Three-dimensional stress long-term measuring device capable of being dismounted without damage and mounting and dismounting method thereof

Abstract

The invention relates to a lossless detachable three-dimensional stress long-term measuring device and a dismounting method thereof. The lossless detachable three-dimensional stress long-term measuring device comprises a force transmission shaft, a strain elastomer and an arc-shaped base, the strain elastic body is provided with an unclosed groove which is distributed in the circumferential direction of the force transmission shaft and is of a multi-face structure. The grooves on the two different strain elastomers are different in shape, but the grooves on the two strain elastomers at least comprise a 0-degree surface, a 45-degree surface and a 90-degree surface; resistance strain gauges are arranged on the side walls, corresponding to the 0-degree face, the 45-degree face and the 90-degree face in the groove, of the strain elastic body. The three-dimensional stress long-term measuring device is compact and reasonable in structure and convenient to operate, through the internal structure design, the force transmission shaft deforms to drive the strain elastomer to deform synchronously, the resistance strain gauges are pasted to the sensitive area of the strain elastomer, the three-dimensional stress long-term measuring device can achieve integrated measurement, and the strain gauges do not need to be pasted to a measured structure any more. The device has the advantages of being detachable, long in service life and convenient to calibrate and maintain.

Description

Technical Field

[0001] The invention relates to the technical field of metal structure strain measurement, in particular to a non-destructively disassembled three-axis stress long-term measurement device and a disassembly method thereof. Background Art

[0002] The distribution and changes of stress in ships, marine structures, large bridges and other structures directly reflect the health of the structures. Long-term and reliable measurements of the stress response of the structures during use can be used to evaluate the safety status of the structures. Given that the objects being measured are complex structures such as ships and offshore platforms, and the complexity of the stress-strain characteristics of the local structures, it is often necessary to measure their stress states in three axes over a long period of time.

[0003] The existing three-dimensional stress long-term measurement device adopts the on-site patch method. Due to the influence of the on-site construction environment, the long-term measurement reliability of the on-site patch cannot be guaranteed, and the installation process is not convenient enough. In addition, in the on-site patch method, when a problem occurs in the measurement device, the original strain gauge and accessories need to be removed, and rapid maintenance cannot be performed. In addition, due to the limitations of the on-site patch construction method, the on-site patch-type three-dimensional stress long-term measurement device cannot be accurately calibrated, and the accuracy of the measurement data cannot be verified. After long-term use, the reliability is poor, which affects the measurement accuracy. Therefore, it is necessary to invent a more reliable and durable measurement device that is easy to disassemble without damage.

[0004] Therefore, we propose a non-destructively disassembled three-axis stress long-term measurement device and its disassembly and assembly method. Summary of the invention

[0005] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a non-destructively disassembled three-dimensional stress long-term measurement device and its disassembly and assembly method, designs two strain elastic bodies and respectively opens grooves containing 0-degree, 45-degree and 90-degree surfaces on them, and combines the installation of strain sensors to achieve accurate measurement of the three-dimensional stress of the measured structure. This design not only improves the comprehensiveness of the measurement, but also improves the space utilization rate by optimizing the structural layout of the strain elastic body, making the measurement device more compact and efficient.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A non-destructively detachable three-axis stress long-term measurement device, which is used to measure the stress of a measured structure, comprises:

[0008] A force transmission shaft, which is vertically fixedly connected to a position to be measured on the structure to be measured;

[0009] The strain elastic bodies are at least two in number and are sleeved in parallel on the force transmission shaft;

[0010] An arc-shaped base, which is fixedly connected to the structure to be measured and connected to the strain elastic body, and is used to root the strain elastic body;

[0011] The strain elastic body is provided with unclosed grooves distributed along the circumference of the force transmission axis and presenting a multi-faceted structure;

[0012] The shapes of the grooves on the two different strain elastic bodies are different, but the grooves on the two strain elastic bodies at least include surfaces of 0 degrees, 45 degrees and 90 degrees;

[0013] Resistance strain gauges are arranged on the side walls of the strain elastic body corresponding to the 0 degree, 45 degree and 90 degree surfaces in the groove.

