A single-particle full-coverage loading device

Abstract

This invention discloses a single-particle full-coverage loading device, belonging to the technical field of geotechnical engineering experimental equipment. The invention includes a uniaxial loading head, a clamping plate, a support platform, a full-coverage loading head, and a sensor assembly. A first mounting hole is provided on one side of the top of the clamping plate, and a second mounting hole is provided on the other side of the top of the clamping plate. This invention measures the mechanical properties of a single-particle model under complex stress conditions with full coverage by applying different loads. The single-particle full-coverage loading device is based on a three-dimensional needle-carved structure, expanding the loading methods for single particles. Different loading methods for a single particle, such as point loads and planar loads, will cause the single particle to exhibit different mechanical behaviors. This device can achieve multi-point full-coverage loading of a single particle through the single-particle full-coverage loading head, thereby observing the mechanical behavior of the single particle, greatly expanding the analysis and research of the mechanical behavior of single particles.

Description

Technical Field

[0001] This invention belongs to the technical field of geotechnical engineering experimental equipment, and in particular relates to a single-particle full-coverage loading device. Background Art

[0002] Natural cemented sand, as a typical structural soil material, is widely used in practical engineering. Currently, most research on the mechanical behavior of cemented sand remains at the macroscopic level, lacking an understanding of its internal particle interaction mechanisms, and the connection between the fragmentation behavior of cemented sand at the particle scale and its macroscopic mechanical response remains unclear. This fundamentally limits a comprehensive understanding of cemented sand and other structural soils. Only by deeply understanding the evolution of the internal structure and damage mechanisms of cemented sand, moving from phenomena to essence and from macroscopic to microscopic levels, can we propose fundamental preventative measures to address related disasters in practical engineering. Therefore, conducting research on the fragmentation modes and microscopic damage mechanisms of cemented sand particles, and mastering the true mechanical properties of microscopic cemented sand particles, has significant theoretical and practical value for further improving the multi-scale mechanical mechanism research of structural soils and even for geotechnical engineering construction.

[0003] Different loading methods for single particles yield drastically different experimental results. For example, different loading methods for a single particle, such as single point load or plane load, will cause the single particle to exhibit different mechanical behaviors. Research on full-coverage loading of single particles is of great significance. However, existing single-particle loading devices cannot be applied to multiple types of particles and have a single loading method, which reduces the overall practicality of the device.

[0004] To address these issues, we provide a single-particle full-coverage loading device. Summary of the Invention

[0005] The purpose of this invention is to provide a single-particle full-coverage loading device, which solves the problem that existing single-particle loading devices cannot be applied to various types of particles and have a limited range of single-particle loading methods by using a combination of a single-axis loading head and a full-coverage loading head.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution.

[0007] This invention relates to a single-particle full-coverage loading device, comprising a single-axis loading head, a clamping plate, a support platform, a full-coverage loading head, and a sensor assembly. The clamping plate has a first mounting hole on one side of its top and a second mounting hole on the other side of its top. The full-coverage loading head also includes a housing, a locking device disposed within the housing cavity, a needle chamber disposed within the housing cavity, a needle body disposed within the needle chamber cavity, a spiral support rod fixedly connected to one end of the needle body, a spring fixedly connected to one end of the spiral support rod, anti-shake column slots formed on the inner walls of both sides of the needle chamber, anti-shake columns disposed within the anti-shake column slot cavities, a needle head fixedly connected to one end of the anti-shake column, and a locking slot formed at the lower part of the housing.

[0008] The invention is further configured such that the other end of the spring is fixedly connected to the bottom of the needle chamber cavity, and the single-axis loading head is disposed in the cavity of the second mounting hole.

[0009] The present invention is further configured such that a first cutting slit is provided on one side of the clamping plate, and a second cutting slit is provided on the other side of the clamping plate.

[0010] The present invention is further configured such that a first fixing hole is provided on one side of the front of the clamping plate, and a second fixing hole is provided on the other side of the front of the clamping plate.

[0011] The present invention is further configured such that one end of the positioning device is provided with a push-pull handle, and the surface of the positioning device is provided with a triangular beam.

[0012] The present invention has the following beneficial effects.

