Rock sample axial deformation sensor fastening device
By designing a fastening device for a rock sample axial deformation sensor that includes a nut, a ring, and a self-locking washer, the problems of difficult sensor calibration and loosening were solved, achieving accurate calibration and stable fastening of the sensor and improving data accuracy.
Patent Information
- Application Number
- CN202520298191.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2035-02-24
AI Technical Summary
In rock compression tests, axial deformation sensors are difficult to calibrate and the fastening devices are prone to loosening, resulting in inaccurate data and loss of reference value.
A fastening device for a rock sample axial deformation sensor is designed. The device uses a combination of a first nut, a ring, a double-layered self-locking washer, and a second nut. It achieves accurate calibration of the initial reading of the sensor by using threaded fixing and a locating pin. The self-locking is achieved by the engagement between the double-layered self-locking washer, the ring, and the second nut to prevent loosening.
It achieves precise sensor calibration and stable fastening under vibration conditions, improving data accuracy and stability, and is easy to operate.
Smart Images
Figure CN223637249U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of sensor fixing, in particular to a rock sample axial deformation sensor fastening device, which is mainly applied to the fastening and anti-loosening and anti-vibration of the axial deformation sensor in rock compression test. BACKGROUND
[0002] It is of great significance to study the mechanical properties of rock to obtain the accurate data of axial deformation of rock under the load of the testing machine. Among them, the axial deformation sensor is the main component for obtaining deformation data, and the accuracy of deformation data is not only related to the accuracy of the sensor, but also related to the stability of the test device.
[0003] Before the rock compression test, the initial position of the axial deformation sensor needs to be calibrated. Based on long-term operation experience, the initial value displayed on the test software of the sensor is about-300um, because the range of the sensor is limited, if the initial value is not calibrated, the test value obtained in the test process may exceed the range of the sensor, resulting in missing of part of the data or inaccuracy of the data record. In the calibration process of the sensor, the experimenter needs to slightly loosen the nut and then rotate the screw rod to adjust the initial value to the target value, and then tighten the nut, but the process of tightening the nut will drive the calibrated screw rod, affecting the calibration result.
[0004] At the same time, in the test process, the screw rod with the axial deformation sensor installed moves gradually with the compression of the rock, so that the sensor is displaced and generates a signal to record the displacement data. However, under the influence of the body vibration generated during the pressurization of the testing machine and the vibration generated by the acoustic emission phenomenon during the compression of the rock, the screw fixing the screw rod often loosens, resulting in that the deformation data obtained in the test fluctuates sharply and does not conform to the actual situation, losing the reference value.
[0005] Therefore, it is necessary to design a rock sample axial deformation sensor fastening device to solve the technical problems of calibration difficulty of the sensor and loosening of the fastening device of the sensor in the test. CONTENT OF THE INVENTION
[0006] In view of the technical problems in the background art, the present application provides a rock sample axial deformation sensor fastening device, which sequentially stacks a first nut, a ring, a double-stacked self-locking washer and a second nut on a copper wire rod and preliminarily fixes them by using threads, fastens the first nut and the ring by using a positioning pin, and then realizes accurate calibration of the initial reading of the sensor by rotating the copper wire rod, and then realizes self-locking of the rock sample axial deformation sensor fastening device by the clamping action between the double-stacked self-locking washer and the ring and the second nut after tightening the second nut, thereby solving the technical problems of calibration difficulty of the sensor and loosening of the fastening device of the sensor in the test, and the operation is convenient.
[0007] In a first aspect, the embodiments of the present application provide a rock sample axial deformation sensor fastening device, which comprises a copper wire rod, a positioning pin, a first nut, a circular ring, a double-stacked self-locking washer and a second nut which are sequentially and sleeved on the copper wire rod; the circular ring is provided with a circular groove for clamping the first nut on the annular plane thereof, the bottom center of the circular groove is provided with a hole for passing through the copper wire rod, and the inner wall of the circular groove is provided with a first pin groove; the cylindrical edge of the first nut is provided with a second pin groove.
