Portable sampling and cutting instrument for manufacturing standardized point load test piece

Abstract

The utility model discloses a portable sampling cutting instrument for manufacturing a standardized point load test piece, which comprises a hammer body and a handle body, and is characterized in that the left side and the right side of the front end of the hammer body are respectively provided with a rectangular convex block extending forwards, a fixed beam is arranged between the inner walls of the two rectangular convex blocks, the fixed beam is provided with a cutting assembly with an adjustable distance, and the cutting assembly is connected with the handle body. The cutting assembly comprises two cutting edges installed on the two sides of the top and the bottom of the fixed beam respectively. Adjusting pieces used for adjusting the distance between the cutting edges are arranged between the cutting edges and the corresponding side faces of the fixed beam. The handle body can be installed horizontally or vertically. The utility model aims to solve the problems that the qualified rate of a manufactured test piece is greatly reduced and the error of a test result is larger as the surface of a rock sample is uneven and the stress spacing is difficult to accurately measure during underground sampling of a mine, and the problem that the operation is inconvenient in a sampling process in a specific trend (such as vertical bedding and oblique joint).

Description

Technical Field

[0001] This utility model relates to the field of geological sample standard specimen processing technology, specifically to a sampling instrument for making standard specimens. Background Technology

[0002] Point load testing is widely used in field testing due to its high tolerance for specimen shape and size. When using point load testing to evaluate the strength properties of rock, the application location of the loading point should meet the stress spacing requirements, i.e., it should be placed at the thinnest part of the specimen as much as possible. However, when sampling in the underground mining environment, the uneven rock surface makes it difficult to accurately measure the stress spacing, which not only greatly reduces the specimen pass rate but may also lead to large errors in the test results. In addition, the varying orientations of underground rock textures make it inconvenient to operate handheld sampling devices when sampling along specific orientations (such as vertical bedding or oblique joints), greatly affecting sampling efficiency. Utility Model Content

[0003] This utility model proposes a portable sampling and cutting instrument for producing standardized point load specimens. Its purpose is to solve the problems of greatly reduced specimen qualification rate and large test result error caused by the uneven surface of rock samples and the difficulty in accurately measuring stress spacing during underground mining sampling, as well as the inconvenience of operation during sampling in specific orientations (such as vertical bedding and oblique joints).

[0004] The technical solution of this utility model is as follows:

[0005] A portable sampling and cutting instrument for fabricating standardized point load specimens includes a hammer body and a handle body connected to each other. The hammer body has forward-extending rectangular protrusions on its left and right front ends. A fixed beam is provided between the inner walls of the two rectangular protrusions. An adjustable-spacing cutting assembly is installed on the fixed beam. The cutting assembly includes two cutting blades installed on the top and bottom sides of the fixed beam. An adjusting element for adjusting the spacing between the cutting blades is provided between the cutting blades and the corresponding sides of the fixed beam.

[0006] As a further improvement to the sampling and cutting instrument, the two cutting blades and the adjusting element are bolted to the fixed beam, and the adjusting element is a rectangular shim.

[0007] As a further improvement to the sampling and cutting instrument, the hammer body has an internal cavity that is connected to a threaded through hole at the top of the hammer body. A cover plate is threaded into the threaded through hole, and the cavity contains a counterweight to reduce the rebound of the hammer body.

[0008] As a further improvement to the sampling and cutting instrument, the counterweight is a counterweight ball or counterweight block, and its volume accounts for 50-70% of the total volume of the cavity.

[0009] As a further improvement to the sampling and cutting instrument, the handle is threadedly connected to the hammer body via a first mounting groove located at the right end of the hammer body or a second mounting groove located at the bottom end of the hammer body.

[0010] As a further improvement to the sampling and cutting instrument, the first and second mounting slots are elongated, and the sidewalls at both ends of their long shafts are provided with spring plates to further reduce the vibration of the hammer.

