Single-action double-tube coring drill
By designing a frustum-shaped side structure for the circlip and spring seat in the single-action double-tube coring drill bit, the problem of easy core slippage in coal-bearing geology was solved, and the core success rate was improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAANXI COAL GRP SHENMU HONGLIULIN MINING CO LTD
- Filing Date
- 2025-05-13
- Publication Date
- 2026-05-15
AI Technical Summary
In coal-bearing geological drilling, the coal formation is relatively soft and brittle. After being soaked by the flushing fluid, it is easy to form broken pieces, which makes it impossible for the retaining spring to effectively hold the core, resulting in core sampling failure.
The design employs a retaining ring and retaining spring seat. The retaining ring reciprocates within the annular groove, and combined with the frustum-shaped side structure of the retaining spring seat, it ensures that the retaining spring gradually tightens around the core, preventing the core from slipping.
This technology prevents core fragments from easily detaching during drilling, improves the success rate of core sampling, and avoids the problem of core fragment failure due to tight grip.
Smart Images
Figure CN224244831U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of coal geological exploration and relates to a single-action double-tube coring drill. Background Technology
[0002] The single-action double-tube coring tool is a device used for drilling rock core samples underground. It is of great significance for analyzing the distribution and content of coal in coal-bearing geology and the soil structure of coal-bearing geology.
[0003] The single-action double-tube coring drill is a mature drilling equipment. When in use, the outer tube drives the drill bit to run, and the rock core enters the inner tube. Both the inner tube and the rock core remain stationary, which can avoid damage to the rock core structure. At the same time, flushing fluid is injected into the gap between the outer tube and the inner tube, which has the functions of cooling and flushing rock dust.
[0004] After drilling is completed, the inner tube is pulled out from the outer tube to perform core sampling. To prevent the core from falling out of the inner tube, a retaining spring is installed at the bottom of the inner tube. When the inner tube moves upward, the retaining spring moves downward relative to the inner tube and holds the core tightly to prevent it from falling out.
[0005] When drilling in coal-bearing geology, the coal formation is relatively soft and brittle. After being soaked in flushing fluid, it is even more prone to forming broken blocks and softer cores. When the retaining spring moves downward relative to the inner tube, the core is squeezed outward, causing the retaining spring to fail to hold the core tightly, which is one of the reasons for core sampling failure. Utility Model Content
[0006] To overcome the deficiencies in the aforementioned related technologies, this utility model proposes a single-action double-tube coring drill. The single-action double-tube coring drill includes: an outer tube, a drill bit, an inner tube, a retaining ring seat, a retaining ring, and a retaining ring. The outer tube is a vertically arranged tube. The drill bit is a vertically arranged tubular structure, fixed to the lower end of the outer tube. The inner tube is a vertically arranged tube, movably fitted inside the outer tube. The retaining ring seat is a tubular structure open at both ends, fixed to the lower end of the inner tube. The lower part of the retaining ring seat is a truncated cone side that tapers inward from top to bottom. An annular groove is provided on the conical surface, and the bottom surface of the annular groove is parallel to the truncated cone side. The retaining ring is an annular component adapted to the annular groove, and an open slot is provided on the retaining ring. The retaining ring is movably disposed within the annular groove, exhibiting a tendency to reciprocate vertically within the annular groove, and the inner surface of the retaining ring does not extend beyond the curved surface of the truncated cone side. The retaining ring is a ring-shaped component with a through groove, and the retaining ring is movably disposed within the retaining ring seat.
[0007] Preferably, the annular groove is located at the lower part of the conical surface; the width of the annular groove is 1.5 to 2 times the width of the retaining ring.
[0008] Preferably, the inner side of the retaining ring is provided with a plurality of teeth, which are arranged laterally and the tips of the teeth do not extend beyond the curved surface on which the side of the frustum is located.
[0009] Preferably, the inner wall of the retaining ring seat at the lower end of the side of the frustum is provided with an annular step, which is adapted to the retaining ring.
[0010] Preferably, the retaining ring seat above the side of the frustum is a cylindrical tube, which includes an upper tube and a lower tube. The upper tube and the lower tube form a stepped tube structure with an increasing inner diameter from bottom to top. The retaining ring is movably disposed inside the lower tube, and the height of the lower tube is greater than the height of the retaining ring.
