A device and method for detecting cracks on the inner surface of a boiler pressure vessel

Abstract

The present invention discloses a device and method for detecting cracks on the inner surface of a boiler pressure vessel, and relates to the field of crack detection. The device comprises a drive unit, a support unit, and a magnetic powder detection unit. The device and method for detecting cracks on the inner surface of a boiler pressure vessel fix the magnetic powder detection unit with the support unit, and drive a cylindrical member to move spirally with the drive unit, thereby performing annular continuous detection on the inner wall of the cylindrical member. Simultaneously, during the movement of the cylindrical member, a magnetic powder coating member is automatically driven to coat the inner wall of the cylindrical member with magnetic powder, and a scraping roller automatically scrapes and recovers the magnetic powder from the area after the detection. This makes the magnetic powder coating process more stable and uniform, the equipment more stable during the detection process, and the magnetic powder recovery rate higher after the detection. The device also has a simple design, requires less power source, and reduces equipment and control costs.

Description

Technical Field

[0001] The present invention relates to the technical field of crack detection, in particular to a device and method for detecting cracks on the inner surface of a boiler pressure vessel. Background Art

[0002] Boiler pressure vessels usually refer to boiler pressure tanks. During processing, the entire steel plate is first bent into a cylindrical shape, and then the joints are welded. Then, the end covers at both ends are made and welded to the cylindrical structure for assembly. During the bending process of the cylindrical structure, due to the internal stress of the metal material and the bending process, some products will have cracks. It is necessary to analyze the cracks to determine whether they are qualified.

[0003] During the inspection process, a magnetic particle detector is usually used for inspection. Magnetic powder is applied to the inspection area, and then the area is magnetized using the magnetic particle detector. The magnetic powder is arranged in a regular pattern under the action of the magnetic force. If there are cracks, they will accumulate at the cracks, thereby achieving non-destructive testing.

[0004] The existing patent publication number is CN115932033B, which discloses a boiler pressure vessel inner surface crack detection device, including a base, a container detection unit, a detection support unit, a container support unit and a controller. The container support unit is installed laterally on the base and is used to support the pressure vessel to be detected. The controller can control the container support unit to drive the pressure vessel to be detected to rotate at a constant speed. The present invention has a unique structure and ingenious design. It can not only effectively solve the problems of the existing boiler pressure vessel inner surface crack detection operation being difficult and time-consuming, but also effectively solve the problems of low accuracy of detection results and harm to the health of detection personnel during the detection process.

[0005] However, the boiler pressure vessel inner surface crack detection device proposed in the above patent has the following disadvantages in practical application:

[0006] First, the device uses a driver to rotate the container and another driver to linearly move the container detection unit, thereby achieving complete inspection of the container's inner wall. However, in actual use, both the container and the container detection unit are in a moving state, resulting in significant overall shaking, which can easily cause the magnetic powder to fall off due to vibration, affecting the inspection effect.

[0007] Second, the device uses spraying and suction to attach magnetic powder to the surface of the container. During the spraying process, a large airflow is generated, causing the magnetic powder to be dispersed. During the suction process, if the airflow is small, the magnetic powder cannot be recovered. If the airflow is large, it will affect the shedding of magnetic powder in the undetected area. At the same time, the entire device is facing downward during detection, which makes the recovery of magnetic powder more difficult.

[0008] In order to solve the above problems, a device and method for detecting cracks on the inner surface of a boiler pressure vessel are provided. Summary of the Invention

[0009] In response to the shortcomings of the existing technology, the present invention provides a boiler pressure vessel inner surface crack detection device and method, which solves the problems in the existing technology of pressure vessel inner surface crack detection, such as unreasonable design leading to inaccurate detection results and difficulty in magnetic powder application and recovery.

[0010] To achieve the above objectives, the present invention is implemented through the following technical solutions: A device for detecting cracks on the inner surface of a boiler pressure vessel, comprising: a driving unit including two sets of support rails;

[0011] a rotary drive member for driving the container to rotate while simultaneously moving linearly along the two sets of support rails;

[0012] a support unit, which is arranged at one end of the support rail;

[0013] A magnetic particle detection unit is mounted on the end of the support unit, the magnetic particle detection unit comprising a U-shaped integrated magnetizer, with a magnetized area formed between the two ends thereof on the inner wall of the pressure vessel;

[0014] A magnetic powder coating member is installed below the U-shaped integrated magnetizer, with the upper end of the magnetic powder coating member in contact with one side of the magnetized area, for coating magnetic powder;

[0015] A detection probe is installed on one side of the U-shaped integrated magnetizer and is used to detect the other side of the magnetized area;

[0016] The scraper roller is arranged on the side of the detection probe away from the U-shaped integrated magnetizer, and performs magnetic powder cleaning on the surface of the pressure vessel leaving the magnetization area.

