JPS63160990A - Passenger conveyor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a passenger conveyor, and particularly to a passenger conveyor that ensures safety in the event of brake failure.

<Prior Art> Passenger conveyors are equipped with brakes to prevent the steps from moving when the conveyor is not in operation. This type of brake has been proposed, for example, in Japanese Patent Laid-Open No. 49-64182.

Since the passenger conveyor is equipped with this type of brake, when the passenger conveyor is not in operation, a braking force is applied to the passenger conveyor to stop the step transfer. At the same time, the brake is provided with a mechanism for holding the step in a stopped position in order to prevent the step from moving downward due to a heavy object on the step.

For example, when a passenger uses a suspended passenger conveyor in a stairway, the steps receive a large force in the downward direction.
If the brakes mentioned above are not equipped,
The passenger conveyor moves on its own, creating a dangerous situation.

As described above, the brake is an extremely important safety device among the components of passenger and passenger conveyors, so it is constructed with a highly reliable system that has few failures.

However, if a brake failure occurs, it will no longer be possible to apply braking force to the steps, so if the motor drive is cut off when the passenger conveyor is stopped, the steps will continue to move due to inertia, reducing the running resistance of each part of the passenger conveyor. As a result, the speed gradually decreases and it stops. Since the brake is malfunctioning in the stopped state, the step is not held at the stopped position.

<Problems to be Solved by the Invention> As mentioned above, in conventionally proposed passenger conveyors equipped with brakes, if the brake fails, the steps are held at the stopped position by the running resistance of various parts of the passenger conveyor. Therefore, if weight is added to the step, there is a risk that the step will start moving downward. This self-propulsion is likely to occur when passengers walk on a suspended passenger conveyor in a stairway, increasing the transfer speed of the steps beyond the rated speed, which may pose a danger to the passengers. .

The present invention has been made in view of the current state of passenger conveyors as described above, and its purpose is to provide a passenger conveyor that detects that the steps have started self-propulsion and controls the transfer of the steps.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention includes a driving electric motor, steps that are arranged in an endless manner and can be moved, and driving the electric motor by a driving command signal. In a passenger conveyor equipped with a first control device that causes the step to be transferred, in a state where the operation command signal is not issued,
The step has a self-propelling detection means for detecting self-propelling of the step, and a second control device that drives the electric motor to move the step in a downward direction when the self-propelling detecting means detects the self-propelling. It is said to be composed of

In the present invention, when the step starts self-propelling even though no driving command has been issued due to a brake malfunction, the self-propelling detecting means detects this self-propelling, and the second control device detects the self-propelling. The step is operated in the downward direction at the rated speed.

This prevents the self-propelled step transfer speed from increasing beyond the rated speed and posing a danger to passengers.

<Example> Hereinafter, an example of the present invention will be described in detail using FIGS. 1 and 2.

Here, FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention,
FIG. 2 is a circuit diagram showing the configuration of the free-running detection means in the embodiment of the present invention.

As shown in FIG. 1, an AC power source 1 is supplied to a first control device 2, and an input terminal of an induction motor 3 is connected to an output terminal of the first control device 2.

A speed reducer 5 is connected to the rotating shaft 4 of the induction motor 3, and a chain 7 is attached to the output rotating shaft 6 of the induction motor 3. A gear 8 is driven by the chain 7. is configured to be transferred.

On the other hand, a brake 10 is attached to the rotating shaft 4 of the induction motor 3 to brake its rotation, and a speed generator 11 is further attached to the rotating shaft 4 to detect the free running speed of step 9. The output terminal of this speed generator 11 is connected to the input terminal of the self-propelled detection means 12.
The output terminal of the driving command signal generator 13 is also connected to the input terminal 2.

An output terminal of the self-propelling detection means 12 is connected to a control terminal of a second control device 14. This second control device 14 is connected in parallel to the first control device 2 between the AC power source 1 and the induction motor 3.

FIG. 2 shows the configuration of the self-running detection means 12 of the embodiment of the present invention having the configuration described above. It is connected to the non-inverting input terminal of amplifier 16.

The inverting input terminal of the operational amplifier 16 is grounded, and the resistor 17 is connected between the non-inverting input terminal and the output terminal of the operational amplifier 16.

