A multifunctional integrated concrete test block curing box

Abstract

The present invention discloses a multifunctional integrated concrete block curing box, comprising a box body, an LED display, a disc heating pipe, a liquid level sensor, a connecting glass tube, a cooling fan, a frame plate, a PLC programmable controller, and a steam generator. The box body is provided with a large box cover on the top, a drain valve and a connecting glass tube on the left side of the box body, a disc heating pipe on the bottom of the box body, a frame plate on the top of the frame plate support legs, a thermocouple sensor and a temperature and humidity sensor on the box body, a controller protection box on the back of the box body, and the LED display, disc heating pipe, liquid level sensor, cooling fan, thermocouple sensor, temperature and humidity sensor, timer module, and steam generator are electrically connected to the PLC programmable controller. The present invention integrates the three traditional curing modes of standard curing, steam curing, and boiling water curing, achieving the integration of different curing functions and providing great convenience for researchers in the field of concrete materials.

Description

Technical field

[0001] The invention relates to a multifunctional integrated concrete test block curing box, belonging to the technical field of concrete curing equipment. [Background Technology]

[0002] Global concrete research often requires a series of tests on concrete specimens, including strength, impermeability, durability, and freeze-thaw cycle resistance. These specimens must be cured under certain conditions to achieve their designed strength before subsequent testing can be performed. Curing concrete specimens primarily aims to create conditions for the cement to fully hydrate, accelerating the hardening of the concrete so that it reaches the designed strength within the specified timeframe. Furthermore, curing prevents abnormal shrinkage and cracking of the concrete after it is formed, which can be caused by natural factors such as dryness and cold weather.

[0003] Curing temperature significantly influences the rate of early concrete performance development. Generally speaking, the higher the curing temperature, the faster the strength development. Research has shown that when the temperature falls below a certain limit, the cement hydration reaction ceases and the concrete's strength development stops. This temperature is typically around -10°C. In fact, at temperatures below 0°C, the water in the concrete begins to freeze, which can lead to freeze damage. Furthermore, the environment in which early concrete is exposed to insufficient humidity can cause significant water evaporation. This dehydration of the test specimens hinders further cement hydration. Furthermore, the concrete's drying shrinkage increases, subjecting the concrete to shrinkage-induced tensile stresses at low strength, leading to early cracking. To ensure optimal performance of the prepared concrete and prevent abnormal shrinkage and cracking caused by factors such as drying and freezing, standard curing, steam curing, and boiling water curing are currently the most commonly used curing methods in laboratories.

[0004] Standard curing refers to curing concrete specimens in an environment with a temperature of 20±3°C and a relative humidity of over 90%. When a standard curing room is unavailable, concrete specimens can be cured in still water at a temperature of 20±3°C. Laboratories generally have dedicated standard curing rooms. Although these rooms have advantages such as large curing capacity and low cost, they cannot meet the needs of experiments due to time constraints and different research requirements. Currently, concrete strength evaluation is mainly based on the 28d standard curing strength, but its disadvantage is that it takes a long time and is greatly affected by fluctuations in the molding and curing environment, which lags in the guidance of concrete mix ratio adjustments.

[0005] Steam curing is a curing method that uses steam as a heat medium to accelerate the hardening of concrete. Laboratories typically perform steam curing by placing test pieces in a specialized steam box and then heating water to generate steam. Steam curing ensures the required temperature and humidity during the initial hydration process, accelerating cement hydration and rapidly achieving the standard 28-day curing strength. While steam curing speeds up cement hydration compared to standard curing, the curing equipment suffers from limited functionality, irrational internal configuration, and a low level of intelligence, creating certain inconveniences in practical application.

