Full-automatic dry-wet cycle test device supporting parallel test of various salt solution working conditions

Abstract

A full-automatic dry-wet cycle test device supporting parallel tests of various salt solution working conditions comprises a test box, a liquid storage box is installed on the lower portion of the test box and communicated with the test box through a pipeline, a central control system and a hot air machine box are installed at one end of the test box and one end of the liquid storage box, and the hot air machine box is communicated with the test box through a hot air pipe and provided with a heater. A test box partition plate is arranged in the test box to divide the test box into two independent cells, the two cells of the test box are each provided with a cooling fan and a circulating fan, a liquid storage box partition plate is arranged in the liquid storage box to divide the liquid storage box into two independent cells, and the two cells of the liquid storage box are each provided with a water pump. The central control system is respectively communicated with and controls the heater, the cooling fan, the circulating fan and the water pump; through the arrangement of the water pump and the electric valve, circulation of a salt solution is realized; through cooperative work of a heater, an air blower and a cooling fan, accurate control over the temperature of the device is ensured; the central control system is arranged to control all the devices to work, full-automatic operation of the test is achieved, and the test efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of concrete durability test in civil engineering, in particular to a full-automatic dry-wet cycle test device supporting parallel testing of multiple types of salt solution working conditions. Background Art

[0002] As an indispensable material in construction projects, the durability of concrete is crucial to ensure the safety of buildings and extend their service life. However, in Northwest my country and some coastal areas, the soil is rich in a large number of ions that are harmful to reinforced concrete structures. These harmful ions pose a severe challenge to the durability of reinforced concrete structures. For example, sulfates in the environment will react chemically with certain minerals in concrete to produce expansive corrosion products, causing concrete damage and greatly affecting its material strength; chloride salts in the environment will enter the concrete, causing the steel bars inside to depassivate and accelerate the corrosion of the steel bars, resulting in rust expansion damage to reinforced concrete and a reduction in the cross section of the steel bars. Especially in an alternating dry-wet environment, the transmission speed of ions in concrete is usually faster than in a single dry or wet environment, which will greatly accelerate the corrosion process of reinforced concrete. Therefore, the dry-wet cycle test of reinforced concrete can be used as an important means to detect and study the durability of reinforced concrete materials. It simulates the corrosion process under natural conditions by controlling the periodic dry-wet changes of the specimens in a salt solution environment, and then evaluates the durability of reinforced concrete by testing indicators such as electrochemistry, corrosion depth, and concrete strength. This method not only helps to reveal the performance evolution of concrete under the influence of different environmental factors, but also provides an important theoretical basis for the optimal design and practical application of concrete materials.

[0003] Although the dry-wet cycle test has many advantages, the traditional test method still has some problems. For example:

[0004] 1. The traditional test process is cumbersome. Some researchers use manual timed transport to carry out the test. First, the specimen is taken out of the salt solution to dry, then moved to the oven for drying, then taken out to cool, and finally immersed in the salt solution. In just one cycle, the specimen needs to be transported four times, which greatly increases the workload of the test.

[0005] 2. The traditional oven lacks an air circulation system. When the specimens are placed too closely, the internal air circulation is not smooth, which can easily cause local overtemperature, resulting in large test errors.

[0006] 3. The capacity of the traditional dry-wet cycle test chamber is small, and only the size and quantity of the specimens for the standard dry-wet cycle test in the specification are considered. The number of specimens tested in a single test is limited, and the specimen volume is limited, which cannot meet the needs of large specimens and special sizes in scientific research;

[0007] 4. The dry-wet cycle test chambers on the market can only circulate one solution in a single test. If the test is carried out with the salt solution environment as a variable, multiple dry-wet cycle test chambers are required, which is not only costly, but also irrelevant variables such as ambient temperature and humidity between different test chambers will affect the test accuracy.

