JPH08113441A - Elevator abnormal vibration detection device - Google Patents

Abstract

(57) [Summary] [Purpose] Installing a device to detect vibration separately,
(EN) An inexpensive abnormal vibration detection device for an elevator that does not require troublesome adjustment work. [Structure] The speed detection device 4a counts the pulse signal output from the rotary encoder 4b directly connected to the rotary shaft of the hoisting machine 1 every 40ms, and the arithmetic device 4c calculates the count value when the elevator is steadily running. The difference ΔP _L is calculated, and the period between the time at which the maximum value with respect to the time of the count value is given and the time at which the subsequent maximum value is given is obtained as a vibration cycle, and whether or not it is within the range of a preset setting cycle. The vibration determination device 4f determines whether or not the amplitudes of both vibrations for which the vibration cycle is obtained are larger than the reference value output from the determination value generator 4e. If they are larger, both vibrations are generated in the car. It was decided to be an artificial abnormal vibration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormal vibration detecting device for an elevator, which detects an artificial abnormal vibration generated in a car during steady running of the elevator.

[0002]

2. Description of the Related Art Elevators are equipped with various protection mechanisms to ensure the safety of passengers. For example, when a car abnormally vibrates due to an abnormality on a road or an earthquake, the governor device detects the abnormal vibration via a governor rope and a protective device is provided to stop the elevator in an emergency. By the way, when a child, a drunken person, etc. playfully or violently moves in the car, the governor device may detect this vibration and cause the elevator to stop urgently although the elevator is normal. In order to avoid such inconvenience,
There has already been proposed a protection device in which a shock absorber is attached so that the governor device does not detect artificial vibration, and the artificial vibration is absorbed on the way. However, when a large vibration is applied, it cannot be effectively prevented. Therefore, in Japanese Examined Patent Publication No. 3-8693, a rotating shaft is provided in a direction perpendicular to the vertical direction of the car,
One end is engaged with this rotating shaft, and the other end has a detection rod suspended from the car through a spring.When vibration occurs in the car, the detection rod rotates due to expansion and contraction of the spring. Disclosed is an invention of an elevator vibration determination device that is configured to vibrate in the vertical direction with respect to a moving shaft, and that determines whether or not the vibration generated in the car by examining the vibration of the detection rod is artificial. There is.

[0003]

In the above-mentioned prior art, not only the vibration determination device using a spring must be attached to the elevator car, but also the attachment position of the detection rod is determined according to the elastic coefficient of the spring. Must be adjusted, an extra installation space and installation cost are required, and the work of adjusting the mounting position of the detection rod is difficult and time-consuming. It is an object of the present invention to provide an inexpensive abnormal vibration detection device for an elevator, which does not require a separate device for detecting vibration or requires troublesome adjustment work.

[0004]

In order to solve the above-mentioned problems, the present invention provides a traveling speed measuring means for measuring the traveling speed of a car while traveling, and a steady traveling of an elevator measured by the traveling speed measuring means. Vibration cycle calculating means for calculating the fluctuation of the traveling speed of the car every moment, and obtaining as a vibration cycle the period between the time at which the maximum value of the traveling speed is given and the time at which the following maximum value is given, The vibration cycle calculated by the vibration cycle calculating means is within a predetermined set cycle range, and the difference between the maximum value and the minimum value of the traveling speed within one cycle when the vibration cycle is calculated is calculated. The amplitudes of both vibrations are compared, and the amplitudes of both vibrations are compared with a predetermined reference amplitude, and when the amplitudes of both vibrations are larger than the reference amplitude, both vibrations for which the vibration cycle calculation means obtains the vibration cycle are placed in the car. Artificial differences that have occurred Those having a abnormal vibration determining means for determining the vibration.

[0005]

