EP1478591A1 - Elevator load weighing device - Google Patents

Elevator load weighing device

Info

Publication number
EP1478591A1
EP1478591A1 EP02706477A EP02706477A EP1478591A1 EP 1478591 A1 EP1478591 A1 EP 1478591A1 EP 02706477 A EP02706477 A EP 02706477A EP 02706477 A EP02706477 A EP 02706477A EP 1478591 A1 EP1478591 A1 EP 1478591A1
Authority
EP
European Patent Office
Prior art keywords
measuring apparatus
mounting plate
load
hoistway
load cell
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
EP02706477A
Other languages
German (de)
French (fr)
Other versions
EP1478591A4 (en
EP1478591B1 (en
Inventor
Dale Barrett
Nizar Dassouki
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.)
Otis Elevator Co
Original Assignee
Otis Elevator Co
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 Co filed Critical Otis Elevator Co
Publication of EP1478591A1 publication Critical patent/EP1478591A1/en
Publication of EP1478591A4 publication Critical patent/EP1478591A4/en
Application granted granted Critical
Publication of EP1478591B1 publication Critical patent/EP1478591B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • B66B7/08—Arrangements of ropes or cables for connection to the cars or cages, e.g. couplings
    • 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
    • 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
    • B66B5/14—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions in case of excessive loads

Definitions

  • This invention relates to a method and apparatus for measuring the load of an elevator car and more particularly for measuring the load at on each tension member.
  • U.S. Patent 6,021 ,873 describes a load measurement device located at the dead end hitch.
  • the tension member terminations are mounted to a bracket, which is in turn mounted to a plate.
  • the plate is attached to a guiderail to fix the tension members relative to the hoistway.
  • An edge flange is attached to the plate opposite the guiderails and a strain gauge is attached to the flange.
  • the load exerted by the car suspended by the tension members is transmitted by the plate to the edge flange which is designed such that the force applied to the edge plate by the hoisting ropes causes a large deformation in the edge flange.
  • the strain in the edge flange is measured by the strain gauge.
  • Japanese patent application 6-255933 describes a load measuring device located at the dead end hitch.
  • the rope terminations pass through a lower plate fixed to a hoistway beam.
  • the rope terminations are fixed to an upper plate, which is pivotally fixed to the lower plate.
  • a load cell is positioned between the upper and lower plates. The load of the car is transmitted through the tension members, to the rope terminations, to the upper plate, forcing it to rotate toward the lower plate thus exerting a force on the load cell proportional to the weight of the car.
  • the prior art load measurement systems require not only mounting structure but also provisions for transferring the load from the mounting structure to the load measuring device.
  • the object of the invention is to provide an improved method and apparatus for measuring the load of an elevator.
  • a further object of the present invention is to provide a method and apparatus for measuring the load on each tension member of an elevator installation.
  • a load weighing device for an elevator is located at the termination of a tension member for suspending the elevator car.
  • a typical elevator system includes an elevator car and counterweight suspended by a tension member such as a steel or synthetic rope or flat belt.
  • the tension member is driven by a machine to position the car and counterweight within a hoistway.
  • the tension member is fixed within the hoistway at its first and second ends within the hoistway.
  • Terminations are fixed to the end of the tension member which are in turn attached to a structure such as a mounting plate or beam that is fixed relative the hoistway.
  • the termination typically consists of a threaded rod which extends through an opening in the beam of mounting plate.
  • a spring of buffer is placed over the rod. The spring is held in place between the beam and the end of the rod by a series of washers and nuts.
  • a load cell is fixed between the spring and an upper surface of the mounting plate and spring such that the load cell measures the weight borne by the tension member.
  • a self-aligning washer is fitted between the end of the spring and the load cell. This maintains the tension member in a position normal to the load cell to distribute the load evenly across the load cell.
  • FIG. 1 is a schematic of an elevator installation according to the present invention.
  • FIG. 2 is a plan view of a load weighing apparatus according to the present invention
  • Fig. 3 is a plan view of the spherical washer.
  • an elevator system 10 includes a load measuring device 12 as shown in Figure 1.
  • the elevator system includes 10 an elevator car 14, which is positioned within a hoistway 16 by a machine 18.
  • the machine 18 is shown at the top of the hoistway 16 mounted on a machine beam 20.
  • the exact location of the machine 18 is not critical to the operation of the load weighing device 12.
  • the car is guided within the hoistway on guide rails 22.
  • a counterweight 24 serves to balance the load of the elevator car 14.
  • the counterweight is guided within the hoistway on a second set of guide rails 26.
  • Tension members 28 suspend the counterweight 24 and car 14.
  • the tension members 28 are driven by the machine 18, which in turn controls the position of the car 14 and counterweight 24.
  • the tension members 28 may consist of multiple ropes or flat belts.
  • the tension members 28 are usually fixed at a first 30 and second 32 end.
  • An anchorage 34 incorporating the load measuring device 12 is shown in Fig. 2.
  • the tension members 28 are attached to terminations 36.
  • the terminations 36 include a rod 38 having a threaded end 40. The rod extends through a mounting plate 42.
  • the mounting plate 42 is designed for minimal deflection and may be fixed to a guiderail 22, machine beam 20, the wall of the hoistway, or any other structure suitable to support the weight of the car 14. In the alternative the mounting plate 42 may be eliminated and the terminations attached directly to the machine beam 20 or other suitable structure.
  • the spring 44 is held in place between the upper surface 46 of the mounting plate 42 and a washer 48 by a first nut 50, a lock nut 52 and cotter pin 54.
  • a load cell 56 is located between spring 44 and the upper surface 46 of the mounting plate 42.
  • a washer 58 is fitted between the load cell 56 and the spring 44 to evenly distribute the load over the load cell 56.
  • the load cell 56 has an annular shape defining a hole through which the rod 38 passes.
  • the load cell 56 is conventional consisting of a bonded foil stranded and full bridge (not shown), which produces an electrical signal proportional to the load.
  • the signal from each load cell 56 is summed together to obtain the total load.
  • the signals may also be analyzed individually to determine the portion of the load carried by each tension member.
  • the springs 44 may be adjusted by either tightening or loosening the nuts 50 and 52 to equalize the load carried by each tension member 28.
  • the load in each tension member 28 individually, any stretching of degradation of the tension members 28 can also be sensed as the loads carried by each tension member 28 varies over time.
  • a spherical washer 60 which consists of an upper portion 62a and a lower portion 62b.
  • the upper portion has a flat upper surface 64a which interfaces with the spring 44 and convex lower surface 64b which interfaces with a concave upper surface 66a of the lower portion 62b.
  • the lower portion 62b has a flat lower surface 66b which interfaces with the upper surface 46 of the mounting plate 42.
  • the interaction of the convex lower surface 64a and the concave upper surface 66b distributes the load evenly over the load cell 56. Even distribution of the load minimizes any errors that can occur detecting the load applied.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
  • Elevator Control (AREA)

