Stress corrosion device and method of using the same

Abstract

The present disclosure provides a stress corrosion device and a method for using the same, relating to the field of stress corrosion technology. The stress corrosion device includes a housing, multiple ropes, a salt spray generating mechanism, and a stress applying mechanism. The inner wall of the housing forms a housing; the multiple ropes are disposed within the housing space, and the multiple ropes can be connected end-to-end with multiple test specimens to form a test rope; the salt spray generating mechanism is disposed within the housing space to create a salt spray environment within the housing space; the stress applying mechanism is connected to the first end of the test rope; and the second end of the test rope is fixedly connected to the inner wall of the housing. The present disclosure allows for assessing the corrosion resistance of multiple test specimens while applying equal stress to them.

Description

Technical Field

[0001] The present disclosure relates to the field of stress corrosion technology, and in particular to a stress corrosion device and a method of using the same. Background Art

[0002] Existing indoor accelerated corrosion tests are mostly conducted through salt spray test chambers, which create an artificially simulated salt spray environment to assess the corrosion resistance of materials or products.

[0003] When conducting a salt spray test, you first need to place the test sample in the test chamber. Then, adjust the temperature and humidity in the test chamber to the set values, and add an appropriate amount of sodium chloride solution to the sprayer. After starting the test chamber for a period of time, check the condition of the sample surface, record the inspection results, clean the sample surface, evaluate the test results, and finally complete the test report.

[0004] However, during the salt spray test, the specimens in the salt spray test chamber are in a zero stress state, which is inconsistent with the actual engineering situation. In the existing stress test, the stress of each specimen is generally applied separately through a jack and a reaction frame, which is not convenient for applying stress to a large number of specimens at the same time. Summary of the Invention

[0005] A technical problem to be solved by the present disclosure is: how to evaluate the corrosion resistance of multiple specimens while applying equal stress to them.

[0006] To solve the above technical problems, the present disclosure provides a stress corrosion device, comprising:

[0007] The box body, wherein the inner wall of the box body forms an accommodating space;

[0008] Multiple rope bodies are arranged in the accommodating space, and the multiple rope bodies can be connected end to end with multiple specimens to form a test rope;

[0009] A salt mist generating mechanism is provided in the accommodating space and is used to form a salt mist environment in the accommodating space;

[0010] a stress applying mechanism connected to the first end of the test rope;

[0011] The second end of the test rope is fixedly connected to the inner wall of the box.

[0012] In some embodiments, a plurality of first steering mechanisms are provided on the inner wall of the box, and the test rope is connected to the stress applying mechanism after being redirected by the plurality of first steering mechanisms.

[0013] In some embodiments, multiple first steering mechanisms are evenly arranged on the first side and the second side of the box, the first side and the second side are opposite sides, and the test rope is alternately wound around the first steering mechanisms on the first side and the second side.

[0014] In some embodiments, the housing comprises:

[0015] Frame structure, the frame structure is surrounded by multiple outer frame beams and columns;

[0016] Mist shields are installed on multiple sides of the frame structure and are connected to multiple outer frame beams and columns;

[0017] The balance beam has two ends connected to the columns arranged on the first side and the second side respectively.

[0018] In some embodiments, the stress applying mechanism includes a connecting rope and a counterweight, one end of the connecting rope is connected to the first end of the test rope, and the other end of the connecting rope is connected to the counterweight, and the counterweight is in a suspended state.

[0019] In some embodiments, the stress applying mechanism further comprises a lever arm and a fixed pulley, wherein the fixed pulley is disposed at one end of the lever arm;

[0020] The fixed pulley includes a rotating shaft, a bearing, and a rotating wheel. Both ends of the rotating shaft are fixedly connected to the support frame. The rotating shaft is set at the center of the rotating shaft. The bearing is set between the rotating shaft and the rotating wheel. One end of the test rope is connected to the outer periphery of the rotating wheel, and one end of the connecting rope is connected to the other end of the force arm rod.

[0021] In some embodiments, the lever arm is fixedly connected to the second side of the box body, and a second steering mechanism is provided at the top of the first side of the box body. The connecting rope passes through the fixed pulley provided at the bottom end of the lever arm, the top end of the lever arm and the second steering mechanism in sequence and is connected to the counterweight block.

[0022] In some embodiments, further comprising:

[0023] A tightener, which is arranged on the inner wall of the box and connected to the second end of the test rope;

[0024] Anti-slip rope, one end of which is fixedly connected to the box body, and the other end of which can be connected to the specimen.

[0025] In some embodiments, the tightener includes a screw and an adjusting nut, one end of the screw is connected to the second end of the test rope, and the second end of the screw passes through the inner wall of the box and is threadedly connected to the adjusting nut.

[0026] A method for using the above-mentioned stress corrosion device comprises the following steps:

[0027] The stress applying mechanism applies a set stress to the test rope;

[0028] Turn on the salt mist generating mechanism to form a salt mist environment in the accommodating space;

[0029] After each set corrosion cycle, some samples are taken out and the samples in the original series connection are replaced with ropes of equal length until all samples are taken out.

