A method and system for calibrating and detecting the hook position of a vertical shaft drilling rig

Abstract

The invention provides a position calibrated detection method and system for a large hook of a spindle type drilling machine. A transmission gear transmits the angular velocity to an absolute value encoder, the absolute value encoder carries out counting, and data is then transmitted to a processing unit to calculate the position of the large hook. The transmission gear is connected with the absolute value encoder via a transmission shaft, the angular velocity and the angular displacement of the transmission gear are the same with those of the absolute value encoder, it is ensured that the transmission gear is engaged with an internal gear at one side of a winch of the spindle type drilling machine, and it is ensured that the die number of the transmission gear is the same with that of the internal gear. Position change of the large hook of the drilling machine is realized by a haulage cable of the winch, so that the rotation angular displacement of the winch is in one to one correspondence with the position of the large hook, and the position of the large hook can be calculated by recording the rotation angular displacement of the winch. Key idea of the detection system and method is segment interpolation, the layer change layer of the cable is selected as the key node to record the present value of the absolute value encoder and the height of the large hook, and the height of the large hook can be directly calculated by utilizing the linear relation between the large hook height and the encoded value in each layer.

Description

technical field [0001] The invention relates to a method and system for calibrating and detecting the hook position of a vertical shaft drilling rig, and belongs to the field of electromechanical integration. Background technique [0002] During the drilling operation, the hook height is a very important working parameter, which plays an important role in correctly calculating the drilling footage and ensuring the safety of the tripping operation. Due to the large variation range of the hook height (that is, the large measuring range), at the same time, the drilling operation requires its measurement accuracy to be high (the error can reach mm level). [0003] There are no more than two traditional measurement methods. The first one is to install a complex mechanical measuring mechanism on the reel shaft, and use the circumference count of the thin steel wire rope on the measuring mechanism to achieve height detection. The diameter is small, and the circumference error of d...

AI Technical Summary

Problems solved by technology

[0003] There are no more than two traditional measurement methods. The first one is to install a complex mechanical measuring mechanism on the drum shaft, and use the circumference count of the thin steel wire rope on the measuring mechanism to achieve height detection. The diameter is small, and the circumference error of different winding layers is ignored, so the structure of this method is complex and the precision is not high; Measuring the length of the steel wire rope through the length of the passing wire, thus calculating the height of the hook

In principle, the second method seems to have high measurement accuracy, but this method ignores the relative slippage between the guide wheel and the wire rope, and the slippage is affected by the load of the wire rope, the state of wear, and the adhesion of the wire rope. The medium (such as butter, mud, etc.) has great influence, and the slippage has great uncertainty, so the accuracy of this detection method cannot be guaranteed

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