A concrete crack width measuring instrument

Abstract

The application discloses a concrete crack width measuring instrument, and relates to the technical field of crack width measuring instruments, comprising a width measuring instrument main body and a protection and cleaning device; the protection and cleaning device is provided, that is, first and second doors are arranged on the two sides of the protection shell, the round hole can be blocked, the detection end can be blocked and protected when the measuring probe is not used, meanwhile, the protection shell can directly avoid the abrasion problem of the detection end during subsequent movement measurement, when the two sides of the shrink plates are extruded, the two doors can be opened in linkage to normally measure, meanwhile, the linkage operation of the dust removal assembly and the cleaning assembly can be realized, dust can be sucked and discharged outside, and the measuring position can be cleaned by brushing, so that the measuring position is kept clean, and the crack measurement accuracy is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of crack width measuring instrument, in particular to a concrete crack width measuring instrument. BACKGROUND

[0002] The crack width measuring instrument is an instrument for detecting the crack width and surface micro defects in the concrete structure. The crack width measuring instrument is connected with a display screen and a measuring probe by a cable during use. The power switch is turned on, and the two legs of the measuring probe are placed on the crack. The magnified crack image can be seen on the display screen. The camera is slightly rotated to make the crack image perpendicular to the scale. The crack width value is read according to the length of the scale line occupied by the crack image.

[0003] The existing application No. CN202421111033.9 is a hand-held crack width measuring instrument, which comprises a measuring instrument main body having a connecting part, a holding part, a power cord and a detection end. The connecting part and the holding part are sequentially arranged at the bottom of the measuring instrument main body. The measuring instrument main body and the connecting part are fixedly connected by welding. The measuring instrument main body is provided with a wire guide plate on one side. The wire guide plate is internally connected with the power cord. The power cord extends to the inside of the measuring instrument main body and is connected with a winding assembly.

[0004] The above-mentioned existing device can effectively prevent the display panel from being dusty when not in use. The holding part can be externally provided with an anti-slip sleeve to improve the holding feeling during use. However, the dustproof plate needs to be manually opened and closed during use. The protective state of the measuring probe cannot be adjusted according to the abutting movement of the measuring probe and the concrete structure. In addition, the external cleanliness during measurement can easily affect the measurement accuracy. The existing technology generally needs to be cleaned manually before crack width measurement, which affects the overall measurement efficiency. SUMMARY

[0005] The present application aims to provide a concrete crack width measuring instrument to solve the problems in the background art.

[0006] In order to achieve the above object, the present application adopts the following technical scheme: a concrete crack width measuring instrument, comprising a width measuring instrument main body, a key is arranged at the right side of the front end of the width measuring instrument main body, a cable is connected to the top of the width measuring instrument main body, a measuring probe is connected to the end of the cable away from the width measuring instrument main body, and a protective cleaning device is arranged outside the measuring probe, the protective cleaning device comprises a connecting plate, the connecting plate is installed outside the measuring probe, guide shells are fixedly connected to the front end of the connecting plate, a protective shell is installed between the two guide shells, the rear side of the protective shell is connected to the front side of the measuring probe, a circular hole is formed in the middle of the front side of the protective shell, a contraction plate is slidably connected to the front side of the guide shell, the side edge of the contraction plate is connected to an opening and closing assembly, the opening and closing assembly is installed inside the protective shell, a dust removal assembly is installed inside the front side of the contraction plate, and a cleaning assembly is arranged at the lower end of the protective shell and connected to the protective shell and the side edge of the contraction plate.

[0007] Preferably, the opening and closing assembly comprises a first shutter, the first shutter is slidably installed inside the protective shell, a second shutter is arranged at the right side of the first shutter, a moving structure is connected to the rear side of the first shutter and the second shutter, a damper is inserted into the rear side of the contraction plate, the rear side of the damper is connected to the connecting plate, and a spring is installed on the front end of the damper.

[0008] Preferably, the moving structure comprises a rack, the rack is embedded in the inside of one side of the contraction plate, the outer side of the rack is meshingly connected with a gear, the gear is installed inside the protective shell, a rotating shaft is vertically connected to the middle of the gear, a driving wheel is connected to the upper end of the rotating shaft, a belt is drivingly connected to the outer part of the driving wheel, the belt is connected to a driven wheel at the side away from the driving wheel, a connecting frame is installed on the outer part of the belt, and the front side of the connecting frame is fixedly connected with the first shutter or the second shutter.

