Wheel type drilling depth measuring instrument and drilling depth measuring method

Abstract

The invention discloses a wheel type drilling depth measurement instrument and a drilling depth measurement method. A wheel type depth measurement device of the measurement instrument comprises a fixed frame, a wheel frame rotatably assembled on the fixed frame and a rotating wheel rotatably assembled on the wheel frame, the rotating axis of the rotating wheel is perpendicular to the rotating axis of the wheel frame, a set eccentric distance exists between the rotating axis of the rotating wheel and the rotating axis of the wheel frame, the rotating wheel is attached to a drilling rod in a press fit mode, and it is guaranteed that the rotating axis of the wheel frame perpendicularly crosses with the axis of the drilling rod. When the drilling rod works, an angle sensor is used for collecting the rotating angle signals of the wheel frame, a displacement sensor is used for collecting the rotating displacement signals of the rotating wheel, the spread length delta L of a spiral line, rotating along with the drilling rod, of the rotating wheel in a set time frame and the included angle alpha of the axis of the rotating wheel and the axis of the drilling rod in the time frame are obtained in a conversion mode, and a drilling depth L is calculated through the formula that L=delta L*sin alpha. The collecting mode of a fixed-axis rotating wheel in the prior art is abandoned in the drilling depth measurement method, and the bad influence of the rotating action force of the drilling rod in the measurement process can be obviously reduced.

Description

technical field [0001] The invention relates to a drilling depth measuring method and a measuring instrument. Background technique [0002] The drill rod used for drilling both rotates around its axis and moves along its axis during the drilling process, so it is difficult to directly measure the drilling displacement of the drill rod using a displacement sensor. CN202325482U Chinese patent discloses a drilling depth measurement device, which adopts a wear-resistant ball close to the drill pipe, and utilizes the horizontal measurement of the rotation axis perpendicular to the drilling direction to press the friction fit between the cylinder and the rolling ball The rolling amount of the ball in the drilling direction is reflected as the directional rotation of the cylinder, and then the rotation amount of the cylinder is collected by the rotation counter to calculate the drilling depth of the drill pipe. Since the particle on the outer surface of the drill pipe actually mov...

AI Technical Summary

Problems solved by technology

Since the particle on the outer surface of the drill pipe actually moves in a helical line during the drilling process, the rotating body (cylinder) of this type of measuring instrument in the prior art that outputs the directional rotation amount cannot avoid being subject to the force in the direction of the drill pipe rotation. The force will cause the rotating body to be subjected to deflection torques with irregular directions and sizes, making it difficult to ensure the stability of the axis. In addition to factors such as the manufacturing accuracy of the rotating body and fatigue wear, the measurement accuracy and accuracy of this type of measuring instrument in the prior art The service life is relatively poor

Images