CN218628189U

CN218628189U - Crack detection equipment

Info

Publication number: CN218628189U
Application number: CN202223391618.4U
Authority: CN
Inventors: 李旭; 常友明; 王亮; 李鑫; 杜琪琪; 李腊梅; 李培辉
Original assignee: Gansu Jiaoda Engineering Testing S&t Co ltd
Current assignee: Gansu Jiaoda Engineering Testing S&t Co ltd
Priority date: 2022-12-12
Filing date: 2022-12-12
Publication date: 2023-03-14
Anticipated expiration: 2032-12-12

Abstract

The utility model relates to a crack detection equipment field specifically discloses a crack detection equipment, including detector host computer and ultrasonic probe, through cable electric connection between detector host computer and the ultrasonic probe, ultrasonic probe's quantity is two sets of, and is two sets of ultrasonic probe rotates respectively to be connected at the open end of two sets of U-shaped chute spare, and the open end of two sets of U-shaped chute spare is close to each other, and two sections equal sliding connection that are parallel to each other on the U-shaped chute spare are at the dead lever. The utility model discloses well two sets of U-shaped chute spare can be close to each other or keep away from, will drive two sets of ultrasonic probe and be close to each other when two sets of U-shaped chute spare are close to for interval between two sets of ultrasonic probe diminishes, otherwise, interval grow between two sets of ultrasonic probe, and interval between two sets of ultrasonic probe can directly read out through the scale mark on the dead lever, thereby make interval adjustment between the ultrasonic probe more convenient, accurate.

Description

Crack detection equipment

Technical Field

The utility model relates to a crack detection equipment field, in particular to crack detection equipment.

Background

Cracks often occur on concrete pavements, bridges, wall surfaces and the like due to various factors, the existence of the concrete cracks leads to the reduction of structural rigidity on one hand and the reduction of structural use performance on the other hand, and on the other hand, the corrosion of the environment to a concrete structure is possibly accelerated, so that a concrete surface protective layer is peeled off and the durability of the structure is influenced, therefore, in order to detect the danger degree of the cracks, the crack detection equipment is often used for detecting parameters such as the width and the depth of the cracks, and corresponding protective measures can be taken according to the damage degree of the actual cracks.

At present, the ultrasonic crack detector is mostly adopted for detecting the crack depth smaller than 50 cm, the device comprises a detector host and two ultrasonic probes, the ultrasonic probes are electrically connected with the detector host through cables, when in actual operation, a couplant needs to be firstly coated on the two ultrasonic probes, then the ends of the two ultrasonic probes are aligned and in press contact with each other to calibrate the detector, after the calibration is finished, the two ultrasonic probes are contacted with the detection points drawn in advance to detect the crack depth, and obviously, the prior detection device has the following defects in practical application:

1. when the detector is calibrated, two ultrasonic probes coated with a coupling agent are generally aligned by a human hand, and the ends of the ultrasonic probes are contacted with each other by pressing, however, the human hand can slightly shake when holding the ultrasonic probes, and the coupling agent between the ultrasonic probes can further cause the ultrasonic probes to easily slip, so that the two groups of ultrasonic probes are unstable when being contacted, the calibration of the detector is influenced, and the accuracy of an actual detection result is further influenced;

2. because ultrasonic probe's quantity is two sets of, need a measurement personnel to press two sets of ultrasonic probe in crack both sides or around (hold an ultrasonic probe by one hand) when detecting, still need a measurement personnel operation detection instrument host computer, this will cause human resource's waste, and the interval between two sets of ultrasonic probe is mostly 100mm, 150mm and 200mm when actually surveying, and the mode that adopts the ruler to measure at present is mostly confirmed, and this obviously can greatly reduced work efficiency.

Therefore, it is necessary to invent a crack detection apparatus to solve the above problems.