[0009] Preferably, the dust removal assembly comprises a roller, the roller is rotatably connected to the front side of the contraction plate, a belt pulley group is connected to the side edge of the roller, the rear side of the belt pulley group is connected with a ratchet structure, the ratchet structure is embedded in the inside of the front side of the contraction plate, and the side away from the belt pulley group of the ratchet structure is connected to a fan blade.

[0010] Preferably, the ratchet structure comprises a fixed plate, the fixed plate is fixedly connected to the inside of the front side of the contraction plate, a connecting shaft is rotatably connected to the middle of one side of the fixed plate, the outer side of the connecting shaft is connected with the belt pulley group, spring sheets are equidistantly arranged on the inner side of the connecting shaft, the spring sheets are embedded in the inner side of an inner ratchet, the inner ratchet is rotatably connected to the other side of the middle of the fixed plate, and the outer end of the fixed plate is connected to the fan blade.

[0011] Preferably, the cleaning assembly comprises a brush plate arranged at the lower end of the protective shell, and the top of the fixing plate is fixedly connected with limiting blocks on both sides, the limiting blocks are embedded in the inner part of the lower end of the guide shell, the brush plate is connected with the push-pull assembly on both sides, and the push-pull assembly is installed on the side edge of the guide shell.

[0012] Preferably, the push-pull assembly comprises a butt joint strip arranged at the side edge of the guide shell, and the lower end of the butt joint strip is connected with the brush plate, the upper end of the butt joint strip is rotatably connected with a first connecting arm, the rear side of the first connecting arm is rotatably connected with a second connecting arm, the front side of the second connecting arm is butt jointed with a transmission arm, the front side of the transmission arm is installed with a connecting shaft, the connecting shaft is inserted into the inner part of the contraction plate, the front end side of the second connecting arm is rotatably connected with a supporting strip, and the rear side of the supporting strip is bolted with the connecting plate.

[0013] Preferably, the outer side of the contraction plate is provided with an inclined groove, and the contraction plate is butt jointed with the connecting shaft through the inclined groove.

[0014] Preferably, the first and second blocking doors are horizontally limited and slidably arranged in the inner part of the protective shell on both sides, and the abutting position of the first and second blocking doors is longitudinally opposite to the circular hole.

[0015] Preferably, the spring sheets are arc-shaped strips and are equidistantly installed on one end of the outer side of the butt joint shaft, and the spring sheets on both sides are embedded into the end of the inner ratchet tooth groove.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] 1、The protective cleaning device is arranged on both sides of the protective shell, that is, the first and second blocking doors arranged on both sides of the protective shell can block the circular hole, so that the detection end is blocked and protected when the measurement probe is not used, and the protective shell can directly avoid the abrasion of the detection end during subsequent movement measurement, and when the two contraction plates are extruded, the linkage opening of the two blocking doors for normal measurement can be realized, and the linkage operation of the dust removal assembly and the cleaning assembly can also be realized, dust is sucked and discharged outside, and the cleaning is brushed, so that the measurement position is kept clean, and the crack measurement accuracy is improved.

[0018] 2. The design of the shrink plate and opening / closing assembly allows the shrink plates on both sides to move inward along the guide shell when the measuring probe is compressed. This simultaneously drives the rack embedded on one side, enabling the rack and gear to drive each other. The gear, through the rotating shaft, enables the synchronous rotation of the driving wheel, belt, and driven wheel. The connecting frame connected to the outside of the belt can open the first and second gates on both sides inside the protective shell laterally through the forward and reverse rotation of the belt, allowing the measuring probe to be used normally. At the same time, when the shrink plates on both sides move inward, the dampers and springs on both rear sides provide a restoring force to indirectly satisfy the automatic closing transmission of the first and second gates on both sides. This ensures that the probe end is automatically closed when not in use, preventing damage to the probe end.

[0019] 3. The dust removal component is designed so that when the measuring probe is moved for measurement, the rollers located on the front side of the shrink plate improve the smoothness of movement while allowing the pulley set connected to one side to rotate. When the pulley set rotates, it allows the docking shaft connected to one side of the fixed plate to rotate, enabling the docking shaft to rotate the spring plates equidistantly located at one end. In this way, the spring plates on each side can abut against the toothed end of the inner ratchet when rotating forward, driving the inner ratchet to rotate. This causes the fan blades connected to the outer end of the inner ratchet to rotate forward, generating a positive rotational suction force to meet the airflow requirements of the measurement position, improving the cleanliness of the measurement position and enhancing the accuracy of the measurement data. If the docking shaft drives the spring plates to rotate in reverse, its elasticity and direction will prevent it from driving the inner ratchet, keeping the fan blades stationary. In this way, external dust can be avoided during reverse measurement.

