CN213398251U - Device for detecting defects of underwater surface of dam - Google Patents

Abstract

The utility model discloses a device for dam surface defect detection under water belongs to radio wave check out test set technical field. The device comprises a carrying device, a holder arranged on the carrying device and detection equipment arranged on the holder; a first electric rod is transversely arranged on the inner edge of the frame body and is electrically connected with the electronic cabin, a connecting rod is arranged at the output end of the first electric rod, and a sucker assembly is arranged at the tail end of the connecting rod; a submersible pump is also arranged in the frame body, the output end of the submersible pump is communicated with a water pipe, the input end of the submersible pump is communicated with the outside, and the tail end of the water pipe is connected with the sucker component so as to pump water away from the adsorption end of the sucker component or input water to the adsorption end of the sucker component; the detection equipment comprises an optical camera and a three-dimensional imaging sonar which are electrically connected with the electronic cabin. The utility model provides an underwater defect detection robot among the correlation technique be difficult to control when being close to the dam surface, the stable image information who acquires the dam surface and the problem of the sound wave information of reflection of being not convenient for have good application prospect.

Description

Device for detecting defects of underwater surface of dam

Technical Field

The utility model belongs to the technical field of radio wave check out test set, concretely relates to a device that is used for dam surface defect to detect under water.

Background

In the domestic water conservancy and hydropower engineering, 9 thousands of reservoir dams exist, and in the safety detection and maintenance process of the reservoir dams, the potential safety operation hazards such as underwater concrete defects, dam leakage, panel cracks and elutriation, metal structure corrosion, reservoir sedimentation and the like need to be detected. For the detection of underwater structures such as a post-dam stilling basin, a tailrace, a sea dam and the like, the prior art adopts a multi-beam and side-scan sonar to scan and measure along a certain measuring line, and the whole underwater area can be rapidly scanned.

In the detection work of underwater engineering, an underwater detection robot is widely used for underwater environment monitoring, engineering progress and quality monitoring and the like, and an imaging system of the underwater detection robot is generally divided into two categories, namely underwater optical imaging and underwater sonar imaging. Underwater sonar imaging is a technique of imaging through electroacoustic conversion and information processing by using the propagation and reflection characteristics of sound waves in water. However, the underwater defect inspection robot in the related art is difficult to control because the water flow rate is fast when approaching the surface of the dam, and is inconvenient to stably acquire image information and reflected sound wave information of the surface of the dam.

Aiming at the problems that an underwater defect detection robot in the related art is difficult to control when approaching the surface of a dam and is inconvenient to stably obtain image information and reflected sound wave information of the surface of the dam, an effective solution is not provided at present.

Disclosure of Invention

In order to solve the defects in the prior art, the utility model aims to provide a device for dam surface defect detection under water has solved defect detection robot under water and has been difficult to control when being close to the dam surface, the stable problem of the sound wave information of the image information and the reflection of acquireing the dam surface not convenient for.

The utility model discloses a realize through following technical scheme:

the utility model discloses a device for detecting the defects of the underwater surface of a dam, which comprises a carrying device, a holder arranged on the carrying device and a detection device arranged on the holder; the mounting device includes: the electronic device comprises a frame body, a buoyancy block, a propeller and an electronic cabin, wherein a first electric rod is transversely arranged on the inner edge of the frame body and is connected with the electronic cabin; the frame body is also internally provided with a submersible pump, the submersible pump is connected with the electronic cabin, the input end of the submersible pump is communicated with a water pipe, the output end of the submersible pump is communicated with the outside, and the tail end of the water pipe is connected with the sucker component and is used for pumping water away from the adsorption end of the sucker component or inputting water to the adsorption end of the sucker component; the detection equipment comprises an optical camera and a three-dimensional imaging sonar which are connected with an electronic cabin.

Preferably, the sucking disc subassembly is equipped with the first water route with each absorption mouth intercommunication including fixing the disk body at the connecting rod end and establishing a plurality of absorption mouths at the disk body terminal surface in the disk body, first water route and water pipe intercommunication.

