Static load and salt erosion coupling test device

Abstract

The invention relates to the technical field of civil engineering material durability test application, in particular to a static load and salt erosion coupling test device which comprises a bottom plate, a pressure assembly and a salt erosion box. According to the device, a jack, a top plate, an upper middle plate and a lower middle plate in a pressure assembly are used as a static load system, a salt erosion box and a test piece and a cushion block in the salt erosion box are used as a salt erosion system, and the static load system and the salt erosion system are organically combined, so that the coupling test of static load and salt erosion is realized. The test piece is subjected to a static load applied by the jack and is also in an erosion solution environment in the salt erosion box, so that the real stress and corrosion state of a material or a structure under the combined action of the static load and salt erosion in actual engineering can be accurately represented. The simulation of the coupling effect makes up for the defect that a single static load or salt erosion test cannot reveal the coupling effect, provides an important experimental platform for researching a failure mechanism in a complex environment, and enables a test result to be more representative and reliable.

Description

Technical Field

[0001] This invention relates to the field of durability testing technology for civil engineering materials, specifically a static load and salt erosion coupled test device. Background Technology

[0002] The static load-salt erosion coupled testing apparatus is an important tool in the field of durability testing of civil engineering materials, mainly used to simulate the performance changes of materials under the combined effects of static load and salt erosion. In practical engineering, many materials and structures, such as bridges in marine environments, harbor facilities, and building structures in western saline soil regions, are often subjected to the dual effects of static load and salt erosion simultaneously. Therefore, accurately assessing the durability of materials under these complex environments is crucial for engineering design and maintenance. However, existing testing apparatuses have many shortcomings in simulating this coupled effect.

[0003] Existing testing equipment is mainly divided into three categories: independent testing devices, simple coupled devices, and simulated environmental test chambers. Independent testing devices perform static load tests and salt erosion tests separately; for example, static load tests are conducted using a pressure machine or universal testing machine, while salt erosion tests are conducted using a salt spray chamber or immersion device. This type of device cannot simultaneously apply static load and salt erosion to the sample in the same test, resulting in test results that do not accurately reflect the material's performance under actual working conditions. While simple coupled devices attempt to combine static load and salt erosion, their design is relatively simple and they typically cannot precisely control test conditions, such as the concentration, temperature, and flow rate of the salt solution, as well as the method of applying the static load. This significantly reduces the repeatability and accuracy of the test results. Simulated environmental test chambers, although capable of simulating complex environmental conditions, struggle to simultaneously and precisely control the application and measurement of the static load. Furthermore, the equipment is expensive and complex to operate, failing to meet the demands of high-precision testing.

[0004] The shortcomings of these existing technologies are mainly reflected in the following aspects. First, they are functionally limited and cannot simulate coupled environments. Most test devices only focus on a single factor in either load action or salt erosion, making it difficult to accurately simulate the coupled effect of both in a single experiment. However, in practical applications, load and salt erosion often coexist, especially in marine environments and western saline soil environments, where materials are typically subjected to the combined effects of long-term load and salt erosion. Therefore, existing single test devices cannot comprehensively simulate the long-term durability of materials in real-world environments. Second, environmental control during the test process is inadequate. In traditional static load tests, the salt erosion environment is usually difficult to control precisely or apply simultaneously. While existing salt erosion test devices can simulate brine, they often cannot synchronously control the load action. This leads to instability in the salt erosion effect caused by changes in the brine immersion environment, and the inability to simulate the interaction between load and salt erosion on the material. Furthermore, the equipment is complex and costly. Although simulated environmental test chambers can simulate complex environmental conditions, the equipment is expensive, complex to operate, and cannot simultaneously meet the high-precision testing requirements of static load and salt erosion. Summary of the Invention

[0005] In view of the obvious shortcomings of existing static load and salt erosion test devices in terms of function, environmental control, equipment cost, sample fixation and sealing, and scope of application, which not only limit the in-depth development of material durability research, but also affect the scientificity and rationality of engineering design and maintenance strategies, this invention provides a static load and salt erosion coupled test device.

[0006] The technical solution adopted by this invention to solve its technical problem is: a static load and salt corrosion coupled test device, comprising a base plate, a pressure assembly, and a salt corrosion chamber. Two lead screws are vertically mounted on the top of the base plate. The pressure assembly is adjustablely mounted on the two lead screws. The salt corrosion chamber is placed on top of the base plate and is located directly below the pressure assembly. The base plate serves as the basic support structure for the entire device, providing a stable platform. The lead screws are used to support and adjust the height of the pressure assembly, realizing the lifting function of the pressure assembly.

[0007] The pressure assembly includes a top plate, an upper middle plate, and a lower middle plate. These plates are horizontally and adjustable, mounted on two lead screws from top to bottom. A jack is placed between the top plate and the upper middle plate, and a force-measuring ring is placed between the upper middle plate and the lower middle plate. An adapter is fixed to the bottom of the lower middle plate. The top plate, upper middle plate, and lower middle plate are sequentially mounted on the lead screws, and their height is adjusted by nuts to accommodate different testing requirements. The jack, placed between the top plate and the upper middle plate, applies static load; the force-measuring ring, placed between the upper middle plate and the lower middle plate, measures the applied load; and the adapter, fixed to the bottom of the lower middle plate, transmits pressure to the pressure plate on the specimen.

