Complex stratum deep hole geological drilling construction coring device

Abstract

The utility model discloses a complex stratum deep hole geological drilling construction coring device in the field of drill bits, which comprises a hard alloy drill bit and an outer drill cylinder, one end of the outer drill cylinder is connected with the hard alloy drill bit, the other end of the outer drill cylinder is detachably connected with a drill rod, and a coring channel penetrating through the upper end and the lower end of the hard alloy drill bit is arranged in the middle of the hard alloy drill bit. A containing cavity is defined by the lower end of the drill rod, the outer drill cylinder and an inner cavity of the hard alloy drill bit, a core drilling rod and a coring cylinder are arranged in the containing cavity, the outer structures of the core drilling rod and the coring cylinder are the same as those of the containing cavity, and the core drilling rod and the coring cylinder can be installed in a replaceable mode. The lower end of the cylinder is open and does not exceed the lower end of the hard alloy drill bit. In the drilling process, the core drilling rod can be installed in the containing cavity, the drill bit can directly and rapidly drill to the specific depth, when coring is needed, the core drilling rod is replaced with the coring barrel, the drilling effect can be guaranteed, meanwhile, a rock core enters the coring barrel, and therefore the rock core with the specific depth can be rapidly extracted.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of drill bit especially relates to a complex stratum deep hole geological drilling construction coring device. BACKGROUND

[0002] When geological exploration, soil sampling can be carried out to study the soil. Generally, when soil sampling, drilling and coring equipment is needed.

[0003] In the prior art, the Chinese patent with publication number CN220580994U provides a complex stratum deep hole geological drilling construction coring device, which forms a wire rope cage with a coring wire rope to net the broken core blocks. This scheme can solve the problem of low core extraction rate in broken stratum and gravel layer during geological drilling, and improve the drilling construction efficiency; during drilling and coring, the work cycle time of repeatedly fishing core and coring is reduced. The device has the following disadvantages: the cylindrical drill bit fills with rock soil in the drill bit during drilling, affecting the drilling effect, and only one segment of core can be extracted at a time, and the device cannot directly reach a specific depth to extract the rock layer, resulting in low efficiency. In addition, the steel wire rope cage in the coring barrel forms an inverted funnel, and the core blocks are prone to fall out of the inverted steel wire rope cage during the coring process. UTILITY MODEL CONTENTS

[0004] To overcome the above-mentioned deficiencies of the existing geological drilling construction coring device, the technical problem to be solved by the utility model is to provide a complex stratum deep hole geological drilling construction coring device that can directly extract core at a specific depth.

[0005] The technical scheme adopted by the utility model to solve its technical problem is:

[0006] A complex stratum deep hole geological drilling construction coring device, comprising a hard alloy drill bit and an outer drill barrel, one end of the outer drill barrel is connected with the hard alloy drill bit, the other end is provided with a butt joint structure that can be detachably connected with a drill rod, a core extraction channel is formed through the upper and lower ends of the hard alloy drill bit, the upper end of the core extraction channel is in communication with the internal cavity of the outer drill barrel, the lower end of the drill rod and the internal cavities of the outer drill barrel and the hard alloy drill bit form a containing cavity, a drill core rod and a core extraction barrel that can be replaced and installed are arranged in the containing cavity, the lower end of the drill core rod passes through the lower end of the hard alloy drill bit, the core extraction barrel comprises a barrel body and an end cover arranged at the top of the barrel body, the lower end of the barrel body is an open structure and does not exceed the lower end of the hard alloy drill bit.

[0007] Further, the end of the hard alloy drill bit away from the outer drill barrel is a hemispherical surface, and a plurality of cutting edges are arranged on the hemispherical surface, and a plurality of protrusions are uniformly distributed along the length direction of each cutting edge.

[0008] Further, the outer drill cylinder is provided with a plurality of scrapers along the circumference of the outer side of the outer drill cylinder, and the outer side of the scrapers is flush with the outer edge of the hard alloy drill bit.

[0009] Further, the upper end of the outer drill cylinder is connected with the lower end of the drill rod through screw threads.

[0010] Further, the inner wall of the upper end of the outer drill cylinder is provided with a first step surface, and the second step surface is arranged between the lower end of the outer drill cylinder and the upper end of the coring channel, and the drill core rod and the coring cylinder are positioned through the abutting of the positioning shoulder on the outer wall and the third step surface with the first step surface and the second step surface respectively, and are fixed in the accommodating cavity through the pressing of the drill rod on the top of the drill core rod and the coring cylinder and the positioning shoulder.

