JPS641394B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention moves an elevator car that has stopped between floors due to a power outage or breakdown to the nearest location by controlling the electromagnetic brake of the elevator. This invention relates to an emergency rescue operation device for an elevator that is stopped at a floor.

[Conventional technology]

FIG. 1 is an explanatory diagram showing an outline of a rope elevator. In the figure, a car 10 and a counterweight 12 are connected to both ends of a rope 18 which is hung between a sheave 14 and a diverter wheel 16 in a hanging manner. The sheave 14 is coupled to an electromagnetic brake 20 and a hoist 22 via a rotating shaft,
By releasing the electromagnetic brake 20, the hoisting machine 22 can be driven to move the car 10 up and down.

In the case of an emergency such as a power outage or breakdown, an elevator with the above structure can
When the car stops in the middle of a floor, the car 10 is manually operated to the nearest floor to rescue the passengers trapped inside the car. That is, the weight of the counterweight 12 is generally set so as to balance the car 10 when the weight is approximately 1/2 of the rated weight of the car 10. Therefore,
When the electromagnetic brake is released without driving the hoisting machine 22, the car 10 is in an unbalanced state with the counterweight 12 in most cases, and therefore rises or falls. Therefore, due to a power outage or malfunction, one car
When the car 0 stops in the middle of the floor, when the electromagnetic brake is released, the sheave 14 rotates under the torque based on the imbalance between the car 10 and the counterweight 12, and raises or lowers the car 10. In addition,
When the car 10 and the counterweight 12 are in balance, the electromagnetic brake 20 is released and the hoisting machine 22 is directly operated manually to lift the car 10.
is operating.

However, in the conventional emergency operation, the electromagnetic brake is released to operate the car, but the electromagnetic brake, which is directly connected to the hoisting machine 22 in the elevator machine room, is manually and mechanically intermittent using a lever or the like. It was open and going. Therefore, it takes a lot of time and effort to rescue passengers trapped in the car. Furthermore, due to erroneous operation, the car 10 may be accelerated to a dangerous speed where the emergency stop device is activated.
or contained a risk of free fall.

Therefore, as a solution to the above-mentioned problems, there are known elevator emergency operation devices described in, for example, Japanese Patent Publication No. 53-30224 (Conventional Example 1) and Japanese Patent Publication No. 51-42391 (Conventional Example 2). ing.

[Problem to be solved by the invention]

According to Conventional Example 1, an elevator car that has stopped midway in a hoistway is made to run on its own and its speed is regulated, so that the car can land on a desired floor quickly and , the passengers inside the car can be rescued safely. however,
In the above-mentioned conventional example 1, a brake control device must be installed for each elevator, which poses problems in terms of the time and effort required for the installation and the cost of the equipment. In addition, the brake control device uses a storage battery as an emergency power source to supply power to the electromagnetic brake, and charging equipment is required to compensate for the risk of spontaneous discharge.Furthermore, considering the lifespan of the storage battery, it is necessary to perform the necessary functions when necessary. Problems also remain in terms of maintenance, such as the need for periodic replacement to prevent the system from becoming ineffective.

The above points are the same for Conventional Example 2, but
In addition, since Conventional Example 2 uses a speed detector to control the speed of the car, the structure inevitably becomes complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide an emergency rescue operation device for an elevator that can safely land a car on a desired floor without having to install it in each of a plurality of elevators installed in parallel.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a frictional force to the drive machine of an elevator car by power cut to brake the car, and releases the drive machine of the car by power supply to free the car. An emergency rescue operation device for an elevator that moves the car up and down by controlling an electromagnetic brake by alternately repeating power supply and power outage in an emergency, comprising: an AC power supply device having a detachable output terminal; and an output of the AC power supply device. An input terminal that is detachable from the terminal, an output terminal that is detachable from the terminal of the electromagnetic coil of the electromagnetic brake, a rectifier that converts the AC power into DC, an operating switch interposed between the input terminal and the rectifier, and the rectifier. a portable electromagnetic brake control device having a normally open contact interposed between the control switch and the output terminal; The invention is characterized by comprising a speed limiter that turns on and off.

[Effect]

According to the configuration of the present invention, the input terminal of the electromagnetic brake control device can be attached to and detached from the AC power supply device, and the output terminal can be attached to and detached from the terminal of the electromagnetic coil of the electromagnetic brake. The restriction device can be optionally installed or removed between the AC power supply device and the electromagnetic coil of the electromagnetic brake. This means that when multiple elevators are installed in parallel, there is no need to install an emergency rescue operation device for each elevator, and it is possible to individually connect only to the elevator in which a failure has occurred and move the failed elevator up and down. This means that it is possible to land on a predetermined floor.

