JP2000143115A - Rescue operation device for elevator failure - Google Patents

Abstract

(57) [Summary] [Problem] To easily and safely perform rescue operation when an elevator fails. When a brake release switch is closed, a brake is released by an output of a battery power supply incorporated in a control device of the elevator. As a result, the elevator starts moving due to the weight difference with the counterweight 2 and descends. The speed of the elevator at this time is uniquely determined by the weight difference between the car 1 and the counterweight 2, the load of the car 1, and the capacity of the resistor 17 due to the dynamic braking of the permanent magnet synchronous motor using the short circuit. Therefore, abnormal acceleration of the car 1 can be prevented. By such an operation, the car 1 arrives at the floor 12, and the cam 11 and the limit switch 13 are engaged to open the normally closed contact 13a, so that the excitation to the brake 15 is cut off and the brake 15 operates. This stops the movement of the car.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator rescue operation device, and more particularly to a passenger rescue operation device for an elevator using a permanent magnet type synchronous motor when an elevator failure occurs.

[0002]

2. Description of the Related Art Conventionally, in an elevator driving system using an induction motor and a worm gear, the transmission efficiency of the worm gear is poor, so that the mechanical brake is released if the car side of the elevator and the counterweight side are not displaced by a considerable amount. Even the elevator car does not move. Therefore, in the elevator according to this method, when the elevator breaks down and the passenger is trapped in the car, the car does not move even if the mechanical brake is released, and the car is moved to the nearest floor to rescue the passenger. There is a problem that may not be possible. On the other hand, in the elevator using the winding drum system, when the mechanical brake is released, the elevator car can always move in the downward direction.
Further, in an elevator using a helical gear and a gearless system, when the mechanical brake is released, the elevator can be moved to a side where the weight of the elevator is heavy due to a slight weight difference between the car side and the counterweight side of the elevator. However, in this helical gear and gearless system, the load on the car side must be held directly by the brake, so the holding force required for the brake is larger than that of the worm gear system, and the entire brake mechanism becomes larger. Weight also increases. Therefore, if the elevator is broken and the brake is released and the elevator is operated, if the elevator speed and landing are controlled by turning on and off the brake, reliable control cannot be performed. Further, for example, as disclosed in Japanese Patent Application Laid-Open No. 59-17477, the operation of the conventional rescue operation of passengers in the car in the event of an elevator failure due to the intermittent on / off operation of the brake causes large vibrations, There is a problem of giving anxiety.

[0003]

SUMMARY OF THE INVENTION The present invention is to solve such a conventional problem, and can easily and safely rescue passengers in a car when an elevator breaks down. An object of the present invention is to provide a rescue operation device at the time of failure of an elevator.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a permanent magnet for controlling the free-run speed of an elevator to be equal to or lower than the rated speed of the elevator so as to smoothly land on the nearest floor. Electrically or mechanically releases a short circuit that short-circuits the three-phase output of the synchronous motor or short-circuits via impedance, a landing detection device that detects the landing of an elevator car, and a brake that keeps the elevator system stationary. Means.

[0005] With such an elevator failure rescue operation device, it is possible to easily and safely rescue passengers in a car when an elevator fails.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1, FIG. 2 and FIG. 3 are circuit diagrams showing an embodiment of an elevator rescue operation device according to the present invention. FIG. 1 shows an elevator using a helical gear or gearless system. When releasing the brake,
FIG. 3 shows a case where the brake is electrically released by an elevator using a winding drum system, and FIG. 3 shows a case where the brake is mechanically released by an elevator using a helical gear or a gearless system. 1, 2 and 3, 1 is an elevator car, 2 is a counterweight for reducing the load on the hoisting machine, etc., 3 is a sheave 4, a deflector wheel 5, and a rope wound around the winding drum 6. In the helical gear or gearless system as shown in FIG. 1 or FIG. 3, an elevator car 1 is connected to one end and a counterweight 2 is connected to the other end.
In the figure, one end of the rope 3 wound around the winding drum 6 is connected to the elevator car 1. 7 is a permanent magnet type synchronous motor for driving the sheave 4 or the winding drum 6, 8 is a motor drive device for driving the permanent magnet type synchronous motor, 9 is a control device of the elevator, and a part or all of it is a hoistway. It is installed in. 10 is a relay for detecting a failure of the motor drive device,
10a, 10b, 10c are normally closed contacts of the relay 9, 10
d and 10e are normally open contacts of the relay 10, and 11 is a cam fixed to the car 1. When the car 1 touches the floor 12, it engages with the limit switch 13 to open the normally closed contact 13a. .

