JP2011011861A - Car lock abnormality detecting method of elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a car lock abnormality detecting method of an elevator capable of early and surely detecting car lock abnormality, without requiring a special device.SOLUTION: When a car is put in a no-load state based on a detecting signal of a load detecting means, the car is lifted in advance by a specific distance, and a torque command value at this time or an electric current command value or an electric current feedback value fed back to a control deice from an electric motor or a torque feedback value converted from the electric current feedback value, are stored in a storage part as a determining value, and the lock abnormality of the car is detected by comparing a present torque command value in the no-load state or a present electric current command value or a present electric current feedback value or a present torque feedback value converted from the electric current feedback value with the determining value.

Description

  The present invention relates to an elevator car lock abnormality detection method for detecting car lock abnormality.

  Conventionally, as an elevator car lock abnormality detection, the car operating torque command is calculated based on the deviation between the car speed command and the actual speed, and it is detected that the value exceeds the specified value. When the state where any one of the actual speeds is less than a predetermined value is continued for a predetermined time or more, there is a case where the abnormality is judged to be abnormal and a sudden stop is performed (for example, see Patent Document 1).

  It is also proposed to calculate the car load on both the motor side and the car, and to judge signs of car lock abnormalities such as sheave idling, rope slip, brake braking force drop, etc. based on the difference and comparison with the specified value (For example, refer to Patent Document 2).

  Furthermore, there is a case in which when the difference between the loaded weight in the car and the total car weight deviates from a predetermined value, it is determined that the car is locked abnormally and the elevator is urgently stopped (see, for example, Patent Document 3).

JP-A-11-322218 (paragraph numbers 0012 to 0016, FIG. 2) Japanese Patent Laid-Open No. 11-199153 (paragraph numbers 0007 to 0012, FIG. 2) JP-A-11-79589 (paragraph numbers 0019 to 0031, FIG. 1)

  However, in Patent Document 1 and Patent Document 2 described above, a relatively long time may elapse from the occurrence of the car lock abnormality to the detection of the abnormality and then the emergency stop. For this reason, if the operation is continued for a while in a state where an abnormality has occurred, there has been a problem that equipment damage is increased due to continued running during that time. Further, in Patent Document 3, it is necessary to further provide a total weight detection sensor for detecting the total weight of the car and the load weight in addition to the load weight detection sensor for detecting the load amount of the car as the abnormality detection means. That is, since it is necessary to add a total weight detection sensor to a standard device, there is a problem that the cost is increased.

  The present invention has been made from the above-described prior art, and an object of the present invention is to detect an elevator car lock abnormality early and reliably without requiring a special device. Is to provide.

  In order to achieve the above object, the invention according to claim 1 of the present invention includes a car that services a plurality of floors, an electric motor that drives the car via a rope, a control device that controls the electric motor, An elevator equipped with load detecting means for detecting a load in the car, wherein the car is in an unloaded state based on a detection signal of the load detecting means in the elevator car lock abnormality detecting method for detecting the car lock abnormality. The car is moved up and down by a certain distance in advance, and the torque command value or current command value at this time is stored in the storage unit as a determination value, and the current torque command value or current current in the no-load state is stored. A command value and the determination value are compared to detect a lock abnormality of the car.

  In the invention according to claim 1 of the present invention, when the car is in an unloaded state based on the detection signal of the load detecting means, the car is moved up and down by a predetermined distance in advance, and the torque command value or current command at this time The value is stored as a determination value, and this determination value is compared with the current torque command value or the current current command value in the no-load state to detect a car lock abnormality. As a result, the car lock abnormality is regularly detected by a standard device, and the car lock abnormality can be detected early and reliably.

  In addition, the invention according to claim 2 of the present invention detects a car serving a plurality of floors, an electric motor that drives the car via a rope, a control device that controls the electric motor, and a load in the car. In an elevator equipped with a load detection means, in the elevator car lock detection method for detecting the car lock abnormality, when the car is in an unloaded state based on a detection signal of the load detection means, The car is moved up and down by a certain distance, and at this time, the current feedback value fed back from the electric motor to the control device, or the torque feedback value converted from the current feedback value is stored in the storage unit as a determination value, and in the no-load state The present current feedback value or the current torque feedback value converted from the current feedback value is compared with the determination value to detect a lock abnormality of the car. To have.

  In such an invention according to claim 2 of the present invention, when the car is in an unloaded state based on the detection signal of the load detecting means, the car is raised and lowered in advance by a predetermined distance, and at this time, the car is fed back to the control device. Current feedback value or torque feedback value converted from this current feedback value is stored in the storage unit as a judgment value, and this judgment value and the current current feedback value in the no-load state or the current feedback value converted from this current feedback value The torque feedback value of the car is compared to detect the car lock abnormality. As a result, the car lock abnormality is regularly detected by a standard device, and the car lock abnormality can be detected early and reliably.

