WO2007075225A1 - Procede d'etalonnage et de reglage d'un dispositif de pesee pour ascenseur - Google Patents

Procede d'etalonnage et de reglage d'un dispositif de pesee pour ascenseur Download PDF

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Publication number
WO2007075225A1
WO2007075225A1 PCT/US2006/043971 US2006043971W WO2007075225A1 WO 2007075225 A1 WO2007075225 A1 WO 2007075225A1 US 2006043971 W US2006043971 W US 2006043971W WO 2007075225 A1 WO2007075225 A1 WO 2007075225A1
Authority
WO
WIPO (PCT)
Prior art keywords
car
load cell
weighing device
output
adjustment
Prior art date
Application number
PCT/US2006/043971
Other languages
English (en)
Inventor
Mitsuru Kato
Kensaku Yamane
Mitsuhiro Ichihara
Original Assignee
Otis Elevator Company
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 Otis Elevator Company filed Critical Otis Elevator Company
Publication of WO2007075225A1 publication Critical patent/WO2007075225A1/fr

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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
    • B66B5/0087—Devices facilitating maintenance, repair or inspection tasks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
    • B66B1/3476—Load weighing or car passenger counting devices
    • B66B1/3484—Load weighing or car passenger counting devices using load cells

Definitions

  • the present invention relates to a method of adjusting an elevator weighing device.
  • the present invention pertains to a method of adjusting a weighing device for a traction type rope elevator.
  • An elevator weighing device has a load cell that generates an output corresponding to the load applied to the car.
  • the device stores the output characteristics of the load cell and computes the load from the value output by the load cell. Because of variation over years, however, there may be changes in the output characteristics of the load cell. As a result, to maintain the performance of the weighing device, the load cell must be appropriately adjusted.
  • the weighing device is adjusted by applying a prescribed load to the load cell and reading the output value of the load cell so that the output characteristics of the load cell can be measured and compared to the value associated with the prescribed load. These output characteristics are stored in the weighing device.
  • the car and the pit floor are connected via an adjustment load cell such that the car is fixed, and the output of the adjustment load cell is monitored while the hoist motor is used to pull the car upward, so that a prescribed load is applied to the load cell of the weighing device.
  • the adjustment load cell has to be carried in/out of the pit each time the weighing device is adjusted, thereby creating a complicated transporting operation.
  • the adjustment load cell is expensive and as it is necessary to perform regular calibration to maintain the measurement precision, the costs associated with this approach are heightened.
  • the car is fixed on the guide rail at the middle of the lift process such that the inherent weight of the principal rope from the hoist to the car and the inherent weight of the principal rope from the hoist to the counterweight are equal to each other. Then, the braking force of the brake is released so that the car is pulled upward by the counterweight and a load is applied to the load cell.
  • the weight of the counterweight is set to be equal to the weight of the car with a prescribed ballast load applied, after the release of the braking force, the same load as that when the ballast load is applied to the car is applied to the load cell.
  • the output characteristics of the load cell are computed based on the balance load that is preset.
  • the present invention aims to resolve one or more of the aforementioned issues that afflict conventional elevator weighing methods and devices. Specifically, the present invention aims to provide a method of adjusting an elevator weighing device that reduces the costs associated with the use of a test weight, adjustment load cell, and/or other special devices.
  • An embodiment of the invention addresses a method of adjusting an elevator weighing device of an elevator car that is positioned in a hoistway and that is connected to a counterweight by a rope that is provided on a hoist that includes a brake for stopping the car, wherein the car includes a load cell that generates an output that corresponds to a load carried in the car.
  • This method includes, among other possible steps: (a) performing a pre-measurement for the weighing device using a first connecting member that includes an adjustment load cell, wherein the first connecting member is connected to the car and to the hoistway, said step of performing a pre-measurement for the weighing device yielding an initial offset and an initial gain; (b) performing an adjustment for the weighing device using a second connecting member that is connected to the car and to the hoistway, said step of performing an adjustment for the weighing device yielding a revised offset and a revised gain; and (c) overwriting the stored initial offset and initial gain with the revised offset and revised gain.
  • the step of performing a pre-measurement for the weighing device may include the steps of: (i) obtaining a first output of the car load cell; (ii) stopping the car, using the brake, with the car suspended on one end of the rope and with the counterweight suspended on the other end of the rope; (iii) connecting the car and the hoistway using the first connecting member; (iv) obtaining a second output of the car load cell; (v) obtaining a first output of the adjustment load cell; (vi) releasing the brake; (vii) obtaining a third output of the car load cell; (viii) obtaining a second output of the adjustment load cell; (ix) determining and storing the initial offset for the weighing device; and (x) determining and storing the initial gain for the weighing device from the second and third outputs of the car load cell and the first and second outputs of the adjustment load cell.
