CN102852461A - Core drilling drill with barrier crushing and chip-discharge functions - Google Patents

Abstract

A core drilling bit with crushing, barrier and chip removal functions, characterized in that it includes a drill bit base body, the drill bit base body is hollow cylindrical, the upper end is provided with a drill pipe connection part, and the lower end is retracted radially to form an isolation cutting ring. The convex table surface formed by retracting the body is an inclined plane, and a coring mechanism placement space is formed between the drill base body and the isolation cutting ring; the outer surface of the drill bit base is connected with an outer helix, and the outer surface of the isolation cutting ring and the inclined plane are connected with a uniform circumferential distribution. cutting tool; the large space near the cutting tool of this device is also beneficial to reduce the friction and heat between the cutting tool and the lunar soil, and the surface of the drill bit is hardened and smooth, which also greatly reduces the friction and heat; when drilling, it is broken, isolated, discharged The chip effect is good, and this structure can also solve the problem of friction and heat to a certain extent, which is suitable for drilling and sampling on the lunar surface.

Description

Drilling core bit with breakage barrier and chip removal function

technical field

The invention belongs to the field of aerospace, and relates to a drilling tool for drilling soil on the surface of the moon in the aerospace environment, in particular to a drilling core bit with the functions of breaking, blocking and chip removal.

Background technique

Aerospace is a frontier project for human beings to explore the natural world. Going into space has become an indispensable symbol of a scientific and technological power. The lunar exploration project is a relay stage of my country's aerospace industry. The results will provide valuable experience for the next step of outer space exploration. The lunar exploration project is mainly to reveal the mystery of the lunar environment through telemetry and remote sensing and the final moon landing. After the moon landing, a series of scientific research projects will be carried out on the moon. Each The links are very important, one of which is to obtain samples of lunar surface materials, which involves the research and development of lunar surface drilling tools. Due to the influence of the vacuum environment of the moon, the low thermal conductivity of the lunar soil and the inability to use cutting fluid to cool the drilling tool during the drilling process, the heat generated by the friction between the drill bit and the lunar soil cannot be dissipated during the drilling process, which will affect the breakage of the drilling tool. Footage efficiency and coring quality; and the structure of the lunar regolith is complex, the density of the lunar regolith cannot be determined with depth, the distribution of rocks in the surface layer of the regolith is random, and the interlaced particles of the lunar regolith have high mechanical strength, which will lead to severe wear of cutting tools during drilling , Fracture or falling off, drill pipe bending and deformation to cause drill sticking and other phenomena; and a coring mechanism must be installed inside the drill bit, so the existing core drilling tool structure must be redesigned to meet its special requirements.

Contents of the invention

In order to solve the above problems, the present invention provides a drilling core bit with the functions of breaking barrier and chip removal, which meets the requirements of the special environment of the moon, and can perform crushing, isolation and chip removal, so that the collection work can be carried out reliably.

The technical solution used in the present invention is a drilling core bit with the functions of breaking barrier and chip removal, which is characterized in that it includes a drill bit base body, which is hollow cylindrical, with a drill pipe connecting part at the upper end and radially retracted at the lower end An isolation cutting ring is formed, and the convex surface formed by retracting the drill base is an inclined plane, forming a coring mechanism placement space between the drill base and the isolation cutting ring; the outer surface of the drill base is connected with an outer helix, which is connected to the outer surface of the isolation cutting ring and The inclined plane is connected with cutting tools evenly distributed in the circumferential direction.

The lower edge of the cutting tool is flush with the lower edge of the isolation cutting ring.

The lower end of the isolating cutting ring is provided with circumcising teeth distributed in the circumferential direction, and the tip of the circumcising tooth is lower than the cutting tool downwards.

The annular cutting teeth extend through the inner surface of the spacer cutting ring to the inside thereof.

The outer helix has one end, and one of the cutting tools extends to the outer surface of the drill base to connect with the starting point of the outer helix.

The outer helix has two ends and four cutting tools, wherein the two non-adjacent cutting tools extend to the outer surface of the drill base and connect with the corresponding starting point of the outer helix.

The number of outer helical heads is equal to the number of cutting tools, and each cutting tool extends to the outer surface of the drill base to connect with the corresponding starting point of the outer helix.

Breaking protrusions are arranged between adjacent cutting tools on the slope, and the breaking protrusions are located inside the axially outwardly extending surface of the drill base body.

The outer diameter at the largest point of the cutting tool is greater than the outer diameter of the outer helix.

In the present invention, the lower end of the base body of the drill bit is retracted inside to form a space for installing the coring mechanism, and the isolation cutting ring formed at the lower part is used to circumscribe and isolate the inner and outer lunar soil, and the base body of the drill bit is connected to the isolation cutting ring. The formed convex platform is an inclined surface, which is used to guide the external lunar soil to discharge the drilling hole along the outer spiral, effectively reducing friction and heat generation, and the large space near the cutting tool is also conducive to reducing friction and heat generation with the lunar soil; when the device is drilling, it is broken, The isolation and debris removal effects are good, and this structure also solves the problem of friction and heat, and is suitable for lunar surface drilling and sampling.