Disclosure of Invention

An object of the utility model is to provide a crack check out test set to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a crack detection equipment, includes detector host computer and ultrasonic probe, through cable electric connection between detector host computer and the ultrasonic probe, the quantity of ultrasonic probe is two sets of, and is two sets of the ultrasonic probe rotates the open end of connecting at two sets of U-shaped chute spare respectively, and the open end of two sets of U-shaped chute spare is close to each other, and two sections equal sliding connection that are parallel to each other on the U-shaped chute spare are on the dead lever, through vertically hollow tube fixed connection with it between two sets of dead levers, the lateral wall of dead lever is equipped with groove spare, and the bottom of U-shaped chute spare is equipped with the bellying that matches each other with groove spare, and is two sets of ultrasonic probe can be close to each other or keep away from, is equipped with the scale mark that carries out the measurement to the interval between the ultrasonic probe on the dead lever, and wherein, two sets of ultrasonic probe can overturn when being close to each other to the position of axis coincidence, and the one end that the cable was kept away from to the ultrasonic probe after just overturning is close to each other.

Preferably, ultrasonic probe's external connection has fixed cover, the periphery of fixed cover and the one end fixed connection of dwang, and the other end of dwang is connected with the upset subassembly, and the upset subassembly control ultrasonic probe revolutes the dwang rotation in the inside of U-shaped chute spare, dwang and dead lever mutually perpendicular setting.

Preferably, the upset subassembly includes mounting box, rack, driving gear and driven gear, mounting box fixed connection is close to the upper surface of dead lever one end at U-shaped chute spare, and the inside of mounting box and U-shaped chute spare communicates each other, and the dwang stretches into the inside of mounting box, and fixes being equipped with coaxial driven gear on the dwang with it, and the inside of mounting box is located driven gear's below and is equipped with the driving gear with driven gear intermeshing, the surface of dead lever be equipped with driving gear assorted rack.

Preferably, the rack is located the first groove of accomodating of dead lever upper surface, and the bottom of rack passes through compression spring and the first bottom fixed connection who accomodates the groove, the bottom of rack still with the one end fixed connection of first stay cord, the bottom in first groove of accomodating is stretched out to the other end of first stay cord to the inside that penetrates the hollow tube is connected with the first subassembly of dragging.

Preferably, the first pulling component comprises a threaded rod and a thread groove, the thread groove is located at one end, away from the fixing rod, of the hollow tube, the threaded rod is connected to the inside of the thread groove in a threaded mode, and one end, located inside the thread groove, of the threaded rod is fixedly connected with one end, away from the rack, of the first pull rope.

Preferably, a third accommodating groove is formed in the inner wall of the protruding portion, and a pressing plate which can be far away from or close to the fixing rod is arranged inside the third accommodating groove.

Preferably, one end, deviating from the fixed rod, of the pressing plate is fixedly connected with the bottom of the third accommodating groove through a compression spring, one side, deviating from the fixed rod, of the pressing plate is fixedly connected with one end of the second pull rope, and the other end of the second pull rope is connected with the second pulling assembly.

Preferably, the second is dragged the subassembly and is accomodate the groove including dragging pole and second, the second is accomodate the groove and is located the one end that the dead lever was kept away from to U-shaped spout spare, and the bottom that the groove was accomodate to the second is through compression spring with drag pole fixed connection, the one end that the clamp plate was kept away from to the second stay cord with drag pole fixed connection, drag the one end that the second stay cord was dragged when the pole removed to the direction that is close to second storage tank bottom.

