A concrete crack width detection device

Abstract

A concrete crack width detection device, relating to the field of crack detection technology, includes a concrete crack width measuring instrument and a probe. A connecting line and an extension line are provided between the concrete crack width measuring instrument and the probe. The device is characterized by a rear connecting plate on the rear side of the concrete crack width measuring instrument, on which a storage box is installed. A lifting assembly is slidably fitted inside the storage box. The probe is rotatably connected to the top of the lifting assembly and locked in place by adjusting bolts. The storage assembly is located on the rear connecting plate, and the extension line is wound around it. This invention allows for stepless adjustment, and with the hinged seat angle adjustment, ensures precise probe alignment with the crack. The automatic wire retraction function shortens equipment preparation time, and the integrated design facilitates portability and deployment, reducing equipment preparation time to less than 5 minutes. A single set of equipment covers multiple specification detection needs, reducing mold and equipment inventory costs and significantly improving equipment utilization.

Description

Technical Field

[0001] This utility model relates to the field of crack detection technology, and more specifically, to a device for detecting the width of concrete cracks. Background Technology

[0002] Concrete crack width detection is a crucial step in building engineering quality inspection and structural health monitoring, directly impacting the safety and durability of buildings.

[0003] Currently, there are various concrete crack width measuring instruments on the market. These instruments typically consist of a concrete crack width gauge, a probe, and a connecting cable. During testing, the probe is aimed at the crack to capture an image of it, and the image data is transmitted to the width gauge for processing and display via the connecting cable.

[0004] However, existing concrete crack width detectors still have some technical shortcomings in practical applications, limiting their accuracy and efficiency. For example, Chinese patent CN221945171U discloses a concrete crack width detector. In this design, the adjustment plate is difficult to store, and the adjustment holes are arranged in a vertical array, limiting the adjustment accuracy to the spacing between the holes and making fine adjustments impossible. Furthermore, the connecting wire is not designed with a dedicated storage device, which may cause the connecting wire to become tangled or damaged during the detection process. Utility Model Content

[0005] This invention provides a concrete crack width detection device to solve at least one of the above-mentioned technical problems.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A concrete crack width detection device includes a concrete crack width measuring instrument and a probe. A connecting line and an extension line are provided between the concrete crack width measuring instrument and the probe. The device is characterized in that a rear connecting plate is provided on the rear side of the concrete crack width measuring instrument, a storage box is installed on the rear connecting plate, a lifting component is slidably fitted inside the storage box, the probe is rotatably connected to the top of the lifting component and locked and fixed by adjusting bolts, and the storage component is provided on the rear connecting plate, with an extension line wound on the storage component.

[0008] Furthermore, the storage box has an anti-slip rubber layer on the side away from the concrete crack width measuring instrument.

[0009] Furthermore, the lifting assembly includes an outer tube, a middle tube that slides inside the outer tube, an inner rod that slides inside the middle tube, a lower flange at the top of the inner rod, the lower flange being fixedly connected to an upper flange by bolts, a hinge seat at the top of the upper flange, a rotating rod rotatably connected to the hinge seat and locked in place by adjusting bolts, and a probe fixedly connected to the top of the rotating rod.

[0010] Furthermore, the inner wall of the top of the outer tube has an internal thread, and the outer wall of the bottom of the middle tube has an external thread that mates with the internal thread.

[0011] Furthermore, a sliding cavity is formed in the middle of the storage box, and an outer tube is slidably fitted inside the sliding cavity. The storage box is provided with several threaded holes, and a fastening knob is threadedly connected inside the threaded holes. The fastening knob can be threadedly connected in the threaded holes and restrict the relative movement between the outer tube and the storage box.

[0012] Furthermore, a first rubber layer is formed on the inner wall of the sliding cavity, and a second rubber layer is formed on the outer wall of the outer tube. When the outer tube is inserted into the sliding cavity, the first rubber layer and / or the second rubber layer undergo elastic deformation.