[0008] For example, CN109856040A discloses a concrete dry-wet cycle corrosion test machine, including a corrosion box connected to a liquid storage tank, a water-permeable plate arranged in the corrosion box, an air outlet pipe and an air inlet pipe with a first solenoid valve, a second solenoid valve and a third solenoid valve arranged above and below the water-permeable plate, respectively, the air outlet pipe and the air inlet pipe extend to the outside of the corrosion box respectively and are connected through a connecting pipe, the connecting pipe is located between the first and second solenoid valves, and a heat exchanger with a blower is arranged on the connecting pipe; the corrosion box is provided with a first and a second temperature and humidity sensor, and the signal output ends of the first and the second temperature and humidity sensors are connected to the first and second solenoid valves respectively. The signal input end of the single-chip microcomputer is connected, and the control output end of the single-chip microcomputer is respectively connected to the control input end of the solenoid valve and the control input end of the heat exchanger; the test device can realize fully automatic control of operations such as liquid injection, immersion, air drying, heating, and cooling during the corrosion test, but the corrosion box capacity of the device is small and can only accommodate 18 standard-sized specimens, and cannot realize dry-wet cycle tests of large specimens; in addition, the liquid storage tank of the device is placed parallel to the corrosion box, and a double water pump needs to be installed for water level control, and the solution in the corrosion box cannot be completely emptied, which affects the drying process of the specimens, and the energy consumption and floor space are larger than those of the present device.

[0009] For example, CN110823799A discloses a vertical dry-wet cycle box device for a corrosive environment. The invention comprises a casing; the casing is hollow and is divided into a circulation box and a liquid storage tank which are arranged at intervals in the upper and lower parts by a built-in fixing frame; a connecting structure connecting the circulation box and the liquid storage tank is installed on the fixing frame at the bottom of the circulation box, and a liquid injection port and an air vent are arranged on the circulation box; the liquid injection port is connected to a water pump through a pipeline; the air vent is connected to a blower through a pipeline; a liquid discharge port is arranged on the liquid storage tank; the liquid discharge port is connected to the water pump through a pipeline; the circulation box and the liquid storage tank of the test device are respectively arranged on the upper and lower sides of the fixing frame, and compared with the traditional horizontal structure, the space occupied is smaller, and the soaking solution can flow into the liquid storage tank under the action of gravity; however, the circulation box and the liquid storage tank of the device are an integrated casing, which are only separated by a fixing frame in the middle, and the insulation measures are not perfect. During the heating stage, the temperature of the solution in the liquid storage tank is easily affected by the upper circulation box, which increases the uncontrollable test factors, and no circulating wind field is formed in the circulation box. If there are many test specimens, it is easy to cause uneven temperature in the circulation box.

[0010] For example, in the article "Research on the Sulfate Erosion Resistance of Desert Sand Concrete under Dry-Wet Cycles" in the 11th issue of "Industrial Construction" in 2023, the researchers used natural immersion at room temperature and electric blast drying ovens to achieve dry-wet alternation of specimens. During the experiment, the specimens were manually moved to change the test environment. Although this method saves costs and has low requirements for test equipment, repeated manual handling of specimens will inevitably cause damage to the specimens. When there are many specimens, it consumes manpower, makes it difficult to complete timed operations, and easily produces uncontrollable test variables.

[0011] For example, in the article "Analysis of Rust Expansion Cracks of Reinforced Concrete Columns in Dry-Wet Cyclic Corrosion Environment" published in the 6th issue of "Concrete" in 2017, the researchers used a self-designed dry-wet cycle device to conduct dry-wet cycle tests. However, the device used a natural drying method and did not consider the circulating fan, which resulted in a long drying time for the test and inconsistent drying progress of each specimen.

[0012] Based on this background, a fully automatic dry-wet cycle test device that supports parallel testing of multiple types of salt solution conditions came into being. It has a large test space that can be freely divided. It can simultaneously carry out cycle tests in multiple salt solution environments or perform dry-wet cycles on large specimens. The test is automated, with a simple structure, simplified processes, high efficiency, and low labor intensity. At the same time, it expands the application scope of the dry-wet cycle test and provides a better tool for the durability research of concrete. Summary of the invention

[0013] The technical problem to be solved by the utility model is to provide a fully automatic dry-wet cycle test device that supports parallel testing of multiple types of salt solution working conditions, thereby solving the problems that traditional dry-wet cycle test instruments have a small capacity, one test device can only circulate one solution, and have a low degree of automation.

[0014] In order to solve the above technical problems, the technical solution adopted by the utility model is: a fully automatic dry-wet cycle test device that supports parallel testing of multiple types of salt solution working conditions, including a test box, a liquid storage tank is installed at the lower part of the test box, and the two are connected through a pipeline. A central control system and a hot air box are installed at one end of the test box and the liquid storage tank. The hot air box is connected to the test box through a hot air duct, and the hot air box is provided with a heater. A test box partition is provided in the test box to divide the test box into two independent compartments, and both compartments of the test box are provided with a cooling fan and a circulating fan. A liquid storage tank partition is provided in the liquid storage tank to divide the liquid storage tank into two independent compartments, and both compartments of the liquid storage tank are provided with a water pump. The central control system is respectively connected to and controlled by the heater, the cooling fan, the circulating fan, and the water pump.

