JPH03192091A - Safety device for escalator - Google Patents

Abstract

PURPOSE:To improve the safety by detecting the slip of a handrail and slip by a pair of devices by detecting the revolution speed of a roller which is attached on the reverse surface of the downward curved part on the going passage side of a handrail belt by an urging member and controlling the drive of an escalator according to the output of a revolution detector. CONSTITUTION:When slip is generated on a handrail belt 12 because of the abnormal expansion, etc. due to mischief, and the driving speed of the handrail belt 12 lowers, the voltage outputted from a speed generator 15 lowers, and the voltage becomes a prescribed value or less, a detecting relay A is deenergized, and a contact point A1 is closed. Accordingly, an alarm buzzer BZ operates, and a timer TA starts time counting. When the time limit on the timer TA completes, the contact point TA1 is closed, and a stop relay B is energized, and the contact point B1 is opened, and the operation of an escalator is suspended. When no slip is generated before the time limit on the timer TA completes, the operation of the buzzer BZ is suspended, and the operation of the escalator is continued.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an escalator safety device, and particularly to an escalator safety device for safely controlling the escalator against dislodgement and slippage of handrail belts. It is.

[Prior Art] FIG. 5 is a sectional view of a main part of an escalator showing a conventional escalator safety device disclosed in, for example, Japanese Utility Model Publication No. 51-27591.

In the figure, reference numeral (1) is a guide held by the holding frame (2), and (3) is an annular handrail belt attached to the guide (1) and driven in the left-right direction in the figure.

(4) is rotatable around the shaft (5), and one end is guided (
(1) is an L-shaped actuating arm attached to the actuating arm, (6) is a roller rotatably attached to the actuating arm, and (7) has one end fixed to the holding frame (2) and the other end attached to the actuating arm ( 4) toward the handrail belt (3). Due to the bias of this spring (7), the roller (6) comes into contact with the handrail belt (3), and the handrail belt (3) is driven. It also rotates.

(8) is a detector fixed to the holding frame (2) and has a switch (8a), and the switch (8a) is a normally operating arm (
4) It is pressed against the other end.

The conventional escalator safety device as described above is located inside the downwardly convex curved part of the outbound side of the handrail belt (3), that is, the part A in Fig. 6, and is located inside the double-dashed line in Fig. As shown, when the handrail belt (3) comes off the guide (1), this is detected and the drive of the escalator is controlled. That is, if the handrail belt (3) comes off,
The actuating arm (4) biased by the spring (7) rotates counterclockwise in FIG. 5 about the shaft (5). As a result, the other end of the actuating arm (4) is separated from the switch (8a), and the detector (
8) is activated to stop driving the escalator.

On the other hand, as another conventional escalator safety device, there is a device that detects the slippage of the handrail belt, that is, the state in which the movement of the handrail belt is not properly synchronized with the movement of the steps and is delayed, for example, in Japanese Utility Model Application No. 5816768. Publication No. 58-173668 and Japanese Patent Application Laid-Open No. 61-25448
This is shown in Publication No. 9, etc. Although these items are not shown in the drawings, they all have
A roller that rotates as the handrail belt is driven is brought into contact with the handrail belt, and a rotation detector such as a speed generator is connected to this roller, and the speed of the steps and the handrail belt can be determined from the direction of the rotation detector. The speed of the escalator is compared with the speed of the escalator to control the escalator drive.

[Problems to be Solved by the Invention] In the conventional escalator safety device configured as described above, the former device is attached to the handrail in order to detect the disengagement of the handrail belt (3) from the guide (1). In order to detect belt slippage, each of the latter devices was required separately, so in order to detect both, it was necessary to install both the former and latter devices separately, which resulted in extremely high costs. This may cause frustration and increase the risk of malfunction.
There were problems such as a decrease in the reliability of the entire device.