[0030] Through the above technical solution, the stress corrosion device provided by the present disclosure forms a test rope by connecting multiple rope bodies and test specimens end to end, connects a stress applying mechanism to the first end of the test rope, and fixes the second end of the test rope to the inner wall of the box, so that the stress applying mechanism can apply stress to the test rope, thereby applying equal stress to multiple specimens in the test rope; and forms a salt spray environment in the accommodating space by the salt spray generating mechanism, so that the corrosion resistance of multiple specimens can be evaluated when equal stress is applied to them. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 is a schematic diagram of the internal structure of the stress corrosion device disclosed in the embodiment of the present disclosure;

[0033] Figure 2 is a schematic diagram of the three-dimensional structure of the stress corrosion device disclosed in an embodiment of the present disclosure;

[0034] Figure 3 It is a structural schematic diagram of the stress corrosion device disclosed in an embodiment of the present disclosure before replacing some samples;

[0035] Figure 4 This is a schematic diagram of the structure of the stress corrosion device disclosed in the embodiment of the present disclosure when replacing some samples

[0036] Figure 5 It is a schematic structural diagram of the stress corrosion device disclosed in the embodiment of the present disclosure after some samples are replaced;

[0037] Figure 6 It is a structural schematic diagram of the tightening device of the stress corrosion device disclosed in the embodiment of the present disclosure.

[0038] Description of reference numerals:

[0039] 1. Box body; 11. Frame structure; 111. Outer frame beam; 112. Column; 12. Mist shield; 15. Balance beam; 2. Test rope; 21. Rope body; 22. Test specimen; 3. Salt spray generating mechanism; 4. Stress applying mechanism; 41. Connecting rope; 42. Counterweight; 5. First steering mechanism; 6. Lever; 7. Tightener; 71. Screw; 72. Adjusting nut; 73. Outer frame; 74. Outer sleeve; 75. Steering block; 8. Anti-slip rope; 9. Fixed pulley; 10. Protection beam; 13. Second steering mechanism; 14. Jack; 16. Moving step ladder; 17. Support frame; R, length of lever; r, outer diameter of fixed pulley. DETAILED DESCRIPTION

[0040] The following embodiments of the present disclosure are further described in detail with reference to the accompanying drawings and examples. The detailed description of the following examples and the accompanying drawings are intended to illustrate the principles of the present disclosure, but are not intended to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but rather includes all technical solutions within the scope of the claims.

[0041] The present disclosure provides these embodiments in order to make this disclosure thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values ​​set forth in these embodiments should be interpreted as merely exemplary, and not as limiting.

[0042] It should be noted that, in the description of this disclosure, unless otherwise specified, "plurality" means greater than or equal to two; terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are intended solely to facilitate and simplify the description of this disclosure, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0043] In addition, the terms "first," "second," and similar terms used in this disclosure do not denote any order, quantity, or importance, but are merely used to distinguish different parts. "Perpendicular" does not mean perpendicular in the strict sense, but rather means within the tolerance range. "Parallel" does not mean parallel in the strict sense, but rather means within the tolerance range. "Include" or "comprising" and similar terms mean that the elements preceding the term include the elements listed after the term, and do not exclude the possibility of also including other elements.

[0044] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this disclosure depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intervening device between the specific device and the first or second device.

[0045] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined as such herein.

[0046] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0047] Existing indoor accelerated corrosion tests are mostly conducted through salt spray test chambers, which create an artificially simulated salt spray environment to assess the corrosion resistance of materials or products.

[0048] When conducting a salt spray test, you first need to place the test sample in the test chamber. Then, adjust the temperature and humidity in the test chamber to the set values, and add an appropriate amount of sodium chloride solution to the sprayer. After starting the test chamber for a period of time, check the condition of the sample surface, record the inspection results, clean the sample surface, evaluate the test results, and finally complete the test report.

[0049] However, during the salt spray test, the specimens in the salt spray test chamber are in a zero stress state, which is inconsistent with the actual engineering situation. In the existing stress test, the stress of each specimen is generally applied separately by a jack in combination with a reaction frame. The space in the salt spray test chamber is limited, which makes it inconvenient to apply stress to a large number of specimens at the same time.

[0050] In order to solve the above technical problems, the present disclosure proposes a stress corrosion device and a method of using the same, which can evaluate the corrosion resistance of multiple samples when equal stress is applied to them.

[0051] Example 1

[0052] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5and Figure 6 As shown, a stress corrosion device includes a box 1, multiple ropes 21, a salt spray generating mechanism 3 and a stress applying mechanism 4. The inner wall of the box 1 forms an accommodating space; the multiple ropes 21 are arranged in the accommodating space, and the multiple ropes 21 can be connected end to end with multiple specimens 22 to form a test rope 2; the salt spray generating mechanism 3 is arranged in the accommodating space, and is used to form a salt spray environment in the accommodating space; the stress applying mechanism 4 is connected to the first end of the test rope 2; wherein the second end of the test rope 2 is fixedly connected to the inner wall of the box 1.