[0015] In a preferred embodiment, the test box includes a test box body, which is a hollow, lidless, sealed hexahedron. A test box partition is arranged in the middle of the body to divide the test box into two independent compartments. The test box and the test box partition are made of corrosion-resistant and high-temperature resistant stainless steel plates, and the joints between the test box and the test box partition are sealed with sealing strips.

[0016] In the preferred embodiment, the liquid storage tank structure is the same as the test tank, including a liquid storage tank body, which is a hollow, transparent, lidless sealed hexahedron. A liquid storage tank partition is arranged in the middle of the body to divide the liquid storage tank into two independent compartments. The liquid storage tank and the liquid storage tank partition are made of corrosion-resistant polypropylene material, and the joints between the liquid storage tank and the liquid storage tank partition are sealed with corrosion-resistant fluororubber sealing strips.

[0017] In the preferred scheme, the outside of the test box and the liquid storage tank are covered with a protective cover. The protective cover is a sealed hexahedron with five sides fixed to each other. A movable cover is arranged on the top. The movable cover is hinged on the top of the test box, and an electric rod and a lock are arranged between the two. The upper part of one side of the protective cover is fixed, and the lower part is provided with a movable side panel on the side of the liquid storage tank body. The electric rod is connected to the central control system and is controlled by it.

[0018] In a preferred solution, water pumps are fixedly installed in the two compartments of the liquid storage box body, and a water inlet pipe is installed at the water outlet of the water pump. The water inlet pipe passes through the bottom of the test box to transport liquid to the two compartments of the test box respectively.

[0019] In a preferred solution, test racks are installed in both compartments of the test box liquid storage box body, and the test racks are arranged into a plurality of equidistant squares.

[0020] In a preferred solution, a drain pipe is also installed at the bottom of the test box liquid storage box body, and a filter and an electric valve are installed on the drain pipe in sequence. The electric valve is connected to the central control system and is controlled by it.

[0021] In a preferred solution, the liquid storage tank is provided with an overflow pipe, and the overflow pipe is connected with the test box and the liquid storage tank, and is also connected with the drainage pipe of the test box.

[0022] In a preferred embodiment, a heater and a blower which are interconnected are installed in the hot air machine box, a hot air duct is installed at the blower outlet, the hot air duct passes through the protective cover and the side wall of the test box body, and transports the hot air into the test box body. The heater and the blower are respectively connected to the central control system and controlled by it.

[0023] In a preferred solution, a plurality of heat dissipation holes are provided on the outer side of the hot air box.

[0024] In a preferred solution, the water inlet pipe 12, the test frame 13, the drain pipe 14, the filter 15, the electric valve 16 and the overflow pipe 17 are made of stainless steel.

[0025] The fully automatic dry-wet cycle test device supporting parallel testing of multiple types of salt solution working conditions provided by the utility model has the following beneficial effects:

[0026] 1. The test chamber partition used in the utility model can divide the interior of the test chamber into multiple independent spaces along the longitudinal direction. Different test solutions can be circulated in each independent space, but they share a set of heating and central control systems. Compared with using multiple sets of traditional dry-wet cycle testers to circulate multiple different solutions separately, this test device has the advantages of saving cost and space, simplifying the operation process, and facilitating the control of variables.

[0027] 2. The test chamber of the utility model is equipped with a circulating fan and a heat dissipation fan. During the drying stage, the circulating fan can form a circulating wind field inside the test chamber, so that the test piece is heated more evenly. During the cooling stage after the drying, the heat dissipation fan can extract the high-temperature air in the test chamber, so that a negative pressure environment is formed in the test chamber, and the outside normal temperature air enters the test chamber through the air duct, so that the temperature in the chamber quickly drops to room temperature.

[0028] 3. The utility model adopts the method of adjusting the height of the overflow pipe orifice to control the liquid level during the immersion stage. After the water level is above the end of the overflow pipe, the excess solution flows back to the liquid storage tank through the overflow pipe. The liquid storage tank contains more solution than the test amount, thus avoiding the problem of needing to replenish the solution after each dry-wet cycle due to water evaporation during the drying stage.

