Power reaming device

Abstract

The invention discloses a power reaming device, which comprises a screw motor, a reamer and a sprayer; the screw motor comprises a rotor and a stator sheathing the rotor; the reamer sheathes the stator; the rotor is used for driving the reamer to rotate on the stator. As the reamer of the power reaming device disclosed by the invention is arranged on the stator of the screw motor, the power reaming device is compact in structure, and the rigidity and the strength of the power reaming device in the aspect of rotation are higher, and therefore bigger power (i.e., torsional moment) can be provided for the reamer by the power reaming device; compared with a reaming tool that the screw motor and the reamer are connected through a transmission shaft in the prior art, the power reaming device disclosed by the invention can be used for enlarging holes with larger diameters.

Description

technical field [0001] The invention relates to a power reaming device, which belongs to the field of non-excavation technology. Background technique [0002] At present, in the non-excavation field, when the diameter of the reaming is 100mm or larger, the drilling rig is usually used to provide power to drive the drill pipe and the reamer to complete the reaming, because there is a lot of friction between the drill pipe and the hole when it rotates. Most of the power provided by the drilling rig is used for the consumption of the drill pipe rotation, and only a small part is used for reaming with the reamer, so the effective power of this reaming method is low. In order to solve the problem of power consumption of drill pipe rotation, a reaming tool has appeared in the prior art. The reaming tool uses a hydraulic pump to drive a screw motor to drive the reamer to rotate to achieve reaming. The reaming tool mainly includes: screw Motor, transmission shaft and reamer, the ro...

AI Technical Summary

Problems solved by technology

[0002] At present, in the non-excavation field, when the diameter of the reaming is 100mm or larger, the drilling rig is usually used to provide power to drive the drill pipe and the reamer to complete the reaming, because there is a lot of friction between the drill pipe and the hole when it rotates. Most of the power provided by the drilling rig is used for the consumption of the drill pipe rotation, and only a small part is used for reaming the hole, so the effective power of this reaming method is low

In order to solve the problem of power consumption of drill pipe rotation, a reaming tool has appeared in the prior art. The reaming tool uses a hydraulic pump to drive a screw motor to drive the reamer to rotate to achieve reaming. The reaming tool mainly includes: screw Motor, transmission shaft and reamer, the rotor of the screw motor is connected with the reamer through the transmission shaft; the drilling fluid discharged from the hydraulic pump enters the spiral formed between the stator and the rotor through the liquid inlet port of the screw motor at a relatively high pressure. The drilling fluid flows out from the liquid outlet of the screw motor at a relatively low pressure, and the drilling fluid drives the rotor to rotate through the pressure difference formed by the drilling fluid, and the rotor drives the reamer to rotate through the transmission shaft to achieve reaming. In this reaming tool Only the reamer is rotating, and the energy (or work) consumed is basically only used for reaming. Therefore, the problem of power consumption of the drill pipe rotating when the reamer is used to drive the reamer is solved.

However, the transmission shaft in the reaming tool is flexibly connected to the screw motor and the reamer, and the structure is not compact because the transmission shaft has a certain length. Fracture occurs, therefore, the reaming tool is not strong enough to provide high torque to the reamer to enlarge larger diameter holes

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