KR102330065B1 - System for inspecting crack of structure - Google Patents

Abstract

The present invention relates to a system for detecting cracks in structures such as piers and buildings. It includes a pair of driving units for elevating and at least one supporting unit provided at the rear end of the body and supported to be movable in the vertical direction along one surface of the structure.

Description

System for inspecting crack of structure

The present invention relates to a detection system, and more particularly, to a system for detecting cracks in structures such as piers and buildings.

In general, the pier constituting the lower structure of the bridge is responsible for firmly supporting the upper structure PC-BEAM or the upper plate slab from the bottom.

Especially in Korea, since there are many rivers, when a bridge is built across a river, the pier is often located in the water with a well foundation, or when a bridge is built in a mountainous area, the well foundation is buried in the ground. A pier is built on the top of the well foundation.

As vehicles pass on the upper part of these piers, vibration absorbing devices called elastic bearings, pedestals, and elastic plates that can absorb upper vibrations are installed in the upper copings of the piers to support the lower part of the upper slab and operate elastically. will do

However, in spite of the fact that the bridge is regularly inspected every year, the problem of cracks occurring in the piers due to aging over time cannot be avoided.

In addition, since most bridges are configured to support and support the mold of the unit member, which is the upper structure, by means of several piers, regular inspection and maintenance of the piers is essential for the stability of the bridge.

In order to inspect and repair these several piers, it is essential to install a bridge inspection facility that allows workers to approach the pier. There are several types of bridge inspection facilities provided so far, such as fixed and mobile types.

For example, in a fixed inspection facility that can be installed at a relatively low cost, for each of several piers, the upper end of the pier fixes a steel plate scaffold of a certain area around the side of the coping with dozens of support brackets. It is a configuration that forms an inspection path through which workers can move by installing safety rails.

However, this fixed inspection facility has the advantage of good operator activity because the inspection passage is always secured around the pier. It has the disadvantage of being unsightly and damaging the aesthetics of the city. In addition, although the installation cost is rather low, the material cost and construction cost are high as the support brackets, steel plate scaffolding, and safety rails are made of stainless or steel material. There is a problem.

In addition, in the case of a mobile inspection bogie, rails must be installed over the entire length of the bridge and the mobile bogie must be equipped with a self-propelled driving device, a driving power source, and a driving device. There is a problem in that there is a defect.

On the other hand, recently, without installing a separate inspection facility, piers are inspected whenever necessary using drones, high-magnification cameras, and aerial work vehicles. However, there is a problem in that it is difficult to inspect high piers (over 50m) in which the terrain is rough and high with such a pier inspection means and strong winds.

For example, in the case of a drone, it is difficult to fly in a section where GPS is not received, it is difficult to respond to changes in the surrounding environment, such as wind, depending on the skill level of the pilot, and there are problems such as a fall or a collision and lack of safety. In addition, in the case of a high magnification camera, there are problems in that the accuracy is lower than that of the visual proximity inspection, the inspection blind spot occurs due to the interference of obstacles such as terrain, and the inspection time is excessively required. In addition, there are problems in that it is difficult to inspect the high-altitude work vehicle when there is no pier with a height of 30 m or more or an access road, and there is a risk of safety accidents such as overturning.

The present invention has been devised to solve the above problems, and an object of the present invention is to provide a crack detection system capable of inspecting cracks while ascending and descending in the height direction of a structure such as a pier.

Another object of the present invention is to provide a crack detection robot that can be assembled and disassembled so that it is easy to carry.

Another object of the present invention is to provide a system capable of detecting cracks regardless of the height of the structure.

The above-described object of the present invention, the body of the bar (bar) shape; a pair of driving units respectively provided at both ends of the body and for lifting and lowering the body by pulling a rope by a driving motor installed on one side of the body; And it is provided at the rear end of the body, it can be achieved by providing a crack detection system including at least one support movably supported in the vertical direction along one surface of the structure.

According to an aspect of the present invention, the body may include a base portion having a rectangular cross-section, and a coupling portion protruding backward from the rear surface of the base portion and extending in the longitudinal direction of the base portion.

According to another feature of the present invention, the body may be formed by continuously coupling a plurality of unit bodies in the longitudinal direction by a coupling member.

According to another feature of the present invention, the coupling member includes at least one or more clamp members provided on one side of the coupling part to mutually couple a pair of adjacent unit bodies, and the other side of the coupling part facing the clamp member. It may include at least one QR lever provided.