[0017] Preferably, the driving unit further comprises a bottom plate, the two groups of support rails are fixedly arranged on both sides of the bottom plate, and the support unit is mounted on the bottom plate;

[0018] The running ball is arranged to rotate on the top of the support track;

[0019] The driving screw is fixedly arranged above the base plate, and the rotary driving member moves along the driving screw.

[0020] Preferably, the rotary drive member includes a traveling seat, which is movably sleeved on the outer surface of the driving screw;

[0021] The driving gear is rotatably mounted on the top of the traveling seat;

[0022] The travel motor is fixedly arranged on one side of the travel base, and its output end is fixedly connected to the driving gear;

[0023] The inner rotating roller is rotatably arranged on the top of the other side of the traveling seat and is fixedly connected to the driving gear;

[0024] Two sets of passive gear rings are arranged on both sides of the bottom of the traveling seat and are respectively engaged with the driving gears;

[0025] Two groups of outer rollers are rotatably arranged on both sides below the inner roller and are fixedly connected to the two groups of passive gear rings respectively. The outer rollers are threadedly connected to the outer surface of the driving screw.

[0026] Preferably, the support unit includes a support base, which is fixedly mounted on the upper surface of the base plate;

[0027] A lifting arm is slidably arranged on one side of the support base, and the magnetic particle detection unit is fixedly arranged at the end of the lifting arm;

[0028] A lifting drive motor is fixedly mounted on the top of the support base and is in transmission connection with the lifting arm;

[0029] An auxiliary support frame is rotatably arranged at the bottom of the front end of the lifting arm;

[0030] The turning hydraulic cylinder has two ends hinged to the outer surfaces of the lifting arm and the auxiliary support frame respectively;

[0031] The supporting ball is rotatably arranged at the bottom end of the auxiliary support frame.

[0032] Preferably, a slider is fixedly provided at the end of the lifting arm, a side pull connecting rod is fixedly welded between the top end of the slider and the lifting arm, a lifting screw is rotatably provided in the support seat, the slider is threadedly connected to the outer surface of the lifting screw, the top end of the lifting screw is fixedly connected to the lifting drive motor, a positioning strip is fixedly provided on the inner wall of the support seat, a slide groove is provided on the side of the slider, and the positioning strip is provided through the slide groove.

[0033] Preferably, the magnetic powder detection unit further comprises a detection box, which is fixedly connected to the end of the lifting arm, and the U-shaped integrated magnetizer is fixedly arranged in the middle of the detection box;

[0034] A power contact rubber roller is rotatably disposed inside the detection box, with one side of the power contact rubber roller extending upward to the outside of the detection box, and the power contact rubber roller is transmission-connected to the scraper roller;

[0035] A magnetic powder hopper is fixedly arranged in the detection box and is used to add magnetic powder to the magnetic powder coating part;

[0036] The receiving hopper is fixedly arranged below the scraping roller, and its bottom end is located above the end of the magnetic powder smearing piece, and is used for magnetic powder recovery.

[0037] Preferably, the magnetic powder coating member includes two sets of drive chains, the front ends of which are bent upward and extended into an L shape;

[0038] A flexible magnetic tape is fixedly disposed between the two sets of drive chains;

[0039] an elastic support member, which is arranged inside the upwardly bent portion of the flexible magnetic tape;

[0040] A passive roller, which is rotatably connected to the top of the detection box;

[0041] A driving roller is rotatably arranged at the bottom of the detection box;

[0042] The two sets of drive chains are installed between the passive roller and the driving roller.

[0043] Preferably, the magnetic powder silo is located below the front end of the flexible magnetic tape, and a powder transfer roller is rotatably arranged inside the magnetic powder silo. A second transmission chain is installed between the powder transfer roller and the drive roller, and transmission gears are installed at both ends of the power contact rubber roller and the scraper roller. The two sets of transmission gears are meshed with each other, and a first transmission chain is installed between the scraper roller and the drive roller.

