A kind of inner and outer diameter measuring instrument and inner and outer diameter measuring method of circular tube
A measurement method, a technology of inner and outer diameters, applied in the field of measurement, can solve the problems of only measuring the outer diameter, small applicable surface, and only measuring the inner diameter, etc.
Active Publication Date: 2018-10-12
浙江华东科技检测有限公司
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Problems solved by technology
[0002] At present, the measurement techniques for the inner and outer diameters of round pipes mainly include tools such as π rulers, vernier calipers, and inner diameter measuring rulers. However, for round pipes with large diameters, this type of measurement method is often inconvenient to operate. The one-handed site is more difficult to complete; although some equipment can be operated with one hand, it can only measure the outer diameter or the inner diameter, and the applicable area is small
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[0022] The present invention will be further described below in conjunction with accompanying drawing.
[0023] Such as figure 1 As shown, the round pipe inner and outer diameter measuring instrument of the present invention mainly utilizes three points to determine the inner and outer diameter of the circle to measure the round pipe, and the main principles are as follows:
[0024] 1. There are three points on the fixed circle, and the distance between the three points is equal;
[0025] 2. Determine the length of L, which is half of the chord length;
[0026] 3. Determine the angle a, which is half of the angle between the lengths of the two chords;
[0027] 4. Determine the radius R=L / cos(a).
[0028] Such as figure 2 As shown, the round pipe inner and outer diameter measuring instrument of the present invention includes three rollers 1, two measuring arms 2 and an angular displacement sensor 3, the two measuring arms 2 are rotatably connected, and one of the rollers 1...
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The invention discloses an instrument for measuring the inner and outer diameters of a circular pipe. The instrument comprises three rollers, two measurement arms and an angular displacement sensor. The two measurement arms can be rotatably connected, and one of the rollers is arranged at the connection position. The other two rollers are arranged on outer ends of the two measurement arms respectively, and the rollers are fixed to the measurement arms through wheel shafts and can roll. The distances between wheel shaft holes of the two measurement arms are equal. The invention also discloses a method for measuring the inner and outer diameters of a circular pipe. The instrument and the method can be widely applied to measurement of the inner and outer diameters of large-diameter circular pipes in need of operation high above the ground, one-handed operation, or site restricted area, such as round iron towers, large-diameter oil or gas transmission pipelines lying on the ground, underground pipe networks, and the like.
Description
technical field [0001] The invention relates to the field of measurement, in particular to an instrument for measuring inner and outer diameters of circular pipes. Background technique [0002] At present, the measurement techniques for the inner and outer diameters of round pipes mainly include tools such as π rulers, vernier calipers, and inner diameter measuring rulers. It is more difficult to complete the site with one-handed operation; although some equipment can be operated with one hand, it can only measure the outer diameter or the inner diameter, and the applicable surface is small. Contents of the invention [0003] In order to solve the above-mentioned technical problems existing in the prior art, the present invention provides a round pipe inner and outer diameter measuring instrument, which includes three rollers, two measuring arms and angular displacement sensors, the two measuring arms are rotatably connected, and the joint One of the rollers is provided, ...
Claims
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IPC IPC(8): G01B21/10G01B21/14
CPCG01B21/10G01B21/14
Inventor 潘月辉李建伟杨海斌
Owner 浙江华东科技检测有限公司