[0020] 4. The cleaning component is designed so that when the two retractable plates move inward, the inclined grooves on their outer sides will move backward synchronously to drive the internally inserted connecting shaft. In this way, the connecting shaft will move accordingly, driving the transmission arm connected at the outer end to move. The transmission arm can then satisfy the rotation of the second connecting arm through the movement of the connecting shaft, so that the second connecting arm pushes the first connecting arm through rotation. In this way, the first connecting arm will push the connecting strip, causing the brush plate that is limited to the bottom of the guide shell to move out and abut against the ground. During the moving measurement process, the measuring position is brushed and cleaned, further enhancing its cleanliness. At the same time, the brushing dust can be discharged in conjunction with the positive rotation suction of the fan blades, reducing the probability of dust accumulation and dust adhesion to the detection end. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the combined structure of the protective cleaning device of the present invention;

[0023] Figure 3 This is a schematic diagram of the opening and closing component structure of the present invention;

[0024] Figure 4 It is a schematic diagram of the moving structure of the application;

[0025] Figure 5 It is a schematic diagram of the rear view part structure of the opening and closing assembly of the application;

[0026] Figure 6 It is a schematic diagram of the dust removal assembly structure of the application;

[0027] Figure 7 It is a schematic diagram of the disassembled structure of the dust removal assembly of the application;

[0028] Figure 8 It is a schematic diagram of the right view internal structure of the ratchet structure of the application;

[0029] Figure 9 It is a schematic diagram of the three-dimensional structure of the cleaning assembly of the application;

[0030] Figure 10 It is a schematic diagram of the three-dimensional structure of the push-pull assembly of the application.

[0031] In the figure: the main body of the width measuring instrument 1, the key 2, the cable 3, the measurement probe 4, the protective cleaning device 5, the connecting plate 51, the guide shell 52, the protective shell 53, the round hole 54, the contraction plate 55, the opening and closing assembly 56, the first shutter 561, the second shutter 562, the moving structure 563, the rack 5631, the gear 5632, the rotating shaft 5633, the driving wheel 5634, the belt 5635, the driven wheel 5636, the connecting frame 5637, the damper 564, the spring 565, the dust removal assembly 57, the roller 571, the pulley set 572, the ratchet structure 573, the fixed plate 5731, the butt joint shaft 5732, the spring sheet 5733, the inner ratchet 5734, the fan blade 574, the cleaning assembly 58, the brush plate 581, the limiting block 582, the push-pull assembly 583, the butt joint strip 5831, the first connecting arm 5832, the second connecting arm 5833, the transmission arm 5834, the connecting shaft 5835, the support strip 5836. DETAILED DESCRIPTION

[0032] In order to further explain the technical scheme of the application, the following specific embodiments are described in detail.

[0033] Please refer to Figure 1 The application provides a concrete crack width measuring instrument, which comprises a width measuring instrument main body 1, a key 2 is arranged at the right side of the front end of the width measuring instrument main body 1, a cable 3 is butt jointed to the top of the width measuring instrument main body 1, a measurement probe 4 is butt jointed to the end of the cable 3 away from the width measuring instrument main body 1, and a protective cleaning device 5 is arranged outside the measurement probe 4.

[0034] Specifically, when the concrete structure crack width measurement activity is to be carried out, the connection of the measurement probe 4 and the width gauge main body 1 can be realized through the cable 3, at this time, the operation of the width gauge main body 1 is realized through the key 2 arranged at the right side of the front end of the width gauge main body 1, when the measurement operation is set, the measurement probe 4 can be taken by the staff to approach the position to be measured, and the data of the concrete structure crack to be measured is obtained by moving the measurement probe 4, the data obtained can be transmitted by the cable 3, and displayed by the width gauge main body 1, so that the width measurement activity of the concrete structure crack can be quickly realized.

