Coaxial butt-joint tool of two sections of high-precision steel tubes in long-short ratio of being greater than 9

Abstract

The invention discloses a coaxial butt-joint tool of two high-precision steel tubes in long-short ratio of being greater than 9, and belongs to the technical field of special fixtures. The coaxial butt-joint tool comprises a support device, a lifting device and a coaxial alignment mechanism; the coaxial alignment mechanism comprises a base module, a front rocker module, and a back rocker module; four springs in the base module are contacted with a cushion block on the foundation, a telescopic power screw mechanism is hinged between middle parts of the front rocker module and the back rocker module; and when the coaxial butt-joint tool is in use, circular arc slots in the upper parts of the front rocker module and the back rocker module are cooperatively buckled at adjacent ends of a long steel tube and a short steel tube. An outer cylindrical surface of the fixed long steel tube is used as the reference, the coaxial alignment of the short steel tube and the long steel tube is realizedthrough the enclasping of the front rocker module and the back rocker module, so that the tool has the capacity of adapting to any location error; the coaxial alignment of the long steel tube and theshort steel tube can be easily realized since the short steel tube is lifted through an elastic force lifting way, thereby welding a drill stem with high coaxiality.

Description

technical field [0001] The patent of the invention relates to the technical field of mechanism and the special fixture for the manufacture of rotary drilling rigs, specifically a two-section high-precision steel pipe coaxial butt joint tool with a length ratio greater than 9. Background technique [0002] Rotary drilling rigs are hole-forming equipment in the construction of bridges, subways and buildings. The drilling depth is between 30m and 150m, and the number of drill pipe sections is 3 to 6. A drill pipe is welded by seamless steel pipe and other parts, and multiple drill pipes form the retractable drill pipe of the rotary drilling rig with an inner sleeve structure, and a group of outer key strips and pressurized lock tables are welded on the outer wall of the inner steel pipe , the inner wall of the outer steel pipe corresponds to the welded inner key bar, the outer key bar and the inner key bar make the inner steel pipe and the outer steel pipe form a moving pair an...

AI Technical Summary

Problems solved by technology

[0009] The fourth aspect is that there is a small deflection angle between the axis of the short steel pipe and the axis of the long steel pipe, which is difficult to be found;

[0010] The fifth aspect is that the axial length involved in the adjustment of the dial indicator is too small, and the characteristics of the limited points on the long steel pipe and the short steel pipe are used instead of the geometry of the arc surface on the long steel pipe and the short steel pipe. The accuracy of judging the coaxiality is low;

[0011] The problems in these five aspects lead to low docking accuracy. When the drilling rig rotates, the drill pipe generally appears shimmy phenomenon, which can be clearly observed on the construction site. Due to the low coaxiality accuracy, additional lateral force is generated, which is serious. At the time, the stress at the root of the square head part of the power head is too large and premature cracking occurs

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