The utility model discloses a technological effect and advantage:

1. in the utility model, two groups of U-shaped sliding groove parts can be close to or far away from each other, and the two groups of U-shaped sliding groove parts can drive two groups of ultrasonic probes to be close to each other when being close to each other, so that the distance between the two groups of ultrasonic probes is reduced, otherwise, the distance between the two groups of ultrasonic probes is enlarged, and the distance between the two groups of ultrasonic probes can be directly read through the scale marks on the fixed rod, thereby the distance between the ultrasonic probes is more convenient and accurate;

2. because two groups of ultrasonic probes are positioned in the U-shaped chute piece, the fixed rod, the U-shaped chute piece and the hollow tube form a whole, the two groups of ultrasonic probes can be simultaneously taken up by holding the hollow tube by hands, and can also be simultaneously placed on a road surface, a bridge or a wall surface with cracks, and the like, and the operation can be completed without using two hands, so that one hand of a detector can be liberated, and the liberated hand can be used for operating a detector host, so that one person can also independently complete the detection of crack parameters, and the waste of manpower is avoided;

3. two sets of ultrasonic probe can take place the upset when being close to each other, and the one end that the cable was kept away from to ultrasonic probe is corresponding during the upset, thereby after ultrasonic probe upset, can keep away from the one end of cable with the couplant coating at ultrasonic probe, then continue to be close to two sets of ultrasonic probe each other until the contact, can carry out the calibration work of this equipment this moment, owing to press the contact through the tip of U-shaped chute spare with two sets of ultrasonic probe, and need not the people hand and continuously press ultrasonic probe, two sets of ultrasonic probe unstable phenomenon that the hand shake of having avoided leading to take place, make the calibration of this equipment more accurate, thereby make the more accuracy of testing result.

Drawings

Fig. 1 is the external structure schematic diagram of the crack detection device of the present invention.

Fig. 2 is an enlarged schematic structural view of a point a in fig. 1 according to the present invention.

Fig. 3 is a top view of the crack detection device of the present invention.

Fig. 4 is a cross-sectional view of the U-shaped chute member of the present invention along plane B-B.

Fig. 5 is an enlarged schematic structural diagram of the present invention at C in fig. 4.

Fig. 6 is a schematic view of the connection of the pulling rod to the U-shaped chute member according to the present invention.

Fig. 7 is a schematic view of the connection of the rack on the fixing rod according to the present invention.

FIG. 8 is the schematic diagram of the internal structure of the hollow tube of the present invention

In the figure: 1. a detector host; 2. an ultrasonic probe; 3. fixing the rod; 4. a U-shaped chute member; 5. mounting a box; 6. a rack; 7. a cable; 8. pulling the rod; 9. a hollow tube; 10. a threaded rod; 11. a thread groove; 12. a first receiving groove; 13. fixing a sleeve; 14. rotating the rod; 15. a driving gear; 16. a driven gear; 17. a first pull cord; 18. a boss portion; 19. a groove member; 20. a third receiving groove; 21. a second pull cord; 22. pressing a plate; 23. a second accommodating groove; 24. the handle is rotated.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a crack detection equipment as shown in fig. 1-8, including detector host computer 1 and ultrasonic probe 2, through cable 7 electric connection between detector host computer 1 and the ultrasonic probe 2, the quantity of ultrasonic probe 2 is two sets of, and is two sets of ultrasonic probe 2 rotates respectively and connects the open end at two sets of U-shaped chute spare 4, and the open end of two sets of U-shaped chute spare 4 is close to each other, and two sections equal sliding connection that are parallel to each other on U-shaped chute spare 4 are on dead lever 3, through 9 fixed connection of vertically hollow tube with it between two sets of dead lever 3, the lateral wall of dead lever 3 is equipped with groove 19, and the bottom of U-shaped chute spare 4 is equipped with the bellying 18 that matches each other with groove 19, and is two sets of ultrasonic probe 2 can be close to each other or keep away from, is equipped with the scale mark that carries out the measurement to the interval between the ultrasonic probe 2 on the dead lever 3, and wherein, two sets of ultrasonic probe 2 are when being close to each other, and ultrasonic probe 2 can overturn the position of axis coincidence, and the one end that the ultrasonic probe kept away from cable 7 is close to each other after just overturning.

