Early crack resistance test device for concrete

Abstract

The utility model relates to the technical field of building test detector auxiliary devices, and discloses a concrete early-stage crack resistance test device which comprises a second platform, a wind collecting mechanism comprises a wind collecting cover, and the outside of the wind collecting cover is fixedly connected to the top of the second platform. A wind scooper is fixedly connected to the outer part of the wind collecting cover, namely the side far away from the fourth platform, a wind shield is fixedly connected to the outer part of the wind scooper, namely the side far away from the outer part of the wind collecting cover, a lead screw is fixedly connected to the top of the driving mechanism, and a concrete test block mold is fixedly connected to the inner part of the wind collecting cover. According to the concrete early-stage crack resistance test device, the precision and the reliability of concrete early-stage crack resistance tests are remarkably improved, the accuracy and the repeatability of test results are ensured, meanwhile, the error risk caused by manual operation is reduced, the test efficiency is improved, the human resource cost is saved, and meanwhile the safety and the comfort of the test process are improved.

Description

Technical Field

[0001] This utility model relates to the field of auxiliary devices for building testing instruments, and in particular to a test device for early crack resistance of concrete. Background Technology

[0002] An early-stage crack resistance testing device for concrete is an instrument used to test the early-stage crack resistance of concrete specimens under constrained conditions. By simulating the constraints and environmental conditions experienced by concrete in actual engineering projects, it evaluates the crack resistance of concrete, providing important data for the research and development, quality control, and engineering applications of concrete materials. This allows for the optimization of concrete mix proportions and the improvement of the durability and safety of concrete structures.

[0003] A search revealed Chinese Patent Publication No. CN218524477U, which discloses a testing device for the early crack resistance performance of concrete. The device includes a workbench with a mounting base fixed to its bottom and a placement platform on its top, with a support frame also fixed to the top. During use, this device can gradually increase the pressure in the concrete crack resistance test, ensuring a consistent rate of pressure increase in each test. It eliminates the need for repeated manual adjustments, thus improving the efficiency of the early crack resistance performance test. The device also includes a positioning mechanism; the connecting pad on the outer side of the mounting plate allows one side of the anti-slip plate to adhere to the outer side of the corresponding concrete block, achieving auxiliary positioning and ensuring accurate placement of the concrete block, further facilitating the early crack resistance performance test.

[0004] In practical use, the aforementioned device, with its connecting pad on the outer side of the mounting plate, allows one side of the anti-slip plate to adhere to the outer side of the corresponding concrete block, ensuring accurate placement of the concrete block. However, wind speed, as a crucial factor affecting the rate of moisture evaporation and the development of drying shrinkage stress on the concrete surface, plays a key role in the accuracy and comparability of test results. However, some existing testing devices fail to provide stable and uniform wind speed conditions, resulting in inconsistent wind speeds at different locations on the specimen surface. This affects the formation and development of cracks, reducing the reliability of test results. Therefore, this paper proposes an asphalt pavement maintenance paver to address these issues and a concrete early-stage crack resistance testing device. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a concrete early crack resistance test device, which aims to improve the problem that some existing devices cannot improve the test accuracy and wind speed consistency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A concrete early crack resistance test device includes a second platform, a lifting mechanism at the bottom of the second platform, an air collection mechanism at the top of the second platform, a third platform slidably connected to the outer side of the second platform, a fourth platform slidably connected to the top of the third platform, and a driving mechanism at the top of the fourth platform.

[0008] The air collection mechanism includes an air collection hood, the outside of which is fixedly connected to the top of the second platform. An air guide hood is fixedly connected to the outside of the air collection hood, i.e., the side away from the fourth platform. A baffle plate is fixedly connected to the outside of the air guide hood, i.e., the side away from the outside of the air collection hood. An adjustment component for adjustment is fixedly connected to the bottom of the third platform. A lead screw is fixedly connected to the top of the drive mechanism. A long strip-shaped airflow multiplier is fixedly connected to the top of the lead screw. Two second slide grooves are fixedly connected to the outside of the air collection hood. Air hood sliders are slidably connected inside the two second slide grooves. A concrete test block mold is fixedly connected inside the air collection hood.

