Engineering crack monitoring device

Abstract

An engineering crack monitoring device disclosed by the present invention comprises a crack contact unit, a multi-stage mechanical amplification system, an accumulative recording module and an alarm unit, and the crack contact unit can be inserted into a crack and is used for contacting two sides of the crack and sensing the width change of the crack; the multi-stage mechanical amplification system is connected with the crack contact unit and is used for performing multi-stage amplification on the crack width change induced by the crack contact unit; the accumulative recording module is connected with the multi-stage mechanical amplification system and is used for converting a width change signal output by the multi-stage mechanical amplification system into an accumulative displacement record; the alarm unit is connected with the accumulative recording module and used for triggering mechanical alarm when the accumulative crack width exceeds a preset threshold value. According to the engineering crack monitoring device, the crack change condition can be monitored with high precision.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering structure health monitoring, and specifically to an engineering crack monitoring device. Background Art

[0002] In engineering structural health monitoring, cracks are an important indicator for assessing structural safety. Traditional crack monitoring methods rely primarily on electronic sensors (such as fiber optic sensors and strain gauges) or manual inspections, which present the following problems:

[0003] 1. High dependence on electronic sensors: Existing technologies mostly use electronic or electrical components, which are susceptible to electromagnetic interference and temperature changes, and require external power supply, resulting in low reliability in harsh environments;

[0004] 2. Low efficiency of manual inspection: The accuracy of manual measurement is affected by subjective factors and continuous monitoring cannot be achieved;

[0005] 3. Mechanical devices have a single function: Existing mechanical crack monitoring devices mostly use a single lever or gear amplification, and the measurement accuracy is low. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the technical problem to be solved by the present invention is to provide an engineering crack monitoring device that can monitor crack changes with high precision without relying on electronic technology.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solution: an engineering crack monitoring device, comprising:

[0008] A crack contact unit can be inserted into the crack to contact both sides of the crack and sense changes in crack width;

[0009] a multi-stage mechanical amplification system connected to the crack contact unit and configured to amplify the crack width change sensed by the crack contact unit in multiple stages;

[0010] a cumulative recording module connected to the multi-stage mechanical amplification system, and configured to convert the width change signal output by the multi-stage mechanical amplification system into a cumulative displacement record; and

[0011] An alarm unit is connected to the cumulative recording module and is used to trigger a mechanical alarm when the cumulative crack width exceeds a preset threshold.

[0012] Furthermore, the crack contact unit includes:

[0013] Mounting rod;

[0014] There are two wedge-shaped probes, which are symmetrically and slidably arranged on the mounting rod, and can be embedded in both sides of the crack;

[0015] an elastic reset mechanism, disposed between the two wedge-shaped probes, for driving the wedge-shaped probes to move away from each other to maintain close contact with the crack sidewalls; and

[0016] A differential linkage mechanism is connected to the tails of the two wedge-shaped probes and is used to convert the bidirectional displacement of the wedge-shaped probes into a unidirectional displacement and output the displacement to the multi-stage mechanical amplification system.

[0017] Furthermore, the differential linkage mechanism includes a first link and a second link cross-hinged, the input ends of the first link and the second link are respectively connected to the two wedge-shaped probes, and the output ends of the first link and the second link jointly drive a multi-stage mechanical amplification system.

[0018] Furthermore, the multi-stage mechanical amplification system includes:

[0019] a first-stage amplification mechanism, comprising a lever, wherein the lever is connected in the extending direction of the first connecting rod, and the length of the lever is greater than the length of the first connecting rod;

[0020] A secondary amplification mechanism includes a worm gear mechanism, wherein the number of teeth of the worm wheel of the worm gear mechanism is a multiple of the number of threads of the worm;

[0021] A connecting structure comprising a rocker arm, a push rod, a toggle rod, a baffle and a linkage gear, wherein one end of the rocker arm is hinged to the lever, and the other end is hinged to the push rod, the push rod is arranged horizontally, and the lever can drive the push rod to move horizontally, there are multiple toggle rods, and the multiple toggle rods are evenly spaced and hinged to the push rod through torsion springs, the baffle is arranged in a one-to-one correspondence with the toggle rods and is fixed to the push rod, and is in contact with the toggle rod near the rocker arm, and the linkage gear is sleeved and fixed on the rotating shaft of the worm;

[0022] The three-stage amplification mechanism includes a sector gear coaxially arranged with the worm gear and a spur gear meshing with the sector gear. The number of teeth of the spur gear is multiple times the number of teeth of the sector gear. The cumulative recording module is connected to the spur gear and is used to drive the cumulative recording module to perform cumulative recording.

[0023] Furthermore, the cumulative recording module includes a scratch pen arranged on the gear shaft of the spur gear and a wax paper recording tape driven by a spring arranged below the scratch pen. The scratch pen is pressed against the surface of the wax paper recording tape by a coil spring, and the movement direction of the wax paper recording tape is opposite to the rotation direction of the spur gear.

[0024] Furthermore, the alarm unit includes a distance accumulation mechanism and an alarm. The distance accumulation mechanism is linked to the gear shaft and is used to convert the rotation angle of the gear shaft into linear displacement accumulation. When the accumulated displacement reaches a preset threshold, the alarm is triggered.

[0025] Furthermore, the distance accumulation mechanism includes bar teeth, which are engaged with the spur gear. The spur gear can drive the bar teeth to move linearly. The alarm is arranged on the moving route of the bar teeth. When the bar teeth move to a specified linear distance, they can contact the alarm to trigger the alarm to sound an alarm.

[0026] Furthermore, it also includes a shell, which is arranged outside the crack contact unit, the multi-stage mechanical amplification system, the cumulative recording module and the alarm unit; the bottom end of the shell is provided with double through holes, and the crack contact unit passes through the shell through the double through holes.

[0027] Furthermore, the alarm includes a slider with a warning color painted on the outer wall. The slider can be slidably arranged in the outer shell and is located in the direction of advancement of the bar teeth. The side wall of the outer shell is provided with a through hole connected to its inner cavity. When the bar teeth move to a preset position, the front end of the slider can be pushed out of the outer shell.

[0028] Furthermore, the wedge-shaped probe is made of Invar, and the probe surface is provided with anti-slip grooves.

[0029] Beneficial effects of the present invention:

[0030] To use the aforementioned engineering crack monitoring device, first install it and insert the crack contact unit into the crack. During use, the crack contact unit contacts both sides of the crack and senses changes in crack width. This width change is transmitted to the multi-stage mechanical amplification system, which amplifies the crack width change in multiple stages. The cumulative recording module converts the width change signal output by the multi-stage mechanical amplification system into a cumulative displacement record. Monitoring personnel only need to read the recorded cumulative information, and a mechanical alarm is triggered when the cumulative change reaches a preset threshold.

[0031] The use of the engineering crack monitoring device does not require manual inspections, does not use electronic sensors, is not easily affected by electromagnetic interference and temperature changes, and helps to improve reliability; in addition, through multi-stage amplification and accumulation functions, the measurement accuracy is improved to a certain extent, thereby further improving the safety of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the specific embodiments. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0033] Figure 1 A schematic diagram of an engineering crack monitoring device provided by one embodiment of the present invention;

[0034] Figure 2 for Figure 1 A schematic diagram of an engineering crack monitoring device in which an alarm is pushed out of a housing is shown;

[0035] Figure 3 for Figure 1 A partial schematic diagram of the middle part;

[0036] Figure 4 for Figure 1 A schematic diagram of scratches on a wax paper recording tape in an engineering crack monitoring device shown;

[0037] Reference numerals:

[0038] 100. Crack contact unit; 110. Mounting rod; 120. Wedge probe; 130. Elastic reset mechanism; 140. Differential linkage mechanism; 141. First link; 142. Second link; 200. Multi-stage mechanical amplification system; 210. Primary amplification mechanism; 220. Secondary amplification mechanism; 221. Worm gear; 222. Worm; 230. Connecting structure; 231. Rocker; 232. Push rod; 233. Toggle lever; 234. Baffle; 235. Linkage gear; 240. Third-stage amplification mechanism; 241. Fan gear; 242. Spur gear; 300. Accumulation recording module; 310. Scratch pen; 320. Wax paper recording tape; 400. Alarm unit; 410. Distance accumulation mechanism; 420. Alarm. DETAILED DESCRIPTION

[0039] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0040] See Figures 1 to 4 The present invention provides an engineering crack monitoring device, including a crack contact unit 100, a multi-stage mechanical amplification system 200, a cumulative recording module 300 and an alarm unit 400.