  • the step of performing an adjustment for the weighing device may include the steps of: (xi) obtaining a fourth output of the load cell; (xii) stopping the car, using the brake, with the car suspended on one end of the rope and with the counterweight suspended on the other end of the rope; (xiii) connecting the car and the hoistway using the second connecting member; (xiv) obtaining a fifth output of the car load cell; (xv) releasing the brake; (xvi) obtaining a sixth output of the car load cell; (xvii) determining the revised offset for the weighing device; and (xviii) determining the revised gain for the weighing device from the fifth and sixth outputs of the car load cell and the first and second outputs of the adjustment load cell.
  • the initial offset may be determined to be the first output of the car load cell.
  • the initial gain may be determined by dividing the difference between the second and third outputs of the car load cell by the difference between the first and second outputs of the adjustment load cell.
  • the revised offset may be determined to be the fourth output of the car load cell.
  • the revised gain may be determined by dividing the difference between the fifth and sixth outputs of the car load cell by the difference between the first and second outputs of the adjustment load cell.
  • the first connecting member may be connected to a lower portion of the car and to a pit floor of the hoistway.
  • the second may be connected to a lower portion of the car and to a pit floor of the hoistway.
  • connecting member may be connected to a lower portion of the car and to a pit floor of the hoistway.
  • the step of obtaining a first output of the car load cell may be performed while the car is unloaded.
  • the step of obtaining a fourth output of the car load cell may be performed while the car is unloaded.
  • the step of obtaining a first output of the car load cell may be performed while the car is located at a lower end of the hoistway.
  • the step of obtaining a fourth output of the car load cell may be performed while the car is located at a lower end of the hoistway.
  • the step of performing a pre-measurement may be performed during initial adjustment of the weighing device.
  • FIG. 1 is a schematic diagram illustrating an embodiment of an elevator, which includes a load cell, according to the present invention
  • Figure 2 is a graph illustrating the output characteristics of the load cell shown in Figure 1;
  • Figure 3 is a flow chart illustrating an embodiment of an initial adjustment procedure for the weighing device shown in Figure 1 ; .
  • Figure 4 is a schematic diagram illustrating the elevator of Figure 1, when the weighing device is initially being adjusted;
  • Figure 5 is a flow chart illustrating an embodiment of a subsequent adjustment procedure for the weighing device shown in Figure 1;
  • Figure 6 is a schematic diagram illustrating the elevator of Figure 1, with the weighing device being subsequently adjusted.
  • FIG. 1 is a schematic diagram illustrating an embodiment of an elevator, which includes a load cell, according to the present invention.
  • the elevator is a traction rope type elevator.
  • a hoist 1 has a hoist motor 2, a brake 3, a driving sheave 4, and a driving shaft 9.
  • a principal rope 6 runs over the driving sheave 4 and a deflector wheel 5 that is arranged near the driving sheave 4.
  • One end of the principal rope 6 is connected to a car 7 (which is suspended on the rope 6) and the other end of the principal rope 6 is connected to a counterweight 8 (which is also suspended on the rope 6).
  • the power of the hoist motor 2 is transferred via the driving shaft 9 to the driving sheave 4.
  • the brake 3 can apply a braking force to stop the rotation of the driving shaft 9 so that the car 7 and the counterweight 8 are stopped.
  • the weight of the counterweight 8 is selected such that when a prescribed load is applied to car 7, the counterweight 8 has the same weight as that of the loaded car 7. In other words, the weight of the counterweight 8 is greater than the unloaded weight of the car 7. Consequently, when the car 7 is unloaded and is stopped by the braking force of the brake 3, to prevent an upward movement of the car 7, the brake 3 stops the driving shaft 9 from being rotated towards the side of the counterweight 8.
  • a load cell 10 is included between the principal rope 6 and the car 7.
  • the load placed on the car 7 is applied to the load cell 10.
  • the load cell 10 generates a voltage output nearly proportional to the load placed on the car 7; this output is sent to a weighing control part 11.
  • a weighing device 12 is composed of the load cell 10 and the weighing control part 11.
  • Figure 2 is a graph illustrating the output characteristics of the load cell shown in Figure 1. More specifically, the output voltage of the load cell 10 linearly increases along an ,
  • the slope of the output characteristics line (a) represents a gain coefficient G.
  • the output voltage Vo of the load cell 10 has an offset value O. Consequently, the weighing control part 11 has a gain coefficient G and an offset value O, both of which are stored as the output characteristics of the load cell 10.
  • the gain coefficient G and the offset value O are stored in an output characteristics storage part 11a, which is part of the weighing control part 11.
  • the load applied to the car 7 is computed by a load computing part 1 Ib, which is also part of the weighing control part 11.
  • the load computing part 1 Ib performs the prescribed control and outputs the computed load applied to the car 7 to a principal control part 13.