According to another feature of the present invention, the body may further include at least one or more mounting mounts coupled to one side of the coupling part to protrude to the rear of the coupling part for mounting measurement equipment.

According to another feature of the present invention, the driving unit includes: a pulley housing provided at one end of the body and having a space formed therein; a driving pulley coupled to the driving shaft of the driving motor and installed in the space; A first driven pulley installed on the front upper side of the pulley to rotate in conjunction with the driving pulley, a second driven pulley installed to rotate in conjunction with the first driven pulley on an upper portion of the driving pulley, and the second driven pulley It may include a third driven pulley installed to rotate in conjunction with the second driven pulley on the rear upper side of the.

According to another feature of the present invention, the driving unit includes a fourth driven pulley installed symmetrically with the first driven pulley to rotate in conjunction with the driving pulley, and the fourth driven pulley to rotate in conjunction with the fourth driven pulley. It may further include a fifth driven pulley installed vertically symmetrically with the second driven pulley, and a sixth driven pulley installed vertically symmetrically with the third driven pulley to rotate in conjunction with the fifth driven pulley.

According to another feature of the present invention, the support portion includes a first support member having one end coupled to the rear end of the body and the other end extending to be inclined upward, and the first support member is spaced apart from the first support member by a predetermined distance to have one end of the rear end of the body It may include a second support member coupled to the other end extending downwardly, and a support roller rotatably coupled to the ends of the first support member and the second support member, respectively.

According to another feature of the present invention, the support portion may further include an inclination adjustment portion formed at one end of the first support member to adjust the inclination angle of the first support member with respect to the body.

According to another feature of the present invention, the inclination adjustment unit is coupled to the rear end of the body and includes an inclination adjustment bracket in which a plurality of locking grooves are formed along the rear edge of the body, and passes through the first support member to the locking groove. It may include a QR lever into which the locking pin is inserted.

The crack detection system according to the present invention is capable of inspecting cracks while ascending and descending in the height direction of a structure such as a pier.

In addition, the crack detection robot according to the present invention can be assembled and disassembled, and it is easy to carry and install.

In addition, the crack detection system according to the present invention can detect cracks regardless of the height of the structure.

1 and 2 are perspective views of a crack detection robot according to an embodiment of the present invention.
3 and 4 are exploded perspective views of a crack detection robot according to an embodiment of the present invention.
5 is a configuration diagram of a coupling member according to an embodiment of the present invention.
6 is an exploded perspective view of a driving unit according to an embodiment of the present invention;
7 is an exploded perspective view of a support according to an embodiment of the present invention.
8 is a state diagram of the use of a crack detection robot according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the embodiments described below are merely for explaining in detail enough that a person of ordinary skill in the art to which the present invention pertains can easily implement the invention, which limits the protection scope of the present invention. doesn't mean And in describing various embodiments of the present invention, the same reference numerals will be used for components having the same technical characteristics.

Example

1 is a front perspective view of a crack detection robot according to an embodiment of the present invention, and FIG. 2 is a rear perspective view of a crack detection robot according to an embodiment of the present invention. And FIG. 3 is an exploded perspective view of FIG. 1 , and FIG. 4 is an exploded perspective view of FIG. 2 .

A crack detection system according to an embodiment of the present invention includes a crack detection robot 100 .

The crack detection robot 100 according to an embodiment of the present invention ascends and descends along the surface of a structure 10 (see FIG. 8 ), such as a pier or a building, and detects a crack generated on the surface of the structure 10 . The body 200 of the crack detection robot 100 is equipped with measuring equipment such as a sensor or a camera 20 (refer to FIG. 8), and the information obtained therefrom is transmitted to an information processing device, such as the length, thickness and distribution of cracks, etc. It is processed and stored as information necessary for safety diagnosis, and safety diagnosis can be performed.

1 to 4, the crack detection robot 100 according to an embodiment of the present invention is provided with a bar-shaped body 200 and one at both ends of the body 200, respectively. It includes a pair of driving units 300 and at least one support unit 400 provided at the rear end of the body 200 and supported on the surface of the structure 10 .