[0014] Furthermore, there are two strain elastic bodies, and the two strain elastic bodies are connected to each other.

[0015] Furthermore, one of the grooves on the strain elastic body includes surfaces at 0 degrees and 90 degrees.

[0016] Furthermore, the strain elastic body is provided with a resistance strain gauge installation position for installing the resistance strain gauge, and the strain elastic body is provided with a force transmission shaft connecting hole for passing the force transmission shaft, and the inner diameter of the force transmission shaft connecting hole is infinitely close to the outer diameter of the force transmission shaft.

[0017] Furthermore, a through hole is provided between the groove and the installation position of the resistance strain gauge, and the through hole is in an "8" shape, thereby improving the ductility of the resistance strain gauge.

[0018] Furthermore, the distance between the surface of the groove corresponding to the installation of the resistance strain gauge and the force transmission axis is ≤ the distance between the other surfaces of the groove and the force transmission axis.

[0019] Furthermore, the measuring device also includes:

[0020] A protective cover, which covers the strain elastic body, and a cavity corresponding to the strain elastic body is opened in the protective cover;

[0021] A sleeve is plugged into the side wall of the protective cover, and a threading hole is provided in the sleeve to facilitate the threading of the wire harness;

[0022] The extension shaft is connected to the upper end of the force transmission shaft with a detachable wire to ensure that the force transmission shaft can stably transmit the deformation of the measured structure;

[0023] A wiring bracket is connected to one end of the sleeve extending to the protective cover, and the wiring bracket is connected to one of the strain elastic bodies through a support column;

[0024] The bottom cover plate is connected to the bottom wall of the strain elastic body below to form a closed space.

[0025] A method for installing a non-destructively detachable long-term three-dimensional stress measuring device also includes a welding jig and a measuring point positioning plate.

[0026] A method for installing a non-destructively disassembled three-axis stress long-term measurement device comprises the following steps:

[0027] S1. Determine the stress measurement position on the measured structure, and determine the position of the arc base and the force transmission axis on the measured structure by using the measurement point positioning plate;

[0028] S2. Fix the welding jig on the arc-shaped base, install the force transmission shaft into the welding jig, tighten the two shaft end faces, and weld the arc-shaped base and the force transmission shaft to the structure to be measured by welding;

[0029] S3, connecting the wiring bracket and the bottom cover plate to the corresponding strain elastic body;

[0030] S4, putting a protective cover on the combined structure assembled in S3, and filling the protective cover with sealant;

[0031] S5. Sleeve the strain elastic body on the force transmission shaft, and connect the strain elastic body to the arc base through a screw assembly to complete the installation.

[0032] A method for disassembling a non-destructively disassemblyable three-axis stress long-term measurement device comprises the following steps:

[0033] SS1. Unscrew the screw assembly between the strain elastic body and the arc base;

[0034] SS2. Lift the strain elastic body upward along the axial direction of the force transmission shaft, so that the strain elastic body is separated from the force transmission shaft to achieve disassembly.

[0035] The beneficial effects of the present invention are as follows:

[0036] The invention has a compact and reasonable structure and is easy to operate. Through the internal structure design, the deformation of the force transmission shaft drives the strain elastic body to deform synchronously. The resistance strain gauge is attached to the sensitive area of ​​the strain elastic body. The three-axis stress long-term measurement device can realize integrated measurement, and the strain gauge is no longer required to be attached to the measured structure. The device realizes the characteristics of detachability, long-term, easy calibration and maintenance.

