JPH07137950A - Safety switch short-circuiting device for elevator - Google Patents

Abstract

PURPOSE:To provide a device for short-circuiting a safety switch for an elevator, which can check the operation of the safety switch through remote control without using an interphone and without carrying out a complicated preparatory work, and which can prevent an existing elevator device from being affected. CONSTITUTION:A safety switch short-circuiting device comprises a transmitter 1 having switching parts 1a, 1b, for delivering electromagnetic waves 2 having predetermined frequencies, and a receiver 3 incorporating a wave discriminating device 3c for detecting the electromagnetic waves 2. Further, the receiver 3 incorporates relays 3A, 3B, normally open contacts 3Aa, 3Bb, transistors Tra, Trb, clip terminals 4a, 4b and the like, and accordingly, a safety switch can be short-circuited only in a period in which the receiver 2 receives the electromagnetic wave 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety switch short-circuit device for an elevator used for checking the operating condition when a safety switch for detecting an abnormality in the elevator is activated.

[0002]

2. Description of the Related Art In order to operate an elevator safely, it is necessary to regularly inspect the operation of each part of the apparatus. However, it is not enough to perform such an operation inspecting work for each part that operates during normal operation. Therefore, it is necessary to check the operation and operating status of the safety switch that operates when the elevator is abnormal.

Therefore, in order to check the operating condition when the safety switch is operated, the conventional method is disclosed in Japanese Patent Laid-Open No. 3-177285.
As described in the publication, a safety switch short-circuit device for an elevator using an intercom circuit has been proposed. This prior art is provided with a detecting means for detecting a calling state of an intercom installed in a machine room, and a short-circuiting means for short-circuiting a safety switch only while the detecting means detects the calling state of the intercom. When the intercom in the machine room is not in the ringing state, it is kept in the same state as when the safety switch was activated, that is, the state in which the operation stop command was issued by the safety switch, but the operator presses the intercom call button in the car. When the intercom in the machine room is put into the calling state, the detection means detects it and the short-circuit means short-circuits the safety switch, so that the above-mentioned operation stop command is released, so that the car is operated via the elevator control device. You can do it. Therefore, even a single worker can perform the operation inspection work when the safety switch is activated, and the car can be operated only while the intercom call button is pressed, so that the safety during the work can be secured.

[0004]

However, in the above-mentioned prior art, in order to prevent the intercom installed outside the manager's room or the like from ringing even if the intercom call button in the car is pressed, Part of it must be left open, or else it must be explained to the administrator not to pick up the handset even if the intercom rings, and in any case, the preparation work prior to the actual operation inspection work is complicated. There was a problem that was. Further, since the above-described conventional technology uses an intercom circuit, in the case of an intercom that uses a battery as a power source, the battery is greatly consumed and, for example, when an accident such as trapping in a car occurs. There was a risk that the intercom could not be used.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to perform an operation inspection work at the time of operating the safety switch without performing a complicated preparatory work and to provide an existing elevator apparatus. Does not adversely affect the
An object is to provide a safety switch short-circuit device for an elevator.

[0006]

SUMMARY OF THE INVENTION The above object of the present invention is an elevator in which a control device stops the operation of a car when a safety switch for detecting an abnormality in the elevator is activated, and an operating condition when the safety switch is activated. In the safety switch short-circuit device of the elevator used to check the, a transmitter that has a switching unit and outputs an electromagnetic wave of a predetermined frequency when switched on, and a receiver that receives the electromagnetic wave of the predetermined frequency, And a short-circuit means for shorting the safety switch to prevent a car stop command by the safety switch only while the receiver is receiving the electromagnetic wave of the predetermined frequency.

[0007]

According to the above means, the receiver is installed in the vicinity of the control device of the elevator and the short-circuit means is connected to the receiver, so that the same state as when the safety switch is activated can be obtained when the transmitter is not switched on. It can be set so that the safety switch is short-circuited and the operation stop command is blocked when the electromagnetic wave of a predetermined frequency is output from the transmitter, so that the operator with the transmitter can remove it from the car. It is possible to perform operation inspection work when the safety switch is activated by remote operation, and because the receiver can detect electromagnetic waves output by the transmitter without using an intercom of the elevator, it can be operated remotely. There is no risk of adversely affecting the device.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is a circuit diagram showing a short circuit of a safety switch in the present embodiment, and FIG. 2 is a block diagram showing a safety switch short-circuit device used in the same embodiment.

In these figures, reference numeral 1 is a transmitter having switching sections 1a and 1b, 2 is an electromagnetic wave of a predetermined frequency output from the transmitter 1, and 3 is a receiver for receiving the electromagnetic wave 2. , The transmitter 1 is the switching unit 1
When the switch a is pushed in and turned on, the electromagnetic wave 2 of 300 MHz is outputted, and when the switch 1b is pushed and turned on, the electromagnetic wave 2 of 350 MHz is outputted.
Can be switched on at the same time.

On the other hand, the receiver 3 outputs the signal to the amplifier 3a when detecting the electromagnetic wave 2 of 300 MHz and outputs the signal to the amplifier 3b when detecting the electromagnetic wave 2 of 350 MHz. A transistor Tra connected to the amplifier 3a and the power supply N and having a collector connected to the power supply P via the relay 3A; and a base and an emitter connected to the amplifier 3b and the power supply N, respectively, and a collector connected to the relay 3B. Transistor Trb connected to the power source P and the relay 3
It is mainly configured by the normally open contact 3Aa of A and the normally open contact 3Ba of the relay 3B, and the normally open contacts 3Aa and 3Ba.
Clip terminals 4a and 4b via terminals 3d, respectively.
Are connected.