[0006] Boiling water curing involves placing concrete specimens in a water tank. The water is first heated to 45°C at a heating rate of 5°C / min and held at this temperature for 12 hours. The water is then boiled at a heating rate of 11°C / min and held at this temperature for 6 hours before being cooled to room temperature at a cooling rate of 6.7°C / h. Compared to standard curing and steam curing, boiling water curing significantly shortens the time it takes for concrete specimens to reach 28-day strength. However, using existing curing equipment for boiling water curing often requires controlling the heating and cooling rates of the water. Conventional curing chambers cannot manually control the heating and cooling rates, and heating often has a fixed heating power that cannot be manually adjusted, making them inadequate for controlled tests with varying heating rates. Cooling is typically done naturally with the lid open, but the cooling rate varies with the seasons, which can affect the results of longer tests. [Summary of the invention]

[0007] The purpose of the present invention is to address the defects and shortcomings of existing equipment, integrate the three curing methods of standard curing, steam curing and boiling water curing, and provide a multifunctional integrated concrete specimen curing box. Different curing methods can be selected according to different curing needs. It is fully functional, safe and convenient.

[0008] In order to solve the problems existing in the background technology, the present invention proposes a multifunctional integrated concrete test block curing box, including a handle, a small box cover, a large box cover, a box body, a box body bracket, an LED display screen, a controller protection box, a disc heating tube, a liquid level sensor, a drain valve, a connecting glass tube, a cooling fan, a shelf support leg, a shelf, a shelf clamping leg, a shelf handle, a thermocouple sensor, a temperature and humidity sensor, a timer module, a PLC programmable controller, a steam generator, a steam overflow pipe, a water suction pipe, and a liquid overflow hole. The box body is a hollow rectangular structure with an open top, and box body brackets are arranged around the bottom ring of the box body to ensure the overall stability. A large box cover is arranged on the top of the box to play a shielding and heat preservation role, a small box cover is arranged at the center of the upper surface of the large box cover, and a cooling fan is arranged at the lower part of the small box cover at the center of the large box cover to control the cooling rate. Symmetrically distributed handles are arranged on both sides of the upper surface of the large box cover to facilitate opening the large box cover. An LED display screen is arranged on the front of the box. The left side of the box is provided with a drain valve and a connecting glass tube, and the drain valve and the connecting glass tube are both connected to the interior of the box, the inner wall of the box is provided with a shelf leg symmetrically distributed front and back, and the upper surface of the shelf leg is provided with a shelf, the bottom of the box is provided with a disc heating tube, and a shelf support leg is provided between the bottom disc heating tubes in the box, and a shelf is provided on the top of the shelf support leg. The shelf is provided with a liquid overflow hole running through the upper and lower parts to ensure that the upper and lower environments of the shelf are connected, a thermocouple sensor and a temperature and humidity sensor are provided close to the rear side wall of the box, and a controller protection box is provided on the back of the box, and a timer module, a PLC programmable controller and a steam generator are arranged inside the controller protection box, and the steam generator is connected to the interior of the box through a steam overflow pipe and a water suction pipe, and the LED display, disc heating tube, liquid level sensor, cooling fan, thermocouple sensor, temperature and humidity sensor, timer module and steam generator are electrically connected to the PLC programmable controller respectively.

[0009] A maintenance mode setting panel is provided on the left side of the LED display screen. The three maintenance modes are: standard maintenance, steam maintenance and boiling water maintenance. Users can select different maintenance modes according to their needs. A temperature and humidity display and setting panel is provided in the middle of the LED display screen. Users can set different temperatures and humidity according to their needs, and can also set the heat preservation and moisturizing mode. A time display and setting panel is provided on the right side of the LED display screen. Users can set different maintenance times according to their needs.

[0010] The liquid level sensor is used to detect the water level inside the box to prevent the disc heating tube from drying out due to the water level being too low.

[0011] As a preferred technical solution of the present invention, the rear side where the large box lid contacts the box body is hinged by a hinge, so when it needs to be opened, the large box lid can be simply lifted backward to facilitate opening; and a sealing ring is provided at the position where the large box lid contacts the box body to isolate the external environment and ensure that the internal environment is relatively stable.

