Soft geological sampling device for geophysical exploration

Abstract

The utility model discloses a geophysical exploration soft geology sampling device which comprises a hollow shaft motor and a coring cylinder, the left side and the right side of a shell of the hollow shaft motor are respectively provided with a pressing handle, a main shaft of the hollow shaft motor is a vertically-through hollow main shaft, and an inner hole of the hollow main shaft is coaxially provided with a driving shaft through a spline structure. The lower end of the driving shaft is coaxially and fixedly connected with the upper end of the coring cylinder, the upper end of the driving shaft extends out of the upper end of the hollow spindle, and a detachable fastening assembly is arranged on the outer circle of the upper end of the driving shaft and connected with the upper end of the hollow spindle. The drilling and coring device is scientific in principle and convenient to operate, can be held by hand to perform drilling and coring operation in any direction, is mainly used for sampling soft materials such as soil, riverbeds and coal seams, can be used for sampling slightly hard materials due to the arrangement of the diamond tool bit, and provides a complete cylindrical sample for geophysical exploration operation.

Description

Technical Field

[0001] This utility model belongs to the field of geophysical exploration technology, specifically relating to a geophysical exploration soft geological sampling device. Background Technology

[0002] Geophysical exploration, or geophysical prospecting for short, refers to the study and observation of changes in various geophysical fields to detect geological conditions such as strata lithology and geological structures. Patent No. 202120534075.3 (Authorization Announcement No.: CN214952250U) discloses a geophysical exploration vehicle with borehole sampling function, but its technical solution has the following problems or shortcomings:

[0003] 1) The fixed installation box of the sampling part is fixed on the front side of the exploration vehicle. It can only drill and sample from top to bottom in the areas that the exploration vehicle can move. It cannot sample in areas that the exploration vehicle cannot reach or on the side wall of the mountain, thus limiting the range of drilling and sampling.

[0004] 2) The drilling sampling produces debris. The debris produced by the drilling is mixed together, which is not only troublesome to collect, but also makes it difficult to distinguish the actual depth of the debris in the rock strata and the corresponding layered structure when testing the sample. Utility Model Content

[0005] In order to solve the above-mentioned technical problems in the prior art, this utility model provides a handheld, safe and reliable geophysical exploration soft geological sampling device that can drill cylindrical samples.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a geophysical exploration soft geological sampling device, including a hollow shaft motor and a core tube. A pressing handle is provided on the left and right sides of the outer shell of the hollow shaft motor. The main shaft of the hollow shaft motor is a hollow main shaft that is open at the top and bottom. A drive shaft is coaxially installed in the inner hole of the hollow main shaft through a spline structure. The core tube is a cylindrical structure with an open bottom. The lower end of the drive shaft is coaxially and fixedly connected to the upper end of the core tube. The upper end of the drive shaft extends out of the upper end of the hollow main shaft. A detachable fastening component is provided on the outer circle of the upper end of the drive shaft and connected to the upper end of the hollow main shaft.

[0007] The detachable fastening assembly includes a clamping nut and a lock nut that are threaded onto the outer circle of the upper end of the drive shaft. The lower end of the clamping nut is pressed against the upper end face of the hollow spindle, and the lower end of the lock nut is pressed against the upper end of the clamping nut. The lower outer circle of the drive shaft is fixedly connected to the upper end face of the core barrel by at least three ribs in a circumferential array. The lower end face of the hollow spindle is pressed against the upper end of all the ribs.

[0008] The lower end of the core tube has several mounting slots arranged in a circumferential array on the annular surface. Each mounting slot is equipped with and welded with a diamond cutting head. The maximum rotation diameter of all diamond cutting heads is greater than the outer diameter of the core tube. The inner rotation trajectory of all diamond cutting heads is a conical surface with a smaller top and a larger bottom. The diameter of the end port on the conical surface is equal to the inner diameter of the core tube.

[0009] The outer circumference of the core-taking cylinder is provided with a shallow spiral chip removal groove.

[0010] The drive shaft is a round tube that is open at both ends. The top of the core tube has a central hole that corresponds to the lower end of the drive shaft. A top pressure rod is installed inside the drive shaft. The lower end of the top pressure rod passes through the central hole and is fixedly connected to a push plate located inside the core tube. The push plate is connected to the top of the core tube by at least two positioning bolts. The upper end of the top pressure rod is flush with the upper end of the drive shaft. There are corresponding positioning cuts between the upper ends of the top pressure rod and the upper ends of the top pressure rod.

[0011] The upper end of the drive shaft has an internal threaded hole for connecting the extended push rod.