[0035] Please refer to Figure 2 The protective cleaning device 5 in the embodiment includes a connecting plate 51 which is transversely butted to the outside of the measurement probe 4, the left and right sides of the front end of the connecting plate 51 are fixedly connected with guide housings 52, and a protective shell 53 is transversely installed between the two guide housings 52, the rear side of the middle of the protective shell 53 is connected with the front side of the measurement probe 4, a round hole 54 is arranged in the front side of the middle of the protective shell 53, and the round hole 54 is arranged at a position opposite to the front end of the measurement probe 4, a contraction plate 55 is longitudinally and limitingly and slidingly connected with the front side of the protective shell 53, the side edge of the contraction plate 55 is connected with an opening and closing assembly 56 which is installed in the protective shell 53, a dust removal assembly 57 is installed in the front side of the inside of the contraction plate 55, and a cleaning assembly 58 is arranged at the lower end of the protective shell 53 and connected with the side edges of the protective shell 53 and the contraction plate 55.

[0036] An inclined groove is arranged in the outside of the contraction plate 55, and the contraction plate 55 is connected with the connecting shaft 5835 through the inclined groove, that is, when the contraction plate 55 is pressed and moved inward, the cleaning assembly 58 can be operated in linkage with the inclined groove arranged in the side edge.

[0037] Please refer to Figures 3-5 The opening and closing assembly 56 in the embodiment includes a first shutter 561 which is transversely and limitingly and slidingly installed in the inside of the protective shell 53, the right side of the first shutter 561 is abutted with a second shutter 562 which is installed in the same way as the first shutter 561, that is, both are transversely and limitingly and slidingly installed in the inside of the protective shell 53, the rear side of the first shutter 561 and the rear side of the second shutter 562 are both connected with a moving structure 563, a damper 564 is longitudinally and insertingly arranged at the rear side of the inside of the contraction plate 55, the rear side of both sides of the damper 564 is connected with the connecting plate 51, and the front end of the outside of both sides of the damper 564 is installed with a spring 565.

[0038] The moving structure 563 comprises a rack 5631 longitudinally embedded in the contraction plate 55 inside the side close to the protective shell 53, and the outer side of the rack 5631 is in meshing connection with a gear 5632 installed inside the left and right sides of the protective shell 53, and the middle part of the gear 5632 is vertically connected with a rotating shaft 5633, the rotating shaft 5633 is rotationally connected with the left and right sides of the protective shell 53, the upper end of the rotating shaft 5633 is connected with a driving wheel 5634, the outer part of the driving wheel 5634 is in transmission connection with a belt 5635, the side away from the driving wheel 5634 of the belt 5635 is connected with a driven wheel 5636, the outer part of the belt 5635 is installed with a connecting frame 5637, and the front side of the connecting frame 5637 is fixedly connected with the first shutter 561 or the second shutter 562, that is, the connecting frame 5637 is locked with the outer end of the belt 5635 on one side, so that the belt 5635 can synchronously meet the left and right transverse reciprocating movement of the connecting frame 5637 when it is positively and reversely transmitted.

[0039] The first shutter 561 and the second shutter 562 are transversely limited and slidably installed inside the left and right sides of the protective shell 53, and the abutting position of the first shutter 561 and the second shutter 562 is longitudinally opposite to the circular hole 54, so that the abutting cooperation of the first shutter 561 and the second shutter 562 can meet the plugging protection of the front side of the measurement probe 4, and the probability of the occurrence of the measurement probe end wear problem is reduced.

[0040] Specifically, when the measurement of the measurement probe 4 is to be used, the measurement probe 4 can be abutted against the outside of the concrete structure, at this time, the contraction plate 55 abutted against the front end of the two side guide shells 52 will be simultaneously moved inward, so that the rack 5631 embedded in the inner side will be moved backward, so that the gear 5632 in meshing connection with the rack 5631 and installed inside the left and right sides of the protective shell 53 will cooperate with the rotating shaft 5633 connected with the middle part to realize the rotation of the driving wheel 5634 connected with the top of the rotating shaft 5633, under the linkage cooperation of the rotation of the driving wheel 5634 and the transmission connection of the belt 5635 outside the driving wheel 5634, the driven wheel 5636 connected with the other end of the belt 5635 can be synchronously rotated, thereby the belt 5635 can meet the transverse movement of the connecting frame 5637 locked with the outer end, and drive the first shutter 561 and the second shutter 562 abutted against the front side of the connecting frame 5637 to move transversely opposite to the inner side of the protective shell 53, so that the first shutter 561 and the second shutter 562 automatically release the closure of the circular hole 54 opened in the front side of the protective shell 53, and thus the measurement probe 4 can meet the measurement of the concrete structure cracks through the opened circular hole 54.

