JPH03120191A - Safety device for elevator door - Google Patents

Abstract

PURPOSE:To eliminate misoperation by cool and hot air by providing at least two temperature sensors in the vicinity of a cage gate, directing the sensors in a manner, wherein the ambient temperature in a riding spot is detected by the one sensor with the predetermined position temperature in the riding spot detected by the other sensor, and detecting an output difference between both the temperature sensors so as to control open-close action of a door. CONSTITUTION:In an environment in a riding spot 2 of an elevator, since air passes through a gate total unit with the hot cool air rarely existing locally, the first and second temperature sensors 20, 21 are equally influenced by the hot and cool air, and respective outputs of gain adjusters 22, 23 are also amost equal. However, detecting ability of a passenger 1 in the riding spot is provided not in the sensor 21 not faced to the passenger but in the sensor 20 faced to the passenger. Accordingly, when an output difference between the sensors 20 and 21 is taken, an output difference by the hot and cool air is generated small with the output difference by the passenger 1 in the riding spot large generated. Whether the passenger is present or not is judged by detecting a level in a peak of an output from a differential amplifier 24, and a door control circuit 25 is actuated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to an improvement in the safety device of an electric door at the entrance/exit of an elevator car.

[Conventional technology]

As a method for detecting a person in the middle of the closing movement of an electric door, for example, as disclosed in Japanese Patent Publication No. 43-23248, "a pair of antennas each having ground capacitive coupling are placed at a distance from each other on the opening/closing door. There is a method called "AC bridge mechanism" that detects the presence or absence of nine people. In addition, in recent years, there are systems that use heat-sensitive sensors to detect people near the electric door and control the opening and closing of the electric door. This type of thermal sensor uses an infrared ray element to detect the infrared rays of the wavelength emitted from the object in a non-contact manner, corresponding to the temperature of the object. In a conventional example where this heat-sensitive sensor is installed at a predetermined position near an electric door with special directivity, it can normally detect whether a person is present at a predetermined position or not, and control the opening/closing of the door. It is carried out.

[Problem to be solved by the invention]

Elevators are installed in buildings such as department stores and offices where many people come and go, so there are often cold and hot air from air conditioning and heating at the elevator platform, and there is a gap between the floor and the floor surface that the thermal sensor normally detects. There is a problem in that when cold and hot air flows in with a large temperature difference from the floor surface, it can be mistakenly judged as a foreign material intrusion, that is, a human intrusion.

The present invention aims to eliminate such malfunctions of safety devices caused by cold and hot air.

[A precautionary measure to solve the problem]

The safety device according to the present invention is equipped with a heat-sensitive sensor near the entrance and exit of the elevator car, which detects the ambient temperature of the landing on one side and the temperature at a predetermined position in the elevator landing on the other. It has directivity, detects the difference in output between these two heat-sensitive sensors, and controls the opening/closing operation of the electric door.

[Effect]

A directional thermal sensor that detects ambient temperature and a directional thermal sensor that detects people are both affected by cold and hot air from air conditioning and heating, so when no one is around, the difference in output does not include the difference in output. It is possible to detect differences between people when they are present.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention.

In the figure, fi+ is the passenger at the platform, +2) I1 platform, and 13) is boarding! # Door opening/closing electrical equipment, (4) is the transfer area door, α
D is the passenger in the elevator car, +13 is the car, and aS is the door opening/closing device.

C4 is the first heat-sensitive sensor, and C4 is the second heat-sensitive sensor. #c1 thermal sensor (to)
It is easy to detect the passenger (1) in the bathtub, and sends a special signal with directivity in a diagonally downward direction. In addition, the second thermal sensor 1
The 2υ has sensitivity directionality in the horizontal direction, which makes it difficult to detect passengers in the boarding area, so to speak, it is designed to detect the temperature of the passenger air in the boarding area. FIG. 2 is a block diagram of the detection circuit. In the figure, reference numerals a and C13 each represent a gain adjuster, which adjusts the gain so as to equalize the output level of the thermal sensor @1 and the output level of the second thermal sensor Qp due to hot and cold air. (2) is a gain adjuster (to), a differential amplifier that detects the output difference of 121 and determines whether there is a person present, @ is the door control circuit, and the output of the differential amplifier @ is also used for the gap between the doors. Open and close. Figure 3 is @1. This is an output diagram of the second thermal sensor anon and the differential amplifier @, and the outputs are shown as X, Y, and Z, respectively.

The environment of the elevator platform (2) is such that hot and cold air rarely exists locally and passes through the entire entrance/exit. Second heat-sensitive sensor c! Den is not equally affected by the hot and cold air, and as a result, the outputs of each of the four gain adjustments become approximately equal. However, the detection ability for passenger (1) at platform 1 is directed towards passenger 1 h4
It is located at the heat sensitive sensor (to) of 1.

There is no second thermal sensor 2m) K that does not face the passenger. Therefore, when considering the difference in output between the first thermal sensor (to) and the second thermal sensor C11, the difference in output due to hot and cold air is small, and the difference in output between passengers at the two platforms is large. FIG. 3 shows this state. By looking at the peak size of the output (Z) of the differential amplifier 24 in Fig. 3, it is determined whether there is a passenger or not, and the door control circuit (c)
is activated.

〔Effect of the invention〕

As explained above, the present invention is configured to take the difference in the output of two heat-sensitive sensors that are affected by cold and hot wind almost equally, so the difference in output will be large when there are passengers at the boarding area. 9 It is possible to increase the detection sensitivity of whether a passenger is present or not.

As a result, it is possible to perform stable door opening/closing control, thereby increasing the safety of the two passengers.

[Brief explanation of drawings]

@Figure 1 is a perspective view of the main part of the actual example, Figure 2 is a block diagram of the detection circuit, and Figure 3 is the output diagram of the detection circuit.
is the passenger at the boarding area, C2) is the boarding area, 14) is the boarding door,
fi is the passenger in the elevator car, (I4 is the car door, gloss is the first thermal sensor, QDF1t42 thermal sensor, slope, (to) is the gain adjuster, c!4 is the differential amplifier,
(to) is the door control circuit. In addition, in FIG. 9, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] At least two heat-sensitive sensors are provided near the entrance of the elevator car, one of these heat-sensitive sensors is made to detect the presence or absence of passengers on the platform, and the other heat-sensitive sensor is made to detect the ambient temperature of the platform, and the outputs of both of these heat-sensitive sensors are A safety device for an elevator door characterized by detecting the difference and controlling the opening/closing operation of the electric door.