A device for recovering a rock sample in a confining pressure device and a method of recovering a rock sample

Abstract

The application discloses a device for recovering rock samples in a confining pressure device and a method for recovering rock samples, relates to the technical field of Hopkinson bar impact compression tests, and comprises a collecting box body, a drawer structure and a buffer structure. The collecting box body is provided with a first through hole, a second through hole for the incident rod to pass through is formed in the collecting box body, a collecting groove is arranged in the collecting box body, and the second through hole is communicated with the collecting groove. The buffer structure is located in the collecting box body and corresponds to the position of the first through hole in a position corresponding manner. The drawer structure is slidably connected with the collecting box body, the first drawer through hole is arranged in the drawer structure and corresponds to the second through hole, the drawer structure is provided with a through groove, the through groove corresponds to the collecting groove, and the through groove is communicated with the first drawer through hole and the collecting groove respectively. The application can meet the safety regulations of the laboratory, ensure the safety of the experimental personnel and experimental equipment, and does not affect the subsequent analysis of the crushing state and the crushing particle size of the samples.

Description

Technical Field

[0001] This invention relates to the field of Hopkinson bar impact compression testing technology, and in particular to an apparatus and method for recovering rock samples from a confining pressure device. Background Technology

[0002] When conducting Hopkinson bar impact compression tests on disc-shaped specimens made of rock or concrete, the fragmentation property of these materials—meaning the volume of the fragmented specimen is larger than the volume of the intact specimen before failure—can cause the fragmented specimen to become stuck in the confining pressure device and become impossible to remove. Currently, there are two methods for removing fragmented specimens: the first involves extending the drill bit to the specimen to break it up, then impacting and crushing the stuck specimen before collecting the fragmented particles; the second method involves using a lower impact pressure than in a normal test for a secondary impact, followed by collecting the fragmented particles.

[0003] As can be seen from the above two sampling methods after fragmentation, both methods have certain drawbacks. The first method, which uses an electric drill to extend the drill bit to break the sample, will destroy the original damage morphology of the sample after the first normal impact test, affecting the subsequent analysis of the damage morphology and particle size. The second method, which uses low impact air pressure for secondary impact, can compensate for the severe secondary damage to the sample after fragmentation in the first method, but currently this method cannot collect the sample after the secondary impact. The sample will be thrown away, and the flying fragments will be scattered throughout the laboratory, which cannot meet the safety regulations in the laboratory, and it is also impossible to perform particle size analysis on the incompletely collected sample. Summary of the Invention

[0004] The purpose of this invention is to provide an apparatus and method for recovering rock samples from a confining pressure device, which meets laboratory safety regulations, ensures the safety of experimental personnel and equipment, and does not affect subsequent analysis of the fragmentation state and particle size of the sample.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides a device for recovering rock samples from a confining pressure device, comprising a collection box, a drawer structure, and a buffer structure. The collection box has a first through hole for connecting to a fixed steel rod in a Hopkinson bar impact compression test system, a second through hole for an incident rod to pass through, and a collection groove, with the second through hole communicating with the collection groove. The buffer structure is located within the collection box and corresponds to the position of the first through hole. The drawer structure is slidably connected to the collection box, and has a first drawer through hole corresponding to the second through hole. The drawer structure also has a through groove corresponding to the collection groove, communicating with both the first drawer through hole and the collection groove.

[0007] Preferably, the buffer structure includes a blocking plate and a spring, one end of the spring being connected to the collection box and the other end of the spring being connected to the blocking plate.

[0008] Preferably, the drawer structure is provided with a second drawer through hole, the second drawer through hole corresponds to and communicates with the first drawer through hole, and the buffer structure can be located in the second drawer through hole.

[0009] Preferably, the drawer structure is provided with a handle.

[0010] Preferably, the size of the second through hole is larger than the size of the incident rod.

[0011] Preferably, the size of the first drawer through-hole is equal to the size of the incident rod.

