Elevator apparatus

Patent metadata

Field	Value
Publication number	US-10858218-B2
Application number	US-201515743407-A
Country	US
Kind code	B2
Filing date	Jul 22, 2015
Priority date	Jul 22, 2015
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

This invention is concerning an elevator apparatus, in which a safety monitoring device corrects a detected car position using a signal from a car position detection device and monitors the presence or absence of car overspeed on the basis of an overspeed detection pattern that varies in accordance with car position. The car position detection device includes a first car position detection sensor and a second car position detection sensor which are arranged side by side in a vertical direction. The safety monitoring device performs, in parallel, first overspeed monitoring based on a car position corrected using a signal from the first car position detection sensor and second overspeed monitoring based on a car position corrected using a signal from the second car position detection sensor.

First claim

The invention claimed is:

1. An elevator apparatus comprising:
a car which ascends and descends in a hoistway;
a reference position detector which detects that the car is located at a reference position in the hoistway;
a movement signal generator which generates a signal that corresponds to an amount of movement of the car;
a detection member which is installed in the hoistway;
a car position detection device which is mounted on the car and detects the detection member; and
a safety monitoring device which detects a car position from an amount of movement of the car from the reference position, corrects the detected car position using a signal from the car position detection device, and monitors the presence or absence of overspeed of the car on the basis of an overspeed detection pattern that varies in accordance with a car position, wherein
the car position detection device includes a first car position detection sensor and a second car position detection sensor which are adjacent, and one of the first and second car position detection sensors is above another of the first and second car position detection sensors, and
the safety monitoring device performs, in parallel, first overspeed monitoring based on a car position corrected using a signal from the first car position detection sensor and second overspeed monitoring based on a car position corrected using a signal from the second car position detection sensor.

2. The elevator apparatus according to claim 1 , wherein
the safety monitoring device compares the car position corrected using the signal from the first car position detection sensor and the car position corrected using the signal from the second car position detection sensor and determines that an abnormality has occurred when the difference between the two corrected car positions is greater than a set value.

3. The elevator apparatus according to claim 1 , wherein:
a top floor and a bottom floor are set as the reference position,
the reference position detector is usually-closed, positive opening switches,
the overspeed detection pattern is set so as to become gradually lower as the car approaches an upper end and a lower end of the hoistway, and
the safety monitoring device stores learned values, which are results of measuring distances to reach the reference position from positions at which the detection member is detected by the first and second car position detection sensors.

4. The elevator apparatus according to claim 1 , further comprising:
a drive control device which controls running of the car, wherein
the detection member includes a plurality of floor plates respectively disposed at positions corresponding to a plurality of stopping floors,
the first and second car position detection sensors are first and second landing sensors, and
the drive control device sets positions, at which the floor plates are detected by both the first landing sensor and the second landing sensor, as landing target positions.

5. The elevator apparatus according to claim 4 , wherein
the detection member further includes an auxiliary plate, different from the plurality of floor plates, installed in a non-landing position between floors, and
a vertical dimension of the auxiliary plate is smaller than a vertical dimension of each of the floor plates so that the auxiliary plate is not detected by both the first landing sensor and the second landing sensor at the same time.

6. An elevator apparatus comprising:
a car which ascends and descends in a hoistway;
a reference position detector which detects that the car is located at a reference position in the hoistway;
a movement signal generator which generates a signal that corresponds to an amount of movement of the car;
detection plates which are installed in the hoistway;
a car position detector which is mounted on the car and detects the detection plates; and
safety monitoring circuitry which detects a car position from an amount of movement of the car from the reference position, corrects the detected car position using a signal from the car position detector, and monitors the presence or absence of overspeed of the car on the basis of an overspeed detection pattern that varies in accordance with a car position, wherein
the car position detector includes a first car position detection sensor and a second car position detection sensor which are adjacent, and one of the first and second car position detection sensors is above another of the first and second car position detection sensors, and
the safety monitoring circuitry performs, in parallel, first overspeed monitoring based on a car position corrected using a signal from the first car position detection sensor and second overspeed monitoring based on a car position corrected using a signal from the second car position detection sensor.

7. The elevator apparatus according to claim 6 , wherein
the safety monitoring circuitry compares the car position corrected using the signal from the first car position detection sensor and the car position corrected using the signal from the second car position detection sensor and determines that an abnormality has occurred when the difference between the two corrected car positions is greater than a set value.

8. The elevator apparatus according to claim 6 , wherein:
a top floor and a bottom floor are set as the reference position,
the reference position detector is usually-closed, positive opening switches,
the overspeed detection pattern is set so as to become gradually lower as the car approaches an upper end and a lower end of the hoistway, and
the safety monitoring circuitry stores learned values, which are results of measuring distances to reach the reference position from positions at which the detection plates to be detected are detected by the first and second car position detection sensors.

9. The elevator apparatus according to claim 6 , further comprising:
drive control circuitry which controls running of the car, wherein
the detection plates are at positions corresponding to a plurality of stopping floors,
the first and second car position detection sensors are first and second landing sensors, and
the drive control circuitry sets positions, at which the detection plates are detected by both the first landing sensor and the second landing sensor, as landing target positions.

10. The elevator apparatus according to claim 9 , further comprising:
an auxiliary plate, different from the detection plates, at a non-landing position between floors, and
a vertical dimension of the auxiliary plate is smaller than a vertical dimension of each of the detection plates so that the auxiliary plate is not detected by both the first landing sensor and the second landing sensor at the same time.

Assignees

• Mitsubishi Electric Corp

Inventors

• Shibata Masunori
• Kugiya Takuo
• Washio Kazunori

Classifications

• B66B5/06 Primary

  electrical · CPC title

• B66B5/0018

  Devices monitoring the operating condition of the elevator system · CPC title

• B66B3/02

  Position or depth indicators · CPC title

• B66B5/0031 Primary

  for safety reasons · CPC title

• B66B1/3492

  Position or motion detectors or driving means for the detector (B66B1/40, B66B1/50 take precedence; length measuring G01B; speed measuring G01P) · CPC title