JPS62196287A - Deflection detector for tail code of elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a device for detecting deflection of an elevator tail cord.

[Conventional technology]

For example, the tail cord of an elevator is
-41933, a long cable connects the bottom of the car and the wall of the hoistway at approximately the middle, and runs up and down along with the first car. and,
Brackets for fixing the rails, metal fittings for detecting the position of the car, etc. are attached to the walls of the hoistway.

Due to the above configuration, an earthquake may occur while the 9-car car is running.
When the building swings from side to side, the tail cord also swings from side to side, causing the problem that the tail cord gets caught on a protrusion such as a bracket fixed to the wall of the hoistway, causing the tail cord to break.

As a solution to this problem, for example, Japanese Patent Application Laid-Open No. 60-15382
As shown in , an acceleration sensor is installed in the machine room of the elevator, and the output of this acceleration sensor is integrated twice to calculate the displacement of the machine room. If this displacement exceeds a predetermined value, the tail cord is in the dangerous range. A method has been proposed in which the elevator is estimated to have reached this point, the elevator is stopped, and the tail cord is inspected to see if it is damaged.

[Problem that the invention seeks to solve]

By the way, the deflection of the tail cord has a natural period,
If the machine room swings with this natural period, the tail cord will swing significantly even if the displacement of the machine room is small. Since the period is different from the natural period, the tail cord hardly swings. That is, since the displacement of the machine room and the deflection of the tail cord do not necessarily correspond 1:1, there is a problem in that it is very difficult to determine the set value of the displacement of the machine room.

An object of the present invention is to provide a device that does not indirectly detect the deflection of the tail cord, but directly detects the deflection of the tail cord in real time using a simulation circuit with high precision.

[Means for solving problems]

The above purpose is to install an acceleration sensor in the machine room of the elevator, use this installation location as an excitation source, simulate the vibration state of the tail cord with an electric circuit, calculate the deflection of the tail cord in real time, and It is designed to generate an output when the calculated value exceeds the set value.

[Effect]

With this configuration, the deflection of the tail cord can be calculated accurately in real time, resulting in a highly accurate detection device.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In addition, the same reference numerals 5 in the figure indicate the same parts.

FIG. 2 is a schematic diagram of the elevator hoistway. In the figure, 1 is a machine room, 2 is a drive motor provided in the machine room 1, 3 is a hoistway, and 4 is a car attached to the end of a rope 5. The heel 4 runs up and down via the lobe 5. 6 is a metal fitting 7 fixed to the bottom of the seat 4 and approximately the center of the hoistway 3.
With a tail cord connected with a long cable,
It moves up and down with the driver and 4. Reference numeral 8 represents an acceleration sensor installed on the floor of the machine room 1, and reference numeral 9 represents the main body of a tail cord deflection detection device.

Because of this structure, when the hoistway 3 swings left and right due to an earthquake or wind, the tail cord 6 is vibrated left and right using the seat 4 and the metal fitting 7 as fulcrums.

Now, the mass of the tail cord is m, the damping constant is C1, the length is Q
, the vibration is X, the acceleration of gravity is g, the time is written, and the acceleration of the recording chamber, that is, the output of the acceleration sensor 8 is A.
(t), then the following holds true. Transforming equation (1), we get: Therefore, by calculating the deflection X in real time from equation (2), the actual deflection X of the tail cord can be obtained.

By the way, this differential equation can be solved in real time using a simulation circuit that electrically simulates the constants and variables described above, and the simulation circuit is shown in FIG.

In the figure, 1o is an adder, 11.12 is an integrator, 13
．． 14 is a code converter, 15, 16.17 are potentiometers, and 18, 19, 20.21 are acceleration sensors 8. Adder 10. At the output terminals of the integrators 11 and 12, the input of the potentiometer 15 is connected to the output terminal 18 of the acceleration sensor 8, and the input of the potentiometer 16 is connected to the output terminal 20 of the integrator 11.
and the sign converter 13, the input of the potentiometer 17 is connected to the output terminal 21 of the separator 12 and the sign converter 14,
The respective outputs are added by an adder 10.

Then, by setting the values of potentiometers 15 and 16.17 to 1+ c/m and g/Q, respectively, and the time scale of integrator 11.12 to 1 second, the differential equation of equation (2) is satisfied. The output terminals 19, 20, and 21 receive the acceleration of the tail cord 6.

A voltage proportional to speed and deflection is generated.

22 is a comparator which compares the voltage at the output terminal 21 of the integrator iL2 with the voltage at the output terminal 23 of the set voltage, and when the voltage at the output terminal 21 exceeds the voltage at the output terminal 23, the comparator 2
The configuration is such that an output voltage is generated from the second output terminal 24.

Next, the operation of this device will be explained.

Suppose now that an earthquake occurs and an acceleration of A (t) occurs in the acceleration sensor 8. When this acceleration A (t) is applied to the potentiometer 15, a voltage proportional to the deflection of the tail cord 6 is generated at the output terminal 21 of the integrator 12, and when this voltage exceeds the set voltage at the output terminal 23, , an output voltage is generated at the output terminal 24 of the comparator 22, and it is possible to detect that the tail cord 6 has swung significantly. Then, the elevator is stopped at the nearest lock by a control circuit (not shown).

Although the acceleration sensor 8 was installed in the machine room 1 in this embodiment, it is not necessarily necessary to install it in the machine room 1, and it may be installed on an intermediate floor. Further, although the vibration state is expressed by a second-order linear differential equation, it is of course possible to represent the vibration state by a distributed constant circuit and solve it by a partial differential equation in order to improve the accuracy.

〔Effect of the invention〕

According to the present invention, an acceleration sensor is installed in the machine room of an elevator, the vibration state of the tail cord is simulated using an electric circuit using this installation location as an excitation source, and the deflection of the tail cord is calculated in real time. Since the magnitude of shake is detected when the voltage proportional to the image quality exceeds a predetermined value, a highly accurate detection device can be replaced.

[Brief explanation of drawings]

FIG. 1 is an electrical simulation circuit diagram of an embodiment of the present invention.
FIG. 2 is a schematic diagram of the elevator hoistway.

Claims (1)

[Claims] 1. An elevator device that includes a car that runs in a hoistway provided in a building and a tail cord that connects the bottom of the car and approximately the center of the hoistway with a long cable. , an acceleration sensor is installed in the building, and the vibration state of the tail cord is simulated by an electric circuit using the location where the acceleration sensor is installed as an excitation source, and a voltage at a portion proportional to the vibration in the simulation circuit is generated. An elevator tail cord deflection detection device, characterized in that it is provided with a means for detecting that the value exceeds a set value. 2. The elevator tail cord deflection detection device according to item 1, wherein the simulation circuit is a solution of a second-floor linear differential equation.