JP2005132600A - Car position detection device of elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a car position detection device of an elevator capable of eliminating the branching of light, the alignment of emitted light with a fiber, and an encoder and a zone detection plate used for detecting a present position, which are required in a position detection device using optical fibers, simplifying the structure of equipment on car position detection by compactly collecting instrument device portions at one position, and facilitating installation/maintenance operations. <P>SOLUTION: This car position detection device comprises a fiber mounting rail installed in a hoistway in the lifting direction of an elevator car, a flexible optical fiber installed on the fiber mounting rail along the lifting direction of the car, a pressing roller installed in the elevator car so as to press the optical fiber in lifting the elevator car, a light emitter and a light receiver connected to the end part of the optical fiber, and a measuring instrument detecting the position of the car by measuring a distance between the end part of the optical fiber and the pressing part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an elevator car position detection apparatus using a flexible optical fiber.

  As a conventional elevator car position detecting device, an apparatus utilizing an optical fiber and applying the operating principle of a known optical potentiometer (FIG. 4 of Patent Document 1) has been proposed (see Patent Document 1).

Japanese Patent Laid-Open No. 7-187539 (FIG. 4)

The above-mentioned conventional cage position detection device using optical fibers has a lot of equipment itself, such as a light detection unit and a light receiving unit are installed separately, and a light source needs to be branched for each door zone detection. Is not so good, and there is a possibility of misdetection due to misalignment of the axis of the optical fiber on the light receiving unit side and the light source irradiated to it, or the light emitting part being blocked by dust etc. (for example, when the car shakes) ) And other problems.
The present invention is a car position detecting device using an optical fiber, but has been made to solve the above problems.

  The elevator car position detecting device according to the present invention includes a fiber mounting rail installed in the elevator hoistway along the raising / lowering direction of the elevator car, and a flexible installation installed on the fiber mounting rail according to the raising / lowering direction of the car. Rubber optical fiber, for example, a pressing roller installed in the elevator car so as to press the rubber optical fiber when the elevator car is raised and lowered, an optical transmitter and an optical receiver connected to the end of the rubber optical fiber And a measuring device that measures the distance from the end of the rubber optical fiber to the pressing portion, and measures and measures the distance to the pressing portion to recognize and detect an arbitrary basket position.

  According to the elevator car position detection device of the present invention using a flexible optical fiber installed in the elevator hoistway, no branching of light is required compared to the conventional position detection device using optical fiber, In addition to eliminating the need for axis alignment of the fiber and emitted light, etc., the encoder and zone detection plate that are currently used for position detection are also unnecessary, and the measuring device can be compactly integrated in one place. The configuration of the equipment related to position detection is simplified, installation and maintenance workability is simple and easy, and it is not affected by electrically induced noise, and there is no need to install a position sensor on each floor, so wiring for each sensor is unnecessary. (Simple configuration) enables installation and measurement even in tight spaces, reducing space and costs.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In addition, the same code | symbol shows the same or an equivalent part between each figure.

Embodiment 1 FIG.
FIG. 1 is a schematic diagram showing a main part of an elevator car position detecting device according to Embodiment 1 of the present invention, FIG. 2 is a schematic diagram when an optical fiber is pressed by a pressing roller, and FIG. 3 is an incident pulse of a measuring device. It is a conceptual diagram which measures the position of a cage | basket by a reflected pulse.
The elevator car position detecting apparatus according to the first embodiment of the present invention is flexible in, for example, a rubber optical fiber, on a fiber mounting rail 4 installed in the elevator hoistway 9 along the elevating direction of the elevator car 5. 1 is attached according to the raising / lowering direction of the car, and the position of the elevator car 5 is detected as described later. This rubber optical fiber is composed of a known core (silicon rubber), clad (silicon rubber), and jacket (fluorine rubber), and has a flexible structure.
Further, as shown in a cross section in FIG. 2, the cage 5 cooperates with the cage and pushes the outer peripheral surface of the optical fiber 1 when the cage is raised and lowered, while the pressing portion A reflects the incident light reflection surface B. A pressure roller 10 is installed, and this pressure roller 10 is rotatably supported by the shaft 11 of the roller frame 14 fixed to the ceiling of the cage 5 so as to always press the rubber optical fiber 1. Yes.
The measuring device 2 installed in the control panel 3 that controls the entire elevator includes a known optical transmitter (not shown) that transmits the incident light P1, and the reflection surface B formed by the pressing portion A. A known optical receiver (not shown) for receiving the reflected light P2, a calculation unit, and the like are incorporated.
The optical transmitter and the optical receiver of the measuring device 2 are connected to the upper end portion of the optical fiber 1 and measure the propagation time from the transmission of incident light to the reception of reflected light to the pressing portion A. Measure the distance and detect the position of any of the above baskets. In addition, 6 is a hoisting machine, 7 is a rope, and 8 is a counterweight connected to the cage 5 by this rope.

