CN115012842A

CN115012842A - High-wear-resistance core tube and drill bit structure and manufacturing method

Info

Publication number: CN115012842A
Application number: CN202210818507.2A
Authority: CN
Inventors: 杨辉武
Original assignee: Yongzhou Jinke Geological Equipment Co ltd
Current assignee: Yongzhou Jinke Geological Equipment Co ltd
Priority date: 2022-07-13
Filing date: 2022-07-13
Publication date: 2022-09-06

Abstract

The invention discloses a high-wear-resistance core tube and drill bit structure and a manufacturing method thereof, wherein the manufacturing method comprises the following steps: a core barrel for providing drilling support; the end heads are arranged at two ends of the core tube and are welded and fixed on the core tube; the drill bit is arranged in the end head through threads; the connecting section is arranged between the adjacent core pipes and is connected with the core pipes through threads; and the water tank is arranged on the outer walls of the core tube, the drill bit and the connecting section. Has the advantages that: the structural design who adopts thickening formula end can protect threaded connection department, under the state of guaranteeing joint strength, can promote wear-resisting effect, supplementary with the location fit of basin simultaneously, can ensure to creep into the in-process rivers and pass through smoothly, avoids causing the core barrel impaired owing to wearing and tearing when creeping into, is showing the life who has promoted the core barrel.

Description

High-wear-resistance core tube and drill bit structure and manufacturing method

Technical Field

The invention relates to the technical field of geological exploration, in particular to a high-wear-resistance core tube and drill bit structure and a manufacturing method thereof.

Background

In the geological exploration process, a drill bit is required to be matched with a core tube to sample a core inside a soil layer, water flow flushing is required to be matched in the drilling process so as to facilitate heat dissipation and improve the drilling efficiency, in the process, the hardness of a rock stratum is high during drilling, the drill bit is often worn when in use and needs to be replaced regularly, meanwhile, the drilling depth is increased continuously, the drill bit needs to be matched with the core tube to be installed, in order to improve the overall strength and durability of the core tube, the wall thickness of the core tube needs to be reduced as much as possible, however, adjacent core tubes and the drill bits are connected through threads, when the wall thickness is too thin, the connection strength is affected, meanwhile, the core tube is a consumable, the drill bit below the core tube is prone to be worn and thinned along with the increase of the service time, the drill bit below the core tube is prone to fall off, and the in-hole accidents during drilling are found through tests, the intensity of its threaded connection department of core barrel on the market at present can't be guaranteed, damage easily at follow-up drilling in-process, and then influence power transmission's effect, reduce and creep into efficiency, can bend when serious, cause the production accident, only can regularly detect, avoid excessive wearing and tearing, complex operation, simultaneously, the rivers that creep into the in-process can flow on the outer wall of drill bit and core barrel, also can form and erode pressure, further aggravate the loss, cause the life of core barrel and drill bit can not satisfy the requirement in present stage.

Disclosure of Invention

The invention aims to solve the problems and provide a core tube and a drill bit structure with high wear resistance so as to solve the technical problems that the existing core tube end part has insufficient connection strength at a thread part, is easy to wear and break down during drilling and has short service life in the prior art. According to the invention, the structural design of the thickened end head is adopted in the preferable technical scheme, so that the threaded connection part can be protected, the wear-resisting effect can be improved under the condition of ensuring the connection strength, meanwhile, the water tank is assisted to be positioned and matched, the water flow can be ensured to smoothly pass through in the drilling process, the core tube is prevented from being damaged due to abrasion in the drilling process, and the technical effect of obviously prolonging the service life of the core tube is obviously improved, which is explained in detail in the following.

In order to achieve the purpose, the invention provides the following technical scheme:

the invention provides a high-wear-resistance core tube and drill bit structure and a manufacturing method, comprising the following steps of:

a core barrel for providing drilling support;

the end heads are arranged at two ends of the core tube and are welded and fixed on the core tube;

the drill bit is arranged in the end head through threads;

the connecting section is arranged between the adjacent core pipes and is connected with the core pipes through threads;

and the water tank is arranged on the outer walls of the core tube, the drill bit and the connecting section.

Preferably, the outer wall of the core tube is provided with a wear-resistant coating.

Preferably, the wear-resistant coating is arranged in the middle of the core barrel in a symmetrical structure.

Preferably, the number of the water tanks is six, and each water tank is arranged on the outer walls of the end head, the drill bit and the connecting section at equal intervals in a circumferential array.

