Clamp device for stretching universal joints at two ends of cylindrical rock sample under confining pressure

Abstract

The utility model discloses a clamp device for stretching universal joints at two ends of a cylindrical rock sample under confining pressure, which comprises a high-pressure-bearing pressure cylinder and a stretching sample, and high-pressure-bearing pressure end covers are arranged at two ends of the high-pressure-bearing pressure cylinder. According to the utility model, the cylindrical rock sample is placed in the high-pressure oil and sample isolating membrane arranged in the high-pressure bearing cylinder to apply confining pressure, and meanwhile, tensile force can be applied to the two ends of the sample to simulate the tensile stress state of the rock under the actual geological condition; a universal joint mechanism composed of a high-pressure-bearing flexible connecting seat, a high-pressure-bearing flexible piece, a bearing and a connecting pin can ensure that tensile force can be uniformly transmitted to the two ends of a sample, and the uniformity of the force can be kept even if the sample is slightly deformed or eccentrically loaded, so that the accuracy and repeatability of an experimental result are ensured, and the test efficiency is improved. Therefore, reliable experimental data is provided for rock mechanics research and engineering application.

Description

Technical Field

[0001] This utility model relates to the technical field of rock mechanics experimental equipment, and in particular to a universal joint tension clamp device for a cylindrical rock sample under confining pressure at both ends. Background Technology

[0002] A cylindrical rock specimen tensile clamp device with universal joints at both ends under confining pressure is a device specifically designed for rock mechanics experiments. It can perform tensile testing on a cylindrical rock specimen while applying confining pressure, through the design of universal joints at both ends, ensuring that the specimen can undergo accurate tensile testing under the action of multi-directional forces.

[0003] In current rock mechanics experiments, existing equipment is complex to operate, and it is difficult to adjust the position of the sample and apply force. It cannot adapt to the small deformations or eccentricities that may occur in the rock sample during loading, thus affecting the accuracy of the experimental results. Utility Model Content

[0004] One objective of this invention is to provide a universal joint tension clamp device for a cylindrical rock sample under confining pressure. This invention addresses the problem mentioned in the background that existing devices in current rock mechanics experiments are complex to operate, difficult to adjust the sample position and apply force, and cannot adapt to the slight deformation or eccentricity that may occur in the rock sample during loading, thus affecting the accuracy of the experimental results.

[0005] A cylindrical rock sample tensile clamping device with universal joints at both ends under confining pressure according to an embodiment of the present invention includes a high-pressure bearing cylinder and a tensile sample. Both ends of the high-pressure bearing cylinder are provided with high-pressure bearing end caps. A support mechanism is provided inside the high-pressure bearing cylinder. A high-pressure oil and sample isolation membrane are provided inside the high-pressure bearing cylinder. A high-pressure bearing flexible connecting seat is symmetrically arranged at one end of the high-pressure bearing cylinder. A first connecting column is fixedly connected to one end of the high-pressure bearing flexible connecting seat. A high-pressure bearing force transmission rod is threadedly connected to the top of the upper end of the first connecting column. A high-pressure bearing flexible component is provided inside the high-pressure bearing flexible component. A bearing is rotatably connected inside the high-pressure bearing flexible connecting seat. A second connecting column is fixedly connected to the side of the high-pressure bearing flexible connecting seat near the high-pressure oil and sample isolation membrane. A high-pressure tensile sample connecting seat is threadedly connected to one end of the second connecting column.

[0006] Preferably, the high-pressure end cap is fixedly connected to the high-pressure cylinder by bolts.

[0007] Preferably, the support mechanism includes a support ring, a positioning frame is fixedly connected inside the support ring, a spring is fixedly connected inside each positioning frame, and a pressing member is fixedly connected to one end of each spring.

[0008] Preferably, the positioning frame, spring, and extrusion member are arranged in a circular and uniform manner, comprising a plurality of such components.

[0009] Preferably, a buffer pad is fixedly connected to the inner side of the extrusion member, and the extrusion member and the positioning frame are adapted to each other and are slidably connected.