[0012] Preferably, the collection box includes an upper structure and a lower structure, the upper structure is located above the lower structure, the lower structure is provided with a fixing structure, the upper structure and the lower structure are fixed by a connecting strap, and the connecting strap is connected to the fixing structure. After the upper structure and the lower structure are fastened together, the first through hole is formed, and the second through hole and the collection groove are both located in the lower structure.

[0013] The present invention also provides a method for recovering rock samples using the aforementioned device for recovering rock samples from a confining pressure device, comprising the following steps:

[0014] Step 1: Install the buffer structure into the collection box;

[0015] Step 2: Install the collection box onto the fixed steel rod of the Hopkinson bar impact compression test system, insert the drawer structure into the collection box, and fix the collection box in place;

[0016] Step 3: Set the required air pressure value for the impact in the Hopkinson bar impact compression test system, and start air intake after the test personnel have withdrawn;

[0017] Step 4: After the air intake is complete, turn on the speed measurement system. When the experimenter clicks the fire button, the bullet hits the incident rod, and the incident rod hits the sample that cannot be removed from the confining pressure device due to fragmentation.

[0018] Step 5: The sample is ejected from the confining pressure device into the collection box, and then enters the paper pad of the collection trough through the drawer structure;

[0019] Step Six: After the sample dust dissipates, the experimenters separate the device used to recover the rock sample from the confining pressure device and remove the paper pad and sample particles on the paper pad from the collection trough.

[0020] Step 7: Take photos, sieve, and analyze the particle size of the sample particles after they are removed. Then, put the sample particles into a transparent storage bag with a number on it for storage.

[0021] The present invention achieves the following technical effects compared to the prior art:

[0022] The semi-circular through slots in the upper and lower structures of this invention allow the device to be easily and quickly installed on the Hopkinson bar impact compression testing system. It can be installed as needed and occupies minimal space, making it convenient for laboratory storage.

[0023] The fixing structure on the side of the lower structure of the present invention is rigidly fixed (screws) and connected to the lower structure. After the upper and lower structures are installed, it is used to fix the entire collection box with a connecting strap to ensure the integrity of the device when recovering fragmented samples under low air pressure impact.

[0024] The design of the buffer structure in the collection box of the present invention can ensure that the energy of the incident rod will be depleted here during the sample recovery process, thereby ensuring the safety of the recovery process.

[0025] The drawer structure of this invention facilitates the recovery of broken samples after a low-pressure secondary impact. That is, after a low-pressure impact, the drawer structure can be opened to recover the sample particles in the collection tank. The design of the slanted slit also allows the particles to be recovered to the greatest extent possible, which is convenient for subsequent sample particle size analysis.

[0026] This invention meets laboratory safety regulations, ensures the safety of experimental personnel and equipment, and does not affect subsequent analysis of the fragmentation state and particle size of the samples. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram illustrating the application of the device of the present invention for recovering rock samples from a confining pressure device;

[0029] Figure 2 Transparent diagram showing the application of the apparatus for recovering rock samples from a confining pressure device according to the present invention;

[0030] Figure 3 This is a schematic diagram of the upper structure of the present invention;

[0031] Figure 4 This is a transparent view of the upper structure of the present invention;

[0032] Figure 5 This is a schematic diagram of the lower structure of the present invention;

[0033] Figure 6 This is a transparent view of the lower structure of the present invention;

[0034] Figure 7 This is a schematic diagram of the interior of the collection box of the present invention;

[0035] Figure 8 This is a schematic diagram of the buffer structure of the present invention;

[0036] Figure 9 This is a schematic diagram of the fixing structure of the present invention;

[0037] Figure 10 This is a schematic diagram of the drawer structure of the present invention;

[0038] Figure 11 This is a schematic diagram of the handle of the present invention;

[0039] Figure 12 This is a transparent view of the drawer structure of the present invention;

