Single-particle full-coverage loading device

Abstract

The invention discloses a single-particle full-coverage loading device, and relates to the technical field of geotechnical engineering experimental equipment. The device comprises a uniaxial loading head, a clamping plate, a bearing platform, a full-coverage loading head and a sensor group, a first mounting hole is formed in one side of the top of the clamping plate, and a second mounting hole is formed in the other side of the top of the clamping plate. According to the single-particle full-coverage loading device, the mechanical characteristics of a single-particle model in a full-coverage complex stress state are measured by loading different loads, the single-particle full-coverage loading device is based on a three-dimensional needle carving structure, and the loading mode of a single particle is expanded; different loading modes such as point loading and plane loading are adopted for a single particle, so that the single particle shows different mechanical behaviors, and the device can realize multi-point full-coverage loading on the single particle through the single particle full-coverage loading head, so that the mechanical behaviors of the single particle can be observed; the analysis and research on the mechanical behavior of the single particle are greatly expanded.

Description

Technical Field

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

[0002] Natural cemented sand, as a typical structured soil material, is widely used in practical engineering. At present, most of the research on the mechanical behavior of cemented sand stays at the macroscopic level, lacking an understanding of the internal particle interaction mechanism, and the relationship between the crushing behavior of cemented sand at the particle scale and the macroscopic mechanical response is not clear. This essentially limits the comprehensive understanding of structured soils such as cemented sand. Only by understanding the internal structure evolution law and damage mechanism of cemented sand from phenomenon to essence, from macroscopic to microscopic, can we propose preventive measures to deal with relevant disasters in practical engineering fundamentally. Therefore, studying the crushing mode and microscopic damage mechanism of cemented sand particles and mastering the true mechanical properties of microscopic cemented sand particles have important theoretical value and practical significance for further improving the multi-scale mechanical mechanism research of structured soil and even geotechnical engineering construction.

[0003] The experimental results obtained by different loading methods for a single particle are quite different. For example, different loading methods for a single particle, such as a single point load or a plane load, will cause the single particle to exhibit different mechanical behaviors. The research on full-coverage loading of a single particle is of great significance. However, the existing single-particle loading devices cannot be applied to various types of particles and have a single loading method, resulting in a reduced overall practicality of the device.

[0004] Therefore, we provide a single-particle full-coverage loading device to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a single-particle full-coverage loading device, which solves the problems that the existing single-particle loading device cannot be applied to various types of particles and has a single single-particle loading method through the cooperation of a uniaxial loading head and a full-coverage loading head.

[0006] To solve the above technical problems, the present invention is realized through the following technical solutions.

[0007] The present invention relates to a single-particle full-coverage loading device, which includes a uniaxial loading head, a clamping plate, a bearing platform, a full-coverage loading head, and a sensor group. One side of the top of the clamping plate is provided with a first mounting hole, and the other side of the top of the clamping plate is provided with a second mounting hole; the full-coverage loading head further includes a housing, a positioning device arranged in the inner cavity of the housing, a needle chamber arranged in the inner cavity of the housing, a needle body arranged in the inner cavity of the needle chamber, 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-vibration column slots opened on both inner walls of the needle chamber, anti-vibration columns arranged in the anti-vibration column slots, a needle head fixedly connected to one end of the anti-vibration column, and a positioning slot opened at the lower part of the housing.

[0008] The present invention is further configured such that the other end of the spring is fixedly connected to the bottom of the inner cavity of the needle chamber, and the uniaxial loading head is arranged in the inner cavity of the second mounting hole.

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

[0010] The present invention is further configured such that a first fixing hole is opened on one side of the front surface of the clamping plate, and a second fixing hole is opened on the other side of the front surface 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 a triangular beam is arranged on the surface of the positioning device.

