RU2785474C1 - Escalator with electronic drive control system - Google Patents

Abstract

FIELD: controlling equipment.

SUBSTANCE: invention relates to control and management of an escalator. An escalator with an electronic drive control system is proposed, containing a differential capacitive sensor consisting of sequentially connected first and second capacitors and a two-phase AC generator connected to the capacitive sensor. An AC amplifier and an AC-to-DC converter are sequentially connected to the differential capacitive sensor. Metal balustrade sheets isolated from conductive elements of an escalator structure are used as linings of the first capacitor of the differential capacitive sensor.

EFFECT: solution is aimed at protection from vandalism of a drive control system of an escalator.

1 cl, 1 dwg

Description

The invention relates to devices for monitoring and controlling the operation of an escalator drive.

A device for controlling the speed and direction of movement of an escalator is known, including contact and non-contact controls associated with a signal processing unit and operating modes control, characterized in that, as a contact control, it contains an encoder unit kinematically connected to the main shaft of the escalator, which provides: moving the latter into a sequence of electrical signals containing information about the magnitude and direction of movement, and transmitting signals to a signal processing unit and operating modes control; as a non-contact control means, it contains an inductive sensor unit that provides: converting the movement of the traction chain links into a sequence of electrical signals containing information about the magnitude and direction of this movement, and transmitting signals to the signal processing unit and operating modes control; and as a block for processing signals and controlling modes of operation, it contains a central unit that provides: microprocessor processing of incoming signals; control of the executive circuits of the escalator and operating modes of the device; device power supply; information indication [1].

The disadvantage of this device is the lack of protection against vandalism.

Also known is a system for detecting a person with respect to a passenger conveyor, containing a structural component and an area for transporting passengers, containing a capacitive sensor containing a first electrode configured to generate an electric field in the direction of the second electrode in response to the specified oscillatory control signal [2].

The disadvantage of this device is the lack of protection against vandalism.

It is also known a device for controlling the space in front of escalators and moving sidewalks, while before entering the steps of the escalator or on the tape of the moving sidewalk, the drive is switched on, characterized in that at least one sensor is installed in the area of rotation of the handrails, while the sensor is installed with the possibility control the entrance area of an escalator or a moving sidewalk, in particular the entrance plate, while the sensor is sensitive to electromagnetic waves with a wavelength of more than 100 microns outside the optical or infrared range, and is located inside the escalator base [3].

This device was chosen as a prototype of the proposed solution.

The disadvantage of this device is that protection against vandalism is carried out by inconspicuous placement of sensors, which reduces the likelihood of damage, but does not completely eliminate it.

The objective of the invention is to protect the electronic control system of the escalator drive from vandalism by using metal sheets of the balustrade isolated from the conductive elements of the escalator structure as plates of the first capacitor of the differential capacitive sensor.

This is achieved by the fact that the electronic control system for the escalator drive, containing a differential capacitive sensor, consisting of the first and second capacitors connected in series, a two-phase alternator, an alternating current amplifier, an AC-to-DC converter, are used as plates of the first capacitor of the differential capacitive sensor. metal sheets of the balustrade isolated from the conductive structural elements of the escalator.

The use of metal sheets of the balustrade isolated from the conductive elements of the escalator structure as the plates of the first capacitor of the differential capacitive sensor excludes the possibility of damage to the electronic control system of the escalator drive due to vandalism, since the capacitor plates in this case are actually a structural element of the escalator, which in itself performs a vandalism-protective function. On the other hand, the change in the capacitance of the first capacitor of the differential capacitive sensor is directly related to the appearance or departure of a person on the escalator, respectively, the signal generated by the electronic control system of the escalator drive can quickly control the escalator drive to start or stop the movement of the escalator.

In FIG. 1 shows the electronic escalator drive control system, where:

1 - differential capacitive sensor;

2 - the first capacitor of the differential capacitive sensor;

3 - the second capacitor of the differential capacitive sensor;

4 - two-phase alternator;

5 - AC amplifier;

6 - AC to DC converter;

The electronic control system for the escalator drive operates as follows: a two-phase alternator 4 generates rectangular pulses of a fixed pump frequency, which arrive at the inputs of the differential capacitive sensor 1. As a result, from the second output of the first capacitor of the differential capacitive sensor 2 and from the first output of the second capacitor of the differential capacitive sensor 3 an error signal is supplied to the input of the AC amplifier 5, proportional to the change in the capacitance of the first capacitor of the differential capacitive sensor 2. The AC amplifier 5 amplifies the error signal, which is further converted from a DC signal using an AC to DC converter 6. The output signal thus obtained used to control the escalator drive.

For example, consider an electronic escalator drive control system built on the basis of the AD822 operational amplifier chips. A two-phase alternator is implemented according to the scheme of an asymmetric multivibrator, the phase inversion of which is implemented using an inverting amplifier circuit. The pump frequency is 100 kHz. The AC amplifier and AC/DC converter are based on standard op amp circuits. In the case of using a unipolar +5 V power supply, the output signal voltage in the absence of a person on the escalator is +2.5 V, and the change in the output signal voltage when a person appears on the escalator is 1 V. The observed voltage drop makes it possible to unambiguously control the escalator drive in order to start and stop it.

Sources of information:

1. RF patent No. 127052

2. RF patent No. 2533653

3. RF patent No. 2356823 - prototype

Claims (1)

An escalator with an electronic drive control system containing a differential capacitive sensor consisting of first and second capacitors connected in series, a two-phase alternator connected to the capacitive sensor, while an AC amplifier and an AC-to-DC converter are connected in series to the differential capacitive sensor, differing in the fact that metal sheets of the balustrade isolated from the conductive elements of the escalator structure are used as the plates of the first capacitor of the differential capacitive sensor.

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