EP2088111A1 - Amortisseur d'ascenseur - Google Patents

Amortisseur d'ascenseur Download PDF

Info

Publication number
EP2088111A1
EP2088111A1 EP06833448A EP06833448A EP2088111A1 EP 2088111 A1 EP2088111 A1 EP 2088111A1 EP 06833448 A EP06833448 A EP 06833448A EP 06833448 A EP06833448 A EP 06833448A EP 2088111 A1 EP2088111 A1 EP 2088111A1
Authority
EP
European Patent Office
Prior art keywords
plunger
plungers
stage
coil spring
buffer
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Withdrawn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
EP06833448A
Other languages
German (de)
English (en)
Other versions
EP2088111A4 (fr
Inventor
Mitsuyoshi Imura
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 EP2088111A1 publication Critical patent/EP2088111A1/fr
Publication of EP2088111A4 publication Critical patent/EP2088111A4/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • B66B5/28—Buffer-stops for cars, cages, or skips

Definitions

  • the present invention relates to a buffer of an elevator that is disposed in a pit bottom of a shaft and reduces impacts and ensures a safe stop when a car or a counterweight of an elevator passes a bottom floor for some abnormal reason and descends to a pit portion of the shaft.
  • a buffer of an elevator is a safety device that reduces impacts and ensures a safe stop when a car or a counterweight of an elevator passes a bottom floor for some abnormal reason and descends to a pit portion of the shaft.
  • An orifice-control rod type hydraulic buffer has hitherto been used as a buffer of this kind.
  • a multistage hydraulic buffer comprises a base cylinder filled with a hydraulic oil and plungers of a plurality of stages that enter this base cylinder, which are formed to have gradually decreasing diameters and configured to be capable of expanding and contracting axially.
  • This hydraulic buffer is configured to generate a buffering function due to a pressure difference resulting from the movement of the hydraulic oil upon entry of a plunger of each stage into the base cylinder or a lower-stage plunger.
  • This hydraulic buffer is configured to ensure that plungers of at least two or more stages enter the base cylinder or the lower-stage plunger simultaneously, and to ensure that fluid resistance changes for the entry of the plungers of at least two or more stages according to the depth of entry of the plungers of at least two or more stages.
  • This hydraulic buffer arrange a return coil spring in each stage (refer to Patent Document 1, for example).
  • Patent Document 1 Japanese Patent Laid-Open No. 2004-324879
  • the present invention has been made to solve problems as described above, and provides a buffer of an elevator that enables the height of the whole buffer to be shortened while ensuring a equivalent stroke, enables the cost to be reduced by the shortening of the total height of the buffer, and enables assemblability and installability to be improved.
  • a buffer of an elevator of the present invention is A buffer of an elevator comprising a base cylinder filled with a hydraulic oil and plungers of a plurality of stages, which are formed to have gradually decreasing diameters and configured to be capable of expanding and contracting axially, configured to generate a buffering function due to a pressure difference resulting from the movement of the hydraulic oil upon entry of a plunger of each stage into the base cylinder or a lower-stage plunger, disposed on a pit bottom of a shaft, and configured to ensure that plungers of at least two or more stages enter the base cylinder or the lower-stage plunger during compression operation, and to ensure that fluid resistance changes for the entry of the plungers of at least two or more stages according to the depth of entry of the plungers of at least two or more stages, each of the plungers being provided with a return coil spring that returns each of the compressed plungers to an elongated condition before compression, characterized in that a return coil spring that returns a plunger entering the base cylinder has a large diameter and is
  • the present invention it is possible to obtain a multistage hydraulic buffer that enables the height dimension of the whole buffer to be shortened while ensuring a equivalent stroke.
  • the cost can be reduced by the shortening of the total height of the buffer and assemblability and installability can be improved.
  • the floor portion of the shaft can be made shallower than in conventional buffers, the construction cost of the shaft can be reduced.
  • Figure 1 is a sectional block diagram showing the condition of a buffer of an elevator that is elongated in a first embodiment of the present invention.
  • Figure 2 is a sectional block diagram showing the condition of a buffer of an elevator that is compressed in a first embodiment of the present invention.