Further preferably, the first electric rod comprises a cylinder body and a piston rod arranged on the cylinder body, and an inner threaded hole is formed in one end, close to the connecting rod, of the piston rod along the axial direction; one end of the connecting rod facing the piston rod is provided with a groove along the radial direction, a connecting piece made of a non-magnetic material is rotationally arranged in the groove, the connecting piece comprises a rotating part positioned in the groove and a connecting part extending out of the groove, the inner side of the groove is provided with an annular sliding groove, and the outer side of the rotating part is provided with a sliding ring in sliding connection with the sliding groove;

the connecting part is in threaded connection with the internal thread hole, a clamping groove is formed in the outer side of the connecting part along the radial direction, a mounting groove corresponding to the clamping groove is formed in the inner side of the groove, a spring and a first magnet are arranged in the mounting groove, the upper end of the spring is fixedly connected with the upper end of the mounting groove, the lower end of the spring is fixedly connected with the first magnet, the first magnet is in sliding connection with the mounting groove, and the depth of the clamping groove is smaller than; the outer side of the connecting rod is detachably sleeved with a driving ring, and the inner side of the driving ring is provided with a second magnet which is repelled with the first magnet.

Further preferably, the plurality of groups of adsorption nozzles are distributed along the circumferential direction of the disc body, and the plurality of adsorption nozzles in each group are distributed along the radial direction of the disc body.

Further preferably, the draw-in groove is 4 and evenly distributed in the outside of rotation portion, and the mounting groove is 4 and with the draw-in groove one-to-one.

Further preferably, the connecting rod is cylindrical, the driving ring is formed by two semicircular arc pieces, one ends of the two arc pieces are hinged with each other, the second magnet is embedded in the inner sides of the arc pieces, and the inner diameter of the arc pieces is equal to the outer diameter of the connecting rod.

Further preferably, the outer circumferential surface of the connecting rod is provided with a positioning groove, the inner side of the arc piece is provided with a positioning bulge corresponding to the positioning groove, and the positioning groove corresponds to the mounting groove.

Further preferably, the outer side of the connecting rod is sleeved with two limit plates, and the two limit plates have a space for installing the driving ring.

Preferably, still be provided with the storage box in the framework, be provided with the tracer in the storage box, storage box tip is provided with the check valve, and it is provided with the piston to slide in the storage box, and the piston terminal surface is provided with the push rod, and push rod end-to-end connection has the electronic pole of second, and the electronic pole of second sets firmly in the framework.

Preferably, the cloud platform includes mechanical rotation cloud platform, and the upper portion of mechanical rotation cloud platform is equipped with the swinging boom that can vertical rotation, and check out test set fixes the top at the swinging boom.

Compared with the prior art, the utility model discloses following profitable technological effect has:

the utility model discloses a device that is used for dam surface defect to detect under water, reached and utilized first electronic pole to push the sucking disc subassembly to and paste tight dam surface, take out the water on sucking disc subassembly and dam surface from the purpose that forms negative pressure back location carrying device through the immersible pump, thereby realized being close to the region on dam surface under water and can be with the stable location of carrying device, make the technological effect of the image information of acquireing dam surface and the sound wave information of reflection that check out test set can be stable, and then solved the defect detection robot under water among the correlation technique and be difficult to control when being close to the dam surface, be not convenient for stable the problem of the image information of acquireing dam surface and the sound wave information of reflection, good application prospect has.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is an enlarged schematic view of a part a of the present invention;

FIG. 3 is a schematic structural view of the suction cup assembly of the present invention;

FIG. 4 is a schematic bottom view of the chuck assembly of the present invention;

fig. 5 is a schematic diagram of the driving ring structure of the present invention.

In the figure: the device comprises a frame body, a storage box, a piston, a detection device, a push rod, a rotating arm, a mechanical rotating tripod head, a second electric rod, a 9 electronic cabin, a 10 impeller, a 11 partition plate frame, a 12 submersible pump, a 13 first electric rod, a 14 water pipe, a 15 suction disc assembly, a 151 disc body, a 152 adsorption nozzle, a 153 water channel, a 16 connecting rod, a 17 piston rod, a 18 clamping groove, a 19 second magnet, a 20 limiting plate, a 21 driving ring, a 210 arc sheet, a 22 connecting part, a 23 rotating part, a 24 connecting part, a 25 spring, a 26 first magnet, a 27 positioning bulge, a 28 sliding ring and a 29 check valve.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used.