Reference numeral 14 denotes a release switch for the brake 15, and 16
Is a battery power supply for releasing the brake. When the brake is released, the three-phase output of the permanent magnet type synchronous motor is short-circuited via the impedance in FIG. 1 and FIG. 3, in this case via the resistor 17, and is directly short-circuited in FIG. . In FIG. 3, 1
Reference numeral 8 denotes a mechanical brake release lever, and a buzzer 20.
When the car 1 arrives on the floor 12, it engages with the limit switch 13 and stops sounding when the normally closed contact 13a is opened. Brake release switch 14, brake release lever 1
8 are operated from the elevator platform 19.

FIG. 4 is a flowchart showing the operation procedure of the present invention. The operation of the embodiment shown in FIGS. 1, 2 and 3 will be described using the flowchart shown in FIG.

In the elevator apparatus constructed as shown in FIGS. 1 and 3, if there is a slight difference in weight between the car 1 and the counterweight 2, the car 1 can be moved by releasing the brake 15. In the elevator device configured as shown in FIG. 2, the car 1 can always be lowered by releasing the brake 15. That is,
If the elevator system including the driving device 8 breaks down in step S1 while the elevator is running, a safety device (not shown) is activated in step S2, and the elevator is emergency stopped. At this time, in step S3, the control device 9 detects a failure of the elevator, and excites the failure detection relay 10. When the relay 10 is energized, its normally closed contacts 10a, 10b, 10c are opened, and the permanent magnet synchronous motor 7 and the motor drive 8 are cut off. And
The normally open contacts 10d and 10e of the relay 10 are closed and the three-phase output of the permanent magnet synchronous motor 7 forms a short circuit via the resistor 17 in FIGS. 1 and 3, and the three-phase output is directly short-circuited in FIG. You. From this state, in step 4, FIGS.
When the brake release switch 14 is closed, the brake 15 is released by the output of the battery power supply 16 as shown in FIG. Alternatively, in step 5, the brake is released by the brake release lever 18 that mechanically releases the brake as shown in FIG. As a result, in step 6, in the elevator using the helical gear and the gearless system, the elevator starts to move due to the weight difference with the counterweight 2, for example, descends. In an elevator using the winding drum system, it always descends. The speed of the elevator at this time is uniquely determined by the weight difference between the car 1 and the counterweight 2, the load of the car 1, and the capacity of the resistor 17 due to the dynamic braking of the permanent magnet synchronous motor using the short circuit. Therefore, abnormal acceleration of the car 1 can be prevented. By such an operation, in step 7, the car 1 arrives at the floor 12, and the cam 11 and the limit switch 13 are engaged to open the normally closed contact 13a. The movement of the car is stopped by the operation of. In FIG. 3, when the car 1 arrives at the floor 12, the cam 11 and the limit switch 13 are engaged and the normally closed contact 13a is opened, so that the buzzer 20 stops sounding, and the release of the brake 15 is stopped. Movement is stopped. Then, in step 8, the passenger of car 1 is rescued.

As another embodiment, an electric brake 15
The release switch 14 and the brake release lever 18 which is a mechanical brake release means are installed so that they can be operated at any place including the elevator platform 19 so that the maintenance staff of the elevator can work safely. Is done.

[0012]

As described above in detail, according to the present invention, a conventional elevator can be rescued in the event of a failure by using the above-described short circuit, brake release means and dynamic braking of a permanent magnet type synchronous motor. This has the effect of eliminating the speed caused by the intermittent on / off of the brake performed during driving, the large vibration of the car due to the landing control, and the anxiety of the passengers in the car.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of an elevator failure rescue operation device.

