JPS6038310B2 - Elevator position detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an elevator position detection device, and particularly to an elevator position detection device suitable for continuously and precisely detecting the car position.

．． [Background of the Invention] FIG. 1 shows a method for detecting the position of a subordinate elevator car.

A car 2 is located in the hoistway 1 and is raised and lowered by ropes (not shown). A steel tape 3 is attached to the car 2 as shown in the figure, and a floor selector 4 in the machine room is attached.
is connected to. This floor selector is a well-known type that reduces the hoistway, installs electrical contacts at the positions assigned to each floor, and has a synchronized panel that moves proportionally to the car assigned.
By attaching movable contacts to this, the position of the elevator car was detected. Furthermore, a method is known in which a limit switch 5 is provided at a position associated with each floor in the hoistway 1 and operated by a cam 7 attached to a car to determine the elevator's temperature.

However, these methods have problems such as difficulty in continuous position detection, the need to put steel tape inside the hoistway or install limit switches, etc., and maintenance thereof is difficult. was there.

Therefore, in order to eliminate the need for this limit switch etc.,
Yasukoshi No. 51-1778 was equipped with a projector that projects light upward from the bottom of the hoistway, and an optical device that refracts this light horizontally under the car, and the horizontally refracted light is transmitted to each floor. A method has been proposed in which the position of the car is detected by counting the reflected light at the lower part of the elevator by reflecting the reflected light from a reflecting mirror installed at the stop position on the floor and refracting the reflected light downward again. There is.

In other words, this method installs a reflector instead of a limit switch, and is excellent in that it eliminates the need for wiring for the limit switch, but it requires installation of a reflector on each floor, and Detecting the position continuously in a narrow and continuous manner is practically difficult because it is necessary to install reflecting mirrors in a narrow and continuous manner at the corresponding location. [Object of the Invention] The object of the present invention is to provide an elevator having a machine room at the top of the hoistway, which has excellent workability and maintainability, and is capable of continuously detecting car positions with high reliability. To provide a position detection device.

[Summary of the invention]

The present invention applies head-to-head distance technology using radar, laser, or optical electromagnetic waves, and is characterized by a device that transmits electromagnetic waves from the top of the hoistway toward the car, or from the car to the hoistway. The position of the car is detected by installing a device that transmits electromagnetic waves toward the bottom and using the reflected waves to measure the distance between the top of the hoistway and the car, or between the car and the bottom of the hoistway. That's where I did it.

Therefore, the car position can be continuously detected without installing many switches in the hoistway, and there is no need to arrange an electromagnetic wave transmitter at the bottom of the hoistway. Since it can be installed facing downward, it not only facilitates signal transmission with the machine room installed at the top of the hoistway, but also prevents damage caused by falling objects or inability to detect due to flooding or bonito, making it a highly reliable location. detection can be provided. [Embodiment of the Invention] FIG. 2 is a sectional view of an elevator hoistway showing an embodiment of the present invention, and FIG. 3 is a block diagram of an elevator car position detection system according to the present invention. It is.

In the elevator 1, a car 2 is connected to a hanging weight 7 via a rope 8, and hung on a sheep 9. The sheep 9 is driven by a drive motor (not shown) to raise and lower the sheep 2. The radio waves generated at the radar device 10 are emitted from the transducer 11, reflected at the top or bottom of the hoistway, and returned to the receiver again, where the central processing unit calculates the delay time or phase difference between the transmitted and received waves. processing, detecting the position of the elevator car, and controlling the elevator. The elevator control device for each unit in Figure 3 can be operated simultaneously within the CPU, and this method can be easily applied to elevators that have minicomputers or microcomputers as control devices, and is similar to conventional methods. Compared to conventional methods, a number of benefits can be expected, including a reduction in construction work within the hoistway, simplification of maintenance and adjustment, improved detection accuracy, and continuous detection points.

4 and 5 show other embodiments of the present invention, and the difference from FIG. 2 is that in FIG. 4, the radar device 10 and the transducer 11 are installed at the top of the hoistway. It is.

This embodiment also has the advantage that maintenance and adjustment of the radar device can be performed in the machine room without entering the hoistway, and there is no need to send and receive power and signals to and from the elevator car. FIG. 5 shows an economical and efficient method for detecting the positions of a plurality of elevator cars using a single radar device in the example of FIG. 4.

In this embodiment, the distribution of electromagnetic waves (or pulses) from the radar device 10 to the transducers 11, 11', and 11'' for each elevator is performed in a time-sharing manner that shifts the operation of each transducer. There are two methods: a method in which calculations and position detection are performed by a processing device, and a method in which each transducer uses a different frequency and performs measurement and calculation detection by dividing the frequency. Either method can achieve the object of the present invention. Moreover, it is economical to be able to detect the positions of multiple cars with one radar device.According to this embodiment, the position detection of elevator cars can be realized continuously and with high precision, and This not only reduces construction work and maintenance and adjustment work, making the work safer and easier, but also has the advantage of being able to detect the positions of multiple elevator cars with a single radar device.
Also, what was previously referred to as a radar device is a visible light,
It is clear that the same effect can be expected even if the system is replaced with a device that measures position using electromagnetic waves such as ultraviolet rays, infrared rays, and radar, and it is also economically advantageous.

〔Effect of the invention〕

According to the present invention, the car position can be continuously detected without providing a large number of switches etc. in the hoistway,
The electromagnetic wave transmitting/receiving device for this purpose is installed at the top of the hoistway or on the car side facing downward, making it easy to transmit signals to and from the machine room installed at the top of the hoistway. etc., and highly reliable position detection can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a conventional elevator position detection device, FIG. 2 is a schematic diagram illustrating an elevator position detection device according to the present invention, and FIG. 3 is a block diagram showing an elevator position detection device according to the present invention. , Figures 4 and 5
The figure is another schematic diagram of the elevator position detection device according to the present invention. 1... Hoistway, 2... Elevator car, 10... Radar device, 11...
...Transducer/receiver. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. A machine room provided at the top side of an elevator hoistway, and detecting the position of a car that is suspended from the machine room and ascends and descends within the hoistway. The system is equipped with a device that transmits electromagnetic waves from the top of the hoistway toward the car, and a device that receives reflected waves from the car, and the distance between the top of the hoistway and the car measured using the received signals. An elevator position detection device comprising a device for detecting the position of the car based on distance. 2 A machine room is provided at the top of an elevator hoistway, and a plurality of cars suspended from the machine room and moving up and down each hoistway are arranged side by side, and the positions of these cars are detected. , in the hoistway, a device for transmitting electromagnetic waves from the top of the hoistway toward the car and a receiving device for receiving reflected waves from the car are provided for each car, and the reception for each car is provided. The respective numbers are input to a common processing device, and the processing device uses the received numbers for each car to measure the distance between each car and the top of the hoistway, and calculates the distance between each car and the top of the hoistway. An elevator position detection device characterized by having means for detecting a position. 3 A machine room is provided on the top side of an elevator hoistway, and in an equipment that detects the position of a car that is suspended from the machine room and moves up and down in the hoistway, when the car is lifted up and down from the car in the hoistway. Equipped with a device that transmits electromagnetic waves toward the road bottom and a device that receives reflected waves from the bottom, and from the distance between the bottom of the hoistway and the car measured using the received signals from the receiving device, An elevator position detection device characterized by comprising a device for detecting the position of the car.