A device for detecting the compressive strength of concrete in a low-temperature, high-salt-mist environment

Abstract

The application discloses a device for detecting the compressive strength of concrete under low temperature and high salt fog environment, and relates to the technical field of concrete durability test equipment. The device comprises a shell, an opening and closing device, a liquid adding device, a liquid level sensor, a liquid discharging valve, a liquid temperature sensor, a liquid concentration sensor, a spraying device, a temperature and humidity sensor, a fog concentrator, an air supply device, a heat leading device and a cold leading device connected to the air supply device, a base frame and a compressive strength detector. The device has the advantages that full-automatic closed-loop control can be realized on the liquid level, concentration, temperature of the soaking liquid, air temperature and humidity, and salt fog concentration, the test conditions are stable and repeatable, the multi-component pipes and nozzles of the spraying device are uniformly distributed, natural diffusion and settlement of the salt fog are realized, direct spraying is avoided, the air supply device cooperates with the heat leading device and the cold leading device, uniform heating and cooling are realized through air circulation, direct cold and hot collision is avoided, and the complete deterioration process of "salt fog wetting, low temperature freezing and dry concentration" can be accurately reproduced.

Description

Technical Field

[0001] This invention relates to the field of concrete durability testing equipment technology, and more specifically to a device for testing the compressive strength of concrete under low temperature and high salt spray conditions. Background Technology

[0002] As the most widely used building material in modern construction engineering, concrete's long-term performance and durability are directly related to the safety and service life of the structure. In marine environments, de-icing salt areas, and industrial corrosive environments, concrete structures often face the dual coupling effects of low-temperature freeze-thaw cycles and salt spray erosion. This harsh environment can lead to damage to the internal microstructure of concrete, steel corrosion, and strength deterioration, seriously affecting the durability and safety of the engineering structure.

[0003] Currently, there are existing technologies for testing devices and methods for concrete compressive strength. For example, the patent document with application number "CN202210506032.3" discloses a device for testing the compressive strength of concrete products. This device applies pressure to the surface of the concrete product to be tested through external components, and then analyzes the compressive strength of the concrete product based on the feedback results. However, existing testing devices are usually only suitable for strength testing under normal conditions and lack applications in simulating the coupled environment of low temperature and high salt spray. The deterioration mechanism of concrete under the combined effects of freeze-thaw cycles and salt erosion is significantly different from that of a single environmental factor. There is a need for a comprehensive test platform that can reproduce the complex deterioration process of "salt spray deposition-low temperature freezing-drying concentration-single-sided immersion" in the laboratory. Therefore, there is an urgent need to develop a device that can accurately test the compressive strength of concrete under the coupled environment of low temperature and high salt spray. Summary of the Invention

[0004] The purpose of this invention is to provide a device for testing the compressive strength of concrete under low temperature and high salt spray conditions in order to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention specifically adopts the following technical solution: This invention proposes a device for testing the compressive strength of concrete under low temperature and high salt spray conditions, comprising: shell; The opening and closing device installed on the outer casing is used to take the concrete block to be tested into the outer casing when the casing is opened, and to seal the outer casing when the casing is closed; A liquid filling device is installed on the outer casing. The output end of the liquid filling device is sealed and inserted into the outer casing to add soaking liquid to the inside of the outer casing to form a liquid layer and add conditioning liquid. A liquid level sensor mounted on the outside of the housing is used to sense the thickness of the liquid layer; A drain valve is installed at the bottom of the housing, with one end of the drain valve sealed and connected to the inside of the housing for draining liquid to lower the liquid level; The liquid temperature sensor and liquid concentration sensor are installed on the outside of the housing. The sensing ends of the liquid temperature sensor and liquid concentration sensor are sealed and penetrate into the housing and contact the liquid layer to detect it. A spraying device is installed on the outside of the housing, with its output end sealed inside the housing and positioned above the concrete block, for spraying salt spray into the housing. The temperature and humidity sensor and the fog concentrator are installed on the outside of the housing. The sensing end of the temperature and humidity sensor is sealed and penetrates into the housing to detect the inside of the housing. The sensing end of the fog concentrator is sealed and penetrates into the housing to detect salt spray inside the housing. A ventilation device is installed on the outside of the housing, the ventilation device has an output and an input end and is connected to the inside of the housing for ventilation; A heating device and a cooling device are connected to the ventilation device. The heating device heats the input end of the ventilation device to raise the temperature inside the outer casing, and the cooling device cools the input end of the ventilation device to lower the temperature inside the outer casing. It also includes a pressure detector fixed to the bottom of the housing and mounted on the outside of the housing.

