das Gleitstück (110) zu bewegen.
  2. Magnet nach Anspruch 1, dadurch gekennzeichnet, dass das Gleitstück (110) und das das Loch (106) zylindrisch sind.
  3. Magnet nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Magnet (100) einen Dichtungsring (125), der um das Gleitstück (110) herum angebracht ist oder an der Wand des Lochs (106) angebracht ist, umfasst.
  4. Magnet nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Mittel (116, 117, 118, 119, 120) zum Übertragen des Mediums in den ersten und den zweiten Hohlraum (107, 108) hinein und aus dem ersten und zweiten Hohlraum (107, 108) heraus eine in den Körper (101) integrierte erste und zweite Leitung (116, 117) umfasst, wobei ein erstes Ende der ersten Leitung (116) in Verbindung mit dem ersten Hohlraum (107) steht, und ein erstes Ende der zweiten Leitung (117) in Verbindung mit dem zweiten Hohlraum (108) steht.
  5. Magnet nach Anspruch 4, dadurch gekennzeichnet, dass ein zweites Ende der ersten Leitung (116) und ein zweites Ende der zweiten Leitung (117) sich außerhalb des Magneten (100) öffnen.
  6. Magnet nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass das Mittel (116, 117, 118, 119, 120) zum Übertragen des Mediums in den ersten und zweiten Hohlraum (107, 108) hinein und aus dem ersten und zweiten Hohlraum (107, 108) hinaus eine Pumpe (118) umfasst, die mit dem zweiten Ende der ersten und der zweiten Leitung (116, 117) gekoppelt ist.
  7. Magnet nach einem der vorgehenden Ansprüche, dadurch gekennzeichnet, dass das Medium ein Gas oder eine Flüssigkeit ist.
  8. Magnet nach einem der vorgehenden Ansprüche, dadurch gekennzeichnet, dass der Körper (101) einen vierten Abschnitt (109), der die Wand und den Boden des zweiten Hohlraums (108) festlegt, umfasst, wobei der vierte Abschnitt (109) aus nicht-magnetischem Material gefertigt ist.
  9. Magnet nach einem der vorgehenden Ansprüche, dadurch gekennzeichnet, dass der Magnet (100) umfasst:
    - einen magnetischen Flusssensor (121), eingerichtet um die magnetische Flussdichte in dem ersten Abschnitt (103) zu messen und
    - ein Mittel zum Bestimmen der Position des Gleitstücks (110) basierend auf der gemessenen magnetischen Flussdichte.
  10. Magnet nach Anspruch 9, dadurch gekennzeichnet, dass der magnetische Flusssensor (121) ein Hallsensor, ein AMR-Magnetometer, ein MEMS-Sensor oder ein Reed-Relais ist.
  11. Magnet nach einem der vorgehenden Ansprüche, dadurch gekennzeichnet, dass das Gleitstück (110) einen Führungsstab (114) umfasst, der sich zu einer Bohrung (115) in dem Boden des ersten Hohlraums (107) erstreckt.
  12. Magnet nach einem der vorgehenden Ansprüche, dadurch gekennzeichnet, dass der Magnet (100) eine Spule (122), die an dem Körper (101) befestigt ist, umfasst, wobei die Spule (122) eingerichtet ist, eine magnetische Kraft zu erzeugen, die die Haltekraft des Magneten (100), abhängig von der Stromrichtung, die an die Spule (122) angelegt wird, steigert oder verringert.
  13. Magnet nach Anspruch 12, dadurch gekennzeichnet, dass der Magnet (100) ein Mittel (123, 124) umfasst, um elektrischen Strom an die Spule (122) bereitzustellen.
  14. Verfahren zur Handhabung von Metallblechen, dadurch gekennzeichnet, dass das Verfahren umfasst:
    - Platzieren des Magneten (100) nach Anspruch 1 auf ein oberstes Metallblech von einem Stapel von Metallblechen
    - Erhöhen der Haltekraft des Magneten (100) durch Bewegen des Gleitstücks (110) in Richtung des obersten Metallblechs,
    - Hochheben des Magneten (100) und
    - Verringern der Haltekraft des Magneten (100) durch Bewegen des Gleitstücks (110) weg von dem obersten Metallblech, bis eine vorfestgelegte Anzahl an Metallblechen am Magneten (100) haftend verbleiben.
  15. Verfahren nach Anspruch 14, dadurch gekennzeichnet, dass das Verfahren nach dem Schritt des Verringerns der Haltekraft des Magneten (100) ein abermaliges Erhöhen der Haltekraft des Magneten (100) durch Bewegen des Gleitstücks (110) auf das oberste Metallblech hin umfasst.
EP15708853.5A 2014-01-30 2015-01-30 Magnet und verfahren zur handhabung von metallblechen Active EP3100289B1 (de)

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FI20145101A FI20145101L (fi) 2014-01-30 2014-01-30 Magneetti ja menetelmä metallilevyjen käsittelemiseksi
PCT/FI2015/050014 WO2015114202A1 (en) 2014-01-30 2015-01-12 Magnet
PCT/FI2015/050019 WO2015114203A1 (en) 2014-01-30 2015-01-14 Magnet and method for handling metal sheets
PCT/FI2015/050063 WO2015114220A1 (en) 2014-01-30 2015-01-30 Magnet and method for handling metal sheets

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US10903030B2 (en) 2017-04-27 2021-01-26 Magswitch Technology Worldwide Pty Ltd. Variable field magnetic couplers and methods for engaging a ferromagnetic workpiece
KR102550385B1 (ko) 2017-04-27 2023-06-30 마그스위치 테크놀러지 월드 와이드 피티와이 리미티드 센서 배치 및 자기 소거 성능 중 적어도 하나를 가지는 자기 커플링 디바이스
EP3746261B1 (de) 2018-01-29 2023-11-01 Magswitch Technology, Inc. Magnetische hebevorrichtung mit polschuhen mit voneinander beabstandeten vorsprüngen
EP3857575A4 (de) * 2018-10-24 2022-07-13 Magswitch Technology Worldwide Pty Ltd. Linear betätigte magnetkupplungsvorrichtung

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DE19951703C2 (de) * 1999-10-27 2003-07-31 Andreas Bellmann Abschaltbarer Dauermagnet mit bewegtem magnetischem Kolben
WO2012160262A1 (en) 2011-05-25 2012-11-29 Ixtur Oy Magnet, attaching device, attaching arrangement and method for attaching to an object
EP2465806B1 (de) * 2010-12-17 2013-11-27 TRUMPF Werkzeugmaschinen GmbH & Co. KG Magnetgreifer

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