EP1086921B1 - Aufzugssicherheitseinrichtung - Google Patents

Aufzugssicherheitseinrichtung Download PDF

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Publication number
EP1086921B1
EP1086921B1 EP99909205A EP99909205A EP1086921B1 EP 1086921 B1 EP1086921 B1 EP 1086921B1 EP 99909205 A EP99909205 A EP 99909205A EP 99909205 A EP99909205 A EP 99909205A EP 1086921 B1 EP1086921 B1 EP 1086921B1
Authority
EP
European Patent Office
Prior art keywords
counterweight
car
speed governor
side speed
rope
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.)
Expired - Lifetime
Application number
EP99909205A
Other languages
English (en)
French (fr)
Other versions
EP1086921A4 (de
EP1086921A1 (de
Inventor
Yasushi Mitsubishi Denki K.K. CHADANI
Masami Mitsubishi Denki K.K. YOSHIKAWA
Ad Wolter and Dros-Evli B.V. VAN EEKELEN
Breunis Wolter & Dros-Evli B.V. VAN DE POL
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP1086921A1 publication Critical patent/EP1086921A1/de
Publication of EP1086921A4 publication Critical patent/EP1086921A4/de
Application granted granted Critical
Publication of EP1086921B1 publication Critical patent/EP1086921B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B66B5/04—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed
    • B66B5/044—Mechanical overspeed governors