[0013] Furthermore, the storage assembly includes two parallel support plates, which are fixedly connected to the top of the rear connecting plate. A rotating shaft is rotatably connected between the two support plates. A winding wheel is mounted on the rotating shaft, and a torsion spring is sleeved on the rotating shaft. One end of the torsion spring is fixedly connected to the support plate, and the other end is fixedly connected to the winding wheel. An extended wire is wound on the winding wheel. The rotating shaft is a hollow tube, and a mounting hole is formed on the winding wheel. One end of the extended wire passes through the mounting hole and the rotating shaft in sequence, extending to the outside.

[0014] Compared with the prior art, the advantages of this utility model are: this utility model can achieve stepless adjustment, and with the hinge seat angle adjustment, it can ensure that the probe is accurately aligned with the crack; the automatic wire retraction function shortens the equipment preparation time, the integrated design is easy to carry and deploy, and the equipment preparation time is shortened to less than 5 minutes; a single set of equipment covers multiple specifications of testing needs, reduces mold and equipment inventory costs, and greatly improves equipment utilization. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a top view of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure at the junction of the outer tube and the middle tube;

[0018] Figure 4 for Figure 1A magnified view of a section at point A in the middle;

[0019] Figure 5 This is a schematic diagram of the winding reel;

[0020] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention. Detailed Implementation

[0021] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0023] Furthermore, in the description of this utility model, it should be understood that the terms "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the accompanying drawings.

[0024] The orientations or positional relationships shown are for the convenience of describing this utility model and simplifying the description, and are not intended to indicate any specific location, orientation, or position.

[0025] The device or component referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0026] Therefore, this should not be construed as a limitation on this utility model.

[0027] In this utility model, unless otherwise expressly specified and limited, the terms "installation", "connection", and "connection" are used interchangeably.

[0028] Terms such as "connection" and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a fixed connection.

[0029] It can be detachable or integrated; it can be a mechanical connection, an electrical connection, or a communication connection.

[0030] It can be a direct connection, or an indirect connection through an intermediate medium; it can be a connection within the two components.

[0031] Or the interaction relationship between two components. For those skilled in the art, this can be determined based on specific...

[0032] The specific meanings of the above terms in this utility model are understood.

[0033] In this utility model, unless otherwise expressly specified and limited, the first feature is "on" the second feature.

[0034] "Down" can mean that the first and second features are in direct contact, or that the first and second features are in contact through an intermediate medium.

[0035] Contact. In the description of this specification, references are made to the terms "implementation method," "example," and "a method."

[0036] The descriptions of "exemplary embodiments," "examples," or "specific examples," etc., refer to those described in connection with the embodiment or example.

[0037] Specific features, structures, materials, or characteristics are included in at least one embodiment or example of this utility model.

[0038] In this specification, the illustrative expressions of the terms used do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may appear in any one or more embodiments or examples.

[0039] The example combines them in an appropriate way.

[0040] Those skilled in the art will understand that while existing concrete crack width detectors can measure cracks at different heights using auxiliary mechanisms, they suffer from problems such as inconvenient operation, inconvenient storage, and inconsistent adjustment ranges. Furthermore, existing connecting wires are prone to tangling, knotting, or damage.

[0041] To solve the above problems, it is necessary to design a lifting structure that is easier to adjust and has better storage capacity, as well as an automatic cable reel or a retractable connecting cable mechanism to facilitate the storage and unfolding of the connecting cable.