[0041] Secondly, when the two side contraction plates 55 are extruded and moved inward, the dampers 564 and springs 565 at the rear end can be compressed at the same time. Thus, when the measurement activity is completed and the extrusion of the measurement probe 4 is released, the two side contraction plates 55 can be automatically moved outward and reset in cooperation with the guidance of the outer end of the guide shell 52. Thus, the rack 5631, the gear 5632, the shaft 5633, the driving wheel 5634, the belt 5635, the driven wheel 5636, and the connecting frame 5637 can be sequentially linked to meet the horizontal relative transmission of the first shutter 561 and the second shutter 562, so that the first shutter 561 and the second shutter 562 are moved to abut against each other to close the round hole 54. Thus, it is ensured that the measurement probe 4 can be automatically closed for protection when it is not in use to avoid damage to the lens. At the same time, the front end of the measurement probe 4 extends into the protective shell 53, and the protective shell 53 can avoid wear of the measurement probe 4 during movement and detection by the wrapping protection effect.

[0042] Please refer to Figures 6-8 The dust removal assembly 57 in the embodiment includes a roller 571 rotatably connected to the middle part of the front side of the contraction plate 55. A belt pulley set 572 is connected to the side edge shaft end of the roller 571. The rear side of the belt pulley set 572 is connected with a ratchet structure 573, which is built into the front side of the contraction plate 55. The side away from the belt pulley set 572 of the ratchet structure 573 is connected with a fan blade 574.

[0043] The ratchet structure 573 includes a fixed plate 5731 vertically fixedly connected to the front side of the contraction plate 55. The middle part of the fixed plate 5731 is rotatably connected with a connecting shaft 5732. The outer side of the connecting shaft 5732 is connected with the belt pulley set 572. Spring sheets 5733 are equidistantly arranged on the inner side of the connecting shaft 5732. The spring sheets 5733 are embedded in the inner side of an inner ratchet 5734. The middle part of the other side of the fixed plate 5731 is rotatably connected with the inner ratchet 5734. The outer end of the fixed plate 5731 is connected with the fan blade 574. The connecting shaft 5732 and the inner ratchet 5734 are not fixedly connected, but are connected through the spring sheets 5733 arranged on the outer side of the connecting shaft 5732.

[0044] The spring sheets 5733 are equidistantly arranged on the outer side of one end of the connecting shaft 5732 in an arc-shaped strip shape. The spring sheets 5733 are embedded in the tooth groove end of the inner ratchet 5734. When the connecting shaft 5732 drives the spring sheets 5733 to rotate forward, the spring sheets 5733 can push the tooth groove end of the inner ratchet 5734 to drive the inner ratchet 5734 to rotate. When the connecting shaft 5732 drives the spring sheets 5733 to rotate backward, the spring sheets 5733 cannot push the inner ratchet 5734 to rotate, so that the fan blade 574 cannot rotate. Thus, the fan blade 574 rotates in one direction to adapt to the subsequent brushing and cleaning effect.

[0045] Specifically, when the two shrink plates 55 are squeezed and moved for measurement, the rollers 571 located at the middle of the front end of the two shrink plates 55 can enhance the smoothness of the moving measurement. At the same time, when the rollers 571 are pushed and rotated, they can satisfy the transmission of the pulley group 572 connected to one side of the shaft end, so that the pulley group 572 can satisfy the synchronous rotation of the docking shaft 5732 connected to one side of the fixed plate 5731. When the docking shaft 5732 rotates, the spring plates 5733 equidistantly located on the outside of one end will rotate synchronously and abut against the toothed end inside the inner ratchet 5734, so that the inner ratchet 5734 will rotate synchronously. In this way, the fan blades 574 connected to the outer end of the inner ratchet 5734 will rotate and generate a certain suction force, so that the dust attached to the concrete structure measurement surface is discharged through the suction effect, thereby stabilizing and maintaining the cleanliness of the concrete structure measurement surface and enhancing the accuracy of subsequent crack measurement.

