Method and device for measuring radial deviation of metal tank

Abstract

The invention discloses a method and a device for measuring the radial deviation of a metal tank. According to the method, a wall climbing robot drags and carries an optical pentagonal prism, which can achieve a good optical reflection effect and is controlled by a corresponding electric control system to make the robot walk upwards and downwards along the bus direction of the metal tank wall and to automatically position the measurement points. An electronic total station is utilized to track the pentagonal prism so as to automatically perform range finding when the robot arrives at the various set measurement points and to realize radial deviation measurement with higher precision and wider applicability. The design of the invention is innovative and reasonable. Highly intelligent, the device works reliably and safely. The method and the device are completely suitable for occasions with explosions and dangers. Convenient and flexible to operate, the method and the device can reduce the labor intensity greatly, therefore, increasing the measurement efficiency. In addition, with the method and the device, the automation degree for radial deviation measurement of oil tank can be increased so as to better meet the requirements illustrated in the check regulations of JJG168-2005 Stand-up Metal Tank Capacity, therefore, making the method and the device of good prospects for wide promotions.

Description

technical field [0001] The invention belongs to the field of capacity measurement of large tanks, and relates to a method and a measuring device for measuring the radial deviation of metal tanks. Background technique [0002] According to the national measurement verification standard JJG168-2005 "Vertical Metal Tank Capacity", the capacity of large metal vertical oil tanks must be verified, and the verification includes the first verification, follow-up verification and verification in use. The first verification shall not exceed 2 years, and the subsequent verification shall not exceed 4 years. [0003] According to the calculation method determined by the verification regulations, the radius of the oil tank ring plate is a necessary parameter for the calculation of the oil tank capacity. Therefore, when the oil tank capacity is verified, the radius of all the ring plates of the oil tank must be determined. [0004] To measure the radius of the ring plate, you must first ...

AI Technical Summary

Problems solved by technology

The advantage of using the total station method is that it realizes automatic distance measurement and reading, and eliminates the subjectivity of manual reading, but the disadvantages still exist. First, because there is no mark on the tank wall, the same point may not be measured during round-trip measurement; second. The reason is that the ranging spot is small, and it is easily affected by the reflection and scattering of light by the small scattered pits on the tank wall, resulting in large measurement random errors; the third is that when the tank body is high, the incident angle of the ranging light is large, resulting in measurement errors become larger, which is unavoidable by the principle of optical ranging

To sum up, as a new technology for measuring the radial deviation of large vertical tanks, the total station has the advantages of labor saving and high efficiency, but there are also unavoidable shortcomings brought about by the measurement principle

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