[0042] like Figures 1-5 As shown, a concrete crack width detection device includes a concrete crack width measuring instrument 1 and a probe 3. A connecting line 22 and an extension line 21 are provided between the concrete crack width measuring instrument and the probe. A rear connecting plate 4 is provided on the rear side of the concrete crack width measuring instrument, and a storage box 5 is installed on the rear connecting plate. A lifting assembly 6 is slidably fitted inside the storage box. The probe 3 is rotatably connected to the top of the lifting assembly and locked in place by adjusting bolts 65. The storage assembly is located on the rear connecting plate, and the extension line is wound around the storage assembly. Testing showed that the three-stage telescopic structure exhibited no slippage at a height of 1.5m when the horizontal load reached 5kg. The friction coefficient between the anti-slip adhesive layer and the concrete wall surface was ≥0.8, and it could stably support the equipment's own weight (2.3kg).

[0043] In at least one embodiment, the storage box has an anti-slip adhesive layer 51 on the side away from the concrete crack width measuring instrument. This anti-slip adhesive layer can be used to contact the wall surface and enhance friction. The anti-slip adhesive layer 51 is affixed to the side of the storage box 5 away from the width measuring instrument. The anti-slip adhesive layer material is nitrile rubber with a Shore A hardness of A60. Its dimensions are 120mm in length, 80mm in width, and 2mm in thickness. The surface is provided with diamond-shaped anti-slip patterns 511 (pattern depth 0.5mm, pattern spacing 2mm).

[0044] Compared to existing technologies, which lack a dedicated anti-slip design, the equipment is prone to slipping during testing, affecting accuracy. This solution, through a nitrile rubber anti-slip layer and a diamond-patterned anti-slip texture, significantly enhances friction with the wall surface, ensuring equipment stability during testing and reducing human error.

[0045] In at least one embodiment, the lifting assembly includes an outer tube 61, a middle tube that slides inside the outer tube, an inner rod 63 that slides inside the middle tube, and a lower flange 631 at the top of the inner rod, wherein the lower flange 631 can be welded to the top of the inner rod and has four circumferentially distributed φ5mm through holes.

[0046] The lower flange is fixedly connected to the upper flange 641 by bolts. A hinge seat 64 is welded to the top of the upper flange. A rotating rod 32 is rotatably connected to the hinge seat and locked in place by adjusting bolts 65. A probe 3 is fixedly connected to the top of the rotating rod. Specifically, one end of the rotating rod 32 is rotatably connected to the hinge seat 64 by a φ6mm adjusting bolt, and the other end is welded to the probe 3.

[0047] The plan should be refined, such as Figure 3 As shown, the inner wall of the top of the outer tube has an internal thread, and the outer wall of the bottom of the middle tube has an external thread 621 that mates with the internal thread. The external thread occupies a small distance at the bottom of the middle tube, allowing the middle tube and outer tube to initially slide relative to each other. When the external thread of the middle tube contacts the internal thread of the inner wall of the outer tube, the two can be threadedly connected and locked in place. This connection method is existing technology, drawing on the sliding locking method of existing telescopic clothes hangers. Similarly, the middle tube and outer rod are connected in the same way.

[0048] In practical implementation, the outer tube, middle tube, and inner rod are all 50cm long, with a total telescopic length of 1.5m (from the bottom of the outer tube 61 to the top of the inner rod 63). The inner wall of the top of the outer tube 61 has an M8×1.5 internal thread 611, and the outer wall of the bottom of the middle tube 62 has a corresponding external thread 621. The length of the external thread is 1 / 10 (5cm) of the total length of the middle tube. When the outer tube and the middle tube slide relative to each other until the threaded section contacts, rotating the outer tube will lock the thread, and rotating in the opposite direction will release the lock, achieving sliding contraction. The middle tube 62 and the inner rod 63 are connected using the same threaded connection method. The inner wall of the top of the middle tube has an M8×1.5 internal thread, and the outer wall of the bottom of the inner rod has a corresponding external thread. The length of the threaded section is 1 / 10 of the total length of the inner rod. Given that the existing building height does not exceed 3m and the average height of a person is around 1.7m, the three-section telescopic length of 1.5m is sufficient to measure cracks at different heights of the building, including but not limited to the side walls and ceilings.

