US3658372A - Magnet yoke for lifting iron bars - Google Patents

Magnet yoke for lifting iron bars Download PDF

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Publication number
US3658372A
US3658372A US34815A US3658372DA US3658372A US 3658372 A US3658372 A US 3658372A US 34815 A US34815 A US 34815A US 3658372D A US3658372D A US 3658372DA US 3658372 A US3658372 A US 3658372A
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US
United States
Prior art keywords
shaft
rope pulley
magnet assembly
nut
screwthread
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.)
Expired - Lifetime
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US34815A
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English (en)
Inventor
Eigil Madsen
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.)
MAGNEMAG HAGOU AS
Original Assignee
H Nielsen and Son Maskinfabrik AS
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Publication of US3658372A publication Critical patent/US3658372A/en
Assigned to MAGNEMAG HAGOU A/S, reassignment MAGNEMAG HAGOU A/S, ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: H. NIELSEN & SON MASKINFABRIK A/S
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/20—Electromagnets; Actuators including electromagnets without armatures
    • H01F7/206—Electromagnets for lifting, handling or transporting of magnetic pieces or material

Definitions

  • the sliding sleeve has [56] Rem-"Ices Cited on its outer side a first screwthread section and a second UNITED STATES PATENTS screwthread section with screwthreads corresponding to the two rope pulley nuts. 3,486,784 12/1969 Ejlertsen ..2-94/65.5 3,237,718 3/1966 Pearson ..254/184 15 Claims, 5 Drawing Figures 5 33 32 30 10 n 12 l-1I MAGNET YOKE FOR LIFTING IRON BARS BACKGROUND OF THE INVENTION l.
  • Field of the Invention The invention relates to a magnet yoke for'lifting iron bars, for example sectional irons.
  • the said magnet yoke has a main flange and a foot flange interconnected by means of side lattices to form a'lattice girder beneath which are provided a number of long, narrow electromagnets carrying end pins at each of their ends, the said magnetsbeing by means of ropes or slings attached to the end pins suspended vertically displaceable'from spring suspension means mounted in the lattice girder and the magnets being rotatable by means of a shaft extending longitudinally of the lattice girder and supported in fixed bearings provided-in the said girder.
  • a serious drawback is that the individual spring suspension members with corresponding rope pulley and intermediate rope pulley occupy much space, the distance between the spring suspension member and the rope pulley being approximately equal to the distance between main flange and foot flange.
  • Another serious drawback is that with the use of uniform lengths of slings for the individual magnets of the magnet yoke the provision of the spring suspension members in the main flange of the known magnet yoke in volves that the main flange has to be adapted to receive the said members and to extend parallel to the foot flange; this involves at suspension of the magnet yoke in hoisting mechanism by its central part an undesired, comparatively high construction of the outer ends of the magnet yoke.
  • the object of the invention is to provide a magnet yoke of the kind referred to in the introductory partof the specification with a simple and cheap suspension of the magnets from the lattice girder.
  • a magnet yoke which according to the invention has the essential feature that the spring suspension means are provided on the shaft that is adapted to turn the magnets.
  • each sling may be passed from its magnet up for attachment to the corresponding spring suspension member and thus be brought into direct mechanical connection with the shaft for turning the magnets without use of any extra length of sling between the spring suspension member and the shaft.
  • the main flange may, dependent upon the number and location of the suspension points of the lattice girder in a hoisting apparatus be of a suitable embodiment, for example with a horizontal central flange and rectilinear downwardly sloping end flanges on either side of same. The result obtained is thus on the whole a simple and cheap suspension of the magnets from the lattice girder.
  • each spring suspension member has a divided rope pulley rotatable in relation to the shaft and resting on a sliding sleeve that is axially displaceable in relation to the shaft and acted upon by a pressure spring which is coaxial with the sleeve. The result obtained is a compact construction of the spring suspension member.
  • the rope pulley consists of a first and a second rope pulley nut located beside each other, spaced apart by means of a slide disc, and being rotata ble in relation to each other, with inside screwthreads of opposite hand having identical screwthread diameter and slope angle, the sliding sleeve cooperating with the rope pulley nuts having on its outer side a first and a second screwthread section with screwthreads corresponding to the first and the second rope pulley nut, respectively, the said first and second screwthread section being spaced apart.
  • the result obtained is a pure rotation of one rope pulley nut in relation to the shaft, caused by unwinding or winding of the sling length lying on the rope pulley nut through engagement of the inside oblique screwthreads of the rope pulley, and the corresponding screwthread section of the sliding sleeve will cause the said sleeve to perform a pure axial movement in relation to the shaft.