  Further, in the invention according to claim 3 of the present invention, the torque command value, or the current command value, or the current feedback value, or the torque feedback value is divided at the time of starting the car and during steady running. It is measured and reflected in lock abnormality detection.

  In the invention according to claim 3 of the present invention, the car lock abnormality detection is performed separately at the time of starting and at the time of steady running, so that the accuracy of abnormality detection can be increased and the value at the time of starting is set. When a car lock abnormality is detected based on this, it is possible to immediately stop the raising and lowering of the car, and to prevent an increase in equipment damage due to continuous operation of the car in a state where the car lock abnormality has occurred. it can.

  According to the present invention, a car lock abnormality can be regularly detected with a standard device, and the car lock abnormality can be detected early and reliably, thereby improving the safety of the elevator. , Cost improvement can be suppressed.

1 is a schematic configuration diagram of an elevator to which a car lock abnormality detection method according to the present invention is applied. It is a flowchart which shows the process sequence of the judgment value measurement driving | operation in one Example of the cage lock abnormality detection method of an elevator. It is a flowchart which shows the process sequence of the car lock abnormality detection driving | operation in one Example of the car lock abnormality detection method of an elevator.

  Hereinafter, an embodiment of an elevator car lock abnormality detection method according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the elevator system in the present embodiment includes a car 1 that moves up and down a hoistway, a counterweight 2, a rope 3 that is connected to the car 1 and the counterweight 2 at an end, and a rope 3. An electric motor 4 that is wound and drives the rope 3 to move the car 1 and the counterweight 2 up and down, load detection means (not shown) for detecting a load in the car, and the car 1 ascending and descending direction. In-car operation panel 5 in which destination buttons, door open / close buttons, and switches are set, and landing button 7 for bringing car 1 in an arbitrary direction, for example, in a machine room. It has a control panel 8 and a maintenance operation device 9 provided outside.

  The control panel 8 is provided with a control device 80 for controlling the operation of the elevator, and this control device 80 is constituted by an MPU 800. The MPU 800 includes an electric motor control unit 801 that controls the electric motor 4 by a torque command, a current feedback command, and the like to the electric motor 4, an operation control unit 802 that controls the entire elevator, and a car lock detection unit 803 that performs car lock abnormality detection. , A RAM area, and a storage section (not shown) including a ROM area.

  The car lock detection unit 803 according to the present embodiment moves the car 1 up and down in advance by a predetermined distance when the car 1 is in the no-load state based on the detection signal of the load detection means, and stores the torque command value at this time as a determination value. Part, for example, in the ROM area, and compares the current torque command value in the no-load state with the determination value to detect the lock abnormality of the car 1. The car lock detection unit 803 has a storage table of torque command values recorded in advance in the measurement operation, and this storage table has a maximum torque command value at startup and an average torque command value at steady running for each elevation direction. Record and store. There is also a table that stores judgment values for the same recorded storage for abnormality determination. For example, when the initial measurement value is set to 30% and this determination value is exceeded, it is determined that a car lock abnormality has occurred. To do. This determination value can be arbitrarily changed by a predetermined changing means according to the situation of each property.

  Here, based on FIG. 2, the processing procedure of the determination value measurement driving | operation in a present Example is demonstrated. Here, as an example, a case where the torque command value is measured from the state where the car 1 is stopped on the lowest floor will be described. However, the torque command is not limited to any floor other than the lowest floor. Measurement of the value is possible.

  First, in step S1, it is determined whether there is no load in the car 1 that is in a stopped state based on the detection signal of the load detection means. Here, if there is a load in the car 1, a change in the torque command value at the time of no load is taken into consideration and an accurate judgment value cannot be obtained. . Note that the determination as to whether or not the car is loaded in step S1 is based on the assumption that a person who is light enough to fall below the level determined by the load detection means is in the car 1, for example. When it is determined that the operation, the mechanical shoe, and the sensors of the photoelectric device are in operation and there are passengers in the car 1, the determination value cannot be obtained accurately. You may not start.