[0053] The box body 1 refers to a closed or semi-closed external structure used to surround, support and protect its internal components. The box body 1 can be a simple container shape or a complex structural design. Specifically, the box body 1 can be a square structure or a cylindrical structure surrounded by multiple fog shields 12, thereby isolating the external environment and protecting the internal components from physical damage or harmful environmental factors; the box body 1 can also be composed of a square frame structure 11 and fog shields 12, the square frame is fixedly connected by outer frame beams 111, and the fog shields 12 are installed between the outer frame beams 111 to isolate the external environment. More specifically, the box body 1 can be provided with openings such as doors, covers or windows, and these openings can be equipped with seals to ensure the airtightness of the box body 1. For large boxes 1, additional support structures can be provided to maintain their shape and stability. For example, support beams can be provided at the four corners of the box body 1 to strengthen the rigidity of the box body 1. In order to improve corrosion resistance, rust resistance or reduce friction, the surface of the box body 1 may also be specially treated or coated. For example, corrosion-resistant material may be provided on the inner side of the mist shield 12 to prevent the mist shield 12 from being corroded by salt spray.

[0054] The rope body 21 is a long strip of fiber material made by twisting or braiding two or more strands of fiber material in a certain manner (such as twisting or braiding). It has high tensile strength and good flexibility, and can maintain a stable shape while withstanding large tensile forces. Specifically, the rope body 21 can be a synthetic fiber rope, including polypropylene, nylon, polyester, polyethylene, rayon, etc. Synthetic fiber ropes are stronger and more durable than natural fiber ropes, and have better corrosion resistance and weather resistance. The rope body 21 can also be a metal wire rope, such as a steel wire rope, which is made of multiple layers of steel wire twisted according to certain rules and has extremely high strength and wear resistance. To improve the corrosion resistance of the steel wire rope, the surface of the steel wire rope can be galvanized, aluminum-plated, or galvanized aluminum alloy-plated. The surface of the steel wire rope can also be sprayed or brushed with anti-corrosion paint to form a protective film to isolate the corrosive medium. The steel wire rope can also be wrapped with plastic materials such as polyethylene and polyvinyl chloride to form a dense protective layer to effectively prevent the intrusion of moisture and corrosive substances. The steel wire rope can also be made of stainless steel, which has excellent corrosion resistance and is suitable for extreme corrosive environments.

[0055] The connection between the cable 21 and the specimen 22 must ensure that the specimen 22 can stably withstand the load during stress application and that test results are not affected by improper connection in a corrosive environment. Specifically, the cable 21 can be directly tied to the ends of the specimen 22, eliminating the need for additional connection tools or equipment and resulting in low cost. Alternatively, a clamp can be used to secure the cable 21 and specimen 22 together to ensure a secure connection. During use, one end of the specimen 22 can be inserted into the clamp, ensuring that the contact surface between the specimen 22 and the clamp is flat and free of gaps. The other end of the cable 21 can then be secured to the other side of the clamp to ensure a secure connection. Alternatively, a threaded connection can be used to ensure a secure connection between the cable 21 and specimen 22, facilitating removal and replacement of the specimen 22. During use, a threaded hole can be machined into one end of the specimen 22, or a connector with a threaded hole can be used to secure the specimen 22. Then, one end of the cable 21 can be secured to the screw 71 to ensure a secure connection. Finally, the nut can be tightened to ensure a secure connection between the cable 21 and specimen 22. The rope body 21 and the sample 22 can also be permanently connected together by welding, and the connection strength is very high. The rope body 21 and the sample 22 can also be crimped together by a crimping tool, and the connection is reliable.

[0056] The salt spray generating mechanism 3 is a device used to simulate a salt spray corrosion environment to test the corrosion resistance of materials or products. Specifically, the salt spray generating mechanism 3 includes a sprayer and a salt solution supply system. The sprayer includes a nozzle and a compressed air system: the nozzle is used to spray the salt solution to form fine droplets, and the compressed air system provides high-pressure air to atomize the salt solution through the nozzle. Specifically, the sprayer can be set at the top, side wall or bottom of the box 1, with the nozzle facing the interior of the box 1 or the central area of ​​the box 1 to facilitate the droplets to be quickly filled with salt spray. The salt solution supply system includes a liquid storage tank, a pump and a filter. The liquid storage tank is used to store the salt solution. The pump is set in the liquid storage tank and transports the salt solution from the liquid storage tank to the nozzle. The filter is set on the connecting pipe between the pump and the nozzle, which can filter the salt solution, remove impurities, and prevent clogging of the nozzle. More specifically, the liquid storage tank can be set inside the box 1 or outside the box 1 and connected to the sprayer via a pipe. More specifically, the salt mist generating mechanism 3 may further include a salt mist collector disposed at the bottom of the housing 1 for collecting the falling salt mist to facilitate subsequent analysis of the salt mist composition. The specific structure of the salt mist generating mechanism 3 is not limited as long as the salt mist generating mechanism 3 can simulate a salt mist corrosion environment.