[0029] 4. The utility model concentrates all operation interfaces into a central control system, and controls multiple important parameters such as the test chamber temperature, heating time, cooling time, soaking time, drainage time, etc. through one operation interface, with high visualization and easy operation;

[0030] 5. The multi-layer structure design of the utility model enables the test box and other components to be effectively fixed and convenient for transportation, while also avoiding the risk of environmental pollution and short circuit of electronic equipment caused by leakage of test solution;

[0031] 6. The utility model reduces the test cost through integrated design and automated operation, provides an efficient and accurate test platform for concrete durability research, and has significant technological progress and practical application value;

[0032] 7. This utility model supports the fully automatic dry-wet cycle test device for parallel testing of multiple types of salt solution conditions, aiming to improve the efficiency and flexibility of concrete durability tests under multiple types of salt solution conditions. The test box is equipped with multiple independent and adjustable test spaces;

[0033] 8. The utility model can adjust the test space as needed to achieve independent working condition simulation through the flexible disassembly and assembly and sealing design of the test box partition. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The utility model is further described below in conjunction with the accompanying drawings and implementation examples:

[0035] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0036] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0037] Figure 3 It is a schematic diagram of solution circulation of the utility model;

[0038] Figure 4 This is a schematic diagram of the wind circulation of the utility model;

[0039] In the figure: test box 1, liquid storage tank 2, central control system 3, hot air machine box 4, hot air duct 5, heater 6, cooling fan 7, circulating fan 8, water pump 9, movable cover 10, movable side panel 11, water inlet pipe 12, test frame 13, drain pipe 14, filter 15, electric valve 16, overflow pipe 17, blower 18, test box body 101, test box partition 102, liquid storage tank body 201, liquid storage tank partition 202. DETAILED DESCRIPTION

[0040] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0041] like Figures 1 to 4 As shown, a fully automatic dry-wet cycle test device supporting parallel testing of multiple types of salt solution working conditions includes a test box 1, a liquid storage tank 2 is installed at the lower part of the test box 1, and the two are connected through a pipeline. A central control system 3 and a hot air box 4 are installed at one end of the test box 1 and the liquid storage tank 2. The hot air box 4 is connected to the test box 1 through a hot air pipe 5. The hot air box 4 is provided with a heater 6. A test box partition 102 is provided in the test box 1 to divide the test box 1 into two independent compartments. The two compartments of the test box 1 are both provided with a heat dissipation fan 7 and a circulation fan 8. A liquid storage tank partition 202 is provided in the liquid storage tank 2 to divide the liquid storage tank 2 into two independent compartments. The two compartments of the liquid storage tank 2 are both provided with a water pump 9. The central control system 3 is respectively connected to and controls the heater 6, the heat dissipation fan 7, the circulation fan 8, and the water pump 9.

[0042] In this embodiment, the test box 1 includes a test box body 101, which is a hollow, lidless, sealed hexahedron. A test box partition 102 is arranged in the middle of the body to divide the test box 1 into two independent compartments. The test box 1 and the test box partition 102 are made of corrosion-resistant and high-temperature resistant stainless steel plates. The joints between the test box 1 and the test box partition 101 are sealed with high-temperature and corrosion-resistant fluororubber sealing strips.

[0043] Furthermore, the structure of the liquid storage tank 2 is the same as that of the test tank 1, including a liquid storage tank body 201, which is a hollow, transparent, uncovered sealed hexahedron. A liquid storage tank partition 202 is arranged in the middle of the body to divide the liquid storage tank 2 into two independent compartments. The liquid storage tank 2 and the liquid storage tank partition 202 are made of corrosion-resistant polypropylene material, and the joints between the liquid storage tank 2 and the liquid storage tank partition 202 are sealed with corrosion-resistant fluororubber sealing strips.

[0044] Furthermore, the exterior of the test box 1 and the liquid storage tank 2 are covered with a protective cover, which is a sealed hexahedron with five faces fixed to each other. A movable cover 10 is provided on the top, and the movable cover 10 is hingedly mounted on the top of the test box 1. An electric rod and a lock are provided between the two. The upper part of one side of the protective cover is fixed, and a movable side panel 11 is provided on the lower side of the liquid storage tank body 201. The electric rod is connected to the central control system 3 and is controlled by it.

[0045] Furthermore, a water pump 9 is fixedly installed in the two compartments of the liquid storage box body 201 of the liquid storage box 2, and a water inlet pipe 12 is installed at the water outlet of the water pump 9. The water inlet pipe 12 passes through the bottom of the test box 1 to transport liquid to the two compartments of the test box 1 respectively.

[0046] Furthermore, the two compartments of the liquid storage box body 201 of the test box 1 are both equipped with test racks 13, and the test racks 13 are arranged into a plurality of equidistant squares.