In this application, the terms "upper", "lower", "inside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "disposed," "provided," "connected," "secured," and the like are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1, the device for detecting defects on an underwater surface of a dam of the present invention comprises a carrying device, a holder disposed on the carrying device, and a detection device 4 disposed on the holder; wherein, carrying device is unmanned submersible, and carrying device includes: the electronic device comprises a frame body 1, a buoyancy block, a propeller 10 and an electronic cabin 9, wherein a first electric rod 13 is transversely arranged on the inner edge of the frame body 1, the first electric rod 13 is electrically connected with the electronic cabin 9, a connecting rod 16 is arranged at the output end of the first electric rod 13, and a sucker assembly 15 is arranged at the tail end of the connecting rod 16; a submersible pump 12 is further arranged in the frame body 1, the submersible pump 12 is electrically connected with the electronic cabin 9, the input end of the submersible pump 12 is communicated with a water pipe 14, the output end of the submersible pump 12 is communicated with the outside, and the tail end of the water pipe 14 is connected with a sucker component 15 so as to pump water away from the adsorption end of the sucker component 15 or input water to the adsorption end of the sucker component 15; the cloud platform is mechanical rotation cloud platform 7, and check out test set 4 contains optical camera and three-dimensional imaging sonar with electronic compartment 9 electric connection.

In the present embodiment, an unmanned submersible Robot (ROV) is a submersible device that performs manual operation under water by using an instrument device mounted on the ROV. The underwater ROV body is provided with a buoyancy material, a frame body 1, a propeller 10 and a corresponding electronic cabin 9, and the overwater control system transmits power and control signals to the underwater ROV body through an umbilical cable with a certain length and uploads data signals to the control system for output. The ROV body utilizes buoyancy material to adjust the size of load, selects through changing frame 1 to carry equipment such as high definition digtal camera, wide angle/little light camera, image sonar, three-dimensional scanning sonar, ultrashort baseline beacon, multi-functional manipulator, sampling instrument. The mechanical rotating cloud platform 7 can rotate horizontally for 180 degrees, a rotating arm 6 capable of rotating vertically for 360 degrees is arranged on the upper portion of the mechanical rotating cloud platform 7, and the detection equipment 4 is fixed on the top end of the rotating arm 6.

A plurality of partition racks 11 are arranged in the frame body 1, the first electric rod 13 and the submersible pump 12 are fixed on the corresponding partition racks 11, when the carrying device moves to a position close to the surface of the dam under water, the first electric rod 13 is controlled to drive the output end to extend, so that the connecting rod 16 and the sucker assembly 15 connected with the output ends thereof move and are close to the surface of the dam, at the moment, the first electric rod 13 continuously acts, so that the adsorption end of the sucker assembly 15 is close to the surface of the dam, since the carrying device is located under water during operation, there is water between the suction end of the suction cup assembly 15 and the surface of the dam, which is activated by controlling the submersible pump 12, water between the suction cup assembly 15 and the surface of the dam is pumped away through the water pipe 14 to form negative pressure, the device is firmly attached to the surface of the dam under the action of external water pressure, the carrying device can be positioned at the moment, and the defect information of the surface of the dam is stably acquired through the optical camera and the three-dimensional imaging sonar after the positioning; after the operation is finished, the impeller in the submersible pump 12 is controlled to rotate reversely to fill water in the external environment between the sucker assembly 15 and the surface of the dam, although the water pressure and the flow generated by the impeller rotating reversely are far smaller than those generated by the impeller rotating forwardly, the external water can still be guided into the sucker assembly 15, so that the pressure in the sucker assembly 15 is equal to the pressure of the external environment, the sucker assembly 15 can not adsorb the surface of the dam any more, at the moment, the sucker assembly 15 can be withdrawn by controlling the first electric rod 13, the first electric rod 13 and the sucker assembly 15 can be arranged into two groups, the carrying device can be positioned more stably, the carrying device can be positioned stably in an area close to the surface of the dam underwater, the technical effect that the detection equipment 4 can stably obtain image information and reflected sound wave information of the surface of the dam is achieved, and the problem that an underwater defect detection robot in the related technology is difficult to control when being close to the surface of the dam is solved, and it is inconvenient to stably acquire image information of the surface of the dam and reflected sound wave information.