Preferably, the water tank is arranged in an inclined mode, and the spiral angle of the water tank is 20-45 degrees when the water tank is opened.

Preferably, the wall thickness of the drill bit is the same as that of the tip reinforcing section.

Preferably, the bottom of the water tank is of an arc-shaped structure.

The invention also provides a manufacturing method of the high-wear-resistance core tube and the drill bit structure, which comprises the following steps:

s1, processing pipe fittings, cutting end faces of the steel pipe raw materials according to the production size requirement to form a core pipe, and polishing and grinding the tangent planes of two end parts of the core pipe to ensure the smoothness;

s2, end machining, namely, cutting end faces of end production raw materials according to the size, polishing and grinding the end faces to ensure smooth finish, and turning the end faces after grinding is finished to enable the outer diameter size of the end to correspond to the outer diameter of the drill bit and the inner diameter size of the end to correspond to the outer diameter of the core tube;

s3, thread machining, namely, performing thread machining on the outer wall of the drill bit and the inner wall of the end head;

s4, forming water grooves, and forming the water grooves corresponding to the end head and the side wall of the drill bit;

s5, welding an end, namely welding the end on the pipe fitting by using a friction welding machine to ensure the coaxiality;

s6, performing heat treatment, namely performing quenching heat treatment on the connection part of the thread and the end head and the core tube, and improving the connection strength and the wear resistance;

s7, turning and polishing, wherein the joint between the end head and the core tube is polished to include an inner wall and an outer wall, so that the joint is ensured to be smooth and flat;

and S8, performing spraying treatment, namely uniformly spraying the wear-resistant coating on the outer wall of the core tube to form the wear-resistant coating.

Has the advantages that:

the structural design who adopts thickening formula end can protect threaded connection department, under the state of guaranteeing joint strength, can promote wear-resisting effect, supplementary with the location fit of basin simultaneously, can ensure to creep into the in-process rivers and pass through smoothly, avoids causing the core barrel impaired owing to wearing and tearing when creeping into, is showing the life who has promoted the core barrel.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is an exploded structural view of the present invention;

FIG. 2 is a perspective view of the present invention in an assembled state;

FIG. 3 is a perspective view of the tip of the present invention;

FIG. 4 is a perspective view of the tip and drill of the present invention;

FIG. 5 is a schematic view of the production process of the present invention.

The reference numerals are explained below:

1. a drill bit; 2. a water tank; 3. a wear-resistant coating; 4. a tip; 5. a connecting section; 6. a core barrel; 7. a thickening section; 8. a threaded segment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

Referring to fig. 1-5, the present invention provides a high wear resistance core barrel and bit construction and method of manufacture comprising:

the core tube 6 is used for providing drilling support, the core tube 6 is a round tube with a hollow inner part and used for supporting a main body so as to facilitate the installation of other components, and the core tube 6 is made of 37Mn5, so that the wear resistance and the overall strength can be ensured;

the end heads 4 are arranged at two ends of the core tube 6 and are welded and fixed on the core tube 6, and the number of the end heads 4 is two and is used for being matched with the core tube 6 for further installation;

the drill bit 1 is arranged in the end head 4 through threads and is used for drilling a rock stratum and performing crushing processing;

the connecting section 5 is arranged between the adjacent core pipes 6, is connected with the core pipes 6 through threads and is used for splicing the two adjacent core pipes 6 through threads, and the material of the connecting section 5 is the same as that of the end head 4 and is 42GrMo, so that the wear-resisting strength can be improved, and the service life of the device can be prolonged;

the water tank 2 is arranged on the outer walls of the core barrel 6, the drill bit 1 and the connecting section 5, and the structural design of the water tank 2 is adopted, so that water flow can be conveniently led out through the water tank 2 in the drilling process, the water flow circulation efficiency is improved, and the cooling effect of the drill bit 1 is ensured;

during the use, assemble core barrel 6, install drill bit 1 to the screw thread section 8 of end 4 in according to the operation requirement, and later assemble core barrel 6, linkage segment 5 and drill bit 1 according to this, assemble the back and install to adjust the basin 2 correspondence between each subassembly, so that adjust.

In another embodiment, the outer wall of the core tube 6 is provided with the wear-resistant coating 3, the wear-resistant coating 3 is made of tungsten carbide, and is sprayed on the outer wall of the core tube 6 during use, and the core tube 6 is large in length and large in diameter, so that the wear pressure in the middle of the core tube is too large during use, the core tube is easy to shift during drilling, the wear condition of the outer wall of the core tube 6 is further increased, the wear-resistant coating 3 is sprayed on the outer wall of the core tube 6 at the moment, the wear resistance of the core tube 6 during rotation can be increased, and the service life of the core tube 6 is prolonged.

