Variable diameter drill by varying pushing force

A technology of thrust and drill body, which is applied in the field of drilling tools and drilling tools, and can solve problems such as the inability to achieve stable positioning of movable drill bits

Inactive Publication Date: 2014-02-26

HENAN POLYTECHNIC UNIV

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AI-Extracted Technical Summary

Problems solved by technology

Therefore, this solution cannot achieve the func...

Abstract

The invention discloses a variable diameter drill by varying pushing force. The variable diameter drill comprises an outer drill rod, an inner drill rod, a fixed drill bit and a movable drill bit, an outer locking sleeve and an inner locking sleeve are sleeved on the inner side of an outer sleeve, and abutting ends of the outer locking sleeve and the inner locking sleeve are provided with matched and meshed bevel gears, guide grooves and a pressure spring. A drill tool can be unfolded or folded by varying the pushing force applied to the drill rods, and can be stable under the action of the pressure spring after folded and by being fixed through a locking mechanism after unfolded, so that the external diameter of the drill tool can be expanded at any time.

Application Domain

Drill bits

Technology Topic

Drill bitDrill pipe +2

Image

Examples

Experimental program(2)

Example Embodiment

[0016] Example 1: A reducing drill that relies on changing thrust, see figure 1 , The outer drill rod 1 and the inner drill rod 2 are nested with each other, and a structure that can only slide axially is provided between the two, such as spline fitting, or a concave groove that matches the guide rib 10 is provided on the outer side wall of the inner casing. groove.

[0017] A fixed drill bit 3 is installed at the front end of the inner drill rod 2, and a movable drill bit is arranged between the outer drill rod 1 and the inner drill rod 2.

[0018] figure 1 Among them, the movable drill bit includes multiple sets of drill body one 4a and drill body two 4b, and supports 12a and 12b are fixed on the outer side of the outer drill rod 1 and the inner drill rod 2, respectively. The ends of each set of drill body one 4a and drill body two 4b are hinged on the supports 12a and 12b through pins, respectively. The other ends of each drill body 4a and drill body 2 4b are hinged together by a pin.

[0019] See figure 1 with figure 2 , An outer lock sleeve 8a and an inner lock sleeve 8b are sleeved on the inner side of the outer drill rod 1. The mating ends of the outer lock sleeve 8a and the inner lock sleeve 8b are provided with matching and mutually meshing bevel teeth 11; at the same time, the outer lock sleeve 8a and the inner lock sleeve Guide grooves 9a and 9b are evenly distributed on the outer surface of 8b, and guide ribs 10 are provided on the inner wall of the outer sleeve 1 to cooperate with the guide grooves 9a and 9b; the number of guide grooves 9a and 9b is half of the number of bevel teeth 11; A pressure spring 7 is installed on the outer side of the outer lock sleeve 8a, and a stop 6 located on the inner wall of the outer sleeve 1 is provided on the outer side of the pressure spring 7.

[0020] See image 3 or Figure 4 , The support 12a or 12b adopts a uniformly distributed single-hole support or a multi-hole support, and the ends of the drill body one 4a and the drill body two 4b are clamped by the support and press-fitted to improve the support strength.

Example Embodiment

[0021] Example 2: Another variable diameter drill that relies on changing thrust. The drawings are not drawn. The content is basically the same as the embodiment. The similarities are not repeated. The difference is: the inner drill rod is located at the rear end and the outer drill rod is located at the front end , The fixed drill rod is set at the end of the outer drill rod.

PUM

Description & Claims & Application Information

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