JP2006298538A - Elevator device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elevator device capable of discriminating whether a position and speed detector works normally or not when a positional information abnormality is detected and capable of properly setting the car operating condition. <P>SOLUTION: When abnormality of reference position sensors 13-16 or abnormality of a result of car position computed by an ETS device 12 is detected, a diagnosis operating command for carrying out the diagnosing operation is output from the ETS device 12 to an operation control device 7. A diagnosing section 20 compares the car speed obtained by the operation control device 7 with the car speed obtained by the ETS device 12, and compares an absolute value of a difference between them with a reference value. If the absolute value of the difference of the car speed is smaller than the reference value, a speed governor encoder 9 is determined normal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an elevator apparatus having an electronic safety monitoring device that monitors a car speed by comparing an abnormal speed set in accordance with a car position with a car speed.

  The conventional terminal floor forced reduction device (ETS device) detects the car position and car speed based on the information from the governor encoder provided in the governor and the information from the reference position switch provided in the hoistway. Monitor the car speed near the end floor. As a result, as the car shock absorber and the counterweight shock absorber, a shortening buffer that uses the speed reduced by the ETS device as the allowable collision speed is used. Therefore, the maximum speed during normal driving is set higher than the allowable collision speed of the shortening buffer.

  However, if the reference position switch provided in the hoistway breaks down and the car position cannot be accurately detected, the ETS device cannot normally decelerate near the terminal floor. For this reason, in such a case, the car is run with the overspeed detection level set to be equal to or lower than the allowable collision speed of the shortening buffer (see, for example, Patent Document 1).

JP 2004-123279 A

  In the conventional elevator apparatus as described above, when the car position cannot be accurately detected, it cannot be identified whether the cause is a failure of the reference position switch or the governor encoder, and the speed is lower than usual. However, there was a possibility that the car could run with the governor encoder broken.

  The present invention has been made to solve the above-described problems. When a position information abnormality is detected, it is identified whether the position / speed detector is normal, and the operation condition of the car is appropriately set. It is an object to obtain an elevator apparatus that can be set to

  The elevator apparatus according to the present invention includes a car that is raised and lowered in the hoistway, a position speed detector for detecting the car position and the car speed, and is installed in the hoistway to detect that the car is located at the reference position. For detecting a car position and a car speed based on information from a reference position sensor, a position speed detector, and a reference position sensor, and monitoring whether the car speed reaches a monitoring overspeed set according to the car position. An electronic safety monitoring device and an operation control device that controls the operation of the car by detecting a car position and a car speed independently of the electronic safety monitoring device are provided. The electronic safety monitoring device is a car required by the electronic safety monitoring device. It is possible to detect a location information abnormality, which is an abnormality related to location information, and when a location information abnormality is detected, a diagnostic operation of the car is carried out and obtained by the operation control device during the diagnostic operation. By comparing the information obtained in broadcast and electronic safety monitoring device, the presence or absence of abnormality of the position and speed detector is diagnosed.

  The elevator apparatus according to the present invention performs a diagnostic operation of the car when a position information abnormality is detected, and compares the information obtained by the operation control device during the diagnostic operation with the information obtained by the electronic safety monitoring device. Since the presence / absence of an abnormality of the speed detector is diagnosed, when a position information abnormality is detected, it is possible to identify whether the position / speed detector is normal and to appropriately set the operation condition of the car.

The best mode for carrying out the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a block diagram showing an elevator apparatus according to Embodiment 1 of the present invention. In the figure, a driving device (winding machine) 1 is installed at the upper part of the hoistway. The drive device 1 includes a drive sheave, a motor unit that rotates the drive sheave, a brake unit 2 that brakes the rotation of the drive sheave, and a motor encoder that generates a detection signal corresponding to the rotation of the drive sheave.

  For example, an electromagnetic brake device is used as the brake unit 2. In an electromagnetic brake device, the brake shoe is pressed against the braking surface by the spring force of the braking spring to brake the rotation of the drive sheave, and when the electromagnetic magnet is excited, the brake shoe is released from the braking surface, and braking is performed. Canceled.