In another embodiment, the number of the wear-resistant coatings 3 has two parts, the wear-resistant coatings are arranged in the middle of the core barrel 6 in a symmetrical structure, the distance between the two wear-resistant coatings 3 is 500mm, the width between each wear-resistant coating 3 is 100mm, and the wear-resistant area of the core barrel 6 can be increased by adopting the structural design of symmetrical arrangement, so that the service life of the core barrel 6 is prolonged.

In another embodiment, the number of the water tanks 22 is six, each water tank 2 is arranged on the outer walls of the end 4, the drill bit 1 and the connecting section 5 in a circumferential array at equal intervals, the water tank 2 adopting the structural design can improve the efficiency of water flow discharge during drilling, and meanwhile, when the core tube 6 is connected with the drill bit 1 or the end 4, the positions of the water tanks 2 on the outer walls of the assemblies correspond, so that water is smoothly discharged, and the positioning difficulty is reduced.

In another embodiment, the water tank 2 is arranged in an inclined manner, the spiral angle when the water tank 2 is arranged is 35 degrees, because water injection is needed to be matched with drilling in the drilling process, water supply in the core barrel 6 needs to be led out from a gap between the drill bit 1 and a rock body, so that water drainage is realized, in order to improve the water drainage efficiency, the water tank 2 is arranged at the drill bit 1, the end head 4 and the connecting section 5, but the diameter of the part provided with the water tank 2 is larger, water flow can only be quickly discharged onto the outer wall of the core barrel 6 through the water tank 2, a gap is reserved between the core barrel 6 and a rock stratum which is drilled at the moment, the water flow can flow in the gap, experiments show that when the thread angle of the water tank 2 is too small, the water flow cannot flow in the water tank 2 under the action of centrifugal force, and then overflows from the side wall of the water tank 2, so that the abrasion to the water tank 2 is increased, and the water drainage efficiency is lower, when the thread angle of the water tank 2 is too large, the water tank 2 is difficult to open, the manufacturing cost can be obviously improved, the length of the water tank 2 is increased, the water drainage capacity can be influenced, after the water tank 2 is tested for many times, the water guide effect is best when the spiral angle of the water tank 2 is 35 degrees, the water drainage capacity in unit time can reach the peak value under the working state of matching with the rated rotating speed of a drilling machine, the processing difficulty is moderate, and the water tank belongs to the scheme with the optimal comprehensive capacity.

In another embodiment, the wall thickness of the drill bit 1 is the same as that of the reinforcing section of the end head 4, and it should be noted that the wall thickness of the drill bit 1 and the wall thickness of the reinforcing section in the present invention are both 2.5mm thicker than that of the existing standard pipe fitting, which can increase the wear resistance and prolong the service life of the device.

In another embodiment, the bottom of the water tank 2 is an arc-shaped structure, the depth of the water tank 2 is 2.5mm, and the depth is equal to the increased wall thickness, so that water flow can be discharged conveniently, and meanwhile, the design of the arc-shaped structure can reduce the impact of the water flow during water discharge and improve the drilling stability of the drill bit 1.

The invention also provides a manufacturing method of the high-wear-resistance core tube 6 and the drill bit 1 structure, which comprises the following steps:

s1, processing pipe fittings, cutting end faces of the steel pipe raw materials according to the production size requirement to form a core pipe 6, polishing and grinding the tangent planes of two end parts of the core pipe 6 to ensure the smoothness so as to be convenient for subsequent friction welding;

s2, processing an end head 4, cutting the end face of the end head 4 production raw material according to the size, polishing and grinding to ensure the smooth finish, and turning after grinding, wherein a thickened section 7 is arranged on the end head 4, the size and thickness of the thickened section are 2.5mm greater than the wall thickness of the existing standard pipe fitting, and the thickened section is used for improving the wear-resisting strength, so that the outer diameter of the end head 4 corresponds to the outer diameter of a drill bit 11, and the inner diameter of the end head 4 corresponds to the outer diameter of a core barrel 6, and the installation is facilitated;

s3, thread machining, namely, performing thread machining on the outer wall of the drill bit 1 and the inner wall of the end head 4;

