Concrete shrinkage test device

Abstract

The utility model discloses a concrete shrinkage test device which comprises a box body and a movable frame, side grooves are formed in the lower ends of the left side wall and the right side wall of the box body, inserting plates are fixedly connected to the two ends of the movable frame, the inserting plates are movably inserted into the inner sides of the side grooves, and two second electric push rods are fixedly connected between the movable frame and the outer surface of the box body. The surface of the box body at the opening of the side groove on one side is fixedly connected with a draft fan; a heating plate is fixedly connected to the inner right side wall of the box body, a humidifier is arranged on the outer side of the box body, and a pipeline of the humidifier penetrates through the side wall of the box body and communicates with the interior of the box body; according to the concrete shrinkage degree testing device, a closed environment is arranged, and the temperature and the humidity of air in the box body are changed by the humidifier and the heating plate so as to simulate different environments, so that the concrete shrinkage degree is detected under various conditions, and the testing efficiency and the testing accuracy of the device are improved.

Description

Technical Field

[0001] This utility model relates to the field of concrete testing technology, specifically a concrete shrinkage testing device. Background Technology

[0002] Concrete is affected by various factors during construction, such as temperature changes, wetting and drying cycles, and load effects. These factors can all cause shrinkage deformation in concrete. Shrinkage deformation not only affects the stability and durability of concrete structures but may also lead to cracks, thus impacting the overall quality and safety of the project.

[0003] The main purpose of concrete shrinkage testing is to evaluate the shrinkage performance of concrete under different conditions, in order to determine the shrinkage coefficient of concrete and predict the shrinkage deformation of concrete during actual use. Patent No. CN 218995378U discloses a concrete shrinkage testing device. Through the setting of electric telescopic rod, slide, slider, limiting hole and limiting rod, the drawer seat can be pushed out of the testing cabinet by the electric telescopic rod, so that the testing personnel can quickly take out the concrete block. Through the setting of support rod, fastening screw, threaded hole, track opening and limiting block, the fastening screw can be loosened to loosen the support plate, so as to move the micrometer up and down, thereby adjusting the position and height of the micrometer. This facilitates the deformation testing of concrete blocks of different sizes and specifications, effectively increasing the practicality of the testing cabinet.

[0004] However, during use, the device is in direct contact with the external environment, making the test data susceptible to fluctuations in temperature and humidity, thus affecting the accuracy and reliability of the measurements. Furthermore, the device lacks the function of actively controlling the test environment, making it unable to simulate the complex temperature and humidity conditions faced by concrete in actual engineering projects. This hinders a comprehensive assessment of the shrinkage characteristics of concrete under different climatic conditions, limiting the practical value of the test results. Therefore, a new technical solution is needed to address this issue. Utility Model Content

[0005] The purpose of this invention is to provide a concrete shrinkage testing device that solves the problem mentioned in the background art that the test data is easily affected by external temperature and humidity fluctuations, affecting the measurement accuracy and reliability, and cannot simulate the complex temperature and humidity conditions faced by concrete in actual engineering.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a concrete shrinkage testing device, comprising a box and a movable frame. Side grooves are provided at the lower ends of the left and right side walls of the box. Insert plates are fixedly connected to both ends of the movable frame, and the insert plates are movably inserted into the inner side of the side grooves. Two No. 2 electric actuators are fixedly connected between the movable frame and the outer surface of the box. An exhaust fan is fixedly connected to the surface of the box at one of the openings of the side groove. A heating plate is fixedly connected to the inner right side wall of the box. A humidifier is provided on the outer side of the box, and the humidifier's pipe passes through the side wall of the box and communicates with the interior of the box.

[0007] In this technical solution, a humidifier and a heating plate are installed simultaneously. After activation, the humidifier and heating plate can change the temperature and humidity inside the chamber, thereby simulating different environments. This allows the concrete to be tested under different external conditions, improving the efficiency and accuracy of the device's testing. After the test is completed, the second electric actuator extends, moving the movable frame and insert plate outward to expose the side slot. At this time, the exhaust fan can then ventilate the inside of the chamber, restoring the temperature and humidity of the air to normal, facilitating the testing of the next concrete block and improving the testing efficiency of the device.

[0008] Preferably, two support frames are fixedly connected to the top opening edge of the box body, and a first electric actuator is fixedly connected to the top of the support frame. The telescopic end of the first electric actuator passes through the support frame and is fixedly connected to the top plate.