[0011] Further, the end cover of the coring cylinder is connected with the cylinder body through screw threads.

[0012] Further, the lower end of the coring channel of the hard alloy drill bit is provided with a stop ring integrally formed with the hard alloy drill bit, the inner diameter of the stop ring is less than or equal to the inner diameter of the middle cavity of the coring cylinder, the lower end of the coring cylinder abuts against the upper end surface of the stop ring, and the inner wall of the coring cylinder is provided with a roughened structure.

[0013] The hard alloy drill bit and the outer drill cylinder with the accommodating cavity are adopted, the drill core rod can be installed in the accommodating cavity during drilling, the drill bit can be directly and quickly drilled to a specific depth, the drill core rod is replaced by the coring cylinder when coring is needed, the rock core can be ensured to enter the coring cylinder while the drilling effect is ensured, and therefore the quick extraction of the rock core at the specific depth is realized. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a structural schematic view of the utility model;

[0015] Figure 2 is a sectional view of the utility model with the drill core rod;

[0016] Figure 3 is a sectional view of the utility model with the coring cylinder;

[0017] Figure 4 is a structural schematic view of the coring cylinder of the utility model;

[0018] Figure 5 is Figure 3 the enlarged view of part A in the middle.

[0019] 1-hard alloy drill bit, 2-outer drill cylinder, 3-drill rod, 4-core drill rod, 5-core taking cylinder, 11-core taking channel, 12-cutting edge, 13-convex strip, 14-stop ring, 21-first step surface, 22-second step surface, 23-scraper, 51-cylinder body, 52-end cover, 53-positioning shaft shoulder, 54-third step surface. DETAILED DESCRIPTION

[0020] The utility model is further explained below in connection with the drawings.

[0021] It should be noted that if the utility model has involved directional indication language, such as up, down, left, right, front, back, direction, position language, it is for the convenience of the description of the relative position between components, not the absolute position of the relevant components, the position relationship between components, and only for explaining the relative position relationship, movement condition and the like between components in a certain attitude, if the certain attitude changes, the directional indication also changes accordingly. If the utility model has involved the language of quantity, such as '' many'', '' multiple'', '' several '' and the like, it specifically refers to two and more than two.

[0022] As Figures 1-3 Indicated, a kind of complex stratum deep hole geological drilling construction coring device provided by the utility model, including hard alloy drill bit 1 and outer drill cylinder 2, outer drill cylinder 2 one end is connected with hard alloy drill bit 1, the other end is equipped with the butt joint structure of detachable connection with drill rod 3, the middle part of the hard alloy drill bit 1 is equipped with the core taking channel 11 passing through the upper and lower ends thereof, the upper end of core taking channel 11 is connected with the internal cavity of outer drill cylinder 2, the internal cavity of outer drill cylinder 2 and hard alloy drill bit 1 is enclosed into a containing cavity with the lower end of drill rod 3, the drill core rod 4 and the replaceable installation core taking cylinder 5 of the same external structure with containing cavity are equipped in the containing cavity, the lower end of drill core rod 4 passes through the lower end of hard alloy drill bit 1, the core taking cylinder 5 includes cylinder body 51 and the end cover 52 arranged at the top of cylinder body 51, the lower end of cylinder body 51 is open structure and does not exceed the lower end of hard alloy drill bit 1.

[0023] The use process of the utility model is: the device is used in cooperation with existing deep hole geological drilling machine, the drill rod 3 is the matched drill rod of deep hole geological drilling machine. When drilling phase, install drill core rod 4 in containing cavity, drill core rod 4 is also hard alloy material, its lower end fills core taking channel 11, and has the drilling surface matched with hard alloy drill bit 1, forms a solid drill bit, as shown in Figure 2 When drilling phase, install drill core rod 4 in containing cavity, drill core rod 4 is also hard alloy material, its lower end fills core taking channel 11, and has the drilling surface matched with hard alloy drill bit 1, forms a solid drill bit, as shown in Figure 3As shown, then along the borehole down the drill bit, the drill bit and hole bottom contact, start drilling equipment to continue drilling down, at this time the core will enter into the core barrel 5, drilling to a certain depth, the rock is extruded to form a dense rock sample, with the core barrel 5 inner wall tight contact, finally, pull up the drill bit, under the action of friction, rock sample with the drill bit is taken out, complete sampling operation.