The body 200 as a whole is made in the form of a cuboid block having a length longer than the width, a base portion 210 having a rectangular cross-section, and a coupling portion 220 formed to protrude from the rear surface of the base portion 210 toward the rear. include At this time, the coupling part 220 is formed to extend long in the longitudinal direction of the base part 210 , and the body 200 may be formed in an empty shape for weight reduction. As another example, a separate device such as a measuring device such as a sensor, a communication device, or a power supply device may be built in the body 200 , and these devices may be mounted on the outside of the body 200 , of course. am.

In addition, a mounting mount 230 for mounting measurement equipment such as a sensor or a camera 30 is coupled to the rear end of the body 200 . For example, as shown in the drawing, the front end of the mounting mount 230 is coupled to the rear surface of the base 210 under the coupling unit 220 and the rear end of the mounting mount 230 is projected to the rear of the coupling unit 220 . can At this time, at least one fastening hole 231 is formed in the upper surface of the mounting mount 230 for coupling the bracket for mounting the measurement equipment.

Meanwhile, according to an embodiment of the present invention, a plurality of unit bodies 201 are continuously coupled in the longitudinal direction by the coupling member 500 to form one body 200 .

In this case, the user can increase the convenience in carrying and storage by separating the long body 200 into a plurality of relatively short unit bodies 201 . In addition, since the operation of the coupling member 500 is simple, it is possible to easily assemble the body 200 by coupling a plurality of unit bodies 201 to each other in the field. In addition, the length of the body 200 can be freely adjusted by combining an appropriate number of unit bodies 201 according to the width of the structure 10 to be diagnosed.

In the present embodiment, an example of forming the body 200 of the crack detection robot 100 by sequentially combining three unit bodies 201 is shown, but this is only one embodiment of the present invention, and the unit body 201 The number of may be appropriately selected in consideration of the overall length and weight of the body 200 .

5 is a block diagram of a coupling member according to an embodiment of the present invention.

According to an embodiment of the present invention, a pair of unit bodies 201 adjacent in the longitudinal direction are coupled to each other by a coupling member 500 , in which case the coupling member 500 is formed on the upper and lower sides of the coupling part 220 . and a clamp member 600 and a QR lever (Quick Release Lever) 700 respectively mounted to face each other.

Here, in the case of the embodiment shown in the drawing, the clamp member 600 is mounted on the upper side of the coupling part 220 on the rear side of the body 200, and the QR lever is opposed to the clamp member 600 on the lower side of the coupling part 220 . (700) is installed. However, unlike this, the QR lever 700 may be mounted on the upper side of the coupling unit 220 and the clamp member 600 may be mounted below the coupling unit 220 , of course.

The clamp member 600 according to an embodiment of the present invention includes a locking bracket 610 coupled to an upper side of any one coupling part 220 among a pair of adjacent unit bodies 201, and the other coupling part. (220) includes a hanging bracket 620 coupled to the upper side, and a clamping lever 630 having one end hinge-coupled to one side of the hanging bracket 620 .

At this time, the locking bracket 610 is coupled to the upper side of the locking plate 611 coupled to the upper side of the coupling portion 220, and the locking plate 611, and has a locking groove 612 on the opposite edge of the hanging bracket 620. It includes a locking portion 613 is formed. The hanging bracket 620 is coupled to the hanging plate 621 adjacent to the engaging plate 611 and coupled to the upper surface of the coupling part 220, and the upper surface of the hanging plate 621, and the hinge coupling part 622 is vertical. It includes a hinge bracket 623 that is formed to protrude.

In addition, the clamping lever 630 is a 'U'-shaped member having an operation lever 631 having one end hinge-coupled to the hinge coupling part 622, and an open end and a closed end, and has open ends on both sides of the operation lever 631. It includes a locking member 632 that is hinged.

In this case, when a pair of adjacent unit bodies 201 are coupled, the closed end of the locking member 632 is caught in the locking groove 612 of the locking part 613, and is caught by the rotation of the operation lever 631. The bracket 610 and the hanging bracket 620 are pressed and supported in a direction in close contact with each other.

In addition, as shown in FIG. 5 , a pair of adjacent unit bodies 201 includes a pair of coupling pads 710 that are respectively coupled to one end of the coupling unit 220 to face each other, and a pair of The coupling pad 710 includes a coupling protrusion 711 and a coupling groove 712 formed along the periphery of the opposite surfaces, respectively. At this time, when the pair of unit bodies 201 are abutted to each other in the longitudinal direction, one coupling protrusion 711 of the pair of coupling pads 710 is inserted and coupled to the other coupling groove 712 .

