EP4157774A1 - Device for hoisting loads - Google Patents

Device for hoisting loads

Info

Publication number
EP4157774A1
EP4157774A1 EP21710391.0A EP21710391A EP4157774A1 EP 4157774 A1 EP4157774 A1 EP 4157774A1 EP 21710391 A EP21710391 A EP 21710391A EP 4157774 A1 EP4157774 A1 EP 4157774A1
Authority
EP
European Patent Office
Prior art keywords
drive
traction means
counterweights
counterweight
assigned
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.)
Granted
Application number
EP21710391.0A
Other languages
German (de)
French (fr)
Other versions
EP4157774C0 (en
EP4157774B1 (en
Inventor
Martin BEISSMANN
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.)
Mt Industrial Solutions & Co Kg GmbH
Original Assignee
Mt Industrial Solutions & Co GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mt Industrial Solutions & Co GmbH filed Critical Mt Industrial Solutions & Co GmbH
Publication of EP4157774A1 publication Critical patent/EP4157774A1/en
Application granted granted Critical
Publication of EP4157774C0 publication Critical patent/EP4157774C0/en
Publication of EP4157774B1 publication Critical patent/EP4157774B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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

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)

Abstract

The invention relates to a device for hoisting loads, having a lift car (9), which can be displaced along a vertical guide (10, 11) and is connected to counterweights (5, 6) via four traction means (7, 8), which are each fastened to a load-receiving point (12) of the lift car (9), the traction means (7, 8) being drive-connected to a drive in each case via a drive pulley (14a, 14b, 14c, 14d) in order to displace the lift car (9) and the counterweights (5, 6). According to the invention, in order to allow operation which protects the drives and requires little maintenance, even in the case of large loads distributed unevenly in the lift car, in each case two of the four drive pulleys (14a, 14b, 14c, 14d) are connected to one another for conjoint rotation via a common synchronous shaft (3, 4), which is drive-connected to an asynchronous motor (1, 2) as the drive, and two counterweights (5, 6) are provided, each of which is connected to two traction means (7, 8) assigned to separate synchronous shafts (3, 4).