  • the other screwthread section of the sliding sleeve will by its axial movement be brought into engagement with the oblique screwthread of the other rope pulley nut, and the said screwthread will perform a pure rotation in the opposite direction of the rotation of the first mentioned rope pulley nut as the two rope pulley nuts and the two screwthread sections have screwthreads of opposite hand. Since the said screwthreads have slope angles of equal size, the rope pulley nuts will rotate by an equal amount to either side so that equal lengths of the suspended sling parts are unwound or wound.
  • An essential feature of a third embodiment of the magnet yoke according to the invention is that the slide disc is made of nylon with an embedded casting of molybdenum disulphide. The result obtained is a slide disc with substantial lubricating qualities so that the friction between the two rope pulley nuts which are rotatable in relation to each other is highly reduced.
  • An essential feature of a fourth embodiment of the magnet yoke according to the invention is that the slope angle is 45. This affords an adequate travelling of the sliding sleeve and identical efiiciency of movement in either direction.
  • a fifth embodiment of the magnet yoke according to the invention is that the first and the second rope pulley nuts are each provided with a groove known per se for a rope or sling, the bottom of the said grooves having each a distance from the central axis of the shaft approximately equal to the radius of the end pins of the individual magnets.
  • the result obtained is that the turning angle of the rope pulley nuts and consequently of the shaft is equal to the turning angle of the magnets, which simplifies the operation of the magnet yoke.
  • a further result obtained is that such parts of the slings as extend upwardly from the end pins of the magnets are parallel and may be passed through non-oblique guide tubes provided on, and at right angles to, the upper and undersides of the foot flange, which facilitates mounting of the guide tubes in the foot flange.
  • An essential feature of a sixth embodiment of the magnet yoke according to the invention is the provision of an axially displaceable spring ring between the sliding sleeve and the pressure spring, the said spring ring having a diameter and a ring width corresponding substantially to the diameter and the width of the solid cross-section of the pressure spring.
  • An essential feature of a seventh embodiment of the magnet yoke according to the invention is that between the shaft on one side and the sliding sleeve, the spring ring and the pressure spring on the other side there is provided a tubular hub attached to the shaft.
  • the outer surface of the said hub will constitute a bearing for the said three axially movable elements.
  • An essential feature of an eighth embodiment of the magnet yoke according to the invention is that the hub at the end where the rope pulley nuts are provided is provided with the stop flange, which by means of an intermediate slide disc rests against the end surface of the outennost rope pulley nut, that the hub at the other end has a stop ring, the outside end surface of which by means of a screwthread provided on the end of the hub is resting against a nut screwed on the said screwthread, the inside end surface of the said stop ring resting against the end of the pressure spring, which does not touch the spring ring, and that between the stop ring and the innermost rope pulley nut there is provided a tubular cover surrounding the pressure spring, By this means the elements of the spring suspension member are joined in axial direction, so that the rope pulley nuts cannot move in axial direction in relation to each other or in relation to the shaft.
  • An essential feature of a ninth embodiment of the magnet yoke according to the invention is that the bearings of the shaft are attached on top of the foot flange. The result obtained is an efficient support of the shaft and, since the latter is mounted on top of the foot flange and thus located inside the lattice girder, a substantial protection of the shaft against impact from outside.
  • An essential feature of a tenth embodiment of the magnet yoke according to the invention is that the shaft is mechanically connected with a driving motor, for example a gear motor, mounted at the central part of the lattice girder. Owing to this arrangement of the driving motor at the central part of the foot flange, there will only be low torques at both ends of the shaft, and as a result the pole shoe surfaces of the magnets will always be located in approximately the same plane.
  • a driving motor for example a gear motor
  • An essential feature of an eleventh embodiment of the magnet yoke according to the invention is that the driving motor is located above the shaft, attached to the foot flange by means of stiffeners. As the driving motor is arranged inside the lattice girder, the result obtained is a compact construction of the magnet yoke, the driving motor being simultaneously protected against impacts from outside.
  • An essential feature of a twelfth embodiment of the magnet yoke according to the invention is that the driving motor is mechanically connected with the shaft via a friction coupling mounted on same and provided with overload safety device. As a result, the driving motor is protected against overload due to lifting or turning of an iron bar or a similar load.
  • An essential feature of a thirteenth embodiment of the magnet yoke according to the invention is that at the central part of the foot flange there is provided an electric stop member to ensure that the maximum turning of the magnets does not exceed predetermined turning angles, more particularly i-90 in relation to a vertical plane.
