Testing system for measuring shrinkage and expansion change rate of concrete

Abstract

According to the test system for measuring the shrinkage and expansion change rate of concrete, a double-thread adjusting bolt I and a double-thread adjusting bolt II are adjusted, and slide blocks arranged at the bottoms of a rectangular baffle, a fixed block I, a fixed block II and a convex baffle are matched with synchronous sliding of a slide rail I and a slide rail II; therefore, the distance between the rectangular baffle and the convex baffle is accurately adjusted to fix the concrete test block; the adjusting bolt is used for adjusting the relative position of the sleeve on the vertical rod, so that the displacement sensor is used for monitoring size change data of the concrete test block from different heights; the displacement sensor transmits monitored data to the man-machine interaction system through a network cable, and the man-machine interaction system processes and displays the detected data, so that a tester can conveniently check the test data and observe the shrinkage and expansion of the concrete test block in real time, and the efficiency and accuracy of concrete size change measurement are further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of concrete measurement, and in particular relates to a testing system for measuring the shrinkage and expansion change rate of concrete. Background Art

[0002] Cement concrete is one of the most important materials in construction. During its hardening process, it undergoes deformations such as shrinkage and expansion, which significantly impact the concrete's performance and the durability of the structure. Traditional measurement methods, such as using a dial indicator or micrometer, measure deformation by directly contacting the concrete specimen surface. While simple to operate, this contact measurement method suffers from drawbacks such as low accuracy, the potential for human intervention to affect test results, and the potential for damage to the specimen surface, making it inadequate for high-precision measurements.

[0003] In recent years, laser ranging technology has been increasingly used in concrete deformation measurement. As a non-contact, high-precision measurement tool, laser displacement sensors can continuously monitor minute concrete deformations in real time without contacting the specimen. However, existing laser measurement systems are often complex, expensive, and inconvenient to operate. Their limited data processing capabilities make them difficult to adapt to diverse experimental needs. Therefore, there is an urgent need for a cement concrete shrinkage and expansion measurement system that is simple to operate, highly accurate, and versatile, to improve the efficiency and accuracy of concrete deformation measurement.

[0004] Patent application publication number CN 202974227 U discloses a multi-channel, fully automatic concrete shrinkage and expansion instrument. This instrument automatically measures concrete shrinkage and expansion through an integrated system consisting of a main unit, displacement sensor, temperature and humidity sensor, and measuring device. However, limitations in the system's shock absorption, multi-angle adjustment, and human-computer interaction limit measurement accuracy in complex environments. This can lead to sensitivity to external vibrations, limited adjustment flexibility, and unintuitive analysis of test results. Summary of the Invention

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to propose a test system for measuring the shrinkage and expansion change rate of concrete. By stably fixing the concrete test block on the shock-absorbing test bench and setting up a displacement sensor with adjustable height, accurate monitoring of the dimensional change of the concrete test block can be achieved. The displacement sensor transmits the monitored data to the human-computer interaction system via a network cable. The human-computer interaction system processes and displays the detected data, making it convenient for test personnel to view the test data and observe the shrinkage and expansion of the concrete test block in real time, further improving the efficiency and accuracy of measuring the dimensional change of concrete.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A test system for measuring the shrinkage and expansion change rate of concrete, comprising a shock-absorbing test bench 1, wherein pillars 1 2, 3, 4 and 5 are symmetrically arranged on both sides of the shock-absorbing test bench 1, a slide rail 1 6 is provided on the shock-absorbing test bench 1 between pillars 1 2 and 3, and a slide rail 2 7 is provided on the shock-absorbing test bench 1 between pillars 3 4 and 4 5. The slide rails 1 6 and 2 7 are respectively adapted to the sliders 12 configured at the bottoms of the rectangular baffle 8, the fixed block 1 9, the fixed block 2 10 and the convex baffle 11, and the rectangular baffle 8, the fixed block 1 9, the fixed block 2 10 and the convex baffle 11 are respectively fitted with the table top of the shock-absorbing test bench 1, and the pillars 1 2, one side of the rectangular baffle 8, the fixed block 1 9, the convex baffle One side of the plate 11 and the second pillar 3 are connected in sequence through a double-threaded adjusting bolt 13, and the third pillar 4, the other side of the rectangular baffle 8, the second fixed block 10, the other side of the convex baffle 11 and the fourth pillar 5 are connected in sequence through a double-threaded adjusting bolt 14; the tops of the first fixed block 9 and the second fixed block 10 are symmetrically provided with vertical poles 15, and a sleeve 16 is sleeved on the vertical pole 15. A displacement sensor 17 is provided on the side of the sleeve 16 facing the center of the shock absorption test bench 1, and an adjusting bolt 18 abutting against the vertical pole 15 is penetrated on the side of the sleeve 16 away from the displacement sensor 17; the signal output end of the displacement sensor 17 is connected to the signal input end of the human-computer interaction system 20 through a network cable 19.