A resistor 19 is connected between the output terminal of the operational amplifier 16 and the base of the transistor 18, and the emitter of the transistor 18 is grounded. Further, a free-running detection relay 20 is connected between the collector of the transistor 18 and the bias voltage terminal, and a free-running detection relay 20 is connected between the collector of the transistor 18 and the ground.
Reset switch 21 and contact 2 of self-running detection relay 20
0a are connected in series.

Further, a portion 22 surrounded by a dashed line in FIG. 2 constitutes a comparator, and is set so that the resistance value ratio of the resistor 17 to the resistor 15 is large.

The operation of the embodiment of the present invention having such a configuration will be described.

When a driving command signal is issued from the driving command signal generator 13, the contact 13a is opened by this driving command signal, so the output signal of the speed generator 11 is not input to the self-running detection means 12, and the transistor 18 is cut off. state. Although the reset switch 21 is normally turned on, the self-running detection relay 20 maintains a non-excited state.

In this case, the first control device 2 is activated to drive the induction motor 3, the rotation of the rotary shaft 4 is reduced by the reducer 5 and taken out from the output rotary shaft 6, and the chain 7 is connected to the gear 8.
is driven, and step 9 is operated at the rated speed by driving this gear 8.

When no driving command signal is issued from the driving command signal generator 13, the contact 13a is closed, so that the output signal of the speed generator 11 can be input to the free-running detection means 12. There is.

In this case, when the step 9 enters the free running state, the speed generator 11 generates an output signal with a voltage corresponding to the free running speed, which is input to the non-inverting input terminal of the operational amplifier 16 via the resistor 15. Ru. When this input exceeds a predetermined value, an output signal is generated at the output terminal of the operational amplifier 16 and is input to the base of the transistor 18 via the resistor 19.

For this reason, the transistor 18 becomes conductive, and the free-running detection relay 20 becomes excited. Self-propelled detection relay 20
When energized, the contact 20a closes and the self-running detection relay 20 is self-held.

Since the output signal generated by the excitation of the self-running detection relay 20 is input to the control terminal of the second control device 14, the downward operation relay 25 of the second control device 14 is energized. By energizing the descending operation relay 25, the step 9 performs the descending transfer operation at the rated speed, thereby preventing the transfer speed of the step from increasing beyond the rated speed due to self-propulsion and posing a danger to the passengers. Ru.

Although not shown, when the self-propelled detection relay 20 is energized and the passenger conveyor starts operating by the second control device, an alarm is activated and a notification is sent to the customers and the manager. It is desirable to

In this way, if the brake of the passenger conveyor that is not in operation is out of order and the passenger conveyor starts self-propelling due to an external force, the second control device immediately starts the descending operation, increasing the self-propelling speed. and pose no danger to customers.

In the embodiment, a case in which a second control device is separately provided has been described, but it is also possible to realize a configuration in which a descending operation device of a passenger conveyor is used as the second control device.

<Effects of the Invention> As explained in detail above, according to the present invention, self-running during suspension of operation due to brake failure is detected and operation is performed to reduce the rated speed, thereby preventing an increase in self-running speed and utilizing the system. It is possible to provide a passenger conveyor that prevents danger to customers.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the structure of an embodiment of the present invention, and FIG. 2 is a circuit diagram showing the structure of a free-running detection means in the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... AC power supply, 2... First control device, 3... Induction motor, 4... Rotating shaft, 5...・Reduction gear, 6... Output rotating shaft, 7... Chain, 8... Gear, 9...
...Step, 10...Brake, 11
... speed generator, 12 ... self-running detection means, 13 ... operation command signal generator, 14 ...
. . . second control device, 16 . . . operational amplifier:
18...Transistor, 2-0...Self-running detection relay, 22...Comparator.

Claims (1)

[Claims] In the passenger conveyor, the passenger conveyor includes a driving electric motor, steps that are arranged in an endless manner and can be transferred, and a first control device that drives the electric motor in accordance with an operation command signal to cause the steps to be transferred. a self-propelling detection means for detecting self-propelling of the step in a state where no signal is issued; and when the self-propelling detecting means detects the self-propelling, driving the electric motor to move the step in a downward direction; A passenger conveyor characterized in that it has a second control device.