A nondestructive testing device for pressure vessel welds

Abstract

The present invention discloses a nondestructive testing device for pressure vessel welds, which belongs to the technical field of pressure vessel testing, and comprises a pressure vessel, a support plate, a clamping device, an external fixing device, a testing device and a clamping device. The outer wall of the pressure vessel is provided with a support plate, the top of the support plate is provided with a clamping device, and the bottom of the support plate is provided with an external fixing device. The testing device is provided on the external fixing device, and the clamping device is installed on the outer wall of the testing device. The present invention can stably make the testing device perform circular motion by means of the external fixing device, thereby realizing 360-degree nondestructive testing of the outer surface of the pressure vessel.

Description

Technical Field

[0001] The invention relates to the technical field of pressure vessel detection, and in particular to a nondestructive detection device for pressure vessel welds. Background Art

[0002] Nondestructive testing is the general term for all technical means to detect whether there are defects or unevenness in the inspected object by using the characteristics of sound, light, magnetism and electricity without damaging or affecting the performance of the inspected object, and to provide information such as the size, location, nature and quantity of the defects, so as to determine the technical status of the inspected object (such as whether it is qualified or not, remaining life, etc.). The patent with application number CN201822059595.4 discloses an X-ray DR imaging detection system for detecting the straight weld of a pressure vessel, including a gantry positioner, a detection conveyor line for transporting pressure vessels arranged under the gantry positioner, a conveyor line detection section installed on the detection conveyor line for lifting the pressure vessel away from the detection conveyor line for flipping, a ray machine and an imaging plate installed on the upper operating surface of the gantry positioner, a driving device capable of driving the ray machine and the imaging plate to move up and down, pitch, adjust the focal length forward and backward, and move horizontally, and a multi-viewing angle multi-functional monitoring device and a control and film evaluation device connected to the ray machine and the imaging plate. The advantages of this device are improved imaging quality, improved detection efficiency, and reduced labor; the disadvantages are that it can only achieve online fully automatic dynamic and static imaging detection of the double-wall single-image digital dynamic and static quality of the straight weld of pressure cylinders with a diameter of 0.5 to 1.2 m, but cannot realize automated detection of various pressure vessels. Therefore, the above problems need to be solved. Summary of the invention

[0003] In response to the above technical problems, the technical solution adopted by the present invention is: a non-destructive testing device for pressure vessel welds, the outer wall of the pressure vessel is provided with a support plate, the top of the support plate is installed with a clamping device, and the bottom of the support plate is installed with an external fixing device, the external fixing device is provided with a testing device, and the outer wall of the testing device is installed with a clamping device.

[0004] The detection device includes a support plate arranged on an external fixing device, and a spraying device for spraying fluorescent dye or coloring dye during detection is installed on the top of the support plate. A coating device for applying a developer is also installed on the top of the support plate, and the movement trajectory of the support plate is a circular motion with the pressure vessel as the axis.

[0005] Further, the clamping device includes a first motor installed on the top of the support plate, a first gear is installed on the output end of the first motor, a second gear and a third gear are symmetrically installed on both ends of the top of the support plate, a first connecting rod and a second connecting rod are slidably installed on the outer walls of both sides of the external fixing device, a first rack is installed on one end of the first connecting rod, a second rack is installed on one end of the second connecting rod, a first clamping block is hinged on the other end of the first rack, and a second clamping block is hinged on the other end of the second rack;

[0006] The first gear is meshed with the second gear, the second gear is meshed with the second rack, and the third gear is meshed with the first rack.

[0007] Further, a second motor is installed at the bottom of the support plate, a fourth gear is installed at the output end of the second motor, a first semicircular plate and a second semicircular plate are symmetrically installed at the bottom of the support plate, a sixth gear is installed at the bottom of the first semicircular plate, and a fifth gear is installed at the bottom of the second semicircular plate;

[0008] The fourth gear is meshed with the fifth gear, the fifth gear is meshed with the sixth gear, and the fifth gear is meshed with the sixth gear.