The utility model discloses in the time of actual operation, because two sets of U-shaped chute spare 4 and the mutual sliding connection of dead lever 3, thereby two sets of U-shaped chute spare 4 can be close to each other or keep away from, two sets of U-shaped chute spare 4 will drive two sets of ultrasonic probe 2 and be close to each other when being close to, make the interval between two sets of ultrasonic probe 2 diminish, otherwise, when two sets of U-shaped chute spare 4 keep away from each other, two sets of ultrasonic probe 2 also keep away from each other, interval grow between two sets of ultrasonic probe 2, and interval between two sets of ultrasonic probe 2 can directly read out through the scale mark on the dead lever 3, thereby make the interval adjustment between the ultrasonic probe 2 more convenient, accurate.

Simultaneously, because two sets of ultrasonic probe 2 all are located the inside of U-shaped chute spare 4, dead lever 3, a whole is constituteed to U-shaped chute spare 4 and hollow tube 9, then can take up two sets of ultrasonic probe 2 simultaneously through handheld hollow tube 9, also can place two sets of ultrasonic probe 2 simultaneously on the road surface that has the crack, bridge or wall isotructure, and need not use two hands just can accomplish above-mentioned operation, this can make testing personnel's a hand obtain liberation, and that hand of liberation then can be used for operating detector host computer 1, thereby also can solitary completion crack parameter's detection alone, avoid causing the waste of manpower.

Further, two sets of ultrasonic probe 2 can take place the upset when being close to each other, and ultrasonic probe 2 keeps away from the one end of cable 7 corresponding during the upset, thereby after ultrasonic probe 2 overturns, can coat the couplant in ultrasonic probe 2 one end of keeping away from cable 7, then continue to be close to two sets of ultrasonic probe 2 each other until the contact again, can carry out the calibration work of this equipment this moment, because press the contact through the tip of U-shaped chute spare 4 with two sets of ultrasonic probe 2, and need not the people hand and continue to press ultrasonic probe 2, the unstable phenomenon of two sets of ultrasonic probe 2 contacts of having avoided the hand shake to lead to takes place, make the calibration of this equipment more accurate, thereby make the more accurate of testing result.

The external connection of ultrasonic probe 2 has fixed cover 13, the periphery of fixed cover 13 and the one end fixed connection of dwang 14, the other end of dwang 14 is connected with the upset subassembly, upset subassembly control ultrasonic probe 2 revolutes the dwang 14 rotation in the inside of U-shaped chute spare 4, thereby control ultrasonic probe 2's rotation, can make two sets of ultrasonic probe 2 keep away from the one end of cable 7 and be close to each other when ultrasonic probe 2 is rotatory, thereby be convenient for carry out the calibration of this equipment, dwang 14 sets up with 3 mutually perpendicular of dead lever.

Specifically, the upset subassembly includes mounting box 5, rack 6, driving gear 15 and driven

gear

16, 5 fixed connection of mounting box are at the upper surface that U-shaped chute spare 4 is close to 3 one end of dead lever, and the inside intercommunication of mounting box 5 and U-shaped chute spare 4, and dwang 14 stretches into the inside of mounting box 5, and fixed being equipped with coaxial driven gear 16 with it on the dwang 14, the below that the inside of mounting box 5 is located driven gear 16 is equipped with the driving gear 15 with 16 intermeshing of driven gear, the surface of dead lever 3 be equipped with driving gear 15 assorted rack 6.

In actual operation, when two sets of U-shaped chute spare 4 are close to each other, driving gear 15 will be close to rack 6 on the dead lever 3 gradually this moment, driving gear 15 will take place the meshing transmission with rack 6 when through rack 6, thereby drive the rotation of driving gear 15, driving gear 15 rotates and will drive the rotation of driven gear 16 on the dwang 14 again, and make dwang 14 drive ultrasonic probe 2 upset, and ultrasonic probe 2 is after the upset, the one end that cable 7 was kept away from to two sets of ultrasonic probe 2 is close to each other, driving gear 15 here plays the effect of reversing the upset direction of ultrasonic probe 2, make the one end that cable 7 was kept away from to ultrasonic probe 2 can be close to each other, and in order to make two sets of ultrasonic probe 2 keep the relative state of tip when being close to each other all the time, dwang 14 should be interference connection with mounting box 5, also be that the dwang 14 is rotatory can not automatic re, in addition, in order to make the rotatory comparatively laborsaving dwang of dwang 14, and can fix at arbitrary angle, can set up the elastic compressing component in the outside of 14, the elastic compressing component can be the rubber sleeve, emulsion sleeve, etc.