An insertion groove 713 is formed to extend diagonally in the outer corner of the lower end of the coupling pad 710 , and the locking pin 701 of the QR lever 700 is inserted into the insertion groove 713 . At this time, the adjustment nut 702 and the lever nut 703 of the QR lever 700 are respectively supported on the outer surfaces of the pair of coupling pads 710 in contact with each other, and the lever 704 of the QR lever 700 is rotated. By this, the pair of bonding pads 710 are pressed and supported in a direction in which they are in close contact with each other.

6 is an exploded perspective view of a driving unit according to an embodiment of the present invention.

According to an embodiment of the present invention, a pair of driving units 300 are provided at both ends of the body 200, one each. The driving unit 300 serves to elevate the body 200 by pulling the rope 20 , and for this purpose, driving motors 310 are installed on both sides of the body 200 , respectively.

The driving unit 300 according to an embodiment of the present invention includes a driving motor 310 coupled to the upper side of the coupling unit 220 on the rear side of the body 200 by a motor bracket 311 , and one end outside of the body 200 . A pulley housing 320 installed in a space in which a space is formed therein, a driving pulley 330 coupled to the drive shaft of the driving motor 310 and installed in the space of the pulley housing 320, and a driving pulley 330 and It includes a plurality of driven pulleys installed in the pulley housing 320 to rotate in conjunction.

Here, the pulley housing 320 includes a first housing plate 321 and a second housing plate 322 spaced apart from each other by a predetermined distance. In this case, the second housing plate 322 is disposed adjacent to one end of the body 200 , and the first housing plate 321 is disposed outside the second housing plate 322 .

The first housing plate 321 and the second housing plate 322 have a shape corresponding to the shape in which the driving pulley 330 and the driven pulley are disposed so as to protect the driving pulley 330 and the driven pulley installed in the space. is formed with At the front end of the first housing plate 321, a front cover portion 321a is formed to protrude to protect the front of the space portion, while maintaining a gap between the first and second housing plates 321 and 322, and the second housing plate ( At the rear end of the 322 , an arc-shaped cutout 322a is formed for coupling the drive shaft of the drive motor 310 and the drive pulley 330 .

A plurality of driven pulleys are installed together with the driving pulley 330 in the space inside the pulley housing 320 , and the rope (or wire) 20 extends in the vertical direction past them.

A plurality of driven pulleys are installed to rotate in association with the driving pulley 330, for example, six driven pulleys may be vertically symmetrically disposed with respect to the driving pulley 330 as shown in the drawing.

More specifically, the drive pulley 330 is coupled to the drive shaft of the drive motor 310 , and the first driven pulley 341 is installed on the front upper side of the drive pulley 330 . In addition, the second driven pulley 342 is installed on the upper side of the driving pulley 330 , that is, on the rear upper side of the first driven pulley 341 , and the third driven pulley 343 on the rear upper side of the second driven pulley 342 . ) is installed.

A fourth driven pulley 344 is installed under the first driven pulley 341 , and a fifth driven pulley 345 is installed below the driving pulley 330 , that is, at the rear lower side of the fourth driven pulley 344 . do. In addition, a sixth driven pulley 346 is installed on the lower rear side of the fifth driven pulley 345 . At this time, the fourth to sixth driven pulleys 344 to 346 are disposed vertically symmetrically with the first to third driven pulleys 341 to 343 with respect to the driving pulley 330 , respectively.

The rope 20 extends through the pulley housing 320 in the vertical direction. Hereinafter, the path of the rope 20 will be described in detail from the viewpoint that the rope 20 penetrates from the upper side to the lower side of the pulley housing 320 . do it with

The rope 20 entered between the second driven pulley 342 and the third driven pulley 343 extends above the front end of the first driven pulley 341 along the circumference of the lower end of the second driven pulley 342 . Then, the rope 20 wound around the front end of the first driven pulley 341 is extended to the upper side of the driving pulley 330, and is wound around the rear end of the driving pulley 330 of the fourth driven pulley 344. It extends above the front end. Afterwards, the rope wound around the front end of the fourth driven pulley 344 extends to the upper side of the rear end of the fifth driven pulley 345 , and then passes between the fifth driven pulley 345 and the sixth driven pulley 346 . Thus, it extends downward in the direction of the ground.