[0044] Preferably, a partition plate is provided between the upper end of the flexible tape and the detection probe, ultraviolet lamps are provided on both sides of the detection probe, a transparent cover is provided on the top of the detection probe and the ultraviolet lamp, and one side of the top of the transparent cover is inclined toward the receiving hopper.

[0045] Preferably, a method for detecting cracks on the inner surface of a boiler pressure vessel comprises the following steps:

[0046] Step 1: Loading: Push the cylindrical member inward along the support track so that the front end of the cylindrical member is inserted between the inner rotating roller and the two sets of outer rotating rollers;

[0047] Step 2: The magnetic particle detection unit is in place, and the lifting drive motor is started to move the detection box upward and contact the inner top of the cylindrical member. The turning hydraulic cylinder is started to turn the bottom end of the auxiliary support downward, and the supporting ball contacts the inner bottom of the cylindrical member;

[0048] Step 3: Continuous detection: Start the travel motor and the U-shaped integrated magnetizer to make the cylindrical part move spirally and the power contact rubber roller rotate passively, so that the magnetic powder coating part automatically coats the magnetic powder, the powder transfer roller coats the magnetic powder on the magnetic powder coating part, the detection probe detects the coating area, and the scraper roller cleans and recovers the magnetic powder after detection to the magnetic powder coating part.

[0049] The present invention discloses a device and method for detecting cracks on the inner surface of a boiler pressure vessel, which have the following beneficial effects:

[0050] 1. This boiler pressure vessel inner surface crack detection device passively drives the magnetic powder coating member inside the magnetic powder detection unit to smear magnetic powder on the inner wall of the cylindrical member as the cylindrical member moves spirally. At the same time, the scraper roller automatically scrapes and recovers the magnetic powder in the area after the inspection. The recovered magnetic powder is immediately returned to the magnetic powder coating member for recycling. No additional wind drive is required. The magnetic powder coating and removal process is more stable and reliable. The magnetic powder loading and unloading process will not affect the inspection area, making the inspection results more accurate.

[0051] 2. The boiler pressure vessel inner surface crack detection device starts the travel motor, so that the travel motor drives the driving gear to rotate counterclockwise, and the driving gear drives the inner roller to rotate counterclockwise. At the same time, the driving gear drives the two sets of passive gear rings to rotate clockwise, so that the two sets of outer rollers rotate clockwise. At this time, under the action of the inner and outer rollers, the cylindrical member rotates counterclockwise. At the same time, as the two sets of outer rollers rotate, it moves along the driving screw and drives the cylindrical member to move along the traveling ball on the support track through the traveling seat toward the end away from the support seat. At this time, the cylindrical member moves in a spiral. During the process, the detection box always remains stationary, thereby maintaining stability during the detection process and improving detection accuracy.

[0052] 3. The boiler pressure vessel inner surface crack detection device is provided with a magnetic powder smearing part. The scraper roller drives the driving roller to rotate clockwise, and the driving roller drives the powder transfer roller to rotate clockwise, so that the flexible magnetic tape automatically circulates and moves. The powder transfer roller automatically dips the magnetic powder in the magnetic powder silo onto the surface of the flexible magnetic tape, and utilizes the magnetic adsorption of the flexible magnetic tape. Then, when the flexible magnetic tape moves upward, the excess magnetic powder will fall back into the magnetic powder silo under the action of gravity. The flexible magnetic tape enters one side of the U-shaped integrated magnetizer. The U-shaped integrated magnetizer forms a magnetized area on the surface of the cylindrical member. By adjusting the magnetic force so that its magnetism is greater than that of the flexible magnetic tape, under the action of the magnetic force, the magnetic powder is automatically transferred from the flexible magnetic tape to the inner wall of the cylindrical member to realize automatic loading, and the smearing method is adopted to effectively prevent the magnetic powder from falling during loading.

[0053] 4. The boiler pressure vessel inner surface crack detection device starts the lifting drive motor to move the detection box upward so that its top end contacts the inner top of the cylindrical member, and then starts the flip hydraulic cylinder to drive the bottom end of the auxiliary support frame to flip downward, and finally makes the supporting ball contact the inner bottom of the cylindrical member, thereby ensuring that the upper end of the detection box can fit closely with the inner wall of the cylindrical member, so that the detection box can fit closely with the inner wall of the cylindrical member, thereby improving the accuracy of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0055] Figure 1 It is a schematic diagram of the overall outer surface structure of the present invention.

