Positioning device for detecting anti-cracking concrete

Abstract

The utility model relates to a kind of positioning device for anti-crack concrete detection, it includes rack, at least two groups and parallelly arranged linear drive member on the rack and at least two screw pairs, multiple positioning plates respectively through intermediate connecting piece setting in the moving end of the linear drive member and at least two screw pairs, and pressure sensor setting in one of positioning plates, the multiple positioning plates are respectively relative to the circumferential arrangement of concrete test piece, the detection end of the pressure sensor is relative to the outside surface of concrete test piece arrangement, and signal output end is electrically connected in the signal input end of the linear drive member. The utility model is centered to the concrete test piece on pressure testing machine, to avoid concrete test piece displacement when detecting, ensure the purpose of the detection quality of concrete test piece.

Description

Technical Field

[0001] This utility model relates to the technical field of concrete testing, and in particular to a positioning device for testing crack-resistant concrete. Background Technology

[0002] Concrete quality directly affects the lifespan of reinforced concrete structures, and concrete crack resistance is one of the main indicators directly reflecting the degree of concrete quality. Therefore, concrete testing is necessary. Concrete crack resistance refers to concrete's ability to resist cracking, especially its ability to resist the formation of macroscopic cracks. Its performance is related to indicators such as tensile strength, ultimate tensile value, and modulus of elasticity. Concrete cracks can be divided into three categories: stress cracks, drying shrinkage cracks, and temperature cracks, which are caused by external forces, humidity changes, and thermal expansion and contraction, respectively. Microcracks are mainly distributed at the aggregate-cement paste interface, and crack propagation is closely related to the homogeneity of the material. In current concrete testing, concrete specimens are often placed directly on the worktable of a concrete compression testing machine. Because there is no structure for individually positioning the concrete specimens, it is easy to place the specimens off-center, resulting in uneven stress on the tested concrete specimens and thus inaccurate test data. Utility Model Content

[0003] The present invention addresses the aforementioned shortcomings in the prior art by providing a positioning device for testing crack-resistant concrete. By centering the concrete specimen on the pressure testing machine, it aims to prevent the concrete specimen from shifting during testing and ensure the testing quality of the concrete specimen.

[0004] The above-mentioned objective of this utility model is achieved through the following technical solution: A positioning device for testing crack-resistant concrete includes a frame, at least two sets of linear drive components and at least two lead screw pairs arranged in parallel on the frame, multiple positioning plates respectively connected to the moving ends of the linear drive components and the at least two lead screw pairs via intermediate connecting members, and a pressure sensor disposed on one of the positioning plates. The multiple positioning plates are arranged circumferentially relative to the concrete specimen, the detection end of the pressure sensor is arranged relative to the outer surface of the concrete specimen, and the signal output end is electrically connected to the signal input end of the linear drive component.

[0005] By adopting the above technical solution, during the seepage prevention and crack resistance testing of concrete specimens, these adjustable positioning plates support and limit the concrete specimens in the circumference, thereby achieving centering of the concrete specimens on the pressure testing machine and ensuring the stability and consistency of the concrete specimens during the testing process. Among them, the lead screw pair adjusts the position of the positioning plates according to the known diameter of the concrete specimen, while the linear drive component monitors the contact pressure between the concrete specimen and the positioning plate in real time through pressure sensors and dynamically adjusts the position of the corresponding positioning plate. This ensures that each positioning plate maintains a suitable pre-pressure with the concrete specimen, avoiding displacement caused by uneven pressure on the concrete specimen, and further ensuring the testing quality of the concrete specimens.

[0006] The present invention is further configured such that: the linear drive includes a first mounting base disposed on the frame, a linear motor and at least two grating ruler displacement sensors disposed on the first mounting base, a first support plate disposed on the moving end of the linear motor and at least two grating ruler displacement sensors, a driver, and a controller; the intermediate connecting member is disposed on the first support plate; the signal output terminals of the pressure sensor and the grating ruler displacement sensor are electrically connected to the signal input terminal of the controller; the signal input terminal of the driver is electrically connected to the signal output terminal of the controller; and the signal output terminal is electrically connected to the signal input terminal of the linear motor.