[0009] Furthermore, the detection device includes a support plate arranged on an external fixing device, a third motor is installed on the top of the support plate, a seventh gear is installed on the output end of the third motor, an electric push rod is installed on the top of the support plate, a cleaning block is installed on the output end of the electric push rod, and a smearing device is installed on the top of the support plate.

[0010] Furthermore, a first fixed block and a second fixed block are respectively installed on the outer wall of the first semicircular plate, a first rotating rod is rotatably installed on the top of the first fixed block, an eighth gear is installed on the bottom of the outer surface of the first rotating rod, a first spring is sleeved on the top of the outer surface of the first rotating rod, and a first shifting rod is installed on the top of the first rotating rod.

[0011] A second rotating rod is rotatably installed on the top of the second fixed block, a ninth gear is installed on the bottom of the outer surface of the second rotating rod, a second spring is sleeved on the top of the outer surface of the second rotating rod, a second shifting rod is installed on the top of the second rotating rod, and the ninth gear is meshed with the eighth gear.

[0012] Furthermore, teeth meshing with the seventh gear are formed on the inner surfaces of the first semicircular plate and the second semicircular plate.

[0013] Furthermore, a limiting block is installed on the outer wall of the first semicircular plate and the second semicircular plate, and a sliding hole having a size matching that of the first connecting rod and the second connecting rod and corresponding to that of the position is opened on the limiting block.

[0014] Furthermore, a sliding block is installed at the bottom of the support plate, and a sliding groove which is adapted to the size and has a corresponding position to the sliding block on the support plate is opened at the top of the first semicircular plate and the second semicircular plate.

[0015] Compared with the prior art, the present invention has the following advantages: (1) the present invention adopts a mechanical design and can perform non-destructive inspection on pressure vessels of different sizes; (2) the present invention can smoothly make the inspection device move in a circular motion by means of an external fixing device, thereby realizing 360-degree non-destructive inspection on the outer surface of the pressure vessel; (3) the present invention can realize contactless automatic inspection, which greatly improves the safety of the equipment and also reduces the labor intensity of manual labor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of the clamping device of the present invention.

[0018] Figure 3 It is a schematic diagram of the structure of the external fixing device of the present invention.

[0019] Figure 4 It is a schematic diagram of the connection structure between the clamping device and the external fixing device of the present invention.

[0020] Figure 5 It is a schematic diagram of the structure of the detection device of the present invention.

[0021] Figure 6 For the present invention Figure 5 Enlarged structural diagram at A in the middle.

[0022] In the figure: 1, pressure vessel; 2, support plate; 3, clamping device; 4, external fixing device; 5, detection device; 6, clamping device; 301, first motor; 302, first gear; 303, second gear; 304, third gear; 305, first rack; 306, first connecting rod; 307, first clamping block; 308, second rack; 309, second connecting rod; 310, second clamping block; 401, second motor; 402, fourth gear; 403, fifth gear; 404, sixth gear; 4 05, first semicircular plate; 406, second semicircular plate; 501, support plate; 502, third motor; 503, seventh gear; 504, spraying device; 505, coating device; 506, electric push rod; 507, cleaning block; 601, first fixed block; 602, first rotating rod; 603, eighth gear; 604, first spring; 605, first lever; 606, second fixed block; 607, second rotating rod; 608, ninth gear; 609, second spring; 610, second lever. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0024] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0025] Example: Figure 1-Figure 6 A nondestructive testing device for a pressure vessel weld is shown, wherein a support plate 2 is provided on the outer wall of the pressure vessel 1, a clamping device 3 is installed on the top of the support plate 2, and an external fixing device 4 is installed on the bottom of the support plate 2, a detection device 5 is provided on the external fixing device 4, and a clamping device 6 is installed on the outer wall of the detection device 5.