[0041] Specifically, the crack contact unit 100 can be inserted into a crack, contacting both sides of the crack and sensing changes in crack width. A multi-stage mechanical amplification system 200 is connected to the crack contact unit 100 and amplifies the crack width changes sensed by the crack contact unit 100. A cumulative recording module 300 is connected to the multi-stage mechanical amplification system 200 and converts the width change signal output by the multi-stage mechanical amplification system 200 into a cumulative displacement record. An alarm unit 400 is connected to the cumulative recording module 300 and triggers a mechanical alarm when the cumulative crack width exceeds a preset threshold.

[0042] To use the device, first install the crack monitoring device, inserting the crack contact unit 100 into the crack. During operation, the crack contact unit 100 contacts both sides of the crack, sensing changes in crack width. This information is then transmitted to the multi-stage mechanical amplification system 200, which amplifies the crack width changes in multiple stages. The cumulative recording module 300 converts the width change signals output by the multi-stage mechanical amplification system 200 into cumulative displacement records. Monitoring personnel simply read the recorded cumulative information, and a mechanical alarm is triggered when the cumulative change reaches a preset threshold.

[0043] The use of the engineering crack monitoring device does not require manual inspections, does not use electronic sensors, is not easily affected by electromagnetic interference and temperature changes, and helps to improve reliability; in addition, through multi-stage amplification and accumulation functions, the measurement accuracy is improved to a certain extent, thereby further improving the safety of the project.

[0044] In this embodiment, the crack contact unit 100 includes a mounting rod 110, an elastic reset mechanism 130, and a differential linkage mechanism 140. Two wedge probes 120 are symmetrically and slidably mounted on the mounting rod 110, capable of being inserted into either side of a crack. The elastic reset mechanism 130 is positioned between the two wedge probes 120, driving the wedge probes 120 in opposite directions to maintain close contact with the crack sidewalls. The differential linkage mechanism 140 is connected to the rear ends of the two wedge probes 120, converting the bidirectional displacement of the wedge probes 120 into a unidirectional output for the multi-stage mechanical amplification system 200.

[0045] During use, after the two wedge probes 120 are inserted into the crack, they are tightly attached to the crack sidewalls under the action of the elastic reset mechanism 130. During the crack change process, the differential linkage mechanism 140 converts the bidirectional displacement of the wedge probes 120 into a unidirectional output to the multi-stage mechanical amplification system 200.

[0046] Specifically, the differential linkage mechanism 140 includes a first link 141 and a second link 142 that are cross-hinged. The input ends of the first link 141 and the second link 142 are respectively connected to two wedge probes 120 , and the output ends of the first link 141 and the second link 142 jointly drive the multi-stage mechanical amplification system 200 .

[0047] In this embodiment, the multi-stage mechanical amplification system 200 includes a primary amplification mechanism 210 , a secondary amplification mechanism 220 , a connection structure 230 and a tertiary amplification mechanism 240 .

[0048] Specifically, the primary amplification mechanism 210 includes a lever connected in the extension direction of the first connecting rod 141, and the length of the lever is greater than the length of the first connecting rod 141. The secondary amplification mechanism 220 includes a worm gear mechanism. The number of teeth of the worm wheel 221 of the worm gear mechanism is a multiple of the number of threads of the worm 222. Through the worm wheel 221 and the worm 222, reverse self-locking can be achieved to ensure that the displacement is irreversible.

[0049] The connecting structure 230 includes a rocker rod 231, a push rod 232, a toggle rod 233, a baffle 234 and a linkage gear 235. One end of the rocker rod 231 is hinged to the lever, and the other end is hinged to the push rod 232. The push rod 232 is arranged horizontally, and the lever can drive the push rod 232 to move horizontally. There are multiple toggle rods 233, and the multiple toggle rods 233 are hinged to the push rod 232 at even intervals through torsion springs. The baffle 234 is arranged in a one-to-one correspondence with the toggle rod 233 and is fixed on the push rod 232, and is close to the toggle rod 233 near the rocker rod 231. The linkage gear 235 is sleeved and fixed on the rotating shaft of the worm 222.

[0050] The three-stage amplification mechanism 240 includes a sector gear 241 coaxially arranged with the worm gear 221 and a spur gear 242 meshing with the sector gear 241. The number of teeth of the spur gear 242 is a multiple of the number of teeth of the sector gear 241. The cumulative recording module 300 is connected to the spur gear 242 and is used to drive the cumulative recording module 300 to perform cumulative recording.