[0008] The salt corrosion chamber contains test specimens, with a pressure plate placed on top of each specimen, directly below the adapter. The entire device, through the rational design and close coordination of its base plate, lead screw, mounting nut, pressure assembly, salt corrosion chamber, specimen, pad, pressure plate, force-measuring ring, jack, adapter, and lifting ring, achieves a coupled testing function of static load and salt corrosion. During the test, the specimen is subjected to both the static load applied by the jack and the corrosive solution environment within the salt corrosion chamber, accurately reproducing the actual stress and corrosion state of materials or structures under the combined action of static load and salt corrosion in real engineering projects. Furthermore, the rational installation and coordination between the various structures ensure stable operation of the device during testing, avoiding test errors caused by structural loosening or improper fit.

[0009] Preferably, mounting nuts are welded and fixed on both sides of the bottom of the base plate. Two lead screws penetrate the base plate and are threaded into the two mounting nuts respectively. The mounting nuts are used to fix the lead screws, ensuring a secure connection between the lead screws and the base plate and preventing loosening during the test. The use of mounting nuts ensures the reliability of the lead screw fixation, improving the safety and accuracy of the test.

[0010] Preferably, both lead screws pass through the top plate, upper middle plate, and lower middle plate. From top to bottom, each lead screw is sequentially threaded with an upper fixing nut, a lower fixing nut, an upper limit nut, a lower support nut, and a lower limit nut. The top plate is located between the upper and lower fixing nuts, and its height is fixed by these nuts. The upper middle plate is located between the upper limit nut and the lower support nut, and its height is fixed by these nuts. The lower middle plate is supported by two lower limit nuts. The height of the top plate, upper middle plate, and lower middle plate is adjustable through the engagement of the lead screws and nuts. This arrangement makes the overall structure of the pressure assembly compact and flexible. The relative positions of the plates can be precisely adjusted using the nuts, ensuring accurate installation of the jack, force-measuring ring, and adapter.

[0011] Preferably, the test specimens in the salt etching chamber are stacked, with several pads placed under each layer of test specimens. The salt etching chamber contains the etching solution and the specimens, providing a salt etching environment for the specimens. The specimens are the objects of the test, used to study performance changes under the coupled effects of static load and salt etching. The pads are placed under each layer of specimens to ensure stable placement and to ensure that the specimens are completely immersed in the etching solution. A pressure plate is placed on the top layer of specimens to uniformly transfer the load applied by the pressure assembly to the specimens.

[0012] Preferably, the base plate has a placement groove for placing the salt erosion box, and the cross-sectional size of the placement groove is adapted to the cross-sectional size of the salt erosion box. The salt erosion box is placed in the placement groove of the base plate. This design not only ensures the stable placement of the salt erosion box, but also improves the overall stability of the device.

[0013] Preferably, connecting nuts are installed at both the upper and lower ends of the force-measuring ring. An upper groove is formed at the bottom of the upper middle plate, and a lower groove is formed at the top of the lower middle plate. The connecting nuts at both ends of the force-measuring ring are adapted to and aligned with the upper and lower grooves, respectively. The force-measuring ring is used to measure the magnitude of the load applied to the specimen, ensuring precise load control during the test. The connecting nuts at both ends of the force-measuring ring engage with the upper groove of the upper middle plate and the lower groove of the lower middle plate to fix the force-measuring ring and ensure its stability during the test. The engagement of the force-measuring ring with the grooves of the upper and lower middle plates via the connecting nuts ensures that the position of the force-measuring ring within the pressure assembly is fixed and stable.

[0014] Preferably, a slot is provided at the center of the top of the upper plate, and the jack is placed vertically within the slot on the top of the upper plate. The jack is used to apply static load and is a key component for applying load during the test. The slot on the top of the upper plate is used to fix the jack, ensuring its stable placement and vertical installation during the test. This fit ensures that the jack's position within the pressure assembly is fixed and stable, preventing inaccurate load application due to jack loosening.

[0015] Preferably, a positioning groove is formed at the center of the top of the pressure plate, which is aligned vertically with the adapter. The cross-sectional size of the positioning groove is adapted to the lower cross-sectional size of the adapter. The adapter is fixed to the bottom of the lower plate and is used to transfer the load applied by the pressure assembly to the pressure plate on the specimen. The positioning groove on the top of the pressure plate is used to align vertically with the adapter to ensure that the load can be evenly transferred to the specimen.

[0016] Preferably, the top plate is horizontally welded with connecting ribs, and a lifting ring is fixed to the center of the top of the top plate via the connecting ribs. The lifting ring is fixed to the top of the top plate and is used to connect a lifting hook, facilitating the movement of the entire device to a suitable test site.

[0017] The beneficial effects of this invention are:

[0018] (1) In this invention, the device uses the jack, top plate, upper middle plate, and lower middle plate in the pressure assembly as the static load system, and the salt corrosion chamber and the specimens and pads inside as the salt corrosion system. By organically combining the static load system and the salt corrosion system, the coupled test of static load and salt corrosion is realized. During the test, the specimen is subjected to both the static load applied by the jack and the corrosive solution environment in the salt corrosion chamber, which can accurately reproduce the real stress and corrosion state of materials or structures under the combined action of static load and salt corrosion in actual engineering. This simulation of the coupled effect makes up for the insufficiency of single static load or salt corrosion test in revealing the coupling effect, and provides an important experimental platform for studying the failure mechanism under complex environment, making the test results more representative and reliable, and providing a more accurate basis for material selection and structural design in actual engineering.

