Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
  • B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
  • B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
  • B66D5/24—Operating devices
  • B66D5/30—Operating devices electrical
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
  • B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
  • B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
  • B66D5/06—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with radial effect
  • B66D5/08—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with radial effect embodying blocks or shoes
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
  • F16D51/16—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis
  • F16D51/18—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D59/00—Self-acting brakes, e.g. coming into operation at a predetermined speed
  • F16D59/02—Self-acting brakes, e.g. coming into operation at a predetermined speed spring-loaded and adapted to be released by mechanical, fluid, or electromagnetic means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D2121/00—Type of actuator operation force
  • F16D2121/18—Electric or magnetic
  • F16D2121/20—Electric or magnetic using electromagnets
  • F16D2121/22—Electric or magnetic using electromagnets for releasing a normally applied brake

Definitions

• the invention relates to a safety brake for hoist drives with a traction sheave, in particular for passenger and goods lifts.
• the object of the invention is to provide a safety brake for hoist drives with a traction sheave, which allows a minimization of the construction volume and the use of materials and thus a reduction in the amount of work involved in the manufacture of hoist drives while increasing the reliability of the brake. According to the invention, this object is achieved by a safety brake with the features specified in claim 1.
• the safety brake according to the invention is therefore characterized by the following features: it is designed as an electromechanical inner shoe brake with at least one brake shoe; the brake shoe has two ends and is mounted with one of these ends at a fixed pivot point inside the traction sheave (or the end shield of the electric motor used to drive the traction sheave); there is a fixed point inside the traction sheave opposite the other end of the brake shoe; at least two compression springs are arranged between the fixed point and the other end of the brake shoe, by means of which the brake shoe is pressed against a braking surface inside the traction sheave (or the end shield of the electric motor used to drive the traction sheave); the brake shoe is located in the working area of an electromagnet arranged inside the traction sheave; the electromagnet counteracts the at least one compression spring and is designed such that it overcomes its force when the current flows and pulls the brake shoe away from the braking surface. The brake shoe is held in the working position as long as current flows through the electromagnet.
• the electromagnet preferably has a magnet coil in the form of a ring coil.
• the electromagnet preferably also has a magnetic yoke (5) for which components of the hoist drive, preferably the A-side end shield, are used.
• the magnetic yoke is preferably circular, flattened laterally between the poles of the electromagnet and provided with a U-shaped recess. Due to the lateral flattening, the magnetic resistance in the magnetic circuit is specifically increased at these points to influence the field.
• the U-shaped recess serves to receive the preferably annular magnet coil of the electromagnet.
• the magnet coil is preferably held by a plate and completely covered by this.
• a compensation coil can also be provided, which is used for targeted. Field influence of the solenoid serves. It is intended to compensate for the magnetic fluxes inside the machine (e.g. bearings).
• the compensation coil can be connected in series with the magnetic coil. The electrical coupling between the magnetic coil and the compensation coil can, however, also take place in another way.
• the safety brake according to the invention is further preferably designed as a two-shoe brake, two brake shoes being provided diametrically opposite one another in the interior of the traction sheave. Both brake shoes can be located in the working area of the same electric magnet and can be supported against the same fixed point by means of springs.
• a plurality of brake shoes can also be provided inside the traction sheave, each brake shoe (3) being assigned its own magnetic coil (4).
• the main advantages of the design according to the invention are the maximum safety of the braking process in the event of a power failure, the brake preferably being designed such that even if there are several brake shoes, only one brake shoe is used brakes the entire elevator safely and there is therefore a safety brake.
• FIG. 1 front view of a hoist drive with an electromechanical inner shoe safety brake a cutout on the traction sheave with a view of a magnet and a compensation coil of the brake mentioned, and
• Fig. 2 is a side view of the electromechanical
• the hoist drive shown in Fig. 1 consists essentially of an electric motor 12, a traction sheave 1 and a brake, which have a common, fixed, torque-free axis 13.
• the electric motor 12 is designed as an external rotor motor.
• the traction sheave 1 is flanged directly to the armature of the electric motor.
• Within the traction sheave 1 there are two pivot points 2 for the brake shoes 3 of the brake.
• An electromagnet consisting of a magnet coil 4, in the form of a ring coil, is attached to the magnetic yoke 5, which is also a component of the end shield of the hoist drive.
• the electromagnet is designed in such a way that it overcomes the pressure force of the compression springs 7 attached to the fixed point 6 when the current flows and pulls the brake shoes 3.
• the compression springs 7 press the brake shoes 3 against the braking surface within the traction sheave 1.
• the traction sheave 1 is used as a brake drum.
• the circular, magnetic yoke 5 is flattened laterally between the poles of the magnet coil 4 and provided with a U-shaped recess 8 for receiving the magnet coil 4.
• the magnet coil 4 is held by a plate 9 and completely covered.
• a compensation coil 10 which is connected in series with the magnet coil.
• the compensation coil 10 is used to specifically influence the magnetic coil 4 in the field.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Cage And Drive Apparatuses For Elevators (AREA)
• Braking Arrangements (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=4224059

Family Applications (1)

Country Status (5)

Cited By (3)

Families Citing this family (2)

Citations (7)

• 1992
  • 1992-07-08 CN CN 92109522 patent/CN1069463A/zh active Pending
  • 1992-07-08 AU AU21730/92A patent/AU2173092A/en not_active Abandoned
  • 1992-07-08 WO PCT/CH1992/000137 patent/WO1993001121A1/de unknown
  • 1992-07-08 MX MX9204005A patent/MX9204005A/es unknown
  • 1992-11-24 TW TW81109466A patent/TW208692B/zh active

Patent Citations (7)

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