Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
  • B66B9/00—Kinds or types of lifts in, or associated with, buildings or other structures
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
  • B66B7/00—Other common features of elevators
  • B66B7/06—Arrangements of ropes or cables
  • B66B7/10—Arrangements of ropes or cables for equalising rope or cable tension

Definitions

• the invention relates to a device for lifting loads with a lift car that can be displaced along a vertical guide and which is connected to counterweights via four traction means attached to each load pick-up point of the lift car, the traction means for moving the lift car and the counterweights each via a drive roller are drive-connected to a drive.
• a device for lifting loads is known from WO2016109158A1.
• the device has a lift car, with four traction means each attaching to a load pick-up point of the lift car.
• Each of the traction means connected to the elevator car at one end is guided over a rotationally driven drive roller and connected to a counterweight at the other end. With the aid of a drive assigned to the drive rollers, the elevator car can be displaced along a vertical direction.
• a sensor which detects the tilted position of the elevator car and controls the drives assigned to the drive rollers to compensate for the position. Especially with varying load distributions in the elevator car, this means a high level of control effort, which is also dependent on the functionality of the sensor, so that regular maintenance of the sensors is absolutely necessary. In addition, there is the problem that the drives are exposed to very different loads, especially with uneven load distribution of high loads within the elevator car and, depending on their load profiles, have very different service lives.
• the invention is therefore based on the object of proposing a device for lifting loads of the type described above, which enables operation that is gentle on the drives and low-maintenance on the one hand, even with high and unevenly distributed loads in the elevator car.
• the invention solves the problem in that two of the four drive rollers are connected to one another in a rotationally fixed manner via a common synchronous shaft that is drive-connected to an asynchronous motor as the drive, and that two counterweights are provided, each of which is connected to two separate synchronous shafts associated with traction means is.
• the two asynchronous motors are mechanically coupled to one another both via the elevator car and via the two counterweights. Any further mechanical coupling is therefore not necessary for synchronization.
• the invention is based on the consideration that the slip property of asynchronous motors with increasing load leads to a reduction in the speed of the rated speed and an increase in the torque of the asynchronous motors. If the load distribution in the elevator car is uneven, the increase in load not only affects one asynchronous motor, but also affects both asynchronous motors due to the mechanical coupling of the asynchronous motors. As a result of the slip property of the asynchronous motors and the mechanical coupling according to the invention, the asynchronous motors are synchronized, since their speeds or speeds vary.
• the synchronizer shafts run parallel to one another.
• the two drive rollers assigned to a common counterweight can lie in a common plane with the counterweight and the traction means assigned to these drive rollers.
• the elevator car runs between a first level in which the two drive rollers assigned to a first common counterweight run with the first counterweight and the traction means assigned to these drive rollers, and a second level in which the two drive rollers assigned to a second common counterweight running with the second counterweight and the traction means assigned to these drive rollers, can be displaced along the vertical direction, since the dimensions of the entire device are thereby essentially determined by the dimensions of the elevator car.
• those two traction means assigned to separate synchronizer shafts with the shortest distance from one another can be connected to the same counterweight.
• the two traction means assigned to a common counterweight are attached to opposite vertical legs of the common
• the device can be provided indoors but also outdoors.
• the device In the open air, in particular, the device is exposed to external influences such as wind and the like, which can cause undesired displacement of the counterweights.
• the counterweights In order to prevent a collision between the elevator car and the counterweights, it is proposed that the counterweights be secured against shifting along the direction of the pivot axis normal to the plane.
• the elevator car can be guided in a forced vertical guide. This can be achieved, for example, by assigning two vertically spaced guide roller pairs to a side wall of the elevator car, a vertical guide rail being arranged between the guide rollers of the respective guide roller pair for the guided displacement of the elevator car. This prevents the lift cabin from tilting. Naturally, more side walls can also have two pairs of guide rollers which are spaced apart from one another in the vertical direction.
