Novel adjustable type underreaming drill bit used for well

Abstract

The invention provides a novel adjustable type underreaming drill bit used for a well. The drill bit includes a lifting main body, an underreaming wing main body, a bottom plate, a central positioningshaft and a limit main body; the central positioning shaft is coaxially sleeved by the lifting main body; one end of the underreaming wing main body is hinged to the lower side of the lifting main body, and the other end of the underreaming wing main body is hinged to the upper surface of the bottom plate; the lower end of the central positioning shaft vertically and coaxially penetrates throughthe bottom plate; the lower end of the central positioning shaft is coaxially provided with an inserting tip; and the limit main body vertically passes through the lifting main body. By adoption of the underreaming drill bit, the novel adjustable type underreaming drill bit can meet hole expanding requirements of drilling hole diameters of various specifications, enables a work progress of a continuous hole expanding operation to be shortened, enables the service life of the entire underreaming drill bit to be prolonged, and can ensure a good accurate opening angle of an underreaming wing to improve the hole expanding quality and effectively avoid cost loss.

Description

technical field [0001] The invention relates to the technical field of auxiliary parts of mechanical equipment for drilling, in particular to a new type of adjustable bottom reaming drill bit for wells. Background technique [0002] The bottom reaming bored pile is formed on the basis of the bored pile, when the hole is formed at the bottom of the pile, the reaming drilling tool is replaced, and then during the drilling process, the reaming tool of the drilling tool is used to expand the hole. The bottom end of the pile is enlarged, so that the pullout resistance and compression resistance of the pile foundation are significantly improved. Most of the reaming drill bits adopt a connecting rod slider mechanism, and the reaming wing is opened at the bottom of the hole by the self-weight or pressure of the drill bit to realize reaming. Bottom reaming drill bit can be divided into mechanical type and hydraulic type according to different power types. But existing bottom expans...

AI Technical Summary

Problems solved by technology

[0003] 1. In order to save production costs, most bottom reaming drill bits often use the form of a limit hole and a stop pin to control the opening angle of the bottom expansion wing, so as to realize the reaming requirements of different specifications. However, this method is limited The position hole is not only easy to be blocked during reaming, which affects the continuous reaming operation process and increases labor intensity, but also the limit hole will also suffer from erosion and wear during the long-term working process of the reaming bit, which reduces the impact of the limit pin on the bottom expansion. Precise control of wing opening angle, resulting in shortened service life of the entire bottom reaming bit

[0004] 2. At present, although the bottom of the reaming drill bit is equipped with a corresponding base plate to realize the connection of its multiple reaming wings, at the same time, it ensures that the whole is in contact with the bottom of the hole when it enters the hole to be reamed and assists in completing the angle adjustment of the reaming wings. However, in the adjustment process, it is still difficult to avoid the deviation of the opening angle of the bottom expansion wing due to factors such as pressure or vibration, thereby reducing the quality of the expansion hole and causing waste of cost, etc.

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