[0010] Preferably, the high-pressure bearing flexible component and the bearing are rotatably connected to the high-pressure bearing flexible connecting seat via a connecting pin.

[0011] Preferably, the high-pressure tensile specimen connector is adapted to the tensile specimen and is a sliding connection.

[0012] Preferably, the high-pressure bearing cylinder and the tensile specimen are both made of glass fiber reinforced plastic, and the high-pressure bearing flexible connector, the first connecting column, the high-pressure bearing flexible component, the bearing, the connecting pin, the second connecting column, and the high-pressure tensile specimen connector are all made of tool steel.

[0013] The beneficial effects of this utility model are:

[0014] This invention, through a universal joint tension clamp device for confining a cylindrical rock sample at both ends, effectively avoids the difficulties in adjusting the sample position and applying force, and the inability to adapt to minor deformations or eccentricities that may occur during loading, thus affecting the accuracy of experimental results. In use, the cylindrical rock sample is placed in a high-pressure oil-isolation membrane inside a high-pressure cylinder to apply confining pressure, while simultaneously applying tensile force to both ends of the sample, simulating the tensile stress state of rock under actual geological conditions. The universal joint mechanism, consisting of a high-pressure flexible connecting seat, a high-pressure flexible component, bearings, and connecting pins, ensures that the tensile force is uniformly transmitted to both ends of the sample, maintaining force uniformity even when the sample undergoes minor deformation or eccentric loading. This ensures the accuracy and repeatability of experimental results, providing reliable experimental data for rock mechanics research and engineering applications.

[0015] This invention features a support mechanism located on the inner wall of the high-pressure cylinder. When the high-pressure oil, the sample isolation membrane, and the tensile sample are inside the high-pressure cylinder, the provided extrusion member and buffer pad will support them under the push of the spring, thus achieving the effect of support and positioning. The provided spring and extrusion member also have an adjustment function, which can be adapted to high-pressure oil and sample isolation membranes and tensile samples of different sizes, thereby improving the application range and stability of the device during use. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the axial side structure of one side of the universal joint tension clamp device at both ends of a cylindrical rock sample under confining pressure proposed in this utility model.

[0018] Figure 2 This is a schematic diagram of the internal structure of a cylindrical rock sample tensile clamp device with universal joints at both ends under confining pressure, as proposed in this utility model.

[0019] Figure 3 This is a schematic diagram of the extrusion component structure of a cylindrical rock sample under confining pressure and tensile clamping device with universal joints at both ends, as proposed in this utility model.

[0020] Figure 4 This is an exploded structural diagram of a universal joint tension clamp device at both ends of a cylindrical rock sample under confining pressure, as proposed in this utility model.

[0021] In the figure: 1. High-pressure bearing cylinder; 2. High-pressure bearing end cap; 3. Support ring; 4. Positioning frame; 5. Spring; 6. Extrusion piece; 7. Buffer pad; 8. High-pressure oil and sample separation membrane; 9. Tensile sample; 10. High-pressure bearing flexible connecting seat; 11. First connecting column; 12. High-pressure bearing flexible component; 13. Bearing; 14. Connecting pin; 15. Second connecting column; 16. High-pressure tensile sample connecting seat; 17. High-pressure bearing force transmission rod. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0023] refer to Figure 1-4A cylindrical rock sample tensile clamping device with universal joints at both ends under confining pressure includes a high-pressure bearing cylinder 1 and a tensile sample 9. Both ends of the high-pressure bearing cylinder 1 are provided with high-pressure bearing end caps 2. A support mechanism is provided inside the high-pressure bearing cylinder 1. A high-pressure oil separator 8 is provided inside the high-pressure bearing cylinder 1. High-pressure bearing flexible connecting seats 10 are symmetrically arranged at one end of the high-pressure bearing cylinder 1. A first connecting column 11 is fixedly connected to one end of the high-pressure bearing flexible connecting seat 10. A high-pressure bearing force transmission rod 17 is threadedly connected to the top of the upper end of the first connecting column 11. A high-pressure bearing flexible component 12 is provided inside the high-pressure bearing flexible component 12. A bearing 13 is rotatably connected inside the high-pressure bearing flexible connecting seat 10 near the high-pressure oil separator 8. A second connecting column 15 is fixedly connected to one side of the 8. One end of the second connecting column 15 is threadedly connected to a high-pressure tensile specimen connecting seat 16. The cylindrical rock specimen is placed in the high-pressure oil and specimen isolation membrane 8 inside the high-pressure cylinder 1 to apply confining pressure, i.e., pressure perpendicular to the specimen axis. At the same time, tensile force can be applied to both ends of the specimen to simulate the tensile stress state of rock under actual geological conditions. The universal joint mechanism composed of the high-pressure flexible connecting seat 10, the high-pressure flexible component 12, the bearing 13, and the connecting pin 14 can ensure that the tensile force can be uniformly transmitted to both ends of the specimen. Even when the specimen undergoes small deformation or eccentric loading, the uniformity of force can be maintained, thereby ensuring the accuracy and repeatability of the experimental results, and thus providing reliable experimental data for rock mechanics research and engineering applications.

