Low-field nuclear magnetic resonance detection equipment for impervious performance of loaded concrete

Abstract

The utility model relates to low-field nuclear magnetic resonance detection equipment for impervious performance of loaded concrete, which belongs to the technical field of impervious testing of building material concrete and comprises a detection equipment body, an upper cover is arranged on the upper surface of the detection equipment body, and a coaxial cable connector is fixed at the center of the upper surface of the upper cover. An inner cavity of the coaxial cable connector is provided with a fixing mechanism used for fixing cables with different diameters. The fixing mechanism comprises an internal thread, a connecting sleeve and a stretching piece, the internal thread is arranged on the inner wall of the coaxial cable connector, and the connecting sleeve is in threaded connection with an inner cavity of the coaxial cable connector. According to the low-field nuclear magnetic resonance detection equipment for the impervious performance of the loaded concrete, the fixing mechanism is arranged on the upper surface of the coaxial cable connector on the upper side of the detection equipment body, and when a worker uses the coaxial cable connector to connect with external equipment, cables with different diameters can be limited and fixed through the arranged fixing mechanism, so that the detection efficiency is improved; and the practicability is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete impermeability testing of building materials, and particularly relates to a low-field nuclear magnetic resonance detection device for the impermeability performance of loaded concrete. Background Technique

[0002] During the use of concrete structures, they will be eroded by various external environments. One of the main factors is water seepage. If the impermeability performance of the concrete is not good, it will cause the water in the concrete to be unable to diffuse to the outside when the water evaporates, presenting the phenomenon of internal water seepage in the concrete. This phenomenon will lead to a decrease in the strength of the concrete, increased corrosion, extended service life, and endanger the safety of the building structure. Therefore, concrete impermeability detection is an important means to ensure the quality and safety of buildings.

[0003] For example, Chinese patent: CN205679551U discloses an embedded magnetic resonance sensor for detecting internal moisture of concrete materials, belonging to the technical field of sensors. The sensor includes a main magnet that generates a static magnetic field along the axial direction of the sensor in space, a radio frequency coil that generates a radio frequency magnetic field along the radial direction of the sensor, and a matching circuit. The static magnetic field generated by the main magnet is orthogonal to the radio frequency magnetic field generated by the radio frequency coil; the matching circuit is connected to the radio frequency coil. The embedded magnetic resonance sensor provided by this utility model has a small volume and is convenient to be embedded in the concrete structure during molding to realize the detection of internal moisture of concrete materials. However, when connecting with external equipment using a coaxial cable connector, due to the different diameters of the cables connected to the coaxial cable connector, the coaxial cable connector cannot adapt to the connection of cables with different sizes, and thus the limitation during connection is relatively high. Content of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a low-field nuclear magnetic resonance detection device for the impermeability performance of loaded concrete, which has the advantages of being able to connect coaxial cables with different diameters, etc., and solves the problem that when connecting with external equipment using a coaxial cable connector, due to the different diameters of the cables connected to the coaxial cable connector, the coaxial cable connector cannot adapt to the connection of cables with different sizes, and thus the limitation during connection is relatively high.

[0005] To achieve the above object, the utility model provides the following technical solution: A low-field nuclear magnetic resonance detection device for the impermeability performance of loaded concrete, including a detection device body, an upper cover is arranged on the upper surface of the detection device body, a coaxial cable connector is fixed at the center of the upper surface of the upper cover, and a fixing mechanism for fixing cables with different diameters is arranged in the inner cavity of the coaxial cable connector;

[0006] The fixing mechanism includes an internal thread, a connecting sleeve and a stretching member. The internal thread is provided on the inner wall of the coaxial cable connector. The connecting sleeve is threadedly connected to the inner cavity of the coaxial cable connector. The stretching member is arranged in the inner cavity of the connecting sleeve.

[0007] By adopting this technical solution, when the staff connects the coaxial cable connector to external equipment, the fixing mechanism can limit and fix cables with different diameters, thereby improving the practicability.