The traveling speed measuring means measures the traveling speed of the car while it is traveling. The vibration cycle calculation means calculates the fluctuation of the traveling speed of the car every moment when the elevator is traveling steadily measured by the traveling speed measuring means, and gives the time at which the maximum value of the traveling speed with respect to time and the subsequent maximum value are given. The period between time and time is obtained as the vibration cycle. The abnormal vibration determination means is 1 when the vibration cycle calculated by the vibration cycle calculation means is within the range of a preset set cycle and the vibration cycle is calculated.
The difference between the maximum value and the minimum value of the running speed within the cycle is taken as the amplitude of both vibrations, and the amplitudes of both vibrations are compared with a predetermined reference amplitude. The cycle calculation means determines both vibrations for which the vibration cycle has been obtained as artificial abnormal vibrations that have occurred in the car.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing the outline of an apparatus according to an embodiment of the present invention. In the figure, 1 is a hoist of an elevator, 2 is a rotary shaft of the hoist 1, and
The rotary encoder 3 that outputs a pulse signal proportional to the number of revolutions of the vehicle, that is, the pulse signal proportional to the moving distance of the car (not shown) receives the pulse signal of the rotary encoder 2 and controls the operation and stop of the elevator. The elevator control device 4 that performs the same also receives the pulse signal of the rotary encoder 2 and checks the fluctuation of the rotation speed of the hoisting machine 1, that is, the vibration of the car to determine whether there is abnormal vibration. Is an abnormal signal output device that outputs an abnormal signal notifying that an abnormal artificial vibration has occurred in the car based on the abnormal vibration data output from the abnormal vibration determination device 4, and 6 is various for passengers in the car. In-car broadcasting device for broadcasting the guide information of a building, 7 is a remote monitoring center that monitors the status of elevators in a plurality of buildings based on information sent via telephone lines. It is. The abnormal vibration determination device 4 uses the pulse signal output from the rotary encoder 2 for 40 ms.
The speed detection device 4a that counts each time, the speed memory 4b that stores the converted value of the rotation speed of the hoisting machine 1 when the car is traveling normally, and the rotation speed of the hoisting machine 1 that is traveling normally. An arithmetic unit 4c that calculates the fluctuation as a change in the count value of the pulse signal output from the rotary encoder 2 and determines whether the cycle between the maximum values of the count value of the pulse signal is within a predetermined cycle. When the cycle is within a predetermined cycle, both vibration memories 4d that store both vibrations, a judgment value generator 4e that outputs predetermined reference value data, and both vibration memories 4d
Magnitude of amplitude of both vibrations stored in memory and judgment value generator 4e
The vibration determination device 4f that determines whether the amplitudes of both vibrations are abnormal values by comparing the reference value data output from the abnormal vibration memory 4 that stores the amplitudes of both vibrations that are determined to be abnormal values.
g and.

Next, the operation of this embodiment will be described with reference to FIGS. 2 is a flow chart of abnormal vibration detection processing,
FIG. 3 is a speed graph showing a specific example of measuring the rotation speed of the hoisting machine 1 from when the elevator starts to when it stops.
FIG. 4 is an enlarged graph of the main part of FIG. The operation will be described below according to the procedure based on the flowchart of FIG. When the elevator is activated, the hoisting machine 1 rotates, and the pulse signal output from the rotary encoder 2 is received, the abnormal vibration detection process starts. The speed detection device 4a counts the pulse signal from the rotary encoder 2 every 40 ms, and further calculates the difference ΔP _L. Then, the sum .SIGMA..DELTA.P _L of the difference [Delta] P _L of the pulse signal count P _L within a certain period if positive, elevator judges during acceleration operation, and during deceleration if negative. That is, in step S1, it is determined whether or not ΣΔP _L > 0. ΣΔP _L > 0, that is, the pulse signal count value P _L
Is increasing and the car is accelerating (period T ₀ ~
At T ₁ ), the speed monitoring is continued as it is. Judgment result is N
If the determination result of whether ΣΔP _L <0 is Yes in step S2 in o, the pulse signal count value P _L is decreasing.
That is, it is determined that decelerating (period T ₄ through T _5), stops the counting operation of the pulse signal by the speed detector 4a (Step S12), and ends the process. The determination result in Step S2 is No, that is, not even during deceleration passenger cage even during acceleration, i.e., when it is in the steady running (period T ₁ through T ₄₎ is
The process moves to the following abnormality determination. The speed detection device 4a uses the pulse signal count value P _L (P _1-
P _n ) are sequentially stored in the speed memory 4b (step S
3). Next, the arithmetic unit 4c reads the pulse signal count P _L from the speed memory 4b, obtaining the maximum value P _X of the pulse signal count P _L to the difference [Delta] P _L is reversed from positive to negative (Step S4). As shown in FIG. 3, during steady running (period T
₁ through T ₄₎ when the short-period vibrations UV occurs, time T _2,
, The pulse signal count value P _X1 at time T ₃ , and the pulse signal count value P _{X2 at} time T ₃ are local maximum values. Then, the period T _{2 to} T ₃ between the maximum value P _X1 and the maximum value P _X2 is calculated, and the short cycle vibration UV is generated.
1 cycle PD is obtained (step S5). The arithmetic unit 4c determines whether or not one cycle PD of the short cycle vibration UV thus obtained is within a cycle corresponding to the frequency of abnormal vibration (3 to 4 Hz) which is the resonance frequency of the main rope and the car (procedure). S6), if the result is Yes, both vibrations are stored in both vibration memory 4d.
To store (step S7). The vibration determination device 4f reads the maximum value (maximum value) P of both vibrations read from both vibration memories 4d.
The difference (P _X1 −P _N ) is calculated from _X1 and the minimum value (minimum value) P _N , and the value is set as the amplitude W of both vibrations (step S8). Then, the amplitude W is compared with the reference value data output from the determination value generator 4e, and it is determined whether the amplitude W of both vibrations is larger than the reference value data. It is determined whether the short cycle vibration UV is abnormal vibration (step S9). If the result is Yes, both vibrations of the short cycle vibration UV are determined to be abnormal vibrations, and the amplitude W thereof is stored in the abnormal vibration memory 4g (step S10). Amplitude W of both vibrations determined to be abnormal vibrations in the abnormal vibration memory 4g
Is stored, the abnormal signal output device 5 outputs an abnormality to the in-car broadcasting device 6 and the monitoring center 7 via the telephone line based on the amplitude W of both vibrations determined to be the abnormal vibration output from the abnormal vibration memory 4g. A signal is output (step S11).
Upon receiving the abnormal signal, the in-car broadcasting device 6 broadcasts a guidance broadcast urging passengers in the car to stop violent movements. In addition, at the monitoring center 7 that has received the abnormal signal, the fact that an artificial abnormal vibration has occurred in the car in the elevator of the building is recorded.