[0057] The stress-applying mechanism 4 is a device capable of applying a predetermined mechanical stress to the specimen 22. Specifically, the stress-applying mechanism 4 can be a device for performing static tensile tests on materials or components, evaluating the mechanical properties of the material by applying a constant tensile load. More specifically, the stress-applying mechanism 4 can be a manual tensile testing machine that applies the load manually through a handwheel or lever, resulting in a simple structure and low cost. Alternatively, it can be an electronic universal testing machine driven by an electric motor that applies the load through a transmission mechanism such as a lead screw or ball screw. Equipped with high-precision force sensors and displacement sensors, it can accurately measure load and displacement. Computer software can be used to control the loading process and record and analyze test data. Alternatively, the stress-applying mechanism 4 can be a hydraulic tensile testing machine that uses a hydraulic cylinder to apply the load. This machine is capable of applying very large loads and is suitable for testing high-strength materials. The hydraulic system provides a stable loading force, making it suitable for long-term testing. More specifically, the stress-applying mechanism 4 can be a counterweight 42 that is suspended in the air and applies a stable load to the specimen 22. This is low cost and suitable for applying a stable load for a long time. As long as the stress applying mechanism 4 can apply a predetermined mechanical stress to the sample 22 , the specific structure and type of the stress applying mechanism 4 are not limited.

[0058] Through the above technical solution, the stress corrosion device provided by the present disclosure forms a test rope 2 by connecting multiple rope bodies 21 and test specimens 22 end to end, connects a stress applying mechanism 4 to the first end of the test rope 2, and fixes the second end of the test rope 2 to the inner wall of the box 1, so that the stress applying mechanism 4 can apply stress to the test rope 2, and then apply equal stress to multiple test specimens 22 in the test rope 2; a salt mist generating mechanism 3 is also used to form a salt mist environment in the accommodating space, so that the corrosion resistance of multiple test specimens 22 is evaluated when equal stress is applied to them; different stresses can also be applied by the stress applying mechanism, so that multiple stress levels, multiple corrosion cycles, and test specimens can be tested simultaneously in the same corrosion environment.

[0059] In some embodiments, a plurality of first steering mechanisms 5 are provided on the inner wall of the box 1, and the test rope 2 is connected to the stress applying mechanism 4 after being redirected by the plurality of first steering mechanisms 5. This arrangement not only increases the length of the test rope 2, but also allows the box 1 to accommodate more specimens 22.

[0060] The first steering mechanism 5 is a device used to change the path of the test rope 2. It can be composed of a series of guide wheels, pulleys, or other similar components. Specifically, the steering mechanism can be a guide ring through which the test rope 2 passes to achieve steering. The steering mechanism can also be a guide wheel, consisting of a central axis and a rotating wheel with a smooth surface to reduce friction. More specifically, the central axis of the guide wheel is fixed to the inner wall of the housing 1 to ensure the guide wheel's stable position. The rotating wheel can be made of a corrosion-resistant material such as metal (such as stainless steel), nylon, or polyurethane, with a smooth surface to reduce friction with the test rope 2. Bearings are located between the central axis and the rotating wheel to ensure free rotation of the wheel. More specifically, the guide wheel can be a fixed pulley, with the test rope 2 positioned in the rope groove of the rotating wheel to ensure the rope's position on the pulley is fixed. More specifically, the first steering mechanism 5 can also be a pulley assembly consisting of multiple pulleys to achieve multi-level steering. The coordinated action of multiple pulleys can achieve complex path changes and increase the effective length of the test rope 2. The first steering mechanism 5 may further include a fixed bracket that can be connected to the central axis of the guide wheel, thereby securing the first steering mechanism 5 to the inner wall of the housing 1. More specifically, a stopper can be provided between the multiple fixed pulleys, and the fixed pulleys can be sealed with a fiber plastic material with no shear stiffness to prevent corrosive gases from penetrating the fixed pulleys and thereby prevent internal rust on the fixed pulleys from increasing the friction of the corrosion device. More specifically, multiple first steering mechanisms 5 can be distributed on adjacent sides of the housing 1, or on opposite sides of the housing 1 to increase the length of the test rope 2.

[0061] like Figure 1 and Figure 2 As shown, in some embodiments, multiple steering mechanisms are evenly arranged on the first side and the second side of the box 1, the first side and the second side are opposite sides, and the test rope 2 is alternately wound around the first steering mechanism 5 on the first side and the second side.

[0062] The test rope 2 is interlaced and wound around the first steering mechanisms 2 on the first and second sides, thereby further increasing the path of the test rope 2 and loading more specimens 22. Specifically, one end of the test rope 2 can be fixed to a fixed point on the box 1. The test rope 2 passes through the first steering mechanism on the first side and changes direction. The test rope 2 passes through the first steering mechanism on the second side and changes direction again. The test rope 2 passes through the steering mechanisms on the first and second sides in sequence to form an interlaced connection. After passing through the last steering mechanism, the test rope 2 is finally connected to the stress applying mechanism 4.

[0063] For example, in a stress corrosion testing device, eight fixed pulleys may be provided on the inner wall of a box 1, with the first fixed pulley, the third fixed pulley, the fifth fixed pulley, and the seventh fixed pulley being evenly spaced apart on the first side of the box 1, and the second fixed pulley, the fourth fixed pulley, the sixth fixed pulley, and the eighth fixed pulley being evenly spaced apart on the second side of the box 1. The test rope 2 is connected as follows: one end of the test rope 2 is fixed to the inner wall of the box 1. The test rope 2 passes through the first fixed pulley and changes direction. The test rope 2 then passes through the second fixed pulley, the third fixed pulley, the fourth fixed pulley, the fifth fixed pulley, the sixth fixed pulley, and the seventh fixed pulley in sequence, further changing direction. The test rope 2 passes through the eighth fixed pulley and finally changes direction.