  • the buffer is composed of a base cylinder 1 filled with a hydraulic fluid, a first plunger 2 that is fitted into a first control cylinder 11 provided within this base cylinder 1 and enters the first control cylinder 11 in a sliding manner, and a second plunger 3 that is fitted into a second control cylinder 21 provided within the first plunger 2 and enters the second control cylinder 21 in a sliding manner.
  • a plurality of first orifice groups 12 are appropriately provided in the axial direction of the cylinder.
  • a plurality of second orifice groups 22 are appropriately provided in the axial direction of the cylinder.
  • a cushion material 4 is provided to prevent metal-to-metal contact between an ascending and descending body, such as an elevator car and a counterweight, and the plungers.
  • An oil chamber 24 is formed between the second control cylinder 21 and a peripheral wall 23 of the first plunger 2.
  • an oil passage 25 that provides communication between the oil chamber 24 and the base cylinder 1.
  • a second sliding member 30 is provided in a lower part of a peripheral portion of the second plunger 3, and the second plunger 3 slides on an inner wall of the second control cylinder 21 while keeping oil tightness and enters the interior of the first plunger 2.
  • the hydraulic oil within the first plunger 2 pressurized by the second plunger 3 passes through the second orifice group 22, whereby the pressure of the hydraulic oil is reduced, the hydraulic oil flows through the oil chamber 24 and is led to the oil passage 25.
  • a first sliding member 20 is provided in a lower part of a peripheral portion of the first plunger 2, and the first plunger 2 slides on an inner wall of the first control cylinder 11 while keeping oil tightness and enters the interior of the base cylinder 1.
  • the hydraulic oil within the base cylinder 1 pressurized by the first plunger 2 passes through the first orifice group 12, whereby the pressure of the hydraulic oil is reduced, the hydraulic oil is led to a first oil chamber 14a and a second oil chamber 14b, which are formed on the outer side of the first control cylinder 11.
  • the first oil chamber 14a is provided in a peripheral portion of the first control cylinder 11, and the second oil chamber 14b is provided on the outer side of the first oil chamber 14a.
  • a base cylinder wall 13 is provided between the first oil chamber 14a and the second oil chamber 14b, and the second oil chamber 14b provided in an outermost shell is in communication with the first oil chamber 14a via an oil passage 15 provided in a lower part of the base cylinder wall 13.
  • the height of the first oil chamber 14a and the second oil chamber 14b is configured to be lower than the height of each of the plungers 2, 3 obtained when the plungers are fully compressed.
  • Within the second oil chamber 14b there is provided a piston 17 that slides along an inner wall.
  • the piston 17 hermetically seals the hydraulic oil within the second oil chamber 14b, and the piston 17 gives a prescribed pressure to the hydraulic oil of the whole hydraulic buffer and has a weight sufficient for keeping a prescribed oil level.
  • the second oil chamber 14b is flush with the first oil chamber 14a and is configured to be lower than the height of each of the plungers 2, 3 obtained when the plungers are fully compressed.
  • a space area 16 is formed within the second oil chamber 14b.
  • the hydraulic oil that has been led from the first oil chamber 14a to the second oil chamber 14b via the oil passage 15 pushes up the piston 17 to the space area 16 and is stored within the second oil chamber 14b.
  • an air hole 18 is provided so that the downward pressure acting on the piston 17 does not fluctuate due to the vertical motion of the piston 17.
  • the first plunger 2 and the second plunger 3 are separately provided with a first return coil spring 5 and a second return coil spring 6, respectively, for returning each of the compressed plungers 2, 3 to an elongated condition before compression.
  • the weight of structural members constituting each of the plungers 2, 3 is supported by the above-described first return coil spring 5 and second return coil spring 6.
  • the first return coil spring 5 for returning the first plunger 2 to an elongated condition before compression has a large diameter and is disposed on the outer side of the peripheral wall 23 of the first plunger 2 between a flanged portion of a top end of the first plunger 2 and an upper surface of a top end portion of the base cylinder 1.
  • the second return coil spring 6 for returning the second plunger 3 to an elongated condition before compression has a smaller diameter than the first return coil spring 5 and is disposed within the second control cylinder 21 provided on the inner side of the first plunger 2 between a bottom surface of a bottom plate 8 of the second plunger 3 and a top surface of the bottom of the first plunger 2.
