Modular three-component body strain gauge

Abstract

This invention discloses a modular three-component strain gauge, including an underground probe. The underground probe includes a top cap (11) coaxially assembled from top to bottom, three identical detection module columns (12), and a base (13). A sealed cavity (14) is provided on one radial side inside each detection module column (12). The sealed cavities (14) are evenly distributed circumferentially in the axial projection direction. A control cavity (16) is also provided inside the detection module column (12). A sensor (161) and an oil circuit control valve (162) are installed inside the control cavity (16). The outlet of the oil circuit control valve (162) is connected to the sealed cavity (14) and fills the sealed cavity (14) with silicone oil. After the silicone oil is filled, the oil circuit control valve (162) is closed to seal the sealed cavity (14). The sensor (161) detects the pressure change of the silicone oil inside the sealed cavity (14). The underground probe is designed in a modular fashion. The independent modules are easy to manufacture, have a low scrap rate, and are simple to assemble.

Description

Technical Field

[0001] This invention belongs to the field of electromechanical technology, and in particular relates to a modular three-component strain gauge. Background Technology

[0002] Volumetric strain gauges are the primary instruments for observing earthquake precursors and are widely installed and used in seismic observation stations. Currently, the most commonly used component-type volumetric strain gauge is the Sakata three-component volumetric strain gauge, a high-precision downhole strain measurement instrument mainly used for crustal deformation, earthquake monitoring, and geophysical research. Figure 1 As shown in the diagram, the underground probe of the Sakata three-component micro-strain gauge includes a coaxial outer sleeve 1 and inner core column 3. An annular cavity exists between the outer sleeve 1 and the inner core column 3. This annular cavity is divided into three chambers 2 at 120-degree angles to each other by three circumferentially distributed rigid partitions 4. Each of the three independent chambers 2 is filled with silicone oil. The pressure changes in each chamber 2 are directly measured by pressure sensors. By theoretically calculating these three independent volume changes, the magnitude and orientation of the two principal strains can be obtained. The Sakata three-component micro-strain gauge achieves simultaneous measurement of the strain of three horizontal components and can calculate the magnitude and orientation of the two principal strains. However, because the chambers are divided into three parts by rigid partitions, each chamber requires separate vacuuming and silicone oil injection, which increases the difficulty of manufacturing. If any chamber experiences vacuum leakage or insufficient silicone oil vacuum, the entire probe will be rendered unusable. Summary of the Invention

[0003] The purpose of this invention is to provide a modular three-component strain gauge. The underground probe is modularly designed, the independent modules are easy to manufacture, have a low scrap rate, and are simple to assemble.

[0004] The technical solution provided by this invention is as follows:

[0005] A modular three-component strain gauge includes an underground probe; the underground probe includes a top cap 11, three identical detection module columns 12 and a base 13 assembled coaxially from top to bottom;

[0006] The detection module column 12 has a sealed cavity 14 on one radial side inside; the three sealed cavities 14 of the detection module column 12 are evenly distributed circumferentially in the axial projection direction.

[0007] The detection module column 12 is also provided with a control cavity 16. The control cavity 16 is equipped with a sensor 161 and an oil circuit control valve 162. The outlet of the oil circuit control valve 162 is connected to the sealed cavity 14 and fills the sealed cavity 14 with silicone oil. After the silicone oil is filled, the oil circuit control valve 162 is closed to seal the sealed cavity 14. The sensor 161 detects the pressure change of the silicone oil in the sealed cavity 14.

[0008] Preferably, the sealed cavity 14 is located within a circumferential 120-degree sector area.

[0009] Preferably, the cross-sectional shape of the sealed cavity 14 is arc-shaped, crescent-shaped, or fan-shaped.

[0010] Preferably, a lifting beam 15 is installed on the top cap 11.

[0011] Preferably, the main body of the detection module column 12 is machined into a cylinder:

[0012] Step 1: Remove material from a 120-degree sector area on one side of the cylinder to form an axial through groove, forming a slotted cylinder 121; and remove material from one end of the axial through groove to create a large notch;

[0013] Step 2: Weld plate 122 to slotted cylinder 121 at the axial through groove to form a sealed cavity 14;

[0014] Step 3: Install sensor 161 and oil circuit control valve 162 inside the large gap. The outlet of oil circuit control valve 162 is connected to the sealed cavity 14.

[0015] Step 4: Drill a cable hole 123 in the center of the cylinder. The cable of sensor 161 and the cable and oil pipe of oil circuit control valve 162 are led out through the cable hole 123.

[0016] Step 5: Fill the sealed cavity 14 with silicone oil through the oil circuit control valve 162 and then close the oil circuit control valve 162; thus forming the detection module column 12.

[0017] Preferably, the modular three-component micro-strain gauge further includes:

[0018] Step 6: Use plate 122 to weld the slotted cylinder 121 at the large gap to form a control cavity 16; after welding, a detection module cylinder 12 shell with a cylindrical shape is formed.

[0019] Preferably, the cross-sectional shape of the notch is arc-shaped, crescent-shaped, or fan-shaped.

[0020] Preferably, the detection module column 12 is made of stainless steel.

