A corrosion resistance strength testing device for high-strength PC steel bars

Abstract

The present invention provides a corrosion resistance strength testing device for high-strength PC steel bars, belonging to the technical field of steel bar strength testing. It includes a test bench and a controller, and also includes: a test mechanism; a dripping spray mechanism; a pressure regulating mechanism; a liquid pumping mechanism; and an air circulation mechanism. The present invention performs an acid-base corrosion test on the steel bar by using a hydrogen chloride solution and a sodium hydroxide solution. At the same time, the hydrogen chloride solution and the sodium hydroxide solution enter a collecting bucket and mix to form a sodium chloride solution. The sodium chloride solution will act on the top of the steel bar again under the action of the liquid pumping mechanism, simulating the corrosion test of the steel bar in a marine environment, and causing the temperature and pressure inside the test mechanism to rise. At this time, the dripping spray mechanism changes the liquid release state of the spray hole under the action of the air pressure and the pressure regulating mechanism, causing the spray hole to change from a dripping state to a spray state, thereby realizing the corrosion strength test of the steel bar in different release modes under different chemical reagents, and improving the test efficiency.

Description

Technical Field

[0001] The invention relates to the field of steel bar strength testing, and in particular to a corrosion resistance strength testing device for high-strength PC steel bars. Background Art

[0002] As an important building steel bar, the corrosion resistance of high-strength PC steel bar is extremely critical to ensure the long-term stability of engineering structures. The corrosion strength test of PC steel bar usually includes two methods: laboratory test and field test, which aims to evaluate the corrosion resistance and service life of PC steel bar in various corrosive environments. Laboratory test usually adopts standardized test methods, such as GB / T 41951-2022 "Corrosion of metals and alloys - Test method for corrosion resistance of steel connection parts and steel components for construction". This method is suitable for corrosion performance testing of steel connection parts and steel components for construction in chloride ion environment, including periodic spray test method and periodic salt spray test method. Periodic spray test method: Sample preparation: Select representative samples and perform necessary grinding and cleaning. Test condition setting: Determine the test temperature, test liquid composition and test time, etc. Test operation: Immerse the sample completely in the corrosive liquid for a certain period of time. Sample evaluation: Evaluate the corrosion performance by observing the appearance changes of the sample and measuring indicators such as weight loss. Data analysis: According to the experimental results, data analysis and statistics are carried out to obtain corrosion performance indicators. Periodic salt spray test method: Sample preparation: Same as the periodic spray test method. Test condition setting: Set the salt spray deposition rate, test cycle, etc. Test operation: Place the sample in a salt spray environment to simulate its use conditions in the ocean or industrial atmosphere. Sample evaluation: Observe the corrosion of the sample in the salt spray environment and evaluate its corrosion resistance. Data analysis: Same as the periodic spray test method.

[0003] At present, when conducting application strength tests on high-strength PC steel bars, it is necessary to intercept multiple high-strength PC steel bars to be tested for drip and spray tests respectively. In addition, different reagents are required for the drip and spray tests. It is impossible to intercept only one section and conduct drip and spray tests with multiple reagents at the same time, which increases the labor burden of testers, affects the efficiency of application strength tests on high-strength PC steel bars, and causes waste of resources.

[0004] How to invent a corrosion resistance strength testing device for high-strength PC steel bars to solve these problems has become an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0005] In order to make up for the above shortcomings, the present invention provides a corrosion resistance strength testing device for high-strength PC steel bars, which aims to solve the problem that it is impossible to simultaneously perform drip and spray tests of multiple reagents on a section of high-strength PC steel bars.

[0006] The present invention is achieved in that:

[0007] The present invention provides a corrosion resistance strength testing device for a high-strength PC steel bar, comprising a test bench and a controller, and further comprising:

[0008] A testing mechanism, which is installed on the top of the test bench and is used to divide the plane of the high-strength PC steel bar to be tested into five testing parts;

[0009] A drip spray mechanism, the drip spray mechanism is installed in the test mechanism, and the drip spray mechanism is used to change the injection mode of the reagent according to the change of the air pressure inside the test mechanism;

[0010] A pressure regulating mechanism, which is installed on the top of the drip spray mechanism and is used to change the air pressure inside the test mechanism and change the oxygen content inside the test mechanism;

[0011] A liquid extraction mechanism, wherein the liquid extraction mechanism is installed on the top of the testing mechanism;

[0012] An air circulation mechanism is installed in a testing mechanism and is used to test the strength of a high-strength PC steel rod in a humid environment.

[0013] Preferably, the five test sections are two marine environment simulation test sections, one acidic environment simulation test section, one alkaline environment simulation test section and one humid environment simulation test section.

[0014] Preferably, the testing mechanism comprises a cylinder mounted on the top of the testing table, the output end of the cylinder is fixedly connected to an upper testing plate, and an isolation frame is fixedly connected inside the upper testing plate.

[0015] Among them, the top of the test bench is fixedly connected to a lower test plate, the lower test plate is fixedly connected to a support bracket, the bottom of the support bracket is fixedly connected to a filter, the bottom of the lower test plate is fixedly connected to a collecting bucket, the top of the filter is fixedly connected to a telescopic rod, the telescopic rod is fixedly connected to a first spring, the upper test plate and the lower test plate are adapted to each other, the filter is fixedly connected in the lower test plate, and the first spring is fixedly connected to the top of the filter.

[0016] Preferably, the top of the upper test tray is fixedly connected to an acid liquid tank, the bottom of the acid liquid tank is fixedly connected to an acid liquid injection pipe, the top of the upper test tray is fixedly connected to an alkali liquid tank, the bottom of the alkali liquid tank is fixedly connected to an alkali liquid injection pipe, and the tops of the acid liquid tank and the alkali liquid tank are both fixedly connected to liquid adding pipes.

[0017] Preferably, the drip spray mechanism includes a pressure regulating plate slidably connected to the upper test disk, the top of the pressure regulating plate is fixedly connected to two transfer boxes, the tops of the two transfer boxes are fixedly connected to bellows, a spray hole is opened on the pressure regulating plate, the spray hole is arranged in the transfer box, an air injection hole is opened on the top of the transfer box, a camera is installed on the bottom of the pressure regulating plate, an air inlet is opened on the top of the upper test disk, and the pressure regulating plate is slidably connected to the isolation frame.

[0018] Preferably, one of the bellows is connected to the acid solution injection pipe, and the other bellows is connected to the alkali solution injection pipe.

[0019] Preferably, the pressure regulating mechanism includes a connecting pipe fixedly connected to the top of the pressure regulating plate, the connecting pipe is slidably connected to the exhaust pipe, a fixing rod is fixedly connected inside the connecting pipe, a sealing block is fixedly connected to the top of the fixing rod, a connecting plate is fixedly connected to the top of the sealing block, a sealing plate is fixedly connected to the end of the connecting plate, the exhaust pipe is fixedly connected to the top of the upper test disk, the sealing block is adapted to the exhaust pipe, and a second spring is fixedly connected to the bottom of the connecting plate, and the second spring is fixedly connected to the top of the upper test disk.

[0020] Preferably, the liquid extraction mechanism includes a motor installed on the top of the acid liquid tank and the alkali liquid tank through a mounting plate, the output end of the motor is fixedly connected to a rotating shaft, a reciprocating plate is threadedly connected to the rotating shaft, and the bottoms of both ends of the reciprocating plate are fixedly connected to piston plates, wherein the top of the upper test disk is fixedly connected to a piston cylinder, the side wall of the piston cylinder is fixedly connected to a liquid extraction tube, and the piston plate is adapted to the piston cylinder.

[0021] Preferably, one end of the liquid extraction tube away from the piston cylinder is connected to the collecting bucket, the bottom of the piston cylinder is connected to the top of the bellows, and the liquid extraction tube is configured as a hose.

[0022] Preferably, the air circulation mechanism includes an air pump fixedly connected to the middle part of the upper test plate, a fan blade is installed in the air pump, and an air pump pipe is fixedly connected to the side wall of the air pump, wherein the outer wall of the lower test plate is fixedly connected to the air pump ring, the side wall of the lower test plate is provided with an air pump hole, the air pump hole is communicated with the air pump ring, the isolation frame is provided with an exhaust hole, the fan blade is fixedly connected to the rotating shaft, the sealing plate is fitted with the top of the air pump, and the end of the air pump pipe away from the air pump is fixedly connected to the air pump ring.

[0023] The beneficial effects of the present invention are:

[0024] The present invention performs an acid-base corrosion test on a steel rod by using a hydrogen chloride solution and a sodium hydroxide solution. At the same time, the hydrogen chloride solution and the sodium hydroxide solution enter a collecting bucket and mix to form a sodium chloride solution. The sodium chloride solution will act on the top of the steel rod again under the action of a liquid pumping mechanism, simulating a corrosion test of the steel rod in an ocean environment, and increasing the temperature and pressure inside the testing mechanism. At this time, the drip spray mechanism changes the liquid release state of the spray hole under the action of an air pressure and a pressure regulating mechanism, so that the spray hole changes from a dripping state to a spraying state, thereby realizing the corrosion strength test of the steel rod in different release modes under different chemical reagents, and improving the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of a corrosion resistance strength testing device for high-strength PC steel bars provided in an embodiment of the present invention;

[0027] Figure 2 It is a schematic diagram of a three-dimensional partially cutaway structure of a corrosion resistance strength testing device for a high-strength PC steel bar provided by an embodiment of the present invention;

[0028] Figure 3 It is a schematic diagram of the front middle section structure of a corrosion resistance strength testing device for high-strength PC steel bars provided by an embodiment of the present invention;

[0029] Figure 4 It is a schematic diagram of a side middle section structure of a corrosion resistance strength testing device for a high-strength PC steel bar provided by an embodiment of the present invention;

[0030] Figure 5 A corrosion resistance strength testing device for high-strength PC steel bars provided in an embodiment of the present invention Figure 4 The enlarged structural diagram at A in the middle;

[0031] Figure 6 It is a three-dimensional partially cutaway bottom-up structural schematic diagram of a corrosion resistance strength testing device for a high-strength PC steel bar provided by an embodiment of the present invention;

[0032] Figure 7 It is a schematic diagram of the bottom structure of a test plate on a corrosion resistance strength test device for high-strength PC steel bars provided in an embodiment of the present invention;

[0033] Figure 8 It is a schematic diagram of the three-dimensional structure of a pressure regulating plate of a corrosion resistance strength testing device for high-strength PC steel bars provided in an embodiment of the present invention.

[0034] In the figure: 1, test bench; 2, controller; 3, cylinder; 31, upper test plate; 32, lower test plate; 33, support frame; 34, filter screen; 35, collection bucket; 36, isolation frame; 37, telescopic rod; 38, first spring; 4, acid tank; 5, acid injection pipe; 6, alkali tank; 7, alkali injection pipe; 8, pressure regulating plate; 81, transfer box; 82, bellows; 83, spray hole; 84, air inlet; 85, air injection hole; 86. Camera; 9. Connecting pipe; 91. Exhaust pipe; 92. Fixing rod; 93. Blocking block; 94. Connecting plate; 95. Sealing plate; 96. Second spring; 10. Motor; 101. Rotating shaft; 102. Reciprocating plate; 103. Piston plate; 104. Piston cylinder; 105. Liquid extraction pipe; 11. Vacuum pump; 111. Fan blade; 112. Vacuum extraction pipe; 113. Vacuum extraction ring; 114. Vacuum extraction hole; 115. Exhaust hole. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1: Reference Figure 1-Figure 7A corrosion resistance strength testing device for high-strength PC steel bars includes a test bench 1 and a controller 2, and also includes: a testing mechanism, the testing mechanism is installed on the top of the test bench 1, the testing mechanism is used to divide the plane of the high-strength PC steel bar to be tested into five testing parts, the five testing parts are two marine environment simulation testing parts, one acidic environment simulation testing part, one alkaline environment simulation testing part and a humid environment simulation testing part, the testing mechanism includes a cylinder 3 installed on the top of the test bench 1, the output end of the cylinder 3 is fixedly connected to an upper test disc 31, and the upper test disc 31 is fixedly connected to an isolation frame 36, wherein the top of the test bench 1 is fixedly connected to a lower test disc 32, the lower test disc 32 is fixedly connected to a support frame 33, the bottom of the support frame 33 is fixedly connected to a filter screen 34, and the bottom of the lower test disc 32 is fixedly connected to a collecting The top of the filter screen 34 is fixedly connected with a telescopic rod 37, and the telescopic rod 37 is fixedly connected with a first spring 38. The upper test disc 31 and the lower test disc 32 are adapted to each other. The filter screen 34 is fixedly connected in the lower test disc 32, and the first spring 38 is fixedly connected to the top of the filter screen 34. The five test parts are separated by an isolation frame 36. The top of the upper test disc 31 is fixedly connected with an acid liquid tank 4, and the acid liquid tank 4 is filled with hydrogen chloride solution. The bottom of the acid liquid tank 4 is fixedly connected with an acid liquid injection pipe 5. The top of the upper test disc 31 is fixedly connected with an alkali liquid tank 6, and the alkali liquid tank 6 is filled with sodium hydroxide solution. The bottom of the alkali liquid tank 6 is fixedly connected with an alkali liquid injection pipe 7. The tops of the acid liquid tank 4 and the alkali liquid tank 6 are fixedly connected with liquid adding pipes. The acid liquid injection pipe 5 and the alkali liquid injection pipe 7 are both equipped with electromagnetic valves, and the electromagnetic valves are controlled by the controller 2.

[0037] It should be noted that after the hydrogen chloride solution and the sodium hydroxide solution drip onto the steel rod, they will be filtered through the filter 34 and then enter the collecting hopper 35. At this time, the hydrogen chloride solution and the sodium hydroxide solution will mix to form a sodium chloride solution and generate heat at the same time. At this time, due to the assembly and sealing of the upper test tray 31 and the lower test tray 32, the air pressure in the space formed by the upper test tray 31 and the lower test tray 32 will increase, and the temperature will rise at the same time. However, the temperature will not be too high, and will be between 35-50°C, providing a relatively constant temperature environment for the corrosion test of the steel rod, preventing the increase in temperature from causing the strength of the metal to decrease, affecting the accuracy of the strength test, and at the same time making the steel rod test more stable. During the corrosion test, the pressure in the space formed by the upper test plate 31 and the lower test plate 32 increases. By increasing the pressure, the stress state in the actual project can be simulated under laboratory conditions, so as to more realistically evaluate the post-corrosion performance of the PC steel bar and improve the authenticity of the test; by increasing the pressure, the corrosion performance of the PC steel bar can be quickly evaluated in a shorter period of time, thereby improving the efficiency of research and development and quality control and shortening the test time; in prestressed concrete structures, the safety performance of PC steel bars is of vital importance. By increasing the pressure test, it can be ensured that the PC steel bars still have good mechanical properties and corrosion resistance under extreme conditions, ensuring the safety of the project and the safety performance of the steel bars.

[0038] Reference Figure 1 , Figure 2 , Figure 5-Figure 8 , a drip spray mechanism, which is installed in the test mechanism, and is used to change the injection method of the reagent according to the change of the internal air pressure of the test mechanism. The drip spray mechanism includes a pressure regulating plate 8 slidably connected to the upper test disk 31, and two transfer boxes 81 are fixedly connected to the top of the pressure regulating plate 8, and bellows 82 are fixedly connected to the top of the two transfer boxes 81. A spray hole 83 is opened on the pressure regulating plate 8, and the spray hole 83 is arranged in the transfer box 81. An air injection hole 85 is opened on the top of the transfer box 81. A camera 86 is installed at the bottom of the pressure regulating plate 8, and an air inlet 84 is opened on the top of the upper test disk 31. The pressure regulating plate 8 is slidably connected to the isolation frame 36, and one of the bellows 82 is connected to the acid injection pipe 5, and the other bellows 82 is connected to the alkali injection pipe 7.

[0039] It should be noted that a one-way valve is installed in the bellows 82, so that the liquid can only enter the transfer box 81 through the bellows 82, a one-way valve is provided in the air injection hole 85, so that the gas in the space formed by the top of the pressure regulating plate 8 and the interior of the upper test disk 31 can only enter the transfer box 81 through the air injection hole 85, and a one-way valve is provided in the air inlet 84, so that the space formed by the top of the pressure regulating plate 8 and the upper test disk 31 can only be drawn from the outside air through the air inlet 84;

[0040] When the air pressure in the space formed by the upper test disk 31 and the lower test disk 32 increases, the pressure regulating plate 8 will slide upward under the action of the air pressure, compressing the gas in the space formed by the top of the pressure regulating plate 8 and the upper test disk 31, so that the compressed gas enters the transfer box 81 through the gas injection hole 85. At this time, due to the presence of gas in the transfer box 81 and the need to exhaust, the reagent released by the spray hole 83 will change from a dripping state to an atomized state, thereby realizing a drip test and an atomization test on the steel rod. The drip test usually involves dripping a corrosive solution on the surface of the steel rod to simulate local corrosion. By observing the corrosion rate and degree at the dripping position, we can understand the corrosion resistance of the steel rod under that specific condition. The dripping test can help determine the durability of the steel rod in a specific environment (such as seawater, acidic solution and alkaline solution, etc.); the atomization test is to atomize the corrosive solution into small particles, and then let these particles evenly cover the surface of the steel rod to simulate the overall corrosion of the steel rod in a corrosive environment. The atomization test can more comprehensively evaluate the corrosion resistance of the steel rod in a corrosive atmosphere, expand the test scope of the steel rod, and make the test data more comprehensive.

