WO2021245855A1 - Dispositif de pesage de cabine d'ascenseur - Google Patents

Dispositif de pesage de cabine d'ascenseur Download PDF

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Publication number
WO2021245855A1
WO2021245855A1 PCT/JP2020/022014 JP2020022014W WO2021245855A1 WO 2021245855 A1 WO2021245855 A1 WO 2021245855A1 JP 2020022014 W JP2020022014 W JP 2020022014W WO 2021245855 A1 WO2021245855 A1 WO 2021245855A1
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WO
WIPO (PCT)
Prior art keywords
value
coil
voltage
exciting coil
core
Prior art date
Application number
PCT/JP2020/022014
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English (en)
Japanese (ja)
Inventor
将太郎 森
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2022529231A priority Critical patent/JP7276609B2/ja
Priority to PCT/JP2020/022014 priority patent/WO2021245855A1/fr
Publication of WO2021245855A1 publication Critical patent/WO2021245855A1/fr

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    • 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 disclosure relates to an elevator car weighing device.
  • Patent Document 1 discloses an elevator car weighing device.
  • the weighing device uses a differential transformer to measure the load weight inside the car.
  • An object of the present disclosure is to provide an elevator car weighing device capable of suppressing an error in a measured load due to a change in ambient temperature.
  • the elevator car weighing device is adjacent to a core that changes its position in conjunction with the elevator car floor, one exciting coil that forms a magnetic field by passing an electric current, and the one exciting coil.
  • the measuring coil is provided so as to surround a part of the core, and when the one exciting coil forms a magnetic field, the measurement coil in which the induced electromotive force is induced and the one adjacent to the exciting coil, the core is inside.
  • the temperature correction value is calculated using the reference coil in which the induced electromotive force is induced and the value of the reference voltage measured by the reference coil.
  • a first processing circuit is provided, wherein the sum of the value of the measured voltage measured by the measuring coil and the temperature corrected value is set as the value of the first corrected voltage.
  • the car weighing device of the elevator calculates the temperature correction value using the value of the reference voltage measured by the reference coil, and sets the value of the measured voltage measured by the measuring coil and the temperature correction value.
  • a first processing circuit having a sum as the value of the first correction voltage was provided. Therefore, it is possible to suppress an error in the measured load due to a change in the ambient temperature.
  • FIG. 3 is a block diagram of an elevator car weighing device according to the first embodiment.
  • FIG. 3 is a plan view of the elevator car weighing device according to the first embodiment. It is a flowchart for demonstrating the outline of operation at the time of maintenance
  • a hoistway penetrates each floor of a building (not shown).
  • the car 1 includes a car frame 2, a car room 3, a plurality of floor receiving frames 4, a plurality of weighing devices 10, and a control device 5.
  • the car 1 is provided inside the hoistway.
  • the basket 1 includes two floor receiving frames 4.
  • the basket 1 includes four weighing devices 10.
  • the car frame 2 includes a lower frame 2a, two vertical frames 2b, and an upper frame 2c.
  • the car frame 2 has the shape of a rectangular frame composed of a lower frame 2a, two vertical frames 2b, and an upper frame 2c.
  • the car room 3 includes a car floor 3a, four car side surfaces 3b, and a car ceiling 3c.
  • the car room 3 forms a space surrounded by a car floor 3a, four car side surfaces 3b, and a car ceiling 3c.
  • the car chamber 3 is provided inside the frame formed by the car frame 2.
  • the car floor 3a is the lower surface of the car room 3.
  • the car floor 3a is provided above the lower frame 2a.
  • each of the plurality of floor receiving frames 4 has a rod-shaped shape.
  • each cross section of the plurality of floor receiving frames 4 has a concave shape.
  • Each of the plurality of floor receiving frames 4 is provided below the car floor 3a. Each of the plurality of floor receiving frames 4 is provided above the lower frame 2a. Each of the plurality of floor receiving frames 4 is connected to the upper surface of the lower frame 2a.
  • Each of the plurality of weighing devices 10 includes a support spring 11 and a displacement measuring device 12.
  • Each of the plurality of weighing devices 10 is connected below the car floor 3a.
  • each of the plurality of weighing devices 10 is located at the four corners of the car floor 3a.
