Crack width gauge

Abstract

The utility model relates to the field of building detection equipment, in particular to a crack width gauge. The crack width gauge comprises a width gauge body, a probe and a connecting line, the connecting line is used for connecting the width gauge body and the probe, the crack width gauge further comprises a telescopic rod, and the telescopic end of the telescopic rod is movably connected with the probe; a protective shell is arranged on the probe, and the protective shell is detachably connected with the probe; a clamping groove is formed in the bottom of the protective shell, a groove is formed in the top of the protective shell, and the clamping groove is communicated with the groove; the probe is inserted into the clamping groove from the lower part; and a lens of the probe penetrates through the clamping groove and is arranged in the groove. The escalator crack detection device is suitable for crack detection at a high place, reduces the use of escalators, and improves the detection convenience.

Description

Technical Field

[0001] This utility model relates to the field of building inspection equipment, and in particular to a crack width measuring instrument. Background Technology

[0002] The primary function of a crack width gauge is to detect and record the width of cracks in concrete structures (such as bridges, tunnels, and buildings) to ensure structural safety. Crack detection in bridges is a crucial step in ensuring their safe operation. Crack width gauges can perform detailed inspections of critical components such as bridge beams and piers, identifying cracks that may affect the bridge's load-bearing capacity. Once cracks are found to exceed safe limits, timely reinforcement or repair measures can be taken to prevent accidents.

[0003] Existing crack width gauges primarily use handheld probes that cannot be extended. During on-site inspections, cracks are located at varying elevations, with some higher areas often inaccessible to inspectors. Therefore, inspectors typically carry extension ladders to move around the site, which is extremely inconvenient. While some instruments now feature extendable probes, these are fixed to a telescopic rod and cannot rotate. When extended, the probe lens often cannot be directly aligned with the crack, affecting accuracy. Achieving proper alignment requires significant time for inspectors to adjust the position. Furthermore, extended probes increase the difficulty of control, making the lens more susceptible to rubbing against building materials and damaging it.

[0004] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a crack width measuring instrument, which aims to solve the technical problems in the prior art where the probe is difficult to align with the crack after being extended, and the lens is easily scratched.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A crack width measuring instrument includes a measuring instrument body, a probe, and a connecting cable. The connecting cable connects the measuring instrument body and the probe. The instrument also includes a telescopic rod, the telescopic end of which is movably connected to the probe. A protective shell is provided on the probe, and the protective shell is detachably connected to the probe. The bottom of the protective shell has a slot, and the top has a groove, with the slot communicating with the groove. The probe is inserted into the slot from below. The lens of the probe passes through the slot and is placed in the groove.

[0008] In the crack width measuring instrument, the left and right sides of the probe are movably connected to the telescopic rod, respectively; the front and rear sides of the protective shell are outwardly convex arc surfaces; and the top surface of the protective shell is a plane.

[0009] The crack width measuring instrument mentioned above, wherein the front and rear sides of the protective shell are provided with anti-slip textures.

[0010] In the aforementioned crack width measuring instrument, the depth of the groove is greater than the height of the lens.

[0011] The crack width measuring instrument, wherein the telescopic rod includes a handheld rod, multiple first movable rods, and a second movable rod that are slidably connected in sequence; the probe is movably connected to the outer end of the second movable rod.

[0012] In the crack width measuring instrument, the outer end of the second movable rod is provided with two support parts; the probe is disposed between the two support parts and is movably connected to the two support parts.

[0013] In the crack width measuring instrument, the left and right sides of the probe are respectively provided with rotating shafts; the support part is provided with a through hole on the side wall facing the probe, and the rotating shaft is inserted into the through hole.

[0014] The crack width measuring instrument, wherein the handheld rod, multiple first movable rods, second movable rods, and rotating shaft are hollow structures; one end of the connecting line passes sequentially through the handheld rod, multiple first movable rods, second movable rods, support part, and rotating shaft, and is connected to the probe.

[0015] The crack width measuring instrument includes a first cavity inside the handheld rod; a first annular protrusion at the bottom end of the first movable rod; the first annular protrusion is disposed in the first cavity and moves along the length of the first cavity; a second cavity inside the first movable rod; a second annular protrusion at the bottom end of the second movable rod; the second annular protrusion is disposed in the second cavity and moves along the length of the second cavity.