[0019] (2) In this invention, the device employs a robust specimen fixing system, which securely holds the entire device together via a base plate, lead screw, and mounting nuts. The lead screw passes through the top plate, upper middle plate, and lower middle plate, and each component is precisely fixed and limited by upper fixing nuts, lower fixing nuts, upper limit nuts, lower support nuts, and lower limit nuts, ensuring the stability of the equipment during the test. This avoids data distortion or test interruption caused by equipment problems and improves the success rate of the test.

[0020] (3) In this invention, the device accelerates the corrosion and damage process through the synergistic effect of static load and salt solution. In the experiment, the static load applied by the jack will generate a certain stress on the specimen, while the corrosion solution in the salt corrosion chamber will chemically corrode the specimen. This coupling effect of static load and salt corrosion allows the specimen to produce more obvious corrosion and damage in a shorter time, shortening the cycle of long-term durability research. Through this accelerated testing, the performance of materials can be evaluated more quickly, the application effect of new materials can be verified, and more timely feedback can be provided for the research and development and improvement of materials. This helps to improve the durability and reliability of materials and promote the application of new materials.

[0021] (4) In this invention, the device allows experiments to be conducted under various salt solution types and different load conditions. By adjusting the composition and concentration of the erosion solution in the salt erosion chamber, different types of salt erosion environments can be simulated; by adjusting the loading pressure and loading method of the jack, different load levels can be simulated. In addition, the device can also control parameters such as temperature and humidity of the test environment through other auxiliary equipment. This multi-parameter coupled experimental research capability allows researchers to study the synergistic effects of multiple factors such as load level, salt concentration, ambient temperature, and humidity on structural damage in the same test device, which helps to reveal the material aging mechanism under complex working conditions, construct a predictive model of material degradation, and provide a more comprehensive and scientific basis for material durability assessment and engineering design.

[0022] (5) In this invention, the device integrates static load testing and salt erosion testing into one device through coupled testing, reducing the number and types of equipment required to conduct the two tests separately. Simultaneously, due to the more efficient testing process and shorter testing cycle, testing efficiency is significantly improved, and equipment utilization is greatly enhanced. This integrated and efficient testing method reduces the overall cost of testing, including equipment cost, labor cost, and time cost. By reducing testing costs, this device enables more research institutions and enterprises to conduct coupled static load and salt erosion tests, promoting the popularization and development of material durability research.

[0023] (6) In this invention, the data and patterns generated by the device can provide strong support for load design, material selection, and optimization of protective measures. By simulating the coupling effect of static load and salt corrosion under actual working conditions, the obtained test data is more accurate and reliable, and can truly reflect the changes in the durability of materials during long-term service. This data can help engineers more accurately predict the degree of structural deterioration during service, thereby formulating reasonable maintenance and repair plans, optimizing engineering design and material selection, extending the service life of structures, and reducing engineering maintenance costs. In addition, the device has a wide range of applications and is suitable for testing various fields and materials. In the field of civil engineering, it can be used for durability research on structures such as bridges, tunnels, and harbors; in the field of marine engineering, it can be used for corrosion and load-bearing performance testing of facilities such as ships and offshore platforms; in the field of transportation, it can be used for durability testing of components of vehicles such as automobiles and trains; in the field of chemical containers and energy facilities, it can be used for corrosion and strength assessment of equipment such as storage tanks and pipelines. Through its wide application in these fields, the device can solve key corrosion and load-bearing problems in extreme environments, improve the safety and economic benefits of related industries, and provide technical support and guarantees for the development of various fields. This device provides a unified technical platform for testing the coupled effects of static load and salt erosion. Its innovative structural design and coupled testing process offer a reference for developing industry testing standards. Promoting the application of this device can drive the development and improvement of industry testing standards, fill gaps in existing testing methods, and make the coupled testing of static load and salt erosion more scientific, standardized, and unified.

[0024] (7) The static load and salt corrosion coupled test device of the present invention has a structural design that fully considers the convenience of disassembly, assembly, maintenance and replacement. These features not only reduce the manufacturing cost of the device, but also significantly improve the efficiency and reliability of the test. First, the base plate of the device serves as the basic support structure, and a placement groove is opened on its top for the stable placement of the salt corrosion box. This design simplifies the installation process of the salt corrosion box. The mounting nuts welded on both sides of the bottom of the base plate are threaded with the lead screw, ensuring the vertical installation accuracy of the lead screw, and also facilitating installation and disassembly, making it convenient to maintain and adjust the device. The design of the lead screw further reflects the flexibility and convenience of the device. The lead screw passes through the top plate, the upper middle plate and the lower middle plate, and achieves height adjustment through multiple nuts, including the upper fixing nut, the lower fixing nut, the upper limit nut, the lower support nut and the lower limit nut. This layered design of the pressure component structure makes the installation and disassembly of each component extremely simple. Furthermore, the jack is placed in the slot between the top plate and the upper middle plate, and the force-measuring ring is placed in the groove between the upper middle plate and the lower middle plate. This design not only ensures the stable installation of the components but also facilitates quick replacement and maintenance. The salt corrosion chamber design also reflects convenience. The internal specimens are stacked, with pads under each layer to ensure that the bottom of each layer of specimens is in contact with the salt corrosion solution. This design not only ensures the stable placement of the specimens but also ensures the consistency of the corrosion effect. The positioning groove on the top of the pressure plate, in conjunction with the adapter, allows the load to be evenly transferred to the specimens, avoiding damage caused by uneven load distribution. In addition, a lifting ring is fixed to the center of the top of the top plate via connecting ribs. This design facilitates the use of lifting equipment to move the entire device to the designated test site, further improving the ease of transport. In summary, the static load and salt corrosion coupling test device of this invention, through its reasonable design and structural layout, achieves advantages such as easy disassembly, convenient assembly, simple structure, low manufacturing cost, and convenient replacement. These designs not only reduce the manufacturing and maintenance costs of the device but also significantly improve the efficiency and reliability of the test. During the experiment, the stability and flexibility of the apparatus ensured the accuracy and repeatability of the experimental data, providing a reliable experimental platform for studying the performance of materials under the coupled effects of static load and salt erosion. This design allows researchers to conduct experiments quickly and efficiently, while also facilitating maintenance and replacement of the apparatus, extending its service life and reducing experimental costs. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 This is a schematic diagram of the base plate structure of the present invention.