  • the principal control part 13 controls the operation of the driving motor 2 and the brake 3. Based on the computed load applied to the car 7, the control part 13 drives and stops the car 7 smoothly. Further, when the load exceeds a maximum load, the control part 13 may generate an alarm and/or stop operation.
  • the output characteristics storage part lla stores the gain coefficient G and the offset value O after an initial adjustment is performed when the elevator is installed.
  • the initial adjustment is performed as follows with reference to Figures 3 and 4.
  • Figures 3 and 4 illustrate an embodiment of a method of initial adjustment of the weighing device shown in Figure 1.
  • Figure 3 is a flow chart illustrating an embodiment of an initial adjustment procedure for the weighing device shown in Figure 1.
  • Figure 4 is a schematic diagram illustrating the elevator of Figure 1, when the weighing device is initially being adjusted.
  • step Sl the unloaded car 7 is stopped.
  • step S2 the output voltage Vo of load cell 10 in this state is read.
  • step S3 a lower portion of the car 7 and the pit floor 14 of the building itself are connected to each other by a connecting chain 15, as shown in Figure 4.
  • the connecting chain 15 serves as a first connecting member with an adjustment load cell 15a included in the middle thereof.
  • the car 7 is fixed to the pit floor 14 at a prescribed position near the lower end of the hoistway such that upward movement of the car 7 is restricted.
  • eyebolts may be screwed into the lower portion of the car 7 and the pit floor 14, respectively. Hooks may then be attached .
  • step S4 While the car 7 is fixed to the pit floor 14, the output voltage Vl of load cell 10 is read in step S4. At the same time, in step S5, a load Pl applied to the adjustment load cell 15a is measured and the adjustment load cell 15a is pre-calibrated. Then, in step S6, the braking force of brake 3 is released. After the release of the braking force, the output voltage V2 of the load cell 10 is read is in step S7. At the same time, the load P2 applied to the adjustment load cell 15a is also measured in step S8.
  • the change in the output voltage ⁇ V of the load cell 10 is determined as follows: ⁇ v * V 2 — V 1 Consequently, the gain coefficient G of the load cell 10 is computed as follows:
  • the output voltage Vo becomes the offset value O of the load cell 10 plus the gain G multiplied by the load.
  • the load computing part 1 Ib can compute the ,
  • FIG. 5 illustrates an embodiment of a method of adjusting the weighing device 12.
  • Figure 5 is a flow chart illustrating an embodiment of a subsequent adjustment procedure for the weighing device shown in Figure 1.
  • Figure 6 is a schematic diagram illustrating the elevator of Figure 1, with the weighing device being subsequently adjusted.
  • an adjustment of the weighing device 12 may be performed using nearly the same procedure as the initial adjustment.
  • the pulling force ⁇ P is established in a pre-measurement step in the initial adjustment, there is no need to use the adjustment load cell 15a. Consequently, as shown in Figure 6, a connecting chain 16 is used without an adjustment load cell.
  • the connecting chain 16 serves as a second connecting member for connecting the car 7 and the pit floor 14.
  • An adjustment of the weighing device 12 is performed as follows. [0041] As shown in Figure 5, in step S21, the unloaded car is stopped in a lower portion of the hoistway. Then, the output voltage Vo of the load cell 10 is read in step S22.
  • step S23 the car 7 is fixed to pit floor 14 at the prescribed position (possibly in the manner previous described with respect to step S3 in Figure 4 but without an adjustment load cell) by connecting the lower portion of the car 7 to the pit floor 14 with the connecting chain 16.
  • the output voltage V3 of the load cell 10 is read in step S24.
  • the braking force of the brake 3 is released in step S25 and the output voltage V4 of the load cell 10 is thereafter read in step S26.
  • steps S27 and S28 a revised offset value O' and a revised gain coefficient G' of the load cell 10 are determined using the pulling force ⁇ P that was previously measured in the initial adjustment.
  • step S29 the offset value O and the gain coefficient G that were previously stored in the output characteristics storage part 1 Ia are replaced by the revised values O' and G'.
  • the load computing part 1 Ib may compute the load applied to the car 7 based on the offset value O and the gain coefficient G of the load cell 10. Also, when the weighing device 12 needs to be adjusted (after the previous adjustment of weighing device 12), an adjustment of weighing device 12 may be performed in the same way as aforementioned.
  • the braking force of the brake 3 may be released while the car 7 and the pit floor 14 are connected to each other. Consequently, by pre-measuring the pulling force ⁇ P, there is no need to use a special device to adjust the weighing device 12 and, therefore, adjusting the weighing device 12 advantageously becomes both easier and cheaper.
  • the aforementioned method also presents additional advantages. For example, as the weight on the side of the counterweight is used to apply a load to the load cell 10, the reproducibility of the loading condition on the load cell 10 is good. In addition, as the car 7 is connected to the pit floor 14 at the lower end of the hoistway, the connection operation can be performed safely in the pit. hi addition, there is no need to use a specific device after measuring the pulling force and, therefore, the worker can perform the operation safely, more easily and at lower cost.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Elevator Control (AREA)