As described above, in the present embodiment, when a child, a drunken passenger, etc. playfully or violently moves in the car and an artificial abnormal vibration occurs in the car, the abnormal vibration is promptly detected to notify the passenger. Since it is designed to broadcast a guidance broadcast that prompts the user to stop violent movements immediately, it prevents the governor device from operating due to artificial vibrations in the car, causing an emergency stop of the elevator. Elevator restoration work can be avoided and smooth elevator operation can be ensured. Further, even if the elevator is stopped due to this artificial abnormal vibration, the cause can be recognized in advance by the monitoring center 7, so that prompt and appropriate measures can be taken.

[0009]

As described above, according to the invention of claim 1, the traveling speed of the car during traveling is measured moment by moment, and the fluctuation of the traveling speed of the elevator during steady traveling is calculated,
The period between the time when the local maximum of the traveling speed is given and the time after which the local maximum is given is obtained as the vibration cycle,
The vibration cycle is within a predetermined set cycle range,
In addition, the amplitude of both vibrations, which is the difference between the maximum value and the minimum value with respect to time of the running speed within one cycle, is compared with a predetermined reference amplitude, and when both amplitudes are larger than the reference amplitude, both vibrations are multiplied. Since it was determined that it was an artificial vibration generated in the car, a device for detecting vibration was installed separately,
It is possible to provide an inexpensive and reliable abnormal vibration detection device for an elevator that does not require troublesome adjustment work. According to the invention of claim 2, by counting the pulse signals within a predetermined short period output from the rotary encoder that outputs a pulse signal proportional to the rotation speed of the rotary shaft of the elevator hoisting machine, Since the running speed of the car is measured moment by moment, abnormal rotation of the elevator can be detected easily without using any new equipment by using the rotary encoder provided in a normal elevator. You can

[Brief description of drawings]

FIG. 1 is a configuration diagram schematically showing an abnormal vibration detection device for an elevator according to an embodiment of the present invention.

[Fig. 2] Flow chart of abnormal vibration detection processing

FIG. 3 is a speed graph showing a specific example in which the rotation speed of the hoisting machine from start to stop is measured.

FIG. 4 is an enlarged graph of a main part of FIG.

[Explanation of symbols]

 1 Hoisting machine 2 Rotary encoder 3 Elevator control device 4 Abnormal vibration determination device 4a Speed detection device 4b Speed memory 4c Computing device 4d Both vibration memory 4e Judgment value generator 4f Vibration determination device 4g Abnormal vibration memory 5 Abnormal signal output device 6 Broadcast equipment in cage 7 Monitoring center

Front Page Continuation (72) Inventor Takaaki Oka 1-6 Kandanishikicho, Chiyoda-ku, Tokyo Within Hitachi Building System Service Co., Ltd. (72) Kenji Kono 1-6 Kandanishiki-cho, Chiyoda-ku, Tokyo Hitachi Ltd. In the building system service

Claims (2)

[Claims] 1. An abnormal vibration detection device for an elevator, which detects an artificial abnormal vibration generated in a car during steady running of the elevator, and a running speed measuring means for measuring the running speed of the car while the car is running. Between the time when the traveling speed fluctuation of the car during steady running of the elevator measured by the traveling speed measuring means is calculated, and the maximum value with respect to the time of the traveling speed is given and the subsequent maximum value is given. Of the vibration cycle as the vibration cycle, and the vibration cycle calculated by the vibration cycle calculation means is within a predetermined set cycle range, and within one cycle when the vibration cycle is calculated. The difference between the maximum value and the minimum value of the traveling speed with respect to time is the amplitude of both vibrations, and the amplitudes of both vibrations are compared with a predetermined reference amplitude, and the amplitudes of both vibrations are larger than the reference amplitude. An abnormal vibration detection device for an elevator, comprising: an abnormal vibration determination means for determining both of the vibrations for which the vibration cycle is obtained when the vibration cycle is determined to be an artificial abnormal vibration generated in a car. . 2. The traveling speed measuring means counts pulse signals within a predetermined short period output from a rotary encoder that outputs a pulse signal proportional to the number of rotations of a rotary shaft of an elevator hoisting machine. Claim 1 characterized by the above.
Abnormal vibration detection device for the elevator described.