As shown in fig. 3 and 4, the suction cup assembly 15 includes a tray body 151 fixed to the end of the connecting rod 16 and a plurality of suction nozzles 152 provided on an end surface of the tray body 151, a first water path 153 communicating with each suction nozzle 152 is provided in the tray body 151, and the first water path 153 communicates with the water pipe 14.

Because the surface of dam is not necessarily smooth, consequently through set up a plurality of adsorption nozzles 152 on disk body 151, adopt octopus sucking disc bionic structure, each adsorption nozzle 152 is through first water route 153 intercommunication, and first water route 153 leads to pipe 14 and realizes taking out and the input of water to adjust the pressure of adsorption nozzle 152, realize the stable surface of adsorbing at the dam with sucking disc subassembly 15.

As shown in fig. 1 and 2, the first electric rod 13 includes a cylinder and a piston rod 17 disposed on the cylinder, and an inner threaded hole is axially formed at one end of the piston rod 17 close to the connecting rod 16;

one end of the connecting rod 16 facing the piston rod 17 is radially provided with a groove, a connecting piece 24 made of a non-magnetic material is rotatably arranged in the groove, the connecting piece 24 comprises a rotating part 23 positioned in the groove and a connecting part 22 extending out of the groove, the inner side of the groove is provided with an annular sliding groove, and the outer side of the rotating part 23 is provided with a sliding ring 28 connected with the sliding groove in a sliding manner;

the connecting part 22 is in threaded connection with the internal threaded hole, a clamping groove 18 is formed in the outer side of the connecting part 22 along the radial direction, a mounting groove corresponding to the clamping groove 18 is formed in the inner side of the groove, a spring 25 and a first magnet 26 are arranged in the mounting groove, the upper end of the spring 25 is fixedly connected with the upper end of the mounting groove, the lower end of the spring 25 is fixedly connected with the first magnet 26, the first magnet 26 is in sliding connection with the mounting groove, and the depth of the clamping groove 18 is smaller than the length of;

the outer side of the connecting rod 16 is detachably sleeved with a driving ring 21, and the inner side of the driving ring 21 is provided with a second magnet 19 which is repelled with the first magnet 26.

It should be noted that, in this embodiment, the suction cup assembly 15 is fixed on the connecting rod 16, the connecting rod 16 is fixed on the piston rod 17 through the connecting piece 24 to be detachable, so as to facilitate replacement and installation of the suction cup assembly 15, in order to prevent the suction cup assembly 15 from being detached maliciously, the connecting piece 24 is divided into a connecting portion 22 in threaded connection with the piston rod 17 and a rotating portion 23 in rotating connection with the connecting rod 16, since the connecting portion 22 is provided with the clamping groove 18, a mounting groove is formed in a groove of the connecting rod 16, the spring 25 in the mounting groove enables the first magnet 26 to be completely located in the mounting groove without an external force, at this time, the rotating portion 23 is connected with a sliding groove in the connecting rod 16 through the sliding ring 28, at this time, if only the connecting rod 16 is rotated; when the sucker assembly 15 needs to be detached or installed, the driving ring 21 can be sleeved on the connecting rod 16, the second magnet 19 on the driving ring 21 corresponds to the first magnet 26, one outward ends of the first magnet 26 and the second magnet 19 repel each other, so that after the driving ring 21 is sleeved on, the first magnet 26 moves towards the clamping groove 18 on the connecting portion 22 under the action of magnetic force, the lower end of the first magnet is located in the clamping groove 18, the upper end of the first magnet is located in the installing groove, the connecting rod 16 and the connecting portion 22 are clamped through the first magnet 26, the connecting rod 16 can be rotated to drive the connecting piece 24 to rotate, the connecting piece 24 is screwed into or out of the inner threaded hole of the piston rod 17, and the sucker assembly 15 is installed and detached. For ease of illustration, fig. 2 shows the drive ring 21 installed without the first magnet 26 having moved into the pocket 18 under force.

The adsorption nozzles 152 are arranged into a plurality of groups distributed along the circumferential direction of the disc body 151, each group of adsorption nozzles 152 are arranged into a plurality of groups and distributed along the radial direction of the disc body 151, the disc body 151 can be adsorbed on the surface of the dam more stably, the sliding grooves are arranged into two groups and located at two ends of the rotating portion 23, the length of the connecting portion 22 is equal to that of the internal threaded hole, and the connecting portion of the connecting rod 16 and the piston rod 17 is tighter.