[0008] Furthermore, the human-computer interaction system 20 is an industrial tablet computer installed with a QT environment.

[0009] Furthermore, the surface of the shock absorption test bench 1 is paved with rubber 21 .

[0010] Furthermore, the slide rail 1 6 and the slide rail 2 7 are connected to the slider 12 by a linear rolling guide pair.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The utility model adjusts the double-threaded adjusting bolt 13 and the double-threaded adjusting bolt 14, and then cooperates with the rectangular baffle 8, the fixing block 1 9, the fixing block 2 10 and the slider 12 configured at the bottom of the convex baffle 11 to slide synchronously with the slide rail 1 6 and the slide rail 2 7, thereby accurately adjusting the distance between the rectangular baffle 8 and the convex baffle 11 to fix the concrete test block, ensuring the stability of the concrete test block during the test process and further improving the accuracy and reliability of the test.

[0013] 2. The present invention adjusts the relative position of the sleeve 16 on the vertical rod 15 by adjusting the bolt 18, thereby adjusting the height of the displacement sensor 17, so as to more accurately monitor the size change of the concrete test block and realize the monitoring of concrete test blocks of different sizes.

[0014] In summary, the present invention stably fixes the concrete test block on the shock absorption test bench 1, and provides a displacement sensor 17 with adjustable height to achieve accurate monitoring of the dimensional changes of the concrete test block. The data monitored by the displacement sensor 17 is transmitted to the human-computer interaction system 20 through the network cable 19. The human-computer interaction system 20 processes and displays the detected data, making it convenient for test personnel to view the test data and observe the contraction and expansion of the concrete test block in real time, further improving the efficiency and accuracy of the measurement of concrete dimensional changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] Figure 2 It is a schematic diagram of the bottom structure of the utility model.

[0017] Figure 3 It is a schematic diagram of the top structure of the utility model.

[0018] Figure 4 It is a side structural schematic diagram of the present utility model.

[0019] Figure 5 This is a flowchart of the integrated module workflow of the human-computer interaction system 20 of the present invention.

[0020] In the figure: 1. Shock absorption test bench; 2. Pillar 1; 3. Pillar 2; 4. Pillar 3; 5. Pillar 4; 6. Slide rail 1; 7. Slide rail 2; 8. Rectangular baffle; 9. Fixed block 1; 10. Fixed block 2; 11. Convex baffle; 12. Slider; 13. Double-threaded adjustment bolt 1; 14. Double-threaded adjustment bolt 2; 15. Vertical pole; 16. Sleeve; 17. Displacement sensor; 18. Adjustment bolt; 19. Network cable; 20. Human-computer interaction system; 201. Network communication module; 202. Measurement module; 203. Algorithm module; 204. Data processing module; 21. Rubber. DETAILED DESCRIPTION

[0021] The present invention will be described in further detail below with reference to the accompanying drawings.

[0022] See also Figure 1-4A test system for measuring the shrinkage and expansion change rate of concrete includes a shock absorption test bench 1, and pillars 1 2, 3, 4 and 5 are symmetrically arranged on both sides of the shock absorption test bench 1. A slide rail 6 is provided on the shock absorption test bench 1 between pillars 1 2 and 3, and a slide rail 2 7 is provided on the shock absorption test bench 1 between pillars 3 4 and 4 5. The slide rail 1 6 and the slide rail 2 7 are respectively adapted to the slider 12 configured at the bottom of the rectangular baffle 8, the fixed block 1 9, the fixed block 2 10 and the convex baffle 11. The rectangular baffle 8, the fixed block 1 9, the fixed block 2 10 and the convex baffle 11 are respectively fitted with the table top of the shock absorption test bench 1, and the pillars 1 2, one side of the rectangular baffle 8, the fixed block 1 9, the convex baffle 11 are respectively fitted with the table top of the shock absorption test bench 1, and the pillars 1 2, one side of the rectangular baffle 8, the fixed block 1 9, the convex baffle One side of the rectangular baffle 11 and the second pillar 3 are connected in sequence through a double-threaded adjusting bolt 13, and the third pillar 4, the other side of the rectangular baffle 8, the second fixed block 10, the other side of the convex baffle 11 and the fourth pillar 5 are connected in sequence through a double-threaded adjusting bolt 2 14; by adjusting the double-threaded adjusting bolt 13 and the double-threaded adjusting bolt 2 14, and then coordinating the sliding block 12 configured at the bottom of the rectangular baffle 8, the first fixed block 9, the second fixed block 10 and the convex baffle 11 with the synchronous sliding of the slide rail 1 6 and the slide rail 2 7, the distance between the rectangular baffle 8 and the convex baffle 11 is accurately adjusted to fix the concrete test block, thereby ensuring the stability of the concrete test block during the test and further improving the accuracy and reliability of the test.