  A baffle 4 is provided in the vicinity of the driving device 1. A plurality of main ropes 3 (only one is shown in the figure) are wound around the drive sheave and the deflecting wheel 4. The car 5 and the counterweight 6 are suspended in the hoistway by the main rope 3, and are raised and lowered in the hoistway by the driving force of the driving device 1.

  The drive device 1 is controlled by an operation control device (control panel) 7. That is, the operation of the car 5 is controlled by the operation control device 7. A detection signal from a motor encoder is input to the operation control device 7. The operation control device 7 determines the car position and the car speed based on the detection signal from the motor encoder, and controls the drive device 1.

  The operation control device 7 includes a first computer having a first arithmetic processing unit (CPU), a storage unit (ROM, RAM, hard disk, etc.) and a signal input / output unit. The function of the operation control device 7 is realized by the first computer. That is, a control program for realizing the function of the operation control device 7 is stored in the storage unit of the first computer. A 1st arithmetic processing part performs the arithmetic processing regarding the function of the operation control apparatus 7 based on a control program.

  A speed governor 8 is installed in the upper part of the hoistway. The governor 8 has a governor sheave, an overspeed detection switch, a rope catch, and a governor encoder 9 as a position speed detector. A governor rope 10 is wound around the governor sheave. Both ends of the governor rope 10 are connected to an operation mechanism of an emergency stop device mounted on the car. The lower end portion of the governor rope 10 is wound around a tension wheel 11 disposed at the lower part of the hoistway.

  When the car 5 is raised and lowered, the speed governor rope 10 is circulated, and the speed governor sheave is rotated at a rotational speed corresponding to the traveling speed of the car 5. The governor 8 mechanically detects that the traveling speed of the car 5 has reached an overspeed. As the overspeed to be detected, a first overspeed higher than the rated speed and a second overspeed higher than the first overspeed are set.

  When the traveling speed of the car 5 reaches the first overspeed, the overspeed detection switch of the governor 8 is operated, and the safety circuit of the operation control device 7 is opened. When the safety circuit is opened, the motor power supply of the driving device 1 is cut off, the rotation of the driving sheave is braked by the brake unit 2, and the car 5 is emergency stopped. When the traveling speed of the car 5 reaches the second overspeed, the governor rope 10 is gripped by the rope catch of the governor 8 and the circulation of the governor rope 10 is stopped. When the circulation of the governor rope 10 is stopped, the emergency stop device performs a braking operation.

  The governor encoder 9 generates a detection signal corresponding to the rotation of the governor sheave. As the governor encoder 9, a dual-sense type encoder that simultaneously outputs two detection signals, that is, first and second detection signals, is used.

  The first and second detection signals from the governor encoder 9 are input to a terminal floor forced reduction device (hereinafter referred to as an ETS device) 12 as an electronic safety monitoring device. The ETS device 12 detects an abnormality of the elevator based on the detection signal from the governor encoder 9, and outputs a command signal for shifting the elevator to a safe state.

  Specifically, the ETS device 12 obtains a car speed and a car position independently of the operation control device 7 by a signal from the governor encoder 9, and the car speed becomes an ETS monitoring overspeed (abnormal speed). Monitor whether it reaches. The ETS monitoring overspeed is set as a pattern that changes steplessly with respect to the position within the car deceleration section of the hoistway terminal. The ETS monitoring overspeed is set lower than the first overspeed by the governor 8.

  When the ETS device 12 determines that the traveling speed of the car 5 has reached the ETS monitoring overspeed, the safety circuit of the operation control device 7 is opened, and the car 5 is emergency stopped.

  The ETS device 12 includes a second computer having a second arithmetic processing unit (CPU), a storage unit (ROM, RAM, hard disk, etc.) and a signal input / output unit. The function of the ETS device 12 is realized by a second computer. That is, a safety program for realizing the function of the ETS device 12 is stored in the storage unit of the second computer. A 2nd arithmetic processing part performs the arithmetic processing regarding the function of the ETS apparatus 12 based on a safety program.