[0064] More specifically, the first steering mechanisms 5 on the first and second sides can be symmetrically arranged so that the sample 22 is in a parallel position; the first steering mechanisms 5 on the first and second sides can be staggered so that the sample 22 is in an inclined position. The number of the first steering mechanisms 5 on the first and second sides can be the same or different. More specifically, if Figure 2 As shown, multiple first steering mechanisms 5 can also be evenly spaced along the depth direction of the box body 1, that is, multiple first steering mechanisms 5 are spaced in the up, down, left and right directions of the first side of the box body 1, so that multiple rows of test ropes 2 are set in the left and right directions of the first side of the box body 1 to accommodate more specimens 22.

[0065] By evenly arranging multiple first steering mechanisms 5 on the first side and the second side of the box 1 and connecting them in an interlaced manner, the samples 22 between every two first steering mechanisms 5 can be made parallel to each other. For example, the sample 22 between the first steering mechanism 5 and the second steering mechanism is parallel to the sample 22 between the second steering mechanism and the third steering mechanism, that is, the stress application direction of the multiple samples 22 is the same, thereby controlling the test variables and improving the measurement accuracy.

[0066] like Figure 1 and Figure 2As shown, in some embodiments, the box body 1 includes a frame structure 11, a mist shield 12, and a balance beam 15. The frame structure 11 is surrounded by a plurality of outer frame beams 111 and columns 112. The mist shield 12 is installed on multiple sides of the frame structure 11. The mist shield 12 is connected to the plurality of outer frame beams 111 and the columns 112 to block the sides of the frame structure 11 and prevent salt mist from overflowing. The two ends of the balance beam 15 are respectively connected to the columns 112 arranged on the first side and the second side. The frame structure is surrounded by a plurality of outer frame beams to form a solid three-dimensional frame. Specifically, the frame structure 11 can be a rectangular frame, a circular frame, or a frame of other regular shapes. For example, the frame structure 11 can be a square frame structure. The mist shield 12 is installed on the six sides of the square frame to form a closed box body 1. The mist shield 12 adjacent to the first side and the second side is detachably connected to the frame structure 11, thereby facilitating the batch removal of samples.

[0067] Balance beam 15 can be constructed from corrosion-resistant, high-strength materials such as stainless steel or aluminum alloy. It can be configured as a long strip or frame, for example, a square steel tube or I-beam, to ensure sufficient rigidity and stability. Balance beam 15 is securely fastened between the first and second sides of the box 1 to prevent displacement during the test. The presence of balance beam 15 strengthens the box 1 and counteracts the effects of the preload of the test rope 2 on the box 1.

[0068] like Figure 1 and Figure 2 As shown, in some embodiments, the stress-applying mechanism 4 includes a connecting rope 41 and a counterweight 42. One end of the connecting rope 41 is connected to the first end of the test rope 2, and the other end of the connecting rope 41 is connected to the counterweight 42, with the counterweight 42 being suspended. Constant tension is applied by the connecting rope 41 and the counterweight 42, ensuring that the test rope 2 applies uniform stress on the specimen 22. This design is simple and reliable, and is particularly suitable for stress corrosion tests that require a constant load. Compared to a tensile testing machine, a constant load can be applied over a longer period (e.g., one to two years), avoiding instability in the applied load due to a long test period. Specifically, the connecting rope 41 can be made of a corrosion-resistant, high-strength material, and its structure, shape, and composition can also be the same as the rope body 21, such as stainless steel or nylon. More specifically, the length of the connecting rope 41 can be determined based on the test requirements and the size of the box 1. The weight of the counterweight 42 can be selected appropriately based on the test requirements to ensure that the applied tension meets the test standards. The counterweight 42 should be in a suspended state to ensure that the pulling force is constant and is not affected by the ground or other objects.

[0069] like Figure 1 and Figure 2As shown, in some embodiments, the stress applying mechanism 4 further includes a lever arm 6 and a fixed pulley 9, and the fixed pulley 9 is arranged at one end of the lever arm 6; the fixed pulley 9 includes a rotating shaft, a bearing, and a rotating wheel, and both ends of the rotating shaft are fixedly connected to the support frame 17, the rotating shaft is arranged at the center of the rotating shaft, and the bearing is arranged between the rotating shaft and the rotating wheel, one end of the test rope 2 is connected to the outer periphery of the rotating wheel, and one end of the connecting rope 41 is connected to the other end of the lever arm 6.