  When the start condition for the determination value measurement operation is satisfied, preparation for starting the operation is performed in step S2. For this start preparation, for example, an operator such as a maintenance person who performs the determination value measurement operation switches the internal control mode to the torque command value by switching the maintenance SW (not shown) of the in-car operation panel 5 and pressing the open / close button for 2 seconds. Switch to measurement preparation. In this state, in step S3, the operator moves out of the car 1 and executes a departure operation by, for example, pressing the landing button 7 for 2 seconds or more, thereby starting the elevator as step S4. Note that steps S2 and S3 described above may be arbitrarily executed by the external maintenance operation device 9, or may be executed remotely using an external communication means such as a telephone line. Further, in this embodiment, the lock abnormality detection of the car 1 is performed at a low speed, for example, 15 m / min, and accordingly, the speed of the determination value measurement operation is also set to 15 m / min to provide consistency. When detecting the lock abnormality of the car 1 at the rated speed, the judgment value measurement operation is also performed at the rated speed to provide consistency.

  The 15-second travel shown in step S5 may be a travel of about several seconds required for the car speed to reach 15 m / min after the elevator is started. Here, the measurement time is assumed to be 15 seconds. During this 15 seconds, the maximum torque command value at the start of UP startup and the average torque command value at the time of UP steady running accompanying the raising of the car 1 from the lowest floor are temporarily stored in the RAM area of the MPU 800. Remember. After starting for a predetermined time, the car 1 is stopped as a step S6, and then the operation direction is reversed and a DOWN operation over 15 seconds is started as a step S7. Then, during the 15 seconds, the maximum torque command value at the start of DOWN activation and the average torque command value at the time of DOWN rated running are also temporarily stored in the RAM area. After DOWN running for 15 seconds, the car 1 is stopped in step S8, and then the measurement data temporarily stored in the RAM area in step S9 is written as a determination value in the torque measurement value storage table in the ROM area.

Note that, as the determination value, first, a value having a margin of 30%, for example, is calculated from the maximum torque at startup and the average torque at steady running. In addition, when the car 1 is moved up and down from the lowest floor and the judgment value measurement operation is performed, a rope imbalance occurs due to a change in the rope weight near the top floor, and it is judged abnormal even though the threshold is not actually exceeded. It is thought that it is done. Therefore, it is necessary to further perform the rope unbalance correction on the determination value having the tolerance of 30% described above. That is, correction is performed by subtracting the rope unbalance torque from the starting torque in the measurement operation performed near the lowest floor and the average torque during steady running. The rope unbalance torque at this time makes the value corrected for each floor variable. In other words, the rope unbalance torque is calculated by Equation 1 and the rope unbalance correction amount corresponding to the car position is calculated by Equation 2.
(Equation 1)
Rope unbalance torque (τr) = rope single weight x number of ropes x stroke x 9.8 x sheave diameter / 2
(Equation 2)
Rope unbalance correction amount = τr × ((top floor position−departure position) / top floor position) × motor rated torque Here, the processing procedure of the car lock abnormality detection operation in the present embodiment will be described based on FIG.

  For example, the lock abnormality detection operation of the car 1 is permitted on the condition that the elevator stop state has passed for a certain period of time. In step S21, it is determined whether or not there is no load in the car 1 based on the detection signal of the load detection means, and when it is determined that there is no load, the detection operation is started. As described above, if there is a load in the car 1, a change in the torque command value at the time of no load is taken into account and an accurate measurement value cannot be obtained.

  When the detection operation start condition is satisfied, the operation direction is determined by the car position in step S22, and the lock detection operation of the car 1 is started. The driving direction in this detection operation is set in advance such that, for example, the car 1 is UP traveling when the lowest floor is stopped, and the DOWN traveling is performed when the car 1 is the uppermost floor or the intermediate floor. Moreover, this detection operation may be performed from the floor end to the floor end, or may be a reciprocating operation. Note that FIG. 2 shows a case in which the lock abnormality detection of the car 1 is determined while driving to the end floor after starting UP or DOWN travel.

  When UP traveling is determined in step S22, first, in step S23, the starting torque command value (TR) is set to the starting torque command value (UP_A) recorded in the measurement operation in advance, and the starting torque margin (UP_AS) is set. Considering this, when the value exceeds the determination value obtained by subtracting the correction amount from this, it is determined to be abnormal. When it determines with it being abnormal here, while transfering to step S28 and stopping an elevator, that is notified outside as step S29. If the torque determination at start-up is normal in step S23, the detection operation is further continued, and in step S24, the torque command value (TR) during steady running is the average torque command value during steady running (preliminarily recorded during measurement running) UP_B) is added with the steady-state torque tolerance (UP_BS), and when it exceeds the judgment value obtained by subtracting the correction amount from this, it is judged as abnormal. When it determines with it being abnormal here, while transfering to step S28 and stopping an elevator, that is notified outside as step S29. On the other hand, when it determines with normal in step S24, a driving | operation is continued to the floor end as it is. If it is determined in step S27 that the car 1 has traveled to the floor level, the car 1 is stopped and automatically returned to normal operation.