[0047] Furthermore, a drain pipe 14 is installed at the bottom of the liquid storage tank body 201 of the test box 1, and a filter 15 and an electric valve 16 are installed on the drain pipe 14 in sequence. The electric valve 16 is connected to the central control system 3 and is controlled by it.

[0048] Furthermore, the liquid storage tank 2 is provided with an overflow pipe 17 , which connects the test box 1 and the liquid storage tank 2 , and is also connected to the drain pipe 14 of the test box 1 .

[0049] Furthermore, the hot air box 4 is installed with a heater 6 and a blower 18 which are interconnected, and a hot air duct 5 is installed at the outlet of the blower 18. The hot air duct 5 passes through the protective cover and the side wall of the test box body 101 of the test box 1 to transport the hot air into the test box 1. The heater 6 and the blower 18 are respectively connected to the central control system 3 and controlled by it.

[0050] Furthermore, a plurality of heat dissipation holes are arranged on the outer side of the hot air box 4 .

[0051] Furthermore, the water inlet pipe 12, the test frame 13, the drain pipe 14, the filter 15, the electric valve 16 and the overflow pipe 17 are made of stainless steel.

[0052] When in use, the fully automatic dry-wet cycle test device that supports parallel testing of multiple types of salt solution conditions shall be installed and debugged to be qualified, and then fixed firmly at the test site;

[0053] First, determine the type of solution that needs to be dry-wet cycled and the number of test pieces corresponding to different solutions, place the test box partition 101 and the liquid storage box partition 201 in the test box 1 according to the test requirements, and fix them with silicone gaskets;

[0054] Then pour the prepared solution into the liquid storage tank 2 through the drain pipe 14 of the test box 1, and then put the specimen rack 13 and the specimens into the test box 1 in sequence, adjust the height of the overflow pipe 17 to be 2 cm higher than the upper surface of the top specimen, cover the movable cover 10 of the test box 1 and lock it securely with a lock;

[0055] Then, the specimen is dried in the drying mode. After the drying is completed, the specimen is cooled to room temperature. The test parameters such as immersion time, drying temperature, drying time, number of cycles, etc. are set through the central control system 3 to start the first dry-wet cycle. The dry-wet cycle test includes the steps of immersion, drainage, air drying, heating, heat preservation, cooling, etc. Completing a set of the above steps is to complete a cycle. Repeating the above steps multiple times can achieve multiple cycles. The specific steps and methods are as follows:

[0056] Step 1: Soaking. The central control system 3 controls the water pump 9 to start working. The test solution enters the test box 1 from the liquid storage tank 2 through the water inlet pipe 12. When the liquid level reaches the outlet of the overflow pipe 17, the water pump 9 stops working, and the excess solution flows back to the liquid storage tank 2 through the overflow pipe 17.

[0057] Step 2: Draining. When the immersion time reaches the immersion time set by the test device, the electric valve 16 at the bottom of the drain pipe 14 is opened, and the solution flows from the upper test box 1 into the bottom liquid storage tank 2 under the action of its own weight. When the solution in the test box 1 is emptied, the electric water pump 9 is turned off.

[0058] Step 3: Air drying. After the drainage is completed, the blower 18, the heat dissipation fan 7 and the circulation fan 8 start to work, so that the outside air flows along the blower 18 → the heater 6 (not turned on and not working at this time) → the hot air duct 5 → the test chamber 1 → the heat dissipation fan 7 → the outside environment, and the humid air in the test chamber 1 is discharged;

[0059] Step 4: Heating. After air drying, the heat dissipation fan 7 stops working, the blower 18 and the circulating fan 8 continue to work, and the heater 6 starts working at the same time. The outside air enters the heater 6 through the blower 18 for heating. After heating, the hot air enters the test box 1 along the hot air pipe 8, and the whole test box 1 is evenly heated under the action of the circulating fan 8.

[0060] Step 5: Insulation. After the temperature of the test chamber 1 reaches the set temperature, the circulating fan 8 continues to work, and the blower 18 and the heater 6 operate at low power under the control of the central control system 3 to maintain the temperature in the test chamber 1 at the set temperature ±5°C;

[0061] Step 6: Cooling. When the drying time reaches the set value, the heater 6 stops working, the blower 18 and the circulating fan 8 continue to work, and the heat dissipation fan 7 starts working to extract the high-temperature air in the test box 1, so that a negative pressure environment is formed in the test box 1, and the outside air enters the test box 1 along the blower 18, and the temperature of the concrete specimen decreases;

[0062] After cooling is completed, one dry-wet cycle is completed and the immersion step of the next dry-wet cycle is started. At the same time, the central control system 3 records the number of cycles plus one; when the number of cycles reaches the set value, the test device stops working, the movable cover 10 on the test box 1 is opened to take out the test piece for subsequent testing; and the circulating solution in the liquid storage tank 2 is promptly emptied and rinsed with clean water. After the test device is dry, the movable cover 10 is closed and the test device is placed in a cool and dry place.

