Classifications

• • 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
  • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
  • H01F7/16—Rectilinearly-movable armatures
  • H01F7/1607—Armatures entering the winding

Definitions

• the invention relates to a device for emergency manual actuation in the case of switching magnets, the armature of which can be moved in the pole tube by the force of a spring arrangement into an end position and by magnetic field excitation against the spring force in a second end position, with an axially displaceable tension member which can be moved by means of a manual actuation device and has a driver interacting with the armature in order to move it against its spring force into its second end position.
• Devices of this type are used in so-called "pulling" switching magnets as a safety device which enables manual intervention in cases where, for example, the armature does not move against the attacking spring force due to failure of the magnetic field excitation or mechanical blockage despite magnetic field excitation.
• the possibility of being able to move the armature manually in such a case is particularly advantageous, for example, if the switching magnet in question is used in hydraulic systems for actuating a directional control valve for controlling the pressure oil supply, for example a press or a working cylinder, where it is to prevent danger, it is essential that the pressure oil supply can be stopped manually if necessary.
• the invention has for its object to provide a device for emergency manual operation, which is characterized by a simpler structure and reduced assembly costs compared to the known devices of this type.
• this object is achieved according to the invention in that the armature, the pole core, the spring arrangement, the tension member and the actuating device are combined to form a prefabricated structural unit which can be inserted into and from the inner, open end of the pole tube it is connectable.
• both the functional elements for the manual emergency operation and the spring arrangement acting on the armature are integrated in the pole core results on the one hand in a compact design with the smallest possible number of individual parts.
• the fact that the anchor interacting with the tension member also belongs to the prefabricated unit also gives the advantage of simplified assembly because the unit has to be inserted into the pole tube from only one open end.
• the structural unit can be designed in the form of a cartridge which can be inserted into the pole tube in such a way that the pole core closes the pole tube connected to it at its inner end.
• connection to the pole tube is particularly simple here if the pole core has an annular groove machined into its circumference and can be connected to the annular groove by crimping the end of the pole tube.
• the actuating device can have, as an actuator for the axial displacement movement of the tension member, a threaded bolt which interacts with an internal thread section of an axial bore in the pole core which forms a guide for the tension member.
• the emergency actuation can be carried out in a convenient and safe manner by manually turning the threaded bolt if it has a screw head which is accessible at the free end of the pole core and which, for example, can be provided with extensive knurling.
• the tension member is preferably designed as an integral extension of the threaded bolt, which extends beyond the inner end of the pole core into an axial bore formed in the armature.
• the extension of the threaded bolt forming the tension member which extends through a sealing arrangement located in the axial bore of the pole core and into the axial bore formed in the armature, has an outer diameter that is tapered relative to the adjacent part of the threaded bolt. It is thereby achieved that an emergency actuation can be easily accomplished even against high prevailing working pressures.
• the assembly is particularly simple if a flanged edge which is formed at the free end of the extension of the tension member is provided as a driver.
• Such shaping of the free end of the tension member is particularly easy to manufacture during assembly if the free end of the tension member has an axial blind bore and after the assembly of the individual parts of the cartridge-like unit, the mouth of the blind bore is deformed outwards as a flanged edge.
• FIG. 1 shows a longitudinal section of a switching magnet with an embodiment of the inventive device for emergency manual operation, the magnet winding being omitted
• FIG. 2 shows a longitudinal section corresponding to FIG. 1, but the armature of the switching magnet being drawn in its attracted position, which is approximated to the pole core,
• Fig. 3 is a partial longitudinal section of the designated in Fig. 2 with IM