Description

Vorrichtung zum Heben von Lasten Device for lifting loads
Technisches Gebiet Technical area
Die Erfindung bezieht sich auf eine Vorrichtung zum Heben von Lasten mit einer entlang einer Vertikalführung verlagerbaren Liftkabine, welche über vier an jeweils einem Lastaufnahmepunkt der Liftkabine befestigte Zugmittel mit Gegengewichten verbunden ist, wobei die Zugmittel zum Verlagern der Liftkabine und der Gegengewichte über je eine Antriebsrolle mit einem Antrieb antriebsverbunden sind. 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.
Stand der Technik State of the art
Aus der W02016109158A1 ist eine Vorrichtung zum Heben von Lasten bekannt. Die Vorrichtung weist eine Liftkabine auf, wobei vier Zugmittel an jeweils einem Lastaufnahmepunkt der Liftkabine ansetzen. Jedes der einerends mit der Liftkabine verbundenen Zugmittel ist über eine drehangetriebene Antriebsrolle geführt und anderends mit einem Gegengewicht verbunden. Mit Hilfe eines den Antriebsrollen zugeordnetes Antriebs kann die Liftkabine entlang einer Vertikalrichtung verlagert werden.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.
Um ein gleichmäßiges Anheben und Absenken der Liftkabine während des Gebrauchs zu gewährleisten, ist ein Sensor vorgesehen, der die Kipplage der Liftkabine detektiert und die den Antriebsrollen zugeordneten Antriebe zum Lageausgleich ansteuert. Vor allem bei variierenden Lastverteilungen in der Liftkabine bedeutet dies einen hohen Regelaufwand, der darüber hinaus von der Funktionstüchtigkeit des Sensors abhängig ist, sodass eine regelmäßige Wartung der Sensorik unbedingt erforderlich ist. Hinzu kommt das Problem, dass vor allem bei ungleichmäßiger Lastverteilung von hohen Lasten innerhalb der Liftkabine die Antriebe stark unterschiedlichen Belastungen ausgesetzt sind und in Abhängigkeit deren Belastungsprofilen stark unterschiedliche Standzeiten aufweisen. In order to ensure that the elevator car is raised and lowered evenly during use, a sensor is provided 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.
Darstellung der Erfindung Presentation of the invention
Der Erfindung liegt somit die Aufgabe zugrunde, eine Vorrichtung zum Heben von Lasten der eingangs geschilderten Art vorzuschlagen, die auch bei hohen und ungleich in der Liftkabine verteilten Lasten einerseits einen für die Antriebe schonenden und andererseits einen wartungsarmen Betrieb ermöglicht. 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.
Die Erfindung löst die gestellte Aufgabe dadurch, dass jeweils zwei der vier Antriebsrollen über eine gemeinsame, mit je einem Asynchronmotor als Antrieb antriebsverbundene, Synchronwelle drehfest miteinander verbunden sind und dass zwei Gegengewichte vorgesehen sind, von denen jedes mit zwei, gesonderten Synchronwellen zugeordneten, Zugmitteln verbunden ist. 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.
Zufolge dieser Maßnahmen sind die beiden Asynchronmotoren sowohl über die Liftkabine als auch über die beiden Gegengewichte miteinander mechanisch gekoppelt. Eine darüber hinaus gehende mechanische Kopplung ist daher nicht zur Synchronisation notwendig. Der Erfindung liegt dabei die Überlegung zugrunde, dass es durch die Schlupfeigenschaft von Asynchronmotoren mit steigender Belastung zu einer Drehzahlverringerung der Nenndrehzahl und zu einer Erhöhung des Drehmoments der Asynchronmotoren kommt. Kommt es nun zu einer ungleichen Lastverteilung in der Liftkabine, so wirkt sich die Lasterhöhung nicht nur auf einen Asynchronmotor aus, sondern durch die mechanische Kopplung der Asynchronmotoren auf beide Asynchronmotoren. Durch die Schlupfeigenschaft der Asynchronmotoren und die erfindungsgemäße mechanische Kopplung erfolgt demnach eine Synchronisation der Asynchronmotoren, da sich deren Drehzahlen bzw. As a result of these measures, 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.