  • Each of the plurality of weighing devices 10 is connected to each of the plurality of floor receiving frames 4.
  • the support spring 11 has elasticity.
  • the support spring 11 has a horseshoe-shaped shape.
  • the support spring 11 is provided between the car floor 3a and the floor receiving frame 4.
  • the support spring 11 is provided so as to be elastically deformed in the vertical direction.
  • the support spring 11 is connected to the lower surface of the car floor 3a.
  • the support spring 11 is connected to the upper surface of the floor receiving frame 4.
  • control device 5 is provided on the upper surface of the car ceiling 3c.
  • the control device 5 is telecommunicationsally connected to each of the plurality of weighing devices 10.
  • the control device 5 calculates the vertical load applied to the entire car floor 3a by using the voltage values of the electromotive forces output by the plurality of weighing devices 10.
  • the car floor 3a is supported by a plurality of floor receiving frames 4 via a support spring 11.
  • the support spring 11 receives a force in the vertical direction from the car floor 3a.
  • the support spring 11 receives a normal force from the floor receiving frame 4.
  • the support spring 11 is elastically deformed in the vertical direction by a displacement amount corresponding to the load. The position of the car floor 3a moves downward with respect to the floor receiving frame 4 by the amount of the displacement.
  • the displacement measuring device 12 measures the relative position of the car floor 3a with respect to the floor receiving frame 4.
  • the displacement measuring instrument 12 outputs an electromotive force having a voltage corresponding to the relative position.
  • the control device 5 calculates the vertical load applied to the entire car floor 3a by using the voltage values of the electromotive forces output by the plurality of weighing devices 10.
  • FIG. 2 is a diagram showing a displacement measuring device of the elevator car weighing device according to the first embodiment.
  • FIG. 2 shows a simple equivalent circuit of the displacement measuring instrument 12.
  • the displacement measuring instrument 12 includes a differential transformer 20 and a base 30.
  • the differential transformer 20 includes a core 21, an exciting coil 22, a measuring coil 23, and a reference coil 24.
  • the core 21 has a cylindrical shape.
  • the material of the core 21 is a soft magnetic material.
  • the core 21 is an iron core.
  • the core 21 is connected to the car floor 3a.
  • the core 21 is provided perpendicular to the floor surface of the car floor 3a.
  • the core 21 is independent of the floor receiving frame 4.
  • the core 21 changes its position in conjunction with the car floor 3a.
  • the exciting coil 22 is made of copper wire.
  • the exciting coil 22 has a spiral shape.
  • the radius of the spiral portion of the exciting coil 22 is larger than the cylindrical radius of the core 21.
  • the upper portion of the exciting coil 22 is provided so as to surround a part of the core 21.
  • the central axis of the exciting coil 22 is coaxial with the central axis of the core 21.
  • the exciting coil 22 is provided so that the core 21 can move inside.
  • the exciting coil 22 forms a magnetic field when an electric current is applied.
  • the measuring coil 23 is made of copper wire.
  • the measuring coil 23 has a spiral shape.
  • the length of the spiral portion of the measuring coil 23 is shorter than the length of the spiral portion of the exciting coil 22.
  • the measuring coil 23 is provided adjacent to the exciting coil 22.
  • the measuring coil 23 is provided so as to surround a part of the core 21.
  • the measuring coil 23 is provided so that the core 21 moves inside.
  • the measuring coil 23 is provided so as to surround the upper portion of the exciting coil 22.
  • the central axis of the measuring coil 23 is coaxial with the central axis of the exciting coil 22. In the measuring coil 23, an induced electromotive force is induced when the exciting coil 22 forms a magnetic field.
  • the reference coil 24 is made of copper wire.
  • the reference coil 24 has a spiral shape.
  • the length of the spiral portion of the reference coil 24 is shorter than the length of the spiral portion of the exciting coil 22.
  • the number of turns and the shape of the reference coil 24 are equal to the number of turns and the shape of the measuring coil 23.
  • the reference coil 24 is provided adjacent to the exciting coil 22.
  • the reference coil 24 is provided so as to surround the lower portion of the exciting coil 22.
  • the central axis of the reference coil 24 is coaxial with the central axis of the exciting coil 22.