[0023] Vertical poles 15 are symmetrically arranged on the tops of the fixing blocks 1 9 and 2, 10, respectively. A sleeve 16 is sleeved on the vertical pole 15. A displacement sensor 17 is provided on the side of the sleeve 16 facing the center of the shock absorption test bench 1. An adjusting bolt 18 is provided through the side of the sleeve 16 facing away from the displacement sensor 17 and abuts against the vertical pole 15. The relative position of the sleeve 16 on the vertical pole 15 is adjusted by adjusting the bolt 18, and then the height of the displacement sensor 17 is adjusted, so that the size change of the concrete test block can be monitored more accurately, and the monitoring of concrete test blocks of different sizes can be realized.

[0024] The signal output terminals of the displacement sensor 17 are connected to the signal input terminals of the human-computer interaction system 20 via network cables 19. The displacement sensor 17 is implemented based on Miiris OptoNCDT1420.

[0025] This embodiment achieves accurate monitoring of the dimensional changes of the concrete test block by stably fixing the concrete test block on the shock absorption test bench 1 and providing a displacement sensor 17 with adjustable height. The displacement sensor 17 transmits the monitored data to the human-computer interaction system 20 via a network cable 19. The human-computer interaction system 20 processes and displays the detected data, making it convenient for test personnel to view the test data and observe the contraction and expansion of the concrete test block in real time, further improving the efficiency and accuracy of the measurement of concrete dimensional changes.

[0026] like Figure 1 and Figure 5 As shown, the human-computer interaction system 20 is an industrial tablet computer with a QT environment installed. This system is implemented based on the YW2161TX industrial tablet computer from Yanwei, which is also equipped with a QT environment. This industrial tablet computer includes executable files for an integrated network communication module 201, a measurement module 202, an algorithm module 203, and a data processing module 204.

[0027] like Figure 5 As shown, data transmission is established between the network communication module 201 and the displacement sensor 17. The communication method of the network communication module 201 uses a standard RJ45 interface to connect to the displacement sensor 17 through a network cable 19; the communication process is based on the network layer of the IPv4 protocol and the transport layer of the TCP / IP protocol, and the application layer is developed based on the RS422 communication standard.

[0028] The measurement module 202 implements an operating interface for user control commands and displays measurement results in real time in a graphical manner; the window interface used in the measurement module 202 is based on the QMainWindow in the QT environment to create objects, and the main window is divided into multiple sub-windows, and the sub-windows are composed of various control layouts; the controls are for user operation and generate corresponding operation signals, and each operation signal adds a corresponding slot function to respond to the operation signal.

[0029] The algorithm module 203 uses fast Fourier transform to perform real-time analysis on the data received and cached by the measurement module 202, and finally feeds back the processing results to the user.

[0030] The data processing module 204 is used to process the problem that the data transmission speed of the network communication module 201 is higher than the display speed of the final time domain waveform and frequency domain waveform, so that the refresh frequency of the time domain waveform and frequency domain waveform always remains an integer multiple of the frequency of data acquisition, ensuring that the time domain waveform and frequency domain waveform can be refreshed in real time according to the frequency of data acquisition.

[0031] like Figure 4 As shown, the table top of the shock absorption test bench 1 is paved with rubber 21. The laying of the rubber 21 can reduce the interference of external vibration on the test results and ensure the accuracy and reliability of the test data.

[0032] like Figure 2 As shown, the slide rail 1 6 and the slide rail 2 7 are connected to the slider 12 by a linear rolling guide pair, which facilitates adjusting the distance between the rectangular baffle 8 and the convex baffle 11 to fix concrete test blocks of different sizes, thereby ensuring the stability of the concrete test blocks during the test.

