JPS6344679B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a passenger conveyor device such as an escalator or a motorized road.

Generally, passenger conveyors such as escalators, unlike elevators, are currently operated at all times regardless of the presence or absence of passengers. However, it is extremely uneconomical to keep an escalator in constant operation, whether or not it will be used, and is contrary to power conservation. On the other hand, escalators have been staffed to operate depending on the presence or absence of passengers, but this is not practical as the labor cost is greater than the power saving cost.

Therefore, it is possible to stop the operation of the escalator when there are no customers, detect when a customer approaches the escalator and automatically start operation, or set the operation time. Driving method is being done. However, in the former case, the detection area is widened to detect passengers and automatically operate the escalator, so that passengers do not see the escalator stopped from outside the detection area and do not use the escalator. It is conceivable to notify the driver, but in this case, passersby other than passengers would also be detected, resulting in unnecessary driving. In addition, in the latter case, since the operating hours are fixed, the service to customers outside of operating hours is naturally poor, and the location where the escalator is installed (for example, a station) is specified (e.g., a train station), and escalators cannot be installed in hotels, banks, hospitals, department stores, etc. It can be said that it is impossible to apply it to places where the usage time is unspecified. Also, when there are no customers, there are systems that operate at low speeds (eg 10m/min), and in some cases, operate at constant speeds (eg 30m/min), but this does not result in significant power savings.

The present invention has been made in view of the above points, and its purpose is to provide a passenger conveyor device that can automatically perform economical operation with a simple configuration without reducing service to passengers. There is a particular thing.

In order to achieve the above object, the present invention is configured such that a three-phase induction motor can be selectively operated by a switching means to perform both drive operation by star connection and delta connection. A timer is provided to operate the switching means in response to the above.

The present invention will be explained below based on the drawings of one embodiment.

Reference numeral 1 denotes an escalator tread, which is endless and extends almost the entire length of the escalator. A balustrade 2 having a length approximately corresponding to the entire length of the tread plate 1 is disposed in the side direction of the tread plate 1, and this balustrade 2
A handrail 3 that moves in synchronization with the footboard 1 is supported by the footboard 1 . Reference numeral 4 denotes a drive device for driving the step board 1, which is composed of a three-phase induction motor 5 that is driven at a normal operating speed (for example, 30 m/min) in both non-loaded and loaded conditions, and a speed reducer 6.
drives the footboard 1 via a chain 7.

On the other hand, a lower boarding floor 8A and an upper boarding floor 8B are arranged at the upper and lower parts of the escalator, respectively, and a support frame F including all the above parts is installed in the building floor.
is supported by

FIG. 3 and FIG. 4 are diagrams showing an embodiment of the operating device for the three-phase induction motor 5, and in this figure,
(+) and (-) are power supplies, and _S1 is a switch for selecting whether to run the escalator up or down, and this switch is comprised of an automatic neutral return type switch. 11 is a relay for ascending operation,
12 is a descending operation relay, 11 _a1 , 11 _a2 , 11 _a
3 is a contact of the relay 11, 12 _a1 , 12 _a2 , 12 _a3 is a contact of the relay 12, 13 is a time relay for connection switching, and 13 _a , 13 _b are the contacts. 14 is a relay for delta connection, 15 is a relay for star connection, and 14 _a , 15 _a , 14 _b , and 15 _b are contacts of these relays.

When the power is turned on in the control circuit shown in FIG. 4, the power flows as (+)-13-(-), and the relay 13 is energized. This time relay 13 is configured so that the time is set depending on the degree of congestion, and for example, in a department store, etc., which is crowded from 10:00 to 11:00 when the store opens, and is quiet thereafter, it is energized for one hour after power is turned on. . Due to the excitation of this relay 13, a current flows as (+) -13 _a -15 _b -14-(-),
Excitation of the relay 14 causes the contact _14a to close.
Now, when starting switch S ₁ is turned to the UP side,
The relay 11 is energized and the contact 11 _a1 is closed to form a self-holding circuit, the relay 11 remains energized and the main contact 11 _a2 shown in FIG. 3 is closed. Therefore, at the same time as current flows through the motor 5,
Contact 11 _a3 inserted into the brake B circuit closes, current flows through rectifier C, and brake B
is opened, and the escalator starts operating in delta connection. On the other hand, after a certain period of time has elapsed, the relay 13 is demagnetized, the relay 15 is energized, and the motor 5 is operated in star connection.

In this way, department stores use a delta connection, which has high power loss but is powerful, only when the store is open and crowded.
During other off-season periods, the system operates using a star connection with low power loss.

In addition, switching between delta connection and star connection is as follows:
Since this can be done without changing the rotational speed of the three-phase induction motor 5, the operating speeds of the footboard 1 and handrail 3 do not change either. Therefore, the switching can be performed while passengers are using the escalator, so there is no need to change the escalator after the escalator is stopped or to perform the switching after passengers have disembarked, which would lead to poor service.

Figure 5 is a diagram showing the relationship between output and input power for delta connection and star connection.As is clear from this figure, star connection requires less input power than delta connection up to an output of about 4KW. I understand that. However, when star connection operation is performed to the limit of the output of 4KW, a shock occurs during delta connection, which significantly impairs riding comfort and creates a feeling of anxiety. Therefore, the timing of switching is
For a 5.5KW electric motor, around 3KW is optimal.

The above is an explanation of one embodiment of the present invention, and in this example, the engine is started with delta connection during congestion, but it is also possible to use star connection at startup and switch to delta connection when the rated speed is reached.

According to the present invention, by using a simple star/delta connection switching means and a timer, it is possible to perform delta operation during busy times and star operation during quiet times, and the above operation can be switched during passenger use. The simple configuration enables energy-saving operation of the passenger conveyor without degrading the service to passengers, and since the passenger conveyor is constantly operated, the service to the users is not degraded.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of an escalator to which the present invention is applied, Fig. 2 is a perspective view of the driving device portion, and Fig. 3
The figure is a starting circuit diagram of an electric motor in a passenger conveyor device according to an embodiment of the present invention, FIG. 4 is a circuit diagram for controlling the starting circuit of FIG. 3, and FIG. 5 is a diagram showing the input power and output of a star-delta connection. FIG. 1... Stepboard, 2... Balustrade, 3... Handrail, 5... Three-phase induction motor, 14 _a ... Contact for delta connection, 15 _a ... Contact for star connection.

Claims (1)

[Claims] 1 A stepboard connected in an endless manner, a balustrade arranged along the side traveling direction of the treadboard, a handrail that is supported by the balustrade and moves in synchronization with the treadboard, and the handrail and the treadboard. In a passenger conveyor with a three-phase induction motor driving the
The three-phase induction motor is configured to be capable of selectively operating both a star connection drive and a delta connection drive operation using a switching means, and a timer for operating the switching means in response to a busy time of passengers. A passenger conveyor device characterized by being provided with.