  • the hydraulic buffer is such that the space on the lower side of the second oil chamber 14b partitioned by the piston 17, and the interior of the first oil chamber 14a, the first control cylinder 11, the oil chamber 24 and the second control cylinder 21 are filled with a hydraulic oil. If the elevator car (or the counterweight) collides against the hydraulic buffer due to some abnormality, the second plunger 3 ascends within the second control cylinder 21 of the first plunger 2.
  • the hydraulic oil within the second control cylinder 21 is pressurized, supports the second plunger 3 upward, and pushes down the first plunger 2 while giving a decelerating force to the elevator car.
  • the hydraulic oil spouts from the openings of the second orifice group 22 into the oil chamber 24 by just the volume of the second plunger 3 that has entered the second control cylinder 21, and the pressure of the hydraulic oil is reduced by fluid resistance.
  • the total opening area of the second orifice group 22 provided in the second control cylinder 21 decreases as the second plunger 3 descends, and the fluid resistance increases gradually.
  • the oil chamber 24 is in communication with the space within the first control cylinder 11 via the oil passage 25. Because the opening area of the oil passage 25 is set to be larger than the opening area of the second orifice group 22, the pressure within the oil chamber 24 and the pressure within the first control cylinder 11 are almost the same.
  • the first plunger 2 is pushed down by the pressure within the second control cylinder 21, and at this time, the hydraulic oil flows into the first control cylinder 11 also from the oil passage 25 and the hydraulic oil within the first control cylinder 11 is pressurized, generating a force that supports the first plunger 2 upward.
  • the hydraulic oil does not flow back into the second control cylinder 21 and the hydraulic oil spouts from the openings of the first orifice group 12 to the first oil chamber 14a by just the volume of the first plunger 2 that has entered the first control cylinder 11 and by just the volume of the hydraulic oil that has passed through the oil passage 25 and entered the first control cylinder 11.
  • the pressure of the hydraulic oil that spouts from the openings of the first orifice group 12 is reduced by fluid resistance and is reduced by the mass of the piston 17 to a pressure that is constantly given to the hydraulic oil of the oil chamber 14a.
  • the total opening area of the first orifice group 12 provided in the first control cylinder 11 decreases as the first plunger 2 descends, and the fluid resistance increases. Because the first oil chamber 14a is in communication with the second oil chamber 14b via the oil passage 15 and the first oil chamber 14a is already filled with the hydraulic oil, the hydraulic oil that has spouted pushes up the piston 17 of the second oil chamber 14b. Because the opening area of the oil passage 15 is set to be larger than the opening area of the first orifice group 12, the pressure within the first oil chamber 14a and the pressure within the second oil chamber 14b are almost the same. This pressure is constantly maintained at the same level as a sum of the pressure due to the load of the piston and the atmospheric pressure when sliding resistance of the piston 17 is ignored.
  • the hydraulic coil stored in the second oil chamber 14b is pushed in by the mass of the piston 17, passes from the oil passage 15 to the first oil chamber 14a, the first orifice group 12 of the first control cylinder 11, the oil passage 25, the oil chamber 24, and the second orifice group 22 of the second control cylinder 21 in a flow reverse to the flow at the buffering action, and gradually fills each space.
  • the total height in an elongated condition ( Figure 3c ) is 10500 mm
  • the total height in a compressed condition ( Figure 3d ) is 4500 mm
  • the stroke from an elongated condition to a compressed condition is 6000 mm
  • the compressed height of the first return coil spring is 1000 mm
  • the compressed height of the second return coil spring is 1000 mm.
  • the present invention it is possible to shorten the total height of the buffer by approximately 1/2 of the compressed height of the first return coil spring 5 and the second return coil spring 6 although the base cylinder 1, the first plunger 2 and the second plunger 3 have different lengths.
  • the floor portion of the shaft can be made shallower than in conventional buffers and, therefore, it is possible to reduce the construction cost of the shaft.
  • the buffer of an elevator related to the present invention can be applied to a multistage hydraulic buffer that is disposed in a pit bottom of a shaft and reduces impacts and ensures a safe stop when a car or a counterweight of an elevator passes a bottom floor for some abnormal reason and descends to a pit portion of the shaft.

