JP2567989B2 - Passenger conveyor control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a passenger conveyor control device, and more particularly to a passenger conveyor control device capable of detecting a failure of various safety device input circuits.

[Prior Art] Generally, a passenger conveyor such as an escalator or an electric road is provided with various safety devices such as a skirt guard switch and a chain safety switch. As a conventional technique relating to these safety devices, for example, a technique described in Japanese Patent Laid-Open No. 55-11402, "Passenger Conveyor Safety Device" is known.

This prior art relates to a method for detecting whether or not a safety device is activated. Signals from various safety devices are input in parallel to a microcomputer, which is one of the digital electronic computers, so that the safety device can operate simultaneously. Prevents unnecessary stoppage of the passenger conveyor by distinguishing the operation and detecting the operation of the safety device, and by not recognizing that the safety device has operated when it momentarily operates due to mechanical vibration etc. Is to do.

[Problems to be Solved by the Invention] The prior art does not consider the failure detection method of the microcomputer input circuit of the safety device. If the microcomputer input circuit fails during the operation of the passenger conveyor, the safety device is activated. It has the problem that it cannot be detected and is extremely dangerous.

Further, in the above-mentioned conventional technology, in order to avoid the above-mentioned problems, it is necessary to detect a failure of the microcomputer input circuit of the safety device. Therefore, if the passenger conveyor is stopped for this reason, This causes a problem that serviceability is significantly deteriorated.

An object of the present invention is to solve the above problems of the prior art, and to provide a passenger conveyor control device capable of performing a failure diagnosis of a microcomputer input circuit of various safety devices without interrupting the operation of the passenger conveyor. It is in.

[Means for Solving the Problems] According to the present invention, the object is to provide a microcomputer input signal when a failure diagnosis relay contact or the like is provided in series between various safety devices and a microcomputer input circuit, and the contact is controlled to be opened or closed. This is accomplished by diagnosing the microcomputer input circuit by checking.

[Operation] The failure diagnosis relay is controlled by a microcomputer,
It operates so as to open or close between the safety device and the microcomputer input circuit. The contact of the failure diagnosis relay is normally closed, and when the safety device operates and closes in this state, the microcomputer input signal changes and the operation of the safety device can be detected.

On the other hand, during the operation of the passenger conveyor, in order to check the failure of the microcomputer input circuit, the microcomputer drives the failure diagnosis relay and opens its contact. At this time, if the microcomputer input circuit is normal, the microcomputer input signal changes in synchronization with this, and if the microcomputer input circuit is abnormal, the microcomputer input signal does not change. This allows the microcomputer to check the normality of the input circuit.

According to the present invention, it is possible to judge that the microcomputer input circuit is abnormal as described above, and thereafter, it is possible to shift to a sequence operation for ensuring appropriate safety. According to the present invention, therefore, it is possible to perform a failure diagnosis of the microcomputer input circuit without stopping the operation of the passenger conveyor, so that it is possible to realize a highly safe system without lowering serviceability.

[Embodiment] An embodiment of a passenger conveyor control device according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention,
FIG. 2 is a side view of the entire escalator when one embodiment of the present invention is applied to an escalator, and FIG. 3 is a flow chart for explaining the operation of one embodiment of the present invention. First
2 and 1, 1 is an escalator frame, 2
Is a machine room, 3 is a step, 5 is a handrail, 73 is a level conversion circuit, 81 is a microcomputer, 105 is a telephone interface, 107 is a public line, 109 is a central monitoring center, and 203 is an output device.

As shown in FIG. 2, an escalator to which the present invention is applied has a drive sprocket, which is supported by an escalator frame 1 and is not shown in machine rooms 2 above and below the escalator frame 1.
It is provided with a driven sprocket, a step chain is continuously wound around this sprocket, and a large number of steps 3 are integrally mounted in a row on the step chain.

The entire steps are moved up and down by a drive machine (not shown) driving the drive sprocket. The handrail 5 driven at the same speed as in step 3 runs on the balustrade provided on both sides of step 3.

The various safety devices for the escalator are described in detail in Japanese Patent Laid-Open No. 55-11402, and the description thereof will be omitted here. In addition,
In addition to this, a start switch board having an emergency stop switch for driving, stopping, or emergency stopping the escalator is provided in the terminal portion of the escalator.

FIG. 1 is a block diagram mainly showing the function of the logic control unit of the control device for an escalator according to the present invention, which will be described below.

The control device comprises a microcomputer 81, which is a digital electronic computer, as the center of the control device.