  The second arithmetic processing unit is provided with first and second CPUs. The safety program includes the first and second safety programs having the same contents. The first CPU executes arithmetic processing based on the first safety program. The second CPU executes arithmetic processing based on the second safety program.

  The first and second CPUs can communicate with each other via an interprocessor bus and a two-port RAM. In addition, the first and second CPUs can confirm the soundness of the first and second CPUs themselves by comparing the calculation processing results of each other. That is, the soundness of the first and second CPUs is confirmed by causing the first and second CPUs to execute the same processing and comparing the processing results.

  When an abnormality in the ETS device 12 itself is detected, the ETS device 12 outputs a nearest floor stop command signal to the operation control device 7. Further, bidirectional communication is possible between the ETS device 12 and the operation control device 7.

  First to fourth reference position sensors (position detection switches) 13 to 16 for detecting that the car 5 is located at a reference position in the hoistway are provided at predetermined positions in the hoistway. Yes. As the reference position sensors 13 to 16, upper and lower terminal floor switches can be used. Detection signals from the reference position sensors 13 to 16 are input to the ETS device 12. The ETS device 12 corrects the car position information obtained in the ETS device 12 based on the detection signals from the reference position sensors 13 to 16.

  A car shock absorber 17 and a counterweight shock absorber 18 are installed at the bottom of the hoistway. As these shock absorbers 17 and 18, for example, oil-filled or spring-type buffers are used. Further, as the shock absorbers 17 and 18, shortening buffers that use the speed decelerated by the ETS device 12 as the allowable collision speed are used. Therefore, the maximum speed during normal driving is set higher than the allowable collision speed of the shortening buffer.

  The ETS device 12 includes an abnormality detection unit 19 that detects an abnormality in position information, which is an abnormality related to car position information obtained by the ETS device 12. The position information abnormality includes abnormality of the reference position sensors 13 to 16 (rational abnormality, ON failure, OFF failure) and abnormality of the car position calculation result in the ETS device 12.

  Specifically, when the abnormality detection unit 19 receives a combination of detection signals that cannot be received from the reference position sensors 13 to 16, for example, the car is simultaneously transmitted from the first reference position sensor 13 and the fourth reference position sensor 16. When a detection signal (ON signal) is received, it is determined that a rational abnormality has occurred.

In addition, the abnormality detection unit 19 determines that an ON failure has occurred when the reference position sensors 13 to 16 remain in the ON state even when the car 5 travels a certain distance or more.
Further, the abnormality detection unit 19 is configured so that the reference position sensors 13 to 16 remain in the OFF state even when the car 5 travels for a certain distance or, for example, the second reference position sensor 14 remains in the OFF state. When the first reference position sensor 13 is turned on, it is determined that an OFF failure has occurred.
The function of the abnormality detection unit 19 is realized by a second computer that constitutes the ETS device 12.

  Furthermore, the abnormality detection unit 19 sets a difference between the car position calculated in the ETS device 12 based on the detection signal from the governor encoder 9 and the car position detected by the reference position sensors 13 to 16. If it is equal to or greater than the value, it is determined that an abnormality in the car position calculation result has occurred.

  When the abnormality of the reference position sensors 13 to 16 as described above or the abnormality of the car position calculation result in the ETS device 12 is detected, a diagnostic operation command for performing the diagnostic operation is sent from the ETS device 12 to the operation control device 7. Is output.

  When the operation control device 7 receives the diagnostic operation command, the operation control device 7 travels the car 5 for a preset short distance (diagnosis operation), and obtains the car speed information obtained by the operation control device 7 based on the detection signal from the motor encoder. Output to the ETS device 12. The traveling speed of the car 5 in the diagnostic operation is set to be equal to or lower than the allowable collision speed of the shock absorbers 17 and 18. Further, the traveling direction of the car 5 in the diagnostic operation is preferably a direction away from the terminal floor.