[0040] Figure 13 This is a schematic diagram of the internal structure of the drawer of the present invention;

[0041] Wherein: 100- Device for recovering rock samples from the confining device, 200- Bullet, 300- Incident rod, 400- Confining device, 500- Fixed steel rod, 1- Collection box, 2- Drawer structure, 3- Semi-circular through groove, 4- Second through hole, 5- Collection groove, 6- First drawer through hole, 7- Upper structure, 8- Lower structure, 9- Fixed structure, 10- Blocking plate, 11- Spring, 12- Handle, 13- Through groove, 14- Second drawer through hole, 15- Storage hole. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] The purpose of this invention is to provide an apparatus and method for recovering rock samples from a confining pressure device, which meets laboratory safety regulations, ensures the safety of experimental personnel and equipment, and does not affect subsequent analysis of the fragmentation state and particle size of the sample.

[0044] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] Example 1

[0046] like Figures 1 to 13 As shown: This embodiment provides a device 100 for recovering rock samples from a confining pressure device, including a collection box 1, a drawer structure 2, and a buffer structure. The collection box 1 is provided with a first through hole for connecting to a fixed steel rod 500 in a Hopkinson bar impact compression test system. The size of the first through hole is the same as the size of the fixed steel rod 500 to ensure the stability of the device in subsequent fixation. The collection box 1 is provided with a second through hole 4 for the incident rod 300 to pass through. The collection box 1 is provided with a collection groove 5, and the second through hole 4 communicates with the collection groove 5. The buffer structure is located in the collection box 1, and the position of the buffer structure corresponds to the first through hole. The drawer structure 2 is slidably connected to the collection box 1. The drawer structure 2 is provided with a first drawer through hole 6, which corresponds to the second through hole 4. The drawer structure 2 is provided with a through groove 13, which corresponds to the collection groove 5 and communicates with both the first drawer through hole 6 and the collection groove 5.

[0047] Specifically, in this embodiment, the collection box 1 includes an upper structure 7 and a lower structure 8. The upper structure 7 is located above the lower structure 8. A fixing structure 9 is provided on the lower structure 8. The upper structure 7 and the lower structure 8 are fixed by a connecting strap, and the hole on the connecting strap is connected to the fixing structure 9. The fixing structure 9 is connected to the lower structure 8 by bolts. The upper structure 7 and the lower structure 8 are respectively provided with semi-circular through grooves 3. After the upper structure 7 and the lower structure 8 are fastened together, the two semi-circular through grooves 3 form a first through hole. The second through hole 4 and the collection groove 5 are both located in the lower structure 8. The collection groove 5 is in the shape of a quadrangular frustum. The cross-section of the collection groove 5 is trapezoidal. The bottom surface of the collection groove 5 faces upward. The length of the bottom surface of the collection groove 5 is 40cm and the width is 22cm. The height of the collection groove 5 is 5cm. A paper pad can be placed in the collection groove 5. After the low-pressure impact, the crushed sample particles finally fall onto the paper pad. After the process is completed, the sample is moved to the subsequent photography, analysis and storage location through the paper pad. The collection box 1 adopts a modular, assembly-type structure, which is simple, efficient, and convenient in production, field application, and laboratory storage. After the upper structure 7 and lower structure 8 are installed on the fixed steel rod 500, the device is prevented from being damaged by subsequent low-pressure secondary impacts. After the lower structure 8 and upper structure 7 are installed and the drawer structure 2 is inserted, the upper structure 7 and lower structure 8 are bound together with leather connecting straps, and then the connecting straps are connected to the fixed structure 9.

[0048] In this embodiment, the lower structure 8 has a trapezoidal groove for placing the drawer structure 2. The upper base of the trapezoidal groove is 35cm, the lower base is 25cm, and the height is 20cm. The dimensions of the groove match the drawer structure 2.

