JPH07209109A - Tension measuring device - Google Patents

Abstract

PURPOSE:To enable exact control of tension to be performed by detecting the vibration of a plurality of wire ropes with vibration detection means and operating the tension based on the vibration detected with a tension operation means. CONSTITUTION:By hitting wire ropes l, 2 and 3 with a hammer 11, vibrations are caused on the wire ropes 1, 2 and 3 and resulting output signals of acceleration sensors 12, 13 and 14 are input. By counting the peaks in a specific time, the frequencies of wire ropes 1 to 3 are individually calculated. Then, by comparing and calculating the frequency values, the order of the frequency values is displayed. The reference range of the comparison judgement of the frequency values is set in advance with a comparison accuracy setter, and the order of the frequency is indicated on displays 21 to 23. Thus, by referring to the wire rope 1 in which the maximum of frequency, is measured, for example, nuts 9 and 10 of the wire ropes 2 and 3 are adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension measuring device for measuring and adjusting a tension difference between a plurality of wire ropes such as an elevator hoisting rope.

[0002]

2. Description of the Related Art A conventional tension measuring method will be described with reference to FIG. FIG. 5: is a figure which shows the method of confirming and adjusting the relative tension of three conventional wire ropes.

In FIG. 5, reference numerals 1, 2 and 3 denote wire ropes connected to the upper end of a weight or the upper end of an elevator car via a hoisting rope sheave, 4, 5, and 6, respectively.
Is a steel rope socket, 7 is a beam at the top of the elevator car or the top of the weight, 8, 9 and 1
Reference numeral 0 is a nut for fixing the wire ropes 1 to 3 to the beam 7. Further, 11 is a hammer for hitting the wire rope.

Next, the procedure for measuring and adjusting the tension of three conventional wire ropes will be described with reference to FIG.

Conventionally, the wire ropes 1 to 3 are hit, and the vibration period (several seconds to several tens of seconds) of the three wire ropes 1 to 3 and the difference between them are obtained by a hand feeling and a stopwatch.
The relative tension of the wire ropes 1 to 3 of the book was adjusted.

With the hammer 11, the wire ropes 1 to
Vibration is generated in the wire ropes 1 to 3 by sequentially hitting the wire ropes 3. This vibration cycle is the wire rope 1
Check by touching 3 and measure each with a stopwatch.

Since the wire rope having a shorter vibration cycle has a relatively higher tension, the tension of the wire ropes 1 to 3 is adjusted by tightening the wire rope having a lower tension with the nuts 8 to 10. Repeat this operation until the relative tension difference reaches the specified value.

For example, the wire rope 1 and the hammer 11
The hit is given and the stopwatch is started. Put your hand on the wire rope 1 and stop the above stopwatch when you feel that the vibration from the impact has returned from the sheave. If the time of the stopwatch is 1 second, the vibration cycle of the wire rope 1 is 1
Consider as seconds.

By the same procedure, the vibration periods of the wire ropes 2 and 3 were measured and were 2 seconds and 2.5 seconds, respectively. As a result, the wire rope 1 has the highest tension, and the tensions of the other wire ropes 2 and 3 are adjusted by the nuts 9 and 10 with the wire rope 1 as a reference rope.

Again, when the vibration period of the wire ropes 2 and 3 was measured by the stop watch,
It was 2 seconds and 1.5 seconds. The specified value of the relative tension difference is
For example, assuming that the tension of the reference rope is 20%, the tension of the wire rope 2 has entered the specified value, and the tension is readjusted by the nut 10 only for the wire rope 3,
The above procedure is repeated until the specified value is reached.

[0011]

In the conventional tension measuring method as described above, since the cycle of vibration of the wire ropes 1 to 3 is measured manually and by the stopwatch, the error and accuracy due to individual differences. However, there was a problem that the cycle of vibration was changed due to the lack of the cable and the difference in the length of the wire rope at each site, and a certain measurement accuracy could not be obtained. Further, there is a problem that it is necessary to repeat the measurement adjustment work independently, which requires a long time.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a tension measuring device capable of performing accurate tension adjustment and shortening the tension adjustment time.

[0013]

The tension measuring device according to claim 1 of the present invention comprises the following means. [1] Vibration detection means for detecting vibrations of a plurality of wire ropes of an elevator. [2] Tension calculating means for calculating the tension of the plurality of wire ropes based on the detected vibration. [3] Display means for displaying the magnitude relation of the tensions of the plurality of wire ropes.

A tension measuring device according to a second aspect of the present invention comprises the following means. [1] An acceleration sensor that detects vibrations of a plurality of wire ropes from a sheave to an upper end of an elevator car or a weight. [2] A frequency calculation unit that calculates the frequencies of the plurality of wire ropes based on the detected vibration. [3] A frequency magnitude comparison calculation unit that calculates the magnitude of the frequencies of the plurality of wire ropes. [4] A display unit that displays the magnitude relationship of the frequencies of the plurality of wire ropes.

