A concrete shrinkage testing device
Patent Information
- Application Number
- CN202522179094.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-15
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2035-10-15
AI Technical Summary
[0004]针对上述问题，本实用新型提出一种混凝土收缩试验装置，已解决现有技术中利用夹持板对混凝土进行对中处理，不便对混凝土进行移动对中的问题
[0011]本实用新型的有益效果为：通过在底板的内部设置有调节机构，利用调节机构的第一转轮、螺纹杆、螺纹套、限位杆和限位套之间的相互配合，可带动放置板进行移动，进而带动混凝土块进行移动，其能大幅降低操作难度，无需人工直接推移混凝土块，仅通过移动板体即可便捷调整试件位置，减少人工触碰对试件的干扰，避免试件因外力作用出现损伤或移位，同时，配合限位杆和限位套可严格限制板体仅沿横向移动，确保调整方向精准可控，助力试件轴线与测量轴线高效对齐，有效减少基准偏差；通过在前侧板的内侧设置有移动机构，利用移动机构的螺纹槽、螺杆、第二转轮、转块、导向孔和导向杆之间的相互配合，可灵活适配不同长度混凝土试件，无需更换专用夹具，拓宽装置适用范围，能快速调整千分表与试件端面的接触状态，无需拆解重新安装，简化预压校准流程，提升操作效率，还可精准控制千分表移动距离，确保测头轴线与试件轴线稳定对齐，减少对中偏差，避免因位置固定导致的测量误差，保障收缩数据准确性。
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Figure CN224803066U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of concrete testing technology, and in particular to a concrete shrinkage testing device. Background Technology
[0002] Concrete, as the most widely used structural material in construction engineering, experiences volume shrinkage (such as drying shrinkage and autogenous shrinkage) during setting, hardening, and service, which is a key factor leading to structural cracking and reduced durability. Therefore, accurately determining the shrinkage rate through concrete shrinkage testing is of great significance for optimizing concrete mix proportions, developing crack-resistant construction plans, and ensuring the safety of engineering structures. Related testing equipment must strictly adhere to industry standards to ensure measurement accuracy and data reliability.
[0003] In concrete shrinkage tests, the current mainstream centering methods mostly rely on manual operation, such as directly pushing the concrete block to adjust its position, or using fixed blocks and manual fine-tuning screws for positioning. However, it is inconvenient to use a laterally moving plate to drive the concrete block for centering. When manually pushing the specimen, uneven force can easily cause the specimen to tilt or be locally damaged, especially for concrete specimens with low early strength, which may cause surface cracking or internal structural damage, affecting the authenticity of the test results. Moreover, manual operation relies on experience and judgment, making it difficult to ensure the uniformity of the centering benchmark for the same group of parallel specimens, which can easily lead to operational differences and result in large dispersion of parallel test data. Although some devices attempt to use fixed blocks to assist centering, the fixed position of the blocks cannot flexibly adapt to concrete specimens of different sizes, thus limiting their applicability. When adjusting with manual fine-tuning screws, the position needs to be repeatedly calibrated, which is cumbersome, time-consuming, and reduces test efficiency. Furthermore, regardless of manual pushing, fixing of blocks, or manual screw fine-tuning, it is difficult to accurately control the centering direction, which can easily lead to the specimen axis deviating from the measurement axis, resulting in oblique measurement error or local contact error. This causes the measured shrinkage value to deviate from the true value, affecting the accuracy of the test data. Therefore, this utility model proposes a concrete shrinkage test device to solve the above problems. Utility Model Content
[0004] To address the aforementioned problems, this utility model proposes a concrete shrinkage testing device, which solves the problem in the prior art where clamping plates are used to center the concrete, making it inconvenient to move and center the concrete.
[0005] To achieve the purpose of this utility model, the utility model is implemented through the following technical solution: a concrete shrinkage testing device, including a base plate, a front side plate installed on one side of the top of the base plate, a moving mechanism provided on the inner side of the front side plate, a movable plate installed at one end of the moving mechanism, a dial indicator installed on the inner side of the movable plate, a rear side plate installed on the other side of the top of the base plate, a fixed pin installed on the inner side of the rear side plate, an adjustment mechanism provided inside the base plate, a placement plate installed above the adjustment mechanism, and a sliding plate that can slide longitudinally and be fixed above the placement plate; The adjustment mechanism includes a first rotating wheel, a threaded rod, a threaded sleeve, and a limiting structure. The first rotating wheel is installed at the front end of the base plate. The threaded rod is installed inside the base plate. One end of the first rotating wheel is connected to one end of the threaded rod. A threaded sleeve is provided on the outer wall of the threaded rod. The top end of the threaded sleeve is connected to the bottom end of the placement plate.