Abstract

An improved measuring device for measuring the load of an elevator including a car suspended by a tension member within a hoistway, a termination (36) at one end of the tension member (28), a mounting plate (42) for attaching the termination relative the hoistway, and a hitch (38) for attaching the termination to the mounting plate further including load cell (56) positioned between the hitch and the mounting plate wherein the load cell generates a signal proportional to the load of the car.

Description

Elevator Load Weighing Device Technical Field
[001] This invention relates to a method and apparatus for measuring the load of an elevator car and more particularly for measuring the load at on each tension member.
Background Art
[002] U.S. Patent 6,021 ,873 describes a load measurement device located at the dead end hitch. The tension member terminations are mounted to a bracket, which is in turn mounted to a plate. The plate is attached to a guiderail to fix the tension members relative to the hoistway. An edge flange is attached to the plate opposite the guiderails and a strain gauge is attached to the flange. The load exerted by the car suspended by the tension members is transmitted by the plate to the edge flange which is designed such that the force applied to the edge plate by the hoisting ropes causes a large deformation in the edge flange. The strain in the edge flange is measured by the strain gauge.
[003] Japanese patent application 6-255933 describes a load measuring device located at the dead end hitch. The rope terminations pass through a lower plate fixed to a hoistway beam. The rope terminations are fixed to an upper plate, which is pivotally fixed to the lower plate. A load cell is positioned between the upper and lower plates. The load of the car is transmitted through the tension members, to the rope terminations, to the upper plate, forcing it to rotate toward the lower plate thus exerting a force on the load cell proportional to the weight of the car.
[004] The prior art load measurement systems require not only mounting structure but also provisions for transferring the load from the mounting structure to the load measuring device.
[005] The prior art also provides a measurement of the total load as opposed to the load on each tension member [006] Therefore there exists a need for an improved simplified load measuring apparatus that eliminates the need for complex mounting provisions and provides load measurements for individual tension members.
Disclosure of Invention
[007] The object of the invention is to provide an improved method and apparatus for measuring the load of an elevator.
[008] A further object of the present invention is to provide a method and apparatus for measuring the load on each tension member of an elevator installation.
[009] According to the present invention, a load weighing device for an elevator is located at the termination of a tension member for suspending the elevator car. A typical elevator system includes an elevator car and counterweight suspended by a tension member such as a steel or synthetic rope or flat belt. The tension member is driven by a machine to position the car and counterweight within a hoistway. The tension member is fixed within the hoistway at its first and second ends within the hoistway.
[010] Terminations are fixed to the end of the tension member which are in turn attached to a structure such as a mounting plate or beam that is fixed relative the hoistway. The termination typically consists of a threaded rod which extends through an opening in the beam of mounting plate. A spring of buffer is placed over the rod. The spring is held in place between the beam and the end of the rod by a series of washers and nuts.
[011] According to the present invention a load cell is fixed between the spring and an upper surface of the mounting plate and spring such that the load cell measures the weight borne by the tension member. For elevators having multiple tension members, there is a load cell for each tension member.
[012] In a further embodiment of the present invention a self-aligning washer is fitted between the end of the spring and the load cell. This maintains the tension member in a position normal to the load cell to distribute the load evenly across the load cell. Brief Description of the Drawings
[013] Fig. 1 is a schematic of an elevator installation according to the present invention.
[014] Fig. 2 is a plan view of a load weighing apparatus according to the present invention