[0015]

In the tension measuring device according to the first aspect of the present invention, the vibration detecting means detects the vibrations of the plurality of wire ropes of the elevator. Further, the tension calculation means calculates the tensions of the plurality of wire ropes based on the detected vibration. Then, the display means displays the magnitude relation of the tensions of the plurality of wire ropes.

In the tension measuring device according to the second aspect of the present invention, the vibration of the plurality of wire ropes from the sheave to the upper end of the elevator car or the weight is detected by the acceleration sensor. Further, the frequency calculator calculates the frequencies of the plurality of wire ropes based on the detected vibration. Further, the frequency magnitude comparison calculation unit calculates the magnitude of the frequencies of the plurality of wire ropes. Then, the display unit displays the magnitude relation of the frequencies of the plurality of wire ropes.

[0017]

【Example】

Example 1. The configuration of the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a schematic configuration of a first embodiment of the present invention, and a wire rope 1 to a hammer 11 to which reference numerals are sequentially assigned are the same as those of the conventional example described above. FIG. 2 is a diagram showing the internal configuration of the tension difference display device according to the first embodiment of the present invention. In each figure, the same reference numerals indicate the same or corresponding parts.

In FIG. 1, reference numerals 12, 13 and 14 are acceleration (vibration) sensors attached to the wire ropes 1 to 3 by magnets, and 15 is a tension difference display device connected to the acceleration sensors 12 to 14, 21, 22 and. Reference numeral 23 is a display provided on the tension difference display device 15 such as an LED or a liquid crystal. The acceleration sensors 12 to 14 are the rope sockets 4
It may be attached to the side of ~ 6.

In FIG. 2, 16 is an acceleration sensor 12 to.
An input unit including an interface connected to 14, 1
Reference numerals 7 and 18 denote a CPU, a ROM, a RAM, a program (software) registered in the ROM, a frequency calculation unit and a frequency magnitude comparison calculation unit including various data stored in the RAM, and 19 denotes a keyboard, a numeric keypad, and the like. Is a display unit including the display units 21 to 23, the display control unit, and the like.

By the way, in the vibration detecting means according to the first aspect of the present invention, the acceleration sensors 12 to 14 in the first embodiment.
The tension calculating means according to claim 1 of the present invention is the input section 16, the frequency calculating section 17,
The display means according to claim 1 of the present invention corresponds to the display section 20 in the first embodiment, which is composed of the frequency magnitude comparison calculation section 18 and the comparison accuracy setting section 19.

Next, the operation of the above-described first embodiment will be described with reference to FIG. FIG. 3 is a flowchart showing the operation of the first embodiment of the present invention.

Hammer 1 to wire ropes 1, 2 and 3
When the impact is given by 1, vibration is generated in the wire ropes 1 to 3, and the output signals of the acceleration sensors 12, 13 and 14 are input via the input unit 16 (step 30).

Next, the raw data of the acceleration sensors 12-14 is a sine wave corresponding to the vibration of the wire ropes 1-3,
The frequencies of the wire ropes 1 to 3 are calculated by counting the peaks within a predetermined time (step 31).

Next, the magnitude of the frequency is compared and calculated (step 32). In addition, frequency order and wire rope 1
The strengths of the tensions of to 3 are in the same order, and the wire rope having the highest frequency is the wire rope having the highest tension, and as a result, the strength of the tension is indirectly obtained.

Then, the order of magnitude of frequencies (tensions) is displayed (step 33). The reference range of the frequency comparison judgment is preset by the comparison accuracy setting unit 19, and if the frequency is within the reference range (for example, 20%), the frequencies are regarded as the same,
The order of frequency is displayed on the display devices 21 to 23.

For example, the measurement frequencies of the wire ropes 1, 2 and 3 are 1 Hz, 0.5 Hz and 0.4 Hz, respectively.
In the case of, as shown in FIG. 1, “1” is displayed on the indicator 21 of the wire rope 1, “2” is displayed on the indicator 22 of the wire rope 2, and “3” is displayed on the indicator 23 of the wire rope 3. It Using the wire rope 1 whose maximum frequency is measured as the reference rope, the nuts 9 of the wire ropes 2 and 3
And 10 are adjusted.

It should be noted that the vibration of the wire rope 1
3 to 3, the input unit 16 is provided with a function of invalidating the inputs from the acceleration sensors 12 to 14 in order to prevent the frequency from being displayed in descending order.

The adjustment work of the tension difference between the wire ropes 1 to 3 is performed according to the procedure shown in FIG. That is, first, the hammer 11 strikes the wire ropes 1 to 3 (step 40).

Next, the indicators 21 to 21 of the tension difference display device 15 will be described.
While checking the order of frequency shown in 23, the nuts 8 of the wire ropes 1 to 3 other than the highest rank are displayed.
By tightening 10, the work is ended when the display of the display devices 21 to 23 becomes the same in the order of magnitude. For example, the display ends when all of the displays on the display units 21 to 23 become “1”.

