An auxiliary core sampling device for geological exploration engineering

Abstract

The present invention relates to the technical field of drilling sampling, and specifically relates to an auxiliary core sampling device for geological exploration engineering, which includes an outer pipe. A drill bit is provided at the end of the outer pipe, and the drill bit is used for drilling and sampling the core. An inner pipe is provided inside the outer pipe. A mounting seat is coaxially provided at one end of the inner pipe close to the drill bit. A disc spring assembly and a push ring are slidably provided inside the mounting seat. The disc spring assembly includes at least two first disc springs arranged in sequence along the axial direction of the mounting seat. The concave surfaces of the first disc springs all face the push ring. One of the at least two first disc springs is in contact with the push ring, and the concave surfaces of the remaining first disc springs are all connected with rotating disc springs through elastic members. When taking out the core, the outer pipe moves axially relative to the inner pipe along the axial direction of the mounting seat and squeezes the push ring, causing the push ring to slide and axially squeeze the disc spring assembly. The first disc springs are compressed and deformed to tightly press the outer peripheral surface of the core. At the same time, the rotating disc springs will tilt along the axial direction of the mounting seat, thereby increasing the friction between the inner peripheral surface of the rotating disc springs and the core.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling sampling, and particularly to an auxiliary core sampling device for geological exploration engineering. Background Art

[0002] During geological exploration, core sampling is often required. Core sampling is to sample and study the geological soil at a certain depth to achieve the research of geological exploration engineering.

[0003] In the prior art, wireline core drilling tools are often used for core sampling. The wireline core drilling tool usually includes a fishing tool, an outer pipe and an inner pipe. A clamping seat is provided at the end of the inner pipe. The clamping seat is used to lock the core sample in the inner pipe. The clamping seat is two annular elastic pieces, and a sliding connecting piece is provided between the two annular elastic pieces. When the outer pipe moves relative to the inner pipe, the inner conical surface at the end of the outer pipe makes the two annular elastic pieces approach each other to clamp the core sample. However, when the core sample is broken off during extraction, if the core sample is hard, the core sample is likely to slip, so that the core sample is easily separated from the inner pipe, affecting the core sampling efficiency. Summary of the Invention

[0004] Based on this, in view of the technical problem that the current wireline sampling drill tool is likely to cause the core sample to separate, it is necessary to provide an auxiliary core sampling device for geological exploration engineering.

[0005] The above object is achieved by the following technical solutions:

[0006] An auxiliary core sampling device for geological exploration engineering includes an outer pipe. A drill bit is provided at the end of the outer pipe. The drill bit is used for drilling and sampling the core sample. An inner pipe is provided inside the outer pipe. A mounting seat is coaxially provided at one end of the inner pipe close to the drill bit. A disc spring assembly and a pushing ring are slidably provided inside the mounting seat. The pushing ring is clamped at the end of the mounting seat. The disc spring assembly includes at least two first disc springs arranged in sequence along the axial direction of the mounting seat. The concave surfaces of the first disc springs all face the pushing ring. One of the at least two first disc springs is in contact with the pushing ring, and the concave surfaces of the remaining first disc springs are all connected with a rotating disc spring through an elastic member. The inner diameter of the rotating disc spring is the same as the inner diameter of the first disc spring, and the concave surface of the rotating disc spring is arranged opposite to the concave surface of the first disc spring. During the process of drilling and sampling the core sample, the core sample can enter the inside of the disc spring assembly and the pushing ring. When taking out the core sample, the outer pipe moves axially relative to the inner pipe along the mounting seat and squeezes the pushing ring, so that the pushing ring slides and axially squeezes the disc spring assembly. The first disc spring is deformed under pressure to tightly press the outer peripheral surface of the core sample. At the same time, the rotating disc spring will tilt axially along the mounting seat, thereby increasing the friction between the inner peripheral surface of the rotating disc spring and the core sample.

[0007] Further, the elastic member includes a first spring and a second spring. The straight line where the first spring and the second spring are connected is parallel to the diameter of the first disc spring. The first spring and the second spring have the same length and both extend along the axial direction of the mounting seat. The elastic coefficient of the first spring is less than that of the second spring.