[0046] When the reverse push is performed, the rollers 571 on both sides will rotate in opposite directions. In this way, the pulley assembly 572 will drive the docking shaft 5732 to reverse the rotation of the spring plates 5733 equidistantly arranged on the outside of the docking shaft 5732. Since each spring plate 5733 is elastic and each spring plate 5733 is arranged in an arc shape, when the docking shaft 5732 reverses, each spring plate 5733 will not abut against the toothed end of the inner ratchet 5734, thus preventing the inner ratchet 5734 from rotating. In this way, when the inner ratchet 5734 performs the reverse push measurement, it will not drive the outer end of the fan blade 574 to rotate, thus preventing the fan blade 574 from bringing external dust into the measurement position when it reverses, which would affect the accuracy of the crack measurement.

[0047] Please see Figures 9-10 In this embodiment, the cleaning component 58 includes a brush plate 581, which is located at the lower end of the protective shell 53. Limiting blocks 582 are fixedly connected to both sides of the top of the fixing plate 5731. The limiting blocks 582 are embedded inside the lower end of the guide shell 52. Thus, the sliding state of the brush plate 581 can be satisfied by the mating cooperation of the limiting blocks 582 on both sides. The left and right sides of the brush plate 581 are connected to the push-pull component 583, and the push-pull component 583 is installed on the side of the guide shell 52.

[0048] The push-pull assembly 583 includes a connecting strip 5831, which is located on the side of the guide shell 52. The lower end of the connecting strip 5831 is bolted to the brush plate 581. The upper side of the connecting strip 5831 is rotatably connected to a first connecting arm 5832. The rear side of the first connecting arm 5832 is rotatably connected to a second connecting arm 5833. The front side of the second connecting arm 5833 is inclinedly inserted with a transmission arm 5834. The front side of the transmission arm 5834 is laterally equipped with a connecting shaft 5835. The end of the connecting shaft 5835 away from the transmission arm 5834 is inserted into an inclined groove on the outside of the shrink plate 55. The front side of the second connecting arm 5833 is rotatably connected to a support strip 5836. The rear side of the support strip 5836 is bolted to the connecting plate 51.

[0049] Specifically, when the two shrink plates 55 are squeezed inward, the inclined grooves on their exterior will move inward synchronously, and will be driven by the connecting shaft 5835 laterally connected to the front of the transmission arm 5834 through their inclined direction. This causes the connecting shaft 5835 to pull the transmission arm 5834 down through the backward movement of the inclined grooves and the downward movement of the inclined direction. Since the second connecting arm 5833 is rotatably connected to the front of the support bar 5836, the transmission arm 5834 can rotate the second connecting arm 5833 through the transmission effect, and satisfy the forward swing of the first connecting arm 5832 which is rotatably connected to the rear end. The swing of the first connecting arm 5832 can cause the connecting bar 5831 connected to the front of the first connecting arm 5832 to move. The forward movement, which connects to the brush plate 581 at the bottom of the connecting strip 5831, can move forward in conjunction with the limiting blocks 582 on both sides of its top and the limiting sliding effect of the guide shells 52 on both sides, allowing it to move to a position where it is in contact with the ground. In this way, when the measuring probe 4 is moving to perform measurement activities, the brush plate 581 in contact with the ground can brush and clean the measurement position, further cleaning the dust and enhancing the cleanliness of the measurement position. At the same time, the dust generated by brushing can be discharged outward by the positive rotation suction of the fan blade 574, thereby reducing the probability of dust accumulation or adhesion to the detection end of the measuring probe 4, and significantly enhancing the measurement effect of concrete structure cracks.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A concrete crack width measuring instrument, comprising a measuring instrument body (1), wherein a switch (2) is provided on the right side of the front end of the measuring instrument body (1), a cable (3) is connected to the top of the measuring instrument body (1), and a measuring probe (4) is connected to the end of the cable (3) away from the measuring instrument body (1). Its features are: It also includes a protective cleaning device (5) located outside the measuring probe (4). The protective cleaning device (5) includes a connecting plate (51). The connecting plate (51) is installed outside the measuring probe (4). The front sides of the connecting plate (51) are fixedly connected to guide shells (52), and a protective shell (53) is installed between the two guide shells (52). The rear middle of the protective shell (53) is connected to the front side of the measuring probe (4), and a round hole (54) is opened in the front middle of the protective shell (53). The front side of the guide shell (52) is limited and slidably connected to a shrink plate (55). The side of the shrink plate (55) is connected to an opening and closing component (56), and the opening and closing component (56) is installed inside the protective shell (53). A dust removal component (57) is installed inside the front side of the shrink plate (55). A cleaning component (58) is provided at the lower end of the protective shell (53), and the cleaning component (58) is connected to the protective shell (53) and the side of the shrink plate (55). The cleaning component (58) includes a brush plate (581), which is located at the lower end of the protective shell (53). Limiting blocks (582) are fixedly connected to the top and rear sides of the fixing plate (5731). The limiting blocks (582) are embedded inside the lower end of the guide shell (52). The left and right sides of the brush plate (581) are connected to the push-pull component (583), and the push-pull component (583) is installed on the side of the guide shell (52). The push-pull assembly (583) includes a docking strip (5831), which is located on the side of the guide shell (52). The lower end of the docking strip (5831) is connected to the brush plate (581). The upper side of the docking strip (5831) is rotatably connected to a first connecting arm (5832). The rear side of the first connecting arm (5832) is rotatably connected to a second connecting arm (5833). The front side of the second connecting arm (5833) is connected to a transmission arm (5834). The front side of the transmission arm (5834) is equipped with a connecting shaft (5835), and the side of the connecting shaft (5835) is inserted into the shrink plate (55). The front end of the second connecting arm (5833) is rotatably connected to a support strip (5836), and the rear side of the support strip (5836) is bolted to the connecting plate (51).