Description of drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

The names of symbols in the figure: 1 drill bit base; 2 drill pipe connecting part; 3 isolation cutting ring; 4 slope;

Detailed ways

The embodiment of the present invention is shown in Fig. 1, the drilling core bit with crushing barrier and chip removal function is provided with a hollow cylindrical drill bit base 1, and its upper end is provided with a drill pipe connecting portion 2 for connecting with the drill pipe, The lower end is retracted radially to form an isolation cutting ring 3, and the convex surface formed by the retraction of the drill base 1 is an inclined plane 4. A coring mechanism placement space 5 is formed between the drill base 1 and the isolation cutting ring 3, which is used for arranging tubular cores. Core mechanism; the outer surface of the drill base 1 is connected with an outer helix 6, and the outer surface of the isolation cutting ring 3 and the inclined surface 4 are connected with cutting tools 7 evenly distributed in the circumferential direction, the outer helix 6 is connected with the cutting tool 7, and the lower edge of the cutting tool 7 is connected with the cutting tool 7. The lower end of the isolation cutting ring 3 is flush; the lower end of the isolation cutting ring 3 is provided with annular cutting teeth 8 distributed in the circumferential direction; when in use, the corresponding coring mechanism placement space 5 in the drill pipe and the drill bit base 1 is equipped with a coring packaging mechanism. The packaging mechanism is seamlessly matched with the upper part of the isolation cutting ring 3 to prevent debris from entering the lunar soil. When drilling, the drill pipe and the drill bit base 1 rotate, and the circumcision teeth 8 and the isolation cutting ring 3 perform circumcision and separation of the lunar soil. The lunar soil outside the isolation cutting ring 3 is broken under the action of the cutting tool 7, and enters the outer helix 6 along the guide groove formed by the outer surface of the isolation cutting ring, the inclined surface and the cutting tool 7 to exclude the drill hole, which can effectively reduce friction and heat; The lunar soil in the isolation cutting ring 3 enters the coring and packaging mechanism; the large space near the cutting tool of this device is also conducive to reducing the friction and heat between the cutting tool and the lunar soil, and the surface of the drill bit is hardened and smooth, which also greatly reduces friction Heat generation; the crushing, isolation, and chip removal effects are good during drilling. This structure can also solve the problem of friction and heat generation to a certain extent, and is suitable for lunar surface drilling and sampling.

When the present invention is implemented, the ring cutting teeth 8 can be extended to the inside through the inner surface of the isolation cutting ring 3, so that the diameter of the lunar soil entering the isolation cutting ring 3 is smaller than the inner diameter of the isolation cutting ring 3, which is conducive to reducing friction; Breaking protrusions are set between the adjacent cutting tools 7 on the 4, and the fragments removed from the external drilling holes are further broken during the rotary feeding, so as to avoid drill sticking and make chip removal smoother.

Claims (8)

1. A drilling core bit with functions of crushing barrier and chip removal, characterized in that it includes a drill bit base (1), the drill bit base (1) is hollow cylindrical, the upper end is provided with a drill pipe connecting part (2), and the lower end is Radial retraction forms the isolation cutting ring (3), and the convex surface formed by the retraction of the drill bit base (1) is an inclined plane (4). A coring mechanism is formed between the drill base body (1) and the isolation cutting ring (3). The placement space (5); the outer surface of the drill base body (1) is connected with an outer helix (6), and the outer surface of the isolation cutting ring (3) and the inclined surface (4) are connected with cutting tools (7) evenly distributed in the circumferential direction. 2. The drilling core bit with functions of crushing, barrier and chip removal according to claim 1, characterized in that the lower edge of the cutting tool (7) is flush with the lower edge of the isolation cutting ring (3). 3. The drilling core bit with crushing barrier and chip removal function according to claim 2, characterized in that the lower end of the isolating cutting ring (3) is provided with circumcising teeth (8) distributed in the circumferential direction, and the circumcising teeth ( 8) Point down below the cutter (7) According to claim 3, the drilling core bit with the functions of breaking, blocking and chip removal is characterized in that the circumcutting teeth (8) extend through the inner surface of the isolating cutting ring (3) to the inside thereof. 4. The drilling core bit with the functions of crushing, blocking and chip removal according to claim 1, characterized in that the outer helix (6) has one end, and one of the cutting tools (7) extends to the bit base (1 ) outer surface is connected with the starting point of the outer helix (6). 5. The drilling core bit with crushing barrier and chip removal function according to claim 1, characterized in that the outer helix (6) has two ends, and the cutting tool (7) has four ends, of which two non-adjacent A cutting tool (7) extends to the outer surface of the drill base body (1) and connects with the corresponding starting point of the outer helix (6). 6. The drilling core bit with crushing barrier and chip removal function according to claim 1, characterized in that the number of heads of the outer helix (6) is equal to the number of cutting tools (7), and each cutting tool (7) Both extend to the outer surface of the drill base body (1) and connect with the corresponding starting point of the outer helix (6). 7. The drilling core bit with crushing barrier and chip removal function according to claim 1, characterized in that crushing protrusions are arranged between adjacent cutting tools (7) on the slope (4), and the crushing protrusions are in the The interior of the axially outward extension of the bit base body (1). 8. The core drill bit for drilling with crushing barrier and chip removal functions according to claim 1, characterized in that the outer diameter of the cutting tool (7) at its maximum point is larger than the outer diameter of the outer helix (6).