[0049] In this embodiment, a storage hole 15 is also provided in the lower structure 8. The storage hole 15 is used to store the bullet 200, and the bullet 200 after the experiment can be stored in the storage hole 15.

[0050] In this embodiment, the diameter of the second through hole 4 depends on the diameter of the incident rod 300. When recovering the crushed rock sample or concrete material sample by secondary impact, in order to facilitate the incident rod 300 and the crushed sample to be driven into the collection box 1, the diameter of the second through hole 4 can be slightly larger than the diameter of the incident rod 300 by 2 to 3 mm.

[0051] In this embodiment, the collection box 1 is also provided with a placement slot for placing a buffer structure. The buffer structure includes a blocking plate 10 and a spring 11. The blocking plate 10 is a steel sheet, one end of the spring 11 is connected to the collection box 1, and the other end of the spring 11 is connected to the blocking plate 10. When the energy of the incident rod 300 is too large, the buffer structure can offset most of the energy, preventing damage to the device or the occurrence of dangerous working conditions in the laboratory.

[0052] In this embodiment, the drawer structure 2 has a trapezoidal cross-section and a handle 12 is provided on the drawer structure 2. The handle 12 is used to remove the drawer structure 2 after low-pressure impact to recover the particles after the sample is damaged. The drawer structure 2 is provided with a second drawer through hole 14. The size of the second drawer through hole 14 is smaller than the size of the first drawer through hole 6. The size of the second drawer through hole 14 is the same as or slightly larger than the size of the blocking plate 10. The size of the first drawer through hole 6 is equal to or slightly larger than the size of the incident rod 300. The second drawer through hole 14 corresponds to and is connected to the first drawer through hole 6. The buffer structure can be located in the second drawer through hole 14.

[0053] This embodiment meets the laboratory's safety regulations, ensures the safety of experimental personnel and equipment, and does not affect subsequent analysis of the sample's breakage state and particle size.

[0054] The semi-circular through slots 3 of the upper structure 7 and the lower structure 8 allow the device to be easily and quickly installed on the Hopkinson bar impact compression test system. It can be installed as needed and occupies minimal space, making it convenient for laboratory storage.

[0055] The fixing structure 9 on the side of the lower structure 8 is rigidly fixed (screws) and connected to the lower structure 8. After the upper structure 7 and the lower structure 8 are installed, it is used to fix the entire collection box 1 with connecting straps to ensure the integrity of the device when recovering fragmented samples under low air pressure impact.

[0056] The design of the buffer structure in the collection box 1 ensures that the energy of the incident rod 300 will be depleted here during the sample recovery process, thus ensuring the safety of the recovery process.

[0057] The drawer structure 2 facilitates the recovery of broken samples after a low-pressure secondary impact. After the low-pressure impact, the drawer structure 2 can be opened to recover the sample particles in the collection tank 5. The collection tank 5 is shaped like a truncated pyramid with its bottom facing upward, allowing the particles to slide down the side wall of the collection tank 5 into the collection tank, so that the particles are recovered to the greatest extent possible, which is convenient for subsequent sample particle size analysis.

[0058] Example 2

[0059] This embodiment provides a method for recovering rock samples using the device 100 from the confining pressure device described in Embodiment 1, comprising the following steps:

[0060] Step 1: Install the buffer structure into the placement slot of the collection box 1. The connection method between the spring 11 and the barrier plate should ensure that the weight of the barrier plate and the spring 11 will not cause vertical strain in the spring 11. That is, after the spring 11 and the barrier plate are combined and installed, they should maintain a stable vertical position before being subjected to external forces. Figure 8 The state in;

[0061] Step 2: Install the collection box 1 on the fixed steel rod 500 of the Hopkinson bar impact compression test system. After the upper structure 7 and the lower structure 8 are installed, insert the drawer structure 2 into the collection box 1 and tie the collection box 1 with the connecting strap.