When the faulty elevator is in vertical operation, a worker manually turns on the operation switch. Then, the AC power supply device is connected to the rectifier, and DC power is supplied from the rectifier to the electromagnetic coil of the electromagnetic brake via the normally open contact and the output terminal. However, the supply of this DC power is intermittent at fixed time intervals due to the on/off control of the normally open contact by the speed limiter. In other words, the electromagnetic brake is alternately cut off and supplied with power so that the car can quickly pass at a safe speed to a floor where it can be rescued.

Further, since the AC power supply device does not have the risk of spontaneous discharge such as a storage battery, it is advantageous in terms of maintenance such as charging equipment and periodic replacement, and is also excellent in reliability.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an emergency rescue operation device for an elevator according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a circuit diagram of an elevator emergency rescue operation device according to the present invention. The emergency rescue operation device of the embodiment is capable of intermittent operation of an external power supply device 30, an electromagnetic brake control device 40 that rectifies the current from the external power supply device 30, and supplies the electromagnetic brake to the electromagnetic brake, and a circuit of the electromagnetic brake control device 40 at arbitrary time intervals. It is composed of a speed limiter 50 that can be used.

The AC power supply 31 of the external power supply device 30 is connected to the interlocking switches KS ₁ and KS ₂ via terminals T ₃₂ and T ₃₃ of the external power supply device 30 and terminals T ₄₁ and T ₄₂ of the electromagnetic brake control device 40. be. Switchchi KS ₁
is connected via a fuse F to one input terminal of the rectifier ST, and KS ₂ is also connected to the other input terminal of the rectifier ST.

One terminal on the output side of the rectifier ST is connected to the cathode side of the diode D via a contact _A1 that is opened and closed by a relay to be described later. Also, the other output terminal of the rectifier ST is a variable resistor connected to the anode side of the diode D via a contact _{A2 which} is opened and closed by a relay in conjunction with contact A1.
Connected to BDR. Note that the diode D and the variable resistor BDR absorb the back electromotive force generated in the electromagnetic brake coil MGB, and the electromagnetic brake 2
This is to allow the 0 to operate smoothly.

Electromagnetic brake coil MGB for electromagnetic brake 20
In this case, one tap T ₂₅ is the electromagnetic brake control device 4.
0 is connected to the cathode of the diode D via the terminal T ₄₃ , and the other tap T ₂₆ is connected to the variable resistor BDR via the terminal T ₄₄ .

The speed limiting device 50 has a timer TM connected to a rectifier ST.
connected to the input side of the This timer TM is
Receiving current from AC power supply 31 via fuse F, opening and closing contact 51 of timer TM at arbitrary time intervals, and energizing relay A when contact 51 closes,
The contacts A ₁ and A ₂ mentioned above are closed.

In the above configuration, although details will be described later, the electromagnetic brake control device 40 and the speed control device 50
is not connected to the coil MGB of the electromagnetic brake 20 and the external power supply device 30 during normal elevator operation. That is, the electromagnetic brake control device 40
are each terminal T ₂₅ , T ₂₆ and T ₄₃ , T ₄₄ , and T ₄₁ , T ₄₂
It is removable at T ₃₂ and T ₃₃ . Therefore, when there are multiple elevators, it is not necessary to install the electromagnetic brake control device 40 and the speed control device 50 for each elevator, and it is sufficient to connect them individually to the failed elevator.

The operation of the embodiment configured as described above is as follows.

Suppose now that the elevator is stopped or its power is cut off due to a malfunction, the car 10 is stopped in the middle of the floor, and the occupants are trapped inside the car 10.
At this time, the maintenance person connects the electromagnetic brake control device 40, which is normally not connected, to the external power source 30 and the electromagnetic brake 20. That is, the maintenance person connects the input side terminals T ₄₁ and T ₄₂ of the electromagnetic brake control device 40 to the terminals of the external power supply device 30 by switching a switch or the like.
In addition to connecting to T ₃₂ and T ₃₃ , the output side terminals T ₄₃ and T ₄₄ of the electromagnetic brake control device are connected to the electromagnetic brake 2.
Connect to brake coil MGB of No. 0 via taps T ₂₅ and T ₂₆ .

Thereafter, when switches KS ₁ and KS ₂ are turned on, current from AC power supply 31 is supplied to timer TM via fuse F. The timer TM is designed to open and close (ON, OFF) the built-in contact 51 at preset time intervals.
When turned on, relay A is excited, turning on contacts A ₁ and A ₂ of electromagnetic brake control device 40.