[0008] Further, the disc spring assembly further includes a second disc spring. The second disc spring is located on the side of at least two first disc springs away from the pushing ring. The size of the second disc spring is the same as that of the first disc spring. The convex surface of the second disc spring is arranged opposite to the convex surface of the first disc spring.

[0009] Further, the number of the first disc springs is three.

[0010] Further, the number of the second disc springs is one.

[0011] Further, the outer periphery of the rotating disc spring is oval.

[0012] Further, a pushing surface is provided at one end of the outer tube close to the drill bit. An outer conical surface is provided at one end of the pushing ring facing the drill bit. The pushing surface and the outer conical surface are in axial stop fit along the mounting seat.

[0013] Further, a positioning step is provided on the inner peripheral surface of one end of the mounting seat away from the pushing ring. The disc spring assembly and the positioning step are in axial stop fit on the mounting seat.

[0014] Further, a convex ring is provided on the inner peripheral surface of one end of the mounting seat provided with the pushing ring. An annular groove is provided on the outer peripheral surface of the pushing ring. The convex ring can slide axially in the annular groove along the mounting seat.

[0015] Further, the auxiliary coring device for geological exploration engineering further includes a fishing tool for fishing the inner tube. A clamping rod is provided at the end of the inner tube. A hook is provided on the fishing tool. The hook and the clamping rod are in clamping fit.

[0016] The beneficial effects of the present invention are as follows:

[0017] For the auxiliary coring device for geological exploration engineering provided by the present invention, first, when taking out the core sample, not only will the first disc spring be compressed and deformed to tightly press the outer peripheral surface of the core sample, but at the same time, the rotating disc spring will tilt. The tilted rotating disc spring will generate a positive pressure on a local area of the outer peripheral surface of the core sample, thereby increasing the friction between the rotating disc spring and the core sample, further clamping the core sample tightly, and avoiding the core sample from slipping in the inner tube and thus detaching from the inner tube when the core sample is pulled and broken, ensuring the coring efficiency.

[0018] Second, the convex surfaces of the second disc spring and the first disc spring are arranged opposite to each other, so that the inclination direction of the cross-section of the first disc spring is opposite to that of the second disc spring. When the first disc spring and the second disc spring are compressed simultaneously, two clamping forces in opposite directions will be generated on the sample core, thereby further preventing the sample core from detaching from the inner tube.

[0019] Third, the outer circumference of the rotating disc spring is oval, making it easier for the long axis direction of the rotating disc spring to deform, thus making it easier for the rotating disc spring to tilt, and then the rotating disc spring can easily clamp the sample core. Description of the Drawings

[0020] Figure 1 Schematic perspective view of an auxiliary core sampling device for geological exploration engineering provided by an embodiment of the present invention;

[0021] Figure 2 is Figure 1 Cross-sectional view taken along X-X in;

[0022] Figure 3 is Figure 2 Enlarged view of the structure at A in;

[0023] Figure 4 is Figure 2 Enlarged view of the structure at B in;

[0024] Figure 5 Exploded view of an auxiliary core sampling device for geological exploration engineering provided by an embodiment of the present invention;

[0025] Figure 6 Schematic structural view of the inner tube in an auxiliary core sampling device for geological exploration engineering provided by an embodiment of the present invention;

[0026] Figure 7 Schematic structural view of the mounting seat in an auxiliary core sampling device for geological exploration engineering provided by an embodiment of the present invention;

[0027] Figure 8 Side view of the mounting seat in an auxiliary core sampling device for geological exploration engineering provided by an embodiment of the present invention;

[0028] Figure 9 is Figure 8 Cross-sectional view taken along Y-Y in;

[0029] Figure 10 Schematic structural view of the disc spring assembly in an auxiliary core sampling device for geological exploration engineering provided by an embodiment of the present invention.

[0030] Wherein:

[0031] 100. Fishing tool; 101. Hook; 200. Outer tube; 201. Drill bit; 202. Thrust surface; 300. Inner tube; 301. Clamping rod; 304. Second disc spring; 305. Mounting seat; 3051. Positioning step; 3052. Convex ring; 306. First disc spring; 3061. Rotating disc spring; 3062. First spring; 3063. Second spring; 307. Thrust ring; 3071. Outer conical surface. Detailed implementation manner

[0032] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The "connection" and "coupling" mentioned in the present invention, unless otherwise specifically stated, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention.