[0007] By adopting the above technical solution, the pressure sensor is used to monitor the contact pressure between the concrete specimen and the positioning plate in real time, the grating ruler displacement sensor is used to read the current feed distance of the linear motor, and after receiving the contact pressure signal, the controller compares it with the pressure threshold and selectively controls the driver to start according to the transmission signal of the grating ruler displacement sensor, thereby controlling the linear motor to extend and retract according to the predetermined feed distance, so as to maintain a suitable pre-pressure between the positioning plate and the concrete specimen.

[0008] The present invention is further configured such that: the scale grating of the grating displacement sensor is disposed on the first support plate and slidably connected to the first mounting base, and the grating reading head is disposed on the first mounting base and arranged relative to the scale grating.

[0009] By adopting the above technical solution, it is beneficial to improve the feedback accuracy.

[0010] The present invention is further configured such that: the lead screw pair includes a second mounting base disposed on the frame, a transmission nut disposed on the second mounting base, a second support plate slidably connected to the second mounting base, and a lead screw shaft threadedly connected to the transmission nut and rotatably connected to the second support plate, and the intermediate connecting member is disposed on the second support plate.

[0011] By adopting the above technical solution, the lead screw pair has the advantages of good self-locking and small starting torque. It can drive the second support plate to move at a fixed point by rotating the lead screw shaft, thereby realizing the fine adjustment of the position of the positioning plate.

[0012] The present invention is further configured such that the lead screw pair also includes a gripping part disposed on the lead screw shaft.

[0013] By adopting the above technical solution, it is easier for users to grasp and apply force.

[0014] The present invention is further configured such that: the intermediate connecting member includes a positioning block disposed on the moving end of the linear drive member or lead screw pair, an adjusting strip disposed on the positioning plate, a slot opened on the adjusting strip, and at least two fasteners disposed on the positioning block and slidably locked on the slot.

[0015] By adopting the above technical solution, both the lead screw pair and the linear drive are used to complete the fine adjustment of the positioning plate. Therefore, the intermediate connector is used to disassemble and assemble the positioning plate and make coarse adjustments to its position through fasteners, making the entire device more flexible and convenient to operate. In addition, the structural design of the intermediate connector allows users to adjust the size of the positioning plate according to actual needs to adapt to the positioning requirements of concrete specimens of different specifications. In this way, the applicability and working efficiency of the positioning device can be effectively improved.

[0016] The present invention is further configured such that: the fastener includes a fastening bolt slidably connected to the strip opening and passing through the positioning block, and a fastening nut threadedly connected to the fastening bolt, the end face of the fastening bolt closely abutting the surface of the adjusting strip, and the end face of the fastening nut closely abutting the surface of the positioning block.

[0017] By adopting the above technical solution, precise position adjustment and rapid assembly / disassembly of the positioning device are achieved, thereby improving testing efficiency and product quality.

[0018] The present invention is further configured such that the positioning plate is made of a flexible material.

[0019] By adopting the above technical solution, the flexible material positioning plate can better fit the shape of the concrete specimen.

[0020] In summary, the beneficial technical effects of this utility model are as follows: by adjusting the position of the positioning plate in the circumferential direction of the concrete specimen through the lead screw pair and linear drive component, the concrete specimen on the pressure testing machine is centered, thereby avoiding displacement caused by uneven pressure on the concrete specimen and improving the testing quality of the concrete specimen.

[0021] In summary, the beneficial technical effects of this utility model are as follows: by adjusting the position of the positioning plate in the circumferential direction of the concrete specimen through the lead screw pair and linear drive component, the concrete specimen on the pressure testing machine is centered, which can ensure that each positioning plate maintains a suitable pre-pressure between the concrete specimen and the concrete specimen, avoid uneven pressure on the concrete specimen and displacement, and thus ensure the testing quality of the concrete specimen. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the positioning device for detecting crack-resistant concrete according to this utility model.

[0023] Figure 2 This is a schematic diagram showing the connection relationship between the linear drive component, positioning plate, intermediate connector and pressure sensor of this utility model.

[0024] Figure 3 This is a schematic diagram showing the connection relationship between the lead screw pair, the positioning plate, and the intermediate connecting parts of this utility model.