[0016] Beneficial effects: This utility model provides a crack width measuring instrument. The instrument features a telescopic rod with a probe movably connected to it, allowing the probe's angle to be adjusted as needed for precise crack alignment. Furthermore, the probe is equipped with a protective shell, which significantly reduces the risk of lens scratches and extends the probe's lifespan. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a crack width measuring instrument.

[0018] Figure 2 This is a schematic diagram of the protective shell.

[0019] Figure 3 This is a schematic diagram of the probe's structure.

[0020] Figure 4 This is a schematic diagram of the telescopic rod.

[0021] Figure 5 This is a schematic diagram of the top structure of the second movable rod.

[0022] Figure 6 This is a schematic diagram of the internal structure of the telescopic rod.

[0023] Explanation of main component symbols: 1-width measuring instrument body, 2-probe, 3-connecting cable, 4-telescopic rod, 5-protective shell, 51-slot, 52-groove, 53-anti-slip texture, 41-hand handle, 42-first movable rod, 43-second movable rod, 431-support part, 21-rotating shaft, 411-first cavity, 421-first annular protrusion, 422-second cavity, 431-second annular protrusion. Detailed Implementation

[0024] This utility model provides a crack width measuring instrument. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0025] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this utility model. Furthermore, "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0026] Please see Figures 1-3This utility model provides a crack width measuring instrument, including a measuring instrument body 1, a probe 2, and a connecting cable 3. The connecting cable 3 connects the measuring instrument body 1 and the probe 2. It also includes a telescopic rod 4, the telescopic end of which is movably connected to the probe 2. A protective shell 5 is provided on the probe 2, and the protective shell 5 is detachably connected to the probe 2. The bottom of the protective shell 5 has a slot 51, and the top has a groove 52, with the slot 51 communicating with the groove 52. The probe 2 is inserted into the slot 51 from below. The lens of the probe 2 passes through the slot 51 and is placed in the groove 52. Specifically, the lens of the probe 2 is located in the groove 52 and does not protrude from the protective shell 5. When a scratch occurs, the protective shell 5 will only scratch the protective shell 5, without damaging the lens. When using this invention, when facing a high crack, the telescopic rod 4 can be extended to bring the probe 2 close to the crack. Since the probe 2 can rotate, the orientation of the probe 2 can be adjusted in advance according to the position of the crack before extension, thus solving the problem of difficulty in facing the crack directly.

[0027] Please see Figures 1-3 In one embodiment, the left and right sides of the probe 2 are movably connected to the telescopic rod 4; the front and rear sides of the protective shell 5 are outwardly convex arc surfaces; and the top surface of the protective shell 5 is a flat surface. In use, if it is found that the lens of the probe 2 cannot be directly facing the crack after the telescopic rod 4 is extended, the protective shell 5 can be brought into contact with the surface of the subject being measured. Then, the probe 2 can be rotated through the protective shell 5. When the top surface of the protective shell 5 rotates to contact the surface of the subject being measured, the lens of the probe 2 is directly facing the surface of the subject being measured, thus allowing it to directly face the crack on the surface of the subject being measured. The outwardly convex arc surfaces of the front and rear sides of the protective shell 5 facilitate rotation, while the flat top surface of the protective shell 5 allows for a fixed posture after contact with the surface of the subject being measured.

[0028] Please see Figure 2 In one embodiment, the front and rear sides of the protective shell 5 are provided with anti-slip textures 53. The anti-slip textures 53 are used to increase the friction between the front and rear sides of the protective shell 5 and other object surfaces, thereby making it easier to rotate the protective shell 5 by manipulating the telescopic rod 4.

[0029] Preferably, the depth of the groove 52 is greater than the height of the lens, which can prevent the lens from protruding from the groove 52.

[0030] Please see Figure 4In one embodiment, the telescopic rod 4 includes a handheld rod 41, multiple first movable rods 42, and a second movable rod 43 that are slidably connected in sequence; the probe 2 is movably connected to the outer end of the second movable rod 43. In this embodiment, when the telescopic rod 4 is retracted, the second movable rod 43 retracts into the first movable rod 42, and the first movable rod 42 retracts into the handheld rod 41.

[0031] Please see Figure 5 In one embodiment, the outer end of the second movable rod 43 is provided with two support portions 431; the probe 2 is disposed between the two support portions 431 and is movably connected to the two support portions 431. Specifically, the probe 2 is movably connected to the top of the two support portions 431, and the length of the support portion 431 is less than the length of the probe 2, thereby avoiding the support portion 431 from affecting the rotation of the probe 2.