  • the reference coil 24 is provided at a position where the core 21 does not move inside. In the reference coil 24, an induced electromotive force is induced when the exciting coil 22 forms a magnetic field.
  • the board 30 includes an exciting power supply 31, an exciting voltage terminal 32, a measurement voltage terminal 33, a reference voltage terminal 34, a first processing circuit 35, a second processing circuit 36, and a storage unit (not shown).
  • the board 30 is telecommunications connected to a control device 5 (not shown).
  • the board 30 stores the calculated value in the storage unit.
  • the base 30 determines whether or not the installation of the elevator has been completed. When the board 30 is connected to the control device 5 by telecommunication, it is determined that the installation of the elevator is completed.
  • the base 30 determines whether or not the worker has started maintenance and inspection.
  • the board 30 receives maintenance information from a maintenance terminal (not shown) during maintenance and inspection of the elevator.
  • the board 30 stores maintenance information in a storage unit.
  • the maintenance information includes information on the number of maintenance inspections and information on the inspection load applied to the car floor 3a in the maintenance inspection.
  • the maintenance information includes information that "the inspection load in the nth maintenance inspection is X kg".
  • the inspection at the time of installing the elevator means the 0th maintenance inspection.
  • the exciting voltage terminal 32 is electrically connected to both ends of the exciting coil 22.
  • the exciting voltage terminal 32 measures the potential difference between both ends of the exciting coil 22.
  • the potential difference is described as excitation voltage V in '.
  • the measurement voltage terminal 33 is electrically connected to both ends of the measurement coil 23.
  • the measurement voltage terminal 33 measures the potential difference between both ends of the measurement coil 23. The potential difference is described as measuring voltage V 1.
  • the reference voltage terminal 34 is electrically connected to both ends of the reference coil 24.
  • the reference voltage terminal 34 measures the potential difference between both ends of the reference coil 24. The potential difference is described with the reference voltage V T.
  • the first processing circuit 35 sets the voltage value of the excitation power supply 31 to set the voltage V in.
  • the first processing circuit 35 performs feedback control of the exciting power supply 31.
  • the first processing circuit 35 determines whether or not the value of the set voltage V in and the excitation voltage V in 'matches. When the values of the set voltage V in and the exciting voltage V in ′ do not match, the first processing circuit 35 calculates the sum of the power supply correction value ⁇ V in and the value of the exciting voltage V in ′.
  • the power supply correction value ⁇ V in is the difference between the value of the set voltage V in and the value of the excitation voltage V in ′. After that, the first processing circuit 35 sets the value of the sum to the voltage value of the exciting power supply 31.
  • the first processing circuit 35 by using the value of the reference voltage V T with the value of the measured voltage V 1, and calculates the first correction voltage V 2.
  • the second processing circuit 36 obtains the information of the setting voltage V in from the control device 5.
  • the second processing circuit 36 outputs the information of the set voltage V in the first processing circuit 35.
  • the second processing circuit 36 calculates the machine error ⁇ .
  • the second processing circuit 36 by using the first correction voltage and mechanical error tau, calculates a second correction voltage V 3.
  • the mechanical error ⁇ is an error of the voltage value generated by a mechanical factor.
  • mechanical factors include changes in the elastic modulus of the support spring 11 (not shown), changes in the position of the core 21 due to vibration, and the like.
  • Displacement measuring device 12 outputs the second correction voltage V 3 corresponding to the position of the core 21 to the controller 5.
  • the exciting coil 22 generates a corresponding magnetic field in the excitation voltage V in 'of the alternating current.
  • the magnetic field causes electromagnetic induction in the measuring coil 23 and the reference coil 24.
  • Induced electromotive force generated in the measuring coil 23 by the electromagnetic induction is measured voltages V 1.
  • Induced electromotive force generated in the reference coil 24 by the electromagnetic induction is the reference voltage V T.
  • the first processing circuit 35 by using the value of the reference voltage V T with the value of the measured voltage V 1, and calculates the first correction voltage V 2.
  • the second processing circuit 36 calculates the second correction voltage V 3 by using the value of the first correction voltage V 2 and the mechanical error ⁇ .
  • the second processing circuit 36 outputs the second correction voltage V 3 to the control device 5.