[0028] Figure 3 This is a schematic diagram of the pressure component structure of the present invention.

[0029] Figure 4 This is a schematic diagram of the bottom structure of the upper middle plate of the present invention.

[0030] Figure 5 This is a schematic diagram of the top structure of the upper middle plate of the present invention.

[0031] Figure 6 This is a schematic diagram of the lower plate structure of the present invention.

[0032] Figure 7 This is a schematic diagram of the force measuring ring structure of the present invention.

[0033] Figure 8 This is a schematic diagram of the pressure plate structure of the present invention.

[0034] Figure 9 This is a schematic diagram showing the arrangement of specimens inside the salt erosion chamber of the present invention.

[0035] In the diagram: 1. Base plate; 101. Placement slot; 2. Lead screw; 3. Pressure assembly; 4. Top plate; 5. Upper middle plate; 501. Upper groove; 502. Slot; 6. Lower middle plate; 601. Lower groove; 7. Jack; 8. Force measuring ring; 801. Connecting nut; 9. Adapter; 10. Pressure plate; 1001. Positioning slot; 11. Mounting nut; 12. Lower limit nut; 13. Lower support nut; 14. Upper limit nut; 15. Lower fixing nut; 16. Upper fixing nut; 17. Lifting ring; 18. Salt corrosion box; 19. Pad block. Detailed Implementation

[0036] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0037] like Figures 1-9As shown, the static load and salt corrosion coupled test device of the present invention includes a base plate 1, a pressure assembly 3, and a salt corrosion chamber 18. The base plate 1 is the basic support structure of the entire static load and salt corrosion coupled test device. It is rectangular in shape and made of high-strength steel to ensure the stability of the device during the test. The thickness of the base plate 1 should be greater than 50 mm, and the surface is precision machined with a flatness error of no more than 0.05 mm to ensure its accuracy as a support platform. In practical applications, several support columns can be welded to the bottom of the base plate 1 to enhance its structural strength and prevent deformation due to load during the test. The salt corrosion chamber 18 is a key component for containing the corrosion solution and the specimen. It is rectangular in shape, made of corrosion-resistant stainless steel, and should be greater than 5 mm thick. The surface is polished to reduce surface roughness and prevent impurities in the corrosion solution from adhering. The internal dimensions of the salt corrosion chamber 18 are sufficient to accommodate the corrosion solution and the specimen. The salt etching chamber (18) is equipped with a sealing cover on top, which is made of transparent polycarbonate. Two screw rods 2 are vertically installed on the top of the base plate 1. The pressure assembly 3 is adjustablely mounted on the two screw rods 2. The salt etching chamber 18 is placed on top of the base plate 1 and is located directly below the pressure assembly 3. The base plate 1 serves as the basic support structure of the entire device, providing a stable platform to ensure the stability of the device during the test. The screw rods 2 are used to support and adjust the height of the pressure assembly 3, realizing the lifting function of the pressure assembly 3 to adapt to different test requirements. The height adjustment function of the screw rods 2 increases the flexibility and adaptability of the device.

[0038] The pressure assembly 3 includes a top plate 4, an upper middle plate 5, and a lower middle plate 6. These three plates are horizontally adjustable and mounted on two lead screws 2, arranged sequentially from top to bottom. A jack 7 is placed between the top plate 4 and the upper middle plate 5, and a force-measuring ring 8 is placed between the upper middle plate 5 and the lower middle plate 6. An adapter 9 is fixed to the bottom of the lower middle plate 6. The top plate 4, upper middle plate 5, and lower middle plate 6 are mounted sequentially on the lead screws 2, and their height is adjusted by nuts to accommodate different testing requirements. The jack 7, placed between the top plate 4 and the upper middle plate 5, is used to apply static loads; the force-measuring ring 8, placed between the upper middle plate 5 and the lower middle plate 6, is used to measure the applied load; and the adapter 9, fixed to the bottom of the lower middle plate 6, is used to transmit pressure to the pressure plate 10 on the specimen. This layered design of the pressure assembly 3 allows for more accurate load application and measurement. The combined use of jack 7 and force-measuring ring 8 not only allows for precise control of the applied load but also enables real-time monitoring of load changes, ensuring the accuracy of test data. The design of adapter 9 ensures that the load is evenly transferred to the specimen, avoiding specimen damage or test result deviations caused by uneven load transfer.