Landscapes

  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Types And Forms Of Lifts (AREA)
EP06833448.1A 2006-11-28 2006-11-28 Amortisseur d'ascenseur Withdrawn EP2088111A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2006/323644 WO2008065706A1 (fr) 2006-11-28 2006-11-28 Amortisseur d'ascenseur

Publications (2)

Publication Number Publication Date
EP2088111A1 true EP2088111A1 (fr) 2009-08-12
EP2088111A4 EP2088111A4 (fr) 2013-08-21

Family

ID=39467510

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06833448.1A Withdrawn EP2088111A4 (fr) 2006-11-28 2006-11-28 Amortisseur d'ascenseur

Country Status (5)

Country Link
EP (1) EP2088111A4 (fr)
JP (1) JPWO2008065706A1 (fr)
KR (1) KR100975189B1 (fr)
CN (1) CN101541659B (fr)
WO (1) WO2008065706A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2733106A1 (fr) * 2012-11-20 2014-05-21 Kone Corporation Ascenseur avec une longueur de tampon réglable

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101283897B1 (ko) * 2012-02-14 2013-07-16 현대엘리베이터주식회사 엘리베이터용 다단식 유압 완충기
CN103183272B (zh) * 2013-03-18 2015-07-22 苏州富士电梯有限公司 一种电梯钢丝绳延伸调节装置
CN105156538A (zh) * 2013-07-29 2015-12-16 蒋红娟 处理器模块控制的液压成型制砖机的工作方法
CN104154157B (zh) * 2014-08-15 2016-09-07 湖北民族学院 一种多级减震器
CN104495564B (zh) * 2014-11-30 2017-05-24 重庆和航科技股份有限公司 用于电梯的还原阻尼装置
CN104477728A (zh) * 2014-11-30 2015-04-01 重庆和航科技股份有限公司 递进缓冲阻尼力的电梯系统
CN105084152B (zh) * 2015-07-28 2017-10-03 嘉兴川页奇精密自动化机电有限公司 电梯救生安全台
CN106395549A (zh) * 2016-10-28 2017-02-15 成都聚智工业设计有限公司 一种电梯缓冲器
CN107165975A (zh) * 2017-07-12 2017-09-15 广东皇冠电梯有限公司 一种防水防冻电梯缓冲器
CN109987475A (zh) * 2019-04-29 2019-07-09 福州快科电梯工业有限公司 嵌入式多级电梯缓冲器及其工作方法
CN111559685B (zh) * 2020-05-21 2021-06-11 中元建设集团股份有限公司 一种防冲顶坠落装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57175832U (fr) * 1981-04-30 1982-11-06
JPS5997335A (ja) * 1982-11-22 1984-06-05 Teruichi Iimoto 緩衝装置
JP3795792B2 (ja) * 2001-11-05 2006-07-12 三菱電機株式会社 多段油圧緩衝装置
JP4301837B2 (ja) 2002-05-21 2009-07-22 三菱電機株式会社 エレベータの緩衝装置
JP4325417B2 (ja) 2003-04-10 2009-09-02 三菱電機株式会社 油圧緩衝器

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No further relevant documents disclosed *
See also references of WO2008065706A1 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2733106A1 (fr) * 2012-11-20 2014-05-21 Kone Corporation Ascenseur avec une longueur de tampon réglable
WO2014079673A1 (fr) * 2012-11-20 2014-05-30 Kone Corporation Ascenseur à longueur d'amortisseur ajustable
US9517919B2 (en) 2012-11-20 2016-12-13 Kone Corporation Elevator with adjustable buffer length

Also Published As

Publication number Publication date
CN101541659A (zh) 2009-09-23
KR100975189B1 (ko) 2010-08-10
KR20090060349A (ko) 2009-06-11
EP2088111A4 (fr) 2013-08-21
WO2008065706A1 (fr) 2008-06-05
JPWO2008065706A1 (ja) 2010-03-04
CN101541659B (zh) 2011-05-04

Similar Documents

Publication Publication Date Title
JP4325417B2 (ja) 油圧緩衝器
US8360210B2 (en) Oil buffer for an elevator
JP5081066B2 (ja) エレベーター用油圧緩衝器
KR100532270B1 (ko) 엘리베이터의 완충 장치
EP2088111A1 (fr) Amortisseur d'ascenseur
JP5411178B2 (ja) エレベーター用油圧緩衝器
CN101776104A (zh) 单作用柱塞式缓冲液压油缸
CN102985349B (zh) 缓冲器
CN101209793A (zh) 电梯装置
JP2003146554A (ja) 多段油圧緩衝装置
KR102148632B1 (ko) 체적가변 피스톤을 이용한 유압 배력(油壓 培力) 장치
JP2014028698A (ja) エレベータ用緩衝器およびその制御方法
JP2013001481A (ja) エレベータの油入緩衝器
JPH04217577A (ja) エレベータ用油入緩衝器
KR101762296B1 (ko) 개량된 쿠션구조를 갖는 복동형 유압 실린더
JP2005098424A (ja) 油入式緩衝装置
KR20070032937A (ko) 엘리베이터용 완충 장치
JP2007010160A (ja) 油圧緩衝器
CN106395550A (zh) 电梯用液压油缸缓冲塞
KR101283897B1 (ko) 엘리베이터용 다단식 유압 완충기
JP2001192185A (ja) 緩衝装置
CN103523634B (zh) 电梯用缓冲器及其控制方法
JPH0544633A (ja) ガス増圧器
HK1136540B (en) Hydraulic buffer for elevator
JP2007132503A (ja) 減速装置付き油圧シリンダ

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20090326

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

DAX Request for extension of the european patent (deleted)
A4 Supplementary search report drawn up and despatched

Effective date: 20130723

RIC1 Information provided on ipc code assigned before grant

Ipc: B66B 5/28 20060101AFI20130717BHEP

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20140220