2. The concrete crack width measuring instrument according to claim 1, characterized in that: The opening and closing assembly (56) includes a first stop (561), which is slidably installed inside the protective shell (53), and a second stop (562) abuts against the right side of the first stop (561). The rear sides of the first stop (561) and the second stop (562) are connected to a movable structure (563). A damper (564) is inserted into the rear side of the retraction plate (55), and the rear side of the damper (564) is connected to the connecting plate (51). A spring (565) is installed on the outer side of the front end of the damper (564).

3. The concrete crack width measuring instrument according to claim 2, characterized in that: The movable structure (563) includes a rack (5631), which is embedded inside one side of the shrink plate (55), and the outside of the rack (5631) is meshed with a gear (5632). The gear (5632) is installed inside the left and right sides of the protective shell (53), and a rotating shaft (5633) is vertically connected to the middle of the gear (5632). The upper end of the rotating shaft (5633) is connected to a drive wheel (5634). A belt (5635) is connected to the outside of the drive wheel (5634). The side of the belt (5635) away from the drive wheel (5634) is connected to the driven wheel (5636). A connecting frame (5637) is installed outside the belt (5635), and the front side of the connecting frame (5637) is fixedly connected to the first stop (561) or the second stop (562).

4. The concrete crack width measuring instrument according to claim 1, characterized in that: The dust removal assembly (57) includes a roller (571) which is rotatably connected to the front side of the shrink plate (55). A pulley assembly (572) is connected to the side of the roller (571). The rear side of the pulley assembly (572) is connected to a ratchet structure (573), which is built into the front side of the shrink plate (55). The side of the ratchet structure (573) away from the pulley assembly (572) is connected to the fan blade (574).

5. The concrete crack width measuring instrument according to claim 4, characterized in that: The ratchet structure (573) includes a fixed plate (5731), which is fixedly connected to the inside of the front side of the retractable plate (55). A docking shaft (5732) is rotatably connected to one side of the middle part of the fixed plate (5731). The outer side of the docking shaft (5732) is connected to the pulley group (572), and spring plates (5733) are provided at equal intervals on the outer end of the inner side of the docking shaft (5732). The spring plates (5733) are embedded in the inner side of the inner ratchet (5734), and the inner ratchet (5734) is rotatably connected to the other side of the middle part of the fixed plate (5731). The outer end of the fixed plate (5731) is connected to the fan blade (574).

6. The concrete crack width measuring instrument according to claim 1, characterized in that: The shrink plate (55) has an inclined groove on its outer side, and the shrink plate (55) is connected to the connecting shaft (5835) through the inclined groove.

7. The concrete crack width measuring instrument according to claim 2, characterized in that: The first barrier (561) and the second barrier (562) are laterally limited and slidably installed on the left and right sides inside the protective shell (53), and the positions where the first barrier (561) and the second barrier (562) abut against each other are longitudinally opposite to the round hole (54).

8. A concrete crack width measuring instrument according to claim 5, characterized in that: The spring sheet (5733) is an arc-shaped strip that is equidistantly installed on the outer side of one end of the docking shaft (5732), and the spring sheet (5733) on each side is embedded in the tooth groove end of the inner ratchet (5734).

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