[0032] Please see Figure 5 The probe 2 has a rotating shaft 21 on its left and right sides respectively; the support part 431 has a through hole on its side facing the probe 2, and the rotating shaft 21 is inserted into the through hole.

[0033] Please see Figure 6 In one embodiment, the handheld lever 41, the multiple first movable levers 42, the second movable levers 43, and the rotating shaft 21 are hollow structures; one end of the connecting wire 3 passes sequentially through the handheld lever 41, the multiple first movable levers 42, the second movable levers 43, the support part 431, and the rotating shaft 21, and connects to the probe 2. By concealing part of the connecting wire 3 inside the telescopic lever 4, the surface of the structure can be made simpler, and the contact friction between the connecting wire 3 and the surface of other objects can be reduced, thus reducing the risk of damage to the connecting wire 3.

[0034] Please see Figure 6 In one embodiment, the handheld lever 41 has a first cavity 411; the bottom end of the first movable lever 42 has a first annular protrusion 421; the first annular protrusion 421 is disposed within the first cavity 411 and moves along the length of the first cavity 411; the first movable lever 42 has a second cavity 422; the bottom end of the second movable lever 43 has a second annular protrusion 431; the second annular protrusion 431 is disposed within the second cavity 422 and moves along the length of the second cavity 422. The top of the handheld lever 41 has a channel through which the first movable lever 42 passes; the outer diameter of the first annular protrusion 421 is larger than the diameter of the channel, thereby restricting the first annular protrusion 421 to move only within the first cavity 411, preventing the first movable lever 42 from dislodging from the first cavity 411 when pulled out. The first movable lever 42 adopts a similar structure to the handheld lever 41 to prevent the second movable lever 43 from dislodging.

[0035] In summary, this invention, by incorporating a telescopic rod 4 and a movable probe 2, allows inspectors to move more easily around the inspection site when inspecting cracks located at higher positions, without the need for ladders or other auxiliary tools. During inspection, the probe 2 can also be flexibly adjusted to ensure its lens is directly facing the crack, guaranteeing inspection accuracy.

[0036] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of the appended claims of this utility model.

Claims

1. A crack width measuring instrument, comprising an instrument body, a probe, and a connecting cable, wherein the connecting cable is used to connect the instrument body and the probe, characterized in that, It also includes a telescopic rod, the telescopic end of which is movably connected to the probe; the probe is provided with a protective shell, which is detachably connected to the probe; the bottom of the protective shell is provided with a slot, and the top of the protective shell is provided with a groove, which communicates with the groove; the probe is inserted into the slot from below; the lens of the probe passes through the slot and is placed in the groove.

2. The crack width measuring instrument according to claim 1, characterized in that, The left and right sides of the probe are movably connected to the telescopic rod, respectively; the front and rear sides of the protective shell are outwardly convex arc surfaces; the top surface of the protective shell is a flat surface.

3. The crack width measuring instrument according to claim 2, characterized in that, The protective shell has anti-slip textures on its front and rear sides.

4. The crack width measuring instrument according to claim 1, characterized in that, The depth of the groove is greater than the height of the lens.

5. The crack width measuring instrument according to claim 2, characterized in that, The telescopic rod includes a handheld rod, multiple first movable rods, and a second movable rod that are slidably connected in sequence; the probe is movably connected to the outer end of the second movable rod.

6. The crack width measuring instrument according to claim 5, characterized in that, The outer end of the second movable rod is provided with two support parts; the probe is disposed between the two support parts and is movably connected to the two support parts.

7. The crack width measuring instrument according to claim 6, characterized in that, The probe has a rotating shaft on its left and right sides respectively; the support has a through hole on its side facing the probe, and the rotating shaft is inserted into the through hole.

8. The crack width measuring instrument according to claim 7, characterized in that, The handheld lever, multiple first movable levers, second movable levers, and rotating shaft are hollow structures; one end of the connecting line passes sequentially through the handheld lever, multiple first movable levers, second movable levers, support part, and rotating shaft, and is connected to the probe.

9. The crack width measuring instrument according to claim 5, characterized in that, The handheld lever has a first cavity; the bottom end of the first movable lever has a first annular protrusion; the first annular protrusion is located in the first cavity and moves along the length of the first cavity; the first movable lever has a second cavity; the bottom end of the second movable lever has a second annular protrusion; the second annular protrusion is located in the second cavity and moves along the length of the second cavity.

Images