The clamping grooves 18 are arranged to be four and are evenly distributed on the outer side of the rotating portion 23, the mounting grooves are arranged to be four in one-to-one correspondence with the clamping grooves 18, and the stress of the connecting piece 24 is more stable through the four clamping grooves 18.

As shown in fig. 5, the connecting rod 16 is cylindrical, the driving ring 21 is composed of two semicircular arc pieces 210, one ends of the two arc pieces 210 are hinged to each other, the second magnet 19 is embedded inside the arc pieces 210, the inner diameter of the arc pieces 210 is equal to the outer diameter of the connecting rod 16, the two arc pieces 210 jointly form the annular driving ring 21, the two arc pieces 210 can be opened or closed through hinging, so that the driving ring 21 can be conveniently installed on the connecting rod 16, in order to facilitate the positioning of the driving ring 21 during installation, a positioning groove is arranged on the outer circumferential surface of the connecting rod 16, a positioning protrusion 27 corresponding to the positioning groove is arranged inside the arc pieces 210, the positioning groove corresponds to the installation groove, and the first magnet 26 and the second magnet 19 correspond to each other.

Two stop plates 20 are sleeved outside the connecting rod 16, the two stop plates 20 have a distance for installing the driving ring 21, and the stop plates 20 are used for facilitating the installation of the driving ring 21 to the position corresponding to the first magnet 26.

Still be provided with storage box 2 in the framework 1, be provided with the tracer in the storage box 2, 2 tip in the storage box are provided with check valve 29, and it is provided with piston 3 to slide in the storage box 2, and 3 terminal surfaces of piston are provided with push rod 5, and 5 end-to-end transmission of push rod are connected with the electronic pole 8 of second, and the electronic pole 8 of second sets firmly in framework 1 and is connected with electronic cabin 9.

For the condition that the surface of the dam has cracks to cause leakage, the leakage point is difficult to be confirmed due to the complex underwater environment, therefore, the frame body 1 is internally provided with the agent storage box 2, the agent storage box 2 is internally provided with a tracer in advance, the tracer can be made of pigment with tracer function, when leakage detection is needed, the second electric rod 8 can be controlled to drive the push rod 5 to move, so that the piston 3 is driven to move towards the right end in the agent storage box 2, the tracer agent in the agent storage box 2 is pushed to open and spray the check valve 29, the movement state of the tracer in the water is recorded in real time by an optical camera on the detection device 4, when a crack, a structural joint or a concrete damaged part of leakage exists in the area to be detected, the tracer enters the crack, the structural joint or the concrete damaged part along with leakage water flow, and a shore technician judges the leakage through the flowing state of the tracer.

Although some terms are used in the present invention, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the present invention and are to be construed as any additional limitation which is not in accordance with the spirit of the present invention. The above description is only used as an example to further illustrate the content of the present invention, so as to facilitate understanding, but not to represent that the embodiment of the present invention is limited to this, and any technical extension or re-creation according to the present invention is protected by the present invention.

Claims (10)

1. The device for detecting the defects of the underwater surface of the dam is characterized by comprising a carrying device, a holder arranged on the carrying device and a detection device (4) arranged on the holder; the mounting device includes: the device comprises a frame body (1), a buoyancy block, a propeller (10) and an electronic cabin (9), wherein a first electric rod (13) is transversely arranged on the upper inner edge of the frame body (1), the first electric rod (13) is connected with the electronic cabin (9), a connecting rod (16) is arranged at the output end of the first electric rod (13), and a sucker assembly (15) is arranged at the tail end of the connecting rod (16); a submersible pump (12) is further arranged in the frame body (1), the submersible pump (12) is connected with the electronic cabin (9), the input end of the submersible pump (12) is communicated with a water pipe (14), the output end of the submersible pump is communicated with the outside, and the tail end of the water pipe (14) is connected with the sucker component (15) and used for pumping water away from the adsorption end of the sucker component (15) or inputting water to the adsorption end of the sucker component (15); the detection equipment (4) comprises an optical camera and a three-dimensional imaging sonar which are connected with an electronic cabin (9).