Next, the operation will be described.
When the cage 5 is raised and lowered, the pressing roller 10 moves up and down in the hoistway 9 while pressing the rubber optical fiber 1. At this time, when the incident pulse P1 is transmitted from one end of the rubber optical fiber 1 by the optical transmitter in the measuring device 2, the light is reflected by the reflection surface B of the pressing portion A and reflected in the measuring device 5 as the reflected pulse P2. Come back to the receiver.
In general, the group velocity Vg of light is given by the following equation (1).

In the above equation, β is a propagation constant and ω is an angular frequency.
As shown in FIG. 3, by measuring the propagation time until the reflected pulse P2 returns after the incident pulse P1 is reflected by the reflecting surface B of the roller pressing portion A, the above equation (speed and time) can be obtained. The distance to the pressing part A can be measured. Therefore, if the distance from the measuring device 2 to the pressing portion A is known, the position of the basket 5 can be specified. In addition, by continuously inputting the pulsed light P1 incident from the optical transmitter with a short period, it is possible to detect any continuous car position.

Embodiment 2. FIG.
FIG. 4 is a sectional view showing a pressing roller according to Embodiment 2 of the present invention.
The roller frame 14 of the pressing roller 10 shown in FIG. 4 is provided with the following device to prevent the rubber optical fiber 1 from being excessively pressed. That is, 12 is a pressure limiting roller for preventing excessive pressing, and is supported by the pressure limiting roller shaft 13 at a position between the fiber mounting rail 4 and the pressing roller shaft 11 and is pressed by appropriately contacting the fiber mounting rail 4. The movement of the roller 10 is restricted and the rubber optical fiber 1 is prevented from being excessively pressed.
As described above, since the pressing limit roller 12 is provided separately from the pressing roller 10 and the pressing limit roller 12 comes into contact with the fiber mounting rail 4 before the pressing roller 10 is brought into an excessive pressing state, the movement of the pressing roller 10 is restricted. It is possible to prevent the optical fiber 1 from being pressed excessively, prevent the optical fiber from being broken, and extend the life of the optical fiber.

  Although not shown in particular, instead of installing the rubber optical fiber 1 on the dedicated fiber mounting rail 4, a normal cage guide rail (shown in FIG. 1 of Patent Document 1) is used as a fixed installation place of the rubber optical fiber. The rubber optical fiber 1 may be installed on a rail corresponding to a car guide rail). In this way, installation space and cost can be reduced.

  It can also be applied to position detection of rail-type moving objects such as cranes, lifts and hoists.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a main part of an elevator car position detection device according to Embodiment 1 of the present invention; It is a schematic diagram when a rubber optical fiber is pressed by a pressing roller. It is a conceptual diagram which measures the position of a cage with an incident pulse and a reflected pulse. 6 is a cross-sectional view showing a pressing roller according to Embodiment 2. FIG.

Explanation of symbols

1 Rubber optical fiber. 2 Measuring device.
3 Control panel. 4 Fiber mounting rail.
5 Elevator basket. 6 Hoisting machine.
7 Rope. 8 Balance weight.
9 Hoistway. 10 Pressing roller.
11 Pressing roller shaft. 12 Press limit roller.
13 Press restricted roller shaft. 14 Pressing roller frame.
P1 Incident light. P2 Reflected light.
A Roller pressing part. B Reflective surface.

Claims (3)

  A fiber mounting rail installed in the elevator hoistway along the lifting direction of the elevator car, a flexible optical fiber installed on the fiber mounting rail according to the lifting direction of the car, and when the elevator car moves up and down A pressing roller installed in an elevator car to press the optical fiber, an optical transmitter and an optical receiver connected to the end of the optical fiber, and a distance from the end of the optical fiber to the pressing unit. An elevator car position detecting device comprising a measuring device for measuring and detecting the position of the car.   2. The elevator car position detecting apparatus according to claim 1, further comprising a pressing restriction roller that comes into contact with the fiber mounting rail before the outer periphery of the pressing roller.   3. The elevator car position detecting apparatus according to claim 1, wherein the optical fiber is installed on a guide rail of the elevator.

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