[0070] Specifically, the lever arm 6 can be made of corrosion-resistant, high-strength materials, such as stainless steel or aluminum alloy. The lever arm 6 can be designed as a long strip to ensure sufficient rigidity and stability. The lever arm 6 is firmly fixed to the side of the box body 1 to ensure that no displacement occurs during the test. More specifically, the fixed frame of the fixed pulley 9 can be welded to the lever arm 6, one end of the test rope 2 is connected to the outer periphery of the rotating wheel, and one end of the connecting rope 41 is connected to the other end of the lever arm 6 to form a laborious lever, such as Figure 1 As shown, the center of the fixed pulley 9 is the fulcrum of the lever. The distance from the top of the lever arm 6 to the center of the fixed pulley 9 is lever arm 1, and the weight of the counterweight 42 is tension 1. The outer diameter r of the fixed pulley 9 is lever arm 2, and the tension of the test rope 2 at the bottom of the counterweight 42 is tension 2. The product of lever arm 1 and tension 1 is equal to the product of lever arm 2 and tension 2. In other words, the multiple of the weight of the counterweight 42 amplified by the device is equal to the ratio β of the length R of the lever arm 6 (the distance from the other end of the lever arm 6 to the center of the fixed pulley 9) to the outer diameter r of the fixed pulley 9 at the bearing position. Amplifying the weight of the counterweight 42 by lever arm 6 can significantly reduce the weight of the counterweight 42, thereby simplifying the design of the test device and improving the convenience of the test.

[0071] More specifically, support frame 17 can be a frame structure, fixedly connected to housing 1. Support rods or support plates can be provided on opposite sides of support frame 17, with the rotating shaft connected to the rods or support plates. If there are multiple test ropes 2, the rotating wheels of multiple fixed pulleys 9 can be connected to the same rotating shaft. More specifically, lever arm 6 is fixedly connected to a bearing or rotating wheel. When the test rope 2 pulls the rotating wheel, lever arm 6 rotates accordingly.

[0072] In some embodiments, the lever arm 6 is fixedly connected to the second side of the housing 1, and a second steering mechanism 13 is provided at the top of the first side of the housing 1. The connecting rope 41 passes through the fixed pulley 9 provided at the bottom end of the lever arm 6, the top end of the lever arm 6, and the second steering mechanism 13, and then connects to the counterweight 42. The second steering mechanism 13 can be the same as the first steering mechanism 5, for example, it can be a guide ring, a guide wheel, etc. The second steering mechanism 13 can also be a continuous guide sleeve to facilitate the simultaneous steering of multiple rows of test ropes 2. The connecting rope 41 passes through the bottom end, the top end, and the second steering mechanism 13 at the top of the first side of the housing 1, and then connects to the counterweight 42. That is, the test specimen 22 is connected to the counterweight 42 after it has passed through the housing 1 once. This not only allows the lever arm 6 to amplify the tension of the counterweight 42, but also allows the height of the housing 1 to keep the counterweight 42 suspended, thereby optimizing the structural space and improving space utilization efficiency.

[0073] In some embodiments, it also includes a tightener 7 and an anti-slip rope 8. The tightener 7 is arranged on the inner wall of the box 1, and the tightener 7 is connected to the second end of the test rope 2; one end of the anti-slip rope 8 is fixedly connected to the box 1, and the other end of the anti-slip rope 8 can be connected to the sample 22.

[0074] The tensioner 7 is a mechanical device used to adjust and maintain the tension of the test rope 2. It includes an adjustable component that allows for manual or automatic adjustment of tension, ensuring that the connector maintains the desired tension during use. Specifically, the tensioner 7 can be a manual tensioner 7. Examples include threaded tensioners 7, handle tensioners 7, and ratchet tensioners 7. Tension is adjusted by rotating a thread. Common forms include a nut and screw 71 combination, allowing the user to adjust the rope tension by rotating the nut. Handle tensioners 7 adjust tension by manually operating a handle. Handle tensioners 7 have a wide adjustment range and are suitable for applications requiring frequent tension adjustments. Ratchet tensioners 7 lock and release tension using a ratchet mechanism. The user adjusts the tension by rotating the handle, which then locks the current position with the ratchet. Automatic tensioners 7 can be spring tensioners 7, which automatically adjust and maintain tension using the elastic force of a spring. When the tension in the connector changes, the spring automatically expands and contracts to maintain a constant tension. The tightener 7 can also be a hydraulic tightener 7: the tension is automatically adjusted and maintained through a hydraulic system. The hydraulic tightener 7 is generally used in situations requiring high precision and high stability. The tightener 7 can also be an electric tightener 7: the tension is automatically adjusted and maintained through an electric motor drive. The electric tightener 7 can be precisely adjusted through a controller and is suitable for applications with a high degree of automation. The tightener 7 can also be a fixed tightener 7, such as a fixed nut tightener 7 and a clamping tightener 7. The fixed nut tightener 7 adjusts and locks the tension through a fixed nut. The user can adjust the tension by rotating the nut, and then tighten the fixed nut to lock the current position. The clamping tightener 7 fixes and adjusts the tension through a clamping mechanism. The clamping tightener 7 usually has a simple structure and is suitable for quickly adjusting and locking the tension.