[0056] Figure 2 It is a sectional view of the overall side structure of the present invention.

[0057] Figure 3 This is a schematic diagram of the support unit structure of the present invention.

[0058] Figure 4 Schematic diagram of the drive unit structure of the present invention.

[0059] Figure 5 This is a structural diagram of the rotary drive component of the present invention.

[0060] Figure 6 It is a schematic diagram of the outer surface structure of the magnetic powder detection unit of the present invention.

[0061] Figure 7 This is a side structural sectional view of the detection box of the present invention.

[0062] Figure 8 This is a cross-sectional view of the internal structure of the detection box of the present invention.

[0063] Figure 9 This is a structural schematic diagram of the magnetic powder coating component of the present invention.

[0064] In the figure: 1, drive unit; 11, base plate; 12, support rail; 13, running ball; 14, rotary drive member; 15, drive screw;

[0065] 141. Traveling seat; 142. Driving gear; 143. Traveling motor; 144. Inner roller; 145. Passive gear ring; 146. Outer roller;

[0066] 2. Support unit; 21. Support seat; 22. Slider; 23. Lifting arm; 24. Lifting drive motor; 25. Positioning bar; 26. Slide; 27. Side pull link; 28. Flip hydraulic cylinder; 29. ​​Auxiliary support; 210. Support ball; 211. Lifting screw;

[0067] 3. Magnetic powder detection unit; 31. Detection box; 32. U-shaped integrated magnetizer; 33. Magnetic powder applicator; 34. Scraper roller; 35. Power contact rubber roller; 36. Detection probe; 37. Ultraviolet lamp; 38. Magnetic powder silo; 382. Powder transfer roller; 39. Separator; 310. Hopper; 311. Transparent cover; 312. Transmission gear; 313. First transmission chain; 314. Second transmission chain;

[0068] 331. Drive chain; 332. Flexible magnetic tape; 333. Elastic support member; 334. Passive roller; 335. Drive roller. DETAILED DESCRIPTION

[0069] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0070] The embodiments of the present application provide a boiler pressure vessel inner surface crack detection device and method, thereby solving the problems in the prior art of pressure vessel inner surface crack detection, such as inaccurate detection results due to unreasonable design and difficulty in magnetic powder application and recovery.

[0071] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0072] The embodiment of the present invention discloses a device and method for detecting cracks on the inner surface of a boiler pressure vessel.

[0073] According to the attached Figure 1-9 As shown, it includes a driving unit 1, a supporting unit 2 and a magnetic powder detection unit 3. The driving unit 1 includes a base plate 11, two groups of supporting rails 12, walking balls 13, a rotating driving member 14 and a driving screw 15. The two groups of supporting rails 12 are fixedly arranged on both sides of the base plate 11, and the supporting unit 2 is installed on the base plate 11 and is located at one end of the supporting rails 12; the magnetic powder detection unit 3 is installed at the end of the supporting unit 2, the rotating driving member 14 is used to drive the container to rotate and move linearly along the two groups of supporting rails 12 at the same time, and the walking balls 13 are rotatably arranged on the top of the support rails 12; the driving screw 15 is fixedly arranged above the base plate 11, and the rotating driving member 14 moves along the driving screw 15.

[0074] The rotating drive component 14 includes a traveling seat 141, a driving gear 142, a traveling motor 143, an inner rotating roller 144, two sets of passive gear rings 145 and two sets of outer rotating rollers 146. The traveling seat 141 is movably sleeved on the outer surface of the driving screw 15; the driving gear 142 is rotatably arranged on the top of the traveling seat 141; the traveling motor 143 is fixedly arranged on one side of the traveling seat 141, and its output end is fixedly connected to the driving gear 142; the inner rotating roller 144 is rotatably arranged on the top of the other side of the traveling seat 141, and is fixedly connected to the driving gear 142; the two sets of passive gear rings 145 are rotatably arranged on both sides of the bottom of the traveling seat 141, and are respectively meshed with the driving gear 142; the two sets of outer rotating rollers 146 are rotatably arranged on both sides below the inner rotating roller 144, and are respectively fixedly connected to the two sets of passive gear rings 145, and the outer rotating roller 146 is threadedly connected to the outer surface of the driving screw 15.

[0075] The magnetic powder detection unit 3 includes a U-shaped integrated magnetizer 32, a magnetic powder smearing member 33, a scraper roller 34 and a detection probe 36. A magnetized area is formed on the inner wall of the pressure vessel between the two ends of the U-shaped integrated magnetizer 32; the magnetic powder smearing member 33 is installed below the U-shaped integrated magnetizer 32, and the upper end of the magnetic powder smearing member 33 is in contact with one side of the magnetized area for smearing magnetic powder; the detection probe 36 is installed on one side of the U-shaped integrated magnetizer 32 for detecting the other side of the magnetized area; the scraper roller 34 is arranged on the side of the detection probe 36 away from the U-shaped integrated magnetizer 32 to perform magnetic powder cleaning on the surface of the pressure vessel leaving the magnetized area.

[0076] The support unit 2 includes a support base 21, a lifting arm 23, a lifting drive motor 24, a flip hydraulic cylinder 28, an auxiliary support frame 29 and a support ball 210. The support base 21 is fixedly installed on the upper surface of the base plate 11; the lifting arm 23 is slidably arranged on one side of the support base 21, and the magnetic particle detection unit 3 is fixedly arranged at the end of the lifting arm 23; the lifting drive motor 24 is fixedly arranged on the top of the support base 21, and is transmission-connected to the lifting arm 23; the auxiliary support frame 29 is rotatably arranged at the bottom front end of the lifting arm 23; the two ends of the flip hydraulic cylinder 28 are respectively hinged to the outer surfaces of the lifting arm 23 and the auxiliary support frame 29; the support ball 210 is rotatably arranged at the bottom end of the auxiliary support frame 29.

[0077] A slider 22 is fixedly provided at the end of the lifting arm 23, and a side pull link 27 is fixedly welded between the top of the slider 22 and the lifting arm 23. A lifting screw rod 211 is rotatably provided in the support seat 21, and the slider 22 is threadedly connected to the outer surface of the lifting screw rod 211. The top of the lifting screw rod 211 is fixedly connected to the lifting drive motor 24. A positioning bar 25 is fixedly provided on the inner wall of the support seat 21, and a slide groove 26 is opened on the side of the slider 22. The positioning bar 25 is set through the slide groove 26.

[0078] The magnetic powder detection unit 3 also includes a detection box 31, a power contact rubber roller 35, a magnetic powder silo 38 and a receiving hopper 310. The detection box 31 is fixedly connected to the end of the lifting arm 23, and the U-shaped integrated magnetizer 32 is fixedly set in the middle of the detection box 31; the power contact rubber roller 35 is rotatably set inside the detection box 31, and one side of it extends upward to the outside of the detection box 31, and the power contact rubber roller 35 is transmission-connected to the scraper roller 34; the magnetic powder silo 38 is fixedly set in the detection box 31, and is used to add magnetic powder to the magnetic powder coating part 33. The receiving hopper 310 is fixedly set below the scraper roller 34, and its bottom end is located above the end of the magnetic powder coating part 33 for magnetic powder recovery.

[0079] The magnetic powder coating part 33 includes two sets of drive chains 331, a flexible magnetic tape 332, an elastic support member 333, a passive roller 334 and a driving roller 335. The front ends of the two sets of drive chains 331 are bent upward and extended into an L shape; the flexible magnetic tape 332 is fixedly arranged between the two sets of drive chains 331; the elastic support member 333 is arranged on the inner side of the upward bent part of the flexible magnetic tape 332; the passive roller 334 is rotatably connected to the top of the detection box 31; the driving roller 335 is rotatably arranged at the bottom of the detection box 31; the two sets of drive chains 331 are installed between the passive roller 334 and the driving roller 335.

[0080] The magnetic powder silo 38 is located below the front end of the flexible magnetic tape 332. A powder transfer roller 382 is provided for rotation inside the magnetic powder silo 38. A second transmission chain 314 is installed between the powder transfer roller 382 and the driving roller 335. Transmission gears 312 are installed at both ends of the power contact rubber roller 35 and the scraper roller 34. The two sets of transmission gears 312 are meshed with each other. A first transmission chain 313 is installed between the scraper roller 34 and the driving roller 335. A partition plate 39 is provided between the upper end of the flexible magnetic tape 332 and the detection probe 36. Ultraviolet lamps 37 are provided on both sides of the detection probe 36. A transparent cover 311 is provided on the top of the detection probe 36 and the ultraviolet lamp 37. The top side of the transparent cover 311 is inclined toward the receiving hopper 310.

[0081] Working principle: When the device is in use, the cylindrical member is pushed inward along the support rail 12 so that the front end of the cylindrical member is inserted between the inner rotating roller 144 and the two sets of outer rotating rollers 146. At this time, the lifting drive motor 24 is started to drive the lifting screw 211 to rotate, so that the slider 22 slides upward along the slide groove 26, so that the top end of the detection box 31 contacts the inner top of the cylindrical member. Then, the lifting drive motor 24 is turned off and the flip hydraulic cylinder 28 is started to drive the bottom end of the auxiliary support frame 29 to flip downward, and finally the support ball 210 contacts the inner bottom of the cylindrical member, thereby ensuring that the upper end of the detection box 31 can fit the inner wall of the cylindrical member.

[0082] At this time, the travel motor 143 is started, so that the travel motor 143 drives the driving gear 142 to rotate counterclockwise, and the driving gear 142 drives the inner roller 144 to rotate counterclockwise. At the same time, the driving gear 142 drives the two sets of passive gear rings 145 to rotate clockwise, so that the two sets of outer rollers 146 rotate clockwise. At this time, under the action of the inner roller 144 and the outer roller 146, the cylindrical member rotates counterclockwise. At the same time, as the two sets of outer rollers 146 rotate, it moves along the driving screw 15, and drives the cylindrical member through the travel seat 141 to move along the travel ball 13 on the support rail 12 toward the end away from the support seat 21. At this time, the cylindrical member moves in a spiral manner;

[0083] During the above process, the detection box 31 always remains stationary. As the cylindrical member moves spirally, the inner wall of the cylindrical member contacts the power contact rubber roller 35 and drives the power contact rubber roller 35 to rotate counterclockwise. At this time, the power contact rubber roller 35 drives the scraper roller 34 to rotate clockwise through two sets of transmission gears 312. The scraper roller 34 drives the driving roller 335 to rotate clockwise through the first transmission chain 313. The driving roller 335 drives the powder transfer roller 382 to rotate clockwise through the second transmission chain 314, thereby realizing that during the rotation of the cylindrical member, the flexible magnetic tape 332 automatically circulates and moves. The part of the top of the flexible magnetic tape 332 that contacts the cylindrical member is opposite to the moving direction of the cylindrical member, so that when the flexible magnetic tape 332 moves, the powder transfer roller 382 automatically dips the magnetic powder in the magnetic powder bin 38 into the flexible magnetic tape 33 2 surface, using the magnetic adsorption of the flexible tape 332, and then when the flexible tape 332 moves up, the excess magnetic powder will fall back to the inside of the magnetic powder silo 38 under the action of gravity, and then the flexible tape 332 drives the magnetic powder to move up and enter one side of the U-shaped integrated magnetizer 32. At this time, under the action of the U-shaped integrated magnetizer 32, a magnetized area is formed on the surface of the cylindrical member. By adjusting the magnetic force, its magnetism is greater than the magnetic force of the flexible tape 332. At this time, under the action of the magnetic force, the magnetic powder is automatically transferred from the flexible tape 332 to the inner wall of the cylindrical member, and then the cylindrical member drives the magnetic powder to move to the partition plate 39 again. At this time, under the action of the magnetic force, the magnetic powder is arranged in order. Under the irradiation of the ultraviolet lamp 37, the detection probe 36 takes a picture of the magnetic powder state, and the crack situation in the area is judged according to the picture;

[0084] After the flexible magnetic tape 332 completes the transmission of the magnetic powder, it returns downward to the position below the receiving hopper 310. At the same time, as the cylindrical member continues to rotate, the magnetic powder on the cylindrical member leaves the magnetized area and contacts the scraper roller 34. The rotation direction of the scraper roller 34 is opposite to the rotation direction of the inner wall of the cylindrical member, thereby scraping off the magnetic powder on the inner wall, causing the magnetic powder to fall into the receiving hopper 310 and then fall from the bottom of the receiving hopper 310 onto the flexible magnetic tape 332, completing the magnetic powder recovery and recycling. Some of the magnetic powder that falls in the magnetized area will fall on the transparent cover 311 and quickly slide to one side into the inside of the receiving hopper 310.