FIG. 2 is a circuit diagram showing one embodiment of an elevator failure rescue operation device.

FIG. 3 is a circuit diagram showing an embodiment of an elevator failure rescue operation device.

FIG. 4 is a flowchart showing an operation method of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Elevator car, 2 ... Counterweight, 3 ... Rope, 4 ... Sheave, 5 ... Deflector car, 6 ... Winding cylinder, 7 ... Permanent magnet type synchronous motor, 8 ... Motor drive device, 9 ... Elevator control device, 10 ... Failure detection relay for motor drive,
10a, 10b, 10c: normally closed contacts of a failure detection relay of a motor drive device; 10d, 10e: normally open contacts of a failure detection relay of a motor drive device; 11: cam;
... Limit switch, 13a ... Limit switch normally closed contact, 14 ... Brake release switch, 15 ... Brake, 1
6 ... battery power, 17 ... resistance, 18 ... brake release lever, 19 ... elevator landing, 20 ... buzzer.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tadashi Ariki 1070 Ma, Hitachinaka City, Ibaraki Prefecture Inside the Mito Plant of Hitachi, Ltd. Inside the Mito Plant (72) Inventor Koichi Kuju 1-6-6 Kanda Nishikicho, Chiyoda-ku, Tokyo Inside the Hitachi Building System Co., Ltd. Ritsu System Plaza Katsuta Hitachi Mito Engineering Co., Ltd. F-term (reference) 3F304 AA03 CA05 EC00 EC10

Claims (10)

[Claims] 1. An elevator comprising: an elevator for servicing a plurality of floors; a permanent magnet synchronous motor for driving the elevator via a rope; a brake for holding the elevator system stationary; and a control device for controlling the electric motor. 2. The elevator rescue operation device according to claim 1, wherein when the elevator fails, the brake release means and the three-phase output of the permanent magnet synchronous motor are short-circuited via impedance. 2. An elevator for servicing a plurality of floors, a permanent magnet synchronous motor for driving the elevator via a rope, and a brake for holding the elevator system stationary in the hoistway. When part or all of the control device for controlling the motor is installed in the hoistway, when the elevator fails, the means for releasing the brake and the three-phase output of the permanent magnet synchronous motor are short-circuited via impedance. A rescue operation device at the time of failure of an elevator, characterized in that it is configured as described above. 3. The elevator rescue operation device according to claim 1, wherein said brake release means is provided at a landing of the elevator with a device for mechanically releasing the brake against spring force of a brake. 4. An elevator according to claim 1, wherein said brake release means is configured to release the brake electrically by supplying power from a battery power supply installed in said control device. Rescue driving equipment. 5. The rescue operation device for a failure of an elevator according to claim 1, wherein the impedance is a resistor. 6. The rescue operation at the time of failure of an elevator according to claim 5, wherein the resistance value of the resistor is set so that the free-run speed of the elevator is equal to or lower than the rated speed of the elevator. apparatus. 7. The elevator, wherein a counterweight is arranged in a hanging shape via a rope, and when the elevator fails,
3. The rescue operation in a light load direction of the elevator system by releasing the brake, wherein the rescue operation is performed.
Item 7. The elevator rescue operation device according to Item 5, 5 or 6. 8. The elevator according to claim 1, wherein a rope is disposed via a winding drum, and when the elevator fails, the brake is released to perform a rescue operation in a descending direction.
7. The elevator rescue operation device according to any one of items 2, 3, 4, 5, and 6. 9. The elevator according to claim 1, wherein said elevator is of a gearless type using no gear.
Item 4. The rescue operation device for a failure of an elevator according to any one of Items 4, 4, 5, 6, 7, and 8. 10. The elevator according to claim 1, wherein when the elevator fails, said brake is released to prevent abnormal increase in free-run speed by generating braking of a permanent magnet type synchronous motor using said short circuit. Emergency rescue operation device.