[0063] In the preferred embodiment, the test box 1 includes a test box body 101, which is a hollow, uncovered, sealed hexahedron. A test box partition 102 is arranged in the middle of the body to divide the test box 1 into two independent compartments. The test box 1 and the test box partition 102 are made of corrosion-resistant and high-temperature resistant stainless steel plates, and the joints between the test box 1 and the test box partition 101 are sealed with high-temperature and corrosion-resistant fluororubber sealing strips; the above arrangement further improves the utilization efficiency of the space of the test box 1, and realizes the dry-wet cycle test of concrete specimens under different salt solution conditions in the test device; the use of stainless steel material for the test box 1 and the test box partition 102 improves the corrosion resistance and high-temperature resistance of the device, thereby further improving the safety, reliability and service life of the device; the use of sealing strips at the joints effectively separates the two compartments while improving the sealing of the device and the accuracy and effectiveness of the test results.

[0064] In the preferred embodiment, the structure of the liquid storage tank 2 is the same as that of the test tank 1, including a liquid storage tank body 201, which is a hollow, transparent, uncovered sealed hexahedron. A liquid storage tank partition 202 is arranged in the middle of the body to divide the liquid storage tank 2 into two independent compartments. The liquid storage tank 2 and the liquid storage tank partition 202 are made of corrosion-resistant polypropylene material, and the joints between the liquid storage tank 2 and the liquid storage tank partition 202 are sealed with corrosion-resistant fluororubber sealing strips; with the above arrangement, the liquid storage tank body 201 is transparent and uncovered, which is convenient for observing the circulating solution inside the liquid storage tank 2 and replenishing the circulating solution; the use of stainless steel materials for the liquid storage tank 2 and the liquid storage tank partition 202 improves the corrosion resistance and high temperature resistance of the device, thereby further improving the safety, reliability and service life of the device; the use of sealing strips at the joints effectively separates the two compartments while improving the sealing of the device and the accuracy and effectiveness of the test results.

[0065] In the preferred scheme, the outside of the test box 1 and the liquid storage tank 2 are covered with a protective cover. The protective cover is a sealed hexahedron with five sides fixed to each other. A movable cover 10 is arranged on the top. The movable cover 10 is hingedly mounted on the top of the test box 1, and an electric rod and a lock are arranged between the two. The upper part of one side of the protective cover is fixed, and a movable side panel 11 is arranged on the side of the liquid storage tank body 201 at the lower part. The electric rod is connected to the central control system 3 and is controlled by it. With the above arrangement, the test box 1 and the liquid storage tank 2 are located in the same vertical space, which saves floor space, makes the device compact, and is easy to install and transport. The protective cover has the function of sealing and heat preservation. This design can provide physical isolation and can effectively prevent the leakage of circulating solution from polluting the environment. At the same time, insulation material can be filled between the box body and the protective cover to improve the insulation effect of the device.

[0066] In the preferred solution, water pumps 9 are fixedly installed in the two compartments of the liquid storage tank 2 and the liquid storage tank body 201. The water outlet of the water pump 9 is installed with a water inlet pipe 12. The water inlet pipe 12 passes through the bottom of the test box 1 to transport liquid to the two compartments of the test box 1 respectively. With the above arrangement, each water pump 9 can be independently controlled, and the central control system 3 can adjust its flow rate and water volume according to the needs of different tests, thereby increasing the flexibility and accuracy of the test. At the same time, each water pump 9 is installed separately for easy inspection, maintenance or replacement. If more test requirements are required, additional water pumps 9 can be easily added.

[0067] In the preferred embodiment, the two compartments of the liquid storage box body 201 of the test box 1 are equipped with test racks 13, and the test racks 13 are arranged into a number of equidistant squares; the above arrangement makes the spacing between the test pieces controllable, effectively avoiding the local temperature of the test pieces being too high or too low due to inconsistent spacing during the insulation stage, thereby further improving the test accuracy.