[0037] At the same time, the present invention also has the following advantages:

[0038] 1. Capability of accurate measurement of multi-directional stress

[0039] The three-dimensional stress long-term measurement device in this embodiment realizes accurate measurement of the three-dimensional stress of the measured structure by designing two strain elastic bodies and opening grooves containing 0 degree, 45 degree and 90 degree surfaces on them respectively, combined with the installation of resistance strain gauges. This design not only improves the comprehensiveness of the measurement, but also improves the space utilization rate by optimizing the structural layout of the strain elastic body, making the measurement device more compact and efficient. This ability to accurately measure multi-directional stress is of great significance for structural analysis under complex stress states, and can provide reliable data support for engineering design and safety assessment.

[0040] 2. High-precision stress response and transmission

[0041] The close fit between the force transmission shaft and the strain elastic body in the device, as well as the close design of the inner diameter of the force transmission shaft connection hole and the outer diameter of the force transmission shaft, ensures efficient stress transmission. At the same time, the "8"-shaped through hole opened on the strain elastic body further improves the ductility of the resistance strain gauge, enabling it to respond to stress changes more sensitively. This high-precision stress response and transmission mechanism ensures the accuracy and real-time nature of the measurement data.

[0042] 3. Convenient non-destructive disassembly and maintenance

[0043] The measuring device in this embodiment adopts a non-destructive disassembly design, which makes it extremely convenient to calibrate, maintain or replace components when necessary. The strain elastic body and the arc base can be separated by a simple screw assembly operation without destroying the measured structure itself. This design not only extends the service life of the measuring device, but also reduces maintenance costs and improves the overall economic benefits of the equipment. In addition, the detachability also facilitates the upgrading or modification of the measuring device to meet different measurement needs.

[0044] 4. Corrosion and rust protection

[0045] The protective cover in the device is made of corrosion-resistant, high-strength metal material, providing a good protective barrier for the internal measuring elements. At the same time, the arc base is blackened to effectively isolate air and moisture and improve rust resistance. This corrosion and rust protection measure ensures the long-term stable operation of the measuring device in harsh environments and reduces the measurement error and failure risk caused by environmental factors. This is especially important for structural monitoring outdoors or under harsh working conditions.

[0046] 5. Compact structure and easy installation

[0047] The measuring device in this embodiment has a compact structure, and the components fit closely together, making installation easy and quick. Through the auxiliary installation of the welding jig, the verticality and stability of the force transmission shaft and the arc base can be ensured, and the installation accuracy is improved. At the same time, the design of auxiliary components such as the wiring bracket, sleeve and bottom cover plate also fully considers the convenience of on-site installation, making the assembly process of the entire measuring device smoother and more efficient. This compact structure and easy installation improve the application flexibility and adaptability of the measuring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a top view of the present invention.

[0049] Figure 2 for Figure 1 Middle AA section view.

[0050] Figure 3 for Figure 1 Middle BB section view.

[0051] Figure 4 It is a schematic diagram of the connection structure between the first strain elastic body and the protective cover.

[0052] Figure 5 Schematic diagram of the structure of the measuring point positioning board.

[0053] Figure 6 Schematic diagram of the structure of the first strain elastic body.

[0054] Figure 7 Schematic diagram of the structure of the second strain elastic body.

[0055] Figure 8 It is a schematic diagram of the connection structure between the arc-shaped base, welding jig and force transmission shaft during installation.

[0056] In the figure: 1. protective cover; 2. sleeve; 3. extension shaft; 4. force transmission shaft; 401. force transmission shaft connecting hole; 5. arc base; 6. welding jig; 7. first strain elastic body; 701. first groove structure; 702. first through hole; 8. second strain elastic body; 801. second groove structure; 802. second through hole; 9. wiring bracket; 10. bottom cover plate; 11. gasket; 12. support column; 13. measuring point positioning plate; 14. measured structure; 15. force measurement point welding place; 16. resistance strain gauge installation position. DETAILED DESCRIPTION

[0057] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0058] like Figure 1-Figure 4 as well as Figure 6-Figure 7As shown, the non-destructively detachable three-axis stress long-term measurement device of this embodiment is used to measure the stress of the measured structure 14, and includes a force transmission shaft 4, a strain elastic body and an arc base 5.

