Device and method for detecting cracks on inner surface of boiler pressure vessel

Abstract

The invention discloses a boiler pressure vessel inner surface crack detection device and method, and relates to the field of crack detection, and the boiler pressure vessel inner surface crack detection device comprises a driving unit, a supporting unit and a magnetic powder detection unit. According to the boiler pressure vessel inner surface crack detection device and method, the magnetic powder detection unit is fixedly supported through the supporting unit, and the cylindrical part is driven to spirally move through the driving unit, so that the inner wall of the cylindrical part is annularly and continuously detected; the magnetic powder smearing piece is automatically driven to smear magnetic powder to the inner wall of the cylindrical piece, meanwhile, the scraping roller automatically scrapes and recovers the magnetic powder in the detected area, the magnetic powder smearing process is more stable and uniform, equipment is more stable in the detection process, meanwhile, the magnetic powder recovery rate is higher after detection, the design is simple, the number of power sources is small, and the equipment cost and the control cost are reduced.

Description

Technical Field

[0001] The 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 flaw detector is usually used for inspection. Magnetic powder is applied to the inspection area and then the area is magnetized using the magnetic particle flaw 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 inspection.

[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 to support the pressure vessel to be detected, and 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 a clever 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 the detection results and harm to the health of the 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: First, the device uses a driving member to drive the container to rotate, and another driving member to drive the container detection unit to move linearly, thereby achieving complete detection of the inner wall of the container. However, in actual application, the container and the container detection unit are both in a moving state, resulting in a large overall shaking, which makes the magnetic powder easy to vibrate and fall off, affecting the detection effect; Second, the device uses spraying and suction to attach the magnetic powder to the surface of the container. During the spraying process, a large airflow will be generated, making the magnetic powder 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.

[0006] In order to solve the above problems, a boiler pressure vessel inner surface crack detection device and method are provided. Summary of the invention

[0007] In view of the shortcomings of the prior art, the present invention provides a boiler pressure vessel inner surface crack detection device and method, which solves the problems in the prior art of pressure vessel inner surface crack detection, such as inaccurate detection results caused by unreasonable design and difficulty in magnetic powder application and recovery.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: A boiler pressure vessel inner surface crack detection device, comprising: a driving unit, which includes two sets of support rails; A rotary drive member, which is used to drive the container to rotate and simultaneously move linearly along two sets of support rails; A support unit, which is arranged at one end of the support track; A magnetic particle detection unit is installed at the end of the support unit, and the magnetic particle detection unit includes a U-shaped integrated magnetizer, and a magnetization area is formed between the two ends of the magnetic particle detection unit for the inner wall of the pressure vessel; A magnetic powder coating member is installed below the U-shaped integrated magnetizer, and the upper end of the magnetic powder coating member is in contact with one side of the magnetized area, and is used for coating magnetic powder; A detection probe, which is installed on one side of the U-shaped integrated magnetizer and is used to detect the other side of the magnetized area; The scraper roller is arranged on the side of the detection probe away from the U-shaped integrated magnetizer to perform magnetic powder cleaning on the surface of the pressure vessel leaving the magnetization area.

[0009] Preferably, the driving unit further comprises a bottom plate, the two groups of the supporting rails are fixedly arranged on both sides of the bottom plate, and the supporting unit is mounted on the bottom plate; A running ball, which is rotatably arranged on the top of the support track; The driving screw rod is fixedly arranged above the bottom plate, and the rotating driving member moves along the driving screw rod.

[0010] Preferably, the rotary drive member comprises a travel seat, which is movably sleeved on the outer surface of the drive screw; A driving gear, which is rotatably arranged on the top of the traveling seat; A travel motor, which is fixedly arranged on one side of the travel seat, and an output end of which is fixedly connected to a driving gear; 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; Two sets of passive gear rings are arranged on both sides of the bottom of the traveling seat and mesh with the driving gears respectively; Two groups of outer rotating rollers are rotatably arranged on both sides below the inner rotating roller and are respectively fixedly connected to the two groups of passive gear rings. The outer rotating rollers are threadedly connected to the outer surface of the driving screw.

[0011] Preferably, the support unit comprises a support seat, which is fixedly mounted on the upper surface of the base plate; A lifting arm is slidably disposed on one side of the support seat, and the magnetic particle detection unit is fixedly disposed on the end of the lifting arm; A lifting drive motor is fixedly arranged on the top of the support base and is drivingly connected to the lifting arm; An auxiliary support frame is rotatably arranged at the bottom of the front end of the lifting arm; A tilting hydraulic cylinder, both ends of which are respectively hinged to the outer surfaces of the lifting arm and the auxiliary support frame; The supporting ball is rotatably arranged at the bottom end of the auxiliary support frame.