[0006] A further improvement is that the limiting structure includes a limiting rod and a limiting sleeve. The limiting rod is installed inside the base plate, and the outer side wall of the limiting rod is provided with a limiting sleeve. The top end of the limiting sleeve is connected to the bottom end of the placement plate.
[0007] A further improvement is that the cross-section of the limiting rod is smaller than the cross-section of the limiting sleeve, and the limiting rod and the limiting sleeve form a sliding structure.
[0008] A further improvement is that the moving mechanism includes a threaded groove, a screw, a second rotating wheel, a rotating block, and a guide structure. The threaded groove is opened through both ends of the front side plate, and the screw is installed through the inside of the threaded groove. The second rotating wheel is installed at one end of the screw, and the rotating block is rotatably installed at the other end of the second rotating wheel. One end of the rotating block is connected to one end of the movable plate.
[0009] A further improvement is that the guiding structure includes a guide hole and a guide rod. The guide hole is opened through both ends of the front side plate, and the guide rod is installed through the inside of the guide hole. One end of the guide rod is connected to one end of the movable plate.
[0010] A further improvement is that two guide rods are provided at one end of the movable plate, and the two guide rods are symmetrically distributed about the central axis of the movable plate.
[0011] The beneficial effects of this utility model are as follows: By setting an adjustment mechanism inside the base plate, the interaction between the first rotating wheel, threaded rod, threaded sleeve, limiting rod, and limiting sleeve of the adjustment mechanism can drive the placement plate to move, thereby driving the concrete block to move. This greatly reduces the difficulty of operation, eliminating the need for manual pushing of the concrete block. The position of the specimen can be easily adjusted simply by moving the plate, reducing interference from manual touching of the specimen and preventing damage or displacement of the specimen due to external forces. At the same time, the limiting rod and limiting sleeve can strictly limit the plate to move only laterally, ensuring precise and controllable adjustment direction and helping to align the specimen axis with the measurement axis. Efficient alignment effectively reduces reference deviation. A moving mechanism is installed on the inner side of the front plate. Utilizing the interplay between the moving mechanism's threaded groove, screw, second rotating wheel, rotating block, guide hole, and guide rod, it can flexibly adapt to concrete specimens of different lengths without requiring replacement of special clamps, thus broadening the device's applicability. It can quickly adjust the contact state between the dial indicator and the specimen end face without disassembly and reinstallation, simplifying the pre-compression calibration process and improving operational efficiency. It can also precisely control the dial indicator's movement distance, ensuring stable alignment between the probe axis and the specimen axis, reducing centering deviation, avoiding measurement errors caused by fixed positions, and guaranteeing the accuracy of shrinkage data. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall structure of the dial indicator of this utility model; Figure 3 This is a schematic diagram of the overall structure of the adjustment mechanism of this utility model; Figure 4 This is a schematic diagram of the overall structure of the moving mechanism of this utility model.
[0013] The components are: 1. Base plate; 2. Front side plate; 3. Movable plate; 4. Dial indicator; 5. Rear side plate; 6. Fixed pin; 7. Placement plate; 8. First rotating wheel; 9. Threaded rod; 10. Threaded sleeve; 11. Limiting rod; 12. Limiting sleeve; 13. Threaded groove; 14. Screw; 15. Second rotating wheel; 16. Rotating block; 17. Guide hole; 18. Guide rod. Detailed Implementation
[0014] To deepen the understanding of this utility model, the following detailed description will be provided in conjunction with embodiments. These embodiments are only used to explain this utility model and do not constitute a limitation on the scope of protection of this utility model.
[0015] according to Figure 1 , 2As shown in Figures 3 and 4, this embodiment proposes a concrete shrinkage testing device, including a base plate 1. A front side plate 2 is installed on one side of the top of the base plate 1. A moving mechanism is provided on the inner side of the front side plate 2. A movable plate 3 is installed at one end of the moving mechanism. A dial indicator 4 is installed on the inner side of the movable plate 3. A rear side plate 5 is installed on the other side of the top of the base plate 1. A fixing pin 6 is installed on the inner side of the rear side plate 5. An adjustment mechanism is provided inside the base plate 1. A placement plate 7 is installed above the adjustment mechanism. A sliding plate that can slide longitudinally and be fixed is provided above the placement plate 7.
[0016] The adjusting mechanism includes a first rotating wheel 8, a threaded rod 9, a threaded sleeve 10, and a limiting structure. The first rotating wheel 8 is installed at the front end of the base plate 1. The threaded rod 9 is installed inside the base plate 1. One end of the first rotating wheel 8 is connected to one end of the threaded rod 9. A threaded sleeve 10 is provided on the outer wall of the threaded rod 9. The top end of the threaded sleeve 10 is connected to the bottom end of the placement plate 7. In use, rotating the first rotating wheel 8 drives the threaded rod 9 to rotate, thus moving the threaded sleeve 10. Under the limiting of the limiting rod 11 and the limiting sleeve 12, the threaded sleeve 10 drives the placement plate 7 to move, thus moving the concrete block and placing the concrete block... Move the concrete block to the appropriate position so that it is aligned with the fixed pin 6 and the dial indicator 4. Then, slide the sliding plate to bring one end of the concrete block into contact with one end of the fixed pin 6, and fix the position of the sliding plate and the placement plate 7. This greatly reduces the difficulty of operation, eliminating the need for manual pushing of the concrete block. The position of the specimen can be easily adjusted by simply moving the plate, reducing interference from manual touching of the specimen and preventing damage or displacement of the specimen due to external forces. At the same time, with the help of the limiting rod 11 and the limiting sleeve 12, the plate can be strictly limited to moving only in the lateral direction, ensuring that the adjustment direction is accurate and controllable, helping to efficiently align the specimen axis with the measurement axis, and effectively reducing the reference deviation.
[0017] The limiting structure includes a limiting rod 11 and a limiting sleeve 12. The limiting rod 11 is installed inside the base plate 1, and the limiting sleeve 12 is provided on the outer side wall of the limiting rod 11. The top end of the limiting sleeve 12 is connected to the bottom end of the placement plate 7. The cross-section of the limiting rod 11 is smaller than the cross-section of the limiting sleeve 12. The limiting rod 11 and the limiting sleeve 12 form a sliding structure. In use, the mutual cooperation between the limiting rod 11 and the limiting sleeve 12 can limit the movement of the placement plate 7, making the placement plate 7 more stable when moving.
[0018] The moving mechanism includes a threaded groove 13, a screw 14, a second rotating wheel 15, a rotating block 16, and a guide structure. The threaded groove 13 extends through both ends of the front side plate 2. The screw 14 is disposed through the threaded groove 13. The second rotating wheel 15 is mounted on one end of the screw 14, and the rotating block 16 is rotatably mounted on the other end of the second rotating wheel 15. One end of the rotating block 16 is connected to one end of the movable plate 3. In use, rotating the second rotating wheel 15 drives the screw 14 to rotate, causing the screw 14 to move inside the threaded groove 13, thereby moving along the guide hole 17 and the guide rod 18. Under the limit position, the screw 14 drives the movable plate 3 to move, which in turn drives the dial indicator 4 to move, so that one end of the dial indicator 4 contacts one end of the concrete block. This allows for flexible adaptation to concrete specimens of different lengths without the need to replace special clamps, thus broadening the applicability of the device. It can quickly adjust the contact state between the dial indicator 4 and the specimen end face without disassembly and reinstallation, simplifying the pre-compression calibration process and improving operational efficiency. It can also precisely control the moving distance of the dial indicator 4, ensuring stable alignment between the probe axis and the specimen axis, reducing centering deviation, avoiding measurement errors caused by fixed positions, and ensuring the accuracy of shrinkage data.