[0062] Step 3: Set the required air pressure value for the impact in the Hopkinson bar impact compression test system, and start air intake after the test personnel have withdrawn;

[0063] Step 4: After the air intake is complete, turn on the speed measurement system. When the experimenter clicks the launch button, the bullet 200 is rushed out of the high-pressure air chamber according to the predetermined air pressure, and then hits the incident rod 300. The incident rod 300 hits the sample that cannot be removed due to fragmentation in the confining pressure device 400.

[0064] Step 5: The sample is ejected from the confining pressure device 400 into the collection box 1. According to the design path, the particles after the sample is broken pass through the second through hole 4, the first drawer through hole 6, and the groove 13, and fall onto the paper pad in the collection groove 5.

[0065] Step 6: After the sample dust generated by the secondary low-pressure impact dissipates, the experimenter loosens the connecting belt, separates the device 100 used to recover the rock sample in the confining pressure device, and removes the paper pad and sample particles on the paper pad at the collection tank 5.

[0066] Step 7: Take photos, sieve, and analyze the particle size of the sample particles after taking them out. Then, put the sample particles into a transparent storage bag with a number written on it, which was prepared before the experiment, for storage.

[0067] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for recovering rock samples, characterized in that: An apparatus for recovering rock samples from a confining pressure device is employed. This apparatus includes a collection box, a drawer structure, and a buffer structure. The collection box has a first through-hole for connecting to a fixed steel rod in a Hopkinson bar impact compression test system. The collection box also has a second through-hole for the incident rod to pass through. A collection groove is provided in the collection box, and the second through-hole communicates with the collection groove. The buffer structure is located within the collection box and corresponds to the position of the second through-hole. The drawer structure is slidably connected to the collection box. The drawer structure has a first drawer through-hole corresponding to the second through-hole, and a passage groove corresponding to the collection groove. The passage groove communicates with both the first drawer through-hole and the collection groove. The buffer structure includes a blocking plate and a spring, one end of the spring being connected to the collection box and the other end of the spring being connected to the blocking plate; The drawer structure is provided with a second drawer through hole, which corresponds to and communicates with the first drawer through hole, and the buffer structure can be located in the second drawer through hole; The method for recovering rock samples includes the following steps: Step 1: Install the buffer structure into the collection box; Step 2: Install the collection box onto the fixed steel rod of the Hopkinson bar impact compression test system, insert the drawer structure into the collection box, and fix the collection box in place; Step 3: Set the required air pressure value for the impact in the Hopkinson bar impact compression test system, and start air intake after the test personnel have withdrawn; Step 4: After the air intake is complete, turn on the speed measurement system. When the experimenter clicks the fire button, the bullet hits the incident rod, and the incident rod hits the sample that cannot be removed from the confining pressure device due to fragmentation. Step 5: The sample is ejected from the confining pressure device into the collection box, and then enters the paper pad of the collection trough through the drawer structure; Step Six: After the sample dust dissipates, the experimenters separate the device used to recover the rock sample from the confining pressure device and remove the paper pad and sample particles on the paper pad from the collection trough. Step 7: Take photos, sieve, and analyze the particle size of the sample particles after they are removed. Then, put the sample particles into a transparent storage bag with a number on it for storage.

2. The method for recovering rock samples according to claim 1, characterized in that: The drawer structure is equipped with a handle.

3. The method for recovering rock samples according to claim 1, characterized in that: The size of the second through hole is larger than the size of the incident rod.

4. The method for recovering rock samples according to claim 1, characterized in that: The size of the first drawer through hole is equal to the size of the incident rod.

5. The method for recovering rock samples according to claim 1, characterized in that: The collection box includes an upper structure and a lower structure. The upper structure is located above the lower structure. A fixing structure is provided on the lower structure. The upper structure and the lower structure are fixed by a connecting strap, and the connecting strap is connected to the fixing structure. After the upper structure and the lower structure are fastened together, a first through hole is formed. The second through hole and the collection groove are both located in the lower structure.

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