[0008] Further, the first nut and the second nut are both circular ring cylinders, the circular ring and the double-stacked self-locking washer are both flat circular ring cylinders with a height less than a diameter, and the first nut, the double-stacked self-locking washer and the second nut are sleeved on the copper wire rod through the hole in the center of the cylinder.
[0009] Further, the inner wall of the hole at the bottom of the circular groove is provided with threads, the inner wall of the hole in the center of the cylinder of the first nut and the second nut is provided with threads, and the outer wall of the copper wire rod is provided with threads.
[0010] Further, the depth of the circular groove is less than the height of the cylinder of the circular ring.
[0011] Further, the number of the first pin groove is consistent with that of the second pin groove, the first pin groove and the second pin groove are closely combined to form a groove, and the positioning pin is clamped into the groove formed by the first pin groove and the second pin groove.
[0012] Further, the depth of the groove formed by the combination of the first pin groove and the second pin groove is less than the length of the positioning pin.
[0013] Further, the number of the first pin groove is greater than or equal to 2, and the number of the second pin groove is greater than or equal to 2.
[0014] Further, the double-stacked self-locking washer is composed of two flat circular ring-shaped washer layers which are stacked, the contact surface between the two flat circular ring-shaped washers is a large tooth surface, and the large tooth surface is provided with cam-shaped tooth-shaped protrusions; the contact surface between the flat circular ring-shaped washer and the circular ring and the contact surface between the flat circular ring-shaped washer and the second nut are small tooth surfaces, the small tooth surfaces are provided with tooth-shaped protrusions, and the sawtooth density of the small tooth surface is greater than that of the large tooth surface.
[0015] Further, the outer side wall of the first nut and the outer side wall of the second nut are both provided with anti-slip vertical lines.
[0016] Further, the first nut is made of copper, the positioning pin is made of magnet, and the circular ring is made of steel.
[0017] The beneficial effects of the present application are as follows:
[0018] The present application provides a rock sample axial deformation sensor fastening device, which realizes accurate calibration of the initial reading of the sensor and self-locking of the rock sample axial deformation sensor fastening device through cooperation of the first nut, the ring, the double-stacked self-locking washer, the second nut, the copper wire rod and the positioning pin, solves the technical problems of difficult calibration of the sensor and easy loosening of the fastening device of the sensor in the test, and is convenient to operate.
[0019] In one aspect, the first nut, the ring, the double-stacked self-locking washer and the second nut are sequentially stacked on the copper wire rod and preliminarily fixed by threads, a circular groove for the first nut to be clamped into is arranged on the ring, a first pin groove is arranged on the inner wall of the circular groove, and a second pin groove is arranged on the edge of the column body of the first nut. In actual use, the first nut is clamped into the circular groove and rotated to a position where the second pin groove is aligned with the first pin groove, the positioning pin is clamped in, the fastening between the first nut and the ring is realized, and the fastening between the ring, the double-stacked self-locking washer and the second nut and the copper wire rod has not yet been completely realized. By rotating the copper wire rod, the initial reading of the sensor installed on the copper wire rod can be calibrated in a small range, which is convenient to operate and has high accuracy.
[0020] In another aspect, the double-stacked self-locking washer is arranged between the ring and the second nut, small tooth surfaces are arranged between the double-stacked self-locking washer and the ring and the second nut to make them tightly engage, and cam-shaped large tooth surfaces are arranged between the two identical flat ring-shaped washers that make up the double-stacked self-locking washer, so that the large tooth surfaces are lifted when they move relatively between the washers, realizing self-locking of the rock sample axial deformation sensor fastening device, improving the stability of the device under vibration conditions, and further improving the accuracy of the data.
[0021] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, which can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following will specifically describe the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS
[0022] In order to more clearly illustrate the technical solutions of the present application, the drawings used in the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating any creative labor.
[0023] Figure 1 The figure is a schematic diagram of the overall structure of the rock sample axial deformation sensor fastening device in the embodiments of the present application.
[0024] Figure 2It is a structural schematic view of the axial deformation sensor fastening device for the rock sample in the embodiment of the application;
[0025] Figure 3 It is a partial enlarged view of the axial deformation sensor fastening device for the rock sample in the embodiment of the application.
[0026] Figure 4 It is a structural schematic view of the axial deformation sensor fastening device for the rock sample in the embodiment of the application;
[0027] Figure 5 It is a partial enlarged view of the axial deformation sensor fastening device for the rock sample in the embodiment of the application. DETAILED DESCRIPTION
[0028] The embodiments of the technical scheme of the application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the application, and therefore only serve as examples, and cannot limit the protection scope of the application.
[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "include" and "have" and any variations thereof used in the specification and claims of this application and the above description of the drawings are intended to cover the non-exclusive inclusion.
[0030] In the description of the embodiments of the application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.
[0031] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily mutually exclusive or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0032] In the description of the embodiments of the application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.
[0033] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.
[0034] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0035] It is of great significance to study the mechanical properties of rock to obtain accurate data of axial deformation of rock under the load of a testing machine. Among them, the axial deformation sensor is the main component for obtaining deformation data, and the accuracy of deformation data is not only related to the accuracy of the sensor, but also related to the stability of the testing device. However, in the rock compression test, the existing technology still has the technical problems of difficulty in calibrating the sensor and the fastening device of the sensor is easy to loosen in the test.
[0036] In order to solve the above technical problems, the present application provides a rock sample axial deformation sensor fastening device and a using method thereof, wherein the first nut 2, the ring 3, the double-stacked self-locking washer 4 and the second nut 5 are sequentially stacked and sleeved on the copper wire rod 6 and preliminarily fixed by threads, the first nut 2 and the ring 3 are fastened by the positioning pin 1, and then the initial reading of the sensor is accurately calibrated by rotating the copper wire rod 6, and then the double-stacked self-locking washer 4 is tightened, and the self-locking of the rock sample axial deformation sensor fastening device is realized by the meshing action between the small gear of the double-stacked self-locking washer 4 and the ring 3 and the second nut 5, which solves the technical problems of difficulty in calibrating the sensor and the fastening device of the sensor is easy to loosen in the test, and the operation is convenient.
[0037] Please refer to Figures 1 to 5The structure diagram of the axial deformation sensor fastening device for rock sample provided by the application. The axial deformation sensor fastening device comprises a copper wire rod 6 and a positioning pin 1, and a first nut 2, a circular ring 3, a double-stacked self-locking washer 4 and a second nut 5 are sequentially stacked and sleeved on the copper wire rod 6. That is, the circular ring 3 is located between the first nut 2 and the double-stacked self-locking washer 4, and the double-stacked self-locking washer 4 is located between the circular ring 3 and the second nut 5.
[0038] In the embodiment of the application, the first nut 2 and the second nut 5 are both circular cylindrical bodies, and the circular ring 3 and the double-stacked self-locking washer 4 are both flat circular cylindrical bodies with a height less than a diameter. A circular groove 32 for clamping the first nut 2 is arranged on the annular plane of the circular ring 3, the depth of the circular groove 32 is greater than / equal to / less than the length of the first nut 2 and at the same time less than the height of the cylindrical body of the circular ring 3, and a hole for the copper wire rod 6 to pass through is arranged at the center of the bottom of the circular groove 32. The first nut 2, the double-stacked self-locking washer 4 and the second nut 5 are sleeved on the copper wire rod 6 through the hole at the center of the cylindrical body.
[0039] In the embodiment of the application, the inner wall of the hole at the bottom of the circular groove 32 is provided with threads, the inner wall of the hole at the center of the cylindrical body of the first nut 2 and the second nut 5 is provided with threads, and the outer wall of the copper wire rod 6 is provided with threads.
[0040] In this way, the copper wire rod 6 is connected and fastened with the first nut 2, the circular ring 3, the double-stacked self-locking washer 4 and the second nut 5 through threads. In actual use, the relative position of the copper wire rod 6 and the first nut 2, the circular ring 3 can be adjusted by rotating the copper wire rod 6, so as to adjust the horizontal height of the sensor assembled on the copper wire rod 6 during the test, calibrate the initial reading of the sensor, and then fix the copper wire rod 6 by rotating the second nut 5, so as to realize the fastening of the device.
[0041] In the embodiment of the application, the inner wall of the circular groove 32 of the circular ring 3 is provided with a first pin groove 31, the edge of the cylindrical body of the first nut 2 is provided with a second pin groove 21, the number of the first pin groove 31 is consistent with that of the second pin groove 21, the first pin groove 31 and the second pin groove 21 are tightly combined to form a groove, and the positioning pin 1 is clamped into the groove formed by the combination of the first pin groove 31 and the second pin groove 21. Preferably, the number of the first pin groove 31 is greater than or equal to 2, and the number of the second pin groove 21 is greater than or equal to 2. In actual use, the second pin groove 21 is aligned with the first pin groove 31 one by one by rotating, and after the positioning pin 1 is clamped into the groove formed by the alignment of the first pin groove 31 and the second pin groove 21, the first nut 2 is fixed on the circular ring 3 and cannot be rotated or moved any more, and can only be adjusted by rotating the copper wire rod 6 to adjust the relative position of the copper wire rod 6 and the first nut 2, the circular ring 3, so as to adjust the horizontal height of the sensor and realize calibration.
[0042] Preferably, the positioning pin 1 is cuboid. Preferably, the first pin groove 31 and the second pin groove 21 combined form a groove 32 with a depth less than the length of the positioning pin 1. In this way, the positioning pin 1 still has a part exposed outside the ring 3 after being clamped into the groove, and the positioning pin 1 can be put into or taken out of the groove by hand, improving the convenience of installation and disassembly.
[0043] In the embodiment of the present application, the double-stacked self-locking washer 4 is composed of two identical flat ring-shaped washer layers. The contact surface between the two flat ring-shaped washers is a large tooth surface, and the large tooth surface is provided with cam-shaped tooth-shaped protrusions. The contact surface between the flat ring-shaped washer and the ring and the contact surface between the flat ring-shaped washer and the second nut is a small tooth surface, and the small tooth surface is provided with tooth-shaped protrusions, and the sawtooth density of the small tooth surface is greater than that of the large tooth surface. In this way, the friction between the washer and the washer, the washer and the ring 3, and the washer and the second nut 5 is greatly increased. In actual use, after the device is tightened by rotating the second nut 5, when vibration occurs, due to the large friction between the small tooth surface and the end surface in contact with it, the small tooth surface can tightly engage the ring 3 and the second nut 5 in contact with it, and then the large tooth surfaces of the two washers are lifted and moved, realizing self-locking, avoiding loosening of the tightening device, and improving the accuracy of the measurement data.
[0044] In the embodiment of the present application, the outer side walls of the first nut 2 and the second nut 5 are provided with anti-skid vertical lines. In actual use, the anti-skid vertical lines can increase the friction, which is beneficial to control the rotation of the nut and screw it to the appropriate position.
[0045] In the embodiment of the present application, the first nut 2 is preferably made of copper, the positioning pin 1 is preferably made of magnet, and the ring 3 is preferably made of steel. In this way, the positioning pin 1 can be attracted to the ring 3 by magnetic force and is not easy to fall off.
[0046] The use method of the rock sample axial deformation sensor tightening device provided by the present application is as follows:
[0047] First, the second nut 5 and the double-stacked self-locking washer 4 are sequentially and successively sleeved on the copper wire rod 6, and the copper wire rod 6 is inserted through the ring 3, and the copper wire rod 6 is rotated to be fixed near the standard position, so that the copper wire rod 6 is perpendicular to the annular plane of the ring 3, and the double-stacked self-locking washer 4 is tightly attached to the ring 3.
[0048] Then, the first nut 2 is sleeved on the copper wire rod 6, the first nut 2 is rotated to be clamped into the circular groove 32 on the ring 3, and is screwed to the position where the first pin groove 31 and the second pin groove 21 are aligned, then the positioning pin 1 is inserted into the circular groove 32 formed by the first pin groove 31 and the second pin groove 21, and the copper wire rod 6 is rotated to make the bottom of the first nut 2 tightly attached to the ring 3, thereby obtaining the rock sample axial deformation sensor tightening device provided by the present application.