[0041] Reference Figure 1-Figure 4 , the liquid pumping mechanism is installed on the top of the test mechanism, the liquid pumping mechanism includes a motor 10 installed on the top of the acid tank 4 and the alkali tank 6 through a mounting plate, the output end of the motor 10 is fixedly connected with a rotating shaft 101, and a reciprocating plate 102 is threadedly connected to the rotating shaft 101, and the bottoms of both ends of the reciprocating plate 102 are fixedly connected with piston plates 103, wherein, the top of the upper test disk 31 is fixedly connected with a piston cylinder 104, and the side wall of the piston cylinder 104 is fixedly connected with a liquid pumping tube 105, the piston plate 103 is adapted to the piston cylinder 104, and one end of the liquid pumping tube 105 away from the piston cylinder 104 is connected to the collecting bucket 35, the bottom of the piston cylinder 104 is connected to the top of the bellows 82, and the liquid pumping tube 105 is configured as a hose.

[0042] It should be noted that a one-way valve is provided in the liquid extraction tube 105, so that the piston cylinder 104 can only extract the liquid in the collecting bucket 35 through the liquid extraction tube 105, so that the sodium chloride solution formed by the hydrogen chloride solution of the sodium hydroxide solution can be released on the surface of the steel rod, simulating the use of the steel rod in the marine environment, and conducting a corrosion test on the use of the steel rod in the marine environment.

[0043] Reference Figure 1-Figure 3 , Figure 5-Figure 8, an air circulation mechanism, which is installed in the test mechanism, and is used to test the strength of high-strength PC steel rods in a humid environment. The air circulation mechanism includes an air pump 11 fixedly connected to the middle of the upper test disk 31, and a fan blade 111 is installed in the air pump 11. The side wall of the air pump 11 is fixedly connected to an air pumping pipe 112, wherein an air pumping ring 113 is fixedly connected to the outer wall of the lower test disk 32, and an air pumping hole 114 is opened on the side wall of the lower test disk 32, and the air pumping hole 114 is connected to the air pumping ring 113, and an exhaust hole 115 is opened on the isolation frame 36. The fan blade 111 is fixedly connected to the rotating shaft 101, and the end of the air pumping pipe 112 away from the air pump 11 is fixedly connected to the air pumping ring 113.

[0044] It should be noted that when the fan blades 111 are working, part of the evaporated water vapor in the sodium chloride solution formed by mixing the sodium hydroxide solution and the hydrogen chloride solution can be sucked into the vacuum cylinder 11, so that humid air is formed in the vacuum cylinder 11, thereby simulating the use of the steel rod in a humid environment, and performing a corrosion test on the steel rod in a humid environment. At the same time, due to the setting of the exhaust hole 115 and the vacuum cylinder 11, the moisture in the humid air can be reduced, preventing the presence of moisture from reducing the concentration of the acid and alkali reagents and affecting the test efficiency.

[0045] Working principle: When in use, the steel rod to be tested is placed above the support frame 33 in the lower test plate 32 and on the top of the telescopic rod 37. At this time, the cylinder 3 is started by the controller 2 so that the upper test plate 31 is covered on the lower test plate 32. At this time, due to the squeezing of the isolation frame 36 and the setting of the telescopic rod 37 and the first spring 38, the steel rod will be close to the bottom of the isolation frame 36. Then the opening and closing state of the solenoid valve and the opening and closing size can be changed by the controller 2, so that the hydrogen chloride solution in the acid tank 4 enters the transfer box 81 through the acid injection pipe 5 and the bellows 82, and the sodium hydroxide solution in the alkali tank 6 enters the transfer box 81 through the alkali injection pipe 7 and the bellows 82. Then the acid and alkali are released on the top of the steel rod through the spray hole 83. At this time, the liquid release state in the spray hole 83 is drip release;

[0046] At the same time, the motor 10 is started to rotate the shaft 101, and the acid-base reagent dripped on the top of the steel rod will flow through the steel rod and enter the collecting bucket 35 after being filtered by the filter screen 34. At this time, the hydrogen chloride solution and the sodium hydroxide solution are mixed and reacted to form a sodium chloride solution. Since the reaction of hydrogen chloride and sodium hydroxide is an exothermic reaction, the temperature in the space formed by the upper test disk 31 and the lower test disk 32 will rise, and water vapor will be formed at the same time. The rotation of the shaft 101 will cause the reciprocating plate 102 to drive the piston plate 103 to slide up and down in the piston cylinder 104, and the sodium chloride solution in the collecting bucket 35 will be sucked into the piston cylinder 104 through the liquid extraction pipe 105, and then the sodium chloride solution entering the piston cylinder 104 will enter the transfer box 81 through the bellows 82, and then pass through the spray hole 83 to perform a drip test in a simulated marine environment;

