JPS6351952B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a device for confirming the safety of an elevator.

[Prior art]

In recent years, with the progress of semiconductor technology, feedback control of induction motors has become popular. That is,
The speed of the motor is controlled by comparing the speed command signal with the speed signal from the speedometer generator. In order to reduce the number of detection and electromagnetic contactors, it is conceivable to perform AC feedback control even during manual operation.

At that time, it goes without saying that it is necessary to perform various safety checks (especially regarding speed signal abnormalities), just as in automatic driving. For example, JP-A No. 57-42470
As shown in the above publication, the number of sudden stops of the car due to an abnormality is monitored and measures are taken for subsequent startup, and this will be explained with reference to FIG.

That is, it is determined in step (1) whether the safety confirmation circuit has operated, and if it has not operated, no further action will be taken. If it is determined that the car has operated, a sudden stop command is issued in step (2), and the car suddenly stops. In step (3), the number of sudden stop commands is counted, and the first sudden stop is counted as 1. In step (4), it is determined whether the above count is 2 or more. Since this field is less than 2, it is possible to restart the car after a predetermined time in step (5),
The car resumes operation.

When the second sudden stop command is issued, the number of times the sudden stop command has been issued is counted as 2 in step (3). with this,
Proceeding from step (4) to step (6), the restart of the car is prevented. In other words, the sudden stop occurred twice.
Since it was predicted that some kind of abnormality had occurred, the system was designed to prevent the car from restarting before conducting an inspection.

However, in this case, even if the safety confirmation circuit operates while the installation worker or maintenance person is operating the car manually, the same operation will occur, and if the sudden stop command is issued a predetermined number of times, the car will not be able to start. If the above situation occurs in a location where the distance between floors is long and there is no landing, there is a possibility that the worker or maintenance staff will be unable to escape.

[Summary of the invention]

This invention is intended to improve the above-mentioned problem, and when the safety confirmation circuit is activated during manual operation, the system suddenly stops but does not prevent restart.
An object of the present invention is to provide a safety device for an elevator that allows workers or maintenance personnel to easily escape.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

First, an overview of the operation of this embodiment will be explained with reference to FIG.

Similarly to the case in FIG. 1, when a sudden stop command is issued in step (2), it is determined in step (7) whether or not automatic operation is to be performed. If automatic operation is determined, restarting of the car is prevented through steps (3), (4), and (6) similar to those in FIG. 1 when the number of times sudden stop commands have been issued reaches two. If manual operation is determined in step (7), proceed to step (5).
The car can be restarted after a predetermined time.

In Fig. 3, (+) and (-) are DC power supplies, and 11 is an abnormality detection relay contact that is normally closed and opens when the safety confirmation circuit is activated, and closes after a certain period of time after the car stops.
12 is a sudden stop command relay that issues a sudden stop command when deenergized; 12a and 12b are its normally open contacts;
2c is a normally closed contact, 13a is a timed relay contact that opens after a predetermined time has elapsed after the power is turned on, 13b is a timed relay contact that similarly closes, and 14 is a manual operation relay contact that opens during automatic operation and closes during manual operation. 15 is a sudden stop command one time counting relay, 15a
is its normally open contact, 15b is its normally closed contact, and 16
is a sudden stop command one count memory relay, 16a, 1
6b is its normally open contact; 17 is a sudden stop command two-time counting relay that prevents restarting of the car when energized; and 17a is its normally open contact.

Next, the operation of this embodiment will be explained.

During automatic operation, the manual operation relay contact 14 is open. Further, since the abnormality detection relay contact 11 is closed, the sudden stop command relay 12 is energized, the contacts 12a and 12b are closed, and the contact 12c is open. Also, when the power is turned on, (+)-13
In the circuit a-15-(-), the sudden stop command one-time counting relay 15 is energized and self-maintained by closing the contact 15a. Further, the contact 15b is open. The other relays 16, 17 are deenergized.

When the safety confirmation circuit operates and the abnormality detection relay contact 11 opens, the sudden stop command relay 12 is deenergized, contacts 12a and 12b open, and contact 12c
is closed. At this time, the time limit relay contact 13a is already open and the same contact 13b is closed, but since the manual operation relay contact 14 is open, the sudden stop command one-time counting relay 15 is deenergized, and the contact 15
a is open and contact 15b is closed. On the other hand, as the sudden stop command relay 12 is deenergized, the car suddenly stops. After a certain period of time after the car is stopped, the abnormality detection relay contact 11 is closed again, the sudden stop command relay 12 is energized, the contacts 12a and 12b are closed, and the contact 12c is closed.
is open. By closing the contact 12b, (+)-
In the circuit 15b-12b-16-(-), the sudden stop command one count memory relay 16 is energized, and the contact 1
It maintains itself by closing 6a. In addition, contact 16
b is closed.

When the abnormality detection relay contact 11 is opened again while the car is restarted and in operation, the sudden stop command relay 12 is deenergized and the car suddenly stops again. Then, when the contact 12c closes, (+)-16b-12c-
17-(-) circuit, the sudden stop command two-time counting relay 17 is energized and self-maintained by closing the contact 17a. The car will now be prevented from restarting and will wait for an attendant to inspect it.

During manual operation, the manual operation relay contact 14 is closed. Therefore, (+)-13b-14-15-
Since the sudden stop one time counting relay 15 is held in the (-) circuit, no matter how many times the sudden stop command relay 12 is deenergized, the sudden stop command one time counting relay 15 will not be deenergized. Therefore, the sudden stop command two-time counting relay 17 is not energized, and the car is not prevented from starting.

Manual operation is performed by an elevator specialist, so it is possible to operate the elevator while confirming safety. Therefore, it can be said that it is more desirable in terms of elevator management to enable restarting than to prevent restarting.

In the embodiment, restarting is prevented when a sudden stop command is issued twice, but the number of times is not limited to two.

〔Effect of the invention〕

As described above, in this invention, during automatic operation of an elevator, if the number of sudden stops exceeds a predetermined value, restarting of the car is prevented, and although sudden stops occur during manual operation, the car is restarted regardless of the number of sudden stops. Since the start-up is made possible, it is possible to eliminate the problem of the operator or maintenance personnel not being able to escape after a sudden stop.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the operation of a conventional elevator safety device, FIG. 2 is an explanatory diagram of the operation of an embodiment of the elevator safety device according to the present invention, and FIG. 3 is a circuit diagram. 11...Abnormality detection relay contact, 12...Sudden stop command relay, 14...Manual operation relay contact, 15...Sudden stop command 1 time count relay, 16...Sudden stop command 1 time count memory relay, 17...Sudden stop command 2 times count relay. Note that the same reference numerals in the figures indicate the same parts.

Claims (1)

[Claims] 1. When an abnormality is detected during automatic operation or manual operation of the car, the above-mentioned car is suddenly stopped, and during the above-mentioned automatic operation, the number of sudden stops is counted by a counter, and when the output reaches a predetermined value, the above-mentioned car is stopped suddenly. The car, which is designed to prevent restarting, is equipped with a manual operation contact that operates during the manual operation, and a circuit that makes the counter insensitive when the manual operation contact operates, and enables the restart of the suddenly stopped car. An elevator safety device characterized by: