Stress corrosion device and use method thereof

Abstract

The invention provides a stress corrosion device and a use method thereof, and relates to the technical field of stress corrosion. The stress corrosion device comprises a box body, a plurality of rope bodies, a salt mist generating mechanism and a stress applying mechanism, wherein an accommodating space is defined by the inner wall of the box body; the plurality of rope bodies are arranged in the accommodating space, and the plurality of rope bodies and the plurality of samples can be connected end to end to form a test rope; the salt mist generating mechanism is arranged in the accommodating space and is used for forming a salt mist environment in the accommodating space; the stress applying mechanism is connected with the first end of the test rope; and the second end of the test rope is fixedly connected to the inner wall of the box body. According to the invention, the corrosion resistance of a plurality of samples can be examined under the condition that the same stress is applied to the samples.

Description

Technical Field

[0001] The present disclosure relates to the technical field of stress corrosion, and particularly to a stress corrosion device and a method for using the same. Background Art

[0002] Existing indoor accelerated corrosion tests are mostly carried out through a salt spray test chamber, which creates an artificially simulated salt spray environment to evaluate the corrosion resistance of materials or products.

[0003] When conducting a salt spray test, first, the test specimens need to be placed in the test chamber. Then, the temperature and humidity in the test chamber are adjusted to the set values, and an appropriate amount of sodium chloride solution is added to the sprayer. After starting the test chamber for a period of time, the surface state of the specimens is checked, the inspection results are recorded, the specimens are surface-cleaned, and the test effect is evaluated. Finally, a test report is completed.

[0004] However, when conducting a salt spray test, the specimens in the salt spray test chamber are in a zero-stress state, which does not conform to the actual engineering situation. In existing stress tests, the stress on each specimen is generally applied individually by a jack in cooperation with a reaction frame, which is not convenient for applying stress to a large number of specimens simultaneously. Summary of the Invention

[0005] One technical problem to be solved by the present disclosure is: how to evaluate the corrosion resistance of multiple specimens under the condition of applying the same stress to them.

[0006] To solve the above technical problem, an embodiment of the present disclosure provides a stress corrosion device, including:

[0007] A box body, the inner wall of which encloses a containing space;

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

[0009] A salt spray generating mechanism, which is arranged in the containing space and is used to form a salt spray environment in the containing space;

[0010] A stress applying mechanism, which is connected to the first end of the test rope;

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

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

[0013] In some embodiments, a plurality of first steering mechanisms are evenly arranged on the first side and the second side of the box, respectively, 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 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 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.

[0021] In some embodiments, the lever arm is fixedly connected to the second side of the box body, a second steering mechanism is provided at the top of the first side of the box body, and the connecting rope is connected to the counterweight block after passing 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.

[0022] In some embodiments, it also includes:

[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 sample.

[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] Open the salt spray generating mechanism to form a salt spray environment in the accommodating space;

[0029] After each set corrosion cycle, take out some specimens and replace the specimens in the original series connection part with rope bodies of equal length until all specimens are taken out.

[0030] Through the above technical solution, the stress corrosion device provided by the present disclosure can form a test rope by connecting multiple rope bodies end to end with specimens, connect the stress applying mechanism to the first end of the test rope, and fixedly connect the second end of the test rope to the inner wall of the box body, so that the stress applying mechanism can apply stress to the test rope, and then apply equal stress to multiple specimens in the test rope; a salt spray environment is formed in the accommodating space through the salt spray generating mechanism, so as to evaluate the corrosion resistance of multiple specimens under the condition of applying equal stress. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

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

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

[0034] Figure 3 It is a schematic structure diagram of the stress corrosion device before replacing some specimens in the embodiment of the present disclosure;

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

[0036] Figure 5 It is a schematic structure diagram of the stress corrosion device after replacing some specimens in the embodiment of the present disclosure;

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

[0038] Description of the Reference Numerals:

[0039] 1. Box body; 11. Frame structure; 111. Outer frame beam; 112. Column; 12. Fog-proof board; 15. Balance beam; 2. Test rope; 21. Rope body; 22. Specimen; 3. Salt spray generating mechanism; 4. Stress applying mechanism; 41. Connecting rope; 42. Counterweight; 5. First steering mechanism; 6. Lever arm; 7. Tightener; 71. Screw; 72. Adjusting nut; 73. Outer frame; 74. Outer sleeve; 75. Steering block; 8. Anti-detachment rope; 9. Fixed pulley; 10. Protection beam; 13. Second steering mechanism; 14. Jack; 16. Mobile step ladder; 17. Support frame; R. Lever arm length; r. Fixed pulley outer diameter. Detailed implementation manners

[0040] The following further describes in detail the implementation manners of the present disclosure in conjunction with the accompanying drawings and embodiments. The detailed descriptions and drawings of the following embodiments are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms, not limited to the specific embodiments disclosed herein, but including all technical solutions falling within the scope of the claims.