[0068] In the preferred embodiment, a drain pipe 14 is further installed at the bottom of the liquid storage tank body 201 of the test box 1, and a filter 15 and an electric valve 16 are installed on the drain pipe 14 in sequence. The electric valve 16 is connected to the central control system 3 and controlled by it; in the above arrangement, the electric valve 16 is controlled by the central control system 3, and the central control system 3 can accurately control the drainage time, amount and frequency according to a preset program, further improving the accuracy of the test and the degree of automation of the device. The filter 15 is installed in the front section of the drain pipe 14 to prevent concrete spalling generated by the dry-wet cycle of the specimen from entering the electric valve 16 and the water pump 9, thereby ensuring the safety of the device.

[0069] In a preferred solution, the liquid storage tank 2 is provided with an overflow pipe 17, which connects the test box 1 and the liquid storage tank 2, and is also connected to the drain pipe 14 of the test box 1; the above arrangement further ensures the safety of the test device.

[0070] In the preferred scheme, the hot air box 4 is installed with a heater 6 and a blower 18 that are interconnected, and a hot air duct 5 is installed at the outlet of the blower 18. The hot air duct 5 passes through the protective cover and the side wall of the test box body 101 of the test box 1 to transport the hot air into the test box 1. The heater 6 and the blower 18 are respectively connected to the central control system 3 and controlled by it; with the above settings, the blower 18 can quickly transport the heat generated by the heater 6 to the entire test box 1, and the design of the hot air duct 5 ensures that the hot air is evenly distributed in the test box, so that the test conditions are consistent and the consistency of the test results is improved.

[0071] In a preferred solution, a plurality of heat dissipation holes are provided on the outer side of the hot air box 4; this arrangement enables the hot air box 4 to have good heat dissipation, prevents the equipment from overheating, improves the stability of the equipment, and avoids safety hazards caused by excessive temperature of the equipment.

[0072] In the preferred embodiment, the water inlet pipe 12, test frame 13, drain pipe 14, filter 15, electric valve 16 and overflow pipe 17 are made of stainless steel; the above arrangement improves the corrosion resistance and high temperature resistance of the device, thereby further improving the safety, reliability and service life of the device.

[0073] In summary, the utility model provides a fully automatic dry-wet cycle test device that supports parallel testing of multiple types of salt solution working conditions. The device consists of a test box 1, a liquid storage tank 2, an integrated water circulation and hot air circulation system, and an intelligent central control system 3. When in use, the test box is first divided into independent spaces using the test box partition 102 and the liquid storage tank partition 202 according to the test requirements, and then the configured circulating solution, test rack 13 and test piece are placed in the test box in turn, the height of the overflow pipe 17 is adjusted, the test box cover is covered, and the test parameters are set through the central control system 3, and the dry-wet cycle test can be automatically started; the test box 1 can be divided into a plurality of independent and adjustable test spaces by the test box partition 102, each test space has an independent water circulation pipeline, and the hot air circulation is designed in parallel to ensure the uniformity of temperature. The test device controls the inflow and outflow of the solution through the water pump 9 and the electric valve 16 to realize the circulation of the salt solution in the test box; the heater 6, the blower 18 and the cooling fan 7 work together to ensure the precise control of the test temperature; the water pump 9, the electromagnetic valve 16, the heater 6, the cooling fan 7 and other equipment are controlled by the central control system 3 to realize the full automatic operation of the dry-wet cycle test; through the flexible disassembly and assembly and sealing design of the test box partition 102, the test space can be adjusted according to the needs to realize independent working condition simulation; the heating system adopts stepless regulation to ensure rapid heating and constant temperature control, and the wind circulation design ensures the uniform heating of the test piece in the drying stage and the rapid cooling in the cooling stage; the liquid storage tank 2 is transparent to the test box 102, and the test space can be adjusted according to the needs to realize independent working condition simulation. The clear design makes it easy to observe the solution state, and automatic liquid level management is achieved during the immersion stage through height control of the overflow pipe; the test device has a compact structure and is easy to operate. It can perform cyclic tests in multiple salt solution environments at the same time, and is particularly suitable for dry-wet cycle tests of large specimens, significantly expanding the scope of use of traditional test equipment; a test can accommodate a large number of specimens, greatly improving test efficiency, reducing manual intervention, and reducing errors; in addition, the device uses corrosion-resistant and high-temperature resistant materials to ensure long-term stable operation and easy maintenance, providing an efficient and accurate testing platform for concrete durability research, with significant technological progress and practical application value, and has broad application prospects.