[0075] The tensioner 7 can be provided to tighten the slack test rope 2 and apply an initial preload, and then apply stress via the counterweight 42, thereby avoiding multiple turns that may cause different stresses at different positions on the test rope 2 and improving the uniformity of the force applied to the specimen 22. Specifically, the counterweight 42 can be supported by the jack 14 or a support block so that the counterweight 42 and the lever arm 6 do not apply tension to the test rope 2. The tensioner 7 can then be used to tighten the slack test rope 2 and apply an initial preload, thereby avoiding the safety hazard of tilting the lever arm 6 due to the slack of the test rope 2.

[0076] like Figure 3 、 Figure 4 and Figure 5As shown, the provision of an anti-drop rope 8 can facilitate the removal or replacement of the sample 22, and prevent part of the test rope 2 and the sample 22 from falling off when the sample 22 is replaced. Specifically, when taking the sample 22, the manual jack 14 can be used to unload the weight of the counterweight 42, and then the anti-drop rope 8 can be hung on the reserved hole at the end of the sample 22. Finally, the tensioner 7 can be loosened to transfer the deadweight of the test rope 2 and the corrosion sample 22 to the inner wall of the box 1 or the outer frame beam 111 through the anti-drop rope 8. A steel wire rope of equal length is used to replace the original series-connected part of the corrosion sample 22, and the tensioner 7 is adjusted again to reach the initial preload force. Finally, the manual jack 14 is removed, and the stress corrosion device enters the working state again.

[0077] like Figure 6 As shown, in some embodiments, the tightener 7 includes a screw 71 and an adjustment nut 72. One end of the screw 71 is connected to the second end of the test rope 2, and the second end of the screw 71 passes through the inner wall of the box 1 and is threadedly connected to the adjustment nut 72. The screw 71 is made of a corrosion-resistant, high-strength material, such as stainless steel or aluminum alloy. The length and diameter of the screw 71 should be selected based on the required tension of the test rope 2 and the structure of the box 1 to ensure that the screw 71 can pass through the inner wall of the box 1 and connect with the adjustment nut 72. The adjustment nut 72 is made of a corrosion-resistant, high-strength material, such as stainless steel or aluminum alloy. The thread specifications of the adjustment nut 72 should match those of the screw 71 to ensure smooth insertion and removal. The adjustment nut 72 should be firmly fixed to the inner wall of the box 1 to prevent loosening during testing. An appropriate hole is opened in the inner wall of the box 1 to ensure that the screw 71 can pass through and connect to the adjustment nut 72. The hole size should match the diameter of the screw 71 to ensure smooth insertion. The second end of the test rope 2 should be firmly connected to one end of the screw rod 71 to ensure that the connection point will not loosen or fall off. The extension length of the screw rod 71 can be adjusted by rotating the adjustment nut 72 to change the tension of the test rope 2.

[0078] The second end of the screw rod 71 is passed through the box body 1 and connected to the nut. The nut can be rotated outside the box body 1 to adjust the initial preload force, which is convenient for operation. More specifically, a sealed outer frame 73 can be set on the inner wall of the box body 1, and the screw rod 71 is set in the outer frame 73 to prevent salt spray corrosion. An outer sleeve 74 can also be sleeved on the outer side of the screw rod 71 to guide the screw rod 71. More specifically, the test rope 2 passes through the through hole of the outer frame 73 and is connected to the screw rod 71. A steering block 75 is provided on the outside of the outer frame 73. After being turned by the steering block 75, the test rope 2 extends in the same direction as the through hole and is then connected to the screw rod 71. This can avoid excessive friction between the test rope 2 and the outer frame 73.

[0079] More specifically, the length of the internal threaded rod of the tightener 7 is the tightening stroke, and the relaxation state of the test rope 2 and the elongation of the test rope 2 when the tightener 7 provides the initial pre-tightening force must be considered. The relaxation state of the test rope 2 is controlled by adjusting the error during construction, and the elongation of the initial pre-tightening test rope 2 is controlled by adjusting the error during construction. L is the total length of the test rope 2, mg is the weight of the counterweight 42, β is the lever magnification, n is the number of steel ropes (the number of small-diameter steel ropes when multiple small-diameter steel ropes are wound together), E is the elastic modulus of the steel rope, A is the diameter of the steel rope, and ɑ is the initial prestress coefficient applied to the test rope 2 by adjusting the collector nut, which can be between 0.1 and 0.3.

[0080] In some embodiments, insulating pads are provided at the contact positions between the test rope 2 and the sample 22, the contact positions between the test rope 2 and the tightener 7, and the contact positions between the internal test rope 2 and the fixed pulley 9 to prevent electrochemical corrosion.

[0081] In some embodiments, in order to prevent the counterweight block 42 from suddenly falling and collapsing and the lever arm rod 6 from rotating outward and injuring people, protective beams 10 can be set at corresponding positions outside the counterweight block 42 and the lever arm rod 6. The protective beams 10 can form a frame structure, and the counterweight block 42 and the lever arm rod 6 are set in the space surrounded by the frame structure.

[0082] In some embodiments, a movable step ladder 16 is provided on one side of the box to facilitate the replacement of samples.