Definitions

  • the present invention relates to a safety device for a roped elevator, and more particularly, to a safety device for an elevator for suppressing a raising speed of a car when the car goes up at overspeed.
  • US-A-5 183 979 discloses a fail-safe system for a lift that prevents motion when the doors are open.
  • Fig. 5 is a schematic view showing a conventional elevator shown in Japanese Patent Application Laid -Open Nos. Hei 6-1561 and Hei 6-179585.
  • a machine room 2 is located on a hoistway 1.
  • a hoisting machine 3 as a driving machine is provided in the machine room 2.
  • the hoisting machine 3 is provided with a brake 4 for stopping the rotation of a driving sheave 3a.
  • a main rope 5 is wound around the driving sheave 3a of the hoisting machine 3.
  • a car 6 is suspended at one end portion of the main rope 5 and a counterweight 7 is suspended at the other end portion of the main rope 5.
  • the car 6 and the counterweight 7 are alternatively raised and lowered by a driving force of the hoisting machine 3.
  • a speed governor 8 for detecting overspeed of the car 6 is provided in the machine room 2.
  • a speed governor rope 9 is wound around the speed governor 8. Both ends of the speed governor rope 9 are connected to an emergency stop device 11 which is provided at the lower portion of the car 6, , so that the speed governor rope 9 is circulated in accordance with the up-and-down movement of the car 6.
  • a tension sheave 10 for imparting a tension to the speed governor rope 9 is provided at the lower end portion of the loop-like speed governor rope 9.
  • a car side damper 12 for receiving the car 6 when the car 6 is lowered down to a lowermost position below the movement range of the normal operation and a counterweight side damper 13 for receiving the counterweight 7 when the counterweight 7 is lowered down to the lowermost position are provided at the bottom of the hoistway 1.
  • the car 6 and the counterweight 7 are raised and lowered within the hoistway 1 by the driving force of the hoisting machine 3.
  • the speed governor 8 detects increase in the circulation speed of the governor rope 9, so that the brake 4 works.
  • the speed governor brake (not shown) provided in the speed governor 8 works to impart a mechanical braking force to the speed governor rope 9 to thereby operate the emergency stop device 11. Also, in the case where the car 6 collides with the car side damper 12 before the car 6 has been stopped by the emergency stop device 11, the impact from the collision is moderated with the car side damper 12.
  • the kind or the number of the means for reducing/stopping overspeed when the car 6 is raised is few in comparison with the means for reducing/stopping overspeed when the car 6 is lowered. Accordingly, there is a demand to further improve in safety aspect.
  • An object of the present invention is to provide a safety device for making it possible to enhance the safety aspect for overspeed when the car is raised.
  • a safety device for an elevator including a hoistway, a car and a counterweight that are moved up and down within the hoistway, a rope for suspending the car and the counterweight within the hoistway, a driving machine for raising and lowering the car and the counterweight through the rope, and a counterweight side damper for receiving the counterweight when the counterweight is lowered down to a lowermost position
  • said safety device comprising:
  • Fig. 1 is a structural view showing an example of an elevator in accordance with an embodiment of the present invention.
  • a machine room 2 is located on a hoistway 1.
  • a hoisting machine 3 as a driving machine is provided in the machine room 2.
  • the hoisting machine 3A is provided with a brake 4 for stopping the rotation of a driving sheave 3a.
  • a main rope 5 is wound around the driving sheave 3a of the hoisting machine 3.
  • a car 6 is suspended at one end portion of the main rope 5, and a counterweight 7 is suspended at the other end portion of the main rope 5.
  • the car 6 and the counterweight 7 are alternatively raised and lowered by a driving force of the hoisting machine 3.
  • a car side speed governor 8 for detecting overspeed of the car 6 is provided in the machine room 2.
  • a car side speed governor rope 9 is wound around the car side speed governor 8. Both ends of the car side speed governor rope 9 are connected to an emergency stop device 11 provided at the lower portion of the car 6, so that the car side speed governor rope 9 is circulated in accordance with the up-and-down movement of the car 6.
  • a tension sheave 10 for imparting a tension to the car side speed governor rope 9 is provided at the lower end portion of the loop-like car side speed governor rope 9.
  • a car side damper 12 for receiving the car 6 when the car 6 is lowered down to the lowermost position below the movement range of the normal operation and a counterweight side damper 13 for receiving the counterweight 7 when the counterweight 7 is lowered down to the lowermost position are provided at the bottom of the hoistway 1.
  • a counterweight side speed governor 21 for detecting overspeed of the counterweight 7, which has substantially the same structure as that of the car side speed governor 8 is provided in the machine room 2.
  • a counterweight side speed governor rope 22 is wound around the counterweight side speed governor 21. Both ends of the counterweight side speed governor rope 22 are connected to an upper and a lower end portions of the counterweight 7 through brackets 23a and 23b, respectively, so that the counterweight side speed governor rope 22 is circulated in accordance with the up-and-down movement of the counterweight 7.
  • a tension sheave 24 for imparting a tension to the counterweight side speed governor rope 22 is provided at the lower end portion of the loop-like counterweight side speed governor rope 22.
  • Fig. 2 is a frontal view showing the counterweight side speed governor 21 in Fig. 1.
  • a base 31 is fixed above the hoistway 1.
  • a sheave 33 that is rotatable about a shaft 32 is supported by the base 31.
  • a pair of flyweights 36 and 37 that are rotatable about shafts 34 and 35, respectively, are mounted on the sheave 33.
  • the flyweights 36 and 37 are coupled with each other through a link 38.
  • a balance spring 39 is provided between one of the flyweights 37 and the sheave 33.
  • the flyweights 36 and 37 are rotated about the shafts 34 and 35 against the balance spring 39 by a centrifugal force generated from the rotation of the sheave 33.
