JPS5851871B2 - elevator door - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevator overspeed protection device having an automatic return function.

A speed governor is generally used as a speed detector for overspeed protection of elevators.

In FIG. 1, the elevator car 12 is driven by a hoist 10 in conjunction with a counterweight 14.

The speed of the elevator is detected by a speed governor 11 connected to the car 12 via a lobe 13, and when overspeed occurs, the speed governor 11 operates to open and close the contact portion 1 of the speed governor.
As shown in FIG. 2, the normally closed contact 1B is opened to demagnetize the elevator control circuit contactor 2, and the contact portion 2 of this contactor is
A person opens the circuit, interrupts the elevator control circuit, and causes the elevator to stop.

In this case, once the speed governor 11 operates, the contact portion 1 will not return to the state before operation unless it is manually and mechanically reset.

When an elevator stops due to overspeed as described above, the stopping position is generally different from the boarding and alighting positions of each floor, so there is a high risk that passengers will be trapped in the elevator for a long time.

The present invention provides an overspeed protection device for an elevator that automatically resets the contacts of the speed governor to restart the elevator when the elevator stops due to overspeed, thereby preventing passengers from being trapped in the elevator. It is.

The present invention will be explained below with reference to the drawings.

FIG. 3 is a basic circuit diagram of the present invention.

In Fig. 3, IA> and 1B are the normally open contacts and normally closed contacts of the speed governor 11, 2 and 2A are the coils and contact parts of the contactor for the elevator control circuit, and 3 and 3B are the time-limiting relay coils. and its normally closed contact that closes at a certain time, 1
R is a return coil of the contact point of the speed governor 11.

Although not shown in the drawings, an automatic return mechanism for the contact portion 1 operated by a return coil 1R is added to the speed governor 11.

With the above configuration, when the elevator becomes overspeed, the governor 11 operates, and when the contact 1B opens, the contactor 2 is demagnetized, the two people are opened, the elevator control circuit is cut off, and the elevator stops. .

Also, when the contact 1B is opened, the time-limited relay coil 3 is opened, and the normally closed contact 3B is closed for a certain period of time, and the governor 11 is closed.
The contact section return coil 1R is pivoted.

At this time, the speed governor 11 is stopped, so its contact 1
The automatic return mechanism operates by 1R to return the touch point part 1.

Therefore, the normally closed contact 1B closes and the contactor coil 2 is energized again to close the two contact parts, thereby re-engaging the elevator control path and restarting the elevator.

As described above, when the elevator stops due to overspeed, it is possible to restart the elevator in a stratified manner for a certain period of time, so passengers are no longer trapped inside the elevator.

FIG. 4 is a circuit diagram showing a modified example of the basic circuit shown in FIG. 3, in which the number of restarts after an overspeed stop is limited to one time.

In the case of FIG. 4, when the return coil 1R is energized in the same way as in FIG. At the same time, the return coil 1R is opened, so
If the overspeed stop occurs again, the restart will not be performed.

As a result, if there is an abnormality in the elevator circuit, it is possible to prevent repeated attempts to restart the elevator.

The above-mentioned self-holding can be canceled if necessary using the push button switch FB located in the electrical room.

FIGS. 5 and 6 show other variations.

In FIG. 5, the 4B contact of the 1R circuit shown in FIG. 4 is inserted into the circuit of coil H of a contactor for high-speed operation.

As a result, the overspeed stop layer is restarted at low speed, and the elevator can be safely stopped at the boarding and alighting position.

In FIG. 6, the circuit 4B shown in FIG. 5 is inserted into the speed pattern circuit of the elevator, and as in the case of FIG. 5, the restart operation can be performed at an appropriate low speed.

As explained above, according to the present invention, it is possible to obtain an elevator overspeed protection device that can detect overspeed and stop the elevator, and restart the stratified elevator at a certain time to safely stop the elevator at an appropriate floor. can.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the main parts of an elevator overspeed protection method, Fig. 2 is a circuit diagram of a conventional overspeed protection device, and Fig. 3 is a circuit showing an embodiment of the overspeed protection device according to the present invention. figure,
FIG. 4, FIG. 5, and FIG. 6 are circuit diagrams showing other embodiments. 1... Speed governor contact part, 1R... Speed governor return coil, 2... Control circuit contactor, 3...
...Time-limited relay, 4...Auxiliary relay, 11.
... Speed governor, 12 ... Elevator car,
13...Rope.

Claims (1)

[Claims] 1. An elevator overspeed protection device consisting of a speed governor that operates due to the overspeed of the elevator and stops the elevator, and an automatic return circuit that restarts the elevator by restoring the operation of the speed governor after a certain time limit in the elevator stop layer.