JPS6127312B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a device for ensuring the safety of an elevator.

The opening and closing of the elevator car door is controlled by a door drive motor, and the door is kept closed to ensure safety while the car is running. If the car door opens even slightly for some reason while the car is running, the car comes to an emergency stop to ensure the safety of the passengers inside the car.

However, when a car makes an emergency stop, it does not necessarily stop at a floor position, but may naturally stop between floors. If the car stops between floors, the passengers will be trapped inside the car, giving them a great sense of anxiety.

The present invention is intended to improve the above-mentioned problems, and aims to provide a safety device for an elevator that prevents an unnecessary emergency stop when a door opens while the car is running.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In Figure 1, 1 is a disc connected to a door drive motor (not shown) installed on the top of a car (not shown) via a speed reduction mechanism (not shown), and 2 is connected to disc 1. Link mechanism, 3 is link mechanism 2
4 is a roller pivotally connected to the upper part of the car door 3; 5 is a roller 4 fixed to the car;
6 is a first detection movable contact for detecting the open/closed state of the door, which is attached to the disc 1; 7 is a second detection movable contact, which is also attached a little closer to the door open side than the first detection movable contact 6. Contact 8 is a fixed contact attached to the fixed part, and when the car door 3 is fully closed, contacts 6 and 7 both contact the contact 8, and the car door 3
When the contact point 6 starts to open, the contact point 7 moves away from the contact point 8 in this order.

In Figure 2, (+) and (-) are DC power supplies, 9 is the first detection relay, 9a is its normally open contact, 9b and 9b are also normally closed contacts, 10 is the second detection relay, 10
a and 10b are normally open contacts; 11a and 11b are car position relay contacts that open when the car reaches the floor where it should stop; 12 is a group of conditional contacts that close when departure conditions are met and safety is confirmed; 13 is a running command relay that issues a running command when energized and issues an emergency stop command when deenergized; 13a and 13b are normally open contacts, 13c is also a normally closed contact, and 14 issues a stop command when energized. A stop command relay that emits 1
4a is its normally open contact, 15 is a stop condition contact group that closes when the normal stop conditions are met, 16 is a starting condition detection relay that detects the closing of the condition contact group 12, 16
a, 16b are normally open contacts; 17 is a low-speed running command relay that issues a low-speed running command when energized; 17
A is its normally open contact, and 17b is its normally closed contact. The contact 6 and the first detection relay 9 form the first door open detection circuit, the contact 7 and the second detection relay 10 form the second door open detection circuit, and the contact 9b and the stop command relay 14 form the nearest door open detection circuit. The floor stop circuit is connected to contact 10a,
13a, 11a, 17b, 16a and the travel command relay 13 form an emergency stop circuit, and the contact 13
c, 10b, 9c, 16b, 11b and the low-speed running command relay 17, and the contact 17a and the stop command relay 14 constitute a low-speed running circuit, respectively.

Next, the operation of this embodiment will be explained.

When the car is stopped on the floor and the car door 3 is closed, the first and second detection contacts 6 and 7 are closed (meaning that they are in contact with the fixed contact 8).
However, the first and second detection relays 9, 10 are energized, contacts 9a, 10a, 10b are closed, and contact 9
b and 9c are open. In this state, when the starting conditions are met and safety for traveling is confirmed, the conditional contact group 12 is closed, the starting condition detection relay 16 is energized, and the contacts 16a and 16b are closed. Contact 16
At the closure of a (+)-9a-11a-17b-16a
-13-(-) circuit causes travel command relay 13
is energized and self-retains by closing contact 13a. Further, the contact 13b is also closed, and the contact 13c is opened. When the car travels and approaches a called floor, the stop condition contact group 15 is closed, the stop command relay 14 is energized, and is self-held by closing the contact 14a. This will issue a stop command to the car,
The car stops at the called floor. At this time, since the car position relay contact 11a is opened, the travel command relay 13 is deenergized, the contacts 13a and 13b are opened, and the contact 13c is closed. The stop command relay 14 is deenergized by opening the contact 13b, and the contact 14
a is released and returns to the initial state. These are normal operations.