[0012] Compared with the prior art, the present invention has the following advantages by adopting the above technical solution:

[0013] This invention employs a handheld operation, with a power cord for connecting the hollow shaft motor threaded through one of the push handles. The power cord can be connected to a battery, facilitating field operations. A switch on the push handle controls the start and stop of the hollow shaft motor. The drive shaft is coaxially mounted inside the hollow main shaft and transmits torque through a spline structure. A clamping nut and a lock nut provide axial positioning of the drive shaft. Ribs not only enhance the connection strength between the drive shaft and the core barrel but also engage with the lower end of the hollow main shaft for axial positioning of the drive shaft. The lower end of the core sampling tube has evenly spaced mounting grooves on its annular surface, and diamond cutting heads are installed in these grooves. The use of diamond cutting heads improves the efficiency of core sampling. The maximum rotation diameter of the diamond cutting heads is larger than the outer diameter of the core sampling tube, ensuring that the hole wall does not contact the outer diameter of the core sampling tube, facilitating the removal of the core sampling tube after core extraction. The inner rotation trajectory of all diamond cutting heads is a conical surface, smaller at the top and larger at the bottom, with the diameter of the conical end equal to the inner diameter of the core sampling tube. During core extraction, soft material is compressed and enters the core sampling tube, creating friction between the cylindrical sample and the inner wall of the tube. After core extraction, when lifting the core sampling tube upwards, a slight shaking of the handle breaks the cylindrical sample from the soft material at the lower end of the tube. To remove the cylindrical sample from the core sampling tube, unscrew the positioning bolts, connect the extended push rod to the pressure rod, and drive the pressure rod axially, ultimately causing the pusher to eject the cylindrical sample from the core sampling tube. During drilling and sampling, the pusher plate and core cylinder are fixedly connected as one unit by positioning bolts. When retrieving the cylindrical sample, the positioning bolts are removed to drive the pusher plate to push the cylindrical sample out. This method is convenient to operate and does not occupy the entire space of the soft geological material sampler. The positioning notch design facilitates the screwing in of the positioning bolts, saving operation time.

[0014] In summary, this utility model is based on sound principles and is easy to operate. It can be used for drilling and core sampling by hand in any direction. It is mainly used for sampling soft materials such as soil, riverbeds, and coal seams. Due to the diamond cutting head, it can also sample slightly harder materials, providing complete cylindrical samples for geophysical exploration operations. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the external structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of this utility model after removing the hollow shaft motor. Detailed Implementation

[0017] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0018] like Figures 1-2As shown, the geophysical exploration soft geological sampling device of this utility model includes a hollow shaft motor 1 (existing technology, commercially available, capable of withstanding a certain axial force) and a core tube 2. A pressing handle 3 is provided on the left and right sides of the outer shell of the hollow shaft motor 1. The main shaft of the hollow shaft motor 1 is a hollow main shaft 4 that is open at the top and bottom. A drive shaft 6 is coaxially installed in the inner hole of the hollow main shaft 4 through a spline structure 5. The core tube 2 is a cylindrical structure with an open bottom. The lower end of the drive shaft 6 is coaxially fixedly connected to the upper end of the core tube 2. The upper end of the drive shaft 6 extends out of the upper end of the hollow main shaft 4. A detachable fastening component is provided on the outer circle of the upper end of the drive shaft 6 and connected to the upper end of the hollow main shaft 4.

[0019] The detachable fastening assembly includes a clamping nut 7 and a lock nut 8, both threadedly connected to the outer circle of the upper end of the drive shaft 6. The lower end of the clamping nut 7 is pressed against the upper end face of the hollow spindle 4, and the lower end of the lock nut 8 is pressed against the upper end of the clamping nut 7. The lower outer circle of the drive shaft 6 is fixedly connected to the upper end face of the core barrel 2 by at least three ribs 9 in a circumferential array. The lower end face of the hollow spindle 4 is pressed against the upper ends of all the ribs 9.

[0020] The lower end of the core tube 2 has several mounting slots arranged in a circular array along the circumference. Each mounting slot is equipped with and welded with a diamond cutter head 10 (or a low-cost alloy cutter head). The maximum rotation diameter of all diamond cutter heads 10 is greater than the outer diameter of the core tube 2. The inner circle rotation trajectory of all diamond cutter heads 10 is a conical surface with a smaller upper diameter and a larger lower diameter. The diameter of the end port on the conical surface is equal to the inner diameter of the core tube 2.

[0021] The outer circumference of the core tube 2 is provided with a spiral chip removal shallow groove 11.

[0022] The drive shaft 6 is a round tube that is open at both ends. The top of the core tube 2 has a central hole that is open through the lower end of the drive shaft 6. A top pressure rod 12 is provided inside the drive shaft 6. The lower end of the top pressure rod 12 passes through the central hole and is fixedly connected to a push plate 13 located inside the core tube 2. The push plate 13 is connected to the top of the core tube 2 by at least two positioning bolts 14. The upper end of the top pressure rod 12 is flush with the upper end of the drive shaft 6. A positioning cut 15 is provided between the upper ends of the top pressure rod 12 and the upper ends of the top pressure rod 12.

