Boiler pressure vessel inner surface crack detection device

Abstract

The utility model relates to the field of detection, in particular to a boiler pressure vessel inner surface crack detection device which comprises a box body, a recovery assembly is arranged in the box body, the recovery assembly comprises a first rotating motor, the first rotating motor is fixedly connected to the top of the box body, and the transmission end of the first rotating motor is fixedly connected with a rotating shaft. According to the boiler pressure vessel inner surface crack detection device, a recovery assembly is added, and a concentric-square-shaped block rotates along an annular block due to the structure that half of the annular block is lower than more than half of the height, so that when the concentric-square-shaped block rotates to the higher side, an electrifying rod makes contact with the annular block for electrifying, that is, when the curved surface of a magnetic attraction block rotates to the outer side, the electrifying rod is electrified to generate magnetic force to attract magnetic powder; and when the magnetic powder is rotated to the inner side, power is cut off, the magnetic powder is sprinkled, the magnetic powder enters the collecting box through the inclined block and the collecting opening after being sprinkled, the magnetic powder can be recycled while the large-size boiler is detected, the workload of workers is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of testing, specifically a device for detecting cracks on the inner surface of a boiler pressure vessel. Background Technology

[0002] Detection of cracks on the inner surface of boilers and pressure vessels is crucial for ensuring the safe operation of equipment. Because boilers and pressure vessels operate in high-temperature and high-pressure environments for extended periods, they are prone to cracking, increasing the risk of equipment explosion and seriously threatening the lives of workers and the economic interests of enterprises. Magnetic particle testing, a non-destructive testing method, is generally used to detect cracks. By applying a magnetic force to the vessel and then spraying magnetic powder, a leakage magnetic field is generated at the crack, and the magnetic powder accumulates at the crack, allowing workers to clearly observe whether cracks have occurred on the inner surface.

[0003] Currently, when using boiler pressure vessel internal surface crack detection devices, especially when inspecting large-volume boilers, the recovery of magnetic powder after inspection wastes a lot of time and manpower, increasing the workload of staff. Furthermore, when inspecting multiple boilers, the detection efficiency is reduced. Utility Model Content

[0004] The purpose of this invention is to provide a device for detecting cracks on the inner surface of boiler pressure vessels, in order to solve the problems mentioned in the background art, such as the waste of a lot of time and manpower in recycling magnetic powder after testing large-volume boilers, which increases the workload of staff, and the reduced testing efficiency when testing multiple boilers. To achieve the above objectives, this utility model provides the following technical solution: a device for detecting cracks on the inner surface of a boiler pressure vessel, comprising a housing, the inside of which is equipped with a recovery assembly, the recovery assembly including a rotary motor, the rotary motor being fixedly connected to the top of the housing, a rotary shaft being fixedly connected to the transmission end of the rotary motor, a U-shaped block being fixedly connected inside the rotary shaft, a receiving rod being sleeved inside the U-shaped block, a current-carrying tube being sleeved inside the rotary shaft via a bearing, an annular block being fixedly connected to the top end of the current-carrying tube, a magnetic block being fixedly connected to the bottom of the rotary shaft, four inclined blocks being fixedly connected to one inner wall of the housing, a collection port being opened on the side of the housing near the inclined blocks, a collection box being fixedly connected to the side of the housing near the collection port, a spring-loaded valve being movably connected to one inner wall of one side of the collection box via a hinge, two fixing blocks being fixedly connected to one inner wall of one side of the collection box, a limit groove being opened on one side of the fixing block, a slider being movably connected inside the limit groove, and one side of the slider being connected to the spring-loaded valve via a rope. This type of boiler... The pressure vessel internal surface crack detection device, by adding a recovery component, uses a rotary motor to drive a magnetic block to rotate via a rotating shaft. Simultaneously, a U-shaped block and an energizing rod inside the rotating shaft also rotate. Because the energizing tube is connected to the rotating shaft via a bearing, the annular block at the top of the energizing tube does not rotate. The U-shaped block rotates along the annular block. Due to the structure of the annular block, which is half low and half high, the energizing rod contacts the annular block and energizes it when the U-shaped block rotates to the higher side. That is, when the curved surface of the magnetic block rotates to the outer side, it generates an electric force to attract magnetic powder; when it rotates to the inner side, the power is de-energized. Sprinkling magnetic powder enhances the convenience of the device. After being sprinkled, the magnetic powder enters the collection box through the tilting block and collection port. The hinge end of the rebound valve, containing a spiral spring, always remains closed. However, when the collection box faces the ground, the slider connected to the rebound valve slides down stably under the action of gravity, pulled by the fixed block and the limiting groove, to collect the magnetic powder. At other times, it remains closed, which improves the stability of the device. Magnetic powder can also be recovered simultaneously when testing large-volume boilers, reducing the workload of staff and improving work efficiency.

