CN-117923260-B - Elevator, control device for elevator and control method for elevator

Abstract

The invention provides an elevator, a control device of the elevator and a control method of the elevator, which can improve the safety when detecting reverse running and braking a car in maintenance operation. In an elevator (1) having a car (2), a drive device for moving the car (2), and a control device (3) for controlling the movement of the car (2), the control device (3) brakes the car (2) when detecting reverse running of the car (2) during maintenance operation, and changes the sensitivity for detecting reverse running of the car (2) according to the position of the car (2).

Inventors

• MUTO YUKI
• KIMITO NAKAGAWA
• HOTATE HISASHI

Assignees

• 株式会社日立制作所

Dates

Publication Date

20260512

Application Date

20231018

Priority Date

20221026

Claims (7)

1. 1. An elevator having a car, a drive device for moving the car, and a control device for controlling movement of the car, characterized in that, The control device brakes the car when detecting reverse running of the car during maintenance operation, and changes the sensitivity of detecting reverse running of the car according to the position of the car.
2. 2. An elevator according to claim 1, characterized in that, The control device determines that the vehicle is traveling in reverse when the car is lowered by a distance equal to or greater than a lowering determination threshold value in the upward movement instruction, and the lowering determination threshold value when the position of the car is low is smaller than the lowering determination threshold value when the position of the car is high.
3. 3. An elevator according to claim 2, characterized in that, The control device uses a first descent determination threshold value as the descent determination threshold value when the car position is equal to or less than a first height, and uses a second descent determination threshold value, which is smaller than the second descent determination threshold value, when the car position is greater than the first height.
4. 4. An elevator according to claim 1, characterized in that, The control device determines that the vehicle is traveling in reverse when the car is raised by a distance equal to or greater than a raising determination threshold in the lowering operation instruction, and the raising determination threshold when the position of the car is high is smaller than the raising determination threshold when the position of the car is low.
5. 5. An elevator according to claim 4, characterized in that, The control device uses a first ascent determination threshold value as the ascent determination threshold value when the car position is equal to or greater than a second height, and uses a second ascent determination threshold value when the car position is less than the second height, the first ascent determination threshold value being less than the second ascent determination threshold value.
6. 6. A control device for an elevator, which controls the movement of a car of the elevator, the control device for an elevator is characterized by comprising: a reverse travel determination unit that detects reverse travel of the car during maintenance operation, and A maintenance travel instruction unit that controls, when the reverse travel determination unit detects reverse travel of the car during the maintenance operation, the car so as to brake the car, The reverse travel determination unit changes the sensitivity of detecting reverse travel of the car according to the position of the car.
7. 7. A control method of an elevator, which controls movement of a car of the elevator, characterized in that, When the reverse running of the car is detected during the maintenance operation, the car is braked, and the sensitivity of detecting the reverse running of the car is changed according to the position of the car.

Description

Elevator, control device for elevator and control method for elevator Technical Field The present invention relates to an elevator, an elevator control device, and an elevator control method. Background The case where the car is lowered in the upward movement instruction of the elevator or the car is raised in the downward movement instruction is referred to as reverse travel. As a technique related to reverse travel at the time of starting an elevator, for example, in the abstract of patent document 1, there is described, as a problem, "providing an elevator abnormality detection device capable of detecting a reverse impact felt at the time of starting an elevator", a solution means comprising a reverse travel detection unit 15 for comparing a travel direction command signal of an elevator signal input unit 11 with an actual travel direction signal to detect reverse travel at the time of starting, a travel speed calculation unit 12 for calculating a travel speed with a pulse signal of a rotary encoder at the time of reverse travel, an acceleration calculation unit 13 for calculating an acceleration from the travel speed, and a comparison determination unit 14 for comparing the acceleration with a prestored abnormality determination value. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 2007-169002 Disclosure of Invention Technical problem to be solved by the invention However, patent document 1 describes a case of detecting reverse running in order to detect a perceived reverse impact at the time of starting an elevator and a case of obtaining acceleration at the time of reverse running, but does not consider maintenance operation. The invention provides an elevator, a control device of the elevator and a control method of the elevator, which can improve the safety when detecting reverse running and braking a car in maintenance operation. Technical means for solving the technical problems In order to solve the above problems, an elevator according to the present invention is an elevator including, for example, a car, a drive device for moving the car, and a control device for controlling movement of the car, wherein the control device brakes the car when detecting reverse running of the car during maintenance operation, and changes a sensitivity for detecting reverse running of the car according to a position of the car. The elevator control device of the present invention is a control device for an elevator, for example, for controlling movement of a car of the elevator, and is characterized by comprising a reverse travel determination unit for detecting reverse travel of the car during maintenance operation, and a maintenance travel instruction unit for controlling the car to brake when the reverse travel determination unit detects reverse travel of the car during maintenance operation, wherein the reverse travel determination unit changes the sensitivity for detecting reverse travel of the car according to the position of the car. In addition, the elevator control method of the present invention is, for example, a control method of an elevator for controlling movement of an elevator car, and is characterized in that when reverse travel of the car is detected during maintenance operation, the car is braked, and sensitivity for detecting the reverse travel of the car is changed in accordance with a position of the car. Effects of the invention According to the present invention, by changing the sensitivity of detecting reverse travel of the car according to the position of the car, safety in detecting reverse travel and braking the car during maintenance operation can be improved. Drawings Fig. 1 is a functional block diagram of an elevator of an embodiment. Fig. 2 is a diagram illustrating an elevator according to an embodiment, a descent determination threshold value, and a ascent determination threshold value. Fig. 3 is a flowchart illustrating one example of the control flow of the elevator of the embodiment. Detailed Description Hereinafter, embodiments of the present invention will be described using the drawings. In the drawings, the same or similar constituent elements are denoted by the same reference numerals, and repetitive description thereof will be omitted. Fig. 1 is a functional block diagram of an elevator of an embodiment. The elevator 1 of example 1 includes a car 2 (not shown in fig. 1 and see fig. 2), a drive device that moves the car 2, and a control device 3 that controls movement of the car 2. The driving device for moving the car 2 includes an inverter 4 controlled by the control device 3 and a hoisting machine 5 driven by the inverter 4. The car 2 is connected in balance with the counterweight by ropes, and the elevator 1 moves the car 2 by driving the ropes with the hoisting machine 5. The basic structure and basic operation of the elevator 1 are the same as those of a general elevator, and therefore, detailed description thereof is omitted.