[0083] Example 2

[0084] A method for using the above-mentioned stress corrosion device comprises the following steps:

[0085] S1: The stress applying mechanism 4 applies a set stress to the test rope 2;

[0086] S2: Turn on the salt mist generating mechanism 3 to form a salt mist environment in the accommodating space;

[0087] S3: After each set corrosion cycle, a portion of the samples 22 is taken out, and the rope 21 of equal length is used to replace the samples 22 in the original series connection until all the samples 22 are taken out.

[0088] Specifically, the friction loss of the device must be calibrated before the corrosion test. The stress-applying mechanism 4 applies the set stress to the test rope 2 by raising the manual jack 14 to support the counterweight 42, vertically positioning the lever 6, and adjusting the tensioner 7 to apply an initial preload to the test rope 2 and the specimen 22. The manual jack 14 then unloads the load, allowing the internal prestressed steel wire rope and the corrosion specimen 22 to reach the rated value, placing the stress corrosion device in operation.

[0089] like Figure 3 、 Figure 4 and Figure 5As shown, after each set corrosion cycle, taking out part of the test sample 22 includes: taking out the corrosion sample 22 from both sides of the device according to the corrosion cycle, first using the manual jack 14 to unload the weight of the counterweight block 42 when taking out the sample 22, then hanging the anti-drop rope 8 on the reserved hole at the end of the corrosion sample 22, and finally loosening the tightening device 7 so that the dead weight of the test rope 2 and the corrosion sample 22 is transferred to the outer frame beam 111 through the anti-drop rope 8; using a rope body 21 of equal length to replace the original series part of the corrosion sample 22, and adjusting the tightening device 7 again to reach the initial preload force, and finally removing the manual jack 14, and the stress corrosion device enters the working state again; repeating the above steps, taking out the test blocks from top to bottom according to the corrosion cycle until the test is completed.

[0090] Thus far, various embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0091] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present disclosure. In particular, as long as there are no structural conflicts, the various technical features mentioned in the various embodiments may be combined in any manner.

Claims

1. A stress corrosion device, characterized in that: include: A box body, wherein the inner wall of the box body forms an accommodating space; A plurality of ropes, the plurality of ropes being arranged in the accommodating space, and the plurality of ropes being able to be connected end to end with a plurality of specimens to form a test rope; a salt mist generating mechanism, the salt mist generating mechanism being arranged in the accommodating space and being used for forming a salt mist environment in the accommodating space; a stress applying mechanism connected to the first end of the test rope; Wherein, the second end of the test rope is fixedly connected to the inner wall of the box.

2. The stress corrosion device according to claim 1, characterized in that A plurality of first steering mechanisms are provided on the inner wall of the box, and the test rope is connected to the stress applying mechanism after being redirected by the plurality of first steering mechanisms.

3. The stress corrosion device according to claim 2, characterized in that The plurality of first steering mechanisms are evenly arranged on the first side and the second side of the box, the first side and the second side are opposite sides, and the test ropes are alternately wound around the first steering mechanisms on the first side and the second side.

4. The stress corrosion device according to claim 3, characterized in that The box includes: A frame structure, wherein the frame structure is surrounded by a plurality of outer frame beams and columns; Mist shields are installed on multiple sides of the frame structure and connected to multiple outer frame beams and columns; A balance beam, wherein both ends of the balance beam are respectively connected to the columns arranged on the first side and the second side.

5. The stress corrosion device according to claim 1, characterized in that The stress applying mechanism includes a connecting rope and a counterweight block, one end of the connecting rope is connected to the first end of the test rope, and the other end of the connecting rope is connected to the counterweight block, and the counterweight block is in a suspended state.

6. The stress corrosion device according to claim 5, characterized in that The stress applying mechanism further comprises a lever arm and a fixed pulley, wherein the fixed pulley is arranged at one end of the lever arm; The fixed pulley includes a rotating shaft, a bearing, and a rotating wheel. Both ends of the rotating shaft are fixedly connected to the support frame. The rotating shaft is arranged at the center of the rotating shaft. The bearing is arranged between the rotating shaft and the rotating wheel. One end of the test rope is connected to the outer periphery of the rotating wheel, and one end of the connecting rope is connected to the other end of the force arm rod.

7. The stress corrosion device according to claim 6, characterized in that The lever arm is arranged on the second side of the box body, a second steering mechanism is arranged on the top of the first side of the box body, and the connecting rope passes through the second steering mechanism from the top end of the lever arm and is connected to the counterweight block.

8. The stress corrosion device according to claim 6, characterized in that Also includes: A tightener, the tightener being arranged on the inner wall of the box and connected to the second end of the test rope; An anti-slip rope, one end of which is fixedly connected to the box body, and the other end of which can be connected to the sample.

9. The stress corrosion device according to claim 8, characterized in that: The tightener includes a screw and an adjusting nut. One end of the screw is connected to the second end of the test rope, and the second end of the screw passes through the inner wall of the box and is threadedly connected to the adjusting nut.

10. A method for using the stress corrosion device according to any one of claims 1 to 9, characterized in that: The steps include: The stress applying mechanism applies a set stress to the test rope; Turn on the salt mist generating mechanism to form a salt mist environment in the accommodating space; After each set corrosion cycle, some samples are taken out and the samples in the original series connection are replaced with ropes of equal length until all samples are taken out.

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