JPH0144634B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a passenger detection device for automatically operating a passenger conveyor such as an escalator or an electric walkway, and particularly relates to an improvement of a passenger detection device using the Doppler effect.

An automatic operation system for a passenger conveyor using a radio wave switch using the Doppler effect as a passenger detection device will be described with reference to FIGS. 1 to 4.

In Figures 1 and 2, 1 is an escalator;
2 is an escalator step, 3 is a radio wave switch for passenger detection installed on the ceiling 4 of the lower boarding area,
5 is the guide handrail, and the detection area of the radio switch 3 is
It is set to be inside the guide handrail 5 as shown in _A1 . The detection area should be 100% detected inside the guide handrail 5, and no person passing on the stairs 6 should be detected outside the guide handrail 5. 7 is the floor surface.

When a user uses the escalator 1 to reach the detection range of the radio switch 3 at the lower platform, the output relay of the radio switch 3 is activated and gives a driving command to the control device of the escalator 1.

Next, a radio wave switch using the Doppler effect will be explained. 10 is an oscillating unit that oscillates high frequency f _p , 11 is a transmitting unit that sends out f _p , and 12 is a receiving unit that receives reflected waves from the moving object 19, which sends the received frequency f _p ±Δf to mixer unit 13 for oscillation. and the frequency f _p from section 10. 14 is an amplification section, and 15 is a discrimination section for discriminating the Doppler frequency Δf.
16 is a comparison voltage setting section, which is compared with the input signal voltage in the comparison section 17, and if the input signal voltage exceeds the comparison voltage, the switch section 18 drives the output relay.
Since the guide handrail 5 and the floor surface 7 are stationary objects, no Doppler frequency is generated and the output relay of the radio wave switch is not driven. When the moving object 19 moves within the detection range, a Doppler frequency Δf is generated and the output relay of the radio wave switch is driven.

Next, an automatic operation circuit for an escalator using a radio wave switch as a passenger detection device will be explained with reference to FIG.

In Figure 4, R and S are AC control power supplies, 43S
is an operation mode selection switch, and when automatic operation is selected, automatic operation relay 43A is energized. Reference numeral 70 denotes a radio wave switch which detects the escalator user when the user reaches the passenger detection device section at the lower platform and activates the output relay. Reference numeral 48 is a timer for controlling automatic operation time, which starts counting when the user passes the radio wave switch 70, and gives a stop command to the escalator when a certain time limit is reached. 11A is a relay for ascending operation command, 12A is a relay for descending operation command, 11B is an ascending operation contactor, and 12B is a descending operation contactor. UP is a start switch for raising manual operation, DN is a start switch for lowering manual operation,
STOP is a stop switch. 60A is an automatic operation command relay that is energized by the output contact ₇₀₁ of the radio wave switch 70 and gives an automatic operation command to the upward operation command relay 11A, and 60B is an automatic operation timer 4.
This is a timer control relay that controls 8.

When the escalator user reaches the passenger detection device at the lower platform, the radio switch 70 is activated and the automatic operation command relay 60A is energized by R-70 ₁ -11B ₂ -60-S. ―
STOP-43A ₃ -60A ₁ -12A ₂ -11A-S
The upward operation command relay 11A is energized by
R-STOP-48 ₁ -11A ₁ -12A ₂ -11A-
It is self-held until ₄₈₁ is opened at S. R-
The upward operation contactor 11B is energized by 11A ₃ -12B ₁ -11B-S, and the escalator starts upward operation. When the radio switch 70 operates, R
-70 ₁ -60B-S energizes the timer control relay 60B, and its normally open contact _60B2 closes the reset circuit of the automatic operation timer 48, resetting the timer. When the user passes the passenger detection device section, the radio switch 70 becomes inoperable and its output contact ₇₀₁ is opened, and the timer control relay 60B is deenergized, so its normally closed contact 60
_B1 is closed and the timer starts counting. In other words, the automatic operation timer 48 is reset every time the user passes the radio switch 70 and starts counting from that point, so it will not stop before the user reaches the other end of the escalator. . When a certain period of time passes after the user passes the radio switch 70, the automatic operation timer 48 times up, its normally closed contact ₄₈₁ opens, the upward operation command relay 11A deenergizes, and its normally open contact _11A3 closes. The escalator will automatically stop as the circuit is opened. Although the above description has been made regarding automatic operation only for ascending, automatic operation for descending can also be configured to operate in the same manner.

The radio switch is attached to the ceiling 4 as shown in Figure 1 and transmits high-frequency radio waves toward the floor 7, so the radio waves that hit the floor 7 are diffusely reflected, and some of them hit the ceiling 4 as shown in B. I'm reaching the escalator steps. Especially when the ceiling 4 is made of a conductive material such as a steel plate, strong radio waves reach the escalator steps 2. When the escalator is stopped, even if the radio waves reach escalator step 2, since it is a stationary object, no Doppler frequency is generated and the radio switch does not operate. When the user reaches within the detection range _A1 of the radio switch 3, the radio switch 3
is activated, and the escalator starts automatic operation as described above due to its output relay. When escalator 1 starts, the radio wave B that has reached the steps of escalator 2 generates a Doppler frequency, and the input signal voltage of radio wave switch 3 increases.