[015] Fig. 3 is a plan view of the spherical washer.
Best Mode for Carrying Out the Invention
[016] According to the present invention, an elevator system 10 includes a load measuring device 12 as shown in Figure 1. The elevator system includes 10 an elevator car 14, which is positioned within a hoistway 16 by a machine 18. The machine 18 is shown at the top of the hoistway 16 mounted on a machine beam 20. However, the exact location of the machine 18 is not critical to the operation of the load weighing device 12.
[017] The car is guided within the hoistway on guide rails 22. A counterweight 24 serves to balance the load of the elevator car 14. The counterweight is guided within the hoistway on a second set of guide rails 26. Tension members 28 suspend the counterweight 24 and car 14. The tension members 28 are driven by the machine 18, which in turn controls the position of the car 14 and counterweight 24. The tension members 28 may consist of multiple ropes or flat belts.
[018] The tension members 28 are usually fixed at a first 30 and second 32 end. An anchorage 34 incorporating the load measuring device 12 is shown in Fig. 2. The tension members 28 are attached to terminations 36. The terminations 36 include a rod 38 having a threaded end 40. The rod extends through a mounting plate 42.
[019] The mounting plate 42 is designed for minimal deflection and may be fixed to a guiderail 22, machine beam 20, the wall of the hoistway, or any other structure suitable to support the weight of the car 14. In the alternative the mounting plate 42 may be eliminated and the terminations attached directly to the machine beam 20 or other suitable structure. [020] It is known in the art to fit a spring or buffer 44 over the rod 38. The spring 44 is held in place between the upper surface 46 of the mounting plate 42 and a washer 48 by a first nut 50, a lock nut 52 and cotter pin 54. According to the present invention a load cell 56 is located between spring 44 and the upper surface 46 of the mounting plate 42. A washer 58 is fitted between the load cell 56 and the spring 44 to evenly distribute the load over the load cell 56. The load cell 56 has an annular shape defining a hole through which the rod 38 passes.
[021] A portion of the weight of the car 14, and its contents is borne by each tension member 28. This portion of the weight is sensed by the corresponding load cell 56, which is compressed between the spring 44 and upper surface 46 in proportion to the load.
[022] The load cell 56 is conventional consisting of a bonded foil stranded and full bridge (not shown), which produces an electrical signal proportional to the load. The signal from each load cell 56 is summed together to obtain the total load. The signals may also be analyzed individually to determine the portion of the load carried by each tension member.
[023] By measuring the load on each tension member 28, the springs 44 may be adjusted by either tightening or loosening the nuts 50 and 52 to equalize the load carried by each tension member 28. By measuring the load in each tension member 28, individually, any stretching of degradation of the tension members 28 can also be sensed as the loads carried by each tension member 28 varies over time.
[024] In a second embodiment of the present invention a spherical washer 60 which consists of an upper portion 62a and a lower portion 62b. The upper portion has a flat upper surface 64a which interfaces with the spring 44 and convex lower surface 64b which interfaces with a concave upper surface 66a of the lower portion 62b. The lower portion 62b has a flat lower surface 66b which interfaces with the upper surface 46 of the mounting plate 42. [025] The interaction of the convex lower surface 64a and the concave upper surface 66b distributes the load evenly over the load cell 56. Even distribution of the load minimizes any errors that can occur detecting the load applied.
[026] The foregoing description is exemplary rather than defined by the limitations within. Many modifications and variations of the present invention are possible in light of the above teachings. The preferred embodiments of this invention have been disclosed, however, one of ordinary skill in the art would recognize that certain modifications would come within the scope of this invention. It is, therefore, to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described. For that reason the following claims should be studied to determine the true scope and content of this invention.