2. The apparatus for detecting defects on an underwater surface of a dam as claimed in claim 1, wherein the suction cup assembly (15) comprises a plate body (151) fixed to the end of the connecting rod (16) and a plurality of suction nozzles (152) provided on the end surface of the plate body (151), a first water path (153) communicating with each suction nozzle (152) is provided in the plate body (151), and the first water path (153) communicates with the water pipe (14).

3. The device for detecting the defects of the underwater surface of the dam as claimed in claim 2, wherein the first electric rod (13) comprises a cylinder body and a piston rod (17) arranged on the cylinder body, and an internal threaded hole is formed in one end, close to the connecting rod (16), of the piston rod (17) along the axial direction; one end of the connecting rod (16) facing the piston rod (17) is provided with a groove along the radial direction, a connecting piece (24) made of a non-magnetic material is rotationally arranged in the groove, the connecting piece (24) comprises a rotating part (23) positioned in the groove and a connecting part (22) extending out of the groove, the inner side of the groove is provided with an annular sliding groove, and the outer side of the rotating part (23) is provided with a sliding ring in sliding connection with the sliding groove;

the connecting part (22) is in threaded connection with the internal threaded hole, a clamping groove (18) is formed in the outer side of the connecting part (22) along the radial direction, a mounting groove corresponding to the clamping groove (18) is formed in the inner side of the groove, a spring (25) and a first magnet (26) are arranged in the mounting groove, the upper end of the spring (25) is fixedly connected with the upper end of the mounting groove, the lower end of the spring is fixedly connected with the first magnet (26), the first magnet (26) is in sliding connection with the mounting groove, and the depth of the clamping groove (18) is smaller than the length of; a driving ring (21) is detachably sleeved on the outer side of the connecting rod (16), and a second magnet (19) which is repelled with the first magnet (26) is arranged on the inner side of the driving ring (21).

4. The apparatus for defect inspection of underwater surfaces of dams according to claim 3, characterized in that a plurality of groups of suction nozzles (152) are circumferentially distributed along the disc body (151), a plurality of suction nozzles (152) in each group being radially distributed along the disc body (151).

5. The device for detecting defects of the underwater surface of the dam as claimed in claim 4, wherein the number of the clamping grooves (18) is 4, and the clamping grooves are uniformly distributed on the outer side of the rotating portion (23), and the number of the mounting grooves is 4 and corresponds to the clamping grooves (18) one by one.

6. The device for detecting the defects of the underwater surface of the dam as claimed in any one of claims 3 to 5, wherein the connecting rod (16) is cylindrical, the driving ring (21) is composed of two semicircular arc pieces (210), one ends of the two arc pieces (210) are hinged with each other, the second magnet (19) is embedded in the inner side of the arc pieces (210), and the inner diameter of the arc pieces (210) is equal to the outer diameter of the connecting rod (16).

7. The apparatus for detecting defects on an underwater surface of a dam according to claim 6, wherein the connecting rod (16) is provided at an outer circumferential surface thereof with positioning grooves, and the arc piece (210) is provided at an inner side thereof with positioning protrusions (27) corresponding to the positioning grooves, the positioning grooves corresponding to the mounting grooves.

8. The device for detecting the defects of the underwater surface of the dam as claimed in claim 7, wherein two limit plates (20) are sleeved outside the connecting rod (16), and a space for installing the driving ring (21) is reserved between the two limit plates (20).

9. The device for detecting the defects of the underwater surface of the dam according to claim 1, wherein a storage box (2) is further arranged in the frame body (1), a tracer is arranged in the storage box (2), a check valve is arranged at the end part of the storage box (2), a piston (3) is arranged in the storage box (2) in a sliding manner, a push rod (5) is arranged on the end face of the piston (3), a second electric rod (8) is connected to the tail end of the push rod (5), and the second electric rod (8) is fixedly arranged in the frame body (1).

10. The device for detecting the defects of the underwater surface of the dam as claimed in claim 1, wherein the cradle head comprises a mechanical rotating cradle head (7), a rotating arm (6) capable of rotating vertically is arranged at the upper part of the mechanical rotating cradle head (7), and the detection equipment (4) is fixed at the top end of the rotating arm (6).

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