Currently, while the car is running, for some reason the car door 3
Suppose that it opens slightly. When the car door 3 opens, the disc 1 rotates from the position shown in FIG. 1 in the direction of the arrow, and the first detection contact 6 opens (the second detection contact 7 remains closed). The first detection relay 9 is deenergized, the contact 9a is opened, and the contacts 9b and 9c are closed. Even if the contact 9a is opened, the running command relay 13 is self-held, so the car continues to operate. On the other hand, due to the closure of contact 9b, stop command relay 14
is energized and self-maintained by the above circuit. Therefore, the car will stop at the nearest floor. When the car reaches the nearest floor, the run command relay 13 and stop command relay 14 are deenergized as described above, returning to the initial state.

If the car door is opened wider than in the above case while the car is running, and the second detection contact 7 is also opened, the second detection relay 10 is also deenergized and the contact 10 is opened.
a and 10b are open. As a result, the running command relay 13 is deenergized, so an emergency stop command is issued to the car, and the car suddenly stops to ensure the safety of passengers.

Furthermore, after the car suddenly stops, if the car door 3 moves in the door closing direction for some reason and the second detection contact 7 closes, the second detection relay 10 is energized and the contacts 10a and 10b are closed. . Even if the contact 10a is closed, the travel command relay 13 is not energized because the contact 13a is open, but (+)-13c-10b
-9c-16b-11b-17-(-) circuit energizes low-speed running command relay 17, and contact 1
7a is closed, and contact 17b is opened. By energizing the low speed running command relay 17, the car is restarted and runs at low speed. On the other hand, the stop command relay 14 is energized by closing the contact 17a, and the car stops at the nearest floor. When the car reaches the nearest floor, contact 11
b is opened, the low speed running command relay 17 is deenergized, the contact 17a is opened, the relay is deenergized, and the initial state is returned. Note that while the low speed running command relay 17 is energized, the contact 17b is open and interlocked to prevent normal speed (high speed) operation.

Furthermore, while the car is running, it has been explained that if the first detection contact 6 opens, it will be stopped at the nearest floor, but in express zones where there are no landings, the car will run long distances with the car door 3 open. It is a danger. Therefore, in such a case, it is safer and easier to run the vehicle at low speed to the nearest floor.

Further, the first and second detection contacts 6 and 7 are not limited to those in the embodiment, and of course, other types may be used as long as they can detect that the car door 3 is opened.

As explained above, in this invention, when the car door opens slightly while the car is running, the car is stopped at the nearest floor, and when the car door opens further, the car is brought to an emergency stop. It is possible to ensure double safety by making an emergency stop in case of danger without having to stop the car, and even after an emergency stop, if the car door is closed to a non-hazardous state, the car will run at low speed and reach the nearest floor. Since the car is stopped, it is possible to prevent passengers from being trapped in the car more than necessary.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an elevator safety device according to the present invention, and FIG. 2 is a circuit diagram of FIG. 1. 3...Car door, 6...First detection movable contact for detecting door open/closed state, 7...Second detection movable contact on the same left,
9...First detection relay, 10...Second detection relay, 13...Travel command relay, 14...Stop command relay, 17...Low speed travel command relay. Note that the same parts in the figures are indicated by the same reference numerals.

Claims (1)

[Claims] 1. A first door open detection circuit that operates when the car door opens slightly while the car is running, and a second door that operates when the car door opens further beyond the operating position of the first door open detection circuit. an open detection circuit, a nearest floor stop circuit that stops the car at the nearest floor when the first door open detection circuit operates, an emergency stop circuit that stops the car in an emergency when the second door open detection circuit operates; A safety device for an elevator, comprising: a low-speed running circuit that gives a low-speed running command to the car and causes it to run to the nearest floor when the second door open detection circuit becomes inoperable after the car is stopped by an emergency stop circuit.