[0012] Preferably, a slider is fixedly provided at the end of the lifting arm, a side pull connecting rod is fixedly welded between the top 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 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 opened on the side of the slider, and the positioning strip is penetrated through the slide groove.

[0013] 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; A power contact rubber roller is rotatably disposed inside the detection box, and one side of the power contact rubber roller extends upward to the outside of the detection box, and the power contact rubber roller is drivingly connected to the scraper roller; A magnetic powder silo, which is fixedly arranged in the detection box and is used to add magnetic powder to the magnetic powder coating part; The receiving hopper is fixedly arranged below the scraping roller, and its bottom end is located above the end of the magnetic powder coating member, and is used for magnetic powder recovery.

[0014] Preferably, the magnetic powder coating member comprises two sets of drive chains, the front ends of which are bent upward and extended into an L shape; A flexible magnetic tape fixedly disposed between two sets of drive chains; An elastic support member, which is arranged inside the upward bending portion of the flexible magnetic tape; A passive roller, which is rotatably connected to the top of the detection box; A driving roller, which is rotatably arranged at the bottom of the detection box; The two sets of driving chains are installed between the passive roller and the driving roller.

[0015] Preferably, the magnetic powder silo is located below the front end of the flexible magnetic tape, 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 driving roller, 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, and a first transmission chain is installed between the scraper roller and the driving roller.

[0016] 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.

[0017] Preferably, a method for detecting cracks on the inner surface of a boiler pressure vessel comprises the following steps: 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; Step 2: The magnetic particle detection unit is in place, and the lifting drive motor is started to move the detection box upward to contact the inner top of the cylindrical member. The turning hydraulic cylinder is started to turn the bottom end of the auxiliary support frame downward, and the supporting ball contacts the inner bottom of the cylindrical member; 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.

[0018] The present invention discloses a boiler pressure vessel inner surface crack detection device and method thereof, which have the following beneficial effects: 1. The boiler pressure vessel inner surface crack detection device, as the cylindrical part moves spirally, passively drives the magnetic powder coating part inside the magnetic powder detection unit to smear magnetic powder on the inner wall of the cylindrical part. At the same time, the scraper roller automatically scrapes and recovers the magnetic powder in the area after the inspection. The recovered magnetic powder immediately enters the magnetic powder coating part 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 result more accurate.

[0019] 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 roller and the outer roller, the cylindrical member rotates counterclockwise, and 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 travel ball on the support track through the travel seat to move away from the support seat. At this time, the cylindrical member moves in a spiral. During the process, the detection box always remains motionless, so as to maintain stability during the detection process and improve detection accuracy.

[0020] 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 bin on the surface of the flexible magnetic tape, and uses the magnetic adsorption of the flexible magnetic tape. Then, when the flexible magnetic tape moves up, the excess magnetic powder will fall back to the inside of the magnetic powder bin under the action of gravity, and 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 part, and adjusts the magnetic force so that its magnetism is greater than the magnetic force of the flexible magnetic tape. At this time, 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 part to realize automatic loading, and the smearing method is adopted to effectively avoid the magnetic powder from falling during loading.

[0021] 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, so as to ensure that the upper end of the detection box can fit 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 detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0023] Figure 1 It is a schematic diagram of the overall outer surface structure of the present invention.

[0024] Figure 2 It is a sectional view of the overall side structure of the present invention.

[0025] Figure 3It is a schematic diagram of the support unit structure of the present invention.

[0026] Figure 4 It is a schematic diagram of the structure of the driving unit of the present invention.

[0027] Figure 5 It is a schematic diagram of the structure of the rotary drive member of the present invention.

[0028] Figure 6 It is a schematic diagram of the outer surface structure of the magnetic powder detection unit of the present invention.

[0029] Figure 7 It is a side structural sectional view of the detection box of the present invention.

[0030] Figure 8 It is a cross-sectional view of the internal structure of the detection box of the present invention.

[0031] Fig. 9 It is a schematic diagram of the structure of the magnetic powder coating member of the present invention.

[0032] In the figure: 1, driving unit; 11, bottom plate; 12, support rail; 13, walking ball; 14, rotating driving member; 15, driving screw; 141, travel seat; 142, driving gear; 143, travel motor; 144, inner roller; 145, passive gear ring; 146, outer roller; 2. Support unit; 21. Support seat; 22. Sliding block; 23. Lifting arm; 24. Lifting drive motor; 25. Positioning bar; 26. Sliding slot; 27. Side pull connecting rod; 28. Flip hydraulic cylinder; 29. ​​Auxiliary support frame; 210. Support ball; 211. Lifting screw rod; 3. Magnetic powder detection unit; 31. Detection box; 32. U-shaped integrated magnetizer; 33. Magnetic powder coating member; 34. Scraper roller; 35. Power contact rubber roller; 36. Detection probe; 37. Ultraviolet lamp; 38. Magnetic powder silo; 382. Powder transfer roller; 39. Separation plate; 310. Receiver hopper; 311. Transparent cover; 312. Transmission gear; 313. First transmission chain; 314. Second transmission chain; 331. Drive chain; 332. Flexible magnetic tape; 333. Elastic support member; 334. Passive roller; 335. Drive roller. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] 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.

[0035] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] The embodiment of the invention discloses a device and method for detecting cracks on the inner surface of a boiler pressure vessel.

[0037] 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, wherein the driving unit 1 includes a base plate 11, two groups of supporting rails 12, a traveling ball 13, a rotating driving member 14 and a driving screw 15, wherein 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 rail 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 traveling ball 13 is rotatably arranged on the top of the supporting rail 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.

[0038] The rotating drive member 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 inner 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; two sets of passive gear rings 145 are rotatably arranged on both sides of the inner bottom of the traveling seat 141, and are respectively meshed with the driving gear 142; 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.

[0039] 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 under 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.

[0040] The support unit 2 includes a support seat 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 seat 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 seat 21, and the magnetic powder 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 seat 21, and is transmission-connected with the lifting arm 23; the auxiliary support frame 29 is rotatably arranged at the bottom of the 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.

[0041] A slider 22 is fixedly provided at the end of the lifting arm 23, and a side pull connecting rod 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. The slider 22 is threadedly connected to the outer surface of the lifting screw rod 211, and the top of the lifting screw rod 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 opened on the side of the slider 22, and the positioning strip 25 is penetrated through the slide groove 26.

[0042] 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 arranged in the middle of the detection box 31; the power contact rubber roller 35 is rotatably arranged 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 arranged in the detection box 31, and is used to add magnetic powder to the magnetic powder coating member 33, and the receiving hopper 310 is fixedly arranged below the scraper roller 34, and its bottom end is located above the end of the magnetic powder coating member 33, and is used for magnetic powder recovery.

[0043] The magnetic powder coating member 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 bending 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.

[0044] The magnetic powder silo 38 is located below the front end of the flexible magnetic tape 332. A powder transfer roller 382 is rotatably arranged 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 arranged between the upper end of the flexible magnetic tape 332 and the detection probe 36. Ultraviolet lamps 37 are arranged on both sides of the detection probe 36. A transparent cover 311 is arranged on the top of the detection probe 36 and the ultraviolet lamp 37. One side of the top of the transparent cover 311 is inclined toward the receiving hopper 310.

[0045] Working principle: When the device is in use, the cylindrical member is pushed 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. 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 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, so as to ensure that the upper end of the detection box 31 can fit the inner wall of the cylindrical member. 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, and 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, and 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 to move along the travel ball 13 on the support track 12 through the travel seat 141 toward the end away from the support seat 21. At this time, the cylindrical member moves in a spiral manner; 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 the two sets of transmission gears 312. The scraper roller 34 drives the drive roller 335 to rotate clockwise through the first transmission chain 313. The drive roller 335 drives the powder transfer roller 382 to rotate clockwise through the second transmission chain 314, so that during the rotation of the cylindrical member, the flexible magnetic tape 332 automatically moves in a circular motion. 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 bin 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, and the magnetic force is adjusted to make its magnetism 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 state of the magnetic powder, and the crack situation in the area is judged according to the picture; 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 at the same time, the magnetic powder 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, so as to scrape off the magnetic powder on the inner wall, so that the magnetic powder falls into the receiving hopper 310, and then falls from the bottom of the receiving hopper 310 to the flexible magnetic tape 332, completing the recycling of the magnetic powder. 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. The entire device only relies on the travel motor 143 as the power part. Through the cooperation of the travel motor 143 and the rotating drive part 14, the cylindrical part moves in a spiral shape along the support track 12. In this process, the magnetic powder detection unit 3 always remains stationary and is more stable. At the same time, as the cylindrical part moves in a spiral shape, the magnetic powder coating part 33 inside the magnetic powder detection unit 3 is passively driven to coat the magnetic powder on the inner wall of the cylindrical part. At the same time, the scraper roller 34 automatically scrapes and recovers the magnetic powder in the area after the inspection. The recovered magnetic powder immediately enters the magnetic powder coating part 33 for recycling. There is no need to use additional wind drive. The magnetic powder coating and cleaning process is more stable and reliable. The magnetic powder loading and unloading process will not affect the inspection area, making the inspection result more accurate.