[0012] As a preferred technical solution of the present invention, the liquid level sensor adopts a CQ33-N21PBU2 capacitive normally closed liquid level sensor.

[0013] As a preferred technical solution of the present invention, the cooling fan adopts a DA12025B12L cooling fan, which has low cost and good heat dissipation effect.

[0014] As a preferred technical solution of the present invention, the thermocouple sensor adopts a compression spring couple-E type thermocouple sensor, which is used to measure the water temperature in the boiling water curing mode, and its temperature measurement range is 0-400°C.

[0015] As a preferred technical solution of the present invention, the temperature and humidity sensor adopts SHT20 temperature and humidity sensor, which is used to measure the temperature and humidity in the box under standard and steam curing modes. The working medium temperature is: -40~125℃, accuracy: ±0.3℃; working environment humidity: 0-100%RH, accuracy: ±3%.

[0016] As a preferred technical solution of the present invention, the PLC programmable controller adopts the CPU224XP-AC / DC / RLY module, which can support up to 7 expansion modules.

[0017] As a preferred technical solution of the present invention, the bottom outlet of the steam overflow pipe is located in the middle of the box body, and the bottom outlet of the water suction pipe is located at the bottom of the box body, ensuring that the steam generator can smoothly absorb water from the box body and ensure the release of steam.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: through the LCD display and PLC programmable controller, traditional separate curing modes such as standard curing, steam curing, and boiling water curing are integrated into a multifunctional curing box, and by selecting different curing modes, the curing function is integrated, avoiding the inconvenience of selecting different curing equipment according to different curing modes when curing concrete; by setting a cooling fan and a PLC programmable controller, the cooling rate of the temperature in the control box can be controlled, effectively avoiding the disadvantage of the traditional boiling water curing method that the natural cooling rate is uncontrollable and the test result has poor accuracy; by setting a double-layer shelf, more concrete test blocks can be placed in the curing box, and the shelf is provided with a liquid overflow hole, so that the water body and the concrete test block can be in close contact under the boiling water curing mode; the setting of the bottom shelf separates the disc heating pipe from the concrete test block to prevent the pressure and Bumps and collisions cause damage to the disc heating tube, extending the service life of the curing box; by setting a drain valve, the water in the curing box can be easily discharged, effectively avoiding the deposition of scale at the bottom of the box, and further preventing the corrosion of the box and disc heating tube by chlorides and sulfates in the scale, which is very beneficial to improving the service life of the curing box; by setting a connecting glass tube and a capacitive normally closed liquid level sensor, the water level in the box can be checked in time without opening the curing box cover. When the water level is too low, the capacitive normally closed liquid level sensor will make a dripping sound to remind the user to add water, avoiding the situation where the water boils dry when no one is around, thereby protecting the curing equipment; by setting a thermocouple sensor and a temperature and humidity sensor, the temperature and humidity in the curing box can be monitored at any time, and the temperature and humidity in the box can be automatically adjusted through the PLC programmable controller according to the set curing mode.

Brief Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the front three-dimensional structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the back three-dimensional structure of the present invention.

[0021] Figure 3 It is a right side sectional view of the present invention.

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the internal structure of the present invention.

[0023] Figure 5 It is a structural schematic diagram of the cooling fan of the present invention.

[0024] Figure 6 It is a schematic diagram of the three-dimensional structure of the shelf of the present invention.

[0025] Figure 7 Schematic diagram of the circuit principle of the present invention.

[0026] Explanation of the accompanying reference numerals: 1. handle, 2. small box cover, 3. large box cover, 4. box body, 5. box body bracket, 6. LED display, 7. controller protection box, 8. disc heating tube, 9. liquid level sensor, 10. drain valve, 11 connecting glass tube, 12. cooling fan, 13. shelf support leg, 14. shelf, 15. shelf clamping leg, 16. shelf handle, 17. thermocouple sensor, 18. temperature and humidity sensor, 19. timer module, 20. PLC programmable controller, 21. steam generator, 22. steam overflow pipe, 23. water suction pipe, 24. liquid overflow hole. [Specific implementation method]

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "left", "center", "right", "up" and "down" indicate directions or positions based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0029] See also Figures 1 to 7, this specific embodiment adopts the following technical solutions: a multifunctional integrated concrete test block curing box, comprising a handle 1, a small box cover 2, a large box cover 3, a box body 4, a box body bracket 5, an LED display 6, a controller protection box 7, a disc heating tube 8, a liquid level sensor 9, a drain valve 10, a connecting glass tube 11, a cooling fan 12, a shelf support leg 13, a shelf 14, a shelf clamping leg 15, a shelf handle 16, a thermocouple sensor 17, a temperature and humidity sensor 18, a timer module 19, a PLC programmable controller 20, a steam generator 21, a steam overflow pipe 22, a water suction pipe 23, a liquid The box body 4 is a hollow rectangular parallelepiped structure with an open top. The box body 4 is provided with box brackets 5 around the bottom ring to ensure the stability of the whole. A large box cover 3 is provided on the top of the box body 4 to provide shielding and heat preservation. A small box cover 2 is provided at the center of the upper surface of the large box cover 3. A cooling fan 12 is provided at the lower part of the small box cover 2 at the center of the large box cover 3 to control the cooling rate. A symmetrically distributed handle 1 is provided on both sides of the upper surface of the large box cover 3 to facilitate opening the large box cover 3. An LED display screen 6 is provided on the front of the box body 4 and a There is a drain valve 10 and a communicating glass tube 11, which are both connected to the interior of the box body 4. The inner wall of the box body 4 is provided with a shelf plate leg 15 symmetrically distributed front and back, and a shelf plate 14 is provided on the upper surface of the shelf plate leg 15. The bottom of the box body 4 is provided with a disc heating tube 8, and a shelf plate support leg 13 is provided between the bottom disc heating tube 8 in the box body 4. A shelf plate 14 is provided on the top of the shelf plate support leg 13. The shelf plate 14 is provided with a liquid overflow hole 24 that runs through the upper and lower environments of the shelf plate 14 to ensure that the upper and lower environments of the shelf plate 14 are connected. The box body 4 is tightly closed. A thermocouple sensor 17 and a temperature and humidity sensor 18 are provided on the rear side wall. A controller protection box 7 is provided on the back of the box body 4. A timer module 19, a PLC programmable controller 20 and a steam generator 21 are provided inside the controller protection box 7. The steam generator 21 is connected to the interior of the box body 4 through a steam overflow pipe 22 and a water suction pipe 23. The LED display screen 6, disc heating tube 8, liquid level sensor 9, cooling fan 12, thermocouple sensor 17, temperature and humidity sensor 18, timer module 19 and steam generator 21 are electrically connected to the PLC programmable controller 20 respectively.

[0030] A maintenance mode setting panel is set on the left side of the LED display screen 6. The three maintenance modes are: standard maintenance, steam maintenance and boiling water maintenance. Users can select different maintenance modes according to their needs; a temperature and humidity display and setting panel is set in the middle of the LED display screen 6. Users can set different temperatures and humidity according to their needs, and can also set the heat preservation and moisturizing mode; a time display and setting panel is set on the right side of the LED display screen 6. Users can set different maintenance times according to their needs.

[0031] The rear side where the large box cover 3 contacts the box body 4 is hinged by a hinge. When it needs to be opened, the large box cover 3 can be opened by simply lifting it backwards. A sealing ring is provided at the contact position between the large box cover 3 and the box body 4 to isolate the external environment and ensure that the internal environment is relatively stable.

[0032] The liquid level sensor 9 is a CQ33-N21PBU2 capacitive normally closed liquid level sensor.

[0033] The cooling fan 12 is a DA12025B12L cooling fan, which has low cost and good heat dissipation effect.