[0039] The salt corrosion chamber 18 contains the test specimen. A pressure plate 10 is placed on top of the specimen, directly below the adapter 9. The bottom surface of the pressure plate 10 is specially polished to increase the contact area with the specimen and reduce local stress concentration. The entire device, through the rational design and close coordination of the base plate 1, lead screw 2, mounting nut 11, pressure assembly 3, salt corrosion chamber 18, specimen, pad 19, pressure plate 10, force measuring ring 8, jack 7, adapter 9, and lifting ring 17, achieves the coupled testing function of static load and salt corrosion. During the test, the specimen is subjected to both the static load applied by the jack 7 and the corrosive solution environment within the salt corrosion chamber 18, accurately reproducing the actual stress and corrosion state of materials or structures under the combined action of static load and salt corrosion in actual engineering projects. This simulation of coupling effects compensates for the inability of single static load or salt corrosion tests to reveal coupling effects, providing an important experimental platform for studying failure mechanisms under complex environments. It makes the test results more representative and reliable, and can provide more accurate basis for material selection and structural design in practical engineering. Furthermore, the rational installation and coordination between the various structures of the device ensures stable operation during the test, avoiding test errors caused by structural loosening or improper coordination. This overall coordination method not only improves the repeatability and comparability of the tests, but also facilitates the maintenance and adjustment of the device, extends its service life, and reduces maintenance costs.

[0040] In an optional embodiment of this invention, mounting nuts 11 are welded and fixed to both sides of the bottom of the base plate 1. The threaded surfaces of the mounting nuts 11 are hardened to enhance their wear resistance and corrosion resistance, thereby extending the service life of the device. Two lead screws 2 penetrate the base plate 1 and are threadedly engaged with the two mounting nuts 11 respectively. The mounting nuts 11 are used to fix the lead screws 2, ensuring a firm connection between the lead screws 2 and the base plate 1, preventing loosening during the test. The use of mounting nuts 11 ensures the reliable fixing of the lead screws 2, improving the safety and accuracy of the test. The base plate 1 and the lead screws 2 are tightly connected by the threaded engagement of the mounting nuts 11. This connection method not only ensures the vertical installation accuracy of the lead screws 2 but also facilitates installation and disassembly, making it convenient for maintenance and adjustment of the device.

[0041] In one optional embodiment of this example, both lead screws 2 pass through the top plate 4, the upper middle plate 5, and the lower middle plate 6. From top to bottom, each lead screw 2 is sequentially threaded with an upper fixing nut 16, a lower fixing nut 15, an upper limit nut 14, a lower support nut 13, and a lower limit nut 12. A washer is provided between the upper fixing nut 16 and the top plate 4 to increase the contact area with the top plate 4, reduce local stress on the top plate 4, prevent deformation of the top plate 4, and ensure the stability of the top plate 4. In practical applications, a buffer spring can be provided between the upper middle plate 5 and the lower support nut 13 to reduce the impact on the upper middle plate 5 when pressure changes occur, protecting the force measuring ring 8 from damage. The top plate 4 is located between the upper fixing nut 16 and the lower fixing nut 15, and its height is fixed by the upper fixing nut 16 and the lower fixing nut 15. The upper middle plate 5 is located between the upper limit nut 14 and the lower support nut 13, and its height is fixed by the upper limit nut 14 and the lower support nut 13. The lower middle plate 6 is supported on the two lower limit nuts 12. The top plate 4, upper middle plate 5, and lower middle plate 6 are height-adjustable via a lead screw 2 and a nut. This arrangement makes the overall structure of the pressure assembly 3 compact and flexible. The relative positions of the plates can be precisely adjusted using the nuts, ensuring accurate installation of the jack 7, force-measuring ring 8, and adapter 9, thereby improving the overall efficiency and reliability of the pressure assembly 3. Simultaneously, this layered structure facilitates individual maintenance and replacement of each component, reducing the maintenance cost of the device.

[0042] In an optional embodiment of this example, the test specimens in the salt corrosion chamber 18 are stacked, with several pads 19 placed under each layer of test specimens. The surface of the pads 19 is coated with an anti-corrosion coating to prevent corrosion of the pads 19 in the salt corrosion environment, thereby ensuring stable placement of the specimens and consistency of the corrosion effect. The salt corrosion chamber 18 is used to contain the corrosion solution and the specimens, providing a salt corrosion environment for the specimens. The specimens are the objects of the test, used to study performance changes under the coupled effects of static load and salt corrosion. The pads 19 are placed under each layer of specimens to ensure stable placement of the specimens and to ensure that the specimens can be completely immersed in the corrosion solution. The pressure plate 10 is placed on the top layer of specimens to uniformly transfer the load applied by the pressure assembly 3 to the specimens. The design of the salt corrosion chamber 18 can simulate the salt corrosion environment in actual engineering, providing stable corrosion conditions for the specimens. The use of pads 19 ensures the stability and uniformity of the specimens in the corrosion solution, improving the reliability of the test. The design of the pressure plate 10 ensures that the load can be applied evenly to the specimen, avoiding local damage to the specimen caused by load concentration, and making the test results more representative.