The microcomputer 81 drives the escalator via the output device 203, which is the output storage means, and the means 103 for driving the drive machine. The drive means 103 is composed of electromagnetic switches 55 and 57 for switching up and down, and the drive machine of the escalator is driven by turning on any one of these electromagnetic switches.

Further, the microcomputer 81 detects the operation of the safety device based on the input signal of the safety device, and performs a process of outputting the operation permission signal 224 from the output PB6 as the operation detection result. In addition, the microcomputer 81 determines the operating status of the safety device of the escalator, and reports the result to the centralized monitoring center 109 in charge of maintenance via the telephone interface 105 and the public line 107 (outgoing call notification). Perform processing.

Among the input signals to the microcomputer 81, as the control signal for controlling the escalator, there are the above-mentioned start command switch inside the start switch board, the down command switch, etc.
In FIG. 1, only the start switch 44 is shown as a representative of these. That is, the following description will be made assuming that the start switch 44 is closed when the ascending command switch and the descending command switch are operated. Note that the relay 207 is a safety relay, and when this relay is released, the escalator will make an emergency stop.

The safety device includes a manual reset type safety switch and an automatic reset type safety switch. Normally, a plurality of these are provided, but in FIG. 1, the safety device signal output as the operating condition is manually output. The reset type safety switch is represented by the switch 46, and the automatic reset type safety switch is represented by the switch 47.

The above-mentioned switch for control signal, which is a typical start switch 44, is connected between the power source P and the level conversion circuit 73, and the safety switches 46, 47 for safety device signals are connected to the power source P. It is connected between the contact 50ch of the fault diagnostic relay 50CH and the level conversion circuit 73.

The level conversion 73 performs voltage conversion from an external voltage, in this example, the voltage of the power source P to a voltage for a microcomputer, generally, for example, 5V. Then, the level conversion circuit 73
The control signal and the safety device signal that have passed through are input to the inputs PA0 to PAn of the microcomputer 81.

The outputs of the microcomputer 81 are outputs BP0, 1, 5 for driving the escalator. These outputs are input to the inputs D1, D2, and CK of the output storage device 203 of the next stage, and drive the output storage device 203.

The output PB0 is a terminal that outputs a signal for raising the escalator. When the output PB5 is changed after this signal is output, the output signal is stored in the output storage device 203. With this signal, the output 01 of the output device 203 operates, and if the stop switch 43 and the emergency stop button 45 in the start switch board of the escalator are closed at this point, the ascending electromagnetic switch 55 is turned on. It This operation causes the escalator to start ascending operation.

Similarly, when performing the descending operation, output PB1
When B5 is changed, the lowering electronic switch 57 is turned on, and the escalator starts the lowering operation. To stop the escalator, operate the stop switch 43 to turn on the power supply ACA.
Is switched off, the electromagnetic switches 55, 57 and the safety relay 20
7 is released, which stops the escalator.

The microcomputer 81 sends this stop command to the safety relay 207.
After knowing from the operation of the contact of, the output of the output PB0 or PB1 is returned to the stopped state, the output PB5 is changed, and the memory in the output storage device 203 is erased.

The microcomputer 81 processes the main operation described above, and when the escalator is operating, performs the operation detection process based on the signal input from the safety device.

That is, when the microcomputer 81 determines that the operation status of the safety device is normal as a result of performing the operation detection,
The operation permission signal 224 is output from the output PB6 as an active signal "1". When this operation permission signal 224 is input to the E terminal of the output storage device 203, the output storage device 203 causes the microcomputer 8
It is possible to store the rising and falling commands output from 1.

The microcomputer 81 does not depend on this signal
It is possible to program PB0, 1, 5 to stop the escalator directly.

The normality of the input circuit of the microcomputer according to the present invention is checked as follows.

During operation of the escalator, the microcomputer 81 causes the output storage device 203 to release the normally-on failure diagnosis relay 50CH and open its contact point 50ch. Since the safety switches 46 and 47 are closed in a non-operating state, when the contact 50ch is opened, if the inputs PAo to PAn of the level conversion circuit 73 and the microcomputer 81 are normal, the microcomputer 81
Detects that these input signals change from "1" to "0".

On the other hand, if the circuit is faulty during the operation of the escalator, even if the contact 50ch of the fault diagnostic relay 50CH is opened,
The input signal remains "1", whereby the microcomputer 81 can detect the failure of the safety switch and start the sequence operation for ensuring appropriate safety such as releasing the safety relay 207. it can.