While the input signal voltage from escalator step 2 is being generated, if the following user reaches the detection range of the 3 radio wave switch, the input signal voltage generated by the user and the input signal voltage generated by escalator operation will be are superimposed, and the detection area becomes _A2 . FIG. 5 shows the operating characteristics of the radio wave switch 3.

C is the operating characteristic when the escalator is in a stopped state, and the detection area is A ₁ when the input signal voltage is V ₁ .

D is the operating characteristic when the escalator is in operation, and when the input signal voltage is _V1 , the detection area is _A2 . The escalator is in operation and the detection area is
When enlarged to A ₂ , the stairs 6 outside the guide rail 5
The escalator continues to operate for an unnecessary period of time because the radio switch 3 is activated by a person passing the stairs. There is a drawback that it does not stop. If the comparison voltage is set so that the radio switch 3 does not operate even if the escalator passes outside the guide handrail 5 while the escalator is operating, the detection area when the escalator is stopped becomes smaller and the vehicle passes along the inside of the guide handrail 5. The radio wave switch 3 may not be detected by the user.

Even if a user passes through the third radio switch and is not detected, some users continue to walk and use the escalator as a substitute for stairs. At this time, when the radio switch 3 is activated by the following user, the escalator will start, and the user who was walking instead of the stairs will fall and risk serious consequences, so failure to detect the passenger detection device is unacceptable. It is something. As described above, the radio wave switch has the disadvantage that its operating characteristics change due to diffuse reflection of radio waves.

SUMMARY OF THE INVENTION An object of the present invention is to prevent the above-described drawbacks of the radio wave switch and provide a highly safe passenger detection device for a passenger conveyor.

A feature of the present invention is that the detection area is made constant by changing the setting of the comparison voltage of the radio wave switch when the escalator is stopped and when the escalator is running.

An embodiment of the present invention will be described with reference to FIGS. 5 to 7. In Fig. 6, 16A is a comparison voltage setting part when the escalator is stopped, and _16B is a comparison voltage setting part when the escalator is in operation.
7 is connected to the comparison section. By switching the comparison voltage when the escalator is stopped and when it is running, the detection area of the radio switch can be kept constant.

To explain with reference to FIG. 5, the comparison voltage when the escalator is stopped is _V1 , and its detection area is _A1 according to the operating characteristic C.

Next, when the escalator starts operating, contact 1
_A1 is closed, the comparison voltage becomes _V2 , and the detection area becomes _A1 from the operating characteristic D.

Next, the operation circuit will be explained with reference to FIG.

In the figure, 1A is a comparison voltage switching relay that switches the comparison voltage of the radio switch 70 during escalator operation, and is an instantaneous action time limit return type time relay. When the user reaches the radio switch section of the lower platform and the output relay closes, the ascending operation command relay 11A is energized and its normally open contact 11A ₄
is closed, the comparison voltage switching relay 1A is energized, its normally open contact _1A1 is closed, and the comparison voltage of the radio wave switch 70 is switched from _V1 to _V2 . As a result, as described above, the detection area of the radio wave switch is maintained at the same area as when the escalator is stopped. When the automatic operation timer 48 reaches the setting time, the upward operation command relay 11A is deenergized, so its normally open contact 1
_1A4 is opened, the comparative voltage switching relay 1A is deenergized, and its normally open contact _1A1 is opened after a certain period of time, that is, after the escalator has stopped braking, and the comparative voltage of the radio wave switch 70 becomes _V1 .

As described above, the present invention maintains the detection area of the radio wave switch constant regardless of whether the escalator is stopped or in operation, so it can be a highly reliable and safe passenger detection device for a passenger conveyor. In particular, when an escalator is installed in a space where the installation location is limited, such as in a subway station, the diffuse reflection of radio waves is large and the present invention can provide a reliable passenger detection device.

[Brief explanation of drawings]

Figure 1 is a front view of the self-driving escalator, Figure 2 is its top view, Figure 3 is a control block diagram of the radio switch, Figure 4 is the operating circuit of the self-driving escalator, and Figure 5 is a characteristic diagram of the radio switch. , 6th
The figure is a control block diagram of the radio wave switch of the present invention, and FIG. 7 is an operating circuit diagram of the automatically operating escalator of the present invention. 1...Escalator, 2...Steps, 3...Power switch, 4...Ceiling, 5...Induction handrail, 1A...Comparison voltage switching relay.

Claims (1)

[Claims] 1. Passengers on a passenger conveyor are detected by a radio wave switch using the Doppler effect, characterized in that the comparison voltage of the radio switch is configured to be switched depending on the operating state of the passenger conveyor. Detection device.