[0043] In an optional embodiment of this invention, the base plate 1 has a placement groove 101 for placing the salt etching chamber 18. The cross-sectional size of the placement groove 101 is adapted to the cross-sectional size of the salt etching chamber 18. In practical applications, the depth of the placement groove 101 should be greater than 100 mm, and a protective rubber pad with a thickness of at least 10 mm is provided inside. This rubber pad has good anti-slip and shock absorption properties, which can effectively prevent the salt etching chamber 18 from sliding during the test and can absorb some of the vibration generated by the test, protecting the salt etching chamber 18 from damage. The salt etching chamber 18 is placed in the placement groove 101 of the base plate 1. This design not only ensures the stable placement of the salt etching chamber 18, but also improves the overall stability of the device.

[0044] In an optional embodiment of this invention, connecting nuts 801 are installed at both the upper and lower ends of the force-measuring ring 8. An upper groove 501 is formed at the bottom of the upper middle plate 5, and a lower groove 601 is formed at the top of the lower middle plate 6. The connecting nuts 801 at both ends of the force-measuring ring 8 are adapted to and aligned with the upper groove 501 and the lower groove 601, respectively. The force-measuring ring 8 is used to measure the magnitude of the load applied to the specimen, ensuring precise load control during the test. The connecting nuts 801 at both ends of the force-measuring ring 8 cooperate with the upper groove 501 of the upper middle plate 5 and the lower groove 601 of the lower middle plate 6 to fix the force-measuring ring 8, ensuring its stability during the test. The force-measuring ring 8, through the connecting nuts 801 and the grooves of the upper middle plate 5 and the lower middle plate 6, ensures that the position of the force-measuring ring 8 in the pressure assembly 3 is fixed and stable, avoiding measurement errors caused by loosening of the force-measuring ring 8. Simultaneously, this cooperation method also facilitates the calibration and maintenance of the force-measuring ring 8, ensuring its long-term stable operation and improving the reliability and repeatability of the test.

[0045] In one optional embodiment of this invention, a slot 502 is provided at the center of the top of the upper plate 5. The jack 7 is placed vertically within the slot 502 on the top of the upper plate 5. In practical applications, the inner wall of the slot 502 is provided with anti-slip texture to increase the friction with the jack 7 and ensure the stability of the jack 7 when pressure is applied. The jack 7 is used to apply static load and is a key component for applying load in the test. The slot 502 on the top of the upper plate 5 is used to fix the jack 7, ensuring its stable placement and vertical installation during the test. The jack 7 is placed within the slot 502, and this fit ensures that the position of the jack 7 in the pressure assembly 3 is fixed and stable, avoiding inaccurate load application due to the jack 7 becoming loose. At the same time, this fit also facilitates the installation and removal of the jack 7, improving the efficiency and flexibility of the test.

[0046] In one optional embodiment of this invention, a positioning groove 1001 is provided at the center of the top of the pressure plate 10. The positioning groove 1001 is vertically aligned with the adapter 9, and the cross-sectional size of the positioning groove 1001 is adapted to the lower cross-sectional size of the adapter 9. The adapter 9 is fixed to the bottom of the lower middle plate 6 and is used to transfer the load applied by the pressure assembly 3 to the pressure plate 10 on the specimen. The positioning groove 1001 on the top of the pressure plate 10 is used to align vertically with the adapter 9 to ensure that the load can be evenly transferred to the specimen. The cooperation between the adapter 9 and the positioning groove 1001 allows the load to be accurately transferred to the specimen, avoiding local damage to the specimen caused by uneven load transfer. This cooperation method not only improves the accuracy of the test but also increases the repeatability and comparability of the test. At the same time, this design also facilitates the replacement and adjustment of the specimen, improving the flexibility and efficiency of the test.

[0047] In one optional embodiment of this invention, a connecting rib is horizontally welded to the top plate 4, and a lifting ring 17 is fixed to the center of the top of the top plate 4 via the connecting rib. The lifting ring 17 is fixed to the top of the top plate 4 and is used to connect a lifting hook, facilitating the movement of the entire device to a suitable test site.