[0049] Compared with existing technologies, traditional detection devices rely on an array of adjustment holes for height adjustment, resulting in low accuracy and the inability to achieve continuous adjustment. This invention employs a three-stage telescopic structure combined with a threaded locking mechanism, achieving stepless adjustment within a 1.5m height range. This significantly improves adjustment accuracy and flexibility, meeting the precise detection requirements for cracks at different heights.

[0050] Traditional threaded connections are complex to operate and prone to loosening. This design borrows the sliding locking mechanism from telescopic clothes hangers, using the interplay of internal and external threads to achieve quick locking and unlocking of the lifting assembly, resulting in simple operation and reliable connection.

[0051] In at least one embodiment, a sliding cavity is formed in the middle of the storage box, and an outer tube 61 is slidably fitted inside the sliding cavity. The sliding cavity has an inner diameter of φ35mm and a depth of 25cm, forming a 1mm clearance fit with the outer diameter of the outer tube (φ34mm). The storage box is provided with several threaded holes 52, and a fastening knob 53 is threadedly connected to each threaded hole. The fastening knob can be threadedly connected to the threaded hole and restrict the relative movement between the outer tube and the storage box. The storage box may have two M6 threaded holes 52. The end of the fastening knob is provided with a φ30mm arc-shaped rubber pad 531, and the surface roughness of the rubber pad is Ra6.3.

[0052] After the outer tube is inserted into the sliding cavity, rotate the tightening knob until the rubber pad is pressed against the outer wall of the outer tube (torque value 0.8-1.2 N·m), and fixation is achieved through friction.

[0053] Furthermore, a first rubber layer (1 mm thick) is formed on the inner wall of the sliding cavity, and a second rubber layer (1 mm thick) is formed on the outer wall of the outer tube. When the outer tube is inserted into the sliding cavity, the first rubber layer and / or the second rubber layer undergo elastic deformation. The two layers form an interference fit (0.2 mm) upon insertion, further enhancing the fixing effect.

[0054] This design, through a double-rubber layer interference fit, significantly enhances the friction between the sliding cavity and the outer tube, further improving the stability of the equipment.

[0055] In at least one embodiment, the storage assembly includes two parallel support plates 41 with a spacing of 40mm. The support plates are fixedly connected to the top of the rear connecting plate, which can be done by welding. A rotating shaft 43 is rotatably connected between the two support plates. A winding wheel 42 is mounted on the rotating shaft. The winding wheel 42 has an outer diameter of φ80mm and a width of 30mm. The rim of the wheel has a spiral winding groove 422 (groove width 5mm, depth 3mm), and a rubber anti-slip layer (thickness 1mm, Shore hardness HS60) is pasted on the bottom of the groove. A torsion spring 44 is sleeved on the rotating shaft 43, with one end welded to the support plate 41 and the other end welded to the winding wheel 42. The torsion spring has a wire diameter of 0.8mm, a mean diameter of φ15mm, 8 effective turns, and a stiffness coefficient of 0.5N·mm / °. One end of the extension wire 21 passes sequentially through the mounting hole 421 (φ8mm) on the winding wheel and the hollow cavity of the rotating shaft 43, where an RJ45 plug is inserted into the socket of the connecting wire. The other end is wound 5 times unidirectionally along the spiral winding groove of the winding wheel and then passes through a φ4mm spring clip at the end, forming an interference fit (0.2mm interference) with the slot at the bottom of the probe. Under the action of the torsion spring 44, the extension wire can be automatically retracted, with residual tension ≤0.5N, meeting the probe operation requirements. When the winding wheel needs to rotate, the RJ45 plug of the extension wire will also rotate, and the connection between the extension wire and the connecting wire must be disconnected in advance.

[0056] Compared with existing technologies, traditional connecting wires are inconvenient to store and are prone to tangling or damage. This invention, through the design of a winding wheel and torsion spring, achieves automatic winding and unwinding of the extension wire, effectively preventing tangling and damage to the connecting wire and improving testing efficiency.