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

[0013] 1. By providing a positioning device and a push-pull handle, based on a three-dimensional needle carving structure, during the experiment, the experimenter can push the push-pull handle to make the positioning device enter the positioning slot in the inner cavity of the housing, so that the triangular beam and the spiral support rod have a stable engagement. This engagement relationship is similar to the engagement of a screw and a nut. During the shaping stage, the needle body undergoes different degrees of displacement due to the shape of the single-particle surface. In the subsequent loading stage, the positioning device is inserted into the positioning slot in the inner cavity of the housing and the needle body is fixed at any position through the engagement relationship between the triangular beam and the spiral support rod. The fixed needle body cannot be reset, ensuring full coverage of the single-particle by the loading needle head and being able to adapt to various single-particles with different shapes.

[0014] 2. Through the design of reserving cutting slots in the clamping plate, the installation process of the linear displacement sensor group is simplified. Only by controlling the tightness of the screws can the disassembly and fixing be adjusted, which not only prevents damage to the linear displacement sensor group caused by being too tight, but also avoids experimental errors caused by the jitter of the linear displacement sensor group during the experiment due to the incomplete fixation of the linear displacement sensor group.

[0015] 3. The present invention can carry out full coverage loading of single particle materials such as natural quartz sand, and can adapt well to single particles of various shapes. The single particle destructive behavior and mechanical shape under full coverage loading are studied. Moreover, a set of loading devices can simultaneously realize full coverage loading mode, which 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for describing the embodiment are briefly introduced below.

[0018] Figure 1 A three-dimensional diagram of a single-particle full-coverage loading device.

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

[0020] Figure 3 A top view of a full coverage loading head in a single particle full coverage loading device.

[0021] Figure 4 A side view of a full coverage loading head in a single particle full coverage loading device.

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

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

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

[0025] Figure 8 Schematic diagram of a splint in a single-particle full-coverage loading device.

[0026] In the attached drawings: 1. Single-axis loading head; 2. Clamp; 3. Full-coverage loading head; 4. Base; 5. Sensor group; 6. Housing; 7. Positioner; 8. Needle body; 9. Needle cabin; 10. Anti-shake column seam; 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 seam; 19. Second cutting seam; 20. First fixing hole; 21. Second fixing hole; 22. Push-pull handle. DETAILED DESCRIPTION

[0027] Next, the technical solutions in the embodiments of the present invention will be described in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0028] Embodiment 1

[0029] Please refer to Figures 1 - 8 , the present invention is a single-particle full-coverage loading device, including a uniaxial loading head 1, a splint 2, a bearing platform 4, a full-coverage loading head 3 and a sensor group 5. A first mounting hole 16 is provided on one side of the top of the splint 2, and a second mounting hole 17 is provided on the other side of the top of the splint 2; the full-coverage loading head 3 further includes a housing 6, a card holder 7 provided in the inner cavity of the housing 6, a needle cabin 9 provided in the inner cavity of the housing 6, a needle body 8 provided in the inner cavity of the needle cabin 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-vibration column slots 10 provided on both inner walls of the needle cabin 9, anti-vibration columns 12 provided in the anti-vibration column slots 10, a needle tip 11 fixedly connected to one end of the anti-vibration column 12, and a card slot provided at the lower part of the housing 6.

[0030] Further supplement: The needle cabins 9 are arranged in a uniform mesh in the inner cavity of the housing 6, and are arranged in 25 rows and 9 columns. The width of the card slot is greater than the thickness of the card holder 7 that can be correspondingly inserted. The triangular beams 15 are arranged in a uniform manner of 9 rows and 3 columns on the surface of the card holder 7. The engagement relationship between the triangular beams 15 and the spiral support rod 13 enables the needle body 8 to be positioned by inserting into the card holder 7 after being shaped by a single particle, and at the same time, the needle body 8 can be fixed at any height, providing a stable bearing capacity for the loading stage after the shaping stage.