[0021] As can be seen from the technical solution provided by the present invention above, the modular three-component strain gauge provided by the embodiments of the present invention has a modular design for the underground probe. The independent modules are easy to manufacture, have a low scrap rate, and are simple to assemble. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the cross-sectional structure of an underground probe for a three-component volumetric strain gauge in the prior art;

[0024] Figure 2 A schematic diagram of the underground probe structure of the modular three-component strain gauge provided in an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the cylindrical structure of the detection module of the modular three-component micro-strain gauge provided in an embodiment of the present invention;

[0026] Figure 4 for Figure 3 AA section view;

[0027] Figure 5 This is a schematic diagram of the cross-sectional structure of the modular three-component strain gauge detection module column provided in an embodiment of the present invention, from top to bottom. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0029] First, the following explanations are provided for the terms that may be used in this article:

[0030] The term "and / or" means that either or both can be achieved simultaneously. For example, X and / or Y means that it includes both "X" or "Y" as well as the three cases of "X and Y".

[0031] The terms "comprising," "including," "containing," "having," or other similar semantic descriptions should be interpreted as non-exclusive inclusion. For example, including a technical feature element (such as raw material, component, ingredient, carrier, dosage form, material, size, part, component, mechanism, device, step, process, method, reaction conditions, processing conditions, parameter, algorithm, signal, data, product or article of manufacture, etc.) should be interpreted as including not only the expressly listed technical feature element, but also other technical feature elements that are not expressly listed and are well-known in the art.

[0032] The term "composed of" excludes any technical features not expressly listed. When used in a claim, it closes the claim to exclude all technical features other than those expressly listed, except for associated conventional impurities. If the term appears only in a clause of a claim, it limits the claim to the elements expressly listed in that clause; elements recited in other clauses are not excluded from the overall claim.

[0033] The term "parts by mass" indicates the mass ratio between multiple components. For example, if component X is described as x parts by mass and component Y as y parts by mass, then the mass ratio of component X to component Y is x:y. One part by mass can represent any mass; for example, one part by mass can be expressed as 1 kg or 3.1415926 kg, etc. The sum of the parts by mass of all components is not necessarily 100 parts; it can be greater than 100 parts, less than 100 parts, or equal to 100 parts. Unless otherwise stated, parts, proportions, and percentages mentioned herein are all measured by mass.

[0034] Unless otherwise explicitly specified or limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this document according to the specific circumstances.

[0035] When concentration, temperature, pressure, size, or other parameters are expressed as numerical ranges, such ranges should be understood to specifically disclose all ranges formed by any pairing of upper limits, lower limits, or preferred values ​​within that range, regardless of whether the range is explicitly stated; for example, if the numerical range "2 to 8" is stated, then that range should be interpreted to include ranges such as "2 to 7", "2 to 6", "5 to 7", "3 to 4 and 6 to 7", "3 to 5 and 7", "2 and 5 to 7", etc. Unless otherwise stated, the numerical ranges described herein include both their endpoints and all integers and fractions within that range.

[0036] The terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” and “counterclockwise” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience and simplification of description and do not imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this document.

[0037] The embodiments of the present invention will now be described in further detail with reference to the accompanying drawings.

[0038] Example

[0039] like Figure 2 and 3 As shown, a modular three-component volumetric strain gauge, including an underground probe and a surface-mounted main unit, is a known technology. This example... Figure 2 The text only describes an underground probe, which includes a top cap 11, three identical detection module columns 12, and a base 13 assembled coaxially from top to bottom. The assembly method can be a bolt connection, which is a well-known technology and will not be described in detail here.

[0040] The detection module column 12 has a sealed cavity 14 on one radial side inside; the sealed cavity 14 is filled with silicone oil; the sealed cavities 14 of the three detection module columns 12 are evenly distributed circumferentially in the axial projection direction, and the even distribution means that the adjacent sealed cavities 14 are at a 120-degree angle to each other in the axial projection direction.

[0041] The detection module column 12 is also provided with a control cavity 16. The control cavity 16 is equipped with a sensor 161 and an oil circuit control valve 162. The outlet of the oil circuit control valve 162 is connected to the sealed cavity 14 and fills the sealed cavity 14 with silicone oil. After the silicone oil is filled, the oil circuit control valve 162 is closed to seal the sealed cavity 14. The sensor 161 detects the pressure change of the silicone oil in the sealed cavity 14.

[0042] In this example, the sealed cavity 14 is located within a circumferential 120-degree sector area. There is no interference between them.

[0043] like Figure 4 As shown, the cross-sectional shape of the sealed cavity 14 is an arc shape, but it can also be a crescent shape or a fan shape.

[0044] In this example, as Figure 3 and 4 As shown, in a preferred technical solution, the main body of the detection module column 12 is machined into a cylinder:

[0045] Step 1: Remove material from a 120-degree sector area on one side of the cylinder to form an axial through groove, forming a slotted cylinder 121; Here, a slotted cylinder 121 with a length several times the thickness of the detection module cylinder 12 can be processed at one time, and then multiple sections that conform to the thickness of the detection module cylinder 12 can be cut to ensure that the volume and shape of the sealed cavity 14 are consistent.