Drehmomente aneinander anpassen, wodurch einerseits eine gleichmäßige Lastverteilung an den beiden Antrieben und andererseits mit Zusammenwirken der Vertikalführung ein Gleichlauf der Liftkabine beim Verlagern der Liftkabine entlang der Vertikalführung ohne etwaige Lagesensoren zum Erfassen der Kipplage der Liftkabine ermöglicht wird. Adapting the torques to one another, which on the one hand results in an even load distribution on the two drives and on the other hand with the interaction of the vertical guide a synchronism of the elevator car when moving the elevator car is made possible along the vertical guide without any position sensors to detect the tilt position of the lift car.
Um eine einfach zu bewerkstelligende mechanische Kopplung der Antriebe zu ermöglichen und den Antrieb dabei möglichst kompakt auszugestalten, wird vorgeschlagen, dass die Synchronwellen zueinander parallel verlaufen. Auf diese Weise können die beiden einem gemeinsamen Gegengewicht zugeordneten Antriebsrollen mit dem Gegengewicht und den diesen Antriebsrollen zugeordneten Zugmitteln in einer gemeinsamen Ebene liegen. In order to enable a mechanical coupling of the drives that is easy to achieve and to make the drive as compact as possible, it is proposed that the synchronizer shafts run parallel to one another. In this way, 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.
Grundsätzlich ist es vorteilhaft, wenn die Liftkabine zwischen einer ersten Ebene, in welcher die beiden einem ersten gemeinsamen Gegengewicht zugeordneten Antriebsrollen mit dem ersten Gegengewicht und den diesen Antriebsrollen zugeordneten Zugmitteln verlaufen, und einer zweiten Ebene, in welcher die beiden einem zweiten gemeinsamen Gegengewicht zugeordneten Antriebsrollen mit dem zweiten Gegengewicht und den diesen Antriebsrollen zugeordneten Zugmitteln verlaufen, entlang der Vertikalrichtung verlagert werden kann, da dadurch die Dimension der gesamtes Vorrichtung im Wesentlichen durch die Dimensionierung der Liftkabine bestimmt wird. Hierzu können jene zwei, gesonderten Synchronwellen zugeordneten, Zugmittel mit dem kürzesten Abstand zueinander mit dem gleichen Gegengewicht verbunden sein. In principle, it is advantageous if 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. For this purpose, those two traction means assigned to separate synchronizer shafts with the shortest distance from one another can be connected to the same counterweight.
Damit eine Synchronisierung der Asynchronmotoren auch bei geringen Belastungsunterschieden ermöglicht wird, empfiehlt es sich in einer besonders vorteilhaften Ausgestaltungsform der erfindungsgemäßen Vorrichtung, dass die beiden einem gemeinsamen Gegengewicht zugeordneten Zugmittel an jeweils gegenüberliegenden senkrechten Schenkeln des gemeinsamenIn order to enable synchronization of the asynchronous motors even with small differences in load, it is recommended in a particularly advantageous embodiment of the device according to the invention that the two traction means assigned to a common counterweight are attached to opposite vertical legs of the common
Gegengewichts ansetzen. Auf diese Weise ergibt sich zwischen den senkrechten Schenkeln des Gegengewichts ein Lasthebel, der eine Feinjustierung der Synchronisierung begünstigt. Eine besonders effektive Synchronisierung der Asynchronmotoren ergibt sich dabei, wenn die Gegengewichte um eine zur Ebene normal stehende Schwenkachse verschwenkbar angeordnet sind. Apply a counterweight. In this way there is a load lever between the vertical legs of the counterweight, which facilitates fine adjustment of the synchronization. A particularly effective synchronization of the asynchronous motors results when the Counterweights are arranged to be pivotable about a pivot axis which is normal to the plane.