[0049] Then, the sensor is installed on the copper wire rod 6 near one end of the second nut 5, the sample and the fastening device are assembled as a whole, the assembled whole is placed on the test loading platform, the circuit is connected, the initial reading of the axial sensor is checked by the test machine software, the copper wire rod 6 is rotated to calibrate the initial reading, after calibration, the second nut 5 is tightened to realize self-locking of the fastening device, and the loading test is started.
[0050] After the test is completed, the circuit is removed, the sample and the sensor are removed, the positioning pin 1 is pulled out, the first nut 2 and the copper wire rod 6 are rotated to loosen the fastening device, the double-stacked self-locking washer 4 and the second nut 5 are further loosened, and finally the first nut 2, the ring 3, the double-stacked self-locking washer 4 and the second nut 5 are removed from the copper wire rod 6, that is, the disassembly of the fastening device is completed.
[0051] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and embodiments having the same technical idea and playing the same role and effect within the technical solution range of the present application are all included in the technical solution range of the present application. In addition, within the scope of the main idea of the present application, various modifications of the embodiments that can be thought of by those skilled in the art, and other ways constructed by combining part of the constituent elements in the embodiments are also included in the scope of the present application.
Claims
1. A rock sample axial deformation sensor fastening device, characterized by, The application relates to a copper wire rod and a positioning pin, and a first nut, a circular ring, a double-stacked self-locking washer and a second nut which are sequentially stacked on the copper wire rod; a circular groove for clamping the first nut is arranged on the annular plane of the circular ring, a hole for penetrating the copper wire rod is arranged at the bottom center of the circular groove, a first pin groove is arranged on the inner wall of the circular groove, and a second pin groove is arranged on the column edge of the first nut.
2. The axial deformation sensor fastening device for rock samples according to claim 1, characterized in that, The first nut and the second nut are both circular ring columns, the circular ring and the double-stacked self-locking washer are both flat circular ring columns with a height less than a diameter, and the first nut, the double-stacked self-locking washer and the second nut are sequentially stacked on the copper wire rod through the hole at the center of the column.
3. The axial deformation sensor fastening device for rock samples according to claim 1, characterized in that, The inner wall of the hole at the bottom of the circular groove is provided with threads, the inner wall of the hole at the center of the column of the first nut and the second nut is provided with threads, and the outer wall of the copper wire rod is provided with threads.
4. The axial deformation sensor fastening device for rock samples according to claim 1, characterized in that, The depth of the circular groove is less than the column height of the circular ring.
5. The axial deformation sensor fastening device for rock samples according to claim 1, characterized in that, The number of the first pin groove is consistent with that of the second pin groove, the first pin groove and the second pin groove are close to each other and combined to form a groove, and the positioning pin is clamped into the groove formed by the combination of the first pin groove and the second pin groove.
6. The axial deformation sensor fastening device for rock samples according to claim 5, characterized in that The depth of the groove formed by the combination of the first pin groove and the second pin groove is less than the length of the positioning pin.
7. The axial deformation sensor fastening device for rock samples according to claim 5, characterized in that, The number of the first pin groove is greater than or equal to 2, and the number of the second pin groove is greater than or equal to 2.
8. The axial deformation sensor fastening device for rock samples according to claim 1, characterized in that, The double-stacked self-locking washer is composed of two flat circular ring-shaped washer layers which are stacked together, the contact surface between the two flat circular ring-shaped washers is a large tooth surface, and cam-shaped tooth-shaped protrusions are arranged on the large tooth surface; the contact surface between the flat circular ring-shaped washer and the circular ring and the contact surface between the flat circular ring-shaped washer and the second nut are small tooth surfaces, tooth-shaped protrusions are arranged on the small tooth surfaces, and the sawtooth density of the small tooth surface is greater than that of the large tooth surface.
9. The axial deformation sensor fastening device for rock samples according to claim 1, characterized in that, Anti-skid vertical lines are arranged on the outer walls of the first nut and the second nut.
10. The axial deformation sensor fastening device for rock samples according to claim 1, characterized in that, The first nut is made of copper, the positioning pin is made of magnet, and the circular ring is made of steel.