[Means for Solving the Problems] A safety device for an escalator according to the present invention uses a biasing member to bring a roller into contact with the back surface of a downwardly convex curved portion on the outbound side of a handrail belt, and prevents rotation of the roller. A rotation detector for detecting the speed is provided, and a control means for controlling the drive of the escalator according to the output of the rotation detector is connected to the rotation detector.

[Embodiment] The present invention will be explained below based on the drawings showing one embodiment of the invention.

Fig. 1 is a cross-sectional view of a main part of an escalator with a landing having a safety device according to an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a cross-sectional view of the FIG. 2 is a schematic side view showing the entire escalator with a landing shown in the figure.

In the figure, reference numeral (1) is a steel guide with a U-shaped cross section, and this guide (11) has its upper end bent outward at right angles so that it can be bent along its length. An extending flange portion (lla) is formed. (12) is an annular handrail belt that is slidably attached to the guide (11) and serves as a handrail for passengers;
This handrail belt (12) is constructed by winding U-shaped ears (12a) formed on both sides along its length around a flange (lla).
1). In addition, the handrail belt (12) of the flange part (lla)
A nylon material (llb) is provided at the contact area to ensure smooth sliding.

(13) is a mounting base attached to the bottom of the guide (11) of the curved part near the landing of the downwardly convex curved part on the outgoing side of the handrail belt (12) (Fig. 3B); 1
4) is a leaf spring (15) as a biasing means whose base end is fixed to the mounting base and extends in the length direction of the handrail belt (12);
) is a speed generator as a rotation detector fixed to the tip of the leaf spring (14), and (16) is a roller rotatably attached to the speed generator (15).
6) is the back side (
(12) rotates as the handrail bell (12) is driven.

Further, the output of the speed generator (15) is input to the control means via the wiring (17).

FIGS. 4(a) and 4(b) are circuit diagrams each showing a circuit constituting an example of the control means, and in this embodiment, a circuit similar to that shown in Japanese Patent Laid-Open No. 61-254489 is used. ing.

In FIG. 4(a), the code (18) is the speed generator (1
This amplifier (18) receives the output voltage of step 5) as input, and this amplifier (18) amplifies the input voltage to the voltage necessary to energize the detection relay (^).

In Fig. 4(b), (^1) is a contact that opens when detection relay (8) is energized, (BZ) is an alarm buzzer, and (TA
) is a timer (TA,
) is a contact that closes when the time limit set by the timer (TA) expires, and (B) is a stop relay that stops driving the escalator.

(B,) is a contact that opens when the stop relay (B) is energized;
(C) is the ascending operation relay that is energized when the escalator is ascending, (C+), (C3) is the ascending operation relay (
C) is a contact that closes when energized, (C2) is a contact that opens when ascending operation relay (C) is energized, and (up) is a rising switch that energizes ascending operation relay (C).

(D) is the descending operation relay that is energized when the escalator is descending, (DI), (D,) is the descending operation relay (
D) is a contact that closes when energized, (D2) is a contact that opens when descending operation relay (D) is energized, and (DN) is a descending switch that energizes descending operation relay (D). Further, (P) and (N) are operating power supplies.

Next, the operation will be explained. For example, when operating the above escalator upward, first press the upward operation switch (UP).
) close. Then, the circuit P-8, -C-D2-UP-
N is closed and the upward operation relay (C) is energized.

This closes the contacts (C3) and (C3), and the contacts (C3) close.
2) opens, the circuit P-B, -C-82-C-
N is closed, the upward operation relay (C) is self-held, and the escalator is activated.

When the handrail belt (12) is driven by the activation of the escalator, the roller (16) rotates, and the speed generator (15) outputs a voltage proportional to the speed of the handrail belt (12). Ru. In normal operating conditions, the detection relay (^) is energized by the output voltage from the speed generator (15), so the contact (^1) is open.

Here, the handrail belt (
12) and the -8= driving speed of the handrail belt (12) decreases, the voltage output from the speed generator (15) decreases. When this voltage falls below a predetermined value,
The detection relay (^) is deenergized and the contact (^,) is closed.