  • the said stop member will stop the driving motor and consequently the shaft, if the maximum turning of the magnets exceeds the said angles, thus preventing that the turned iron bar on any further turning strikes against the sling parts between the end pins of the magnets and the shaft.
  • FIG. 1 is a sideview of an embodiment of a magnet yoke according to the invention with spring suspension means and electromagnets, and a sectional iron beam lifted by these.
  • FIG. 2 shows on an enlarged scale a section taken on the line II-II of FIG. I,
  • FIG. 3 is, on a still larger scale, a longitudinal section taken through a spring suspension member
  • FIG. 4 is a sideview of a sliding sleeve for the spring suspension member shown in FIG. 3, and
  • FIG. 5 is an endview of the sliding sleeve shown in FIG. 4.
  • FIG. 1 shows a magnet yoke having a lattice girder 1 con-- sisting of a main flange or upper flange 2 and a foot flange or lower flange 3 which are interconnected by means of two side lattices 4.
  • the main flange 2 consists of a U-shaped flange
  • the foot flange 3 consists of a square tube.
  • the lattice girder l is by means of a suspension part 5 suspended at its central part from a hoisting apparatus (not shown). Beneath and along the lattice girder I are suspended a number of long, narrow electromagnets 6 which as shown in FIGS.
  • the magnets 6 carry at each of their ends end pins 8, and by means of ropes or slings 9 attached to the said end pins the magnets are suspended vertically displaceable from spring suspension members 10.
  • the magnets 6, which are resilient in vertical direction, may each of them separately adjust themselves to a sectional iron beam that is not straight and be caused to lift approximately an equal weight.
  • the spring suspension members 10 are mounted on a shaft 11 which extends longitudinally of the lattice girder 1 and rests in fixed bearings 12 provided in same.
  • the shaft 11 is, in addition to carrying the magnets 6, adapted to turn these via the spring suspension members 10 and the slings 9.
  • the magnets 6 are connected, preferably in pairs, by springs I2a in order to dampen any vibrations of the magnets in relation to the lattice girder 1.
  • FIG. 3 shows a longitudinal section through a spring suspension member 10 which has a divided rope pulley I3, 14 that is rotatable in relation to the shaft 11.
  • the said rope pulley is carried by a sliding sleeve 15 which is axially displaceable in relation to the shaft 11 and acted upon by a pressure spring 16 which according to FIG. 3 is designed as a cylindrical pressure spring of round wire.
  • the pressure spring 16 is mounted coaxially with the sliding sleeve 15.
  • an axially displaceable spring ring 17 having a diameter and ring width substantially corresponding to the diameter and the width of the cross-section of the spring wire.
  • the divided rope pulley consists of a first rope pulley nut 13 and a second rope pulley nut 14 located side by side, rotatably in relation to each other.
  • a slide disc 18 between them.
  • the said slide disc is preferably made of nylon with an embedded casting of molybdenum disulphide, so that the slide disc provided has an exceptionally low coefficient of friction.
  • the two rope pulley nuts are provided with inside, opposite hand screwthreads having identical screwthread diameter and slope angle 5513, (FIG. 4).
  • the slope angles )9, and B are preferably 45.
  • Each rope pulley nut 13 and 14 has along its outer circumference a machined groove 19 and 20, respectively (FIG. 3), in which either end of the sling 9 is resting (not shown in FIG. 3).
  • the grooves 19 and 20 are of identical cross-section and in the identical distance from the central axis of the shaft 11.
  • the bottoms of the grooves 19 and 20 are spaced a distance apart preferably equal to the radius of the end pins 8 of the magnets 6.
  • FIG. 2 which shows a vertical section through the lattice girder I, each of the two sling parts passed upwards are resting in contact with its separate groove corresponding to an angle of embrace of abt.
  • the sliding sleeve 15 which is made of bronze, is represented in a sideview. On its outer side it has a first screwthread section 21 and a second screwthread section 22 corresponding to the screwthreads of the first rope pulley nut 13 and the second rope pulley nut 14.
  • the screwthread section 21 is, for example, left-hand cut
  • the screwthread section 22 is right-hand cut.
  • the screwthread sections 21 and 22 are spaced a distance a apart (FIGS. 3 and 4). The said distance a corresponds to the maximum axial displacement possible for the sliding sleeve 15 (to the left in FIG. 3), since the screwthread section 21 by further movement of the sliding sleeve 15 will strike against the opposite hand screwthread of the other rope pulley nut 14.
  • the sliding sleeve 15, the spring ring 17 and the pressure spring 16 are mounted on a tubular hub 23 which is attached to the shaft 11 by means of an axial tongue and groove (not shown).
  • a tubular hub 23 which is attached to the shaft 11 by means of an axial tongue and groove (not shown).
  • the said flange abuts through an intermediate slide disc 25 with the end surface of the outermost rope pulley nut 13.
  • the slide disc 25 is similarly as the slide disc 18 made of nylon with an embedded casting of molybdenum disulphide.
  • a stop ring 27 On the opposite end of the hub 23 is inserted a stop ring 27 the outside end surface of which rests'against a nut 26 screwed on an outer screwthread provided on the end of the hub and secured against working loose in suitable manner.
  • the inside end surface of the stop ring 27 is resting against such end of the pressure spring 16 as does not touch the spring ring 17.