Because ultrasonic probe 2 can take place the upset when the rack 6, in order to prevent that ultrasonic probe 2 from taking place the upset and influencing the detection when interval adjustment between two sets of ultrasonic probe 2 rack 6 is located the first groove 12 of accomodating of dead lever 3 upper surface, and the bottom fixed connection of groove 12 is accomodate through compression spring and first in the bottom of rack 6, the bottom of rack 6 still with the one end fixed connection of first stay cord 17, the first bottom of accomodating groove 12 is stretched out to the other end of first stay cord 17 to the inside that penetrates hollow tube 9 is connected with the first subassembly of dragging.

The rack 6 can be dragged to the first bottom of accomodating groove 12 to the subassembly of first dragging, and accomodate rack 6 in the first inside of accomodating groove 12, thereby driving gear 15 can not again with the transmission of rack 6 meshing when through rack 6, then driven gear 16, dwang 14 just can not rotate yet, thereby ultrasonic probe 2 will not take place the upset, then can not influence and press ultrasonic probe 2 and measure the crack depth on road surface, bridge and wall isotructure.

Specifically, the first subassembly of dragging includes threaded rod 10 and thread groove 11, thread groove 11 is located the one end that dead lever 3 was kept away from to hollow tube 9, the inside spiro union of thread groove 11 has threaded rod 10, threaded rod 10 can be to the inside screw in or the back-out of thread groove 11, and in order to facilitate operating threaded rod 10, can set up rotation handle 24 at the tip of threaded rod 10, as shown in fig. 1, threaded rod 10 is located the inside one end of thread groove 11 and the one end fixed connection that rack 6 was kept away from to first stay cord 17, so when screwing out threaded rod 10 from the inside of thread groove 11, the one end of first stay cord 17 will be dragged to threaded rod 10 this moment, the other end of first stay cord 17 drives rack 6 and accomodates in the inside of first groove 12, avoid driving gear 15 to mesh with rack 6 when rack 6.

Conversely, when threaded rod 10 was screwed into to the thread groove 11, threaded rod 10 will release the one end of first stay cord 17 this moment, and first stay cord 17 no longer pulls rack 6, and rack 6 will reset under fixed connection's with it compression spring's effect to stretch out the tip of first groove 12 of accomodating, then driving gear 15 will rotate once more when through rack 6, and drive ultrasonic probe 2 upset, can carry out the calibration of equipment this moment.

The utility model discloses in interval between two sets of ultrasonic probe 2 can be adjusted through keeping away from each other or being close to of U-shaped chute spare 4, in order to keep away from each other U-shaped chute spare 4 on dead lever 3 fixed position, also be exactly with the fixed position between two sets of ultrasonic probe 2 the inner wall of bellying 18 has been seted up the third and has been accomodate groove 20, the inside of accomodating groove 20 of third is equipped with can keep away from or the clamp plate 22 that is close to dead lever 3, as shown in fig. 5, so when clamp plate 22 is close to dead lever 3, clamp plate 22 will compress tightly the inner wall at recess 19, thereby prop up the clearance between bellying 18 and recess 19 tightly, prevent that U-shaped chute spare 4 from sliding at will in the outside of dead lever 3, and when clamp plate 22 accomodates in the inside of accomodating groove 20 in the third, U-shaped chute spare 4 can slide easily in the outside of dead lever 3 this moment, be convenient for adjust the interval between two sets of ultrasonic probe 2, also conveniently overturn and carry out the calibration of equipment.