[0019] The guiding structure includes a guide hole 17 and a guide rod 18. The guide hole 17 is opened through both ends of the front side plate 2. The guide rod 18 is installed through the guide hole 17. One end of the guide rod 18 is connected to one end of the movable plate 3. Two guide rods 18 are provided at one end of the movable plate 3. The two guide rods 18 are symmetrically distributed about the central axis of the movable plate 3. In use, the mutual cooperation between the guide hole 17 and the guide rod 18 can guide the movable plate 3 when it moves, making the movable plate 3 more stable when it moves.
[0020] Working principle: The operator first places the concrete block on top of the slide plate of the placement plate 7. Then, the first rotating wheel 8 is rotated, which drives the threaded rod 9 to rotate, thus moving the threaded sleeve 10. Under the limitation of the limiting rod 11 and the limiting sleeve 12, the threaded sleeve 10 drives the placement plate 7 to move, thus moving the concrete block. The concrete block is moved to the appropriate position so that it is aligned with the fixed pin 6 and the dial indicator 4. Then, the sliding plate is slid to bring one end of the concrete block into contact with one end of the fixed pin 6, fixing the position of the sliding plate and the placement plate 7. Next, the second rotating wheel 15 is rotated, which drives the screw 14 to rotate, causing the screw 14 to move inside the threaded groove 13. Under the limitation of the guide hole 17 and the guide rod 18, the screw 14 drives the movable plate 3 to move, thus moving the dial indicator 4. One end of the dial indicator 4 contacts one end of the concrete block, and the dial indicator 4 is used to detect the shrinkage of the concrete block.
[0021] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A concrete shrinkage testing device, comprising a base plate (1), characterized in that: A front side plate (2) is installed on one side of the top of the base plate (1). A moving mechanism is provided on the inner side of the front side plate (2). A movable plate (3) is installed at one end of the moving mechanism. A dial indicator (4) is installed on the inner side of the movable plate (3). A rear side plate (5) is installed on the other side of the top of the base plate (1). A fixing pin (6) is installed on the inner side of the rear side plate (5). An adjustment mechanism is provided inside the base plate (1). A placement plate (7) is installed above the adjustment mechanism. A slide plate that can slide longitudinally and be fixed is provided above the placement plate (7). The adjustment mechanism includes a first rotating wheel (8), a threaded rod (9), a threaded sleeve (10), and a limiting structure. The first rotating wheel (8) is installed at the front end of the base plate (1). The threaded rod (9) is installed inside the base plate (1). One end of the first rotating wheel (8) is connected to one end of the threaded rod (9). The outer side wall of the threaded rod (9) is provided with a threaded sleeve (10). The top end of the threaded sleeve (10) is connected to the bottom end of the placement plate (7).
2. The concrete shrinkage testing device according to claim 1, characterized in that: The limiting structure includes a limiting rod (11) and a limiting sleeve (12). The limiting rod (11) is installed inside the base plate (1). The outer side wall of the limiting rod (11) is provided with a limiting sleeve (12). The top end of the limiting sleeve (12) is connected to the bottom end of the placement plate (7).
3. The concrete shrinkage testing device according to claim 2, characterized in that: The cross-section of the limiting rod (11) is smaller than the cross-section of the limiting sleeve (12), and the limiting rod (11) and the limiting sleeve (12) form a sliding structure.
4. The concrete shrinkage testing device according to claim 1, characterized in that: The moving mechanism includes a threaded groove (13), a screw (14), a second rotating wheel (15), a rotating block (16), and a guide structure. The threaded groove (13) is opened through both ends of the front side plate (2). The screw (14) is installed through the inside of the threaded groove (13). The second rotating wheel (15) is installed at one end of the screw (14). The rotating block (16) is rotatably installed at the other end of the second rotating wheel (15). One end of the rotating block (16) is connected to one end of the movable plate (3).
5. The concrete shrinkage testing device according to claim 4, characterized in that: The guide structure includes a guide hole (17) and a guide rod (18). The guide hole (17) is opened through both ends of the front side plate (2). The guide rod (18) is installed through the inside of the guide hole (17). One end of the guide rod (18) is connected to one end of the movable plate (3).
6. The concrete shrinkage testing device according to claim 5, characterized in that: Two guide rods (18) are provided at one end of the movable plate (3), and the two guide rods (18) are symmetrically distributed about the central axis of the movable plate (3).