[0041] These embodiments are provided by the present disclosure to make the present 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 arrangements of components and steps, the components of materials, numerical expressions and values described in these embodiments should be construed as merely exemplary, rather than as limitations.

[0042] It should be noted that in the description of the present disclosure, unless otherwise specified, the meaning of "a plurality" is greater than or equal to two; the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0043] In addition, the "first", "second" and similar terms used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. The terms "including" or "comprising" and the like mean that the elements before this word are covered by the elements listed after this word, and do not exclude the possibility of also covering other elements.

[0044] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances. When it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0045] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as those, should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such herein.

[0046] Technologies, methods, and devices known to those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the specification.

[0047] Existing indoor accelerated corrosion tests are mostly carried out through a salt spray test chamber, which creates an artificially simulated salt spray environment to evaluate the corrosion resistance of materials or products.

[0048] When conducting a salt spray test, first, the test specimens need to be placed in the test chamber. Then, the temperature and humidity in the test chamber are adjusted to the set values, and an appropriate amount of sodium chloride solution is added to the sprayer. After starting the test chamber for a period of time, the surface state of the specimens is inspected, the inspection results are recorded, the specimens are cleaned on the surface, and the test effect is evaluated. Finally, a test report is completed.

[0049] However, when conducting a salt spray test, the specimens in the salt spray test chamber are in a zero-stress state, which does not conform to the actual engineering situation. In existing stress tests, the stress of each specimen is generally applied separately through a jack in cooperation with a reaction frame. The space in the salt spray test chamber is limited, making it inconvenient to apply stress to a large number of specimens simultaneously.

[0050] To solve the above technical problems, the present disclosure proposes a stress corrosion device and its usage method, which can evaluate the corrosion resistance of multiple specimens under the condition of applying the same stress to them.

[0051] Example 1

[0052] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5and Figure 6 As shown, a stress corrosion device includes a box body 1, multiple rope bodies 21, a salt spray generating mechanism 3 and a stress applying mechanism 4, wherein the inner wall of the box body 1 forms an accommodating space; the multiple rope bodies 21 are arranged in the accommodating space, and the multiple rope bodies 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 body 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 also be set to maintain their shape and stability. For example, support beams can be set 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 product made of two or more strands of fiber materials in a certain way (such as twisting, braiding). It has high tensile strength and good flexibility, and can maintain a stable shape while bearing a large tensile force. Specifically, the rope body 21 can be a synthetic fiber rope, including polypropylene, nylon, polyester, polyethylene, rayon, etc. Synthetic fiber ropes are 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 twisted by multiple layers of steel wire according to certain rules and has extremely high strength and wear resistance. In order to improve the corrosion resistance of the steel wire rope, the surface of the steel wire rope can be galvanized, aluminum-plated, and galvanized aluminum alloy-plated; anti-corrosion paint can also be sprayed or brushed on the surface of the steel wire rope to form a protective film to isolate the corrosive medium; plastic materials such as polyethylene and polyvinyl chloride can also be used to wrap the steel wire rope to form a dense protective layer to effectively prevent the intrusion of moisture and corrosive substances; stainless steel wire ropes can also be used, which have excellent corrosion resistance and are suitable for extreme corrosive environments.

[0055] The connection between the rope body 21 and the specimen 22 needs to ensure that during the application of stress, the specimen 22 can stably bear the load and will not affect the test results due to improper connection in a corrosive environment. Specifically, the rope body 21 can be directly knotted at both ends of the specimen 22 without the need for additional connection tools or equipment, which is cost-effective. The rope body 21 and the specimen 22 can also be fixed together using a fixture to ensure the firmness of the connection. When in use, one end of the specimen 22 can be inserted into the fixture, ensuring that the contact surface between the specimen 22 and the fixture is flat and gapless, and one end of the rope body 21 is fixed on the other side of the fixture to ensure the firm connection between the rope body 21 and the fixture. Threaded connection can also be used to ensure a very firm connection between the rope body 21 and the specimen 22, and the threaded connection is convenient for disassembling and replacing the specimen 22. When in use, a threaded hole can be machined at one end of the specimen 22, or a connecting piece with a threaded hole can be used to fix the specimen 22, and then one end of the rope body 21 is fixed on the screw 71 to ensure a firm connection. Finally, the nut is tightened to ensure a firm and reliable connection between the rope body 21 and the specimen 22. The rope body 21 and the specimen 22 can also be permanently connected by welding, with a very high connection strength. The rope body 21 and the specimen 22 can also be crimped together using a crimping tool, with a reliable connection.