[0024] Example 1: The high-pressure end cap 2 is fixedly connected to the high-pressure cylinder 1 by bolts. The support mechanism includes a support ring 3, a positioning frame 4 is fixedly connected inside the support ring 3, and a spring 5 is fixedly connected inside each positioning frame 4. One end of the spring 5 is fixedly connected to an extrusion member 6. The positioning frame 4, spring 5 and extrusion member 6 are arranged in a circular and uniform manner. A buffer pad 7 is fixedly connected to the inner side of the extrusion member 6. The extrusion member 6 and the positioning frame 4 are compatible and are slidably connected. When the high-pressure oil, the sample isolation membrane 8 and the tensile sample 9 are located inside the high-pressure cylinder 1, the extrusion member 6 and the buffer pad 7 will support them under the push of the spring 5 to achieve the effect of support and positioning. The spring 5 and the extrusion member 6 also have an adjustment function, which can be used for high-pressure oil, sample isolation membrane 8 and tensile sample 9 of different sizes, thereby improving the application range and stability of the device during use.

[0025] Example 2: The high-pressure flexible component 12 and the bearing 13 are rotatably connected to the high-pressure flexible connecting seat 10 via the connecting pin 14. The high-pressure tensile specimen connecting seat 16 and the tensile specimen 9 are adapted to each other and are slidably connected. The high-pressure cylinder 1 and the tensile specimen 9 are both made of glass fiber reinforced plastic. The high-pressure flexible connecting seat 10, the first connecting column 11, the high-pressure flexible component 12, the bearing 13, the connecting pin 14, the second connecting column 15, and the high-pressure tensile specimen connecting seat 16 are all made of tool steel, which is a high-hardness and wear-resistant steel suitable for manufacturing components that withstand high pressure.

[0026] Working Principle: The device forms a closed force system through the high-pressure cylinder 1 and the high-pressure end caps 2 at both ends. Inside the high-pressure cylinder 1, the support mechanism includes a support ring 3, a positioning frame 4, a spring 5, and an extrusion component 6. These components work together, with the spring 5 pushing the extrusion component 6 and the buffer pad 7 to support and position the sample, ensuring the sample's stability inside the high-pressure cylinder 1. This design also allows for adjustment of spring 5 and the extrusion component 6 to accommodate samples of different sizes, improving the device's applicability. When confining pressure is applied, the high-pressure oil and the sample isolation membrane 8 evenly transmit pressure to the tensile sample 9. During the tensile process, the high-pressure flexible connecting seat 10 and the bearing... The universal joint mechanism, consisting of the high-pressure flexible component 12, bearing 13, and connecting pin 14, ensures that the tensile force can be uniformly transmitted to both ends of the specimen, maintaining force uniformity even when the specimen undergoes minor deformation or eccentric loading. The high-pressure bearing cylinder 1 and the specimen 9 are made of glass fiber reinforced plastic, which has high strength and lightweight characteristics. The universal joint mechanism and other connecting components, including the first connecting column 11, the high-pressure bearing force transmission rod 17, the second connecting column 15, and the high-pressure tensile specimen connecting seat 16, are made of tool steel, ensuring high hardness and wear resistance. This combination of materials enables the device to withstand high pressure while maintaining operational stability and the accuracy of experimental results.

