Crack measuring instrument

By designing structures such as connecting chambers, sliding chambers and brushes in crack measurement instruments, cleaning up wall impurities and fixing probes with suction cups, the problem of coupling agent adsorbing impurities is solved, and detection efficiency and accuracy are improved.

CN119268616APending Publication Date: 2025-01-07GUIZHOU WUJIANG HYDROPOWER DEV +1
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Patent Information

Application Number
CN202411051929.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-08-01
Publication Date
2025-01-07

AI Technical Summary

Technical Problem

When detecting dam cracks, the existing ultrasonic crack measuring instruments, the coupling agent is prone to adsorbing dust and impurities, resulting in inaccurate measurements. The cleaning process increases the consumption of coupling agent and the burden on engineers, affecting the detection efficiency.

Method used

A crack measuring instrument is designed including detection components, protective components and cleaning components. Through the connection bin, sliding bin and brush structure, the cleaning component can remove wall impurities when moving the probe, reduce coupling agent consumption, and be fixed by suction cups. Probe to prevent it from moving.

Benefits of technology

It effectively reduces the consumption of coupling agent, reduces the burden on engineers, and improves the efficiency and accuracy of dam crack detection.

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Abstract

The invention relates to the technical field of dam crack measurement, in particular to a crack measuring instrument which comprises a detection assembly, a crack measuring instrument host, a data line connected with the top of the crack measuring instrument host, and a crack measuring instrument probe connected with one end of the data line. When the depth of the dam crack is measured, the connecting bin is placed on the wall of the dam, and the crack measuring instrument probe is pushed to move, so that the moving blade and the brush are driven to move to sweep impurities on the wall of the dam, and therefore, the coupling agent on the crack measuring instrument probe is prevented from adhering to the impurities such as stones; the coupling agent does not need to be completely scraped off, consumption of the coupling agent is reduced, the amount of the coupling agent carried by an engineer is reduced, the burden of the engineer is relieved, and the efficiency of measuring the depth of the dam crack is improved.
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Description

Technical Field

[0001] The invention relates to the technical field of dam crack measurement, in particular to a crack measuring instrument. Background Art

[0002] In the field of civil engineering, crack detection is crucial for critical infrastructure such as dams. To this end, engineers usually use high-precision ultrasonic crack measuring instruments to assess the depth of cracks. This instrument consists of a crack measuring instrument host and two crack measuring instrument probes connected by a data cable. Its working principle is: one crack measuring instrument probe emits ultrasonic waves, and the other crack measuring instrument probe receives the reflected sound waves. The crack measuring instrument host calculates the round-trip time of the ultrasonic wave to accurately measure the depth of the crack.

[0003] In actual operation, in order to improve the transmission efficiency of ultrasonic waves, the crack measuring probe needs to be coated with coupling agent. Coupling agent is a viscous liquid that can fill the tiny gap between the crack measuring probe and the surface to be measured. However, this liquid easily absorbs dust and impurities when it contacts the wall surface. In order to prevent this situation from affecting the next detection work, engineers will remove the coupling agent on the crack measuring probe when changing the position of the crack measuring probe to ensure that the crack measuring probe will not be attached with impurities like stones that will affect the detection structure. However, this operation method will increase the consumption of coupling agent in actual application. Engineers can only deal with it by carrying more coupling agent, which will increase the burden on engineers during detection and affect the efficiency of dam crack detection. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention is proposed.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a crack measuring instrument, comprising:

[0006] The detection component includes a crack measuring instrument host, a data line connected to the top of the crack measuring instrument host, and a crack measuring instrument probe connected to one end of the data line; and

[0007] A protection assembly is arranged on the outer wall of the crack measuring instrument probe, comprising a connecting bin, a first elastic member connected to the inner wall of the connecting bin, a sliding bin connected to the outer wall of the connecting bin, and a limiting bin connected to one side of the connecting bin; and,

[0008] The cleaning component is arranged on the outer wall of the connecting bin, and comprises a moving page, a connecting piece connected to the outer wall of the moving page, a sliding page arranged on one side of the moving page, and a connecting page arranged on the other side of the moving page.

[0009] As a preferred solution of the crack measuring instrument of the present invention, a square block is installed on the outer wall of the crack measuring instrument probe, a first connecting rod is arranged at the bottom of the square block, and the connecting chamber has a square shape.