[0005] Further preferably, a bending assembly is provided on one side of the housing. The bending assembly includes a first robotic arm, which is movably connected to one side of the housing via a coupling. A first fixing plate is fixedly connected to the top of the housing. A first hydraulic rod is movably connected to one side of the first fixing plate via a coupling. A first pneumatic cylinder is fixedly connected to the other end of the first hydraulic rod, and the first pneumatic cylinder is movably connected to the top of the first robotic arm via a coupling. A second robotic arm is movably connected to the other side of the first robotic arm via a coupling. A second fixing plate is fixedly connected to the bottom of the first robotic arm. A second hydraulic rod is movably connected to one side of the second fixing plate via a coupling. A second pneumatic cylinder is fixedly connected to the other end of the second hydraulic rod. This boiler pressure vessel inner surface crack detection device, by adding a rotating assembly, allows the first robotic arm and the housing to bend via the first hydraulic rod and the first pneumatic cylinder, and the second robotic arm and the first robotic arm to rotate via the second hydraulic rod and the second pneumatic cylinder, forming a multi-angle secondary rotation. This allows for multi-angle adjustment for detection, which improves the flexibility and applicability of the device.

[0006] More preferably, a spraying assembly is provided on one side of the housing. The spraying assembly includes a storage box. A pressure rod is fixedly connected to one side of the storage box, and a connecting block is fixedly connected to the other end of the pressure rod. A second fixing block is movably connected to one side of the connecting block, and the second fixing block is fixedly connected to one side of the robotic arm. A protective cover is threaded to the top of the storage box. A connecting pipe is fixedly connected to one side of the storage box, and several fixing rings are sleeved on the side surface of the connecting pipe. A nozzle is fixedly connected to the other end of the connecting pipe. In this boiler pressure vessel internal surface crack detection device, by adding the spraying assembly, wet magnetic powder is added to the storage box and closed by the protective cover. One end of the pressure rod is connected to the connecting block, and the connecting block and the second fixing block are movably connected and can rotate. Since the second fixing block is connected to the second robotic arm and the storage box is connected to the first robotic arm, when the two arms are bent, the pressure rod compresses air into the storage box, and the wet magnetic powder is sprayed out from the nozzle through the connecting pipe, which helps to improve the coordination and energy efficiency of the device.

[0007] Further preferably, a magnetizing assembly is provided on one side of the housing. The magnetizing assembly includes a power supply, which is fixedly connected to the bottom of the housing. Two telescopic tubes are movably connected to one side of the power supply, and a magnetizing head is fixedly connected to the other end of each telescopic tube. A spring is fitted onto the side surface of the telescopic tube. This type of boiler pressure vessel inner surface crack detection device, by adding a magnetizing assembly, connects the magnetizing head to one end of the telescopic tube, and the spring fitted onto the telescopic tube allows the magnetizing head to extend and retract. This allows it to contact most boiler inner surfaces, which improves the applicability of the device. Furthermore, when the magnetizing head is not energized, the compression and contraction will not hinder the recovery assembly from recovering the material, which improves the coordination of the device.

[0008] More preferably, a rotating assembly is provided on one side of the housing. The rotating assembly includes a rotating column, which is fixedly connected to one side of the robotic arm. A rotating motor is fixedly connected to the other end of the rotating column. This boiler pressure vessel inner surface crack detection device, by adding the rotating assembly, allows the rotating motor to drive the rotating column to rotate, thereby driving all the components of the above assembly to rotate, which helps to increase the detection angle of the device and improve the flexibility of the device.