Grundsätzlich kann die Vorrichtung in Innenräumen aber auch im Freien vorgesehen sein. Vor allem im Freien ist die Vorrichtung äußeren Einflüssen wie Wind und dergleichen ausgesetzt, der ein unerwünschtes Verlagern der Gegengewichte bedingen kann. Um daher einen Zusammenstoß zwischen Liftkabine und Gegengewichte zu verhindern, wird vorgeschlagen, dass die Gegengewichte gegen ein Verlagern entlang der Richtung der normal zur Ebene stehenden Schwenkachse gesichert sind. In principle, the device can be provided indoors but also outdoors. 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. 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.
Um bei ungleichmäßiger Lastverteilung in der Liftkabine nicht nur die Belastung gleichmäßig auf die Antriebe zu verteilen, sondern gleichzeitig eine gewünschte Ausrichtung der Liftkabine zu ermöglichen, ohne dabei eine aufwändige Regelung zu bedingen, kann die Liftkabine in einer Zwangsvertikalführung geführt sein. Dies kann beispielsweise dadurch erreicht werden, dass einer Seitenwand der Liftkabine zwei in Vertikalrichtung voneinander beabstandete Führungsrollenpaare zugeordnet sind, wobei zum geführten Verlagern der Liftkabine eine vertikale Führungsschiene zwischen den Führungsrollen des jeweiligen Führungsrollenpaares angeordnet ist. Dadurch wird ein Verkippen der Liftkabine verhindert. Naturgemäß können auch mehr Seitenwände zwei in Vertikalrichtung voneinander beabstandete Führungsrollenpaare aufweisen. In order not only to distribute the load evenly to the drives in the event of an uneven load distribution in the elevator car, but also to enable the elevator car to be aligned as required without requiring complex regulation, 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.
Kurze Beschreibung der Erfindung Brief description of the invention
In der Figur ist eine perspektivische Darstellung des Erfindungsgegenstands beispielsweise dargestellt. In the figure, a perspective view of the subject matter of the invention is shown, for example.
Weg zur Ausführung der Erfindung Way of carrying out the invention
Eine Vorrichtung zum Heben von Lasten umfasst eine Liftkabine 9, welche über vier an jeweils einen Lastaufnahmepunkt 12 ansetzende Zugmittel 7,8 mit zwei Gegengewichten 5, 6 verbunden ist. Die Zugmittel 7,8, beispielsweise Stahlseile, sind zum Verlagern der Liftkabine 7 und der Gegengewichte 5, 6 entlang einer Vertikalrichtung 13 über Antriebsrollen 14a, 14b, 14c, 14d geführt. Die Antriebsrolle 14a ist über die Synchronwelle 3 drehfest mir der Antriebsrolle 14b verbunden. Die Antriebsrolle 14c ist über die Synchronwelle 4 drehfest mir der Antriebsrolle 14d verbunden. Die Synchronwelle 3 ist dabei mit einem ersten Asynchronmotor 1 als Antrieb antriebsverbunden und die Synchronwelle 4 mit einem zweiten Asynchronmotor 2. Die Antriebsrollen 14a, 14b, 14c, 14d können über die Synchronwellen 3, 4 und gegebenenfalls über weitere Getriebeeinheiten mit den Asynchronmotoren 1, 2 verbunden sein. Vorzugsweise sind die Asynchronmotoren 1 , 2 elektrisch parallelgeschaltet und somit gemeinsam ansteuerbar. 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.
Erfindungsgemäß setzen jeweils zwei, gesonderten Synchronwellen 3, 4 - also Synchronwellen 3, 4, welche von dem jeweils anderen Asynchronmotor 1 , 2 angetrieben werden - zugeordneten, Zugmittel 7, 8 an ein gemeinsames Gegengewicht 5, 6 an, wodurch die Asynchronmotoren 1 , 2 sowohl über die Liftkabine 9, als auch über die Gegengewichte 5, 6 mithilfe der über die Antriebsrollen 14a, 14b, 14c, 14d geführten Zugmittel 7,8 miteinander mechanisch gekoppelt werden. Die mechanische Kopplung zwingt den Asynchronmotoren 1 , 2 aufgrund deren Schlupfeigenschaft eine Synchronisation deren Drehzahlen bzw. Drehmomente auf, wodurch es zu einer gleichmäßigen Belastungsverteilung ohne komplexe zusätzliche Regelungstechnik zwischen den beiden Asynchronmotoren 1, 2 kommt, auch wenn die Liftkabine 9 ungleichmäßig belastet wird. Durch die Vertikalführung 10 kann zudem ein Gleichlauf der Liftkabine 9 beim Verlagern der Liftkabine 9 entlang der Vertikalrichtung 13 ohne etwaige Lagesensoren ermöglicht werden. Naturgemäß können auch mehrere Vertikalführungen 10, 11 vorgesehen sein, die an gegenüberliegenden Seiten der Liftkabine 9 angeordnet sind, um einen besonders ruhigen Gleichlauf der Liftkabine 9 zu ermöglichen. According to the invention, 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. Naturally, 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.