[0010] As a preferred solution of the crack measuring instrument of the present invention, the outer wall of the square block is slidably connected to the inner wall of the connecting chamber, and the top of the first elastic member is connected to the bottom of the square block.

[0011] As a preferred solution of the crack measuring instrument of the present invention, one side of the sliding page is connected to the outer wall of the moving page through the connecting member, and one side of the connecting page is connected to the outer wall of the moving page through the connecting member.

[0012] As a preferred solution of the crack measuring instrument of the present invention, one side of the sliding page is slidably connected to the inner wall of the sliding bin, a second connecting rod is installed on the top of the connecting page, and a traction rope is connected to the outer wall of the second connecting rod.

[0013] As a preferred solution of the crack measuring instrument described in the present invention, the outer wall of the connecting bin is connected to a support rod, the outer wall of the traction rope is in contact with the outer wall of the support rod, the top of the traction rope is connected to the first connecting rod, and a brush installation groove is provided at the bottom of the connecting piece.

[0014] As a preferred solution of the crack measuring instrument of the present invention, one side of the connecting member is connected to a second elastic member, and one side of the second elastic member is connected to the inner wall of the sliding chamber.

[0015] As a preferred solution of the crack measuring instrument described in the present invention, wherein: the inner wall of the limit bin is connected to a limit assembly, and the limit assembly includes a long rod, a rotating frame connected to the outer wall of the long rod, a suction cup connected to one side of the rotating frame, and a transmission wheel connected to the outer wall of the long rod.

[0016] As a preferred solution of the crack measuring instrument of the present invention, the outer wall of one side of the long rod is rotatably connected to the inner wall of the limiting bin, and one end of the long rod is rotatably connected to one end of the sliding bin.

[0017] As a preferred solution of the crack measuring instrument of the present invention, the outer wall of the limit bin is connected with a magnet, the outer wall of the magnet is magnetically connected to the outer wall of the rotating frame, and the outer wall of the transmission wheel is meshed with the outer wall of the connecting member.

[0018] The beneficial effects of the present invention are as follows: when measuring the crack depth of a dam, the connection chamber is placed on the wall of the dam, and the crack measuring instrument probe is pushed to move, thereby driving the moving page and the brush to move, so as to clean the impurities on the dam wall, thereby preventing the coupling agent on the crack measuring instrument probe from adhering to impurities such as stones, so that when the crack measuring instrument probe is changed, the coupling agent does not need to be completely scraped off, thereby reducing the consumption of the coupling agent, thereby reducing the amount of coupling agent that engineers carry, alleviating the burden on engineers, and improving the efficiency of measuring the crack depth of the dam;

[0019] At the same time, when the mobile page moves, the connecting part will drive the transmission wheel and the rotating frame to rotate, so that the suction cup can contact the dam wall. Pressing the suction cup can make the suction cup adsorbed on the dam wall. In this way, when the engineer holds the crack measuring instrument probe, the suction cup can help fix the crack measuring instrument probe, thereby preventing the crack measuring instrument probe from moving during detection work, thereby improving the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the structure of the detection component in the present invention.

[0023] Figure 3 It is a schematic diagram of the parts of the detection component in the present invention.

[0024] Figure 4 It is a connection diagram of the protection component and the limiting component in the present invention.

[0025] Figure 5 It is a schematic diagram of the structure of the protection component in the present invention.

[0026] Figure 6 It is an exploded view of the protection component in the present invention.

[0027] Figure 7 It is a schematic diagram of the structure of the cleaning component in the present invention.

[0028] Figure 8 It is a structural schematic diagram of the cleaning component in the present invention from another side perspective.

[0029] Fig. 9 It is a schematic diagram of the structure of the limiting component in the present invention. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0033] Example 1

[0034] Reference Figures 1 to 9 , which is the first embodiment of the present invention, provides a crack measuring instrument that can protect the safety of the bottom detection area of ​​the crack measuring instrument probe 103.

[0035] Specifically, it includes a detection component 100, including a crack measuring instrument host 101, a data line 102 connected to the top of the crack measuring instrument host 101, and a crack measuring instrument probe 103 connected to one end of the data line 102, wherein the crack measuring instrument host 101, the data line 102 and the crack measuring instrument probe 103 are a complete set of crack measuring instruments, and its model is HC-CS202 crack depth measuring instrument, and the structure and principle thereof can be known by those skilled in the art through technical manuals or conventional experimental methods;

[0036] It needs to be explained that when performing measurements, it is necessary to plan the measurement area on the wall in advance. The probe can only perform measurements within the circled measurement area, and there can be multiple measurement areas.

[0037] The protection component 200 is arranged on the outer wall of the crack measuring instrument probe 103, and includes a connecting compartment 201, a first elastic member 202 connected to the inner wall of the connecting compartment 201, a sliding compartment 203 connected to the outer wall of the connecting compartment 201, and a limit compartment 204 connected to one side of the connecting compartment 201, wherein the connecting compartment 201 is wrapped around the outer wall of the crack measuring instrument probe 103. When the crack measuring instrument probe 103 is not in use, the semi-sealed setting of the connecting compartment 201 can prevent foreign objects from damaging the crack measuring instrument probe 103;

[0038] It should be noted that an opening is provided at the bottom of the connecting compartment 201 .

[0039] A square block 104 is installed on the outer wall of the crack measuring instrument probe 103, and a first connecting rod 105 is arranged at the bottom of the square block 104. The connecting chamber 201 has a square shape, wherein the four sides of the square block 104 arranged at the bottom of the crack measuring instrument probe 103 are provided with notches, and protrusions are arranged on the four inner walls of the connecting chamber 201. The width of the protrusion is the same as the width of the notch, and when the connecting chamber 201 and the crack measuring instrument probe 103 are assembled, the protrusion and the notch are engaged with each other, and the protrusion can slide in the notch, thereby limiting the moving direction of the connecting chamber 201.

[0040] The outer wall of the square block 104 is slidably connected to the inner wall of the connecting chamber 201, and the top of the first elastic member 202 is connected to the bottom of the square block 104. Four first elastic members 202 are arranged in the connecting chamber 201, and the bottoms of the four first elastic members 202 are respectively connected to the four corners of the bottom of the inner wall of the connecting chamber 201, and the tops of the four first elastic members 202 are respectively connected to the four corners of the bottom of the outer wall of the square block 104;

[0041] It should be noted that the first elastic member 202 is a coil spring.

[0042] In summary, when using the crack measuring instrument probe 103 to detect the depth of the dam crack, the connecting chamber 201 is attached to the wall of the dam, and then the crack measuring instrument probe 103 is pushed so that the crack measuring instrument probe 103 squeezes the first elastic member 202 and moves to the opening at the bottom of the connecting chamber 201. Finally, the crack measuring instrument probe 103 contacts the wall to detect the crack depth. When the detection is completed, the first elastic member 202 will push the connecting chamber 201 back to its original position, thereby protecting the crack measuring instrument probe 103 and preventing the crack measuring instrument probe 103 from hitting other objects and being damaged.

[0043] Example 2

[0044] Reference Figures 1 to 9 , which is the second embodiment of the present invention. This embodiment is based on the previous embodiment, but the difference is that this embodiment can clean the impurities on the wall and prevent stones from adhering to the crack measuring instrument probe 103.

[0045] Specifically, it includes a cleaning component 300, which is arranged on the outer wall of the connecting chamber 201, including a moving page 301, a connecting piece 302 connected to the outer wall of the moving page 301, a sliding page 303 arranged on one side of the moving page 301, and a connecting page 304 arranged on the other side of the moving page 301, wherein there are a plurality of moving pages 301, and the plurality of moving pages 301 are mutually connected through the connecting piece 302, so that the plurality of moving pages 301 form a sealing curtain with a rotatable joint, and the sliding page 303 is connected to one side of the sealing curtain, and the connecting page 304 is connected to the other side of the sealing curtain;

[0046] It should be noted that the overall shape of the connecting member 302 is T-shaped, with connecting holes on both sides, and no connecting holes are provided on the protruding portion at the bottom. When other components are connected to the connecting member 302, they are connected to the connecting holes on the connecting member 302 through the rotating shaft.

[0047] It should be noted that two groups of symmetrical cleaning components 300 are arranged at the bottom opening of the connecting chamber 201 .

[0048] One side of the sliding page 303 is connected to the outer wall of the moving page 301 through the connecting piece 302, and one side of the connecting page 304 is connected to the outer wall of the moving page 301 through the connecting piece 302, wherein rotating shafts are arranged on both sides of the sliding page 303, and slideways are arranged on both sides of the bottom of the connecting bin 201, and the rotating shaft is located in the slideway. When the sliding page 303 is pulled, the rotating shaft will slide in the slideway.