  The ETS device 12 includes a diagnostic unit 20 that diagnoses whether or not the governor encoder 9 is abnormal during diagnostic operation. The function of the diagnosis unit 20 is realized by a second computer that constitutes the ETS device 12.

FIG. 2 is an explanatory diagram for explaining a diagnosis method by the diagnosis unit 20 of FIG. The ETS device 12 includes a speed calculation unit 21 that obtains a car speed based on a detection signal from the governor encoder 9. The function of the speed calculation unit 21 is realized by a second computer constituting the ETS device 12. The diagnosis unit 20 compares the _car speed V _con obtained by the operation control device 7 with the _car speed V _ETS obtained by the speed calculation unit 21, and compares the absolute value of the difference with the reference value ΔV _ver . When the absolute value of the difference between V _con and V _ETS is smaller than ΔV _ver, it is determined that the governor encoder 9 is normal.

The reference value ΔV _ver is preferably set to a sufficiently small value as long as no false detection occurs. Further, in this example, the comparison is made by the car speed, but the comparison may be made by the movement amount of the car 5. That is, the absolute value of the difference between the car movement amount during the diagnostic operation obtained by the operation control device 7 and the car movement amount obtained in the ETS device 12 may be compared with a reference value.

  FIG. 3 is a graph showing an ETS monitoring overspeed pattern set in the ETS device 12 of FIG. In the figure, the ETS monitoring overspeed pattern II is set to be substantially equidistant from the rated traveling pattern I when traveling to the terminal floor at the rated speed. As described above, the ETS monitoring overspeed pattern II in the vicinity of the terminal floor is set so as to continuously change according to the distance (cage position) from the upper surface of the buffer. Specifically, the ETS monitoring overspeed pattern II is set to continuously decrease toward the terminal floor.

  When the abnormality detection unit 19 detects an abnormality and the diagnosis unit 20 determines that the speed governor encoder 9 is normal, the ETS device 12 can detect the car speed normally. The overspeed pattern is changed to a pattern IIa that is constant regardless of the distance from the terminal floor and is equal to or less than the buffer allowable collision speed. At the same time, the ETS device 12 outputs a command for switching the operation mode of the car 5 by the operation control device 7 to the low-speed operation mode to the operation control device 7. In the low speed operation mode, the operation control device 7 makes the maximum speed of the traveling speed pattern of the car 5 lower than the pattern IIa (pattern Ia).

  Therefore, during operation in the low speed operation mode, the ETS device 12 makes the car 5 perform an emergency stop when the car speed reaches the pattern IIa regardless of the car position.

  Further, when an abnormality is detected by the abnormality detection unit 19 and the speed governor encoder 9 is determined to be abnormal by the diagnosis unit 20, the operation of the car 5 is stopped and a notification is given to the elevator management room.

  In the elevator apparatus as described above, the ETS apparatus 12 can detect the abnormality of the reference position sensors 13 to 16 and the abnormality of the car position calculation result in the ETS apparatus 12, and if an abnormality is detected, the car 5 is diagnosed. Since the operation is performed and the presence or absence of abnormality in the governor encoder 9 is diagnosed by comparing the information obtained by the operation control device 7 and the information obtained by the ETS device 12 during the diagnosis operation, a position information abnormality is detected. When it is done, it can be identified whether the governor encoder 9 is normal. Thereby, the operation conditions of the car 5 can be set appropriately.

  Further, the monitoring overspeed pattern in the ETS device 12 is set so as to continuously decrease toward the terminal floor near the terminal floor, and the allowable collision speed of the car shock absorber 17 and the counterweight buffer 18 is , The speed decelerated by the ETS device 12 is set, and the maximum speed during normal running is set higher than the allowable collision speed of the car shock absorber 17 and the counterweight shock absorber 18. , 18, a shortening buffer can be used, and the vertical dimension of the hoistway can be shortened.