[0008] Furthermore, the stretching member includes four fixing blocks, four telescopic rods, four compression springs, four connecting blocks, two moving plates, two pressing plates and two pull rods. The four fixing blocks are respectively fixed at the top and bottom between the opposite sides of the left and right side walls of the inner cavity of the connecting sleeve. The inner walls of the opposite sides of the left and right ends of the fixing blocks are fixed to the telescopic rods. The compression springs are movably sleeved on the outer surfaces of the telescopic rods. The opposite sides of the left and right ends of the telescopic rods are fixed to the connecting blocks. The opposite sides of the two connecting blocks on the left end and the two connecting blocks on the right end are fixed to the moving plates. The two pressing plates are fixed to the opposite sides of the two moving plates.

[0009] By adopting this technical solution, the stretching member can limit and fix the cable entering the connecting sleeve.

[0010] Furthermore, one end of the pull rod is fixed to the moving plate, and the other end thereof penetrates through the connecting sleeve and extends to the side away from the connecting sleeve and is fixed with a handle.

[0011] By adopting this technical solution, the handle can facilitate the staff to drive the movement of the pull rod.

[0012] Furthermore, a sealing gasket is fixed to the lower surface of the upper cover, and the size of the sealing gasket is adapted to the size of the inner cavity of the detection device body.

[0013] By adopting this technical solution, the sealing gasket can seal the inner cavity of the detection device body.

[0014] Furthermore, a sliding groove is formed in both the inner top wall and the inner bottom wall of the fixing block. A sliding rod is slidably connected to the inner cavity of the sliding groove. One end of the sliding rod penetrates through the fixing block and extends to the outside of the fixing block and is fixed to the moving plate. The other end of the sliding rod is fixed with a limiting block.

[0015] By adopting this technical solution, the arranged sliding groove, sliding rod and limiting block can limit the movement of the moving plate.

[0016] Furthermore, both ends of the compression spring are fixedly connected between the opposite sides of the fixing block and the connecting block.

[0017] Further, the pressing plate is a rubber plate, and the cross-sectional shape of the pressing plate is semi-circular.

[0018] By adopting this technical solution, setting the pressing plate as a rubber plate can increase the friction between the pressing plate and the cable.

[0019] Further, the telescopic rod includes a fixed rod and an inner rod nested with each other, and the size of the connecting block is smaller than the size of the inner cavity of the fixed block.

[0020] By adopting this technical solution, setting the size of the connecting block to be smaller than the size of the inner cavity of the fixed block allows the connecting block to enter the inner cavity of the fixed block when the cable diameter is large, increasing the gap between the two pressing plates.

[0021] Compared with the prior art, the technical solution of the present application has the following beneficial effects:

[0022] For this low-field nuclear magnetic resonance detection device for the anti-seepage performance of loaded concrete, a fixing mechanism is provided on the upper surface of the coaxial cable joint on the upper side of the detection device body. When the staff connects the coaxial cable joint with an external device, the fixing mechanism can limit and fix cables with different diameters, thereby improving the practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the present utility model;

[0024] Figure 2 is a schematic structural diagram of the upper cover of the present utility model;

[0025] Figure 3 is a schematic structural diagram of the fixing mechanism of the present utility model;

[0026] Figure 4 is a schematic structural diagram of a part of the fixing mechanism of the present utility model.

[0027] In the figure: 1, detection device body; 2, upper cover; 3, coaxial cable joint; 4, fixing mechanism; 41, internal thread; 42, connecting sleeve; 43, stretching member; 431, fixed block; 432, telescopic rod; 433, compression spring; 434, connecting block; 435, moving plate; 436, pressing plate; 437, pull rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0029] Please refer to Figure 1-2 , in this embodiment, a low-field nuclear magnetic resonance detection device for the anti-seepage performance of loaded concrete includes a detection device body 1. An upper cover 2 is provided on the upper surface of the detection device body 1. A coaxial cable connector 3 is fixed at the center of the upper surface of the upper cover 2. A fixing mechanism 4 for fixing cables with different diameters is provided in the inner cavity of the coaxial cable connector 3.

[0030] In this embodiment, a sealing gasket is fixed on the lower surface of the upper cover 2, and the size of the sealing gasket is adapted to the size of the inner cavity of the detection device body 1.