  • the control device 5 acquires information on the second correction voltage V 3 from each of the plurality of weighing devices. Control unit 5, by using the information of the second correction voltage V 3, and calculates the load applied to each of the plurality of weighing device 10.
  • FIG. 3 is a block diagram of the elevator car weighing device according to the first embodiment.
  • the differential transformer 20 if the excitation voltage V in 'is input, and outputs the reference voltage V T and the measured voltage V 1.
  • the measured voltage V 1 is proportional to the exciting voltage V in ′ with a proportionality constant ⁇ 1 .
  • the proportionality constant ⁇ 1 changes depending on the volume of the core 21 existing in the internal region of the measuring coil 23 and the ambient temperature of the differential transformer 20. For example, when the volume of the core 21 existing in the internal region of the measuring coil 23 increases, the proportionality constant ⁇ 1 becomes large.
  • the reference voltage VT is proportional to the exciting voltage V in ′ with a proportionality constant ⁇ 2 .
  • the proportionality constant ⁇ 2 is the mutual inductance between the exciting coil 22 and the reference coil 24.
  • the proportionality constant ⁇ 2 changes depending on the ambient temperature of the differential transformer 20.
  • the first processing circuit 35 the ambient temperature of the differential transformer 20 to correct the influence of the measuring voltage V 1.
  • the first processing circuit 35 uses the reference voltage V T, calculates a temperature correction value alpha T. Temperature correction value alpha T is a function of the value of the reference voltage V T.
  • the first processing circuit 35 calculates the sum of the values of the measured voltage V 1 and the temperature correction value ⁇ T.
  • the first processing circuit 35 the value of the sum and the first correction voltage V 2.
  • the first processing circuit 35 outputs the first correction voltage V 2 to the second processing circuit 36.
  • V 2 V 1 + ⁇ T (1)
  • the first processing circuit 35 when the maintenance, and stores the information of the reference voltage V T corresponding to the check number in the storage unit. For example, the first processing circuit 35 stores the value of the reference voltage VT (n) in the storage unit.
  • the value of the reference voltage V T (n) is defined as the value of the reference voltage V T (n) in the n th maintenance.
  • the second processing circuit 36 calculates the sum of the value of the first correction voltage V 2 and the value of the mechanical error ⁇ .
  • the second processing circuit 36 calculates the sum of the value of the sum and the second correction voltage V 3.
  • the second processing circuit 36 stores the information of the first correction voltage V 2 corresponding to the inspection load in the storage unit.
  • the second processing circuit 36 stores the value of the first inspection voltage V 2 (n, X) in the storage unit.
  • the value of the first inspection voltage V 2 (n, X) is defined as the value of the first correction voltage V 2 when the inspection load X kg is applied in the nth maintenance inspection.
  • the second processing circuit 36 determines whether or not the value of V 2 (n, X) and the value of V 2 (n-1, X) are equal. For example, if the value of V 2 (n, X) and the value of V 2 (n-1, X) are not equal, the second processing circuit 36 sets the value of the first inspection voltage V 2 (n, X). Use to calculate the machine error ⁇ . The second processing circuit 36 calculates the difference between the values of the inspection voltages for the last two inspections having the same inspection load. The second processing circuit 36 uses the value of the difference as the mechanical error ⁇ .
  • the difference between the value of V 2 (n, X) measured in the past and the value of V 2 (n-1, X) is defined as the mechanical error ⁇ .
  • ⁇ V 2 (n, X) -V 2 (n-1, X) (3)
  • the second processing circuit 36 calculates the sum of the value of the first correction voltage V 2 and the mechanical error ⁇ .
  • the second processing circuit 36 the sum and the second correction voltage V 3.
  • the second processing circuit 36 when the maintenance, and stores the information of the second correction voltage V 3 corresponding to the check load in the storage unit.
  • the second processing circuit 36 stores the value of the second inspection voltage V 3 (X) in the storage unit.
  • the second inspection voltage V 3 (X) is defined as the value of the second correction voltage V 3 when the inspection load X kg is applied.
  • FIG. 4 is a plan view of the elevator car weighing device according to the first embodiment.
  • the support spring 11 is connected to the lower surface of the car floor 3a.
  • the support spring 11 is connected to the upper surface of the floor receiving frame 4.
  • the core 21 is connected to the lower surface of the car floor 3a via a jig.