Konstruktiv einfache Bedingungen ergeben sich, wenn die Synchronwellen 3, 4 parallel zueinander verlaufen. Die Antriebsrollen 14a, 14b, 14c, 14d können jeweils endabschnittsseitig an den Synchronwellen 3, 4 drehtest angeordnet sein. Constructively simple conditions arise when the synchronizer shafts 3, 4 run parallel to one another. The drive rollers 14a, 14b, 14c, 14d can each end portion side of the synchromesh shafts 3, 4 be arranged rotating test.
Um die Vorrichtung möglichst kompakt ausgestalten zu können, können die dem Gegengewicht 5 zugeordneten Antriebsrollen 14a, 14c mit dem Gegengewicht 5 und den den Antriebsrollen 14a, 14c zugeordneten Zugmitteln 7 in einer gemeinsamen Ebene 15 liegen. Auch die dem Gegengewicht 6 zugeordneten Antriebsrollen 14b, 14d können mit dem Gegengewicht 6 und den den Antriebsrollen 14b, 14d zugeordneten Zugmitteln 8 in einer gemeinsamen nicht eingezeichneten Ebene liegen, welche parallel zur Ebene 15 verläuft. In order to be able to make the device as compact as possible, 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.
Wie der Figur zu entnehmen ist, können jene zwei, gesonderten Synchronwellen 3, 4 zugeordneten, Zugmittel 7,8 mit dem kürzesten Abstand zueinander mit dem gleichen Gegengewicht 5,6 verbunden sein. Demnach ist das der Synchronwelle 3 zugeordnete Zugmittel 7 über das Gegengewicht 5 mit dem der Synchronwelle 4 zugeordneten Zugmittel 7 verbunden und das der Synchronwelle 3 zugeordnete Zugmittel 8 über das Gegengewicht 6 mit dem der Synchronwelle 4 zugeordneten Zugmittel 8. Auf diese Weise kann die Liftkabine zwischen der Ebene 15 und der nicht dargestellten parallelen Ebene, in der das Gegengewicht 6 verläuft, entlang der Vertikalrichtung 13 verlagert werden. As can be seen from the figure, 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.
Eine besonders effektive mechanische Kopplung der Asynchronmotoren 1, 2 ergibt sich, wenn die einem Gegengewicht 5,6 zugeordneten Zugmittel 7, 8 an jeweils gegenüberliegenden senkrechten Schenkeln 16 des gemeinsamen Gegengewichts 5,6 ansetzen, da der sich zwischen den Schenkeln 16 ergebende Lastarm die Kraftübertragung zwischen den Zugmitteln 7, 8 begünstigt, sodass auch nur geringe Belastungsunterschiede zwischen den Asynchronmotoren 1 , 2 zu einer Synchronisation führen können. Vorteilhafterweise sind die Gegengewichte hierzu um eine zur Ebene 15 normal stehende Schwenkachse verschwenkbar gelagert. Um eine Kollision zwischen den Gegengewichten 5, 6 und der Liftkabine 9 zu vermeiden, können die Gegengewichte 5, 6 gegen ein Verlagern entlang der Richtung der normal zur Ebene 15 stehenden Schwenkachse gesichert sein. Eine derartige Sicherung kann beispielsweise an der Vertikalführung 10, 11 angreifen oder über gesonderte vertikal gespannte Sicherungsseile erfolgen. 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. For this purpose, the counterweights are advantageously mounted so as to be pivotable about a pivot axis which is normal to plane 15. In order to avoid a collision between the counterweights 5, 6 and the elevator car 9, 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.
Als Vertikalführungen 10, 11 können vertikale Führungsschienen 17, 18 vorgesehen sein, entlang derer jeweils zwei in Vertikalrichtung 13 voneinander beabstandete Führungsrollenpaare 19 unter Zwischenlage der Führungsschienen 17, 18 zwischen den Führungsrollen 20 der jeweiligen Führungsrollenpaare 19 verlaufen. Die Führungsrollenpaare 19 können an der Außenseite einer Seitenwand 21 der Liftkabine 9 angeordnet sein. 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.