[0033] The working principle of this utility model is:

[0034] Step 1: Place the cast concrete test block in the middle of the shock absorption test bench 1. By adjusting the double-threaded adjusting bolt 13 and the double-threaded adjusting bolt 2 14, and coordinating the synchronous sliding of the slider 12 configured at the bottom of the rectangular baffle 8, the fixing block 1 9, the fixing block 2 10, and the convex baffle 11 with the slide rail 1 6 and the slide rail 2 7, the distance between the rectangular baffle 8 and the convex baffle 11 is precisely adjusted to fix the concrete test block, thereby ensuring the stability of the concrete test block.

[0035] Step 2: The relative position of the sleeve 16 on the vertical pole 15 is adjusted by adjusting the bolt 18, so that the displacement sensor 17 can monitor the dimensional change data of the concrete test block from different heights.

[0036] Step 3: The data monitored by the displacement sensor 17 is transmitted to the human-computer interaction system 20 via the network cable 19. The human-computer interaction system 20 is an industrial tablet computer installed with a QT environment. Based on the executable files of the network communication module 201, measurement module 202, algorithm module 203 and data processing module 204 integrated in the industrial tablet computer, the data monitored by the displacement sensor 17 is processed, which makes it convenient for test personnel to view the test data and observe the shrinkage and expansion of the concrete specimen in real time, further improving the efficiency and accuracy of the measurement of concrete dimensional changes.

[0037] The above embodiments are merely detailed descriptions of the present invention, but the present invention is not limited to the above embodiments. Any modifications, replacements and changes made to the present invention within the spirit and scope of protection of the claims of the present invention are within the scope of protection of the present invention.

Claims

1. A test system for measuring the shrinkage and expansion rate of concrete, characterized by: The invention comprises a shock-absorbing test bench (1), wherein pillars 1 (2), 2 (3), 3 (4) and 4 (5) are symmetrically arranged on both sides of the shock-absorbing test bench (1), a slide rail 1 (6) is provided on the shock-absorbing test bench (1) between pillars 1 (2) and 2 (3), and a slide rail 2 (7) is provided on the shock-absorbing test bench (1) between pillars 3 (4) and 4 (5), wherein the slide rail 1 (6) and the slide rail 2 (7) are respectively matched with a slide block (12) arranged at the bottom of a rectangular baffle (8), a fixed block 1 (9), a fixed block 2 (10) and a convex baffle (11), wherein the rectangular baffle (8), the fixed block 1 (9), the fixed block 2 (10) and the convex baffle (11) are respectively matched with the table surface of the shock-absorbing test bench (1), and pillars 1 (2), one side of the rectangular baffle (8), the fixed block 1 (9) and the convex baffle (11) are respectively matched with the table surface of the shock-absorbing test bench (1), and the ... sliding block (12) arranged at the bottom of the rectangular baffle (8), the fixed block 1 (9) and the convex baffle (11) are respectively matched with the sliding block (12) arranged at the bottom of the rectangular baffle (8), the fixed block 1 (9) and the convex baffle (11) One side and the second pillar (3) are connected in sequence through a double-threaded adjusting bolt (13); the third pillar (4), the other side of the rectangular baffle (8), the second fixed block (10), the other side of the convex baffle (11) and the fourth pillar (5) are connected in sequence through a double-threaded adjusting bolt (14); the tops of the first fixed block (9) and the second fixed block (10) are symmetrically provided with vertical poles (15), a sleeve (16) is sleeved on the vertical pole (15), a displacement sensor (17) is arranged on the side of the sleeve (16) facing the center of the shock absorption test bench (1), and an adjusting bolt (18) is provided on the side of the sleeve (16) away from the displacement sensor (17) and abutted against the vertical pole (15); the signal output end of the displacement sensor (17) is connected to the signal input end of the human-computer interaction system (20) through a network cable (19).

2. A testing system for measuring the shrinkage and expansion rate of concrete according to claim 1, characterized in that: The human-computer interaction system (20) is an industrial tablet computer installed with a QT environment.

3. A testing system for measuring the shrinkage and expansion rate of concrete according to claim 1, characterized in that: The table surface of the shock absorption test bench (1) is paved with rubber (21).

4. A testing system for measuring the shrinkage and expansion rate of concrete according to claim 1, characterized in that: The slide rail 1 (6) and the slide rail 2 (7) are connected to the slider (12) by a linear rolling guide pair.

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