Accordingly, when the driving pulley 330 is rotated according to the driving motor 310 driving, the first to sixth driven pulleys 341 to 346 connected to the driving pulley 330 by the rope 20 are interlocked and rotated. , as the traction direction of the rope 20 is switched according to the rotation direction of the driving pulley 330 , the lifting operation of the body 200 is made.

On the other hand, in the rear of the second driven pulley 342, the second driven pulley 342 and the third driven pulley 343 by supporting the rope 20 in the direction of the second driven pulley 342 by supporting the rope 20 At least one or more first rollers 351 for guiding the path are rotatably installed. For example, as shown in the drawing, a pair of first rollers 351 at the rear of the lower end of the second driven pulley 342 may be arranged at an angle to be spaced apart from each other by a predetermined distance up and down. At this time, the rope 20 supported in the direction of the second driven pulley 342 by the first roller 351 is along the periphery of the lower end of the second driven pulley 342 to the upper side of the front end of the first driven pulley 341 . is extended

In addition, on the upper side of the driving pulley 330, by supporting the rope 20 wound around the driving pulley 330 via the second driven pulley 342 in the driving pulley 330 direction to guide the path of the rope 20. The second roller 352 is rotatably installed. For example, as shown in the drawing, the second roller 352 may be installed at the rear of the upper end of the first driven pulley 341 , and in this case, the second roller 352 has one end hinged on the upper side of the driving pulley 330 . It may be provided at the other end of the coupled first hinge lever 352a. The rope 20 supported by the second roller 352 is wound around the rear end of the driving pulley 330 .

In addition, a third roller 353 is installed vertically symmetrically with the second roller 352 under the driving pulley 330 . The third roller 353 guides the path of the rope 20 by supporting the rope 20 wound on the front end of the fourth driven pulley 344 through the driving pulley 330 in the driving pulley 330 direction. . For example, as shown in the drawing, the third roller 353 may be installed at the rear of the lower end of the fourth driven pulley 344 , and in this case, the third roller 353 has one end hinged at the lower side of the driving pulley 330 . It may be provided at the other end of the coupled second hinge lever 353a.

In addition, at least one or more fourth rollers 354 are rotatably installed at the rear of the fifth driven pulley 345 , and the rope 20 that goes out between the fifth driven pulley 345 and the sixth driven pulley 346 . The fifth driven pulley 345 is supported in the direction. For example, as shown in the drawing, a pair of fourth rollers 354 may be arranged at an angle at the rear of the upper end of the fifth driven pulley 345 by being spaced apart from each other by a predetermined interval in the vertical direction.

7 is an exploded perspective view of a support according to an embodiment of the present invention.

At least one support part 400 is provided at the rear end of the body 200 . For example, a plurality of support parts 400 may be provided to be spaced apart from each other at predetermined intervals along the length direction of the body 200 . The support part 400 prevents the body 200 from directly colliding with the structure 10 when the body 200 is raised and lowered, and is supported movably in the vertical direction along one surface of the structure 10 so that the body 200 is attached to the body 200 . It serves to reduce the transmitted shock or vibration. In addition, it also serves to adjust the distance between the measurement equipment mounted on the mounting mount 230 and the structure 10 as needed, which is the inclination of the first support member 410 and the second support member 420 to be described later. This can be done by adjusting the angle.

The support part 400 according to an embodiment of the present invention includes a first support member 410 and a second support member 420 that are obliquely coupled to the rear end of the body 200 in an alternating vertical direction, the first Support rollers 411 and 421 are rotatably coupled to the ends of the support member 410 and the second support member 420 , respectively.

For example, the first support member 410 and the second support member 420 may be formed of a 'C'-shaped cross-section frame, and the first support member 410 extends upwardly inclined to the rear of the body 200, The second support member 420 may extend downwardly inclined to the rear of the body 200 .

The first support member 410 and the second support member 420 can adjust the inclination angle with respect to the body 200 as needed, and for this purpose, the first support member 410 and the second support member 420 are One end of the inclination control unit 430 is formed, respectively.

Here, the inclination adjustment unit 430 includes a tilt adjustment bracket 440 coupled to the rear surface of the coupling unit 220 at the rear end of the body 200 and the first and second support members 410 and 420 to the inclination adjustment bracket 440 . Includes a QR lever 450 for fixing.