[0009] Preferably, a micrometer is fixedly connected to the top of the top plate, and the measuring head of the micrometer is located below the top plate.

[0010] Preferably, the inner bottom surface of the box is provided with a placement platform, and the surface of the placement platform is parallel to the ground.

[0011] Preferably, a temperature and humidity sensor is fixedly connected to the top plate surface on one side of the micrometer, and the probe of the temperature and humidity sensor is located below the top plate.

[0012] Preferably, a power supply box is fixedly connected to the outer wall of the box corresponding to the horizontal position of the heating plate.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model sets the interior of the chamber as a sealable environment and simultaneously installs a humidifier and a heating plate. After the humidifier and heating plate are activated, they can change the temperature and humidity of the interior space of the chamber, thereby simulating different environments and enabling concrete to be tested under different external conditions, thus improving the efficiency and accuracy of the device's testing.

[0015] 2. This utility model sets side slots on the left and right sides of the box body, and sets up a movable frame and two side plates that are inserted into the side slots. After the test is completed, the No. 2 electric push rod is activated and extended, which drives the movable frame and the insert plates to move outward. At this time, the side slots will be exposed. Then the exhaust fan will ventilate the inside of the box body, allowing the temperature and humidity of the air to return to normal, which is convenient for the next concrete block test and improves the test efficiency of the device. Attached Figure Description

[0016] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0017] Figure 1 This is an overall view of the present invention;

[0018] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the movable frame structure of this utility model.

[0020] In the diagram: 1. Cabinet body; 101. Cabinet door; 2. Support frame; 3. Electric actuator No. 1; 4. Top plate; 5. Digit meter; 6. Placement platform; 7. Humidifier; 8. Heating plate; 9. Power supply box; 10. Side groove; 11. Movable frame; 12. Electric actuator No. 2; 13. Insert plate; 14. Exhaust fan; 15. Temperature and humidity sensor. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description will further elaborate on them in conjunction with specific embodiments.

[0022] A concrete shrinkage testing apparatus, see Figures 1 to 3 The device includes a housing 1 and a movable frame 11. The lower ends of the left and right side walls of the housing 1 are provided with side grooves 10. Both ends of the movable frame 11 are fixedly connected with insert plates 13, which are movably inserted into the inner side of the side grooves 10. Two No. 2 electric push rods 12 are fixedly connected between the movable frame 11 and the outer surface of the housing 1. An exhaust fan 14 is fixedly connected to the surface of the housing 1 at the opening of one of the side grooves 10. A heating plate 8 is fixedly connected to the inner right side wall of the housing 1. A humidifier 7 is provided on the outer side of the housing 1. The pipe of the humidifier 7 passes through the side wall of the housing 1 and communicates with the inside of the housing 1. When the humidifier 7 is turned on, it sprays water mist onto the inside of the housing 1 to increase the humidity of the air inside the housing 1.

[0023] Specifically, such as Figure 1As shown, two support frames 2 are fixedly connected to the top opening edge of the box 1. A first electric actuator 3 is fixedly connected to the top of the support frame 2. The telescopic end of the first electric actuator 3 passes through the support frame 2 and is fixedly connected to the top plate 4. A sealing strip is provided on the outer edge of the top plate 4, so the gap between the top plate 4 and the box 1 can be filled to keep it sealed and ensure the stability of the simulated environment. Similarly, the box door 101 of the box 1 can also remain sealed after being closed. After the concrete block is placed, the top plate 4 is lowered first so that the detection head of the micrometer 5 contacts the concrete block. Then the box door 101 is closed, so that the interior of the box 1 becomes a closed environment.

[0024] It is worth noting that, such as Figure 2 As shown, a micrometer gauge 5 is fixedly connected to the top of the top plate 4. The measuring head of the micrometer gauge 5 is located below the top plate 4. When the first electric actuator 3 is activated, it drives the top plate 4 to rise and fall, so that the measuring head of the micrometer gauge 5 can contact the concrete downwards, which is suitable for concrete of different sizes.

[0025] It is worth noting that, such as Figure 2 As shown, the inner bottom surface of the box 1 is provided with a placement platform 6. The surface of the placement platform 6 is parallel to the ground, so it can remain stable when placing concrete. In addition, the surface of the placement platform 6 is relatively rough and has a large friction, so the concrete will not easily slip.