Claims

1. A fully automatic dry-wet cycle test device supporting parallel testing of multiple types of salt solution conditions, comprising a test chamber (1), characterized in that: A liquid storage tank (2) is installed at the lower part of the test box (1), and the two are connected by a pipeline. A central control system (3) and a hot air box (4) are installed at one end of the test box (1) and the liquid storage tank (2). The hot air box (4) is connected to the test box (1) through a hot air pipe (5). The hot air box (4) is provided with a heater (6). A test box partition (102) is provided in the test box (1) to divide the test box (1) into two independent compartments. Both compartments of the test box (1) are provided with a heat dissipation fan (7) and a circulation fan (8). A liquid storage tank partition (202) is provided in the liquid storage tank (2) to divide the liquid storage tank (2) into two independent compartments. Both compartments of the liquid storage tank (2) are provided with a water pump (9). The central control system (3) is respectively connected to and controlled by the heater (6), the heat dissipation fan (7), the circulation fan (8), and the water pump (9).

2. The fully automatic dry-wet cycle test device supporting parallel testing of multiple types of salt solution conditions according to claim 1 is characterized in that: The test box (1) comprises a test box body (101), which is a hollow, lidless, sealed hexahedron. A test box partition (102) is arranged in the middle of the body to divide the test box (1) into two independent compartments.

3. The fully automatic dry-wet cycle test device supporting parallel testing of multiple types of salt solution conditions according to claim 2 is characterized in that: The structure of the liquid storage box (2) is the same as that of the test box (1), comprising a liquid storage box body (201), the liquid storage box body (201) being a hollow, transparent, lidless, sealed hexahedron, and a liquid storage box partition (202) being arranged in the middle of the body to divide the liquid storage box (2) into two independent compartments.

4. The fully automatic dry-wet cycle test device supporting parallel testing of multiple types of salt solution conditions according to claim 3 is characterized in that: The test box (1) and the liquid storage box (2) are covered with a protective cover on the outside. The protective cover is a sealed hexahedron with five faces fixed to each other. A movable cover plate (10) is arranged on the top. The movable cover plate (10) is hingedly mounted on the top of the test box (1). An electric rod and a lock are arranged between the two. The upper part of one side of the protective cover is fixed, and the lower part is provided with a movable side plate (11) on the side of the liquid storage box body (201). The electric rod is connected to the central control system (3) and is controlled by it.

5. The fully automatic dry-wet cycle test device supporting parallel testing of multiple types of salt solution working conditions according to claim 4 is characterized in that: A water pump (9) is fixedly installed in both compartments of the liquid storage box body (201), and a water inlet pipe (12) is installed at the water outlet of the water pump (9). The water inlet pipe (12) passes through the bottom of the test box (1) to transport liquid to the two compartments of the test box (1).

6. The fully automatic dry-wet cycle test device supporting parallel testing of multiple types of salt solution working conditions according to claim 4 is characterized in that: The two compartments of the liquid storage box body (201) of the test box (1) are both equipped with test racks (13), and the test racks (13) are arranged into a plurality of equidistant squares.

7. The fully automatic dry-wet cycle test device supporting parallel testing of multiple types of salt solution working conditions according to claim 4 is characterized in that: A drainage pipe (14) is also installed at the bottom of the liquid storage box body (201) of the test box (1), and a filter (15) and an electric valve (16) are installed on the drainage pipe (14) in sequence. The electric valve (16) is connected to the central control system (3) and is controlled by it.

8. The fully automatic dry-wet cycle test device supporting parallel testing of multiple types of salt solution working conditions according to claim 7 is characterized in that: The liquid storage tank (2) is provided with an overflow pipe (17), and the overflow pipe (17) is connected to the test box (1) and the liquid storage tank (2), and is also connected to the drainage pipe (14) of the test box (1).

9. The fully automatic dry-wet cycle test device supporting parallel testing of multiple types of salt solution working conditions according to claim 2, characterized in that: The hot air machine box (4) is equipped with a heater (6) and a blower (18) which are interconnected. A hot air pipe (5) is installed at the outlet of the blower (18). The hot air pipe (5) passes through the protective cover and the side wall of the test box body (101) to transport hot air into the test box (1). The heater (6) and the blower (18) are respectively connected to the central control system (3) and are controlled by it.

10. The fully automatic dry-wet cycle test device supporting parallel testing of multiple types of salt solution working conditions according to claim 9, characterized in that: The outer side surface of the hot air machine box (4) is provided with a plurality of heat dissipation holes.

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