[0085] The entire device relies solely on the travel motor 143 as a power component. Through the cooperation of the travel motor 143 and the rotating drive component 14, the cylindrical component moves in a spiral shape along the support rail 12. During this process, the magnetic powder detection unit 3 always remains stationary and is more stable. At the same time, as the cylindrical component moves in a spiral shape, the magnetic powder smearing component 33 inside the magnetic powder detection unit 3 is passively driven to smear magnetic powder onto the inner wall of the cylindrical component. At the same time, the scraper roller 34 automatically scrapes and recycles the magnetic powder in the area after the inspection is completed. The recovered magnetic powder immediately enters the magnetic powder smearing component 33 for recycling. There is no need to use additional wind drive. The magnetic powder smearing and cleaning process is more stable and reliable, and the magnetic powder loading and unloading process will not affect the inspection area, making the inspection result more accurate.

[0086] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention 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, characterized in that: include: A drive unit (1) comprising: two sets of support rails (12); a rotary drive member (14) for driving the pressure vessel to rotate and simultaneously move linearly along the two sets of support rails (12); A support unit (2) is provided at one end of the support track (12); A magnetic powder detection unit (3) is mounted on an end portion of a support unit (2), wherein the support unit (2) includes a lifting arm (23), and the magnetic powder detection unit (3) is fixedly arranged on the end portion of the lifting arm (23). The magnetic powder detection unit (3) includes: A U-shaped integrated magnetizer (32) with a magnetized area formed between its two ends on the inner wall of the pressure vessel; A magnetic powder smearing member (33) is installed below the U-shaped integrated magnetizer (32), and the upper end of the magnetic powder smearing member (33) is in contact with one side of the magnetized area, and is used for smearing magnetic powder; A detection probe (36) is installed on one side of the U-shaped integrated magnetizer (32) and is used to detect the other side of the magnetized area; a scraper roller (34) disposed on a side of the detection probe (36) away from the U-shaped integrated magnetizer (32) for performing magnetic powder cleaning on the surface of the pressure vessel that has left the magnetization area; The magnetic particle detection unit (3) further comprises: A detection box (31) is fixedly connected to the end of the lifting arm (23), the upper end of the detection box (31) can be attached to the inner wall of the pressure container, and the U-shaped integrated magnetizer (32) is fixedly arranged in the middle of the detection box (31); a power contact rubber roller (35) rotatably disposed inside the detection box (31) and having one side extending upward to the outside of the detection box (31); the power contact rubber roller (35) is transmission-connected to the scraper roller (34); A magnetic powder hopper (38) is fixedly disposed in the detection box (31) and is used to add magnetic powder to the magnetic powder coating member (33); A receiving hopper (310) is fixedly arranged below the scraping roller (34), and its bottom end is located above the end of the magnetic powder smearing member (33), and is used for magnetic powder recovery; The magnetic powder coating member (33) comprises: Two sets of drive chains (331), the front ends of which are bent upward and extended into an L shape; A flexible magnetic tape (332) is fixedly disposed between the two sets of drive chains (331); An elastic support member (333) is arranged inside the upwardly bent portion of the flexible magnetic tape (332); A passive roller (334) rotatably connected to the top of the detection box (31); A driving roller (335) is rotatably disposed on the bottom of the detection box (31); The two sets of drive chains (331) are installed between the passive roller (334) and the driving roller (335); The magnetic powder silo (38) is located below the front end of the flexible magnetic tape (332). A powder transfer roller (382) is rotatably provided inside the magnetic powder silo (38). A second transmission chain (314) is installed between the powder transfer roller (382) and the driving roller (335). A first transmission chain (313) is installed between the scraping roller (34) and the driving roller (335).

2. The boiler pressure vessel inner surface crack detection device according to claim 1, characterized in that: The driving unit (1) further comprises: A base plate (11), two groups of support rails (12) are fixedly arranged on both sides of the base plate (11), and the support unit (2) is installed on the base plate (11); A running ball (13) is rotatably arranged on the top of the support track (12); The driving screw (15) is fixedly arranged above the base plate (11), and the rotary driving member (14) moves along the driving screw (15).