[0006] As a preferred embodiment of the present invention, the opening and closing device includes a door cover, a viewing window fixed on the door cover, a through-hole provided on the outer casing, and a disassembly and assembly assembly provided between the door cover and the outer casing for sealing and opening / closing the through-hole.

[0007] As a preferred embodiment of the present invention, the disassembly and assembly assembly includes an annular groove on the outer side of the outer shell, a plug ring fixed on the door cover, a fixing hole penetrating the door cover and embedded in the outer shell, and a fastener connecting the fixing hole to fix the door cover on the outer shell. A sealing pad is attached to the inner side of the annular groove, and the plug ring is placed in the annular groove and pressed tightly against the sealing pad.

[0008] As a preferred embodiment of the present invention, the liquid filling device includes a first pump and an outlet pipe and an inlet pipe that are respectively connected and fixed to its outlet and inlet ends. The inlet pipe is a Y-shaped pipe, with one end connected and fixed to the first pump and the other two ends respectively connected and installed with a switch valve.

[0009] As a preferred embodiment of the present invention, the spraying device includes a second pump fixedly mounted on the outside of the base frame, a main pipe with one end connected and fixed to the outlet end of the second pump, a branch pipe with one end connected and fixed to the other end of the main pipe, and a nozzle connected and fixed to the other end of the branch pipe.

[0010] As a preferred embodiment of the present invention, the branch pipes are provided in multiple groups, with one end of each group evenly distributed at the other end of the branch pipe, and the other ends of the multiple groups of branch pipes are evenly distributed inside the outer shell.

[0011] As a preferred embodiment of the present invention, the ventilation device includes two sets of ventilation components symmetrically arranged on the left and right sides of the outer shell and a fan connected to one set of ventilation components. The ventilation components are connected to the inside of the outer shell. When the fan is running, air is blown from one set of ventilation components through the inside of the outer shell to the other set of ventilation components.

[0012] As a preferred technical solution of the present invention, the ventilation assembly includes a manifold, a manifold fixedly connected to an air duct at one end, and a first air valve installed between the manifolds. The air ducts are provided in multiple sets, with one end of each set evenly distributed at one end of the manifold, and the other ends of the multiple sets of air ducts evenly distributed outside the outer shell and fixedly connected to the inside of the outer shell.

[0013] As a preferred embodiment of the present invention, the heat extraction device includes a first shut-off valve connected and installed between manifolds, a first connecting pipe fixed and connected to the manifolds, and a second shut-off valve connected and installed between the first connecting pipes.

[0014] As a preferred embodiment of the present invention, the cooling device includes a third shut-off valve connected and installed between the manifolds, a second connecting pipe fixed and connected to the manifolds, and a fourth shut-off valve connected and installed between the second connecting pipes. The heating device and the cooling device are arranged in sequence and are farther away from the air duct than the fan.

[0015] The beneficial effects of this invention are as follows: By using multiple types of sensors, such as liquid level sensors, liquid temperature sensors, liquid concentration sensors, temperature and humidity sensors, and mist concentrators, to monitor in real time, and in conjunction with actuators such as liquid filling devices, drain valves, heating devices, and cooling devices, fully automatic closed-loop control of the soaking solution level, concentration, temperature, air temperature and humidity, and salt spray concentration is achieved, ensuring stable and repeatable test conditions.

[0016] The spray device features a multi-component tube and nozzles that are evenly distributed, allowing the salt spray to diffuse and settle naturally, avoiding direct spraying. The ventilation device, in conjunction with the heating and cooling devices, achieves uniform heating and cooling through air circulation, avoiding direct clashes between hot and cold. It can accurately reproduce the complete degradation process of "salt spray wetting, low-temperature freezing to drying and concentration".