  • a ratchet 41 that is rotatable about the shaft 32 independently of the sheave 33 is supported by the base 31. Also, a brake arm 43 that is rotatable about a shaft 42 is supported by the base 31. A brake piece 44 that faces the counterweight side speed governor rope 22 wound around the sheave 33, is mounted on the brake arm 43.
  • One end of an operating rod 45 is rotatably coupled with the ratchet 41.
  • a spring shaft 46 passing through the brake arm 43 is fixed to the other end of the operating rod 45.
  • a spring seat 47 is provided through an end of a spring shaft 46 opposite to the operating rod 45, and a plurality of nuts 48 are screwed thereto.
  • a compressing coiled spring 49 is provided between the spring seat 47 and the brake arm 43.
  • One of the flyweights 37 is provided with a latch portion 37a for engaging with the teeth of the ratchet 41.
  • the detecting mechanism in this embodiment has the shafts 34 and 35, the flyweights 36 and 37, the link 38, the balance spring 39 and the ratchet 41.
  • the speed governor brake has the shaft 42, the brake arm 43, the brake piece 44, the operating rod 45, the spring shaft 46, the spring seat 47, the nuts 48 and the compression coiled spring 49.
  • the car side speed governor 8 and the counterweight side speed governor 21 have substantially the same structure but the car side speed governor 8 is further provided with a stop switch 51 and an operating member 52 in addition to the counterweight side speed governor 21 as indicated by a two-dot-and-dash line in Fig. 2.
  • the stop switch 51 is mounted on the base 31 and output a signal for operating the brake 4.
  • the operating member 52 is attached to the flyweight 37 and operates the stop switch 51 in accordance with the rotation of the flyweight 37.
  • the car 6 and the counterweight 7 are moved up and down within the hoistway 1 by the driving force of the hoisting machine 3.
  • the speed of the car 6 exceeds the rated speed due to a certain cause during the lowering operation of the car 6, the increased circulation speed of the car side speed governor rope 9 is detected by the car side speed governor 8 so that the brake 4 works.
  • the dimension (height) of the top clearance is determined in accordance with the set speed of the counterweight damper 13. Namely, when the counterweight 7 collides with the counterweight side damper 13 at lower speed than the set speed, the extent of the bounce of the car 6 is in the range of the top clearance, and therefore the car 6 is not collide with the ceiling of the hoistway 1. Also, the set speed of the counterweight side damper 13 is designed in accordance with the rated speed of the elevator.
  • the braking force is applied to the counterweight side speed governor rope 22 by the counterweight side speed governor 21.
  • the second overspeed is set to be not higher than the set speed of the counterweight side damper 13.
  • the latch portion 37a engages with the teeth of the ratchet 41 so that the ratchet 41 is rotated in the same direction as that of the sheave 33.
  • the operating rod 45 is shifted and the brake arm 43 is moved toward the sheave 33 so that the counterweight side speed governor rope 22 is depressed against the sheave 33 by the brake piece 44 and the counterweight side speed governor rope 22 is braked by the frictional force.
  • the counterweight side speed governor rope 22 is braked, so that the counterweight 7 is stopped or the lowering speed of the counterweight 7 is decelerated equal to or less than the set speed of the counterweight side damper 13. Accordingly, if the brake 4 should fail to work or the gear of the hoisting machine 3 is damaged, it is possible to prevent the car 6 from colliding with the ceiling of the hoistway 1 to thereby enhance the safety aspect for overspeed when the car 6 is raised.
  • Fig. 3 is an explanatory view showing a braking force required to the counterweight side speed governor 21 in Fig. 1.
  • W1 is the weight of the car 6
  • W2 is the weight of the counterweight 7
  • F1 is the braking force by the counterweight side speed governor 21
  • ⁇ is downward acceleration of the counterweight 7.
  • the braking force required for the counterweight side speed governor 21, i.e., the minimum braking force required for decelerating the car 6 and the counterweight 7 is only the difference between the weight of the counterweight 7 and the car 6 when no load is applied ( ⁇ is less than zero when F1 ⁇ W2-W1).
  • This braking force is much smaller than a force needed for braking the car 6 accelerating as it moves down when the main rope is 5 is cut off. Accordingly, it is possible to enhance the safety aspect for overspeed when the car is raised by utilizing substantially the same structure as the structure of the car side speed governor 8.
  • the traction is not generated at the time the counterweight 7 collides with the counterweight side damper 13, and the car 6 is caused to bounce after the counterweight side damper 13 has been fully compressed. Accordingly, the extent of the bounce of the car 6 is within the range of the top clearance.
  • the counterweight side speed regulation 21 is not provided with the stop switch 51 and the operating member 52, it is also possible to apply the same structure as that of the speed governor 8 to the counterweight side speed governor 21.
  • the set speed of the stop switch 51 of the counterweight side speed governor 21 is somewhat higher than the speed of the car side speed governor 8 or the output of the stop switch 51 of the counterweight side speed governor 21 is disabled.
  • Fig. 4 is a flowchart of the operation in the case where the counterweight side speed governor 21 is provided with the stop switch 51.
  • the signal for operating the brake 4 of the hoisting machine 3 is outputted again (step S4). Thereafter, the counterweight side speed governor 21 mechanically detects whether or not the lowering speed of the counterweight 7 is equal to or less than the second overspeed speed (step S5). Then, when the lowering speed of the counterweight 7 exceeds the second overspeed, as described above, the counterweight side speed governor rope 22 is braked by the counterweight side speed governor 21.
  • the counterweight side speed governor 21 is provided with the stop switch 51 so that, even if the stop switch 51 of the car side speed governor 8 fails to work, the brake 4 is operated in accordance with the first set value to thereby further enhance the safety aspect.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)