In the case of a failure where the input signal is "0", it is equivalent to the safety switch operation, so the escalator is stopped and it is in the fail-safe direction, so it is necessary to detect the failure where the input signal is "0". There is no.

Next, the concept of these fault detection software is explained in the third section.
This will be described with reference to the flowchart shown in the figure.

This flowchart is a flowchart showing a sequence process started by the timer interrupt 2-501 and the timer interrupt 1-521 which is generated in the microcomputer 81 at regular intervals. Timer interrupt 2 is a sequence process related to operation control,
The timer interrupt 1 is a failure diagnosis sequence process of the microcomputer input circuit, and the last terminal 551 (return) ends the interrupt process and returns to the normal loop.

First, the sequence processing related to operation control activated by the timer interrupt 2 will be described.

(1) When the timer interrupt 2 is activated, the activation switch 44,
The signals of the safety switches 46, 47 and the like are taken in from the inputs PA0 to PAn via the level conversion circuit 73 to detect whether or not the safety device is operating (steps 502, 503).

(2) In step 503, when the operation of the safety device is detected, the operation permission signal 224 is set to “0”, the output signal for turning on the electromagnetic switches 55 and 57 for raising and lowering is set to “0”, and the escalator is set. And the warning flag for reporting the safety device operation to the centralized monitoring center is set to "1" and the processing is terminated. (Steps 505, 509, 511).

(3) In step 503, when the operation of the safety device is not detected, the operation permission signal 224 is set to "1" and the safety relay 207
(Steps 504 and 506).

(4) When the safety relay 207 is in the released state, the steps 509 and 511 described above are executed. When the safety relay 207 is in the closed state, the start switch 44 is opened to determine whether the escalator is in operation. If the escalator is in operation and the start switch 44 is open, the process is terminated (steps 507 and 50).
8).

(5) The escalator is stopped and the start switch 44
If is closed, the output signal for turning on the electromagnetic switch 55 or 57 is set to "1" and the process is terminated (step 51).
0).

Next, the failure diagnosis sequence processing of the microcomputer input circuit activated by the timer interrupt 1 will be described.

(1) When the timer interrupt 1 is started, it is detected whether or not the safety device is operating, and when the operation of the safety device is detected,
The same processing as the steps 505, 509, and 511 is executed to stop the escalator, set the alarm flag to "1", and finish the processing (steps 522, 529 to 531).

(2) In step 522, when the operation of the safety device is not detected, the operation permission signal 224 is set to “1”, the output signal for turning on the relay 50CH is set to “0”, the relay 50CH is released, and its contact point is set. Open the channel 50 and take in signals from the safety switches 46, 47 etc. from the input PA0-PAn (steps 523-52).
Five).

(3) Check the status of the signals fetched from inputs PA0 to PAn,
In the case of "1", that is, when the signal state of the safety switch does not change even though the contact 50ch is opened, it is assumed that the microcomputer input circuit including the level conversion circuit 73 has a failure, and the step described above is performed. The processing of 529 to 531 is executed and the processing ends. In this case, the notification by the flag in step 531 is a process for notifying the failure of the microcomputer input circuit (step 526).

(4) If the signal fetched from inputs PA0 to PAn is "0", the microcomputer input circuit is judged to be normal,
The output signal that turns on the relay 50CH is set to "1" and the electromagnetic switch
The process ends by setting the output signal for turning on 55 or 57 to "1" (steps 527 and 528).

In the processing of steps 511 and 531 described above, the notification flag is "1".
Then, the telephone interface 105 is controlled,
The centralized monitoring center 109 is informed of the operation of the safety device and the abnormality of the microcomputer input circuit. Based on this notification, the maintenance personnel rushes from the central monitoring center 109 to inspect the escalator, then restores the safety device, inspects and repairs the abnormal portion, and returns the escalator to the operating state.

According to the above-described embodiment of the present invention, it is possible to detect a failure in the microcomputer input circuit while the escalator is operating.

FIG. 4 is a block diagram showing the configuration of another embodiment of the present invention. In FIG. 4, 75 is a level conversion circuit, 82 is a microcomputer, 50CHA and 50CHB are failure diagnosis relays, and other reference numerals are the same as those in FIG.

The other embodiment of the present invention shown in FIG. 4 is different from the embodiment described with reference to FIG. 1 in that a second microcomputer 82 and a level converter 75 are provided, and the input of the safety switch has a dual system configuration. Is.