  • the displacement measuring instrument 12 is connected to the floor receiving frame 4.
  • the base 30 is provided on the side of the displacement measuring instrument 12.
  • a part of the core 21 exists inside the displacement measuring instrument 12.
  • the core 21 moves downward with respect to the displacement measuring instrument 12.
  • FIG. 5 is a flowchart for explaining an outline of the operation at the time of maintenance and inspection of the elevator car weighing device according to the first embodiment.
  • step S001 the base 30 determines whether or not the elevator installation work has been completed.
  • step S002 the operation of step S002 is performed.
  • step S002 the elevator installation work is performed.
  • step S003 the board 30 and the second processing circuit 36 store the signal in the no-load state in the storage unit.
  • Base 30 stores reference during installation voltage V T a (0) in the storage unit.
  • the second processing circuit 36 stores the value of the first correction voltage V 2 (0, 0) in the no-load state at the time of installation in the storage unit.
  • the board 30 stores the value of the second correction voltage V 3 (0) in the no-load state in the storage unit.
  • the base 30 ends the processing.
  • step S004 the weighing device 10 operates by normal operation.
  • step S005 the operation of step S005 is performed.
  • the first processing circuit 35 determines whether or not the value of the set voltage V in and the excitation voltage V in 'matches.
  • step S005 if the value of the set voltage V in and the excitation voltage V in 'do not match, the operation of step S006 is performed.
  • step S006 the first processing circuit 35 sets the sum of the value and the power correction value [Delta] V in the excitation voltage V in 'to the voltage value of the excitation power supply 31.
  • step S005 If the worker has not started maintenance and inspection in step 007, the operations after step S005 are performed.
  • step S008 the second processing circuit 36 receives maintenance information from a maintenance terminal (not shown).
  • the first processing circuit 35 determines whether or not the value of the maintenance time of the reference voltage V T (n) and the value of the installation time of the reference voltage V T (0) are equal.
  • step S008 if the value of the maintenance time of the reference voltage V T (n) and the value of the installation time of the reference voltage V T (0) is not equal, the operation of step S009 is performed.
  • step S009 the first processing circuit 35 calculates the temperature correction value alpha T using the value of V T (n). In the first processing circuit 35, the sum of the value of the measured voltage V 1 and the temperature correction value ⁇ T is defined as the first correction voltage V 2 .
  • step S010 the second processing circuit 36 determines whether or not the value of V 2 (n, 0) and the value of V 2 (n-1, 0) are equal to each other.
  • step S011 the second processing circuit 36 sets the difference between V 2 (n, 0) and V 2 (n-1, 0) as the mechanical error ⁇ .
  • the sum of the first correction voltage V 2 and the mechanical error ⁇ is defined as the second correction voltage V 3 .
  • step S012 the operation of step S012 is performed.
  • the second processing circuit 36 rewrites the value of the second correction voltage V 3 (0) in the no-load state stored in the storage unit to the value of the second correction voltage V 3.
  • the base 30 ends the processing.
  • step S008 if the value of the maintenance time of the reference voltage V T (n) and the value of the installation time of the reference voltage V T (0) are equal, the operation of step S013 is performed.
  • step S013 the first processing circuit 35 sets the value of the measured voltage V 1 as the first correction voltage V 2 .
  • step S010 After that, the processing after step S010 is performed.
  • step S010 If the value of V 2 (n, 0) and the value of V 2 (n-1, 0) are equal in step S010, the operation of step S014 is performed.
  • step S014 the second processing circuit 36 sets the value of the first correction voltage V 2 to the second correction voltage V 3 .
  • step S012 After that, the processing after step S012 is performed.
  • each of the plurality of weighing devices 10 includes a differential transformer 20 and a first processing circuit 35.
  • the differential transformer 20 includes a core 21, one exciting coil 22, a measuring coil 23, and a reference coil 24.
  • the measuring coil 23 and the reference coil 24 are provided side by side in the vertical direction. Therefore, the plurality of weighing devices 10 can reduce the horizontal dimension.
  • the first processing circuit 35 uses the value of the reference voltage V T, calculates a temperature correction value alpha T.
  • the sum of the value of the measured voltage V 1 and the temperature correction value ⁇ T is defined as the first correction voltage V 2 .