[0011] Preferably, the single-action double-tube coring tool further includes a clamp, which is an annular component. The lower end of the clamp has an inwardly folded edge, and the side wall of the clamp has a through groove. The clamp has a bend at the edge of the through groove that bends inward. The clamp is located below the retaining spring. The two edges of the retaining spring through groove are inserted into the two bends one-to-one. The lower end of the retaining spring abuts against the folded edge. The clamp is also located between the retaining spring and the retaining spring seat.
[0012] Preferably, the inner diameter of the lower end of the snap ring seat is not greater than the inner diameter of the snap ring.
[0013] The beneficial effects of this utility model are as follows:
[0014] This invention employs a retaining ring and a lower tube whose height is greater than that of the retaining spring. When the retaining spring seat is lifted upwards with the inner tube, the retaining ring and retaining spring move downwards relative to the retaining spring seat. Because the bottom of the annular groove is a frustum side structure, the retaining ring first forms a clamping and squeezing effect on the rock core. Then, as the retaining spring seat continues to be lifted, the retaining spring continues to move downwards relative to the retaining spring seat and enters the frustum side area, where the retaining spring clamps the rock core. At this time, the retaining ring forms a clamping effect on the rock core below the retaining spring. When the retaining spring continuously clamps the rock core, it can reduce the occurrence of the rock core being squeezed out by the retaining spring, thereby achieving the purpose of the retaining spring clamping the rock core tighter and tighter, and preventing the rock core from slipping out of the retaining spring and causing the clamping to fail. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a structural diagram of the present invention;
[0017] Figure 2 This is a structural diagram of the snap ring holder of this utility model;
[0018] Figure 3 This is a structural diagram of the retaining ring of this utility model;
[0019] Figure 4 This is an assembly drawing of the snap ring and clamp of this utility model. Detailed Implementation
[0020] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0021] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0022] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0023] like Figures 1 to 4As shown, some embodiments of this utility model propose a single-action double-tube coring drill. The single-action double-tube coring drill includes: an outer tube 1, a drill bit 2, an inner tube 3, a retaining ring seat 4, a retaining ring 5, and a retaining ring 6. The outer tube 1 is a vertically arranged tube. The drill bit 2 is a vertically arranged tubular structure, fixed to the lower end of the outer tube 1. The inner tube 3 is a vertically arranged tube, movably fitted inside the outer tube 1. The retaining ring seat 4 is a tubular structure open at both ends, fixed to the lower end of the inner tube 3. The lower part of the retaining ring seat 4 is a frustum-shaped side surface 41 that tapers inward from top to bottom. An annular groove 42 is provided on the conical surface, and the bottom surface of the annular groove 42 is parallel to the frustum-shaped side surface 41. The retaining ring 5 is an annular component adapted to the annular groove 42, and the retaining ring 5 is provided with an open groove 51. The retaining ring 5 is movably disposed within the annular groove 42, and the retaining ring 5 has a tendency to reciprocate vertically within the annular groove 42. The inner surface of the retaining ring 5 does not extend beyond the curved surface of the frustum side 41. The retaining spring 6 is an annular component, and the retaining spring 6 is provided with a through groove 61. The retaining spring 6 is movably disposed within the retaining spring seat 4.
[0024] The annular groove 42 is disposed at the lower part of the conical surface; the width of the annular groove 42 is 1.5 to 2 times the width of the retaining ring 5.
[0025] The inner side of the retaining ring 5 is provided with multiple teeth, which are arranged laterally and the tips of the teeth do not extend beyond the curved surface of the side surface 41 of the frustum.
[0026] An annular step is provided on the inner wall of the retaining spring seat 4 at the lower end of the side surface 41 of the frustum, and the annular step is adapted to the retaining spring 6.
[0027] The retaining ring seat 4 above the side 41 of the frustum is a cylindrical tube 43, which includes an upper tube 431 and a lower tube 432. The upper tube 431 and the lower tube 432 form a stepped tube structure with an increasing inner diameter from bottom to top. The retaining ring 6 is movably disposed in the lower tube 432, and the height of the lower tube 432 is greater than the height of the retaining ring 6.