Claims

ClaimsI claim:
1. A measuring apparatus for measuring the load of an elevator including a car suspended by a tension member within a hoistway, a termination at one end of the tension member, a mounting plate for attaching the termination relative the hoistway, and a hitch for attaching the termination to the mounting plate, the apparatus comprising: a load cell positioned between the hitch and the mounting plate wherein the load cell generates a signal proportional to the load and wherein the load cell defines a hole for allowing the termination to pass therethrough.
2. The measuring apparatus of claim 1 wherein the load cell comprises an annular shape
3. The measuring apparatus of claim 2 further comprising a self-aligning washer located between the hitch and the load cell to maintain the hitch in a position normal to the load cell.
4. The measuring apparatus of claim 3 wherein the self-aligning washer is spherical in shape.
5. The measuring apparatus of claim 1 wherein the elevator car is adapted to move along a guiderail positioned in the hoistway, and wherein the mounting plate is fixed to the guiderail.
6. The measuring apparatus of claim 1 further includes a beam locating at the top of the hoistway and wherein the mounting plate is attached to the beam.
7. The measuring apparatus of claim 1 wherein the hoistway is defined by an elevator shaft and the mounting plate is attached to the elevator shaft.
8. The measuring apparatus of claim 6 wherein the termination is attached to the beam.
9. A measuring apparatus for measuring the load of an elevator including a car suspended by plurality of tension members within a hoistway, and a termination at one end of each of the plurality of tension members, the apparatus comprising: a mounting plate for attaching the plurality of terminations relative the hoistway, a plurality of hitches for attaching each of the plurality of terminations to the mounting plate; and multiple load cell positioned between each of the plurality of hitches and the mounting plate wherein each load cell generates a signal proportional to the load.
10. The measuring apparatus of claim 9 wherein each load cell defines a hole for allowing an associated termination to pass therethrough.
11. The measuring apparatus of claim 10 further comprising multiple self- aligning washers located between an associated hitch and load cell to maintain the hitch in a position normal to the load cell.
12. The measuring apparatus of claim 11 wherein each of the self-aligning washers is spherical in shape.
13. The measuring apparatus of claim 9 wherein the elevator car is adapted to move along a guiderail positioned in the hoistway, and wherein the mounting plate is fixed to the guiderail.
14. The measuring apparatus of claim 9 further includes a beam locating at the top of the hoistway and wherein the mounting plate is attached to the beam.
15. The measuring apparatus of claim 9 wherein the hoistway is defined by an elevator shaft and the mounting plate is attached to the elevator shaft.
16. The measuring apparatus of claim 14 wherein the termination is attached to the beam.
EP02706477A 2002-02-28 2002-02-28 Elevator load weighing device Expired - Lifetime EP1478591B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2002/006216 WO2003074406A1 (en) 2002-02-28 2002-02-28 Elevator load weighing device