[0013] 1. This invention, by incorporating a locking device and a push-pull handle, utilizes a three-dimensional needle carving structure. During the experiment, the experimenter can push the push-pull handle to allow the locking device to enter the locking device slot within the inner cavity of the outer shell, causing the triangular beam and the spiral support rod to engage stably. This engagement is similar to that of a screw and nut. During the molding stage, the needle body undergoes varying degrees of displacement due to the shape of the single particle surface. In the subsequent loading stage, the locking device is inserted into the locking device slot within the inner cavity of the outer shell, and the engagement of the triangular beam and the spiral support rod fixes the needle body at any position. The fixed needle body cannot be reset, ensuring full coverage of the single particle by the loading needle and enabling it to adapt to single particles of various shapes.

[0014] 2. The present invention simplifies the installation process of the linear displacement sensor group by reserving a cutting slit in the clamp. Only the tightness of the screws needs to be controlled to adjust the disassembly and fixation. This not only prevents damage to the linear displacement sensor group due to excessive clamping, but also avoids experimental errors caused by the vibration of the linear displacement sensor group during the test due to incomplete fixation.

[0015] 3. This invention can perform full-coverage loading on single-particle materials such as natural quartz sand, and can adapt well to single particles of various shapes. It can be used to study the failure behavior and mechanical shape of single particles under full-coverage loading. Moreover, one loading device can realize full-coverage loading at the same time, and is widely applicable to single particles of various shapes.

[0016] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0018] Figure 1 This is a three-dimensional view of a single-particle full-coverage loading device.

[0019] Figure 2 This is a front view of the full-coverage loading head in a single-particle full-coverage loading device.

[0020] Figure 3 This is a top view of the full-coverage loading head in a single-particle full-coverage loading device.

[0021] Figure 4 This is a side view of the full-coverage loading head in a single-particle full-coverage loading device.

[0022] Figure 5 This is a schematic diagram of the interlocking structure of the locking device and the spiral support rod in a single-particle full-coverage loading device.

[0023] Figure 6 This is a front view of the needle body in a single-particle full-coverage loading device.

[0024] Figure 7 This is a top view of the needle in a single-particle full-coverage loading device.

[0025] Figure 8 This is a schematic diagram of a clamping plate in a single-particle full-coverage loading device.

[0026] In the attached diagram: 1. Single-axis loading head; 2. Clamping plate; 3. Full-coverage loading head; 4. Support platform; 5. Sensor group; 6. Housing; 7. Positioner; 8. Needle body; 9. Needle chamber; 10. Anti-shake column slot; 11. Needle head; 12. Anti-shake column; 13. Spiral support rod; 14. Spring; 15. Triangular beam; 16. First mounting hole; 17. Second mounting hole; 18. First cutting slot; 19. Second cutting slot; 20. First fixing hole; 21. Second fixing hole; 22. Push-pull handle. Detailed Implementation

[0027] The technical solutions of the present invention will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments.

[0028] Example 1

[0029] Please see Figures 1-8 This invention is a single-particle full-coverage loading device, comprising a single-axis loading head 1, a clamping plate 2, a support platform 4, a full-coverage loading head 3, and a sensor group 5. The clamping plate 2 has a first mounting hole 16 on one side of its top and a second mounting hole 17 on the other side of its top. The full-coverage loading head 3 also includes a housing 6, a positioning device 7 disposed in the inner cavity of the housing 6, a needle chamber 9 disposed in the inner cavity of the housing 6, a needle body 8 disposed in the inner cavity of the needle chamber 9, a spiral support rod 13 fixedly connected to one end of the needle body 8, a spring 14 fixedly connected to one end of the spiral support rod 13, anti-shake column slots 10 opened on both sides of the inner wall of the needle chamber 9, anti-shake column 12 disposed in the inner cavity of the anti-shake column slot 10, a needle head 11 fixedly connected to one end of the anti-shake column 12, and a positioning slot opened at the lower part of the housing 6.

[0030] Further details: The needle chamber 9 is arranged in a uniform mesh pattern within the inner cavity of the outer shell 6, in a row of 25 rows and 9 columns. The width of the locking slot is greater than the thickness of the corresponding locking device 7. The surface of the locking device 7 is provided with triangular beams 15 arranged in a row of 9 rows and 3 columns. The interlocking relationship between the triangular beams 15 and the spiral support rod 13 allows the needle body 8 to be positioned by inserting into the locking device 7 after being molded by a single particle. At the same time, it can fix the needle body 8 at any height, providing stable load-bearing capacity for the loading stage after the molding stage.