When contacts A ₁ and A ₂ turn on, the external power supply device 30
and the electromagnetic brake 20, that is, the switch
The circuit of KS ₁ - Fuse F - Rectifier ST - Contact A ₁ - Electromagnetic brake coil MGB - Contact A ₂ - Rectifier ST - Switch KS ₂ is closed. Therefore, the current from the AC power supply 31 is rectified into DC by the rectifier ST and supplied to the electromagnetic brake coil MGB. Therefore, the electromagnetic brake coil MGB is excited and generates magnetic force, and the electromagnetic brake coil MGB
The magnetic force generated in the MGB releases the electromagnetic brake 20. Therefore, elevator car 10
begins to gradually fall or rise due to imbalance with the counterweight 12.

Then, when a predetermined time elapses, the timer TM
turns off contact 51, demagnetizes relay A, and turns off contacts A ₁ and A ₂ . For this reason, Switch KS ₁
- Fuse F - Rectifier ST - Contact A ₁ - Electromagnetic brake coil MGB - Contact A ₂ - Rectifier ST - Switch
The circuit of KS ₂ is open and the electromagnetic brake coil MGB
is demagnetized, and the electromagnetic brake 20 is activated to stop the car 10.

The above operation is repeated until the car 10 reaches the nearest floor.

FIG. 3 shows the speed of the elevator car and the state of operation of the electromagnetic brake accompanying the series of operations described above.

The timer TM connects the contact 51 as shown in Fig. 3.
Turn on for ₁ hour, then turn off for ₂ hours, then turn on again.
t It's starting to turn on for ₁ hour. Then, when the contact 51 turns ON, the electromagnetic brake coil MGB of the electromagnetic brake is excited to release the electromagnetic brake, and the elevator car 10 gradually ascends or descends from the stopped state. When _t1 hour elapses after the contact 51 is turned ON, the contact 51 is turned OFF by the timer TM, the electromagnetic brake coil MGB is demagnetized, and the electromagnetic brake is operated again. Therefore,
After the elevator car 10 reaches the maximum speed v _{p one} hour after the contact 51 is turned on, it is braked by the operation of the electromagnetic brake, rapidly decelerated, and stopped again. Then, when the time _t2 has elapsed, the contact point 51 is turned ON again, and the elevator car 10 starts moving up or down again.

As described above, the elevator car 10 is automatically operated to the nearest floor at a speed less than or equal to a predetermined constant speed v _p , so that the elevator car 10 is at a dangerous speed where the emergency stop device is activated. This can prevent the vehicle from being accelerated or colliding with the shock absorbers at the top or bottom of the elevator tower.
To easily and reliably rescue a passenger safely.

Note that the external power supply device 30, the electromagnetic brake control device 40, and the speed limiter 50 are portable.

〔Effect of the invention〕

As described above, according to the present invention, the electromagnetic brake control device that controls the vertical movement of the car by intermittent energization to the electromagnetic coil of the electromagnetic brake at fixed time intervals, and the speed control device integrated therewith, By adopting a configuration that can be attached and detached between the power supply device and the electromagnetic brake electromagnetic coil, when multiple elevators are installed in parallel, there is no need to install an emergency rescue operation device for each elevator individually. A single device can be shared in response to emergencies. This makes it possible to simplify the equipment and reduce equipment costs.

Further, since the AC power supply device does not have the risk of spontaneous discharge such as a storage battery, it is advantageous in terms of maintenance such as charging equipment and periodic replacement, and is also excellent in reliability.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a rope-type elevator, FIG. 2 is a circuit diagram of an embodiment of the elevator emergency rescue operation device according to the present invention, and FIG. 3 is an electromagnetic brake and an electromagnetic brake by the elevator emergency rescue operation device according to the present invention. The figure which shows the state which limits the speed of an elevator. 10... Cart, 12... Counterweight, 2
0... Electromagnetic brake, 30... External power supply device, 4
0... Electromagnetic brake control device, 50... Speed control device.

Claims (1)

[Scope of Claims] 1. An electromagnetic brake that brakes the car by applying a frictional force to the drive machine of the elevator car by power cut, and releases the drive machine of the car by power supply to free the car. An emergency rescue operation device for an elevator that moves the car up and down by controlling the car by alternately repeating power supply and power outage, comprising: an AC power supply having a detachable output terminal; and an AC power supply having a detachable output terminal; an input terminal, an output terminal detachable from the terminal of the electromagnetic coil of the electromagnetic brake, a rectifier for converting the AC power into DC, an operation switch interposed between the input terminal and the rectifier, and a connection between the rectifier and the output terminal. a portable electromagnetic brake control device having a normally open contact interposed therebetween; and provided integrally with the electromagnetic brake control device,
An emergency rescue operation device for an elevator, comprising: a speed limiting device that inputs the normally open contact at predetermined time intervals when the operating switch is turned on.