[0009] Further preferably, a lifting assembly is provided on one side of the housing. The lifting assembly includes a lifting plate, which is fixedly connected to the bottom of the rotary motor. A rotating groove is provided on the top of the lifting plate. A hydraulic rod is fixedly connected to the bottom of the lifting plate. A pneumatic cylinder is fixedly connected to the bottom end of the hydraulic rod. Telescopic columns are fixedly connected to the four corners of the bottom of the lifting plate. Two cameras are fixedly connected to the top of the housing. A counterweight is fixedly connected to the bottom of the pneumatic cylinder. A base is fixedly connected to the bottom of the counterweight. Universal wheels are fixedly connected to the four corners of the base. This boiler pressure vessel internal surface crack detection device, by adding a lifting assembly, allows the pneumatic cylinder to drive the hydraulic rod to rise and fall. The four telescopic columns stabilize the lifting process, which helps improve the stability of the device. Furthermore, the rotating groove on the lifting plate facilitates the rotation of the rotating columns, which helps improve the coordination of the device.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] In this invention, the device for detecting surface cracks in boiler pressure vessels incorporates a recycling component. A rotating motor drives a magnetic block to rotate via a rotating shaft. Simultaneously, a U-shaped block and an energizing rod inside the rotating shaft also rotate. Because the energizing tube is connected to the rotating shaft via a bearing, the annular block at the top of the energizing tube does not rotate. The U-shaped block rotates along the annular block. Due to the structure of the annular block, which is half low and half high, the energizing rod contacts the annular block and energizes it when the U-shaped block rotates to the higher side. That is, when the curved surface of the magnetic block rotates to the outer side, the energization generates magnetic force that attracts magnetic powder. The device's convenience is enhanced by de-energizing the magnetic powder upon reaching the inner side. After being sprinkled, the magnetic powder enters the collection box through the tilting block and collection port. The hinge end of the rebound valve, containing a spiral spring, always remains closed. However, when the collection box faces the ground, the slider connected to the rebound valve slides down stably under the action of gravity, pulled by the fixed block and the limiting groove, to collect the magnetic powder. At other times, the valve remains closed, which improves the device's stability. Magnetic powder can also be recovered simultaneously when inspecting large-volume boilers, reducing the workload of staff and improving work efficiency.

[0012] In this invention, the boiler pressure vessel inner surface crack detection device, by adding a rotating component, allows the first robotic arm and the housing to bend via a hydraulic rod and a pneumatic cylinder, and the second robotic arm and the first robotic arm to rotate via a hydraulic rod and a pneumatic cylinder, forming a multi-angle two-stage rotation. This allows for multi-angle adjustment for detection, which improves the flexibility and applicability of the device.

[0013] In this utility model, the boiler pressure vessel inner surface crack detection device adds a spraying component. Wet magnetic powder is added to the storage tank and closed by a protective cover. One end of the pressure rod is connected to a connecting block. The connecting block and the second fixed block are movably connected and can rotate. Since the second fixed block is connected to the second robotic arm and the storage tank is connected to the first robotic arm, when the two arms are bent, the pressure rod squeezes air into the storage tank, and the wet magnetic powder is sprayed out from the nozzle through the connecting pipe, which helps to improve the coordination and energy efficiency of the device. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention. Figure 1 ;

[0015] Figure 2 This is a schematic diagram of the overall three-dimensional structure of the present invention. Figure 2 ;

[0016] Figure 3 This is a schematic diagram of the overall three-dimensional structure of the present invention. Figure 3 ;

[0017] Figure 4 For this utility model Figure 1 Enlarged detail image of point A in the middle;

[0018] Figure 5 This is a schematic diagram of a partial three-dimensional structure of the present invention. Figure 1 ;

[0019] Figure 6 This is a schematic diagram of a partial three-dimensional structure of the present invention. Figure 2 ;

[0020] Figure 7 This is a schematic diagram of a partial three-dimensional structure of the present invention. Figure 3 .