[0056] The salt spray generating mechanism 3 is a device used to simulate a salt spray corrosion environment for testing 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 body 1, and the nozzle faces the inside or the central area of the box body 1 to facilitate the rapid filling of the salt spray with droplets. 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 arranged in the liquid storage tank to transport the salt solution from the liquid storage tank to the nozzle. The filter is arranged on the connecting pipe between the pump and the nozzle, which can filter the salt solution to remove impurities and prevent the nozzle from being blocked. More specifically, the liquid storage tank can be set inside the box body 1 or outside the box body 1 and is connected to the sprayer through a pipeline. More specifically, the salt spray generating mechanism 3 can also include a salt spray collector, which is set at the bottom of the box body 1 to collect the falling salt spray to facilitate subsequent analysis of the salt spray components. As long as the salt spray generating mechanism 3 can simulate the salt spray corrosion environment, the specific structure of the salt spray generating mechanism 3 is not limited.

[0057] The stress application mechanism 4 is a device capable of applying a predetermined mechanical stress to the specimen 22. Specifically, the stress application mechanism 4 can be a device for performing a static tensile test on a material or component, and the mechanical properties of the material are evaluated by applying a constant tensile load. More specifically, the stress application mechanism 4 can be a manual tensile testing machine, which applies a load manually through a handwheel or a lever, etc. It has a simple structure and a low cost. It can also be an electronic universal testing machine, which is driven by an electric motor and applies a load through a transmission mechanism such as a lead screw or a ball screw. Equipped with high-precision force sensors and displacement sensors, it can accurately measure the load and displacement. The loading process can be controlled by computer software to record and analyze test data. The stress application mechanism 4 can also be a hydraulic tensile testing machine, which applies a load using a hydraulic cylinder and can apply a very large load, suitable for testing high-strength materials. The hydraulic system provides a stable loading force and is suitable for long-term tests. More specifically, the stress application mechanism 4 can also be a counterweight 42, which is in a suspended state and applies a stable load to the rope of the specimen 22. It has a low cost and is suitable for applying a stable load for a long time. As long as the stress application mechanism 4 can apply a predetermined mechanical stress to the specimen 22, the specific structure and type of the stress application mechanism 4 are not limited.

[0058] Through the above technical solutions, the stress corrosion device provided by the present disclosure enables multiple rope bodies 21 to be connected end to end with the specimen 22 to jointly form a test rope 2, connects the stress application mechanism 4 to the first end of the test rope 2, and fixedly connects the second end of the test rope 2 to the inner wall of the box body 1, so that the stress application mechanism 4 can apply stress to the test rope 2, and further apply the same stress to multiple specimens 22 in the test rope 2; the salt spray generating mechanism 3 is also used to form a salt spray environment in the accommodation space, so as to evaluate the corrosion resistance of multiple specimens 22 under the condition of applying the same stress; different magnitudes of stress can also be applied through the stress application mechanism, so as to realize simultaneous testing of specimens with multiple stress levels in the same corrosion environment for multiple corrosion cycles.

[0059] In some embodiments, a plurality of first turning mechanisms 5 are provided on the inner wall of the box body 1, and the test rope 2 is connected to the stress application mechanism 4 after being turned by the plurality of first turning mechanisms 5. Such a setting can not only increase the length of the test rope 2, but also enable more specimens 22 to be accommodated in the box body 1.