[0047] During this process, the rotation of the rotating shaft 101 will cause the fan blade 111 to rotate, so that the vacuum cylinder 11 extracts the humid air in the space formed by the upper test plate 31 and the lower test plate 32 through the vacuum pipe 112, the vacuum ring 113 and the vacuum hole 114, so that the humid air acts on the top of the steel rod, and the corrosion test of the steel rod in a simulated humid environment is performed;

[0048] At the same time, due to the entry of acid and alkali solution and the increase in temperature, the air pressure in the space formed by the upper test plate 31 and the lower test plate 32 will increase, causing the pressure regulating plate 8 to slide upward under the action of the air pressure. At this time, the gas in the space formed by the top of the pressure regulating plate 8 and the upper test plate 31 will enter the transfer box 81 through the air injection hole 85, so that the air is discharged through the spray hole 83. At this time, since the acid, alkali and sodium chloride solution are discharged through the spray hole 83 simultaneously, the liquid discharged from the spray hole 83 will be in an atomized state, realizing the drip test and atomization test of the steel rod. The drip test usually uses corrosion The corrosive solution is dropped on the surface of the steel rod to simulate the local corrosion situation; by observing the corrosion rate and degree of the drop position, the corrosion resistance of the steel rod under the specific conditions can be understood. The drop test can help determine the durability of the steel rod in a specific environment (such as seawater, acidic solution and alkaline solution, etc.); the atomization test is to atomize the corrosive solution into small particles, and then let these particles evenly cover the surface of the steel rod to simulate the overall corrosion of the steel rod in a corrosive environment. The atomization test can more comprehensively evaluate the corrosion resistance of the steel rod in a corrosive atmosphere, expand the test scope of the steel rod, and make the test data more comprehensive;

[0049] After the test is completed, the cylinder 3 is started by the controller 2 to move the upper test plate 31 away from the lower test plate 32, and the camera 86 is started at the same time, so that the camera 86 takes a picture of the surface of the steel rod, and then the steel rod can be removed. The pictures taken by the camera 86 include uncorroded parts, acid corrosion parts, alkaline corrosion parts, salt corrosion parts and humid environment corrosion parts. The corrosion conditions of the steel rod in different environments can be compared to determine in which environment the steel rod has good anti-corrosion performance, so that targeted improvements can be made to the steel rod.

[0050] Example 2: Reference Figure 5 , Figure 7 , Figure 8 , a pressure regulating mechanism, the pressure regulating mechanism is installed on the top of the drip spray mechanism, the pressure regulating mechanism is used to change the internal air pressure of the test mechanism and change the oxygen content inside the test mechanism, the pressure regulating mechanism includes a connecting pipe 9 fixedly connected to the top of the pressure regulating plate 8, the connecting pipe 9 is slidably connected with an exhaust pipe 91, a fixing rod 92 is fixedly connected in the connecting pipe 9, a blocking block 93 is fixedly connected to the top of the fixing rod 92, a connecting plate 94 is fixedly connected to the top of the blocking block 93, a sealing plate 95 is fixedly connected to the end of the connecting plate 94, the exhaust pipe 91 is fixedly connected to the top of the upper test disk 31, the blocking block 93 is matched with the exhaust pipe 91, the bottom of the connecting plate 94 is fixedly connected with a second spring 96, the second spring 96 is fixedly connected to the top of the upper test disk 31, and the sealing plate 95 fits with the top of the vacuum cylinder 11.

[0051] Working principle: On the basis of the first embodiment, when the pressure regulating plate 8 moves upward, the connecting pipe 9, the fixing rod 92 and the blocking block 93 will slide upward, and the sealing plate 95 will move upward. When the blocking block 93 cannot block the exhaust pipe 91, the gas in the space formed by the upper test plate 31 and the lower test plate 32 will be discharged through the exhaust pipe 91 in the connecting pipe 9. At the same time, since the sealing plate 95 cannot seal the top of the vacuum cylinder 11, the fan blade 111 will draw in outside air to ensure sufficient oxygen when the steel rod is subjected to corrosion test;