The first embodiment of the present invention, as described above,
The vibration frequencies of the three wire ropes 1 to 3 detected by the acceleration sensors 12 to 14 are calculated at the same time by the frequency calculation unit 17, and the frequency magnitude comparison calculation unit 18 and the display unit 20 are calculated.
As a result, the relative magnitude relationship of the tensions of the three wire ropes 1 to 3 is immediately displayed, so that the adjustment can be performed easily and accurately in a short time. In other words, the manual tension measurement is automated by using an acceleration sensor, a magnetic sensor, a metal sensor, or the like. In addition, the relative magnitude relationship of the tensions of a plurality of (three) wire ropes can be displayed immediately. Accurate measurement and adjustment is possible regardless of the wire rope length and measurement position. Further, since the measurement work and the adjustment work can be performed at the same time, the work can be performed in a short time.

Example 2. Although the work was performed in the elevator stopped state in the above-described first embodiment, in the case of the elevator hoisting rope, the same operational effect can be expected even if the tension of the wire rope is measured by utilizing the vibration of the elevator operation. The adjustment work of the tension difference is performed in a stopped state.

The main cause of the difference in tension between the wire ropes is the slip phenomenon between the sheave groove and the wire rope, which occurs due to variations in the wear of the hoisting rope sheave groove. Therefore, a change in tension of the wire rope over the reference range in a short period of time may be used for checking abnormal wear of the sheave groove.

Example 3. In the case of an elevator hoisting rope, the tension measuring device according to the first embodiment is permanently installed in the elevator to invalidate the input from the acceleration sensor depending on the magnitude of vibration that the device has as a basic function. If the wire rope receives more than 1.5 times the vibration of the normal operation at the site, it is judged that the elevator has an abnormality, and the signal is issued to the nearest floor to forcibly stop and suspend. May be output to the elevator side and used as a safety device.

Example 4. In addition to the third embodiment, an alarm device may be provided in the elevator, and when vibration above a certain level occurs in the wire rope, it may be determined that an abnormality has occurred in the elevator and an alarm may be issued outside. .

Example 5. In addition to the fourth embodiment, a telephone line may be used to issue an alarm to a remote center or the like.

[0036]

As described above, the tension measuring device according to the first aspect of the present invention detects the vibrations of the plurality of wire ropes of the elevator, and the plurality of the vibration detecting means based on the detected vibrations. Since the tension calculation means for calculating the tension of the wire rope and the display means for displaying the magnitude relation of the tensions of the plurality of wire ropes are provided, it is possible to solve the problems such as the error by the operator and the variation in the measurement due to the individual difference. Thus, the magnitude relation of the tension between the plurality of wire ropes can be displayed immediately, and the confirmation and adjustment work of the tension difference between the wire ropes can be performed accurately and in a short time.

As described above, the tension measuring device according to the second aspect of the present invention includes the acceleration sensor for detecting the vibration of the plurality of wire ropes from the sheave to the upper end of the elevator car or the weight, and the detected vibration. A frequency calculation unit that calculates the frequencies of the plurality of wire ropes based on the above, a frequency magnitude comparison calculation unit that calculates the magnitude of the frequencies of the plurality of wire ropes, and a magnitude relationship between the frequencies of the plurality of wire ropes are displayed. Since the display unit is provided, problems such as operator error and measurement variation due to individual differences can be solved, and the magnitude relationship between the tensions of multiple wire ropes can be displayed immediately, and the tension difference between the wire ropes can be displayed. It is possible to perform the confirmation adjustment work accurately and in a short time.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a tension difference display device according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of the tension difference display device in the first embodiment of the present invention.

FIG. 4 is a flowchart showing a measurement adjustment work according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a conventional tension measuring method.

[Explanation of symbols]

 1, 2, 3 Wire rope 8, 9, 10 Nut 11 Hammer 12, 13, 14 Acceleration sensor 15 Tension difference display device 17 Frequency calculator 18 Frequency magnitude comparison calculator 21, 22, 23 Indicator

Claims (2)

[Claims] 1. A vibration detecting means for detecting vibrations of a plurality of wire ropes of an elevator, a tension calculating means for calculating a tension of the plurality of wire ropes based on the detected vibrations, and a tension of the plurality of wire ropes. A tension measuring device comprising a display means for displaying the magnitude relation of. 2. An acceleration sensor for detecting vibrations of a plurality of wire ropes from a sheave to an upper end of an elevator car or a weight, a frequency calculator for calculating frequencies of the plurality of wire ropes based on the detected vibrations, A tension measuring device comprising: a frequency magnitude comparison calculation unit that calculates the magnitude of the frequencies of the plurality of wire ropes; and a display unit that displays the magnitude relation of the frequencies of the plurality of wire ropes.