[0009] The above technical solution involves the following: the second and third platforms are located on the same plane and are fixedly connected or integrally formed; a fourth platform is set above the third platform, and a first slide groove is set on the third platform. The fourth platform is slidably set in the first slide groove via a slider. A long strip-shaped airflow multiplier is set on the fourth platform, and a slide rail is set on the fourth platform. The long strip-shaped airflow multiplier cooperates with the slide rail via a slider. An air collection hood is operably mounted on the second platform, covering the mold. The long strip-shaped airflow multiplier blows airflow into the air collection hood. An air hood slider is set at the air inlet of the air collection hood, and the air hood slider can slide in the second slide groove, which is fixedly set on the second platform for easy fixation of the air collection hood. The outlet of the air collection hood is connected to a guide hood to guide the blown airflow and prevent the airflow from directly blowing and affecting the experiments of other testing equipment. A baffle is hinged at the upper end of the guide hood to further prevent the airflow from directly blowing.

[0010] As a further description of the above technical solution:

[0011] The drive mechanism includes a drive motor, which is externally fixedly connected to the outside of the fourth platform, i.e., the side away from the air collector shroud. Multiple slide rails are fixedly connected to the top of the fourth platform, and the outer side of each slide rail is fixedly connected to the output end of the drive motor.

[0012] The above technical solution involves a drive motor fixedly mounted on the fourth platform, with a lead screw fixedly mounted on the output shaft of the drive motor. The lead screw is threadedly engaged with the slider below the elongated airflow multiplier. Both ends of the lead screw are rotatably fixed on the fourth platform via bearing seats, which is used to drive the elongated airflow multiplier to move back and forth and adjust the air inlet position.

[0013] As a further description of the above technical solution:

[0014] The adjustment assembly includes a bracket, the bottom of which is fixedly connected to the bottom of the third platform, a second hydraulic cylinder is fixedly connected to the top of the bracket, a handle is fixedly connected to the top of the air collector, and a plurality of first sliding grooves are fixedly connected to the top of the third platform.

[0015] The above technical solution involves fixing a second hydraulic cylinder under the third platform via a bracket. The telescopic rod of the second hydraulic cylinder is fixedly connected to the bottom surface of the fourth platform to adjust the height of the fourth platform and the height of the elongated airflow multiplier. At the same time, the fourth platform can remain stable under the action of the first chute.

[0016] As a further description of the above technical solution:

[0017] The second hydraulic cylinder is fixedly connected to the bottom of the fourth platform. The second hydraulic cylinder can drive the fourth platform to rise, thereby adjusting the height of the elongated airflow multiplier.

[0018] The above technical solution enables the fourth platform to move up or down precisely through its telescopic movement, thereby achieving flexible adjustment of the height of the long strip airflow multiplier and ensuring that the airflow multiplier can be accurately positioned at the required height according to the test requirements.

[0019] As a further description of the above technical solution:

[0020] The elongated airflow multiplier, in conjunction with the slide rail, causes the drive motor to rotate the lead screw, thereby adjusting the position of the elongated airflow multiplier.

[0021] The above technical solution enables precise control of the airflow multiplier position, ensuring its optimal position under different test conditions and improving the accuracy and reliability of the test.

[0022] As a further description of the above technical solution:

[0023] The lifting mechanism includes a plurality of first hydraulic cylinders, the output ends of the plurality of first hydraulic cylinders are fixedly connected to the bottom periphery of the second platform, and the bottom of the plurality of first hydraulic cylinders is fixedly connected to the first platform;

[0024] The above technical solution allows for precise adjustment of the height of the second platform by extending and retracting the first hydraulic cylinder, thereby adjusting the position of the concrete test block to meet the testing requirements at different heights, thus improving the flexibility and applicability of the device.

[0025] As a further description of the above technical solution:

[0026] The exterior of the first platform is at the bottom of the second platform, and the bottom of the first platform is fixedly connected with wheels;

[0027] The above technical solution provides a stable foundation for the entire device. At the same time, the wheels at the bottom of the first platform enable the device to move quickly and be positioned between different test locations, thus improving the device's flexibility and efficiency.

[0028] As a further description of the above technical solution:

[0029] When the multiple first hydraulic cylinders extend and retract, they can drive the second platform to adjust its height.

[0030] Through the above technical solution, the second platform can maintain a horizontal state by means of the synchronous extension and retraction of the hydraulic cylinder, avoiding the tilting or positional displacement of the test block caused by height adjustment, ensuring that the test block is subjected to uniform force during the test, and reducing the error introduced by equipment factors.