Between the power sources P and N, the normally closed contact 5b and the normally closed contact 6b, which are safety switches for the elevator, are provided.
Is connected to a safety detection relay 7 which has a normally open contact 7a and enables the operation of the car only when energized, and the normally open contact 7a is connected to an elevator control circuit 8. The normally closed contact 5b is connected to the terminals 5b1 and 5b2, and the normally closed contact 6b is connected to the terminals 6b1 and 6b2.

Next, a description will be given of a procedure for carrying out an operation inspection work when the safety switch is operated by using the transmitter 1 and the receiver 3.

First, an operator installs the receiver 3 near a control panel (not shown) in the elevator machine room, connects the power supply terminals of the receiver 3 to the power supplies P and N, and connects the clip terminal 4a to the terminal. 5b1 and 5b2, and the clip terminal 4b is connected to terminals 6b1 and 6b2. Next, the normally closed contact 5b and the normally closed contact 6b are opened to set the safety switch to the activated state, and then the operator gets in the car and turns on the low speed operation switch (not shown) to prevent the car from starting. To confirm.

When the operator operates the car after canceling the operation stop command by the safety switch, the transmitter 1
The switching parts 1a and 1b of 1 are pressed together to output two kinds of electromagnetic waves 2 of 300 MHz and 350 MHz. Then, the electromagnetic wave discriminating device 3c of the receiver 3 which has detected the electromagnetic wave 2 outputs a signal to the amplifiers 3a and 3b, respectively, so that both the transistors Tra and Trb are turned on and the circuit of P-3A-Tra-N is formed. P-3B
-Trb-N circuit is formed. Therefore, the relays 3A and 3B are energized and the normally open contact 3Aa and the normally open contact 3Ba are both closed, and P-5b1-4a-
3d-3Aa-3d-4a-5b2-6b1-4b-3
When the circuit of d-3Ba-3d-4b-6b2-7-N is formed and the safety switch is short-circuited and the safety detection relay 7 is energized, the circuit of P-7a-8-N is formed. Since the control circuit 8 is energized, the car can be operated via the control circuit 8. In other words, the operator in the car can switch to the state in which the safety switch is short-circuited and the operation stop command is released while the switching units 1a and 1b of the transmitter 1 are both switched on. By turning on a low speed operation switch (not shown), the car can be run.

As described above, according to the present embodiment, if one of the switching units 1a and 1b of the transmitter 1 is not switched on, the operation stop command is issued in the same manner as when the safety switch is activated. Moreover, if both switching parts 1a and 1b are turned on, the safety switch can be short-circuited and the operation stop command can be set to the released state, so that the operator with the transmitter 1 can operate remotely from the car and is safe. The operation stop command can be issued and canceled by the switch, so that even a single worker can perform the operation inspection work when the safety switch is activated without any trouble. Further, in the present embodiment, the safety switch is short-circuited and the car can be operated only when the two switching parts 1a and 1b are pushed in together, so that safety during work is also ensured. Furthermore, in this embodiment, the intercom of the elevator is not used, and the receiver 3 can detect the electromagnetic wave 2 of the predetermined frequency output by the receiver 3 for remote control, so that a part of the intercom circuit can be opened. There is no need to perform complicated preparatory work such as explaining to a manager in advance, work efficiency is improved, and there is no risk of adversely affecting the existing elevator system, so inspection work can be performed with peace of mind.

[0016]

As described above, in the elevator safety switch short-circuit device according to the present invention, when the receiver receives the electromagnetic wave of the predetermined frequency output from the transmitter, the safety switch is short-circuited and the operation stop command can be released. , The operator in the car with the transmitter can perform the operation check work when the safety switch is operated by remote control alone, and since the existing equipment such as the intercom of the elevator is not used, the operation check work is performed before the operation. This eliminates the need for complicated preparatory work, and has an excellent effect of not adversely affecting the existing elevator system.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a short circuit of a safety switch in this embodiment.

FIG. 2 is a block diagram showing a safety switch short-circuit device used in the embodiment.

[Explanation of symbols]

 1 transmitter 1a, 1b switching part 2 electromagnetic wave 3 receiver 3c electromagnetic wave discriminating device 3A, 3B relay 3Aa, 3Ba (of relays 3A, 3B) normally open contact 3d terminal 4a, 4b clip terminal 5b, 6b normally closed contact (safety switch ) 5b1, 5b2, 6b1, 6b2 terminal 7 safety detection relay 8 elevator control circuit Tra, Trb transistor

Claims (4)

[Claims] 1. An elevator safety system in which a control device stops the operation of a car when a safety switch for detecting an abnormality in the elevator is activated, and the safety of the elevator system is used to check the operating condition when the safety switch is activated. In a switch short-circuit device, a transmitter that has a switching unit and outputs an electromagnetic wave of a predetermined frequency when switched on, a receiver that receives the electromagnetic wave of the predetermined frequency, and a receiver that receives the electromagnetic wave of the predetermined frequency. A safety switch short-circuit device for an elevator, comprising: a short-circuit means for short-circuiting the safety switch to prevent an operation stop command by the safety switch only while the safety switch is on. 2. The safety switch short-circuit device for an elevator according to claim 1, wherein the receiver is detachably installed near the control device for use. 3. The electromagnetic wave according to claim 1, wherein the transmitter has a plurality of switching units respectively corresponding to electromagnetic waves having different frequencies, and when these switching units are switched on together, a plurality of types of electromagnetic waves having different frequencies are provided. Is configured to be simultaneously output from the transmitter. An elevator safety switch short-circuit device. 4. The structure according to claim 3, wherein the short-circuit means short-circuits the safety switch only when the receiver simultaneously receives a plurality of types of electromagnetic waves having a predetermined frequency. Elevator safety switch short circuit device.