[0011] As a further improvement to the sampling and cutting instrument, the rectangular protrusion is provided with a scale on its side for calibrating the distance between the two cutting blades.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] (1) This utility model, by setting an adjustable-spacing cutting component, can quickly and in batches produce standard specimens with cutting thicknesses conforming to the stress spacing from collected rock samples, or directly produce standard specimens from underground sampling points such as roadway faces or working faces, greatly improving the specimen production efficiency. By changing the installation position of the handle, the cutting direction can be changed to adapt to rock masses with different orientations, enabling convenient and efficient production of qualified standard specimens in mines. By setting a scale on the hammer body, the cutting blade spacing can be directly calibrated to ensure that the specimen thickness matches the stress spacing.

[0014] (2) By setting a counterweight in the cavity of the hammer body, this utility model ensures that the hammer body will not vibrate and bounce away when it strikes the rock wall or rock sample, thereby reducing stress damage to the rock sample; furthermore, a spring plate is set at the connection between the handle and the hammer body to offset part of the impact force and further reduce the damage to the specimen. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0016] Figure 2 This is a schematic cross-sectional view of the hammer body in an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of a blade in one embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Hammer body; 11. Fixed beam; 12. Threaded through hole; 13. Cover plate; 14. First mounting groove; 15. Second mounting groove; 16. Spring plate; 17. Scale; 2. Cutting assembly; 21. First cutting blade; 22. Second cutting blade; 23. Adjusting component; 3. Handle. Detailed Implementation

[0020] The technical solution and effects of this utility model will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0021] like Figure 1 A sampling and cutting instrument for making standardized point load specimens is a portable sampling and cutting instrument, which is essentially a sampling hammer, including a hammer body 1 and a handle body 3.

[0022] The handle 3 can be installed horizontally or vertically, that is, the handle 3 can be connected to the hammer 1 through a first mounting groove 14 provided at the right end of the hammer 1 or a second mounting groove 15 provided at the bottom end of the hammer 1. Preferably, the first mounting groove 14 and the second mounting groove 15 are elongated, and the side walls at both ends of their long axis are provided with spring plates 16 for damping the vibration of the hammer 1.

[0023] Combination Figure 2 The hammer body 1 has forward-extending rectangular protrusions on its left and right sides at its front end (i.e., the cutting end), and a fixing beam 11 is provided between the inner walls of the two rectangular protrusions. An adjustable-gap cutting assembly 2 is mounted on the fixing beam 11. The cutting assembly 2 includes two cutting blades respectively mounted on the top and bottom sides of the fixing beam 11. An adjusting element 23 for adjusting the spacing between the cutting blades is provided between the corresponding sides of the cutting blades and the fixing beam 11. The cutting blades and the adjusting element 23 are bolted to the fixing beam 11. Specifically, the adjusting element 23 is a rectangular shim, and the spacing between the cutting blades is adjusted by adjusting the thickness or number of the rectangular shims.

[0024] Furthermore, the cutting blade has various cutting sections of different shapes, and the appropriate shape of the cutting blade can be selected according to the shape requirements of the specimen, such as a straight blade (first cutting blade 21), a trapezoidal cutting blade (second cutting blade 22), or a serrated blade (e.g., Figure 3 (As shown).

[0025] like Figure 1 The cutting end of the hammer body 1 is also equipped with a scale 17, which can directly mark the distance between the two cutting blades to ensure that the specimen thickness matches the stress spacing.

[0026] Furthermore, such as Figure 2 To reduce the rebound caused by the hammer 1 during impact, a cavity is provided inside the hammer 1. The cavity communicates with a threaded through hole 12 at the top of the hammer 1, and a cover plate 13 is threadedly connected to the threaded through hole 12. The cavity contains a counterweight to prevent the hammer 1 from rebounding. The counterweight is a steel block, occupying approximately 60% of the total volume of the cavity, to balance the impact kinetic energy of the hammer 1. The counterweight can be a counterweight ball or a counterweight block.

[0027] When hammer 1 strikes the rock, the rebound force generated is absorbed by the internal counterweights. These counterweights move inside hammer 1, converting the rebound force into internal kinetic energy, thereby greatly reducing the rebound of hammer 1 and minimizing damage to the specimen. Simultaneously, due to the presence of the internal counterweights, hammer 1 also effectively reduces vibration during impact, further reducing damage to the specimen.