[0023] The upper center of the drive shaft 6 is provided with an internal threaded hole 16 for connecting the extended push rod.

[0024] The specific working steps of this utility model are as follows:

[0025] 1) Hold one of the pressing handles 3 in each hand and start the hollow shaft motor 1. The hollow main shaft 4 of the hollow shaft motor 1 drives the drive shaft 6 to rotate at high speed through the spline structure 5. The core tube 2, which is coaxially fixedly connected to the hollow main shaft 4, also rotates at high speed. The diamond cutter heads 10 arranged in a circular array at the lower end of the core tube 2 drill into the soft material. The drill cuttings are discharged outward through the spiral chip removal groove 11. The soft material enters the core tube 2 and the sampling is completed. The core tube 2 drills into the soft geology towards the sampling position until the upper part of the core tube 2 is about to enter the borehole. Then, turn off the hollow shaft motor 1 to complete the sampling.

[0026] 2) Remove the cylindrical soft sample from the soft geological material sampler 7. The specific process is as follows: Unscrew the positioning bolt 14, take an extended push rod, insert one end of the extended push rod into the top pressure rod 12 at the upper end of the internal threaded hole 16, and then press the extended push rod down. The push plate 13 is driven to move downward through the top pressure rod 12. The push plate 13 pushes the cylindrical soft sample downward out of the core tube 2. Then pull the reinforcing push rod upward to contact the push plate 13 with the top of the core tube 2, and make the positioning cut 15 between the upper end of the top pressure rod 12 and the upper end of the top pressure rod 12 correspond. At this time, the push plate 13 corresponds to the threaded hole at the top of the core tube 2. Screw the positioning bolt 14 into the threaded hole at the top of the core tube 2 to fix the push plate 13.

[0027] 3) Clean the core barrel 2 in preparation for the next core retrieval.

[0028] The above embodiments illustrate the basic principles and features of this utility model. However, the above descriptions are merely preferred embodiments and are not limited to these embodiments. Those skilled in the art, inspired by this patent, can make many modifications and improvements without departing from the spirit and scope of the claims, all of which fall within the protection scope of this utility model. Therefore, the patent and its scope of protection should be determined by the appended claims.

Claims

1. A device for sampling soft geology in geophysical exploration, characterised in that: It includes a hollow shaft motor and a core-taking cylinder. The hollow shaft motor has a pressing handle on each of its left and right sides. The main shaft of the hollow shaft motor is a hollow main shaft that is open at both ends. The drive shaft is coaxially installed in the inner hole of the hollow main shaft through a spline structure. The core-taking cylinder is a cylindrical structure with an open bottom. The lower end of the drive shaft is coaxially and fixedly connected to the upper end of the core-taking cylinder. The upper end of the drive shaft extends out of the upper end of the hollow main shaft. The outer circle of the upper end of the drive shaft is provided with a detachable fastening component that is connected to the upper end of the hollow main shaft.

2. The geophysical exploration soft geological sampling device according to claim 1, characterized in that: The detachable fastening assembly includes a clamping nut and a lock nut that are threaded onto the outer circle of the upper end of the drive shaft. The lower end of the clamping nut is pressed against the upper end face of the hollow spindle, and the lower end of the lock nut is pressed against the upper end of the clamping nut. The lower outer circle of the drive shaft is fixedly connected to the upper end face of the core barrel by at least three ribs in a circumferential array. The lower end face of the hollow spindle is pressed against the upper end of all the ribs.

3. The geophysical exploration soft geological sampling device according to claim 1 or 2, characterized in that: The lower end of the core tube has several mounting slots arranged in a circumferential array on the annular surface. Each mounting slot is equipped with and welded with a diamond cutting head. The maximum rotation diameter of all diamond cutting heads is greater than the outer diameter of the core tube. The inner rotation trajectory of all diamond cutting heads is a conical surface with a smaller top and a larger bottom. The diameter of the end port on the conical surface is equal to the inner diameter of the core tube.

4. The geophysical exploration soft geological sampling device according to claim 1 or 2, characterized in that: The outer circumference of the core-taking cylinder is provided with a shallow spiral chip removal groove.

5. The geophysical exploration soft geological sampling device according to claim 1 or 2, characterized in that: The drive shaft is a round tube that is open at both ends. The top of the core tube has a central hole that corresponds to the lower end of the drive shaft. A top pressure rod is installed inside the drive shaft. The lower end of the top pressure rod passes through the central hole and is fixedly connected to a push plate located inside the core tube. The push plate is connected to the top of the core tube by at least two positioning bolts. The upper end of the top pressure rod is flush with the upper end of the drive shaft. There are corresponding positioning cuts between the upper ends of the top pressure rod and the upper ends of the top pressure rod.

6. The geophysical exploration soft geological sampling device according to claim 5, characterized in that: The upper end of the drive shaft has an internal threaded hole for connecting the extended push rod.

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