  Further, when a position information abnormality is detected and the governor encoder 9 is normal, the ETS device 12 sets the monitoring overspeed to be constant regardless of the car position and to be equal to or less than the allowable collision speed of the shock absorbers 17 and 18. Since the operation control device 7 changes to the pattern and makes the maximum speed of the traveling speed pattern of the car 5 lower than the monitoring overspeed after the change, the operation efficiency of the car 5 can be prevented from being lowered.

In the above example, the ETS device 12 is shown as the electronic safety monitoring device. However, the electronic safety monitoring device is not limited to this. For example, overspeed monitoring at a position other than the vicinity of the terminal floor may be performed. Moreover, the abnormality of the elevator other than the overspeed may be monitored.
Further, the diagnosis as to whether the position / velocity detector is normal can be performed by an operation control device or other independent diagnosis device.

Furthermore, although the operation control device 7 is installed in the upper part of the hoistway in FIG. 1, the installation location of the operation control device 7 may be, for example, in the hoistway, and is not particularly limited.
Also, the installation location of the electronic safety monitoring device is not particularly limited, and may be, for example, on a car.
Furthermore, the number of reference position sensors is not particularly limited.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the elevator apparatus by Embodiment 1 of this invention. It is explanatory drawing for demonstrating the diagnostic method by the diagnostic part of FIG. It is a graph which shows the pattern of the ETS monitoring overspeed set in the ETS apparatus of FIG.

Explanation of symbols

  5 car, 7 operation control device, 9 governor encoder (position speed detector), 12 ETS device (electronic safety monitoring device), 13-16 reference position sensor, 17 car buffer.

Claims (7)

A car that is raised and lowered in the hoistway,
Position speed detector for detecting car position and car speed,
A reference position sensor installed in the hoistway for detecting that the car is located at a reference position;
An electronic safety monitoring device that detects a car position and a car speed based on information from the position speed detector and the reference position sensor and monitors whether the car speed reaches a monitoring overspeed set according to the car position. And an operation control device that detects the position and speed of the car independently of the electronic safety monitoring device and controls the operation of the car,
The electronic safety monitoring device is capable of detecting a position information abnormality that is an abnormality related to car position information required by the electronic safety monitoring device,
When the position information abnormality is detected by the electronic safety monitoring device, the car is diagnosed and the information obtained by the operation control device during the diagnostic operation is compared with the information obtained by the electronic safety monitoring device. By doing so, the presence or absence of abnormality of the said position speed detector is diagnosed, The elevator apparatus characterized by the above-mentioned.   The elevator apparatus according to claim 1, wherein the position information abnormality includes an abnormality in a calculated value of a car position obtained by the electronic safety monitoring device and an abnormality in the reference position sensor. A car shock absorber for mitigating the impact of the car collision on the lower part of the hoistway;
The monitoring overspeed pattern in the electronic safety monitoring device is set to be continuously lower toward the terminal floor near the terminal floor,
The allowable collision speed of the car shock absorber is set to a speed reduced by the electronic safety monitoring device,
The elevator apparatus according to claim 1 or 2, wherein a maximum speed during normal traveling is set to be higher than an allowable collision speed of the car shock absorber.   When the position information abnormality is detected by the electronic safety monitoring device and the position speed detector is normal, the electronic safety monitoring device maintains the monitoring overspeed constant regardless of the car position, and the car buffer 4. The elevator apparatus according to claim 3, wherein the operation control device is changed to a pattern that is equal to or lower than an allowable collision speed, and the maximum speed of the traveling speed pattern of the car is made lower than the monitored overspeed after the change.   The elevator apparatus according to claim 3 or 4, wherein the operation control device causes the car to travel at a speed equal to or lower than an allowable collision speed of the car shock absorber during the diagnostic operation.   The elevator apparatus according to any one of claims 1 to 5, wherein the operation control apparatus causes the car to travel a predetermined distance in a direction away from the terminal floor during the diagnostic operation.   The electronic safety monitoring device compares at least one of a car speed and a car movement amount as information obtained by the operation control device and the electronic safety monitoring device during the diagnostic operation. The elevator apparatus in any one of claim | item 6.

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