[0025] In the diagram, 1. Frame; 2. Linear drive unit; 21. First mounting base; 22. Linear motor; 23. Grating ruler displacement sensor; 24. First support plate; 25. Driver; 26. Controller; 3. Lead screw pair; 31. Second mounting base; 32. Transmission nut; 33. Second support plate; 34. Lead screw shaft; 35. Grip part; 4. Positioning plate; 5. Intermediate connecting part; 51. Positioning block; 52. Adjusting bar; 53. Strip opening; 54. Fastener; 541. Fastening bolt; 542. Fastening nut; 6. Pressure sensor. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this utility model clearer and easier to understand, the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] Reference Figure 1 This utility model discloses a positioning device for testing crack-resistant concrete, used to coordinate the arrangement of concrete specimens on a pressure testing machine. It includes a frame 1, two sets of linear drive components 2 and two lead screw pairs 3 arranged side-by-side on the frame 1, multiple positioning plates 4 respectively connected to the moving ends of the linear drive components 2 and the two lead screw pairs 3 via intermediate connecting parts 5, and a pressure sensor 6 mounted on one of the positioning plates 4. The two sets of linear drive components 2 and the two lead screw pairs 3 are arranged along the length of the concrete specimen for centering. The three positioning plates 4 are made of flexible material and are arranged circumferentially relative to the concrete specimen. The detection end of the pressure sensor 6 is arranged relative to the outer surface of the concrete specimen, and its signal output end is electrically connected to the signal input end of the linear drive component 2.

[0028] During the seepage prevention and crack resistance testing of concrete specimens, these adjustable positioning plates 4 support and limit the concrete specimens in the circumference, respectively, to achieve centering of the concrete specimens on the pressure testing machine, ensuring the stability and consistency of the concrete specimens during the testing process. Among them, the lead screw pair 3 adjusts the position of the positioning plates 4 according to the known diameter of the concrete specimen, while the linear drive component 2 monitors the contact pressure between the concrete specimen and the positioning plates 4 in real time through the pressure sensor 6, and dynamically adjusts the position of the corresponding positioning plates 4. This ensures that each positioning plate 4 maintains a suitable pre-pressure with the concrete specimen, avoids uneven pressure on the concrete specimen leading to displacement, and further ensures the testing quality of the concrete specimens.

[0029] Reference Figure 2 The linear drive unit 2 includes a first mounting base 21 mounted on the frame 1, a linear motor 22 and two grating ruler displacement sensors 23 mounted on the first mounting base 21, a first support plate 24 mounted on the moving ends of the linear motor 22 and the two grating ruler displacement sensors 23, a driver 25, and a controller 26. An intermediate connector 5 is mounted on the first support plate 24. The signal output terminals of the pressure sensor 6 and the grating ruler displacement sensors 23 are electrically connected to the signal input terminal of the controller 26. The signal input terminal of the driver 25 is electrically connected to the signal output terminal of the controller 26, and its signal output terminal is electrically connected to the signal input terminal of the linear motor 22. The scale grating of the grating ruler displacement sensor 23 is mounted on the first support plate 24 and slidably connected to the first mounting base 21. The grating reading head is mounted on the first mounting base 21 and arranged relative to the scale grating. Pressure sensor 6 is used to monitor the contact pressure between the concrete specimen and the positioning plate 4 in real time. Grating ruler displacement sensor 23 is used to read the current feed distance of linear motor 22. After receiving the contact pressure signal, controller 26 compares it with the pressure threshold and selectively controls the start of driver 25 according to the transmission signal of grating ruler displacement sensor 23, thereby controlling linear motor 22 to extend and retract according to a predetermined feed distance, so as to maintain a suitable pre-pressure between positioning plate 4 and concrete specimen.

[0030] Reference Figure 3 The lead screw assembly 3 includes a second mounting base 31 mounted on the frame 1, a transmission nut 32 mounted on the second mounting base 31, a second support plate 33 slidably connected to the second mounting base 31, a lead screw shaft 34 threadedly connected to the transmission nut 32 and rotatably connected to the second support plate 33, and a gripping part 35 mounted on the lead screw shaft 34. An intermediate connecting member 5 is mounted on the second support plate 33. The lead screw assembly has the advantages of good self-locking and low starting torque, and can drive the second support plate 33 to move at a fixed point by rotating the lead screw shaft 34, thereby achieving fine-tuning of the position of the positioning plate 4.