s4, arranging water tanks 2, arranging the water tanks 2 corresponding to the end heads 4 and the side walls of the drill bits 1, wherein the arrangement angles of the water tanks 2 are the same, so that the water tanks can be conveniently assembled in a matching manner;

s5, welding the end 4 on the pipe fitting by using a friction welding machine to ensure coaxiality, and fully positioning the pipe fitting to avoid bending the pipe fitting due to the adoption of the steel pipe structure for welding, but the end 4 is 200mm in length, so that the influence during installation is small, the deflection angle is small, and the subsequent use cannot be influenced;

s6, performing heat treatment, performing quenching heat treatment on the thread and the thread section 8 at the joint of the end 4 and the core barrel 6, improving the connection strength and the wear resistance, and avoiding the damage of the joint of the thread section 8 and the influence on subsequent loading and unloading;

s7, turning and polishing, wherein the joint between the end head 4 and the core barrel 6 is polished to include an inner wall and an outer wall, so that the joint is smooth and flat, and impact is avoided when internal water flows pass through the joint;

and S8, spraying, namely uniformly spraying the wear-resistant coating 3 on the outer wall of the core tube 6 to form the wear-resistant coating 3, and after the spraying is finished, improving the wear resistance.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a high wearability core barrel and drill bit structure which characterized in that: the method comprises the following steps:

a core barrel (6) for providing drilling support;

the end heads (4) are arranged at two ends of the core tube (6) and are welded and fixed on the core tube (6);

the drill bit (1) is arranged in the end head (4) through threads;

the connecting sections (5) are arranged between the adjacent core pipes (6) and are connected with the core pipes (6) through threads;

the water tank (2) is arranged on the outer walls of the core barrel (6), the drill bit (1) and the connecting section (5).

2. The high wear resistance core barrel and bit construction and method of manufacture of claim 1 wherein: and the outer wall of the core tube (6) is provided with a wear-resistant coating (3).

3. The high wear resistance core barrel and bit construction and method of manufacture of claim 2 wherein: the number of the wear-resistant coatings (3) is two, and the wear-resistant coatings are arranged in the middle of the core tube (6) in a symmetrical structure.

4. The high wear resistance core barrel and bit construction and method of manufacture of claim 1 wherein: the number of the water tanks (2) is six, and the water tanks (2) are arranged on the outer walls of the end heads (4), the drill bits (1) and the connecting sections (5) in a circumferential array at equal intervals.

5. The high wear resistance core barrel and bit construction and method of manufacture of claim 1 wherein: the water tank (2) is arranged in an inclined mode, and the spiral angle range when the water tank (2) is opened is (20) - (45) °.

6. The high wear resistance core barrel and bit structure and method of manufacture of claim 1 wherein: the wall thickness of the drill bit (1) is the same as that of the reinforcing section of the end head (4).

7. The high wear resistance core barrel and bit construction and method of manufacture of claim 1 wherein: the bottom of the water tank (2) is of an arc-shaped structure.

8. A method for manufacturing a core tube and a drill bit structure with high wear resistance is characterized by comprising the following steps: the method comprises the following specific steps:

s1, processing pipe fittings, cutting end faces of the steel pipe raw materials according to the production size requirement to form a core pipe (6), and polishing and grinding the tangent planes of two end parts of the core pipe (6) to ensure the smoothness;

s2, processing an end head (4), cutting the end face of the production raw material of the end head (4) according to the size, polishing and grinding to ensure the smoothness, and turning after grinding to ensure that the outer diameter of the end head (4) corresponds to the outer diameter of the drill bit (1) and the inner diameter of the end head (4) corresponds to the outer diameter of the core barrel (6);

s3, performing thread machining, namely performing thread machining on the outer wall of the drill bit (1) and the inner wall of the end head (4);

s4, opening the water tank (2), and opening the water tank (2) corresponding to the end (4) and the side wall of the drill bit (1);

s5, welding the end (4), and welding the end (4) on the pipe fitting by using a friction welding machine to ensure the coaxiality;

s6, performing heat treatment, namely performing quenching heat treatment on the connection part of the screw thread and the end head (4) and the core tube (6), and improving the connection strength and the wear resistance;

s7, turning and polishing, wherein the joint between the end head (4) and the core tube (6) is polished to include an inner wall and an outer wall, so that the joint is ensured to be smooth and flat;

and S8, performing spraying treatment, namely uniformly spraying the wear-resistant coating (3) on the outer wall of the core tube (6) to form the wear-resistant coating (3).