阅读说明：本技术 电梯的悬吊体张力测定装置 (Elevator suspension tension measuring device ) 是由 关哲朗 福永宽 渡边清高 森川哲士 大野佳子 于 2018-03-02 设计创作，主要内容包括：得到一种能够减少测定结果中包含的误差的电梯的悬吊体张力测定装置。该电梯的悬吊体张力测定装置(6)具备：摄像装置(601),其设置于电梯的由绳索(1)支承的轿厢(2),对绳索(1)进行拍摄；波形提取部(602),其使用摄像装置(601)所拍摄的图像来提取绳索(1)的振动波形；分析部(603),其使用提取出的振动波形计算绳索(1)的振动频率；加速度传感器(604),其测定作用于摄像装置(601)的加速度；以及判定部(605),其使用加速度传感器(604)的测定结果来判定作用于摄像装置(601)的加速度是否超过预先设定的范围。(Provided is a device for measuring the tension of a suspended body of an elevator, which can reduce errors contained in the measurement results. The elevator suspension tension measuring device (6) comprises: an imaging device (601) which is provided to a car (2) of an elevator supported by a rope (1) and which images the rope (1); a waveform extraction unit (602) that extracts the vibration waveform of the rope (1) using an image captured by the imaging device (601); an analysis unit (603) that calculates the vibration frequency of the rope (1) using the extracted vibration waveform; an acceleration sensor (604) that measures acceleration acting on the imaging device (601); and a determination unit (605) that determines whether or not the acceleration acting on the imaging device (601) exceeds a preset range using the measurement result of the acceleration sensor (604).)

1. An elevator suspension body tension measuring device, comprising:

an imaging device which is provided in a car supported by a suspension body of an elevator and which images the suspension body;

a waveform extracting unit that extracts a vibration waveform of the suspension body using a plurality of images captured by the imaging device;

an analysis unit that calculates a vibration cycle of the suspension body or a vibration frequency of the suspension body using the extracted vibration waveform of the suspension body;

an acceleration sensor that measures an acceleration acting on the imaging device; and

and a determination unit that determines whether or not the acceleration acting on the imaging device exceeds a predetermined range using a measurement result of the acceleration sensor.

2. The device for measuring tension of a suspension of an elevator according to claim 1,

the waveform extraction unit extracts position information of the suspension body for each of a plurality of images captured by the imaging device in association with imaging time information, generates an interpolated waveform using the extracted position information of the suspension body and the imaging time information, and resamples the generated interpolated waveform at equal intervals to extract a vibration waveform of the suspension body.

3. The device for measuring tension of a suspension of an elevator according to claim 1,

the waveform extraction unit extracts position information of the suspension in association with imaging time information for each of a plurality of images captured by the imaging device, generates an interpolation waveform using the extracted position information of the suspension and the imaging time information, up-samples the generated interpolation waveform, and extracts a vibration waveform of the suspension.

4. The suspension body tension measuring device of an elevator according to any one of claims 1 to 3,

the analysis unit calculates a frequency spectrum by performing fourier transform on the extracted vibration waveform of the suspension, and calculates a vibration cycle of the suspension or a vibration frequency of the suspension using the calculated frequency spectrum.

5. The suspension body tension measuring device of an elevator according to any one of claims 1 to 3,

the analysis unit calculates a vibration period of the suspension body or a vibration frequency of the suspension body using the extracted autocorrelation function of the vibration waveform of the suspension body.

6. The suspension body tension measuring device of an elevator according to any one of claims 1 to 5,

the device for measuring the tension of the suspension body of the elevator further comprises an imaging device inclination angle measuring unit which measures the inclination angle of the imaging device relative to the gravity direction by using the measurement result of the acceleration sensor.

7. The suspension body tension measuring device of an elevator according to any one of claims 1 to 6,

the acceleration sensor measures an acceleration acting on the imaging device that performs periodic vibration.

8. The suspension body tension measuring device of an elevator according to any one of claims 1 to 7,

the acceleration sensor measures an acceleration acting on the imaging device that performs pulse vibration.

9. The suspension body tension measuring device of an elevator according to any one of claims 1 to 8,

the tension measuring device for the suspension body of the elevator further comprises a mark storage part for storing the mark mounted on the suspension body,

the camera device photographs the mark as a photograph of the suspended body.

10. The device for measuring the tension of a suspension of an elevator according to claim 9,

the mark stored in the mark storage unit is a pattern composed of two colors of black and white.

11. The device for measuring the tension of a suspension of an elevator according to claim 9 or 10,

the mark storage unit stores a plurality of marks corresponding to the plurality of suspension bodies, respectively.

Technical Field

The present invention relates to a suspension tension measuring device for an elevator, which photographs a suspension of the elevator by an imaging device.

Background

Conventionally, there is known an elevator suspension tension measuring device including: an imaging device which is provided in a car supported by a rope and which images the rope; and an image analysis device that calculates the vibration frequency of the rope using an image captured by the imaging device, and the suspension body tension measurement device for an elevator measures the tension of the rope using the calculated vibration frequency of the rope (see, for example, patent document 1).

Disclosure of Invention

Problems to be solved by the invention

However, when the car shakes, the imaging device shakes together with the car. As a result, the vibration frequency of the rope calculated by the image analysis device includes a large error. As a result, there is a problem that the measurement result of the suspension tension measuring device of the elevator includes a large error.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a suspension tension measuring device for an elevator, which can reduce errors included in measurement results.

Means for solving the problems

The elevator suspension tension measuring device of the invention comprises: an imaging device which is provided in a car supported by a suspension body of an elevator and which images the suspension body; a waveform extraction unit that extracts a vibration waveform of the suspension body using a plurality of images captured by the imaging device; an analysis unit that calculates a vibration cycle of the suspension body or a vibration frequency of the suspension body using the extracted vibration waveform of the suspension body; an acceleration sensor that measures acceleration acting on the imaging device; and a determination unit that determines whether or not the acceleration acting on the imaging device exceeds a predetermined range using a measurement result of the acceleration sensor.

Effects of the invention

According to the elevator suspension tension measuring device of the present invention, the acceleration sensor measures the acceleration acting on the imaging device, and the determination unit determines whether the acceleration acting on the imaging device exceeds a predetermined range. Thus, when the acceleration acting on the imaging device exceeds a predetermined range, the measurement of the suspension tension by the suspension tension measuring device of the elevator can be stopped. As a result, errors included in the measurement result of the suspension tension measuring device of the elevator can be reduced.

Drawings

Fig. 1 is a side view showing an elevator provided with a suspension tension measuring device for an elevator according to embodiment 1 of the present invention.

Fig. 2 is a configuration diagram showing a suspension tension measuring device of the elevator shown in fig. 1.

Fig. 3 is a diagram showing a variation of the display portion of fig. 2.

Fig. 4 is a diagram showing a variation of the display portion of fig. 2.

Fig. 5 is a side view of the elevator showing the car of fig. 1 vibrating.

Fig. 6 is a configuration diagram showing an elevator suspension tension measuring apparatus according to embodiment 2 of the present invention.

Fig. 7 is a diagram showing the display portion of fig. 6.

Fig. 8 is a diagram showing the display unit when the imaging device is tilted with respect to the direction of gravity.

Fig. 9 is a configuration diagram showing an elevator suspension tension measuring apparatus according to embodiment 3 of the present invention.

Fig. 10 is a diagram illustrating the display portion of fig. 9.

Fig. 11 is a diagram showing a variation of the display portion of fig. 10.

Detailed Description