This causes the alarm buzzer (BZ) to sound, and
A timer (TA) starts counting the time limit. Then, when the time limit (for example, 1 second) of the timer (TA) expires, the contact (TA1) is closed, the stop relay (B) is energized, and the contact (B, ) is opened, which causes the escalator to
operation will be stopped. If there is no more slippage before the timer (TA) expires, the warning buzzer (BZ) will stop sounding and the escalator will continue to operate.

In addition, as shown in the two-dot chain line in Figure 3, the handrail belt (1
2) comes off the guide (11), the handrail belt (12)
) because the back side of the roller (16) separates from the roller (16).
6) stops, and the output voltage of the speed generator (15) becomes zero. For this reason, the alarm buzzer is activated as in the case of a slip.
After the (BZ) beeps, the escalator operation is stopped.

Note that the descending operation is almost the same as the ascending operation.

As described above, according to the safety device of the above embodiment, slippage and disengagement of the handrail belt (12) can be detected by simply installing one set of devices at one location, so it is possible to significantly reduce costs and , the risk of malfunction is halved and reliability is improved.

In addition, in the above embodiment, the safety device provided in the curved part (B) near the landing was shown, but the safety device is provided in the curved part (B) near the landing, but the safety device is not included in the handrail bell) (12)
Any other position may be used as long as it is a downwardly convex curved portion on the outbound side. However, an escalator with a landing like the one above
In this case, abnormal tension occurs on the curved part (B) near the landing because the weight of the handrail belt (12) and the load from passengers are greater than on the curved part (C) near the lower floor. Since it is easy to use and suitable for detecting slippage and dislodgement, it is preferable to provide it on the curved portion (B) as in the above embodiment.

In addition, in the above embodiment, a control means consisting of the circuit shown in FIG. It is only necessary to be able to control this, and the present invention is not limited to the above embodiments. For example, when the handrail bell (12) comes off, the output voltage of the speed generator will go to zero more rapidly than in the case of a slip, so if the output voltage drops more than a predetermined value, the timer (T^) It is also possible to add a function that stops the escalator without waiting for the count.

Furthermore, in the above embodiment, a speed generator (
15), but other than the above embodiments, for example, the roller (16) is provided with a mark such as a slit or a reflective part, and the rotation of the roller (16) is detected by counting this mark by transmitting and receiving a light beam. It can also be from.

Furthermore, in the above embodiment, a leaf spring (1
4) is shown, but other materials such as a coil spring may also be used.

[Effects of the Invention] As explained above, the escalator safety device of the present invention has a biasing member in contact with the back surface of the downwardly convex curved portion of the handrail belt on the outbound side, and the roller is rotated. Since the rotational speed of the roller is detected by the detector, and the control means controls the drive of the escalator according to the output from the rotation detector, detachment and slippage of the handrail belt can be detected with one set of devices. As a result, costs can be reduced, the entire escalator can be made cheaper, and safety reliability can be improved.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a main part of an escalator with a landing having a safety device according to an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a cross-sectional view of the A schematic side view showing the entire escalator with a landing shown in Fig. 4(a).
) and (b) are circuit diagrams each showing a circuit constituting an example of a control means, FIG. 5 is a sectional view of a main part of an escalator showing an example of a conventional device, and FIG. 6 is a circuit diagram of the escalator shown in FIG. 5.
FIG. In the figure, (12) is a handrail belt, (14) is a leaf spring (biasing means), (15) is a speed generator (rotation detection means), and (16) is a roller. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] A roller that rotates as the handrail belt is driven by contacting the back surface of a downwardly convex curved portion on the forward side of the handrail belt; and a roller that rotates as the handrail belt is driven; A rotation detector that detects the rotational speed of the roller; and a control means that is connected to the rotation detector and controls driving of the escalator according to an output from the rotation detector. An escalator safety device featuring: