Anchor rod and anchor cable tension shear variable load temperature control stress corrosion test system and method

Abstract

The embodiment of the invention discloses an anchor rod and anchor cable tension-shear variable-load temperature-control stress corrosion test system and method, relates to the technical field of corrosion test, and can effectively improve the environment simulation reality degree of an anchor rod and anchor cable corrosion test. The system comprises a fixer, a colorless transparent double-layer corrosion box, a tested piece, a corrosive liquid pipeline, a corrosive gas pipeline and a force loader, the colorless transparent double-layer corrosion box is connected to the fixer and is provided with an accommodating cavity for observing the internal condition; the corrosive liquid pipeline and the corrosive gas pipeline are used for spraying corrosive liquid and corrosive gas to a tested piece and are used for simulating a corrosive environment; a tested piece penetrates through the containing cavity of the colorless and transparent double-layer corrosion box, the two ends of the tested piece are connected to the fixing devices, and the tested piece is an anchor rod or an anchor cable; the force loader is used for applying tensile stress and shear stress to a preset position of the tested piece. The device is suitable for the corrosion test scene of the anchor rod and the anchor cable, the tension-shear alternating stress state of the underground coal mine anchor rod and the anchor cable can be simulated, the underground environment simulation is perfected, and the corrosion monitoring dimension is increased.

Description

Technical Field

[0001] The present application relates to the technical field of corrosion testing, and in particular to a system and method for testing stress corrosion of anchor rods and anchor cables under shear loading and temperature control. Background Art

[0002] As coal mining continues to move deeper, anchor rods and anchor cables have become the most important supporting materials for underground coal mining. However, anchor rods and anchor cables in underground coal mines are subjected to complex ground stress and corrosion factors such as high temperature and humidity, H2S, SO2 gas, and dissolved oxygen, PH, NO3 - 、Cl - The erosion of mine water environment corrosion factors such as corrosion factors causes the anchor rods and cables to be damaged prematurely before reaching the breaking strength and service life. The support failure threatens the life safety of underground workers, affects the safe production of mines, and reduces the production efficiency of coal mines.

[0003] Existing corrosion testing equipment has the following problems: First, the loading function is single-ended. Traditional equipment can only achieve unidirectional tensile stress static loading and cannot simulate the multi-directional alternating tension and shear stress state of underground anchor bolts and cables; second, the simulation of the underground coal mine environment is imperfect. Most existing corrosion testing equipment uses a solution filled into a corrosion chamber for immersion corrosion testing, which cannot truly simulate the dynamic temperature and humidity corrosion conditions underground; third, the monitoring dimension is insufficient, lacking the simultaneous collection and correlation analysis of mechanics, temperature, corrosion parameters and corrosion processes. Therefore, how to solve the problem of the single loading function of corrosion testing equipment, the imperfect coal mine environment simulation, and the insufficient monitoring dimension has become an urgent problem to be solved in this field. Summary of the Invention

[0004] In view of this, the present application provides an anchor rod and anchor cable tensile shear load temperature controlled stress corrosion test system and method, which can effectively improve the degree of realism of environmental simulation of anchor rod and anchor cable corrosion test.

[0005] In a first aspect, an embodiment of the present application provides an anchor rod and anchor cable tensile shear load temperature control stress corrosion test system, comprising: a fixture; a colorless and transparent double-layer corrosion box, the colorless and transparent double-layer corrosion box being connected to the fixture and having a accommodating cavity for observing the internal conditions; a corrosive liquid pipeline and a corrosive gas pipeline, the corrosive liquid pipeline and the corrosive gas pipeline being used to spray corrosive liquid and corrosive gas on a test piece to simulate a corrosive environment; a test piece, the test piece passing through the accommodating cavity of the colorless and transparent double-layer corrosion box, and the two ends of the test piece being connected to the fixture, wherein the test piece is an anchor rod or an anchor cable; a force loader, the force loader comprising a tensile stress loader and a shear stress loader, for applying tensile stress and shear stress to a preset position of the test piece; an acoustic measuring instrument, the acoustic measuring instrument being equipped with an acoustic signal acquisition cable, the acoustic signal acquisition cable being used to connect to an acoustic signal measurement point of the test piece; and a camera, the camera being used to capture corrosion changes of the test piece.

[0006] In a specific embodiment, the fixture includes a first plate, a second plate, and a frame, the frame is connected between the first plate and the second plate, and the colorless and transparent double-layer corrosion box is fixed to the frame.

[0007] In a specific embodiment, the first plate body is provided with a first clamp, the measured piece is passed through the first clamp and can be clamped by the first clamp; the second plate body is provided with a second clamp, the measured piece is passed through the second clamp and can be clamped by the second clamp.

[0008] In a specific embodiment, the tensile stress loader is provided on one side of the fixture, and is used to apply tension to the test piece passing through the tensile stress loader.

[0009] In a specific embodiment, the shear structure of the shear stress loader extends into the accommodating cavity of the colorless and transparent double-layer corrosion box to apply shear force to the test piece.

[0010] In a specific embodiment, the wall of the colorless, transparent, double-layered corrosion box is a transparent double-layered structure, a transparent heating liquid is injected between the transparent double-layered structures, and a heater is also provided between the transparent double-layered structures of the colorless, transparent, double-layered corrosion box for heating the heating liquid. In a specific embodiment, the corrosion liquid pipeline includes a corrosion liquid tank, a first tube body, and an infusion pump; the wall of the colorless, transparent, double-layered corrosion box is further provided with a first through hole, the corrosion liquid tank is connected to the infusion pump via the first tube body, and the corrosion liquid is introduced into the receiving chamber of the colorless, transparent, double-layered corrosion box through the first tube body. The receiving chamber of the colorless, transparent, double-layered corrosion box is further provided with a nozzle that can communicate with the first tube body, for providing the corrosion liquid to the colorless, transparent, double-layered corrosion box and simulating the mine water spraying environment.

[0011] In a specific embodiment, the corrosive gas pipeline includes a corrosive gas tank, a second tube body, and an air pump; the box wall of the colorless transparent double-layer corrosion box is also provided with a second through hole, the corrosive gas tank is connected to the air pump through the second tube body, and the corrosive gas is introduced into the accommodating cavity of the colorless transparent double-layer corrosion box through the second tube body, which is used to supply corrosive gas to the colorless transparent double-layer corrosion box and simulate the corrosive atmospheric environment of the mine.

[0012] In a specific embodiment, the box wall of the colorless transparent double-layered corrosion box is further provided with a third through hole for guiding the corrosion liquid in the accommodating cavity of the colorless transparent double-layered corrosion box out through the third tube.

[0013] In a specific embodiment, it also includes an electrochemical measuring instrument, which is equipped with a first electrode, a second electrode and a third electrode. The first measuring point of the first electrode is set on the test piece and the first measuring point is located outside the accommodating cavity of the colorless transparent double-layer corrosion box. The second measuring point of the second electrode and the third measuring point of the third electrode are respectively set in the accommodating cavity of the colorless transparent double-layer corrosion box, so as to collect the electrical signal of the test piece during the corrosion process after the corrosion liquid is introduced into the accommodating cavity of the colorless transparent double-layer corrosion box; wherein, the box wall of the colorless transparent double-layer corrosion box is also provided with a fourth through hole for passing the second electrode and the third electrode.

[0014] In a second aspect, an embodiment of the present application further provides a method for stress corrosion testing of anchor rods and cables under shear loading and temperature control, the method comprising: Pass the test piece through the accommodating cavity of the colorless transparent double-layer corrosion box, connect the test piece and the colorless transparent double-layer corrosion box to a fixture, and install a force loader; Connecting the colorless and transparent double-layer corrosion box to the corrosion liquid tank, the corrosion gas tank, and the waste liquid tank respectively; Check and confirm the sealing of the colorless and transparent double-layer corrosion box; heating the colorless transparent double-layer etching box, injecting etching gas into the accommodating cavity of the colorless transparent double-layer etching box, and spraying etching liquid into the accommodating cavity of the colorless transparent double-layer etching box; Using an electrochemical measuring instrument to collect the electrical signal of the test piece, using an acoustic measuring instrument to collect the acoustic signal of the test piece, and using a camera to capture the corrosion changes of the test piece in a colorless and transparent double-layer corrosion box; applying tensile stress and shear stress to the test piece by using the force loader; After the tested piece fails due to stress corrosion, the test is stopped, and the corrosive gas and corrosive liquid in the accommodating cavity of the colorless and transparent double-layer corrosion box are discharged; The test piece is taken out, the failure condition of the test piece is observed, recorded and photographed, and the stress corrosion test results are analyzed.

[0015] The embodiment of the present application provides an anchor rod and cable tension-shear load-controlled temperature stress corrosion test system and method, comprising: a fixture, a colorless and transparent double-layer corrosion box, a test piece, a corrosion liquid pipeline, a corrosion gas pipeline, an acoustic measuring instrument, a camera, and a force loader; the colorless and transparent double-layer corrosion box is connected between the fixtures and has a receiving cavity for observing the internal conditions, and the colorless and transparent double-layer corrosion box is used to simulate a corrosive environment; the test piece passes through the receiving cavity of the colorless and transparent double-layer corrosion box, and both ends of the test piece are connected to the fixture, wherein the test piece is an anchor rod or an anchor cable; the force loader is used to apply tensile stress and shear stress to a preset position of the test piece; the corrosion liquid pipeline and the corrosion gas pipeline are used to simulate a corrosive environment; the acoustic measuring instrument is equipped with an acoustic signal acquisition cable, and the acoustic signal acquisition cable is used to connect to the acoustic signal measurement point of the test piece; the camera is used to capture the corrosion changes of the test piece. The system can effectively improve the degree of realism of the environmental simulation of the anchor rod and cable corrosion test. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 Schematic diagram of a shear-loaded, temperature-controlled stress corrosion test system for anchor rods and cables provided in an embodiment of the present application; Figure 2 Schematic diagram of a colorless and transparent double-layer corrosion box for an anchor rod and cable shear load temperature controlled stress corrosion test system provided in an embodiment of the present application.

[0018] Description of main reference numerals: 100-Corrosion test system; 10-Fixer; 11-First plate; 12-Second plate; 13-Frame; 14-First fixture; 15-Second fixture; 16-Support frame; 20-Colorless and transparent double-layer corrosion chamber; 21-Heating liquid; 22-Heater; 23-Plug; 24-Wire; 25-Temperature controller; 260-First through hole; 261-First tube; 262-Nozzle; 263-Corrosion liquid tank; 264-Infusion pump; 270-Second through hole; 271-Second tube; 272-Corrosion gas tank; 273- Air pump; 280-third through hole; 281-third tube; 282-valve; 283-waste liquid tank; 290-fourth through hole; 30-test piece; 40-force loader; 41-tensile stress loader; 42-shear stress loader; 421-first shear arm; 422-second shear arm; 423-shear drive mechanism; 50-electrochemical measuring instrument; 51-first electrode; 52-second electrode; 53-third electrode; 60-acoustic measuring instrument; 61-acoustic signal acquisition cable; 62-acoustic signal measurement point; 70-camera. DETAILED DESCRIPTION

[0019] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0020] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0021] The existing corrosion test equipment has the following problems: first, the loading function is single, and the traditional equipment can only realize unidirectional tensile stress static loading, which cannot simulate the multi-directional alternating stress state of the anchor bolt and anchor cable in the well; second, the simulation of the underground coal mine environment is not perfect, and most of the existing corrosion test equipment uses the configuration solution to fill the colorless and transparent double-layer corrosion box for immersion corrosion test, which cannot truly simulate the dynamic temperature and humidity corrosion conditions in the well; third, the monitoring dimension is insufficient, and there is a lack of synchronous collection and correlation analysis of mechanics, temperature, corrosion parameters and corrosion process. In order to solve the above problems, on the one hand, such as Figure 1 As shown, an embodiment of the present application provides an anchor rod and anchor cable shear load temperature controlled stress corrosion test system 100, which may include: a fixer 10, a colorless and transparent double-layer corrosion box 20, a test piece 30, a corrosion liquid pipeline, a corrosion gas pipeline, an acoustic measuring instrument, a camera, and a force loader 40.

[0022] A colorless, transparent, double-layered corrosion chamber 20 is connected between the fixtures 10 and has a housing cavity through which the interior can be observed. The colorless, transparent, double-layered corrosion chamber 20 is used to simulate a corrosive environment. In this embodiment, the colorless, transparent, double-layered corrosion chamber 20 can be a cylindrical structure made of a transparent or translucent material, such as tempered glass or plastic, to facilitate observation of the interior of the colorless, transparent, double-layered corrosion chamber 20. The housing cavity of the colorless, transparent, double-layered corrosion chamber 20 facilitates simulation of a corrosive environment, for example, by spraying corrosive liquid or injecting corrosive gas into the housing cavity. The colorless, transparent, double-layered corrosion chamber 20 is detachably connected to the fixture 10 so as to be limited or fixed by the fixture 10. Corrosive liquid pipelines and corrosive gas pipelines are used to simulate a corrosive environment.

[0023] The force loader 40 includes a tensile stress loader 41 and a shear stress loader 42, which are used to apply tensile stress and shear stress to the preset position of the test piece 30; the force loader 40 can simulate the actual stress conditions of the test piece 30 in the working environment. For example, the anchor rod or anchor cable of the test piece 30 is usually subjected to tensile force or shear force in the working environment. Therefore, the force loader 40 can apply axial tensile force to the test piece 30 at the preset position, or apply radial shear force to the test piece 30 at the preset position, thereby more realistically simulating the corrosion test environment of the test piece 30.

[0024] The acoustic measuring instrument 60 is equipped with an acoustic signal acquisition cable, which is used to connect to the acoustic signal measurement point of the test piece 30 ; the camera 70 is used to photograph the corrosion changes of the test piece 30 .

[0025] The test piece 30 passes through the accommodating chamber of the colorless and transparent double-layered corrosion chamber 20, and both ends of the test piece 30 are connected to the fixture 10. The test piece 30 is an anchor rod or an anchor cable. The test piece 30 passes through the accommodating chamber, so that the portion of the test piece 30 in the accommodating chamber can be corroded by the simulated corrosion environment constructed in the accommodating chamber. By observing and measuring the corrosion changes in this portion of the test piece 30, the corrosion conditions of the test piece 30 under the influence of force, temperature, liquid and gas can be analyzed. A seal can be provided between the test piece 30 and the wall of the colorless and transparent double-layered corrosion chamber 20. For example, a seal can be provided at the portion where the test piece 30 passes through the wall of the colorless and transparent double-layered corrosion chamber 20. This prevents the corrosive liquid or corrosive gas in the colorless and transparent double-layered corrosion chamber 20 from leaking, thereby ensuring the sealing of the colorless and transparent double-layered corrosion chamber 20. The seal can be made of an elastic material to have corresponding deformation adaptability to ensure a good sealing effect.

[0026] The embodiment of the present application provides an anchor bolt and cable shear load temperature control stress corrosion test system 100, comprising: a fixture 10, a colorless and transparent double-layer corrosion box 20, a test piece 30, a corrosion liquid pipeline, a corrosion gas pipeline, an acoustic measuring instrument 60, a camera 70, and a force loader 40; the colorless and transparent double-layer corrosion box 20 is connected between the fixtures and has a accommodating cavity for observing the internal conditions. The corrosion liquid pipeline and the corrosion gas pipeline are sprayed on the test piece 30 with corrosion liquid and corrosion gas to simulate a corrosive environment; the test piece The test object 30 passes through the accommodating cavity of the colorless, transparent double-layer corrosion chamber 20, and both ends of the test object 30 are connected to the fixture 10. The test object 30 is an anchor rod or cable. The force loader 40 is used to apply tensile stress and shear stress to the preset position of the test object 30. The corrosion liquid pipeline and the corrosion gas pipeline are used to simulate the corrosive environment. The acoustic measuring instrument 60 is equipped with an acoustic signal acquisition cable, which is used to connect to the acoustic signal measurement point of the test object 30. The camera 70 is used to capture the corrosion changes of the test object 30. This system can effectively improve the realism of the environmental simulation for anchor rod and cable corrosion testing.

[0027] Optionally, in one embodiment of the present application, Figure 1 As shown, the fixture 10 includes a first plate 11, a second plate 12, and a frame 13. The frame 13 is connected between the first plate 11 and the second plate 12, and the colorless transparent double-layer corrosion box 20 is fixed to the frame 13. The first plate 11 and the second plate 12 can be specifically disc-shaped or square-shaped structures. The frame 13 is connected between the first plate 11 and the second plate 12. For example, the frame 13 can be composed of four steel columns, and the two ends of the four steel columns are detachably connected to the first plate 11 and the second plate 12 through fixing devices. The colorless transparent double-layer corrosion box 20 can be clamped between the four steel columns, and the outer walls of the four steel columns can be provided with a limiting structure to form an axial limit for the colorless transparent double-layer corrosion box 20. It can be understood that the four steel columns are distributed along the circumference of the colorless and transparent double-layer corrosion box 20, and will not occupy or obstruct the spatial structure of the colorless and transparent double-layer corrosion box 20 along the axial direction, which facilitates the arrangement of the test piece 30 such as an anchor rod or anchor cable along the axial direction of the colorless and transparent double-layer corrosion box 20. In some embodiments, the first plate body 11 and the second plate body 12 can be fixed to the support frame 16 or the test bench respectively.

[0028] Optionally, in one embodiment of the present application, the first plate 11 is provided with a first clamp 14, and the test piece 30 is inserted through and can be clamped by the first clamp 14; the second plate 12 is provided with a second clamp 15, and the test piece 30 is inserted through and can be clamped by the second clamp 15. For example, the first clamp 14 can be provided in the middle of the first plate 11, and the second clamp 15 can be provided in the middle of the second plate 12. The test piece 30 is inserted through the first clamp 14 and the second clamp 15 to form a clamping effect on the test piece 30, ensuring that the force loader 40 can stably apply tensile stress and shear stress to the test piece 30.

[0029] Optionally, in one embodiment of the present application, the force loader 40 includes a tensile stress loader 41, which is disposed on one side of the fixture 10 and is used to apply tension to the test piece 30 passing through the tensile stress loader 41. In this embodiment, the tensile stress loader 41 is disposed on the side of the second plate 12 away from the colorless transparent double-layer corrosion box 20, and the test piece 30 can pass through the tensile stress loader 41. The magnitude of the tensile force applied by the tensile stress loader 41 to the test piece 30 is adjustable. By applying a preset tensile force through the tensile stress loader 41, the portion of the test piece 30 located in the accommodating cavity of the colorless transparent double-layer corrosion box 20 is subjected to tensile stress, thereby allowing the observation of the influence of the corrosive environment on the test piece 30 under the tensile stress. It can be seen that this embodiment simulates the tensile stress conditions of the test piece 30, such as anchor rods and cables, in an actual working environment through the tensile stress loader 41.

[0030] Optionally, in one embodiment of the present application, the force loader 40 includes a shear stress loader 42, and the shear structure of the shear stress loader 42 extends into the accommodating cavity of the colorless and transparent double-layered corrosion chamber 20 to apply a shear force to the test piece 30. In this embodiment, the shear structure of the shear stress loader 42 extends into the accommodating cavity of the colorless and transparent double-layered corrosion chamber 20, and the magnitude of the shear force applied by the shear stress loader 42 to the test piece 30 is adjustable. Under the action of the shear drive mechanism 423 of the shear stress loader 42, the shear structure can apply a shear force of a preset magnitude to the portion of the test piece 30 located within the accommodating cavity of the colorless and transparent double-layered corrosion chamber 20, thereby allowing observation of the influence of the corrosive environment on the test piece 30 under the action of the shear stress. Specifically, the shear structure may include a first shear arm 421 and a second shear arm 422. The first shear arm 421 is inserted into the accommodating cavity from one side of the colorless transparent double-layer corrosion box 20, and the second shear arm 422 is inserted into the accommodating cavity from the opposite side, so as to apply a shear force to the portion of the test piece 30 located in the accommodating cavity of the colorless transparent double-layer corrosion box 20. Seals may be provided between the shear structure of the shear stress loader 42 and the wall of the colorless transparent double-layer corrosion box 20. For example, seals may be provided at the locations where the first shear arm 421 and the second shear arm 422 penetrate the wall of the colorless transparent double-layer corrosion box 20, so as to ensure the sealing of the accommodating cavity of the colorless transparent double-layer corrosion box 20. It can be seen that this embodiment simulates the shear stress conditions of the test piece 30, such as anchor rods and cables, in an actual working environment through the shear stress loader 42.

[0031] Optionally, in one embodiment of the present application, Figure 2 As shown, the wall of the colorless transparent double-layer corrosion box 20 is a transparent double-layer structure. A transparent heating liquid 21 is injected between the transparent double-layer structures. A heater 22 is also provided between the transparent double-layer structures of the colorless transparent double-layer corrosion box 20 for heating the heating liquid 21. The heater 22 of this embodiment is a heating coil disposed between the transparent double-layer structures of the box wall. A wire 24 equipped with a plug 23 can be connected to the heating coil. Under the action of a temperature controller 25, the heater 22 is heated and the temperature is controlled. The heat transfer from the heating liquid 21 between the transparent double-layer structures allows the temperature within the accommodating cavity of the colorless transparent double-layer corrosion box 20 to reach a preset temperature. The heating liquid 21 can be a colorless, transparent liquid with high thermal conductivity. It can be seen that this embodiment simulates the temperature conditions to which the test piece 30, such as an anchor rod and cable, would be subjected in an actual working environment.

[0032] Optionally, in one embodiment of the present application, the corrosive liquid pipeline includes a corrosive liquid tank 263, a first tube body 261, and an infusion pump 264; the box wall of the colorless transparent double-layer corrosion box 20 is further provided with a first through hole 260, and the corrosive liquid tank 263 is connected to the infusion pump 264 through the first tube body 261, so as to be used for introducing the corrosive liquid into the accommodating cavity of the colorless transparent double-layer corrosion box 20 through the first tube body 261, and the accommodating cavity of the colorless transparent double-layer corrosion box 20 is further provided with a nozzle 262 capable of being communicated with the first tube body 261, so as to provide the colorless transparent double-layer corrosion box 20 with corrosive liquid and simulate the mine water sprinkling environment; in this embodiment, one end of the first tube body 261 can be connected to the The first through hole 260 on the box wall of the colorless and transparent double-layer corrosion box 20 is connected, and the other end of the first tube body 261 can be connected to the corrosion liquid tank 263. The corrosion liquid tank 263 is configured with a corrosion liquid of a preset concentration. Under the action of the infusion pump 264, the corrosion liquid can pass from the corrosion liquid tank 263 through the first tube body 261 and enter the colorless and transparent double-layer corrosion box 20 through the first through hole 260. Under the action of the nozzle 262, the corrosion liquid is sprayed into the accommodating cavity of the colorless and transparent double-layer corrosion box 20 to corrode the part of the test piece 30 located in the accommodating cavity, thereby simulating the coal mine water spraying environment that the test piece 30 such as the anchor rod and anchor cable is subjected to in the actual working environment.

[0033] The and / or corrosive gas pipeline includes a corrosive gas tank 272, a second tube 271, and an air pump 273; the wall of the colorless transparent double-layered corrosion box 20 is further provided with a second through hole 270, and the corrosive gas tank 272 is connected to the air pump 273 through the second tube 271, so as to introduce the corrosive gas into the accommodating cavity of the colorless transparent double-layered corrosion box 20 through the second tube 271, so as to supply the colorless transparent double-layered corrosion box 20 with corrosive gas and simulate the corrosion atmosphere of the mine; in this embodiment, one end of the second tube 271 is connected to the colorless transparent double-layered corrosion box 20. The second through hole 270 in the wall of the double-layer corrosion chamber 20 is connected to the other end of the second tube 271, which is connected to a corrosion gas tank 272. The corrosion gas tank 272 contains a predetermined composition of corrosion gas. Under the action of a gas pump 273, the corrosion gas flows from the corrosion gas tank 272 through the second tube 271 and into the colorless, transparent double-layer corrosion chamber 20 through the second through hole 270. The corrosion gas then corrodes the portion of the test object 30 located within the receiving chamber, thereby simulating the gas corrosion environment to which the test object 30, such as an anchor rod or cable, would be exposed in an actual working environment. After the test, the residual corrosion gas in the receiving chamber is pumped back into the corrosion gas tank 272 through the second tube 271 by the gas pump 273 to prevent environmental contamination.

[0034] And / or the box wall of the colorless transparent double-layer corrosion box 20 is further provided with a third through hole 280, which is used to discharge the corrosion liquid in the receiving chamber of the colorless transparent double-layer corrosion box 20 through the third tube body 281; in this embodiment, after the test is completed, the valve 282 configured on the third tube body 281 can be opened to guide the residual corrosion liquid in the receiving chamber into the waste liquid tank 283 through the third tube body 281 to avoid polluting the environment.

[0035] Optionally, in one embodiment of the present application, an electrochemical measuring instrument 50 is further included. The electrochemical measuring instrument 50 is configured with a first electrode 51, a second electrode 52 and a third electrode 53. The first measuring point of the first electrode 51 is set on the test piece 30 and the first measuring point is located outside the accommodating cavity of the colorless transparent double-layer corrosion box 20. The second measuring point of the second electrode 52 and the third measuring point of the third electrode 53 are respectively set in the accommodating cavity of the colorless transparent double-layer corrosion box 20, so as to collect the electrical signal of the test piece 30 during the corrosion process after the corrosion liquid is introduced into the accommodating cavity of the colorless transparent double-layer corrosion box 20; wherein, the box wall of the colorless transparent double-layer corrosion box 20 is also provided with a fourth through hole 290 for passing the second electrode 52 and the third electrode 53. In this embodiment, the test piece 30, such as an anchor rod or cable, is often made of conductive metal. Therefore, an electrochemical tester is used to collect electrical signals, such as corrosion current density, from the test piece 30. Based on this data, the corrosion characteristics of the test piece 30 can be analyzed, thereby providing guidance for experimental conclusions and practical applications based on electrochemical principles. Specifically, the first electrode 51 can be a working electrode, the second electrode 52 can be a reference electrode, and the third electrode 53 can be an auxiliary electrode. In this way, the potential is the potential difference between the working electrode and the reference electrode, and the current can be directly measured through the working electrode and auxiliary electrode circuit. The first measuring point of the first electrode 51 is located at a portion of the DUT 30 outside the receiving chamber of the colorless, transparent double-layer etching chamber 20. The second measuring point of the second electrode 52 and the third measuring point of the third electrode 53 are located within the receiving chamber of the colorless, transparent double-layer etching chamber 20. A fourth through hole 290 is formed in the wall of the colorless, transparent double-layer etching chamber 20 and sealed with a sealing structure, such as cement, to insert the second and third electrodes 52, 53 into the receiving chamber of the colorless, transparent double-layer etching chamber 20 and establish the second and third measuring points. After etching liquid is introduced into the receiving chamber of the colorless, transparent double-layer etching chamber 20, the second and third measuring points are located within the etching liquid, allowing the first electrode 51 to form a voltage circuit and a current circuit with the second and third electrodes 52, 53, respectively, to collect electrical signals from the DUT 30 during the etching process.

[0036] Optionally, in one embodiment of the present application, an acoustic measuring instrument 60 is further included. The acoustic measuring instrument 60 is configured with an acoustic signal acquisition cable 61. The acoustic signal acquisition cable 61 is used to connect to the acoustic signal measurement point 62 of the test piece 30. Since the structure or physical characteristics of the test piece 30 will change during the stress corrosion process, and cracks will be generated under the action of tensile stress and shear stress, thereby generating acoustic signals, this embodiment uses the acoustic measuring instrument 60 to collect the acoustic signal of the test piece 30. The acoustic signal measurement point 62 is set on the test piece 30 between the colorless and transparent double-layer corrosion box 20 and the second fixture 15 to analyze the acoustic changes of the test piece 30 caused by stress corrosion, thereby further providing guidance for experimental analysis based on acoustic principles.

[0037] And / or further includes a camera 70, which is used to capture the corrosion changes of the test piece 30. The camera 70 can capture the portion of the test piece 30 located within the accommodating cavity of the colorless and transparent double-layer corrosion chamber 20, collecting image data during the test process to facilitate retrospective observation of the corrosion changes of the test piece 30.

[0038] In this embodiment, the components or structures of the corrosion testing system 100 that are in direct contact with the corrosive liquid or corrosive gas are all made of corrosion-resistant materials to increase the service life of the corrosion testing system 100 .

[0039] In summary, the present application ingeniously applies the tensile stress loader 41 and the shear stress loader 42 to the corrosion test of the anchor bolt and cable of the test piece 30 at the same time, which can simulate the multi-directional alternating stress state of the anchor bolt and cable in the coal mine; the transparent double-layer structure of the colorless transparent double-layer corrosion box 20 set in the present application is injected with heating liquid between the transparent double-layer structure, which can heat and simulate the high temperature of the coal mine, and uses the first tube body 261 as the corrosion liquid pipeline to simulate the water corrosion environment of the anchor bolt and cable in the coal mine with the nozzle 262, and uses the second tube body 271 as the corrosion gas pipeline to simulate the atmospheric corrosion environment of the coal mine. environment, and improve the simulation of the underground environment of coal mines; the colorless transparent double-layer corrosion box 20 set in this application is a colorless transparent double-layer structure and is injected with a colorless transparent heating liquid, which is convenient for observation during the test and using a camera 70 to record the corrosion process and changes of the test piece 30 in the colorless transparent double-layer corrosion box 20 in real time. The electrochemical measuring instrument 50 is set to measure and record the corrosion electrical signal of the test piece 30 in real time during the corrosion test, and the acoustic measuring instrument 60 is set to measure the acoustic signal of the test piece 30 in real time, so as to understand the corrosion rate and increase the monitoring dimension.

[0040] On the second aspect, the embodiments of the present application also provide a method for stress corrosion testing of anchor rods and anchor cables under shear loading and temperature control, which can effectively improve the degree of realism of environmental simulation of anchor rod and anchor cable corrosion testing.

[0041] The anchor bolt and anchor cable shear load temperature control stress corrosion test method provided in the embodiment of the present application may include: S1 , pass the test piece 30 through the accommodating cavity of the colorless transparent double-layer corrosion box 20 , connect the test piece 30 and the colorless transparent double-layer corrosion box 20 to the fixture 10 , and install the force loader 40 .

[0042] The test piece 30 is passed through the accommodating cavity of the colorless and transparent double-layer corrosion box 20, and the two ends of the test piece 30 are respectively passed through the first clamp 14 and the second clamp 15, and one end of the test piece 30 is passed through the tensile stress loader 41, and the shear structure of the shear stress loader 42 extends into the accommodating cavity of the colorless and transparent double-layer corrosion box 20; wherein the test piece 30 is an anchor rod or an anchor cable, the first clamp 14 is set on the first plate 11 of the fixture 10, and the second clamp 15 is set on the second plate 12 of the fixture 10, and the colorless and transparent double-layer corrosion box 20 is fixed to the frame 13 of the fixture 10, and the frame 13 is connected between the first plate 11 and the second plate 12, and the force loader 40 may include a tensile stress loader 41 and a shear stress loader 42. wherein the tensile stress loader 41 is set on one side of the fixture 10, and the shear structure of the shear stress loader 42 extends into the accommodating cavity of the colorless and transparent double-layer corrosion box 20.

[0043] S2. Connect the colorless and transparent double-layer corrosion box 20 to the corrosion liquid tank 263, the corrosion gas tank 272, and the waste liquid tank 283 respectively.

[0044] One end of the first tube body 261 can be connected to the first through hole 260 on the box wall of the colorless transparent double-layer corrosion box 20, and the other end of the first tube body 261 is connected to the corrosion liquid tank 263. The accommodating cavity of the colorless transparent double-layer corrosion box 20 is provided with a nozzle 262 that can be communicated with the first tube body 261; one end of the second tube body 271 is connected to the second through hole 270 on the box wall of the colorless transparent double-layer corrosion box 20, and the other end of the second tube body 271 is connected to the corrosion gas tank 272; one end of the third tube body 281 is connected to the third through hole 280 on the box wall of the colorless transparent double-layer corrosion box 20, and the other end of the third tube body 281 is connected to the waste liquid tank 283.

[0045] S3. Check and confirm the sealing of the colorless transparent double-layer corrosion box 20. In this step, it is necessary to ensure the sealing effect of the seal provided at the location where the test piece 30 is inserted into the colorless transparent double-layer corrosion box 20, the sealing effect of the seal provided at the location where the shear structure of the shear stress loader 42 extends into the accommodating cavity of the colorless transparent double-layer corrosion box 20, and the sealing effect of the connection between the colorless transparent double-layer corrosion box 20 and the first tube body 261, the second tube body 271, and the third tube body 281. The sealing effect of the colorless transparent double-layer corrosion box 20 is ensured by sealing the holes with seals or waterproof putty. S4. Heat the colorless transparent double-layer corrosion box 20, inject corrosive gas into the accommodating cavity of the colorless transparent double-layer corrosion box 20, and spray corrosive liquid into the accommodating cavity of the colorless transparent double-layer corrosion box 20.

[0046] The heater 22 provided on the wall of the colorless transparent double-layer corrosion box 20 is used to heat the heating liquid 21 between the transparent double-layer structure of the wall of the colorless transparent double-layer corrosion box 20, and the temperature in the receiving chamber of the colorless transparent double-layer corrosion box 20 is controlled at a preset temperature through the temperature controller 25; after the corrosive gas is injected into the receiving chamber of the colorless transparent double-layer corrosion box 20 through the second tube body 271, the corrosive liquid is sprayed into the receiving chamber of the colorless transparent double-layer corrosion box 20 through the first tube body 261 and the nozzle 262, so that the part of the test piece 30 located in the receiving chamber is spray-corroded.

[0047] S5. Use the electrochemical measuring instrument 50 to collect the electrical signal of the test piece 30, use the acoustic measuring instrument 60 to collect the acoustic signal of the test piece 30, and use the camera 70 to shoot the corrosion changes of the test piece 30 in the colorless and transparent double-layer corrosion box 20.

[0048] The electrochemical measuring instrument 50 can be configured with a first electrode 51, a second electrode 52 and a third electrode 53. The first electrode 51 can be a working electrode, the second electrode 52 can be a reference electrode, and the third electrode 53 can be an auxiliary electrode. The first measuring point of the first electrode 51 is set at a position where the test piece 30 is located outside the accommodating cavity of the colorless transparent double-layer corrosion box 20, the second measuring point of the second electrode 52, and the third measuring point of the third electrode are set in the accommodating cavity of the colorless transparent double-layer corrosion box 20. After the corrosive liquid is introduced into the accommodating cavity of the colorless transparent double-layer corrosion box 20, the second measuring point and the third measuring point are located in the corrosive liquid, so that the first electrode 51 and the second electrode 52 and the third electrode 53 can form a voltage loop and a current loop respectively, so as to collect the electrical signal of the test piece 30 during the corrosion process.

[0049] One end of the acoustic signal acquisition cable 61 of the acoustic measuring instrument 60 is connected to the acoustic signal measurement point 62 of the test piece 30, and the acoustic measuring instrument 60 is used to collect the acoustic signal of the corrosion fracture failure of the test piece 30; and the camera 70 is used to shoot the corrosion changes of the test piece 30 in the colorless and transparent double-layer corrosion box 20.

[0050] S6. Apply tensile stress and shear stress to the test piece 30 using the force loader 40. In this embodiment, the tensile stress loader 41 applies a preset tensile stress to the test piece 30 along the axial direction, and the shear stress loader 42 applies a preset shear stress to the corresponding position of the test piece 30 within the accommodating chamber of the colorless and transparent double-layer corrosion chamber 20.

[0051] S7. After the stress corrosion failure occurs in the test piece 30, the test is stopped and the corrosive gas and corrosive liquid in the accommodating cavity of the colorless and transparent double-layer corrosion box 20 are discharged.

[0052] When stress corrosion failure occurs in the test piece 30, the tensile stress loader 41, the shear stress loader 42, and the heater 22 are turned off, and the spraying of the corrosive liquid into the containing cavity of the colorless transparent double-layer corrosion box 20 is stopped; then, the corrosive gas in the containing cavity of the colorless transparent double-layer corrosion box 20 is drawn into the corrosive gas tank 272 by the second tube 271, and the corrosive liquid in the containing cavity of the colorless transparent double-layer corrosion box 20 is discharged to the waste liquid tank 283 by the third tube 281, and the electrochemical measuring instrument 50, the acoustic measuring instrument 60, and the camera 70 are turned off.

[0053] S8. Remove the test piece 30, observe, record, and photograph the failure conditions of the test piece 30, and analyze the stress corrosion test results. For example, the stress corrosion test results can be analyzed by observing the fracture characteristics of the test piece 30 and combining them with the electrical signals collected by the electrochemical measuring instrument 50 and the acoustic signals collected by the acoustic measuring instrument 60.

[0054] The embodiment of the present application provides a method for stress corrosion testing anchor rods and cables under shear loading and temperature control. The corrosion testing system 100 used includes: a fixture 10, a colorless and transparent double-layer corrosion box 20, a test piece 30, a corrosive liquid pipeline, a corrosive gas pipeline, and a force loader 40; the colorless and transparent double-layer corrosion box 20 is connected between the fixtures and has a accommodating cavity for observing the internal conditions. The corrosive liquid pipeline and the corrosive gas pipeline spray corrosive liquid and corrosive gas on the test piece 30 to simulate a corrosive environment; the test piece 30 passes through the accommodating cavity of the colorless and transparent double-layer corrosion box 20, and both ends of the test piece 30 are connected to the fixture 10, wherein the test piece 30 is an anchor rod or anchor cable; the force loader 40 is used to apply tensile stress and shear stress to a preset position of the test piece 30. This system can effectively improve the degree of realism of environmental simulation for stress corrosion testing of anchor rods and cables.

[0055] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the two are connected to each other and the relative position relationship after connection remains unchanged. The directional terms mentioned in the embodiments of the present application, such as "upper", "lower", "inside", "outside", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present application, 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 understood as a limitation on the embodiments of the present application. "Multiple" means at least two.

[0056] In the embodiments of this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first," "second," "third," or "fourth" may explicitly or implicitly include one or more of the features.

[0057] In the embodiments of this application, "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0058] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in some other embodiments," and "in another embodiment" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0059] The above content has briefly described the embodiments of the present application in detail. Those skilled in the art can design and modify the device and its usage within the scope of the present application according to the on-site construction conditions.

[0060] Each embodiment in this specification is described in a related manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0061] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An anchor bolt and cable shear load temperature control stress corrosion test system, characterized in that: include: Fixer; A colorless and transparent double-layer corrosion box, which is connected between the fixtures and has a receiving cavity for observing the internal conditions; A test piece, the test piece passes through the accommodating cavity of the colorless and transparent double-layer corrosion box, and both ends of the test piece are connected to the fixture, wherein the test piece is an anchor rod or an anchor cable; A corrosive liquid pipeline and a corrosive gas pipeline, wherein the corrosive liquid pipeline and the corrosive gas pipeline are used to simulate a corrosive environment; A force loader, the force loader including a tensile stress loader and a shear stress loader, for applying tensile stress and shear stress to a preset position of the test piece; an acoustic measuring instrument, the acoustic measuring instrument being equipped with an acoustic signal acquisition cable, the acoustic signal acquisition cable being used to connect to an acoustic signal measurement point of the test piece; A camera is used to photograph the corrosion changes of the tested component.

2. The anchor bolt and cable tension and shear load temperature control stress corrosion testing system according to claim 1 is characterized in that: The fixer includes a first plate, a second plate, and a frame. The frame is connected between the first plate and the second plate, and the colorless and transparent double-layer corrosion box is fixed to the frame.

3. The anchor bolt and cable shear load temperature control stress corrosion test system according to claim 2, characterized in that: The first plate is provided with a first fixture, and the test piece is passed through the first fixture and can be clamped by the first fixture; The second plate body is provided with a second clamp, and the measured object is passed through the second clamp and can be clamped by the second clamp.

4. The anchor bolt and cable tension and shear load temperature control stress corrosion testing system according to claim 3 is characterized in that: The tensile stress loader is arranged on one side of the fixture and is used to apply tension to the test piece passing through the tensile stress loader.

5. The anchor bolt and cable tension and shear load temperature control stress corrosion testing system according to claim 4, characterized in that: The shearing structure of the shear stress loader extends into the accommodating cavity of the colorless and transparent double-layer corrosion box to apply shearing force to the test piece.

6. The anchor bolt and cable tension and shear load temperature control stress corrosion testing system according to claim 5, characterized in that: The wall of the colorless transparent double-layer etching box is a transparent double-layer structure, transparent heating liquid is injected between the transparent double-layer structures, and a heater is also provided between the transparent double-layer structures of the colorless transparent double-layer etching box to heat the heating liquid.

7. The anchor bolt and cable tension and shear load temperature control stress corrosion testing system according to claim 6, characterized in that: The corrosive liquid pipeline includes a corrosive liquid tank, a first tube body, and an infusion pump; the box wall of the colorless transparent double-layered corrosion box is further provided with a first through hole, the corrosive liquid tank is connected to the infusion pump through the first tube body, so as to be used for introducing the corrosive liquid into the accommodating cavity of the colorless transparent double-layered corrosion box through the first tube body; the accommodating cavity of the colorless transparent double-layered corrosion box is further provided with a nozzle capable of communicating with the first tube body, so as to provide the colorless transparent double-layered corrosion box with corrosive liquid and simulate the mine water sprinkling environment; and / or The corrosive gas pipeline includes a corrosive gas tank, a second tube body, and an air pump; the wall of the colorless and transparent double-layered corrosion box is further provided with a second through hole, and the corrosive gas tank is connected to the air pump via the second tube body, so as to introduce the corrosive gas into the accommodating cavity of the colorless and transparent double-layered corrosion box through the second tube body, so as to supply the colorless and transparent double-layered corrosion box with corrosive gas and simulate the corrosive atmosphere environment of a mine; and / or The box wall of the colorless transparent double-layer corrosion box is further provided with a third through hole for guiding the corrosion liquid in the accommodating cavity of the colorless transparent double-layer corrosion box through the third tube body.

8. The anchor bolt and cable tension and shear load temperature control stress corrosion testing system according to claim 7, characterized in that: The apparatus further includes an electrochemical measuring instrument, the electrochemical measuring instrument being configured with a first electrode, a second electrode, and a third electrode, wherein a first measuring point of the first electrode is disposed on the test piece and is located outside the accommodating cavity of the colorless transparent double-layer etching box, and a second measuring point of the second electrode and a third measuring point of the third electrode are respectively disposed within the accommodating cavity of the colorless transparent double-layer etching box, so as to collect electrical signals of the test piece during the etching process after etching liquid is introduced into the accommodating cavity of the colorless transparent double-layer etching box; Wherein, the box wall of the colorless and transparent double-layer etching box is further provided with a fourth through hole for passing the second electrode and the third electrode.

9. A stress corrosion test method for anchor rods and cables under shear loading and temperature control, characterized in that: include: Pass the test piece through the accommodating cavity of the colorless transparent double-layer corrosion box, connect the test piece and the colorless transparent double-layer corrosion box to a fixture, and install a force loader; Connecting the colorless and transparent double-layer corrosion box to the corrosion liquid tank, the corrosion gas tank, and the waste liquid tank respectively; Check and confirm the sealing of the colorless and transparent double-layer corrosion box; heating the colorless transparent double-layer etching box, injecting etching gas into the accommodating cavity of the colorless transparent double-layer etching box, and spraying etching liquid into the accommodating cavity of the colorless transparent double-layer etching box; Using an electrochemical measuring instrument to collect the electrical signal of the test piece, using an acoustic measuring instrument to collect the acoustic signal of the test piece, and using a camera to capture the corrosion changes of the test piece in a colorless and transparent double-layer corrosion box; applying tensile stress and shear stress to the test piece by using the force loader; After the tested piece fails due to stress corrosion, the test is stopped, and the corrosive gas and corrosive liquid in the accommodating cavity of the colorless and transparent double-layer corrosion box are discharged; The test piece is taken out, the failure condition of the test piece is observed, recorded and photographed, and the stress corrosion test results are analyzed.

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