[0034] The thermocouple sensor 17 is a compression spring-coupled E-type thermocouple sensor, which is used to measure the water temperature in the boiling water curing mode, and its temperature measurement range is 0-400°C.

[0035] The temperature and humidity sensor 18 adopts SHT20 type temperature and humidity sensor, which is used to measure the temperature and humidity in the box 4 in standard and steam curing modes, working medium temperature: -40~125℃, accuracy: ±0.3℃; working environment humidity: 0-100%RH, accuracy: ±3%.

[0036] The PLC programmable controller 20 adopts the CPU224XP-AC / DC / RLY module and can support up to 7 expansion modules.

[0037] The bottom outlet of the steam overflow pipe 22 is located in the middle of the box body 4, and the bottom outlet of the water suction pipe 23 is located at the bottom of the box body 4, ensuring that the steam generator 21 can smoothly absorb water from the box body 4 and ensure the release of steam.

[0038] The present invention operates as follows: First, a certain amount of water is added to the housing 4, and the water level is confirmed to be appropriate via the connecting glass tube 11. Then, the power is turned on, and the PLC programmable controller 20 controls the heating of the disc heating tube 8. During the heat preservation mode, if the water temperature drops, the thermocouple sensor 8 inside the housing 4 promptly feeds back the water temperature to the PLC programmable controller 20, which then controls the disc heating tube 8 to heat the water inside the housing 4, thereby achieving the purpose of heat preservation. The provision of a capacitive normally closed liquid level sensor 9 prevents the water inside the housing 4 from evaporating and causing the water level to drop too low due to prolonged heating. If the water level drops too low, the liquid level sensor 9 feeds back a signal to the PLC programmable controller 20, which then controls the disc heating tube 8 to stop heating. A steam generator 21 is also provided within the housing 4 for standard and steam curing. Water inside the housing 4 enters the steam generator 21 through a water intake 23, where it generates steam and discharges it into the housing 4. In addition, a thermocouple sensor 17 is provided to monitor the humidity inside the box 4 at any time. When the humidity inside the box 4 is insufficient, the thermocouple sensor 17 feeds back the humidity inside the box 4 to the PLC programmable controller 20, and then the steam generator 21 absorbs water to generate steam to replenish the humidity inside the box 4.

[0039] In addition to the double-layer shelves 14 set inside the box body 4, more concrete test blocks can be placed. The first layer of shelves 14 is set above the disc heating tube 8, and the two maintain a certain distance. The second layer of shelves 14 is set in the middle of the box body 4 and supported by the shelf legs 15. The test blocks are placed on the upper part of the shelves 14, and multiple rows of liquid overflow holes 24 are opened on the shelves 14 to facilitate the contact between the water body and the disc heating tube 8. Multiple rows of shelf support legs 13 are set under the first layer of shelves 14. This arrangement method not only provides support for the concrete test blocks, but also separates the disc heating tube 8 from the concrete test blocks, preventing the disc heating tube 8 from being damaged due to pressure and collision of the test blocks, thereby extending the service life of the curing box.

[0040] When the interior of the box 4 needs to be cooled, the small box cover 2 is opened, and the cooling time and cut-off temperature are set via the LED display 6 and the PLC programmable controller 20, thereby controlling the power of the cooling fan 12 and achieving the desired cooling rate. After the curing is complete, the drain valve 10 can be opened directly to drain the water from the box 4, facilitating timely water replacement and cleaning of internal scale. This effectively prevents scale deposits from forming on the bottom of the box, further preventing corrosion of the box and the coiled heating tubes by chlorides and sulfates present in the scale, and significantly increasing the service life of the curing box.

[0041] 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 embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This description is provided for clarity only. Those skilled in the art should consider this specification as a whole. The technical solutions in the various embodiments may also be appropriately combined to form other embodiments that are understandable to those skilled in the art.