[0028] When using the instrument described in this embodiment to prepare standardized specimens, the collected rock samples can be processed quickly, and standard specimens can be quickly prepared in batches at underground sampling points such as tunnel faces or working face sections for testing. Afterwards, the average value obtained after removing outliers using statistical methods is closer to the physical strength of the rock samples.

[0029] The steps for preparing standard specimens using this embodiment are as follows:

[0030] 1. Determine the stress spacing value, i.e. the distance between the upper and lower surfaces of the specimen, according to the experimental purpose and test requirements, and adjust the distance between the cutting blades accordingly.

[0031] 2. For the rock samples that have already been collected, standard specimens that meet the requirements can be obtained by striking them with the cutting end of hammer 1.

[0032] 3. During on-site sampling, the handle 3 is connected and fixed to the hammer 1 via the first mounting groove 14 or the second mounting groove 15, depending on the texture of the rock mass. This ensures that the cutting direction aligns with the rock mass texture, preventing specimen breakage due to uneven stress. For example, if the rock mass texture is horizontally distributed, the handle 3 is connected to the hammer 1 via the second mounting groove 15; if the texture is vertically distributed, it is connected via the first mounting groove 14.

[0033] 4. Loosen the cutting component 2, remove the specimen, put it into a sampling bag, label it, and make a record.

[0034] Repeat the above cutting steps until the required rock specimens are collected.

[0035] It should be noted that, as will be apparent to those skilled in the art, this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. The scope of this utility model is defined by the claims rather than the foregoing description.

Claims

1. A portable sampling and cutting apparatus for making a standardized point load test specimen, comprising a hammer body (1) and a handle body (3) connected to each other, characterized in that: The hammer body (1) is provided with a rectangular protrusion extending forward on each of the left and right sides of the front end, and a fixed beam (11) is arranged between the inner walls of the two rectangular protrusions, and an adjustable cutting assembly (2) is mounted on the fixed beam (11), wherein the cutting assembly (2) comprises two cutting blades mounted on the top and bottom sides of the fixed beam (11) respectively, and an adjusting member (23) is arranged between the cutting blades and the corresponding side surfaces of the fixed beam (11) to adjust the distance between the cutting blades.

2. The sampling and cutting apparatus for portable fabrication of a standardized point load test specimen of claim 1, wherein: The two cutting blades and the adjusting member (23) are mounted on the fixed beam (11) by bolts, and the adjusting member (23) is a rectangular gasket.

3. The sampling and cutting apparatus for portable fabrication of a standardized point load test specimen of claim 1, wherein: The hammer body (1) is internally provided with a cavity, the cavity is in communication with a threaded through hole (12) at the top of the hammer body (1), a cover plate (13) is threadedly connected in the threaded through hole (12), and a counterweight is arranged in the cavity to reduce the rebound of the hammer body (1).

4. The sampling and cutting apparatus for portable fabrication of a standardized point load test specimen of claim 3, wherein: The counterweight is a counterweight ball or a counterweight block, and the volume of the counterweight accounts for 50-70% of the total volume of the cavity.

5. The sampling and cutting apparatus for portable fabrication of a standardized point load test specimen of claim 1, wherein: The handle body (3) is threadedly connected with the hammer body (1) through a first mounting groove (14) arranged at the right end of the hammer body (1) or a second mounting groove (15) arranged at the bottom end of the hammer body (1).

6. The sampling and cutting apparatus for portable fabrication of a standardized point load test specimen of claim 5, wherein: The first mounting groove (14) and the second mounting groove (15) are long strip-shaped, and the side walls at both ends of the long axis are provided with spring sheets (16) for further reducing the vibration of the hammer body (1).

7. A sampling and cutting apparatus for portable production of standardized point load specimens as claimed in any one of claims 1 to 6, characterized in that: The side surface of the rectangular protrusion is provided with a scale ruler (17) for marking the distance between the two cutting blades.

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