Cylindrical drill bit fishing device and construction method thereof

Abstract

The invention discloses a cylindrical drill bit fishing device and a construction method thereof, and relates to the technical field of fishing devices. The technical problems that it is difficult fora lifting hook to accurately hook a drill bit in a dim pile hole, and often much time is spent are aimed to be solved, according to the main point of the technical scheme, the cylindrical drill bit fishing device comprises a connecting drill pipe, a cylinder is arranged on the end part of the connecting drill pipe, a flange device which is in detachable connection with the connection drill pipe is arranged at the top of the cylinder, a circular steel plate is connected to the inner side wall of the end, away from the direction of the connecting drill pipe, of the cylinder, a plurality of movable limiting devices are arranged at the end, close to the direction of the connecting drill pipe, of the circular steel plate, and a guiding device is arranged on the inner side wall at the other endof the circular steel plate. The effect of reducing the occurrence of the situation that fishing work time of an operator is long because it is difficult for the fishing device to accurately hook thedrill bit by the lifting hook is achieved.

Description

technical field [0001] The invention relates to a fishing device, more specifically, it relates to a cylindrical drill bit fishing device and a construction method. Background technique [0002] Drill bit catcher is a pile foundation in the drilling construction, when the drill bit is subjected to great resistance, due to the high torque of the high-power drilling rig, the connecting bolt of the drill bit flange is broken, and the drill bit falls to the bottom of the hole; at this time, the drill bit catches the falling The bottom drill bit was fished out. [0003] The existing Chinese patent with authorized notification number CN203114224U provides an engineering drill overshot, including a pull rod, which end of the pull rod is connected to the lifting lug, and a connecting through hole is arranged on the lifting lug, and the pull rod is arranged on the outer cylindrical surface near the lower end. There are several hooks; the drill bits that fall off are hooked by the ho...

AI Technical Summary

Problems solved by technology

[0004] However, ordinary overhaulers usually use a hook connected to the drill pipe to salvage. It is difficult to accurately hook the hook to the drill bit in the dark pile hole, and it often takes a lot of time, and the success rate of the final salvage process is low. Therefore, there is room for improvement

Images