[0021] In the diagram: 1. Box body; 2. Recycling component; 3. Bending component; 4. Spraying component; 5. Magnetizing component; 6. Camera; 7. Rotating component; 8. Lifting component; 9. Counterweight; 10. Base; 11. Casters; 201. Rotary motor one; 202. Rotating shaft; 203. U-shaped block; 204. Electric contact rod; 205. Power supply pipe; 206. Ring block; 207. Magnetic block; 208. Inclined block; 209. Collection port; 210. Collection box; 211. Rebound valve; 212. Fixing block one; 213. Limiting groove; 214. Slider; 301. Robotic arm one; 302. Fixing plate one; 303. Hydraulic rod one; 304. Pneumatic cylinder one; 305. Mechanical arm two; 306. Fixing plate two; 307. Hydraulic rod two; 308. Pneumatic cylinder two; 401. Storage box; 402. Pressure rod; 403. Connecting block; 404. Fixing block two; 405. Protective cover; 406. Connecting pipe; 407. Fixing ring; 408. Nozzle; 501. Power supply; 502. Magnetic head; 503. Telescopic tube; 504. Spring; 701. Rotating column; 702. Rotary motor two; 801. Lifting plate; 802. Rotating groove; 803. Hydraulic rod three; 804. Pneumatic cylinder three; 805. Telescopic column. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0023] Please see Figure 1 - Figure 7A device for detecting cracks on the inner surface of a boiler pressure vessel includes a housing 1. A recovery assembly 2 is installed inside the housing 1. The recovery assembly 2 includes a rotary motor 201, which is fixedly connected to the top of the housing 1. A rotary shaft 202 is fixedly connected to the transmission end of the rotary motor 201. A U-shaped block 203 is fixedly connected inside the rotary shaft 202. A current-connecting rod 204 is sleeved inside the U-shaped block 203. A current-carrying pipe 205 is sleeved inside the rotary shaft 202 via a bearing. An annular block 206 is fixedly connected to the top end of the current-carrying pipe 205. The bottom of the rotary shaft 202 is fixedly connected to... There is a magnetic block 207. Four inclined blocks 208 are fixedly connected to one side of the inner wall of the box body 1. A collection port 209 is opened on the side of the box body 1 near the inclined blocks 208. A collection box 210 is fixedly connected to the side of the box body 1 near the collection port 209. A spring valve 211 is movably connected to one side of the inner wall of the collection box 210 via a hinge. Two fixing blocks 212 are fixedly connected to one side of the inner wall of the collection box 210. A limit groove 213 is opened on one side of the fixing block 212. A slider 214 is movably connected inside the limit groove 213. One side of the slider 214 is connected to the spring valve 211 via a rope.

[0024] In this embodiment, as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a bending assembly 3 is provided on one side of the box body 1. The bending assembly 3 includes a robotic arm 301, which is movably connected to one side of the box body 1 via a coupling. A fixing plate 302 is fixedly connected to the top of the box body 1. A hydraulic rod 303 is movably connected to one side of the fixing plate 302 via a coupling. A pneumatic cylinder 304 is fixedly connected to the other end of the hydraulic rod 303. The pneumatic cylinder 304 is movably connected to the top of the robotic arm 301 via a coupling. A robotic arm 305 is movably connected to the other side of the robotic arm 301 via a coupling. A fixing plate 306 is fixedly connected to the bottom of the robotic arm 301. A hydraulic rod 307 is movably connected to one side of the fixing plate 306 via a coupling. A pneumatic cylinder 308 is fixedly connected to the other end of the hydraulic rod 307.

[0025] In this embodiment, as Figure 1 , Figure 2 and Figure 3As shown, a spraying assembly 4 is provided on one side of the housing 1. The spraying assembly 4 includes a storage tank 401. A pressure rod 402 is fixedly connected to one side of the storage tank 401. A connecting block 403 is fixedly connected to the other end of the pressure rod 402. A fixing block 404 is movably connected to one side of the connecting block 403. The fixing block 404 is fixedly connected to one side of the robotic arm 305. A protective cover 405 is threadedly connected to the top of the storage tank 401. A connecting pipe 406 is fixedly connected to one side of the storage tank 401. Several fixing rings 407 are sleeved on the side surface of the connecting pipe 406. A nozzle 408 is fixedly connected to the other end of the connecting pipe 406.

[0026] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, a magnetizing assembly 5 is provided on one side of the housing 1. The magnetizing assembly 5 includes a power supply 501, which is fixedly connected to the bottom of the housing 1. Two telescopic tubes 503 are movably connected to one side of the power supply 501. The other end of the telescopic tube 503 is fixedly connected to a magnetizing head 502. A spring 504 is sleeved on the side surface of the telescopic tube 503.