  • the weighing device 10 can suppress an error in the measured load due to a change in the ambient temperature.
  • each of the plurality of weighing devices 10 includes an exciting power supply 31 as a power supply device.
  • Each of the plurality of weighing devices 10 includes a second processing circuit 36.
  • the second processing circuit 36 as excitation voltage V in 'is a constant value, performs feedback control of the power supply. Therefore, the weighing device 10 can reduce the error of the measured load due to the fluctuation of the power supply voltage.
  • each of the plurality of weighing devices 10 includes a second processing circuit 36.
  • the second processing circuit 36 calculates the mechanical error ⁇ using the values of the plurality of first correction voltages V 2 measured in the past.
  • the sum of the value of the first correction voltage V 2 and the mechanical error ⁇ is taken as the second correction voltage V 3 . Therefore, the weighing device 10 can reduce the error of the measured load generated by the mechanical factor.
  • the second processing circuit 36 calculates the mechanical error ⁇ using the values of the plurality of first correction voltages V 2.
  • the first correction voltage V 2 is calculated from the measured voltage V 1. Accordingly, the second processing circuit 36, by using a plurality of measurement voltages V 1 measured in the past by the measuring coil 23, calculates the mechanical error tau. Therefore, the weighing device 10 can reduce the error of the measured load generated by the mechanical factor.
  • the material of the core 21 may be a non-magnetic metal.
  • the material of the core 21 is aluminum, copper, brass, or the like.
  • the elevator car weighing device can be used for the elevator system.

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Abstract

L'invention concerne un dispositif de pesage de cabine d'ascenseur susceptible de supprimer une erreur de charge de mesure provoquée par un changement de température environnante. Le dispositif de pesage de cabine d'ascenseur selon l'invention comprend : un noyau qui change sa position conjointement avec un plancher de cabine d'un ascenseur ; une bobine d'excitation qui forme un champ magnétique en étant traversée par du courant ; une bobine de mesure qui est adjacente à la première bobine d'excitation, qui est disposée de manière à entourer une partie du noyau et dans laquelle, lorsque la bobine d'excitation forme un champ magnétique, une force électromotrice induite est générée ; une bobine de référence qui est adjacente à la première bobine d'excitation, qui est disposée de façon à ne pas faire bouger le noyau à l'intérieur et dans laquelle, lorsque la première bobine d'excitation forme un champ magnétique, une force électromotrice induite est générée ; et un premier circuit de traitement qui calcule une valeur de correction de température en utilisant une valeur de la tension de référence mesurée par la bobine de référence et qui obtient, en tant que première tension de correction, la somme de la valeur de correction de température et de la valeur d'une tension de mesure mesurée par la bobine de mesure.
PCT/JP2020/022014 2020-06-03 2020-06-03 Dispositif de pesage de cabine d'ascenseur WO2021245855A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2022529231A JP7276609B2 (ja) 2020-06-03 2020-06-03 エレベーターのかごの秤装置
PCT/JP2020/022014 WO2021245855A1 (fr) 2020-06-03 2020-06-03 Dispositif de pesage de cabine d'ascenseur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/022014 WO2021245855A1 (fr) 2020-06-03 2020-06-03 Dispositif de pesage de cabine d'ascenseur

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52108960U (fr) * 1976-02-16 1977-08-18
JPH01152316A (ja) * 1987-12-09 1989-06-14 Mitsubishi Electric Corp エレベータの荷重検出装置
WO2002064478A1 (fr) * 2001-02-09 2002-08-22 Mitsubishi Denki Kabushiki Kaisha Dispositif de mesure de charge pour ascenseur
JP2011051764A (ja) * 2009-09-03 2011-03-17 Toshiba Elevator Co Ltd エレベータ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52108960U (fr) * 1976-02-16 1977-08-18
JPH01152316A (ja) * 1987-12-09 1989-06-14 Mitsubishi Electric Corp エレベータの荷重検出装置
WO2002064478A1 (fr) * 2001-02-09 2002-08-22 Mitsubishi Denki Kabushiki Kaisha Dispositif de mesure de charge pour ascenseur
JP2011051764A (ja) * 2009-09-03 2011-03-17 Toshiba Elevator Co Ltd エレベータ

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