[0034] In the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0035] Such as Figures 1 to 10As shown in the figure, an auxiliary core sampling device for geological exploration engineering provided by an embodiment of the present invention includes an outer tube 200. A drill bit 201 is provided at the end of the outer tube 200. The drill bit 201 is used to drill and sample the core. An inner tube 300 is provided inside the outer tube 200. A mounting seat 305 is coaxially provided at one end of the inner tube 300 close to the drill bit 201. A disc spring assembly and a thrust ring 307 are slidably provided inside the mounting seat 305. The thrust ring 307 is clamped at the end of the mounting seat 305. The disc spring assembly includes at least two first disc springs 306 arranged in sequence along the axial direction of the mounting seat 305. The concave surfaces of the first disc springs 306 all face the thrust ring 307. One of the at least two first disc springs 306 is in contact with the thrust ring 307. The concave surfaces of the remaining first disc springs 306 are all connected with a rotating disc spring 3061 through an elastic member. The inner diameter of the rotating disc spring 3061 is the same as the inner diameter of the first disc spring 306, and the concave surface of the rotating disc spring 3061 is arranged opposite to the concave surface of the first disc spring 306. During the process of drilling and sampling the core, the core can enter the inside of the disc spring assembly and the thrust ring 307. When taking out the core, the outer tube 200 moves axially relative to the inner tube 300 along the mounting seat 305 and presses the thrust ring 307, causing the thrust ring 307 to slide and axially press the disc spring assembly. The first disc spring 306 is compressed and deformed to press the outer peripheral surface of the core. At the same time, the rotating disc spring 3061 will tilt along the axial direction of the mounting seat 305, thereby increasing the friction between the inner peripheral surface of the rotating disc spring 3061 and the core. The mounting seat 305 is formed by butting two semi-rings, which is convenient for installing the disc spring assembly.

[0036] In this way, when taking out the core, not only the first disc spring 306 will be compressed and deformed to press the outer peripheral surface of the core, but also the rotating disc spring 3061 will tilt. The tilted rotating disc spring 3061 will generate a normal pressure on a local area of the outer peripheral surface of the core, thereby increasing the friction between the rotating disc spring 3061 and the core, further clamping the core, and avoiding the core slipping in the inner tube 300 and detaching from the inner tube 300 when the core is broken off, ensuring the core sampling efficiency.

[0037] Furthermore, the elastic member includes a first spring 3062 and a second spring 3063. The straight line where the connection line of the first spring 3062 and the second spring 3063 is located is parallel to the diameter of the first disc spring 306. The first spring 3062 and the second spring 3063 have the same length and both extend along the axial direction of the mounting seat 305. The elastic coefficient of the first spring 3062 is less than the elastic coefficient of the second spring 3063.

[0038] Through the design of the first spring 3062 and the second spring 3063, the first disc spring 306 and the rotating disc spring 3061 can remain parallel when the disc spring assembly is not squeezed. When the disc spring assembly is squeezed, due to the different compression lengths of the first spring 3062 and the second spring 3063, the rotating disc spring 3061 is inclined relative to the first disc spring 306. This structure is simple. At the same time, when the disc spring assembly is not squeezed, the first spring 3062 and the second spring 3063 can promote the reset of the rotating disc spring 3061.

[0039] In other embodiments, the elastic member can be set as a first rubber pad and a second rubber pad with different elastic coefficients.

[0040] Further, the disc spring assembly further includes a second disc spring 304. The second disc spring 304 is located on the side of at least two first disc springs 306 away from the pushing ring 307. The size of the second disc spring 304 is the same as that of the first disc spring 306. The convex surface of the second disc spring 304 is arranged opposite to the convex surface of the first disc spring 306. In this way, the inclination direction of the cross section of the first disc spring 306 is opposite to the inclination direction of the cross section of the second disc spring 304. When the first disc spring 306 and the second disc spring 304 are compressed simultaneously, two clamping forces in opposite directions will be generated on the sample core, thereby further preventing the sample core from detaching from the inner tube 300.