[0028] The single-action double-tube coring tool also includes a clamp 7, which is an annular component. The lower end of the clamp 7 is provided with an inwardly folded edge. The side wall of the clamp 7 is provided with a through groove 61, and the clamp 7 is provided with a bend inward at the edge of the through groove 61. The clamp 7 is located at the lower part of the retaining spring 6. The two edges of the retaining spring 6 through groove 61 are inserted into the two bends one-to-one. The lower end of the retaining spring 6 abuts against the folded edge. The clamp 7 is also located between the retaining spring 6 and the retaining spring seat 4.
[0029] The inner diameter of the lower end of the snap ring seat 4 is not greater than the inner diameter of the snap ring 6.
[0030] The specific operation process of this utility model is as follows:
[0031] During drilling, the core enters the inner tube 3 from the retaining ring seat 4. The core pushes the retaining ring 5 and retaining spring 6 upwards. Specifically, the retaining ring 5 is pushed to contact the upper end face of the annular groove 42, and the retaining spring 6 contacts the lower end of the upper tube 431. After drilling is completed, the inner tube 3 is lifted upwards. Under the action of the core, both the retaining ring 5 and retaining spring 6 move downwards relative to the inner tube 3. During the relative movement phase in the lower tube 432, the retaining spring 6 maintains a constant inner diameter, while the inner diameter of the retaining ring 5 gradually decreases during relative movement in the annular groove 42. The change in the inner diameter of the retaining ring 5 is relatively small, which can form a certain squeezing force on the core. Then, the retaining spring 6 enters the frustum side 41 stage, gradually squeezing the core. Under the certain squeezing action of the retaining ring 5 on the core, the core can be prevented from falling out of the retaining spring 6, thus making the retaining spring 6 hold the core tighter and tighter.
[0032] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.
[0033] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. A single-action double-tube coring drill bit, characterized in that, include: The outer tube is a vertically arranged pipe fitting; The drill bit is a vertically arranged tubular structure and is fixed to the lower end of the outer tube; Inner tube, which is a vertically arranged pipe fitting, is movably fitted inside the outer tube; A snap ring seat, wherein the snap ring seat is a tubular structure open at both ends, the snap ring seat is fixed to the lower end of the inner tube, and the lower part of the snap ring seat is a truncated cone side surface that tapers inward from top to bottom, and an annular groove is provided on the conical surface, and the bottom surface of the annular groove is parallel to the truncated cone side surface. A retaining ring, wherein the retaining ring is an annular component adapted to the annular groove, and the retaining ring is provided with an open groove, the retaining ring is movably disposed in the annular groove, the retaining ring has a tendency to reciprocate in the vertical direction within the annular groove, and the inner surface of the retaining ring does not exceed the curved surface where the side surface of the frustum is located. A retaining ring, wherein the retaining ring is a ring-shaped component, the retaining ring is provided with a through groove, and the retaining ring is movably disposed within the retaining ring seat.
2. The single-action double-tube coring drill bit according to claim 1, characterized in that, The annular groove is disposed at the lower part of the conical surface; The width of the annular groove is 1.5 to 2 times the width of the retaining ring.
3. The single-action double-tube coring drill bit according to claim 2, characterized in that, The inner side of the retaining ring is provided with multiple teeth, which are arranged laterally and the tips of the teeth do not extend beyond the curved surface of the side of the frustum.
4. The single-action double-tube coring drill bit according to claim 3, characterized in that, An annular step is provided on the inner wall of the retaining spring seat at the lower end of the side of the frustum, and the annular step is adapted to the retaining spring.
5. The single-action double-tube coring drill bit according to claim 4, characterized in that, The retaining ring seat above the side of the frustum is a cylindrical tube, which includes an upper tube and a lower tube. The upper tube and the lower tube form a stepped tube structure with an increasing inner diameter from bottom to top. The retaining ring is movably disposed inside the lower tube, and the height of the lower tube is greater than the height of the retaining ring.
6. The single-action double-tube coring drill bit according to claim 5, characterized in that, The single-action double-tube coring tool also includes a clamp, which is a ring-shaped component. The lower end of the clamp has an inwardly folded edge. The side wall of the clamp has a through groove, and the clamp has a bend at the edge of the through groove that bends inward. The clamp is located below the retaining spring. The two edges of the retaining spring through groove are inserted into the two bends one-to-one. The lower end of the retaining spring abuts against the folded edge. The clamp is also located between the retaining spring and the retaining spring seat.
7. The single-action double-tube coring drill bit according to claim 6, characterized in that, The inner diameter of the lower end of the snap ring seat is not greater than the inner diameter of the snap ring.