[0059] In this embodiment, the structure 14 to be measured is usually a location that is subjected to stress.

[0060] Specifically, the force transmission shaft 4 is vertically fixedly connected to the position to be measured of the measured structure 14;

[0061] The strain elastic bodies are at least two in number and are sleeved in parallel on the force transmission shaft 4;

[0062] The arc-shaped base 5 is fixedly connected to the measured structure 14 and connected to the strain elastic body, and is used to root the strain elastic body, that is, to provide a fixed installation position for the strain elastic body to prevent the strain elastic body from moving synchronously with the force transmission shaft 4 and affecting the measurement;

[0063] The strain elastic body is provided with unclosed grooves distributed in the circumferential direction along the force transmission axis and presenting a multi-faceted structure;

[0064] Through the design of the groove, the stress of the force transmission shaft 4 can be clamped and fed back to the strain elastic body in time. It is also because of the existence of the groove that the strain elastic body has a certain elasticity and can respond to stress changes in time, facilitating the response of the subsequent stress sensor.

[0065] The shapes of the grooves on the two different strain elastic bodies are different, but the grooves on the two strain elastic bodies include at least three angles. The three angles in this embodiment are 0 degree, 45 degree and 90 degree surfaces, which can ensure that 0 degree and 90 degree are in a vertical plane, so that 0 degree and 90 degree are distributed on the same strain elastic body;

[0066] Resistance strain gauges are arranged on the strain elastic body corresponding to the different angle surfaces in the groove.

[0067] By setting resistance strain gauges at 0 degree, 45 degree and 90 degree directions of the strain elastic body, the detection of three-axis stress can be achieved.

[0068] In this embodiment, the number of strain elastic bodies is two, namely, a first strain elastic body 7 and a second strain elastic body 8, and the two strain elastic bodies are connected to each other by a screw assembly, and a washer with a thickness of 3 mm is added to the second strain elastic body 8 and the first strain elastic body 7 to maintain the verticality of the device;

[0069] In this embodiment, a first groove structure 701 is provided in the first strain elastic body 7, and a second groove structure 801 is provided in the second strain elastic body 8;

[0070] In this embodiment, the groove on the first strain elastic body 7 is a rectangular structure and includes 0 degree and 90 degree surfaces. The resistance strain gauges corresponding to 0 degree and 90 degree are arranged in the same strain elastic body, which can improve space utilization.

[0071] In this embodiment, an inclined surface is provided on the groove on the second strain elastic body 8, and the angle between the inclined surface and the horizontal plane / vertical plane is 45 degrees. A resistance strain gauge is provided on the side wall of the second strain elastic body 8 corresponding to the inclined surface.

[0072] In another embodiment, the number of strain elastomers is three. At this time, since the number of strain elastomers is three, the surface selection space of the three angles of the groove is larger and can be considered as any angle, such as 0 degrees, 60 degrees, 120 degrees, 0 degrees, 30 degrees, 60 degrees. The corresponding strain force can be obtained through the trigonometric function relationship. However, based on actual use, the degree in the middle of the range is usually half of the first two degrees to improve measurement accuracy.

[0073] In this embodiment, a resistance strain gauge installation position 16 for installing a resistance strain gauge is provided on the strain elastic body, and a force transmission shaft connecting hole 401 is provided on the strain elastic body for passing the force transmission shaft 4. The inner diameter of the force transmission shaft connecting hole 401 is infinitely close to the outer diameter of the force transmission shaft 4, ensuring that the strain elastic body can respond to the transmission of force in a timely manner, thereby improving the measurement accuracy.

[0074] In this embodiment, a through hole is opened between the groove and the resistance strain gauge installation position 16, and the through hole is in the shape of an "8". The first through hole 702 is in the first strain elastic body 7, and the second through hole 802 is in the second strain elastic body 8. The ductility of the resistance strain gauge is improved, which facilitates the resistance strain gauge to respond to the stress changes of the force transmission shaft 4 in a timely manner, thereby improving the measurement accuracy.