In order to realize the back and forth movement of the pressing plate 22 in the third accommodating groove 20, one end of the pressing plate 22, which is far away from the fixing rod 3, is fixedly connected with the bottom of the third accommodating groove 20 through a compression spring, one side of the pressing plate 22, which is far away from the fixing rod 3, is also fixedly connected with one end of the second pulling rope 21, and the other end of the second pulling rope 21 is connected with the second pulling assembly.

The second pulling member can pull the pressing plate 22 toward the bottom of the third accommodating groove 20, and the pressing plate 22 is accommodated inside the third accommodating groove 20, and when the second pulling member releases the pressing plate 22, the pressing plate 22 will be pressed into the groove member 19 on the fixing rod 3 by the compression spring fixedly connected with the pressing plate 22, so that the U-shaped chute member 4 is fixed on the fixing rod 3.

Specifically, the second is dragged the subassembly and is accomodate groove 23 including dragging pole 8 and second, the second is accomodate groove 23 and is located the one end that dead lever 3 was kept away from to U-shaped spout spare 4, and the second is accomodate the bottom of groove 23 and is passed through compression spring and drag pole 8 fixed connection, and the one end that clamp plate 22 was kept away from to second stay cord 21 with drag pole 8 fixed connection, drag pole 8 and drag the one end of second stay cord 21 when moving to the direction that is close to the second and accomodates groove 23 bottom.

When the pull rod 8 moves towards the direction close to the bottom of the second accommodating groove 23, the pull rod 8 pulls one end of the second pull rope 21, and the other end of the second pull rope 21 drives the pressing plate 22 to be accommodated in the third accommodating groove 20, so that the U-shaped sliding groove piece 4 can move on the fixing rod 3 conveniently.

The working principle is as follows: the utility model discloses in the time of actual operation, because two sets of U-shaped chute spare 4 and the mutual sliding connection of dead lever 3, thereby two sets of U-shaped chute spare 4 can be close to each other or keep away from, two sets of U-shaped chute spare 4 will drive two sets of ultrasonic probe 2 and be close to each other when being close to, make the interval between two sets of ultrasonic probe 2 diminish, otherwise, when two sets of U-shaped chute spare 4 keep away from each other, two sets of ultrasonic probe 2 also keep away from each other, interval grow between two sets of ultrasonic probe 2, and interval between two sets of ultrasonic probe 2 can directly read out through the scale mark on the dead lever 3, thereby make the interval adjustment between the ultrasonic probe 2 more convenient, accurate.

Further, two sets of ultrasonic probe 2 can take place the upset when being close to each other, and ultrasonic probe 2 keeps away from the one end of cable 7 corresponding during the upset, thereby after ultrasonic probe 2 overturns, can be with the couplant coating in ultrasonic probe 2 one end of keeping away from cable 7, then continue to be close to two sets of ultrasonic probe 2 each other until the contact, the calibration work of this equipment can be carried out this moment, because press the contact through the tip of U-shaped chute spare 4 with two sets of ultrasonic probe 2, and need not the people hand and continuously press ultrasonic probe 2, the unstable phenomenon of two sets of ultrasonic probe 2 contacts of having avoided the hand shake to lead to takes place, make the calibration accuracy more of this equipment, thereby make the more accuracy of testing result.

Claims

1. The utility model provides a crack detection equipment, includes detector host computer (1) and ultrasonic probe (2), its characterized in that: the ultrasonic detector is characterized in that the detector host (1) and the ultrasonic probes (2) are electrically connected through a cable (7), the number of the ultrasonic probes (2) is two, the two ultrasonic probes (2) are respectively rotatably connected at the open ends of the two U-shaped sliding groove pieces (4), the open ends of the two U-shaped sliding groove pieces (4) are close to each other, two sections of the U-shaped sliding groove pieces (4) which are parallel to each other are connected onto the fixing rods (3) in a sliding mode, the two fixing rods (3) are fixedly connected through hollow pipes (9) which are perpendicular to the fixing rods, the side walls of the fixing rods (3) are provided with groove pieces (19), the bottom ends of the U-shaped sliding groove pieces (4) are provided with protruding portions (18) which are matched with the groove pieces (19) mutually, the two ultrasonic probes (2) can be close to or far away from each other, scale lines for measuring the distance between the ultrasonic probes (2) are arranged on the fixing rods (3), and when the two ultrasonic probes (2) are close to each other, the two ultrasonic probes (2) are close to the position of an axis line, and one end, far away from the cable (7) after being overturned, of each other ultrasonic probes (2) are close to the other.