[0031] This utility model has the following beneficial effects:

[0032] In this invention, the coordinated action of the first hydraulic cylinder, drive motor, lead screw and slide rail can precisely control the airflow parameters and automated operation process, significantly improving the accuracy and reliability of the early crack resistance test of concrete, ensuring the accuracy and repeatability of the test results, reducing the error risk caused by manual operation, improving test efficiency, saving human resource costs, and enhancing the safety and comfort of the test process. Attached Figure Description

[0033] Figure 1 This is a three-dimensional schematic diagram of a concrete early crack resistance test device proposed in this utility model;

[0034] Figure 2 This is a schematic diagram of the third platform of the concrete early crack resistance test device proposed in this utility model;

[0035] Figure 3 This is a schematic diagram of the structure of a concrete test block mold for an early-stage crack resistance test device for concrete proposed in this utility model;

[0036] Figure 4 This is a schematic diagram of the fourth platform of the concrete early crack resistance test device proposed in this utility model;

[0037] Figure 5 This is a schematic diagram of the first chute of a concrete early crack resistance test device proposed in this utility model.

[0038] Legend:

[0039] 1. Second platform; 2. Air collection mechanism; 21. Handle; 22. Air guide hood; 23. Wind baffle; 24. Air collection hood; 25. Support; 26. Second hydraulic cylinder; 27. First slide rail; 28. Air hood slider; 29. ​​Second slide rail; 210. Concrete test block mold; 211. Lead screw; 212. Long strip airflow multiplier; 3. Lifting mechanism; 31. First platform; 32. Traveling wheel; 33. First hydraulic cylinder; 4. Drive mechanism; 41. Drive motor; 42. Slide rail; 5. Fourth platform; 6. Third platform. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] Reference Figures 1 to 5 This utility model provides an embodiment of a concrete early crack resistance testing device, comprising a second platform 1 designed to provide good support. A lifting mechanism 3 is installed at the bottom of the second platform 1, comprising multiple first hydraulic cylinders 33 designed to provide good telescopic performance. The output ends of the multiple first hydraulic cylinders 33 are fixedly connected to the bottom perimeter of the second platform 1. A first platform 31 is fixedly connected to the bottom of the multiple first hydraulic cylinders 33, designed to provide good support for the first hydraulic cylinders 33 and a good support environment for the second platform 1. The exterior of the first platform 31 is located at the bottom of the second platform 1, and a traveling wheel 32 is fixedly connected to the bottom of the first platform 31, designed to facilitate the movement of the entire device. When the multiple first hydraulic cylinders 33 extend or retract, they can drive... The height of the second platform 1 is adjustable. The top of the second platform 1 is equipped with an air collection mechanism 2. The outer side of the second platform 1 is slidably connected to the third platform 6, which is designed to provide good support during processing. The top of the third platform 6 is slidably connected to the fourth platform 5, which is supported by the third platform 6 so that the fourth platform 5 can remain stable during processing. The top of the fourth platform 5 is equipped with a drive mechanism 4, which includes a drive motor 41, which is designed to provide good driving capability. The drive motor 41 is fixedly connected to the outside of the fourth platform 5, that is, the outside side away from the air collection hood 24. The top of the fourth platform 5 is fixedly connected to multiple slide rails 42, which are designed to provide good guiding capability. At the same time, the output end of the drive motor 41 is connected to one end of the middle slide rail 42, and the outer side of the slide rail 42 is fixedly connected to the output end of the drive motor 41.