Shown in another embodiment of the present invention is a microcomputer 81 and a microcomputer.
The operation permission signal 224 can be set from any of the 82 to control the operation stop of the escalator.

In another embodiment of the present invention having such a dual system structure, the microcomputer 81 or the microcomputer 81 is opened by opening and closing the failure diagnosis relays 50CHA and 50CHB separately.
You can check 82 input circuits one by one,
Even if the safety device is activated during the failure diagnosis, the microcomputer on the side that has not performed the failure diagnosis can control the operation stop and the like, so that the safety can be significantly improved.

Although the above-described embodiments of the present invention have been described as being applied to an escalator, the present invention can be applied to passenger conveyors in general such as an electric road.

Further, in the above-described embodiment of the present invention, the contact of the safety switch and the relay for failure diagnosis is a mechanical contact, and the contact of the relay for failure diagnosis interrupts the input of the safety switch. , These contacts may be of electronic type, or may be composed of a logic circuit. When configured by a logic circuit, the logic circuit that replaces the failure diagnosis relay may be configured to have a function of converting a signal from the safety switch into a signal indicating the operating state of the safety switch.

That is, the means for interrupting the input signal to the digital computer of the safety device is configured by a logic circuit that converts the signal from the safety device into a signal indicating the operating state of the safety device and outputs the signal, instead of interrupting the input signal. The digital computer may detect a signal indicating the operating state of the safety device converted and output by the logic circuit, and in this case, the logic circuit outputs a signal indicating the operating state of the safety device. If the safety device is activated, the safety device may not be detected.

[Effects of the Invention] As described above, according to the present invention, it is possible to detect a failure of an input circuit of various safety devices of a passenger conveyor without stopping the passenger conveyor, and to operate the passenger conveyor when the safety device is activated. The passengers can be surely stopped to ensure the safety of passengers.

Further, according to the present invention, when the failure of the microcomputer input circuit is detected, the centralized monitoring center can be notified, so that the failure of the microcomputer can be reliably maintained.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a side view of the entire escalator when the embodiment of the present invention is applied to an escalator, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a flow chart for explaining the operation of FIG. 4, and FIG. 4 is a block diagram showing the configuration of another embodiment of the present invention. 1 ... Escalator frame, 2 ... Machine room, 3 ...
Step: 5 ... Handrail, 73 ... Level conversion circuit, 81 ... Microcomputer, 105 ... Telephone interface, 107 ... Public line, 109 ... Centralized monitoring center, 203 ...
… Output device.

Claims (9)

(57) [Claims] 1. A safety device comprising an endless strip, a drive machine for the endless strip, and a digital computer for control, wherein a signal from a safety device for a passenger conveyor is input to the digital computer to enable the safety device to operate. In the passenger conveyor for detecting operation, the safety computer is provided with means for cutting off an input signal to the digital computer, and the digital computer is
A passenger conveyor control device characterized by detecting an input signal from the safety device to a digital electronic computer in conjunction with this shut-off operation, thereby checking the normality of an input circuit of the digital electronic device. 2. The control device for a passenger conveyor according to claim 1, wherein the operation of the safety device is not detected when the input of the safety device to the digital computer is cut off. 3. The safety device according to claim 1, wherein one means for interrupting an input to the digital computer of the safety device is provided commonly to a plurality of safety devices.
The control device for the passenger conveyor according to the item. 4. A means for interrupting an input signal to the digital computer of the safety device, instead of interrupting an input signal,
It is configured by a logic circuit that converts a signal from the safety device into a signal indicating the operating state of the safety device and outputs the signal, and the digital computer detects the signal indicating the operating state of the safety device converted and output by the logic circuit. Claim 1 characterized by the above-mentioned.
Control device for the passenger conveyor described. 5. The control of the passenger conveyor according to claim 4, wherein when the logic circuit outputs a signal indicating the operating state of the safety device, the safety device does not detect the operation of the safety device. apparatus. 6. The passenger conveyor control device according to claim 1, wherein a plurality of the digital computers are provided. 7. The passenger conveyor control device according to claim 6, wherein the plurality of digital computers do not check the normality at the same time. 8. A passenger conveyor is stopped by means for driving the drive machine when a failure of an input circuit of a digital electronic computer is detected. The passenger conveyor control device according to claim 1. 9. A means for alerting the centralized monitoring center of information on the operation of the passenger conveyor and failure, etc., and when the failure of the input circuit of the digital computer is detected, the failure is reported to the centralized monitoring center. The passenger conveyor control device according to any one of claims 1 to 8 characterized by the above.