[0049] One side of the sliding page 303 is slidably connected to the inner wall of the sliding bin 203, a second connecting rod 305 is installed on the top of the connecting page 304, and a traction rope 306 is connected to the outer wall of the second connecting rod 305, wherein the second connecting rod 305 is placed upward, and when the traction rope 306 moves upward, it will drive the connecting page 304 and the movable page 301 and the sliding page 303 to move successively.

[0050] The outer wall of the connecting bin 201 is connected to the support rod 205, the outer wall of the traction rope 306 is in contact with the outer wall of the support rod 205, the top of the traction rope 306 is connected to the first connecting rod 105, and a brush installation groove 307 is arranged at the bottom of the connecting piece 302, wherein, when the first connecting rod 105 moves downward, the traction rope 306 will be pulled to move downward, so as to achieve the above-mentioned, driving the connecting page 304 and the moving page 301 and the sliding page 303 to move successively, and when a brush is installed in the brush installation groove 307, when the moving page 301 moves, the brush will clean the debris on the wall, thereby ensuring that no debris will be attached to the crack measuring instrument probe 103 when the crack measuring instrument probe 103 is performing detection work.

[0051] One side of the connecting member 302 is connected to a second elastic member 308 , and one side of the second elastic member 308 is connected to the inner wall of the sliding compartment 203 , wherein the second elastic member 308 is a coil spring.

[0052] In summary, when the connecting chamber 201 is placed on the wall of the dam and the crack measuring instrument probe 103 is pushed, the square block 104 will pull the traction rope 306 downward, so that the traction rope 306 pulls the connecting page 304, the moving page 301 and the sliding page 303 to move. At this time, the two sets of cleaning components at the opening of the connecting chamber 201 will open to both sides. While the cleaning components are opening, the brushes in the brush mounting grooves 307 will brush off the debris on the wall. In this way, when the crack measuring instrument probe 103 is attached to the wall of the dam with the coupling agent, the crack measuring instrument probe 103 will not be stuck with stones or other impurities, thereby ensuring the accuracy of the crack measuring instrument probe 103 during detection. At this time, when the crack measuring instrument probe 103 moves to the next area for measurement, there is no need to scrape off all the coupling agent on the crack measuring instrument probe 103, thereby reducing the consumption of coupling agent, reducing the burden on engineers, and improving the efficiency of measurement.

[0053] Example 3

[0054] Reference Figures 1 to 9 , which is the third embodiment of the present invention, is based on the previous embodiment, but is different in that this embodiment can help engineers quickly locate the crack measuring instrument probe 103 to prevent the crack measuring instrument probe 103 from moving randomly during detection.

[0055] Specifically, the inner wall of the limit bin 204 is connected to the limit assembly 400, and the limit assembly 400 includes a long rod 401, a rotating frame 402 connected to the outer wall of the long rod 401, a suction cup 403 connected to one side of the rotating frame 402, and a transmission wheel 404 connected to the outer wall of the long rod 401, wherein a part of the transmission wheel 404 is provided with teeth, and when the transmission wheel 404 rotates, it will drive the long rod 401, the rotating frame 402 and the suction cup 403 to rotate, so that the suction cup 403 will contact the wall. At this time, pressing the suction cup 403 makes the suction cup 403 adsorbed on the wall, thereby limiting the moving range of the connection bin 201.

[0056] The outer wall of one side of the long rod 401 is rotatably connected to the inner wall of the limiting bin 204 , and one end of the long rod 401 is rotatably connected to one end of the sliding bin 203 , wherein the two ends of the long rod 401 are rotatably connected to one end of the two sliding bins 203 respectively, and the long rod 401 is located in the limiting bin 204 .

[0057] The outer wall of the limit bin 204 is connected to a magnet 206, and the outer wall of the magnet 206 is magnetically connected to the outer wall of the rotating frame 402, and the outer wall of the transmission wheel 404 is meshed with the outer wall of the connecting member 302. When the connecting member 302 moves, it will drive the transmission wheel 404 to rotate. After the rotating frame 402 rotates 90°, the portion of the transmission wheel 404 that is not provided with teeth will face the remaining connecting member 302. At this time, when the connecting member 302 moves, the connecting member 302 cannot drive the rotating frame 402 to continue rotating. Only when the connecting member 302 moves in the opposite direction can it drive the transmission wheel 404 and the rotating frame 402 to move in the opposite direction. When the rotating frame 402 rotates 90° in the opposite direction, the portion of the transmission wheel 404 that is not provided with teeth will face the connecting member 302 again, so that the rotation range of the rotating frame 402 can be limited to 90°.