• Fig. 4 shows a longitudinal section of the cartridge-like assembly consisting of pole core and armature and interacting individual parts, which is shown in Figs. 1 and 2 installed in the associated pole tube. 1 and 2, the essential parts of a switching magnet are shown, the magnet winding sitting on its pole tube 1 being omitted in the drawing.
• the magnet is of the so-called "pulling" type, ie its armature 3, which is pressed away from the pole core 7 into an end position by means of a spring arrangement 5, which is shown in FIG. 1, is countered when the magnet winding is excited the force of the spring arrangement 5 is used on the pole core 7, as shown in FIG. 2.
• the pole tube 1 is divided by a welding point 4 for magnetic decoupling.
• the armature 3 is connected to an actuating mandrel 1 3 via a spring ring 49, which is seated in an annular groove 9, which is formed in an axial bore 11 of the armature 3, see in particular FIG
• Actuating mandrel 1 3 also has an annular groove 35 for interaction with the spring ring 49 and extends away from the armature 3 beyond the adjacent end of the pole tube 1 and serves as an actuating element for a switching operation in question, for example for valve actuation in a hydraulic system.
• All the individual parts accommodated in the interior of the pole tube 1 form a prefabricable, cartridge-like structural unit, which is shown in FIG. 4 for itself.
• This cartridge is inserted from the open end 1 5 of the pole tube 1 into this so that the pole core 7 closes the pole tube 1 at the end 1 5.
• the connection between the pole tube 1 and the pole core 7 takes place by crimping the end 15 of the pole tube 1 into a circumferential annular groove 17 of the pole core 7.
• Another circumferential annular groove 19 in the pole core 7 takes an O-ring 21 for the seal between the pole core 7 and the pole tube 1 on.
• the cartridge shown in Fig. 4 contains in addition to the pole core 7, the armature 3, the actuating pin 1 3 attached to it and the spring arrangement 5 a device for emergency manual operation.
• This has a threaded bolt 23, the threaded portion 24 of which is screwed to an internal thread 25 in an axial bore 27 in the pole core 7 and which has a screw head 29 accessible at the end of the pole core 7, which is provided with knurling for manual rotary actuation.
• the threaded bolt 23 is extended on its side facing away from the screw head 29 by a tapered end section 31, which extends through a sealing arrangement 39, which is located in an enlarged section of the bore 27 of the pole core, into the axial bore 11 of the armature 3.
• the free end of the extension 31 extends through a local constriction 43, through which a first annular shoulder surface 41 facing the pole core 7 and a second annular shoulder surface 45 facing away from the pole core 7 are formed in the bore 11, the latter being best seen from FIG. 3 .
• the free end of the extension 31 has an end-side, coaxial blind bore 50, the mouth of which is flanged outwards to form a flanged edge 47. As can be seen from Figs.
• the flanged edge 47 forms a driver, which during an emergency operation, i.e. when unscrewing (upwards in the drawings) the screw bolt 23 comes into contact with the annular shoulder surface 45 of the local constriction 43 of the bore 11 of the armature 3 and pulls it against the force of the spring arrangement 5 on the pole core 7.
• This position of the individual parts is shown in Fig. 4.
• the length of the tension member is such that the end flanged edge 47 of the extension 31 is in such a positional relationship with the ring shoulder surface 45 that the normal working stroke of the anchor is when the screw bolt 23 is screwed in, i.e. when the manual override is not activated (FIGS. 1 to 3) 3 is possible without hindrance.
• the compression spring arrangement 5 is supported in the axial bore 11 of the armature 3 on the one hand on the annular shoulder surface 41 formed by the constriction 43 and facing the pole core 7, while the other end abuts on a sealing arrangement 39 in the pole core 7 Washer 51 is supported.

Landscapes

• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Electromagnets (AREA)
• Gear-Shifting Mechanisms (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7854628

Family Applications (1)

Country Status (6)

Families Citing this family (9)

Citations (6)

Family Cites Families (4)

• 1998
  • 1998-01-15 DE DE19801201A patent/DE19801201A1/de not_active Ceased
  • 1998-10-01 DE DE59804937T patent/DE59804937D1/de not_active Expired - Lifetime
  • 1998-10-01 US US09/600,300 patent/US6310530B1/en not_active Expired - Lifetime
  • 1998-10-01 EP EP98954316A patent/EP1048040B1/de not_active Expired - Lifetime
  • 1998-10-01 JP JP2000540548A patent/JP4170589B2/ja not_active Expired - Fee Related
  • 1998-10-01 WO PCT/EP1998/006259 patent/WO1999036926A1/de not_active Ceased
  • 1998-10-01 ES ES98954316T patent/ES2181293T3/es not_active Expired - Lifetime

Patent Citations (6)

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