[0046] Meanwhile, a large notch is made by removing material at one end of the axial groove; if multiple slotted cylinders 121 are processed at once, the large notch is processed after cutting; if a slotted cylinder 121 for a detection module cylinder 12 is processed at once, the lower middle part of the material can be removed first to form an axial groove; then, a large notch is made by removing material at one end of the axial groove.

[0047] Step 2: Weld plate 122 and slotted cylinder 121 to form a sealed cavity 14 at the axial through groove; the cross-sectional shape of the axial through groove is crescent-shaped or fan-shaped to meet the usage requirements.

[0048] Step 3: Install sensor 161 and oil circuit control valve 162 inside the large gap. The outlet of oil circuit control valve 162 is connected to the sealed cavity 14.

[0049] Step 4: Drill a cable hole 123 in the center of the cylinder. The cable of sensor 161, the cable of oil circuit control valve 162, and the oil pipe are led out through the cable hole 123. The cable is then connected to the central cable 17 and led out for control.

[0050] Step 5: Fill the sealed cavity 14 with silicone oil through the oil circuit control valve 162, then close the oil circuit control valve 162; thus forming the detection module column 12. The oil circuit and circuit control here are well-known technologies and will not be described in detail.

[0051] In this example, a lifting beam 15 is installed on the top cap 11.

[0052] In this example, the detection module column 12 is made of stainless steel. Of course, the top cap 11, the lifting beam 15, and the base 13 can also be made of stainless steel.

[0053] like Figures 2 to 5As shown, the sealed cavities 14 of the three detection module columns 12 are evenly distributed circumferentially, meaning that adjacent sealed cavities 14 form a 120-degree angle with each other in the axial projection direction. Simultaneously, the detection module column 12 is divided into two parts: one part is a sealed cavity 14 filled with silicone oil, and the other part is a solid steel column. The internal volume of the sealed cavity 14 can only sense strain changes from the direction directly in front of the chamber. The three adjacent sealed cavities 14 form a 120-degree angle with each other in the axial projection direction, perfectly realizing the design principle of three-component volumetric strain. Moreover, each detection module column 12 is a module, avoiding the loss of the entire underground probe due to damage to a single cavity. If a detection module column 12 malfunctions, this module can be replaced for repair.

[0054] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A modular three-component volumetric strain gauge, comprising an underground probe; characterized in that, The underground probe includes a top cap (11) coaxially assembled from top to bottom, three identical detection module columns (12) and a base (13). The detection module column (12) has a sealed cavity (14) on one radial side inside; the sealed cavities (14) of the three detection module columns (12) are evenly distributed circumferentially in the axial projection direction; The detection module column (12) is also provided with a control cavity (16), and a sensor (161) and an oil circuit control valve (162) are provided in the control cavity (16). The outlet of the oil circuit control valve (162) is connected to the sealed cavity (14) and fills the sealed cavity (14) with silicone oil. After the silicone oil is filled, the oil circuit control valve (162) is closed to seal the sealed cavity (14). The sensor (161) detects the change in silicone oil pressure in the sealed cavity (14).

2. The modular three-component strain gauge according to claim 1, characterized in that, The sealed cavity (14) is located in a circumferential 120-degree sector area.

3. The modular three-component strain gauge according to claim 2, characterized in that, The cross-sectional shape of the sealed cavity (14) is arc-shaped, crescent-shaped, or fan-shaped.

4. The modular three-component micro-strain gauge according to claim 1, 2, or 3, characterized in that, The top cap (11) is equipped with a lifting beam (15).

5. The modular three-component strain gauge according to claim 1, 2, or 3, characterized in that, The main body of the detection module column (12) is machined into a cylinder: Step 1: Remove material in a 120-degree sector area on one side of the cylinder to form an axial through groove, forming a slotted cylinder (121), and remove material at one end of the axial through groove to create a large notch; Step 2: Weld a plate (122) to a slotted cylinder (121) at the axial through groove to form a sealed cavity (14); Step 3: Install sensor (161) and oil circuit control valve (162) inside the large gap. The outlet of oil circuit control valve (162) is connected to the sealed cavity (14). Step 4: Drill a cable hole (123) in the center of the cylinder. The cable of the sensor (161) and the cable and oil pipe of the oil circuit control valve (162) are led out through the cable hole (123). Step 5: Fill the sealed cavity (14) with silicone oil through the oil circuit control valve (162) and then close the oil circuit control valve (162); thus forming the detection module column (12).

6. The modular three-component strain gauge according to claim 5, characterized in that, Also includes: Step 6: Use a plate (122) to weld a slotted cylinder (121) at the large gap to form a control cavity (16); after welding, a detection module cylinder (12) shell with a cylindrical shape is formed.

7. The modular three-component strain gauge according to claim 5, characterized in that, The cross-sectional shape of the notch is arc-shaped, crescent-shaped, or fan-shaped.

8. The modular three-component micro-strain gauge according to claim 1, 2 or 3, characterized in that, The detection module column (12) is made of stainless steel.

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