[0017] The opening and closing device adopts a structure of insert ring and ring groove, with built-in low-temperature resistant silicone rubber sealing gasket and multi-point locking to ensure no air leakage during long-term operation at low temperature and high salt spray. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 A partial diagram of the split structure; Figure 3 yes Figure 1 A schematic diagram of a partial cross-sectional structure viewed from the front; Figure 4 yes Figure 1 A schematic diagram of the rear view structure; Figure 5 This is a schematic diagram of the cross-sectional structure of the door cover of the present invention.

[0019] Reference numerals: Casing-1, Opening / Closing Device-2, Liquid Filling Device-3, Liquid Level Sensor-4, Drain Valve-5, Liquid Temperature Sensor-6, Liquid Concentration Sensor-7, Spray Device-8, Temperature and Humidity Sensor-9, Fog Condenser-10, Ventilation Device-11, Heating Device-12, Cooling Device-13, Base Frame-14, Pressure Resistance Detector-15, Door Cover-21, Viewing Window-22, Annular Groove-23, Insert Ring-24 Solid hole-25, fastener-26, first pump-31, outlet pipe-32, inlet pipe-33, second pump-81, main pipe-82, branch pipe-83, nozzle-84, manifold-111, air duct-112, first air valve-113, fan-114, first shut-off valve-121, first connecting pipe-122, second shut-off valve-123, third shut-off valve-131, second connecting pipe-132, fourth shut-off valve-133. Detailed Implementation

[0020] like Figures 1-5 As shown, the present invention proposes a device for testing the compressive strength of concrete under low temperature and high salt spray conditions, comprising a housing 1, an opening and closing device 2, a liquid filling device 3, a liquid level sensor 4, a drain valve 5, a liquid temperature sensor 6, a liquid concentration sensor 7, a spraying device 8, a temperature and humidity sensor 9, a fog concentrator 10, a ventilation device 11, a heating device 12, a cooling device 13, a base frame 14, and a compressive strength detector 15.

[0021] The outer shell 1 can be welded from 316L stainless steel. The inner wall of the outer shell 1 is pickled and passivated. At the same time, a rigid polyurethane insulation layer of a certain thickness is wrapped around the outer wall of the outer shell 1. The interior of the outer shell 1 forms a sealed test chamber for placing concrete specimens (the specimens can be columnar or rectangular) and simulating a low temperature and high salt spray environment. The bottom of the outer shell 1 is directly set with an immersion liquid layer (such as 5% sodium chloride solution). The specimen is placed in the immersion liquid layer, and the bottom surface of the specimen is in contact with the immersion liquid layer to form a liquid layer of a certain depth.

[0022] The opening and closing device 2 is installed on the outer casing 1 (e.g. Figure 2 (As shown at the front end of the outer casing 1), used for picking up and placing concrete specimens; Specifically: the opening and closing device 2 includes a door cover 21, a viewing window 22, a through-hole on the outer casing 1, and disassembly and assembly components. The viewing window 22 is made of double-layer hollow tempered glass, filled with inert gas in the middle, which can both observe the internal test conditions and prevent condensation. An opening is made on the door cover 21, and a stepped support structure is provided around the opening. The viewing window 22 is then fixedly embedded. A ring-shaped low-temperature resistant silicone rubber sealing strip is provided between the glass edge and the inner wall of the through-hole to fit and press tightly. The sealing strip is made of fluorosilicone rubber or low-temperature resistant silicone rubber material. The joint between the glass and the door cover is then fixed with strong adhesive (epoxy resin structural adhesive or polyurethane sealant) to form a double sealing and fixing structure. The assembly includes an annular groove 23 on the outside of the outer casing 1, a retaining ring 24 fixed on the door cover 21, a fixing hole 25 penetrating the door cover 21 and embedded in the outer casing 1, and a fastener 26 connecting the fixing hole 25. A low-temperature resistant silicone rubber sealing gasket is attached to the inner side of the annular groove 23. When the door cover 21 is closed, the retaining ring 24 is inserted into the annular groove 23 and pressed tightly against the sealing gasket to achieve a reliable seal. The fastener 26 fixes the door cover 21 to the outer casing 1 to ensure that there is no air leakage during long-term operation. The fastener 26 can be a bolt and is fixed with a threaded connection to the fixing hole 25.

[0023] The liquid filling device 3 is installed on the outside of the outer shell 1 and is used to add soaking liquid and conditioning liquid (which can be clean water) into the outer shell 1. The height of the soaking liquid layer is less than that of the opening. The liquid filling device 3 includes a first pump 31 and an outlet pipe 32 and an inlet pipe 33, which are respectively connected and fixed to its outlet and inlet ends. The first pump 31 is a 316L stainless steel magnetic pump, which is corrosion-resistant and leak-free. The inlet pipe 33 is a Y-shaped pipe, one end of which is connected and fixed to the first pump 31, and the other two ends are respectively connected to and equipped with a switch valve (which can be a 316L stainless steel electric regulating valve), which is used to connect the soaking solution tank (5% NaCl solution) and the pure water tank (for dilution). The outlet pipe 32 is sealed and inserted into the outer shell 1, with the output end located above the soaking water tank. In use, according to the control system command, the first pump 31 is started, and the corresponding switch valve is used to select to draw the soaking solution or pure water, which is injected into the soaking water tank through the outlet pipe 32 to realize liquid level replenishment or concentration adjustment. The outlet pipe 32 can be fixed to the outer shell 1 by welding, and the welded position is then pickled and passivated.

[0024] The liquid level sensor 4 is an external ultrasonic liquid level sensor, which is installed on the bottom of the outer side of the housing 1; The working principle of the liquid level sensor 4 is as follows: the sensing end is attached to the outer wall of the bottom of the water tank and emits ultrasonic waves upward. The sound waves penetrate the outer shell 1 and enter the liquid. After reaching the gas-liquid interface, they are reflected back. The liquid level height is calculated by measuring the round-trip time. This method can completely avoid contact with corrosive liquids and has no moving parts, which can improve the long-term operational reliability. The liquid level sensor 4 monitors the thickness of the immersion liquid layer in real time and transmits the signal to the control system.

[0025] The drain valve 5 is installed at the bottom of the housing 1. It is a 316L stainless steel electric regulating valve. One end of the valve is sealed and connected to the bottom of the housing 1. It is used to drain liquid to reduce the liquid level. The drain valve 5 receives the control system signal and can open to a certain degree as needed to achieve precise drainage and avoid liquid level overshoot. The top of the drain valve 5 can be fixed to the housing 1 by welding. After welding, the position is then pickled and passivated. Additional information: The structure of drain valve 5 is the existing one, as shown in "CN202323369994.8". The sealing packing in drain valve 5 is made of PTFE, which is resistant to salt water corrosion; the valve cover is of low temperature type.

[0026] Liquid temperature sensor 6 and liquid concentration sensor 7 are installed on the outside of housing 1, with their sensing ends sealed inside housing 1 and in direct contact with the immersion liquid layer. Liquid temperature sensor 6 is a corrosion-resistant Pt100 platinum resistance temperature sensor with a probe made of 316L stainless steel to monitor the immersion liquid temperature in real time. Liquid concentration sensor 7 is an online conductivity sensor with a titanium alloy electrode. It measures the conductivity of the solution and converts it into NaCl concentration in real time (target 50g / L±5g / L). The signals from both sensors are connected to the control system for closed-loop control of immersion liquid parameters. The sensing ends of liquid temperature sensor 6 and liquid concentration sensor 7 are inserted into housing 1 and sealed by laser welding. The welded positions are then acid-washed and passivated.

[0027] The spraying device 8 is located on the outside of the housing 1 and is used to spray salt spray into the housing 1; Specifically: The spraying device 8 includes a second pump 81 fixed to the outside of the base frame 14, a main pipe 82 with one end connected and fixed to the outlet of the second pump 81, a branch pipe 83 with one end connected and fixed to the other end of the main pipe 82, and a nozzle 84 connected and fixed to the other end of the branch pipe 83; the second pump 81 is a corrosion-resistant magnetic pump that draws 5% NaCl solution from the external soaking solution (storage tank). Multiple sets of branch pipes 83 are provided, with one end of each set evenly connected to the other end of the main pipe 82. The other ends of the multiple sets of branch pipes 83 are evenly distributed at the top inside the outer casing 1 to ensure uniform salt spray diffusion. The nozzle 84 is made of titanium alloy (with a preferred orifice diameter of 0.5-1.0 mm) to atomize the salt water into micron-sized particles. During spraying, the salt spray is sprayed upwards and then naturally diffuses and settles, avoiding direct spraying onto the surface of the test specimen. like Figure 3 As shown, multiple sets of test specimens are evenly distributed with spacing. The branch pipes 83 are fixed at the bottom of the outer shell 1 and inserted upwards. The multiple sets of branch pipes 83 and multiple sets of test specimens are evenly distributed in the outer shell 1 with spacing to ensure the uniformity of spraying. The branch pipes 83 and the outer shell 1 can be fixed by welding. After welding, the position is then pickled and passivated.

[0028] Temperature and humidity sensor 9 and fog concentrator 10 are installed on the outside of housing 1 to monitor environmental parameters inside the chamber. The sensing end of temperature and humidity sensor 9 is sealed inside housing 1 and uses a corrosion-resistant integrated temperature and humidity probe. Fog concentrator 10 uses a laser scattering method salt spray concentration sensor, model DP-YWH6, whose sensing end is sealed inside housing 1 to monitor the salt spray concentration in the air in real time. The sensor housing has a protection rating of at least IP65 and can work for a long time in a high salt spray environment. The sensing ends of temperature and humidity sensor 9 and fog concentrator 10 are inserted into housing 1 and sealed by laser welding. The welded area is then acid-washed and passivated.

[0029] Ventilation device 11 is installed on the outside of housing 1 to realize air circulation and ventilation inside the box; The ventilation device 11 includes two sets of ventilation components symmetrically arranged on the left and right sides of the outer casing 1 and a fan 114 connected to one set of ventilation components; The ventilation assembly includes a manifold 111, an air duct 112 fixedly connected to one end of the manifold 111, and a first air valve 113 connected and installed between the manifolds 111. The air duct 112 is provided in multiple sets, one end of which is evenly connected to one end of the manifold 111. The other ends of the multiple sets of air ducts 112 are evenly distributed outside the outer shell 1 and are fixedly connected to the inside of the outer shell 1, forming multi-point air supply and return. The fan 114 is a corrosion-resistant centrifugal fan with an impeller made of 316L stainless steel. When running, the fan 114 drives air to be sent into the outer casing 1 from one side of the ventilation component, flows through the test area and returns from the other side of the ventilation component, forming a closed loop.

[0030] The heating device 12 and the cooling device 13 are connected to the ventilation device 11 and are used to heat or cool the circulating air. The heat extraction device 12 includes a first shut-off valve 121 connected to and installed between manifolds 111, a first connecting pipe 122 fixedly connected to and installed between manifolds 111, and a second shut-off valve 123 connected to and installed between the first connecting pipes 122. The first connecting pipe 122 is connected to an external heat source (such as heat flow generated by an electric heater in a duct). Cooling device 13 includes a third shut-off valve 131 connected to and installed between manifolds 111, a second connecting pipe 132 fixedly connected to and installed between manifolds 111, and a fourth shut-off valve 133 connected to and installed between the second connecting pipes 132. The second connecting pipe 132 is connected to an external cold source (such as the evaporator or antifreeze circulation system of a refrigeration system). The heat extraction device 12 and the cooling device 13 are arranged in sequence and are farther away from the air duct 112 than the fan 114, such as Figures 1-4As shown, to ensure independent supply of cooling and heating and prevent circulation disorder, by controlling the opening and closing of each shut-off valve (first shut-off valve 121, second shut-off valve 123, third shut-off valve 131 and fourth shut-off valve 133), heat or cold can be selectively introduced to heat or cool the circulating air, so as to achieve precise control of the temperature inside the box.

[0031] The base frame 14 is fixedly installed at the bottom of the outer shell 1. The manifold 111 is also fixed to the outer side of the top of the base frame 14 to improve stability. It can be welded from 316L stainless steel profiles and is used to support the entire device. The compression tester 15 is installed on the outside of the base frame 14 (the compression tester 15 is an existing equipment product, which can be CN202210506032.3 proposed in the background art). After the specimen completes the environmental simulation of a predetermined number of cycles, it is taken out and placed on the compression tester 15 for crush test to obtain the final compressive strength data. The outer side of frame 1 is also equipped with a controller (not shown in the figure) for connecting to an external power source. This controller is a PLC controller, which connects to the electrical components and controls their opening and closing.