[0026] The detection device 5 includes a support plate 501 arranged on the external fixing device 4, and a spraying device 504 for spraying fluorescent dye or coloring dye during detection is installed on the top of the support plate 501. A coating device 505 for applying a developer is also installed on the top of the support plate 501, and the movement trajectory of the support plate 501 is a circular motion with the pressure vessel 1 as the axis.

[0027] By starting the detection device 5, the detection device 5 makes a circular motion with the pressure vessel 1 as the axis, and then the weld on the pressure vessel 1 is detected. During the detection process, it is clamped by the clamping device 3. Further, pressure vessels 1 of different sizes can also be detected.

[0028] The clamping device 3 includes a first motor 301 installed on the top of the support plate 2, a first gear 302 is installed at the output end of the first motor 301, a second gear 303 and a third gear 304 are symmetrically installed at both ends of the top of the support plate 2, a first connecting rod 306 and a second connecting rod 309 are slidably installed on the outer walls of both sides of the external fixing device 4, a first rack 305 is installed at one end of the first connecting rod 306, a second rack 308 is installed at one end of the second connecting rod 309, a first clamping block 307 is hinged at the other end of the first rack 305, and a second clamping block 310 is hinged at the other end of the second rack 308, the first gear 302 and the second gear 303 are meshed with each other, the second gear 303 and the second rack 308 are meshed with each other, and the third gear 304 is meshed with the first rack 305.

[0029] By starting the first motor 301, the first motor 301 drives the first gear 302 to rotate. Since the first gear 302 and the second gear 303 are meshed, and the second gear 303 and the third gear 304 are meshed, the first gear 302 will drive the second gear 303 to rotate during its rotation, and the second gear 303 will drive the third gear 304 to rotate during its rotation. The second gear 303 is meshed with the second rack 308, and the third gear 304 is meshed with the first rack 305. When the second gear 303 rotates, the second rack 308 will slide, and the second rack 308 will drive the second connecting rod 309 to move. During the movement of the second connecting rod 309, the second clamping block 310 is driven to clamp the pressure vessel 1. During the rotation of the third gear 304, the first rack 305 will slide, and when the first rack 305 slides, the first connecting rod 306 is driven to move, and when the first connecting rod 306 moves, the first clamping block 307 is driven to clamp the pressure vessel 1.

[0030] A second motor 401 is installed at the bottom of the support plate 2, and a fourth gear 402 is installed at the output end of the second motor 401. A first semicircular plate 405 and a second semicircular plate 406 are symmetrically installed at the bottom of the support plate 2 for rotation. A sixth gear 404 is installed at the bottom of the first semicircular plate 405, and a fifth gear 403 is installed at the bottom of the second semicircular plate 406. Limit blocks are installed on the outer walls of the first semicircular plate 405 and the second semicircular plate 406, and sliding holes with sizes matching the first connecting rod 306 and the second connecting rod 309 and corresponding positions are opened on the limit blocks. The fourth gear 402 is meshed with the fifth gear 403, the fifth gear 403 is meshed with the sixth gear 404, and the fifth gear 403 is meshed with the sixth gear 404.

[0031] By starting the second motor 401, the second motor 401 drives the fourth gear 402. Since the fourth gear 402 and the fifth gear 403 are meshed, and the fifth gear 403 and the sixth gear 404 are meshed, when the fourth gear 402 rotates, it will drive the fifth gear 403 to rotate, and when the fifth gear 403 rotates, it will drive the sixth gear 404 to rotate. When the fifth gear 403 rotates, it will drive the first semicircular plate 405 to rotate, and when the sixth gear 404 rotates, it will drive the second semicircular plate 406 to rotate, thereby controlling the expansion and closing of the first semicircular plate 405 and the second semicircular plate 406.