[0041] Further, the number of the first disc springs 306 is three. In this way, one of the first disc springs 306 contacts the pushing ring 307, and the other two first disc springs 306 are both connected to the rotating disc spring 3061, enhancing the clamping force of the disc spring assembly on the sample core.

[0042] Further, the number of the second disc springs 304 is one, which can reduce the cost.

[0043] Further, the outer periphery of the rotating disc spring 3061 is oval. In this way, the long axis direction of the rotating disc spring 3061 is more likely to deform, so that the inclination of the rotating disc spring 3061 is easier, and then the rotating disc spring 3061 is easy to clamp the sample core. In other embodiments, the outer peripheral surface of the rotating disc spring 3061 can be set as a circle.

[0044] Further, one end of the outer tube 200 close to the drill bit 201 is provided with a pushing surface 202. One end of the pushing ring 307 facing the drill bit 201 is provided with an outer conical surface 3071. The pushing surface 202 and the outer conical surface 3071 are axially abutted and matched along the mounting seat 305. The pushing surface 202 can be a right-angle step surface or a conical surface.

[0045] Further, a positioning step 3051 is provided on the inner peripheral surface of the end of the mounting seat 305 away from the thrust ring 307, and the disc spring assembly and the positioning step 3051 are axially stopped and matched on the mounting seat 305. This facilitates the positioning and installation of the disc spring assembly.

[0046] Further, a convex ring 3052 is provided on the inner peripheral surface of the end of the mounting seat 305 where the thrust ring 307 is provided. An annular groove is provided on the outer peripheral surface of the thrust ring 307, and the convex ring 3052 can slide axially along the mounting seat 305 in the annular groove. The annular groove limits the sliding range of the thrust ring 307 to avoid excessive extrusion of the disc spring assembly.

[0047] Further, the auxiliary coring device for geological exploration engineering further includes a fishing tool 100 for fishing the inner pipe 300. A clamping rod 301 is provided at the end of the inner pipe 300, and a hook 101 is provided on the fishing tool 100. The hook 101 is clamped and matched with the clamping rod 301.

[0048] Wherein, a ball bearing is provided between the inner pipe 300 and the outer pipe 200, so that the inner pipe 300 remains stationary when the outer pipe 200 rotates. A compression spring is provided between the inner pipe 300 and the outer pipe 200, so that the outer pipe 200 can move relative to the inner pipe 300. The other structures of the inner pipe 300, the outer pipe 200 and the fishing tool 100 belong to the prior art and will not be described in detail here.

[0049] Combined with the above embodiments, the use principle and working process of the embodiments of the present invention are as follows:

[0050] First, install the outer pipe 200 on the drill rig and lower it into the borehole. Stop drilling after the drill bit 201 drills to an appropriate depth. Then, unscrew the outer pipe 200 from the drill rig, insert the inner pipe 300 into the appropriate position inside the outer pipe 200, so that the inner pipe 300 is clamped with the outer pipe 200. Adjust the gap between the inner pipe 300 and the drill bit 201. Then, install the drill rig on the outer pipe 200 again and continue to drill down an appropriate distance. As the drilling process progresses, the core sample gradually enters the inner pipe 300 and gradually enters the inside of the thrust ring 307 and the disc spring assembly. When the detection assembly in the inner pipe 300 detects that the inner pipe 300 is filled with the core sample, the drill bit 201 stops drilling. Then, start the core sampling operation. Drive the outer pipe 200 to move upward through the drill rig. Since a compression spring is provided between the inner pipe 300 and the outer pipe 200, the outer pipe 200 can move upward relative to the inner pipe 300. At this time, the thrust surface 202 of the outer pipe 200 will squeeze the thrust ring 307, causing the thrust ring 307 to squeeze the disc spring assembly. Both the first disc spring 306 and the second disc spring 304 are compressed and deformed to press against the outer peripheral surface of the core sample. At the same time, the rotating disc spring 3061 will tilt along the axial direction of the mounting seat 305, thereby increasing the friction between the inner peripheral surface of the rotating disc spring 3061 and the core sample, so that the rotating disc spring 3061 clamps the core sample. Then, the inner pipe 300 and the outer pipe 200 move upward synchronously to break off the core sample, and the broken core sample is clamped in the inner pipe 300 and is not prone to slipping. Finally, lower the fishing tool 100, so that the hook 101 of the fishing tool 100 is locked with the clamping rod 301 of the inner pipe 300, lift the inner pipe 300 and the core sample inside to the ground, and take out the core sample in the inner pipe 300.