  • a tubular cover 28 surrounding the pressure spring 16. Between the cover 28 and the rope pulley nut 14 is a slight clearance, for example ofO. 1-0.2 mm, to permit rotation of the rope pulley nut 14 in relation to the cover.
  • the sliding sleeve is on its inner side provided with a smooth bore 28a with an axial sliding groove 29 as will appear from FIG. 5.
  • a corresponding axial sliding groove and tongue (not shown in FIG. 3) provided in the hub 23 the sliding sleeve 15 may slide or be displaced on the hub 23, but not turn in relation to the hub.
  • the bearings 12 are as shown in FIGS. 1 and 2 attached on top of the foot flange 3.
  • the shaft'll is mechanii cally connectedwith the drivingmotor 30, for example a gear motor located above the shaft 11 and attached to the central part of the foot flange 3 by means of stiffeners 31.
  • the driving motor 30 is connected with the shaft 11 via a friction coupling 32 with overload safety device.
  • an electric stop member 33 is provided on the foot flange 3 at the central part of same.
  • the said stop member will stop the driving motor 30 and consequently the shaft 11 if the maximum turning of the magnets exceeds predetermined turning angles, preferably 190 in relation to a vertical plane.
  • the rope pulley nut 13 cannot be displaced axially, being guided laterally by the stop flange and the other rope pulley nut 14, the rope pulley nut cannot perform the helical right hand movement.
  • the said helical movement may be. divided, partly into a pure rotational movement, directed clockwise when the shaft 11 is viewed in the direction of the arrow 34, partly a pure rectilinear axial movement to the right in FIG. 3.
  • the tope pulley nut will therefore only perform the pure rotational movement, whereas the sliding sleeve 15, which by means of its screwthread section 21 is in engagement with the inner screwthread of the rope pulley nut, will perform the rectilinear axial movement a certain distance to the left.
  • the sliding sleeve 15 will thereby force the spring ring 17 to the left, so that the pressure spring 16 is compressed by an amount equal to the rectlininear axial movement.
  • the said screwthread section 22 will by its engagement withthe inside right-hand screwthread of the other rope pulley nut 14 cause the said rope pulley nut to perform a pure rotational; movement of the same magnitude, but counter to the Fotational direction of the first rope pulley nut, that is, counter clockwise if the shaft 11 is viewed in the direction of the arrow 3.4.
  • the second sling part which is attached to the rope pulley-nut I4, is located on the other side of the shaft 11 in relation'to the sling part belonging to the rope pulley nut 13, the second sling part will thus be located on the front of the shaft 11 shown in FIG. 3.
  • the rotational movement of the rope pulley nut 14 will therefore involve that the second sling part is unwound by the same amount as the first sling part belonging to the first rope pulley nut 13.
  • the two sling parts will be extended by an equal amount.
  • a magnet assembly for use in lifting iron bars comprism a lattice girder,
  • elongated flexible sling means having a pair of vertical legs extending between the connector means and .the electromagnets for supporting the electromagnets and for producing rotational movement of the electroniagnets upon rotation of the shaft,
  • said connector means including resilient means mounted on the shaft for urging both vertical legs of the. elongated flexible means upwardly to permit vertical displacement of the associated electromagnet means when subjected to downward forces.
  • each of the connector means includes a sliding sleeve axially movable on the shaft a divided rope pulley movably mounted on the sliding sleeve, and pressure spring coaxial with and acting upon the sleeve.
  • a magnet assembly as claimed in claim 3 having an antifriction disc 18 located between the rope pulley nuts, said antifriction disc being made of nylon with an embedded casting of molybdenum disulphide.
  • a magnet assembly as claimed in claim 7 wherein a tubular hub is attached to the shaft and located between the shaft 11 and, respectively, the sliding sleeve 15, the spring ring 17 and the pressure spring 16.
  • a magnet assembly as claimed in claim 8 characterized in that the hub 23 at the end where the rope pulley nuts l3, 14 are situated is provided with a stop flange 24, an intermediate antifriction disc 18 located between the stop flange and the end surface of the outermost rope pulley nut 13, the other end of the hub having a stop ring 27, a hub screwthread provided on the external surface of said other end of the hub, a nut 26 screwed on the hub screwthread, the inside end surface of the said stop ring 27 resting against the end of the pressure spring 16 which does not touch the spring ring 17, and a tubular cover 28 surrounding the pressure spring 23 and located between the stop ring 27 and the innermost rope pulley nut 14.
  • each of the connector means includes a sleeve rotationally fixed and axially movable on the shaft, a pair of rope pulley nuts mounted on the sleeve and a pressure spring coaxial with the shaft and biasing the sleeve in one direction, and threaded engagement means operable between the sleeve and the rope pulley nuts for moving the sleeve to compress the spring in response to opposite rotational movement of the rope pulley nuts.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
  • Load-Engaging Elements For Cranes (AREA)
US34815A 1969-05-23 1970-05-05 Magnet yoke for lifting iron bars Expired - Lifetime US3658372A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK281069AA DK120452B (da) 1969-05-23 1969-05-23 Magnetåg til løftning af jernstænger.