[0060] The first steering mechanism 5 refers to a device for changing 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, and the test rope 2 passes through the guide ring to achieve steering. The steering mechanism can also be a guide wheel, which consists of a central axis and a rotating wheel, and the wheel surface is smooth to reduce friction. More specifically, the central axis of the guide wheel is fixed to the inner wall of the box 1 to ensure the stability of the position of the guide wheel; the rotating wheel can be made of corrosion-resistant materials such as metal (such as stainless steel), nylon or polyurethane, with a smooth surface to reduce friction with the test rope 2; the bearing is located between the central axis and the rotating wheel to ensure that the wheel can rotate freely. More specifically, the guide wheel can be a fixed pulley, and the test rope 2 is set in the rope groove of the rotating wheel to ensure that the position of the rope on the pulley is fixed. More specifically, the first steering mechanism 5 can also be a pulley group, which consists of multiple pulleys and can achieve multi-stage steering. Through the synergistic effect of multiple pulleys, complex path changes can be achieved and the effective length of the test rope 2 can be increased. The first steering mechanism 5 may also include a fixed bracket, which may be connected to the central axis of the guide wheel, so as to fix the first steering mechanism 5 to the inner wall of the box body 1. More specifically, a limit block may be provided between the plurality of fixed pulleys, and the fixed pulleys may be sealed by fiber plastic without shear stiffness to prevent the corrosive gas from penetrating into the fixed pulleys, and to avoid the increase in the friction of the corrosion device after the internal rust of the fixed pulleys. More specifically, the plurality of first steering mechanisms 5 may be distributed on the adjacent two sides of the box body 1, or on the opposite two sides of the box body 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 staggered and wound around the first steering mechanism 2 on the first side and the second side, which can form a path for further increasing the test rope 2, thereby loading more specimens 22. Specifically, one end of the test rope 2 can be fixed to a fixed point of 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 side and the second side in sequence, forming a staggered connection, and the test rope 2 is finally connected to the stress applying mechanism 4 after passing through the last steering mechanism.

[0063] For example, in a stress corrosion test device, eight fixed pulleys are provided on the inner wall of the box body 1. The first fixed pulley, the third fixed pulley, the fifth fixed pulley, and the seventh fixed pulley are evenly spaced on the first side of the box body 1, and the second fixed pulley, the fourth fixed pulley, the sixth fixed pulley, and the eighth fixed pulley are evenly spaced on the second side of the box body 1. The connection method of the test rope 2 is as follows: One end of the test rope 2 is fixed to the inner wall of the box body 1. The test rope 2 passes through the first fixed pulley to change the direction, and then the test rope 2 passes through the second fixed pulley, the third fixed pulley, the fourth fixed pulley, the fifth fixed pulley, the sixth fixed pulley, the seventh fixed pulley in turn to further change the direction, and the test rope 2 passes through the eighth fixed pulley to finally change the direction.

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

[0065] By evenly arranging a plurality of first steering mechanisms 5 on the first side and the second side of the box body 1 respectively and connecting them in a staggered manner, the specimens 22 between every two first steering mechanisms 5 can be parallel to each other. For example, the specimen 22 between the first steering mechanism 5 and the second steering mechanism is parallel to the specimen 22 between the second steering mechanism and the third steering mechanism, that is, the stress application directions of multiple specimens 22 are the same, so as to control the test variables and improve the measurement accuracy.

[0066] Such as Figure 1 and Figure 2As shown, in some embodiments, the box body 1 includes a frame structure 11, a fog-proof plate 12, and a balance beam 15. The frame structure 11 is surrounded by a plurality of outer frame beams 111 and columns 112. The fog-proof plate 12 is installed on multiple sides of the frame structure 11, and the fog-proof plate 12 is connected to the plurality of outer frame beams 111 and columns 112 to block the sides of the frame structure 11 and prevent salt spray from overflowing. Both ends of the balance beam 15 are respectively connected to the columns 112 provided 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, and the fog-proof plate 12 is installed on six faces of the square frame to form a sealed box body 1. The fog-proof plate 12 adjacent to the first side and the second side is detachably connected to the frame structure 11, facilitating the batch removal of samples.

[0067] The balance beam 15 can be made of corrosion-resistant and high-strength materials such as stainless steel or aluminum alloy. The balance beam 15 can be set as a long strip or a frame shape. For example, it can be a square steel pipe or an I-beam to ensure sufficient rigidity and stability. The balance beam 15 is firmly fixed between the first side and the second side of the box body 1 to ensure no displacement during the test. By setting the balance beam 15, the strength of the box body 1 is enhanced to offset the influence of the pre-tightening force of the test rope 2 on the box body 1.

[0068] As Figure 1 and Figure 2 As shown, in some embodiments, the stress application 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. The counterweight 42 is in a suspended state. A constant tension is applied through the connecting rope 41 and the counterweight 42 to ensure that the test rope 2 applies uniform stress on the specimen 22. This design is simple and reliable, especially suitable for this kind of stress corrosion test that requires a constant load. Compared with a tensile testing machine, it can apply a constant load stress over a longer period (such as one to two years), avoiding the instability of the applied load due to an overly long test period. Specifically, the connecting rope 41 can be made of corrosion-resistant and high-strength materials, and its structure, shape, and composition materials can also be the same as those of the rope body 21, such as stainless steel or nylon rope. More specifically, the length of the connecting rope 41 can be determined according to the test requirements and the size of the box body 1. The weight of the counterweight 42 can be selected according to the test requirements to ensure that the applied tension meets the test standards. The counterweight 42 should be in a suspended state to ensure a constant tension and be unaffected by the ground or other objects.

[0069] As Figure 1 and Figure 2As shown, in some embodiments, the stress application mechanism 4 further includes a lever arm 6 and a fixed pulley 9. The fixed pulley 9 is disposed at one end of the lever arm 6. The fixed pulley 9 includes a rotating shaft, a bearing, and a runner. Both ends of the rotating shaft are fixedly connected to the support frame 17. The rotating shaft is disposed at the center of the rotating shaft, and the bearing is disposed between the rotating shaft and the runner. One end of the test rope 2 is connected to the outer periphery of the runner, 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 and 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 no displacement during the test. More specifically, the fixing bracket of the fixed pulley 9 can be welded to the lever arm 6. Connecting one end of the test rope 2 to the outer periphery of the runner and one end of the connecting rope 41 to the other end of the lever arm 6 can form a laborious lever. As Figure 1 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 the first arm of force. The gravity of the counterweight 42 is the first pulling force. The outer diameter r of the fixed pulley 9 is the second arm of force. The pulling force of the test rope 2 at the bottom of the counterweight 42 is the second pulling force. The product of the first arm of force and the first pulling force is equal to the product of the second arm of force and the second pulling force. That is, 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. By magnifying the multiple of the weight of the counterweight 42 through the lever arm 6, the weight of the counterweight 42 can be significantly reduced, thereby simplifying the design of the test device and improving the convenience of the test.

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

[0072] In some embodiments, the lever arm 6 is fixedly connected to the second side of the box body 1, and a second steering mechanism 13 is provided at the top of the first side of the box body 1. The connecting rope 41 is connected to the counterweight 42 after passing 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 in sequence. 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 is connected to the counterweight 42 after passing through the bottom end, the top end and the second steering mechanism 13 at the top of the first side of the box body 1 in sequence, that is, the sample 22 is connected to the counterweight 42 after the rope passes through the box body 1 for one circle. Not only can the lever arm 6 be used to amplify the tension of the counterweight 42, but the height of the box body 1 can also be used to make the counterweight 42 suspended, thereby optimizing the structural space and improving the space utilization efficiency.

[0073] In some embodiments, it also includes a tightener 7 and an anti-drop rope 8, the tightener 7 is arranged on the inner wall of the box body 1, and the tightener 7 is connected to the second end of the test rope 2; one end of the anti-drop rope 8 is fixedly connected to the box body 1, and the other end of the anti-drop 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 can adjust the tension manually or automatically to ensure that the connecting piece maintains the required tension during use. Specifically, the tensioner 7 can be a manual tensioner 7. For example, a threaded tensioner 7, a handle tensioner 7, and a ratchet tensioner 7, which adjust the tension by rotating the thread. Common forms include the combination of a nut and a screw 71. Users can adjust the tension of the rope by rotating the nut; the handle tensioner 7 adjusts the tension by manually operating the handle. The handle tensioner 7 has a large adjustment range and is suitable for occasions where frequent tension adjustment is required. The ratchet tensioner 7 locks and releases the tension through a ratchet mechanism. Users can adjust the tension by rotating the handle and then lock the current position through the ratchet. The automatic tensioner 7 can be a spring tensioner 7: using the elastic force of the spring to automatically adjust and maintain the tension. When the tension of the connecting piece changes, the spring will automatically expand and contract to maintain a constant tension. The tensioner 7 can also be a hydraulic tensioner 7: automatically adjusting and maintaining the tension through a hydraulic system. The hydraulic tensioner 7 is usually used in occasions that require high precision and high stability. The tensioner 7 can also be an electric tensioner 7: automatically adjusting and maintaining the tension through the drive of an electric motor. The electric tensioner 7 can be precisely adjusted through a controller and is suitable for applications with a high degree of automation. The tensioner 7 can also be a fixed tensioner 7, such as a fixed nut tensioner 7 and a clamping tensioner 7. The fixed nut tensioner 7 adjusts and locks the tension through a fixed nut. Users can adjust the tension by rotating the nut and then tighten the fixed nut to lock the current position. The clamping tensioner 7 fixes and adjusts the tension through a clamping mechanism. The clamping tensioner 7 usually has a simple structure and is suitable for quickly adjusting and locking the tension.

[0075] Setting the tensioner 7 can make the slack test rope 2 taut and apply an initial pre-tightening force, and then apply stress through the counterweight 42, avoiding different stresses on different positions of the test rope 2 caused by multiple turns and improving the uniformity of the force on the specimen 22. Specifically, the counterweight 42 and the lever 6 can be supported by the jack 14 or the support block first so that they do not apply tension to the test rope 2, and then the tensioner 7 is used to tighten the slack test rope 2 and apply an initial pre-tightening force to avoid potential safety hazards caused by the inclination of the lever 6 due to the slack of the test rope 2.

[0076] Such as Figure 3 、 Figure 4 and Figure 5As shown, setting the anti-drop rope 8 can facilitate the removal or replacement of the specimen 22 and prevent part of the test rope 2 and the specimen 22 from falling off when replacing the specimen 22. Specifically, when taking the specimen 22, the weight of the counterweight 42 can be unloaded first using the manual jack 14, then the anti-drop rope 8 can be hung on the reserved hole at the end of the specimen 22, and finally the tensioner 7 can be loosened so that the self-weight of the test rope 2 and the corrosion specimen 22 is transmitted to the inner wall or the outer frame beam 111 of the box body 1 through the anti-drop rope 8. The corrosion specimen 22 in the original series part can be replaced with an equal-length steel wire rope, the tensioner 7 is adjusted again to reach the initial pre-tightening force, and finally the manual jack 14 is removed, and the stress corrosion device enters the working state again.

[0077] As Figure 6 shown, in some embodiments, the tensioner 7 includes a screw rod 71 and an adjusting nut 72. One end of the screw rod 71 is connected to the second end of the test rope 2, and the second end of the screw rod 71 passes through the inner wall of the box body 1 and is threadedly connected to the adjusting nut 72. The screw rod 71 is made of corrosion-resistant and high-strength materials such as stainless steel or aluminum alloy. The length and diameter of the screw rod 71 should be selected according to the tension requirements of the test rope 2 and the structure of the box body 1 to ensure that the screw rod 71 can pass through the inner wall of the box body 1 and be connected to the adjusting nut 72. The adjusting nut 72 is made of corrosion-resistant and high-strength materials such as stainless steel or aluminum alloy. The thread specification of the adjusting nut 72 should match that of the screw rod 71 to ensure that the screw rod 71 can be smoothly screwed into and out of the adjusting nut 72. The adjusting nut 72 should be firmly fixed on the inner wall of the box body 1 to prevent loosening during the test. Appropriate holes are opened on the inner wall of the box body 1 to ensure that the screw rod 71 can pass through and be connected to the adjusting nut 72. The diameter of the hole should match the diameter of the screw rod 71 to ensure that the screw rod 71 can pass through smoothly. 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. By rotating the adjusting nut 72, the extended length of the screw rod 71 can be adjusted, thereby changing the tension of the test rope 2.

[0078] Passing the second end of the screw rod 71 through the box body 1 and connecting it to the nut allows the nut to be rotated outside the box body 1 to adjust the initial pre-tightening force, which is convenient for operation. More specifically, a sealed outer frame 73 can be provided on the inner wall of the box body 1, and the screw rod 71 is arranged inside the outer frame 73 to prevent salt spray corrosion. An outer sleeve 74 can also be sleeved outside the screw rod 71, and the outer sleeve 74 can 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 turning block 75 is provided on the outside of the outer frame 73. After the test rope 2 is turned by the turning block 75, it is in the same direction as the extension direction of the through hole, and then is connected to the screw rod 71, which can prevent the friction between the test rope 2 and the outer frame 73 from being too large.

[0079] More specifically, the length of the internal threaded rod of the tightener 7 is the tightening stroke. It is necessary to consider the slack state of the test rope 2 and the elongation of the test rope 2 when the tightener 7 provides the initial pre-tightening force. Among them, the slack state of the test rope 2 is controlled by adjusting the construction error, and the elongation of the test rope 2 under the initial pre-tightening force L is the total length of the test rope 2, mg is the weight of the counterweight 42, β is the lever amplification factor, n is the number of steel wire ropes (the number of small-diameter steel wire ropes when multiple small-diameter steel wire ropes are wound together), E is the elastic modulus of the steel wire rope, A is the diameter of the steel wire 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 specimen 22, between the test rope 2 and the tightener 7, and 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 42 from suddenly falling and collapsing and the force arm rod 6 from rotating outward and hurting people, a protective beam 10 can be provided at the corresponding positions around the counterweight 42 and the force arm rod 6. The protective beam 10 can form a frame structure, and the counterweight 42 and the force arm rod 6 are arranged in the space enclosed by the frame structure.

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

[0083] Embodiment 2

[0084] A method for using the above stress corrosion device includes the following steps:

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

[0086] S2: Open the salt spray generating mechanism 3 to form a salt spray environment in the accommodating space;

[0087] S3: After each set corrosion cycle, take out some specimens 22 and replace the specimens 22 in the original series part with rope bodies 21 of equal length until all specimens 22 are taken out.

[0088] Specifically, the friction loss of the device needs to be calibrated before the corrosion test. The stress application mechanism 4 applying a set stress to the test rope 2 includes: jacking up the manual jack 14 to support the counterweight 42 to make the force arm rod 6 vertical, and adjusting the tightener 7 to apply an initial pre-tightening force to the test rope 2 and the specimen 22. The manual jack 14 is unloaded so that the internal prestressed steel wire rope and the corrosion specimen 22 reach the rated value, and the stress corrosion device is in a working state.

[0089] Such as Figure 3 、 Figure 4 and Figure 5As shown, after each set corrosion cycle, taking out part of the specimens 22 includes: according to the corrosion cycle, taking out the corrosion specimens 22 from both sides of the device. When taking the specimens 22, first use the manual jack 14 to unload the weight of the counterweight 42, then hang the anti-disengagement rope 8 on the reserved hole at the end of the corrosion specimen 22, and finally loosen the tensioner 7 so that the self-weight of the test rope 2 and the corrosion specimen 22 is transmitted to the outer frame beam 111 through the anti-disengagement rope 8; replace the original series-connected part of the corrosion specimens 22 with the rope body 21 of equal length, adjust the tensioner 7 again to make it reach the initial pre-tightening force, and finally remove the manual jack 14, and the stress corrosion device enters the working state again; repeat the above steps, take out the specimens sequentially from top to bottom according to the corrosion cycle until the test ends.

[0090] So far, the embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0091] Although some specific embodiments of the present disclosure have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be equivalently replaced without departing from the scope and spirit of the present disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in each of the embodiments can be combined in any way.

Claims

1. A stress corrosion device, characterized in that include: A box body, wherein the inner wall of the box body encloses a containing space; A plurality of rope bodies, wherein the plurality of rope bodies are arranged in the accommodating space, and the plurality of rope bodies can be connected end to end with a plurality of specimens to form a test rope; A salt mist generating mechanism, which is arranged in the accommodating space and is used to form 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 arranged on the inner wall of the box body, and the test rope is connected to the stress applying mechanism after being turned 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, respectively. 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.

4. The stress corrosion device according to claim 3, characterized in that: The box body comprises: A frame structure, wherein the frame structure is surrounded by a plurality of outer frame beams and columns; A mist shield, which is installed on multiple sides of the frame structure and connected to multiple outer frame beams and columns; A balance beam, two ends of which 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 comprises a connecting rope and a counterweight block, one end of the connecting rope is connected to the first end of the test rope, 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 a 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.

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, which is 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 comprises a screw rod and an adjusting nut. One end of the screw rod is connected to the second end of the test rope, and the second end of the screw rod passes through the inner wall of the box and is threadedly connected to the adjusting nut.

10. A method for using a stress corrosion device according to any one of claims 1-9, characterized in that, The steps include: The stress application mechanism applies a set stress to the test rope; The salt spray generating mechanism is turned on to form a salt spray environment in the accommodation space; After each set corrosion cycle, a part of the specimens is taken out, and the rope bodies of equal length are used to replace the specimens in the original series-connected part until all the specimens are taken out.

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