[0032] The work process is as follows: Preparation stage: Open the door cover 21 through the opening and closing device 2, put the concrete specimen into the outer shell 1, close the door cover 21, press the sealing gasket with the insertion ring 24 and the ring groove 23, and lock it with the fastener 26; Initial setup: The control system sets the test parameters, including the number of cycles, temperature and time at each stage, etc. The liquid addition device 3 is started, injecting (5%) NaCl solution into the soaking tank until the liquid level sensor 4 detects the predetermined depth. The liquid temperature sensor 6 and the liquid concentration sensor 7 monitor the temperature and concentration of the soaking solution. Salt spray wetting stage: Spray device 8 is started, the second pump 81 atomizes the salt water through nozzle 84 and sprays it out. The salt spray naturally diffuses and settles on the surface of the specimen and the soaking water tank. Temperature and humidity sensor 9 monitors the temperature and humidity in the chamber, and mist concentrator 10 monitors the concentration of salt spray in the air. The required treatment time is continuously set during this stage. Low-temperature freezing stage: The spray device 8 stops, the third shut-off valve 131 and the fourth shut-off valve 133 of the cooling device 13 open, the second pipe 132 introduces the cold source to cool the circulating air, the fan 114 runs at high speed to send cold air into the outer shell 1, so that the temperature inside the box drops to the set low temperature. The liquid temperature sensor 6 monitors the cooling or even freezing process of the soaking liquid. The required processing time is continuously set during this stage.

[0033] Drying and Concentration Stage: Cooling device 13 is closed, and the first shut-off valve 121 and the second shut-off valve 123 of heating device 12 are opened. The first pipe 122 introduces a heat source (such as the heat flow generated by the air duct electric heater) to heat the circulating air. The fan 114 runs and sends the hot air into the outer shell 1, raising the temperature inside the chamber to the set drying temperature. At the same time, the air valve of the ventilation device 11 is opened to remove moisture. The water in the soaking solution evaporates, and the concentration increases. The liquid concentration sensor 7 monitors the concentration in real time. When the concentration is too high, the control system starts the pure water branch of the liquid replenishment device 3 to automatically replenish water and dilute to maintain the concentration. This stage continues for the set processing time.

[0034] Cycling and Monitoring: The system automatically repeats the salt spray wetting stage, the low-temperature freezing stage, and the drying and concentration stage, and completes the preset number of cycles. Throughout the process, all sensor data (liquid level, liquid temperature, liquid concentration, air temperature and humidity, and air salt spray concentration) are recorded and stored by the storage component of the PLC controller. The liquid level sensor 4 monitors the liquid level. When the liquid level is too low, the liquid replenishing device 3 is activated to replenish the liquid. When the liquid level is too high, the drain valve 5 is opened to slowly drain the liquid and maintain it within the set range.

[0035] After completing the preset number of cycles (e.g., 10 times), the system pauses and prompts the operator to remove a specimen, clean the surface deposits, and then perform pretreatment using ultrasonic testing, record the wave velocity changes, and assess the accumulation of internal damage. Endpoint test: The specimen is then placed on the compressive strength detector 15 for direct compressive strength test to obtain strength data. The correlation analysis between the endpoint wave velocity and the endpoint strength is performed to establish a dedicated strength measurement curve.