Abstract

Cette invention concerne un procédé de réglage d'un dispositif de pesée pour ascenseur (12) destiné à améliorer l'opérabilité d'un ascenseur tout en réduisant les coûts. Une fois la cabine fixée au le fond du puits (14) via une cellule de charge de réglage (15a), on libère une force de freinage. Par suite du poids qui s'exerce sur un côté du contrepoids (8), une force de traction tire la cabine (7) vers le haut, cette force de traction vers le haut étant mesurée à l'aide de la cellule de charge de réglage. Lorsque le dispositif de pesée est réglé, la cabine est fixée au fond du puits par une chaîne et la force de freinage du frein (3) est libérée. Par voie de conséquence, la force de traction vers le haut s'exerce sur la cellule de charge (10) du dispositif de pesée. On détermine un coefficient de gain et une valeur de correction en fonction de la valeur produite par la cellule de charge. Les caractéristiques de sortie du dispositif de pesée sont stockées dans un module de stockage spécifique (11a).
PCT/US2006/043971 2005-12-20 2006-11-13 Procede d'etalonnage et de reglage d'un dispositif de pesee pour ascenseur WO2007075225A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005365701A JP2007168938A (ja) 2005-12-20 2005-12-20 エレベータの秤装置の調整方法
JP2005-365701 2005-12-20