[0057] Operating procedure: Loosen the adjusting bolt, rotate the rotating rod, and adjust the probe angle to align the probe with the crack. After adjustment, tighten the adjusting bolt to fix the probe angle. Loosen the fastening knob to allow the outer tube to slide freely within the sliding cavity of the storage box. Depending on the crack height to be measured, extend the outer tube, middle tube, and inner rod to the appropriate length in sequence. For example, if the crack height is approximately 2.2m, simply pull the inner rod out of the middle tube; the two are threaded together. A person's height of 1.7m plus the 0.5m extension height will meet the height requirement. Further adjust the relative displacement between the outer tube and the storage box to align the probe with the crack, then tighten the fastening knob again to ensure the lifting assembly is stable and reliable. Press the anti-slip rubber layer of the storage box firmly against the wall to ensure the stability of the detection device. Start the concrete crack width measuring instrument; the probe captures the crack image and transmits the image data to the concrete crack width measuring instrument for processing and display via the connecting line and extension line.

[0058] 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 descriptions of the above embodiments and specifications 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 protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A concrete crack width detection device, comprising a concrete crack width gauge and a probe, wherein a connecting line and an extension line are provided between the concrete crack width gauge and the probe, characterized in that, The concrete crack width measuring instrument has a rear connecting plate on the rear side, and a storage box is installed on the rear connecting plate. A lifting component is slidably fitted inside the storage box. A probe is rotatably connected to the top of the lifting component and locked and fixed by adjusting bolts. The storage component is provided on the rear connecting plate, and an extension wire is wound on the storage component.

2. The concrete crack width detection device according to claim 1, characterized in that, The storage box has an anti-slip rubber layer on the side away from the concrete crack width measuring instrument.

3. The concrete crack width detection device according to claim 1, characterized in that, The lifting assembly includes an outer tube, a middle tube that slides inside the outer tube, an inner rod that slides inside the middle tube, a lower flange at the top of the inner rod, the lower flange being fixedly connected to an upper flange by bolts, a hinge seat at the top of the upper flange, a rotating rod rotatably connected to the hinge seat and locked in place by adjusting bolts, and a probe fixedly connected to the top of the rotating rod.

4. The concrete crack width detection device according to claim 3, characterized in that, The inner wall at the top of the outer tube has an internal thread, and the outer wall at the bottom of the middle tube has an external thread that mates with the internal thread.

5. The concrete crack width detection device according to claim 3, characterized in that, The storage box has a sliding cavity in the middle, and an outer tube is slidably fitted inside the sliding cavity. The storage box has several threaded holes, and a fastening knob is threaded into each threaded hole. The fastening knob can be threaded into the threaded hole and restrict the relative movement between the outer tube and the storage box.

6. The concrete crack width detection device according to claim 5, characterized in that, The inner wall of the sliding cavity is formed with a first rubber layer, and the outer wall of the outer tube is formed with a second rubber layer. When the outer tube is inserted into the sliding cavity, the first rubber layer and / or the second rubber layer undergo elastic deformation.

7. The concrete crack width detection device according to claim 1, characterized in that, The storage assembly includes two parallel support plates, which are fixedly connected to the top of the rear connecting plate. A rotating shaft is rotatably connected between the two support plates. A winding wheel is mounted on the rotating shaft, and a torsion spring is sleeved on the rotating shaft. One end of the torsion spring is fixedly connected to the support plate, and the other end is fixedly connected to the winding wheel. An extension wire is wound on the winding wheel. The rotating shaft is a hollow tube, and a mounting hole is formed on the winding wheel. One end of the extension wire passes through the mounting hole and the rotating shaft in sequence and extends to the outside to be inserted with the connecting wire. The other end of the extension wire is wound on the winding wheel and then connected to the probe.

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