2. A crack detection device as claimed in claim 1, characterized in that: the external connection of ultrasonic probe (2) has fixed cover (13), the periphery of fixed cover (13) and the one end fixed connection of dwang (14), and the other end of dwang (14) is connected with the upset subassembly, and upset subassembly control ultrasonic probe (2) revolutes dwang (14) rotation in the inside of U-shaped chute spare (4), dwang (14) and dead lever (3) mutually perpendicular setting.

3. A crack detection device as claimed in claim 2, characterized in that: the upset subassembly includes mounting box (5), rack (6), driving gear (15) and driven gear (16), mounting box (5) fixed connection is close to the upper surface of dead lever (3) one end at U-shaped spout spare (4), and mounting box (5) and the inside of U-shaped spout spare (4) communicate each other, and dwang (14) stretch into the inside of mounting box (5), and dwang (14) are gone up the fixed driven gear (16) that is equipped with it, and the below that the inside of mounting box (5) is located driven gear (16) is equipped with driving gear (15) with driven gear (16) intermeshing, the surface of dead lever (3) is equipped with and drives gear (15) assorted rack (6).

4. A crack detection device as claimed in claim 3, characterized in that: the utility model discloses a fixed pole, including dead lever (3), rack (6), first storage groove (12) of dead lever (3) upper surface, and the bottom of rack (6) is through compression spring and the first bottom fixed connection who takes in groove (12), the bottom of rack (6) still with the one end fixed connection of first stay cord (17), the other end of first stay cord (17) stretches out the first bottom of taking in groove (12) to the inside that penetrates hollow tube (9) is connected with the first subassembly of dragging.

5. A crack detection device as claimed in claim 4, characterized in that: the first pulling assembly comprises a threaded rod (10) and a threaded groove (11), the threaded groove (11) is located at one end, far away from the fixing rod (3), of the hollow tube (9), the threaded rod (10) is connected to the inner portion of the threaded groove (11) in a threaded mode, and the threaded rod (10) is located at one end, far away from the rack (6), of the inner portion of the threaded groove (11) and the first pull rope (17) and is fixedly connected with one end of the first pull rope.

6. A crack detection device as claimed in claim 5, characterized in that: the inner wall of the bulge part (18) is provided with a third accommodating groove (20), and a pressing plate (22) which can be far away from or close to the fixing rod (3) is arranged in the third accommodating groove (20).

7. A crack detection device as claimed in claim 6, characterized in that: one end of the pressing plate (22) deviating from the fixing rod (3) is fixedly connected with the bottom of the third accommodating groove (20) through a compression spring, one side of the pressing plate (22) deviating from the fixing rod (3) is fixedly connected with one end of the second pull rope (21), and the other end of the second pull rope (21) is connected with the second pull assembly.

8. A crack detection device as claimed in claim 7, characterized in that: the second is dragged the subassembly and is accomodate groove (23) including dragging pole (8) and second, the second is accomodate groove (23) and is located the one end that dead lever (3) were kept away from in U-shaped spout spare (4), and the second is accomodate the bottom of groove (23) and is passed through compression spring and drag pole (8) fixed connection, and the one end that clamp plate (22) were kept away from in second stay cord (21) with drag pole (8) fixed connection, drag pole (8) to the direction that is close to the second and accomodate groove (23) bottom when removing the one end of dragging second stay cord (21).