[0031] Embodiment 2

[0032] Please refer to Figures 1 - 8 , on the basis of Embodiment 1, the other end of the spring 14 is fixedly connected to the bottom of the inner cavity of the needle cabin 9. The uniaxial loading head 1 is arranged in the inner cavity of the second mounting hole 17. A first cutting slot 18 is provided on one side of the splint 2, and a second cutting slot 19 is provided on the other side of the splint 2. The first cutting slot 18 and the second cutting slot 19 respectively extend from one side edge of the splint 2 to the first mounting hole 16 and the second mounting hole 17. A first fixing hole 20 is provided on one side of the front surface of the splint 2, and a second fixing hole 21 is provided on the other side of the front surface of the splint 2. The axes of the first fixing hole 20 and the second fixing hole 21 are respectively perpendicular to the first cutting slot 18 and the second cutting slot 19 and penetrate them. One end of the card holder 7 is provided with a push-pull handle 22, and the surface of the card holder 7 is provided with triangular beams 15.

[0033] Further supplement: The first mounting hole 16, the first cutting slot 18, and the first fixing hole 20 are used to clamp the sensor group 5, and the second mounting hole 17, the second cutting slot 19, and the second fixing hole 21 are used to clamp the uniaxial loading head 1. The first cutting slot 18 and the second cutting slot 19 extend from one side edge of the splint 2 to the first mounting hole 16 and the second mounting hole 17 respectively. The axes of the first fixing hole 20 and the second fixing hole 21 are perpendicular to and penetrate the first cutting slot 18 and the second cutting slot 19 respectively.

[0034] The working principle of the present invention is as follows: Place the prefabricated single-particle model on the bearing platform 4, apply a small amount of epoxy resin to the bottom of the single-particle model to bond the bottom of the single-particle model to the bearing platform 4. After the epoxy resin hardens, lower the uniaxial loading head 1 so that the needle body 8 touches the single-particle model and undergoes displacements of different magnitudes. Subsequently, push the push-pull handle 22 to fix the needle body 8 with the positioner 7. Then, raise the uniaxial loading head 1 again while maintaining the displacement of the needle body 8.

[0035] At this time, the needle bodies 8 on the full-coverage loading head 3 undergo displacements of different degrees due to the surface shape of the single particle. Use the positioner 7 to maintain the current displacement state and lower the uniaxial loading head 1 to perform full-coverage loading on the single-particle model until the single-particle model is damaged. Calculate the loading displacement through the sensor group 5, record the magnitude of the loading force of the uniaxial loading head 1, draw the stress-strain curve of the single particle under the full-coverage loading condition, and observe the failure mode of the single-particle model.

[0036] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above 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 uniaxial loading head (1), a clamping plate (2), a bearing platform (4), a full-coverage loading head (3) and a sensor group (5), characterized in that: One side of the top of the clamping plate (2) is provided with a first mounting hole (16), and the other side of the top of the clamping plate (2) is provided with a second mounting hole (17). The full-coverage loading head (3) further includes a housing (6), a positioner (7) arranged in the inner cavity of the housing (6), a needle chamber (9) arranged in the inner cavity of the housing (6), a needle body (8) arranged 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-vibration column slots (10) opened on both inner walls of the needle chamber (9), anti-vibration columns (12) arranged in the anti-vibration column slots (10), a needle tip (11) fixedly connected to one end of the anti-vibration column (12), and a positioner slot opened at the lower part of the housing (6).

2. The single-particle full-coverage loading device according to claim 1, wherein: The other end of the spring (14) is fixedly connected to the bottom of the inner cavity of the needle chamber (9), and the uniaxial loading head (1) is arranged 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: One side of the clamping plate (2) is provided with a first cutting slot (18), and the other side of the clamping plate (2) is provided with a second cutting slot (19).

4. The single-particle full-coverage loading device according to claim 1, wherein: One side of the front surface of the clamping plate (2) is provided with a first fixing hole (20), and the other side of the front surface of the clamping plate (2) is provided with a second fixing hole (21).

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

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