• a device for lifting loads comprises a lift car 9 which is connected to two counterweights 5, 6 via four traction means 7, 8 each attaching to a load pick-up point 12.
• the traction means 7,8, for example Steel cables are used to move the elevator car 7 and the counterweights 5, 6 along a vertical direction 13 via drive rollers 14a, 14b, 14c, 14d.
• the drive roller 14a is non-rotatably connected to the drive roller 14b via the synchronizer shaft 3.
• the drive roller 14c is non-rotatably connected to the drive roller 14d via the synchronizer shaft 4.
• the synchronous shaft 3 is drive-connected to a first asynchronous motor 1 as a drive and the synchronous shaft 4 is connected to a second asynchronous motor 2.
• the drive rollers 14a, 14b, 14c, 14d can be connected to the asynchronous motors 1, 2 via the synchronous shafts 3, 4 and possibly via further gear units be connected.
• the asynchronous motors 1, 2 are preferably connected electrically in parallel and can thus be controlled together.
• two separate synchronous shafts 3, 4 - that is, synchronous shafts 3, 4, which are driven by the other asynchronous motor 1, 2 - associated traction means 7, 8 are attached to a common counterweight 5, 6, whereby the asynchronous motors 1, 2 both via the elevator car 9 and via the counterweights 5, 6 with the aid of the traction means 7, 8 guided via the drive rollers 14a, 14b, 14c, 14d.
• the mechanical coupling forces the asynchronous motors 1, 2 to synchronize their speeds or torques due to their slip properties, which results in an even load distribution between the two asynchronous motors 1, 2 without complex additional control technology, even if the elevator car 9 is unevenly loaded.
• the vertical guide 10 also enables the elevator car 9 to run synchronously when the elevator car 9 is displaced along the vertical direction 13 without any position sensors.
• a plurality of vertical guides 10, 11 can also be provided, which are arranged on opposite sides of the elevator car 9, in order to enable the elevator car 9 to run particularly smoothly.
• the drive rollers 14a, 14c assigned to the counterweight 5 can lie in a common plane 15 with the counterweight 5 and the traction means 7 assigned to the drive rollers 14a, 14c.
• the drive rollers 14b, 14d assigned to the counterweight 6 can also lie with the counterweight 6 and the traction means 8 assigned to the drive rollers 14b, 14d in a common plane, not shown, which runs parallel to the plane 15.
• those two separate synchronizer shafts 3, 4 associated traction means 7, 8 with the shortest distance from one another can be connected to the same counterweight 5, 6. Accordingly, the pulling device 7 assigned to the synchronizer shaft 3 is connected via the counterweight 5 to the pulling device 7 assigned to the synchronizing shaft 4 and the pulling device 8 assigned to the synchronizing shaft 3 is connected to the pulling device 8 assigned to the synchronizing shaft 4 via the counterweight 6 the plane 15 and the parallel plane, not shown, in which the counterweight 6 runs, are displaced along the vertical direction 13.
• a particularly effective mechanical coupling of the asynchronous motors 1, 2 results when the traction means 7, 8 assigned to a counterweight 5, 6 attach to opposite vertical legs 16 of the common counterweight 5, 6, since the load arm resulting between the legs 16 transmits the force favored between the traction means 7, 8, so that only small load differences between the asynchronous motors 1, 2 can lead to synchronization.
• the counterweights are advantageously mounted so as to be pivotable about a pivot axis which is normal to plane 15.
• the counterweights 5, 6 can be secured against shifting along the direction of the pivot axis normal to the plane 15. Such a securing can act, for example, on the vertical guide 10, 11 or take place via separate vertically tensioned safety ropes.
• Vertical guide rails 17, 18 can be provided as vertical guides 10, 11, along each of which two guide roller pairs 19, spaced from one another in the vertical direction 13, run with the guide rails 17, 18 between the guide rollers 20 of the respective guide roller pairs 19.
• the pairs of guide rollers 19 can be arranged on the outside of a side wall 21 of the elevator car 9.

Landscapes

• Engineering & Computer Science (AREA)
• Automation & Control Theory (AREA)
• Structural Engineering (AREA)
• Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
• Types And Forms Of Lifts (AREA)
• Cage And Drive Apparatuses For Elevators (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=74859631

Family Applications (1)

Country Status (3)

Citations (2)

Family Cites Families (2)

• 2020
  • 2020-05-26 AT AT601652020A patent/AT523854A1/de not_active Application Discontinuation
• 2021
  • 2021-02-25 EP EP21710391.0A patent/EP4157774B1/de active Active
  • 2021-02-25 WO PCT/AT2021/060064 patent/WO2021237256A1/de not_active Ceased

Patent Citations (2)

Also Published As

Similar Documents

Legal Events