Publications (3)

Publication Number Publication Date
EP1478591A1 true EP1478591A1 (en) 2004-11-24
EP1478591A4 EP1478591A4 (en) 2008-09-03
EP1478591B1 EP1478591B1 (en) 2009-12-09

Family

ID=27787369

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02706477A Expired - Lifetime EP1478591B1 (en) 2002-02-28 2002-02-28 Elevator load weighing device

Country Status (8)

Country Link
EP (1) EP1478591B1 (en)
JP (1) JP4102760B2 (en)
KR (1) KR100872220B1 (en)
CN (1) CN100366519C (en)
AU (1) AU2002240562A1 (en)
DE (1) DE60234718D1 (en)
ES (1) ES2337659T3 (en)
WO (1) WO2003074406A1 (en)

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EP1792868A4 (en) * 2004-09-24 2012-01-18 Mitsubishi Electric Corp ELEVATOR WITHOUT MACHINE ROOM
JP4929785B2 (en) * 2006-03-28 2012-05-09 三菱電機株式会社 Elevator control cable device
CN102765648B (en) * 2011-05-05 2014-10-22 上海三菱电梯有限公司 Tension measuring and adjusting device for suspension rope of elevator
CN103072872A (en) * 2011-10-25 2013-05-01 康力电梯股份有限公司 Rope end hanging plate device
CN103708320B (en) * 2012-10-08 2015-10-07 上海力夏检测技术有限公司 A kind of portable multi rope winding system rope tension equilibrium instrument
CN102910514B (en) * 2012-11-01 2015-03-04 日立电梯（中国）有限公司 Elevator car weighing system and weighing method
JP6170810B2 (en) * 2013-10-29 2017-07-26 株式会社日立ビルシステム Elevator main rope tension measuring device and elevator control system
ES2600869B1 (en) * 2015-07-10 2018-01-09 Dinacell Electrónica S.L. Load cell
ES1143983Y (en) * 2015-09-01 2015-12-16 Lift Sensor S L CABLE TENSION CONTROL DEVICE
CN105752781B (en) * 2015-12-15 2018-06-22 上海长江斯迈普电梯有限公司 Elevator intelligent weighing device and control method
EP3210924A1 (en) 2016-02-23 2017-08-30 Inventio AG Elevator connection assembly with strain gauge
ES2737842B2 (en) * 2017-05-26 2022-04-13 Tim Ebeling Suspension Member Equalization System for Elevators
US10618772B2 (en) * 2017-06-20 2020-04-14 Otis Elevator Company Elevator termination assembly that provides an indication of elevator car load
CN109250597A (en) * 2018-11-06 2019-01-22 广州绰立科技有限公司 Elevator car loading device antidote
CN110342364A (en) * 2019-07-26 2019-10-18 大连凯晟科技发展有限公司 A kind of elevator overload device to test instrument
WO2022003233A1 (en) * 2020-07-03 2022-01-06 Kone Corporation A tension member tension monitoring arrangement, a tension member tension monitoring method and an elevator
EP4588877A3 (en) 2020-08-26 2026-01-21 Appana Industries LLC Systems and methods for adjusting elevator load settings

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US5421422A (en) * 1993-11-19 1995-06-06 Boretec Inc Roller cutter mount for tunneling machine
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Also Published As

Publication number Publication date
DE60234718D1 (en) 2010-01-21
EP1478591A4 (en) 2008-09-03
JP4102760B2 (en) 2008-06-18
CN100366519C (en) 2008-02-06
KR100872220B1 (en) 2008-12-05
HK1076790A1 (en) 2006-01-27
AU2002240562A1 (en) 2003-09-16
JP2005519009A (en) 2005-06-30
KR20040084907A (en) 2004-10-06
EP1478591B1 (en) 2009-12-09
CN1622914A (en) 2005-06-01
WO2003074406A1 (en) 2003-09-12
ES2337659T3 (en) 2010-04-28

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