EP1375407A1 - Frein de sécurité pour dispositif de levage - Google Patents

Frein de sécurité pour dispositif de levage Download PDF

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Publication number
EP1375407A1
EP1375407A1 EP03076987A EP03076987A EP1375407A1 EP 1375407 A1 EP1375407 A1 EP 1375407A1 EP 03076987 A EP03076987 A EP 03076987A EP 03076987 A EP03076987 A EP 03076987A EP 1375407 A1 EP1375407 A1 EP 1375407A1
Authority
EP
European Patent Office
Prior art keywords
cage member
supply voltage
hoisting device
capacitors
available
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.)
Withdrawn
Application number
EP03076987A
Other languages
German (de)
English (en)
Inventor
Jan Boere
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.)
LTF Liften BV
Original Assignee
LTF Liften BV
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 LTF Liften BV filed Critical LTF Liften BV
Publication of EP1375407A1 publication Critical patent/EP1375407A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
    • B66B5/027—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions to permit passengers to leave an elevator car in case of failure, e.g. moving the car to a reference floor or unlocking the door

Definitions

  • the present invention relates to a hoisting device for transporting objects, particularly goods.
  • the invention also relates to a method for transporting objects.
  • Electric goods lifts of the non-counterweight type i.e. of a type in which no counterweight is arranged on the lift cage to hold the goods lift in balance, are frequently applied for transporting goods.
  • Two types can be distinguished here.
  • the lift cage is displaced using a hydraulic system.
  • a drawback of this type of goods lift is that, when goods of a high weight are placed in the lift cage, the lift cage moves slightly downward, which has the result that the floor of the lift cage is no longer at the same level as the floor.
  • the lift cage is displaced mechanically by means of one or more chains or cables driven with an electric motor.
  • this type of goods lift is usually provided with a brake.
  • This brake has the function of braking the lift when the supply voltage of the lift drive is interrupted or at least falls below a predetermined minimum value. During normal use such a brake is deactivated, whereby the lift can be displaced up and downward in unimpeded manner.
  • the brake is automatically activated and will thus prevent the lift dropping downward at increasing speed.
  • a hoisting device for transporting objects, particularly goods comprising:
  • the electric motor is energized with the supply voltage which is for instance supplied by the electricity grid. During normal operation the electric motors are thus connected to the power supply and not to the capacitors. When the hoisting device is out of operation, the electric motor is no longer energized but is however connected to one or more of the capacitors. At that moment the lift cage moving downward as a result of gravity drives the electric motor(s) of the drive via the chains or cables. The electric motor(s) then function as a type of "generator". The capacitors are charged by this generator action and at a given moment will begin to counteract the electric motor(s). The downward movement of the lift cage is braked as a result of this counteraction.
  • the counteraction depends on the rotation speed of the electric motor(s). Above a determined rotation speed the counteracting voltage increases exponentially, whereby the electric motor(s) and the lift cage connected thereto are braked to an increasing extent.
  • a braking function is brought about by connecting the electric motors to the capacitors, it is nevertheless recommended to provide separate braking means for braking the cage member in the shaft, wherein the braking means can be controlled so as to release the cage member when sufficient supply voltage is available and to brake the cage member when insufficient supply voltage or no supply voltage at all is available.
  • the braking means are embodied such that the cage member is brought to a complete standstill when there is no supply voltage on the electric motors.
  • the braking means which are preferably operated manually, can be deactivated by an operative, whereafter the lift cage will displace downward relatively slowly and in controlled manner until it arrives at the correct height in the lift shaft.
  • the capacities of the capacitors are so high that the lift cage of the hoisting device, at least in the case that too little supply voltage is available and, as the case arises, the braking means are deactivated, reaches a substantially constant downward speed.
  • the power supply preferably generates a three-phase alternating voltage, wherein at least one capacitor is used for each phase.
  • the capacitors are preferably delta-connected, wherein each of the phase terminals is connected to a corner of this delta connection.
  • Such a connection is relatively simple and inexpensive.