[0032] The detection device 5 includes a support plate 501 arranged on the external fixing device 4, a third motor 502 is installed on the top of the support plate 501, a seventh gear 503 is installed on the output end of the third motor 502, an electric push rod 506 is installed on the top of the support plate 501, a cleaning block 507 is arranged on the output end of the electric push rod 506, a smearing device 505 is installed on the top of the support plate 501, a slider is installed on the bottom of the support plate 501, the tops of the first semicircular plate 405 and the second semicircular plate 406 are provided with sliding grooves that are adapted to the size and corresponding to the position of the slider on the support plate 501, and the inner surfaces of the first semicircular plate 405 and the second semicircular plate 406 are provided with teeth that mesh with the seventh gear 503.

[0033] By starting the third motor 502, the third motor 502 drives the seventh gear 503 to rotate. Since the first semicircular plate 405 and the second semicircular plate 406 are provided with teeth meshing with the seventh gear 503, when the seventh gear 503 rotates, it will drive the support plate 501 to make a circular motion with the pressure vessel 1 as the center. At the same time, a lamp tube is installed on the inner wall of the first semicircular plate 405 and the second semicircular plate 406. The outer surface of the pressure vessel 1 is sprayed with fluorescent dye or coloring dye through the spraying device 504. Under the capillary action for a period of time, the penetrant can penetrate into the pressure vessel. The developer is applied to the surface of the pressure vessel 1 by using the coating device 505 after removing the excess penetrant from the surface of the part. Similarly, under the action of the capillary, the developer will attract the penetrant retained in the defect, and the penetrant will seep back into the developer. Under a certain light source (ultraviolet light or white light), the traces of the penetrant at the defect will be displayed (yellow-green fluorescence or bright red), thereby detecting the morphology and distribution of the defect. After the detection is completed, the electric push rod 506 is started, and the electric push rod 506 drives the cleaning block 507 to contact the outer surface of the pressure vessel 1 for cleaning.

[0034] The first fixed block 601 and the second fixed block 606 are respectively installed on the outer wall of the first semicircular plate 405, the first fixed block 601 is rotatably installed on the top of the first fixed block 601, the eighth gear 603 is installed at the bottom of the outer surface of the first rotating rod 602, the top of the outer surface of the first rotating rod 602 is sleeved with a first spring 604, and the top of the first rotating rod 602 is installed with a first lever 605; the second fixed block 606 is rotatably installed on the top, the bottom of the outer surface of the second rotating rod 607 is installed with a ninth gear 608, the top of the outer surface of the second rotating rod 607 is sleeved with a second spring 609, the top of the outer surface of the second rotating rod 607 is installed with a second lever 610, and the ninth gear 608 and the eighth gear 603 are meshed.

[0035] When the support plate 501 moves in a circle, it will drive the second lever 610 to rotate. During the rotation of the second lever 610, it will drive the second rotating rod 607 to rotate. During the rotation of the second rotating rod 607, it will drive the ninth gear 608 to rotate. The ninth gear 608 is meshed with the eighth gear 603, so when the ninth gear 608 rotates, it will drive the eighth gear 603 to rotate. During the rotation of the eighth gear 603, it will drive the first lever 605 to rotate. The second semicircular plate 406 is also provided with a slot that matches the size of the first lever 605 and corresponds to the position, so that the first lever 605 is stuck in the slot on the second semicircular plate 406, which greatly improves the stability of the device.

[0036] The working principle of a nondestructive testing device for pressure vessel welds disclosed in the present invention is as follows: by starting the testing device 5, the testing device 5 is caused to make circular motion with the pressure vessel 1 as the axis, and then the weld on the pressure vessel 1 is tested. During the testing process, the pressure vessel 1 is clamped by the clamping device 3. Furthermore, pressure vessels 1 of different sizes can also be tested.