[0075] In this embodiment, the distance between the surface of the groove corresponding to the installation of the resistance strain gauge and the force transmission axis 4 is ≤ the distance between the other surfaces of the groove and the force transmission axis 4.

[0076] The non-destructively detachable three-axis stress long-term measurement device in this embodiment further includes:

[0077] A protective cover 1 is covered outside the strain elastic body, and a cavity corresponding to the strain elastic body is opened in the protective cover 1;

[0078] The sleeve 2 is plugged into the side wall of the protective cover 1, and a threading hole is provided in the sleeve 2 to facilitate the threading of the wire harness;

[0079] The extension shaft 3 is detachably connected to the upper end of the force transmission shaft 4 to ensure that the force transmission shaft 4 can stably transmit the deformation of the measured structure 14;

[0080] A wiring bracket 9, which is connected to one end of the sleeve 2 extending to the protective cover 1, and the wiring bracket 9 is connected to one of the strain elastic bodies through a support column 12;

[0081] The bottom cover plate 10 is connected to the bottom wall of the strain elastic body below to form a closed space.

[0082] The internal structure is composed of a first-layer wiring bracket 9, a second-layer second strain elastic body 8, and a third-layer first strain elastic body 7. The force transmission shaft 4 is fastened to the three layers by a screw assembly. When the measured structure 14 is deformed by force, the force transmission shaft 4 and the arc base 5 are driven to change displacement. The change in displacement between the force transmission shaft 4 and the arc base 5 causes the first strain elastic body 7 and the second strain elastic body to deform synchronously, and the resistance strain gauge attached to the strain elastic body is deformed. Among them, the first strain elastic body 7 can achieve 0 degree and 90 degree strain; the second strain elastic body 8 can achieve 45 degree strain;

[0083] The wiring bracket 9 is welded to the sleeve 2 as a whole, and the resistance strain gauge wiring passes through the threading hole of the wiring bracket 9 and then passes through the sleeve 2 to connect the wire.

[0084] The bottom cover plate 10 is fastened to the first strain elastic body 7 via a screw assembly, and the strain elastic body area can be sealed to form protection.

[0085] The extended shaft 3 and the force transmission shaft 4 are installed in the welding jig 6, and the end faces of the two shafts are tightened. The arc base 5 and the welding jig 6 screw assembly are tightened. Check that the force transmission shaft 4 can be pulled up and down smoothly to ensure the verticality of the welding.

[0086] The arc-shaped base 5 is blackened, is not oxidized, and is completely isolated from the air, thereby improving the anti-rust ability and reducing the deformation of the base caused by some internal or external forces.

[0087] The force transmission shaft 4 and the arc base 5 are welded on the measured structure 14, and the three-axis stress long-term measurement device can be removed for calibration, maintenance and replacement.

[0088] Specifically, the shield 1 in this embodiment is made of corrosion-resistant, high-strength metal material and is used to protect the internal measuring elements from the influence of the external environment.

[0089] The specific working principle is as follows:

[0090] The resistance strain gauges are pasted on the three areas of the strain elastic body at 0 degrees, 45 degrees, and 90 degrees, and are formed into resistance strain gauges through wiring brackets and connected to the wires; the arc base 5 and the force transmission shaft 4 are welded in the stress concentration area through the welding jig 6. After the three-axis stress long-term measurement device is installed, when the measured structure is deformed by force, the force transmission shaft 4 and the arc base 5 are driven to change in displacement. The change in displacement between the force transmission shaft 4 and the arc base 5 causes the first strain elastic body 7 and the second strain elastic body 8 to produce synchronous deformation, and the resistance strain gauge connected to the strain elastic body is deformed, so that the deformation size of the measured part can be obtained.

