Impactor piston auxiliary mounting device

Abstract

The invention relates to an impactor piston auxiliary installation device which comprises an expansion sleeve and a pulling assembly; the pulling assembly comprises a pull rod; the outer wall of the pull rod is sleeved with the expansion sleeve; and the pull rod can move up and down in the axis direction of a piston, so that the expansion sleeve has a first state that the outer diameter of the expansion sleeve is increased, and the expansion sleeve is in expansion fit with the inner diameter of the piston, and a second state that the outer diameter of the expansion sleeve is reduced, and the expansion sleeve is separated from the piston. According to the impactor piston auxiliary installation device, during assembling, the piston cannot apply large impact force to an outer cylinder; friction with the inner wall of the outer cylinder is avoided; and an inner hole of the outer cylinder cannot be scratched.

Description

technical field [0001] The invention relates to the technical field of impactor manufacturing, in particular to an auxiliary installation device for an impactor piston. Background technique [0002] With the advancement of science and technology, people began to develop resources in many ways. There are many mineral resources and energy hidden in the ground, so it involves many drilling projects, such as water wells, geothermal wells, salt wells, etc. At present, the most commonly used is the drill bit. Advancement, the drill bit is drilled by impact crushing and shearing to break the rock. It is characterized by high drilling efficiency and a wide range of applications. When the drill bit is working, the teeth touch the bottom of the well alternately, the rock-breaking torque is small, the contact area between the teeth and the bottom of the well is small, and it is easy to penetrate into the formation. Therefore, the roller cone bit can adapt to various formations from sof...

AI Technical Summary

Problems solved by technology

[0004] In order to improve the impact performance of the entire impactor, the overall length of the impactor (that is, the hole depth of the outer cylinder) is usually increased, generally set to 0.8m ~ 1.5m, in order to maintain the pressure inside the impactor at a high level, Usually, the gap between the outer cylinder and the piston is controlled between 0.1 and 0.2 mm. If the gap is too large, there will be pressure regulation, the piston will be weak in impact, and the drilling efficiency of the entire impactor will be low.

[0005] During the assembly process of the impactor, the piston needs to be moved to the step position at the bottom of the outer cylinder. Since the outer diameter of the piston is only 0.1-0.2mm less than the inner diameter of the outer cylinder, the self-weight is heavy. If the piston is allowed to fall directly by gravity 0.8 m ~ 1.5m, falling into the bottom step of the outer cylinder, on the one hand, it will cause a large impact on the outer cylinder, and on the other hand, the piston is easy to rub against the inner wall of the outer cylinder, and then scratch the inner hole of the outer cylinder

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