[0058] At the same time, an opening is provided on the limit bin 204 for the rotating frame 402 to rotate, and magnets 206 are provided on both sides of the opening which are perpendicular to each other. When the rotating frame 402 rotates to the edge of the opening, it can be attracted by the magnets 206, so that the moving trajectory of the rotating frame 402 can be limited, thereby preventing the rotating frame 402 from moving at will.

[0059] In summary, when the connecting member 302 moves, it will drive the transmission wheel 404 to rotate, and the transmission wheel 404 will drive the rotating frame 402 and the suction cup 403 to rotate, so that the suction cup 403 contacts the dam wall. When the suction cup 403 moves to the dam wall, the suction cup 403 is pressed so that the suction cup 403 is adsorbed on the wall. In this way, when the engineer holds the crack measuring instrument probe 103, the suction cup 403 can help fix the crack measuring instrument probe 103, thereby preventing the crack measuring instrument probe 103 from moving during the detection work.

[0060] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0061] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0062] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A crack measuring instrument, characterized in that: include, A detection assembly (100) comprises a crack measuring instrument host (101), a data line (102) connected to the top of the crack measuring instrument host (101), and a crack measuring instrument probe (103) connected to one end of the data line (102); and, A protection component (200) is arranged on the outer wall of a crack measuring instrument probe (103), comprising a connection compartment (201), a first elastic member (202) connected to the inner wall of the connection compartment (201), a sliding compartment (203) connected to the outer wall of the connection compartment (201), and a limit compartment (204) connected to one side of the connection compartment (201); and The cleaning component (300) is arranged on the outer wall of the connecting chamber (201), and comprises a movable page (301), a connecting piece (302) connected to the outer wall of the movable page (301), a sliding page (303) arranged on one side of the movable page (301), and a connecting page (304) arranged on the other side of the movable page (301).

2. The crack measuring instrument according to claim 1, characterized in that: A square block (104) is installed on the outer wall of the crack measuring instrument probe (103), a first connecting rod (105) is arranged at the bottom of the square block (104), and the connecting chamber (201) has a square shape.

3. The crack measuring instrument according to claim 2, characterized in that: The outer wall of the square block (104) is slidably connected to the inner wall of the connecting chamber (201), and the top of the first elastic member (202) is connected to the bottom of the square block (104).

4. The crack measuring instrument according to claim 3, characterized in that: One side of the sliding page (303) is connected to the outer wall of the moving page (301) through the connecting piece (302), and one side of the connecting page (304) is connected to the outer wall of the moving page (301) through the connecting piece (302).

5. The crack measuring instrument according to claim 4, characterized in that: One side of the sliding page (303) is slidably connected to the inner wall of the sliding bin (203), a second connecting rod (305) is installed on the top of the connecting page (304), and a traction rope (306) is connected to the outer wall of the second connecting rod (305).

6. The crack measuring instrument according to claim 5, characterized in that: The outer wall of the connecting bin (201) is connected to a support rod (205), the outer wall of the traction rope (306) is in contact with the outer wall of the support rod (205), the top of the traction rope (306) is connected to the first connecting rod (105), and the bottom of the connecting piece (302) is provided with a brush installation groove (307).

7. The crack measuring instrument according to claim 6, characterized in that: One side of the connecting member (302) is connected to a second elastic member (308), and one side of the second elastic member (308) is connected to the inner wall of the sliding bin (203).

8. The crack measuring instrument according to claim 7, characterized in that: The inner wall of the limit bin (204) is connected to a limit assembly (400), and the limit assembly (400) comprises a long rod (401), a rotating frame (402) connected to the outer wall of the long rod (401), a suction cup (403) connected to one side of the rotating frame (402), and a transmission wheel (404) connected to the outer wall of the long rod (401).

9. The crack measuring instrument according to claim 8, characterized in that: An outer wall on one side of the long rod (401) is rotatably connected to an inner wall of the limiting bin (204), and one end of the long rod (401) is rotatably connected to one end of the sliding bin (203).

10. The crack measuring instrument according to claim 9, characterized in that: The outer wall of the limiting bin (204) is connected to a magnet (206), the outer wall of the magnet (206) is magnetically connected to the outer wall of the rotating frame (402), and the outer wall of the transmission wheel (404) is meshed with the outer wall of the connecting member (302).