  Further, when the DOWN direction is selected in the above-described step S22, the torque command value (TR) at the time of activation is added to the torque command value at the time of activation (DN_A) previously recorded in the measurement operation (DN_A) as a step S25. DN_AS) is taken into account, and if it exceeds the judgment value obtained by subtracting the correction amount from this, it is judged as abnormal. When it determines with it being abnormal here, while transfering to step S28 and stopping an elevator, that is notified outside as step S29. If the torque determination at start-up is normal in step S25, the detection operation is further continued, and in step S26, the torque command value (TR) during steady running is the average torque command value during steady running ( DN_B) is added with the steady-state torque tolerance (DN_BS), and if it exceeds the judgment value obtained by subtracting the correction amount from this, it is judged as abnormal. When it determines with it being abnormal here, while transfering to step S28 and stopping an elevator, that is notified outside as step S29. On the other hand, when it determines with normal in step S26, a driving | running is continued as it is to the floor end. If it is determined in step S27 that the car 1 has traveled to the floor level, the car 1 is stopped and automatically returned to normal operation.

According to the present embodiment, the car lock abnormality can be detected regularly with a standard device, and the car lock abnormality can be detected early and reliably, thereby improving the safety of the elevator. However, an improvement in cost can be suppressed. In particular, from doing the car lock abnormality detection is divided into a torque command value of the torque command value and the steady running of the startup, it is possible to improve the accuracy of abnormality detection based on the torque command value on startup When the car lock abnormality is detected, the raising / lowering of the car 1 is immediately stopped, so that it is possible to prevent an increase in equipment damage caused by continuously operating the car 1 in a state where the car lock abnormality has occurred. .

  In the above-described embodiment, the case where the car lock abnormality is detected by comparing the current torque command value in the no-load state and the determination value has been described. However, the present invention is not limited to this, and the car 1 is When the car 1 is in the no-load state, the car 1 is moved up and down a predetermined distance in advance, and the current command value at this time is stored as a judgment value in the storage unit, and the current command value in the no-load state is compared with the judgment value. When the car 1 is in a no-load state, the car 1 is raised and lowered in advance by a predetermined distance, and the current feedback value fed back from the motor 4 to the control device 80 at this time is stored as a determination value in the storage unit. The current current feedback value in the load state is compared with the determination value, or when the car 1 is in the no-load state, the car 1 is raised and lowered in advance by a predetermined distance, and the current fed back from the motor 4 to the control device 80 at this time Return The torque feedback value converted from 1 is stored in the storage unit as a determination value, and the car lock abnormality detection is performed by comparing the current torque feedback value converted from the current feedback value in the no-load state with the determination value. You may do it.

DESCRIPTION OF SYMBOLS 1 Car 2 Counterweight 3 Rope 4 Electric motor 5 Car operation panel 6 Platform 7 Platform button 8 Control panel 9 Maintenance operation device 80 Control device 800 MPU
801 Electric motor control unit 802 Operation control unit 803 Car lock detection unit

Claims (3)

In an elevator that includes a car that services a plurality of floors, an electric motor that drives the car via a rope, a control device that controls the electric motor, and a load detection means that detects a load in the car, In the elevator car lock abnormality detection method for detecting car lock abnormality,
When the car is in an unloaded state based on the detection signal of the load detection means, the car is moved up and down a predetermined distance in advance, and the torque command value or current command value at this time is stored in the storage unit as a determination value. An elevator car lock abnormality detection method comprising: detecting a car lock abnormality by comparing a current torque command value in a no-load state or a current current command value with the determination value. In an elevator that includes a car that services a plurality of floors, an electric motor that drives the car via a rope, a control device that controls the electric motor, and a load detection means that detects a load in the car, In the elevator car lock abnormality detection method for detecting car lock abnormality,
When the car is in an unloaded state based on the detection signal of the load detecting means, the car is moved up and down by a certain distance in advance, and the current feedback value fed back from the motor to the control device at this time, or the current feedback The torque feedback value converted from the value is stored in the storage unit as a determination value, and the current feedback value in the no-load state or the current torque feedback value converted from the current feedback value is compared with the determination value to compare the car. An elevator car lock abnormality detection method characterized by detecting a lock abnormality in a car.   The torque command value, or the current command value, or the current feedback value, or the torque feedback value is measured separately when the car is started and during steady running, and is reflected in lock abnormality detection. The elevator car lock abnormality detection method according to claim 1 or 2.

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