Claims (2)

  1. Sicherheitsvorrichtung für einen Aufzug umfassend einen Aufzugsschacht (1), eine Kabine (6) und ein Gegengewicht (7), die innerhalb des Aufzugschachts auf und ab bewegt werden, ein Seil (5) zum Aufhängen der Kabine und des Gegengewichts innerhalb des Aufzugschachts, einer Antriebsmaschinerie (3) zum Anheben und Absenken der Kabine und des Gegengewichts durch das Seil und ein Gegengewichtseitendämpfer (13) zur Aufnahme des Gegengewichts wenn das Gegengewicht nach unten in eine niedrigste Position abgelassen wird, wobei die Sicherheitsvorrichtung umfasst:
    ein Gegengewichtsseitengeschwindigkeitsregelungsseil (22), das in Übereinstimmung mit der Auf- und Niederbewegung des Gegengewichtes in Umlauf gebracht wird, und
    ein Gegengewichtsseitengeschwindigkeitsregler (21), der im Betrieb mechanisch eine Bremskraft auf das Gegengewichtsseitengeschwindigkeitsregelungsseil aufbringt, wenn die Absenkungsgeschwindigkeit des Gegengewichts eine vorbestimmte Geschwindigkeit überschreitet, dadurch gekennzeichnet, dass die Bremskraft des Gegengewichtsseitengeschwindigkeitsreglers (21) auf die Differenz zwischen dem Gewicht des Gegengewichts (7) und dem Gewicht der Kabine (6) ohne Belastung, oder auf mehr, eingestellt wird.
  2. Sicherheitsvorrichtung für den Lift gemäß Anspruch 1, wobei der Gegengewichtseitengeschwindigkeitsregler (21) umfasst:
    eine Basis (31) die oberhalb des Kabinenschachts (1) angeordnet ist,
    eine Laufrolle (33), die drehbar an der Basis angeordnet ist und um die das Gegengewichtseitengeschwindigkeitsregelungsseil (22) herumgewunden ist,
    einen Detektionsmechanismus zur Detektion einer Überschreitungsgeschwindigkeit des Gegengewichts in Übereinstimmung mit der Drehung der Laufrolle, und
    eine Gewichtsregelungsbremse (44) zum Bremsen des Gegengewichtsseitengeschwindigkeitsregelungsseils, wenn eine Übergeschwindigkeit des Gegengewichts durch den Detektionsmechanismus detektiert wird.
EP99909205A 1999-03-17 1999-03-17 Aufzugssicherheitseinrichtung Expired - Lifetime EP1086921B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1999/001325 WO2000055085A1 (fr) 1999-03-17 1999-03-17 Dispositif de securite pour ascenseur

Publications (3)

Publication Number Publication Date
EP1086921A1 EP1086921A1 (de) 2001-03-28
EP1086921A4 EP1086921A4 (de) 2002-11-06
EP1086921B1 true EP1086921B1 (de) 2006-01-18

Family

ID=14235212

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99909205A Expired - Lifetime EP1086921B1 (de) 1999-03-17 1999-03-17 Aufzugssicherheitseinrichtung

Country Status (3)

Country Link
EP (1) EP1086921B1 (de)
DE (1) DE69929515T2 (de)
WO (1) WO2000055085A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9033111B2 (en) 2009-07-20 2015-05-19 Otis Elevator Company Elevator governor system

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4809971B2 (ja) * 2000-10-16 2011-11-09 三菱電機株式会社 エレベータの調速装置
WO2003050029A1 (fr) * 2001-12-11 2003-06-19 Mitsubishi Denki Kabushiki Kaisha Ascenseur
FI117239B (fi) * 2001-12-27 2006-08-15 Kone Corp Hissin turvalaite
WO2006022015A1 (ja) * 2004-08-27 2006-03-02 Mitsubishi Denki Kabushiki Kaisha エレベータ装置
JP2009107809A (ja) * 2007-10-31 2009-05-21 Hitachi Ltd エレベーター装置
JP2009263015A (ja) * 2008-04-22 2009-11-12 Hitachi Ltd エレベーター装置
DE112016006890B4 (de) * 2016-05-23 2022-01-13 Mitsubishi Electric Corporation Aufzugseinrichtung
US10501286B2 (en) 2017-05-12 2019-12-10 Otis Elevator Company Simultaneous elevator car and counterweight safety actuation

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5131445A (ja) * 1974-09-11 1976-03-17 Mitsubishi Electric Corp Erebeetasochi
JPS5934631B2 (ja) * 1978-11-28 1984-08-23 清水建設株式会社 昇降装置
US5183979A (en) * 1991-07-22 1993-02-02 Otis Elevator Company Elevator governor rope restraint when elevator car moves with car doors open

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9033111B2 (en) 2009-07-20 2015-05-19 Otis Elevator Company Elevator governor system

Also Published As

Publication number Publication date
WO2000055085A1 (fr) 2000-09-21
DE69929515D1 (de) 2006-04-06
EP1086921A4 (de) 2002-11-06
EP1086921A1 (de) 2001-03-28
DE69929515T2 (de) 2006-09-21

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