[0027] In summary, through precise design and material selection, this device achieves the function of applying uniform tensile force to both ends of a rock sample under confining pressure, providing reliable experimental data and equipment for rock mechanics research and engineering applications.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A tension clamping device for universal joints at both ends of a cylindrical rock sample under confining pressure, characterized in that, The device includes a high-pressure bearing cylinder (1) and a tensile specimen (9). Both ends of the high-pressure bearing cylinder (1) are provided with high-pressure bearing end caps (2). The high-pressure bearing cylinder (1) is provided with a support mechanism inside. The high-pressure bearing cylinder (1) is provided with a high-pressure oil and specimen isolation membrane (8) inside. One end of the high-pressure bearing cylinder (1) is symmetrically provided with a high-pressure bearing flexible connecting seat (10). One end of the high-pressure bearing flexible connecting seat (10) is fixedly connected with a first connecting column (11). The top of the first connecting column (11) is threadedly connected with a high-pressure bearing force transmission rod (17). The high-pressure bearing flexible connecting seat (10) is provided with a high-pressure bearing flexible component (12). The high-pressure bearing flexible component (12) is rotatably connected with a bearing (13). The side of the high-pressure bearing flexible connecting seat (10) near the high-pressure oil and specimen isolation membrane (8) is fixedly connected with a second connecting column (15). One end of the second connecting column (15) is threadedly connected with a high-pressure tensile specimen connecting seat (16).

2. The cylindrical rock sample tensile clamping device with universal joints at both ends under confining pressure according to claim 1, characterized in that, The high-pressure end cap (2) is fixedly connected to the high-pressure cylinder (1) by bolts.

3. The cylindrical rock sample tensile clamping device with universal joints at both ends under confining pressure according to claim 1, characterized in that, The support mechanism includes a support ring (3), a positioning frame (4) is fixedly connected inside the support ring (3), and a spring (5) is fixedly connected inside each positioning frame (4), and an extrusion member (6) is fixedly connected to one end of each spring (5).

4. The cylindrical rock sample tensile clamping device with universal joints at both ends under confining pressure according to claim 3, characterized in that, The positioning frame (4), spring (5) and extrusion piece (6) are arranged in a circular and uniform manner, and there are several of them.

5. The cylindrical rock sample tensile clamping device with universal joints at both ends under confining pressure according to claim 3, characterized in that, The inner side of the extrusion member (6) is fixedly connected to a buffer pad (7). The extrusion member (6) and the positioning frame (4) are adapted to each other and are slidably connected.

6. The cylindrical rock sample tensile clamping device with universal joints at both ends under confining pressure according to claim 1, characterized in that, The high-pressure flexible component (12) and bearing (13) are rotatably connected to the high-pressure flexible connecting seat (10) via a connecting pin (14).

7. The cylindrical rock sample tensile clamping device with universal joints at both ends under confining pressure according to claim 1, characterized in that, The high-pressure tensile specimen connector (16) is adapted to the tensile specimen (9) and is a sliding connection.

8. The cylindrical rock sample tensile clamping device with universal joints at both ends under confining pressure according to claim 1, characterized in that, The high-pressure bearing cylinder (1) and the tensile specimen (9) are both made of glass fiber reinforced plastic. The high-pressure bearing flexible connector (10), the first connecting column (11), the high-pressure bearing flexible component (12), the bearing (13), the connecting pin (14), the second connecting column (15), and the high-pressure tensile specimen connector (16) are all made of tool steel.

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