[0027] In this embodiment, as Figure 1 and Figure 2 As shown, a rotating assembly 7 is provided on one side of the housing 1. The rotating assembly 7 includes a rotating column 701, which is fixedly connected to one side of the robotic arm 305. The other end of the rotating column 701 is fixedly connected to a rotating motor 702.

[0028] In this embodiment, as Figure 1 and Figure 2 As shown, a lifting assembly 8 is provided on one side of the housing 1. The lifting assembly 8 includes a lifting plate 801, which is fixedly connected to the bottom of the rotary motor 702. A rotating groove 802 is provided on the top of the lifting plate 801. A hydraulic rod 803 is fixedly connected to the bottom of the lifting plate 801. A pneumatic cylinder 804 is fixedly connected to the bottom end of the hydraulic rod 803. Telescopic columns 805 are fixedly connected to the four corners of the bottom of the lifting plate 801. Two cameras 6 are fixedly connected to the top of the housing 1. A counterweight 9 is fixedly connected to the bottom of the pneumatic cylinder 804. A base 10 is fixedly connected to the bottom of the counterweight 9. Universal wheels 11 are fixedly connected to the four corners of the base 10.

[0029] The method of use and advantages of this utility model: The working process of this boiler pressure vessel inner surface crack detection device is as follows:

[0030] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the rotary motor 201 drives the magnetic block 207 to rotate via the rotating shaft 202. Simultaneously, the U-shaped block 203 and the receiving rod 204 inside the rotating shaft 202 also rotate. Because the energizing tube 205 is connected to the rotating shaft 202 via a bearing, the annular block 206 at the top of the energizing tube 205 does not rotate. The U-shaped block 203 rotates along the annular block 206. Due to the structure of the annular block 206, which is half low and half high, when the U-shaped block 203 rotates to its highest position… When the magnetic block 207 rotates to the outer side, the electric rod 204 contacts the annular block 206 to conduct electricity. This generates a magnetic force that attracts magnetic powder when the curved surface of the magnetic block 207 rotates to the outer side. When it rotates to the inner side, the electricity is cut off, and the magnetic powder is scattered. After being scattered, the magnetic powder enters the collection box 210 through the inclined block 208 and the collection port 209. The hinge end of the spring valve 211, containing a vortex-shaped elastic rod, always remains closed. However, when the collection box 210 faces the ground, the slider 214 connected to the spring valve 211, under the action of gravity, will cause the slider to... 214, under the action of fixed block 212 and limiting groove 213, slides down stably, pulling back valve 211 to collect magnetic powder; otherwise, it is closed. Robotic arm 301 is hinged to box 1 via hydraulic rod 303 and pneumatic cylinder 304, allowing it to bend. Robotic arm 305 is hinged to robotic arm 301 via hydraulic rod 307 and pneumatic cylinder 308, allowing it to rotate in a multi-angle, two-stage rotation, enabling multi-angle detection. Storage box 401 contains... The addition of wet magnetic powder is achieved by closing the protective cover 405. One end of the pressure rod 402 is connected to the connecting block 403. The connecting block 403 and the second fixed block 404 are movably connected and can rotate. Since the second fixed block 404 is connected to the second robotic arm 305 and the storage box 401 is connected to the first robotic arm 301, when the two arms are bent, the pressure rod 402 compresses air into the storage box 401. The wet magnetic powder is sprayed out from the nozzle 408 through the connecting pipe 406. Thus, the device can complete the recovery of magnetic powder.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A device for detecting cracks on the inner surface of a boiler pressure vessel, comprising a housing (1), characterized in that: The box (1) is equipped with a recycling component (2), which includes a rotary motor (201) fixedly connected to the top of the box (1). A rotating shaft (202) is fixedly connected to the transmission end of the rotary motor (201). A U-shaped block (203) is fixedly connected inside the rotating shaft (202). A receiving rod (204) is sleeved inside the U-shaped block (203). A power-conducting tube (205) is sleeved inside the rotating shaft (202) via a bearing. An annular block (206) is fixedly connected to the top of the power-conducting tube (205). A magnetic block (207) is fixedly connected to the bottom of the rotating shaft (202). Four inclined blocks (208) are fixedly connected to one side of the inner wall of the box (1). A collection port (209) is opened on the side of the box (1) near the inclined blocks (208). A collection box (210) is fixedly connected to the side of the box (1) near the collection port (209). A spring valve (211) is movably connected to one side of the inner wall of the collection box (210) via a hinge. Two fixing blocks (212) are fixedly connected to one side of the inner wall of the collection box (210). A limiting groove (213) is opened on one side of the fixing block (212). A slider (214) is movably connected inside the limiting groove (213), and one side of the slider (214) is connected to the spring valve (211) via a rope.