[0091] Embodiment 2

[0092] A method for installing a non-destructively detachable long-term three-dimensional stress measuring device, further comprising welding a jig 6 and a measuring point positioning plate 13, comprising the following steps:

[0093] S1, such as Figure 5 As shown, the stress measurement position on the measured structure 14 is determined, and the positions of the arc base 5 and the force transmission shaft 4 are determined on the measured structure 14 by using the measurement point positioning plate 13;

[0094] S2, such as Figure 8 As shown, the welding jig 6 is fixed on the arc base 5, and the force transmission shaft 4 is installed in the welding jig 6 and the two shaft end faces are tightened, and the arc base 5 and the force transmission shaft 4 are welded to the measured structure 14 by welding;

[0095] S3, connecting the wiring bracket 9 and the bottom cover plate 10 to the corresponding strain elastic body;

[0096] S4, putting a protective cover 1 on the combined structure assembled in S3, and filling the protective cover 1 with sealant;

[0097] S5. Sleeve the strain elastic body on the force transmission shaft 4, and connect the strain elastic body to the arc base 5 through a screw assembly to complete the installation.

[0098] The following is specifically described by taking the case where the measured structure 14 is a ship as an example:

[0099] Preparation before installation: According to the ship design drawings and on-site survey results, determine the location of the measurement point and make a measurement point positioning plate 13, such as Figure 5 As shown, it is a T-shaped structure, and circular holes are arranged at each end, corresponding to the installation holes of the force transmission shaft 4 and the arc base 5 respectively.

[0100] Welding base: The arc-shaped base 5 is precisely welded to the predetermined position of the ship through the welding jig 6 to ensure that the welding quality meets the standards.

[0101] Assembling device: assemble the extension shaft 3, the force transmission shaft 4, the first strain elastic body 7, the second strain elastic body 8, the wiring bracket 9 and other components in place in sequence, and fasten them with screw assemblies.

[0102] Debugging and calibration: Use standard loading equipment to perform load tests on the device, and adjust the device parameters by comparing theoretical values ​​with measured values ​​until the measurement accuracy requirements are met.

[0103] Sealing protection: Install the bottom cover plate 10 and use sealing material to seal the first strain elastic body 7 area.

[0104] Connecting wires: Lead the wires of the resistance strain gauge through the wire holes of the wiring bracket 9 and the sleeve 2 to the data acquisition system and make electrical connections.

[0105] At the same time, the following requirements must be met during the installation process:

[0106] (1) The elastomer material of the present invention is 17-4PH, which fully utilizes the performance of the elastic element, and the hardness, strength and toughness of the heat-treated elastic element meet better performance requirements;

[0107] (2) The present invention welds the arc base and the force transmission shaft 4 to the accurate position by measuring the point positioning plate, the welding jig and the extension shaft, thereby ensuring the verticality of the force transmission shaft 4 after welding;

[0108] (3) The present invention welds the wiring bracket and the sleeve together, welds the wiring terminal to the resistance strain gauge lead wire, and enters the internal threaded sleeve through the threading hole;

[0109] (4) During processing, the arc-shaped base is blackened to prevent oxidation and completely isolate it from the air, thereby improving the anti-rust ability and reducing the deformation of the base caused by some internal or external forces;

[0110] (5) During processing, the wiring bracket and the second strain elastic body 8 are added with a 3 mm thick washer to maintain the verticality of the device;

[0111] (6) During processing, the second strain elastic body 8 and the first strain elastic body 7 are added with a 3 mm thick gasket to maintain the verticality of the device;

[0112] (7) The bottom cover plate is fastened to the first strain elastic body by a screw assembly, which protects the interior of the three-axis stress long-term measurement device and can also inspect the welding of the force transmission shaft 4.

[0113] (8) A through hole is opened inside the elastic body to reduce the wall thickness of the strain gauge pasting position. When the force transmission shaft 4 and the arc base 5 are displaced and a compressive load is applied, the left side of the sensitive area of ​​the 90-degree strain elastic body is in a compressed state and the right side is in a stretched state; when the force transmission shaft 4 and the arc base are stretched, the left side of the sensitive area of ​​the 90-degree strain elastic body is in a stretched state and the right side is in a compressed state.

