Pure rolling supporting and cutting integrated reamer bit

Abstract

The invention discloses a pure rolling supporting and cutting integrated reamer bit, and relates to the technical field of pipeline crossing construction. The reamer bit comprises a reamer bit body and further comprises a plurality of cutting units; the cutting units are arranged in the circumferential direction of the reamer bit body; the cutting units are arranged on the reamer bit body in a double-fulcrum supporting mode; the reamer bit body comprises a mandrel; a cylinder is sleeved on the mandrel; an upper cover plate is arranged on one side of the cylinder; and a lower supporting plate is arranged on the other side of the cylinder. According to the pure rolling supporting and cutting integrated reamer bit, the multiple cutting units are directly arranged on the reamer bit body, so that the installation of a centralizer is omitted, and the reamer bit and the centralizer are combined into a whole; and sliding friction between a drilling tool and the bottom of a hole is changed into pure rolling, so that the overall weight of a reaming drilling tool combination and the jumping in the cutting process are reduced, torque is reduced, the cutting units are fixed on the reamer bit body in a double-fulcrum supporting mode, the stability is better, the service life of the cutting units is prolonged, and the production cost is saved.

Description

technical field [0001] The invention relates to the technical field of pipeline crossing construction, in particular to a pure rolling support cutting integrated reaming drill bit. Background technique [0002] Horizontal directional drilling rig is a construction machine for laying various underground utilities (pipelines, cables, etc.) without excavating the ground surface. Under construction. At present, during the reaming process of horizontal directional drilling rigs, centralizers are often connected to the front or rear end of the reamer, and the centralizers are generally barrel-type, roller-type, and cone-type. The reamer cannot avoid being connected with the reamer through a threaded thread. At the same time, installing centralizers before and after the reamer also increases the weight of the reaming drill assembly in the hole, making the drill tool jump greatly during the drilling process and the rotational torque Shaft breakage is one of the most taboo safety a...

AI Technical Summary

Problems solved by technology

[0004] The centralizer in the prior art is connected to the reamer through a threaded thread, and the threaded thread at the connection point is prone to single-point stress concentration and excessive fatigue after long-distance or long-term use, which will cause damage to the centralizer and shorten the service life. It is relatively low, needs to be replaced regularly, and the production cost is high. At the same time, installing a centralizer on the reamer increases the weight of the reamer bit, making the drill tool jump greatly during the drilling process, and the rotational torque is relatively increased. At this time If rockfall occurs in the hole, the drill bit jumps, the drill bit is stuck and other abnormal conditions will aggravate the damage of the thread until it breaks. In severe cases, the shaft will be broken, which will affect the normal use of the reaming drill.

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