3. The boiler pressure vessel inner surface crack detection device according to claim 2, characterized in that: The rotary drive member (14) comprises: A traveling seat (141) is movably sleeved on the outer surface of the driving screw (15); A driving gear (142) is rotatably mounted on the top of the traveling seat (141); A travel motor (143) is fixedly arranged on one side of the travel seat (141), and its output end is fixedly connected to the driving gear (142); An inner rotating roller (144) is rotatably disposed on the top of the other side of the traveling seat (141) and is fixedly connected to the driving gear (142); Two sets of passive gear rings (145) are rotatably arranged on both sides of the bottom of the traveling seat (141) and are respectively engaged with the driving gear (142); Two sets of outer rollers (146) are rotatably arranged on both sides below the inner roller (144) and are fixedly connected to the two sets of passive gear rings (145) respectively. The outer rollers (146) are threadedly connected to the outer surface of the driving screw (15).

4. The boiler pressure vessel inner surface crack detection device according to claim 3, characterized in that: The support unit (2) comprises: A support seat (21) is fixedly mounted on the upper surface of the base plate (11); A lifting arm (23) is slidably arranged on one side of the support base (21); A lifting drive motor (24) is fixedly mounted on the top of the support base (21) and is in transmission connection with the lifting arm (23); An auxiliary support frame (29) is rotatably arranged at the bottom of the front end of the lifting arm (23); A tilting hydraulic cylinder (28), both ends of which are hinged to the outer surfaces of the lifting arm (23) and the auxiliary support frame (29); The supporting ball (210) is rotatably arranged at the bottom end of the auxiliary support frame (29).

5. The boiler pressure vessel inner surface crack detection device according to claim 4, characterized in that: A slider (22) is fixedly provided at the end of the lifting arm (23), and a side pull link (27) is fixedly welded between the top end of the slider (22) and the lifting arm (23). A lifting screw (211) is rotatably provided in the support seat (21), and the slider (22) is threadedly connected to the outer surface of the lifting screw (211). The top end of the lifting screw (211) is fixedly connected to the lifting drive motor (24). A positioning strip (25) is fixedly provided on the inner wall of the support seat (21), and a slide groove (26) is provided on the side of the slider (22), and the positioning strip (25) is provided through the slide groove (26).

6. The boiler pressure vessel inner surface crack detection device according to claim 5, characterized in that: Transmission gears (312) are installed at both ends of the power contact rubber roller (35) and the scraper roller (34), and the two sets of transmission gears (312) are meshed with each other.

7. The boiler pressure vessel inner surface crack detection device according to claim 6, characterized in that: A partition plate (39) is provided between the upper end of the flexible magnetic tape (332) and the detection probe (36), ultraviolet lamps (37) are provided on both sides of the detection probe (36), and a transparent cover (311) is provided on the top of the detection probe (36) and the ultraviolet lamp (37), with one side of the top of the transparent cover (311) being inclined toward the receiving hopper (310).

8. The method for detecting cracks on the inner surface of a boiler pressure vessel according to claim 7, characterized in that: The following steps are involved: Step 1: Loading, pushing the cylindrical member inward along the support track (12) so that the front end of the cylindrical member is inserted between the inner rotating roller (144) and the two sets of outer rotating rollers (146); Step 2: The magnetic powder detection unit (3) is in place, and the lifting drive motor (24) is started to move the detection box (31) upward to contact the inner top of the cylindrical member. The turning hydraulic cylinder (28) is started to turn the bottom end of the auxiliary support frame (29) downward, and the supporting ball (210) contacts the inner bottom of the cylindrical member; Step 3: Continuous detection: Start the travel motor (143) and the U-shaped integrated magnetizer (32), so that the cylindrical member moves spirally, causing the power contact rubber roller (35) to passively rotate, and at the same time, a magnetized area is formed on the surface of the cylindrical member, so that the magnetic powder coating member (33) automatically coats the magnetic powder, the powder transfer roller (382) coats the magnetic powder on the magnetic powder coating member (33), the detection probe (36) detects the coating area, and the scraper roller (34) cleans and recovers the detected magnetic powder to the magnetic powder coating member (33).

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