[0048] In use, firstly, use a lifting hook to connect the lifting ring 17, and use the lifting ring 17 to move the entire device to a suitable test site. Place the salt etching chamber 18 in the placement groove 101 of the base plate 1, ensuring its stable placement. Secure the lead screw 2 with the mounting nut 11, ensuring a firm connection between the lead screw 2 and the base plate 1. Place the specimen in the salt etching chamber 18, and place pads 19 under each layer of specimens to ensure stable placement. Place the pressure plate 10 on the top layer of specimens, ensuring that the positioning groove 1001 of the pressure plate 10 is aligned vertically with the adapter 9, and that the cross-sectional size of the positioning groove 1001 matches the lower cross-sectional size of the adapter 9. By using a lifting hook to connect the lifting ring 17 to move the entire device to a suitable test site, the overall movement of the device is achieved using the lifting ring 17, which not only saves manpower and time but also improves the efficiency of the test. The salt etching chamber 18 is placed in the placement groove 101 of the base plate 1, ensuring its stable placement. This design prevents the salt etching chamber 18 from shifting due to external forces during the test, thus ensuring the accuracy of the test. Next, the lead screw 2 is tightened using the mounting nut 11 to ensure a firm connection between the lead screw 2 and the base plate 1. This further improves the stability of the device and avoids changes in the position of the pressure component 3 due to loosening of the lead screw 2, which would affect the test results. Specimens are placed in the salt etching chamber 18, with pads 19 placed under each layer of specimens. The use of pads 19 ensures the stable placement of the specimens in the salt etching chamber 18, preventing displacement of the specimens due to the flow of the etching solution during the test, while ensuring that the specimens are completely immersed in the etching solution, thus improving the reliability of the test. Place the pressure plate 10 on the topmost specimen, ensuring that the positioning groove 1001 of the pressure plate 10 is aligned vertically with the adapter 9, and that the cross-sectional size of the positioning groove 1001 matches the lower cross-sectional size of the adapter 9. This alignment ensures that the load can be evenly transferred to the specimen, avoiding specimen damage or test result deviation caused by uneven load transfer, and improving the accuracy of the test. Then, pour the etching solution into the salt etching chamber 18, ensuring that the etching solution covers half of the pressure plate 10, so that the specimen can be subjected to appropriate salt etching. Tighten the lower limit nut 12, lower support nut 13, and lower fixing nut 15 downwards until the adapter 9 naturally contacts the positioning groove 1001 of the pressure plate 10, ensuring stable contact between the adapter 9 and the pressure plate 10. Place the force measuring ring 8 between the upper middle plate 5 and the lower middle plate 6, and ensure that the connecting nuts 801 at the upper and lower ends of the force measuring ring 8 correspond to the upper groove 501 and the lower groove 601, respectively, ensuring stable installation of the force measuring ring 8. Pour the etching solution into the salt etching chamber 18 until it covers half of the pressure plate 10. This operation ensures that the specimen is subjected to appropriate salt etching, avoiding unsatisfactory test conditions due to too much or too little etching solution, thereby improving the accuracy of the test.Tighten the lower limit nut 12, lower support nut 13, and lower fixing nut 15 downwards respectively until the adapter 9 naturally contacts the positioning groove 1001 of the pressure plate 10, ensuring stable contact between the adapter 9 and the pressure plate 10. This avoids inaccurate load transfer due to poor contact and improves the reliability of the test. Place the force measuring ring 8 between the upper middle plate 5 and the lower middle plate 6, and ensure that the connecting nuts 801 at the upper and lower ends of the force measuring ring 8 correspond to the upper groove 501 and the lower groove 601 respectively, ensuring stable installation of the force measuring ring 8. The cooperation between the connecting nuts 801 and the upper groove 501 and lower groove 601 ensures the stability of the force measuring ring 8 during the test, avoiding measurement errors caused by loosening of the force measuring ring 8 and improving the accuracy of the test data. Finally, tighten the upper limit nut 14 and the upper fixing nut 16 upwards respectively to adjust the height of the upper middle plate 5 and the top plate 4, providing suitable space for the installation and operation of the jack 7. Place the jack 7 below the top plate 4, that is, in the slot 502 at the top of the upper middle plate 5, to ensure the vertical placement and stable installation of the jack 7. Tighten the upper limit nut 14 and the upper fixing nut 16 downwards respectively, so that the upper limit nut 14 is in contact with the upper middle plate 5 and the upper fixing nut 16 is in contact with the top plate 4, to complete the height adjustment and fixation of the pressure component 3. Zero the value of the force measuring ring 8, and use the jack 7 to apply pressure until the force measuring ring 8 displays the value corresponding to the expected load, to complete the test loading, and start the static load and salt corrosion coupling test. Tighten the upper limit nut 14 and the upper fixing nut 16 upwards respectively to adjust the height of the upper middle plate 5 and the top plate 4, providing suitable space for the installation and operation of the jack 7. This adjustment facilitates the installation and operation of the jack 7, ensuring that it can be installed smoothly and work normally, thus improving the flexibility and efficiency of the test. Place the jack 7 below the top plate 4, i.e., in the slot 502 at the top of the upper middle plate 5, ensuring the vertical placement and stable installation of the jack 7. This avoids inaccurate load application due to tilting or loosening of the jack 7, improving the accuracy of the test. Tighten the upper limit nut 14 and the upper fixing nut 16 downwards respectively, so that the upper limit nut 14 is in contact with the upper middle plate 5 and the upper fixing nut 16 is in contact with the top plate 4, completing the height adjustment and fixation of the pressure assembly 3. The adjustment of the upper limit nut 14 and the upper fixing nut 16 ensures the overall structural stability of the pressure assembly 3, avoiding test errors caused by structural loosening, and improving the reliability of the test. Zero the value of the force ring 8, apply pressure using jack 7 until the force ring 8 displays the value corresponding to the expected load, complete the test loading, and begin the static load and salt erosion coupling test. Zeroing the value of the force ring 8 ensures the accuracy of the initial state at the start of the test, avoiding test data deviations caused by inaccurate initial values ​​and improving the accuracy of the test data. Applying pressure to the expected load using jack 7, through real-time monitoring by the force ring 8, ensures that the applied load reaches the expected value, improving the accuracy and repeatability of the test, and making the test results more representative and scientific.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A static load and salt erosion coupled test device, comprising a base plate (1), a pressure assembly (3), and a salt erosion chamber (18), characterized in that: Two lead screws (2) are vertically installed on the top of the base plate (1), and the pressure assembly (3) is adjustablely installed on the two lead screws (2). The salt erosion box (18) is placed on the top of the base plate (1) and is located directly below the pressure assembly (3). The pressure assembly (3) includes a top plate (4), an upper middle plate (5) and a lower middle plate (6). The top plate (4), the upper middle plate (5) and the lower middle plate (6) are horizontally adjustable and mounted on two lead screws (2) from top to bottom. A jack (7) is placed between the top plate (4) and the upper middle plate (5). A force measuring ring (8) is placed between the upper middle plate (5) and the lower middle plate (6). An adapter (9) is fixed at the bottom of the lower middle plate (6). The salt erosion chamber (18) contains a test specimen for testing, with a pressure plate (10) placed on top of the specimen, and the pressure plate (10) is located directly below the adapter (9).

