Online automatic measurement device and method of pipe diameter of spiral welding pipe

Abstract

The invention discloses an online automatic measurement device and method of the pipe diameter of a spiral welding pipe. The device comprises a point laser sensor (1), a sensor installation seat (2), a rotation shaft (3), an electric sliding ring (4), a force bearing support seat (5), a shaft coupling (6), a direct-current motor (7), an electric displacement bench (8), a displacement bench sliding block (9), a displacement bench driving motor (10) and a suspension arm (11). During measurement, the point laser sensor (1) stretches into the spiral welding pipe, and the rotation shaft (3) is driven to rotate by the direct-current motor (7) to drive the point laser sensor (1) to continue rotating, thereby finishing online automatic measurement of the inner diameter of the pipe diameter of the spiral welding pipe. By processing acquisition data of the point laser sensor (1), the inner diameter and the ovality of the spiral welding pipe are obtained, i.e., through coordinate conversion, measurement data of the point laser sensor is converted into a rectangular coordinate, and by using a least square algorithm to carry out fitting, the diameter of a circle is obtained. Meanwhile, by solving intersection points of connection lines of data points and a circle center and the circle, and solving the distance between two intersection points, the ovality of the spiral welding pipe is obtained.

Description

technical field [0001] The invention belongs to the technical field of diameter measurement of spiral welded pipes, and relates to an online automatic measurement device and method for diameters of spiral welded pipes. Background technique [0002] In the production of spiral welded pipe, the diameter of the steel pipe needs to be measured in real time to ensure product quality. At present, the commonly used measurement method is to rely on manual use of steel tapes and use the perimeter method to measure. Although this measurement method meets the standard requirements, on the one hand, the manual measurement is affected by the personal factors of the surveyor, and the measurement error is relatively large; on the other hand, due to the lag of manual measurement, the development trend of the pipe diameter cannot be grasped in time Usually, it can only be found through measurement after the diameter of the pipe has changed significantly, resulting in a lag in adjustment, an...

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Problems solved by technology

Although this measurement method meets the standard requirements, on the one hand, the manual measurement is affected by the personal factors of the surveyor, and the measurement error is relatively large; on the other hand, due to the lag of manual measurement, the development trend of the pipe diameter cannot be grasped in time Usually, it can only be found through measurement after the diameter of the pipe has changed significantly, resulting in a lag in adjustment, and it is very easy to cause the steel pipe to be discarded or downgraded due to the pipe diameter exceeding the standard. The most important thing is that the pipe diameter cannot be measured online, and the quality of the welded pipe cannot be monitored in real time.

[0003] With the development of pipeline construction, the requirements for the diameter of steel pipes in actual operations are becoming more and more stringent. The traditional measurement methods are gradually unable to meet the requirements of actual control due to reasons such as less measurement frequency and large human errors.

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