[0026] It is worth noting that, such as Figure 2 As shown, a temperature and humidity sensor 15 is fixedly connected to the top plate 4 on one side of the micrometer 5. The probe of the temperature and humidity sensor 15 is located below the top plate 4. The temperature and humidity sensor 15 can detect the temperature and humidity of the air inside the box 1 in real time, so that the staff can start the humidifier 7 and the heating plate 8 for adjustment.

[0027] It is worth noting that, such as Figure 2 As shown, a power supply box 9 is fixedly connected to the outer wall of the box 1 corresponding to the horizontal position of the heating plate 8. The heating plate 8 is made of a material with a high thermal conductivity and has several electric heating wires inside. When powered on, it will generate heat to heat the internal space of the box 1. Due to its high power, a dedicated power supply box 9 is set up to supply power and control its opening and closing to ensure its stable operation.

[0028] Working principle: Open the chamber door 101 and place the concrete test block to be tested on the bottom placement platform 6 inside the chamber 1 to ensure the test block is stable. The first electric actuator 3 drives the top plate 4 to descend, so that the micrometer 5 probe contacts the surface of the test block. Then close the chamber door 101 to form a sealed test environment. According to the test requirements, start the humidifier 7 to spray water mist into the chamber to increase the humidity, or turn on the heating plate 8 to heat the air inside the chamber to increase the temperature. The temperature and humidity sensor 15 monitors the environmental data inside the chamber in real time and feeds it back to the staff, so as to adjust the working status of the humidifier 7 and the heating plate 8 in a timely manner until the preset temperature and humidity conditions are reached. Under constant or gradually changing environmental conditions, the micrometer 5 continuously records the longitudinal shrinkage deformation of the concrete specimen. The data is collected and analyzed by external equipment to obtain the curve of concrete shrinkage rate over time. After the test is completed, the second electric actuator 12 is activated to push the movable frame 11 outward, so that the insert plate 13 is disengaged from the side groove 10, the opening of the side groove 10 is exposed, the exhaust fan 14 is run to exhaust the air in the chamber and introduce external air, quickly restore the temperature and humidity in the chamber to normal, which facilitates the replacement of specimens and continuous testing.

[0029] In addition, all components designed in this utility model are general standard parts or components known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. Those skilled in the art can fully implement them, so there is no need to elaborate. The content protected by this utility model does not involve improvements to the internal structure and method.

[0030] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. A concrete shrinkage testing device comprising a housing (1) and a movable frame (11), characterised in that: The left and right side walls of the box (1) are provided with side grooves (10) at the lower end, both ends of the movable frame (11) are fixedly connected with plug-in plates (13), the plug-in plates (13) are movably inserted into the inner side of the side grooves (10), two No. 2 electric push rods (12) are fixedly connected between the movable frame (11) and the outer surface of the box (1), and the surface of the box (1) at the opening of the side groove (10) on one side is fixedly connected with an exhaust fan (14); the inner right side wall of the box (1) is fixedly connected with a heating plate (8), and the outer side of the box (1) is provided with a humidifier (7); the pipeline of the humidifier (7) penetrates through the side wall of the box (1) and communicates with the inside of the box (1).

2. A concrete shrinkage testing device according to claim 1, wherein: The top end of the box (1) is fixedly connected with two support frames (2), the top end of the support frame (2) is fixedly connected with a No. 1 electric push rod (3), and the telescopic end of the No. 1 electric push rod (3) penetrates through the support frame (2) and is fixedly connected with a top plate (4).

3. A concrete shrinkage testing device according to claim 2, wherein: The top end of the top plate (4) is fixedly connected with a micrometer gauge (5), and the detection head of the micrometer gauge (5) is located below the top plate (4).

4. The concrete shrinkage testing device of claim 1, wherein: The inner bottom surface of the box (1) is provided with a placing table (6), and the surface of the placing table (6) is parallel to the ground.

5. The concrete shrinkage testing device of claim 3, wherein: The surface of the top plate (4) on one side of the micrometer gauge (5) is fixedly connected with a temperature and humidity sensor (15), and the probe of the temperature and humidity sensor (15) is located below the top plate (4).

6. The concrete shrinkage testing device of claim 1, wherein: The outer side wall of the box (1) corresponding to the horizontal position of the heating plate (8) is fixedly connected with a power supply box (9).

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