[0036] The control method of this invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A device for testing the compressive strength of concrete under low temperature and high salt spray conditions, characterized in that, include; shell; The opening and closing device installed on the outer casing is used to take the concrete block to be tested into the outer casing when the casing is opened, and to seal the outer casing when the casing is closed; A liquid filling device is installed on the outer casing. The output end of the liquid filling device is sealed and inserted into the outer casing to add soaking liquid to the inside of the outer casing to form a liquid layer and add conditioning liquid. A liquid level sensor mounted on the outside of the housing is used to sense the thickness of the liquid layer; A drain valve is installed at the bottom of the housing, with one end of the drain valve sealed and connected to the inside of the housing for draining liquid to lower the liquid level; The liquid temperature sensor and liquid concentration sensor are installed on the outside of the housing. The sensing ends of the liquid temperature sensor and liquid concentration sensor are sealed and penetrate into the housing and contact the liquid layer to detect it. A spraying device is installed on the outside of the housing, with its output end sealed inside the housing and positioned above the concrete block, for spraying salt spray into the housing. The temperature and humidity sensor and the fog concentrator are installed on the outside of the housing. The sensing end of the temperature and humidity sensor is sealed and penetrates into the housing to detect the inside of the housing. The sensing end of the fog concentrator is sealed and penetrates into the housing to detect salt spray inside the housing. A ventilation device is installed on the outside of the housing, the ventilation device has an output and an input end and is connected to the inside of the housing for ventilation; A heating device and a cooling device are connected to the ventilation device. The heating device heats the input end of the ventilation device to raise the temperature inside the outer casing, and the cooling device cools the input end of the ventilation device to lower the temperature inside the outer casing. It also includes a pressure detector fixed to the bottom of the housing and mounted on the outside of the housing.

2. The device for testing the compressive strength of concrete under low temperature and high salt spray conditions according to claim 1, characterized in that, The opening and closing device includes a door cover, a viewing window fixed on the door cover, a port on the housing, and a disassembly assembly disposed between the door cover and the housing for sealing and opening the port.

3. The device for testing the compressive strength of concrete under low temperature and high salt spray conditions according to claim 2, characterized in that, The assembly includes an annular groove on the outside of the housing, a retaining ring fixed on the door cover, a fixing hole that penetrates the door cover and is embedded in the housing, and a fastener that connects to the fixing hole to fix the door cover to the housing. A sealing pad is attached to the inside of the annular groove, and the retaining ring is inserted into the annular groove and pressed tightly against the sealing pad.

4. The device for testing the compressive strength of concrete under low temperature and high salt spray conditions according to claim 1, characterized in that, The liquid filling device includes a first pump and an outlet pipe and an inlet pipe that are respectively connected and fixed at its outlet and inlet ends. The inlet pipe is a Y-shaped pipe, with one end connected and fixed to the first pump and the other two ends connected and installed with switch valves.

5. The device for testing the compressive strength of concrete under low temperature and high salt spray conditions according to claim 1, characterized in that, The spraying device includes a second pump fixed to the outside of the base frame, a main pipe with one end connected to the outlet of the second pump, a branch pipe with one end connected to the other end of the main pipe, and a nozzle connected to the other end of the branch pipe.

6. The device for testing the compressive strength of concrete under low temperature and high salt spray conditions according to claim 1, characterized in that, The branch pipes are provided in multiple groups, with one end of each group evenly distributed at the other end of the branch pipe, and the other end of each group of branch pipes is evenly distributed inside the outer casing.

7. The device for testing the compressive strength of concrete under low temperature and high salt spray conditions according to claim 1, characterized in that, The ventilation device includes two sets of ventilation components symmetrically arranged on the left and right sides of the outer casing, and a fan connected to one set of ventilation components. The ventilation components are connected to the inside of the outer casing. When the fan is running, air is blown from one set of ventilation components through the inside of the outer casing to the other set of ventilation components.

8. The device for testing the compressive strength of concrete under low temperature and high salt spray conditions according to claim 7, characterized in that, The ventilation assembly includes a manifold, a manifold fixedly connected to an air duct at one end, and a first air valve installed between the manifolds. The air ducts are provided in multiple sets, with one end of each set evenly distributed at one end of the manifold, and the other ends of the multiple sets of air ducts evenly distributed outside the outer shell and fixedly connected to the inside of the outer shell.

9. The device for testing the compressive strength of concrete under low temperature and high salt spray conditions according to claim 8, characterized in that, The heat extraction device includes a first shut-off valve connected and installed between manifolds, a first connecting pipe fixed in connection with the manifolds, and a second shut-off valve connected and installed between the first connecting pipes.

10. The device for testing the compressive strength of concrete under low temperature and high salt spray conditions according to claim 9, characterized in that, The cooling device includes a third shut-off valve connected to and installed between the manifolds, a second connecting pipe fixed to and connected to the manifolds, and a fourth shut-off valve connected to and installed between the second connecting pipes. The heating device and the cooling device are arranged in sequence and are farther away from the air duct than the fan.

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