[0052] Sufficient oxygen during corrosion testing of steel rods can ensure the stable progress of corrosion. Corrosion is an oxidation process that requires oxygen as the final electron acceptor. Without sufficient oxygen, the corrosion process will be restricted and may not be fully carried out, resulting in inaccurate test results. Ensuring oxygen supply can accelerate the corrosion process, thereby obtaining more data in a shorter time and shortening the test time; Sufficient oxygen during corrosion testing of steel rods can ensure uniformity of corrosion. In corrosion tests, insufficient oxygen supply may cause inconsistent corrosion degrees in certain parts of the sample surface, affecting the reliability of the test results. Sufficient oxygen supply helps maintain the uniformity of the corrosion process; Sufficient oxygen during corrosion testing of steel rods can achieve accurate simulation of the environment. Many corrosion tests are designed to simulate corrosion conditions in specific environments (such as seawater, soil, atmosphere, etc.). In these environments, oxygen is usually dissolved in water or other media. Providing sufficient oxygen in corrosion testing of steel rods helps simulate conditions in real environments, thereby ensuring the reliability of the data obtained from the test.

[0053] When the pressure in the space formed by the upper test disk 31 and the lower test disk 32 decreases, so that the blocking block 93 blocks the exhaust pipe 91 again, the pressure regulating plate 8 will slide downward under the action of its own gravity, the gravity of the liquid, the blocking block 93, the connecting pipe 9, the fixing rod 92, the sealing plate 95 and the second spring 96 (due to the weight of the second spring 96 and the pressure regulating plate 8, the liquid, the blocking block 93, the connecting pipe 9, the fixing rod 92 and the sealing plate 95, the space formed by the upper test disk 31 and the lower test disk 32 will always be in a high pressure state when the corrosion test of the steel rod is performed), so that the outside air is drawn into the space formed by the top of the pressure regulating plate 8 and the upper test disk 31 through the air inlet 84, and so on, so that the space formed by the upper test disk 31 and the lower test disk 32 forms a pressurized and depressurized state;

[0054] Pressurization and depressurization can test the corrosion strength of steel bars and simulate actual working conditions. Many engineering structures will experience cyclic loads in actual work, such as vibration of bridges and slight deformation of buildings. Reciprocating pressurization and depressurization can simulate these cyclic stresses and help evaluate the long-term performance of steel bars under these conditions. Pressurization and depressurization can detect fatigue crack growth. Under cyclic loads, steel bars may produce tiny fatigue cracks. Reciprocating pressurization and depressurization can produce tiny stress concentration on the surface of the steel bars, accelerating the expansion of cracks, so that the steel bars can be repaired in a shorter time. The crack growth rate and development trend can be evaluated internally; pressurization and pressure relief can evaluate the corrosion resistance. In a corrosive environment, cyclic loads may accelerate the corrosion process. Reciprocating pressurization and pressure relief combined with corrosive solutions can simulate the corrosion fatigue phenomenon of steel bars in the actual working environment and evaluate the corrosion resistance of steel bars under this composite stress. Pressurization and pressure relief can also obtain more data. Through reciprocating pressurization and pressure relief tests, data on the mechanical properties, corrosion rate, crack growth behavior and other aspects of the steel bar under the combined action of corrosion and stress can be obtained, providing a basis for the selection and design of steel bars.