  • the switch is connected in series to the power supply for either connecting the electric motor to the power supply in the first position or connecting the electric motor to at least one capacitor in the second position. This ensures that the capacitors are never simultaneously connected to both the power supply and to the electric motors.
  • a method for transporting objects, particularly goods comprising of:
  • the method preferably comprises of adjusting the descent speed of the cage member when insufficient supply voltage is available by modifying the capacitance of one or more capacitors.
  • the capacitance at which the electric motor is connected the degree of "counteraction" by the electric motor is also set. This degree of counteraction determines the speed at which the lift cage will displace downward under the influence of the force of gravity.
  • an operative can adjust the speed of the lift cage as desired, this also depending on the weight of the goods situated in the lift cage at a given moment.
  • the capacitors therefore have a variable capacitance which, subject to the requirement, can be set directly by an operative such as an engineer from a position outside the lift cage. At a constant descent speed a relatively high capacitance is required when the lift is relatively heavily loaded. It is possible to suffice with a lower capacitance in the case of a less heavy lift load.
  • the method preferably also comprises of the above stated setting of the descent speed to a desired value.
  • a (practically) constant descent speed can be realized by correct adjustment of the capacitance of capacitors.
  • Figure 1 shows a goods lift 1 for transporting goods in a lift shaft s from the ground floor b to a first floor v of a building, and vice versa.
  • Goods lift 1 comprises a lift cage 2 arranged in lift shaft s and guidable along the walls thereof, which cage is provided with doors which can be opened 3.
  • Lift shaft s is embodied as a concrete shaft in which, at the position of the lift doors, openings corresponding therewith (not shown) are arranged on the ground floor and on the first floor.
  • Lift shaft s can however also be embodied in steel or the like. It is even conceivable to wholly dispense with a lift shaft and to guide the lift in a practically open construction.
  • the lift cage 2 shown in figure 1 is provided with a number of cage guides (not shown) with which the lift cage is guided along the shaft.
  • the drive of the lift cage comprises an electric motor 7 which is arranged at the top of shaft s.
  • the electric motor drives a shaft 8.
  • the rotation of shaft 8 is converted by means of a toothed wheel into a vertically upward respectively downward movement of a chain 9.
  • the chain is fixed to the top side of lift cage 2 so that the lift cage can be displaced in upward and downward direction using electric motor 7.
  • FIG. 1 also shows that electric motor 7 comprises a brake 10 so that when the electric motor itself cuts out or the supply voltage is cut off the lift cage 2 is held at a fixed position.
  • This brake can be operated manually, for instance by an engineer who has gained access to the top of the lift shaft.
  • Electric motor 7 (in the shown embodiment a second electric motor 7' is also provided) is a rotary current motor which is driven by a combination of three alternating currents L 1 , L 2 , L 3 (3 x 380 V) which have a relative phase difference of 120°.
  • the rotating magnetic field occurring as a result hereof in electric motors 7 brings about rotation of a motor armature (not shown) which transmits its rotation to drive shaft 8.
  • the electric motor 7 fulfills the function of generator for generating the combination of three alternating voltages.
  • Input circuit 11 comprises three inputs for the three phase leads as well as a switch (main switch) with which the electric motors 7,7' can be switched on and off.
  • Each of the three phase leads is connected to an electric motor 7' (or motors 7, 7').
  • relay switches 12,12',12'' connect the three phases L 1 , L 2 , L 3 to a delta connection 13 of capacitors.
  • a first capacitor C 1 is connected at nodes 15 and 16 to L 1 and L 2
  • a second capacitor C 2 is connected at nodes 16 and 17 to L 2 and L 3
  • a third capacitor C 3 is connected at nodes 15 and 17 to L 1 and L 3 .
  • the capacitance of the capacitors With a correct choice of the capacitance of the capacitors it is possible to achieve in this manner that the cage of the goods lift maintains a controlled, constant, low downward speed when the brake is released by hand.
  • This choice of capacitance can be such that the descent speed of the lift cage, which at a given moment will be constant, is realized when an average weight is arranged in lift cage 2.
  • the capacitance of the capacitors can be varied in situ by the engineer, so that the engineer has the option of adjusting the descent speed subject to the weight of the goods arranged in the lift cage.