[0031] The intermediate connecting member 5 includes a positioning block 51 disposed on the moving end of the linear drive member 2 or the lead screw pair 3, an adjusting strip 52 disposed on the positioning plate 4, a slot 53 opened on the adjusting strip 52, and two fasteners 54 disposed on the positioning block 51 and slidably locked on the slot 53. The fasteners 54 include a fastening bolt 541 slidably connected to the slot 53 and passing through the positioning block 51, and a fastening nut 542 threadedly connected to the fastening bolt 541. The end face of the fastening bolt 541 tightly abuts against the surface of the adjusting strip 52, and the end face of the fastening nut 542 tightly abuts against the surface of the positioning block 51. Both the lead screw pair 3 and the linear drive component 2 are used to complete the fine adjustment of the position of the positioning plate 4. Therefore, the intermediate connecting component 5 is used to disassemble and assemble the positioning plate 4 and make coarse adjustments to its position through the fastener 54, making the entire device more flexible and convenient during operation. In addition, the structural design of the intermediate connecting component 5 also allows users to adjust the size of the positioning plate 4 according to actual needs to adapt to the positioning requirements of concrete specimens of different specifications. In this way, the applicability and working efficiency of the positioning device can be effectively improved.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A positioning device for use in the detection of anti-crack concrete, characterized in that: The device includes a frame (1), at least two sets of linear drive units (2) and at least two lead screw pairs (3) arranged in parallel on the frame (1), multiple positioning plates (4) respectively arranged at the moving ends of the linear drive units (2) and the at least two lead screw pairs (3) via intermediate connecting parts (5), and a pressure sensor (6) arranged on one of the positioning plates (4). The multiple positioning plates (4) are arranged circumferentially relative to the concrete specimen. The detection end of the pressure sensor (6) is arranged relative to the outer surface of the concrete specimen, and the signal output end is electrically connected to the signal input end of the linear drive unit (2).

2. The positioning device for detecting anti-cracking concrete according to claim 1, wherein: The linear drive unit (2) includes a first mounting base (21) disposed on the frame (1), a linear motor (22) and at least two grating ruler displacement sensors (23) disposed on the first mounting base (21), a first support plate (24) disposed on the moving end of the linear motor (22) and at least two grating ruler displacement sensors (23), a driver (25), and a controller (26). The intermediate connector (5) is disposed on the first support plate (24). The signal output terminals of the pressure sensor (6) and the grating ruler displacement sensors (23) are electrically connected to the signal input terminal of the controller (26). The signal input terminal of the driver (25) is electrically connected to the signal output terminal of the controller (26), and the signal output terminal is electrically connected to the signal input terminal of the linear motor (22).

3. The positioning device for detecting anti-cracking concrete according to claim 2, characterized in that: The scale grating of the grating displacement sensor (23) is set on the first support plate (24) and slidably connected to the first mounting base (21), and the grating reading head is set on the first mounting base (21) and arranged relative to the scale grating.

4. The positioning device for detecting cracks in concrete according to claim 1, wherein: The lead screw assembly (3) includes a second mounting base (31) disposed on the frame (1), a transmission nut (32) disposed on the second mounting base (31), a second support plate (33) slidably connected to the second mounting base (31), and a lead screw shaft (34) threadedly connected to the transmission nut (32) and rotatably connected to the second support plate (33). The intermediate connecting member (5) is disposed on the second support plate (33).

5. The positioning device for detecting cracks in concrete according to claim 4, wherein: The lead screw pair (3) also includes a gripping part (35) disposed on the lead screw shaft (34).

6. The positioning device for detecting cracks in concrete according to claim 1, wherein: The intermediate connector (5) includes a positioning block (51) disposed on the moving end of the linear drive (2) or the lead screw pair (3), an adjusting strip (52) disposed on the positioning plate (4), a slot (53) opened on the adjusting strip (52), and at least two fasteners (54) disposed on the positioning block (51) and slidably locked on the slot (53).

7. The positioning device for detecting cracks in concrete according to claim 6, wherein: The fastener (54) includes a fastening bolt (541) slidably connected to the strip opening (53) and passing through the positioning block (51), and a fastening nut (542) threadedly connected to the fastening bolt (541). The end face of the fastening bolt (541) closely abuts against the surface of the adjusting strip (52), and the end face of the fastening nut (542) closely abuts against the surface of the positioning block (51).

8. The positioning device for detecting cracks in concrete according to claim 1, wherein: The positioning plate (4) is made of flexible material.

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