[0024] In order to improve the drilling effect of the drill bit, the hard alloy drill bit 1 is away from the outer drill barrel 2 one end of the hemisphere, the hemisphere is provided with a plurality of cutting edges 12, each cutting edge 12 is uniformly distributed with a plurality of convex strips 13 along the length direction. The drilling surface of the hard alloy drill bit 1 is arranged as a hemisphere, which can ensure that the hard alloy drill bit 1 still has sufficient drilling capacity after the drill core rod 4 is replaced by the core barrel 5. The cooperation of the cutting edge 12 and the convex strip 13 can improve the ability of the hard alloy drill bit 1 to break the rock mass, thereby improving the drilling effect. In addition, in order to ensure that the drill core rod 4 has the same effect, cutting edges and convex strips can also be arranged on the end of the drill core rod 4, and at the same time, the drill core rod 4 and the drill rod 3 or the outer drill barrel 2 need to be treated to prevent rotation, such as setting the top of the drill core rod 4 as a square head, the lower end of the drill rod 3 is provided with a rectangular slot matched with the square head; or the cross section of the part of the drill rod 3 located in the outer drill barrel 2 is rectangular, and the cross section of the cavity in the outer drill barrel 2 is also rectangular, so as to ensure that the drill core rod 4 can rotate with the hard alloy drill bit 1.

[0025] During the drilling process, it is possible that the hole wall loosens and causes the drilling to be blocked, affecting the smoothness of the drill lifting. Therefore, preferably, the outer side of the outer drill barrel 2 is provided with a plurality of scrapers 23 along the circumference thereof, and the outer side of the scraper 23 is flush with the outer edge of the hard alloy drill bit 1. During the drilling process, the scraper 23 can play a role of scraping and compacting the hole wall, thereby ensuring the smoothness of the subsequent drilling and coring process.

[0026] For the connection mode of the drill rod 3 and the outer drill barrel 2, the plug-in fixing, the pin shaft or bolt connection and the like can be adopted. Preferably, the upper end of the outer drill barrel 2 and the lower end of the drill rod 3 are connected through threads, which is convenient for disassembly and installation, and is beneficial to the replacement of the drill core rod 4 and the core barrel 5.

[0027] As Figures 1-4As shown, in order to ensure the installation accuracy and stability of the core drill rod 4 and the core barrel 5 in the accommodating cavity, a first step surface 21 is provided on the inner wall of the upper end of the outer drill barrel 2, and a second step surface 22 is provided between the lower end of the outer drill barrel 2 and the upper end of the coring channel 11. The inner diameter of the cavity where the first step surface 21 is located is larger than the inner diameter of the cavity where the second step surface 22 is located, ensuring that the core drill rod 4 and the core barrel 5 can be loaded into the accommodating cavity from top to bottom. When installed in place, the core drill rod 4 and the core barrel 5 are positioned by the positioning shoulder 53 and the third step surface 54 on their outer walls respectively contacting the first step surface 21 and the second step surface 22. In order to facilitate the removal of the core drill rod 4 and the core barrel 5, when installed in place, the top of the core drill rod 4 and the core barrel 5 should exceed the upper end of the outer drill barrel 2. Therefore, in order to adapt to this, the lower end of the drill rod 3 should be provided with a groove structure adapted to the top of the core drill rod 4 and the core barrel 5. When installing the drill rod 3, the bottom of the groove of the drill rod 3 will abut against the top of the core rod 4 and the core barrel 5, and the edge of the drill rod 3 will abut against the upper end of the positioning shaft shoulder 53, thereby pressing and fixing the core rod 4 and the core barrel 5 in the accommodating cavity.

[0028] For the core barrel 5, as Figure 4 As shown, the end cap 52 is detachably mounted on the top of the barrel 51 to compress and secure the core during coring. After coring, the end cap 52 can be removed and the core can be pushed out of one end of the barrel 51 using a push rod. This is quick and convenient and ensures the integrity of the core. The end cap 52 of the coring barrel 5 is preferably threadedly connected to the barrel 51 to facilitate disassembly and installation.