[0114] In this embodiment, specifically:

[0115] By using the measuring point positioning plate 13 to mark the positions of the arc base 5 and the force transmission shaft 4 on the measured structure 14, the force transmission shaft 4 and the extension shaft 3 are installed into the welding jig 6 and the end faces of the two shafts are tightened. The screw assembly of the arc base 5 and the welding jig 6 is tightened. Check that the force transmission shaft 4 can be pulled up and down smoothly to ensure the verticality of the welding. The chamfered area at the bottom of the force transmission shaft 4, that is, the force measuring point welding point 15 and the outer side of the arc base 5 are fully welded by argon arc welding. After cooling, the extension shaft 3 and the welding jig 6 are removed, and the base positioning welding is completed.

[0116] Add a washer 11 between the first strain elastic body 7 and the second strain elastic body to ensure stability, and tighten it with a screw assembly. Add a support column 12 between the second strain elastic body and the wiring bracket 9 to ensure stability, and tighten it with a screw assembly. Then install the protective cover 1 and fasten it with the first strain elastic body 7 with a screw assembly. The bottom cover 10 is fastened with the first strain elastic body 7 with a screw assembly. The assembled three-axis stress long-term measurement device is fastened with the welded arc base 5 with a screw assembly to complete the installation of the three-axis stress long-term measurement device.

[0117] When the measured structure 14 is deformed by force, the force transmission shaft 4 and the arc base 5 are displaced accordingly. The displacement change between the force transmission shaft 4 and the arc base 5 causes the first strain elastic body 7 and the second strain elastic body to deform synchronously, and the resistance strain gauge attached to the strain elastic body is deformed, and the resistance value changes. After being processed by the measuring circuit, the resistance value is converted into an electrical signal. The deformation size of the measured part can be calculated.

[0118] In actual use, the first strain elastic body 7, the second strain elastic body, the wiring bracket 9, and the bottom cover plate 10 are firstly ensured to be at the same verticality through the force transmission shaft 4 to ensure good coaxiality. Before installation, the three-axis stress long-term measurement device can be fully filled with sealant to protect the bottom cover plate 10 and extend the service life of the three-axis stress long-term measurement device.

[0119] Embodiment 3

[0120] A method for disassembling a non-destructively disassembled three-axis stress long-term measurement device, based on the second embodiment, comprises the following steps:

[0121] SS1, unscrew the screw assembly between the strain elastic body and the arc base 5;

[0122] SS2. Lift the strain elastic body upward along the axial direction of the force transmission shaft 4, so that the strain elastic body is separated from the force transmission shaft 4 to achieve disassembly.

[0123] When the measuring device needs regular calibration or maintenance after long-term use, the screw assembly can be removed to dismantle the three-axis stress long-term measuring device for inspection, and the positions of the force transmission shaft 4 and the arc base 5 remain unchanged, thereby completing the feature of the three-axis stress long-term measuring device that can be non-destructively disassembled in harsh environments.

[0124] In view of the extreme harsh marine environment, the present invention has invented a set of calibrable, repeatedly disassembled and assembled, highly sensitive and highly precise three-axis stress long-term measurement device, thereby achieving the characteristics of easy disassembly, calibration and maintenance.

[0125] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A non-destructively disassembled three-dimensional stress long-term measurement device, which is used to measure the stress of a measured structure (14), characterized in that: include: A force transmission shaft (4) which is vertically fixedly connected to a position to be measured of a measured structure (14); The strain elastic bodies are at least two in number and are sleeved in parallel on the force transmission shaft (4); An arc-shaped base (5) is fixedly connected to the structure to be measured (14) and connected to the strain elastic body, and is used to root the strain elastic body; The strain elastic body is provided with unclosed grooves distributed in the circumferential direction of the force transmission axis (4) and presenting a multi-faceted structure; and the shapes of the grooves on two different strain elastic bodies are different, but the grooves on the two strain elastic bodies include at least three faces with different angles; The strain elastic body is provided with resistance strain gauges on the side walls corresponding to the different angle surfaces in the groove.