[0046] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A boiler pressure vessel inner surface crack detection device, characterized in that: include: A drive unit (1) comprising two sets of support rails (12); A rotary drive member (14) for driving the container to rotate and simultaneously to move linearly along the two sets of support rails (12); A support unit (2) disposed at one end of the support track (12); A magnetic powder detection unit (3) is installed at an end of the support unit (2), the magnetic powder detection unit (3) comprising a U-shaped integrated magnetizer (32), a magnetization area formed between the two ends of the magnetic powder detection unit for 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) installed on one side of the U-shaped integrated magnetizer (32) and used to detect the other side of the magnetized area; A scraper roller (34) is arranged on a side of the detection probe (36) away from the U-shaped integrated magnetizer (32) and performs magnetic powder cleaning on the surface of the pressure vessel that leaves the magnetization area.

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

3. A boiler pressure vessel inner surface crack detection device according to claim 2, characterized in that: The rotary drive member (14) comprises a travel seat (141) which is movably sleeved on the outer surface of the drive screw rod (15); A driving gear (142) rotatably disposed on the top of the traveling seat (141); A travel motor (143), which is fixedly arranged on one side of the travel seat (141), and whose 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 meshed with the driving gear (142); Two groups 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 groups of passive gear rings (145). The outer rotating 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 2, characterized in that: The support unit (2) comprises a support seat (21) which 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 seat (21), and the magnetic powder detection unit (3) is fixedly arranged on an end of the lifting arm (23); A lifting drive motor (24), which is fixedly arranged on the top of the support base (21) and is drivingly connected to the lifting support arm (23); An auxiliary support frame (29) rotatably disposed at the bottom of the front end of the lifting arm (23); A tilting hydraulic cylinder (28), both ends of which are respectively hinged to the outer surfaces of the lifting arm (23) and the auxiliary support frame (29); The supporting ball (210) is rotatably disposed at the bottom end of the auxiliary support frame (29).

5. A 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), a side pull connecting rod (27) is fixedly welded between the top end of the slider (22) and the lifting arm (23), a lifting screw rod (211) is rotatably provided in the support seat (21), the slider (22) is threadedly connected to the outer surface of the lifting screw rod (211), the top end of the lifting screw rod (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), a slide groove (26) is provided on the side of the slider (22), and the positioning strip (25) is penetrated and provided in the slide groove (26).

6. A boiler pressure vessel inner surface crack detection device according to claim 4, characterized in that: The magnetic powder detection unit (3) further comprises a detection box (31) which is fixedly connected to the end of the lifting arm (23); the U-shaped integrated magnetizer (32) is fixedly arranged in the middle of the detection box (31); a power contact rubber roller (35) which is rotatably disposed inside the detection box (31) and has one side extending upward to the outside of the detection box (31); the power contact rubber roller (35) is drivingly connected to the scraper roller (34); A magnetic powder silo (38) fixedly disposed in the detection box (31) and used for adding magnetic powder to the magnetic powder coating member (33); The 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 recovering magnetic powder.

7. A boiler pressure vessel inner surface crack detection device according to claim 6, characterized in that: 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) fixedly disposed between 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) rotatably disposed at the bottom of the detection box (31); The two sets of drive chains (331) are installed between the passive roller (334) and the drive roller (335).

8. The boiler pressure vessel inner surface crack detection device according to claim 7, characterized in that: The magnetic powder bin (38) is located below the front end of the flexible magnetic tape (332); a powder transfer roller (382) is rotatably arranged inside the magnetic powder bin (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; and a first transmission chain (313) is installed between the scraper roller (34) and the driving roller (335).

9. The boiler pressure vessel inner surface crack detection device according to claim 7, 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), and one side of the top of the transparent cover (311) is inclined toward the receiving hopper (310).

10. The method for detecting cracks on the inner surface of a boiler pressure vessel according to claim 1, characterized in that: The following steps are involved: Step 1: Loading: Push 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, and the turning hydraulic cylinder (28) is started to turn the bottom end of the auxiliary support frame (29) downward, so that the support 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 forming a magnetized area 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 the detected magnetic powder and recovers it to the magnetic powder coating member (33).

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