[0051] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0052] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An auxiliary core sampling device for geological exploration engineering, characterized in that, It includes an outer tube, a drill bit is provided at the end of the outer tube, the drill bit is used for drilling a sample core, an inner tube is provided inside the outer tube, a mounting seat is coaxially provided at one end of the inner tube close to the drill bit, a disc spring assembly and a push ring are slidably provided inside the mounting seat, the push ring is clamped at the end of the mounting seat, the disc spring assembly includes at least two first disc springs arranged in sequence along the axial direction of the mounting seat, the concave surfaces of the first disc springs all face the push ring, one of the at least two first disc springs is in contact with the push ring, and the concave surfaces of the remaining first disc springs are all connected with a rotating disc spring through an elastic member, the inner diameter of the rotating disc spring is the same as the inner diameter of the first disc spring, and the concave surface of the rotating disc spring is arranged opposite to the concave surface of the first disc spring; During the process of drilling the sample core, the sample core can enter the inside of the disc spring assembly and the push ring; when taking out the sample core, the outer tube moves axially along the mounting seat relative to the inner tube and squeezes the push ring, so that the push ring slides and axially squeezes the disc spring assembly, the first disc spring is deformed under pressure to tightly press the outer peripheral surface of the sample core, and at the same time the rotating disc spring will tilt axially along the mounting seat, so as to increase the friction between the inner peripheral surface of the rotating disc spring and the sample core. The elastic member includes a first spring and a second spring, the straight line where the first spring and the second spring are connected is parallel to the diameter of the first disc spring, the lengths of the first spring and the second spring are the same and both extend along the axial direction of the mounting seat, and the elastic coefficient of the first spring is less than the elastic coefficient of the second spring.

2. The auxiliary core sampling device for geological exploration engineering according to claim 1, wherein, The disc spring assembly further includes a second disc spring, the second disc spring is located on the side of the at least two first disc springs away from the push ring, the size of the second disc spring is the same as the size of the first disc spring, and the convex surface of the second disc spring is arranged opposite to the convex surface of the first disc spring.

3. The auxiliary core sampling device for geological exploration engineering according to claim 1 or 2, characterized in that, The number of the first disc springs is three.

4. The auxiliary core sampling device for geological exploration engineering according to claim 2, characterized in that, The number of the second disc springs is one.

5. The auxiliary core sampling device for geological exploration engineering according to claim 1, wherein, The outer periphery of the rotating disc spring is oval.

6. The auxiliary core sampling device for geological exploration engineering according to claim 1, wherein, A push surface is provided at one end of the outer tube close to the drill bit, an outer conical surface is provided at one end of the push ring facing the drill bit, and the push surface and the outer conical surface are axially abutted and matched along the mounting seat.

7. The auxiliary core sampling device for geological exploration engineering according to claim 1, characterized in that, A positioning step is provided on the inner peripheral surface of the end of the mounting seat away from the push ring, and the disc spring assembly and the positioning step are axially abutted and matched in the mounting seat.

8. The auxiliary core sampling device for geological exploration engineering according to claim 1, characterized in that, A convex ring is provided on the inner peripheral surface of the end of the mounting seat provided with the push ring, a circular groove is provided on the outer peripheral surface of the push ring, and the convex ring can slide axially in the circular groove along the mounting seat.

9. The auxiliary core sampling device for geological exploration engineering according to claim 1, characterized in that, It further includes a fishing tool for fishing the inner tube, a clamping rod is provided at the end of the inner tube, and a hook is provided on the fishing tool, and the hook is clamped and matched with the clamping rod.

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