[0029] Furthermore, since the core barrel 5 is a hollow structure with a thin wall thickness and a longitudinal bearing capacity, in order to prevent the core barrel 5 from being crushed during the coring process, a retaining ring 14 integrally formed with the carbide drill bit 1 can be provided at the lower end of the coring channel 11 of the carbide drill bit 1, as shown in FIG. Figure 5 As shown, the inner diameter of the retaining ring 14 is less than or equal to the inner diameter of the central cavity of the core barrel 5, the lower end of the core barrel 5 abuts against the upper end face of the retaining ring 14, and the inner wall of the core barrel 5 is provided with a roughened structure. The retaining ring 14 shields the lower end of the core barrel 5, which can reduce the longitudinal force on the core barrel 5 during the drilling process, and also allows the rock mass to better enter the core barrel 5 without entering the gap between the core barrel 5 and the core channel 11. In addition, during the subsequent drilling process, the retaining ring 14 can also provide a certain support for the lower edge of the internally compacted core to prevent the core from slipping.

[0030] In conclusion, the utility model discloses a hard alloy drill bit and outer drill cylinder having containing cavity internally, can install the drill core rod in the containing cavity in the drilling process, makes the drill bit can directly and quickly drill to the specific depth, needs to replace the drill core rod with the core taking cylinder when taking the core, can make the rock core into the core taking cylinder while ensuring the drilling effect, thereby realizes the quick extraction of the rock core of specific depth, has good practicality and application value.

Claims

1. A coring device for deep-hole geological drilling construction in complex strata, comprising a carbide drill bit (1) and an outer drill barrel (2), wherein one end of the outer drill barrel (2) is connected to the carbide drill bit (1) and the other end is provided with a docking structure that can be detachably connected to a drill rod (3), characterized in that: The carbide drill bit (1) is provided with a coring channel (11) running through its upper and lower ends in the middle thereof, the upper end of the coring channel (11) is communicated with the internal cavity of the outer drill barrel (2), the lower end of the drill rod (3) and the internal cavity of the outer drill barrel (2) and the carbide drill bit (1) enclose a receiving chamber, and a replaceable core rod (4) and a core barrel (5) having the same external structure as the receiving chamber are provided in the receiving chamber, the lower end of the core rod (4) passes through the lower end of the carbide drill bit (1), and the core barrel (5) comprises a barrel body (51) and an end cover (52) arranged on the top of the barrel body (51), and the lower end of the barrel body (51) is an open structure and does not exceed the lower end of the carbide drill bit (1).

2. The deep hole geological drilling construction coring device for complex strata according to claim 1, characterized in that: The end of the carbide drill bit (1) away from the outer drill tube (2) is a hemispherical surface, and a plurality of cutting edges (12) are provided on the hemispherical surface. Each cutting edge (12) is evenly distributed with a plurality of convex strips (13) along its length direction.

3. The deep hole geological drilling construction coring device for complex strata according to claim 1, characterized in that: The outer side of the outer drill tube (2) is provided with a plurality of scrapers (23) along its circumference, and the outer sides of the scrapers (23) are flush with the outer edges of the carbide drill bit (1).

4. The deep hole geological drilling construction coring device for complex strata according to claim 1, characterized in that: The upper end of the outer drill tube (2) is connected to the lower end of the drill rod (3) via threads.

5. The complex stratum deep hole geological drilling construction coring device according to claim 1, characterized in that: A first step surface (21) is provided on the inner wall of the upper end of the outer drill tube (2), and a second step surface (22) is provided between the lower end of the outer drill tube (2) and the upper end of the coring channel (11). The core drill rod (4) and the coring tube (5) are positioned by respectively contacting the first step surface (21) and the second step surface (22) with the positioning shoulder (53) and the third step surface (54) on their outer walls, and are fixed in the accommodating cavity by the pressing action of the drill rod (3) on the top of the core drill rod (4) and the coring tube (5) and the positioning shoulder (53).

6. The complex stratum deep hole geological drilling construction coring device according to claim 1, characterized in that: The end cover (52) of the core-taking barrel (5) is connected to the barrel body (51) via a threaded connection.

7. The complex stratum deep hole geological drilling construction coring device according to claim 1, characterized in that: The lower end of the coring channel (11) of the carbide drill bit (1) is provided with a retaining ring (14) integrally formed with the carbide drill bit (1), the inner diameter of the retaining ring (14) is smaller than or equal to the inner diameter of the central cavity of the coring barrel (5), the lower end of the coring barrel (5) abuts against the upper end surface of the retaining ring (14), and the inner wall of the coring barrel (5) is provided with a roughening structure.

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