[0051] In a specific implementation, for example, the differential linkage 140 amplifies the initial crack displacement by 2 times, the lever mechanism amplification ratio is set to 1:5, and the worm gear mechanism amplification ratio is set to 1:30. The amplification ratio between the sector gear 241 and the spur gear 242 is set to 1:10. Ultimately, the displacement can be amplified 300 times, facilitating displacement amplification and converting micron-level crack changes into visible millimeter- or centimeter-level displacements.

[0052] In this embodiment, the cumulative recording module 300 includes a streak pen 310 mounted on the gear shaft of the spur gear 242 and a spring-driven wax paper recording tape 320 located below the streak pen 310. In practice, the spring drives the wax paper recording tape 320 to move at a constant speed (1 cm / day, with a recording period of ≥30 days). The streak pen 310 is pressed against the surface of the wax paper recording tape 320 by a coil spring, and the movement of the wax paper recording tape 320 is opposite to the rotation direction of the spur gear 242. During operation, each rotation of the spur gear 242 records one side of the wax paper recording tape 320. After the recording period is complete, the wax paper recording tape 320 can be observed to understand the crack changes.

[0053] In this embodiment, the alarm unit 400 includes a distance accumulation mechanism 410 and a mechanical alarm 420. The distance accumulation mechanism 410 is linked to the gear shaft and is used to convert the gear shaft's rotation angle into a linear displacement. When the accumulated displacement reaches a preset threshold, the mechanical alarm 420 is triggered. The mechanical alarm 420 can be a bell or a warning flag. When the warning flag is in a vertical position, the displacement has reached the preset threshold.

[0054] Specifically, the distance accumulation mechanism 410 includes bar teeth, which are engaged with the spur gear 242. The spur gear 242 can drive the bar teeth to move linearly. The alarm is set on the moving route of the bar teeth. When the bar teeth move to a specified linear distance, they can contact the alarm 420, thereby triggering the alarm 420 to sound an alarm.

[0055] As a preferred embodiment, the device may further include a housing, which may play a certain protective role.

[0056] Specifically, the outer shell is arranged outside the crack contact unit 100, the multi-stage mechanical amplification system 200, the cumulative recording module 300 and the alarm unit 400; the bottom end of the outer shell is provided with double through holes, and the crack contact unit 100 passes through the double through holes.

[0057] In addition, in a specific implementation, the wedge-shaped probe 120 can be made of Invar steel, with a wedge angle of 15°, and the probe surface is provided with anti-slip grooves with a depth of 0.1-0.3 mm.

[0058] As another preferred embodiment, the mechanical alarm 420 includes a slider with a warning color painted on the outer wall. The slider can be slidably arranged in the outer shell and is located in the direction of advancement of the bar teeth. The side wall of the outer shell is provided with a through hole connected to its inner cavity. When the bar teeth move to a preset position, the front end of the slider can be pushed out of the outer shell.

[0059] During use, when the crack increases to a preset width, the slider will be pushed out. When the slider is found to be pushed out, it indicates that the safety threshold has been exceeded.

[0060] The above-mentioned engineering crack monitoring device:

[0061] The crack monitoring device for the project eliminates the need for manual inspections and uses no electronic sensors. It is less susceptible to electromagnetic interference and temperature fluctuations, thus improving reliability. Furthermore, the multi-stage amplification and accumulation functions of the differential linkage 140, lever mechanism 210, worm gear mechanism, and sector gear mechanism enhance measurement accuracy to a certain extent, further improving project safety. The cumulative recording module 300 records changes in the cracks, and the distance accumulation mechanism 410 and alarm unit 400 generate an alarm when safety thresholds are exceeded, prompting the monitor to take appropriate measures to ensure project safety.

[0062] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. An engineering crack monitoring device, characterized in that: include: A crack contact unit can be inserted into the crack to contact both sides of the crack and sense changes in crack width; a multi-stage mechanical amplification system connected to the crack contact unit and configured to amplify the crack width change sensed by the crack contact unit in multiple stages; a cumulative recording module connected to the multi-stage mechanical amplification system, and configured to convert the width change signal output by the multi-stage mechanical amplification system into a cumulative displacement record; and An alarm unit is connected to the cumulative recording module and is used to trigger a mechanical alarm when the cumulative crack width exceeds a preset threshold.