[0031] Example 2

[0032] Please see Figures 1-8 Based on embodiment 1, the other end of the spring 14 is fixedly connected to the bottom of the inner cavity of the needle chamber 9. The single-axis loading head 1 is set in the inner cavity of the second mounting hole 17. A first cutting slit 18 is provided on one side of the clamping plate 2, and a second cutting slit 19 is provided on the other side of the clamping plate 2. The first cutting slit 18 and the second cutting slit 19 extend from one edge of the clamping plate 2 to the second mounting hole 17 and the first mounting hole 16, respectively. A first fixing hole 20 is provided on one side of the front of the clamping plate 2, and a second fixing hole 21 is provided on the other side of the front of the clamping plate 2. The axes of the first fixing hole 20 and the second fixing hole 21 are perpendicular to the second cutting slit 19 and the first cutting slit 18, respectively, and pass through them. A push-pull handle 22 is provided at one end of the locking device 7, and a triangular beam 15 is provided on the surface of the locking device 7.

[0033] Further details: The first mounting hole 16, the second cutting slit 19, and the first fixing hole 20 are used to clamp the sensor assembly 5; the second mounting hole 17, the first cutting slit 18, and the second fixing hole 21 are used to clamp the single-axis loading head 1; the first cutting slit 18 and the second cutting slit 19 extend from one side edge of the clamping plate 2 to the second mounting hole 17 and the first mounting hole 16, respectively; the axes of the first fixing hole 20 and the second fixing hole 21 are perpendicular to the second cutting slit 19 and the first cutting slit 18, respectively, and pass through them.

[0034] The working principle of this invention is as follows: a pre-made single-particle model is placed on the support platform 4, a small amount of epoxy resin is applied to the bottom of the single-particle model to bond the bottom of the single-particle model to the support platform 4, and after the epoxy resin hardens, the single-axis loading head 1 is lowered so that the needle body 8 touches the single-particle model and undergoes different displacements. Then, the push-pull handle 22 is pushed to fix the needle body 8 in place by the locking device 7. Then, the single-axis loading head 1 is raised again while maintaining the displacement of the needle body 8.

[0035] At this time, the needles 8 on the full-coverage loading head 3 have been displaced to varying degrees due to the surface shape of the single particle. The clamping device 7 is used to maintain the current displacement state and lower the single-axis loading head 1 to implement full-coverage loading on the single particle model until the single particle model is destroyed. The loading displacement is calculated by the sensor group 5, the loading force of the single-axis loading head 1 is recorded, the stress-strain curve of the single particle under the full-coverage loading condition is plotted, and the failure mode of the single particle model is observed.

[0036] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A single-particle full-coverage loading device, comprising a single-axis loading head (1), a clamping plate (2), a support platform (4), a full-coverage loading head (3), and a sensor group (5), characterized in that: The clamping plate (2) has a first mounting hole (16) on one side of its top and a second mounting hole (17) on the other side of its top. The full-coverage loading head (3) also includes a housing (6), a locking device (7) disposed in the inner cavity of the housing (6), a needle chamber (9) disposed in the inner cavity of the housing (6), a needle body (8) disposed in the inner cavity of the needle chamber (9), a spiral support rod (13) fixedly connected to one end of the needle body (8), a spring (14) fixedly connected to one end of the spiral support rod (13), anti-shake column slots (10) opened on both sides of the inner wall of the needle chamber (9), an anti-shake column (12) disposed in the inner cavity of the anti-shake column slot (10), a needle tip (11) fixedly connected to one end of the anti-shake column (12), and a locking slot opened at the lower part of the housing (6).

2. The single-particle full-coverage loading device according to claim 1, characterized in that: The other end of the spring (14) is fixedly connected to the bottom of the inner cavity of the needle chamber (9), and the single-axis loading head (1) is set in the inner cavity of the second mounting hole (17).

3. The single-particle full-coverage loading device according to claim 1, characterized in that: The clamping plate (2) has a first cutting slit (18) on one side and a second cutting slit (19) on the other side.

4. The single-particle full-coverage loading device according to claim 1, characterized in that: The clamping plate (2) has a first fixing hole (20) on one side of its front and a second fixing hole (21) on the other side of its front.

5. The single-particle full-coverage loading device according to claim 1, characterized in that: One end of the positioning device (7) is provided with a push-pull handle (22), and a triangular beam (15) is provided on the surface of the positioning device (7).

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