[0055] It should be noted that the specific models and specifications of the motor 10, controller 2, cylinder 3 and camera 86 need to be selected and determined according to the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A corrosion resistance strength testing device for high-strength PC steel bars, comprising a test bench (1) and a controller (2), characterized in that: Also includes: A testing mechanism, the testing mechanism being installed on the top of the test bench (1), the testing mechanism being used to divide the plane of the high-strength PC steel bar to be tested into five testing sections; A drip spray mechanism, the drip spray mechanism is installed in the test mechanism, and the drip spray mechanism is used to change the injection mode of the reagent according to the change of the air pressure inside the test mechanism; A pressure regulating mechanism, which is installed on the top of the drip spray mechanism and is used to change the air pressure inside the test mechanism and change the oxygen content inside the test mechanism; A liquid extraction mechanism, wherein the liquid extraction mechanism is installed on the top of the testing mechanism; An air circulation mechanism, the air circulation mechanism is installed in the testing mechanism, and the air circulation mechanism is used to test the strength of the high-strength PC steel rod in a humid environment; The testing mechanism comprises a cylinder (3) mounted on the top of the testing platform (1); an upper testing disc (31) is fixedly connected to the output end of the cylinder (3); an isolation frame (36) is fixedly connected inside the upper testing disc (31); a lower testing disc (32) is fixedly connected to the top of the testing platform (1); a supporting frame (33) is fixedly connected inside the lower testing disc (32); a filter screen (34) is fixedly connected to the bottom of the supporting frame (33); a collecting bucket (35) is fixedly connected to the bottom of the lower testing disc (32); a telescopic rod (37) is fixedly connected to the top of the filter screen (34); a first spring (38) is fixedly connected to the telescopic rod (37); the upper testing disc (31) and the lower testing disc (32) are matched; the filter screen (34) is fixedly connected inside the lower testing disc (32); and the first spring (38) is fixedly connected to the top of the filter screen (34); The top of the upper test tray (31) is fixedly connected to an acid liquid tank (4), the bottom of the acid liquid tank (4) is fixedly connected to an acid liquid injection pipe (5), the top of the upper test tray (31) is fixedly connected to an alkali liquid tank (6), the bottom of the alkali liquid tank (6) is fixedly connected to an alkali liquid injection pipe (7), and the tops of the acid liquid tank (4) and the alkali liquid tank (6) are both fixedly connected to liquid adding pipes; The drip spray mechanism comprises a pressure regulating plate (8) slidably connected to the upper test plate (31); the top of the pressure regulating plate (8) is fixedly connected to two transfer boxes (81); the tops of the two transfer boxes (81) are fixedly connected to bellows (82); a spray hole (83) is provided on the pressure regulating plate (8); the spray hole (83) is arranged in the transfer box (81); an air injection hole (85) is provided on the top of the transfer box (81); a camera (86) is installed at the bottom of the pressure regulating plate (8); an air inlet (84) is provided on the top of the upper test plate (31); the pressure regulating plate (8) is slidably connected to the isolation frame (36); one of the bellows (82) is connected to the acid injection pipe (5); and the other bellows (82) is connected to the alkali injection pipe (7); The pressure regulating mechanism comprises a connecting pipe (9) fixedly connected to the top of the pressure regulating plate (8), an exhaust pipe (91) being slidably connected to the connecting pipe (9), a fixing rod (92) being fixedly connected inside the connecting pipe (9), a blocking block (93) being fixedly connected to the top of the fixing rod (92), a connecting plate (94) being fixedly connected to the top of the blocking block (93), a sealing plate (95) being fixedly connected to the end of the connecting plate (94), the exhaust pipe (91) being fixedly connected to the top of the upper test plate (31), the blocking block (93) being adapted to fit the exhaust pipe (91), a second spring (96) being fixedly connected to the bottom of the connecting plate (94), and the The second spring (96) is fixedly connected to the top of the upper test disc (31); the liquid extraction mechanism comprises a motor (10) mounted on the top of the acid liquid tank (4) and the alkali liquid tank (6) via a mounting plate; the output end of the motor (10) is fixedly connected to a rotating shaft (101); a reciprocating plate (102) is threadedly connected to the rotating shaft (101); the bottoms of both ends of the reciprocating plate (102) are fixedly connected to piston plates (103); wherein the top of the upper test disc (31) is fixedly connected to a piston cylinder (104); the side wall of the piston cylinder (104) is fixedly connected to a liquid extraction tube (105); and the piston plate (103) is adapted to the piston cylinder (104); The end of the liquid extraction pipe (105) away from the piston cylinder (104) is connected to the collecting bucket (35), the bottom of the piston cylinder (104) is connected to the top of the bellows (82), the liquid extraction pipe (105) is configured in the form of a hose, the air circulation mechanism comprises an air extraction cylinder (11) fixedly connected to the middle of the upper test plate (31), a fan blade (111) is installed in the air extraction cylinder (11), and the side wall of the air extraction cylinder (11) is fixedly connected to the air extraction pipe (112), wherein the lower test plate (3 2) is fixedly connected to an outer wall of the lower test plate (32), a suction hole (114) is provided on the side wall of the lower test plate (32), the suction hole (114) is communicated with the suction ring (113), an exhaust hole (115) is provided on the isolation frame (36), the fan blade (111) is fixedly connected to the rotating shaft (101), the sealing plate (95) is in contact with the top of the suction cylinder (11), and the end of the suction pipe (112) away from the suction cylinder (11) is fixedly connected to the suction ring (113).

2. A corrosion resistance strength testing device for high-strength PC steel bars according to claim 1, characterized in that: The five test sections are two marine environment simulation test sections, one acidic environment simulation test section, one alkaline environment simulation test section and one humid environment simulation test section.

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