2. The static load and salt erosion coupled test device according to claim 1, characterized in that: The bottom of the base plate (1) is welded and fixed with mounting nuts (11) on both sides. The two lead screws (2) pass through the base plate (1) and are threadedly engaged with the two mounting nuts (11) respectively.

3. The static load and salt erosion coupled test device according to claim 1, characterized in that: Both lead screws (2) pass through the top plate (4), the upper middle plate (5) and the lower middle plate (6). The two lead screws (2) are threaded together from top to bottom with an upper fixing nut (16), a lower fixing nut (15), an upper limit nut (14), a lower support nut (13) and a lower limit nut (12). The top plate (4) is located between the upper fixing nut (16) and the lower fixing nut (15), and the height of the top plate (4) is fixed by the upper fixing nut (16) and the lower fixing nut (15). The upper middle plate (5) is located between the upper limit nut (14) and the lower support nut (13), and the height of the upper middle plate (5) is fixed by the upper limit nut (14) and the lower support nut (13). The lower middle plate (6) is supported on the two lower limit nuts (12).

4. The static load and salt erosion coupled test device according to claim 1, characterized in that: The test specimens in the salt erosion chamber (18) are stacked, and several pads (19) are placed under each layer of test specimens.

5. The static load and salt erosion coupled test device according to claim 1, characterized in that: The base plate (1) has a placement groove (101) for placing the salt erosion box (18), and the cross-sectional size of the placement groove (101) is adapted to the cross-sectional size of the salt erosion box (18).

6. The static load and salt erosion coupled test apparatus according to claim 1, characterized in that: The force measuring ring (8) is equipped with connecting nuts (801) at both the upper and lower ends. The bottom of the upper middle plate (5) is provided with an upper groove (501), and the top of the lower middle plate (6) is provided with a lower groove (601). The connecting nuts (801) at the upper and lower ends of the force measuring ring (8) are adapted to and aligned with the upper groove (501) and the lower groove (601) respectively.

7. The static load and salt erosion coupled test device according to claim 1, characterized in that: A slot (502) is provided at the top center of the upper middle plate (5), and the jack (7) is placed vertically in the slot (502) at the top of the upper middle plate (5).

8. The static load and salt erosion coupled test device according to claim 1, characterized in that: The pressure plate (10) has a positioning groove (1001) at the top center. The positioning groove (1001) is aligned with the adapter (9) vertically. The cross-sectional size of the positioning groove (1001) is adapted to the cross-sectional size of the lower part of the adapter (9).

9. The static load and salt erosion coupled test device according to claim 1, characterized in that: The top plate (4) is horizontally welded with connecting ribs, and a lifting ring (17) is fixed at the top center of the top plate (4) through the connecting ribs.

10. A static load and salt erosion coupled test apparatus according to claims 1-9, characterized in that: The specific usage method of this static load and salt erosion coupled test device includes the following steps: Step 1: Use a lifting hook to connect the lifting ring (17), and use the lifting ring (17) to move the entire device to a suitable test site. Place the salt corrosion box (18) in the placement groove (101) of the base plate (1) to ensure that it is placed stably. Use the mounting nut (11) to fix the screw (2) tightly to ensure that the screw (2) is firmly connected to the base plate (1). Place the specimen in the salt corrosion box (18) and place a pad (19) under each layer of specimen to ensure the stable placement of the specimen. Place the pressure plate (10) on the top layer of specimen, and ensure that the positioning groove (1001) of the pressure plate (10) is aligned with the adapter (9) vertically, and that the cross-sectional size of the positioning groove (1001) is compatible with the cross-sectional size of the lower part of the adapter (9). Step 2: Pour the etching solution into the salt etching chamber (18) until it covers half of the pressure plate (10) to ensure that the specimen is subjected to appropriate salt etching. Tighten the lower limit nut (12), lower support nut (13), and lower fixing nut (15) downwards until the adapter (9) naturally contacts the positioning groove (1001) of the pressure plate (10) to ensure stable contact between the adapter (9) and the pressure plate (10). Place the force ring (8) between the upper middle plate (5) and the lower middle plate (6) and make the connecting nuts (801) at the upper and lower ends of the force ring (8) correspond to the upper groove (501) and the lower groove (601) respectively to ensure stable installation of the force ring (8). Step 3: Tighten the upper limit nut (14) and the upper fixing nut (16) upwards respectively to adjust the height of the upper middle plate (5) and the top plate (4) to provide suitable space for the installation and operation of the jack (7). Place the jack (7) below the top plate (4), that is, in the slot (502) at the top of the upper middle plate (5) to ensure the vertical placement and stable installation of the jack (7). Tighten the upper limit nut (14) and the upper fixing nut (16) downwards respectively to make the upper limit nut (14) fit with the upper middle plate (5) and make the upper fixing nut (16) contact the top plate (4) to complete the height adjustment and fixation of the pressure component (3). Zero the value of the force measuring ring (8) and use the jack (7) to apply pressure until the force measuring ring (8) displays the value corresponding to the expected load. The test loading is completed, and the static load and salt corrosion coupling test begins.

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