Landscapes

  • Control And Safety Of Cranes (AREA)
  • Types And Forms Of Lifts (AREA)
EP03076987A 2002-06-24 2003-06-24 Frein de sécurité pour dispositif de levage Withdrawn EP1375407A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NL1020930 2002-06-24
NL1020930 2002-06-24
NL1021599A NL1021599C2 (nl) 2002-06-24 2002-10-08 Hefinrichting en werkwijze voor het transporteren van objecten.
NL1021599 2002-10-08

Publications (1)

Publication Number Publication Date
EP1375407A1 true EP1375407A1 (fr) 2004-01-02

Family

ID=29718473

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03076987A Withdrawn EP1375407A1 (fr) 2002-06-24 2003-06-24 Frein de sécurité pour dispositif de levage

Country Status (2)

Country Link
EP (1) EP1375407A1 (fr)
NL (1) NL1021599C2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006059182A1 (fr) * 2004-12-02 2006-06-08 Otis Elevator Company Dispositif de sauvetage de passagers enfermes dans une cabine d'ascenseur (et procede associe), et ascenseur en etant equipe,
CN102070053A (zh) * 2010-10-26 2011-05-25 西子奥的斯电梯有限公司 一种电梯轿厢上行超速保护装置的试验装置
CN105480809A (zh) * 2015-12-29 2016-04-13 上海新时达电气股份有限公司 电梯上行超速保护装置的测试方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2119833A1 (fr) 2008-05-13 2009-11-18 Heijmans Infrastructuur B.V. Procédé d'effectuer travail en sol

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1754779A (en) * 1925-12-14 1930-04-15 Haughton Elevator & Machine Co Dynamo-electric control system
DE19716547A1 (de) * 1996-05-22 1998-03-12 Becker Antriebe Gmbh Antrieb für Rauchschutzvorhänge, Feuerschutzbehänge o. dgl. Behänge
DE10050186A1 (de) * 1999-10-08 2001-06-21 Weinig Michael Ag Verfahren zum Abbremsen einer Drehstorm-Asynchronmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1754779A (en) * 1925-12-14 1930-04-15 Haughton Elevator & Machine Co Dynamo-electric control system
DE19716547A1 (de) * 1996-05-22 1998-03-12 Becker Antriebe Gmbh Antrieb für Rauchschutzvorhänge, Feuerschutzbehänge o. dgl. Behänge
DE10050186A1 (de) * 1999-10-08 2001-06-21 Weinig Michael Ag Verfahren zum Abbremsen einer Drehstorm-Asynchronmaschine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006059182A1 (fr) * 2004-12-02 2006-06-08 Otis Elevator Company Dispositif de sauvetage de passagers enfermes dans une cabine d'ascenseur (et procede associe), et ascenseur en etant equipe,
CN102070053A (zh) * 2010-10-26 2011-05-25 西子奥的斯电梯有限公司 一种电梯轿厢上行超速保护装置的试验装置
CN102070053B (zh) * 2010-10-26 2012-10-10 西子奥的斯电梯有限公司 一种电梯轿厢上行超速保护装置的试验装置
CN105480809A (zh) * 2015-12-29 2016-04-13 上海新时达电气股份有限公司 电梯上行超速保护装置的测试方法
CN105480809B (zh) * 2015-12-29 2018-09-21 上海新时达电气股份有限公司 电梯上行超速保护装置的测试方法

Also Published As

Publication number Publication date
NL1021599C2 (nl) 2003-12-29

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