2. A non-destructively disassembled three-axis stress long-term measurement device as claimed in claim 1, characterized in that: The number of the strain elastic bodies is two, and the two strain elastic bodies are connected to each other.

3. A non-destructively disassembled three-axis stress long-term measurement device as claimed in claim 1, characterized in that: The grooves on the two strain elastic bodies include three angles of 0 degree, 90 degree and 45 degree, and the groove on one of the strain elastic bodies includes surfaces of 0 degree and 90 degree.

4. A non-destructively disassembled three-axis stress long-term measurement device as claimed in claim 1, characterized in that: The strain elastic body is provided with a resistance strain gauge installation position (16) for installing the resistance strain gauge, and the strain elastic body is provided with a force transmission shaft connecting hole (401) for passing the force transmission shaft (4), and the inner diameter of the force transmission shaft connecting hole (401) is infinitely close to the outer diameter of the force transmission shaft (4).

5. A non-destructively disassembled three-axis stress long-term measurement device as claimed in claim 4, characterized in that: A through hole is provided between the groove and the resistance strain gauge installation position (16), and the through hole is in an "8" shape, which reasonably reduces the wall thickness and improves the ductility of the resistance strain gauge.

6. The non-destructively disassembled three-axis stress long-term measurement device according to claim 1, characterized in that: The distance between the surface of the groove corresponding to the installation of the resistance strain gauge and the force transmission axis (4) is less than or equal to the distance between the other surfaces of the groove and the force transmission axis (4).

7. A non-destructively detachable three-axis stress long-term measurement device according to any one of claims 1 to 6, characterized in that: Also includes: A protective cover (1) is covered outside the strain elastic body, and a cavity corresponding to the strain elastic body is opened in the protective cover (1); A sleeve (2) is plugged into the side wall of the protective cover (1), and a threading hole is provided in the sleeve (2) to facilitate the threading of the wire harness; The extension shaft (3) is detachably connected to the upper end of the force transmission shaft (4) to ensure that the force transmission shaft (4) can stably transmit the deformation of the measured structure (14); A wiring bracket (9), which is connected to one end of the sleeve (2) extending to the protective cover (1), and the wiring bracket (9) is connected to one of the strain elastic bodies through a support column (12); The bottom cover plate (10) is connected to the bottom wall of the strain elastic body below and is used to form a closed space.

8. A method for installing the non-destructively detachable long-term three-axis stress measurement device according to claim 7, characterized in that: It also includes a welding jig (6) and a measuring point positioning plate (13).

9. The method for installing a non-destructively detachable long-term three-axis stress measurement device according to claim 8, characterized in that: The steps include: S1, determining the stress measurement position on the measured structure (14), and determining the positions of the arc base (5) and the force transmission shaft (4) on the measured structure (14) by using the measurement point positioning plate (13); S2, fixing the welding jig (6) on the arc-shaped base (5), and installing the force transmission shaft (4) into the welding jig (6) and tightening the two shaft end faces, and welding the arc-shaped base (5) and the force transmission shaft (4) to the measured structure (14) by welding; S3, connecting the wiring bracket (9) and the bottom cover plate (10) to the corresponding strain elastic body; S4, putting a protective cover (1) on the combined structure assembled in S3, and filling the protective cover (1) with sealant; S5. Sleeve the strain elastic body on the force transmission shaft (4), and connect the strain elastic body to the arc base (5) through a screw assembly to complete the installation.

10. The method for disassembling a non-destructively disassembled three-axis stress long-term measurement device according to claim 9, characterized in that: The steps include: SS1, unscrew the screw assembly between the strain elastic body and the arc base (5); SS2. Lift the strain elastic body upward along the axial direction of the force transmission shaft (4), so that the strain elastic body is separated from the force transmission shaft (4) to achieve disassembly.

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