[0031] It should be noted that the fixing mechanism 4 can limit and fix cables with different diameters, thereby improving the practicability.

[0032] Please refer to Figure 3-4 , in order to fix cables with different diameters, the fixing mechanism 4 in this embodiment includes an internal thread 41, a connecting sleeve 42, and a stretching member 43. The internal thread 41 is provided on the inner wall of the coaxial cable connector 3. The connecting sleeve 42 is threadedly connected in the inner cavity of the coaxial cable connector 3. The stretching member 43 is arranged in the inner cavity of the connecting sleeve 42. The connecting sleeve 42 is sleeved on the outer surface of the cable, and the inner conductor of the cable is fixed to the inner conductor in the coaxial cable connector 3.

[0033] In this embodiment, the stretching member 43 includes four fixing blocks 431, four telescopic rods 432, four compression springs 433, four connecting blocks 434, two moving plates 435, two pressing plates 436, and two pull rods 437. The four fixing blocks 431 are respectively fixed between the top and bottom of the opposite sides of the left and right side walls of the inner cavity of the connecting sleeve 42. The inner walls of the opposite sides of the left and right end fixing blocks 431 are both fixed to the telescopic rods 432. The compression springs 433 are movably sleeved on the outer surfaces of the telescopic rods 432. The opposite sides of the left and right end telescopic rods 432 are both fixed to the connecting blocks 434. The opposite sides of the two connecting blocks 434 on the left end and the two connecting blocks 434 on the right end are both fixed to the moving plates 435. The two pressing plates 436 are fixed on the opposite sides of the two moving plates 435.

[0034] Among them, one end of the pull rod 437 is fixed to the moving plate 435, and the other end thereof penetrates through the connecting sleeve 42 and extends to the side away from the connecting sleeve 42 and is fixed with a handle. By pulling the two pull rods 437, the movement of the pull rods 437 drives the movement of the moving plates 435 and the pressing plates 436. At this time, the movement of the moving plates 435 can make the connecting blocks 434 move, thereby squeezing the telescopic rods 432 and the compression springs 433, so that the telescopic rods 432 and the compression springs 433 are shortened. At this time, a larger gap is separated between the two pressing plates 436 until the separated gap can adjust the length of the cable extending into the connecting sleeve 42.

[0035] A gasket is fixed to the lower surface of the upper cover 2. The size of the gasket is adapted to the size of the inner cavity of the detection device body 1. The inner top wall and inner bottom wall of the fixing block 431 are both provided with sliding grooves. A sliding rod is slidably connected to the inner cavity of the sliding groove. One end of the sliding rod penetrates through the fixing block 431 and extends to the outside of the fixing block 431 and is fixed to the moving plate 435. The other end of the sliding rod is fixed with a limiting block.

[0036] In this embodiment, the two ends of the compression spring 433 are respectively fixedly connected between the opposite sides of the fixing block 431 and the connecting block 434. The pressing plate 436 is a rubber plate. The cross-sectional shape of the pressing plate 436 is semi-circular. The telescopic rod 432 includes a fixed rod and an inner rod that are nested with each other. The size of the connecting block 434 is smaller than the size of the inner cavity of the fixing block 431.

[0037] It can be understood that the connecting sleeve 42 is screwed into the inner cavity of the coaxial cable connector 3 through the internal thread 41, and then the two pull rods 437 are loosened. At this time, the compression spring 433 rebounds and drives the telescopic rod 432 to extend, so that the moving plates 435 and the pressing plates 436 at the left and right ends move relatively, and the surface of the cable can be fixed.

[0038] The working principle of the above embodiment is as follows:

[0039] In order to connect cables with different diameters to the coaxial cable connector 3, first, the connecting sleeve 42 needs to be sleeved on the outer surface of the cable, and the inner conductor of the cable is fixed to the inner conductor in the coaxial cable connector 3. Then, the two pull rods 437 are pulled. The movement of the pull rods 437 drives the movement of the moving plates 435 and the pressing plates 436. At this time, the movement of the moving plates 435 can make the connecting block 434 move, thereby squeezing the telescopic rod 432 and the compression spring 433, so that the telescopic rod 432 and the compression spring 433 are shortened. At this time, a larger gap is separated between the two pressing plates 436 until the separated gap can adjust the length of the cable extending into the connecting sleeve 42. Then, the connecting sleeve 42 is screwed into the inner cavity of the coaxial cable connector 3 through the internal thread 41, and then the two pull rods 437 are loosened. At this time, the compression spring 433 rebounds and drives the telescopic rod 432 to extend, so that the moving plates 435 and the pressing plates 436 at the left and right ends move relatively, and the surface of the cable can be fixed.