Claims

1. A multifunctional integrated concrete block curing box, characterized in that: The utility model comprises: a handle, a small box cover, a large box cover, a box body, a box body bracket, an LED display screen, a controller protection box, a disc heating tube, a liquid level sensor, a drain valve, a connecting glass tube, a cooling fan, a shelf support leg, a shelf plate, a shelf plate clamping leg, a shelf plate handle, a thermocouple sensor, a temperature and humidity sensor, a timer module, a PLC programmable controller, a steam generator, a steam overflow pipe, a water suction pipe, and a liquid overflow hole. The box body is a hollow rectangular structure with an open top. Box brackets are arranged around the bottom ring of the box body to ensure the overall stability. A large box cover is arranged on the top of the box body to play a shielding and heat preservation role. A small box cover is arranged at the center of the upper surface of the large box cover. A cooling fan is arranged at the lower part of the small box cover at the center of the large box cover to control the cooling rate. There are symmetrically distributed handles on both sides of the upper surface of the large box cover to facilitate opening the large box cover. The front of the box body is provided with an LED display screen. The left side of the box body is provided with a drain valve and a connecting glass tube. The drain valve and the communicating glass tube are both connected to the interior of the box body, the inner wall of the box body is provided with a shelf plate leg which is symmetrically distributed front and back, the upper surface of the shelf plate leg is provided with a shelf plate, the bottom of the box body is provided with a disc heating tube, a shelf plate supporting leg is provided between the bottom disc heating tube of the box body, a shelf plate is provided on the top of the shelf plate supporting leg, the shelf plate is provided with a liquid overflow hole which passes through from top to bottom to ensure that the upper and lower environments of the shelf plate are connected, a thermocouple sensor and a temperature and humidity sensor are provided close to the rear side wall of the box body, a controller protection box is provided on the back of the box body, a timer module, a PLC programmable controller and a steam generator are provided inside the controller protection box, the steam generator is connected to the interior of the box body through a steam overflow pipe and a water suction pipe, the LED display screen, the disc heating tube, the liquid level sensor, the cooling fan, the thermocouple sensor, the temperature and humidity sensor, the timer module and the steam generator are electrically connected to the PLC programmable controller respectively; A maintenance mode setting panel is provided on the left side of the LED display screen, and the three maintenance modes are: standard maintenance, steam maintenance and boiling water maintenance; a temperature and humidity display and setting panel is provided in the middle of the LED display screen; and a time display and setting panel is provided on the right side of the LED display screen.

2. The multifunctional integrated concrete block curing box according to claim 1, characterized in that: The rear side position where the large box cover contacts the box body is hinged by a hinge, and a sealing ring is provided at the position where the large box cover contacts the box body.

3. The multifunctional integrated concrete block curing box according to claim 1, characterized in that: The liquid level sensor adopts CQ33-N21PBU2 capacitive normally closed liquid level sensor.

4. The multifunctional integrated concrete block curing box according to claim 1, characterized in that: The cooling fan is a DA12025B12L cooling fan.

5. The multifunctional integrated concrete block curing box according to claim 1, characterized in that: The thermocouple sensor adopts a compression spring couple-E type thermocouple sensor, which is used to measure the water temperature in the boiling water curing mode, and its temperature measurement range is 0-400°C.

6. The multifunctional integrated concrete block curing box according to claim 1, characterized in that: The temperature and humidity sensor is an SHT20 type temperature and humidity sensor, which is used to measure the temperature and humidity in the box under standard and steam curing modes.

7. The multifunctional integrated concrete block curing box according to claim 1, characterized in that: The PLC programmable controller adopts CPU224XP-AC / DC / RLY module.

8. The multifunctional integrated concrete block curing box according to claim 1, characterized in that: The bottom outlet of the steam overflow pipe is located in the middle of the box body, and the bottom outlet of the water suction pipe is located at the bottom of the box body.

9. The multifunctional integrated concrete block curing box according to claim 1 or 3, characterized in that: The liquid level sensor is used to detect the water level inside the box to prevent the disc heating tube from drying out due to the water level being too low.

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