Claims

1. A nondestructive testing device for pressure vessel welds, characterized in that: The outer wall of the pressure vessel (1) is provided with a support plate (2), the top of the support plate (2) is provided with a clamping device (3), and the bottom of the support plate (2) is provided with an external fixing device (4), the external fixing device (4) is provided with a detection device (5), and the outer wall of the detection device (5) is provided with a clamping device (6); the detection device (5) comprises a support plate (501) provided on the external fixing device (4), and the top of the support plate (501) is provided with a spraying device (504) for spraying fluorescent dye or coloring dye during detection, and the top of the support plate (501) is also provided with a smearing device (505) for applying a developer, and the movement trajectory of the support plate (501) is a circular motion with the pressure vessel (1) as the axis; The clamping device (3) comprises a first motor (301) installed on the top of the support plate (2), a first gear (302) is installed at the output end of the first motor (301), a second gear (303) and a third gear (304) are symmetrically installed at both ends of the top of the support plate (2), a first connecting rod (306) and a second connecting rod (309) are slidably installed on the outer walls of both sides of the external fixing device (4), a first rack (305) is installed at one end of the first connecting rod (306), a second rack (308) is installed at one end of the second connecting rod (309), a first clamping block (307) is hinged at the other end of the first rack (305), and a second clamping block (310) is hinged at the other end of the second rack (308); the first gear (302) and the second gear (303) are meshed, the second gear (303) and the second rack (308) are meshed, and the third gear (304) and the first rack (305) are meshed; A second motor (401) is installed at the bottom of the support plate (2); a fourth gear (402) is installed at the output end of the second motor (401); a first semicircular plate (405) and a second semicircular plate (406) are symmetrically installed at the bottom of the support plate (2); a sixth gear (404) is installed at the bottom of the first semicircular plate (405); and a fifth gear (403) is installed at the bottom of the second semicircular plate (406); the fourth gear (402) and the fifth gear (403) are meshed with each other, the fifth gear (403) and the sixth gear (404) are meshed with each other, and the fifth gear (403) and the sixth gear (404) are meshed with each other; The detection device (5) comprises a support plate (501) arranged on the external fixing device (4); a third motor (502) is installed on the top of the support plate (501); a seventh gear (503) is installed on the output end of the third motor (502); an electric push rod (506) is installed on the top of the support plate (501); a cleaning block (507) is installed on the output end of the electric push rod (506); and a smearing device (505) is installed on the top of the support plate (501); A first fixed block (601) and a second fixed block (606) are respectively mounted on the outer wall of the first semicircular plate (405); a first rotating rod (602) is rotatably mounted on the top of the first fixed block (601); an eighth gear (603) is mounted on the bottom of the outer surface of the first rotating rod (602); a first spring (604) is sleeved on the top of the outer surface of the first rotating rod (602); a first shifting rod (605) is mounted on the top of the first rotating rod (602); a second rotating rod (607) is rotatably mounted on the top of the second fixed block (606); a ninth gear (608) is mounted on the bottom of the outer surface of the second rotating rod (607); a second spring (609) is sleeved on the top of the outer surface of the second rotating rod (607); a second shifting rod (610) is mounted on the top of the second rotating rod (607); and the ninth gear (608) and the eighth gear (603) are meshed with each other.

2. A nondestructive testing device for pressure vessel welds according to claim 1, characterized in that: The inner surfaces of the first semicircular plate (405) and the second semicircular plate (406) are both provided with teeth meshing with the seventh gear (503).

3. The nondestructive testing device for pressure vessel welds according to claim 1, characterized in that: Limit blocks are installed on the outer walls of the first semicircular plate (405) and the second semicircular plate (406), and the limit blocks are provided with sliding holes that are matched in size and corresponding in position to the first connecting rod (306) and the second connecting rod (309).

4. The nondestructive testing device for pressure vessel welds according to claim 1, characterized in that: A sliding block is installed at the bottom of the support plate (501), and sliding grooves matching the size and corresponding in position to the sliding block on the support plate (501) are provided at the tops of the first semicircular plate (405) and the second semicircular plate (406).

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