2. The device for detecting cracks on the inner surface of a boiler pressure vessel according to claim 1, characterized in that: A bending assembly (3) is provided on one side of the box body (1). The bending assembly (3) includes a robotic arm (301), which is movably connected to one side of the box body (1) via a coupling. A fixing plate (302) is fixedly connected to the top of the box body (1). A hydraulic rod (303) is movably connected to one side of the fixing plate (302) via a coupling. A pneumatic cylinder (304) is fixedly connected to the other end of the hydraulic rod (303). Furthermore, pneumatic cylinder one (304) is movably connected to the top of robotic arm one (301) via a coupling. Robotic arm two (305) is movably connected to the other side of robotic arm one (301) via a coupling. Fixed plate two (306) is fixedly connected to the bottom of robotic arm one (301). Hydraulic rod two (307) is movably connected to one side of fixed plate two (306) via a coupling. Pneumatic cylinder two (308) is fixedly connected to the other end of hydraulic rod two (307).

3. The device for detecting cracks on the inner surface of a boiler pressure vessel according to claim 2, characterized in that: A spraying assembly (4) is provided on one side of the housing (1). The spraying assembly (4) includes a storage box (401). A pressure rod (402) is fixedly connected to one side of the storage box (401). A connecting block (403) is fixedly connected to the other end of the pressure rod (402). A fixing block (404) is movably connected to one side of the connecting block (403), and the fixing block (404) is fixedly connected to one side of the robotic arm (305). A protective cover (405) is threadedly connected to the top of the storage box (401). A connecting pipe (406) is fixedly connected to one side of the storage box (401). Several fixing rings (407) are sleeved on the side surface of the connecting pipe (406). A nozzle (408) is fixedly connected to the other end of the connecting pipe (406).

4. The device for detecting cracks on the inner surface of a boiler pressure vessel according to claim 1, characterized in that: A magnetizing assembly (5) is provided on one side of the housing (1). The magnetizing assembly (5) includes a power supply (501). The power supply (501) is fixedly connected to the bottom of the housing (1). Two telescopic tubes (503) are movably connected to one side of the power supply (501). The other end of the telescopic tube (503) is fixedly connected to a magnetizing head (502). A spring (504) is sleeved on the side surface of the telescopic tube (503).

5. The device for detecting cracks on the inner surface of a boiler pressure vessel according to claim 2, characterized in that: A rotating assembly (7) is provided on one side of the housing (1). The rotating assembly (7) includes a rotating column (701), which is fixedly connected to one side of the robotic arm (305). The other end of the rotating column (701) is fixedly connected to a rotating motor (702).

6. The device for detecting cracks on the inner surface of a boiler pressure vessel according to claim 5, characterized in that: A lifting assembly (8) is provided on one side of the box (1). The lifting assembly (8) includes a lifting plate (801). The lifting plate (801) is fixedly connected to the bottom of the rotary motor (702). A rotating groove (802) is provided on the top of the lifting plate (801). A hydraulic rod (803) is fixedly connected to the bottom of the lifting plate (801). A pneumatic cylinder (804) is fixedly connected to the bottom end of the hydraulic rod (803). Telescopic columns (805) are fixedly connected to the four corners of the bottom of the lifting plate (801). Two cameras (6) are fixedly connected to the top of the box (1). A counterweight (9) is fixedly connected to the bottom of the pneumatic cylinder (804). A base (10) is fixedly connected to the bottom of the counterweight (9). A caster wheel (11) is fixedly connected to the four corners of the base (10).

Images