Claims

1. A low-field nuclear magnetic resonance detection device for the anti-seepage performance of loaded concrete, comprising a detection device body (1), characterized in that: The upper surface of the detection device body (1) is provided with an upper cover (2). At the center of the upper surface of the upper cover (2), a coaxial cable connector (3) is fixed. The inner cavity of the coaxial cable connector (3) is provided with a fixing mechanism (4) for fixing cables of different diameters; The fixing mechanism (4) includes an internal thread (41), a connecting sleeve (42) and a stretching member (43). The internal thread (41) is provided on the inner wall of the coaxial cable connector (3). The connecting sleeve (42) is threadedly connected to the inner cavity of the coaxial cable connector (3). The stretching member (43) is arranged in the inner cavity of the connecting sleeve (42).

2. The low-field nuclear magnetic resonance detection device for the anti-seepage performance of loaded concrete according to claim 1, wherein: The stretching member (43) includes four fixing blocks (431), four telescopic rods (432), four compression springs (433), four connecting blocks (434), two moving plates (435), two pressing plates (436) and two pull rods (437). The four fixing blocks (431) are respectively fixed between the top and bottom of the opposite sides of the left and right side walls of the inner cavity of the connecting sleeve (42). The inner walls of the opposite sides of the left and right ends of the fixing blocks (431) are both fixed to the telescopic rods (432). The compression springs (433) are movably sleeved on the outer surfaces of the telescopic rods (432). The opposite sides of the left and right ends of the telescopic rods (432) are both fixed to the connecting blocks (434). The opposite sides of the two connecting blocks (434) at the left end and the two connecting blocks (434) at the right end are both fixed to the moving plates (435). The two pressing plates (436) are fixed to the opposite sides of the two moving plates (435).

3. The low-field nuclear magnetic resonance detection device for the impermeability performance of loaded concrete according to claim 2, characterized in that: One end of the pull rod (437) is fixed to the moving plate (435), and the other end thereof penetrates through the connecting sleeve (42) and extends to the side far from the connecting sleeve (42) and is fixed with a handle.

4. The low-field nuclear magnetic resonance detection device for the anti-seepage performance of loaded concrete according to claim 2, characterized in that: A sealing gasket is fixed to the lower surface of the upper cover (2). The size of the sealing gasket is adapted to the size of the inner cavity of the detection device body (1).

5. The low-field nuclear magnetic resonance detection device for the anti-seepage performance of loaded concrete according to claim 2, characterized in that: Chute grooves are opened on both the inner top wall and the inner bottom wall of the fixing block (431). A sliding rod is slidably connected to the inner cavity of the chute groove. One end of the sliding rod penetrates through the fixing block (431) and extends to the outside of the fixing block (431) and is fixed to the moving plate (435). The other end of the sliding rod is fixed with a limiting block.

6. The low-field nuclear magnetic resonance detection device for the impermeability performance of loaded concrete according to claim 2, wherein: Both ends of the compression spring (433) are fixedly connected between the opposite sides of the fixing block (431) and the connecting block (434).

7. The low-field nuclear magnetic resonance detection device for the anti-permeability performance of loaded concrete according to claim 2, characterized in that: The pressing plate (436) is a rubber plate, and the cross-sectional shape of the pressing plate (436) is semicircular.

8. The low-field nuclear magnetic resonance detection device for the anti-seepage performance of loaded concrete according to claim 2, characterized in that: The telescopic rod (432) includes a fixed rod and an inner rod which are nested with each other. The size of the connecting block (434) is smaller than the size of the inner cavity of the fixing block (431).

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