Publications (1)

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US3658372A true US3658372A (en) 1972-04-25

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US34815A Expired - Lifetime US3658372A (en) 1969-05-23 1970-05-05 Magnet yoke for lifting iron bars

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US (1) US3658372A (enrdf_load_stackoverflow)
JP (1) JPS4929659B1 (enrdf_load_stackoverflow)
DE (2) DE7016994U (enrdf_load_stackoverflow)
DK (1) DK120452B (enrdf_load_stackoverflow)
FR (1) FR2043629B3 (enrdf_load_stackoverflow)
GB (1) GB1304071A (enrdf_load_stackoverflow)
NL (1) NL7006746A (enrdf_load_stackoverflow)
SE (1) SE351834B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026592A (en) * 1975-11-14 1977-05-31 Morrison-Knudsen Company Inc. Electromagnetic lifting and handling device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113847053B (zh) * 2021-08-06 2023-08-25 中铁十九局集团第五工程有限公司 隧道渣斗

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3237718A (en) * 1964-05-13 1966-03-01 Ederer Corp Two-sided suspension system for staging
US3486784A (en) * 1966-11-02 1969-12-30 Nielsen & Son Maskinfab As H Magnet lifting yoke

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3237718A (en) * 1964-05-13 1966-03-01 Ederer Corp Two-sided suspension system for staging
US3486784A (en) * 1966-11-02 1969-12-30 Nielsen & Son Maskinfab As H Magnet lifting yoke

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026592A (en) * 1975-11-14 1977-05-31 Morrison-Knudsen Company Inc. Electromagnetic lifting and handling device

Also Published As

Publication number Publication date
SE351834B (enrdf_load_stackoverflow) 1972-12-11
NL7006746A (enrdf_load_stackoverflow) 1970-11-25
GB1304071A (enrdf_load_stackoverflow) 1973-01-24
FR2043629A7 (enrdf_load_stackoverflow) 1971-02-19
JPS4929659B1 (enrdf_load_stackoverflow) 1974-08-06
DE7016994U (de) 1972-05-31
FR2043629B3 (enrdf_load_stackoverflow) 1973-03-16
DE2022160A1 (de) 1970-11-26
DK120452B (da) 1971-06-01

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AS Assignment

Owner name: MAGNEMAG HAGOU A/S,, STATELESS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:H. NIELSEN & SON MASKINFABRIK A/S;REEL/FRAME:003854/0872

Effective date: 19810305

Owner name: MAGNEMAG HAGOU A/S, METERBUEN 6-12, DK-2740 SKOVLU

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:H. NIELSEN & SON MASKINFABRIK A/S;REEL/FRAME:003854/0872

Effective date: 19810305