The inclination adjustment bracket 440 includes a bottom plate 441 coupled to the rear surface of the coupling unit 220 , and a pair of sidewalls 442 vertically protruding from both sides in the width direction of the bottom plate 441 . One end of the first and second support members 410 and 420 is inserted between the pair of sidewalls 442 , and the rear end of the sidewall 442 is rounded in a convex arc shape. A plurality of grooves 443 are formed to be spaced apart from each other by a predetermined interval along the rear end edge of the side wall 442, and the locking pin 451 of the QR lever 450 passes through the first and second support members 410 and 420. It is fixed by being caught in the groove (443).

For example, as shown in the figure, in the case of the inclination adjustment bracket 440 for supporting the inclination angle of the first support member 410, from the upper edge of the side wall 442 to the rear edge of the side wall 442 having a plurality of grooves 443. It may be formed in an arc shape. In addition, in the case of the inclination adjustment bracket 440 supporting the inclination angle of the second support member 420 , it may be formed in an arc shape having a plurality of grooves 443 from the rear edge of the side wall 442 to the lower end.

One end of the first and second support members 410 and 420 is respectively inserted into the inclination adjustment bracket 440 and fixed by the QR lever 450. At this time, among the plurality of grooves 443, the QR lever 450 is caught. By appropriately selecting the recess 443 into which the pin 451 is inserted, the inclination angle of the first and second support members 410 and 420 can be adjusted and fixed.

8 is a state diagram of a crack detection robot according to an embodiment of the present invention.

As shown in FIG. 8 , the crack detection robot 100 according to an embodiment of the present invention detects cracks using the mounted measuring equipment while going up and down along the surface of the structure 10 . At this time, the drive motors 310 at both ends of the body 200 operate to pull the rope 20 while lifting and lowering the body 200, and it is also possible for either one of the drive motors 310 to operate.

The crack detection robot 100 according to an embodiment of the present invention detects a crack on the surface of the structure 10 when the body 200 is lifted, and analyzes the detected crack to diagnose the safety of the structure 10 . . For example, as shown in the drawing, the camera 30 is mounted on the mounting mount 230, and the surface of the structure 10 is photographed when ascending and descending. It is possible to more effectively diagnose the safety of the structure 10 by exploring the risk level and the like.

Although the embodiments of the present invention have been described above, it is understood that those of ordinary skill in the art to which the present invention pertains may make various modifications without departing from the scope of the claims of the present invention.

100: crack detection robot 200: body
201: unit body 230: mounting mount
300: driving unit 310: driving motor
320: pulley housing 330: driving pulley
400: support 410: first support member
420: second support member 440: inclination adjustment bracket
500: coupling member 600: clamp member
700: QR lever 710: bonding pad

Claims (10)

body;
a pair of driving units respectively provided at both ends of the body and elevating the body by rope traction; and
It is provided at the rear end of the body and includes at least one support part supported to be movable in the vertical direction along one surface of the structure,
The body includes a base part and a coupling part protruding backward from the rear surface of the base part and extending in the longitudinal direction of the base part, and a plurality of unit bodies are continuously coupled in the longitudinal direction by a coupling member,
The coupling member includes at least one clamp member provided on one side of the coupling part to mutually couple a pair of adjacent unit bodies, and at least one QR lever provided on the other side of the coupling part to face the clamp member Crack detection system, characterized in that. delete delete delete The method according to claim 1,
The body, crack detection system, characterized in that it further comprises at least one mounting mount coupled to one side of the coupling portion for mounting the measuring equipment to protrude to the rear of the coupling portion. delete delete body;
a pair of driving units respectively provided at both ends of the body and elevating the body by rope traction; and
It is provided at the rear end of the body and includes at least one support part supported to be movable in the vertical direction along one surface of the structure,
The support part is formed at one end of the first support member so that one end is coupled to the rear end of the body and the other end is extended to be inclined upward, and an inclination angle of the first support member with respect to the body can be adjusted. an inclination adjusting part being spaced apart from the first support member by a predetermined distance, one end coupled to the rear end of the body and the other end extending to be inclined downward; Crack detection system comprising a support roller rotatably coupled. delete 9. The method of claim 8,
The inclination adjusting unit includes a tilt control bracket coupled to the rear end of the body and having a plurality of engaging grooves formed along the rear end edge, and a QR lever penetrating the first support member and inserting a locking pin into the engaging groove. Crack detection system, characterized in that.

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