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8162110B2 (en) 2008-06-19 2012-04-24 Thyssenkrupp Elevator Capital Corporation Rope tension equalizer and load monitor
CN103449272A (zh) * 2013-10-08 2013-12-18 苏州德奥电梯有限公司 电梯轿厢
WO2015040251A1 (fr) * 2013-09-23 2015-03-26 Dinacell Electrónica, S.L. Procédé et agencement d'étalonnage du système de commande de charge d'un ascenceur
WO2017098077A1 (fr) * 2015-12-07 2017-06-15 Kone Corporation Procédé et dispositif pour tester les structures de cabine d'un ascenseur et/ou pour ajuster un dispositif de pesée de charge
US20200346892A1 (en) * 2019-05-03 2020-11-05 Otis Elevator Company Method and apparatus for detecting the position of an elevator
DE102022104832A1 (de) 2022-03-01 2023-09-07 Henning Testing Systems Gmbh Verfahren zur Überprüfung wenigstens eines sicherheitsrelevanten Kennwerts einer Aufzugsanlage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6472393B2 (ja) * 2016-01-12 2019-02-20 株式会社日立ビルシステム エレベーターの負荷検出調整装置及びエレベーター
KR20190051063A (ko) 2016-11-01 2019-05-14 미쓰비시덴키 가부시키가이샤 엘리베이터 장치, 및 저울 장치의 교정 방법

Citations (4)

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Publication number Priority date Publication date Assignee Title
US5407030A (en) * 1993-03-04 1995-04-18 Otis Elevator Company Recalibrating an elevator loadweighing system
JPH1036026A (ja) * 1996-07-17 1998-02-10 Hitachi Building Syst Co Ltd エレベータ秤装置の検定装置
JP2004099303A (ja) * 2002-09-12 2004-04-02 Mitsubishi Electric Building Techno Service Co Ltd エレベータの秤装置の調整方法
JP2005145620A (ja) * 2003-11-13 2005-06-09 Mitsubishi Electric Building Techno Service Co Ltd エレベーター秤装置特性測定システム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5407030A (en) * 1993-03-04 1995-04-18 Otis Elevator Company Recalibrating an elevator loadweighing system
JPH1036026A (ja) * 1996-07-17 1998-02-10 Hitachi Building Syst Co Ltd エレベータ秤装置の検定装置
JP2004099303A (ja) * 2002-09-12 2004-04-02 Mitsubishi Electric Building Techno Service Co Ltd エレベータの秤装置の調整方法
JP2005145620A (ja) * 2003-11-13 2005-06-09 Mitsubishi Electric Building Techno Service Co Ltd エレベーター秤装置特性測定システム

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8162110B2 (en) 2008-06-19 2012-04-24 Thyssenkrupp Elevator Capital Corporation Rope tension equalizer and load monitor
WO2015040251A1 (fr) * 2013-09-23 2015-03-26 Dinacell Electrónica, S.L. Procédé et agencement d'étalonnage du système de commande de charge d'un ascenceur
CN105658559A (zh) * 2013-09-23 2016-06-08 迪娜赛乐电子公司 用于校正电梯的负载控制***的方法和配置
RU2627949C1 (ru) * 2013-09-23 2017-08-14 Динаселл Электроника, С.Л. Способ автоматического управления
US10239727B2 (en) 2013-09-23 2019-03-26 Dinacell Electronica, S.L. Method and arrangement for control and evaluation of the operation of a lift
CN103449272A (zh) * 2013-10-08 2013-12-18 苏州德奥电梯有限公司 电梯轿厢
WO2017098077A1 (fr) * 2015-12-07 2017-06-15 Kone Corporation Procédé et dispositif pour tester les structures de cabine d'un ascenseur et/ou pour ajuster un dispositif de pesée de charge
CN108367884A (zh) * 2015-12-07 2018-08-03 通力股份公司 用于测试电梯的轿厢结构和/或调节负载称重设备的方法和装置
EP3386898A4 (fr) * 2015-12-07 2019-07-24 Kone Corporation Procédé et dispositif pour tester les structures de cabine d'un ascenseur et/ou pour ajuster un dispositif de pesée de charge
CN108367884B (zh) * 2015-12-07 2020-11-10 通力股份公司 用于测试电梯的轿厢结构和/或调节负载称重设备的方法和装置
US20200346892A1 (en) * 2019-05-03 2020-11-05 Otis Elevator Company Method and apparatus for detecting the position of an elevator
DE102022104832A1 (de) 2022-03-01 2023-09-07 Henning Testing Systems Gmbh Verfahren zur Überprüfung wenigstens eines sicherheitsrelevanten Kennwerts einer Aufzugsanlage

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