2. The engineering crack monitoring device according to claim 1, characterized in that: The crack contact unit includes: Mounting rod; There are two wedge-shaped probes, which are symmetrically and slidably arranged on the mounting rod, and can be embedded in both sides of the crack; an elastic reset mechanism, disposed between the two wedge-shaped probes, for driving the wedge-shaped probes to move away from each other to maintain close contact with the crack sidewalls; and A differential linkage mechanism is connected to the tails of the two wedge-shaped probes and is used to convert the bidirectional displacement of the wedge-shaped probes into a unidirectional displacement and output the displacement to the multi-stage mechanical amplification system.

3. The engineering crack monitoring device according to claim 2, characterized in that: The differential linkage mechanism includes a first link and a second link that are cross-hinged, the input ends of the first link and the second link are respectively connected to the two wedge-shaped probes, and the output ends of the first link and the second link jointly drive a multi-stage mechanical amplification system.

4. The engineering crack monitoring device according to claim 3, characterized in that: The multi-stage mechanical amplification system comprises: a first-stage amplification mechanism, comprising a lever, wherein the lever is connected in the extending direction of the first connecting rod, and the length of the lever is greater than the length of the first connecting rod; A secondary amplification mechanism includes a worm gear mechanism, wherein the number of teeth of the worm wheel of the worm gear mechanism is a multiple of the number of threads of the worm; A connecting structure comprising a rocker arm, a push rod, a toggle rod, a baffle and a linkage gear, wherein one end of the rocker arm is hinged to the lever, and the other end is hinged to the push rod, the push rod is arranged horizontally, and the lever can drive the push rod to move horizontally, there are multiple toggle rods, and the multiple toggle rods are evenly spaced and hinged to the push rod through torsion springs, the baffle is arranged in a one-to-one correspondence with the toggle rods and is fixed to the push rod, and is in contact with the toggle rod near the rocker arm, and the linkage gear is sleeved and fixed on the rotating shaft of the worm; The three-stage amplification mechanism includes a sector gear coaxially arranged with the worm gear and a spur gear meshing with the sector gear. The number of teeth of the spur gear is multiple times the number of teeth of the sector gear. The cumulative recording module is connected to the spur gear and is used to drive the cumulative recording module to perform cumulative recording.

5. The engineering crack monitoring device according to claim 4, characterized in that: The cumulative recording module includes a scratch pen arranged on the gear shaft of the spur gear and a wax paper recording tape driven by a spring arranged below the scratch pen. The scratch pen is pressed against the surface of the wax paper recording tape by a coil spring, and the movement direction of the wax paper recording tape is opposite to the rotation direction of the spur gear.

6. The engineering crack monitoring device according to claim 5, characterized in that: The alarm unit includes a distance accumulation mechanism and an alarm. The distance accumulation mechanism is linked with the gear shaft to convert the rotation angle of the gear shaft into linear displacement accumulation. When the accumulated displacement reaches a preset threshold, the alarm is triggered.

7. The engineering crack monitoring device according to claim 6, characterized in that: The distance accumulation mechanism includes bar teeth, which are engaged with the spur gear. The spur gear can drive the bar teeth to move linearly. The alarm is arranged on the moving route of the bar teeth. When the bar teeth move to a specified linear distance, they can contact the alarm to trigger the alarm to sound an alarm.

8. The engineering crack monitoring device according to claim 7, characterized in that: It also includes a shell, which is arranged outside the crack contact unit, the multi-stage mechanical amplification system, the cumulative recording module and the alarm unit; the bottom end of the shell is provided with double through holes, and the crack contact unit passes through the shell through the double through holes.

9. The engineering crack monitoring device according to claim 7, characterized in that: The alarm includes a slider with a warning color painted on the outer wall. The slider can be slidably arranged in the outer shell and is located in the direction of advancement of the bar teeth. The side wall of the outer shell is provided with a through hole connected to its inner cavity. When the bar teeth move to a preset position, the front end of the slider can be pushed out of the outer shell.

10. The engineering crack monitoring device according to claim 1, characterized in that: The wedge-shaped probe is made of Invar steel, and the surface of the probe is provided with anti-slip grooves.

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