JPH0579414U - Curvature radius measuring device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a curvature radius measuring device for a cable, which can easily and accurately measure the curvature radius of the cable. A cable bend measuring device comprising an angle sensor capable of detecting rotation on an arbitrary surface, a moving distance sensor, and an arithmetic unit for calculating a radius of curvature of a cable from outputs of the angle sensor and the moving distance sensor.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a cable radius of curvature measuring device.

[0002]

[Prior Art]

 As shown in FIG. 3 (a), when the cable 6 is laid in the pipe line 7, the cable 6 expands and contracts due to temperature change, so that the length changes and the change in length is absorbed. , It was necessary to have a certain bend at the joint.

Conventionally, the following method has been used to give a cable an appropriate bend.

First, an appropriate radius of curvature is calculated from the thickness of the cable and the length of the manhole. A plate or the like is processed according to the value. As shown in FIG. 3 (b), the manufactured plate 8 is placed along the cable 6 bent by a dedicated bender, and it is determined whether or not the radius of curvature of the cable is appropriate. If not, bend the cable again and measure the radius of curvature of the cable. Then, as shown in FIG. 3C, this operation is repeated until the cable 6 is sufficiently bent.

However, in the conventional method, it is necessary to separately manufacture the plates for different bends, and since there is a deviation between the laid cable and the manufactured plate, the final method is eventually produced. There is a drawback that the radius of curvature cannot be measured accurately.

[0006]

[Problems to be solved by the device]

 An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a cable radius-of-curvature measuring device capable of easily and accurately measuring the radius of curvature of a cable.

[0007]

[Means for Solving the Problems]

 The cable bend measuring device of the present invention comprises an angle sensor capable of detecting rotation on an arbitrary surface, a moving distance sensor, and an arithmetic unit for calculating the radius of curvature of the cable from the outputs of the angle sensor and the moving distance sensor. The radius of curvature of the cable can be measured easily and accurately.

[0008]

【Example】

 Hereinafter, one embodiment of the radius of curvature measuring device of the present invention will be further described with reference to the accompanying drawings.

As shown in FIG. 1, an angle sensor 1 capable of detecting rotation of a cable curvature radius measuring device on an arbitrary surface, a wheel 2, a rotary encoder 3 for converting the rotation of the wheel 2 into a pulse train, and a rotary encoder. It has a counter 4 for counting the output of 3 and an arithmetic unit 5 for calculating the radius of curvature of the cable from the output of the angle sensor 1 and the counter 4.

Then, this radius-of-curvature measuring device is moved in the longitudinal direction along the cable 6 as shown in FIG. At this time, the wheel 2 is brought into contact with the cable 6. When the moving distance of the device is 1 and the angle detected by the angle sensor is θ, the radius of curvature R can be obtained by R = 1 / θ−r where r is the radius of the cable.

In this embodiment, the moving distance of the device is detected by combining the rotary encoder 3 and the wheel 2, but other moving distance sensor may be used instead. Even in this case, the same effect can be obtained.

Further, as the angle sensor 1, an optical fiber gyro, a gas rate sensor, or the like can be used.

[0013]

As described above, according to the present invention, the cable bending measuring device is provided with an angle sensor capable of detecting rotation on an arbitrary surface, a wheel, a rotary encoder for converting the rotation of the wheel into a pulse train, and an output of the encoder. Since it has a counter that counts and a calculator that calculates the radius of curvature of the cable from the output of the angle sensor and the counter, it can measure the radius of curvature of the cable easily and accurately. The target value is great.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a radius-of-curvature device of the present invention.

FIG. 2 is an explanatory view showing how the radius of curvature is measured using the device of the present invention.

FIG. 3 is an explanatory view showing a state in which a cable is laid in a pipeline.

[Explanation of symbols]

 1 Angle Sensor 2 Wheels 3 Rotary Encoder 4 Counter 5 Computing Unit 6 Cable 7 Pipeline 8 Plate

Claims (1)

[Scope of utility model registration request] 1. An angle sensor capable of detecting rotation on an arbitrary surface, a movement distance sensor, and an arithmetic unit for calculating a curvature radius of a cable from an angle detected by the angle sensor and a detection distance of the movement distance sensor. A curvature radius measuring device for a cable, characterized in that