[0042] The air collection mechanism 2 includes an air collection hood 24, which can evenly distribute airflow across the entire surface of the test block. The air collection hood 24 is fixedly connected to the top of the second platform 1. An air guide hood 22 is fixedly connected to the outside of the air collection hood 24, i.e., the side away from the fourth platform 5, which can smoothly guide the airflow from the air collection hood 24 to the external environment. A baffle 23 is fixedly connected to the outside of the air guide hood 22, i.e., the side away from the outside of the air collection hood 24, to prevent the airflow from directly blowing and interfering with other testing equipment or the test environment. An adjustment mechanism is fixedly connected to the bottom of the third platform 6. The adjustment assembly includes a bracket 25, designed to provide good protection and support. The bottom of the bracket 25 is fixedly connected to the bottom of the third platform 6, and the top of the bracket 25 is fixedly connected to a second hydraulic cylinder 26. The bracket 25 supports the second hydraulic cylinder 26, which is fixedly connected to the bottom of the fourth platform 5. The second hydraulic cylinder 26 can drive the fourth platform 5 to rise, thereby adjusting the height of the elongated airflow multiplier 212. The elongated airflow multiplier 212 is connected to the slide rail 4. 2. The drive motor 41 drives the lead screw 211 to rotate, thereby adjusting the position of the elongated airflow multiplier 212. The top of the air collecting hood 24 is fixedly connected to a handle 21, which is designed to facilitate pushing the device. The top of the third platform 6 is fixedly connected to multiple first sliding grooves 27, which are designed to provide good sliding ability. The second hydraulic cylinder 26 drives the fourth platform 5 to push upward, so that the second hydraulic cylinder 26 can provide good sliding space and prevent the fourth platform 5 from deviating during sliding. The top of the drive mechanism 4 is fixedly connected to There is a lead screw 211, which is designed to provide good guiding ability. A long strip-shaped airflow multiplier 212 is fixedly connected to the top of the lead screw 211. Two second slide grooves 29 are fixedly connected to the outer side of the air collecting hood 24. The second slide grooves 29 can provide good sliding space. The air hood slider 28 is slidably connected inside the two second slide grooves 29. The sliding space provided by the second slide grooves 29 allows the air hood slider 28 to slide smoothly. A concrete test block mold 210 is fixedly connected inside the air collecting hood 24, which is designed to be used to place concrete.

[0043] Specifically, in the early crack resistance test of concrete, concrete is first poured into the concrete specimen mold 210, and the mold is placed on the second platform 1. According to the test requirements, the height of the second platform 1 is adjusted by controlling the extension and retraction of the first hydraulic cylinder 33. Then, the air collection hood 24 is placed on the second platform 1, ensuring a tight fit to guarantee the concentration and stability of the airflow. The air collection hood 24 can be easily moved using its handle 21, allowing it to accurately cover the specimen. The drive motor 41 is started, and through the lead screw 211, it drives the elongated airflow multiplier 212 to move on the slide rail 42, thereby precisely adjusting the position of the elongated airflow multiplier 212 so that its outlet is aligned with a specific location on the concrete specimen. The height of the fourth platform 5 can be adjusted by extending and retracting the second hydraulic cylinder 26, thereby adjusting the height of the elongated airflow multiplier 212 to meet the requirements for the position and intensity of the airflow under different test conditions. The elongated airflow multiplier 212 pressurizes and accelerates the external airflow, then blows the high-speed airflow into the air collection hood 24 through its outlet. The air collection hood 24 evenly distributes the airflow across the entire surface of the test block, ensuring uniform airflow action. The air guide hood 22 guides the airflow exiting the air collection hood 24, smoothly directing it into the external environment. The wind deflector 23 further blocks and disperses the airflow, preventing direct airflow from interfering with other testing equipment or the test environment. During the test, by observing the state of the test block inside the air collection hood 24, the stress and crack development of the test block under the airflow can be directly understood. After the test, the drive motor 41 is turned off to stop the airflow supply. Then, the air collection hood 24, air guide hood 22, and wind deflector 23 are removed in sequence, and the concrete test block is taken out of the mold for subsequent data analysis and processing.

[0044] Working Principle: Before conducting the early crack resistance test of concrete, concrete is first poured into the concrete specimen mold 210 on the second platform 1, ensuring its precise positioning and stable placement. Next, by precisely controlling multiple first hydraulic cylinders 33, the second platform 1 achieves stable height adjustment, providing a suitable foundation for subsequent test operations. Then, the air collection hood 24 is securely placed on the second platform 1, tightly covering the mold to ensure efficient concentration and stable distribution of airflow. At this time, the air hood slider 28 at the air inlet of the air collection hood 24 slides flexibly in the second slide groove 29, facilitating quick and accurate fixation of the air collection hood 24 and ensuring its stability during the test. The drive mechanism 4 is activated, and the drive motor 41 operates stably. Through the threaded engagement between the lead screw 211 and the slider below the elongated airflow multiplier 212, the elongated airflow multiplier 212 is moved smoothly along the slide rail 42, precisely adjusting its position so that its air outlet is aligned with the designated area of ​​the concrete specimen, meeting the airflow requirements under different test conditions. Simultaneously, utilizing the telescopic function of the second hydraulic cylinder 26, the height of the fourth platform 5 is precisely adjusted, thereby flexibly adjusting the height position of the elongated airflow multiplier 212 to further optimize the airflow effect. The elongated airflow multiplier 212 efficiently pressurizes and accelerates the external airflow, then precisely blows the high-speed airflow into the air collection hood 24 through the outlet. The air collection hood 24 evenly and stably distributes the airflow across the entire surface of the test block, ensuring the test block receives comprehensive and uniform airflow action, realistically simulating actual working conditions. The airflow exiting the air collection hood 24, guided by the air guide hood 22, smoothly diffuses into the external environment. Throughout the experiment, it is recommended that operators clearly observe the real-time state of the test block under the airflow action through the transparent acrylic material of the air collection hood 24, air guide hood 22, and baffle 23, intuitively grasping the stress on the test block and crack development dynamics, providing strong support for the accurate collection and analysis of experimental data. After the test, the drive motor 41 was turned off in sequence to stop the airflow supply, and the components such as the air collection hood 24, air guide hood 22, and wind baffle 23 were removed in an orderly manner. Finally, the concrete test block was taken out of the mold to prepare for subsequent data analysis and processing.