Claims

Patentansprüche Claims
1. Vorrichtung zum Heben von Lasten mit einer entlang einer Vertikalführung (10, 11) verlagerbaren Liftkabine (9), welche über vier an jeweils einem Lastaufnahmepunkt (12) der Liftkabine (9) befestigte Zugmittel (7,8) mit Gegengewichten (5,6) verbunden ist, wobei die Zugmittel (7,8) zum Verlagern der Liftkabine (9) und der Gegengewichte (5,6) über je eine Antriebsrolle (14a, 14b, 14c, 14d) mit einem Antrieb antriebsverbunden sind, dadurch gekennzeichnet, dass jeweils zwei der vier Antriebsrollen (14a, 14b, 14c, 14d) über eine gemeinsame, mit je einem Asynchronmotor (1,2) als Antrieb antriebsverbundene, Synchronwelle (3,4) drehfest miteinander verbunden sind und dass zwei Gegengewichte (5,6) vorgesehen sind, von denen jedes mit zwei, gesonderten Synchronwellen (3,4) zugeordneten, Zugmitteln (7,8) verbunden ist. 1. A device for lifting loads with a lift car (9) which can be displaced along a vertical guide (10, 11) and which has four traction means (7, 8) with counterweights (5, 6) is connected, the traction means (7, 8) for moving the elevator car (9) and the counterweights (5, 6) being drive-connected to a drive via a drive roller (14a, 14b, 14c, 14d), characterized in that, that two of the four drive rollers (14a, 14b, 14c, 14d) are connected to one another in a rotationally fixed manner via a common synchronous shaft (3, 4) which is drive-connected to an asynchronous motor (1, 2) as a drive, and that two counterweights (5, 6 ) are provided, each of which is connected to two separate synchronizer shafts (3, 4) associated traction means (7, 8).
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die Synchronwellen (3,4) zueinander parallel verlaufen. 2. Device according to claim 1, characterized in that the synchronizing shafts (3, 4) run parallel to one another.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die beiden einem gemeinsamen Gegengewicht (5,6) zugeordneten Antriebsrollen (14a, 14b, 14c, 14d) mit dem Gegengewicht (5,6) und den diesen Antriebsrollen (14a, 14b, 14c, 14d) zugeordneten Zugmitteln (7,8) in einer gemeinsamen Ebene (15) liegen. 3. Device according to claim 1 or 2, characterized in that the two drive rollers (14a, 14b, 14c, 14d) assigned to a common counterweight (5,6) with the counterweight (5,6) and these drive rollers (14a, 14b , 14c, 14d) associated traction means (7, 8) lie in a common plane (15).
4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass jene zwei, gesonderten Synchronwellen (3,4) zugeordneten, Zugmittel (7,8) mit dem kürzesten Abstand zueinander mit dem gleichen Gegengewicht (5,6) verbunden sind. 4. Device according to one of claims 1 to 3, characterized in that those two separate synchronizer shafts (3, 4) associated traction means (7, 8) with the shortest distance from one another are connected to the same counterweight (5, 6).
5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die beiden einem gemeinsamen Gegengewicht (5,6) zugeordneten Zugmittel (7,8) an jeweils gegenüberliegenden senkrechten Schenkeln (16) des gemeinsamen Gegengewichts (5,6) ansetzen. 5. Device according to one of claims 1 to 4, characterized in that the two traction means (7,8) assigned to a common counterweight (5,6) attach to opposite vertical legs (16) of the common counterweight (5,6).
6. Vorrichtung nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass die Gegengewichte (5,6) um eine zur Ebene (15) normal stehende Schwenkachse verschwenkbar angeordnet sind. 6. Device according to one of claims 3 to 5, characterized in that the counterweights (5, 6) are arranged to be pivotable about a pivot axis which is normal to the plane (15).
7. Vorrichtung nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, dass die Gegengewichte (5,6) gegen ein Verlagern entlang der Richtung der normal zur Ebene (15) stehenden Schwenkachse gesichert sind. 7. Device according to one of claims 3 to 6, characterized in that the counterweights (5, 6) are secured against shifting along the direction of the pivot axis normal to the plane (15).
8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass einer Seitenwand (21) der Liftkabine (9) zwei in Vertikalrichtung voneinander beabstandete Führungsrollenpaare (19) zugeordnet sind, wobei zum geführten Verlagern der Liftkabine (9) eine vertikale Führungsschiene (17,18) zwischen den Führungsrollen (20) des jeweiligen Führungsrollenpaares (19) angeordnet ist. 8. Device according to one of claims 1 to 7, characterized in that a side wall (21) of the elevator car (9) are assigned two vertically spaced guide roller pairs (19), a vertical guide rail ( 17,18) is arranged between the guide rollers (20) of the respective guide roller pair (19).
EP21710391.0A 2020-05-26 2021-02-25 Device for hoisting loads Active EP4157774B1 (en)

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AT601652020A AT523854A1 (en) 2020-05-26 2020-05-26
PCT/AT2021/060064 WO2021237256A1 (en) 2020-05-26 2021-02-25 Device for hoisting loads

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EP4157774A1 true EP4157774A1 (en) 2023-04-05
EP4157774C0 EP4157774C0 (en) 2024-06-05
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0846645B1 (en) * 1996-12-03 2004-08-04 Inventio Ag Elevator with modular construction
EP1006071A1 (en) * 1998-12-02 2000-06-07 Inventio Ag Elevator with two drives
FI20070562L (en) * 2007-07-20 2009-01-21 Kone Corp Elevator
EP3240752A1 (en) 2014-12-31 2017-11-08 Otis Elevator Company Elevator system roping arrangement

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EP4157774B1 (en) 2024-06-05
WO2021237256A1 (en) 2021-12-02
AT523854A1 (en) 2021-12-15

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