[0045] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A test device for early crack resistance of concrete, comprising a second platform (1), characterized in that: The bottom of the second platform (1) is provided with a lifting mechanism (3), the top of the second platform (1) is provided with a wind gathering mechanism (2), the outer side of the second platform (1) is slidably connected to a third platform (6), the top of the third platform (6) is slidably connected to a fourth platform (5), and the top of the fourth platform (5) is provided with a driving mechanism (4). The air collection mechanism (2) includes an air collection hood (24), the outside of which is fixedly connected to the top of the second platform (1). An air guide hood (22) is fixedly connected to the outside of the air collection hood (24), i.e., the side away from the fourth platform (5). A baffle plate (23) is fixedly connected to the outside of the air guide hood (22), i.e., the side away from the air collection hood (24). An adjustment component for adjustment is fixedly connected to the bottom of the third platform (6). A lead screw (211) is fixedly connected to the top of the drive mechanism (4). A long strip-shaped airflow multiplier (212) is fixedly connected to the top of the lead screw (211). Two second slide grooves (29) are fixedly connected to the outside of the air collection hood (24). A wind hood slider (28) is slidably connected inside the two second slide grooves (29). A concrete test block mold (210) is fixedly connected inside the air collection hood (24).

2. The early-stage crack resistance test device for concrete according to claim 1, characterized in that: The drive mechanism (4) includes a drive motor (41), which is fixedly connected to the outside of the fourth platform (5), i.e., the side away from the air collector shroud (24). The top of the fourth platform (5) is fixedly connected to a plurality of slide rails (42), and the outer side of the slide rails (42) is fixedly connected to the output end of the drive motor (41).

3. The early-stage crack resistance test device for concrete according to claim 1, characterized in that: The adjustment assembly includes a bracket (25), the bottom of which is fixedly connected to the bottom of the third platform (6), the top of which is fixedly connected to a second hydraulic cylinder (26), the top of which is fixedly connected to a handle (21), and the top of which is fixedly connected to a plurality of first slide grooves (27).

4. The early-stage crack resistance test device for concrete according to claim 3, characterized in that: The second hydraulic cylinder (26) is fixedly connected to the bottom of the fourth platform (5). The second hydraulic cylinder (26) can drive the fourth platform (5) to rise, thereby adjusting the height of the elongated airflow multiplier (212).

5. The early-stage crack resistance test device for concrete according to claim 2, characterized in that: The elongated airflow multiplier (212) cooperates with the slide rail (42) to cause the drive motor (41) to drive the lead screw (211) to rotate, thereby adjusting the position of the elongated airflow multiplier (212).

6. The early-stage crack resistance test device for concrete according to claim 1, characterized in that: The lifting mechanism (3) includes a plurality of first hydraulic cylinders (33), the output ends of the plurality of first hydraulic cylinders (33) are fixedly connected to the bottom of the second platform (1) around the perimeter, and the bottom of the plurality of first hydraulic cylinders (33) is fixedly connected to the first platform (31).

7. The early-stage crack resistance test device for concrete according to claim 6, characterized in that: The exterior of the first platform (31) is at the bottom of the second platform (1), and the bottom of the first platform (31) is fixedly connected with a walking wheel (32).

8. The early-stage crack resistance test device for concrete according to claim 7, characterized in that: When the multiple first hydraulic cylinders (33) extend and retract, they can drive the second platform (1) to adjust its height.

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